/*
net.c -- most of the network code
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2009 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 "event.h"
#include "graph.h"
#include "logger.h"
#include "meta.h"
#include "netutl.h"
#include "process.h"
#include "protocol.h"
-#include "route.h"
#include "subnet.h"
#include "xalloc.h"
-bool do_purge = false;
-volatile bool running = false;
-
-time_t now = 0;
+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;
+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"));
+ 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);
}
}
}
-/*
- put all file descriptors in an fd_set array
- While we're at it, purge stuff that needs to be removed.
-*/
-static int build_fdset(fd_set *readset, fd_set *writeset)
-{
- avl_node_t *node, *next;
- connection_t *c;
- int i, max = 0;
-
- cp();
-
- FD_ZERO(readset);
- FD_ZERO(writeset);
-
- 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();
- } else {
- FD_SET(c->socket, readset);
- if(c->outbuflen > 0)
- FD_SET(c->socket, writeset);
- if(c->socket > max)
- max = c->socket;
- }
- }
-
- for(i = 0; i < listen_sockets; i++) {
- FD_SET(listen_socket[i].tcp, readset);
- if(listen_socket[i].tcp > max)
- max = listen_socket[i].tcp;
- FD_SET(listen_socket[i].udp, readset);
- if(listen_socket[i].udp > max)
- max = listen_socket[i].udp;
- }
-
- FD_SET(device_fd, readset);
- if(device_fd > max)
- max = device_fd;
-
- return max;
-}
-
/*
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();
+void terminate_connection(connection_t *c, bool report) {
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Closing connection with %s (%s)", c->name, c->hostname);
- if(c->status.remove)
- return;
-
- 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);
-
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;
-
- cp();
+static void timeout_handler(int fd, short events, void *event) {
+ time_t now = time(NULL);
- for(node = connection_tree->head; node; node = next) {
+ for(list_node_t *node = connection_list->head, *next; node; node = next) {
next = node->next;
- c = node->data;
+ connection_t *c = node->data;
+
+ if(c->status.control)
+ continue;
- 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);
- }
- } else {
- if(c->status.remove) {
- logger(LOG_WARNING, _("Old connection_t for %s (%s) status %04x still lingering, deleting..."),
- c->name, c->hostname, bitfield_to_int(&c->status, sizeof c->status));
- connection_del(c);
continue;
- }
- 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);
+ continue;
}
+ } else {
+ 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);
}
- }
-
- if(c->outbuflen > 0 && c->last_flushed_time + pingtimeout < now) {
- if(c->status.active) {
- ifdebug(CONNECTIONS) logger(LOG_INFO,
- _("%s (%s) could not flush for %ld seconds (%d bytes remaining)"),
- c->name, c->hostname, now - c->last_flushed_time, c->outbuflen);
- c->status.timeout = true;
- terminate_connection(c, true);
- }
+ terminate_connection(c, c->status.active);
}
}
-}
-/*
- check all connections to see if anything
- happened on their sockets
-*/
-static void check_network_activity(fd_set * readset, fd_set * writeset)
-{
- connection_t *c;
- avl_node_t *node;
- int result, i;
- socklen_t len = sizeof(result);
- vpn_packet_t packet;
-
- cp();
-
- /* check input from kernel */
- if(FD_ISSET(device_fd, readset)) {
- if(read_packet(&packet)) {
- packet.priority = 0;
- route(myself, &packet);
- }
+ 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;
}
- /* check meta connections */
- for(node = connection_tree->head; node; node = node->next) {
- c = node->data;
+ contradicting_add_edge = 0;
+ contradicting_del_edge = 0;
- if(c->status.remove)
- continue;
+ event_add(event, &(struct timeval){pingtimeout, 0});
+}
- if(FD_ISSET(c->socket, readset)) {
- 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));
- closesocket(c->socket);
- do_outgoing_connection(c);
- continue;
- }
- }
+void handle_meta_connection_data(int fd, short events, void *data) {
+ connection_t *c = data;
+ int result;
+ socklen_t len = sizeof result;
- if(!receive_meta(c)) {
- terminate_connection(c, c->status.active);
- continue;
- }
- }
+ if(c->status.connecting) {
+ c->status.connecting = false;
- if(FD_ISSET(c->socket, writeset)) {
- if(!flush_meta(c)) {
- terminate_connection(c, c->status.active);
- continue;
- }
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
+
+ if(!result)
+ finish_connecting(c);
+ else {
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Error while connecting to %s (%s): %s", c->name, c->hostname, sockstrerror(result));
+ terminate_connection(c, false);
+ return;
}
}
- for(i = 0; i < listen_sockets; i++) {
- if(FD_ISSET(listen_socket[i].udp, readset))
- handle_incoming_vpn_data(listen_socket[i].udp);
-
- if(FD_ISSET(listen_socket[i].tcp, readset))
- 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...
