/*
net.c -- most of the network code
- Copyright (C) 1998-2003 Ivo Timmermans <ivo@o2w.nl>,
- 2000-2003 Guus Sliepen <guus@sliepen.eu.org>
+ Copyright (C) 1998-2005 Ivo Timmermans,
+ 2000-2015 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: net.c,v 1.35.4.195 2003/07/29 22:59:00 guus Exp $
+ 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 "xalloc.h"
bool do_purge = false;
+volatile bool running = false;
+#ifdef HAVE_PSELECT
+bool graph_dump = false;
+#endif
time_t now = 0;
+int contradicting_add_edge = 0;
+int contradicting_del_edge = 0;
+static int sleeptime = 10;
/* Purge edges and subnets of unreachable nodes. Use carefully. */
-static void purge(void)
-{
+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");
- 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) {
- ifdebug(SCARY_THINGS) logger(LOG_DEBUG, _("Purging node %s (%s)"), n->name,
- n->hostname);
+ 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);
- subnet_del(n, s);
+ s = snode->data;
+ send_del_subnet(everyone, s);
+
+ if(!strictsubnets) {
+ 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(everyone, e);
+ }
+
edge_del(e);
}
+ }
+ }
+
+ /* Check if anyone else claims to have an edge to an unreachable node. If not, delete node. */
- node_del(n);
+ 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;
+ }
+ }
+
+ 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 * fs)
-{
+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(fs);
+ FD_ZERO(readset);
+ FD_ZERO(writeset);
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)
+
+ if(!connection_tree->head) {
purge();
+ }
} else {
- FD_SET(c->socket, fs);
- if(c->socket > max)
+ FD_SET(c->socket, readset);
+
+ if(c->outbuflen > 0 || c->status.connecting) {
+ 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, fs);
- if(listen_socket[i].tcp > max)
+ FD_SET(listen_socket[i].tcp, readset);
+
+ if(listen_socket[i].tcp > max) {
max = listen_socket[i].tcp;
- FD_SET(listen_socket[i].udp, fs);
- if(listen_socket[i].udp > max)
+ }
+
+ FD_SET(listen_socket[i].udp, readset);
+
+ if(listen_socket[i].udp > max) {
max = listen_socket[i].udp;
+ }
}
- FD_SET(device_fd, fs);
- if(device_fd > max)
+ if(device_fd >= 0) {
+ FD_SET(device_fd, readset);
+ }
+
+ if(device_fd > max) {
max = device_fd;
-
+ }
+
return max;
}
- 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)
+void terminate_connection(connection_t *c, bool report) {
+ if(c->status.remove) {
return;
+ }
- ifdebug(CONNECTIONS) logger(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 = NULL;
+ }
- if(c->socket)
+ if(c->socket) {
closesocket(c->socket);
+ }
if(c->edge) {
- if(report)
- send_del_edge(broadcast, c->edge);
+ if(!c->node) {
+ logger(LOG_ERR, "Connection to %s (%s) has an edge but node is NULL!", c->name, c->hostname);
+ // And that should never happen.
+ abort();
+ }
+
+ if(report && !tunnelserver) {
+ send_del_edge(everyone, 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(everyone, e);
+ }
+
+ edge_del(e);
+ }
+ }
}
+ free_connection_partially(c);
+
/* Check if this was our outgoing connection */
if(c->outgoing) {
- retry_outgoing(c->outgoing);
- c->outgoing = NULL;
+ c->status.remove = false;
+ do_outgoing_connection(c);
}
+
+#ifndef HAVE_MINGW
+ /* Clean up dead proxy processes */
+
+ while(waitpid(-1, NULL, WNOHANG) > 0);
+
+#endif
}
/*
end does not reply in time, we consider them dead
and close the connection.
