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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"
Darren Tuckerb0b12292005-10-03 18:23:44 +100015RCSID("$OpenBSD: canohost.c,v 1.45 2005/10/03 07:44:42 dtucker 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 Miller927f5272003-11-24 12:57:25 +110046 ipv64_normalise_mapped(&from, &fromlen);
Damien Miller7bcb0892000-03-11 20:45:40 +110047
Damien Miller5e4471e2003-01-07 10:51:23 +110048 if (from.ss_family == AF_INET6)
49 fromlen = sizeof(struct sockaddr_in6);
Damien Miller7bcb0892000-03-11 20:45:40 +110050
Damien Miller34132e52000-01-14 15:45:46 +110051 if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop),
Damien Miller9f0f5c62001-12-21 14:45:46 +110052 NULL, 0, NI_NUMERICHOST) != 0)
Damien Miller34132e52000-01-14 15:45:46 +110053 fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed");
Damien Miller95def091999-11-25 00:26:21 +110054
Darren Tuckerb0b12292005-10-03 18:23:44 +100055 if (from.ss_family == AF_INET)
56 check_ip_options(sock, ntop);
57
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;
Damien Millereccb9de2005-06-17 12:59:34 +1000146 u_int i;
147 int ipproto;
Damien Miller33804262001-02-04 23:20:18 +1100148 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);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000155 if (getsockopt(sock, ipproto, IP_OPTIONS, options,
Damien Miller33804262001-02-04 23:20:18 +1100156 &option_size) >= 0 && option_size != 0) {
Ben Lindstrom075390a2001-02-10 21:34:46 +0000157 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 Miller996acd22003-04-09 20:59:48 +1000161 logit("Connection from %.100s with IP options:%.800s",
Damien Miller33804262001-02-04 23:20:18 +1100162 ipaddr, text);
163 packet_disconnect("Connection from %.100s with IP options:%.800s",
164 ipaddr, text);
165 }
Darren Tucker89f4cf02003-08-07 13:29:04 +1000166#endif /* IP_OPTIONS */
Damien Miller33804262001-02-04 23:20:18 +1100167}
168
Darren Tucker2fba9932005-02-02 23:30:24 +1100169void
Damien Miller927f5272003-11-24 12:57:25 +1100170ipv64_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
Damien Miller94cf4c82005-07-17 17:04:47 +1000177 if (addr->ss_family != AF_INET6 ||
Damien Miller927f5272003-11-24 12:57:25 +1100178 !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 Miller33804262001-02-04 23:20:18 +1100194/*
Damien Miller5428f641999-11-25 11:54:57 +1100195 * 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 Millerd4a8b7e1999-10-27 13:42:43 +1000199
Damien Miller95def091999-11-25 00:26:21 +1100200const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000201get_canonical_hostname(int use_dns)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000202{
Damien Miller34132e52000-01-14 15:45:46 +1100203 static char *canonical_host_name = NULL;
Damien Miller3a961dc2003-06-03 10:25:48 +1000204 static int use_dns_done = 0;
Damien Miller34132e52000-01-14 15:45:46 +1100205
Damien Miller33804262001-02-04 23:20:18 +1100206 /* Check if we have previously retrieved name with same option. */
207 if (canonical_host_name != NULL) {
Damien Miller3a961dc2003-06-03 10:25:48 +1000208 if (use_dns_done != use_dns)
Damien Miller33804262001-02-04 23:20:18 +1100209 xfree(canonical_host_name);
210 else
211 return canonical_host_name;
212 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000213
Damien Miller95def091999-11-25 00:26:21 +1100214 /* Get the real hostname if socket; otherwise return UNKNOWN. */
Damien Miller34132e52000-01-14 15:45:46 +1100215 if (packet_connection_is_on_socket())
Damien Miller33804262001-02-04 23:20:18 +1100216 canonical_host_name = get_remote_hostname(
Damien Miller3a961dc2003-06-03 10:25:48 +1000217 packet_get_connection_in(), use_dns);
Damien Miller95def091999-11-25 00:26:21 +1100218 else
219 canonical_host_name = xstrdup("UNKNOWN");
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000220
Damien Miller3a961dc2003-06-03 10:25:48 +1000221 use_dns_done = use_dns;
Damien Miller95def091999-11-25 00:26:21 +1100222 return canonical_host_name;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000223}
224
Damien Miller5428f641999-11-25 11:54:57 +1100225/*
Ben Lindstromacaac972002-12-23 02:13:37 +0000226 * Returns the local/remote IP-address/hostname of socket as a string.
