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Darren Tuckera627d422013-06-02 07:31:17 +10001/* $OpenBSD: canohost.c,v 1.67 2013/05/17 00:13:13 djm Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Functions for returning the canonical host name of the remote site.
Damien Miller4af51302000-04-16 11:18:38 +10007 *
Damien Millere4340be2000-09-16 13:29:08 +11008 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
Damien Miller95def091999-11-25 00:26:21 +110013 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100014
15#include "includes.h"
Damien Millerc7b06362006-03-15 11:53:45 +110016
Damien Millere3b60b52006-07-10 21:08:03 +100017#include <sys/types.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100018#include <sys/socket.h>
19
20#include <netinet/in.h>
Darren Tuckerdace2332006-09-22 19:22:17 +100021#include <arpa/inet.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100022
Damien Millerc7b06362006-03-15 11:53:45 +110023#include <ctype.h>
Darren Tucker39972492006-07-12 22:22:46 +100024#include <errno.h>
Damien Millerb8fe89c2006-07-24 14:51:00 +100025#include <netdb.h>
Damien Millera7a73ee2006-08-05 11:37:59 +100026#include <stdio.h>
Damien Millere7a1e5c2006-08-05 11:34:19 +100027#include <stdlib.h>
Damien Millere3476ed2006-07-24 14:13:33 +100028#include <string.h>
Damien Millerd7834352006-08-05 12:39:39 +100029#include <stdarg.h>
Darren Tuckerdaaa4502010-01-13 22:43:33 +110030#include <unistd.h>
Damien Millerd4a8b7e1999-10-27 13:42:43 +100031
Damien Millerd4a8b7e1999-10-27 13:42:43 +100032#include "xmalloc.h"
Damien Millerd7834352006-08-05 12:39:39 +100033#include "packet.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000034#include "log.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000035#include "canohost.h"
Darren Tucker4abde772007-12-29 02:43:51 +110036#include "misc.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
Ben Lindstrombba81212001-06-25 05:01:22 +000038static void check_ip_options(int, char *);
Darren Tucker39c76322009-06-21 18:13:57 +100039static char *canonical_host_ip = NULL;
40static int cached_port = -1;
Damien Miller33804262001-02-04 23:20:18 +110041
Damien Miller5428f641999-11-25 11:54:57 +110042/*
43 * Return the canonical name of the host at the other end of the socket. The
Darren Tuckera627d422013-06-02 07:31:17 +100044 * caller should free the returned string.
Damien Miller5428f641999-11-25 11:54:57 +110045 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100046
Ben Lindstrombba81212001-06-25 05:01:22 +000047static char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +100048get_remote_hostname(int sock, int use_dns)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100049{
Damien Miller34132e52000-01-14 15:45:46 +110050 struct sockaddr_storage from;
51 int i;
52 socklen_t fromlen;
53 struct addrinfo hints, *ai, *aitop;
Damien Miller33804262001-02-04 23:20:18 +110054 char name[NI_MAXHOST], ntop[NI_MAXHOST], ntop2[NI_MAXHOST];
Damien Millerd4a8b7e1999-10-27 13:42:43 +100055
Damien Miller95def091999-11-25 00:26:21 +110056 /* Get IP address of client. */
57 fromlen = sizeof(from);
58 memset(&from, 0, sizeof(from));
Darren Tucker3f9fdc72004-06-22 12:56:01 +100059 if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) {
