Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2002 - 2005 NetGroup, Politecnico di Torino (Italy) |
| 3 | * Copyright (c) 2005 - 2008 CACE Technologies, Davis (California) |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. Neither the name of the Politecnico di Torino, CACE Technologies |
| 16 | * nor the names of its contributors may be used to endorse or promote |
| 17 | * products derived from this software without specific prior written |
| 18 | * permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | #ifdef HAVE_CONFIG_H |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 35 | #include <config.h> |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 36 | #endif |
| 37 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 38 | #include "ftmacros.h" |
| 39 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 40 | #include <string.h> /* for strlen(), ... */ |
| 41 | #include <stdlib.h> /* for malloc(), free(), ... */ |
| 42 | #include <stdarg.h> /* for functions with variable number of arguments */ |
| 43 | #include <errno.h> /* for the errno variable */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 44 | #include "sockutils.h" |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 45 | #include "pcap-int.h" |
| 46 | #include "rpcap-protocol.h" |
| 47 | #include "pcap-rpcap.h" |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 48 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 49 | #ifdef _WIN32 |
| 50 | #include "charconv.h" /* for utf_8_to_acp_truncated() */ |
| 51 | #endif |
| 52 | |
| 53 | #ifdef HAVE_OPENSSL |
| 54 | #include "sslutils.h" |
| 55 | #endif |
| 56 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 57 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 58 | * This file contains the pcap module for capturing from a remote machine's |
| 59 | * interfaces using the RPCAP protocol. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 60 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 61 | * WARNING: All the RPCAP functions that are allowed to return a buffer |
| 62 | * containing the error description can return max PCAP_ERRBUF_SIZE characters. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 63 | * However there is no guarantees that the string will be zero-terminated. |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 64 | * Best practice is to define the errbuf variable as a char of size |
| 65 | * 'PCAP_ERRBUF_SIZE+1' and to insert manually a NULL character at the end |
| 66 | * of the buffer. This will guarantee that no buffer overflows occur even |
| 67 | * if we use the printf() to show the error on the screen. |
| 68 | * |
| 69 | * XXX - actually, null-terminating the error string is part of the |
| 70 | * contract for the pcap API; if there's any place in the pcap code |
| 71 | * that doesn't guarantee null-termination, even at the expense of |
| 72 | * cutting the message short, that's a bug and needs to be fixed. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 73 | */ |
| 74 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 75 | #define PCAP_STATS_STANDARD 0 /* Used by pcap_stats_rpcap to see if we want standard or extended statistics */ |
| 76 | #ifdef _WIN32 |
| 77 | #define PCAP_STATS_EX 1 /* Used by pcap_stats_rpcap to see if we want standard or extended statistics */ |
| 78 | #endif |
| 79 | |
| 80 | /* |
| 81 | * \brief Keeps a list of all the opened connections in the active mode. |
| 82 | * |
| 83 | * This structure defines a linked list of items that are needed to keep the info required to |
| 84 | * manage the active mode. |
| 85 | * In other words, when a new connection in active mode starts, this structure is updated so that |
| 86 | * it reflects the list of active mode connections currently opened. |
| 87 | * This structure is required by findalldevs() and open_remote() to see if they have to open a new |
| 88 | * control connection toward the host, or they already have a control connection in place. |
| 89 | */ |
| 90 | struct activehosts |
| 91 | { |
| 92 | struct sockaddr_storage host; |
| 93 | SOCKET sockctrl; |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 94 | SSL *ssl; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 95 | uint8 protocol_version; |
| 96 | struct activehosts *next; |
| 97 | }; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 98 | |
| 99 | /* Keeps a list of all the opened connections in the active mode. */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 100 | static struct activehosts *activeHosts; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 101 | |
| 102 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 103 | * Keeps the main socket identifier when we want to accept a new remote |
| 104 | * connection (active mode only). |
| 105 | * See the documentation of pcap_remoteact_accept() and |
| 106 | * pcap_remoteact_cleanup() for more details. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 107 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 108 | static SOCKET sockmain; |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 109 | static SSL *ssl_main; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 110 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 111 | /* |
| 112 | * Private data for capturing remotely using the rpcap protocol. |
| 113 | */ |
| 114 | struct pcap_rpcap { |
| 115 | /* |
| 116 | * This is '1' if we're the network client; it is needed by several |
| 117 | * functions (such as pcap_setfilter()) to know whether they have |
| 118 | * to use the socket or have to open the local adapter. |
| 119 | */ |
| 120 | int rmt_clientside; |
| 121 | |
| 122 | SOCKET rmt_sockctrl; /* socket ID of the socket used for the control connection */ |
| 123 | SOCKET rmt_sockdata; /* socket ID of the socket used for the data connection */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 124 | SSL *ctrl_ssl, *data_ssl; /* optional transport of rmt_sockctrl and rmt_sockdata via TLS */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 125 | int rmt_flags; /* we have to save flags, since they are passed by the pcap_open_live(), but they are used by the pcap_startcapture() */ |
| 126 | int rmt_capstarted; /* 'true' if the capture is already started (needed to knoe if we have to call the pcap_startcapture() */ |
| 127 | char *currentfilter; /* Pointer to a buffer (allocated at run-time) that stores the current filter. Needed when flag PCAP_OPENFLAG_NOCAPTURE_RPCAP is turned on. */ |
| 128 | |
| 129 | uint8 protocol_version; /* negotiated protocol version */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 130 | uint8 uses_ssl; /* User asked for rpcaps scheme */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 131 | |
| 132 | unsigned int TotNetDrops; /* keeps the number of packets that have been dropped by the network */ |
| 133 | |
| 134 | /* |
| 135 | * This keeps the number of packets that have been received by the |
| 136 | * application. |
| 137 | * |
| 138 | * Packets dropped by the kernel buffer are not counted in this |
| 139 | * variable. It is always equal to (TotAccepted - TotDrops), |
| 140 | * except for the case of remote capture, in which we have also |
| 141 | * packets in flight, i.e. that have been transmitted by the remote |
| 142 | * host, but that have not been received (yet) from the client. |
| 143 | * In this case, (TotAccepted - TotDrops - TotNetDrops) gives a |
| 144 | * wrong result, since this number does not corresponds always to |
| 145 | * the number of packet received by the application. For this reason, |
| 146 | * in the remote capture we need another variable that takes into |
| 147 | * account of the number of packets actually received by the |
| 148 | * application. |
| 149 | */ |
| 150 | unsigned int TotCapt; |
| 151 | |
| 152 | struct pcap_stat stat; |
| 153 | /* XXX */ |
| 154 | struct pcap *next; /* list of open pcaps that need stuff cleared on close */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 155 | }; |
| 156 | |
| 157 | /**************************************************** |
| 158 | * * |
| 159 | * Locally defined functions * |
| 160 | * * |
| 161 | ****************************************************/ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 162 | static struct pcap_stat *rpcap_stats_rpcap(pcap_t *p, struct pcap_stat *ps, int mode); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 163 | static int pcap_pack_bpffilter(pcap_t *fp, char *sendbuf, int *sendbufidx, struct bpf_program *prog); |
| 164 | static int pcap_createfilter_norpcappkt(pcap_t *fp, struct bpf_program *prog); |
| 165 | static int pcap_updatefilter_remote(pcap_t *fp, struct bpf_program *prog); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 166 | static void pcap_save_current_filter_rpcap(pcap_t *fp, const char *filter); |
| 167 | static int pcap_setfilter_rpcap(pcap_t *fp, struct bpf_program *prog); |
| 168 | static int pcap_setsampling_remote(pcap_t *fp); |
| 169 | static int pcap_startcapture_remote(pcap_t *fp); |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 170 | static int rpcap_recv_msg_header(SOCKET sock, SSL *, struct rpcap_header *header, char *errbuf); |
| 171 | static int rpcap_check_msg_ver(SOCKET sock, SSL *, uint8 expected_ver, struct rpcap_header *header, char *errbuf); |
| 172 | static int rpcap_check_msg_type(SOCKET sock, SSL *, uint8 request_type, struct rpcap_header *header, uint16 *errcode, char *errbuf); |
| 173 | static int rpcap_process_msg_header(SOCKET sock, SSL *, uint8 ver, uint8 request_type, struct rpcap_header *header, char *errbuf); |
| 174 | static int rpcap_recv(SOCKET sock, SSL *, void *buffer, size_t toread, uint32 *plen, char *errbuf); |
| 175 | static void rpcap_msg_err(SOCKET sockctrl, SSL *, uint32 plen, char *remote_errbuf); |
| 176 | static int rpcap_discard(SOCKET sock, SSL *, uint32 len, char *errbuf); |
| 177 | static int rpcap_read_packet_msg(struct pcap_rpcap const *, pcap_t *p, size_t size); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 178 | |
| 179 | /**************************************************** |
| 180 | * * |
| 181 | * Function bodies * |
| 182 | * * |
| 183 | ****************************************************/ |
| 184 | |
| 185 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 186 | * This function translates (i.e. de-serializes) a 'rpcap_sockaddr' |
| 187 | * structure from the network byte order to a 'sockaddr_in" or |
| 188 | * 'sockaddr_in6' structure in the host byte order. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 189 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 190 | * It accepts an 'rpcap_sockaddr' structure as it is received from the |
| 191 | * network, and checks the address family field against various values |
| 192 | * to see whether it looks like an IPv4 address, an IPv6 address, or |
| 193 | * neither of those. It checks for multiple values in order to try |
| 194 | * to handle older rpcap daemons that sent the native OS's 'sockaddr_in' |
| 195 | * or 'sockaddr_in6' structures over the wire with some members |
| 196 | * byte-swapped, and to handle the fact that AF_INET6 has different |
| 197 | * values on different OSes. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 198 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 199 | * For IPv4 addresses, it converts the address family to host byte |
| 200 | * order from network byte order and puts it into the structure, |
| 201 | * sets the length if a sockaddr structure has a length, converts the |
| 202 | * port number to host byte order from network byte order and puts |
| 203 | * it into the structure, copies over the IPv4 address, and zeroes |
| 204 | * out the zero padding. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 205 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 206 | * For IPv6 addresses, it converts the address family to host byte |
| 207 | * order from network byte order and puts it into the structure, |
| 208 | * sets the length if a sockaddr structure has a length, converts the |
| 209 | * port number and flow information to host byte order from network |
| 210 | * byte order and puts them into the structure, copies over the IPv6 |
| 211 | * address, and converts the scope ID to host byte order from network |
| 212 | * byte order and puts it into the structure. |
| 213 | * |
| 214 | * The function will allocate the 'sockaddrout' variable according to the |
| 215 | * address family in use. In case the address does not belong to the |
| 216 | * AF_INET nor AF_INET6 families, 'sockaddrout' is not allocated and a |
| 217 | * NULL pointer is returned. This usually happens because that address |
| 218 | * does not exist on the other host, or is of an address family other |
| 219 | * than AF_INET or AF_INET6, so the RPCAP daemon sent a 'sockaddr_storage' |
| 220 | * structure containing all 'zero' values. |
| 221 | * |
| 222 | * Older RPCAPDs sent the addresses over the wire in the OS's native |
| 223 | * structure format. For most OSes, this looks like the over-the-wire |
| 224 | * format, but might have a different value for AF_INET6 than the value |
| 225 | * on the machine receiving the reply. For OSes with the newer BSD-style |
| 226 | * sockaddr structures, this has, instead of a 2-byte address family, |
| 227 | * a 1-byte structure length followed by a 1-byte address family. The |
| 228 | * RPCAPD code would put the address family in network byte order before |
| 229 | * sending it; that would set it to 0 on a little-endian machine, as |
| 230 | * htons() of any value between 1 and 255 would result in a value > 255, |
| 231 | * with its lower 8 bits zero, so putting that back into a 1-byte field |
| 232 | * would set it to 0. |
| 233 | * |
| 234 | * Therefore, for older RPCAPDs running on an OS with newer BSD-style |
| 235 | * sockaddr structures, the family field, if treated as a big-endian |
| 236 | * (network byte order) 16-bit field, would be: |
| 237 | * |
| 238 | * (length << 8) | family if sent by a big-endian machine |
| 239 | * (length << 8) if sent by a little-endian machine |
| 240 | * |
| 241 | * For current RPCAPDs, and for older RPCAPDs running on an OS with |
| 242 | * older BSD-style sockaddr structures, the family field, if treated |
| 243 | * as a big-endian 16-bit field, would just contain the family. |
| 244 | * |
| 245 | * \param sockaddrin: a 'rpcap_sockaddr' pointer to the variable that has |
| 246 | * to be de-serialized. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 247 | * |
| 248 | * \param sockaddrout: a 'sockaddr_storage' pointer to the variable that will contain |
| 249 | * the de-serialized data. The structure returned can be either a 'sockaddr_in' or 'sockaddr_in6'. |
| 250 | * This variable will be allocated automatically inside this function. |
| 251 | * |
| 252 | * \param errbuf: a pointer to a user-allocated buffer (of size PCAP_ERRBUF_SIZE) |
| 253 | * that will contain the error message (in case there is one). |
| 254 | * |
| 255 | * \return '0' if everything is fine, '-1' if some errors occurred. Basically, the error |
| 256 | * can be only the fact that the malloc() failed to allocate memory. |
| 257 | * The error message is returned in the 'errbuf' variable, while the deserialized address |
| 258 | * is returned into the 'sockaddrout' variable. |
| 259 | * |
| 260 | * \warning This function supports only AF_INET and AF_INET6 address families. |
| 261 | * |
| 262 | * \warning The sockaddrout (if not NULL) must be deallocated by the user. |
| 263 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 264 | |
| 265 | /* |
| 266 | * Possible IPv4 family values other than the designated over-the-wire value, |
| 267 | * which is 2 (because everybody uses 2 for AF_INET4). |
| 268 | */ |
| 269 | #define SOCKADDR_IN_LEN 16 /* length of struct sockaddr_in */ |
| 270 | #define SOCKADDR_IN6_LEN 28 /* length of struct sockaddr_in6 */ |
| 271 | #define NEW_BSD_AF_INET_BE ((SOCKADDR_IN_LEN << 8) | 2) |
| 272 | #define NEW_BSD_AF_INET_LE (SOCKADDR_IN_LEN << 8) |
| 273 | |
| 274 | /* |
| 275 | * Possible IPv6 family values other than the designated over-the-wire value, |
| 276 | * which is 23 (because that's what Windows uses, and most RPCAP servers |
| 277 | * out there are probably running Windows, as WinPcap includes the server |
| 278 | * but few if any UN*Xes build and ship it). |
| 279 | * |
| 280 | * The new BSD sockaddr structure format was in place before 4.4-Lite, so |
| 281 | * all the free-software BSDs use it. |
| 282 | */ |
| 283 | #define NEW_BSD_AF_INET6_BSD_BE ((SOCKADDR_IN6_LEN << 8) | 24) /* NetBSD, OpenBSD, BSD/OS */ |
| 284 | #define NEW_BSD_AF_INET6_FREEBSD_BE ((SOCKADDR_IN6_LEN << 8) | 28) /* FreeBSD, DragonFly BSD */ |
| 285 | #define NEW_BSD_AF_INET6_DARWIN_BE ((SOCKADDR_IN6_LEN << 8) | 30) /* macOS, iOS, anything else Darwin-based */ |
| 286 | #define NEW_BSD_AF_INET6_LE (SOCKADDR_IN6_LEN << 8) |
| 287 | #define LINUX_AF_INET6 10 |
| 288 | #define HPUX_AF_INET6 22 |
| 289 | #define AIX_AF_INET6 24 |
| 290 | #define SOLARIS_AF_INET6 26 |
| 291 | |
| 292 | static int |
| 293 | rpcap_deseraddr(struct rpcap_sockaddr *sockaddrin, struct sockaddr_storage **sockaddrout, char *errbuf) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 294 | { |
| 295 | /* Warning: we support only AF_INET and AF_INET6 */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 296 | switch (ntohs(sockaddrin->family)) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 297 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 298 | case RPCAP_AF_INET: |
| 299 | case NEW_BSD_AF_INET_BE: |
| 300 | case NEW_BSD_AF_INET_LE: |
| 301 | { |
| 302 | struct rpcap_sockaddr_in *sockaddrin_ipv4; |
| 303 | struct sockaddr_in *sockaddrout_ipv4; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 304 | |
| 305 | (*sockaddrout) = (struct sockaddr_storage *) malloc(sizeof(struct sockaddr_in)); |
| 306 | if ((*sockaddrout) == NULL) |
| 307 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 308 | pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, |
| 309 | errno, "malloc() failed"); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 310 | return -1; |
| 311 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 312 | sockaddrin_ipv4 = (struct rpcap_sockaddr_in *) sockaddrin; |
| 313 | sockaddrout_ipv4 = (struct sockaddr_in *) (*sockaddrout); |
| 314 | sockaddrout_ipv4->sin_family = AF_INET; |
| 315 | sockaddrout_ipv4->sin_port = ntohs(sockaddrin_ipv4->port); |
| 316 | memcpy(&sockaddrout_ipv4->sin_addr, &sockaddrin_ipv4->addr, sizeof(sockaddrout_ipv4->sin_addr)); |
| 317 | memset(sockaddrout_ipv4->sin_zero, 0, sizeof(sockaddrout_ipv4->sin_zero)); |
| 318 | break; |
| 319 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 320 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 321 | #ifdef AF_INET6 |
| 322 | case RPCAP_AF_INET6: |
| 323 | case NEW_BSD_AF_INET6_BSD_BE: |
| 324 | case NEW_BSD_AF_INET6_FREEBSD_BE: |
| 325 | case NEW_BSD_AF_INET6_DARWIN_BE: |
| 326 | case NEW_BSD_AF_INET6_LE: |
| 327 | case LINUX_AF_INET6: |
| 328 | case HPUX_AF_INET6: |
| 329 | case AIX_AF_INET6: |
| 330 | case SOLARIS_AF_INET6: |
| 331 | { |
| 332 | struct rpcap_sockaddr_in6 *sockaddrin_ipv6; |
| 333 | struct sockaddr_in6 *sockaddrout_ipv6; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 334 | |
| 335 | (*sockaddrout) = (struct sockaddr_storage *) malloc(sizeof(struct sockaddr_in6)); |
| 336 | if ((*sockaddrout) == NULL) |
| 337 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 338 | pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, |
| 339 | errno, "malloc() failed"); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 340 | return -1; |
| 341 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 342 | sockaddrin_ipv6 = (struct rpcap_sockaddr_in6 *) sockaddrin; |
| 343 | sockaddrout_ipv6 = (struct sockaddr_in6 *) (*sockaddrout); |
| 344 | sockaddrout_ipv6->sin6_family = AF_INET6; |
| 345 | sockaddrout_ipv6->sin6_port = ntohs(sockaddrin_ipv6->port); |
| 346 | sockaddrout_ipv6->sin6_flowinfo = ntohl(sockaddrin_ipv6->flowinfo); |
| 347 | memcpy(&sockaddrout_ipv6->sin6_addr, &sockaddrin_ipv6->addr, sizeof(sockaddrout_ipv6->sin6_addr)); |
| 348 | sockaddrout_ipv6->sin6_scope_id = ntohl(sockaddrin_ipv6->scope_id); |
| 349 | break; |
| 350 | } |
| 351 | #endif |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 352 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 353 | default: |
| 354 | /* |
| 355 | * It is neither AF_INET nor AF_INET6 (or, if the OS doesn't |
| 356 | * support AF_INET6, it's not AF_INET). |
| 357 | */ |
| 358 | *sockaddrout = NULL; |
| 359 | break; |
| 360 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 361 | return 0; |
| 362 | } |
| 363 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 364 | /* |
| 365 | * This function reads a packet from the network socket. It does not |
| 366 | * deliver the packet to a pcap_dispatch()/pcap_loop() callback (hence |
| 367 | * the "nocb" string into its name). |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 368 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 369 | * This function is called by pcap_read_rpcap(). |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 370 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 371 | * WARNING: By choice, this function does not make use of semaphores. A smarter |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 372 | * implementation should put a semaphore into the data thread, and a signal will |
| 373 | * be raised as soon as there is data into the socket buffer. |
| 374 | * However this is complicated and it does not bring any advantages when reading |
| 375 | * from the network, in which network delays can be much more important than |
| 376 | * these optimizations. Therefore, we chose the following approach: |
| 377 | * - the 'timeout' chosen by the user is split in two (half on the server side, |
| 378 | * with the usual meaning, and half on the client side) |
| 379 | * - this function checks for packets; if there are no packets, it waits for |
| 380 | * timeout/2 and then it checks again. If packets are still missing, it returns, |
| 381 | * otherwise it reads packets. |
