/*
net.c -- most of the network code
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2011 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2015 Guus Sliepen <guus@tinc-vpn.org>
2006 Scott Lamb <slamb@slamb.org>
- 2011 Loïc Grenié <loic.grenie@gmail.com>
+ 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
if(!n->status.reachable) {
ifdebug(SCARY_THINGS) logger(LOG_DEBUG, "Purging node %s (%s)", n->name,
- n->hostname);
+ n->hostname);
for(snode = n->subnet_tree->head; snode; snode = snext) {
snext = snode->next;
s = snode->data;
- send_del_subnet(broadcast, s);
- if(!strictsubnets)
+ 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);
+
+ if(!tunnelserver) {
+ send_del_edge(everyone, e);
+ }
+
edge_del(e);
}
}
enext = enode->next;
e = enode->data;
- if(e->to == n)
+ if(e->to == n) {
break;
+ }
}
if(!enode && (!strictsubnets || !n->subnet_tree->head))
/* in strictsubnets mode do not delete nodes with subnets */
+ {
node_del(n);
+ }
}
}
}
if(c->status.remove) {
connection_del(c);
- if(!connection_tree->head)
+
+ if(!connection_tree->head) {
purge();
+ }
} else {
FD_SET(c->socket, readset);
- if(c->outbuflen > 0)
+
+ if(c->outbuflen > 0 || c->status.connecting) {
FD_SET(c->socket, writeset);
- if(c->socket > max)
+ }
+
+ 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)
+
+ if(listen_socket[i].tcp > max) {
max = listen_socket[i].tcp;
+ }
+
FD_SET(listen_socket[i].udp, readset);
- if(listen_socket[i].udp > max)
+
+ if(listen_socket[i].udp > max) {
max = listen_socket[i].udp;
+ }
}
- if(device_fd >= 0)
+ if(device_fd >= 0) {
FD_SET(device_fd, readset);
- if(device_fd > max)
+ }
+
+ if(device_fd > max) {
max = device_fd;
-
+ }
+
return max;
}
+/* Put a misbehaving connection in the tarpit */
+void tarpit(int fd) {
+ static int pits[10] = {-1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
+ static int next_pit = 0;
+
+ if(pits[next_pit] != -1) {
+ closesocket(pits[next_pit]);
+ }
+
+ pits[next_pit++] = fd;
+
+ if(next_pit >= (int)(sizeof pits / sizeof pits[0])) {
+ next_pit = 0;
+ }
+}
+
/*
Terminate a connection:
- Close the socket
- Deactivate the host
*/
void terminate_connection(connection_t *c, bool report) {
- if(c->status.remove)
+ if(c->status.remove) {
return;
+ }
ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Closing connection with %s (%s)",
- c->name, c->hostname);
+ 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)
- closesocket(c->socket);
+ if(c->socket) {
+ if(c->status.tarpit) {
+ tarpit(c->socket);
+ } else {
+ closesocket(c->socket);
+ }
+ }
if(c->edge) {
- if(report && !tunnelserver)
- 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);
+ c->edge = NULL;
/* Run MST and SSSP algorithms */
if(report && !c->node->status.reachable) {
edge_t *e;
e = lookup_edge(c->node, myself);
+
if(e) {
- if(!tunnelserver)
- send_del_edge(broadcast, 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);
}
- free(c->outbuf);
- c->outbuf = NULL;
- c->outbuflen = 0;
- c->outbufsize = 0;
- c->outbufstart = 0;
+#ifndef HAVE_MINGW
+ /* Clean up dead proxy processes */
+
+ while(waitpid(-1, NULL, WNOHANG) > 0);
+
+#endif
}
/*
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->name, c->hostname, (long)(now - c->last_ping_time));
c->status.timeout = true;
terminate_connection(c, true);
} else if(c->last_ping_time + pinginterval <= now) {
} 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));
+ 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);
+ c->name, c->hostname);
+
if(c->status.connecting) {
c->status.connecting = false;
closesocket(c->socket);
do_outgoing_connection(c);
} else {
+ c->status.tarpit = true;
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, now - c->last_flushed_time, c->outbuflen);
+ "%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 * readset, fd_set * writeset) {
+static void check_network_activity(fd_set *readset, fd_set *writeset) {
connection_t *c;
avl_node_t *node;
int result, i;
/* check input from kernel */
if(device_fd >= 0 && FD_ISSET(device_fd, readset)) {
- if(read_packet(&packet)) {
- errors = 0;
- packet.priority = 0;
- route(myself, &packet);
+ if(devops.read(&packet)) {
+ if(packet.len) {
+ errors = 0;
+ packet.priority = 0;
+ route(myself, &packet);
+ }
} else {
