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" |
Darren Tucker | d04121f | 2004-04-19 22:16:53 +1000 | [diff] [blame] | 15 | RCSID("$OpenBSD: canohost.c,v 1.39 2004/03/31 21:58:47 djm 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 | 927f527 | 2003-11-24 12:57:25 +1100 | [diff] [blame] | 23 | static void ipv64_normalise_mapped(struct sockaddr_storage *, socklen_t *); |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 24 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 25 | /* |
| 26 | * Return the canonical name of the host at the other end of the socket. The |
| 27 | * caller should free the returned string with xfree. |
| 28 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 29 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 30 | static char * |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 31 | get_remote_hostname(int socket, int use_dns) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 32 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 33 | struct sockaddr_storage from; |
| 34 | int i; |
| 35 | socklen_t fromlen; |
| 36 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 37 | char name[NI_MAXHOST], ntop[NI_MAXHOST], ntop2[NI_MAXHOST]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 38 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 39 | /* Get IP address of client. */ |
| 40 | fromlen = sizeof(from); |
| 41 | memset(&from, 0, sizeof(from)); |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame] | 42 | if (getpeername(socket, (struct sockaddr *)&from, &fromlen) < 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 43 | debug("getpeername failed: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 44 | cleanup_exit(255); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 45 | } |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 46 | |
Damien Miller | ccea020 | 2004-03-31 15:17:54 +1000 | [diff] [blame] | 47 | if (from.ss_family == AF_INET) |
| 48 | check_ip_options(socket, ntop); |
| 49 | |
Damien Miller | 927f527 | 2003-11-24 12:57:25 +1100 | [diff] [blame] | 50 | ipv64_normalise_mapped(&from, &fromlen); |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 51 | |
Damien Miller | 5e4471e | 2003-01-07 10:51:23 +1100 | [diff] [blame] | 52 | if (from.ss_family == AF_INET6) |
| 53 | fromlen = sizeof(struct sockaddr_in6); |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 54 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 55 | if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 56 | NULL, 0, NI_NUMERICHOST) != 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 57 | fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 58 | |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 59 | if (!use_dns) |
| 60 | return xstrdup(ntop); |
| 61 | |
Ben Lindstrom | 121c785 | 2001-04-18 15:32:44 +0000 | [diff] [blame] | 62 | debug3("Trying to reverse map address %.100s.", ntop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 63 | /* Map the IP address to a host name. */ |
| 64 | if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 65 | NULL, 0, NI_NAMEREQD) != 0) { |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 66 | /* Host name not found. Use ip address. */ |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 67 | return xstrdup(ntop); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 68 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 69 | |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 70 | /* |
| 71 | * if reverse lookup result looks like a numeric hostname, |
| 72 | * someone is trying to trick us by PTR record like following: |
| 73 | * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5 |
| 74 | */ |
| 75 | memset(&hints, 0, sizeof(hints)); |
| 76 | hints.ai_socktype = SOCK_DGRAM; /*dummy*/ |
Darren Tucker | 0f68486 | 2003-06-05 09:52:42 +1000 | [diff] [blame] | 77 | hints.ai_flags = AI_NUMERICHOST; |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 78 | if (getaddrinfo(name, "0", &hints, &ai) == 0) { |
| 79 | logit("Nasty PTR record \"%s\" is set up for %s, ignoring", |
| 80 | name, ntop); |
| 81 | freeaddrinfo(ai); |
| 82 | return xstrdup(ntop); |
| 83 | } |
| 84 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 85 | /* |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 86 | * Convert it to all lowercase (which is expected by the rest |
| 87 | * of this software). |
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 | for (i = 0; name[i]; i++) |
| 90 | if (isupper(name[i])) |
| 91 | name[i] = tolower(name[i]); |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 92 | /* |
| 93 | * Map it back to an IP address and check that the given |
| 94 | * address actually is an address of this host. This is |
| 95 | * necessary because anyone with access to a name server can |
| 96 | * define arbitrary names for an IP address. Mapping from |
| 97 | * name to IP address can be trusted better (but can still be |
| 98 | * fooled if the intruder has access to the name server of |
| 99 | * the domain). |
| 100 | */ |
| 101 | memset(&hints, 0, sizeof(hints)); |
| 102 | hints.ai_family = from.ss_family; |
| 103 | hints.ai_socktype = SOCK_STREAM; |
| 104 | if (getaddrinfo(name, NULL, &hints, &aitop) != 0) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 105 | logit("reverse mapping checking getaddrinfo for %.700s " |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 106 | "failed - POSSIBLE BREAKIN ATTEMPT!", name); |
