2 net.c -- most of the network code
3 Copyright (C) 1998-2001 Ivo Timmermans <itimmermans@bigfoot.com>,
4 2000,2001 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.c,v 1.35.4.142 2001/10/30 12:59:12 guus Exp $
28 #include <netinet/in.h>
30 #include <netinet/ip.h>
31 #include <netinet/tcp.h>
36 #include <sys/signal.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>
48 #include <openssl/rand.h>
49 #include <openssl/evp.h>
50 #include <openssl/pem.h>
52 #ifndef HAVE_RAND_PSEUDO_BYTES
53 #define RAND_pseudo_bytes RAND_bytes
62 #include "connection.h"
76 int seconds_till_retry = 5;
86 void receive_udppacket(node_t *n, vpn_packet_t *inpkt)
92 /* Decrypt the packet */
94 EVP_DecryptInit(&ctx, myself->cipher, myself->key, myself->key + myself->cipher->key_len);
95 EVP_DecryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len);
96 EVP_DecryptFinal(&ctx, outpkt.salt + outlen, &outpad);
98 outpkt.len = outlen - sizeof(outpkt.salt);
100 receive_packet(n, &outpkt);
104 void receive_tcppacket(connection_t *c, char *buffer, int len)
109 memcpy(outpkt.data, buffer, len);
111 receive_packet(c->node, &outpkt);
115 void receive_packet(node_t *n, vpn_packet_t *packet)
118 if(debug_lvl >= DEBUG_TRAFFIC)
119 syslog(LOG_DEBUG, _("Received packet of %d bytes from %s (%s)"), packet->len, n->name, n->hostname);
121 route_incoming(n, packet);
125 void send_udppacket(node_t *n, vpn_packet_t *inpkt)
130 struct sockaddr_in to;
131 socklen_t tolen = sizeof(to);
134 if(!n->status.validkey)
136 if(debug_lvl >= DEBUG_TRAFFIC)
137 syslog(LOG_INFO, _("No valid key known yet for %s (%s), queueing packet"),
138 n->name, n->hostname);
140 /* Since packet is on the stack of handle_tap_input(),
141 we have to make a copy of it first. */
143 copy = xmalloc(sizeof(vpn_packet_t));
144 memcpy(copy, inpkt, sizeof(vpn_packet_t));
146 list_insert_tail(n->queue, copy);
148 if(!n->status.waitingforkey)
149 send_req_key(n->nexthop->connection, myself, n);
153 /* Encrypt the packet. */
155 RAND_pseudo_bytes(inpkt->salt, sizeof(inpkt->salt));
157 EVP_EncryptInit(&ctx, n->cipher, n->key, n->key + n->cipher->key_len);
158 EVP_EncryptUpdate(&ctx, outpkt.salt, &outlen, inpkt->salt, inpkt->len + sizeof(inpkt->salt));
159 EVP_EncryptFinal(&ctx, outpkt.salt + outlen, &outpad);
162 to.sin_family = AF_INET;
163 to.sin_addr.s_addr = htonl(n->address);
164 to.sin_port = htons(n->port);
166 if((sendto(udp_socket, (char *) outpkt.salt, outlen, 0, (const struct sockaddr *)&to, tolen)) < 0)
168 syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"),
169 n->name, n->hostname);
176 send a packet to the given vpn ip.