Damien Miller95def091999-11-25 00:26:21 +110060 debug("getpeername failed: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +100061 cleanup_exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100062 }
Damien Miller7bcb0892000-03-11 20:45:40 +110063
Damien Miller2eaf37d2006-04-18 15:13:16 +100064 if (from.ss_family == AF_INET)
65 check_ip_options(sock, ntop);
66
Damien Miller927f5272003-11-24 12:57:25 +110067 ipv64_normalise_mapped(&from, &fromlen);
Damien Miller7bcb0892000-03-11 20:45:40 +110068
Damien Miller5e4471e2003-01-07 10:51:23 +110069 if (from.ss_family == AF_INET6)
70 fromlen = sizeof(struct sockaddr_in6);
Damien Miller7bcb0892000-03-11 20:45:40 +110071
Damien Miller34132e52000-01-14 15:45:46 +110072 if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop),
Damien Miller9f0f5c62001-12-21 14:45:46 +110073 NULL, 0, NI_NUMERICHOST) != 0)
Damien Miller34132e52000-01-14 15:45:46 +110074 fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed");
Damien Miller95def091999-11-25 00:26:21 +110075
Damien Miller3a961dc2003-06-03 10:25:48 +100076 if (!use_dns)
77 return xstrdup(ntop);
78
Ben Lindstrom121c7852001-04-18 15:32:44 +000079 debug3("Trying to reverse map address %.100s.", ntop);
Damien Miller34132e52000-01-14 15:45:46 +110080 /* Map the IP address to a host name. */
81 if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name),
Damien Miller9f0f5c62001-12-21 14:45:46 +110082 NULL, 0, NI_NAMEREQD) != 0) {
Damien Miller33804262001-02-04 23:20:18 +110083 /* Host name not found. Use ip address. */
Damien Miller33804262001-02-04 23:20:18 +110084 return xstrdup(ntop);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100085 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +100086
Damien Miller3a961dc2003-06-03 10:25:48 +100087 /*
88 * if reverse lookup result looks like a numeric hostname,
89 * someone is trying to trick us by PTR record like following:
90 * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5
91 */
92 memset(&hints, 0, sizeof(hints));
93 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
Darren Tucker0f684862003-06-05 09:52:42 +100094 hints.ai_flags = AI_NUMERICHOST;
Darren Tucker30ac73b2008-06-13 04:46:45 +100095 if (getaddrinfo(name, NULL, &hints, &ai) == 0) {
Damien Miller3a961dc2003-06-03 10:25:48 +100096 logit("Nasty PTR record \"%s\" is set up for %s, ignoring",
97 name, ntop);
98 freeaddrinfo(ai);
99 return xstrdup(ntop);
100 }
101
Damien Miller5428f641999-11-25 11:54:57 +1100102 /*
Damien Miller33804262001-02-04 23:20:18 +1100103 * Convert it to all lowercase (which is expected by the rest
104 * of this software).
Damien Miller5428f641999-11-25 11:54:57 +1100105 */
Damien Miller33804262001-02-04 23:20:18 +1100106 for (i = 0; name[i]; i++)
107 if (isupper(name[i]))
Damien Miller1d2b6702006-03-26 14:09:54 +1100108 name[i] = (char)tolower(name[i]);
Damien Miller33804262001-02-04 23:20:18 +1100109 /*
110 * Map it back to an IP address and check that the given
111 * address actually is an address of this host. This is
112 * necessary because anyone with access to a name server can
113 * define arbitrary names for an IP address. Mapping from
114 * name to IP address can be trusted better (but can still be
115 * fooled if the intruder has access to the name server of
116 * the domain).
