blob: 94d666432f0e24403fe30a00926cb3918009d0b0 [file] [log] [blame]
Damien Millerd4a8b7e1999-10-27 13:42:43 +10001/*
Damien Miller95def091999-11-25 00:26:21 +11002 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11003 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11005 * Functions for returning the canonical host name of the remote site.
Damien Miller4af51302000-04-16 11:18:38 +10006 *
Damien Millere4340be2000-09-16 13:29:08 +11007 * 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 Miller95def091999-11-25 00:26:21 +110012 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100013
14#include "includes.h"
Damien Miller9b8073e2005-03-01 21:16:18 +110015RCSID("$OpenBSD: canohost.c,v 1.42 2005/02/18 03:05:53 djm Exp $");
Damien Millerd4a8b7e1999-10-27 13:42:43 +100016
17#include "packet.h"
18#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000019#include "log.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000020#include "canohost.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100021
Ben Lindstrombba81212001-06-25 05:01:22 +000022static void check_ip_options(int, char *);
Damien Miller33804262001-02-04 23:20:18 +110023
Damien Miller5428f641999-11-25 11:54:57 +110024/*
25 * Return the canonical name of the host at the other end of the socket. The
26 * caller should free the returned string with xfree.
27 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100028
Ben Lindstrombba81212001-06-25 05:01:22 +000029static char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +100030get_remote_hostname(int sock, int use_dns)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100031{
Damien Miller34132e52000-01-14 15:45:46 +110032 struct sockaddr_storage from;
33 int i;
34 socklen_t fromlen;
35 struct addrinfo hints, *ai, *aitop;
Damien Miller33804262001-02-04 23:20:18 +110036 char name[NI_MAXHOST], ntop[NI_MAXHOST], ntop2[NI_MAXHOST];
Damien Millerd4a8b7e1999-10-27 13:42:43 +100037
Damien Miller95def091999-11-25 00:26:21 +110038 /* Get IP address of client. */
39 fromlen = sizeof(from);
40 memset(&from, 0, sizeof(from));
Darren Tucker3f9fdc72004-06-22 12:56:01 +100041 if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) {
Damien Miller95def091999-11-25 00:26:21 +110042 debug("getpeername failed: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +100043 cleanup_exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100044 }
Damien Miller7bcb0892000-03-11 20:45:40 +110045
Damien Millerccea0202004-03-31 15:17:54 +100046 if (from.ss_family == AF_INET)
Darren Tucker3f9fdc72004-06-22 12:56:01 +100047 check_ip_options(sock, ntop);
Damien Millerccea0202004-03-31 15:17:54 +100048
Damien Miller927f5272003-11-24 12:57:25 +110049 ipv64_normalise_mapped(&from, &fromlen);
Damien Miller7bcb0892000-03-11 20:45:40 +110050
Damien Miller5e4471e2003-01-07 10:51:23 +110051 if (from.ss_family == AF_INET6)
52 fromlen = sizeof(struct sockaddr_in6);
Damien Miller7bcb0892000-03-11 20:45:40 +110053
Damien Miller34132e52000-01-14 15:45:46 +110054 if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop),
Damien Miller9f0f5c62001-12-21 14:45:46 +110055 NULL, 0, NI_NUMERICHOST) != 0)
Damien Miller34132e52000-01-14 15:45:46 +110056 fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed");
Damien Miller95def091999-11-25 00:26:21 +110057
Damien Miller3a961dc2003-06-03 10:25:48 +100058 if (!use_dns)
59 return xstrdup(ntop);
60
Ben Lindstrom121c7852001-04-18 15:32:44 +000061 debug3("Trying to reverse map address %.100s.", ntop);
Damien Miller34132e52000-01-14 15:45:46 +110062 /* Map the IP address to a host name. */
63 if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name),
Damien Miller9f0f5c62001-12-21 14:45:46 +110064 NULL, 0, NI_NAMEREQD) != 0) {
Damien Miller33804262001-02-04 23:20:18 +110065 /* Host name not found. Use ip address. */
Damien Miller33804262001-02-04 23:20:18 +110066 return xstrdup(ntop);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100067 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +100068
Damien Miller3a961dc2003-06-03 10:25:48 +100069 /*
70 * if reverse lookup result looks like a numeric hostname,
71 * someone is trying to trick us by PTR record like following:
72 * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5
73 */
74 memset(&hints, 0, sizeof(hints));
75 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
Darren Tucker0f684862003-06-05 09:52:42 +100076 hints.ai_flags = AI_NUMERICHOST;
Damien Miller3a961dc2003-06-03 10:25:48 +100077 if (getaddrinfo(name, "0", &hints, &ai) == 0) {
78 logit("Nasty PTR record \"%s\" is set up for %s, ignoring",
79 name, ntop);
80 freeaddrinfo(ai);
81 return xstrdup(ntop);
82 }
83
Damien Miller5428f641999-11-25 11:54:57 +110084 /*
Damien Miller33804262001-02-04 23:20:18 +110085 * Convert it to all lowercase (which is expected by the rest
86 * of this software).
