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;
151 char hbuf[NI_MAXHOST];
153 memset(&hints, 0, sizeof(hints));
154 hints.ai_socktype = SOCK_STREAM;
155 if (getaddrinfo(name, NULL, &hints, &ai))
158 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, hbuf,
159 sizeof(hbuf), NULL, 0, NI_NUMERICHOST))
162 if (ai->ai_family == AF_INET) {
163 if (!inet_ntop(ai->ai_family,
164 &((struct sockaddr_in *)ai->ai_addr)->sin_addr,
165 address, address_len))
168 if (!inet_ntop(ai->ai_family,
169 &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr,
170 address, address_len))
180 hp = gethostbyname(name);
184 memcpy(&ip.s_addr, hp->h_addr_list[0], 4);
188 if (address_len < strlen(tmp))
190 memset(address, 0, address_len);
191 strncpy(address, tmp, strlen(tmp));
197 /* Resolves IP address for hostname async. */
199 void silc_net_gethostbyname_async(const char *name,
200 SilcSchedule schedule,
201 SilcNetResolveCallback completion,
204 SilcNetResolveContext r = silc_calloc(1, sizeof(*r));
206 r->completion = completion;
207 r->context = context;
208 r->schedule = schedule;
209 r->input = strdup(name);
211 silc_thread_create(silc_net_gethostbyname_thread, r, FALSE);
214 /* Resolves hostname by IP address. */
216 bool silc_net_gethostbyaddr(const char *addr, char *name, uint32 name_len)
219 struct addrinfo req, *ai;
221 memset(&req, 0, sizeof(req));
222 req.ai_socktype = SOCK_STREAM;
223 req.ai_flags = AI_CANONNAME;
225 if (getaddrinfo(addr, NULL, &req, &ai))
227 if (name_len < strlen(ai->ai_canonname))
229 memset(name, 0, name_len);
230 strncpy(name, ai->ai_canonname, strlen(ai->ai_canonname));
236 hp = gethostbyaddr(addr, strlen(addr), AF_INET);
239 if (name_len < strlen(hp->h_name))
241 memset(name, 0, name_len);
242 strncpy(name, hp->h_name, strlen(hp->h_name));
248 /* Resolves hostname by IP address async. */
250 void silc_net_gethostbyaddr_async(const char *addr,
251 SilcSchedule schedule,
252 SilcNetResolveCallback completion,
255 SilcNetResolveContext r = silc_calloc(1, sizeof(*r));
257 r->completion = completion;
258 r->context = context;
259 r->schedule = schedule;
260 r->input = strdup(addr);
262 silc_thread_create(silc_net_gethostbyaddr_thread, r, FALSE);
265 /* Performs lookups for remote name and IP address. This peforms reverse
266 lookup as well to verify that the IP has FQDN. */
268 bool silc_net_check_host_by_sock(int sock, char **hostname, char **ip)
270 struct sockaddr_in remote;
271 struct hostent *dest;
272 char *host_ip = NULL;
273 char host_name[1024];
280 SILC_LOG_DEBUG(("Resolving remote hostname and IP address"));
282 memset(&remote, 0, sizeof(remote));
283 len = sizeof(remote);
284 rval = getpeername(sock, (struct sockaddr *)&remote, &len);
288 host_ip = inet_ntoa(remote.sin_addr);
292 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
293 memcpy(*ip, host_ip, strlen(host_ip));
295 /* Get host by address */
296 dest = gethostbyaddr((char *)&remote.sin_addr,
297 sizeof(struct in_addr), AF_INET);
301 /* Get same host by name to see that the remote host really is
302 the who it says it is */
303 memset(host_name, 0, sizeof(host_name));
304 memcpy(host_name, dest->h_name, strlen(dest->h_name));
306 *hostname = silc_calloc(strlen(host_name) + 1, sizeof(char));
307 memcpy(*hostname, host_name, strlen(host_name));
308 SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
310 dest = gethostbyname(host_name);
314 /* Find the address from list */
315 for (i = 0; dest->h_addr_list[i]; i++)
316 if (!memcmp(dest->h_addr_list[i], &remote.sin_addr,
317 sizeof(struct in_addr)))
319 if (!dest->h_addr_list[i])
323 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
324 memcpy(*ip, host_ip, strlen(host_ip));
325 SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
330 /* Performs lookups for local name and IP address. This peforms reverse
331 lookup as well to verify that the IP has FQDN. */
333 bool silc_net_check_local_by_sock(int sock, char **hostname, char **ip)
335 struct sockaddr_in local;
336 struct hostent *dest;
337 char *host_ip = NULL;
338 char host_name[1024];
345 SILC_LOG_DEBUG(("Resolving local hostname and IP address"));
347 memset(&local, 0, sizeof(local));
349 rval = getsockname(sock, (struct sockaddr *)&local, &len);
353 host_ip = inet_ntoa(local.sin_addr);
357 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
358 memcpy(*ip, host_ip, strlen(host_ip));
360 /* Get host by address */
361 dest = gethostbyaddr((char *)&local.sin_addr,
362 sizeof(struct in_addr), AF_INET);
366 /* Get same host by name to see that the local host really is
367 the who it says it is */
368 memset(host_name, 0, sizeof(host_name));
369 memcpy(host_name, dest->h_name, strlen(dest->h_name));
371 *hostname = silc_calloc(strlen(host_name) + 1, sizeof(char));
372 memcpy(*hostname, host_name, strlen(host_name));
373 SILC_LOG_DEBUG(("Resolved hostname `%s'", *hostname));
375 dest = gethostbyname(host_name);
379 /* Find the address from list */
380 for (i = 0; dest->h_addr_list[i]; i++)
381 if (!memcmp(dest->h_addr_list[i], &local.sin_addr,
382 sizeof(struct in_addr)))
384 if (!dest->h_addr_list[i])
388 *ip = silc_calloc(strlen(host_ip) + 1, sizeof(char));
389 memcpy(*ip, host_ip, strlen(host_ip));
390 SILC_LOG_DEBUG(("Resolved IP address `%s'", *ip));
395 /* Return remote port by socket. */
397 uint16 silc_net_get_remote_port(int sock)
399 struct sockaddr_in remote;
402 memset(&remote, 0, sizeof(remote));
403 len = sizeof(remote);
404 if (getpeername(sock, (struct sockaddr *)&remote, &len) < 0)
407 return ntohs(remote.sin_port);
410 /* Return local port by socket. */
412 uint16 silc_net_get_local_port(int sock)
414 struct sockaddr_in local;
417 memset(&local, 0, sizeof(local));
419 if (getsockname(sock, (struct sockaddr *)&local, &len) < 0)
422 return ntohs(local.sin_port);
425 /* Return name of localhost. */
427 char *silc_net_localhost(void)
429 char hostname[256], ip_addr[64];
431 if (gethostname(hostname, sizeof(hostname)))
434 if (!silc_net_gethostbyname(hostname, ip_addr, sizeof(ip_addr)))
435 return strdup(hostname);
437 silc_net_gethostbyaddr(ip_addr, hostname, sizeof(hostname));
438 return strdup(hostname);
441 /* Returns local IP address */
443 char *silc_net_localip(void)
445 char hostname[256], ip_addr[64];
447 if (gethostname(hostname, sizeof(hostname)))
450 if (!silc_net_gethostbyname(hostname, ip_addr, sizeof(ip_addr)))
453 return strdup(ip_addr);