| 382 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 383 | static int pcap_read_nocb_remote(pcap_t *p, struct pcap_pkthdr *pkt_header, u_char **pkt_data) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 384 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 385 | struct pcap_rpcap *pr = p->priv; /* structure used when doing a remote live capture */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 386 | struct rpcap_header *header; /* general header according to the RPCAP format */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 387 | struct rpcap_pkthdr *net_pkt_header; /* header of the packet, from the message */ |
| 388 | u_char *net_pkt_data; /* packet data from the message */ |
| 389 | uint32 plen; |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 390 | int retval = 0; /* generic return value */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 391 | int msglen; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 392 | |
| 393 | /* Structures needed for the select() call */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 394 | struct timeval tv; /* maximum time the select() can block waiting for data */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 395 | fd_set rfds; /* set of socket descriptors we have to check */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 396 | |
| 397 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 398 | * Define the packet buffer timeout, to be used in the select() |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 399 | * 'timeout', in pcap_t, is in milliseconds; we have to convert it into sec and microsec |
| 400 | */ |
| 401 | tv.tv_sec = p->opt.timeout / 1000; |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 402 | tv.tv_usec = (suseconds_t)((p->opt.timeout - tv.tv_sec * 1000) * 1000); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 403 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 404 | #ifdef HAVE_OPENSSL |
| 405 | /* Check if we still have bytes available in the last decoded TLS record. |
| 406 | * If that's the case, we know SSL_read will not block. */ |
| 407 | retval = pr->data_ssl && SSL_pending(pr->data_ssl) > 0; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 408 | #endif |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 409 | if (! retval) |
| 410 | { |
| 411 | /* Watch out sockdata to see if it has input */ |
| 412 | FD_ZERO(&rfds); |
| 413 | |
| 414 | /* |
| 415 | * 'fp->rmt_sockdata' has always to be set before calling the select(), |
| 416 | * since it is cleared by the select() |
| 417 | */ |
| 418 | FD_SET(pr->rmt_sockdata, &rfds); |
| 419 | |
| 420 | #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION |
| 421 | retval = 1; |
| 422 | #else |
| 423 | retval = select((int) pr->rmt_sockdata + 1, &rfds, NULL, NULL, &tv); |
| 424 | #endif |
| 425 | |
| 426 | if (retval == -1) |
| 427 | { |
| 428 | #ifndef _WIN32 |
| 429 | if (errno == EINTR) |
| 430 | { |
| 431 | /* Interrupted. */ |
| 432 | return 0; |
| 433 | } |
| 434 | #endif |
| 435 | sock_geterror("select()", p->errbuf, PCAP_ERRBUF_SIZE); |
| 436 | return -1; |
| 437 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 438 | } |
| 439 | |
| 440 | /* There is no data waiting, so return '0' */ |
| 441 | if (retval == 0) |
| 442 | return 0; |
| 443 | |
| 444 | /* |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 445 | * We have to define 'header' as a pointer to a larger buffer, |
| 446 | * because in case of UDP we have to read all the message within a single call |
| 447 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 448 | header = (struct rpcap_header *) p->buffer; |
| 449 | net_pkt_header = (struct rpcap_pkthdr *) ((char *)p->buffer + sizeof(struct rpcap_header)); |
| 450 | net_pkt_data = (u_char *)p->buffer + sizeof(struct rpcap_header) + sizeof(struct rpcap_pkthdr); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 451 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 452 | if (pr->rmt_flags & PCAP_OPENFLAG_DATATX_UDP) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 453 | { |
| 454 | /* Read the entire message from the network */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 455 | msglen = sock_recv_dgram(pr->rmt_sockdata, pr->data_ssl, p->buffer, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 456 | p->bufsize, p->errbuf, PCAP_ERRBUF_SIZE); |
| 457 | if (msglen == -1) |
| 458 | { |
| 459 | /* Network error. */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 460 | return -1; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 461 | } |
| 462 | if (msglen == -3) |
| 463 | { |
| 464 | /* Interrupted receive. */ |
| 465 | return 0; |
| 466 | } |
| 467 | if ((size_t)msglen < sizeof(struct rpcap_header)) |
| 468 | { |
| 469 | /* |
| 470 | * Message is shorter than an rpcap header. |
| 471 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 472 | snprintf(p->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 473 | "UDP packet message is shorter than an rpcap header"); |
| 474 | return -1; |
| 475 | } |
| 476 | plen = ntohl(header->plen); |
| 477 | if ((size_t)msglen < sizeof(struct rpcap_header) + plen) |
| 478 | { |
| 479 | /* |
| 480 | * Message is shorter than the header claims it |
| 481 | * is. |
| 482 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 483 | snprintf(p->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 484 | "UDP packet message is shorter than its rpcap header claims"); |
| 485 | return -1; |
| 486 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 487 | } |
| 488 | else |
| 489 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 490 | int status; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 491 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 492 | if ((size_t)p->cc < sizeof(struct rpcap_header)) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 493 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 494 | /* |
| 495 | * We haven't read any of the packet header yet. |
| 496 | * The size we should get is the size of the |
| 497 | * packet header. |
| 498 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 499 | status = rpcap_read_packet_msg(pr, p, sizeof(struct rpcap_header)); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 500 | if (status == -1) |
| 501 | { |
| 502 | /* Network error. */ |
| 503 | return -1; |
| 504 | } |
| 505 | if (status == -3) |
| 506 | { |
| 507 | /* Interrupted receive. */ |
| 508 | return 0; |
| 509 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 510 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 511 | |
| 512 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 513 | * We have the header, so we know how long the |
| 514 | * message payload is. The size we should get |
| 515 | * is the size of the packet header plus the |
| 516 | * size of the payload. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 517 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 518 | plen = ntohl(header->plen); |
| 519 | if (plen > p->bufsize - sizeof(struct rpcap_header)) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 520 | { |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 521 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 522 | * This is bigger than the largest |
| 523 | * record we'd expect. (We do it by |
| 524 | * subtracting in order to avoid an |
| 525 | * overflow.) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 526 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 527 | snprintf(p->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 528 | "Server sent us a message larger than the largest expected packet message"); |
| 529 | return -1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 530 | } |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 531 | status = rpcap_read_packet_msg(pr, p, sizeof(struct rpcap_header) + plen); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 532 | if (status == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 533 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 534 | /* Network error. */ |
| 535 | return -1; |
| 536 | } |
| 537 | if (status == -3) |
| 538 | { |
| 539 | /* Interrupted receive. */ |
| 540 | return 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 541 | } |
| 542 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 543 | /* |
| 544 | * We have the entire message; reset the buffer pointer |
| 545 | * and count, as the next read should start a new |
| 546 | * message. |
| 547 | */ |
| 548 | p->bp = p->buffer; |
| 549 | p->cc = 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 550 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 551 | |
| 552 | /* |
| 553 | * We have the entire message. |
| 554 | */ |
| 555 | header->plen = plen; |
| 556 | |
| 557 | /* |
| 558 | * Did the server specify the version we negotiated? |
| 559 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 560 | if (rpcap_check_msg_ver(pr->rmt_sockdata, pr->data_ssl, pr->protocol_version, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 561 | header, p->errbuf) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 562 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 563 | return 0; /* Return 'no packets received' */ |
| 564 | } |
| 565 | |
| 566 | /* |
| 567 | * Is this a RPCAP_MSG_PACKET message? |
| 568 | */ |
| 569 | if (header->type != RPCAP_MSG_PACKET) |
| 570 | { |
| 571 | return 0; /* Return 'no packets received' */ |
| 572 | } |
| 573 | |
| 574 | if (ntohl(net_pkt_header->caplen) > plen) |
| 575 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 576 | snprintf(p->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 577 | "Packet's captured data goes past the end of the received packet message."); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 578 | return -1; |
| 579 | } |
| 580 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 581 | /* Fill in packet header */ |
| 582 | pkt_header->caplen = ntohl(net_pkt_header->caplen); |
| 583 | pkt_header->len = ntohl(net_pkt_header->len); |
| 584 | pkt_header->ts.tv_sec = ntohl(net_pkt_header->timestamp_sec); |
| 585 | pkt_header->ts.tv_usec = ntohl(net_pkt_header->timestamp_usec); |
| 586 | |
| 587 | /* Supply a pointer to the beginning of the packet data */ |
| 588 | *pkt_data = net_pkt_data; |
| 589 | |
| 590 | /* |
| 591 | * I don't update the counter of the packets dropped by the network since we're using TCP, |
| 592 | * therefore no packets are dropped. Just update the number of packets received correctly |
| 593 | */ |
| 594 | pr->TotCapt++; |
| 595 | |
| 596 | if (pr->rmt_flags & PCAP_OPENFLAG_DATATX_UDP) |
| 597 | { |
| 598 | unsigned int npkt; |
| 599 | |
| 600 | /* We're using UDP, so we need to update the counter of the packets dropped by the network */ |
| 601 | npkt = ntohl(net_pkt_header->npkt); |
| 602 | |
| 603 | if (pr->TotCapt != npkt) |
| 604 | { |
| 605 | pr->TotNetDrops += (npkt - pr->TotCapt); |
| 606 | pr->TotCapt = npkt; |
| 607 | } |
| 608 | } |
| 609 | |
| 610 | /* Packet read successfully */ |
| 611 | return 1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 612 | } |
| 613 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 614 | /* |
| 615 | * This function reads a packet from the network socket. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 616 | * |
| 617 | * This function relies on the pcap_read_nocb_remote to deliver packets. The |
| 618 | * difference, here, is that as soon as a packet is read, it is delivered |
| 619 | * to the application by means of a callback function. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 620 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 621 | static int pcap_read_rpcap(pcap_t *p, int cnt, pcap_handler callback, u_char *user) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 622 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 623 | struct pcap_rpcap *pr = p->priv; /* structure used when doing a remote live capture */ |
| 624 | struct pcap_pkthdr pkt_header; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 625 | u_char *pkt_data; |
| 626 | int n = 0; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 627 | int ret; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 628 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 629 | /* |
| 630 | * If this is client-side, and we haven't already started |
| 631 | * the capture, start it now. |
| 632 | */ |
| 633 | if (pr->rmt_clientside) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 634 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 635 | /* We are on an remote capture */ |
| 636 | if (!pr->rmt_capstarted) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 637 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 638 | /* |
| 639 | * The capture isn't started yet, so try to |
| 640 | * start it. |
| 641 | */ |
| 642 | if (pcap_startcapture_remote(p)) |
| 643 | return -1; |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | while (n < cnt || PACKET_COUNT_IS_UNLIMITED(cnt)) |
| 648 | { |
| 649 | /* |
| 650 | * Has "pcap_breakloop()" been called? |
| 651 | */ |
| 652 | if (p->break_loop) { |
| 653 | /* |
| 654 | * Yes - clear the flag that indicates that it |
| 655 | * has, and return PCAP_ERROR_BREAK to indicate |
| 656 | * that we were told to break out of the loop. |
| 657 | */ |
| 658 | p->break_loop = 0; |
| 659 | return (PCAP_ERROR_BREAK); |
| 660 | } |
| 661 | |
| 662 | /* |
| 663 | * Read some packets. |
| 664 | */ |
| 665 | ret = pcap_read_nocb_remote(p, &pkt_header, &pkt_data); |
| 666 | if (ret == 1) |
| 667 | { |
| 668 | /* |
| 669 | * We got a packet. Hand it to the callback |
| 670 | * and count it so we can return the count. |
| 671 | */ |
| 672 | (*callback)(user, &pkt_header, pkt_data); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 673 | n++; |
| 674 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 675 | else if (ret == -1) |
| 676 | { |
| 677 | /* Error. */ |
| 678 | return ret; |
| 679 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 680 | else |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 681 | { |
| 682 | /* |
| 683 | * No packet; this could mean that we timed |
| 684 | * out, or that we got interrupted, or that |
| 685 | * we got a bad packet. |
| 686 | * |
| 687 | * Were we told to break out of the loop? |
| 688 | */ |
| 689 | if (p->break_loop) { |
| 690 | /* |
| 691 | * Yes. |
| 692 | */ |
| 693 | p->break_loop = 0; |
| 694 | return (PCAP_ERROR_BREAK); |
| 695 | } |
| 696 | /* No - return the number of packets we've processed. */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 697 | return n; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 698 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 699 | } |
| 700 | return n; |
| 701 | } |
| 702 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 703 | /* |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 704 | * This function sends a CLOSE command to the capture server if we're in |
| 705 | * passive mode and an ENDCAP command to the capture server if we're in |
| 706 | * active mode. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 707 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 708 | * It is called when the user calls pcap_close(). It sends a command |
| 709 | * to our peer that says 'ok, let's stop capturing'. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 710 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 711 | * WARNING: Since we're closing the connection, we do not check for errors. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 712 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 713 | static void pcap_cleanup_rpcap(pcap_t *fp) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 714 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 715 | struct pcap_rpcap *pr = fp->priv; /* structure used when doing a remote live capture */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 716 | struct rpcap_header header; /* header of the RPCAP packet */ |
| 717 | struct activehosts *temp; /* temp var needed to scan the host list chain, to detect if we're in active mode */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 718 | int active = 0; /* active mode or not? */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 719 | |
| 720 | /* detect if we're in active mode */ |
| 721 | temp = activeHosts; |
| 722 | while (temp) |
| 723 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 724 | if (temp->sockctrl == pr->rmt_sockctrl) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 725 | { |
| 726 | active = 1; |
| 727 | break; |
| 728 | } |
| 729 | temp = temp->next; |
| 730 | } |
| 731 | |
| 732 | if (!active) |
| 733 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 734 | rpcap_createhdr(&header, pr->protocol_version, |
| 735 | RPCAP_MSG_CLOSE, 0, 0); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 736 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 737 | /* |
| 738 | * Send the close request; don't report any errors, as |
| 739 | * we're closing this pcap_t, and have no place to report |
| 740 | * the error. No reply is sent to this message. |
| 741 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 742 | (void)sock_send(pr->rmt_sockctrl, pr->ctrl_ssl, (char *)&header, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 743 | sizeof(struct rpcap_header), NULL, 0); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 744 | } |
| 745 | else |
| 746 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 747 | rpcap_createhdr(&header, pr->protocol_version, |
| 748 | RPCAP_MSG_ENDCAP_REQ, 0, 0); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 749 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 750 | /* |
| 751 | * Send the end capture request; don't report any errors, |
| 752 | * as we're closing this pcap_t, and have no place to |
| 753 | * report the error. |
| 754 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 755 | if (sock_send(pr->rmt_sockctrl, pr->ctrl_ssl, (char *)&header, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 756 | sizeof(struct rpcap_header), NULL, 0) == 0) |
| 757 | { |
| 758 | /* |
| 759 | * Wait for the answer; don't report any errors, |
| 760 | * as we're closing this pcap_t, and have no |
| 761 | * place to report the error. |
| 762 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 763 | if (rpcap_process_msg_header(pr->rmt_sockctrl, pr->ctrl_ssl, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 764 | pr->protocol_version, RPCAP_MSG_ENDCAP_REQ, |
| 765 | &header, NULL) == 0) |
| 766 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 767 | (void)rpcap_discard(pr->rmt_sockctrl, pr->ctrl_ssl, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 768 | header.plen, NULL); |
| 769 | } |
| 770 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 771 | } |
| 772 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 773 | if (pr->rmt_sockdata) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 774 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 775 | #ifdef HAVE_OPENSSL |
| 776 | if (pr->data_ssl) |
| 777 | { |
| 778 | // Finish using the SSL handle for the data socket. |
| 779 | // This must be done *before* the socket is closed. |
| 780 | ssl_finish(pr->data_ssl); |
| 781 | pr->data_ssl = NULL; |
| 782 | } |
| 783 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 784 | sock_close(pr->rmt_sockdata, NULL, 0); |
| 785 | pr->rmt_sockdata = 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 786 | } |
| 787 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 788 | if ((!active) && (pr->rmt_sockctrl)) |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 789 | { |
| 790 | #ifdef HAVE_OPENSSL |
| 791 | if (pr->ctrl_ssl) |
| 792 | { |
| 793 | // Finish using the SSL handle for the control socket. |
| 794 | // This must be done *before* the socket is closed. |
| 795 | ssl_finish(pr->ctrl_ssl); |
| 796 | pr->ctrl_ssl = NULL; |
| 797 | } |
| 798 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 799 | sock_close(pr->rmt_sockctrl, NULL, 0); |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 800 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 801 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 802 | pr->rmt_sockctrl = 0; |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 803 | pr->ctrl_ssl = NULL; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 804 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 805 | if (pr->currentfilter) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 806 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 807 | free(pr->currentfilter); |
| 808 | pr->currentfilter = NULL; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 809 | } |
| 810 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 811 | pcap_cleanup_live_common(fp); |
| 812 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 813 | /* To avoid inconsistencies in the number of sock_init() */ |
| 814 | sock_cleanup(); |
| 815 | } |
| 816 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 817 | /* |
| 818 | * This function retrieves network statistics from our peer; |
| 819 | * it provides only the standard statistics. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 820 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 821 | static int pcap_stats_rpcap(pcap_t *p, struct pcap_stat *ps) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 822 | { |
| 823 | struct pcap_stat *retval; |
| 824 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 825 | retval = rpcap_stats_rpcap(p, ps, PCAP_STATS_STANDARD); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 826 | |
| 827 | if (retval) |
| 828 | return 0; |
| 829 | else |
| 830 | return -1; |
| 831 | } |
| 832 | |
| 833 | #ifdef _WIN32 |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 834 | /* |
| 835 | * This function retrieves network statistics from our peer; |
| 836 | * it provides the additional statistics supported by pcap_stats_ex(). |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 837 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 838 | static struct pcap_stat *pcap_stats_ex_rpcap(pcap_t *p, int *pcap_stat_size) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 839 | { |
| 840 | *pcap_stat_size = sizeof (p->stat); |