Damien Miller5428f641999-11-25 11:54:57 +110087 */
Damien Miller33804262001-02-04 23:20:18 +110088 for (i = 0; name[i]; i++)
89 if (isupper(name[i]))
90 name[i] = tolower(name[i]);
Damien Miller33804262001-02-04 23:20:18 +110091 /*
92 * Map it back to an IP address and check that the given
93 * address actually is an address of this host. This is
94 * necessary because anyone with access to a name server can
95 * define arbitrary names for an IP address. Mapping from
96 * name to IP address can be trusted better (but can still be
97 * fooled if the intruder has access to the name server of
98 * the domain).
99 */
100 memset(&hints, 0, sizeof(hints));
101 hints.ai_family = from.ss_family;
102 hints.ai_socktype = SOCK_STREAM;
103 if (getaddrinfo(name, NULL, &hints, &aitop) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +1000104 logit("reverse mapping checking getaddrinfo for %.700s "
Damien Miller33804262001-02-04 23:20:18 +1100105 "failed - POSSIBLE BREAKIN ATTEMPT!", name);
106 return xstrdup(ntop);
Damien Miller95def091999-11-25 00:26:21 +1100107 }
Damien Miller33804262001-02-04 23:20:18 +1100108 /* Look for the address from the list of addresses. */
109 for (ai = aitop; ai; ai = ai->ai_next) {
110 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2,
111 sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 &&
112 (strcmp(ntop, ntop2) == 0))
113 break;
114 }
115 freeaddrinfo(aitop);
116 /* If we reached the end of the list, the address was not there. */
117 if (!ai) {
118 /* Address not found for the host name. */
Damien Miller996acd22003-04-09 20:59:48 +1000119 logit("Address %.100s maps to %.600s, but this does not "
Damien Miller33804262001-02-04 23:20:18 +1100120 "map back to the address - POSSIBLE BREAKIN ATTEMPT!",
121 ntop, name);
122 return xstrdup(ntop);
123 }
Damien Miller95def091999-11-25 00:26:21 +1100124 return xstrdup(name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000125}
126
Damien Miller5428f641999-11-25 11:54:57 +1100127/*
Damien Miller33804262001-02-04 23:20:18 +1100128 * If IP options are supported, make sure there are none (log and
129 * disconnect them if any are found). Basically we are worried about
130 * source routing; it can be used to pretend you are somebody
131 * (ip-address) you are not. That itself may be "almost acceptable"
132 * under certain circumstances, but rhosts autentication is useless
133 * if source routing is accepted. Notice also that if we just dropped
134 * source routing here, the other side could use IP spoofing to do
135 * rest of the interaction and could still bypass security. So we
136 * exit here if we detect any IP options.
