/*
net.c -- most of the network code
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2006 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2010 Guus Sliepen <guus@tinc-vpn.org>
+ 2006 Scott Lamb <slamb@slamb.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
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 "avl_tree.h"
+#include "splay_tree.h"
#include "conf.h"
#include "connection.h"
#include "device.h"
#include "subnet.h"
#include "xalloc.h"
-volatile bool running = false;
+int contradicting_add_edge = 0;
+int contradicting_del_edge = 0;
/* Purge edges and subnets of unreachable nodes. Use carefully. */
-static void purge(void)
-{
- avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext;
+void purge(void) {
+ splay_node_t *nnode, *nnext, *enode, *enext, *snode, *snext;
node_t *n;
edge_t *e;
subnet_t *s;
- cp();
-
- ifdebug(PROTOCOL) logger(LOG_DEBUG, _("Purging unreachable nodes"));
+ ifdebug(PROTOCOL) logger(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,
+ 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 = snode->data;
- if(!tunnelserver)
- send_del_subnet(broadcast, s);
- subnet_del(n, s);
+ send_del_subnet(broadcast, s);
+ if(!strictsubnets)
+ subnet_del(n, s);
}
for(enode = n->edge_tree->head; enode; enode = enext) {
break;
}
- if(!enode)
+ if(!enode && (!strictsubnets || !n->subnet_tree->head))
+ /* in strictsubnets mode do not delete nodes with subnets */
node_del(n);
}
}
}
-/*
- put all file descriptors into events
- While we're at it, purge stuf that needs to be removed.
-*/
-static int build_fdset(void)
-{
- avl_node_t *node, *next;
- connection_t *c;
- int i, max = 0;
-
- cp();
-
- for(node = connection_tree->head; node; node = next) {
- next = node->next;
- c = node->data;
-
- if(c->status.remove) {
- connection_del(c);
- if(!connection_tree->head)
- purge();
- }
- }
-
- return 0;
-}
-
/*
Terminate a connection:
- Close the socket
- Check if we need to retry making an outgoing connection
- Deactivate the host
*/
-void terminate_connection(connection_t *c, bool report)
-{
- cp();
-
- if(c->status.remove)
- return;
-
- ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Closing connection with %s (%s)"),
+void terminate_connection(connection_t *c, bool report) {
+ ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Closing connection with %s (%s)",
c->name, c->hostname);
- c->status.remove = true;
c->status.active = false;
if(c->node)
if(c->socket)
closesocket(c->socket);
- event_del(&c->ev);
-
if(c->edge) {
if(report && !tunnelserver)
send_del_edge(broadcast, c->edge);
/* Check if this was our outgoing connection */
- if(c->outgoing) {
+ if(c->outgoing)
retry_outgoing(c->outgoing);
- c->outgoing = NULL;
- }
- free(c->outbuf);
- c->outbuf = NULL;
- c->outbuflen = 0;
- c->outbufsize = 0;
- c->outbufstart = 0;
+ connection_del(c);
}
/*
end does not reply in time, we consider them dead
and close the connection.
