The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 1 | /* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */ |
| 2 | /* |
| 3 | * Copyright (c) 1994, 1995, 1996, 1997, 1998 |
| 4 | * The Regents of the University of California. 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 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * 3. All advertising materials mentioning features or use of this software |
| 15 | * must display the following acknowledgement: |
| 16 | * This product includes software developed by the Computer Systems |
| 17 | * Engineering Group at Lawrence Berkeley Laboratory. |
| 18 | * 4. Neither the name of the University nor of the Laboratory may be used |
| 19 | * to endorse or promote products derived from this software without |
| 20 | * specific prior written permission. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | */ |
| 34 | |
| 35 | #ifndef lint |
| 36 | static const char rcsid[] _U_ = |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 37 | "@(#) $Header: /tcpdump/master/libpcap/fad-getad.c,v 1.12 2007-09-14 00:44:55 guy Exp $ (LBL)"; |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 38 | #endif |
| 39 | |
| 40 | #ifdef HAVE_CONFIG_H |
| 41 | #include "config.h" |
| 42 | #endif |
| 43 | |
| 44 | #include <sys/types.h> |
| 45 | #include <sys/socket.h> |
| 46 | #include <netinet/in.h> |
| 47 | |
| 48 | #include <net/if.h> |
| 49 | |
| 50 | #include <ctype.h> |
| 51 | #include <errno.h> |
| 52 | #include <stdio.h> |
| 53 | #include <stdlib.h> |
| 54 | #include <string.h> |
| 55 | #include <ifaddrs.h> |
| 56 | |
| 57 | #include "pcap-int.h" |
| 58 | |
| 59 | #ifdef HAVE_OS_PROTO_H |
| 60 | #include "os-proto.h" |
| 61 | #endif |
| 62 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 63 | /* |
| 64 | * We don't do this on Solaris 11 and later, as it appears there aren't |
| 65 | * any AF_PACKET addresses on interfaces, so we don't need this, and |
| 66 | * we end up including both the OS's <net/bpf.h> and our <pcap/bpf.h>, |
| 67 | * and their definitions of some data structures collide. |
| 68 | */ |
| 69 | #if (defined(linux) || defined(__Lynx__)) && defined(AF_PACKET) |
| 70 | # ifdef HAVE_NETPACKET_PACKET_H |
| 71 | /* Linux distributions with newer glibc */ |
| 72 | # include <netpacket/packet.h> |
| 73 | # else /* HAVE_NETPACKET_PACKET_H */ |
| 74 | /* LynxOS, Linux distributions with older glibc */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 75 | # ifdef __Lynx__ |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 76 | /* LynxOS */ |
| 77 | # include <netpacket/if_packet.h> |
| 78 | # else /* __Lynx__ */ |
| 79 | /* Linux */ |
| 80 | # include <linux/types.h> |
| 81 | # include <linux/if_packet.h> |
| 82 | # endif /* __Lynx__ */ |
| 83 | # endif /* HAVE_NETPACKET_PACKET_H */ |
| 84 | #endif /* (defined(linux) || defined(__Lynx__)) && defined(AF_PACKET) */ |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 85 | |
| 86 | /* |
| 87 | * This is fun. |
| 88 | * |
| 89 | * In older BSD systems, socket addresses were fixed-length, and |
| 90 | * "sizeof (struct sockaddr)" gave the size of the structure. |
| 91 | * All addresses fit within a "struct sockaddr". |
| 92 | * |
| 93 | * In newer BSD systems, the socket address is variable-length, and |
| 94 | * there's an "sa_len" field giving the length of the structure; |
| 95 | * this allows socket addresses to be longer than 2 bytes of family |
| 96 | * and 14 bytes of data. |
| 97 | * |
| 98 | * Some commercial UNIXes use the old BSD scheme, some use the RFC 2553 |
