Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 5 | * Functions for returning the canonical host name of the remote site. |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 6 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 7 | * As far as I am concerned, the code I have written for this software |
| 8 | * can be used freely for any purpose. Any derived versions of this |
| 9 | * software must be clearly marked as such, and if the derived work is |
| 10 | * incompatible with the protocol description in the RFC file, it must be |
| 11 | * called by a name other than "ssh" or "Secure Shell". |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 12 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 13 | |
| 14 | #include "includes.h" |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame^] | 15 | RCSID("$OpenBSD: canohost.c,v 1.35 2002/11/26 02:38:54 stevesk Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 16 | |
| 17 | #include "packet.h" |
| 18 | #include "xmalloc.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 19 | #include "log.h" |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 20 | #include "canohost.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 21 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 22 | static void check_ip_options(int, char *); |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 23 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 24 | /* |
| 25 | * Return the canonical name of the host at the other end of the socket. The |
| 26 | * caller should free the returned string with xfree. |
| 27 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 28 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 29 | static char * |
Damien Miller | c5d8635 | 2002-02-05 12:13:41 +1100 | [diff] [blame] | 30 | get_remote_hostname(int socket, int verify_reverse_mapping) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 31 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 32 | struct sockaddr_storage from; |
| 33 | int i; |
| 34 | socklen_t fromlen; |
| 35 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 36 | char name[NI_MAXHOST], ntop[NI_MAXHOST], ntop2[NI_MAXHOST]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 37 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 38 | /* Get IP address of client. */ |
| 39 | fromlen = sizeof(from); |
| 40 | memset(&from, 0, sizeof(from)); |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame^] | 41 | if (getpeername(socket, (struct sockaddr *)&from, &fromlen) < 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 42 | debug("getpeername failed: %.100s", strerror(errno)); |
| 43 | fatal_cleanup(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 44 | } |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 45 | #ifdef IPV4_IN_IPV6 |
| 46 | if (from.ss_family == AF_INET6) { |
| 47 | struct sockaddr_in6 *from6 = (struct sockaddr_in6 *)&from; |
| 48 | |
| 49 | /* Detect IPv4 in IPv6 mapped address and convert it to */ |
| 50 | /* plain (AF_INET) IPv4 address */ |
| 51 | if (IN6_IS_ADDR_V4MAPPED(&from6->sin6_addr)) { |
| 52 | struct sockaddr_in *from4 = (struct sockaddr_in *)&from; |
| 53 | struct in_addr addr; |
| 54 | u_int16_t port; |
| 55 | |
| 56 | memcpy(&addr, ((char *)&from6->sin6_addr) + 12, sizeof(addr)); |
| 57 | port = from6->sin6_port; |
| 58 | |
| 59 | memset(&from, 0, sizeof(from)); |
Kevin Steves | ef4eea9 | 2001-02-05 12:42:17 +0000 | [diff] [blame] | 60 | |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 61 | from4->sin_family = AF_INET; |
| 62 | memcpy(&from4->sin_addr, &addr, sizeof(addr)); |
| 63 | from4->sin_port = port; |
| 64 | } |
| 65 | } |
| 66 | #endif |
| 67 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 68 | if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 69 | NULL, 0, NI_NUMERICHOST) != 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 70 | fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 71 | |
Ben Lindstrom | 9a17c9a | 2002-06-11 16:47:22 +0000 | [diff] [blame] | 72 | if (from.ss_family == AF_INET) |
| 73 | check_ip_options(socket, ntop); |
| 74 | |
Ben Lindstrom | 121c785 | 2001-04-18 15:32:44 +0000 | [diff] [blame] | 75 | debug3("Trying to reverse map address %.100s.", ntop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 76 | /* Map the IP address to a host name. */ |
| 77 | if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 78 | NULL, 0, NI_NAMEREQD) != 0) { |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 79 | /* Host name not found. Use ip address. */ |
Ben Lindstrom | e982773 | 2002-07-11 03:56:46 +0000 | [diff] [blame] | 80 | #if 0 |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 81 | log("Could not reverse map address %.100s.", ntop); |
Ben Lindstrom | e982773 | 2002-07-11 03:56:46 +0000 | [diff] [blame] | 82 | #endif |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 83 | return xstrdup(ntop); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 84 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 86 | /* Got host name. */ |
