--- /dev/null
+/*
+ net.c -- most of the network code
+ Copyright (C) 1998-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
+ 2000-2002 Guus Sliepen <guus@sliepen.warande.net>
+
+ 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
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ 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 1.1 2002/04/28 12:46:26 zarq Exp $
+*/
+
+#include "config.h"
+
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#ifdef HAVE_LINUX
+ #include <netinet/ip.h>
+ #include <netinet/tcp.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+/* SunOS really wants sys/socket.h BEFORE net/if.h,
+ and FreeBSD wants these lines below the rest. */
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <net/if.h>
+
+#include <openssl/rand.h>
+
+#include <gtk/gtk.h>
+
+#include <utils.h>
+#include <xalloc.h>
+#include <avl_tree.h>
+#include <list.h>
+
+#include "conf.h"
+#include "interface.h"
+#include "connection.h"
+#include "meta.h"
+#include "net.h"
+#include "netutl.h"
+#include "process.h"
+#include "protocol.h"
+#include "subnet.h"
+#include "graph.h"
+#include "process.h"
+#include "route.h"
+#include "device.h"
+#include "event.h"
+#include "logging.h"
+
+#include "system.h"
+
+int do_prune = 0;
+int do_purge = 0;
+int sighup = 0;
+int sigalrm = 0;
+
+time_t now = 0;
+
+/*
+ put all file descriptors in an fd_set array
+*/
+void build_fdset(fd_set *fs)
+{
+ avl_node_t *node;
+ connection_t *c;
+ int i;
+cp
+ FD_ZERO(fs);
+
+ for(node = connection_tree->head; node; node = node->next)
+ {
+ c = (connection_t *)node->data;
+ FD_SET(c->socket, fs);
+ }
+
+ for(i = 0; i < listen_sockets; i++)
+ {
+ FD_SET(listen_socket[i].tcp, fs);
+ FD_SET(listen_socket[i].udp, fs);
+ }
+cp
+}
+
+/* Purge edges and subnets of unreachable nodes. Use carefully. */
+
+void purge(void)
+{
+ avl_node_t *nnode, *nnext, *enode, *enext, *snode, *snext, *cnode;
+ node_t *n;
+ edge_t *e;
+ subnet_t *s;
+ connection_t *c;
+cp
+ log(DEBUG_PROTOCOL, TLOG_DEBUG,
+ _("Purging unreachable nodes"));
+
+ for(nnode = node_tree->head; nnode; nnode = nnext)
+ {
+ nnext = nnode->next;
+ n = (node_t *)nnode->data;
+
+ if(!n->status.reachable)
+ {
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ syslog(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;
+
+ for(cnode = connection_tree->head; cnode; cnode = cnode->next)
+ {
+ c = (connection_t *)cnode->data;
+ if(c->status.active)
+ send_del_subnet(c, s);
+ }
+
+ subnet_del(n, s);
+ }
+
+ for(enode = n->edge_tree->head; enode; enode = enext)
+ {
+ enext = enode->next;
+ e = (edge_t *)enode->data;
+
+ for(cnode = connection_tree->head; cnode; cnode = cnode->next)
+ {
+ c = (connection_t *)cnode->data;
+ if(c->status.active)
+ send_del_edge(c, e);
+ }
+
+ edge_del(e);
+ }
+
+ node_del(n);
+ }
+ }
+cp
+}
+
+/*
+ Terminate a connection:
+ - Close the socket
+ - Remove associated edge and tell other connections about it if report = 1
+ - Check if we need to retry making an outgoing connection
+ - Deactivate the host
+*/
+void terminate_connection(connection_t *c, int report)
+{
+ avl_node_t *node;
+ connection_t *other;
+cp
+ if(c->status.remove)
+ return;
+
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Closing connection with %s (%s)"),
+ c->name, c->hostname);
+
+ c->status.remove = 1;
+
+ if(c->socket)
+ close(c->socket);
+
+ if(c->edge)
+ {
+ if(report)
+ {
+ for(node = connection_tree->head; node; node = node->next)
+ {
+ other = (connection_t *)node->data;
+ if(other->status.active && other != c)
+ send_del_edge(other, c->edge);
+ }
+ }
+
+ edge_del(c->edge);
+
+ /* Run MST and SSSP algorithms */
+
+ graph();
+ }
+
+ /* Check if this was our outgoing connection */
+
+ if(c->outgoing)
+ {
+ retry_outgoing(c->outgoing);
+ c->outgoing = NULL;
+ }
+
+ /* Deactivate */
+
+ c->status.active = 0;
+ if(c->node)
+ c->node->connection = NULL;
+ do_prune = 1;
+cp
+}
+
+/*
+ Check if the other end is active.
+ If we have sent packets, but didn't receive any,
+ then possibly the other end is dead. We send a
+ PING request over the meta connection. If the other
+ end does not reply in time, we consider them dead
+ and close the connection.
