2 net_socket.c -- Handle various kinds of sockets.
3 Copyright (C) 1998-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
4 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 $Id: net_socket.c,v 1.1.2.8 2002/03/01 15:14:29 guus Exp $
28 #include <netinet/in.h>
30 #include <netinet/ip.h>
31 #include <netinet/tcp.h>
38 #include <sys/types.h>
41 #include <sys/ioctl.h>
42 /* SunOS really wants sys/socket.h BEFORE net/if.h,
43 and FreeBSD wants these lines below the rest. */
44 #include <arpa/inet.h>
45 #include <sys/socket.h>
54 #include "connection.h"
69 int addressfamily = AF_INET;
71 int seconds_till_retry = 5;
73 int tcp_socket[MAXSOCKETS];
74 int udp_socket[MAXSOCKETS];
75 int listen_sockets = 0;
79 int setup_listen_socket(sockaddr_t *sa)
84 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
89 if((nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP)) < 0)
91 syslog(LOG_ERR, _("Creating metasocket failed: %s"), strerror(errno));
95 flags = fcntl(nfd, F_GETFL);
96 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
99 syslog(LOG_ERR, _("System call `%s' failed: %s"), "fcntl", strerror(errno));
103 /* Optimize TCP settings */
106 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
108 #if defined(SOL_TCP) && defined(TCP_NODELAY)
109 setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
112 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
113 option = IPTOS_LOWDELAY;
114 setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option));
117 if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface))
119 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
120 memset(&ifr, 0, sizeof(ifr));
121 strncpy(ifr.ifr_ifrn.ifrn_name, interface, IFNAMSIZ);
122 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)))
125 syslog(LOG_ERR, _("Can't bind to interface %s: %s"), interface, strerror(errno));
129 syslog(LOG_WARNING, _("BindToDevice not supported on this platform"));
133 if(bind(nfd, &sa->sa, SALEN(sa->sa)))
136 addrstr = sockaddr2hostname(sa);
137 syslog(LOG_ERR, _("Can't bind to %s/tcp: %s"), addrstr, strerror(errno));
145 syslog(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno));
152 int setup_vpn_in_socket(sockaddr_t *sa)
157 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
162 if((nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP)) < 0)
164 syslog(LOG_ERR, _("Creating UDP socket failed: %s"), strerror(errno));
168 flags = fcntl(nfd, F_GETFL);
169 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
172 syslog(LOG_ERR, _("System call `%s' failed: %s"), "fcntl", strerror(errno));
177 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
179 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
180 if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface))
182 memset(&ifr, 0, sizeof(ifr));
183 strncpy(ifr.ifr_ifrn.ifrn_name, interface, IFNAMSIZ);
184 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)))
187 syslog(LOG_ERR, _("Can't bind to interface %s: %s"), interface, strerror(errno));
193 if(bind(nfd, &sa->sa, SALEN(sa->sa)))
196 addrstr = sockaddr2hostname(sa);
197 syslog(LOG_ERR, _("Can't bind to %s/udp: %s"), addrstr, strerror(errno));
205 void retry_outgoing(outgoing_t *outgoing)
209 outgoing->timeout += 5;
210 if(outgoing->timeout > maxtimeout)
211 outgoing->timeout = maxtimeout;
214 event->handler = (event_handler_t)setup_outgoing_connection;
215 event->time = now + outgoing->timeout;
216 event->data = outgoing;
219 if(debug_lvl >= DEBUG_CONNECTIONS)
220 syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), outgoing->timeout);
224 int setup_outgoing_socket(connection_t *c)
228 if(debug_lvl >= DEBUG_CONNECTIONS)
229 syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname);
231 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
235 syslog(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname, strerror(errno));
239 /* Optimize TCP settings */
243 setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
245 option = IPTOS_LOWDELAY;
246 setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
251 if(connect(c->socket, &c->address.sa, SALEN(c->address.sa)) == -1)
