2 net_socket.c -- Handle various kinds of sockets.
3 Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl>,
4 2000-2002 Guus Sliepen <guus@sliepen.eu.org>
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 1.1.2.19 2002/09/09 19:39:59 guus Exp $
28 #include <netinet/in.h>
29 #ifdef HAVE_NETINET_IN_SYSTM_H
30 #include <netinet/in_systm.h>
32 #ifdef HAVE_NETINET_IP_H
33 #include <netinet/ip.h>
35 #ifdef HAVE_NETINET_TCP_H
36 #include <netinet/tcp.h>
43 #include <sys/types.h>
46 #include <sys/ioctl.h>
47 /* SunOS really wants sys/socket.h BEFORE net/if.h,
48 and FreeBSD wants these lines below the rest. */
49 #include <arpa/inet.h>
50 #include <sys/socket.h>
59 #include "connection.h"
74 #ifndef HAVE_RAND_PSEUDO_BYTES
75 #define RAND_pseudo_bytes RAND_bytes
78 int addressfamily = AF_INET;
80 int seconds_till_retry = 5;
82 listen_socket_t listen_socket[MAXSOCKETS];
87 int setup_listen_socket(sockaddr_t *sa)
92 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
97 nfd = socket(sa->sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
101 syslog(LOG_ERR, _("Creating metasocket failed: %s"), strerror(errno));
105 flags = fcntl(nfd, F_GETFL);
106 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
109 syslog(LOG_ERR, _("System call `%s' failed: %s"), "fcntl", strerror(errno));
113 /* Optimize TCP settings */
116 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
118 #if defined(SOL_TCP) && defined(TCP_NODELAY)
119 setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
122 #if defined(SOL_IP) && defined(IP_TOS) && defined(IPTOS_LOWDELAY)
123 option = IPTOS_LOWDELAY;
124 setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option));
127 if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface))
129 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
130 memset(&ifr, 0, sizeof(ifr));
131 strncpy(ifr.ifr_ifrn.ifrn_name, interface, IFNAMSIZ);
132 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)))
135 syslog(LOG_ERR, _("Can't bind to interface %s: %s"), interface, strerror(errno));
139 syslog(LOG_WARNING, _("BindToDevice not supported on this platform"));
143 if(bind(nfd, &sa->sa, SALEN(sa->sa)))
146 addrstr = sockaddr2hostname(sa);
147 syslog(LOG_ERR, _("Can't bind to %s/tcp: %s"), addrstr, strerror(errno));
155 syslog(LOG_ERR, _("System call `%s' failed: %s"), "listen", strerror(errno));
162 int setup_vpn_in_socket(sockaddr_t *sa)
167 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
172 nfd = socket(sa->sa.sa_family, SOCK_DGRAM, IPPROTO_UDP);
176 syslog(LOG_ERR, _("Creating UDP socket failed: %s"), strerror(errno));
180 flags = fcntl(nfd, F_GETFL);
181 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
184 syslog(LOG_ERR, _("System call `%s' failed: %s"), "fcntl", strerror(errno));
189 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
191 #if defined(SOL_SOCKET) && defined(SO_BINDTODEVICE)
192 if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface))
194 memset(&ifr, 0, sizeof(ifr));
195 strncpy(ifr.ifr_ifrn.ifrn_name, interface, IFNAMSIZ);
196 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)))
199 syslog(LOG_ERR, _("Can't bind to interface %s: %s"), interface, strerror(errno));
205 if(bind(nfd, &sa->sa, SALEN(sa->sa)))
208 addrstr = sockaddr2hostname(sa);
209 syslog(LOG_ERR, _("Can't bind to %s/udp: %s"), addrstr, strerror(errno));
217 void retry_outgoing(outgoing_t *outgoing)
221 outgoing->timeout += 5;
222 if(outgoing->timeout > maxtimeout)
223 outgoing->timeout = maxtimeout;
226 event->handler = (event_handler_t)setup_outgoing_connection;
227 event->time = now + outgoing->timeout;
228 event->data = outgoing;
231 if(debug_lvl >= DEBUG_CONNECTIONS)
232 syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), outgoing->timeout);
236 int setup_outgoing_socket(connection_t *c)
240 if(debug_lvl >= DEBUG_CONNECTIONS)
241 syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname);
243 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
247 syslog(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname, strerror(errno));
251 /* Optimize TCP settings */
253 #if defined(SOL_TCP) && defined(TCP_NODELAY)
255 setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
258 #if defined(SOL_IP) && defined(IP_TOS)
259 option = IPTOS_LOWDELAY;
260 setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