137 */
138/* IPv4 only */
Ben Lindstrombba81212001-06-25 05:01:22 +0000139static void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000140check_ip_options(int sock, char *ipaddr)
Damien Miller33804262001-02-04 23:20:18 +1100141{
Darren Tucker89f4cf02003-08-07 13:29:04 +1000142#ifdef IP_OPTIONS
Ben Lindstrom075390a2001-02-10 21:34:46 +0000143 u_char options[200];
144 char text[sizeof(options) * 3 + 1];
Damien Miller33804262001-02-04 23:20:18 +1100145 socklen_t option_size;
Ben Lindstrom075390a2001-02-10 21:34:46 +0000146 int i, ipproto;
Damien Miller33804262001-02-04 23:20:18 +1100147 struct protoent *ip;
148
149 if ((ip = getprotobyname("ip")) != NULL)
150 ipproto = ip->p_proto;
151 else
152 ipproto = IPPROTO_IP;
153 option_size = sizeof(options);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000154 if (getsockopt(sock, ipproto, IP_OPTIONS, options,
Damien Miller33804262001-02-04 23:20:18 +1100155 &option_size) >= 0 && option_size != 0) {
Ben Lindstrom075390a2001-02-10 21:34:46 +0000156 text[0] = '\0';
157 for (i = 0; i < option_size; i++)
158 snprintf(text + i*3, sizeof(text) - i*3,
159 " %2.2x", options[i]);
Damien Miller996acd22003-04-09 20:59:48 +1000160 logit("Connection from %.100s with IP options:%.800s",
Damien Miller33804262001-02-04 23:20:18 +1100161 ipaddr, text);
162 packet_disconnect("Connection from %.100s with IP options:%.800s",
163 ipaddr, text);
164 }
Darren Tucker89f4cf02003-08-07 13:29:04 +1000165#endif /* IP_OPTIONS */
Damien Miller33804262001-02-04 23:20:18 +1100166}
167
Darren Tucker2fba9932005-02-02 23:30:24 +1100168void
Damien Miller927f5272003-11-24 12:57:25 +1100169ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len)
170{
171 struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)addr;
172 struct sockaddr_in *a4 = (struct sockaddr_in *)addr;
173 struct in_addr inaddr;
174 u_int16_t port;
175
176 if (addr->ss_family != AF_INET6 ||
177 !IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr))
178 return;
179
180 debug3("Normalising mapped IPv4 in IPv6 address");
181
182 memcpy(&inaddr, ((char *)&a6->sin6_addr) + 12, sizeof(inaddr));
183 port = a6->sin6_port;
184
185 memset(addr, 0, sizeof(*a4));
186
187 a4->sin_family = AF_INET;
188 *len = sizeof(*a4);
189 memcpy(&a4->sin_addr, &inaddr, sizeof(inaddr));
190 a4->sin_port = port;
191}
192
Damien Miller33804262001-02-04 23:20:18 +1100193/*
Damien Miller5428f641999-11-25 11:54:57 +1100194 * Return the canonical name of the host in the other side of the current
195 * connection. The host name is cached, so it is efficient to call this
196 * several times.
197 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000198
Damien Miller95def091999-11-25 00:26:21 +1100199const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000200get_canonical_hostname(int use_dns)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000201{
Damien Miller34132e52000-01-14 15:45:46 +1100202 static char *canonical_host_name = NULL;
Damien Miller3a961dc2003-06-03 10:25:48 +1000203 static int use_dns_done = 0;
Damien Miller34132e52000-01-14 15:45:46 +1100204
Damien Miller33804262001-02-04 23:20:18 +1100205 /* Check if we have previously retrieved name with same option. */
206 if (canonical_host_name != NULL) {
Damien Miller3a961dc2003-06-03 10:25:48 +1000207 if (use_dns_done != use_dns)
Damien Miller33804262001-02-04 23:20:18 +1100208 xfree(canonical_host_name);
209 else
210 return canonical_host_name;
211 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000212
Damien Miller95def091999-11-25 00:26:21 +1100213 /* Get the real hostname if socket; otherwise return UNKNOWN. */
Damien Miller34132e52000-01-14 15:45:46 +1100214 if (packet_connection_is_on_socket())
Damien Miller33804262001-02-04 23:20:18 +1100215 canonical_host_name = get_remote_hostname(
Damien Miller3a961dc2003-06-03 10:25:48 +1000216 packet_get_connection_in(), use_dns);
Damien Miller95def091999-11-25 00:26:21 +1100217 else
218 canonical_host_name = xstrdup("UNKNOWN");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000219
Damien Miller3a961dc2003-06-03 10:25:48 +1000220 use_dns_done = use_dns;
Damien Miller95def091999-11-25 00:26:21 +1100221 return canonical_host_name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000222}
223
Damien Miller5428f641999-11-25 11:54:57 +1100224/*
Ben Lindstromacaac972002-12-23 02:13:37 +0000225 * Returns the local/remote IP-address/hostname of socket as a string.
