blob: a8eeb0e35c83791967379b7b0036c6c3e33cce76 [file] [log] [blame]
Damien Millere9fc72e2013-10-15 12:14:12 +11001/* $OpenBSD: canohost.c,v 1.68 2013/10/14 23:28:22 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;
Damien Miller34132e52000-01-14 15:45:46 +110051 socklen_t fromlen;
52 struct addrinfo hints, *ai, *aitop;
Damien Miller33804262001-02-04 23:20:18 +110053 char name[NI_MAXHOST], ntop[NI_MAXHOST], ntop2[NI_MAXHOST];
Damien Millerd4a8b7e1999-10-27 13:42:43 +100054
Damien Miller95def091999-11-25 00:26:21 +110055 /* Get IP address of client. */
56 fromlen = sizeof(from);
57 memset(&from, 0, sizeof(from));
Darren Tucker3f9fdc72004-06-22 12:56:01 +100058 if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) {
Damien Miller95def091999-11-25 00:26:21 +110059 debug("getpeername failed: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +100060 cleanup_exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100061 }
Damien Miller7bcb0892000-03-11 20:45:40 +110062
Damien Miller2eaf37d2006-04-18 15:13:16 +100063 if (from.ss_family == AF_INET)
64 check_ip_options(sock, ntop);
65
Damien Miller927f5272003-11-24 12:57:25 +110066 ipv64_normalise_mapped(&from, &fromlen);
Damien Miller7bcb0892000-03-11 20:45:40 +110067
Damien Miller5e4471e2003-01-07 10:51:23 +110068 if (from.ss_family == AF_INET6)
69 fromlen = sizeof(struct sockaddr_in6);
Damien Miller7bcb0892000-03-11 20:45:40 +110070
Damien Miller34132e52000-01-14 15:45:46 +110071 if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop),
Damien Miller9f0f5c62001-12-21 14:45:46 +110072 NULL, 0, NI_NUMERICHOST) != 0)
Damien Miller34132e52000-01-14 15:45:46 +110073 fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed");
Damien Miller95def091999-11-25 00:26:21 +110074
Damien Miller3a961dc2003-06-03 10:25:48 +100075 if (!use_dns)
76 return xstrdup(ntop);
77
Ben Lindstrom121c7852001-04-18 15:32:44 +000078 debug3("Trying to reverse map address %.100s.", ntop);
Damien Miller34132e52000-01-14 15:45:46 +110079 /* Map the IP address to a host name. */
80 if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name),
Damien Miller9f0f5c62001-12-21 14:45:46 +110081 NULL, 0, NI_NAMEREQD) != 0) {
Damien Miller33804262001-02-04 23:20:18 +110082 /* Host name not found. Use ip address. */
Damien Miller33804262001-02-04 23:20:18 +110083 return xstrdup(ntop);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100084 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +100085
Damien Miller3a961dc2003-06-03 10:25:48 +100086 /*
87 * if reverse lookup result looks like a numeric hostname,
88 * someone is trying to trick us by PTR record like following:
89 * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5
90 */
91 memset(&hints, 0, sizeof(hints));
92 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
Darren Tucker0f684862003-06-05 09:52:42 +100093 hints.ai_flags = AI_NUMERICHOST;
Darren Tucker30ac73b2008-06-13 04:46:45 +100094 if (getaddrinfo(name, NULL, &hints, &ai) == 0) {
Damien Miller3a961dc2003-06-03 10:25:48 +100095 logit("Nasty PTR record \"%s\" is set up for %s, ignoring",
96 name, ntop);
97 freeaddrinfo(ai);
98 return xstrdup(ntop);
99 }
100
Damien Millere9fc72e2013-10-15 12:14:12 +1100101 /* Names are stores in lowercase. */
102 lowercase(name);
103
Damien Miller33804262001-02-04 23:20:18 +1100104 /*
105 * Map it back to an IP address and check that the given
106 * address actually is an address of this host. This is
107 * necessary because anyone with access to a name server can
108 * define arbitrary names for an IP address. Mapping from
109 * name to IP address can be trusted better (but can still be
110 * fooled if the intruder has access to the name server of
111 * the domain).