227 * The returned string must be freed.
Damien Millerd83ff352001-01-30 09:19:34 +1100228 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000229static char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000230get_socket_address(int sock, int remote, int flags)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000231{
232 struct sockaddr_storage addr;
233 socklen_t addrlen;
234 char ntop[NI_MAXHOST];
Damien Miller9b8073e2005-03-01 21:16:18 +1100235 int r;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000236
237 /* Get IP address of client. */
238 addrlen = sizeof(addr);
239 memset(&addr, 0, sizeof(addr));
240
241 if (remote) {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000242 if (getpeername(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000243 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000244 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000245 } else {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000246 if (getsockname(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000247 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000248 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000249 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100250
251 /* Work around Linux IPv6 weirdness */
252 if (addr.ss_family == AF_INET6)
253 addrlen = sizeof(struct sockaddr_in6);
254
Darren Tucker5b115d42005-05-03 19:05:32 +1000255 ipv64_normalise_mapped(&addr, &addrlen);
256
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000257 /* Get the address in ascii. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100258 if ((r = getnameinfo((struct sockaddr *)&addr, addrlen, ntop,
259 sizeof(ntop), NULL, 0, flags)) != 0) {
260 error("get_socket_address: getnameinfo %d failed: %s", flags,
261 r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r));
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000262 return NULL;
263 }
264 return xstrdup(ntop);
265}
Damien Millerd83ff352001-01-30 09:19:34 +1100266
267char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000268get_peer_ipaddr(int sock)
Damien Millerd83ff352001-01-30 09:19:34 +1100269{
Damien Millerb2f844d2002-09-25 12:19:08 +1000270 char *p;
271
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000272 if ((p = get_socket_address(sock, 1, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000273 return p;
274 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000275}
Damien Millerd83ff352001-01-30 09:19:34 +1100276
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000277char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000278get_local_ipaddr(int sock)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000279{
Damien Millerb2f844d2002-09-25 12:19:08 +1000280 char *p;
281
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000282 if ((p = get_socket_address(sock, 0, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000283 return p;
284 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000285}
286
287char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000288get_local_name(int sock)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000289{
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000290 return get_socket_address(sock, 0, NI_NAMEREQD);
Damien Millerd83ff352001-01-30 09:19:34 +1100291}
292
293/*
Damien Miller5428f641999-11-25 11:54:57 +1100294 * Returns the IP-address of the remote host as a string. The returned
Damien Miller34132e52000-01-14 15:45:46 +1100295 * string must not be freed.