*/
-static void check_dead_connections(void)
-{
+static void check_dead_connections(void) {
avl_node_t *node, *next;
connection_t *c;
- 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->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"),
- c->name, c->hostname);
+ ifdebug(CONNECTIONS) logger(LOG_INFO, "%s (%s) didn't respond to PING in %ld seconds",
+ c->name, c->hostname, (long)(now - c->last_ping_time));
c->status.timeout = true;
terminate_connection(c, true);
- } else {
+ } 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, *(uint32_t *)&c->status);
+ 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);
- terminate_connection(c, false);
+
+ 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(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, (long)(now - c->last_flushed_time), c->outbuflen);
+ c->status.timeout = true;
+ terminate_connection(c, true);
}
}
}
check all connections to see if anything
happened on their sockets
*/
-static void check_network_activity(fd_set * f)
-{
+static void check_network_activity(fd_set *readset, fd_set *writeset) {
connection_t *c;
avl_node_t *node;
int result, i;
- int len = sizeof(result);
+ socklen_t len = sizeof(result);
vpn_packet_t packet;
+ static int errors = 0;
+
+ /* check input from kernel */
+ if(device_fd >= 0 && FD_ISSET(device_fd, readset)) {
+ if(devops.read(&packet)) {
+ if(packet.len) {
+ errors = 0;
+ packet.priority = 0;
+ route(myself, &packet);
+ }
+ } else {
+ usleep(errors * 50000);
+ errors++;
- cp();
-
- if(FD_ISSET(device_fd, f)) {
- if(read_packet(&packet))
- route_outgoing(&packet);
+ if(errors > 10) {
+ logger(LOG_ERR, "Too many errors from %s, exiting!", device);
+ running = false;
+ }
+ }
}
+ /* check meta connections */
for(node = connection_tree->head; node; node = node->next) {
- c = (connection_t *) node->data;
+ c = node->data;
- if(c->status.remove)
+ if(c->status.remove) {
continue;
+ }
- if(FD_ISSET(c->socket, f)) {
+ if(FD_ISSET(c->socket, writeset)) {
if(c->status.connecting) {
c->status.connecting = false;
- getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, (void *)&result, &len);
- if(!result)
+ if(!result) {
finish_connecting(c);
- else {
+ } else {
ifdebug(CONNECTIONS) logger(LOG_DEBUG,
- _("Error while connecting to %s (%s): %s"),
- c->name, c->hostname, strerror(result));
+ "Error while connecting to %s (%s): %s",
+ c->name, c->hostname, sockstrerror(result));
closesocket(c->socket);
do_outgoing_connection(c);
continue;
}
}
+ if(!flush_meta(c)) {
+ terminate_connection(c, c->status.active);
+ continue;
+ }
+ }
+
+ if(FD_ISSET(c->socket, readset)) {
if(!receive_meta(c)) {
terminate_connection(c, c->status.active);
continue;
}
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].udp, readset)) {
+ handle_incoming_vpn_data(i);
+ }
- if(FD_ISSET(listen_socket[i].tcp, f))
+ if(FD_ISSET(listen_socket[i].tcp, readset)) {
handle_new_meta_connection(listen_socket[i].tcp);
+ }
}
}
/*
this is where it all happens...
*/
-void main_loop(void)
-{
- fd_set fset;
+int main_loop(void) {
+ fd_set readset, writeset;
+#ifdef HAVE_PSELECT
+ struct timespec tv;
+ sigset_t omask, block_mask;
+ time_t next_event;
+#else
struct timeval tv;
+#endif
int r, maxfd;
- time_t last_ping_check, last_config_check;
+ 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);
- for(;;) {
- now = time(NULL);
+#ifdef HAVE_PSELECT
- tv.tv_sec = 1 + (rand() & 7); /* Approx. 5 seconds, randomized to prevent global synchronisation effects */
- tv.tv_usec = 0;
+ if(lookup_config(config_tree, "GraphDumpFile")) {
+ graph_dump = true;
+ }
+
+ /* Block SIGHUP & SIGALRM */
+ sigemptyset(&block_mask);
+ sigaddset(&block_mask, SIGHUP);
+ sigaddset(&block_mask, SIGALRM);
+ sigprocmask(SIG_BLOCK, &block_mask, &omask);
+#endif
- maxfd = build_fdset(&fset);
+ running = true;
- r = select(maxfd + 1, &fset, NULL, NULL, &tv);
+ while(running) {
+#ifdef HAVE_PSELECT
+ next_event = last_ping_check + pingtimeout;
+
+ if(graph_dump && next_event > last_graph_dump + 60) {
+ next_event = last_graph_dump + 60;
+ }
+
+ if((event = peek_next_event()) && next_event > event->time) {
+ next_event = event->time;
+ }
+
+ if(next_event <= now) {
+ tv.tv_sec = 0;
+ } else {
+ tv.tv_sec = next_event - now;