| 87 | name[sizeof(name) - 1] = '\0'; |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 88 | /* |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 89 | * Convert it to all lowercase (which is expected by the rest |
| 90 | * of this software). |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 91 | */ |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 92 | for (i = 0; name[i]; i++) |
| 93 | if (isupper(name[i])) |
| 94 | name[i] = tolower(name[i]); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 95 | |
Damien Miller | c5d8635 | 2002-02-05 12:13:41 +1100 | [diff] [blame] | 96 | if (!verify_reverse_mapping) |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 97 | return xstrdup(name); |
| 98 | /* |
| 99 | * Map it back to an IP address and check that the given |
| 100 | * address actually is an address of this host. This is |
| 101 | * necessary because anyone with access to a name server can |
| 102 | * define arbitrary names for an IP address. Mapping from |
| 103 | * name to IP address can be trusted better (but can still be |
| 104 | * fooled if the intruder has access to the name server of |
| 105 | * the domain). |
| 106 | */ |
| 107 | memset(&hints, 0, sizeof(hints)); |
| 108 | hints.ai_family = from.ss_family; |
| 109 | hints.ai_socktype = SOCK_STREAM; |
| 110 | if (getaddrinfo(name, NULL, &hints, &aitop) != 0) { |
| 111 | log("reverse mapping checking getaddrinfo for %.700s " |
| 112 | "failed - POSSIBLE BREAKIN ATTEMPT!", name); |
| 113 | return xstrdup(ntop); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 114 | } |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 115 | /* Look for the address from the list of addresses. */ |
| 116 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 117 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2, |
| 118 | sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 && |
| 119 | (strcmp(ntop, ntop2) == 0)) |
| 120 | break; |
| 121 | } |
| 122 | freeaddrinfo(aitop); |
| 123 | /* If we reached the end of the list, the address was not there. */ |
| 124 | if (!ai) { |
| 125 | /* Address not found for the host name. */ |
| 126 | log("Address %.100s maps to %.600s, but this does not " |
| 127 | "map back to the address - POSSIBLE BREAKIN ATTEMPT!", |
| 128 | ntop, name); |
| 129 | return xstrdup(ntop); |
| 130 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 131 | return xstrdup(name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 132 | } |
| 133 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 134 | /* |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 135 | * If IP options are supported, make sure there are none (log and |
| 136 | * disconnect them if any are found). Basically we are worried about |
| 137 | * source routing; it can be used to pretend you are somebody |
| 138 | * (ip-address) you are not. That itself may be "almost acceptable" |
| 139 | * under certain circumstances, but rhosts autentication is useless |
| 140 | * if source routing is accepted. Notice also that if we just dropped |
| 141 | * source routing here, the other side could use IP spoofing to do |
| 142 | * rest of the interaction and could still bypass security. So we |
| 143 | * exit here if we detect any IP options. |
| 144 | */ |
| 145 | /* IPv4 only */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 146 | static void |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 147 | check_ip_options(int socket, char *ipaddr) |
| 148 | { |
Ben Lindstrom | 075390a | 2001-02-10 21:34:46 +0000 | [diff] [blame] | 149 | u_char options[200]; |
| 150 | char text[sizeof(options) * 3 + 1]; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 151 | socklen_t option_size; |
Ben Lindstrom | 075390a | 2001-02-10 21:34:46 +0000 | [diff] [blame] | 152 | int i, ipproto; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 153 | struct protoent *ip; |
| 154 | |
| 155 | if ((ip = getprotobyname("ip")) != NULL) |
| 156 | ipproto = ip->p_proto; |
| 157 | else |
| 158 | ipproto = IPPROTO_IP; |
| 159 | option_size = sizeof(options); |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 160 | if (getsockopt(socket, ipproto, IP_OPTIONS, options, |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 161 | &option_size) >= 0 && option_size != 0) { |
Ben Lindstrom | 075390a | 2001-02-10 21:34:46 +0000 | [diff] [blame] | 162 | text[0] = '\0'; |
| 163 | for (i = 0; i < option_size; i++) |
| 164 | snprintf(text + i*3, sizeof(text) - i*3, |
| 165 | " %2.2x", options[i]); |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 166 | log("Connection from %.100s with IP options:%.800s", |
| 167 | ipaddr, text); |
| 168 | packet_disconnect("Connection from %.100s with IP options:%.800s", |
| 169 | ipaddr, text); |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 174 | * Return the canonical name of the host in the other side of the current |
| 175 | * connection. The host name is cached, so it is efficient to call this |
| 176 | * several times. |
| 177 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 178 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 179 | const char * |
