5 Author: Pekka Riikonen <priikone@silcnet.org>
7 Copyright (C) 1997 - 2001 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; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
22 #include "silcincludes.h"
25 /* Accepts a connection from a particular socket */
27 int silc_net_accept_connection(int sock)
29 return accept(sock, 0, 0);
32 /* Sets a option for a socket. */
34 int silc_net_set_socket_opt(int sock, int level, int option, int on)
36 return setsockopt(sock, level, option, (void *)&on, sizeof(on));
39 /* Get socket options */
41 int silc_net_get_socket_opt(int sock, int level, int option,
42 void *optval, int *opt_len)
44 return getsockopt(sock, level, option, optval, opt_len);
47 /* Checks whether IP address sent as argument is valid IPv4 address. */
49 bool silc_net_is_ip4(const char *addr)
54 if (*addr != '.' && !isdigit(*addr))
67 /* Checks whether IP address sent as argument is valid IPv6 address. */
69 bool silc_net_is_ip6(const char *addr)
71 /* XXX does this work with all kinds of IPv6 addresses? */
73 if (*addr != ':' && !isxdigit(*addr))
81 /* Checks whether IP address sent as argument is valid IP address. */
83 bool silc_net_is_ip(const char *addr)
85 if (silc_net_is_ip4(addr))
87 return silc_net_is_ip6(addr);
90 /* Internal context for async resolving */
92 SilcNetResolveCallback completion;
95 SilcSchedule schedule;
98 } *SilcNetResolveContext;
100 SILC_TASK_CALLBACK(silc_net_resolve_completion)
102 SilcNetResolveContext r = (SilcNetResolveContext)context;
104 /* Call the completion callback */
106 (*r->completion)(r->result, r->context);
109 silc_free(r->result);
113 /* Thread function to resolve the address for hostname. */
115 static void *silc_net_gethostbyname_thread(void *context)
117 SilcNetResolveContext r = (SilcNetResolveContext)context;
120 if (silc_net_gethostbyname(r->input, r->prefer_ipv6, tmp, sizeof(tmp)))
121 r->result = strdup(tmp);
123 silc_schedule_task_add(r->schedule, 0, silc_net_resolve_completion, r, 0, 1,
124 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
125 silc_schedule_wakeup(r->schedule);
129 /* Thread function to resolve the hostname for address. */
131 static void *silc_net_gethostbyaddr_thread(void *context)
133 SilcNetResolveContext r = (SilcNetResolveContext)context;
136 if (silc_net_gethostbyaddr(r->input, tmp, sizeof(tmp)))
137 r->result = strdup(tmp);
139 silc_schedule_task_add(r->schedule, 0, silc_net_resolve_completion, r, 0, 1,
140 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
141 silc_schedule_wakeup(r->schedule);
145 /* Resolves IP address for hostname. */
147 bool silc_net_gethostbyname(const char *name, bool prefer_ipv6, char *address,
151 struct addrinfo hints, *ai, *tmp, *ip4 = NULL, *ip6 = NULL;
153 memset(&hints, 0, sizeof(hints));
154 hints.ai_socktype = SOCK_STREAM;
155 if (getaddrinfo(name, NULL, &hints, &ai))
158 for (tmp = ai; tmp; tmp = tmp->ai_next) {
159 if (tmp->ai_family == AF_INET6) {
165 if (tmp->ai_family == AF_INET) {
173 tmp = (prefer_ipv6 ? (ip6 ? ip6 : ip4) : (ip4 ? ip4 : ip6));
179 if (getnameinfo(tmp->ai_addr, tmp->ai_addrlen, address,
180 address_len, NULL, 0, NI_NUMERICHOST)) {
191 hp = gethostbyname(name);
195 memcpy(&ip.s_addr, hp->h_addr_list[0], 4);
199 if (address_len < strlen(tmp))
201 memset(address, 0, address_len);
202 strncpy(address, tmp, strlen(tmp));
208 /* Resolves IP address for hostname async. */
210 void silc_net_gethostbyname_async(const char *name,
212 SilcSchedule schedule,
213 SilcNetResolveCallback completion,
216 SilcNetResolveContext r = silc_calloc(1, sizeof(*r));
218 r->completion = completion;
219 r->context = context;
220 r->prefer_ipv6 = prefer_ipv6;
221 r->schedule = schedule;
222 r->input = strdup(name);
224 silc_thread_create(silc_net_gethostbyname_thread, r, FALSE);
227 /* Resolves hostname by IP address. */
229 bool silc_net_gethostbyaddr(const char *addr, char *name, uint32 name_len)
232 struct addrinfo req, *ai;
234 memset(&req, 0, sizeof(req));
235 req.ai_socktype = SOCK_STREAM;
236 req.ai_flags = AI_CANONNAME;
238 if (getaddrinfo(addr, NULL, &req, &ai))
240 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, name, name_len, NULL, 0, 0)) {
248 hp = gethostbyaddr(addr, strlen(addr), AF_INET);
251 if (name_len < strlen(hp->h_name))
253 memset(name, 0, name_len);
254 strncpy(name, hp->h_name, strlen(hp->h_name));
260 /* Resolves hostname by IP address async. */
262 void silc_net_gethostbyaddr_async(const char *addr,
263 SilcSchedule schedule,
264 SilcNetResolveCallback completion,
267 SilcNetResolveContext r = silc_calloc(1, sizeof(*r));
269 r->completion = completion;
270 r->context = context;
271 r->schedule = schedule;
272 r->input = strdup(addr);