265 if(connect(c->socket, &c->address.sa, SALEN(c->address.sa)) == -1)
268 syslog(LOG_ERR, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(errno));
272 if(debug_lvl >= DEBUG_CONNECTIONS)
273 syslog(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname);
279 void finish_connecting(connection_t *c)
282 if(debug_lvl >= DEBUG_CONNECTIONS)
283 syslog(LOG_INFO, _("Connected to %s (%s)"), c->name, c->hostname);
285 c->last_ping_time = now;
291 void do_outgoing_connection(connection_t *c)
293 char *address, *port;
294 int option, result, flags;
299 if(!c->outgoing->cfg)
301 if(debug_lvl >= DEBUG_CONNECTIONS)
302 syslog(LOG_ERR, _("Could not set up a meta connection to %s"), c->name);
303 c->status.remove = 1;
304 retry_outgoing(c->outgoing);
308 get_config_string(c->outgoing->cfg, &address);
310 if(!get_config_string(lookup_config(c->config_tree, "Port"), &port))
311 asprintf(&port, "655");
313 c->outgoing->ai = str2addrinfo(address, port, SOCK_STREAM);
317 c->outgoing->aip = c->outgoing->ai;
318 c->outgoing->cfg = lookup_config_next(c->config_tree, c->outgoing->cfg);
321 if(!c->outgoing->aip)
323 freeaddrinfo(c->outgoing->ai);
324 c->outgoing->ai = NULL;
328 memcpy(&c->address, c->outgoing->aip->ai_addr, c->outgoing->aip->ai_addrlen);
329 c->outgoing->aip = c->outgoing->aip->ai_next;
334 c->hostname = sockaddr2hostname(&c->address);
336 if(debug_lvl >= DEBUG_CONNECTIONS)
337 syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname);
339 c->socket = socket(c->address.sa.sa_family, SOCK_STREAM, IPPROTO_TCP);
343 if(debug_lvl >= DEBUG_CONNECTIONS)
344 syslog(LOG_ERR, _("Creating socket for %s failed: %s"), c->hostname, strerror(errno));
349 /* Optimize TCP settings */
351 #if defined(SOL_TCP) && defined(TCP_NODELAY)
353 setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
356 #if defined(SOL_IP) && defined(IP_TOS)
357 option = IPTOS_LOWDELAY;
358 setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
363 flags = fcntl(c->socket, F_GETFL);
365 if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0)
367 syslog(LOG_ERR, _("fcntl for %s: %s"), c->hostname, strerror(errno));
372 result = connect(c->socket, &c->address.sa, SALEN(c->address.sa));
376 if(errno == EINPROGRESS)
378 c->status.connecting = 1;
384 if(debug_lvl >= DEBUG_CONNECTIONS)
385 syslog(LOG_ERR, _("%s: %s"), c->hostname, strerror(errno));
390 finish_connecting(c);
395 void setup_outgoing_connection(outgoing_t *outgoing)
400 n = lookup_node(outgoing->name);
405 if(debug_lvl >= DEBUG_CONNECTIONS)
406 syslog(LOG_INFO, _("Already connected to %s"), outgoing->name);
407 n->connection->outgoing = outgoing;
411 c = new_connection();
412 c->name = xstrdup(outgoing->name);
413 c->outcipher = myself->connection->outcipher;
414 c->outdigest = myself->connection->outdigest;
415 c->outmaclength = myself->connection->outmaclength;
416 c->outcompression = myself->connection->outcompression;
418 init_configuration(&c->config_tree);
419 read_connection_config(c);
421 outgoing->cfg = lookup_config(c->config_tree, "Address");
425 syslog(LOG_ERR, _("No address specified for %s"), c->name);
427 free(outgoing->name);
432 c->outgoing = outgoing;
433 c->last_ping_time = now;
437 do_outgoing_connection(c);
441 accept a new tcp connect and create a
444 int handle_new_meta_connection(int sock)
448 int fd, len = sizeof(sa);
450 fd = accept(sock, &sa.sa, &len);
454 syslog(LOG_ERR, _("Accepting a new connection failed: %s"), strerror(errno));
460 c = new_connection();
461 c->outcipher = myself->connection->outcipher;
462 c->outdigest = myself->connection->outdigest;
463 c->outmaclength = myself->connection->outmaclength;
464 c->outcompression = myself->connection->outcompression;
467 c->hostname = sockaddr2hostname(&sa);
469 c->last_ping_time = now;
471 if(debug_lvl >= DEBUG_CONNECTIONS)
472 syslog(LOG_NOTICE, _("Connection from %s"), c->hostname);
476 c->allow_request = ID;
482 void try_outgoing_connections(void)
484 static config_t *cfg = NULL;
486 outgoing_t *outgoing;
488 for(cfg = lookup_config(config_tree, "ConnectTo"); cfg; cfg = lookup_config_next(config_tree, cfg))
490 get_config_string(cfg, &name);
494 syslog(LOG_ERR, _("Invalid name for outgoing connection in %s line %d"), cfg->file, cfg->line);
499 outgoing = xmalloc_and_zero(sizeof(*outgoing));
500 outgoing->name = name;
501 setup_outgoing_connection(outgoing);