/*
net.c -- most of the network code
- Copyright (C) 1998-2002 Ivo Timmermans <ivo@o2w.nl>,
- 2000-2002 Guus Sliepen <guus@sliepen.eu.org>
+ Copyright (C) 1998-2005 Ivo Timmermans,
+ 2000-2006 Guus Sliepen <guus@tinc-vpn.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: net.c,v 1.35.4.185 2003/04/19 11:12:45 guus Exp $
+ $Id$
*/
-#include "config.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <netdb.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <signal.h>
-#include <sys/time.h>
-#include <sys/types.h>
-#include <syslog.h>
-#include <unistd.h>
-#include <sys/ioctl.h>
-/* SunOS really wants sys/socket.h BEFORE net/if.h,
- and FreeBSD wants these lines below the rest. */
-#include <arpa/inet.h>
-#include <sys/socket.h>
-#include <net/if.h>
-#ifdef HAVE_NETINET_IN_SYSTM_H
-#include <netinet/in_systm.h>
-#endif
-#include <netinet/in.h>
-#ifdef HAVE_NETINET_IP_H
-#include <netinet/ip.h>
-#endif
-#ifdef HAVE_NETINET_TCP_H
-#include <netinet/tcp.h>
-#endif
+#include "system.h"
#include <openssl/rand.h>
-#include <utils.h>
-#include <xalloc.h>
-#include <avl_tree.h>
-#include <list.h>
-
+#include "utils.h"
+#include "avl_tree.h"
#include "conf.h"
#include "connection.h"
+#include "device.h"
+#include "graph.h"
+#include "logger.h"
#include "meta.h"
#include "net.h"
#include "netutl.h"
#include "process.h"
#include "protocol.h"
#include "subnet.h"
-#include "graph.h"
-#include "process.h"
-#include "route.h"
-#include "device.h"
-#include "event.h"
-
-#include "system.h"
-
-#ifndef HAVE_RAND_PSEUDO_BYTES
-#define RAND_pseudo_bytes RAND_bytes
-#endif
-
-int do_purge = 0;
-int sighup = 0;
-int sigalrm = 0;
-
-time_t now = 0;
+#include "xalloc.h"
/* Purge edges and subnets of unreachable nodes. Use carefully. */
-void purge(void)
+static void purge(void)
{
avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext;
node_t *n;
cp();
- if(debug_lvl >= DEBUG_PROTOCOL)
- syslog(LOG_DEBUG, _("Purging unreachable nodes"));
+ ifdebug(PROTOCOL) logger(LOG_DEBUG, _("Purging unreachable nodes"));
+
+ /* Remove all edges and subnets owned by unreachable nodes. */
for(nnode = node_tree->head; nnode; nnode = nnext) {
nnext = nnode->next;
- n = (node_t *) nnode->data;
+ n = nnode->data;
if(!n->status.reachable) {
- if(debug_lvl >= DEBUG_SCARY_THINGS)
- syslog(LOG_DEBUG, _("Purging node %s (%s)"), n->name,
+ ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Purging node %s (%s)"), n->name,
n->hostname);
for(snode = n->subnet_tree->head; snode; snode = snext) {
snext = snode->next;
- s = (subnet_t *) snode->data;
- send_del_subnet(broadcast, s);
+ s = snode->data;
+ if(!tunnelserver)
+ send_del_subnet(broadcast, s);
subnet_del(n, s);
}
for(enode = n->edge_tree->head; enode; enode = enext) {
enext = enode->next;
- e = (edge_t *) enode->data;
- send_del_edge(broadcast, e);
+ e = enode->data;
+ if(!tunnelserver)
+ send_del_edge(broadcast, e);
edge_del(e);
}
+ }
+ }
+
+ /* Check if anyone else claims to have an edge to an unreachable node. If not, delete node. */
+
+ for(nnode = node_tree->head; nnode; nnode = nnext) {
+ nnext = nnode->next;
+ n = nnode->data;
+
+ if(!n->status.reachable) {
+ for(enode = edge_weight_tree->head; enode; enode = enext) {
+ enext = enode->next;
+ e = enode->data;
+
+ if(e->to == n)
+ break;
+ }
- node_del(n);
+ if(!enode)
+ node_del(n);
}
}
}
/*
- put all file descriptors in an fd_set array
- While we're at it, purge stuff that needs to be removed.
+ put all file descriptors into events
+ While we're at it, purge stuf that needs to be removed.