117 */
118 memset(&hints, 0, sizeof(hints));
119 hints.ai_family = from.ss_family;
120 hints.ai_socktype = SOCK_STREAM;
121 if (getaddrinfo(name, NULL, &hints, &aitop) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +1000122 logit("reverse mapping checking getaddrinfo for %.700s "
Damien Millerde85a282006-03-15 12:06:41 +1100123 "[%s] failed - POSSIBLE BREAK-IN ATTEMPT!", name, ntop);
Damien Miller33804262001-02-04 23:20:18 +1100124 return xstrdup(ntop);
Damien Miller95def091999-11-25 00:26:21 +1100125 }
Damien Miller33804262001-02-04 23:20:18 +1100126 /* Look for the address from the list of addresses. */
127 for (ai = aitop; ai; ai = ai->ai_next) {
128 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2,
129 sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 &&
130 (strcmp(ntop, ntop2) == 0))
131 break;
132 }
133 freeaddrinfo(aitop);
134 /* If we reached the end of the list, the address was not there. */
135 if (!ai) {
136 /* Address not found for the host name. */
Damien Miller996acd22003-04-09 20:59:48 +1000137 logit("Address %.100s maps to %.600s, but this does not "
Damien Miller5eb137c2005-12-31 16:19:53 +1100138 "map back to the address - POSSIBLE BREAK-IN ATTEMPT!",
Damien Miller33804262001-02-04 23:20:18 +1100139 ntop, name);
140 return xstrdup(ntop);
141 }
Damien Miller95def091999-11-25 00:26:21 +1100142 return xstrdup(name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000143}
144
Damien Miller5428f641999-11-25 11:54:57 +1100145/*
Damien Miller33804262001-02-04 23:20:18 +1100146 * If IP options are supported, make sure there are none (log and
147 * disconnect them if any are found). Basically we are worried about
148 * source routing; it can be used to pretend you are somebody
149 * (ip-address) you are not. That itself may be "almost acceptable"
150 * under certain circumstances, but rhosts autentication is useless
151 * if source routing is accepted. Notice also that if we just dropped
152 * source routing here, the other side could use IP spoofing to do
153 * rest of the interaction and could still bypass security. So we
154 * exit here if we detect any IP options.
155 */
156/* IPv4 only */
Ben Lindstrombba81212001-06-25 05:01:22 +0000157static void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000158check_ip_options(int sock, char *ipaddr)
Damien Miller33804262001-02-04 23:20:18 +1100159{
Darren Tucker89f4cf02003-08-07 13:29:04 +1000160#ifdef IP_OPTIONS
Ben Lindstrom075390a2001-02-10 21:34:46 +0000161 u_char options[200];
162 char text[sizeof(options) * 3 + 1];
Damien Miller33804262001-02-04 23:20:18 +1100163 socklen_t option_size;
Damien Millereccb9de2005-06-17 12:59:34 +1000164 u_int i;
165 int ipproto;
Damien Miller33804262001-02-04 23:20:18 +1100166 struct protoent *ip;
167
168 if ((ip = getprotobyname("ip")) != NULL)
169 ipproto = ip->p_proto;
170 else
171 ipproto = IPPROTO_IP;
172 option_size = sizeof(options);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000173 if (getsockopt(sock, ipproto, IP_OPTIONS, options,
Damien Miller33804262001-02-04 23:20:18 +1100174 &option_size) >= 0 && option_size != 0) {
Ben Lindstrom075390a2001-02-10 21:34:46 +0000175 text[0] = '\0';
176 for (i = 0; i < option_size; i++)
177 snprintf(text + i*3, sizeof(text) - i*3,
178 " %2.2x", options[i]);
Damien Miller4d3fd542005-11-05 15:13:24 +1100179 fatal("Connection from %.100s with IP options:%.800s",
Damien Miller33804262001-02-04 23:20:18 +1100180 ipaddr, text);
181 }
Darren Tucker89f4cf02003-08-07 13:29:04 +1000182#endif /* IP_OPTIONS */
Damien Miller33804262001-02-04 23:20:18 +1100183}
184
Darren Tucker2fba9932005-02-02 23:30:24 +1100185void
Damien Miller927f5272003-11-24 12:57:25 +1100186ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len)
187{
188 struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)addr;
189 struct sockaddr_in *a4 = (struct sockaddr_in *)addr;
190 struct in_addr inaddr;
191 u_int16_t port;
192
Damien Miller94cf4c82005-07-17 17:04:47 +1000193 if (addr->ss_family != AF_INET6 ||
Damien Miller927f5272003-11-24 12:57:25 +1100194 !IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr))
195 return;
196
197 debug3("Normalising mapped IPv4 in IPv6 address");
198
199 memcpy(&inaddr, ((char *)&a6->sin6_addr) + 12, sizeof(inaddr));
200 port = a6->sin6_port;
201
Damien Miller47e57bf2010-10-12 13:28:12 +1100202 bzero(a4, sizeof(*a4));
Damien Miller927f5272003-11-24 12:57:25 +1100203
204 a4->sin_family = AF_INET;
205 *len = sizeof(*a4);
206 memcpy(&a4->sin_addr, &inaddr, sizeof(inaddr));
207 a4->sin_port = port;
208}
209
Damien Miller33804262001-02-04 23:20:18 +1100210/*
Damien Miller5428f641999-11-25 11:54:57 +1100211 * Return the canonical name of the host in the other side of the current
212 * connection. The host name is cached, so it is efficient to call this
213 * several times.