112 */
113 memset(&hints, 0, sizeof(hints));
114 hints.ai_family = from.ss_family;
115 hints.ai_socktype = SOCK_STREAM;
116 if (getaddrinfo(name, NULL, &hints, &aitop) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +1000117 logit("reverse mapping checking getaddrinfo for %.700s "
Damien Millerde85a282006-03-15 12:06:41 +1100118 "[%s] failed - POSSIBLE BREAK-IN ATTEMPT!", name, ntop);
Damien Miller33804262001-02-04 23:20:18 +1100119 return xstrdup(ntop);
Damien Miller95def091999-11-25 00:26:21 +1100120 }
Damien Miller33804262001-02-04 23:20:18 +1100121 /* Look for the address from the list of addresses. */
122 for (ai = aitop; ai; ai = ai->ai_next) {
123 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2,
124 sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 &&
125 (strcmp(ntop, ntop2) == 0))
126 break;
127 }
128 freeaddrinfo(aitop);
129 /* If we reached the end of the list, the address was not there. */
130 if (!ai) {
131 /* Address not found for the host name. */
Damien Miller996acd22003-04-09 20:59:48 +1000132 logit("Address %.100s maps to %.600s, but this does not "
Damien Miller5eb137c2005-12-31 16:19:53 +1100133 "map back to the address - POSSIBLE BREAK-IN ATTEMPT!",
Damien Miller33804262001-02-04 23:20:18 +1100134 ntop, name);
135 return xstrdup(ntop);
136 }
Damien Miller95def091999-11-25 00:26:21 +1100137 return xstrdup(name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000138}
139
Damien Miller5428f641999-11-25 11:54:57 +1100140/*
Damien Miller33804262001-02-04 23:20:18 +1100141 * If IP options are supported, make sure there are none (log and
142 * disconnect them if any are found). Basically we are worried about
143 * source routing; it can be used to pretend you are somebody
144 * (ip-address) you are not. That itself may be "almost acceptable"
145 * under certain circumstances, but rhosts autentication is useless
146 * if source routing is accepted. Notice also that if we just dropped
147 * source routing here, the other side could use IP spoofing to do
148 * rest of the interaction and could still bypass security. So we
149 * exit here if we detect any IP options.
150 */
151/* IPv4 only */
Ben Lindstrombba81212001-06-25 05:01:22 +0000152static void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000153check_ip_options(int sock, char *ipaddr)
Damien Miller33804262001-02-04 23:20:18 +1100154{
Darren Tucker89f4cf02003-08-07 13:29:04 +1000155#ifdef IP_OPTIONS
Ben Lindstrom075390a2001-02-10 21:34:46 +0000156 u_char options[200];
157 char text[sizeof(options) * 3 + 1];
Damien Miller33804262001-02-04 23:20:18 +1100158 socklen_t option_size;
Damien Millereccb9de2005-06-17 12:59:34 +1000159 u_int i;
160 int ipproto;
Damien Miller33804262001-02-04 23:20:18 +1100161 struct protoent *ip;
162
163 if ((ip = getprotobyname("ip")) != NULL)
164 ipproto = ip->p_proto;
165 else
166 ipproto = IPPROTO_IP;
167 option_size = sizeof(options);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000168 if (getsockopt(sock, ipproto, IP_OPTIONS, options,
Damien Miller33804262001-02-04 23:20:18 +1100169 &option_size) >= 0 && option_size != 0) {
Ben Lindstrom075390a2001-02-10 21:34:46 +0000170 text[0] = '\0';
171 for (i = 0; i < option_size; i++)
172 snprintf(text + i*3, sizeof(text) - i*3,
173 " %2.2x", options[i]);