-*/
-int main_loop(void)
-{
- fd_set readset, writeset;
- struct timeval tv;
- int r, maxfd;
- time_t last_ping_check, last_config_check, last_graph_dump;
- event_t *event;
-
- cp();
-
- last_ping_check = now;
- last_config_check = now;
- last_graph_dump = now;
-
- srand(now);
+static void sigterm_handler(int signal, short events, void *data) {
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
+ event_loopexit(NULL);
+}
- running = true;
+static void sighup_handler(int signal, short events, void *data) {
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
+ reopenlogger();
+ reload_configuration();
+}
- while(running) {
- now = time(NULL);
+static void sigalrm_handler(int signal, short events, void *data) {
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
+ retry();
+}
- // tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */
- tv.tv_sec = 1;
- tv.tv_usec = 0;
+int reload_configuration(void) {
+ char *fname;
- maxfd = build_fdset(&readset, &writeset);
+ /* Reread our own configuration file */
- r = select(maxfd + 1, &readset, &writeset, NULL, &tv);
+ exit_configuration(&config_tree);
+ init_configuration(&config_tree);
- if(r < 0) {
- if(errno != EINTR && errno != EAGAIN) {
- logger(LOG_ERR, _("Error while waiting for input: %s"),
- strerror(errno));
- cp_trace();
- dump_connections();
- return 1;
- }
+ if(!read_server_config()) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reread configuration file, exitting.");
+ event_loopexit(NULL);
+ return EINVAL;
+ }
- continue;
- }
+ read_config_options(config_tree, NULL);
- check_network_activity(&readset, &writeset);
+ xasprintf(&fname, "%s" SLASH "hosts" SLASH "%s", confbase, myself->name);
+ read_config_file(config_tree, fname);
+ free(fname);
- if(do_purge) {
- purge();
- do_purge = false;
- }
+ /* Parse some options that are allowed to be changed while tinc is running */
- /* Let's check if everybody is still alive */
+ setup_myself_reloadable();
- if(last_ping_check + pingtimeout < now) {
- check_dead_connections();
- last_ping_check = now;
+ /* If StrictSubnet is set, expire deleted Subnets and read new ones in */
- if(routing_mode == RMODE_SWITCH)
- age_subnets();
+ if(strictsubnets) {
+ for(splay_node_t *node = subnet_tree->head; node; node = node->next) {
+ subnet_t *subnet = node->data;
+ subnet->expires = 1;
+ }
- age_past_requests();
+ load_all_subnets();
+
+ for(splay_node_t *node = subnet_tree->head, *next; node; node = next) {
+ next = node->next;
+ subnet_t *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 */
+ for(splay_node_t *node = myself->subnet_tree->head; node; node = node->next) {
+ subnet_t *subnet = node->data;
+ if(!subnet->expires)
+ subnet->expires = 1;
+ }
- /* Should we regenerate our key? */
+ config_t *cfg = lookup_config(config_tree, "Subnet");
- if(keyexpires < now) {
- avl_node_t *node;
- node_t *n;
+ while(cfg) {
+ subnet_t *subnet, *s2;
- ifdebug(STATUS) logger(LOG_INFO, _("Expiring symmetric keys"));
+ if(!get_config_subnet(cfg, &subnet))
+ continue;
- for(node = node_tree->head; node; node = node->next) {
- n = node->data;
- if(n->inkey) {
- free(n->inkey);
- n->inkey = NULL;
- }
- }
+ if((s2 = lookup_subnet(myself, subnet))) {
+ if(s2->expires == 1)
+ s2->expires = 0;
- send_key_changed(broadcast, myself);
- keyexpires = now + keylifetime;
+ free_subnet(subnet);
+ } else {
+ subnet_add(myself, subnet);
+ send_add_subnet(everyone, subnet);
+ subnet_update(myself, subnet, true);
}
- }
- if(sigalrm) {
- logger(LOG_INFO, _("Flushing event queue"));
- expire_events();
- sigalrm = false;
+ cfg = lookup_config_next(config_tree, cfg);
}
- while((event = get_expired_event())) {
- event->handler(event->data);
- free_event(event);
+ for(splay_node_t *node = myself->subnet_tree->head, *next; node; node = next) {
+ next = node->next;
+ subnet_t *subnet = node->data;
+ if(subnet->expires == 1) {
+ send_del_subnet(everyone, subnet);
+ subnet_update(myself, subnet, false);
+ subnet_del(myself, subnet);
+ }
}
+ }
- if(sighup) {
- connection_t *c;
- avl_node_t *node;
- char *fname;
- struct stat s;
-
- sighup = false;
-
- /* Reread our own configuration file */
-
- exit_configuration(&config_tree);
- init_configuration(&config_tree);
-
- if(!read_server_config()) {
- logger(LOG_ERR, _("Unable to reread configuration file, exitting."));
- return 1;
- }
+ /* Try to make outgoing connections */
+
+ try_outgoing_connections();
- /* 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;
-
- 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);
- }
+ /* Close connections to hosts that have a changed or deleted host config file */
- last_config_check = now;
+ for(list_node_t *node = connection_list->head, *next; node; node = next) {
+ connection_t *c = node->data;
+ next = node->next;
- /* Try to make outgoing connections */
-
- try_outgoing_connections();
+ 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);
}
-
- /* Dump graph if wanted every 60 seconds*/
+ free(fname);
+ }
+
+ last_config_check = time(NULL);
- if(last_graph_dump + 60 < now) {
- dump_graph();
- last_graph_dump = now;
+ return 0;
+}
+
+void retry(void) {
+ for(list_node_t *node = connection_list->head, *next; node; node = next) {
+ next = node->next;
+ connection_t *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;
+ terminate_connection(c, c->status.active);
}
}
+}
+
+/*
+ this is where it all happens...
+*/
+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;
+
+ 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(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;
}
projects / tinc / blobdiff