274 silc_thread_create(silc_net_gethostbyaddr_thread, r, FALSE);
277 /* Performs lookups for remote name and IP address. This peforms reverse
278 lookup as well to verify that the IP has FQDN. */
280 bool silc_net_check_host_by_sock(int sock, char **hostname, char **ip)
282 struct sockaddr_in remote;
283 struct hostent *dest;
284 char *host_ip = NULL;
285 char host_name[1024];
292 SILC_LOG_DEBUG(("Resolving remote hostname and IP address"));
294 memset(&remote, 0, sizeof(remote));
295 len = sizeof(remote);
296 rval = getpeername(sock, (struct sockaddr *)&remote, &len);
300 host_ip = inet_ntoa(remote.sin_addr);
304 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
305 memcpy(*ip, host_ip, strlen(host_ip));
307 /* Get host by address */
308 dest = gethostbyaddr((char *)&remote.sin_addr,
309 sizeof(struct in_addr), AF_INET);
313 /* Get same host by name to see that the remote host really is
314 the who it says it is */
315 memset(host_name, 0, sizeof(host_name));
316 memcpy(host_name, dest->h_name, strlen(dest->h_name));
318 *hostname = silc_calloc(strlen(host_name) + 1, sizeof(char));
319 memcpy(*hostname, host_name, strlen(host_name));
320 SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
322 dest = gethostbyname(host_name);
326 /* Find the address from list */
327 for (i = 0; dest->h_addr_list[i]; i++)
328 if (!memcmp(dest->h_addr_list[i], &remote.sin_addr,
329 sizeof(struct in_addr)))
331 if (!dest->h_addr_list[i])
335 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
336 memcpy(*ip, host_ip, strlen(host_ip));
337 SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
342 /* Performs lookups for local name and IP address. This peforms reverse
343 lookup as well to verify that the IP has FQDN. */
345 bool silc_net_check_local_by_sock(int sock, char **hostname, char **ip)
347 struct sockaddr_in local;
348 struct hostent *dest;
349 char *host_ip = NULL;
350 char host_name[1024];
357 SILC_LOG_DEBUG(("Resolving local hostname and IP address"));
359 memset(&local, 0, sizeof(local));
361 rval = getsockname(sock, (struct sockaddr *)&local, &len);
365 host_ip = inet_ntoa(local.sin_addr);
369 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
370 memcpy(*ip, host_ip, strlen(host_ip));
372 /* Get host by address */
373 dest = gethostbyaddr((char *)&local.sin_addr,
374 sizeof(struct in_addr), AF_INET);
378 /* Get same host by name to see that the local host really is
379 the who it says it is */
380 memset(host_name, 0, sizeof(host_name));
381 memcpy(host_name, dest->h_name, strlen(dest->h_name));
383 *hostname = silc_calloc(strlen(host_name) + 1, sizeof(char));
384 memcpy(*hostname, host_name, strlen(host_name));
385 SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
387 dest = gethostbyname(host_name);
391 /* Find the address from list */
392 for (i = 0; dest->h_addr_list[i]; i++)
393 if (!memcmp(dest->h_addr_list[i], &local.sin_addr,
394 sizeof(struct in_addr)))
396 if (!dest->h_addr_list[i])
400 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
401 memcpy(*ip, host_ip, strlen(host_ip));
402 SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
407 /* Return remote port by socket. */
409 uint16 silc_net_get_remote_port(int sock)
412 struct sockaddr_storage remote;
416 memset(&remote, 0, sizeof(remote));
417 len = sizeof(remote);
418 if (getpeername(sock, (struct sockaddr *)&remote, &len) < 0)
421 if (getnameinfo((struct sockaddr *)&remote, len, NULL, 0, s, sizeof(s),
427 struct sockaddr_in remote;
430 memset(&remote, 0, sizeof(remote));
431 len = sizeof(remote);
432 if (getpeername(sock, (struct sockaddr *)&remote, &len) < 0)
435 return ntohs(remote.sin_port);
439 /* Return local port by socket. */
441 uint16 silc_net_get_local_port(int sock)
444 struct sockaddr_storage local;
448 memset(&local, 0, sizeof(local));
450 if (getsockname(sock, (struct sockaddr *)&local, &len) < 0)
453 if (getnameinfo((struct sockaddr *)&local, len, NULL, 0, s, sizeof(s),
459 struct sockaddr_in local;
462 memset(&local, 0, sizeof(local));
464 if (getsockname(sock, (struct sockaddr *)&local, &len) < 0)
467 return ntohs(local.sin_port);
471 /* Return name of localhost. */
473 char *silc_net_localhost(void)
475 char hostname[256], ip_addr[64];
477 if (gethostname(hostname, sizeof(hostname)))
480 if (!silc_net_gethostbyname(hostname, TRUE, ip_addr, sizeof(ip_addr)))
481 return strdup(hostname);
483 silc_net_gethostbyaddr(ip_addr, hostname, sizeof(hostname));
484 return strdup(hostname);
487 /* Returns local IP address */
489 char *silc_net_localip(void)
491 char hostname[256], ip_addr[64];
493 if (gethostname(hostname, sizeof(hostname)))
496 if (!silc_net_gethostbyname(hostname, TRUE, ip_addr, sizeof(ip_addr)))
499 return strdup(ip_addr);