Damien Miller5428f641999-11-25 11:54:57 +1100296 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000297
Damien Miller95def091999-11-25 00:26:21 +1100298const char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000299get_remote_ipaddr(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000300{
Damien Miller34132e52000-01-14 15:45:46 +1100301 static char *canonical_host_ip = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000302
Damien Millerd83ff352001-01-30 09:19:34 +1100303 /* Check whether we have cached the ipaddr. */
304 if (canonical_host_ip == NULL) {
305 if (packet_connection_is_on_socket()) {
306 canonical_host_ip =
307 get_peer_ipaddr(packet_get_connection_in());
308 if (canonical_host_ip == NULL)
Darren Tucker3e33cec2003-10-02 16:12:36 +1000309 cleanup_exit(255);
Damien Millerd83ff352001-01-30 09:19:34 +1100310 } else {
311 /* If not on socket, return UNKNOWN. */
312 canonical_host_ip = xstrdup("UNKNOWN");
313 }
Damien Miller95def091999-11-25 00:26:21 +1100314 }
Damien Miller95def091999-11-25 00:26:21 +1100315 return canonical_host_ip;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000316}
317
Ben Lindstromf15a3862001-04-05 23:32:17 +0000318const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000319get_remote_name_or_ip(u_int utmp_len, int use_dns)
Ben Lindstromf15a3862001-04-05 23:32:17 +0000320{
321 static const char *remote = "";
322 if (utmp_len > 0)
Damien Miller3a961dc2003-06-03 10:25:48 +1000323 remote = get_canonical_hostname(use_dns);
Ben Lindstromf15a3862001-04-05 23:32:17 +0000324 if (utmp_len == 0 || strlen(remote) > utmp_len)
325 remote = get_remote_ipaddr();
326 return remote;
327}
328
Damien Miller34132e52000-01-14 15:45:46 +1100329/* Returns the local/remote port for the socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000330
Ben Lindstrombba81212001-06-25 05:01:22 +0000331static int
Damien Miller34132e52000-01-14 15:45:46 +1100332get_sock_port(int sock, int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000333{
Damien Miller34132e52000-01-14 15:45:46 +1100334 struct sockaddr_storage from;
335 socklen_t fromlen;
336 char strport[NI_MAXSERV];
Damien Miller9b8073e2005-03-01 21:16:18 +1100337 int r;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000338
Damien Miller95def091999-11-25 00:26:21 +1100339 /* Get IP address of client. */
340 fromlen = sizeof(from);
341 memset(&from, 0, sizeof(from));
Damien Miller34132e52000-01-14 15:45:46 +1100342 if (local) {
343 if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) {
344 error("getsockname failed: %.100s", strerror(errno));
345 return 0;
346 }
347 } else {
Ben Lindstromacaac972002-12-23 02:13:37 +0000348 if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +1100349 debug("getpeername failed: %.100s", strerror(errno));
Damien Miller677257f2005-06-17 12:55:03 +1000350 return -1;
Damien Miller34132e52000-01-14 15:45:46 +1100351 }
Damien Miller95def091999-11-25 00:26:21 +1100352 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100353
354 /* Work around Linux IPv6 weirdness */
355 if (from.ss_family == AF_INET6)
356 fromlen = sizeof(struct sockaddr_in6);
357
Damien Miller95def091999-11-25 00:26:21 +1100358 /* Return port number. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100359 if ((r = getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0,
360 strport, sizeof(strport), NI_NUMERICSERV)) != 0)
361 fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed: %s",
362 r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r));
Damien Miller34132e52000-01-14 15:45:46 +1100363 return atoi(strport);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000364}
365
Damien Miller34132e52000-01-14 15:45:46 +1100366/* Returns remote/local port number for the current connection. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000367
Ben Lindstrombba81212001-06-25 05:01:22 +0000368static int
Damien Miller34132e52000-01-14 15:45:46 +1100369get_port(int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000370{
Damien Miller5428f641999-11-25 11:54:57 +1100371 /*
372 * If the connection is not a socket, return 65535. This is
373 * intentionally chosen to be an unprivileged port number.
374 */
Damien Miller34132e52000-01-14 15:45:46 +1100375 if (!packet_connection_is_on_socket())
Damien Miller95def091999-11-25 00:26:21 +1100376 return 65535;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000377
Damien Miller34132e52000-01-14 15:45:46 +1100378 /* Get socket and return the port number. */
379 return get_sock_port(packet_get_connection_in(), local);
380}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000381
Damien Miller4af51302000-04-16 11:18:38 +1000382int
Damien Miller34132e52000-01-14 15:45:46 +1100383get_peer_port(int sock)
384{
385 return get_sock_port(sock, 0);
386}
387
Damien Miller4af51302000-04-16 11:18:38 +1000388int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000389get_remote_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100390{
Damien Miller0670c732004-07-21 21:53:34 +1000391 static int port = -1;
392
393 /* Cache to avoid getpeername() on a dead connection */
394 if (port == -1)
395 port = get_port(0);
396
397 return port;
Damien Miller34132e52000-01-14 15:45:46 +1100398}
399
400int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000401get_local_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100402{
403 return get_port(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000404}