226 * The returned string must be freed.
Damien Millerd83ff352001-01-30 09:19:34 +1100227 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000228static char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000229get_socket_address(int sock, int remote, int flags)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000230{
231 struct sockaddr_storage addr;
232 socklen_t addrlen;
233 char ntop[NI_MAXHOST];
Damien Miller9b8073e2005-03-01 21:16:18 +1100234 int r;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000235
236 /* Get IP address of client. */
237 addrlen = sizeof(addr);
238 memset(&addr, 0, sizeof(addr));
239
240 if (remote) {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000241 if (getpeername(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000242 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000243 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000244 } else {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000245 if (getsockname(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000246 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000247 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000248 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100249
250 /* Work around Linux IPv6 weirdness */
251 if (addr.ss_family == AF_INET6)
252 addrlen = sizeof(struct sockaddr_in6);
253
Darren Tucker5b115d42005-05-03 19:05:32 +1000254 ipv64_normalise_mapped(&addr, &addrlen);
255
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000256 /* Get the address in ascii. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100257 if ((r = getnameinfo((struct sockaddr *)&addr, addrlen, ntop,
258 sizeof(ntop), NULL, 0, flags)) != 0) {
259 error("get_socket_address: getnameinfo %d failed: %s", flags,
260 r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r));
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000261 return NULL;
262 }
263 return xstrdup(ntop);
264}
Damien Millerd83ff352001-01-30 09:19:34 +1100265
266char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000267get_peer_ipaddr(int sock)
Damien Millerd83ff352001-01-30 09:19:34 +1100268{
Damien Millerb2f844d2002-09-25 12:19:08 +1000269 char *p;
270
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000271 if ((p = get_socket_address(sock, 1, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000272 return p;
273 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000274}
Damien Millerd83ff352001-01-30 09:19:34 +1100275
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000276char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000277get_local_ipaddr(int sock)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000278{
Damien Millerb2f844d2002-09-25 12:19:08 +1000279 char *p;
280
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000281 if ((p = get_socket_address(sock, 0, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000282 return p;
283 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000284}
285
286char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000287get_local_name(int sock)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000288{
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000289 return get_socket_address(sock, 0, NI_NAMEREQD);
Damien Millerd83ff352001-01-30 09:19:34 +1100290}
291
292/*
Damien Miller5428f641999-11-25 11:54:57 +1100293 * Returns the IP-address of the remote host as a string. The returned
Damien Miller34132e52000-01-14 15:45:46 +1100294 * string must not be freed.