178 void send_packet(node_t *n, vpn_packet_t *packet)
181 if(debug_lvl >= DEBUG_TRAFFIC)
182 syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
183 packet->len, n->name, n->hostname);
187 if(debug_lvl >= DEBUG_TRAFFIC)
189 syslog(LOG_NOTICE, _("Packet is looping back to us!"));
195 if(n->via != n && debug_lvl >= DEBUG_TRAFFIC)
196 syslog(LOG_ERR, _("Sending packet to %s via %s (%s)"),
197 n->name, n->via->name, n->via->hostname);
199 if((myself->options | n->via->options) & OPTION_TCPONLY)
201 if(send_tcppacket(n->via->connection, packet))
202 terminate_connection(n->via->connection, 1);
205 send_udppacket(n->via, packet);
208 /* Broadcast a packet to all active direct connections */
210 void broadcast_packet(node_t *from, vpn_packet_t *packet)
215 if(debug_lvl >= DEBUG_TRAFFIC)
216 syslog(LOG_INFO, _("Broadcasting packet of %d bytes from %s (%s)"),
217 packet->len, from->name, from->hostname);
219 for(node = connection_tree->head; node; node = node->next)
221 c = (connection_t *)node->data;
222 if(c->status.active && c != from->nexthop->connection)
223 send_packet(c->node, packet);
228 void flush_queue(node_t *n)
230 list_node_t *node, *next;
232 if(debug_lvl >= DEBUG_TRAFFIC)
233 syslog(LOG_INFO, _("Flushing queue for %s (%s)"), n->name, n->hostname);
235 for(node = n->queue->head; node; node = next)
238 send_udppacket(n, (vpn_packet_t *)node->data);
239 list_delete_node(n->queue, node);
246 int setup_listen_socket(int port)
249 struct sockaddr_in a;
255 if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
257 syslog(LOG_ERR, _("Creating metasocket failed: %m"));
261 flags = fcntl(nfd, F_GETFL);
262 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
265 syslog(LOG_ERR, _("System call `%s' failed: %m"),
270 /* Optimize TCP settings */
273 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &option, sizeof(option));
274 setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option));
276 setsockopt(nfd, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
278 option = IPTOS_LOWDELAY;
279 setsockopt(nfd, SOL_IP, IP_TOS, &option, sizeof(option));
281 if(get_config_string(lookup_config(config_tree, "BindToInterface"), &interface))
282 if(setsockopt(nfd, SOL_SOCKET, SO_BINDTODEVICE, interface, strlen(interface)))
285 syslog(LOG_ERR, _("Can't bind to interface %s: %m"), interface);
290 memset(&a, 0, sizeof(a));
291 a.sin_family = AF_INET;
292 a.sin_addr.s_addr = htonl(INADDR_ANY);
293 a.sin_port = htons(port);
295 if(get_config_string(lookup_config(config_tree, "BindToAddress"), &address))
297 ipmask = strtoip(address);
300 a.sin_addr.s_addr = htonl(ipmask->address);
305 if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
308 syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port);
315 syslog(LOG_ERR, _("System call `%s' failed: %m"),
323 int setup_vpn_in_socket(int port)
326 struct sockaddr_in a;
329 if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
332 syslog(LOG_ERR, _("Creating socket failed: %m"));
336 setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one));
338 flags = fcntl(nfd, F_GETFL);
339 if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
342 syslog(LOG_ERR, _("System call `%s' failed: %m"),
347 memset(&a, 0, sizeof(a));
348 a.sin_family = AF_INET;
349 a.sin_port = htons(port);
350 a.sin_addr.s_addr = htonl(INADDR_ANY);
352 if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
355 syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port);
362 int setup_outgoing_socket(connection_t *c)
365 struct sockaddr_in a;
368 if(debug_lvl >= DEBUG_CONNECTIONS)
369 syslog(LOG_INFO, _("Trying to connect to %s (%s)"), c->name, c->hostname);
371 c->socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
375 syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"),
376 c->hostname, c->port);
380 /* Bind first to get a fix on our source port???
382 a.sin_family = AF_INET;
383 a.sin_port = htons(0);
384 a.sin_addr.s_addr = htonl(INADDR_ANY);
386 if(bind(c->socket, (struct sockaddr *)&a, sizeof(struct sockaddr)))
389 syslog(LOG_ERR, _("System call `%s' failed: %m"), "bind");
395 /* Optimize TCP settings?
