/*
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 "avl_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;
+static int sleeptime = 10;
+time_t last_config_check = 0;
/* Purge edges and subnets of unreachable nodes. Use carefully. */
-static void purge(void)
-{
- avl_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"));
+void purge(void) {
+ logger(DEBUG_PROTOCOL, 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 = nnode->data;
-
+ for splay_each(node_t, n, node_tree) {
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);
+ for splay_each(subnet_t, s, n->subnet_tree) {
+ 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;
+ for splay_each(edge_t, e, n->edge_tree) {
if(!tunnelserver)
- send_del_edge(broadcast, e);
+ send_del_edge(everyone, 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;
-
+ for splay_each(node_t, n, node_tree) {
if(!n->status.reachable) {
- for(enode = edge_weight_tree->head; enode; enode = enext) {
- enext = enode->next;
- e = enode->data;
-
+ for splay_each(edge_t, e, edge_weight_tree)
if(e->to == n)
- break;
- }
+ return;
- if(!enode)
+ if(!autoconnect && (!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
- - Remove associated edge and tell other connections about it if report = true
+ - Mark it as inactive
+ - Remove the edge representing this connection
+ - Kill it with fire
- 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;
+void terminate_connection(connection_t *c, bool report) {
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Closing connection with %s (%s)", c->name, c->hostname);
- 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->node && c->node->connection == c)
c->node->connection = NULL;
- if(c->socket)
- closesocket(c->socket);
-
- event_del(&c->ev);
-
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 */
+ outgoing_t *outgoing = c->outgoing;
+ connection_del(c);
- if(c->outgoing) {
- retry_outgoing(c->outgoing);
- c->outgoing = NULL;
- }
+ /* Check if this was our outgoing connection */
- free(c->outbuf);
- c->outbuf = NULL;
- c->outbuflen = 0;
- c->outbufsize = 0;
- c->outbufstart = 0;
+ if(outgoing)
+ do_outgoing_connection(outgoing);
}
/*
end does not reply in time, we consider them dead
and close the connection.
*/
-static void check_dead_connections(void)
-{
- avl_node_t *node, *next;
- connection_t *c;
+static void timeout_handler(int fd, short events, void *event) {
time_t now = time(NULL);
- cp();
+ for list_each(connection_t, c, connection_list) {
+ if(c->status.control)
+ continue;
- for(node = connection_tree->head; node; node = next) {
- next = node->next;
- c = node->data;
-
- if(c->last_ping_time + pingtimeout < now) {
+ 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);
- c->status.timeout = true;
- terminate_connection(c, true);
- } else if(c->last_ping_time + pinginterval < now) {
+ 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);
+ } else if(c->last_ping_time + pinginterval <= now) {
send_ping(c);
+ continue;
+ } else {
+ continue;
}
} 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);
+ if(c->status.connecting)
+ logger(DEBUG_CONNECTIONS, LOG_WARNING, "Timeout while connecting to %s (%s)", c->name, c->hostname);
+ else
+ logger(DEBUG_CONNECTIONS, LOG_WARNING, "Timeout from %s (%s) during authentication", c->name, c->hostname);
+ }
+ terminate_connection(c, c->status.active);
+ }
+ }
+
+ event_add(event, &(struct timeval){pingtimeout, rand() % 100000});
+}
+
+static void periodic_handler(int fd, short events, void *event) {
+ /* Check if there are too many contradicting ADD_EDGE and DEL_EDGE messages.
+ This usually only happens when another node has the same Name as this node.
+ If so, sleep for a short while to prevent a storm of contradicting messages.
+ */
+
+ 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;
+
+ /* If AutoConnect is set, check if we need to make or break connections. */
+
+ if(autoconnect && node_tree->count > 1) {
+ /* Count number of active connections */
+ int nc = 0;
+ for list_each(connection_t, c, connection_list) {
+ if(c->status.active && !c->status.control)
+ nc++;
+ }
+
+ if(nc < autoconnect) {
+ /* Not enough active connections, try to add one.