*/
-static void timeout_handler(int fd, short events, void *event)
-{
- avl_node_t *node, *next;
+static void timeout_handler(void *arg) {
+ event_t *event = arg;
+ splay_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 = node->data;
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"),
+ 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);
+ continue;
} else if(c->last_ping_time + pinginterval < now) {
send_ping(c);
}
} else {
- if(c->status.remove) {
- 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;
- }
- ifdebug(CONNECTIONS) logger(LOG_WARNING, _("Timeout from %s (%s) during authentication"),
- c->name, c->hostname);
if(c->status.connecting) {
+ ifdebug(CONNECTIONS)
+ logger(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);
terminate_connection(c, false);
+ continue;
}
}
}
}
- event_add(event, &(struct timeval){pingtimeout, 0});
+ if(contradicting_del_edge && contradicting_add_edge) {
+ logger(LOG_WARNING, "Possible node with same Name as us!");
+
+ if(rand() % 3 == 0) {
+ logger(LOG_ERR, "Shutting down, check configuration of all nodes for duplicate Names!");
+ abort();
+ return;
+ }
+
+ contradicting_add_edge = 0;
+ contradicting_del_edge = 0;
+ }
+
+ event->time = now + pingtimeout;
+ event_add(event);
}
-void handle_meta_connection_data(int fd, short events, void *data)
-{
+void handle_meta_connection_data(void *data) {
connection_t *c = data;
int result;
- socklen_t len = sizeof(result);
-
- if (c->status.remove)
- return;
+ socklen_t len = sizeof result;
if(c->status.connecting) {
+ c->status.connecting = false;
+
getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
- if(!result)
+ if(!result) {
+ mutex_lock(&mutex);
finish_connecting(c);
- else {
+ mutex_unlock(&mutex);
+ } else {
ifdebug(CONNECTIONS) logger(LOG_DEBUG,
- _("Error while connecting to %s (%s): %s"),
- c->name, c->hostname, strerror(result));
- c->status.connecting = false;
+ "Error while connecting to %s (%s): %s",
+ c->name, c->hostname, sockstrerror(result));
closesocket(c->socket);
+ mutex_lock(&mutex);
do_outgoing_connection(c);
+ mutex_unlock(&mutex);
return;
}
}
- if (!receive_meta(c)) {
- terminate_connection(c, c->status.active);
- return;
+ while(true) {
+ if (!receive_meta(c)) {
+ terminate_connection(c, c->status.active);
+ break;
+ }
}
}
-static void dummy(int a, short b, void *c)
-{
-}
-
static void sigterm_handler(int signal, short events, void *data) {
- logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
- running = false;
- event_loopexit(NULL);
-}
-
-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;
- }
+ logger(LOG_NOTICE, "Got %s signal", strsignal(signal));
+ exit(0);
}
-static void sigusr1_handler(int signal, short events, void *data) {
- logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
- dump_connections();
-}
-
-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();
-}
-
-static void sigwinch_handler(int signal, short events, void *data) {
- logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
- purge();
+static void sighup_handler(int signal, short events, void *data) {
+ logger(LOG_NOTICE, "Got %s signal", strsignal(signal));
+ reload_configuration();
}
-static void sighup_handler(int signal, short events, void *data) {
+int reload_configuration(void) {
connection_t *c;
- avl_node_t *node;
+ 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."));
- event_loopexit(NULL);
- return;
+ logger(LOG_ERR, "Unable to reread configuration file, exitting.");
+ abort();
+ return EINVAL;
}
/* Close connections to hosts that have a changed or deleted host config file */
- for(node = connection_tree->head; node; node = node->next) {
+ for(node = connection_tree->head; node; node = next) {
c = node->data;
+ next = node->next;
if(c->outgoing) {
free(c->outgoing->name);
c->outgoing = NULL;
}
- asprintf(&fname, "%s/hosts/%s", confbase, c->name);
+ xasprintf(&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);
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(broadcast, 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(broadcast, subnet);
+ if(subnet->owner->status.reachable)
+ subnet_update(subnet->owner, subnet, true);
+ }
+ }
+ }
+
/* Try to make outgoing connections */
try_outgoing_connections();
-}
-static void sigalrm_handler(int signal, short events, void *data) {
- logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
+ return 0;
+}
+void retry(void) {
connection_t *c;
- avl_node_t *node;
+ splay_node_t *node;
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);
+ event_del(&c->outgoing->ev);
if(c->status.connecting)
close(c->socket);
c->outgoing->timeout = 0;
/*
this is where it all happens...
*/
-int main_loop(void)
-{
- struct timeval tv;
- int r;
+int main_loop(void) {
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;
-
- 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(&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;
+
+ timeout_event.time = time(NULL) + pingtimeout;
+ timeout_event.handler = timeout_handler;
+ timeout_event.data = &timeout_event;
+
+ event_add(&timeout_event);
+
+#ifdef SIGHUP
+ signal(SIGHUP, sighup_handler);
+#endif
+#ifdef SIGTERM
+ signal(SIGTERM, sigterm_handler);
+#endif
+#ifdef SIGQUIT
+ signal(SIGQUIT, sigterm_handler);
+#endif
+
+ while(true) {
+ mutex_unlock(&mutex);
+ usleep(1000000);
+ mutex_lock(&mutex);
+
+ struct event *event;
+ while((event = get_expired_event())) {
+ event->handler(event->data);
+ }
}
- 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;
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