| 841 | |
| 842 | /* PCAP_STATS_EX (third param) means 'extended pcap_stats()' */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 843 | return (rpcap_stats_rpcap(p, &(p->stat), PCAP_STATS_EX)); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 844 | } |
| 845 | #endif |
| 846 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 847 | /* |
| 848 | * This function retrieves network statistics from our peer. It |
| 849 | * is used by the two previous functions. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 850 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 851 | * It can be called in two modes: |
| 852 | * - PCAP_STATS_STANDARD: if we want just standard statistics (i.e., |
| 853 | * for pcap_stats()) |
| 854 | * - PCAP_STATS_EX: if we want extended statistics (i.e., for |
| 855 | * pcap_stats_ex()) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 856 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 857 | * This 'mode' parameter is needed because in pcap_stats() the variable that |
| 858 | * keeps the statistics is allocated by the user. On Windows, this structure |
| 859 | * has been extended in order to keep new stats. However, if the user has a |
| 860 | * smaller structure and it passes it to pcap_stats(), this function will |
| 861 | * try to fill in more data than the size of the structure, so that memory |
| 862 | * after the structure will be overwritten. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 863 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 864 | * So, we need to know it we have to copy just the standard fields, or the |
| 865 | * extended fields as well. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 866 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 867 | * In case we want to copy the extended fields as well, the problem of |
| 868 | * memory overflow no longer exists because the structure that's filled |
| 869 | * in is part of the pcap_t, so that it can be guaranteed to be large |
| 870 | * enough for the additional statistics. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 871 | * |
| 872 | * \param p: the pcap_t structure related to the current instance. |
| 873 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 874 | * \param ps: a pointer to a 'pcap_stat' structure, needed for compatibility |
| 875 | * with pcap_stat(), where the structure is allocated by the user. In case |
| 876 | * of pcap_stats_ex(), this structure and the function return value point |
| 877 | * to the same variable. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 878 | * |
| 879 | * \param mode: one of PCAP_STATS_STANDARD or PCAP_STATS_EX. |
| 880 | * |
| 881 | * \return The structure that keeps the statistics, or NULL in case of error. |
| 882 | * The error string is placed in the pcap_t structure. |
| 883 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 884 | static struct pcap_stat *rpcap_stats_rpcap(pcap_t *p, struct pcap_stat *ps, int mode) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 885 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 886 | struct pcap_rpcap *pr = p->priv; /* structure used when doing a remote live capture */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 887 | struct rpcap_header header; /* header of the RPCAP packet */ |
| 888 | struct rpcap_stats netstats; /* statistics sent on the network */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 889 | uint32 plen; /* data remaining in the message */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 890 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 891 | #ifdef _WIN32 |
| 892 | if (mode != PCAP_STATS_STANDARD && mode != PCAP_STATS_EX) |
| 893 | #else |
| 894 | if (mode != PCAP_STATS_STANDARD) |
| 895 | #endif |
| 896 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 897 | snprintf(p->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 898 | "Invalid stats mode %d", mode); |
| 899 | return NULL; |
| 900 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 901 | |
| 902 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 903 | * If the capture has not yet started, we cannot request statistics |
| 904 | * for the capture from our peer, so we return 0 for all statistics, |
| 905 | * as nothing's been seen yet. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 906 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 907 | if (!pr->rmt_capstarted) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 908 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 909 | ps->ps_drop = 0; |
| 910 | ps->ps_ifdrop = 0; |
| 911 | ps->ps_recv = 0; |
| 912 | #ifdef _WIN32 |
| 913 | if (mode == PCAP_STATS_EX) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 914 | { |
| 915 | ps->ps_capt = 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 916 | ps->ps_sent = 0; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 917 | ps->ps_netdrop = 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 918 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 919 | #endif /* _WIN32 */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 920 | |
| 921 | return ps; |
| 922 | } |
| 923 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 924 | rpcap_createhdr(&header, pr->protocol_version, |
| 925 | RPCAP_MSG_STATS_REQ, 0, 0); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 926 | |
| 927 | /* Send the PCAP_STATS command */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 928 | if (sock_send(pr->rmt_sockctrl, pr->ctrl_ssl, (char *)&header, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 929 | sizeof(struct rpcap_header), p->errbuf, PCAP_ERRBUF_SIZE) < 0) |
| 930 | return NULL; /* Unrecoverable network error */ |
| 931 | |
| 932 | /* Receive and process the reply message header. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 933 | if (rpcap_process_msg_header(pr->rmt_sockctrl, pr->ctrl_ssl, pr->protocol_version, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 934 | RPCAP_MSG_STATS_REQ, &header, p->errbuf) == -1) |
| 935 | return NULL; /* Error */ |
| 936 | |
| 937 | plen = header.plen; |
| 938 | |
| 939 | /* Read the reply body */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 940 | if (rpcap_recv(pr->rmt_sockctrl, pr->ctrl_ssl, (char *)&netstats, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 941 | sizeof(struct rpcap_stats), &plen, p->errbuf) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 942 | goto error; |
| 943 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 944 | ps->ps_drop = ntohl(netstats.krnldrop); |
| 945 | ps->ps_ifdrop = ntohl(netstats.ifdrop); |
| 946 | ps->ps_recv = ntohl(netstats.ifrecv); |
| 947 | #ifdef _WIN32 |
| 948 | if (mode == PCAP_STATS_EX) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 949 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 950 | ps->ps_capt = pr->TotCapt; |
| 951 | ps->ps_netdrop = pr->TotNetDrops; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 952 | ps->ps_sent = ntohl(netstats.svrcapt); |
| 953 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 954 | #endif /* _WIN32 */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 955 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 956 | /* Discard the rest of the message. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 957 | if (rpcap_discard(pr->rmt_sockctrl, pr->ctrl_ssl, plen, p->errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 958 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 959 | |
| 960 | return ps; |
| 961 | |
| 962 | error: |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 963 | /* |
| 964 | * Discard the rest of the message. |
| 965 | * We already reported an error; if this gets an error, just |
| 966 | * drive on. |
| 967 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 968 | (void)rpcap_discard(pr->rmt_sockctrl, pr->ctrl_ssl, plen, NULL); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 969 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 970 | error_nodiscard: |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 971 | return NULL; |
| 972 | } |
| 973 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 974 | /* |
| 975 | * This function returns the entry in the list of active hosts for this |
| 976 | * active connection (active mode only), or NULL if there is no |
| 977 | * active connection or an error occurred. It is just for internal |
| 978 | * use. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 979 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 980 | * \param host: a string that keeps the host name of the host for which we |
| 981 | * want to get the socket ID for that active connection. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 982 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 983 | * \param error: a pointer to an int that is set to 1 if an error occurred |
| 984 | * and 0 otherwise. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 985 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 986 | * \param errbuf: a pointer to a user-allocated buffer (of size |
| 987 | * PCAP_ERRBUF_SIZE) that will contain the error message (in case |
| 988 | * there is one). |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 989 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 990 | * \return the entry for this host in the list of active connections |
| 991 | * if found, NULL if it's not found or there's an error. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 992 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 993 | static struct activehosts * |
| 994 | rpcap_remoteact_getsock(const char *host, int *error, char *errbuf) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 995 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 996 | struct activehosts *temp; /* temp var needed to scan the host list chain */ |
| 997 | struct addrinfo hints, *addrinfo, *ai_next; /* temp var needed to translate between hostname to its address */ |
| 998 | int retval; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 999 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1000 | /* retrieve the network address corresponding to 'host' */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1001 | addrinfo = NULL; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1002 | memset(&hints, 0, sizeof(struct addrinfo)); |
| 1003 | hints.ai_family = PF_UNSPEC; |
| 1004 | hints.ai_socktype = SOCK_STREAM; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1005 | |
Elliott Hughes | 773b27c | 2021-08-20 17:37:36 -0700 | [diff] [blame] | 1006 | retval = sock_initaddress(host, "0", &hints, &addrinfo, errbuf, |
| 1007 | PCAP_ERRBUF_SIZE); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1008 | if (retval != 0) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1009 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1010 | *error = 1; |
| 1011 | return NULL; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1012 | } |
| 1013 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1014 | temp = activeHosts; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1015 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1016 | while (temp) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1017 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1018 | ai_next = addrinfo; |
| 1019 | while (ai_next) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1020 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1021 | if (sock_cmpaddr(&temp->host, (struct sockaddr_storage *) ai_next->ai_addr) == 0) |
| 1022 | { |
| 1023 | *error = 0; |
| 1024 | freeaddrinfo(addrinfo); |
| 1025 | return temp; |
| 1026 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1027 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1028 | ai_next = ai_next->ai_next; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1029 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1030 | temp = temp->next; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1031 | } |
| 1032 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1033 | if (addrinfo) |
| 1034 | freeaddrinfo(addrinfo); |
| 1035 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1036 | /* |
| 1037 | * The host for which you want to get the socket ID does not have an |
| 1038 | * active connection. |
| 1039 | */ |
| 1040 | *error = 0; |
| 1041 | return NULL; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1042 | } |
| 1043 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1044 | /* |
| 1045 | * This function starts a remote capture. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1046 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1047 | * This function is required since the RPCAP protocol decouples the 'open' |
| 1048 | * from the 'start capture' functions. |
| 1049 | * This function takes all the parameters needed (which have been stored |
| 1050 | * into the pcap_t structure) and sends them to the server. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1051 | * |
| 1052 | * \param fp: the pcap_t descriptor of the device currently open. |
| 1053 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1054 | * \return '0' if everything is fine, '-1' otherwise. The error message |
| 1055 | * (if one) is returned into the 'errbuf' field of the pcap_t structure. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1056 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1057 | static int pcap_startcapture_remote(pcap_t *fp) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1058 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1059 | struct pcap_rpcap *pr = fp->priv; /* structure used when doing a remote live capture */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1060 | char sendbuf[RPCAP_NETBUF_SIZE]; /* temporary buffer in which data to be sent is buffered */ |
| 1061 | int sendbufidx = 0; /* index which keeps the number of bytes currently buffered */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1062 | char portdata[PCAP_BUF_SIZE]; /* temp variable needed to keep the network port for the data connection */ |
| 1063 | uint32 plen; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1064 | int active = 0; /* '1' if we're in active mode */ |
| 1065 | struct activehosts *temp; /* temp var needed to scan the host list chain, to detect if we're in active mode */ |
| 1066 | char host[INET6_ADDRSTRLEN + 1]; /* numeric name of the other host */ |
| 1067 | |
| 1068 | /* socket-related variables*/ |
| 1069 | struct addrinfo hints; /* temp, needed to open a socket connection */ |
| 1070 | struct addrinfo *addrinfo; /* temp, needed to open a socket connection */ |
| 1071 | SOCKET sockdata = 0; /* socket descriptor of the data connection */ |
| 1072 | struct sockaddr_storage saddr; /* temp, needed to retrieve the network data port chosen on the local machine */ |
| 1073 | socklen_t saddrlen; /* temp, needed to retrieve the network data port chosen on the local machine */ |
| 1074 | int ai_family; /* temp, keeps the address family used by the control connection */ |
| 1075 | |
| 1076 | /* RPCAP-related variables*/ |
| 1077 | struct rpcap_header header; /* header of the RPCAP packet */ |
| 1078 | struct rpcap_startcapreq *startcapreq; /* start capture request message */ |
| 1079 | struct rpcap_startcapreply startcapreply; /* start capture reply message */ |
| 1080 | |
| 1081 | /* Variables related to the buffer setting */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1082 | int res; |
| 1083 | socklen_t itemp; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1084 | int sockbufsize = 0; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1085 | uint32 server_sockbufsize; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1086 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1087 | // Take the opportunity to clear pr->data_ssl before any goto error, |
| 1088 | // as it seems pr->priv is not zeroed after its malloced. |
| 1089 | pr->data_ssl = NULL; |
| 1090 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1091 | /* |
| 1092 | * Let's check if sampling has been required. |
| 1093 | * If so, let's set it first |
| 1094 | */ |
| 1095 | if (pcap_setsampling_remote(fp) != 0) |
| 1096 | return -1; |
| 1097 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1098 | /* detect if we're in active mode */ |
| 1099 | temp = activeHosts; |
| 1100 | while (temp) |
| 1101 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1102 | if (temp->sockctrl == pr->rmt_sockctrl) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1103 | { |
| 1104 | active = 1; |
| 1105 | break; |
| 1106 | } |
| 1107 | temp = temp->next; |
| 1108 | } |
| 1109 | |
| 1110 | addrinfo = NULL; |
| 1111 | |
| 1112 | /* |
| 1113 | * Gets the complete sockaddr structure used in the ctrl connection |
| 1114 | * This is needed to get the address family of the control socket |
| 1115 | * Tip: I cannot save the ai_family of the ctrl sock in the pcap_t struct, |
| 1116 | * since the ctrl socket can already be open in case of active mode; |
| 1117 | * so I would have to call getpeername() anyway |
| 1118 | */ |
| 1119 | saddrlen = sizeof(struct sockaddr_storage); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1120 | if (getpeername(pr->rmt_sockctrl, (struct sockaddr *) &saddr, &saddrlen) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1121 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1122 | sock_geterror("getsockname()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1123 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1124 | } |
| 1125 | ai_family = ((struct sockaddr_storage *) &saddr)->ss_family; |
| 1126 | |
| 1127 | /* Get the numeric address of the remote host we are connected to */ |
| 1128 | if (getnameinfo((struct sockaddr *) &saddr, saddrlen, host, |
| 1129 | sizeof(host), NULL, 0, NI_NUMERICHOST)) |
| 1130 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1131 | sock_geterror("getnameinfo()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1132 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1133 | } |
| 1134 | |
| 1135 | /* |
| 1136 | * Data connection is opened by the server toward the client if: |
| 1137 | * - we're using TCP, and the user wants us to be in active mode |
| 1138 | * - we're using UDP |
| 1139 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1140 | if ((active) || (pr->rmt_flags & PCAP_OPENFLAG_DATATX_UDP)) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1141 | { |
| 1142 | /* |
| 1143 | * We have to create a new socket to receive packets |
| 1144 | * We have to do that immediately, since we have to tell the other |
| 1145 | * end which network port we picked up |
| 1146 | */ |
| 1147 | memset(&hints, 0, sizeof(struct addrinfo)); |
| 1148 | /* TEMP addrinfo is NULL in case of active */ |
| 1149 | hints.ai_family = ai_family; /* Use the same address family of the control socket */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1150 | hints.ai_socktype = (pr->rmt_flags & PCAP_OPENFLAG_DATATX_UDP) ? SOCK_DGRAM : SOCK_STREAM; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1151 | hints.ai_flags = AI_PASSIVE; /* Data connection is opened by the server toward the client */ |
| 1152 | |
| 1153 | /* Let's the server pick up a free network port for us */ |
| 1154 | if (sock_initaddress(NULL, "0", &hints, &addrinfo, fp->errbuf, PCAP_ERRBUF_SIZE) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1155 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1156 | |
| 1157 | if ((sockdata = sock_open(addrinfo, SOCKOPEN_SERVER, |
| 1158 | 1 /* max 1 connection in queue */, fp->errbuf, PCAP_ERRBUF_SIZE)) == INVALID_SOCKET) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1159 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1160 | |
| 1161 | /* addrinfo is no longer used */ |
| 1162 | freeaddrinfo(addrinfo); |
| 1163 | addrinfo = NULL; |
| 1164 | |
| 1165 | /* get the complete sockaddr structure used in the data connection */ |
| 1166 | saddrlen = sizeof(struct sockaddr_storage); |
| 1167 | if (getsockname(sockdata, (struct sockaddr *) &saddr, &saddrlen) == -1) |
| 1168 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1169 | sock_geterror("getsockname()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1170 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1171 | } |
| 1172 | |
| 1173 | /* Get the local port the system picked up */ |
| 1174 | if (getnameinfo((struct sockaddr *) &saddr, saddrlen, NULL, |
| 1175 | 0, portdata, sizeof(portdata), NI_NUMERICSERV)) |
| 1176 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1177 | sock_geterror("getnameinfo()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1178 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1179 | } |
| 1180 | } |
| 1181 | |
| 1182 | /* |
| 1183 | * Now it's time to start playing with the RPCAP protocol |
| 1184 | * RPCAP start capture command: create the request message |
| 1185 | */ |
| 1186 | if (sock_bufferize(NULL, sizeof(struct rpcap_header), NULL, |
| 1187 | &sendbufidx, RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, fp->errbuf, PCAP_ERRBUF_SIZE)) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1188 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1189 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1190 | rpcap_createhdr((struct rpcap_header *) sendbuf, |
| 1191 | pr->protocol_version, RPCAP_MSG_STARTCAP_REQ, 0, |
| 1192 | sizeof(struct rpcap_startcapreq) + sizeof(struct rpcap_filter) + fp->fcode.bf_len * sizeof(struct rpcap_filterbpf_insn)); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1193 | |
| 1194 | /* Fill the structure needed to open an adapter remotely */ |
| 1195 | startcapreq = (struct rpcap_startcapreq *) &sendbuf[sendbufidx]; |
| 1196 | |
| 1197 | if (sock_bufferize(NULL, sizeof(struct rpcap_startcapreq), NULL, |
| 1198 | &sendbufidx, RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, fp->errbuf, PCAP_ERRBUF_SIZE)) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1199 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1200 | |
| 1201 | memset(startcapreq, 0, sizeof(struct rpcap_startcapreq)); |
| 1202 | |
| 1203 | /* By default, apply half the timeout on one side, half of the other */ |
| 1204 | fp->opt.timeout = fp->opt.timeout / 2; |