usleep(errors * 50000);
errors++;
+
if(errors > 10) {
logger(LOG_ERR, "Too many errors from %s, exiting!", device);
running = false;
for(node = connection_tree->head; node; node = node->next) {
c = node->data;
- if(c->status.remove)
+ if(c->status.remove) {
continue;
+ }
- if(FD_ISSET(c->socket, readset)) {
+ if(FD_ISSET(c->socket, writeset)) {
if(c->status.connecting) {
c->status.connecting = false;
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, sockstrerror(result));
+ "Error while connecting to %s (%s): %s",
+ c->name, c->hostname, sockstrerror(result));
closesocket(c->socket);
do_outgoing_connection(c);
continue;
}
}
- if(!receive_meta(c)) {
+ if(!flush_meta(c)) {
terminate_connection(c, c->status.active);
continue;
}
}
- if(FD_ISSET(c->socket, writeset)) {
- if(!flush_meta(c)) {
+ if(FD_ISSET(c->socket, readset)) {
+ if(!receive_meta(c)) {
+ c->status.tarpit = true;
terminate_connection(c, c->status.active);
continue;
}
}
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].udp, readset)) {
+ handle_incoming_vpn_data(i);
+ }
- if(FD_ISSET(listen_socket[i].tcp, readset))
+ if(FD_ISSET(listen_socket[i].tcp, readset)) {
handle_new_meta_connection(listen_socket[i].tcp);
+ }
}
}
last_ping_check = now;
last_config_check = now;
last_graph_dump = now;
-
+
srand(now);
#ifdef HAVE_PSELECT
- if(lookup_config(config_tree, "GraphDumpFile"))
+
+ if(lookup_config(config_tree, "GraphDumpFile")) {
graph_dump = true;
+ }
+
/* Block SIGHUP & SIGALRM */
sigemptyset(&block_mask);
sigaddset(&block_mask, SIGHUP);
while(running) {
#ifdef HAVE_PSELECT
next_event = last_ping_check + pingtimeout;
- if(graph_dump && next_event > last_graph_dump + 60)
+
+ if(graph_dump && next_event > last_graph_dump + 60) {
next_event = last_graph_dump + 60;
+ }
- if((event = peek_next_event()) && next_event > event->time)
+ if((event = peek_next_event()) && next_event > event->time) {
next_event = event->time;
+ }
- if(next_event <= now)
+ if(next_event <= now) {
tv.tv_sec = 0;
- else
+ } else {
tv.tv_sec = next_event - now;
+ }
+
tv.tv_nsec = 0;
#else
tv.tv_sec = 1;
}
}
- if(r > 0)
+ if(r > 0) {
check_network_activity(&readset, &writeset);
+ }
if(do_purge) {
purge();
check_dead_connections();
last_ping_check = now;
- if(routing_mode == RMODE_SWITCH)
+ if(routing_mode == RMODE_SWITCH) {
age_subnets();
+ }
age_past_requests();
for(node = node_tree->head; node; node = node->next) {
n = node->data;
+
if(n->inkey) {
free(n->inkey);
n->inkey = NULL;
if(contradicting_del_edge > 100 && contradicting_add_edge > 100) {
logger(LOG_WARNING, "Possible node with same Name as us! Sleeping %d seconds.", sleeptime);
- sleep(sleeptime);
+ usleep(sleeptime * 1000000LL);
sleeptime *= 2;
- if(sleeptime < 0)
+
+ if(sleeptime < 0) {
sleeptime = 3600;
+ }
} else {
sleeptime /= 2;
- if(sleeptime < 10)
+
+ if(sleeptime < 10) {
sleeptime = 10;
+ }
}
contradicting_add_edge = 0;
avl_node_t *node;
logger(LOG_INFO, "Flushing event queue");
expire_events();
+
for(node = connection_tree->head; node; node = node->next) {
connection_t *c = node->data;
- send_ping(c);
+
+ if(c->status.active) {
+ send_ping(c);
+ }
}
+
sigalrm = false;
}
avl_node_t *node, *next;
char *fname;
struct stat s;
-
+
sighup = false;
reopenlogger();
-
+
/* Reread our own configuration file */
exit_configuration(&config_tree);
for(list_node_t *node = outgoing_list->head; node; node = node->next) {
outgoing_t *outgoing = node->data;
- if(outgoing->event)
+ 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 = node->data;
-
+
xasprintf(&fname, "%s/hosts/%s", confbase, c->name);
- if(stat(fname, &s) || s.st_mtime > last_config_check)
+
+ if(stat(fname, &s) || s.st_mtime > last_config_check) {
terminate_connection(c, c->status.active);
+ }
+
free(fname);
}
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)
+ 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(broadcast, subnet);
- if(subnet->owner->status.reachable)
+ send_add_subnet(everyone, subnet);
+
+ if(subnet->owner->status.reachable) {
subnet_update(subnet->owner, subnet, true);
+ }
}
}
}
/* Try to make outgoing connections */
-
+
try_outgoing_connections();
}
-
+
/* Dump graph if wanted every 60 seconds*/
if(last_graph_dump + 60 <= now) {
projects / oweals / tinc.git / blobdiff