398 setsockopt(c->socket, SOL_SOCKET, SO_KEEPALIVE, &option, sizeof(option));
400 setsockopt(c->socket, SOL_TCP, TCP_NODELAY, &option, sizeof(option));
402 option = IPTOS_LOWDELAY;
403 setsockopt(c->socket, SOL_IP, IP_TOS, &option, sizeof(option));
410 a.sin_family = AF_INET;
411 a.sin_port = htons(c->port);
412 a.sin_addr.s_addr = htonl(c->address);
414 if(connect(c->socket, (struct sockaddr *)&a, sizeof(a)) == -1)
417 syslog(LOG_ERR, _("%s port %hd: %m"), c->hostname, c->port);
421 flags = fcntl(c->socket, F_GETFL);
423 if(fcntl(c->socket, F_SETFL, flags | O_NONBLOCK) < 0)
426 syslog(LOG_ERR, _("fcntl for %s port %d: %m"),
427 c->hostname, c->port);
431 if(debug_lvl >= DEBUG_CONNECTIONS)
432 syslog(LOG_INFO, _("Connected to %s port %hd"),
433 c->hostname, c->port);
438 int setup_outgoing_connection(char *name)
443 c = new_connection();
444 c->name = xstrdup(name);
446 init_configuration(&c->config_tree);
447 read_connection_config(c);
449 if(!get_config_string(lookup_config(c->config_tree, "Address"), &c->hostname))
451 syslog(LOG_ERR, _("No address specified for %s"), c->name);
456 if(!get_config_port(lookup_config(c->config_tree, "Port"), &c->port))
458 syslog(LOG_ERR, _("No port specified for %s"), c->name);
463 if(!(h = gethostbyname(c->hostname)))
465 syslog(LOG_ERR, _("Error looking up `%s': %m"), c->hostname);
470 c->address = ntohl(*((ipv4_t*)(h->h_addr_list[0])));
471 c->hostname = hostlookup(htonl(c->address));
473 if(setup_outgoing_socket(c) < 0)
475 syslog(LOG_ERR, _("Could not set up a meta connection to %s (%s)"),
476 c->name, c->hostname);
481 c->status.outgoing = 1;
482 c->last_ping_time = time(NULL);
491 int read_rsa_public_key(connection_t *c)
499 c->rsa_key = RSA_new();
501 /* First, check for simple PublicKey statement */
503 if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key))
505 BN_hex2bn(&c->rsa_key->n, key);
506 BN_hex2bn(&c->rsa_key->e, "FFFF");
510 /* Else, check for PublicKeyFile statement and read it */
512 if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname))
514 if(is_safe_path(fname))
516 if((fp = fopen(fname, "r")) == NULL)
518 syslog(LOG_ERR, _("Error reading RSA public key file `%s': %m"),
522 result = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
526 syslog(LOG_ERR, _("Reading RSA public key file `%s' failed: %m"),
536 /* Else, check if a harnessed public key is in the config file */
540 asprintf(&fname, "%s/hosts/%s", confbase, c->name);
541 if((fp = fopen(fname, "r")))
543 result = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL);
554 syslog(LOG_ERR, _("No public key for %s specified!"), c->name);
559 int read_rsa_private_key(void)
565 if(!myself->connection->rsa_key)
566 myself->connection->rsa_key = RSA_new();
568 if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key))
570 BN_hex2bn(&myself->connection->rsa_key->d, key);
571 BN_hex2bn(&myself->connection->rsa_key->e, "FFFF");
573 else if(get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname))
575 if((fp = fopen(fname, "r")) == NULL)
577 syslog(LOG_ERR, _("Error reading RSA private key file `%s': %m"),
581 result = PEM_read_RSAPrivateKey(fp, &myself->connection->rsa_key, NULL, NULL);
585 syslog(LOG_ERR, _("Reading RSA private key file `%s' failed: %m"),
592 syslog(LOG_ERR, _("No private key for tinc daemon specified!"));
600 Configure node_t myself and set up the local sockets (listen only)
602 int setup_myself(void)
610 myself->connection = new_connection();
611 init_configuration(&myself->connection->config_tree);
613 asprintf(&myself->hostname, _("MYSELF"));
