5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2006 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 /* Returns bound port from listener */
25 SilcUInt16 *silc_net_listener_get_port(SilcNetListener listener,
26 SilcUInt32 *port_count)
31 ports = silc_calloc(listener->socks_count, sizeof(*ports));
35 for (i = 0; i < listener->socks_count; i++)
36 ports[i] = silc_net_get_local_port(listener->socks[i]);
39 *port_count = listener->socks_count;
44 /* Accepts a connection from a particular socket */
46 int silc_net_accept_connection(int sock)
48 return accept(sock, 0, 0);
51 /* Sets a option for a socket. */
53 int silc_net_set_socket_opt(int sock, int level, int option, int on)
55 return setsockopt(sock, level, option, (void *)&on, sizeof(on));
58 /* Get socket options */
60 int silc_net_get_socket_opt(int sock, int level, int option,
61 void *optval, int *opt_len)
63 return getsockopt(sock, level, option, optval, opt_len);
66 /* Checks whether IP address sent as argument is valid IPv4 address. */
68 SilcBool silc_net_is_ip4(const char *addr)
73 if (*addr != '.' && !isdigit(*addr))
86 /* Checks whether IP address sent as argument is valid IPv6 address. */
88 SilcBool silc_net_is_ip6(const char *addr)
90 /* XXX does this work with all kinds of IPv6 addresses? */
92 if (*addr != ':' && !isxdigit(*addr))
100 /* Checks whether IP address sent as argument is valid IP address. */
102 SilcBool silc_net_is_ip(const char *addr)
104 if (silc_net_is_ip4(addr))
106 return silc_net_is_ip6(addr);
109 /* Internal context for async resolving */
111 SilcNetResolveCallback completion;
113 SilcBool prefer_ipv6;
114 SilcSchedule schedule;
117 } *SilcNetResolveContext;
119 SILC_TASK_CALLBACK(silc_net_resolve_completion)
121 SilcNetResolveContext r = (SilcNetResolveContext)context;
123 /* Call the completion callback */
125 (*r->completion)(r->result, r->context);
128 silc_free(r->result);
132 /* Thread function to resolve the address for hostname. */
134 static void *silc_net_gethostbyname_thread(void *context)
136 SilcNetResolveContext r = (SilcNetResolveContext)context;
137 SilcSchedule schedule = r->schedule;
140 if (silc_net_gethostbyname(r->input, r->prefer_ipv6, tmp, sizeof(tmp)))
141 r->result = strdup(tmp);
143 silc_schedule_task_add(schedule, 0, silc_net_resolve_completion, r, 0, 1,
145 silc_schedule_wakeup(schedule);
149 /* Thread function to resolve the hostname for address. */
151 static void *silc_net_gethostbyaddr_thread(void *context)
153 SilcNetResolveContext r = (SilcNetResolveContext)context;
154 SilcSchedule schedule = r->schedule;
157 if (silc_net_gethostbyaddr(r->input, tmp, sizeof(tmp)))
158 r->result = strdup(tmp);
160 silc_schedule_task_add(schedule, 0, silc_net_resolve_completion, r, 0, 1,
162 silc_schedule_wakeup(schedule);
166 /* Resolves IP address for hostname. */
168 SilcBool silc_net_gethostbyname(const char *name,
169 SilcBool prefer_ipv6, char *address,
170 SilcUInt32 address_len)
173 struct addrinfo hints, *ai, *tmp, *ip4 = NULL, *ip6 = NULL;
175 memset(&hints, 0, sizeof(hints));
176 hints.ai_socktype = SOCK_STREAM;
177 if (getaddrinfo(name, NULL, &hints, &ai))
180 for (tmp = ai; tmp; tmp = tmp->ai_next) {
181 if (tmp->ai_family == AF_INET6) {
187 if (tmp->ai_family == AF_INET) {
195 tmp = (prefer_ipv6 ? (ip6 ? ip6 : ip4) : (ip4 ? ip4 : ip6));
201 if (getnameinfo(tmp->ai_addr, tmp->ai_addrlen, address,
202 address_len, NULL, 0, NI_NUMERICHOST)) {
213 hp = gethostbyname(name);
217 memcpy(&ip.s_addr, hp->h_addr_list[0], 4);
221 if (address_len < strlen(tmp))
223 memset(address, 0, address_len);
224 strncpy(address, tmp, strlen(tmp));
230 /* Resolves IP address for hostname async. */
232 void silc_net_gethostbyname_async(const char *name,
233 SilcBool prefer_ipv6,
234 SilcSchedule schedule,
235 SilcNetResolveCallback completion,
238 SilcNetResolveContext r = silc_calloc(1, sizeof(*r));
240 r->completion = completion;
241 r->context = context;
242 r->prefer_ipv6 = prefer_ipv6;
243 r->schedule = schedule;
244 r->input = strdup(name);
246 silc_thread_create(silc_net_gethostbyname_thread, r, FALSE);
249 /* Resolves hostname by IP address. */
251 SilcBool silc_net_gethostbyaddr(const char *addr, char *name, SilcUInt32 name_len)
254 struct addrinfo req, *ai;
256 memset(&req, 0, sizeof(req));
257 req.ai_socktype = SOCK_STREAM;
258 req.ai_flags = AI_CANONNAME;
260 if (getaddrinfo(addr, NULL, &req, &ai))
262 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, name, name_len, NULL, 0, 0)) {
271 if (!silc_net_addr2bin(addr, a, sizeof(a)))
274 hp = gethostbyaddr(a, 4, AF_INET);
277 if (name_len < strlen(hp->h_name))
279 memset(name, 0, name_len);