| 99 | * variant of the old BSD scheme (with "struct sockaddr_storage" rather |
| 100 | * than "struct sockaddr"), and some use the new BSD scheme. |
| 101 | * |
| 102 | * Some versions of GNU libc use neither scheme, but has an "SA_LEN()" |
| 103 | * macro that determines the size based on the address family. Other |
| 104 | * versions don't have "SA_LEN()" (as it was in drafts of RFC 2553 |
| 105 | * but not in the final version). On the latter systems, we explicitly |
| 106 | * check the AF_ type to determine the length; we assume that on |
| 107 | * all those systems we have "struct sockaddr_storage". |
| 108 | */ |
| 109 | #ifndef SA_LEN |
| 110 | #ifdef HAVE_SOCKADDR_SA_LEN |
| 111 | #define SA_LEN(addr) ((addr)->sa_len) |
| 112 | #else /* HAVE_SOCKADDR_SA_LEN */ |
| 113 | #ifdef HAVE_SOCKADDR_STORAGE |
| 114 | static size_t |
| 115 | get_sa_len(struct sockaddr *addr) |
| 116 | { |
| 117 | switch (addr->sa_family) { |
| 118 | |
| 119 | #ifdef AF_INET |
| 120 | case AF_INET: |
| 121 | return (sizeof (struct sockaddr_in)); |
| 122 | #endif |
| 123 | |
| 124 | #ifdef AF_INET6 |
| 125 | case AF_INET6: |
| 126 | return (sizeof (struct sockaddr_in6)); |
| 127 | #endif |
| 128 | |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 129 | #if (defined(linux) || defined(__Lynx__)) && defined(AF_PACKET) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 130 | case AF_PACKET: |
| 131 | return (sizeof (struct sockaddr_ll)); |
| 132 | #endif |
| 133 | |
| 134 | default: |
| 135 | return (sizeof (struct sockaddr)); |
| 136 | } |
| 137 | } |
| 138 | #define SA_LEN(addr) (get_sa_len(addr)) |
| 139 | #else /* HAVE_SOCKADDR_STORAGE */ |
| 140 | #define SA_LEN(addr) (sizeof (struct sockaddr)) |
| 141 | #endif /* HAVE_SOCKADDR_STORAGE */ |
| 142 | #endif /* HAVE_SOCKADDR_SA_LEN */ |
| 143 | #endif /* SA_LEN */ |
| 144 | |
| 145 | /* |
| 146 | * Get a list of all interfaces that are up and that we can open. |
| 147 | * Returns -1 on error, 0 otherwise. |
| 148 | * The list, as returned through "alldevsp", may be null if no interfaces |
| 149 | * were up and could be opened. |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 150 | */ |
| 151 | int |
JP Abgrall | 511eca3 | 2014-02-12 13:46:45 -0800 | [diff] [blame] | 152 | pcap_findalldevs_interfaces(pcap_if_t **alldevsp, char *errbuf) |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 153 | { |
| 154 | pcap_if_t *devlist = NULL; |
| 155 | struct ifaddrs *ifap, *ifa; |
| 156 | struct sockaddr *addr, *netmask, *broadaddr, *dstaddr; |
| 157 | size_t addr_size, broadaddr_size, dstaddr_size; |
| 158 | int ret = 0; |
| 159 | char *p, *q; |
| 160 | |
| 161 | /* |
| 162 | * Get the list of interface addresses. |
| 163 | * |
| 164 | * Note: this won't return information about interfaces |
| 165 | * with no addresses; are there any such interfaces |
| 166 | * that would be capable of receiving packets? |
| 167 | * (Interfaces incapable of receiving packets aren't |
| 168 | * very interesting from libpcap's point of view.) |
| 169 | * |
| 170 | * LAN interfaces will probably have link-layer |
| 171 | * addresses; I don't know whether all implementations |
| 172 | * of "getifaddrs()" now, or in the future, will return |
| 173 | * those. |
| 174 | */ |
| 175 | if (getifaddrs(&ifap) != 0) { |
| 176 | (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, |
| 177 | "getifaddrs: %s", pcap_strerror(errno)); |
| 178 | return (-1); |
| 179 | } |
| 180 | for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) { |
| 181 | /* |
| 182 | * Is this interface up? |
| 183 | */ |
