5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2005 Pekka Riikonen
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; version 2 of the License.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
23 /* Accepts a connection from a particular socket */
25 int silc_net_accept_connection(int sock)
27 return accept(sock, 0, 0);
30 /* Sets a option for a socket. */
32 int silc_net_set_socket_opt(int sock, int level, int option, int on)
34 return setsockopt(sock, level, option, (void *)&on, sizeof(on));
37 /* Get socket options */
39 int silc_net_get_socket_opt(int sock, int level, int option,
40 void *optval, int *opt_len)
42 return getsockopt(sock, level, option, optval, opt_len);
45 /* Checks whether IP address sent as argument is valid IPv4 address. */
47 SilcBool silc_net_is_ip4(const char *addr)
52 if (*addr != '.' && !isdigit(*addr))
65 /* Checks whether IP address sent as argument is valid IPv6 address. */
67 SilcBool silc_net_is_ip6(const char *addr)
69 /* XXX does this work with all kinds of IPv6 addresses? */
71 if (*addr != ':' && !isxdigit(*addr))
79 /* Checks whether IP address sent as argument is valid IP address. */
81 SilcBool silc_net_is_ip(const char *addr)
83 if (silc_net_is_ip4(addr))
85 return silc_net_is_ip6(addr);
88 /* Internal context for async resolving */
90 SilcNetResolveCallback completion;
93 SilcSchedule schedule;
96 } *SilcNetResolveContext;
98 SILC_TASK_CALLBACK(silc_net_resolve_completion)
100 SilcNetResolveContext r = (SilcNetResolveContext)context;
102 /* Call the completion callback */
104 (*r->completion)(r->result, r->context);
107 silc_free(r->result);
111 /* Thread function to resolve the address for hostname. */
113 static void *silc_net_gethostbyname_thread(void *context)
115 SilcNetResolveContext r = (SilcNetResolveContext)context;
116 SilcSchedule schedule = r->schedule;
119 if (silc_net_gethostbyname(r->input, r->prefer_ipv6, tmp, sizeof(tmp)))
120 r->result = strdup(tmp);
122 silc_schedule_task_add(schedule, 0, silc_net_resolve_completion, r, 0, 1,
124 silc_schedule_wakeup(schedule);
128 /* Thread function to resolve the hostname for address. */
130 static void *silc_net_gethostbyaddr_thread(void *context)
132 SilcNetResolveContext r = (SilcNetResolveContext)context;
133 SilcSchedule schedule = r->schedule;
136 if (silc_net_gethostbyaddr(r->input, tmp, sizeof(tmp)))
137 r->result = strdup(tmp);
139 silc_schedule_task_add(schedule, 0, silc_net_resolve_completion, r, 0, 1,
141 silc_schedule_wakeup(schedule);
145 /* Resolves IP address for hostname. */
147 SilcBool silc_net_gethostbyname(const char *name,
148 SilcBool prefer_ipv6, char *address,
149 SilcUInt32 address_len)
152 struct addrinfo hints, *ai, *tmp, *ip4 = NULL, *ip6 = NULL;
154 memset(&hints, 0, sizeof(hints));
155 hints.ai_socktype = SOCK_STREAM;
156 if (getaddrinfo(name, NULL, &hints, &ai))
159 for (tmp = ai; tmp; tmp = tmp->ai_next) {
160 if (tmp->ai_family == AF_INET6) {
166 if (tmp->ai_family == AF_INET) {
174 tmp = (prefer_ipv6 ? (ip6 ? ip6 : ip4) : (ip4 ? ip4 : ip6));
180 if (getnameinfo(tmp->ai_addr, tmp->ai_addrlen, address,
181 address_len, NULL, 0, NI_NUMERICHOST)) {
192 hp = gethostbyname(name);
196 memcpy(&ip.s_addr, hp->h_addr_list[0], 4);
200 if (address_len < strlen(tmp))
202 memset(address, 0, address_len);
203 strncpy(address, tmp, strlen(tmp));
209 /* Resolves IP address for hostname async. */
211 void silc_net_gethostbyname_async(const char *name,
212 SilcBool prefer_ipv6,
213 SilcSchedule schedule,
214 SilcNetResolveCallback completion,
217 SilcNetResolveContext r = silc_calloc(1, sizeof(*r));
219 r->completion = completion;
220 r->context = context;
221 r->prefer_ipv6 = prefer_ipv6;
222 r->schedule = schedule;
223 r->input = strdup(name);
225 silc_thread_create(silc_net_gethostbyname_thread, r, FALSE);
228 /* Resolves hostname by IP address. */
230 SilcBool silc_net_gethostbyaddr(const char *addr, char *name, SilcUInt32 name_len)
233 struct addrinfo req, *ai;
235 memset(&req, 0, sizeof(req));
236 req.ai_socktype = SOCK_STREAM;
237 req.ai_flags = AI_CANONNAME;
239 if (getaddrinfo(addr, NULL, &req, &ai))
241 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, name, name_len, NULL, 0, 0)) {
250 if (!silc_net_addr2bin(addr, a, sizeof(a)))
253 hp = gethostbyaddr(a, 4, AF_INET);
256 if (name_len < strlen(hp->h_name))
258 memset(name, 0, name_len);
259 strncpy(name, hp->h_name, strlen(hp->h_name));
265 /* Resolves hostname by IP address async. */
267 void silc_net_gethostbyaddr_async(const char *addr,