+ Choose a random node, if we don't have a connection to it,
+ and we are not already trying to make one, create an
+ outgoing connection to this node.
+ */
+ int r = rand() % node_tree->count;
+ int i = 0;
+
+ for splay_each(node_t, n, node_tree) {
+ if(i++ != r)
continue;
+
+ if(n->connection)
+ break;
+
+ bool found = false;
+
+ for list_each(outgoing_t, outgoing, outgoing_list) {
+ if(!strcmp(outgoing->name, n->name)) {
+ found = true;
+ break;
+ }
}
- ifdebug(CONNECTIONS) logger(LOG_WARNING, _("Timeout from %s (%s) during authentication"),
- c->name, c->hostname);
- if(c->status.connecting) {
- c->status.connecting = false;
- closesocket(c->socket);
- do_outgoing_connection(c);
- } else {
- terminate_connection(c, false);
+
+ if(!found) {
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Autoconnecting to %s", n->name);
+ outgoing_t *outgoing = xmalloc_and_zero(sizeof *outgoing);
+ outgoing->name = xstrdup(n->name);
+ list_insert_tail(outgoing_list, outgoing);
+ setup_outgoing_connection(outgoing);
+ }
+ break;
+ }
+ } else if(nc > autoconnect) {
+ /* Too many active connections, try to remove one.
+ Choose a random outgoing connection to a node
+ that has at least one other connection.
+ */
+ int r = rand() % nc;
+ int i = 0;
+
+ for list_each(connection_t, c, connection_list) {
+ if(!c->status.active || c->status.control)
+ continue;
+
+ if(i++ != r)
+ continue;
+
+ if(!c->outgoing || !c->node || c->node->edge_tree->count < 2)
+ break;
+
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Autodisconnecting from %s", c->name);
+ list_delete(outgoing_list, c->outgoing);
+ c->outgoing = NULL;
+ terminate_connection(c, c->status.active);
+ break;
+ }
+ }
+
+ if(nc >= autoconnect) {
+ /* If we have enough active connections,
+ remove any pending outgoing connections.
+ */
+ for list_each(outgoing_t, o, outgoing_list) {
+ bool found = false;
+ for list_each(connection_t, c, connection_list) {
+ if(c->outgoing == o) {
+ found = true;
+ break;
+ }
+ }
+ if(!found) {
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Cancelled outgoing connection to %s", o->name);
+ list_delete_node(outgoing_list, node);
}
}
}
}
+
+ event_add(event, &(struct timeval){5, rand() % 100000});
}
-void handle_meta_connection_data(int fd, short events, void *data)
-{
+void handle_meta_connection_data(int fd, short events, 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)
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);
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(result));
+ terminate_connection(c, false);
return;
}
}
}
}
-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;
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
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;
- }
-}
-
-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 sighup_handler(int signal, short events, void *data) {
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
+ reopenlogger();
+ reload_configuration();
}
-static void sigwinch_handler(int signal, short events, void *data) {
- logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
- purge();
+static void sigalrm_handler(int signal, short events, void *data) {
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
+ retry();
}
-static void sighup_handler(int signal, short events, void *data) {
- connection_t *c;
- avl_node_t *node;
+int reload_configuration(void) {
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;
}
- /* 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;
+ 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();
+
+ /* If StrictSubnet is set, expire deleted Subnets and read new ones in */
+
+ if(strictsubnets) {
+ for splay_each(subnet_t, subnet, subnet_tree)
+ subnet->expires = 1;
+
+ load_all_subnets();
+
+ for splay_each(subnet_t, subnet, subnet_tree) {
