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;
94 SilcSchedule schedule;
97 } *SilcNetResolveContext;
99 SILC_TASK_CALLBACK(silc_net_resolve_completion)
101 SilcNetResolveContext r = (SilcNetResolveContext)context;
103 /* Call the completion callback */
105 (*r->completion)(r->result, r->context);
108 silc_free(r->result);
112 /* Thread function to resolve the address for hostname. */
114 static void *silc_net_gethostbyname_thread(void *context)
116 SilcNetResolveContext r = (SilcNetResolveContext)context;
119 if (silc_net_gethostbyname(r->input, tmp, sizeof(tmp)))
120 r->result = strdup(tmp);
122 silc_schedule_task_add(r->schedule, 0, silc_net_resolve_completion, r, 0, 1,
123 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
124 silc_schedule_wakeup(r->schedule);
128 /* Thread function to resolve the hostname for address. */
130 static void *silc_net_gethostbyaddr_thread(void *context)
132 SilcNetResolveContext r = (SilcNetResolveContext)context;
135 if (silc_net_gethostbyaddr(r->input, tmp, sizeof(tmp)))
136 r->result = strdup(tmp);
138 silc_schedule_task_add(r->schedule, 0, silc_net_resolve_completion, r, 0, 1,
139 SILC_TASK_TIMEOUT, SILC_TASK_PRI_NORMAL);
140 silc_schedule_wakeup(r->schedule);
144 /* Resolves IP address for hostname. */
146 bool silc_net_gethostbyname(const char *name, char *address,
150 struct addrinfo hints, *ai;
152 memset(&hints, 0, sizeof(hints));
153 hints.ai_socktype = SOCK_STREAM;
154 if (getaddrinfo(name, NULL, &hints, &ai))
157 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, address,
158 address_len, NULL, 0, NI_NUMERICHOST)) {
169 hp = gethostbyname(name);
173 memcpy(&ip.s_addr, hp->h_addr_list[0], 4);
177 if (address_len < strlen(tmp))
179 memset(address, 0, address_len);
180 strncpy(address, tmp, strlen(tmp));
186 /* Resolves IP address for hostname async. */
188 void silc_net_gethostbyname_async(const char *name,
189 SilcSchedule schedule,
190 SilcNetResolveCallback completion,
193 SilcNetResolveContext r = silc_calloc(1, sizeof(*r));
195 r->completion = completion;
196 r->context = context;
197 r->schedule = schedule;
198 r->input = strdup(name);
200 silc_thread_create(silc_net_gethostbyname_thread, r, FALSE);
203 /* Resolves hostname by IP address. */
205 bool silc_net_gethostbyaddr(const char *addr, char *name, uint32 name_len)
208 struct addrinfo req, *ai;
210 memset(&req, 0, sizeof(req));
211 req.ai_socktype = SOCK_STREAM;
212 req.ai_flags = AI_CANONNAME;
214 if (getaddrinfo(addr, NULL, &req, &ai))
216 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, name, name_len, NULL, 0, 0)) {
224 hp = gethostbyaddr(addr, strlen(addr), AF_INET);
227 if (name_len < strlen(hp->h_name))
229 memset(name, 0, name_len);
230 strncpy(name, hp->h_name, strlen(hp->h_name));
236 /* Resolves hostname by IP address async. */
238 void silc_net_gethostbyaddr_async(const char *addr,
239 SilcSchedule schedule,
240 SilcNetResolveCallback completion,
243 SilcNetResolveContext r = silc_calloc(1, sizeof(*r));
245 r->completion = completion;
246 r->context = context;
247 r->schedule = schedule;
248 r->input = strdup(addr);
250 silc_thread_create(silc_net_gethostbyaddr_thread, r, FALSE);
253 /* Performs lookups for remote name and IP address. This peforms reverse
254 lookup as well to verify that the IP has FQDN. */
256 bool silc_net_check_host_by_sock(int sock, char **hostname, char **ip)
258 struct sockaddr_in remote;
259 struct hostent *dest;
260 char *host_ip = NULL;
261 char host_name[1024];
268 SILC_LOG_DEBUG(("Resolving remote hostname and IP address"));
270 memset(&remote, 0, sizeof(remote));
271 len = sizeof(remote);
272 rval = getpeername(sock, (struct sockaddr *)&remote, &len);
276 host_ip = inet_ntoa(remote.sin_addr);
280 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
281 memcpy(*ip, host_ip, strlen(host_ip));
283 /* Get host by address */
284 dest = gethostbyaddr((char *)&remote.sin_addr,