| 1205 | startcapreq->read_timeout = htonl(fp->opt.timeout); |
| 1206 | |
| 1207 | /* portdata on the openreq is meaningful only if we're in active mode */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1208 | if ((active) || (pr->rmt_flags & PCAP_OPENFLAG_DATATX_UDP)) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1209 | { |
| 1210 | sscanf(portdata, "%d", (int *)&(startcapreq->portdata)); /* cast to avoid a compiler warning */ |
| 1211 | startcapreq->portdata = htons(startcapreq->portdata); |
| 1212 | } |
| 1213 | |
| 1214 | startcapreq->snaplen = htonl(fp->snapshot); |
| 1215 | startcapreq->flags = 0; |
| 1216 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1217 | if (pr->rmt_flags & PCAP_OPENFLAG_PROMISCUOUS) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1218 | startcapreq->flags |= RPCAP_STARTCAPREQ_FLAG_PROMISC; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1219 | if (pr->rmt_flags & PCAP_OPENFLAG_DATATX_UDP) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1220 | startcapreq->flags |= RPCAP_STARTCAPREQ_FLAG_DGRAM; |
| 1221 | if (active) |
| 1222 | startcapreq->flags |= RPCAP_STARTCAPREQ_FLAG_SERVEROPEN; |
| 1223 | |
| 1224 | startcapreq->flags = htons(startcapreq->flags); |
| 1225 | |
| 1226 | /* Pack the capture filter */ |
| 1227 | if (pcap_pack_bpffilter(fp, &sendbuf[sendbufidx], &sendbufidx, &fp->fcode)) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1228 | goto error_nodiscard; |
| 1229 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1230 | if (sock_send(pr->rmt_sockctrl, pr->ctrl_ssl, sendbuf, sendbufidx, fp->errbuf, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1231 | PCAP_ERRBUF_SIZE) < 0) |
| 1232 | goto error_nodiscard; |
| 1233 | |
| 1234 | /* Receive and process the reply message header. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1235 | if (rpcap_process_msg_header(pr->rmt_sockctrl, pr->ctrl_ssl, pr->protocol_version, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1236 | RPCAP_MSG_STARTCAP_REQ, &header, fp->errbuf) == -1) |
| 1237 | goto error_nodiscard; |
| 1238 | |
| 1239 | plen = header.plen; |
| 1240 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1241 | if (rpcap_recv(pr->rmt_sockctrl, pr->ctrl_ssl, (char *)&startcapreply, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1242 | sizeof(struct rpcap_startcapreply), &plen, fp->errbuf) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1243 | goto error; |
| 1244 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1245 | /* |
| 1246 | * In case of UDP data stream, the connection is always opened by the daemon |
| 1247 | * So, this case is already covered by the code above. |
| 1248 | * Now, we have still to handle TCP connections, because: |
| 1249 | * - if we're in active mode, we have to wait for a remote connection |
| 1250 | * - if we're in passive more, we have to start a connection |
| 1251 | * |
| 1252 | * We have to do he job in two steps because in case we're opening a TCP connection, we have |
| 1253 | * to tell the port we're using to the remote side; in case we're accepting a TCP |
| 1254 | * connection, we have to wait this info from the remote side. |
| 1255 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1256 | if (!(pr->rmt_flags & PCAP_OPENFLAG_DATATX_UDP)) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1257 | { |
| 1258 | if (!active) |
| 1259 | { |
| 1260 | memset(&hints, 0, sizeof(struct addrinfo)); |
| 1261 | hints.ai_family = ai_family; /* Use the same address family of the control socket */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1262 | hints.ai_socktype = (pr->rmt_flags & PCAP_OPENFLAG_DATATX_UDP) ? SOCK_DGRAM : SOCK_STREAM; |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1263 | snprintf(portdata, PCAP_BUF_SIZE, "%d", ntohs(startcapreply.portdata)); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1264 | |
| 1265 | /* Let's the server pick up a free network port for us */ |
| 1266 | if (sock_initaddress(host, portdata, &hints, &addrinfo, fp->errbuf, PCAP_ERRBUF_SIZE) == -1) |
| 1267 | goto error; |
| 1268 | |
| 1269 | if ((sockdata = sock_open(addrinfo, SOCKOPEN_CLIENT, 0, fp->errbuf, PCAP_ERRBUF_SIZE)) == INVALID_SOCKET) |
| 1270 | goto error; |
| 1271 | |
| 1272 | /* addrinfo is no longer used */ |
| 1273 | freeaddrinfo(addrinfo); |
| 1274 | addrinfo = NULL; |
| 1275 | } |
| 1276 | else |
| 1277 | { |
| 1278 | SOCKET socktemp; /* We need another socket, since we're going to accept() a connection */ |
| 1279 | |
| 1280 | /* Connection creation */ |
| 1281 | saddrlen = sizeof(struct sockaddr_storage); |
| 1282 | |
| 1283 | socktemp = accept(sockdata, (struct sockaddr *) &saddr, &saddrlen); |
| 1284 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1285 | if (socktemp == INVALID_SOCKET) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1286 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1287 | sock_geterror("accept()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1288 | goto error; |
| 1289 | } |
| 1290 | |
| 1291 | /* Now that I accepted the connection, the server socket is no longer needed */ |
| 1292 | sock_close(sockdata, fp->errbuf, PCAP_ERRBUF_SIZE); |
| 1293 | sockdata = socktemp; |
| 1294 | } |
| 1295 | } |
| 1296 | |
| 1297 | /* Let's save the socket of the data connection */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1298 | pr->rmt_sockdata = sockdata; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1299 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1300 | #ifdef HAVE_OPENSSL |
| 1301 | if (pr->uses_ssl) |
| 1302 | { |
| 1303 | pr->data_ssl = ssl_promotion(0, sockdata, fp->errbuf, PCAP_ERRBUF_SIZE); |
| 1304 | if (! pr->data_ssl) goto error; |
| 1305 | } |
| 1306 | #endif |
| 1307 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1308 | /* |
| 1309 | * Set the size of the socket buffer for the data socket. |
| 1310 | * It has the same size as the local capture buffer used |
| 1311 | * on the other side of the connection. |
| 1312 | */ |
| 1313 | server_sockbufsize = ntohl(startcapreply.bufsize); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1314 | |
| 1315 | /* Let's get the actual size of the socket buffer */ |
| 1316 | itemp = sizeof(sockbufsize); |
| 1317 | |
| 1318 | res = getsockopt(sockdata, SOL_SOCKET, SO_RCVBUF, (char *)&sockbufsize, &itemp); |
| 1319 | if (res == -1) |
| 1320 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1321 | sock_geterror("pcap_startcapture_remote(): getsockopt() failed", fp->errbuf, PCAP_ERRBUF_SIZE); |
| 1322 | goto error; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1323 | } |
| 1324 | |
| 1325 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1326 | * Warning: on some kernels (e.g. Linux), the size of the user |
| 1327 | * buffer does not take into account the pcap_header and such, |
| 1328 | * and it is set equal to the snaplen. |
| 1329 | * |
| 1330 | * In my view, this is wrong (the meaning of the bufsize became |
| 1331 | * a bit strange). So, here bufsize is the whole size of the |
| 1332 | * user buffer. In case the bufsize returned is too small, |
| 1333 | * let's adjust it accordingly. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1334 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1335 | if (server_sockbufsize <= (u_int) fp->snapshot) |
| 1336 | server_sockbufsize += sizeof(struct pcap_pkthdr); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1337 | |
| 1338 | /* if the current socket buffer is smaller than the desired one */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1339 | if ((u_int) sockbufsize < server_sockbufsize) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1340 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1341 | /* |
| 1342 | * Loop until the buffer size is OK or the original |
| 1343 | * socket buffer size is larger than this one. |
| 1344 | */ |
| 1345 | for (;;) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1346 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1347 | res = setsockopt(sockdata, SOL_SOCKET, SO_RCVBUF, |
| 1348 | (char *)&(server_sockbufsize), |
| 1349 | sizeof(server_sockbufsize)); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1350 | |
| 1351 | if (res == 0) |
| 1352 | break; |
| 1353 | |
| 1354 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1355 | * If something goes wrong, halve the buffer size |
| 1356 | * (checking that it does not become smaller than |
| 1357 | * the current one). |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1358 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1359 | server_sockbufsize /= 2; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1360 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1361 | if ((u_int) sockbufsize >= server_sockbufsize) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1362 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1363 | server_sockbufsize = sockbufsize; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1364 | break; |
| 1365 | } |
| 1366 | } |
| 1367 | } |
| 1368 | |
| 1369 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1370 | * Let's allocate the packet; this is required in order to put |
| 1371 | * the packet somewhere when extracting data from the socket. |
| 1372 | * Since buffering has already been done in the socket buffer, |
| 1373 | * here we need just a buffer whose size is equal to the |
| 1374 | * largest possible packet message for the snapshot size, |
| 1375 | * namely the length of the message header plus the length |
| 1376 | * of the packet header plus the snapshot length. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1377 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1378 | fp->bufsize = sizeof(struct rpcap_header) + sizeof(struct rpcap_pkthdr) + fp->snapshot; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1379 | |
| 1380 | fp->buffer = (u_char *)malloc(fp->bufsize); |
| 1381 | if (fp->buffer == NULL) |
| 1382 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1383 | pcap_fmt_errmsg_for_errno(fp->errbuf, PCAP_ERRBUF_SIZE, |
| 1384 | errno, "malloc"); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1385 | goto error; |
| 1386 | } |
| 1387 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1388 | /* |
| 1389 | * The buffer is currently empty. |
| 1390 | */ |
| 1391 | fp->bp = fp->buffer; |
| 1392 | fp->cc = 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1393 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1394 | /* Discard the rest of the message. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1395 | if (rpcap_discard(pr->rmt_sockctrl, pr->ctrl_ssl, plen, fp->errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1396 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1397 | |
| 1398 | /* |
| 1399 | * In case the user does not want to capture RPCAP packets, let's update the filter |
| 1400 | * We have to update it here (instead of sending it into the 'StartCapture' message |
| 1401 | * because when we generate the 'start capture' we do not know (yet) all the ports |
| 1402 | * we're currently using. |
| 1403 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1404 | if (pr->rmt_flags & PCAP_OPENFLAG_NOCAPTURE_RPCAP) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1405 | { |
| 1406 | struct bpf_program fcode; |
| 1407 | |
| 1408 | if (pcap_createfilter_norpcappkt(fp, &fcode) == -1) |
| 1409 | goto error; |
| 1410 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1411 | /* We cannot use 'pcap_setfilter_rpcap' because formally the capture has not been started yet */ |
| 1412 | /* (the 'pr->rmt_capstarted' variable will be updated some lines below) */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1413 | if (pcap_updatefilter_remote(fp, &fcode) == -1) |
| 1414 | goto error; |
| 1415 | |
| 1416 | pcap_freecode(&fcode); |
| 1417 | } |
| 1418 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1419 | pr->rmt_capstarted = 1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1420 | return 0; |
| 1421 | |
| 1422 | error: |
| 1423 | /* |
| 1424 | * When the connection has been established, we have to close it. So, at the |
| 1425 | * beginning of this function, if an error occur we return immediately with |
| 1426 | * a return NULL; when the connection is established, we have to come here |
| 1427 | * ('goto error;') in order to close everything properly. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1428 | */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1429 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1430 | /* |
| 1431 | * Discard the rest of the message. |
| 1432 | * We already reported an error; if this gets an error, just |
| 1433 | * drive on. |
| 1434 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1435 | (void)rpcap_discard(pr->rmt_sockctrl, pr->ctrl_ssl, plen, NULL); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1436 | |
| 1437 | error_nodiscard: |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1438 | #ifdef HAVE_OPENSSL |
| 1439 | if (pr->data_ssl) |
| 1440 | { |
| 1441 | // Finish using the SSL handle for the data socket. |
| 1442 | // This must be done *before* the socket is closed. |
| 1443 | ssl_finish(pr->data_ssl); |
| 1444 | pr->data_ssl = NULL; |
| 1445 | } |
| 1446 | #endif |
| 1447 | |
| 1448 | /* we can be here because sockdata said 'error' */ |
| 1449 | if ((sockdata != 0) && (sockdata != INVALID_SOCKET)) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1450 | sock_close(sockdata, NULL, 0); |
| 1451 | |
| 1452 | if (!active) |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1453 | { |
| 1454 | #ifdef HAVE_OPENSSL |
| 1455 | if (pr->ctrl_ssl) |
| 1456 | { |
| 1457 | // Finish using the SSL handle for the control socket. |
| 1458 | // This must be done *before* the socket is closed. |
| 1459 | ssl_finish(pr->ctrl_ssl); |
| 1460 | pr->ctrl_ssl = NULL; |
| 1461 | } |
| 1462 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1463 | sock_close(pr->rmt_sockctrl, NULL, 0); |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1464 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1465 | |
| 1466 | if (addrinfo != NULL) |
| 1467 | freeaddrinfo(addrinfo); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1468 | |
| 1469 | /* |
| 1470 | * We do not have to call pcap_close() here, because this function is always called |
| 1471 | * by the user in case something bad happens |
| 1472 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1473 | #if 0 |
| 1474 | if (fp) |
| 1475 | { |
| 1476 | pcap_close(fp); |
| 1477 | fp= NULL; |
| 1478 | } |
| 1479 | #endif |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1480 | |
| 1481 | return -1; |
| 1482 | } |
| 1483 | |
| 1484 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1485 | * This function takes a bpf program and sends it to the other host. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1486 | * |
| 1487 | * This function can be called in two cases: |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1488 | * - pcap_startcapture_remote() is called (we have to send the filter |
| 1489 | * along with the 'start capture' command) |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1490 | * - we want to update the filter during a capture (i.e. pcap_setfilter() |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1491 | * after the capture has been started) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1492 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1493 | * This function serializes the filter into the sending buffer ('sendbuf', |
| 1494 | * passed as a parameter) and return back. It does not send anything on |
| 1495 | * the network. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1496 | * |
| 1497 | * \param fp: the pcap_t descriptor of the device currently opened. |
| 1498 | * |
| 1499 | * \param sendbuf: the buffer on which the serialized data has to copied. |
| 1500 | * |
| 1501 | * \param sendbufidx: it is used to return the abounf of bytes copied into the buffer. |
| 1502 | * |
| 1503 | * \param prog: the bpf program we have to copy. |
| 1504 | * |
| 1505 | * \return '0' if everything is fine, '-1' otherwise. The error message (if one) |
| 1506 | * is returned into the 'errbuf' field of the pcap_t structure. |
| 1507 | */ |
| 1508 | static int pcap_pack_bpffilter(pcap_t *fp, char *sendbuf, int *sendbufidx, struct bpf_program *prog) |
| 1509 | { |
| 1510 | struct rpcap_filter *filter; |
| 1511 | struct rpcap_filterbpf_insn *insn; |
| 1512 | struct bpf_insn *bf_insn; |
| 1513 | struct bpf_program fake_prog; /* To be used just in case the user forgot to set a filter */ |
| 1514 | unsigned int i; |
| 1515 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1516 | if (prog->bf_len == 0) /* No filters have been specified; so, let's apply a "fake" filter */ |
| 1517 | { |
| 1518 | if (pcap_compile(fp, &fake_prog, NULL /* buffer */, 1, 0) == -1) |
| 1519 | return -1; |
| 1520 | |
| 1521 | prog = &fake_prog; |
| 1522 | } |
| 1523 | |
| 1524 | filter = (struct rpcap_filter *) sendbuf; |
| 1525 | |
| 1526 | if (sock_bufferize(NULL, sizeof(struct rpcap_filter), NULL, sendbufidx, |
| 1527 | RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, fp->errbuf, PCAP_ERRBUF_SIZE)) |
| 1528 | return -1; |
| 1529 | |
| 1530 | filter->filtertype = htons(RPCAP_UPDATEFILTER_BPF); |
| 1531 | filter->nitems = htonl((int32)prog->bf_len); |
| 1532 | |
| 1533 | if (sock_bufferize(NULL, prog->bf_len * sizeof(struct rpcap_filterbpf_insn), |
| 1534 | NULL, sendbufidx, RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, fp->errbuf, PCAP_ERRBUF_SIZE)) |
| 1535 | return -1; |
| 1536 | |
| 1537 | insn = (struct rpcap_filterbpf_insn *) (filter + 1); |
| 1538 | bf_insn = prog->bf_insns; |
| 1539 | |
| 1540 | for (i = 0; i < prog->bf_len; i++) |
| 1541 | { |
| 1542 | insn->code = htons(bf_insn->code); |
| 1543 | insn->jf = bf_insn->jf; |
| 1544 | insn->jt = bf_insn->jt; |
| 1545 | insn->k = htonl(bf_insn->k); |
| 1546 | |
| 1547 | insn++; |
| 1548 | bf_insn++; |
| 1549 | } |
| 1550 | |
| 1551 | return 0; |
| 1552 | } |
| 1553 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1554 | /* |
| 1555 | * This function updates a filter on a remote host. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1556 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1557 | * It is called when the user wants to update a filter. |
| 1558 | * In case we're capturing from the network, it sends the filter to our |
| 1559 | * peer. |
| 1560 | * This function is *not* called automatically when the user calls |
| 1561 | * pcap_setfilter(). |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1562 | * There will be two cases: |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1563 | * - the capture has been started: in this case, pcap_setfilter_rpcap() |
| 1564 | * calls pcap_updatefilter_remote() |
| 1565 | * - the capture has not started yet: in this case, pcap_setfilter_rpcap() |
| 1566 | * stores the filter into the pcap_t structure, and then the filter is |
| 1567 | * sent with pcap_startcap(). |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1568 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1569 | * WARNING This function *does not* clear the packet currently into the |
| 1570 | * buffers. Therefore, the user has to expect to receive some packets |
| 1571 | * that are related to the previous filter. If you want to discard all |
| 1572 | * the packets before applying a new filter, you have to close the |
| 1573 | * current capture session and start a new one. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1574 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1575 | * XXX - we really should have pcap_setfilter() always discard packets |
| 1576 | * received with the old filter, and have a separate pcap_setfilter_noflush() |
| 1577 | * function that doesn't discard any packets. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1578 | */ |
| 1579 | static int pcap_updatefilter_remote(pcap_t *fp, struct bpf_program *prog) |
| 1580 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1581 | struct pcap_rpcap *pr = fp->priv; /* structure used when doing a remote live capture */ |
| 1582 | char sendbuf[RPCAP_NETBUF_SIZE]; /* temporary buffer in which data to be sent is buffered */ |
| 1583 | int sendbufidx = 0; /* index which keeps the number of bytes currently buffered */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1584 | struct rpcap_header header; /* To keep the reply message */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1585 | |
| 1586 | if (sock_bufferize(NULL, sizeof(struct rpcap_header), NULL, &sendbufidx, |
| 1587 | RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, fp->errbuf, PCAP_ERRBUF_SIZE)) |
| 1588 | return -1; |
| 1589 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1590 | rpcap_createhdr((struct rpcap_header *) sendbuf, |
| 1591 | pr->protocol_version, RPCAP_MSG_UPDATEFILTER_REQ, 0, |
| 1592 | sizeof(struct rpcap_filter) + prog->bf_len * sizeof(struct rpcap_filterbpf_insn)); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1593 | |
| 1594 | if (pcap_pack_bpffilter(fp, &sendbuf[sendbufidx], &sendbufidx, prog)) |
| 1595 | return -1; |
| 1596 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1597 | if (sock_send(pr->rmt_sockctrl, pr->ctrl_ssl, sendbuf, sendbufidx, fp->errbuf, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1598 | PCAP_ERRBUF_SIZE) < 0) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1599 | return -1; |
| 1600 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1601 | /* Receive and process the reply message header. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1602 | if (rpcap_process_msg_header(pr->rmt_sockctrl, pr->ctrl_ssl, pr->protocol_version, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1603 | RPCAP_MSG_UPDATEFILTER_REQ, &header, fp->errbuf) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1604 | return -1; |
| 1605 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1606 | /* |
| 1607 | * It shouldn't have any contents; discard it if it does. |
| 1608 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1609 | if (rpcap_discard(pr->rmt_sockctrl, pr->ctrl_ssl, header.plen, fp->errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1610 | return -1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1611 | |