Damien Miller4d3fd542005-11-05 15:13:24 +1100174 fatal("Connection from %.100s with IP options:%.800s",
Damien Miller33804262001-02-04 23:20:18 +1100175 ipaddr, text);
176 }
Darren Tucker89f4cf02003-08-07 13:29:04 +1000177#endif /* IP_OPTIONS */
Damien Miller33804262001-02-04 23:20:18 +1100178}
179
Darren Tucker2fba9932005-02-02 23:30:24 +1100180void
Damien Miller927f5272003-11-24 12:57:25 +1100181ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len)
182{
183 struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)addr;
184 struct sockaddr_in *a4 = (struct sockaddr_in *)addr;
185 struct in_addr inaddr;
186 u_int16_t port;
187
Damien Miller94cf4c82005-07-17 17:04:47 +1000188 if (addr->ss_family != AF_INET6 ||
Damien Miller927f5272003-11-24 12:57:25 +1100189 !IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr))
190 return;
191
192 debug3("Normalising mapped IPv4 in IPv6 address");
193
194 memcpy(&inaddr, ((char *)&a6->sin6_addr) + 12, sizeof(inaddr));
195 port = a6->sin6_port;
196
Damien Miller47e57bf2010-10-12 13:28:12 +1100197 bzero(a4, sizeof(*a4));
Damien Miller927f5272003-11-24 12:57:25 +1100198
199 a4->sin_family = AF_INET;
200 *len = sizeof(*a4);
201 memcpy(&a4->sin_addr, &inaddr, sizeof(inaddr));
202 a4->sin_port = port;
203}
204
Damien Miller33804262001-02-04 23:20:18 +1100205/*
Damien Miller5428f641999-11-25 11:54:57 +1100206 * Return the canonical name of the host in the other side of the current
207 * connection. The host name is cached, so it is efficient to call this
208 * several times.
209 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000210
Damien Miller95def091999-11-25 00:26:21 +1100211const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000212get_canonical_hostname(int use_dns)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000213{
Damien Miller24ecf612005-11-05 15:16:52 +1100214 char *host;
Damien Miller34132e52000-01-14 15:45:46 +1100215 static char *canonical_host_name = NULL;
Damien Miller24ecf612005-11-05 15:16:52 +1100216 static char *remote_ip = NULL;
Damien Miller34132e52000-01-14 15:45:46 +1100217
Damien Miller33804262001-02-04 23:20:18 +1100218 /* Check if we have previously retrieved name with same option. */
Damien Miller24ecf612005-11-05 15:16:52 +1100219 if (use_dns && canonical_host_name != NULL)
220 return canonical_host_name;
221 if (!use_dns && remote_ip != NULL)
222 return remote_ip;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000223
Damien Miller95def091999-11-25 00:26:21 +1100224 /* Get the real hostname if socket; otherwise return UNKNOWN. */
Damien Miller34132e52000-01-14 15:45:46 +1100225 if (packet_connection_is_on_socket())
Damien Miller24ecf612005-11-05 15:16:52 +1100226 host = get_remote_hostname(packet_get_connection_in(), use_dns);
Damien Miller95def091999-11-25 00:26:21 +1100227 else
Damien Miller24ecf612005-11-05 15:16:52 +1100228 host = "UNKNOWN";
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000229
Damien Miller24ecf612005-11-05 15:16:52 +1100230 if (use_dns)
231 canonical_host_name = host;
232 else
233 remote_ip = host;
234 return host;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000235}
236
Damien Miller5428f641999-11-25 11:54:57 +1100237/*
Ben Lindstromacaac972002-12-23 02:13:37 +0000238 * Returns the local/remote IP-address/hostname of socket as a string.
239 * The returned string must be freed.