Damien Miller | c5d8635 | 2002-02-05 12:13:41 +1100 | [diff] [blame] | 180 | get_canonical_hostname(int verify_reverse_mapping) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 181 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 182 | static char *canonical_host_name = NULL; |
Damien Miller | c5d8635 | 2002-02-05 12:13:41 +1100 | [diff] [blame] | 183 | static int verify_reverse_mapping_done = 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 184 | |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 185 | /* Check if we have previously retrieved name with same option. */ |
| 186 | if (canonical_host_name != NULL) { |
Damien Miller | c5d8635 | 2002-02-05 12:13:41 +1100 | [diff] [blame] | 187 | if (verify_reverse_mapping_done != verify_reverse_mapping) |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 188 | xfree(canonical_host_name); |
| 189 | else |
| 190 | return canonical_host_name; |
| 191 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 192 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 193 | /* Get the real hostname if socket; otherwise return UNKNOWN. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 194 | if (packet_connection_is_on_socket()) |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 195 | canonical_host_name = get_remote_hostname( |
Damien Miller | c5d8635 | 2002-02-05 12:13:41 +1100 | [diff] [blame] | 196 | packet_get_connection_in(), verify_reverse_mapping); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 197 | else |
| 198 | canonical_host_name = xstrdup("UNKNOWN"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 199 | |
Damien Miller | c5d8635 | 2002-02-05 12:13:41 +1100 | [diff] [blame] | 200 | verify_reverse_mapping_done = verify_reverse_mapping; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 201 | return canonical_host_name; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 202 | } |
| 203 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 204 | /* |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame^] | 205 | * Returns the local/remote IP-address/hostname of socket as a string. |
| 206 | * The returned string must be freed. |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 207 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 208 | static char * |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 209 | get_socket_address(int socket, int remote, int flags) |
| 210 | { |
| 211 | struct sockaddr_storage addr; |
| 212 | socklen_t addrlen; |
| 213 | char ntop[NI_MAXHOST]; |
| 214 | |
| 215 | /* Get IP address of client. */ |
| 216 | addrlen = sizeof(addr); |
| 217 | memset(&addr, 0, sizeof(addr)); |
| 218 | |
| 219 | if (remote) { |
| 220 | if (getpeername(socket, (struct sockaddr *)&addr, &addrlen) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 221 | < 0) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 222 | return NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 223 | } else { |
| 224 | if (getsockname(socket, (struct sockaddr *)&addr, &addrlen) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 225 | < 0) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 226 | return NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 227 | } |
| 228 | /* Get the address in ascii. */ |
| 229 | if (getnameinfo((struct sockaddr *)&addr, addrlen, ntop, sizeof(ntop), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 230 | NULL, 0, flags) != 0) { |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame^] | 231 | error("get_socket_address: getnameinfo %d failed", flags); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 232 | return NULL; |
| 233 | } |
| 234 | return xstrdup(ntop); |
| 235 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 236 | |
| 237 | char * |
| 238 | get_peer_ipaddr(int socket) |
| 239 | { |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 240 | char *p; |
| 241 | |
| 242 | if ((p = get_socket_address(socket, 1, NI_NUMERICHOST)) != NULL) |
| 243 | return p; |
| 244 | return xstrdup("UNKNOWN"); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 245 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 246 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 247 | char * |
| 248 | get_local_ipaddr(int socket) |
| 249 | { |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 250 | char *p; |
| 251 | |
| 252 | if ((p = get_socket_address(socket, 0, NI_NUMERICHOST)) != NULL) |
| 253 | return p; |
| 254 | return xstrdup("UNKNOWN"); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 255 | } |
| 256 | |
| 257 | char * |
| 258 | get_local_name(int socket) |
| 259 | { |
| 260 | return get_socket_address(socket, 0, NI_NAMEREQD); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 264 | * Returns the IP-address of the remote host as a string. The returned |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 265 | * string must not be freed. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 266 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 267 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 268 | const char * |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 269 | get_remote_ipaddr(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 270 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 271 | static char *canonical_host_ip = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 272 | |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 273 | /* Check whether we have cached the ipaddr. */ |