| 1612 | return 0; |
| 1613 | } |
| 1614 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1615 | static void |
| 1616 | pcap_save_current_filter_rpcap(pcap_t *fp, const char *filter) |
| 1617 | { |
| 1618 | struct pcap_rpcap *pr = fp->priv; /* structure used when doing a remote live capture */ |
| 1619 | |
| 1620 | /* |
| 1621 | * Check if: |
| 1622 | * - We are on an remote capture |
| 1623 | * - we do not want to capture RPCAP traffic |
| 1624 | * |
| 1625 | * If so, we have to save the current filter, because we have to |
| 1626 | * add some piece of stuff later |
| 1627 | */ |
| 1628 | if (pr->rmt_clientside && |
| 1629 | (pr->rmt_flags & PCAP_OPENFLAG_NOCAPTURE_RPCAP)) |
| 1630 | { |
| 1631 | if (pr->currentfilter) |
| 1632 | free(pr->currentfilter); |
| 1633 | |
| 1634 | if (filter == NULL) |
| 1635 | filter = ""; |
| 1636 | |
| 1637 | pr->currentfilter = strdup(filter); |
| 1638 | } |
| 1639 | } |
| 1640 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1641 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1642 | * This function sends a filter to a remote host. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1643 | * |
| 1644 | * This function is called when the user wants to set a filter. |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1645 | * It sends the filter to our peer. |
| 1646 | * This function is called automatically when the user calls pcap_setfilter(). |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1647 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1648 | * Parameters and return values are exactly the same of pcap_setfilter(). |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1649 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1650 | static int pcap_setfilter_rpcap(pcap_t *fp, struct bpf_program *prog) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1651 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1652 | struct pcap_rpcap *pr = fp->priv; /* structure used when doing a remote live capture */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1653 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1654 | if (!pr->rmt_capstarted) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1655 | { |
| 1656 | /* copy filter into the pcap_t structure */ |
| 1657 | if (install_bpf_program(fp, prog) == -1) |
| 1658 | return -1; |
| 1659 | return 0; |
| 1660 | } |
| 1661 | |
| 1662 | /* we have to update a filter during run-time */ |
| 1663 | if (pcap_updatefilter_remote(fp, prog)) |
| 1664 | return -1; |
| 1665 | |
| 1666 | return 0; |
| 1667 | } |
| 1668 | |
| 1669 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1670 | * This function updates the current filter in order not to capture rpcap |
| 1671 | * packets. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1672 | * |
| 1673 | * This function is called *only* when the user wants exclude RPCAP packets |
| 1674 | * related to the current session from the captured packets. |
| 1675 | * |
| 1676 | * \return '0' if everything is fine, '-1' otherwise. The error message (if one) |
| 1677 | * is returned into the 'errbuf' field of the pcap_t structure. |
| 1678 | */ |
| 1679 | static int pcap_createfilter_norpcappkt(pcap_t *fp, struct bpf_program *prog) |
| 1680 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1681 | struct pcap_rpcap *pr = fp->priv; /* structure used when doing a remote live capture */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1682 | int RetVal = 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1683 | |
| 1684 | /* We do not want to capture our RPCAP traffic. So, let's update the filter */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1685 | if (pr->rmt_flags & PCAP_OPENFLAG_NOCAPTURE_RPCAP) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1686 | { |
| 1687 | struct sockaddr_storage saddr; /* temp, needed to retrieve the network data port chosen on the local machine */ |
| 1688 | socklen_t saddrlen; /* temp, needed to retrieve the network data port chosen on the local machine */ |
| 1689 | char myaddress[128]; |
| 1690 | char myctrlport[128]; |
| 1691 | char mydataport[128]; |
| 1692 | char peeraddress[128]; |
| 1693 | char peerctrlport[128]; |
| 1694 | char *newfilter; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1695 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1696 | /* Get the name/port of our peer */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1697 | saddrlen = sizeof(struct sockaddr_storage); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1698 | if (getpeername(pr->rmt_sockctrl, (struct sockaddr *) &saddr, &saddrlen) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1699 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1700 | sock_geterror("getpeername()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1701 | return -1; |
| 1702 | } |
| 1703 | |
| 1704 | if (getnameinfo((struct sockaddr *) &saddr, saddrlen, peeraddress, |
| 1705 | sizeof(peeraddress), peerctrlport, sizeof(peerctrlport), NI_NUMERICHOST | NI_NUMERICSERV)) |
| 1706 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1707 | sock_geterror("getnameinfo()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1708 | return -1; |
| 1709 | } |
| 1710 | |
| 1711 | /* We cannot check the data port, because this is available only in case of TCP sockets */ |
| 1712 | /* Get the name/port of the current host */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1713 | if (getsockname(pr->rmt_sockctrl, (struct sockaddr *) &saddr, &saddrlen) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1714 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1715 | sock_geterror("getsockname()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1716 | return -1; |
| 1717 | } |
| 1718 | |
| 1719 | /* Get the local port the system picked up */ |
| 1720 | if (getnameinfo((struct sockaddr *) &saddr, saddrlen, myaddress, |
| 1721 | sizeof(myaddress), myctrlport, sizeof(myctrlport), NI_NUMERICHOST | NI_NUMERICSERV)) |
| 1722 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1723 | sock_geterror("getnameinfo()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1724 | return -1; |
| 1725 | } |
| 1726 | |
| 1727 | /* Let's now check the data port */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1728 | if (getsockname(pr->rmt_sockdata, (struct sockaddr *) &saddr, &saddrlen) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1729 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1730 | sock_geterror("getsockname()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1731 | return -1; |
| 1732 | } |
| 1733 | |
| 1734 | /* Get the local port the system picked up */ |
| 1735 | if (getnameinfo((struct sockaddr *) &saddr, saddrlen, NULL, 0, mydataport, sizeof(mydataport), NI_NUMERICSERV)) |
| 1736 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1737 | sock_geterror("getnameinfo()", fp->errbuf, PCAP_ERRBUF_SIZE); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1738 | return -1; |
| 1739 | } |
| 1740 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1741 | if (pr->currentfilter && pr->currentfilter[0] != '\0') |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1742 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1743 | /* |
| 1744 | * We have a current filter; add items to it to |
| 1745 | * filter out this rpcap session. |
| 1746 | */ |
| 1747 | if (pcap_asprintf(&newfilter, |
| 1748 | "(%s) and not (host %s and host %s and port %s and port %s) and not (host %s and host %s and port %s)", |
| 1749 | pr->currentfilter, myaddress, peeraddress, |
| 1750 | myctrlport, peerctrlport, myaddress, peeraddress, |
| 1751 | mydataport) == -1) |
| 1752 | { |
| 1753 | /* Failed. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1754 | snprintf(fp->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1755 | "Can't allocate memory for new filter"); |
| 1756 | return -1; |
| 1757 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1758 | } |
| 1759 | else |
| 1760 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1761 | /* |
| 1762 | * We have no current filter; construct a filter to |
| 1763 | * filter out this rpcap session. |
| 1764 | */ |
| 1765 | if (pcap_asprintf(&newfilter, |
| 1766 | "not (host %s and host %s and port %s and port %s) and not (host %s and host %s and port %s)", |
| 1767 | myaddress, peeraddress, myctrlport, peerctrlport, |
| 1768 | myaddress, peeraddress, mydataport) == -1) |
| 1769 | { |
| 1770 | /* Failed. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1771 | snprintf(fp->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1772 | "Can't allocate memory for new filter"); |
| 1773 | return -1; |
| 1774 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1775 | } |
| 1776 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1777 | /* |
| 1778 | * This is only an hack to prevent the save_current_filter |
| 1779 | * routine, which will be called when we call pcap_compile(), |
| 1780 | * from saving the modified filter. |
| 1781 | */ |
| 1782 | pr->rmt_clientside = 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1783 | |
| 1784 | if (pcap_compile(fp, prog, newfilter, 1, 0) == -1) |
| 1785 | RetVal = -1; |
| 1786 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1787 | /* Undo the hack. */ |
| 1788 | pr->rmt_clientside = 1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1789 | |
| 1790 | free(newfilter); |
| 1791 | } |
| 1792 | |
| 1793 | return RetVal; |
| 1794 | } |
| 1795 | |
| 1796 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1797 | * This function sets sampling parameters in the remote host. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1798 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1799 | * It is called when the user wants to set activate sampling on the |
| 1800 | * remote host. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1801 | * |
| 1802 | * Sampling parameters are defined into the 'pcap_t' structure. |
| 1803 | * |
| 1804 | * \param p: the pcap_t descriptor of the device currently opened. |
| 1805 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1806 | * \return '0' if everything is OK, '-1' is something goes wrong. The |
| 1807 | * error message is returned in the 'errbuf' member of the pcap_t structure. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1808 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1809 | static int pcap_setsampling_remote(pcap_t *fp) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1810 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1811 | struct pcap_rpcap *pr = fp->priv; /* structure used when doing a remote live capture */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1812 | char sendbuf[RPCAP_NETBUF_SIZE];/* temporary buffer in which data to be sent is buffered */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1813 | int sendbufidx = 0; /* index which keeps the number of bytes currently buffered */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1814 | struct rpcap_header header; /* To keep the reply message */ |
| 1815 | struct rpcap_sampling *sampling_pars; /* Structure that is needed to send sampling parameters to the remote host */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1816 | |
| 1817 | /* If no samping is requested, return 'ok' */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1818 | if (fp->rmt_samp.method == PCAP_SAMP_NOSAMP) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1819 | return 0; |
| 1820 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1821 | /* |
| 1822 | * Check for sampling parameters that don't fit in a message. |
| 1823 | * We'll let the server complain about invalid parameters |
| 1824 | * that do fit into the message. |
| 1825 | */ |
| 1826 | if (fp->rmt_samp.method < 0 || fp->rmt_samp.method > 255) { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1827 | snprintf(fp->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1828 | "Invalid sampling method %d", fp->rmt_samp.method); |
| 1829 | return -1; |
| 1830 | } |
| 1831 | if (fp->rmt_samp.value < 0 || fp->rmt_samp.value > 65535) { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1832 | snprintf(fp->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1833 | "Invalid sampling value %d", fp->rmt_samp.value); |
| 1834 | return -1; |
| 1835 | } |
| 1836 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1837 | if (sock_bufferize(NULL, sizeof(struct rpcap_header), NULL, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1838 | &sendbufidx, RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, fp->errbuf, PCAP_ERRBUF_SIZE)) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1839 | return -1; |
| 1840 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1841 | rpcap_createhdr((struct rpcap_header *) sendbuf, |
| 1842 | pr->protocol_version, RPCAP_MSG_SETSAMPLING_REQ, 0, |
| 1843 | sizeof(struct rpcap_sampling)); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1844 | |
| 1845 | /* Fill the structure needed to open an adapter remotely */ |
| 1846 | sampling_pars = (struct rpcap_sampling *) &sendbuf[sendbufidx]; |
| 1847 | |
| 1848 | if (sock_bufferize(NULL, sizeof(struct rpcap_sampling), NULL, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1849 | &sendbufidx, RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, fp->errbuf, PCAP_ERRBUF_SIZE)) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1850 | return -1; |
| 1851 | |
| 1852 | memset(sampling_pars, 0, sizeof(struct rpcap_sampling)); |
| 1853 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1854 | sampling_pars->method = (uint8)fp->rmt_samp.method; |
| 1855 | sampling_pars->value = (uint16)htonl(fp->rmt_samp.value); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1856 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1857 | if (sock_send(pr->rmt_sockctrl, pr->ctrl_ssl, sendbuf, sendbufidx, fp->errbuf, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1858 | PCAP_ERRBUF_SIZE) < 0) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1859 | return -1; |
| 1860 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1861 | /* Receive and process the reply message header. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1862 | if (rpcap_process_msg_header(pr->rmt_sockctrl, pr->ctrl_ssl, pr->protocol_version, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1863 | RPCAP_MSG_SETSAMPLING_REQ, &header, fp->errbuf) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1864 | return -1; |
| 1865 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1866 | /* |
| 1867 | * It shouldn't have any contents; discard it if it does. |
| 1868 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1869 | if (rpcap_discard(pr->rmt_sockctrl, pr->ctrl_ssl, header.plen, fp->errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1870 | return -1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1871 | |
| 1872 | return 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1873 | } |
| 1874 | |
| 1875 | /********************************************************* |
| 1876 | * * |
| 1877 | * Miscellaneous functions * |
| 1878 | * * |
| 1879 | *********************************************************/ |
| 1880 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1881 | /* |
| 1882 | * This function performs authentication and protocol version |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1883 | * negotiation. It is required in order to open the connection |
| 1884 | * with the other end party. |
| 1885 | * |
| 1886 | * It sends authentication parameters on the control socket and |
| 1887 | * reads the reply. If the reply is a success indication, it |
| 1888 | * checks whether the reply includes minimum and maximum supported |
| 1889 | * versions from the server; if not, it assumes both are 0, as |
| 1890 | * that means it's an older server that doesn't return supported |
| 1891 | * version numbers in authentication replies, so it only supports |
| 1892 | * version 0. It then tries to determine the maximum version |
| 1893 | * supported both by us and by the server. If it can find such a |
| 1894 | * version, it sets us up to use that version; otherwise, it fails, |
| 1895 | * indicating that there is no version supported by us and by the |
| 1896 | * server. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1897 | * |
| 1898 | * \param sock: the socket we are currently using. |
| 1899 | * |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1900 | * \param ver: pointer to variable to which to set the protocol version |
| 1901 | * number we selected. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1902 | * |
| 1903 | * \param auth: authentication parameters that have to be sent. |
| 1904 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1905 | * \param errbuf: a pointer to a user-allocated buffer (of size |
| 1906 | * PCAP_ERRBUF_SIZE) that will contain the error message (in case there |
| 1907 | * is one). It could be a network problem or the fact that the authorization |
| 1908 | * failed. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1909 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1910 | * \return '0' if everything is fine, '-1' for an error. For errors, |
| 1911 | * an error message string is returned in the 'errbuf' variable. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1912 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1913 | static int rpcap_doauth(SOCKET sockctrl, SSL *ssl, uint8 *ver, struct pcap_rmtauth *auth, char *errbuf) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1914 | { |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1915 | char sendbuf[RPCAP_NETBUF_SIZE]; /* temporary buffer in which data that has to be sent is buffered */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1916 | int sendbufidx = 0; /* index which keeps the number of bytes currently buffered */ |
| 1917 | uint16 length; /* length of the payload of this message */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1918 | struct rpcap_auth *rpauth; |
| 1919 | uint16 auth_type; |
| 1920 | struct rpcap_header header; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1921 | size_t str_length; |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1922 | uint32 plen; |
| 1923 | struct rpcap_authreply authreply; /* authentication reply message */ |
| 1924 | uint8 ourvers; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1925 | |
| 1926 | if (auth) |
| 1927 | { |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1928 | switch (auth->type) |
| 1929 | { |
| 1930 | case RPCAP_RMTAUTH_NULL: |
| 1931 | length = sizeof(struct rpcap_auth); |
| 1932 | break; |
| 1933 | |
| 1934 | case RPCAP_RMTAUTH_PWD: |
| 1935 | length = sizeof(struct rpcap_auth); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1936 | if (auth->username) |
| 1937 | { |
| 1938 | str_length = strlen(auth->username); |
| 1939 | if (str_length > 65535) |
| 1940 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1941 | snprintf(errbuf, PCAP_ERRBUF_SIZE, "User name is too long (> 65535 bytes)"); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1942 | return -1; |
| 1943 | } |
| 1944 | length += (uint16)str_length; |
| 1945 | } |
| 1946 | if (auth->password) |
| 1947 | { |
| 1948 | str_length = strlen(auth->password); |
| 1949 | if (str_length > 65535) |
| 1950 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1951 | snprintf(errbuf, PCAP_ERRBUF_SIZE, "Password is too long (> 65535 bytes)"); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1952 | return -1; |
| 1953 | } |
| 1954 | length += (uint16)str_length; |
| 1955 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1956 | break; |
| 1957 | |
| 1958 | default: |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 1959 | snprintf(errbuf, PCAP_ERRBUF_SIZE, "Authentication type not recognized."); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1960 | return -1; |
| 1961 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1962 | |
| 1963 | auth_type = (uint16)auth->type; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1964 | } |
| 1965 | else |
| 1966 | { |
| 1967 | auth_type = RPCAP_RMTAUTH_NULL; |
| 1968 | length = sizeof(struct rpcap_auth); |
| 1969 | } |
| 1970 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1971 | if (sock_bufferize(NULL, sizeof(struct rpcap_header), NULL, |
| 1972 | &sendbufidx, RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, errbuf, PCAP_ERRBUF_SIZE)) |
| 1973 | return -1; |
| 1974 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 1975 | rpcap_createhdr((struct rpcap_header *) sendbuf, 0, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1976 | RPCAP_MSG_AUTH_REQ, 0, length); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1977 | |
| 1978 | rpauth = (struct rpcap_auth *) &sendbuf[sendbufidx]; |
| 1979 | |
| 1980 | if (sock_bufferize(NULL, sizeof(struct rpcap_auth), NULL, |
| 1981 | &sendbufidx, RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, errbuf, PCAP_ERRBUF_SIZE)) |
| 1982 | return -1; |
| 1983 | |
| 1984 | memset(rpauth, 0, sizeof(struct rpcap_auth)); |
| 1985 | |
| 1986 | rpauth->type = htons(auth_type); |
| 1987 | |
| 1988 | if (auth_type == RPCAP_RMTAUTH_PWD) |
| 1989 | { |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1990 | if (auth->username) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 1991 | rpauth->slen1 = (uint16)strlen(auth->username); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 1992 | else |
| 1993 | rpauth->slen1 = 0; |
| 1994 | |
| 1995 | if (sock_bufferize(auth->username, rpauth->slen1, sendbuf, |
| 1996 | &sendbufidx, RPCAP_NETBUF_SIZE, SOCKBUF_BUFFERIZE, errbuf, PCAP_ERRBUF_SIZE)) |
| 1997 | return -1; |
| 1998 | |
| 1999 | if (auth->password) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2000 | rpauth->slen2 = (uint16)strlen(auth->password); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2001 | else |
| 2002 | rpauth->slen2 = 0; |
| 2003 | |
| 2004 | if (sock_bufferize(auth->password, rpauth->slen2, sendbuf, |
| 2005 | &sendbufidx, RPCAP_NETBUF_SIZE, SOCKBUF_BUFFERIZE, errbuf, PCAP_ERRBUF_SIZE)) |
| 2006 | return -1; |
| 2007 | |