268 SilcSchedule schedule,
269 SilcNetResolveCallback completion,
272 SilcNetResolveContext r = silc_calloc(1, sizeof(*r));
274 r->completion = completion;
275 r->context = context;
276 r->schedule = schedule;
277 r->input = strdup(addr);
279 silc_thread_create(silc_net_gethostbyaddr_thread, r, FALSE);
282 /* Performs lookups for remote name and IP address. This peforms reverse
283 lookup as well to verify that the IP has FQDN. */
285 SilcBool silc_net_check_host_by_sock(int sock, char **hostname, char **ip)
291 struct sockaddr_storage remote;
298 SILC_LOG_DEBUG(("Resolving remote hostname and IP address"));
300 memset(&remote, 0, sizeof(remote));
301 memset(&s, 0, sizeof(s));
302 len = sizeof(remote);
303 rval = getpeername(sock, (struct sockaddr *)&remote, &len);
307 if (getnameinfo((struct sockaddr *)&remote, len, s, sizeof(s), NULL, 0,
311 *ip = silc_memdup(s, strlen(s));
315 struct sockaddr_in remote;
322 SILC_LOG_DEBUG(("Resolving remote hostname and IP address"));
324 memset(&remote, 0, sizeof(remote));
325 len = sizeof(remote);
326 rval = getpeername(sock, (struct sockaddr *)&remote, &len);
330 host_ip = inet_ntoa(remote.sin_addr);
334 *ip = silc_memdup(host_ip, strlen(host_ip));
339 /* Do reverse lookup if we want hostname too. */
341 /* Get host by address */
342 if (!silc_net_gethostbyaddr(*ip, host, sizeof(host)))
345 *hostname = silc_memdup(host, strlen(host));
346 SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
349 if (!silc_net_gethostbyname(*hostname, TRUE, host, sizeof(host)))
352 if (strcmp(*ip, host))
356 SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
360 /* Performs lookups for local name and IP address. This peforms reverse
361 lookup as well to verify that the IP has FQDN. */
363 SilcBool silc_net_check_local_by_sock(int sock, char **hostname, char **ip)
369 struct sockaddr_storage local;
376 SILC_LOG_DEBUG(("Resolving local hostname and IP address"));
378 memset(&local, 0, sizeof(local));
379 memset(&s, 0, sizeof(s));
381 rval = getsockname(sock, (struct sockaddr *)&local, &len);
385 if (getnameinfo((struct sockaddr *)&local, len, s, sizeof(s), NULL, 0,
389 *ip = silc_memdup(s, strlen(s));
393 struct sockaddr_in local;
400 SILC_LOG_DEBUG(("Resolving local hostname and IP address"));
402 memset(&local, 0, sizeof(local));
404 rval = getsockname(sock, (struct sockaddr *)&local, &len);
408 host_ip = inet_ntoa(local.sin_addr);
412 *ip = silc_memdup(host_ip, strlen(host_ip));
417 /* Do reverse lookup if we want hostname too. */
419 /* Get host by address */
420 if (!silc_net_gethostbyaddr(*ip, host, sizeof(host)))
423 *hostname = silc_memdup(host, strlen(host));
424 SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
427 if (!silc_net_gethostbyname(*hostname, TRUE, host, sizeof(host)))
430 if (strcmp(*ip, host))
434 SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
438 /* Return remote port by socket. */
440 SilcUInt16 silc_net_get_remote_port(int sock)
443 struct sockaddr_storage remote;
447 memset(&remote, 0, sizeof(remote));
448 len = sizeof(remote);
449 if (getpeername(sock, (struct sockaddr *)&remote, &len) < 0)
452 if (getnameinfo((struct sockaddr *)&remote, len, NULL, 0, s, sizeof(s),
458 struct sockaddr_in remote;
461 memset(&remote, 0, sizeof(remote));
462 len = sizeof(remote);
463 if (getpeername(sock, (struct sockaddr *)&remote, &len) < 0)
466 return ntohs(remote.sin_port);
470 /* Return local port by socket. */
472 SilcUInt16 silc_net_get_local_port(int sock)
475 struct sockaddr_storage local;
479 memset(&local, 0, sizeof(local));
481 if (getsockname(sock, (struct sockaddr *)&local, &len) < 0)
484 if (getnameinfo((struct sockaddr *)&local, len, NULL, 0, s, sizeof(s),
490 struct sockaddr_in local;
493 memset(&local, 0, sizeof(local));
495 if (getsockname(sock, (struct sockaddr *)&local, &len) < 0)
498 return ntohs(local.sin_port);
502 /* Return name of localhost. */
504 char *silc_net_localhost(void)
506 char hostname[256], ip_addr[64];
508 if (gethostname(hostname, sizeof(hostname)))
511 if (!silc_net_gethostbyname(hostname, TRUE, ip_addr, sizeof(ip_addr)))
512 return strdup(hostname);
514 silc_net_gethostbyaddr(ip_addr, hostname, sizeof(hostname));
515 return strdup(hostname);
518 /* Returns local IP address */
520 char *silc_net_localip(void)
522 char hostname[256], ip_addr[64];
524 if (gethostname(hostname, sizeof(hostname)))
527 if (!silc_net_gethostbyname(hostname, TRUE, ip_addr, sizeof(ip_addr)))
530 return strdup(ip_addr);