Damien Miller5428f641999-11-25 11:54:57 +1100295 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000296
Damien Miller95def091999-11-25 00:26:21 +1100297const char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000298get_remote_ipaddr(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000299{
Damien Miller34132e52000-01-14 15:45:46 +1100300 static char *canonical_host_ip = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000301
Damien Millerd83ff352001-01-30 09:19:34 +1100302 /* Check whether we have cached the ipaddr. */
303 if (canonical_host_ip == NULL) {
304 if (packet_connection_is_on_socket()) {
305 canonical_host_ip =
306 get_peer_ipaddr(packet_get_connection_in());
307 if (canonical_host_ip == NULL)
Darren Tucker3e33cec2003-10-02 16:12:36 +1000308 cleanup_exit(255);
Damien Millerd83ff352001-01-30 09:19:34 +1100309 } else {
310 /* If not on socket, return UNKNOWN. */
311 canonical_host_ip = xstrdup("UNKNOWN");
312 }
Damien Miller95def091999-11-25 00:26:21 +1100313 }
Damien Miller95def091999-11-25 00:26:21 +1100314 return canonical_host_ip;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000315}
316
Ben Lindstromf15a3862001-04-05 23:32:17 +0000317const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000318get_remote_name_or_ip(u_int utmp_len, int use_dns)
Ben Lindstromf15a3862001-04-05 23:32:17 +0000319{
320 static const char *remote = "";
321 if (utmp_len > 0)
Damien Miller3a961dc2003-06-03 10:25:48 +1000322 remote = get_canonical_hostname(use_dns);
Ben Lindstromf15a3862001-04-05 23:32:17 +0000323 if (utmp_len == 0 || strlen(remote) > utmp_len)
324 remote = get_remote_ipaddr();
325 return remote;
326}
327
Damien Miller34132e52000-01-14 15:45:46 +1100328/* Returns the local/remote port for the socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000329
Ben Lindstrombba81212001-06-25 05:01:22 +0000330static int
Damien Miller34132e52000-01-14 15:45:46 +1100331get_sock_port(int sock, int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000332{
Damien Miller34132e52000-01-14 15:45:46 +1100333 struct sockaddr_storage from;
334 socklen_t fromlen;
335 char strport[NI_MAXSERV];
Damien Miller9b8073e2005-03-01 21:16:18 +1100336 int r;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000337
Damien Miller95def091999-11-25 00:26:21 +1100338 /* Get IP address of client. */
339 fromlen = sizeof(from);
340 memset(&from, 0, sizeof(from));
Damien Miller34132e52000-01-14 15:45:46 +1100341 if (local) {
342 if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) {
343 error("getsockname failed: %.100s", strerror(errno));
344 return 0;
345 }
346 } else {
Ben Lindstromacaac972002-12-23 02:13:37 +0000347 if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +1100348 debug("getpeername failed: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +1000349 cleanup_exit(255);
Damien Miller34132e52000-01-14 15:45:46 +1100350 }
Damien Miller95def091999-11-25 00:26:21 +1100351 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100352
353 /* Work around Linux IPv6 weirdness */
354 if (from.ss_family == AF_INET6)
355 fromlen = sizeof(struct sockaddr_in6);
356
Damien Miller95def091999-11-25 00:26:21 +1100357 /* Return port number. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100358 if ((r = getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0,
359 strport, sizeof(strport), NI_NUMERICSERV)) != 0)
360 fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed: %s",
361 r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r));
Damien Miller34132e52000-01-14 15:45:46 +1100362 return atoi(strport);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000363}
364
Damien Miller34132e52000-01-14 15:45:46 +1100365/* Returns remote/local port number for the current connection. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000366
Ben Lindstrombba81212001-06-25 05:01:22 +0000367static int
Damien Miller34132e52000-01-14 15:45:46 +1100368get_port(int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000369{
Damien Miller5428f641999-11-25 11:54:57 +1100370 /*
371 * If the connection is not a socket, return 65535. This is
372 * intentionally chosen to be an unprivileged port number.
373 */
Damien Miller34132e52000-01-14 15:45:46 +1100374 if (!packet_connection_is_on_socket())
Damien Miller95def091999-11-25 00:26:21 +1100375 return 65535;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000376
Damien Miller34132e52000-01-14 15:45:46 +1100377 /* Get socket and return the port number. */
378 return get_sock_port(packet_get_connection_in(), local);
379}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000380
Damien Miller4af51302000-04-16 11:18:38 +1000381int
Damien Miller34132e52000-01-14 15:45:46 +1100382get_peer_port(int sock)
383{
384 return get_sock_port(sock, 0);
385}
386
Damien Miller4af51302000-04-16 11:18:38 +1000387int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000388get_remote_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100389{
Damien Miller0670c732004-07-21 21:53:34 +1000390 static int port = -1;
391
392 /* Cache to avoid getpeername() on a dead connection */
393 if (port == -1)
394 port = get_port(0);
395
396 return port;
Damien Miller34132e52000-01-14 15:45:46 +1100397}
398
399int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000400get_local_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100401{
402 return get_port(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000403}