/*
net.c -- most of the network code
Copyright (C) 1998-2005 Ivo Timmermans,
- 2000-2012 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
#include "system.h"
#include "utils.h"
-#include "splay_tree.h"
#include "conf.h"
#include "connection.h"
#include "device.h"
#include "graph.h"
#include "logger.h"
#include "meta.h"
+#include "names.h"
#include "net.h"
#include "netutl.h"
-#include "process.h"
#include "protocol.h"
#include "subnet.h"
#include "xalloc.h"
int contradicting_add_edge = 0;
int contradicting_del_edge = 0;
static int sleeptime = 10;
+time_t last_config_check = 0;
+static timeout_t pingtimer;
+static timeout_t periodictimer;
/* Purge edges and subnets of unreachable nodes. Use carefully. */
void purge(void) {
- splay_node_t *nnode, *nnext, *enode, *enext, *snode, *snext;
- node_t *n;
- edge_t *e;
- subnet_t *s;
-
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) {
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;
+ 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(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 && (!strictsubnets || !n->subnet_tree->head))
+ if(!autoconnect && (!strictsubnets || !n->subnet_tree->head))
/* in strictsubnets mode do not delete nodes with subnets */
node_del(n);
}
/*
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) {
- logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Closing connection with %s (%s)",
- c->name, c->hostname);
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Closing connection with %s (%s)", c->name, c->hostname);
- c->status.active = false;
-
- if(c->node)
+ if(c->node && c->node->connection == c)
c->node->connection = NULL;
if(c->edge) {
}
}
- free_connection_partially(c);
+ outgoing_t *outgoing = c->outgoing;
+ connection_del(c);
/* Check if this was our outgoing connection */
- if(c->outgoing) {
- do_outgoing_connection(c);
- }
+ if(outgoing)
+ do_outgoing_connection(outgoing);
+
+#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 timeout_handler(int fd, short events, void *event) {
- splay_node_t *node, *next;
- connection_t *c;
- time_t now = time(NULL);
-
- for(node = connection_tree->head; node; node = next) {
- next = node->next;
- c = node->data;
-
+static void timeout_handler(void *data) {
+ for list_each(connection_t, c, connection_list) {
if(c->status.control)
continue;
- if(c->last_ping_time + pingtimeout <= now) {
- if(c->status.active) {
+ if(c->last_ping_time + pingtimeout <= now.tv_sec) {
+ if(c->edge) {
+ try_tx(c->node, false);
if(c->status.pinged) {
- 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);
- terminate_connection(c, true);
- continue;
- } 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.tv_sec - c->last_ping_time));
+ } else if(c->last_ping_time + pinginterval <= now.tv_sec) {
send_ping(c);
+ continue;
+ } else {
+ continue;
}
} else {
- if(c->status.connecting) {
+ if(c->status.connecting)
logger(DEBUG_CONNECTIONS, LOG_WARNING, "Timeout while connecting to %s (%s)", c->name, c->hostname);
- c->status.connecting = false;
- closesocket(c->socket);
- do_outgoing_connection(c);
- } else {
+ else
logger(DEBUG_CONNECTIONS, LOG_WARNING, "Timeout from %s (%s) during authentication", c->name, c->hostname);
- terminate_connection(c, false);
- continue;
- }
}
+ terminate_connection(c, c->edge);
}
+
}
+ timeout_set(data, &(struct timeval){1, rand() % 100000});
+}
+
+static void periodic_handler(void *data) {
+ /* 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);
+ nanosleep(&(struct timespec){sleeptime, 0}, NULL);
sleeptime *= 2;
if(sleeptime < 0)
sleeptime = 3600;
contradicting_add_edge = 0;
contradicting_del_edge = 0;
- event_add(event, &(struct timeval){pingtimeout, 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->edge)
+ nc++;
+ }
+
+ if(nc < 3) {
+ /* 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 - 1);
+ int i = 0;
+
+ for splay_each(node_t, n, node_tree) {
+ if(n == myself)
+ continue;
+
+ 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;
+ }
+ }
+
+ if(!found) {
+ logger(DEBUG_CONNECTIONS, LOG_INFO, "Autoconnecting to %s", n->name);
+ outgoing_t *outgoing = xzalloc(sizeof *outgoing);
+ outgoing->name = xstrdup(n->name);
+ list_insert_tail(outgoing_list, outgoing);
+ setup_outgoing_connection(outgoing);
+ }
+ break;
+ }
+ } else if(nc > 3) {
+ /* 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->edge)
+ 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->edge);
+ break;
+ }
+ }
-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.connecting) {
- c->status.connecting = false;
-
- 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));
- closesocket(c->socket);
- do_outgoing_connection(c);
- return;
+ if(nc >= 3) {
+ /* 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);
+ }
+ }
}
}
+ timeout_set(data, &(struct timeval){5, rand() % 100000});
+}
+
+void handle_meta_connection_data(connection_t *c) {
if (!receive_meta(c)) {
- terminate_connection(c, c->status.active);
+ terminate_connection(c, c->edge);