214 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000215
Damien Miller95def091999-11-25 00:26:21 +1100216const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000217get_canonical_hostname(int use_dns)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000218{
Damien Miller24ecf612005-11-05 15:16:52 +1100219 char *host;
Damien Miller34132e52000-01-14 15:45:46 +1100220 static char *canonical_host_name = NULL;
Damien Miller24ecf612005-11-05 15:16:52 +1100221 static char *remote_ip = NULL;
Damien Miller34132e52000-01-14 15:45:46 +1100222
Damien Miller33804262001-02-04 23:20:18 +1100223 /* Check if we have previously retrieved name with same option. */
Damien Miller24ecf612005-11-05 15:16:52 +1100224 if (use_dns && canonical_host_name != NULL)
225 return canonical_host_name;
226 if (!use_dns && remote_ip != NULL)
227 return remote_ip;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000228
Damien Miller95def091999-11-25 00:26:21 +1100229 /* Get the real hostname if socket; otherwise return UNKNOWN. */
Damien Miller34132e52000-01-14 15:45:46 +1100230 if (packet_connection_is_on_socket())
Damien Miller24ecf612005-11-05 15:16:52 +1100231 host = get_remote_hostname(packet_get_connection_in(), use_dns);
Damien Miller95def091999-11-25 00:26:21 +1100232 else
Damien Miller24ecf612005-11-05 15:16:52 +1100233 host = "UNKNOWN";
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000234
Damien Miller24ecf612005-11-05 15:16:52 +1100235 if (use_dns)
236 canonical_host_name = host;
237 else
238 remote_ip = host;
239 return host;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000240}
241
Damien Miller5428f641999-11-25 11:54:57 +1100242/*
Ben Lindstromacaac972002-12-23 02:13:37 +0000243 * Returns the local/remote IP-address/hostname of socket as a string.
244 * The returned string must be freed.