| 2008 | rpauth->slen1 = htons(rpauth->slen1); |
| 2009 | rpauth->slen2 = htons(rpauth->slen2); |
| 2010 | } |
| 2011 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2012 | if (sock_send(sockctrl, ssl, sendbuf, sendbufidx, errbuf, |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2013 | PCAP_ERRBUF_SIZE) < 0) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2014 | return -1; |
| 2015 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2016 | /* Receive and process the reply message header */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2017 | if (rpcap_process_msg_header(sockctrl, ssl, 0, RPCAP_MSG_AUTH_REQ, |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2018 | &header, errbuf) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2019 | return -1; |
| 2020 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2021 | /* |
| 2022 | * OK, it's an authentication reply, so we're logged in. |
| 2023 | * |
| 2024 | * Did it send any additional information? |
| 2025 | */ |
| 2026 | plen = header.plen; |
| 2027 | if (plen != 0) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2028 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2029 | /* Yes - is it big enough to be version information? */ |
| 2030 | if (plen < sizeof(struct rpcap_authreply)) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2031 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2032 | /* No - discard it and fail. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2033 | (void)rpcap_discard(sockctrl, ssl, plen, NULL); |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2034 | return -1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2035 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2036 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2037 | /* Read the reply body */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2038 | if (rpcap_recv(sockctrl, ssl, (char *)&authreply, |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2039 | sizeof(struct rpcap_authreply), &plen, errbuf) == -1) |
| 2040 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2041 | (void)rpcap_discard(sockctrl, ssl, plen, NULL); |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2042 | return -1; |
| 2043 | } |
| 2044 | |
| 2045 | /* Discard the rest of the message, if there is any. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2046 | if (rpcap_discard(sockctrl, ssl, plen, errbuf) == -1) |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2047 | return -1; |
| 2048 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2049 | /* |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2050 | * Check the minimum and maximum versions for sanity; |
| 2051 | * the minimum must be <= the maximum. |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2052 | */ |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2053 | if (authreply.minvers > authreply.maxvers) |
| 2054 | { |
| 2055 | /* |
| 2056 | * Bogus - give up on this server. |
| 2057 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2058 | snprintf(errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2059 | "The server's minimum supported protocol version is greater than its maximum supported protocol version"); |
| 2060 | return -1; |
| 2061 | } |
| 2062 | } |
| 2063 | else |
| 2064 | { |
| 2065 | /* No - it supports only version 0. */ |
| 2066 | authreply.minvers = 0; |
| 2067 | authreply.maxvers = 0; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2068 | } |
| 2069 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2070 | /* |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2071 | * OK, let's start with the maximum version the server supports. |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2072 | */ |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2073 | ourvers = authreply.maxvers; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2074 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2075 | #if RPCAP_MIN_VERSION != 0 |
| 2076 | /* |
| 2077 | * If that's less than the minimum version we support, we |
| 2078 | * can't communicate. |
| 2079 | */ |
| 2080 | if (ourvers < RPCAP_MIN_VERSION) |
| 2081 | goto novers; |
| 2082 | #endif |
| 2083 | |
| 2084 | /* |
| 2085 | * If that's greater than the maximum version we support, |
| 2086 | * choose the maximum version we support. |
| 2087 | */ |
| 2088 | if (ourvers > RPCAP_MAX_VERSION) |
| 2089 | { |
| 2090 | ourvers = RPCAP_MAX_VERSION; |
| 2091 | |
| 2092 | /* |
| 2093 | * If that's less than the minimum version they |
| 2094 | * support, we can't communicate. |
| 2095 | */ |
| 2096 | if (ourvers < authreply.minvers) |
| 2097 | goto novers; |
| 2098 | } |
| 2099 | |
| 2100 | *ver = ourvers; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2101 | return 0; |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2102 | |
| 2103 | novers: |
| 2104 | /* |
| 2105 | * There is no version we both support; that is a fatal error. |
| 2106 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2107 | snprintf(errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2108 | "The server doesn't support any protocol version that we support"); |
| 2109 | return -1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2110 | } |
| 2111 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2112 | /* We don't currently support non-blocking mode. */ |
| 2113 | static int |
| 2114 | pcap_getnonblock_rpcap(pcap_t *p) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2115 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2116 | snprintf(p->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2117 | "Non-blocking mode isn't supported for capturing remotely with rpcap"); |
| 2118 | return (-1); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2119 | } |
| 2120 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2121 | static int |
| 2122 | pcap_setnonblock_rpcap(pcap_t *p, int nonblock _U_) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2123 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2124 | snprintf(p->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2125 | "Non-blocking mode isn't supported for capturing remotely with rpcap"); |
| 2126 | return (-1); |
| 2127 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2128 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2129 | static int |
| 2130 | rpcap_setup_session(const char *source, struct pcap_rmtauth *auth, |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2131 | int *activep, SOCKET *sockctrlp, uint8 *uses_sslp, SSL **sslp, |
| 2132 | int rmt_flags, uint8 *protocol_versionp, char *host, char *port, |
| 2133 | char *iface, char *errbuf) |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2134 | { |
| 2135 | int type; |
| 2136 | struct activehosts *activeconn; /* active connection, if there is one */ |
| 2137 | int error; /* 1 if rpcap_remoteact_getsock got an error */ |
| 2138 | |
| 2139 | /* |
| 2140 | * Determine the type of the source (NULL, file, local, remote). |
| 2141 | * You must have a valid source string even if we're in active mode, |
| 2142 | * because otherwise the call to the following function will fail. |
| 2143 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2144 | if (pcap_parsesrcstr_ex(source, &type, host, port, iface, uses_sslp, |
| 2145 | errbuf) == -1) |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2146 | return -1; |
| 2147 | |
| 2148 | /* |
| 2149 | * It must be remote. |
| 2150 | */ |
| 2151 | if (type != PCAP_SRC_IFREMOTE) |
| 2152 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2153 | snprintf(errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2154 | "Non-remote interface passed to remote capture routine"); |
| 2155 | return -1; |
| 2156 | } |
| 2157 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2158 | /* |
| 2159 | * We don't yet support DTLS, so if the user asks for a TLS |
| 2160 | * connection and asks for data packets to be sent over UDP, |
| 2161 | * we have to give up. |
| 2162 | */ |
| 2163 | if (*uses_sslp && (rmt_flags & PCAP_OPENFLAG_DATATX_UDP)) |
| 2164 | { |
| 2165 | snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 2166 | "TLS not supported with UDP forward of remote packets"); |
| 2167 | return -1; |
| 2168 | } |
| 2169 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2170 | /* Warning: this call can be the first one called by the user. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2171 | /* For this reason, we have to initialize the Winsock support. */ |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2172 | if (sock_init(errbuf, PCAP_ERRBUF_SIZE) == -1) |
| 2173 | return -1; |
| 2174 | |
| 2175 | /* Check for active mode */ |
| 2176 | activeconn = rpcap_remoteact_getsock(host, &error, errbuf); |
| 2177 | if (activeconn != NULL) |
| 2178 | { |
| 2179 | *activep = 1; |
| 2180 | *sockctrlp = activeconn->sockctrl; |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2181 | *sslp = activeconn->ssl; |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2182 | *protocol_versionp = activeconn->protocol_version; |
| 2183 | } |
| 2184 | else |
| 2185 | { |
| 2186 | *activep = 0; |
| 2187 | struct addrinfo hints; /* temp variable needed to resolve hostnames into to socket representation */ |
| 2188 | struct addrinfo *addrinfo; /* temp variable needed to resolve hostnames into to socket representation */ |
| 2189 | |
| 2190 | if (error) |
| 2191 | { |
| 2192 | /* |
| 2193 | * Call failed. |
| 2194 | */ |
| 2195 | return -1; |
| 2196 | } |
| 2197 | |
| 2198 | /* |
| 2199 | * We're not in active mode; let's try to open a new |
| 2200 | * control connection. |
| 2201 | */ |
| 2202 | memset(&hints, 0, sizeof(struct addrinfo)); |
| 2203 | hints.ai_family = PF_UNSPEC; |
| 2204 | hints.ai_socktype = SOCK_STREAM; |
| 2205 | |
| 2206 | if (port[0] == 0) |
| 2207 | { |
| 2208 | /* the user chose not to specify the port */ |
| 2209 | if (sock_initaddress(host, RPCAP_DEFAULT_NETPORT, |
| 2210 | &hints, &addrinfo, errbuf, PCAP_ERRBUF_SIZE) == -1) |
| 2211 | return -1; |
| 2212 | } |
| 2213 | else |
| 2214 | { |
| 2215 | if (sock_initaddress(host, port, &hints, &addrinfo, |
| 2216 | errbuf, PCAP_ERRBUF_SIZE) == -1) |
| 2217 | return -1; |
| 2218 | } |
| 2219 | |
| 2220 | if ((*sockctrlp = sock_open(addrinfo, SOCKOPEN_CLIENT, 0, |
| 2221 | errbuf, PCAP_ERRBUF_SIZE)) == INVALID_SOCKET) |
| 2222 | { |
| 2223 | freeaddrinfo(addrinfo); |
| 2224 | return -1; |
| 2225 | } |
| 2226 | |
| 2227 | /* addrinfo is no longer used */ |
| 2228 | freeaddrinfo(addrinfo); |
| 2229 | addrinfo = NULL; |
| 2230 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2231 | if (*uses_sslp) |
| 2232 | { |
| 2233 | #ifdef HAVE_OPENSSL |
| 2234 | *sslp = ssl_promotion(0, *sockctrlp, errbuf, |
| 2235 | PCAP_ERRBUF_SIZE); |
| 2236 | if (!*sslp) |
| 2237 | { |
| 2238 | sock_close(*sockctrlp, NULL, 0); |
| 2239 | return -1; |
| 2240 | } |
| 2241 | #else |
| 2242 | snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 2243 | "No TLS support"); |
| 2244 | sock_close(*sockctrlp, NULL, 0); |
| 2245 | return -1; |
| 2246 | #endif |
| 2247 | } |
| 2248 | |
| 2249 | if (rpcap_doauth(*sockctrlp, *sslp, protocol_versionp, auth, |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2250 | errbuf) == -1) |
| 2251 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2252 | #ifdef HAVE_OPENSSL |
| 2253 | if (*sslp) |
| 2254 | { |
| 2255 | // Finish using the SSL handle for the socket. |
| 2256 | // This must be done *before* the socket is |
| 2257 | // closed. |
| 2258 | ssl_finish(*sslp); |
| 2259 | } |
| 2260 | #endif |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2261 | sock_close(*sockctrlp, NULL, 0); |
| 2262 | return -1; |
| 2263 | } |
| 2264 | } |
| 2265 | return 0; |
| 2266 | } |
| 2267 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2268 | /* |
| 2269 | * This function opens a remote adapter by opening an RPCAP connection and |
| 2270 | * so on. |
| 2271 | * |
| 2272 | * It does the job of pcap_open_live() for a remote interface; it's called |
| 2273 | * by pcap_open() for remote interfaces. |
| 2274 | * |
| 2275 | * We do not start the capture until pcap_startcapture_remote() is called. |
| 2276 | * |
| 2277 | * This is because, when doing a remote capture, we cannot start capturing |
| 2278 | * data as soon as the 'open adapter' command is sent. Suppose the remote |
| 2279 | * adapter is already overloaded; if we start a capture (which, by default, |
| 2280 | * has a NULL filter) the new traffic can saturate the network. |
| 2281 | * |
| 2282 | * Instead, we want to "open" the adapter, then send a "start capture" |
| 2283 | * command only when we're ready to start the capture. |
| 2284 | * This function does this job: it sends an "open adapter" command |
| 2285 | * (according to the RPCAP protocol), but it does not start the capture. |
| 2286 | * |
| 2287 | * Since the other libpcap functions do not share this way of life, we |
| 2288 | * have to do some dirty things in order to make everything work. |
| 2289 | * |
| 2290 | * \param source: see pcap_open(). |
| 2291 | * \param snaplen: see pcap_open(). |
| 2292 | * \param flags: see pcap_open(). |
| 2293 | * \param read_timeout: see pcap_open(). |
| 2294 | * \param auth: see pcap_open(). |
| 2295 | * \param errbuf: see pcap_open(). |
| 2296 | * |
| 2297 | * \return a pcap_t pointer in case of success, NULL otherwise. In case of |
| 2298 | * success, the pcap_t pointer can be used as a parameter to the following |
| 2299 | * calls (pcap_compile() and so on). In case of problems, errbuf contains |
| 2300 | * a text explanation of error. |
| 2301 | * |
| 2302 | * WARNING: In case we call pcap_compile() and the capture has not yet |
| 2303 | * been started, the filter will be saved into the pcap_t structure, |
| 2304 | * and it will be sent to the other host later (when |
| 2305 | * pcap_startcapture_remote() is called). |
| 2306 | */ |
| 2307 | pcap_t *pcap_open_rpcap(const char *source, int snaplen, int flags, int read_timeout, struct pcap_rmtauth *auth, char *errbuf) |
| 2308 | { |
| 2309 | pcap_t *fp; |
| 2310 | char *source_str; |
| 2311 | struct pcap_rpcap *pr; /* structure used when doing a remote live capture */ |
| 2312 | char host[PCAP_BUF_SIZE], ctrlport[PCAP_BUF_SIZE], iface[PCAP_BUF_SIZE]; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2313 | SOCKET sockctrl; |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2314 | SSL *ssl = NULL; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2315 | uint8 protocol_version; /* negotiated protocol version */ |
| 2316 | int active; |
| 2317 | uint32 plen; |
| 2318 | char sendbuf[RPCAP_NETBUF_SIZE]; /* temporary buffer in which data to be sent is buffered */ |
| 2319 | int sendbufidx = 0; /* index which keeps the number of bytes currently buffered */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2320 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2321 | /* RPCAP-related variables */ |
| 2322 | struct rpcap_header header; /* header of the RPCAP packet */ |
| 2323 | struct rpcap_openreply openreply; /* open reply message */ |
| 2324 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2325 | fp = PCAP_CREATE_COMMON(errbuf, struct pcap_rpcap); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2326 | if (fp == NULL) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2327 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2328 | return NULL; |
| 2329 | } |
| 2330 | source_str = strdup(source); |
| 2331 | if (source_str == NULL) { |
| 2332 | pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, |
| 2333 | errno, "malloc"); |
| 2334 | return NULL; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2335 | } |
| 2336 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2337 | /* |
| 2338 | * Turn a negative snapshot value (invalid), a snapshot value of |
| 2339 | * 0 (unspecified), or a value bigger than the normal maximum |
| 2340 | * value, into the maximum allowed value. |
| 2341 | * |
| 2342 | * If some application really *needs* a bigger snapshot |
| 2343 | * length, we should just increase MAXIMUM_SNAPLEN. |
| 2344 | * |
| 2345 | * XXX - should we leave this up to the remote server to |
| 2346 | * do? |
| 2347 | */ |
| 2348 | if (snaplen <= 0 || snaplen > MAXIMUM_SNAPLEN) |
| 2349 | snaplen = MAXIMUM_SNAPLEN; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2350 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2351 | fp->opt.device = source_str; |
| 2352 | fp->snapshot = snaplen; |
| 2353 | fp->opt.timeout = read_timeout; |
| 2354 | pr = fp->priv; |
| 2355 | pr->rmt_flags = flags; |
| 2356 | |
| 2357 | /* |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2358 | * Attempt to set up the session with the server. |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2359 | */ |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2360 | if (rpcap_setup_session(fp->opt.device, auth, &active, &sockctrl, |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2361 | &pr->uses_ssl, &ssl, flags, &protocol_version, host, ctrlport, |
| 2362 | iface, errbuf) == -1) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2363 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2364 | /* Session setup failed. */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2365 | pcap_close(fp); |
| 2366 | return NULL; |
| 2367 | } |
| 2368 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2369 | /* All good so far, save the ssl handler */ |
| 2370 | ssl_main = ssl; |
| 2371 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2372 | /* |
| 2373 | * Now it's time to start playing with the RPCAP protocol |
| 2374 | * RPCAP open command: create the request message |
| 2375 | */ |
| 2376 | if (sock_bufferize(NULL, sizeof(struct rpcap_header), NULL, |
| 2377 | &sendbufidx, RPCAP_NETBUF_SIZE, SOCKBUF_CHECKONLY, errbuf, PCAP_ERRBUF_SIZE)) |
| 2378 | goto error_nodiscard; |
| 2379 | |
| 2380 | rpcap_createhdr((struct rpcap_header *) sendbuf, protocol_version, |
| 2381 | RPCAP_MSG_OPEN_REQ, 0, (uint32) strlen(iface)); |
| 2382 | |
| 2383 | if (sock_bufferize(iface, (int) strlen(iface), sendbuf, &sendbufidx, |
| 2384 | RPCAP_NETBUF_SIZE, SOCKBUF_BUFFERIZE, errbuf, PCAP_ERRBUF_SIZE)) |
| 2385 | goto error_nodiscard; |
| 2386 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2387 | if (sock_send(sockctrl, ssl, sendbuf, sendbufidx, errbuf, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2388 | PCAP_ERRBUF_SIZE) < 0) |
| 2389 | goto error_nodiscard; |
| 2390 | |
| 2391 | /* Receive and process the reply message header. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2392 | if (rpcap_process_msg_header(sockctrl, ssl, protocol_version, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2393 | RPCAP_MSG_OPEN_REQ, &header, errbuf) == -1) |
| 2394 | goto error_nodiscard; |
| 2395 | plen = header.plen; |
| 2396 | |
| 2397 | /* Read the reply body */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2398 | if (rpcap_recv(sockctrl, ssl, (char *)&openreply, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2399 | sizeof(struct rpcap_openreply), &plen, errbuf) == -1) |
| 2400 | goto error; |
| 2401 | |
| 2402 | /* Discard the rest of the message, if there is any. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2403 | if (rpcap_discard(sockctrl, ssl, plen, errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2404 | goto error_nodiscard; |
| 2405 | |
| 2406 | /* Set proper fields into the pcap_t struct */ |
| 2407 | fp->linktype = ntohl(openreply.linktype); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2408 | pr->rmt_sockctrl = sockctrl; |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2409 | pr->ctrl_ssl = ssl; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2410 | pr->protocol_version = protocol_version; |
| 2411 | pr->rmt_clientside = 1; |
| 2412 | |
| 2413 | /* This code is duplicated from the end of this function */ |
| 2414 | fp->read_op = pcap_read_rpcap; |
| 2415 | fp->save_current_filter_op = pcap_save_current_filter_rpcap; |
| 2416 | fp->setfilter_op = pcap_setfilter_rpcap; |
| 2417 | fp->getnonblock_op = pcap_getnonblock_rpcap; |
| 2418 | fp->setnonblock_op = pcap_setnonblock_rpcap; |
| 2419 | fp->stats_op = pcap_stats_rpcap; |
| 2420 | #ifdef _WIN32 |
| 2421 | fp->stats_ex_op = pcap_stats_ex_rpcap; |
| 2422 | #endif |
| 2423 | fp->cleanup_op = pcap_cleanup_rpcap; |
| 2424 | |
| 2425 | fp->activated = 1; |
| 2426 | return fp; |
| 2427 | |
| 2428 | error: |
| 2429 | /* |
| 2430 | * When the connection has been established, we have to close it. So, at the |
| 2431 | * beginning of this function, if an error occur we return immediately with |
| 2432 | * a return NULL; when the connection is established, we have to come here |
| 2433 | * ('goto error;') in order to close everything properly. |
| 2434 | */ |
| 2435 | |
| 2436 | /* |
| 2437 | * Discard the rest of the message. |
| 2438 | * We already reported an error; if this gets an error, just |
| 2439 | * drive on. |
| 2440 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2441 | (void)rpcap_discard(sockctrl, pr->ctrl_ssl, plen, NULL); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2442 | |
| 2443 | error_nodiscard: |
| 2444 | if (!active) |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2445 | { |
| 2446 | #ifdef HAVE_OPENSSL |
| 2447 | if (ssl) |
| 2448 | { |
| 2449 | // Finish using the SSL handle for the socket. |
| 2450 | // This must be done *before* the socket is closed. |
| 2451 | ssl_finish(ssl); |
| 2452 | } |
| 2453 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2454 | sock_close(sockctrl, NULL, 0); |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2455 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2456 | |
| 2457 | pcap_close(fp); |
| 2458 | return NULL; |
| 2459 | } |
| 2460 | |
| 2461 | /* String identifier to be used in the pcap_findalldevs_ex() */ |
| 2462 | #define PCAP_TEXT_SOURCE_ADAPTER "Network adapter" |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2463 | #define PCAP_TEXT_SOURCE_ADAPTER_LEN (sizeof PCAP_TEXT_SOURCE_ADAPTER - 1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2464 | /* String identifier to be used in the pcap_findalldevs_ex() */ |