| 107 | return xstrdup(ntop); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 108 | } |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 109 | /* Look for the address from the list of addresses. */ |
| 110 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 111 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2, |
| 112 | sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 && |
| 113 | (strcmp(ntop, ntop2) == 0)) |
| 114 | break; |
| 115 | } |
| 116 | freeaddrinfo(aitop); |
| 117 | /* If we reached the end of the list, the address was not there. */ |
| 118 | if (!ai) { |
| 119 | /* Address not found for the host name. */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 120 | logit("Address %.100s maps to %.600s, but this does not " |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 121 | "map back to the address - POSSIBLE BREAKIN ATTEMPT!", |
| 122 | ntop, name); |
| 123 | return xstrdup(ntop); |
| 124 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 125 | return xstrdup(name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 126 | } |
| 127 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 128 | /* |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 129 | * If IP options are supported, make sure there are none (log and |
| 130 | * disconnect them if any are found). Basically we are worried about |
| 131 | * source routing; it can be used to pretend you are somebody |
| 132 | * (ip-address) you are not. That itself may be "almost acceptable" |
| 133 | * under certain circumstances, but rhosts autentication is useless |
| 134 | * if source routing is accepted. Notice also that if we just dropped |
| 135 | * source routing here, the other side could use IP spoofing to do |
| 136 | * rest of the interaction and could still bypass security. So we |
| 137 | * exit here if we detect any IP options. |
| 138 | */ |
| 139 | /* IPv4 only */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 140 | static void |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 141 | check_ip_options(int socket, char *ipaddr) |
| 142 | { |
Darren Tucker | 89f4cf0 | 2003-08-07 13:29:04 +1000 | [diff] [blame] | 143 | #ifdef IP_OPTIONS |
Ben Lindstrom | 075390a | 2001-02-10 21:34:46 +0000 | [diff] [blame] | 144 | u_char options[200]; |
| 145 | char text[sizeof(options) * 3 + 1]; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 146 | socklen_t option_size; |
Ben Lindstrom | 075390a | 2001-02-10 21:34:46 +0000 | [diff] [blame] | 147 | int i, ipproto; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 148 | struct protoent *ip; |
| 149 | |
| 150 | if ((ip = getprotobyname("ip")) != NULL) |
| 151 | ipproto = ip->p_proto; |
| 152 | else |
| 153 | ipproto = IPPROTO_IP; |
| 154 | option_size = sizeof(options); |
Ben Lindstrom | 733a235 | 2002-03-05 01:31:28 +0000 | [diff] [blame] | 155 | if (getsockopt(socket, ipproto, IP_OPTIONS, options, |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 156 | &option_size) >= 0 && option_size != 0) { |
Ben Lindstrom | 075390a | 2001-02-10 21:34:46 +0000 | [diff] [blame] | 157 | text[0] = '\0'; |
| 158 | for (i = 0; i < option_size; i++) |
| 159 | snprintf(text + i*3, sizeof(text) - i*3, |
| 160 | " %2.2x", options[i]); |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 161 | logit("Connection from %.100s with IP options:%.800s", |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 162 | ipaddr, text); |
| 163 | packet_disconnect("Connection from %.100s with IP options:%.800s", |
| 164 | ipaddr, text); |
| 165 | } |
Darren Tucker | 89f4cf0 | 2003-08-07 13:29:04 +1000 | [diff] [blame] | 166 | #endif /* IP_OPTIONS */ |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 167 | } |
| 168 | |
Damien Miller | 927f527 | 2003-11-24 12:57:25 +1100 | [diff] [blame] | 169 | static void |
| 170 | ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len) |
| 171 | { |
| 172 | struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)addr; |
| 173 | struct sockaddr_in *a4 = (struct sockaddr_in *)addr; |
| 174 | struct in_addr inaddr; |
| 175 | u_int16_t port; |
| 176 | |
| 177 | if (addr->ss_family != AF_INET6 || |
| 178 | !IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr)) |
| 179 | return; |
| 180 | |
| 181 | debug3("Normalising mapped IPv4 in IPv6 address"); |
| 182 | |
| 183 | memcpy(&inaddr, ((char *)&a6->sin6_addr) + 12, sizeof(inaddr)); |
| 184 | port = a6->sin6_port; |
| 185 | |
| 186 | memset(addr, 0, sizeof(*a4)); |
| 187 | |
| 188 | a4->sin_family = AF_INET; |
| 189 | *len = sizeof(*a4); |
| 190 | memcpy(&a4->sin_addr, &inaddr, sizeof(inaddr)); |
| 191 | a4->sin_port = port; |
| 192 | } |
| 193 | |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 194 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 195 | * Return the canonical name of the host in the other side of the current |
| 196 | * connection. The host name is cached, so it is efficient to call this |
| 197 | * several times. |
