/*
net.c -- most of the network code
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2006 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2012 Guus Sliepen <guus@tinc-vpn.org>
+ 2006 Scott Lamb <slamb@slamb.org>
+ 2011 Loïc Grenié <loic.grenie@gmail.com>
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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- $Id$
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
-#include <openssl/rand.h>
-
#include "utils.h"
#include "splay_tree.h"
#include "conf.h"
#include "subnet.h"
#include "xalloc.h"
+int contradicting_add_edge = 0;
+int contradicting_del_edge = 0;
+static int sleeptime = 10;
+
/* Purge edges and subnets of unreachable nodes. Use carefully. */
void purge(void) {
edge_t *e;
subnet_t *s;
- cp();
-
- ifdebug(PROTOCOL) logger(LOG_DEBUG, _("Purging unreachable nodes"));
+ logger(DEBUG_PROTOCOL, LOG_DEBUG, "Purging unreachable nodes");
/* Remove all edges and subnets owned by unreachable nodes. */
n = nnode->data;
if(!n->status.reachable) {
- ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Purging node %s (%s)"), n->name,
- n->hostname);
+ logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Purging node %s (%s)", n->name, n->hostname);
for(snode = n->subnet_tree->head; snode; snode = snext) {
snext = snode->next;
s = snode->data;
- if(!tunnelserver)
- send_del_subnet(broadcast, s);
- subnet_del(n, s);
+ send_del_subnet(everyone, s);
+ if(!strictsubnets)
+ subnet_del(n, s);
}
for(enode = n->edge_tree->head; enode; enode = enext) {
enext = enode->next;
e = enode->data;
if(!tunnelserver)
- send_del_edge(broadcast, e);
+ send_del_edge(everyone, e);
edge_del(e);
}
}
break;
}
- if(!enode)
+ if(!enode && (!strictsubnets || !n->subnet_tree->head))
+ /* in strictsubnets mode do not delete nodes with subnets */
node_del(n);
}
}
- Deactivate the host
*/
void terminate_connection(connection_t *c, bool report) {
- cp();
-
- ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Closing connection with %s (%s)"),
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Closing connection with %s (%s)",
c->name, c->hostname);
c->status.active = false;
- if(c->node)
+ if(c->node && c->node->connection == c)
c->node->connection = NULL;
- if(c->socket)
- closesocket(c->socket);
-
if(c->edge) {
if(report && !tunnelserver)
- send_del_edge(broadcast, c->edge);
+ send_del_edge(everyone, c->edge);
edge_del(c->edge);
+ c->edge = NULL;
/* Run MST and SSSP algorithms */
e = lookup_edge(c->node, myself);
if(e) {
if(!tunnelserver)
- send_del_edge(broadcast, e);
+ send_del_edge(everyone, e);
edge_del(e);
}
}
}
- /* Check if this was our outgoing connection */
+ free_connection_partially(c);
- if(c->outgoing)
- retry_outgoing(c->outgoing);
+ /* Check if this was our outgoing connection */
- connection_del(c);
+ if(c->outgoing) {
+ do_outgoing_connection(c);
+ } else {
+ connection_del(c);
+ }
}
/*
connection_t *c;
time_t now = time(NULL);
- cp();
-
for(node = connection_tree->head; node; node = next) {
next = node->next;
c = node->data;
- if(c->last_ping_time + pingtimeout < now) {
+ if(c->status.control)
+ continue;
+
+ if(c->last_ping_time + pingtimeout <= now) {
if(c->status.active) {
if(c->status.pinged) {
- ifdebug(CONNECTIONS) logger(LOG_INFO, _("%s (%s) didn't respond to PING in %ld seconds"),
- c->name, c->hostname, now - c->last_ping_time);
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "%s (%s) didn't respond to PING in %ld seconds",