254 syslog(LOG_ERR, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(errno));
258 if(debug_lvl >= DEBUG_CONNECTIONS)
259 syslog(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname);
265 void finish_connecting(connection_t *c)
268 if(debug_lvl >= DEBUG_CONNECTIONS)
269 syslog(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname);
271 c->last_ping_time = now;
277 void do_outgoing_connection(connection_t *c)
279 char *address, *port;
280 int option, result, flags;
285 if(!c->outgoing->cfg)
287 if(debug_lvl >= DEBUG_CONNECTIONS)
288 syslog(LOG_ERR, _("Could not set up a meta connection to %s"), c->name);
289 c->status.remove = 1;
291 retry_outgoing(c->outgoing);
295 get_config_string(c->outgoing->cfg, &address);
297 if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
298 asprintf(&port, "655");
300 c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
304 c->outgoing->aip = c->outgoing->ai;
305 c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
308 if(!c->outgoing->aip)
310 freeaddrinfo(c->outgoing->ai);
311 c->outgoing->ai = NULL;
315 memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
316 c->outgoing->aip = c->outgoing->aip->ai_next;
321 c->hostname = sockaddr2hostname(&c->address);
323 if(debug_lvl >= DEBUG_CONNECTIONS)
324 syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname);
326 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
330 if(debug_lvl >= DEBUG_CONNECTIONS)
331 syslog(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname, strerror(errno));
336 /* Optimize TCP settings */
340 setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
342 option = IPTOS_LOWDELAY;
343 setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
348 flags = fcntl(c->socket, F_GETFL);
350 if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0)
352 syslog(LOG_ERR, _("fcntl for %s: %s"), c->hostname, strerror(errno));
357 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
361 if(errno == EINPROGRESS)
363 c->status.connecting = 1;
369 if(debug_lvl >= DEBUG_CONNECTIONS)
370 syslog(LOG_ERR, _("%s: %s"), c->hostname, strerror(errno));
375 finish_connecting(c);
380 void setup_outgoing_connection(outgoing_t *outgoing)
385 n = lookup_node(outgoing->name);
390 if(debug_lvl >= DEBUG_CONNECTIONS)
391 syslog(LOG_INFO, _("Already connected to %s"), outgoing->name);
392 n->connection->outgoing = outgoing;
396 c = new_connection();
397 c->name = xstrdup(outgoing->name);
398 c->outcipher = myself->connection->outcipher;
399 c->outdigest = myself->connection->outdigest;
400 c->outmaclength = myself->connection->outmaclength;
401 c->outcompression = myself->connection->outcompression;
403 init_configuration(&c->config_tree);
404 read_connection_config(c);
406 outgoing->cfg = lookup_config(c->config_tree, "Address");
410 syslog(LOG_ERR, _("No address specified for %s"), c->name);
412 free(outgoing->name);
417 c->outgoing = outgoing;
418 c->last_ping_time = now;
422 do_outgoing_connection(c);
426 accept a new tcp connect and create a
429 int handle_new_meta_connection(int sock)
433 int fd, len = sizeof(sa);
435 if((fd = accept(sock, &sa.sa, &len)) < 0)
437 syslog(LOG_ERR, _("Accepting a new connection failed: %s"), strerror(errno));
441 c = new_connection();
442 c->outcipher = myself->connection->outcipher;
443 c->outdigest = myself->connection->outdigest;
444 c->outmaclength = myself->connection->outmaclength;
445 c->outcompression = myself->connection->outcompression;
448 c->hostname = sockaddr2hostname(&sa);
450 c->last_ping_time = now;
452 if(debug_lvl >= DEBUG_CONNECTIONS)
453 syslog(LOG_NOTICE, _("Connection from %s"), c->hostname);
457 c->allow_request = ID;
463 void try_outgoing_connections(void)
465 static config_t *cfg = NULL;
467 outgoing_t *outgoing;
469 for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg))
471 get_config_string(cfg, &name);
475 syslog(LOG_ERR, _("Invalid name for outgoing connection in %s line %d"), cfg->file, cfg->line);
480 outgoing = xmalloc_and_zero(sizeof(*outgoing));
481 outgoing->name = name;
482 setup_outgoing_connection(outgoing);