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Damien Miller7acefbb2014-07-18 14:11:24 +10001/* $OpenBSD: canohost.c,v 1.71 2014/07/15 15:54:14 millert 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>
Damien Miller7acefbb2014-07-18 14:11:24 +100019#include <sys/un.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100020
21#include <netinet/in.h>
Darren Tuckerdace2332006-09-22 19:22:17 +100022#include <arpa/inet.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100023
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];
Darren Tucker7b1ded02014-01-19 15:30:02 +1100158 socklen_t option_size, i;
Damien Millereccb9de2005-06-17 12:59:34 +1000159 int ipproto;
Damien Miller33804262001-02-04 23:20:18 +1100160 struct protoent *ip;
161
162 if ((ip = getprotobyname("ip")) != NULL)
163 ipproto = ip->p_proto;
164 else
165 ipproto = IPPROTO_IP;
166 option_size = sizeof(options);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000167 if (getsockopt(sock, ipproto, IP_OPTIONS, options,
Damien Miller33804262001-02-04 23:20:18 +1100168 &option_size) >= 0 && option_size != 0) {
Ben Lindstrom075390a2001-02-10 21:34:46 +0000169 text[0] = '\0';
170 for (i = 0; i < option_size; i++)
171 snprintf(text + i*3, sizeof(text) - i*3,
172 " %2.2x", options[i]);
Damien Miller4d3fd542005-11-05 15:13:24 +1100173 fatal("Connection from %.100s with IP options:%.800s",
Damien Miller33804262001-02-04 23:20:18 +1100174 ipaddr, text);
175 }
Darren Tucker89f4cf02003-08-07 13:29:04 +1000176#endif /* IP_OPTIONS */
Damien Miller33804262001-02-04 23:20:18 +1100177}
178
Darren Tucker2fba9932005-02-02 23:30:24 +1100179void
Damien Miller927f5272003-11-24 12:57:25 +1100180ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len)
181{
182 struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)addr;
183 struct sockaddr_in *a4 = (struct sockaddr_in *)addr;
184 struct in_addr inaddr;
185 u_int16_t port;
186
Damien Miller94cf4c82005-07-17 17:04:47 +1000187 if (addr->ss_family != AF_INET6 ||
Damien Miller927f5272003-11-24 12:57:25 +1100188 !IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr))
189 return;
190
191 debug3("Normalising mapped IPv4 in IPv6 address");
192
193 memcpy(&inaddr, ((char *)&a6->sin6_addr) + 12, sizeof(inaddr));
194 port = a6->sin6_port;
195
Damien Miller1d2c4562014-02-04 11:18:20 +1100196 memset(a4, 0, sizeof(*a4));
Damien Miller927f5272003-11-24 12:57:25 +1100197
198 a4->sin_family = AF_INET;
199 *len = sizeof(*a4);
200 memcpy(&a4->sin_addr, &inaddr, sizeof(inaddr));
201 a4->sin_port = port;
202}
203
Damien Miller33804262001-02-04 23:20:18 +1100204/*
Damien Miller5428f641999-11-25 11:54:57 +1100205 * Return the canonical name of the host in the other side of the current
206 * connection. The host name is cached, so it is efficient to call this
207 * several times.
208 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000209
Damien Miller95def091999-11-25 00:26:21 +1100210const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000211get_canonical_hostname(int use_dns)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000212{
Damien Miller24ecf612005-11-05 15:16:52 +1100213 char *host;
Damien Miller34132e52000-01-14 15:45:46 +1100214 static char *canonical_host_name = NULL;
Damien Miller24ecf612005-11-05 15:16:52 +1100215 static char *remote_ip = NULL;
Damien Miller34132e52000-01-14 15:45:46 +1100216
Damien Miller33804262001-02-04 23:20:18 +1100217 /* Check if we have previously retrieved name with same option. */
Damien Miller24ecf612005-11-05 15:16:52 +1100218 if (use_dns && canonical_host_name != NULL)
219 return canonical_host_name;
220 if (!use_dns && remote_ip != NULL)
221 return remote_ip;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000222
Damien Miller95def091999-11-25 00:26:21 +1100223 /* Get the real hostname if socket; otherwise return UNKNOWN. */
Damien Miller34132e52000-01-14 15:45:46 +1100224 if (packet_connection_is_on_socket())
Damien Miller24ecf612005-11-05 15:16:52 +1100225 host = get_remote_hostname(packet_get_connection_in(), use_dns);
Damien Miller95def091999-11-25 00:26:21 +1100226 else
Damien Miller24ecf612005-11-05 15:16:52 +1100227 host = "UNKNOWN";
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000228
Damien Miller24ecf612005-11-05 15:16:52 +1100229 if (use_dns)
230 canonical_host_name = host;
231 else
232 remote_ip = host;
233 return host;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000234}
235
Damien Miller5428f641999-11-25 11:54:57 +1100236/*
Ben Lindstromacaac972002-12-23 02:13:37 +0000237 * Returns the local/remote IP-address/hostname of socket as a string.