| 2465 | #define PCAP_TEXT_SOURCE_ON_REMOTE_HOST "on remote node" |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2466 | #define PCAP_TEXT_SOURCE_ON_REMOTE_HOST_LEN (sizeof PCAP_TEXT_SOURCE_ON_REMOTE_HOST - 1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2467 | |
| 2468 | static void |
| 2469 | freeaddr(struct pcap_addr *addr) |
| 2470 | { |
| 2471 | free(addr->addr); |
| 2472 | free(addr->netmask); |
| 2473 | free(addr->broadaddr); |
| 2474 | free(addr->dstaddr); |
| 2475 | free(addr); |
| 2476 | } |
| 2477 | |
| 2478 | int |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2479 | pcap_findalldevs_ex_remote(const char *source, struct pcap_rmtauth *auth, pcap_if_t **alldevs, char *errbuf) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2480 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2481 | uint8 protocol_version; /* protocol version */ |
| 2482 | SOCKET sockctrl; /* socket descriptor of the control connection */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2483 | SSL *ssl = NULL; /* optional SSL handler for sockctrl */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2484 | uint32 plen; |
| 2485 | struct rpcap_header header; /* structure that keeps the general header of the rpcap protocol */ |
| 2486 | int i, j; /* temp variables */ |
| 2487 | int nif; /* Number of interfaces listed */ |
| 2488 | int active; /* 'true' if we the other end-party is in active mode */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2489 | uint8 uses_ssl; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2490 | char host[PCAP_BUF_SIZE], port[PCAP_BUF_SIZE]; |
| 2491 | char tmpstring[PCAP_BUF_SIZE + 1]; /* Needed to convert names and descriptions from 'old' syntax to the 'new' one */ |
| 2492 | pcap_if_t *lastdev; /* Last device in the pcap_if_t list */ |
| 2493 | pcap_if_t *dev; /* Device we're adding to the pcap_if_t list */ |
| 2494 | |
| 2495 | /* List starts out empty. */ |
| 2496 | (*alldevs) = NULL; |
| 2497 | lastdev = NULL; |
| 2498 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2499 | /* |
| 2500 | * Attempt to set up the session with the server. |
| 2501 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2502 | if (rpcap_setup_session(source, auth, &active, &sockctrl, &uses_ssl, |
| 2503 | &ssl, 0, &protocol_version, host, port, NULL, errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2504 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2505 | /* Session setup failed. */ |
| 2506 | return -1; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2507 | } |
| 2508 | |
| 2509 | /* RPCAP findalldevs command */ |
| 2510 | rpcap_createhdr(&header, protocol_version, RPCAP_MSG_FINDALLIF_REQ, |
| 2511 | 0, 0); |
| 2512 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2513 | if (sock_send(sockctrl, ssl, (char *)&header, sizeof(struct rpcap_header), |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2514 | errbuf, PCAP_ERRBUF_SIZE) < 0) |
| 2515 | goto error_nodiscard; |
| 2516 | |
| 2517 | /* Receive and process the reply message header. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2518 | if (rpcap_process_msg_header(sockctrl, ssl, protocol_version, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2519 | RPCAP_MSG_FINDALLIF_REQ, &header, errbuf) == -1) |
| 2520 | goto error_nodiscard; |
| 2521 | |
| 2522 | plen = header.plen; |
| 2523 | |
| 2524 | /* read the number of interfaces */ |
| 2525 | nif = ntohs(header.value); |
| 2526 | |
| 2527 | /* loop until all interfaces have been received */ |
| 2528 | for (i = 0; i < nif; i++) |
| 2529 | { |
| 2530 | struct rpcap_findalldevs_if findalldevs_if; |
| 2531 | char tmpstring2[PCAP_BUF_SIZE + 1]; /* Needed to convert names and descriptions from 'old' syntax to the 'new' one */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2532 | struct pcap_addr *addr, *prevaddr; |
| 2533 | |
| 2534 | tmpstring2[PCAP_BUF_SIZE] = 0; |
| 2535 | |
| 2536 | /* receive the findalldevs structure from remote host */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2537 | if (rpcap_recv(sockctrl, ssl, (char *)&findalldevs_if, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2538 | sizeof(struct rpcap_findalldevs_if), &plen, errbuf) == -1) |
| 2539 | goto error; |
| 2540 | |
| 2541 | findalldevs_if.namelen = ntohs(findalldevs_if.namelen); |
| 2542 | findalldevs_if.desclen = ntohs(findalldevs_if.desclen); |
| 2543 | findalldevs_if.naddr = ntohs(findalldevs_if.naddr); |
| 2544 | |
| 2545 | /* allocate the main structure */ |
| 2546 | dev = (pcap_if_t *)malloc(sizeof(pcap_if_t)); |
| 2547 | if (dev == NULL) |
| 2548 | { |
| 2549 | pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, |
| 2550 | errno, "malloc() failed"); |
| 2551 | goto error; |
| 2552 | } |
| 2553 | |
| 2554 | /* Initialize the structure to 'zero' */ |
| 2555 | memset(dev, 0, sizeof(pcap_if_t)); |
| 2556 | |
| 2557 | /* Append it to the list. */ |
| 2558 | if (lastdev == NULL) |
| 2559 | { |
| 2560 | /* |
| 2561 | * List is empty, so it's also the first device. |
| 2562 | */ |
| 2563 | *alldevs = dev; |
| 2564 | } |
| 2565 | else |
| 2566 | { |
| 2567 | /* |
| 2568 | * Append after the last device. |
| 2569 | */ |
| 2570 | lastdev->next = dev; |
| 2571 | } |
| 2572 | /* It's now the last device. */ |
| 2573 | lastdev = dev; |
| 2574 | |
| 2575 | /* allocate mem for name and description */ |
| 2576 | if (findalldevs_if.namelen) |
| 2577 | { |
| 2578 | |
| 2579 | if (findalldevs_if.namelen >= sizeof(tmpstring)) |
| 2580 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2581 | snprintf(errbuf, PCAP_ERRBUF_SIZE, "Interface name too long"); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2582 | goto error; |
| 2583 | } |
| 2584 | |
| 2585 | /* Retrieve adapter name */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2586 | if (rpcap_recv(sockctrl, ssl, tmpstring, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2587 | findalldevs_if.namelen, &plen, errbuf) == -1) |
| 2588 | goto error; |
| 2589 | |
| 2590 | tmpstring[findalldevs_if.namelen] = 0; |
| 2591 | |
| 2592 | /* Create the new device identifier */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2593 | if (pcap_createsrcstr_ex(tmpstring2, PCAP_SRC_IFREMOTE, |
| 2594 | host, port, tmpstring, uses_ssl, errbuf) == -1) |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2595 | goto error; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2596 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2597 | dev->name = strdup(tmpstring2); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2598 | if (dev->name == NULL) |
| 2599 | { |
| 2600 | pcap_fmt_errmsg_for_errno(errbuf, |
| 2601 | PCAP_ERRBUF_SIZE, errno, "malloc() failed"); |
| 2602 | goto error; |
| 2603 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2604 | } |
| 2605 | |
| 2606 | if (findalldevs_if.desclen) |
| 2607 | { |
| 2608 | if (findalldevs_if.desclen >= sizeof(tmpstring)) |
| 2609 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2610 | snprintf(errbuf, PCAP_ERRBUF_SIZE, "Interface description too long"); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2611 | goto error; |
| 2612 | } |
| 2613 | |
| 2614 | /* Retrieve adapter description */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2615 | if (rpcap_recv(sockctrl, ssl, tmpstring, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2616 | findalldevs_if.desclen, &plen, errbuf) == -1) |
| 2617 | goto error; |
| 2618 | |
| 2619 | tmpstring[findalldevs_if.desclen] = 0; |
| 2620 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2621 | if (pcap_asprintf(&dev->description, |
| 2622 | "%s '%s' %s %s", PCAP_TEXT_SOURCE_ADAPTER, |
| 2623 | tmpstring, PCAP_TEXT_SOURCE_ON_REMOTE_HOST, host) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2624 | { |
| 2625 | pcap_fmt_errmsg_for_errno(errbuf, |
| 2626 | PCAP_ERRBUF_SIZE, errno, "malloc() failed"); |
| 2627 | goto error; |
| 2628 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2629 | } |
| 2630 | |
| 2631 | dev->flags = ntohl(findalldevs_if.flags); |
| 2632 | |
| 2633 | prevaddr = NULL; |
| 2634 | /* loop until all addresses have been received */ |
| 2635 | for (j = 0; j < findalldevs_if.naddr; j++) |
| 2636 | { |
| 2637 | struct rpcap_findalldevs_ifaddr ifaddr; |
| 2638 | |
| 2639 | /* Retrieve the interface addresses */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2640 | if (rpcap_recv(sockctrl, ssl, (char *)&ifaddr, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2641 | sizeof(struct rpcap_findalldevs_ifaddr), |
| 2642 | &plen, errbuf) == -1) |
| 2643 | goto error; |
| 2644 | |
| 2645 | /* |
| 2646 | * Deserialize all the address components. |
| 2647 | */ |
| 2648 | addr = (struct pcap_addr *) malloc(sizeof(struct pcap_addr)); |
| 2649 | if (addr == NULL) |
| 2650 | { |
| 2651 | pcap_fmt_errmsg_for_errno(errbuf, |
| 2652 | PCAP_ERRBUF_SIZE, errno, "malloc() failed"); |
| 2653 | goto error; |
| 2654 | } |
| 2655 | addr->next = NULL; |
| 2656 | addr->addr = NULL; |
| 2657 | addr->netmask = NULL; |
| 2658 | addr->broadaddr = NULL; |
| 2659 | addr->dstaddr = NULL; |
| 2660 | |
| 2661 | if (rpcap_deseraddr(&ifaddr.addr, |
| 2662 | (struct sockaddr_storage **) &addr->addr, errbuf) == -1) |
| 2663 | { |
| 2664 | freeaddr(addr); |
| 2665 | goto error; |
| 2666 | } |
| 2667 | if (rpcap_deseraddr(&ifaddr.netmask, |
| 2668 | (struct sockaddr_storage **) &addr->netmask, errbuf) == -1) |
| 2669 | { |
| 2670 | freeaddr(addr); |
| 2671 | goto error; |
| 2672 | } |
| 2673 | if (rpcap_deseraddr(&ifaddr.broadaddr, |
| 2674 | (struct sockaddr_storage **) &addr->broadaddr, errbuf) == -1) |
| 2675 | { |
| 2676 | freeaddr(addr); |
| 2677 | goto error; |
| 2678 | } |
| 2679 | if (rpcap_deseraddr(&ifaddr.dstaddr, |
| 2680 | (struct sockaddr_storage **) &addr->dstaddr, errbuf) == -1) |
| 2681 | { |
| 2682 | freeaddr(addr); |
| 2683 | goto error; |
| 2684 | } |
| 2685 | |
| 2686 | if ((addr->addr == NULL) && (addr->netmask == NULL) && |
| 2687 | (addr->broadaddr == NULL) && (addr->dstaddr == NULL)) |
| 2688 | { |
| 2689 | /* |
| 2690 | * None of the addresses are IPv4 or IPv6 |
| 2691 | * addresses, so throw this entry away. |
| 2692 | */ |
| 2693 | free(addr); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2694 | } |
| 2695 | else |
| 2696 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2697 | /* |
| 2698 | * Add this entry to the list. |
| 2699 | */ |
| 2700 | if (prevaddr == NULL) |
| 2701 | { |
| 2702 | dev->addresses = addr; |
| 2703 | } |
| 2704 | else |
| 2705 | { |
| 2706 | prevaddr->next = addr; |
| 2707 | } |
| 2708 | prevaddr = addr; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2709 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2710 | } |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2711 | } |
| 2712 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2713 | /* Discard the rest of the message. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2714 | if (rpcap_discard(sockctrl, ssl, plen, errbuf) == 1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2715 | goto error_nodiscard; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2716 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2717 | /* Control connection has to be closed only in case the remote machine is in passive mode */ |
| 2718 | if (!active) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2719 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2720 | /* DO not send RPCAP_CLOSE, since we did not open a pcap_t; no need to free resources */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2721 | #ifdef HAVE_OPENSSL |
| 2722 | if (ssl) |
| 2723 | { |
| 2724 | // Finish using the SSL handle for the socket. |
| 2725 | // This must be done *before* the socket is closed. |
| 2726 | ssl_finish(ssl); |
| 2727 | } |
| 2728 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2729 | if (sock_close(sockctrl, errbuf, PCAP_ERRBUF_SIZE)) |
| 2730 | return -1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2731 | } |
| 2732 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2733 | /* To avoid inconsistencies in the number of sock_init() */ |
| 2734 | sock_cleanup(); |
| 2735 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2736 | return 0; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2737 | |
| 2738 | error: |
| 2739 | /* |
| 2740 | * In case there has been an error, I don't want to overwrite it with a new one |
| 2741 | * if the following call fails. I want to return always the original error. |
| 2742 | * |
| 2743 | * Take care: this connection can already be closed when we try to close it. |
| 2744 | * This happens because a previous error in the rpcapd, which requested to |
| 2745 | * closed the connection. In that case, we already recognized that into the |
| 2746 | * rpspck_isheaderok() and we already acknowledged the closing. |
| 2747 | * In that sense, this call is useless here (however it is needed in case |
| 2748 | * the client generates the error). |
| 2749 | * |
| 2750 | * Checks if all the data has been read; if not, discard the data in excess |
| 2751 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2752 | (void) rpcap_discard(sockctrl, ssl, plen, NULL); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2753 | |
| 2754 | error_nodiscard: |
| 2755 | /* Control connection has to be closed only in case the remote machine is in passive mode */ |
| 2756 | if (!active) |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2757 | { |
| 2758 | #ifdef HAVE_OPENSSL |
| 2759 | if (ssl) |
| 2760 | { |
| 2761 | // Finish using the SSL handle for the socket. |
| 2762 | // This must be done *before* the socket is closed. |
| 2763 | ssl_finish(ssl); |
| 2764 | } |
| 2765 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2766 | sock_close(sockctrl, NULL, 0); |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2767 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2768 | |
| 2769 | /* To avoid inconsistencies in the number of sock_init() */ |
| 2770 | sock_cleanup(); |
| 2771 | |
| 2772 | /* Free whatever interfaces we've allocated. */ |
| 2773 | pcap_freealldevs(*alldevs); |
| 2774 | |
| 2775 | return -1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2776 | } |
| 2777 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2778 | /* |
| 2779 | * Active mode routines. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2780 | * |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2781 | * The old libpcap API is somewhat ugly, and makes active mode difficult |
| 2782 | * to implement; we provide some APIs for it that work only with rpcap. |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2783 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2784 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2785 | SOCKET pcap_remoteact_accept_ex(const char *address, const char *port, const char *hostlist, char *connectinghost, struct pcap_rmtauth *auth, int uses_ssl, char *errbuf) |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2786 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2787 | /* socket-related variables */ |
| 2788 | struct addrinfo hints; /* temporary struct to keep settings needed to open the new socket */ |
| 2789 | struct addrinfo *addrinfo; /* keeps the addrinfo chain; required to open a new socket */ |
| 2790 | struct sockaddr_storage from; /* generic sockaddr_storage variable */ |
| 2791 | socklen_t fromlen; /* keeps the length of the sockaddr_storage variable */ |
| 2792 | SOCKET sockctrl; /* keeps the main socket identifier */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2793 | SSL *ssl = NULL; /* Optional SSL handler for sockctrl */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2794 | uint8 protocol_version; /* negotiated protocol version */ |
| 2795 | struct activehosts *temp, *prev; /* temp var needed to scan he host list chain */ |
| 2796 | |
| 2797 | *connectinghost = 0; /* just in case */ |
| 2798 | |
| 2799 | /* Prepare to open a new server socket */ |
| 2800 | memset(&hints, 0, sizeof(struct addrinfo)); |
| 2801 | /* WARNING Currently it supports only ONE socket family among ipv4 and IPv6 */ |
| 2802 | hints.ai_family = AF_INET; /* PF_UNSPEC to have both IPv4 and IPv6 server */ |
| 2803 | hints.ai_flags = AI_PASSIVE; /* Ready to a bind() socket */ |
| 2804 | hints.ai_socktype = SOCK_STREAM; |
| 2805 | |
| 2806 | /* Warning: this call can be the first one called by the user. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2807 | /* For this reason, we have to initialize the Winsock support. */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2808 | if (sock_init(errbuf, PCAP_ERRBUF_SIZE) == -1) |
| 2809 | return (SOCKET)-1; |
| 2810 | |
| 2811 | /* Do the work */ |
| 2812 | if ((port == NULL) || (port[0] == 0)) |
| 2813 | { |
| 2814 | if (sock_initaddress(address, RPCAP_DEFAULT_NETPORT_ACTIVE, &hints, &addrinfo, errbuf, PCAP_ERRBUF_SIZE) == -1) |
| 2815 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2816 | return (SOCKET)-2; |
| 2817 | } |
| 2818 | } |
| 2819 | else |
| 2820 | { |
| 2821 | if (sock_initaddress(address, port, &hints, &addrinfo, errbuf, PCAP_ERRBUF_SIZE) == -1) |
| 2822 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2823 | return (SOCKET)-2; |
| 2824 | } |
| 2825 | } |
| 2826 | |
| 2827 | |
| 2828 | if ((sockmain = sock_open(addrinfo, SOCKOPEN_SERVER, 1, errbuf, PCAP_ERRBUF_SIZE)) == INVALID_SOCKET) |
| 2829 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2830 | freeaddrinfo(addrinfo); |
| 2831 | return (SOCKET)-2; |
| 2832 | } |
| 2833 | freeaddrinfo(addrinfo); |
| 2834 | |
| 2835 | /* Connection creation */ |
| 2836 | fromlen = sizeof(struct sockaddr_storage); |
| 2837 | |
| 2838 | sockctrl = accept(sockmain, (struct sockaddr *) &from, &fromlen); |
| 2839 | |
| 2840 | /* We're not using sock_close, since we do not want to send a shutdown */ |
| 2841 | /* (which is not allowed on a non-connected socket) */ |
| 2842 | closesocket(sockmain); |
| 2843 | sockmain = 0; |
| 2844 | |
| 2845 | if (sockctrl == INVALID_SOCKET) |
| 2846 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2847 | sock_geterror("accept()", errbuf, PCAP_ERRBUF_SIZE); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2848 | return (SOCKET)-2; |
| 2849 | } |
| 2850 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2851 | /* Promote to SSL early before any error message may be sent */ |
| 2852 | if (uses_ssl) |
| 2853 | { |
| 2854 | #ifdef HAVE_OPENSSL |
| 2855 | ssl = ssl_promotion(0, sockctrl, errbuf, PCAP_ERRBUF_SIZE); |
| 2856 | if (! ssl) |
| 2857 | { |
| 2858 | sock_close(sockctrl, NULL, 0); |
| 2859 | return (SOCKET)-1; |
| 2860 | } |
| 2861 | #else |
| 2862 | snprintf(errbuf, PCAP_ERRBUF_SIZE, "No TLS support"); |
| 2863 | sock_close(sockctrl, NULL, 0); |
| 2864 | return (SOCKET)-1; |
| 2865 | #endif |
| 2866 | } |
| 2867 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2868 | /* Get the numeric for of the name of the connecting host */ |
| 2869 | if (getnameinfo((struct sockaddr *) &from, fromlen, connectinghost, RPCAP_HOSTLIST_SIZE, NULL, 0, NI_NUMERICHOST)) |
| 2870 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 2871 | sock_geterror("getnameinfo()", errbuf, PCAP_ERRBUF_SIZE); |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2872 | rpcap_senderror(sockctrl, ssl, 0, PCAP_ERR_REMOTEACCEPT, errbuf, NULL); |
| 2873 | #ifdef HAVE_OPENSSL |
| 2874 | if (ssl) |
| 2875 | { |
| 2876 | // Finish using the SSL handle for the socket. |
| 2877 | // This must be done *before* the socket is closed. |
| 2878 | ssl_finish(ssl); |
| 2879 | } |
| 2880 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2881 | sock_close(sockctrl, NULL, 0); |
| 2882 | return (SOCKET)-1; |
| 2883 | } |
| 2884 | |
| 2885 | /* checks if the connecting host is among the ones allowed */ |
| 2886 | if (sock_check_hostlist((char *)hostlist, RPCAP_HOSTLIST_SEP, &from, errbuf, PCAP_ERRBUF_SIZE) < 0) |
| 2887 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2888 | rpcap_senderror(sockctrl, ssl, 0, PCAP_ERR_REMOTEACCEPT, errbuf, NULL); |
| 2889 | #ifdef HAVE_OPENSSL |
| 2890 | if (ssl) |
| 2891 | { |
| 2892 | // Finish using the SSL handle for the socket. |
| 2893 | // This must be done *before* the socket is closed. |
| 2894 | ssl_finish(ssl); |
| 2895 | } |
| 2896 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2897 | sock_close(sockctrl, NULL, 0); |
| 2898 | return (SOCKET)-1; |
| 2899 | } |
| 2900 | |
| 2901 | /* |
| 2902 | * Send authentication to the remote machine. |
| 2903 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2904 | if (rpcap_doauth(sockctrl, ssl, &protocol_version, auth, errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2905 | { |
| 2906 | /* Unrecoverable error. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2907 | rpcap_senderror(sockctrl, ssl, 0, PCAP_ERR_REMOTEACCEPT, errbuf, NULL); |
| 2908 | #ifdef HAVE_OPENSSL |
| 2909 | if (ssl) |
| 2910 | { |
| 2911 | // Finish using the SSL handle for the socket. |
| 2912 | // This must be done *before* the socket is closed. |
| 2913 | ssl_finish(ssl); |
| 2914 | } |
| 2915 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2916 | sock_close(sockctrl, NULL, 0); |
| 2917 | return (SOCKET)-3; |
| 2918 | } |
| 2919 | |
| 2920 | /* Checks that this host does not already have a cntrl connection in place */ |
| 2921 | |
| 2922 | /* Initialize pointers */ |
| 2923 | temp = activeHosts; |
| 2924 | prev = NULL; |
| 2925 | |
| 2926 | while (temp) |
| 2927 | { |
| 2928 | /* This host already has an active connection in place, so I don't have to update the host list */ |
| 2929 | if (sock_cmpaddr(&temp->host, &from) == 0) |
| 2930 | return sockctrl; |
| 2931 | |
| 2932 | prev = temp; |
| 2933 | temp = temp->next; |
| 2934 | } |
| 2935 | |
| 2936 | /* The host does not exist in the list; so I have to update the list */ |
| 2937 | if (prev) |
| 2938 | { |
| 2939 | prev->next = (struct activehosts *) malloc(sizeof(struct activehosts)); |
| 2940 | temp = prev->next; |
| 2941 | } |
| 2942 | else |
| 2943 | { |
| 2944 | activeHosts = (struct activehosts *) malloc(sizeof(struct activehosts)); |
| 2945 | temp = activeHosts; |
| 2946 | } |
| 2947 | |
| 2948 | if (temp == NULL) |
| 2949 | { |
| 2950 | pcap_fmt_errmsg_for_errno(errbuf, PCAP_ERRBUF_SIZE, |