*/
-int build_fdset(fd_set * fs)
+static int build_fdset(void)
{
avl_node_t *node, *next;
connection_t *c;
cp();
- FD_ZERO(fs);
-
for(node = connection_tree->head; node; node = next) {
next = node->next;
- c = (connection_t *) node->data;
+ c = node->data;
if(c->status.remove) {
connection_del(c);
if(!connection_tree->head)
purge();
- } else {
- FD_SET(c->socket, fs);
- if(c->socket > max)
- max = c->socket;
}
}
- for(i = 0; i < listen_sockets; i++) {
- FD_SET(listen_socket[i].tcp, fs);
- if(listen_socket[i].tcp > max)
- max = listen_socket[i].tcp;
- FD_SET(listen_socket[i].udp, fs);
- if(listen_socket[i].udp > max)
- max = listen_socket[i].udp;
- }
-
- FD_SET(device_fd, fs);
- if(device_fd > max)
- max = device_fd;
-
- return max;
+ return 0;
}
/*
Terminate a connection:
- Close the socket
- - Remove associated edge and tell other connections about it if report = 1
+ - Remove associated edge and tell other connections about it if report = true
- Check if we need to retry making an outgoing connection
- Deactivate the host
*/
-void terminate_connection(connection_t *c, int report)
+void terminate_connection(connection_t *c, bool report)
{
cp();
if(c->status.remove)
return;
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Closing connection with %s (%s)"),
+ ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Closing connection with %s (%s)"),
c->name, c->hostname);
- c->status.remove = 1;
- c->status.active = 0;
+ c->status.remove = true;
+ c->status.active = false;
if(c->node)
c->node->connection = NULL;
if(c->socket)
- close(c->socket);
+ closesocket(c->socket);
+
+ event_del(&c->ev);
if(c->edge) {
- if(report)
+ if(report && !tunnelserver)
send_del_edge(broadcast, c->edge);
edge_del(c->edge);
/* Run MST and SSSP algorithms */
graph();
+
+ /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
+
+ if(report && !c->node->status.reachable) {
+ edge_t *e;
+ e = lookup_edge(c->node, myself);
+ if(e) {
+ if(!tunnelserver)
+ send_del_edge(broadcast, e);
+ edge_del(e);
+ }
+ }
}
/* Check if this was our outgoing connection */
retry_outgoing(c->outgoing);
c->outgoing = NULL;
}
+
+ free(c->outbuf);
+ c->outbuf = NULL;
+ c->outbuflen = 0;
+ c->outbufsize = 0;
+ c->outbufstart = 0;
}
/*
end does not reply in time, we consider them dead
and close the connection.
*/
-void check_dead_connections(void)
+static void timeout_handler(int fd, short events, void *event)
{
avl_node_t *node, *next;
connection_t *c;
+ time_t now = time(NULL);
cp();
for(node = connection_tree->head; node; node = next) {
next = node->next;
- c = (connection_t *) node->data;
+ c = node->data;
if(c->last_ping_time + pingtimeout < now) {
if(c->status.active) {
if(c->status.pinged) {
- if(debug_lvl >= DEBUG_PROTOCOL)
- syslog(LOG_INFO, _("%s (%s) didn't respond to PING"),
- c->name, c->hostname);
- c->status.timeout = 1;
- terminate_connection(c, 1);
- } else {
+ ifdebug(CONNECTIONS) logger(LOG_INFO, _("%s (%s) didn't respond to PING in %ld seconds"),
+ c->name, c->hostname, now - c->last_ping_time);
+ c->status.timeout = true;
+ terminate_connection(c, true);
+ } else if(c->last_ping_time + pinginterval < now) {
send_ping(c);
}
} else {
if(c->status.remove) {
- syslog(LOG_WARNING, _("Old connection_t for %s (%s) status %04x still lingering, deleting..."),
- c->name, c->hostname, c->status);
+ logger(LOG_WARNING, _("Old connection_t for %s (%s) status %04x still lingering, deleting..."),
+ c->name, c->hostname, c->status.value);
connection_del(c);
continue;
}
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"),
+ ifdebug(CONNECTIONS) logger(LOG_WARNING, _("Timeout from %s (%s) during authentication"),
c->name, c->hostname);
- terminate_connection(c, 0);
+ if(c->status.connecting) {
+ c->status.connecting = false;
+ closesocket(c->socket);
+ do_outgoing_connection(c);
+ } else {
+ terminate_connection(c, false);
+ }
}
}
}
+
+ event_add(event, &(struct timeval){pingtimeout, 0});
}
-/*
- check all connections to see if anything
- happened on their sockets
-*/
-void check_network_activity(fd_set * f)
+void handle_meta_connection_data(int fd, short events, void *data)
{
- connection_t *c;
- avl_node_t *node;
- int result, i;
- int len = sizeof(result);
- vpn_packet_t packet;
-
- cp();