+ }
+
+ tv.tv_nsec = 0;
+#else
+ tv.tv_sec = 1;
+ tv.tv_usec = 0;
+#endif
+
+ maxfd = build_fdset(&readset, &writeset);
+
+#ifdef HAVE_MINGW
+ LeaveCriticalSection(&mutex);
+#endif
+#ifdef HAVE_PSELECT
+ r = pselect(maxfd + 1, &readset, &writeset, NULL, &tv, &omask);
+#else
+ r = select(maxfd + 1, &readset, &writeset, NULL, &tv);
+#endif
+ now = time(NULL);
+#ifdef HAVE_MINGW
+ EnterCriticalSection(&mutex);
+#endif
if(r < 0) {
- if(errno != EINTR && errno != EAGAIN) {
- logger(LOG_ERR, _("Error while waiting for input: %s"),
- strerror(errno));
- cp_trace();
+ if(!sockwouldblock(sockerrno)) {
+ logger(LOG_ERR, "Error while waiting for input: %s", sockstrerror(sockerrno));
dump_connections();
- return;
+ return 1;
}
-
- continue;
}
- check_network_activity(&fset);
+ if(r > 0) {
+ check_network_activity(&readset, &writeset);
+ }
if(do_purge) {
purge();
/* Let's check if everybody is still alive */
- if(last_ping_check + pingtimeout < now) {
+ if(last_ping_check + pingtimeout <= now) {
check_dead_connections();
last_ping_check = now;
- if(routing_mode == RMODE_SWITCH)
- age_mac();
+ if(routing_mode == RMODE_SWITCH) {
+ age_subnets();
+ }
age_past_requests();
/* Should we regenerate our key? */
- if(keyexpires < now) {
- ifdebug(STATUS) logger(LOG_INFO, _("Regenerating symmetric key"));
+ if(keyexpires <= now) {
+ avl_node_t *node;
+ node_t *n;
+
+ ifdebug(STATUS) logger(LOG_INFO, "Expiring symmetric keys");
+
+ for(node = node_tree->head; node; node = node->next) {
+ n = node->data;
+
+ if(n->inkey) {
+ free(n->inkey);
+ n->inkey = NULL;
+ }
+ }
- RAND_pseudo_bytes(myself->key, myself->keylength);
- if(myself->cipher)
- EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, myself->key + myself->cipher->key_len);
- send_key_changed(broadcast, myself);
+ send_key_changed();
keyexpires = now + keylifetime;
}
- }
+ /* Detect ADD_EDGE/DEL_EDGE storms that are caused when
+ * two tinc daemons with the same name are on the VPN.
+ * If so, sleep a while. If this happens multiple times
+ * in a row, sleep longer. */
- while((event = get_expired_event())) {
- event->handler(event->data);
- free(event);
+ if(contradicting_del_edge > 100 && contradicting_add_edge > 100) {
+ logger(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(sigalrm) {
- logger(LOG_INFO, _("Flushing event queue"));
+ avl_node_t *node;
+ logger(LOG_INFO, "Flushing event queue");
+ expire_events();
- while(event_tree->head) {
- event = (event_t *) event_tree->head->data;
- event->handler(event->data);
- event_del(event);
+ for(node = connection_tree->head; node; node = node->next) {
+ connection_t *c = node->data;
+
+ if(c->status.active) {
+ send_ping(c);
+ }
}
+
sigalrm = false;
}
+ while((event = get_expired_event())) {
+ event->handler(event->data);
+ free_event(event);
+ }
+
if(sighup) {
connection_t *c;
- avl_node_t *node;
+ avl_node_t *node, *next;
char *fname;
struct stat s;
-
+
sighup = false;
-
+
+ reopenlogger();
+
/* 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."));
- exit(1);
+ logger(LOG_ERR, "Unable to reread configuration file, exitting.");
+ return 1;
}
+ /* Cancel non-active outgoing connections */
+
+ for(node = connection_tree->head; node; node = next) {
+ next = node->next;
+ c = node->data;
+
+ c->outgoing = NULL;
+
+ if(c->status.connecting) {
+ terminate_connection(c, false);
+ connection_del(c);
+ }
+ }
+
+ /* Wipe list of outgoing connections */
+
+ for(list_node_t *node = outgoing_list->head; node; node = node->next) {
+ outgoing_t *outgoing = node->data;
+
+ if(outgoing->event) {
+ event_del(outgoing->event);
+ }
+ }
+
+ list_delete_list(outgoing_list);
+
/* 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)
+ 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);
}
last_config_check = now;
+ /* 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);
+ }
+ }
+ }
+ }
+
/* Try to make outgoing connections */
-
+
try_outgoing_connections();
-
- continue;
+ }
+
+ /* Dump graph if wanted every 60 seconds*/
+
+ if(last_graph_dump + 60 <= now) {
+ dump_graph();
+ last_graph_dump = now;
}
}
+
+#ifdef HAVE_PSELECT
+ /* Restore SIGHUP & SIGALARM mask */
+ sigprocmask(SIG_SETMASK, &omask, NULL);
+#endif
+
+ return 0;
}
projects / tinc / blobdiff