+*/
+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;
+ if(c->last_ping_time + pingtimeout < now)
+ {
+ if(c->status.active)
+ {
+ if(c->status.pinged)
+ {
+ if(debug_lvl >= DEBUG_PROTOCOL)
+ syslog(LOG_INFO, _("%s (%s) didn't respond to PING"),
+ c->name, c->hostname);
+ c->status.timeout = 1;
+ terminate_connection(c, 1);
+ }
+ else
+ {
+ send_ping(c);
+ }
+ }
+ else
+ {
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_WARNING, _("Timeout from %s (%s) during authentication"),
+ c->name, c->hostname);
+ terminate_connection(c, 0);
+ }
+ }
+ }
+cp
+}
+
+/*
+ check all connections to see if anything
+ happened on their sockets
+*/
+void check_network_activity(fd_set *f)
+{
+ connection_t *c;
+ avl_node_t *node;
+ int result, i;
+ int len = sizeof(result);
+cp
+ for(i = 0; i < listen_sockets; i++)
+ {
+ if(FD_ISSET(listen_socket[i].tcp, f))
+ handle_new_meta_connection(listen_socket[i].tcp);
+ }
+
+ for(node = connection_tree->head; node; node = node->next)
+ {
+ c = (connection_t *)node->data;
+
+ if(c->status.remove)
+ return;
+
+ if(FD_ISSET(c->socket, f))
+ {
+ if(c->status.connecting)
+ {
+ c->status.connecting = 0;
+ getsockopt(c->socket, SOL_SOCKET, SO_ERROR, &result, &len);
+ if(!result)
+ finish_connecting(c);
+ else
+ {
+ if(debug_lvl >= DEBUG_CONNECTIONS)
+ syslog(LOG_DEBUG, _("Error while connecting to %s (%s): %s"), c->name, c->hostname, strerror(result));
+ close(c->socket);
+ do_outgoing_connection(c);
+ continue;
+ }
+ }
+ if(receive_meta(c) < 0)
+ {
+ terminate_connection(c, c->status.active);
+ return;
+ }
+ }
+ }
+cp
+}
+
+void prune_connections(void)
+{
+ connection_t *c;
+ avl_node_t *node, *next;
+cp
+ for(node = connection_tree->head; node; node = next)
+ {
+ next = node->next;
+ c = (connection_t *)node->data;
+
+ if(c->status.remove)
+ connection_del(c);
+ }
+
+ if(!connection_tree->head)
+ purge();
+cp
+}
+
+/*
+ this is where it all happens...
+*/
+void main_loop(void)
+{
+ fd_set fset;
+ struct timeval tv;
+ int r;
+ time_t last_ping_check;
+ event_t *event;
+cp
+ last_ping_check = now;
+
+ srand(now);
+
+ for(;;)
+ {
+ now = time(NULL);
+
+/* tv.tv_sec = 1 + (rand() & 7); /\* Approx. 5 seconds, randomized to prevent global synchronisation effects *\/ */
+/* tv.tv_usec = 0; */
+ tv.tv_sec = 0;
+ tv.tv_usec = 50000;
+
+ if(do_prune)
+ {
+ prune_connections();
+ do_prune = 0;
+ }
+
+ build_fdset(&fset);
+
+ while(gtk_events_pending())
+ if(gtk_main_iteration() == FALSE)
+ return;
+
+ if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0)
+ {
+ if(errno != EINTR) /* because of a signal */
+ {
+ syslog(LOG_ERR, _("Error while waiting for input: %s"), strerror(errno));
+ return;
+ }
+ }
+
+ if(r > 0)
+ check_network_activity(&fset);
+
+ if(do_purge)
+ {
+ purge();
+ do_purge = 0;
+ }
+
+ /* Let's check if everybody is still alive */
+
+ if(last_ping_check + pingtimeout < now)
+ {
+ check_dead_connections();
+ last_ping_check = now;
+
+ if(routing_mode== RMODE_SWITCH)
+ age_mac();
+
+ age_past_requests();
+
+ /* Should we regenerate our key? */
+
+ if(keyexpires < now)
+ {
+ if(debug_lvl >= DEBUG_STATUS)
+ syslog(LOG_INFO, _("Regenerating symmetric key"));
+
+ RAND_pseudo_bytes(myself->key, myself->keylength);
+ send_key_changed(myself->connection, myself);
+ keyexpires = now + keylifetime;
+ }
+ }
+
+
+ while((event = get_expired_event()))
+ {
+ event->handler(event->data);
+ free(event);
+ }
+
+ if(sigalrm)
+ {
+ syslog(LOG_INFO, _("Flushing event queue"));
+
+ while(event_tree->head)
+ {
+ event = (event_t *)event_tree->head->data;
+ event->handler(event->data);
+ event_del(event);
+ }
+ sigalrm = 0;
+ }
+
+ if(sighup)
+ {
+ sighup = 0;
+ close_network_connections();
+ exit_configuration(&config_tree);
+
+ syslog(LOG_INFO, _("Rereading configuration file and restarting in 5 seconds..."));
+ sleep(5);
+
+ init_configuration(&config_tree);
+
+ if(read_server_config())
+ {
+ syslog(LOG_ERR, _("Unable to reread configuration file, exitting."));
+ exit(1);
+ }
+
+ if(setup_network_connections())
+ return;
+
+ continue;
+ }
+
+ if(build_graph)
+ if_build_graph();
+ }
+cp
+}
projects / tinc / blobdiff