Damien Millerd83ff352001-01-30 09:19:34 +1100240 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000241static char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000242get_socket_address(int sock, int remote, int flags)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000243{
244 struct sockaddr_storage addr;
245 socklen_t addrlen;
246 char ntop[NI_MAXHOST];
Damien Miller9b8073e2005-03-01 21:16:18 +1100247 int r;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000248
249 /* Get IP address of client. */
250 addrlen = sizeof(addr);
251 memset(&addr, 0, sizeof(addr));
252
253 if (remote) {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000254 if (getpeername(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000255 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000256 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000257 } else {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000258 if (getsockname(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000259 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000260 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000261 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100262
263 /* Work around Linux IPv6 weirdness */
264 if (addr.ss_family == AF_INET6)
265 addrlen = sizeof(struct sockaddr_in6);
266
Darren Tucker5b115d42005-05-03 19:05:32 +1000267 ipv64_normalise_mapped(&addr, &addrlen);
268
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000269 /* Get the address in ascii. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100270 if ((r = getnameinfo((struct sockaddr *)&addr, addrlen, ntop,
271 sizeof(ntop), NULL, 0, flags)) != 0) {
272 error("get_socket_address: getnameinfo %d failed: %s", flags,
Darren Tucker4abde772007-12-29 02:43:51 +1100273 ssh_gai_strerror(r));
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000274 return NULL;
275 }
276 return xstrdup(ntop);
277}
Damien Millerd83ff352001-01-30 09:19:34 +1100278
279char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000280get_peer_ipaddr(int sock)
Damien Millerd83ff352001-01-30 09:19:34 +1100281{
Damien Millerb2f844d2002-09-25 12:19:08 +1000282 char *p;
283
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000284 if ((p = get_socket_address(sock, 1, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000285 return p;
286 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000287}
Damien Millerd83ff352001-01-30 09:19:34 +1100288
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000289char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000290get_local_ipaddr(int sock)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000291{
Damien Millerb2f844d2002-09-25 12:19:08 +1000292 char *p;
293
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000294 if ((p = get_socket_address(sock, 0, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000295 return p;
296 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000297}
298
299char *
Darren Tuckerdaaa4502010-01-13 22:43:33 +1100300get_local_name(int fd)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000301{
Darren Tuckerdaaa4502010-01-13 22:43:33 +1100302 char *host, myname[NI_MAXHOST];
303
304 /* Assume we were passed a socket */
305 if ((host = get_socket_address(fd, 0, NI_NAMEREQD)) != NULL)
306 return host;
307
308 /* Handle the case where we were passed a pipe */
309 if (gethostname(myname, sizeof(myname)) == -1) {
310 verbose("get_local_name: gethostname: %s", strerror(errno));
311 } else {
312 host = xstrdup(myname);
313 }
314
315 return host;
Damien Millerd83ff352001-01-30 09:19:34 +1100316}
317
Darren Tucker39c76322009-06-21 18:13:57 +1000318void
319clear_cached_addr(void)
320{
Darren Tuckera627d422013-06-02 07:31:17 +1000321 free(canonical_host_ip);
322 canonical_host_ip = NULL;
Darren Tucker39c76322009-06-21 18:13:57 +1000323 cached_port = -1;
324}
325
Damien Millerd83ff352001-01-30 09:19:34 +1100326/*
Damien Miller5428f641999-11-25 11:54:57 +1100327 * Returns the IP-address of the remote host as a string. The returned
Damien Miller34132e52000-01-14 15:45:46 +1100328 * string must not be freed.
Damien Miller5428f641999-11-25 11:54:57 +1100329 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000330
Damien Miller95def091999-11-25 00:26:21 +1100331const char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000332get_remote_ipaddr(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000333{
Damien Millerd83ff352001-01-30 09:19:34 +1100334 /* Check whether we have cached the ipaddr. */
335 if (canonical_host_ip == NULL) {
336 if (packet_connection_is_on_socket()) {
337 canonical_host_ip =
338 get_peer_ipaddr(packet_get_connection_in());
339 if (canonical_host_ip == NULL)
Darren Tucker3e33cec2003-10-02 16:12:36 +1000340 cleanup_exit(255);