+ connection_t *c = data;
+ int result;
+ socklen_t len = sizeof(result);
- if(FD_ISSET(device_fd, f)) {
- if(!read_packet(&packet))
- route_outgoing(&packet);
- }
-
- for(node = connection_tree->head; node; node = node->next) {
- c = (connection_t *) node->data;
-
- if(c->status.remove)
- continue;
-
- if(FD_ISSET(c->socket, f)) {
- if(c->status.connecting) {
- c->status.connecting = 0;
- getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
-
- if(!result)
- finish_connecting(c);
- else {
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_DEBUG,
- _("Error while connecting to %s (%s): %s"),
- c->name, c->hostname, strerror(result));
- close(c->socket);
- do_outgoing_connection(c);
- continue;
- }
- }
+ if (c->status.remove)
+ return;
- if(receive_meta(c) < 0) {
- terminate_connection(c, c->status.active);
- continue;
- }
+ if(c->status.connecting) {
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
+
+ if(!result)
+ finish_connecting(c);
+ else {
+ ifdebug(CONNECTIONS) logger(LOG_DEBUG,
+ _("Error while connecting to %s (%s): %s"),
+ c->name, c->hostname, strerror(result));
+ c->status.connecting = false;
+ closesocket(c->socket);
+ do_outgoing_connection(c);
+ return;
}
}
- for(i = 0; i < listen_sockets; i++) {
- if(FD_ISSET(listen_socket[i].udp, f))
- handle_incoming_vpn_data(listen_socket[i].udp);
-
- if(FD_ISSET(listen_socket[i].tcp, f))
- handle_new_meta_connection(listen_socket[i].tcp);
+ if (!receive_meta(c)) {
+ terminate_connection(c, c->status.active);
+ return;
}
}
-/*
- this is where it all happens...
-*/
-void main_loop(void)
-{
- fd_set fset;
- struct timeval tv;
- int r, maxfd;
- time_t last_ping_check, last_config_check;
- event_t *event;
-
- cp();
+static void sigterm_handler(int signal, short events, void *data) {
+ logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
+ event_loopexit(NULL);
+}
- last_ping_check = now;
- last_config_check = now;
- srand(now);
+static void sigint_handler(int signal, short events, void *data) {
+ static int saved_debug_level = -1;
+
+ logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
+
+ if(saved_debug_level != -1) {
+ logger(LOG_NOTICE, _("Reverting to old debug level (%d)"),
+ saved_debug_level);
+ debug_level = saved_debug_level;
+ saved_debug_level = -1;
+ } else {
+ logger(LOG_NOTICE,
+ _("Temporarily setting debug level to 5. Kill me with SIGINT again to go back to level %d."),
+ debug_level);
+ saved_debug_level = debug_level;
+ debug_level = 5;
+ }
+}
- for(;;) {
- now = time(NULL);
+static void sigusr1_handler(int signal, short events, void *data) {
+ logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
+ dump_connections();
+}
- tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */
- tv.tv_usec = 0;
+static void sigusr2_handler(int signal, short events, void *data) {
+ logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
+ dump_device_stats();
+ dump_nodes();
+ dump_edges();
+ dump_subnets();
+}
- maxfd = build_fdset(&fset);
+static void sigwinch_handler(int signal, short events, void *data) {
+ logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
+ purge();
+}
- r = select(maxfd + 1, &fset, NULL, NULL, &tv);
+static void sighup_handler(int signal, short events, void *data) {
+ connection_t *c;
+ avl_node_t *node;
+ char *fname;
+ struct stat s;
+ static time_t last_config_check = 0;
+
+ logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
- if(r < 0) {
- if(errno != EINTR && errno != EAGAIN) {
- syslog(LOG_ERR, _("Error while waiting for input: %s"),
- strerror(errno));
- cp_trace();
- dump_connections();
- return;
- }
+ /* Reread our own configuration file */
- continue;
- }
+ exit_configuration(&config_tree);
+ init_configuration(&config_tree);
- check_network_activity(&fset);
+ if(!read_server_config()) {
+ logger(LOG_ERR, _("Unable to reread configuration file, exitting."));
+ event_loopexit(NULL);
+ return;
+ }
- if(do_purge) {
- purge();
- do_purge = 0;
+ /* Close connections to hosts that have a changed or deleted host config file */
+
+ for(node = connection_tree->head; node; node = node->next) {
+ c = node->data;
+
+ if(c->outgoing) {
+ free(c->outgoing->name);
+ if(c->outgoing->ai)
+ freeaddrinfo(c->outgoing->ai);
+ free(c->outgoing);