238 * The returned string must be freed.
Damien Millerd83ff352001-01-30 09:19:34 +1100239 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000240static char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000241get_socket_address(int sock, int remote, int flags)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000242{
243 struct sockaddr_storage addr;
244 socklen_t addrlen;
245 char ntop[NI_MAXHOST];
Damien Miller9b8073e2005-03-01 21:16:18 +1100246 int r;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000247
248 /* Get IP address of client. */
249 addrlen = sizeof(addr);
250 memset(&addr, 0, sizeof(addr));
251
252 if (remote) {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000253 if (getpeername(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000254 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000255 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000256 } else {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000257 if (getsockname(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000258 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000259 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000260 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100261
262 /* Work around Linux IPv6 weirdness */
263 if (addr.ss_family == AF_INET6)
264 addrlen = sizeof(struct sockaddr_in6);
265
Damien Miller7acefbb2014-07-18 14:11:24 +1000266 if (addr.ss_family == AF_UNIX) {
267 /* Get the Unix domain socket path. */
268 return xstrdup(((struct sockaddr_un *)&addr)->sun_path);
269 }
270
Darren Tucker5b115d42005-05-03 19:05:32 +1000271 ipv64_normalise_mapped(&addr, &addrlen);
272
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000273 /* Get the address in ascii. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100274 if ((r = getnameinfo((struct sockaddr *)&addr, addrlen, ntop,
275 sizeof(ntop), NULL, 0, flags)) != 0) {
276 error("get_socket_address: getnameinfo %d failed: %s", flags,
Darren Tucker4abde772007-12-29 02:43:51 +1100277 ssh_gai_strerror(r));
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000278 return NULL;
279 }
280 return xstrdup(ntop);
281}
Damien Millerd83ff352001-01-30 09:19:34 +1100282
283char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000284get_peer_ipaddr(int sock)
Damien Millerd83ff352001-01-30 09:19:34 +1100285{
Damien Millerb2f844d2002-09-25 12:19:08 +1000286 char *p;
287
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000288 if ((p = get_socket_address(sock, 1, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000289 return p;
290 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000291}
Damien Millerd83ff352001-01-30 09:19:34 +1100292
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000293char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000294get_local_ipaddr(int sock)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000295{
Damien Millerb2f844d2002-09-25 12:19:08 +1000296 char *p;
297
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000298 if ((p = get_socket_address(sock, 0, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000299 return p;
300 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000301}
302
303char *
Darren Tuckerdaaa4502010-01-13 22:43:33 +1100304get_local_name(int fd)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000305{
Darren Tuckerdaaa4502010-01-13 22:43:33 +1100306 char *host, myname[NI_MAXHOST];
307
308 /* Assume we were passed a socket */
309 if ((host = get_socket_address(fd, 0, NI_NAMEREQD)) != NULL)
310 return host;
311
312 /* Handle the case where we were passed a pipe */
313 if (gethostname(myname, sizeof(myname)) == -1) {
314 verbose("get_local_name: gethostname: %s", strerror(errno));
315 } else {
316 host = xstrdup(myname);
317 }
318
319 return host;
Damien Millerd83ff352001-01-30 09:19:34 +1100320}
321
Darren Tucker39c76322009-06-21 18:13:57 +1000322void
323clear_cached_addr(void)
324{
Darren Tuckera627d422013-06-02 07:31:17 +1000325 free(canonical_host_ip);
326 canonical_host_ip = NULL;
Darren Tucker39c76322009-06-21 18:13:57 +1000327 cached_port = -1;
328}
329
Damien Millerd83ff352001-01-30 09:19:34 +1100330/*
Damien Miller5428f641999-11-25 11:54:57 +1100331 * Returns the IP-address of the remote host as a string. The returned
Damien Miller34132e52000-01-14 15:45:46 +1100332 * string must not be freed.