Damien Millerd83ff352001-01-30 09:19:34 +1100341 } else {
342 /* If not on socket, return UNKNOWN. */
343 canonical_host_ip = xstrdup("UNKNOWN");
344 }
Damien Miller95def091999-11-25 00:26:21 +1100345 }
Damien Miller95def091999-11-25 00:26:21 +1100346 return canonical_host_ip;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000347}
348
Ben Lindstromf15a3862001-04-05 23:32:17 +0000349const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000350get_remote_name_or_ip(u_int utmp_len, int use_dns)
Ben Lindstromf15a3862001-04-05 23:32:17 +0000351{
352 static const char *remote = "";
353 if (utmp_len > 0)
Damien Miller3a961dc2003-06-03 10:25:48 +1000354 remote = get_canonical_hostname(use_dns);
Ben Lindstromf15a3862001-04-05 23:32:17 +0000355 if (utmp_len == 0 || strlen(remote) > utmp_len)
356 remote = get_remote_ipaddr();
357 return remote;
358}
359
Damien Miller34132e52000-01-14 15:45:46 +1100360/* Returns the local/remote port for the socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000361
Damien Miller4bf648f2009-02-14 16:28:21 +1100362int
Damien Miller34132e52000-01-14 15:45:46 +1100363get_sock_port(int sock, int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000364{
Damien Miller34132e52000-01-14 15:45:46 +1100365 struct sockaddr_storage from;
366 socklen_t fromlen;
367 char strport[NI_MAXSERV];
Damien Miller9b8073e2005-03-01 21:16:18 +1100368 int r;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000369
Damien Miller95def091999-11-25 00:26:21 +1100370 /* Get IP address of client. */
371 fromlen = sizeof(from);
372 memset(&from, 0, sizeof(from));
Damien Miller34132e52000-01-14 15:45:46 +1100373 if (local) {
374 if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) {
375 error("getsockname failed: %.100s", strerror(errno));
376 return 0;
377 }
378 } else {
Ben Lindstromacaac972002-12-23 02:13:37 +0000379 if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +1100380 debug("getpeername failed: %.100s", strerror(errno));
Damien Miller677257f2005-06-17 12:55:03 +1000381 return -1;
Damien Miller34132e52000-01-14 15:45:46 +1100382 }
Damien Miller95def091999-11-25 00:26:21 +1100383 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100384
385 /* Work around Linux IPv6 weirdness */
386 if (from.ss_family == AF_INET6)
387 fromlen = sizeof(struct sockaddr_in6);
388
Damien Miller95def091999-11-25 00:26:21 +1100389 /* Return port number. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100390 if ((r = getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0,
391 strport, sizeof(strport), NI_NUMERICSERV)) != 0)
392 fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed: %s",
Darren Tucker4abde772007-12-29 02:43:51 +1100393 ssh_gai_strerror(r));
Damien Miller34132e52000-01-14 15:45:46 +1100394 return atoi(strport);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000395}
396
Damien Miller34132e52000-01-14 15:45:46 +1100397/* Returns remote/local port number for the current connection. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000398
Ben Lindstrombba81212001-06-25 05:01:22 +0000399static int
Damien Miller34132e52000-01-14 15:45:46 +1100400get_port(int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000401{
Damien Miller5428f641999-11-25 11:54:57 +1100402 /*
403 * If the connection is not a socket, return 65535. This is
404 * intentionally chosen to be an unprivileged port number.
405 */
Damien Miller34132e52000-01-14 15:45:46 +1100406 if (!packet_connection_is_on_socket())
Damien Miller95def091999-11-25 00:26:21 +1100407 return 65535;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000408
Damien Miller34132e52000-01-14 15:45:46 +1100409 /* Get socket and return the port number. */
410 return get_sock_port(packet_get_connection_in(), local);
411}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000412
Damien Miller4af51302000-04-16 11:18:38 +1000413int
Damien Miller34132e52000-01-14 15:45:46 +1100414get_peer_port(int sock)
415{
416 return get_sock_port(sock, 0);
417}
418
Damien Miller4af51302000-04-16 11:18:38 +1000419int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000420get_remote_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100421{
Damien Miller0670c732004-07-21 21:53:34 +1000422 /* Cache to avoid getpeername() on a dead connection */
Darren Tucker39c76322009-06-21 18:13:57 +1000423 if (cached_port == -1)
424 cached_port = get_port(0);
Damien Miller0670c732004-07-21 21:53:34 +1000425
Darren Tucker39c76322009-06-21 18:13:57 +1000426 return cached_port;
Damien Miller34132e52000-01-14 15:45:46 +1100427}
428
429int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000430get_local_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100431{
432 return get_port(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000433}