280 strncpy(name, hp->h_name, strlen(hp->h_name));
286 /* Resolves hostname by IP address async. */
288 void silc_net_gethostbyaddr_async(const char *addr,
289 SilcSchedule schedule,
290 SilcNetResolveCallback completion,
293 SilcNetResolveContext r = silc_calloc(1, sizeof(*r));
295 r->completion = completion;
296 r->context = context;
297 r->schedule = schedule;
298 r->input = strdup(addr);
300 silc_thread_create(silc_net_gethostbyaddr_thread, r, FALSE);
303 /* Performs lookups for remote name and IP address. This peforms reverse
304 lookup as well to verify that the IP has FQDN. */
306 SilcBool silc_net_check_host_by_sock(int sock, char **hostname, char **ip)
312 struct sockaddr_storage remote;
319 SILC_LOG_DEBUG(("Resolving remote hostname and IP address"));
321 memset(&remote, 0, sizeof(remote));
322 memset(&s, 0, sizeof(s));
323 len = sizeof(remote);
324 rval = getpeername(sock, (struct sockaddr *)&remote, &len);
328 if (getnameinfo((struct sockaddr *)&remote, len, s, sizeof(s), NULL, 0,
332 *ip = silc_memdup(s, strlen(s));
336 struct sockaddr_in remote;
343 SILC_LOG_DEBUG(("Resolving remote hostname and IP address"));
345 memset(&remote, 0, sizeof(remote));
346 len = sizeof(remote);
347 rval = getpeername(sock, (struct sockaddr *)&remote, &len);
351 host_ip = inet_ntoa(remote.sin_addr);
355 *ip = silc_memdup(host_ip, strlen(host_ip));
360 /* Do reverse lookup if we want hostname too. */
362 /* Get host by address */
363 if (!silc_net_gethostbyaddr(*ip, host, sizeof(host)))
366 *hostname = silc_memdup(host, strlen(host));
367 SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
370 if (!silc_net_gethostbyname(*hostname, TRUE, host, sizeof(host)))
373 if (strcmp(*ip, host))
377 SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
381 /* Performs lookups for local name and IP address. This peforms reverse
382 lookup as well to verify that the IP has FQDN. */
384 SilcBool silc_net_check_local_by_sock(int sock, char **hostname, char **ip)
390 struct sockaddr_storage local;
397 SILC_LOG_DEBUG(("Resolving local hostname and IP address"));
399 memset(&local, 0, sizeof(local));
400 memset(&s, 0, sizeof(s));
402 rval = getsockname(sock, (struct sockaddr *)&local, &len);
406 if (getnameinfo((struct sockaddr *)&local, len, s, sizeof(s), NULL, 0,
410 *ip = silc_memdup(s, strlen(s));
414 struct sockaddr_in local;
421 SILC_LOG_DEBUG(("Resolving local hostname and IP address"));
423 memset(&local, 0, sizeof(local));
425 rval = getsockname(sock, (struct sockaddr *)&local, &len);
429 host_ip = inet_ntoa(local.sin_addr);
433 *ip = silc_memdup(host_ip, strlen(host_ip));
438 /* Do reverse lookup if we want hostname too. */
440 /* Get host by address */
441 if (!silc_net_gethostbyaddr(*ip, host, sizeof(host)))
444 *hostname = silc_memdup(host, strlen(host));
445 SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
448 if (!silc_net_gethostbyname(*hostname, TRUE, host, sizeof(host)))
451 if (strcmp(*ip, host))
455 SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
459 /* Return remote port by socket. */
461 SilcUInt16 silc_net_get_remote_port(int sock)
464 struct sockaddr_storage remote;
468 memset(&remote, 0, sizeof(remote));
469 len = sizeof(remote);
470 if (getpeername(sock, (struct sockaddr *)&remote, &len) < 0)
473 if (getnameinfo((struct sockaddr *)&remote, len, NULL, 0, s, sizeof(s),
479 struct sockaddr_in remote;
482 memset(&remote, 0, sizeof(remote));
483 len = sizeof(remote);
484 if (getpeername(sock, (struct sockaddr *)&remote, &len) < 0)
487 return ntohs(remote.sin_port);
491 /* Return local port by socket. */
493 SilcUInt16 silc_net_get_local_port(int sock)
496 struct sockaddr_storage local;
500 memset(&local, 0, sizeof(local));
502 if (getsockname(sock, (struct sockaddr *)&local, &len) < 0)
505 if (getnameinfo((struct sockaddr *)&local, len, NULL, 0, s, sizeof(s),
511 struct sockaddr_in local;
514 memset(&local, 0, sizeof(local));
516 if (getsockname(sock, (struct sockaddr *)&local, &len) < 0)
519 return ntohs(local.sin_port);
523 /* Return name of localhost. */
525 char *silc_net_localhost(void)
527 char hostname[256], ip_addr[64];
529 if (gethostname(hostname, sizeof(hostname)))
532 if (!silc_net_gethostbyname(hostname, TRUE, ip_addr, sizeof(ip_addr)))
533 return strdup(hostname);
535 silc_net_gethostbyaddr(ip_addr, hostname, sizeof(hostname));
536 return strdup(hostname);
539 /* Returns local IP address */
541 char *silc_net_localip(void)
543 char hostname[256], ip_addr[64];
545 if (gethostname(hostname, sizeof(hostname)))
548 if (!silc_net_gethostbyname(hostname, TRUE, ip_addr, sizeof(ip_addr)))
551 return strdup(ip_addr);