614 asprintf(&myself->connection->hostname, _("MYSELF"));
616 myself->connection->options = 0;
617 myself->connection->protocol_version = PROT_CURRENT;
619 if(!get_config_string(lookup_config(config_tree, "Name"), &name)) /* Not acceptable */
621 syslog(LOG_ERR, _("Name for tinc daemon required!"));
627 syslog(LOG_ERR, _("Invalid name for myself!"));
633 myself->connection->name = xstrdup(name);
636 if(read_rsa_private_key())
639 if(read_connection_config(myself->connection))
641 syslog(LOG_ERR, _("Cannot open host configuration file for myself!"));
645 if(read_rsa_public_key(myself->connection))
650 if(RSA_check_key(rsa_key) != 1)
652 syslog(LOG_ERR, _("Invalid public/private keypair!"));
656 if(!get_config_port(lookup_config(myself->connection->config_tree, "Port"), &myself->port))
659 myself->connection->port = myself->port;
661 /* Read in all the subnets specified in the host configuration file */
663 cfg = lookup_config(myself->connection->config_tree, "Subnet");
667 if(!get_config_subnet(cfg, &subnet))
670 subnet_add(myself, subnet);
672 cfg = lookup_config_next(myself->connection->config_tree, cfg);
676 /* Check some options */
678 if(get_config_bool(lookup_config(config_tree, "IndirectData"), &choice))
680 myself->options |= OPTION_INDIRECT;
682 if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice))
684 myself->options |= OPTION_TCPONLY;
686 if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice))
688 myself->options |= OPTION_INDIRECT;
690 if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice))
692 myself->options |= OPTION_TCPONLY;
694 if(myself->options & OPTION_TCPONLY)
695 myself->options |= OPTION_INDIRECT;
697 if(get_config_string(lookup_config(config_tree, "Mode"), &mode))
699 if(!strcasecmp(mode, "router"))
700 routing_mode = RMODE_ROUTER;
701 else if (!strcasecmp(mode, "switch"))
702 routing_mode = RMODE_SWITCH;
703 else if (!strcasecmp(mode, "hub"))
704 routing_mode = RMODE_HUB;
707 syslog(LOG_ERR, _("Invalid routing mode!"));
712 routing_mode = RMODE_ROUTER;
717 if((tcp_socket = setup_listen_socket(myself->port)) < 0)
719 syslog(LOG_ERR, _("Unable to set up a listening TCP socket!"));
723 if((udp_socket = setup_vpn_in_socket(myself->port)) < 0)
725 syslog(LOG_ERR, _("Unable to set up a listening UDP socket!"));
729 /* Generate packet encryption key */
731 myself->cipher = EVP_bf_cbc();
733 myself->keylength = myself->cipher->key_len + myself->cipher->iv_len;
735 myself->key = (char *)xmalloc(myself->keylength);
736 RAND_pseudo_bytes(myself->key, myself->keylength);
738 if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime))
741 keyexpires = time(NULL) + keylifetime;
745 myself->nexthop = myself;
746 myself->via = myself;
747 myself->status.active = 1;
750 syslog(LOG_NOTICE, _("Ready: listening on port %hd"), myself->port);
756 setup all initial network connections
758 int setup_network_connections(void)
766 if(get_config_int(lookup_config(config_tree, "PingTimeout"), &timeout))
776 if(setup_device() < 0)
779 /* Run tinc-up script to further initialize the tap interface */
780 execute_script("tinc-up");
782 if(setup_myself() < 0)
785 signal(SIGALRM, try_outgoing_connections);
792 close all open network connections
794 void close_network_connections(void)
796 avl_node_t *node, *next;
799 for(node = connection_tree->head; node; node = next)
802 c = (connection_t *)node->data;
803 c->status.outgoing = 0;
804 terminate_connection(c, 0);
807 // terminate_connection(myself, 0);
811 execute_script("tinc-down");
819 handle an incoming tcp connect call and open