return;
}
}
-static void sigterm_handler(int signal, short events, void *data) {
- logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
- event_loopexit(NULL);
+#ifndef HAVE_MINGW
+static void sigterm_handler(void *data) {
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum));
+ event_exit();
}
-static void sighup_handler(int signal, short events, void *data) {
- logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
+static void sighup_handler(void *data) {
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum));
reopenlogger();
- reload_configuration();
+ if(reload_configuration())
+ exit(1);
}
-static void sigalrm_handler(int signal, short events, void *data) {
- logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(signal));
+static void sigalrm_handler(void *data) {
+ logger(DEBUG_ALWAYS, LOG_NOTICE, "Got %s signal", strsignal(((signal_t *)data)->signum));
retry();
}
+#endif
int reload_configuration(void) {
- connection_t *c;
- splay_node_t *node, *next;
- char *fname;
- struct stat s;
- static time_t last_config_check = 0;
+ char fname[PATH_MAX];
/* Reread our own configuration file */
init_configuration(&config_tree);
if(!read_server_config()) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reread configuration file, exitting.");
- event_loopexit(NULL);
+ logger(DEBUG_ALWAYS, LOG_ERR, "Unable to reread configuration file.");
return EINVAL;
}
- /* Close connections to hosts that have a changed or deleted host config file */
-
- for(node = connection_tree->head; node; node = next) {
- c = node->data;
- next = node->next;
+ read_config_options(config_tree, NULL);
- if(c->status.control)
- continue;
-
- if(c->outgoing) {
- free(c->outgoing->name);
- if(c->outgoing->ai)
- freeaddrinfo(c->outgoing->ai);
- free(c->outgoing);
- c->outgoing = NULL;
- }
-
- 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);
- }
+ snprintf(fname, sizeof fname, "%s" SLASH "hosts" SLASH "%s", confbase, myself->name);
+ read_config_file(config_tree, fname);
+
+ /* Parse some options that are allowed to be changed while tinc is running */
- last_config_check = time(NULL);
+ setup_myself_reloadable();
/* 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;
- }
+ for splay_each(subnet_t, subnet, subnet_tree)
+ if (subnet->owner)
+ subnet->expires = 1;
load_all_subnets();
- for(node = subnet_tree->head; node; node = next) {
- next = node->next;
- subnet = node->data;
+ for splay_each(subnet_t, subnet, subnet_tree) {
+ if (!subnet->owner)
+ continue;
if(subnet->expires == 1) {
send_del_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);
+ }
+ }
}
/* 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;
+
+ snprintf(fname, sizeof 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->edge);
+ }
+ }
+
+ last_config_check = now.tv_sec;
+
return 0;
}
void retry(void) {
- connection_t *c;
- 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);
- if(c->status.connecting)
- close(c->socket);
- c->outgoing->timeout = 0;
- do_outgoing_connection(c);
- }
+ /* Reset the reconnection timers for all outgoing connections */
+ for list_each(outgoing_t, outgoing, outgoing_list) {
+ outgoing->timeout = 0;
+ if(outgoing->ev.cb)
+ timeout_set(&outgoing->ev, &(struct timeval){0, 0});
+ }
+
+ /* Check for outgoing connections that are in progress, and reset their ping timers */
+ for list_each(connection_t, c, connection_list) {
+ if(c->outgoing && !c->node)
+ c->last_ping_time = 0;
}
+
+ /* Kick the ping timeout handler */
+ timeout_set(&pingtimer, &(struct timeval){0, 0});
}
/*
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});
+ timeout_add(&pingtimer, timeout_handler, &pingtimer, &(struct timeval){pingtimeout, rand() % 100000});
+ timeout_add(&periodictimer, periodic_handler, &periodictimer, &(struct timeval){0, 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);
+ signal_t sighup = {0};
+ signal_t sigterm = {0};
+ signal_t sigquit = {0};
+ signal_t sigint = {0};
+ signal_t sigalrm = {0};
+
+ signal_add(&sighup, sighup_handler, &sighup, SIGHUP);
+ signal_add(&sigterm, sigterm_handler, &sigterm, SIGTERM);
+ signal_add(&sigquit, sigterm_handler, &sigquit, SIGQUIT);
+ signal_add(&sigint, sigterm_handler, &sigint, SIGINT);
+ signal_add(&sigalrm, sigalrm_handler, &sigalrm, SIGALRM);
#endif
- if(event_loop(0) < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, "Error while waiting for input: %s", strerror(errno));
+ if(!event_loop()) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error while waiting for input: %s", sockstrerror(sockerrno));
return 1;
}
#ifndef HAVE_MINGW
- signal_del(&sighup_event);
- signal_del(&sigterm_event);
- signal_del(&sigquit_event);
- signal_del(&sigalrm_event);
+ signal_del(&sighup);
+ signal_del(&sigterm);
+ signal_del(&sigquit);
+ signal_del(&sigint);
+ signal_del(&sigalrm);
#endif
- event_del(&timeout_event);
+ timeout_del(&periodictimer);
+ timeout_del(&pingtimer);
return 0;
}
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