+ c->name, c->hostname, (long)now - c->last_ping_time);
terminate_connection(c, true);
continue;
- } else if(c->last_ping_time + pinginterval < now) {
+ } else if(c->last_ping_time + pinginterval <= now) {
send_ping(c);
}
} else {
if(c->status.connecting) {
- ifdebug(CONNECTIONS)
- logger(LOG_WARNING, _("Timeout while connecting to %s (%s)"), c->name, c->hostname);
+ logger(DEBUG_CONNECTIONS, LOG_WARNING, "Timeout while connecting to %s (%s)", c->name, c->hostname);
c->status.connecting = false;
closesocket(c->socket);
do_outgoing_connection(c);
} else {
- ifdebug(CONNECTIONS) logger(LOG_WARNING, _("Timeout from %s (%s) during authentication"), c->name, c->hostname);
+ logger(DEBUG_CONNECTIONS, LOG_WARNING, "Timeout from %s (%s) during authentication", c->name, c->hostname);
terminate_connection(c, false);
continue;
}
}
}
+ if(contradicting_del_edge > 100 && contradicting_add_edge > 100) {
+ logger(DEBUG_ALWAYS, LOG_WARNING, "Possible node with same Name as us! Sleeping %d seconds.", sleeptime);
+ usleep(sleeptime * 1000000LL);
+ sleeptime *= 2;
+ if(sleeptime < 0)
+ sleeptime = 3600;
+ } else {
+ sleeptime /= 2;
+ if(sleeptime < 10)
+ sleeptime = 10;
+ }
+
+ contradicting_add_edge = 0;
+ contradicting_del_edge = 0;
+
event_add(event, &(struct timeval){pingtimeout, 0});
}
void handle_meta_connection_data(int fd, short events, void *data) {
connection_t *c = data;
int result;
- socklen_t len = sizeof(result);
+ socklen_t len = sizeof result;
if(c->status.connecting) {
c->status.connecting = false;
if(!result)
finish_connecting(c);
else {
- ifdebug(CONNECTIONS) logger(LOG_DEBUG,
- _("Error while connecting to %s (%s): %s"),
- c->name, c->hostname, strerror(result));
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG,
+ "Error while connecting to %s (%s): %s",
+ c->name, c->hostname, sockstrerror(result));
closesocket(c->socket);
do_outgoing_connection(c);
return;
}
static void sigterm_handler(int signal, short events, void *data) {
- logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
event_loopexit(NULL);
}
static void sighup_handler(int signal, short events, void *data) {
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
+ reopenlogger();
+ reload_configuration();
+}
+
+static void sigalrm_handler(int signal, short events, void *data) {
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
+ retry();
+}
+
+int reload_configuration(void) {
connection_t *c;
splay_node_t *node, *next;
char *fname;
struct stat s;
static time_t last_config_check = 0;
-
- logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
/* Reread our own configuration file */
init_configuration(&config_tree);
if(!read_server_config()) {
- logger(LOG_ERR, _("Unable to reread configuration file, exitting."));
+ logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reread configuration file, exitting.");
event_loopexit(NULL);
- return;
+ return EINVAL;
}
+ read_config_options(config_tree, NULL);
+
+ xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, myself->name);
+ read_config_file(config_tree, fname);
+ free(fname);
+
+ /* Parse some options that are allowed to be changed while tinc is running */
+
+ setup_myself_reloadable();
+
/* Close connections to hosts that have a changed or deleted host config file */
for(node = connection_tree->head; node; node = next) {
c = node->data;
next = node->next;
+
+ if(c->status.control)
+ continue;
if(c->outgoing) {
free(c->outgoing->name);
c->outgoing = NULL;
}
- asprintf(&fname, "%s/hosts/%s", confbase, c->name);
+ xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
if(stat(fname, &s) || s.st_mtime > last_config_check)
terminate_connection(c, c->status.active);
free(fname);
last_config_check = time(NULL);
+ /* If StrictSubnet is set, expire deleted Subnets and read new ones in */
+
+ if(strictsubnets) {
+ subnet_t *subnet;
+
+ for(node = subnet_tree->head; node; node = node->next) {
+ subnet = node->data;
+ subnet->expires = 1;
+ }
+
+ load_all_subnets();
+
+ for(node = subnet_tree->head; node; node = next) {
+ next = node->next;
+ subnet = node->data;
+ if(subnet->expires == 1) {
+ send_del_subnet(everyone, subnet);
+ if(subnet->owner->status.reachable)
+ subnet_update(subnet->owner, subnet, false);
+ subnet_del(subnet->owner, subnet);
+ } else if(subnet->expires == -1) {
+ subnet->expires = 0;
+ } else {
+ send_add_subnet(everyone, subnet);
+ if(subnet->owner->status.reachable)
+ subnet_update(subnet->owner, subnet, true);
+ }
+ }
+ } else { /* Only read our own subnets back in */
+ subnet_t *subnet, *s2;
+
+ for(node = myself->subnet_tree->head; node; node = node->next) {
+ subnet_t *subnet = node->data;
+ logger(DEBUG_ALWAYS, LOG_DEBUG, "subnet %p expires %d", subnet, (int)subnet->expires);
+ if(!subnet->expires)
+ subnet->expires = 1;
+ }
+
+ config_t *cfg = lookup_config(config_tree, "Subnet");
+
+ while(cfg) {
+ if(!get_config_subnet(cfg, &subnet))
+ continue;
+
+ if((s2 = lookup_subnet(myself, subnet))) {
+ logger(DEBUG_ALWAYS, LOG_DEBUG, "read subnet that already exists: %p expires %d", s2, (int)s2->expires);
+ if(s2->expires == 1)
+ s2->expires = 0;
+
+ free_subnet(subnet);
+ } else {
+ logger(DEBUG_ALWAYS, LOG_DEBUG, "read new subnet %p", subnet);
+ subnet_add(myself, subnet);
+ send_add_subnet(everyone, subnet);
+ subnet_update(myself, subnet, true);
+ }
+
+ cfg = lookup_config_next(config_tree, cfg);
+ }
+
+ for(node = myself->subnet_tree->head; node; node = next) {
+ next = node->next;
+ subnet_t *subnet = node->data;
+ if(subnet->expires == 1) {
+ logger(DEBUG_ALWAYS, LOG_DEBUG, "removed subnet %p", subnet);
+ send_del_subnet(everyone, subnet);
+ subnet_update(myself, subnet, false);
+ subnet_del(myself, subnet);
+ }
+ }
+ }
+
/* Try to make outgoing connections */
try_outgoing_connections();
+
+ return 0;
}
void retry(void) {
connection_t *c;
- splay_node_t *node;
+ splay_node_t *node, *next;
- for(node = connection_tree->head; node; node = node->next) {
+ for(node = connection_tree->head; node; node = next) {
+ next = node->next;
c = node->data;
if(c->outgoing && !c->node) {
*/
int main_loop(void) {
struct event timeout_event;
+
+ timeout_set(&timeout_event, timeout_handler, &timeout_event);
+ event_add(&timeout_event, &(struct timeval){pingtimeout, 0});
+
+#ifndef HAVE_MINGW
struct event sighup_event;
struct event sigterm_event;
struct event sigquit_event;
+ struct event sigalrm_event;
- cp();
-
- 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(&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(&sigalrm_event, SIGALRM, sigalrm_handler, NULL);
+ signal_add(&sigalrm_event, NULL);
+#endif
if(event_loop(0) < 0) {
- logger(LOG_ERR, _("Error while waiting for input: %s"), strerror(errno));
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error while waiting for input: %s", strerror(errno));
return 1;
}
+#ifndef HAVE_MINGW
signal_del(&sighup_event);
signal_del(&sigterm_event);
signal_del(&sigquit_event);
+ signal_del(&sigalrm_event);
+#endif
+
event_del(&timeout_event);
return 0;