Damien Millerd83ff352001-01-30 09:19:34 +1100245 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000246static char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000247get_socket_address(int sock, int remote, int flags)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000248{
249 struct sockaddr_storage addr;
250 socklen_t addrlen;
251 char ntop[NI_MAXHOST];
Damien Miller9b8073e2005-03-01 21:16:18 +1100252 int r;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000253
254 /* Get IP address of client. */
255 addrlen = sizeof(addr);
256 memset(&addr, 0, sizeof(addr));
257
258 if (remote) {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000259 if (getpeername(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000260 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000261 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000262 } else {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000263 if (getsockname(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000264 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000265 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000266 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100267
268 /* Work around Linux IPv6 weirdness */
269 if (addr.ss_family == AF_INET6)
270 addrlen = sizeof(struct sockaddr_in6);
271
Darren Tucker5b115d42005-05-03 19:05:32 +1000272 ipv64_normalise_mapped(&addr, &addrlen);
273
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000274 /* Get the address in ascii. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100275 if ((r = getnameinfo((struct sockaddr *)&addr, addrlen, ntop,
276 sizeof(ntop), NULL, 0, flags)) != 0) {
277 error("get_socket_address: getnameinfo %d failed: %s", flags,
Darren Tucker4abde772007-12-29 02:43:51 +1100278 ssh_gai_strerror(r));
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000279 return NULL;
280 }
281 return xstrdup(ntop);
282}
Damien Millerd83ff352001-01-30 09:19:34 +1100283
284char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000285get_peer_ipaddr(int sock)
Damien Millerd83ff352001-01-30 09:19:34 +1100286{
Damien Millerb2f844d2002-09-25 12:19:08 +1000287 char *p;
288
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000289 if ((p = get_socket_address(sock, 1, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000290 return p;
291 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000292}
Damien Millerd83ff352001-01-30 09:19:34 +1100293
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000294char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000295get_local_ipaddr(int sock)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000296{
Damien Millerb2f844d2002-09-25 12:19:08 +1000297 char *p;
298
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000299 if ((p = get_socket_address(sock, 0, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000300 return p;
301 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000302}
303
304char *
Darren Tuckerdaaa4502010-01-13 22:43:33 +1100305get_local_name(int fd)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000306{
Darren Tuckerdaaa4502010-01-13 22:43:33 +1100307 char *host, myname[NI_MAXHOST];
308
309 /* Assume we were passed a socket */
310 if ((host = get_socket_address(fd, 0, NI_NAMEREQD)) != NULL)
311 return host;
312
313 /* Handle the case where we were passed a pipe */
314 if (gethostname(myname, sizeof(myname)) == -1) {
315 verbose("get_local_name: gethostname: %s", strerror(errno));
316 } else {
317 host = xstrdup(myname);
318 }
319
320 return host;
Damien Millerd83ff352001-01-30 09:19:34 +1100321}
322
Darren Tucker39c76322009-06-21 18:13:57 +1000323void
324clear_cached_addr(void)
325{
Darren Tuckera627d422013-06-02 07:31:17 +1000326 free(canonical_host_ip);
327 canonical_host_ip = NULL;
Darren Tucker39c76322009-06-21 18:13:57 +1000328 cached_port = -1;
329}
330
Damien Millerd83ff352001-01-30 09:19:34 +1100331/*
Damien Miller5428f641999-11-25 11:54:57 +1100332 * Returns the IP-address of the remote host as a string. The returned
Damien Miller34132e52000-01-14 15:45:46 +1100333 * string must not be freed.
Damien Miller5428f641999-11-25 11:54:57 +1100334 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000335
Damien Miller95def091999-11-25 00:26:21 +1100336const char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000337get_remote_ipaddr(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000338{
Damien Millerd83ff352001-01-30 09:19:34 +1100339 /* Check whether we have cached the ipaddr. */
340 if (canonical_host_ip == NULL) {
341 if (packet_connection_is_on_socket()) {
342 canonical_host_ip =
343 get_peer_ipaddr(packet_get_connection_in());
344 if (canonical_host_ip == NULL)
Darren Tucker3e33cec2003-10-02 16:12:36 +1000345 cleanup_exit(255);