822 connection_t *create_new_connection(int sfd)
825 struct sockaddr_in ci;
826 int len = sizeof(ci);
828 c = new_connection();
830 if(getpeername(sfd, (struct sockaddr *) &ci, (socklen_t *) &len) < 0)
832 syslog(LOG_ERR, _("System call `%s' failed: %m"),
838 c->address = ntohl(ci.sin_addr.s_addr);
839 c->hostname = hostlookup(ci.sin_addr.s_addr);
840 c->port = htons(ci.sin_port); /* This one will be overwritten later */
842 c->last_ping_time = time(NULL);
844 if(debug_lvl >= DEBUG_CONNECTIONS)
845 syslog(LOG_NOTICE, _("Connection from %s port %d"),
846 c->hostname, htons(ci.sin_port));
848 c->allow_request = ID;
854 put all file descriptors in an fd_set array
856 void build_fdset(fd_set *fs)
863 for(node = connection_tree->head; node; node = node->next)
865 c = (connection_t *)node->data;
866 FD_SET(c->socket, fs);
869 FD_SET(tcp_socket, fs);
870 FD_SET(udp_socket, fs);
871 FD_SET(device_fd, fs);
876 receive incoming data from the listening
877 udp socket and write it to the ethertap
878 device after being decrypted
880 void handle_incoming_vpn_data(void)
883 int x, l = sizeof(x);
884 struct sockaddr_in from;
885 socklen_t fromlen = sizeof(from);
888 if(getsockopt(udp_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
890 syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"),
891 __FILE__, __LINE__, udp_socket);
896 syslog(LOG_ERR, _("Incoming data socket error: %s"), strerror(x));
900 if((pkt.len = recvfrom(udp_socket, (char *) pkt.salt, MTU, 0, (struct sockaddr *)&from, &fromlen)) <= 0)
902 syslog(LOG_ERR, _("Receiving packet failed: %m"));
906 n = lookup_node_udp(ntohl(from.sin_addr.s_addr), ntohs(from.sin_port));
910 syslog(LOG_WARNING, _("Received UDP packet on port %hd from unknown source %x:%hd"), myself->port, ntohl(from.sin_addr.s_addr), ntohs(from.sin_port));
915 n->connection->last_ping_time = time(NULL);
917 receive_udppacket(n, &pkt);
922 Terminate a connection:
924 - Remove associated hosts and subnets
925 - Deactivate the host
926 - Since it might still be referenced, put it on the prune list.
927 - If report == 1, then send DEL_HOST messages to the other tinc daemons.
929 void terminate_connection(connection_t *c, int report)
931 /* Needs a serious rewrite. */
935 Check if the other end is active.
936 If we have sent packets, but didn't receive any,
937 then possibly the other end is dead. We send a
938 PING request over the meta connection. If the other
939 end does not reply in time, we consider them dead
940 and close the connection.
942 void check_dead_connections(void)
945 avl_node_t *node, *next;
950 for(node = connection_tree->head; node; node = next)
953 c = (connection_t *)node->data;
954 if(c->last_ping_time + timeout < now)
960 if(debug_lvl >= DEBUG_PROTOCOL)
961 syslog(LOG_INFO, _("%s (%s) didn't respond to PING"),
962 c->name, c->hostname);
963 c->status.timeout = 1;
964 terminate_connection(c, 1);
973 if(debug_lvl >= DEBUG_CONNECTIONS)
974 syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"),
975 c->name, c->hostname);
976 terminate_connection(c, 0);
984 accept a new tcp connect and create a
987 int handle_new_meta_connection()
990 struct sockaddr client;
991 int fd, len = sizeof(client);
993 if((fd = accept(tcp_socket, &client, &len)) < 0)
995 syslog(LOG_ERR, _("Accepting a new connection failed: %m"));
999 if(!(new = create_new_connection(fd)))
1003 syslog(LOG_NOTICE, _("Closed attempted connection"));
1007 connection_add(new);
1014 void randomized_alarm(int seconds)
1017 RAND_pseudo_bytes(&r, 1);
1018 alarm((seconds * (int)r) / 128 + 1);
1021 /* This function is severely fucked up.