| 184 | if (!(ifa->ifa_flags & IFF_UP)) { |
| 185 | /* |
| 186 | * No, so don't add it to the list. |
| 187 | */ |
| 188 | continue; |
| 189 | } |
| 190 | |
| 191 | /* |
| 192 | * "ifa_addr" was apparently null on at least one |
| 193 | * interface on some system. |
| 194 | * |
| 195 | * "ifa_broadaddr" may be non-null even on |
| 196 | * non-broadcast interfaces, and was null on |
| 197 | * at least one OpenBSD 3.4 system on at least |
| 198 | * one interface with IFF_BROADCAST set. |
| 199 | * |
| 200 | * "ifa_dstaddr" was, on at least one FreeBSD 4.1 |
| 201 | * system, non-null on a non-point-to-point |
| 202 | * interface. |
| 203 | * |
| 204 | * Therefore, we supply the address and netmask only |
| 205 | * if "ifa_addr" is non-null (if there's no address, |
| 206 | * there's obviously no netmask), and supply the |
| 207 | * broadcast and destination addresses if the appropriate |
| 208 | * flag is set *and* the appropriate "ifa_" entry doesn't |
| 209 | * evaluate to a null pointer. |
| 210 | */ |
| 211 | if (ifa->ifa_addr != NULL) { |
| 212 | addr = ifa->ifa_addr; |
| 213 | addr_size = SA_LEN(addr); |
| 214 | netmask = ifa->ifa_netmask; |
| 215 | } else { |
| 216 | addr = NULL; |
| 217 | addr_size = 0; |
| 218 | netmask = NULL; |
| 219 | } |
| 220 | if (ifa->ifa_flags & IFF_BROADCAST && |
| 221 | ifa->ifa_broadaddr != NULL) { |
| 222 | broadaddr = ifa->ifa_broadaddr; |
| 223 | broadaddr_size = SA_LEN(broadaddr); |
| 224 | } else { |
| 225 | broadaddr = NULL; |
| 226 | broadaddr_size = 0; |
| 227 | } |
| 228 | if (ifa->ifa_flags & IFF_POINTOPOINT && |
| 229 | ifa->ifa_dstaddr != NULL) { |
| 230 | dstaddr = ifa->ifa_dstaddr; |
| 231 | dstaddr_size = SA_LEN(ifa->ifa_dstaddr); |
| 232 | } else { |
| 233 | dstaddr = NULL; |
| 234 | dstaddr_size = 0; |
| 235 | } |
| 236 | |
| 237 | /* |
| 238 | * If this entry has a colon followed by a number at |
| 239 | * the end, we assume it's a logical interface. Those |
| 240 | * are just the way you assign multiple IP addresses to |
| 241 | * a real interface on Linux, so an entry for a logical |
| 242 | * interface should be treated like the entry for the |
| 243 | * real interface; we do that by stripping off the ":" |
| 244 | * and the number. |
| 245 | * |
| 246 | * XXX - should we do this only on Linux? |
| 247 | */ |
| 248 | p = strchr(ifa->ifa_name, ':'); |
| 249 | if (p != NULL) { |
| 250 | /* |
| 251 | * We have a ":"; is it followed by a number? |
| 252 | */ |
| 253 | q = p + 1; |
| 254 | while (isdigit((unsigned char)*q)) |
| 255 | q++; |
| 256 | if (*q == '\0') { |
| 257 | /* |
| 258 | * All digits after the ":" until the end. |
| 259 | * Strip off the ":" and everything after |
| 260 | * it. |
| 261 | */ |
| 262 | *p = '\0'; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * Add information for this address to the list. |
| 268 | */ |
| 269 | if (add_addr_to_iflist(&devlist, ifa->ifa_name, |
| 270 | ifa->ifa_flags, addr, addr_size, netmask, addr_size, |
| 271 | broadaddr, broadaddr_size, dstaddr, dstaddr_size, |
| 272 | errbuf) < 0) { |
| 273 | ret = -1; |
| 274 | break; |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | freeifaddrs(ifap); |
| 279 | |
The Android Open Source Project | 478ab6c | 2009-03-03 19:30:05 -0800 | [diff] [blame] | 280 | if (ret == -1) { |
| 281 | /* |
| 282 | * We had an error; free the list we've been constructing. |
| 283 | */ |
| 284 | if (devlist != NULL) { |
| 285 | pcap_freealldevs(devlist); |
| 286 | devlist = NULL; |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | *alldevsp = devlist; |
| 291 | return (ret); |
| 292 | } |