| 198 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 199 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 200 | const char * |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 201 | get_canonical_hostname(int use_dns) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 202 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 203 | static char *canonical_host_name = NULL; |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 204 | static int use_dns_done = 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 205 | |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 206 | /* Check if we have previously retrieved name with same option. */ |
| 207 | if (canonical_host_name != NULL) { |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 208 | if (use_dns_done != use_dns) |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 209 | xfree(canonical_host_name); |
| 210 | else |
| 211 | return canonical_host_name; |
| 212 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 213 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 214 | /* Get the real hostname if socket; otherwise return UNKNOWN. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 215 | if (packet_connection_is_on_socket()) |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 216 | canonical_host_name = get_remote_hostname( |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 217 | packet_get_connection_in(), use_dns); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 218 | else |
| 219 | canonical_host_name = xstrdup("UNKNOWN"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 220 | |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 221 | use_dns_done = use_dns; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 222 | return canonical_host_name; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 223 | } |
| 224 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 225 | /* |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame] | 226 | * Returns the local/remote IP-address/hostname of socket as a string. |
| 227 | * The returned string must be freed. |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 228 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 229 | static char * |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 230 | get_socket_address(int socket, int remote, int flags) |
| 231 | { |
| 232 | struct sockaddr_storage addr; |
| 233 | socklen_t addrlen; |
| 234 | char ntop[NI_MAXHOST]; |
| 235 | |
| 236 | /* Get IP address of client. */ |
| 237 | addrlen = sizeof(addr); |
| 238 | memset(&addr, 0, sizeof(addr)); |
| 239 | |
| 240 | if (remote) { |
| 241 | if (getpeername(socket, (struct sockaddr *)&addr, &addrlen) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 242 | < 0) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 243 | return NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 244 | } else { |
| 245 | if (getsockname(socket, (struct sockaddr *)&addr, &addrlen) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 246 | < 0) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 247 | return NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 248 | } |
Damien Miller | 5e4471e | 2003-01-07 10:51:23 +1100 | [diff] [blame] | 249 | |
| 250 | /* Work around Linux IPv6 weirdness */ |
| 251 | if (addr.ss_family == AF_INET6) |
| 252 | addrlen = sizeof(struct sockaddr_in6); |
| 253 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 254 | /* Get the address in ascii. */ |
| 255 | if (getnameinfo((struct sockaddr *)&addr, addrlen, ntop, sizeof(ntop), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 256 | NULL, 0, flags) != 0) { |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame] | 257 | error("get_socket_address: getnameinfo %d failed", flags); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 258 | return NULL; |
| 259 | } |
| 260 | return xstrdup(ntop); |
| 261 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 262 | |
| 263 | char * |
| 264 | get_peer_ipaddr(int socket) |
| 265 | { |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 266 | char *p; |
| 267 | |
| 268 | if ((p = get_socket_address(socket, 1, NI_NUMERICHOST)) != NULL) |
| 269 | return p; |
| 270 | return xstrdup("UNKNOWN"); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 271 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 272 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 273 | char * |
| 274 | get_local_ipaddr(int socket) |
| 275 | { |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 276 | char *p; |
| 277 | |
| 278 | if ((p = get_socket_address(socket, 0, NI_NUMERICHOST)) != NULL) |
| 279 | return p; |
| 280 | return xstrdup("UNKNOWN"); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 281 | } |
| 282 | |
| 283 | char * |
| 284 | get_local_name(int socket) |
| 285 | { |
| 286 | return get_socket_address(socket, 0, NI_NAMEREQD); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 287 | } |
| 288 | |
| 289 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 290 | * 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] | 291 | * string must not be freed. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 292 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 293 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 294 | const char * |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 295 | get_remote_ipaddr(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 296 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 297 | static char *canonical_host_ip = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 298 | |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 299 | /* Check whether we have cached the ipaddr. */ |