+ c->outgoing = NULL;
}
+
+ asprintf(&fname, "%s/hosts/%s", confbase, c->name);
+ if(stat(fname, &s) || s.st_mtime > last_config_check)
+ terminate_connection(c, c->status.active);
+ free(fname);
+ }
- /* Let's check if everybody is still alive */
-
- if(last_ping_check + pingtimeout < now) {
- check_dead_connections();
- last_ping_check = now;
-
- if(routing_mode == RMODE_SWITCH)
- age_mac();
-
- age_past_requests();
-
- /* Should we regenerate our key? */
-
- if(keyexpires < now) {
- if(debug_lvl >= DEBUG_STATUS)
- syslog(LOG_INFO, _("Regenerating symmetric key"));
-
- RAND_pseudo_bytes(myself->key, myself->keylength);
- send_key_changed(broadcast, myself);
- keyexpires = now + keylifetime;
- }
- }
+ last_config_check = time(NULL);
+ /* Try to make outgoing connections */
+
+ try_outgoing_connections();
+}
- while((event = get_expired_event())) {
- event->handler(event->data);
- free(event);
- }
+static void sigalrm_handler(int signal, short events, void *data) {
+ logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
- if(sigalrm) {
- syslog(LOG_INFO, _("Flushing event queue"));
+ connection_t *c;
+ avl_node_t *node;
- while(event_tree->head) {
- event = (event_t *) event_tree->head->data;
- event->handler(event->data);
- event_del(event);
- }
- sigalrm = 0;
+ for(node = connection_tree->head; node; node = node->next) {
+ c = node->data;
+
+ if(c->outgoing && !c->node) {
+ if(timeout_initialized(&c->outgoing->ev))
+ event_del(&c->outgoing->ev);
+ if(c->status.connecting)
+ close(c->socket);
+ c->outgoing->timeout = 0;
+ do_outgoing_connection(c);
}
+ }
+}
- if(sighup) {
- connection_t *c;
- avl_node_t *node;
- char *fname;
- struct stat s;
-
- sighup = 0;
-
- /* Reread our own configuration file */
-
- exit_configuration(&config_tree);
- init_configuration(&config_tree);
-
- if(read_server_config()) {
- syslog(LOG_ERR, _("Unable to reread configuration file, exitting."));
- exit(1);
- }
-
- /* Close connections to hosts that have a changed or deleted host config file */
-
- for(node = connection_tree->head; node; node = node->next) {
- c = (connection_t *) node->data;
-
- if(c->outgoing) {
- free(c->outgoing->name);
- freeaddrinfo(c->outgoing->ai);
- free(c->outgoing);
- c->outgoing = NULL;
- }
-
- asprintf(&fname, "%s/hosts/%s", confbase, c->name);
- if(stat(fname, &s) || s.st_mtime > last_config_check)
- terminate_connection(c, c->status.active);
- free(fname);
- }
+/*
+ this is where it all happens...
+*/
+int main_loop(void)
+{
+ struct timeval tv;
+ int r;
+ struct event timeout_event;
+ struct event sighup_event;
+ struct event sigint_event;
+ struct event sigterm_event;
+ struct event sigquit_event;
+ struct event sigusr1_event;
+ struct event sigusr2_event;
+ struct event sigwinch_event;
+ struct event sigalrm_event;
- last_config_check = now;
+ cp();
- /* Try to make outgoing connections */
-
- try_outgoing_connections();
-
- continue;
- }
+ timeout_set(&timeout_event, timeout_handler, &timeout_event);
+ event_add(&timeout_event, &(struct timeval){pingtimeout, 0});
+ signal_set(&sighup_event, SIGHUP, sighup_handler, NULL);
+ signal_add(&sighup_event, NULL);
+ signal_set(&sigint_event, SIGINT, sigint_handler, NULL);
+ signal_add(&sigint_event, NULL);
+ signal_set(&sigterm_event, SIGTERM, sigterm_handler, NULL);
+ signal_add(&sigterm_event, NULL);
+ signal_set(&sigquit_event, SIGQUIT, sigterm_handler, NULL);
+ signal_add(&sigquit_event, NULL);
+ signal_set(&sigusr1_event, SIGUSR1, sigusr1_handler, NULL);
+ signal_add(&sigusr1_event, NULL);
+ signal_set(&sigusr2_event, SIGUSR2, sigusr2_handler, NULL);
+ signal_add(&sigusr2_event, NULL);
+ signal_set(&sigwinch_event, SIGWINCH, sigwinch_handler, NULL);
+ signal_add(&sigwinch_event, NULL);
+ signal_set(&sigalrm_event, SIGALRM, sigalrm_handler, NULL);
+ signal_add(&sigalrm_event, NULL);
+
+ if(event_loop(0) < 0) {
+ logger(LOG_ERR, _("Error while waiting for input: %s"), strerror(errno));
+ return 1;
}
+
+ signal_del(&sighup_event);
+ signal_del(&sigint_event);
+ signal_del(&sigterm_event);
+ signal_del(&sigquit_event);
+ signal_del(&sigusr1_event);
+ signal_del(&sigusr2_event);
+ signal_del(&sigwinch_event);
+ signal_del(&sigalrm_event);
+ event_del(&timeout_event);
+
+ return 0;
}