| 274 | if (canonical_host_ip == NULL) { |
| 275 | if (packet_connection_is_on_socket()) { |
| 276 | canonical_host_ip = |
| 277 | get_peer_ipaddr(packet_get_connection_in()); |
| 278 | if (canonical_host_ip == NULL) |
| 279 | fatal_cleanup(); |
| 280 | } else { |
| 281 | /* If not on socket, return UNKNOWN. */ |
| 282 | canonical_host_ip = xstrdup("UNKNOWN"); |
| 283 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 284 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 285 | return canonical_host_ip; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 286 | } |
| 287 | |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 288 | const char * |
Damien Miller | c5d8635 | 2002-02-05 12:13:41 +1100 | [diff] [blame] | 289 | get_remote_name_or_ip(u_int utmp_len, int verify_reverse_mapping) |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 290 | { |
| 291 | static const char *remote = ""; |
| 292 | if (utmp_len > 0) |
Damien Miller | c5d8635 | 2002-02-05 12:13:41 +1100 | [diff] [blame] | 293 | remote = get_canonical_hostname(verify_reverse_mapping); |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 294 | if (utmp_len == 0 || strlen(remote) > utmp_len) |
| 295 | remote = get_remote_ipaddr(); |
| 296 | return remote; |
| 297 | } |
| 298 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 299 | /* Returns the local/remote port for the socket. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 300 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 301 | static int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 302 | get_sock_port(int sock, int local) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 303 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 304 | struct sockaddr_storage from; |
| 305 | socklen_t fromlen; |
| 306 | char strport[NI_MAXSERV]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 307 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 308 | /* Get IP address of client. */ |
| 309 | fromlen = sizeof(from); |
| 310 | memset(&from, 0, sizeof(from)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 311 | if (local) { |
| 312 | if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
| 313 | error("getsockname failed: %.100s", strerror(errno)); |
| 314 | return 0; |
| 315 | } |
| 316 | } else { |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame^] | 317 | if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 318 | debug("getpeername failed: %.100s", strerror(errno)); |
| 319 | fatal_cleanup(); |
| 320 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 321 | } |
| 322 | /* Return port number. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 323 | if (getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 324 | strport, sizeof(strport), NI_NUMERICSERV) != 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 325 | fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed"); |
| 326 | return atoi(strport); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 327 | } |
| 328 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 329 | /* Returns remote/local port number for the current connection. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 330 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 331 | static int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 332 | get_port(int local) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 333 | { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 334 | /* |
| 335 | * If the connection is not a socket, return 65535. This is |
| 336 | * intentionally chosen to be an unprivileged port number. |
| 337 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 338 | if (!packet_connection_is_on_socket()) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 339 | return 65535; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 340 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 341 | /* Get socket and return the port number. */ |
| 342 | return get_sock_port(packet_get_connection_in(), local); |
| 343 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 344 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 345 | int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 346 | get_peer_port(int sock) |
| 347 | { |
| 348 | return get_sock_port(sock, 0); |
| 349 | } |
| 350 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 351 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 352 | get_remote_port(void) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 353 | { |
| 354 | return get_port(0); |
| 355 | } |
| 356 | |
| 357 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 358 | get_local_port(void) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 359 | { |
| 360 | return get_port(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 361 | } |