Damien Miller5428f641999-11-25 11:54:57 +1100333 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000334
Damien Miller95def091999-11-25 00:26:21 +1100335const char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000336get_remote_ipaddr(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000337{
Damien Millerd83ff352001-01-30 09:19:34 +1100338 /* Check whether we have cached the ipaddr. */
339 if (canonical_host_ip == NULL) {
340 if (packet_connection_is_on_socket()) {
341 canonical_host_ip =
342 get_peer_ipaddr(packet_get_connection_in());
343 if (canonical_host_ip == NULL)
Darren Tucker3e33cec2003-10-02 16:12:36 +1000344 cleanup_exit(255);
Damien Millerd83ff352001-01-30 09:19:34 +1100345 } else {
346 /* If not on socket, return UNKNOWN. */
347 canonical_host_ip = xstrdup("UNKNOWN");
348 }
Damien Miller95def091999-11-25 00:26:21 +1100349 }
Damien Miller95def091999-11-25 00:26:21 +1100350 return canonical_host_ip;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000351}
352
Ben Lindstromf15a3862001-04-05 23:32:17 +0000353const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000354get_remote_name_or_ip(u_int utmp_len, int use_dns)
Ben Lindstromf15a3862001-04-05 23:32:17 +0000355{
356 static const char *remote = "";
357 if (utmp_len > 0)
Damien Miller3a961dc2003-06-03 10:25:48 +1000358 remote = get_canonical_hostname(use_dns);
Ben Lindstromf15a3862001-04-05 23:32:17 +0000359 if (utmp_len == 0 || strlen(remote) > utmp_len)
360 remote = get_remote_ipaddr();
361 return remote;
362}
363
Damien Miller34132e52000-01-14 15:45:46 +1100364/* Returns the local/remote port for the socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000365
Damien Miller4bf648f2009-02-14 16:28:21 +1100366int
Damien Miller34132e52000-01-14 15:45:46 +1100367get_sock_port(int sock, int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000368{
Damien Miller34132e52000-01-14 15:45:46 +1100369 struct sockaddr_storage from;
370 socklen_t fromlen;
371 char strport[NI_MAXSERV];
Damien Miller9b8073e2005-03-01 21:16:18 +1100372 int r;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000373
Damien Miller95def091999-11-25 00:26:21 +1100374 /* Get IP address of client. */
375 fromlen = sizeof(from);
376 memset(&from, 0, sizeof(from));
Damien Miller34132e52000-01-14 15:45:46 +1100377 if (local) {
378 if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) {
379 error("getsockname failed: %.100s", strerror(errno));
380 return 0;
381 }
382 } else {
Ben Lindstromacaac972002-12-23 02:13:37 +0000383 if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +1100384 debug("getpeername failed: %.100s", strerror(errno));
Damien Miller677257f2005-06-17 12:55:03 +1000385 return -1;
Damien Miller34132e52000-01-14 15:45:46 +1100386 }
Damien Miller95def091999-11-25 00:26:21 +1100387 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100388
389 /* Work around Linux IPv6 weirdness */
390 if (from.ss_family == AF_INET6)
391 fromlen = sizeof(struct sockaddr_in6);
392
Damien Miller7acefbb2014-07-18 14:11:24 +1000393 /* Unix domain sockets don't have a port number. */
394 if (from.ss_family == AF_UNIX)
395 return 0;
396
Damien Miller95def091999-11-25 00:26:21 +1100397 /* Return port number. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100398 if ((r = getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0,
399 strport, sizeof(strport), NI_NUMERICSERV)) != 0)
400 fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed: %s",
Darren Tucker4abde772007-12-29 02:43:51 +1100401 ssh_gai_strerror(r));
Damien Miller34132e52000-01-14 15:45:46 +1100402 return atoi(strport);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000403}
404
Damien Miller34132e52000-01-14 15:45:46 +1100405/* Returns remote/local port number for the current connection. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000406
Ben Lindstrombba81212001-06-25 05:01:22 +0000407static int
Damien Miller34132e52000-01-14 15:45:46 +1100408get_port(int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000409{
Damien Miller5428f641999-11-25 11:54:57 +1100410 /*
411 * If the connection is not a socket, return 65535. This is
412 * intentionally chosen to be an unprivileged port number.
413 */
Damien Miller34132e52000-01-14 15:45:46 +1100414 if (!packet_connection_is_on_socket())
Damien Miller95def091999-11-25 00:26:21 +1100415 return 65535;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000416
Damien Miller34132e52000-01-14 15:45:46 +1100417 /* Get socket and return the port number. */
418 return get_sock_port(packet_get_connection_in(), local);
419}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000420
Damien Miller4af51302000-04-16 11:18:38 +1000421int
Damien Miller34132e52000-01-14 15:45:46 +1100422get_peer_port(int sock)
423{
424 return get_sock_port(sock, 0);
425}
426
Damien Miller4af51302000-04-16 11:18:38 +1000427int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000428get_remote_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100429{
Damien Miller0670c732004-07-21 21:53:34 +1000430 /* Cache to avoid getpeername() on a dead connection */
Darren Tucker39c76322009-06-21 18:13:57 +1000431 if (cached_port == -1)
432 cached_port = get_port(0);
Damien Miller0670c732004-07-21 21:53:34 +1000433
Darren Tucker39c76322009-06-21 18:13:57 +1000434 return cached_port;
Damien Miller34132e52000-01-14 15:45:46 +1100435}
436
437int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000438get_local_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100439{
440 return get_port(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000441}