269 lines
6.2 KiB
C
269 lines
6.2 KiB
C
/*
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protocol_edge.c -- handle the meta-protocol, edges
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Copyright (C) 1999-2005 Ivo Timmermans,
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2000-2006 Guus Sliepen <guus@tinc-vpn.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id$
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*/
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#include "system.h"
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#include "avl_tree.h"
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#include "conf.h"
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#include "connection.h"
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#include "edge.h"
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#include "graph.h"
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#include "logger.h"
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#include "meta.h"
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#include "net.h"
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#include "netutl.h"
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#include "node.h"
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#include "protocol.h"
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#include "utils.h"
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#include "xalloc.h"
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bool send_add_edge(connection_t *c, const edge_t *e) {
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bool x;
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char *address, *port;
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cp();
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sockaddr2str(&e->address, &address, &port);
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x = send_request(c, "%d %lx %s %s %s %s %lx %d", ADD_EDGE, random(),
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e->from->name, e->to->name, address, port,
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e->options, e->weight);
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free(address);
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free(port);
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return x;
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}
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bool add_edge_h(connection_t *c) {
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edge_t *e;
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node_t *from, *to;
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char from_name[MAX_STRING_SIZE];
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char to_name[MAX_STRING_SIZE];
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char to_address[MAX_STRING_SIZE];
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char to_port[MAX_STRING_SIZE];
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sockaddr_t address;
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long int options;
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int weight;
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cp();
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if(sscanf(c->buffer, "%*d %*x "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %lx %d",
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from_name, to_name, to_address, to_port, &options, &weight) != 6) {
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logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_EDGE", c->name,
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c->hostname);
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return false;
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}
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/* Check if names are valid */
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if(!check_id(from_name)) {
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logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name,
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c->hostname, _("invalid name"));
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return false;
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}
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if(!check_id(to_name)) {
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logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name,
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c->hostname, _("invalid name"));
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return false;
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}
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if(seen_request(c->buffer))
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return true;
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/* Lookup nodes */
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from = lookup_node(from_name);
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if(!from) {
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from = new_node();
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from->name = xstrdup(from_name);
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node_add(from);
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}
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to = lookup_node(to_name);
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if(!to) {
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to = new_node();
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to->name = xstrdup(to_name);
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node_add(to);
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}
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if(tunnelserver && from != myself && from != c->node && to != myself && to != c->node)
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return false;
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/* Convert addresses */
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address = str2sockaddr(to_address, to_port);
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/* Check if edge already exists */
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e = lookup_edge(from, to);
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if(e) {
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if(e->weight != weight || e->options != options || sockaddrcmp(&e->address, &address)) {
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if(from == myself) {
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself which does not match existing entry"),
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"ADD_EDGE", c->name, c->hostname);
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send_add_edge(c, e);
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return true;
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} else {
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) which does not match existing entry"),
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"ADD_EDGE", c->name, c->hostname);
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edge_del(e);
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graph();
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}
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} else
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return true;
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} else if(from == myself) {
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself which does not exist"),
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"ADD_EDGE", c->name, c->hostname);
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e = new_edge();
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e->from = from;
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e->to = to;
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send_del_edge(c, e);
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free_edge(e);
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return true;
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}
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e = new_edge();
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e->from = from;
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e->to = to;
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e->address = address;
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e->options = options;
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e->weight = weight;
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edge_add(e);
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/* Tell the rest about the new edge */
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if(!tunnelserver)
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forward_request(c);
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/* Run MST before or after we tell the rest? */
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graph();
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return true;
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}
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bool send_del_edge(connection_t *c, const edge_t *e) {
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cp();
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return send_request(c, "%d %lx %s %s", DEL_EDGE, random(),
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e->from->name, e->to->name);
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}
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bool del_edge_h(connection_t *c) {
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edge_t *e;
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char from_name[MAX_STRING_SIZE];
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char to_name[MAX_STRING_SIZE];
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node_t *from, *to;
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cp();
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if(sscanf(c->buffer, "%*d %*x "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) {
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logger(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_EDGE", c->name,
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c->hostname);
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return false;
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}
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/* Check if names are valid */
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if(!check_id(from_name)) {
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logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name,
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c->hostname, _("invalid name"));
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return false;
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}
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if(!check_id(to_name)) {
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logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name,
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c->hostname, _("invalid name"));
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return false;
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}
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if(seen_request(c->buffer))
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return true;
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/* Lookup nodes */
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from = lookup_node(from_name);
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if(!from) {
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ifdebug(PROTOCOL) logger(LOG_ERR, _("Got %s from %s (%s) which does not appear in the edge tree"),
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"DEL_EDGE", c->name, c->hostname);
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return true;
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}
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to = lookup_node(to_name);
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if(!to) {
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ifdebug(PROTOCOL) logger(LOG_ERR, _("Got %s from %s (%s) which does not appear in the edge tree"),
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"DEL_EDGE", c->name, c->hostname);
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return true;
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}
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if(tunnelserver && from != myself && from != c->node && to != myself && to != c->node)
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return false;
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/* Check if edge exists */
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e = lookup_edge(from, to);
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if(!e) {
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) which does not appear in the edge tree"),
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"DEL_EDGE", c->name, c->hostname);
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return true;
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}
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if(e->from == myself) {
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself"),
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"DEL_EDGE", c->name, c->hostname);
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send_add_edge(c, e); /* Send back a correction */
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return true;
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}
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/* Tell the rest about the deleted edge */
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if(!tunnelserver)
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forward_request(c);
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/* Delete the edge */
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edge_del(e);
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/* Run MST before or after we tell the rest? */
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graph();
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/* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
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if(!to->status.reachable) {
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e = lookup_edge(to, myself);
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if(e) {
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if(!tunnelserver)
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send_del_edge(broadcast, e);
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edge_del(e);
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}
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}
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return true;
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}
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