+ 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 */
+ for splay_each(subnet_t, subnet, myself->subnet_tree)
+ if(!subnet->expires)
+ subnet->expires = 1;
+
+ config_t *cfg = lookup_config(config_tree, "Subnet");
+
+ while(cfg) {
+ subnet_t *subnet, *s2;
+
+ if(!get_config_subnet(cfg, &subnet))
+ continue;
+
+ if((s2 = lookup_subnet(myself, subnet))) {
+ if(s2->expires == 1)
+ s2->expires = 0;
+
+ free_subnet(subnet);
+ } else {
+ subnet_add(myself, subnet);
+ send_add_subnet(everyone, subnet);
+ subnet_update(myself, subnet, true);
+ }
+
+ cfg = lookup_config_next(config_tree, cfg);
+ }
+
+ for splay_each(subnet_t, subnet, myself->subnet_tree) {
+ if(subnet->expires == 1) {
+ send_del_subnet(everyone, subnet);
+ subnet_update(myself, subnet, false);
+ subnet_del(myself, subnet);
+ }
}
-
- asprintf(&fname, "%s/hosts/%s", confbase, c->name);
- if(stat(fname, &s) || s.st_mtime > last_config_check)
+ }
+
+ /* Try to make outgoing connections */
+
+ try_outgoing_connections();
+
+ /* Close connections to hosts that have a changed or deleted host config file */
+
+ for list_each(connection_t, c, connection_list) {
+ if(c->status.control)
+ continue;
+
+ xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, c->name);
+ struct stat s;
+ if(stat(fname, &s) || s.st_mtime > last_config_check) {
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Host config file of %s has been changed", c->name);
terminate_connection(c, c->status.active);
+ }
free(fname);
}
last_config_check = time(NULL);
- /* Try to make outgoing connections */
-
- try_outgoing_connections();
+ return 0;
}
-static void sigalrm_handler(int signal, short events, void *data) {
- logger(LOG_NOTICE, _("Got %s signal"), strsignal(signal));
-
- connection_t *c;
- avl_node_t *node;
-
- for(node = connection_tree->head; node; node = node->next) {
- c = node->data;
-
+void retry(void) {
+ for list_each(connection_t, c, connection_list) {
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);
+ terminate_connection(c, c->status.active);
}
}
}
/*
this is where it all happens...
*/
-int main_loop(void)
-{
- struct timeval tv;
- int r;
- time_t last_ping_check;
- struct event timeout;
+int main_loop(void) {
+ struct event timeout_event;
+ struct event periodic_event;
+
+ timeout_set(&timeout_event, timeout_handler, &timeout_event);
+ event_add(&timeout_event, &(struct timeval){pingtimeout, rand() % 100000});
+
+ timeout_set(&periodic_event, periodic_handler, &periodic_event);
+ event_add(&periodic_event, &(struct timeval){5, rand() % 100000});
+
+#ifndef HAVE_MINGW
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();
-
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);
+#endif
- last_ping_check = time(NULL);
-
- srand(time(NULL));
-
- running = true;
-
- while(running) {
- tv.tv_sec = 1;
- tv.tv_usec = 0;
-
- /* XXX: libevent transition: old timeout code in this loop */
- timeout_set(&timeout, dummy, NULL);
- timeout_add(&timeout, &tv);
-
- r = build_fdset();
- if(r < 0) {
- logger(LOG_ERR, _("Error building fdset: %s"), strerror(errno));
- cp_trace();
- dump_connections();
- return 1;
- }
-
- r = event_loop(EVLOOP_ONCE);
- if(r < 0) {
- logger(LOG_ERR, _("Error while waiting for input: %s"),
- strerror(errno));
- cp_trace();
- dump_connections();
- return 1;
- }
-
- /* XXX: more libevent transition */
- timeout_del(&timeout);
-
- /* Let's check if everybody is still alive */
-
- if(last_ping_check + pingtimeout < time(NULL)) {
- check_dead_connections();
- last_ping_check = time(NULL);
- }
+ if(event_loop(0) < 0) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error while waiting for input: %s", strerror(errno));
+ return 1;
}
+#ifndef HAVE_MINGW
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);
+#endif
+
+ event_del(&timeout_event);
return 0;
}