1022 We want to redesign it so the following rules apply:
1024 - Try all ConnectTo's in a row:
1025 - if a connect() fails, try next one immediately,
1026 - if it works, wait 5 seconds or so.
1027 - If none of them were succesful, increase delay and retry.
1028 - If all were succesful, don't try anymore.
1032 try_outgoing_connections(int a)
1034 static config_t *cfg = NULL;
1035 static int retry = 0;
1039 cfg = lookup_config(config_tree, "ConnectTo");
1046 get_config_string(cfg, &name);
1047 cfg = lookup_config_next(config_tree, cfg); /* Next time skip to next ConnectTo line */
1049 if(setup_outgoing_connection(name)) /* function returns 0 when there are no problems */
1054 get_config_int(lookup_config(config_tree, "MaxTimeout"), &maxtimeout);
1058 seconds_till_retry += 5;
1059 if(seconds_till_retry > maxtimeout) /* Don't wait more than MAXTIMEOUT seconds. */
1060 seconds_till_retry = maxtimeout;
1062 syslog(LOG_ERR, _("Failed to setup all outgoing connections, will retry in %d seconds"),
1063 seconds_till_retry);
1065 /* Randomize timeout to avoid global synchronisation effects */
1066 randomized_alarm(seconds_till_retry);
1070 seconds_till_retry = 5;
1076 check all connections to see if anything
1077 happened on their sockets
1079 void check_network_activity(fd_set *f)
1084 if(FD_ISSET(udp_socket, f))
1085 handle_incoming_vpn_data();
1087 for(node = connection_tree->head; node; node = node->next)
1089 c = (connection_t *)node->data;
1091 if(c->status.remove)
1094 if(FD_ISSET(c->socket, f))
1095 if(receive_meta(c) < 0)
1097 terminate_connection(c, c->status.active);
1102 if(FD_ISSET(tcp_socket, f))
1103 handle_new_meta_connection();
1108 this is where it all happens...
1110 void main_loop(void)
1115 time_t last_ping_check;
1117 vpn_packet_t packet;
1119 last_ping_check = time(NULL);
1123 tv.tv_sec = timeout;
1128 if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0)
1130 if(errno != EINTR) /* because of alarm */
1132 syslog(LOG_ERR, _("Error while waiting for input: %m"));
1139 syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds"));
1141 close_network_connections();
1142 exit_configuration(&config_tree);
1144 if(read_server_config())
1146 syslog(LOG_ERR, _("Unable to reread configuration file, exiting"));
1152 if(setup_network_connections())
1160 /* Let's check if everybody is still alive */
1162 if(last_ping_check + timeout < t)
1164 check_dead_connections();
1165 last_ping_check = time(NULL);
1167 /* Should we regenerate our key? */
1171 if(debug_lvl >= DEBUG_STATUS)
1172 syslog(LOG_INFO, _("Regenerating symmetric key"));
1174 RAND_pseudo_bytes(myself->key, myself->keylength);
1175 send_key_changed(myself->connection, myself);
1176 keyexpires = time(NULL) + keylifetime;
1182 check_network_activity(&fset);
1184 /* local tap data */
1185 if(FD_ISSET(device_fd, &fset))
1187 if(read_packet(&packet))
1190 route_outgoing(&packet);