| 2951 | errno, "malloc() failed"); |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2952 | rpcap_senderror(sockctrl, ssl, protocol_version, PCAP_ERR_REMOTEACCEPT, errbuf, NULL); |
| 2953 | #ifdef HAVE_OPENSSL |
| 2954 | if (ssl) |
| 2955 | { |
| 2956 | // Finish using the SSL handle for the socket. |
| 2957 | // This must be done *before* the socket is closed. |
| 2958 | ssl_finish(ssl); |
| 2959 | } |
| 2960 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2961 | sock_close(sockctrl, NULL, 0); |
| 2962 | return (SOCKET)-1; |
| 2963 | } |
| 2964 | |
| 2965 | memcpy(&temp->host, &from, fromlen); |
| 2966 | temp->sockctrl = sockctrl; |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2967 | temp->ssl = ssl; |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2968 | temp->protocol_version = protocol_version; |
| 2969 | temp->next = NULL; |
| 2970 | |
| 2971 | return sockctrl; |
| 2972 | } |
| 2973 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 2974 | SOCKET pcap_remoteact_accept(const char *address, const char *port, const char *hostlist, char *connectinghost, struct pcap_rmtauth *auth, char *errbuf) |
| 2975 | { |
| 2976 | return pcap_remoteact_accept_ex(address, port, hostlist, connectinghost, auth, 0, errbuf); |
| 2977 | } |
| 2978 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2979 | int pcap_remoteact_close(const char *host, char *errbuf) |
| 2980 | { |
| 2981 | struct activehosts *temp, *prev; /* temp var needed to scan the host list chain */ |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2982 | struct addrinfo hints, *addrinfo, *ai_next; /* temp var needed to translate between hostname to its address */ |
| 2983 | int retval; |
| 2984 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2985 | temp = activeHosts; |
| 2986 | prev = NULL; |
| 2987 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2988 | /* retrieve the network address corresponding to 'host' */ |
| 2989 | addrinfo = NULL; |
| 2990 | memset(&hints, 0, sizeof(struct addrinfo)); |
| 2991 | hints.ai_family = PF_UNSPEC; |
| 2992 | hints.ai_socktype = SOCK_STREAM; |
| 2993 | |
Elliott Hughes | 773b27c | 2021-08-20 17:37:36 -0700 | [diff] [blame] | 2994 | retval = sock_initaddress(host, "0", &hints, &addrinfo, errbuf, |
| 2995 | PCAP_ERRBUF_SIZE); |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2996 | if (retval != 0) |
| 2997 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 2998 | return -1; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 2999 | } |
| 3000 | |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 3001 | while (temp) |
| 3002 | { |
| 3003 | ai_next = addrinfo; |
| 3004 | while (ai_next) |
| 3005 | { |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3006 | if (sock_cmpaddr(&temp->host, (struct sockaddr_storage *) ai_next->ai_addr) == 0) |
| 3007 | { |
| 3008 | struct rpcap_header header; |
| 3009 | int status = 0; |
| 3010 | |
| 3011 | /* Close this connection */ |
| 3012 | rpcap_createhdr(&header, temp->protocol_version, |
| 3013 | RPCAP_MSG_CLOSE, 0, 0); |
| 3014 | |
| 3015 | /* |
| 3016 | * Don't check for errors, since we're |
| 3017 | * just cleaning up. |
| 3018 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3019 | if (sock_send(temp->sockctrl, temp->ssl, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3020 | (char *)&header, |
| 3021 | sizeof(struct rpcap_header), errbuf, |
| 3022 | PCAP_ERRBUF_SIZE) < 0) |
| 3023 | { |
| 3024 | /* |
| 3025 | * Let that error be the one we |
| 3026 | * report. |
| 3027 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3028 | #ifdef HAVE_OPENSSL |
| 3029 | if (temp->ssl) |
| 3030 | { |
| 3031 | // Finish using the SSL handle |
| 3032 | // for the socket. |
| 3033 | // This must be done *before* |
| 3034 | // the socket is closed. |
| 3035 | ssl_finish(temp->ssl); |
| 3036 | } |
| 3037 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3038 | (void)sock_close(temp->sockctrl, NULL, |
| 3039 | 0); |
| 3040 | status = -1; |
| 3041 | } |
| 3042 | else |
| 3043 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3044 | #ifdef HAVE_OPENSSL |
| 3045 | if (temp->ssl) |
| 3046 | { |
| 3047 | // Finish using the SSL handle |
| 3048 | // for the socket. |
| 3049 | // This must be done *before* |
| 3050 | // the socket is closed. |
| 3051 | ssl_finish(temp->ssl); |
| 3052 | } |
| 3053 | #endif |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3054 | if (sock_close(temp->sockctrl, errbuf, |
| 3055 | PCAP_ERRBUF_SIZE) == -1) |
| 3056 | status = -1; |
| 3057 | } |
| 3058 | |
| 3059 | /* |
| 3060 | * Remove the host from the list of active |
| 3061 | * hosts. |
| 3062 | */ |
| 3063 | if (prev) |
| 3064 | prev->next = temp->next; |
| 3065 | else |
| 3066 | activeHosts = temp->next; |
| 3067 | |
| 3068 | freeaddrinfo(addrinfo); |
| 3069 | |
| 3070 | free(temp); |
| 3071 | |
| 3072 | /* To avoid inconsistencies in the number of sock_init() */ |
| 3073 | sock_cleanup(); |
| 3074 | |
| 3075 | return status; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 3076 | } |
| 3077 | |
| 3078 | ai_next = ai_next->ai_next; |
| 3079 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3080 | prev = temp; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 3081 | temp = temp->next; |
| 3082 | } |
| 3083 | |
| 3084 | if (addrinfo) |
| 3085 | freeaddrinfo(addrinfo); |
| 3086 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3087 | /* To avoid inconsistencies in the number of sock_init() */ |
| 3088 | sock_cleanup(); |
| 3089 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3090 | snprintf(errbuf, PCAP_ERRBUF_SIZE, "The host you want to close the active connection is not known"); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3091 | return -1; |
| 3092 | } |
| 3093 | |
| 3094 | void pcap_remoteact_cleanup(void) |
| 3095 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3096 | # ifdef HAVE_OPENSSL |
| 3097 | if (ssl_main) |
| 3098 | { |
| 3099 | // Finish using the SSL handle for the main active socket. |
| 3100 | // This must be done *before* the socket is closed. |
| 3101 | ssl_finish(ssl_main); |
| 3102 | ssl_main = NULL; |
| 3103 | } |
| 3104 | # endif |
| 3105 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3106 | /* Very dirty, but it works */ |
| 3107 | if (sockmain) |
| 3108 | { |
| 3109 | closesocket(sockmain); |
| 3110 | |
| 3111 | /* To avoid inconsistencies in the number of sock_init() */ |
| 3112 | sock_cleanup(); |
| 3113 | } |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3114 | } |
| 3115 | |
| 3116 | int pcap_remoteact_list(char *hostlist, char sep, int size, char *errbuf) |
| 3117 | { |
| 3118 | struct activehosts *temp; /* temp var needed to scan the host list chain */ |
| 3119 | size_t len; |
| 3120 | char hoststr[RPCAP_HOSTLIST_SIZE + 1]; |
| 3121 | |
| 3122 | temp = activeHosts; |
| 3123 | |
| 3124 | len = 0; |
| 3125 | *hostlist = 0; |
| 3126 | |
| 3127 | while (temp) |
| 3128 | { |
| 3129 | /*int sock_getascii_addrport(const struct sockaddr_storage *sockaddr, char *address, int addrlen, char *port, int portlen, int flags, char *errbuf, int errbuflen) */ |
| 3130 | |
| 3131 | /* Get the numeric form of the name of the connecting host */ |
| 3132 | if (sock_getascii_addrport((struct sockaddr_storage *) &temp->host, hoststr, |
| 3133 | RPCAP_HOSTLIST_SIZE, NULL, 0, NI_NUMERICHOST, errbuf, PCAP_ERRBUF_SIZE) != -1) |
| 3134 | /* if (getnameinfo( (struct sockaddr *) &temp->host, sizeof (struct sockaddr_storage), hoststr, */ |
| 3135 | /* RPCAP_HOSTLIST_SIZE, NULL, 0, NI_NUMERICHOST) ) */ |
| 3136 | { |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 3137 | /* sock_geterror("getnameinfo()", errbuf, PCAP_ERRBUF_SIZE); */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3138 | return -1; |
| 3139 | } |
| 3140 | |
| 3141 | len = len + strlen(hoststr) + 1 /* the separator */; |
| 3142 | |
| 3143 | if ((size < 0) || (len >= (size_t)size)) |
| 3144 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3145 | snprintf(errbuf, PCAP_ERRBUF_SIZE, "The string you provided is not able to keep " |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3146 | "the hostnames for all the active connections"); |
| 3147 | return -1; |
| 3148 | } |
| 3149 | |
Haibo Huang | 4ccd683 | 2020-04-23 18:03:48 -0700 | [diff] [blame] | 3150 | pcap_strlcat(hostlist, hoststr, PCAP_ERRBUF_SIZE); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3151 | hostlist[len - 1] = sep; |
| 3152 | hostlist[len] = 0; |
| 3153 | |
| 3154 | temp = temp->next; |
| 3155 | } |
| 3156 | |
| 3157 | return 0; |
| 3158 | } |
| 3159 | |
| 3160 | /* |
| 3161 | * Receive the header of a message. |
| 3162 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3163 | static int rpcap_recv_msg_header(SOCKET sock, SSL *ssl, struct rpcap_header *header, char *errbuf) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3164 | { |
| 3165 | int nrecv; |
| 3166 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3167 | nrecv = sock_recv(sock, ssl, (char *) header, sizeof(struct rpcap_header), |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3168 | SOCK_RECEIVEALL_YES|SOCK_EOF_IS_ERROR, errbuf, |
| 3169 | PCAP_ERRBUF_SIZE); |
| 3170 | if (nrecv == -1) |
| 3171 | { |
| 3172 | /* Network error. */ |
| 3173 | return -1; |
| 3174 | } |
| 3175 | header->plen = ntohl(header->plen); |
| 3176 | return 0; |
| 3177 | } |
| 3178 | |
| 3179 | /* |
| 3180 | * Make sure the protocol version of a received message is what we were |
| 3181 | * expecting. |
| 3182 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3183 | static int rpcap_check_msg_ver(SOCKET sock, SSL *ssl, uint8 expected_ver, struct rpcap_header *header, char *errbuf) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3184 | { |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 3185 | /* |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3186 | * Did the server specify the version we negotiated? |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 3187 | */ |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3188 | if (header->ver != expected_ver) |
| 3189 | { |
| 3190 | /* |
| 3191 | * Discard the rest of the message. |
| 3192 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3193 | if (rpcap_discard(sock, ssl, header->plen, errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3194 | return -1; |
| 3195 | |
| 3196 | /* |
| 3197 | * Tell our caller that it's not the negotiated version. |
| 3198 | */ |
| 3199 | if (errbuf != NULL) |
| 3200 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3201 | snprintf(errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3202 | "Server sent us a message with version %u when we were expecting %u", |
| 3203 | header->ver, expected_ver); |
| 3204 | } |
| 3205 | return -1; |
| 3206 | } |
| 3207 | return 0; |
| 3208 | } |
| 3209 | |
| 3210 | /* |
| 3211 | * Check the message type of a received message, which should either be |
| 3212 | * the expected message type or RPCAP_MSG_ERROR. |
| 3213 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3214 | static int rpcap_check_msg_type(SOCKET sock, SSL *ssl, uint8 request_type, struct rpcap_header *header, uint16 *errcode, char *errbuf) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3215 | { |
| 3216 | const char *request_type_string; |
| 3217 | const char *msg_type_string; |
| 3218 | |
| 3219 | /* |
| 3220 | * What type of message is it? |
| 3221 | */ |
| 3222 | if (header->type == RPCAP_MSG_ERROR) |
| 3223 | { |
| 3224 | /* |
| 3225 | * The server reported an error. |
| 3226 | * Hand that error back to our caller. |
| 3227 | */ |
| 3228 | *errcode = ntohs(header->value); |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3229 | rpcap_msg_err(sock, ssl, header->plen, errbuf); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3230 | return -1; |
| 3231 | } |
| 3232 | |
| 3233 | *errcode = 0; |
| 3234 | |
| 3235 | /* |
| 3236 | * For a given request type value, the expected reply type value |
| 3237 | * is the request type value with ORed with RPCAP_MSG_IS_REPLY. |
| 3238 | */ |
| 3239 | if (header->type != (request_type | RPCAP_MSG_IS_REPLY)) |
| 3240 | { |
| 3241 | /* |
| 3242 | * This isn't a reply to the request we sent. |
| 3243 | */ |
| 3244 | |
| 3245 | /* |
| 3246 | * Discard the rest of the message. |
| 3247 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3248 | if (rpcap_discard(sock, ssl, header->plen, errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3249 | return -1; |
| 3250 | |
| 3251 | /* |
| 3252 | * Tell our caller about it. |
| 3253 | */ |
| 3254 | request_type_string = rpcap_msg_type_string(request_type); |
| 3255 | msg_type_string = rpcap_msg_type_string(header->type); |
| 3256 | if (errbuf != NULL) |
| 3257 | { |
| 3258 | if (request_type_string == NULL) |
| 3259 | { |
| 3260 | /* This should not happen. */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3261 | snprintf(errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3262 | "rpcap_check_msg_type called for request message with type %u", |
| 3263 | request_type); |
| 3264 | return -1; |
| 3265 | } |
| 3266 | if (msg_type_string != NULL) |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3267 | snprintf(errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3268 | "%s message received in response to a %s message", |
| 3269 | msg_type_string, request_type_string); |
| 3270 | else |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3271 | snprintf(errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3272 | "Message of unknown type %u message received in response to a %s request", |
| 3273 | header->type, request_type_string); |
| 3274 | } |
| 3275 | return -1; |
| 3276 | } |
| 3277 | |
| 3278 | return 0; |
| 3279 | } |
| 3280 | |
| 3281 | /* |
| 3282 | * Receive and process the header of a message. |
| 3283 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3284 | static int rpcap_process_msg_header(SOCKET sock, SSL *ssl, uint8 expected_ver, uint8 request_type, struct rpcap_header *header, char *errbuf) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3285 | { |
| 3286 | uint16 errcode; |
| 3287 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3288 | if (rpcap_recv_msg_header(sock, ssl, header, errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3289 | { |
| 3290 | /* Network error. */ |
| 3291 | return -1; |
| 3292 | } |
| 3293 | |
| 3294 | /* |
| 3295 | * Did the server specify the version we negotiated? |
| 3296 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3297 | if (rpcap_check_msg_ver(sock, ssl, expected_ver, header, errbuf) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3298 | return -1; |
| 3299 | |
| 3300 | /* |
| 3301 | * Check the message type. |
| 3302 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3303 | return rpcap_check_msg_type(sock, ssl, request_type, header, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3304 | &errcode, errbuf); |
| 3305 | } |
| 3306 | |
| 3307 | /* |
| 3308 | * Read data from a message. |
| 3309 | * If we're trying to read more data that remains, puts an error |
| 3310 | * message into errmsgbuf and returns -2. Otherwise, tries to read |
| 3311 | * the data and, if that succeeds, subtracts the amount read from |
| 3312 | * the number of bytes of data that remains. |
| 3313 | * Returns 0 on success, logs a message and returns -1 on a network |
| 3314 | * error. |
| 3315 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3316 | static int rpcap_recv(SOCKET sock, SSL *ssl, void *buffer, size_t toread, uint32 *plen, char *errbuf) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3317 | { |
| 3318 | int nread; |
| 3319 | |
| 3320 | if (toread > *plen) |
| 3321 | { |
| 3322 | /* The server sent us a bad message */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3323 | snprintf(errbuf, PCAP_ERRBUF_SIZE, "Message payload is too short"); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3324 | return -1; |
| 3325 | } |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3326 | nread = sock_recv(sock, ssl, buffer, toread, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3327 | SOCK_RECEIVEALL_YES|SOCK_EOF_IS_ERROR, errbuf, PCAP_ERRBUF_SIZE); |
| 3328 | if (nread == -1) |
| 3329 | { |
| 3330 | return -1; |
| 3331 | } |
| 3332 | *plen -= nread; |
| 3333 | return 0; |
| 3334 | } |
| 3335 | |
| 3336 | /* |
| 3337 | * This handles the RPCAP_MSG_ERROR message. |
| 3338 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3339 | static void rpcap_msg_err(SOCKET sockctrl, SSL *ssl, uint32 plen, char *remote_errbuf) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3340 | { |
| 3341 | char errbuf[PCAP_ERRBUF_SIZE]; |
| 3342 | |
| 3343 | if (plen >= PCAP_ERRBUF_SIZE) |
| 3344 | { |
| 3345 | /* |
| 3346 | * Message is too long; just read as much of it as we |
| 3347 | * can into the buffer provided, and discard the rest. |
| 3348 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3349 | if (sock_recv(sockctrl, ssl, remote_errbuf, PCAP_ERRBUF_SIZE - 1, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3350 | SOCK_RECEIVEALL_YES|SOCK_EOF_IS_ERROR, errbuf, |
| 3351 | PCAP_ERRBUF_SIZE) == -1) |
| 3352 | { |
| 3353 | // Network error. |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3354 | snprintf(remote_errbuf, PCAP_ERRBUF_SIZE, "Read of error message from client failed: %s", errbuf); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3355 | return; |
| 3356 | } |
| 3357 | |
| 3358 | /* |
| 3359 | * Null-terminate it. |
| 3360 | */ |
| 3361 | remote_errbuf[PCAP_ERRBUF_SIZE - 1] = '\0'; |
| 3362 | |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3363 | #ifdef _WIN32 |
| 3364 | /* |
| 3365 | * If we're not in UTF-8 mode, convert it to the local |
| 3366 | * code page. |
| 3367 | */ |
| 3368 | if (!pcap_utf_8_mode) |
| 3369 | utf_8_to_acp_truncated(remote_errbuf); |
| 3370 | #endif |
| 3371 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3372 | /* |
| 3373 | * Throw away the rest. |
| 3374 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3375 | (void)rpcap_discard(sockctrl, ssl, plen - (PCAP_ERRBUF_SIZE - 1), remote_errbuf); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3376 | } |
| 3377 | else if (plen == 0) |
| 3378 | { |
| 3379 | /* Empty error string. */ |
| 3380 | remote_errbuf[0] = '\0'; |
| 3381 | } |
| 3382 | else |
| 3383 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3384 | if (sock_recv(sockctrl, ssl, remote_errbuf, plen, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3385 | SOCK_RECEIVEALL_YES|SOCK_EOF_IS_ERROR, errbuf, |
| 3386 | PCAP_ERRBUF_SIZE) == -1) |
| 3387 | { |
| 3388 | // Network error. |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3389 | snprintf(remote_errbuf, PCAP_ERRBUF_SIZE, "Read of error message from client failed: %s", errbuf); |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3390 | return; |
| 3391 | } |
| 3392 | |
| 3393 | /* |
| 3394 | * Null-terminate it. |
| 3395 | */ |
| 3396 | remote_errbuf[plen] = '\0'; |
| 3397 | } |
| 3398 | } |
| 3399 | |
| 3400 | /* |
| 3401 | * Discard data from a connection. |
| 3402 | * Mostly used to discard wrong-sized messages. |
| 3403 | * Returns 0 on success, logs a message and returns -1 on a network |
| 3404 | * error. |
| 3405 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3406 | static int rpcap_discard(SOCKET sock, SSL *ssl, uint32 len, char *errbuf) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3407 | { |
| 3408 | if (len != 0) |
| 3409 | { |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3410 | if (sock_discard(sock, ssl, len, errbuf, PCAP_ERRBUF_SIZE) == -1) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3411 | { |
| 3412 | // Network error. |
| 3413 | return -1; |
| 3414 | } |
| 3415 | } |
| 3416 | return 0; |
| 3417 | } |
| 3418 | |
| 3419 | /* |
| 3420 | * Read bytes into the pcap_t's buffer until we have the specified |
| 3421 | * number of bytes read or we get an error or interrupt indication. |
| 3422 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3423 | static int rpcap_read_packet_msg(struct pcap_rpcap const *rp, pcap_t *p, size_t size) |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3424 | { |
| 3425 | u_char *bp; |
| 3426 | int cc; |
| 3427 | int bytes_read; |
| 3428 | |
| 3429 | bp = p->bp; |
| 3430 | cc = p->cc; |
| 3431 | |
| 3432 | /* |
| 3433 | * Loop until we have the amount of data requested or we get |
| 3434 | * an error or interrupt. |
| 3435 | */ |
| 3436 | while ((size_t)cc < size) |
| 3437 | { |
| 3438 | /* |
| 3439 | * We haven't read all of the packet header yet. |
| 3440 | * Read what remains, which could be all of it. |
| 3441 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3442 | bytes_read = sock_recv(rp->rmt_sockdata, rp->data_ssl, bp, size - cc, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3443 | SOCK_RECEIVEALL_NO|SOCK_EOF_IS_ERROR, p->errbuf, |
| 3444 | PCAP_ERRBUF_SIZE); |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3445 | |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3446 | if (bytes_read == -1) |
| 3447 | { |
| 3448 | /* |
| 3449 | * Network error. Update the read pointer and |
| 3450 | * byte count, and return an error indication. |
| 3451 | */ |
| 3452 | p->bp = bp; |
| 3453 | p->cc = cc; |
| 3454 | return -1; |
| 3455 | } |
| 3456 | if (bytes_read == -3) |
| 3457 | { |
| 3458 | /* |
| 3459 | * Interrupted receive. Update the read |
| 3460 | * pointer and byte count, and return |
| 3461 | * an interrupted indication. |
| 3462 | */ |
| 3463 | p->bp = bp; |
| 3464 | p->cc = cc; |
| 3465 | return -3; |
| 3466 | } |
| 3467 | if (bytes_read == 0) |
| 3468 | { |
| 3469 | /* |
| 3470 | * EOF - server terminated the connection. |
| 3471 | * Update the read pointer and byte count, and |
| 3472 | * return an error indication. |
| 3473 | */ |
Haibo Huang | ee759ce | 2021-01-05 21:34:29 -0800 | [diff] [blame] | 3474 | snprintf(p->errbuf, PCAP_ERRBUF_SIZE, |
Haibo Huang | 165065a | 2018-07-23 17:26:52 -0700 | [diff] [blame] | 3475 | "The server terminated the connection."); |
| 3476 | return -1; |
| 3477 | } |
| 3478 | bp += bytes_read; |
| 3479 | cc += bytes_read; |
| 3480 | } |
| 3481 | p->bp = bp; |
| 3482 | p->cc = cc; |
Elliott Hughes | 965a4b5 | 2017-05-15 10:37:39 -0700 | [diff] [blame] | 3483 | return 0; |
| 3484 | } |