Damien Millerd83ff352001-01-30 09:19:34 +1100346 } else {
347 /* If not on socket, return UNKNOWN. */
348 canonical_host_ip = xstrdup("UNKNOWN");
349 }
Damien Miller95def091999-11-25 00:26:21 +1100350 }
Damien Miller95def091999-11-25 00:26:21 +1100351 return canonical_host_ip;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000352}
353
Ben Lindstromf15a3862001-04-05 23:32:17 +0000354const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000355get_remote_name_or_ip(u_int utmp_len, int use_dns)
Ben Lindstromf15a3862001-04-05 23:32:17 +0000356{
357 static const char *remote = "";
358 if (utmp_len > 0)
Damien Miller3a961dc2003-06-03 10:25:48 +1000359 remote = get_canonical_hostname(use_dns);
Ben Lindstromf15a3862001-04-05 23:32:17 +0000360 if (utmp_len == 0 || strlen(remote) > utmp_len)
361 remote = get_remote_ipaddr();
362 return remote;
363}
364
Damien Miller34132e52000-01-14 15:45:46 +1100365/* Returns the local/remote port for the socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000366
Damien Miller4bf648f2009-02-14 16:28:21 +1100367int
Damien Miller34132e52000-01-14 15:45:46 +1100368get_sock_port(int sock, int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000369{
Damien Miller34132e52000-01-14 15:45:46 +1100370 struct sockaddr_storage from;
371 socklen_t fromlen;
372 char strport[NI_MAXSERV];
Damien Miller9b8073e2005-03-01 21:16:18 +1100373 int r;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000374
Damien Miller95def091999-11-25 00:26:21 +1100375 /* Get IP address of client. */
376 fromlen = sizeof(from);
377 memset(&from, 0, sizeof(from));
Damien Miller34132e52000-01-14 15:45:46 +1100378 if (local) {
379 if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) {
380 error("getsockname failed: %.100s", strerror(errno));
381 return 0;
382 }
383 } else {
Ben Lindstromacaac972002-12-23 02:13:37 +0000384 if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +1100385 debug("getpeername failed: %.100s", strerror(errno));
Damien Miller677257f2005-06-17 12:55:03 +1000386 return -1;
Damien Miller34132e52000-01-14 15:45:46 +1100387 }
Damien Miller95def091999-11-25 00:26:21 +1100388 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100389
390 /* Work around Linux IPv6 weirdness */
391 if (from.ss_family == AF_INET6)
392 fromlen = sizeof(struct sockaddr_in6);
393
Damien Miller95def091999-11-25 00:26:21 +1100394 /* Return port number. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100395 if ((r = getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0,
396 strport, sizeof(strport), NI_NUMERICSERV)) != 0)
397 fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed: %s",
Darren Tucker4abde772007-12-29 02:43:51 +1100398 ssh_gai_strerror(r));
Damien Miller34132e52000-01-14 15:45:46 +1100399 return atoi(strport);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000400}
401
Damien Miller34132e52000-01-14 15:45:46 +1100402/* Returns remote/local port number for the current connection. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000403
Ben Lindstrombba81212001-06-25 05:01:22 +0000404static int
Damien Miller34132e52000-01-14 15:45:46 +1100405get_port(int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000406{
Damien Miller5428f641999-11-25 11:54:57 +1100407 /*
408 * If the connection is not a socket, return 65535. This is
409 * intentionally chosen to be an unprivileged port number.
410 */
Damien Miller34132e52000-01-14 15:45:46 +1100411 if (!packet_connection_is_on_socket())
Damien Miller95def091999-11-25 00:26:21 +1100412 return 65535;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000413
Damien Miller34132e52000-01-14 15:45:46 +1100414 /* Get socket and return the port number. */
415 return get_sock_port(packet_get_connection_in(), local);
416}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000417
Damien Miller4af51302000-04-16 11:18:38 +1000418int
Damien Miller34132e52000-01-14 15:45:46 +1100419get_peer_port(int sock)
420{
421 return get_sock_port(sock, 0);
422}
423
Damien Miller4af51302000-04-16 11:18:38 +1000424int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000425get_remote_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100426{
Damien Miller0670c732004-07-21 21:53:34 +1000427 /* Cache to avoid getpeername() on a dead connection */
Darren Tucker39c76322009-06-21 18:13:57 +1000428 if (cached_port == -1)
429 cached_port = get_port(0);
Damien Miller0670c732004-07-21 21:53:34 +1000430
Darren Tucker39c76322009-06-21 18:13:57 +1000431 return cached_port;
Damien Miller34132e52000-01-14 15:45:46 +1100432}
433
434int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000435get_local_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100436{
437 return get_port(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000438}