285 sizeof(struct in_addr), AF_INET);
289 /* Get same host by name to see that the remote host really is
290 the who it says it is */
291 memset(host_name, 0, sizeof(host_name));
292 memcpy(host_name, dest->h_name, strlen(dest->h_name));
294 *hostname = silc_calloc(strlen(host_name) + 1, sizeof(char));
295 memcpy(*hostname, host_name, strlen(host_name));
296 SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
298 dest = gethostbyname(host_name);
302 /* Find the address from list */
303 for (i = 0; dest->h_addr_list[i]; i++)
304 if (!memcmp(dest->h_addr_list[i], &remote.sin_addr,
305 sizeof(struct in_addr)))
307 if (!dest->h_addr_list[i])
311 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
312 memcpy(*ip, host_ip, strlen(host_ip));
313 SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
318 /* Performs lookups for local name and IP address. This peforms reverse
319 lookup as well to verify that the IP has FQDN. */
321 bool silc_net_check_local_by_sock(int sock, char **hostname, char **ip)
323 struct sockaddr_in local;
324 struct hostent *dest;
325 char *host_ip = NULL;
326 char host_name[1024];
333 SILC_LOG_DEBUG(("Resolving local hostname and IP address"));
335 memset(&local, 0, sizeof(local));
337 rval = getsockname(sock, (struct sockaddr *)&local, &len);
341 host_ip = inet_ntoa(local.sin_addr);
345 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
346 memcpy(*ip, host_ip, strlen(host_ip));
348 /* Get host by address */
349 dest = gethostbyaddr((char *)&local.sin_addr,
350 sizeof(struct in_addr), AF_INET);
354 /* Get same host by name to see that the local host really is
355 the who it says it is */
356 memset(host_name, 0, sizeof(host_name));
357 memcpy(host_name, dest->h_name, strlen(dest->h_name));
359 *hostname = silc_calloc(strlen(host_name) + 1, sizeof(char));
360 memcpy(*hostname, host_name, strlen(host_name));
361 SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
363 dest = gethostbyname(host_name);
367 /* Find the address from list */
368 for (i = 0; dest->h_addr_list[i]; i++)
369 if (!memcmp(dest->h_addr_list[i], &local.sin_addr,
370 sizeof(struct in_addr)))
372 if (!dest->h_addr_list[i])
376 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
377 memcpy(*ip, host_ip, strlen(host_ip));
378 SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
383 /* Return remote port by socket. */
385 uint16 silc_net_get_remote_port(int sock)
388 struct sockaddr_storage remote;
392 memset(&remote, 0, sizeof(remote));
393 len = sizeof(remote);
394 if (getpeername(sock, (struct sockaddr *)&remote, &len) < 0)
397 if (getnameinfo((struct sockaddr *)&remote, len, NULL, 0, s, sizeof(s),
403 struct sockaddr_in remote;
406 memset(&remote, 0, sizeof(remote));
407 len = sizeof(remote);
408 if (getpeername(sock, (struct sockaddr *)&remote, &len) < 0)
411 return ntohs(remote.sin_port);
415 /* Return local port by socket. */
417 uint16 silc_net_get_local_port(int sock)
420 struct sockaddr_storage local;
424 memset(&local, 0, sizeof(local));
426 if (getsockname(sock, (struct sockaddr *)&local, &len) < 0)
429 if (getnameinfo((struct sockaddr *)&local, len, NULL, 0, s, sizeof(s),
435 struct sockaddr_in local;
438 memset(&local, 0, sizeof(local));
440 if (getsockname(sock, (struct sockaddr *)&local, &len) < 0)
443 return ntohs(local.sin_port);
447 /* Return name of localhost. */
449 char *silc_net_localhost(void)
451 char hostname[256], ip_addr[64];
453 if (gethostname(hostname, sizeof(hostname)))
456 if (!silc_net_gethostbyname(hostname, ip_addr, sizeof(ip_addr)))
457 return strdup(hostname);
459 silc_net_gethostbyaddr(ip_addr, hostname, sizeof(hostname));
460 return strdup(hostname);
463 /* Returns local IP address */
465 char *silc_net_localip(void)
467 char hostname[256], ip_addr[64];
469 if (gethostname(hostname, sizeof(hostname)))
472 if (!silc_net_gethostbyname(hostname, ip_addr, sizeof(ip_addr)))
475 return strdup(ip_addr);