| 300 | if (canonical_host_ip == NULL) { |
| 301 | if (packet_connection_is_on_socket()) { |
| 302 | canonical_host_ip = |
| 303 | get_peer_ipaddr(packet_get_connection_in()); |
| 304 | if (canonical_host_ip == NULL) |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 305 | cleanup_exit(255); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 306 | } else { |
| 307 | /* If not on socket, return UNKNOWN. */ |
| 308 | canonical_host_ip = xstrdup("UNKNOWN"); |
| 309 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 310 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 311 | return canonical_host_ip; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 312 | } |
| 313 | |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 314 | const char * |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 315 | get_remote_name_or_ip(u_int utmp_len, int use_dns) |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 316 | { |
| 317 | static const char *remote = ""; |
| 318 | if (utmp_len > 0) |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 319 | remote = get_canonical_hostname(use_dns); |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 320 | if (utmp_len == 0 || strlen(remote) > utmp_len) |
| 321 | remote = get_remote_ipaddr(); |
| 322 | return remote; |
| 323 | } |
| 324 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 325 | /* Returns the local/remote port for the socket. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 326 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 327 | static int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 328 | get_sock_port(int sock, int local) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 329 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 330 | struct sockaddr_storage from; |
| 331 | socklen_t fromlen; |
| 332 | char strport[NI_MAXSERV]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 333 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 334 | /* Get IP address of client. */ |
| 335 | fromlen = sizeof(from); |
| 336 | memset(&from, 0, sizeof(from)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 337 | if (local) { |
| 338 | if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
| 339 | error("getsockname failed: %.100s", strerror(errno)); |
| 340 | return 0; |
| 341 | } |
| 342 | } else { |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame] | 343 | if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 344 | debug("getpeername failed: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 345 | cleanup_exit(255); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 346 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 347 | } |
Damien Miller | 5e4471e | 2003-01-07 10:51:23 +1100 | [diff] [blame] | 348 | |
| 349 | /* Work around Linux IPv6 weirdness */ |
| 350 | if (from.ss_family == AF_INET6) |
| 351 | fromlen = sizeof(struct sockaddr_in6); |
| 352 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 353 | /* Return port number. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 354 | if (getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0, |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 355 | strport, sizeof(strport), NI_NUMERICSERV) != 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 356 | fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed"); |
| 357 | return atoi(strport); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 358 | } |
| 359 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 360 | /* Returns remote/local port number for the current connection. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 361 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 362 | static int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 363 | get_port(int local) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 364 | { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 365 | /* |
| 366 | * If the connection is not a socket, return 65535. This is |
| 367 | * intentionally chosen to be an unprivileged port number. |
| 368 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 369 | if (!packet_connection_is_on_socket()) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 370 | return 65535; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 371 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 372 | /* Get socket and return the port number. */ |
| 373 | return get_sock_port(packet_get_connection_in(), local); |
| 374 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 375 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 376 | int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 377 | get_peer_port(int sock) |
| 378 | { |
| 379 | return get_sock_port(sock, 0); |
| 380 | } |
| 381 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 382 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 383 | get_remote_port(void) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 384 | { |
| 385 | return get_port(0); |
| 386 | } |
| 387 | |
| 388 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 389 | get_local_port(void) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 390 | { |
| 391 | return get_port(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 392 | } |