2002-02-11 10:05:58 +00:00
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/*
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protocol_subnet.c -- handle the meta-protocol, subnets
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2006-04-26 13:52:58 +00:00
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Copyright (C) 1999-2005 Ivo Timmermans,
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2009-03-05 13:12:36 +00:00
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2000-2009 Guus Sliepen <guus@tinc-vpn.org>
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2002-02-11 10:05:58 +00:00
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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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2004-03-21 14:21:22 +00:00
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$Id$
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2002-02-11 10:05:58 +00:00
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*/
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2003-07-17 15:06:27 +00:00
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#include "system.h"
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2002-02-11 10:05:58 +00:00
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#include "conf.h"
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2003-07-17 15:06:27 +00:00
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#include "connection.h"
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#include "logger.h"
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2002-02-11 10:05:58 +00:00
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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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2003-07-17 15:06:27 +00:00
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#include "protocol.h"
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#include "subnet.h"
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#include "utils.h"
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#include "xalloc.h"
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2002-02-11 10:05:58 +00:00
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2003-07-24 12:08:16 +00:00
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bool send_add_subnet(connection_t *c, const subnet_t *subnet)
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2002-02-11 10:05:58 +00:00
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{
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2003-12-12 19:52:25 +00:00
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char netstr[MAXNETSTR];
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2002-09-09 21:25:28 +00:00
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cp();
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2003-12-12 19:52:25 +00:00
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if(!net2str(netstr, sizeof netstr, subnet))
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return false;
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2002-09-09 21:25:28 +00:00
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2003-12-12 19:52:25 +00:00
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return send_request(c, "%d %lx %s %s", ADD_SUBNET, random(), subnet->owner->name, netstr);
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2002-02-11 10:05:58 +00:00
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}
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2003-07-22 20:55:21 +00:00
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bool add_subnet_h(connection_t *c)
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2002-02-11 10:05:58 +00:00
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{
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2002-09-09 21:25:28 +00:00
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char subnetstr[MAX_STRING_SIZE];
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char name[MAX_STRING_SIZE];
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node_t *owner;
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2003-12-12 19:52:25 +00:00
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subnet_t s = {0}, *new;
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2002-09-09 21:25:28 +00:00
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cp();
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if(sscanf(c->buffer, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
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2003-07-21 14:47:43 +00:00
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logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_SUBNET", c->name,
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2002-09-09 21:25:28 +00:00
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c->hostname);
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2003-07-22 20:55:21 +00:00
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return false;
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2002-09-09 21:25:28 +00:00
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}
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2009-05-20 14:40:04 +00:00
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/* Check if owner name is valid */
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2002-09-09 21:25:28 +00:00
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2003-07-22 20:55:21 +00:00
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if(!check_id(name)) {
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2003-07-21 14:47:43 +00:00
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logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name,
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2002-09-09 21:25:28 +00:00
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c->hostname, _("invalid name"));
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2003-07-22 20:55:21 +00:00
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return false;
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2002-09-09 21:25:28 +00:00
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}
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/* Check if subnet string is valid */
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2003-12-12 19:52:25 +00:00
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if(!str2net(&s, subnetstr)) {
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2003-07-21 14:47:43 +00:00
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logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name,
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2002-09-09 21:25:28 +00:00
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c->hostname, _("invalid subnet string"));
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2003-07-22 20:55:21 +00:00
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return false;
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2002-09-09 21:25:28 +00:00
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}
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if(seen_request(c->buffer))
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2003-07-22 20:55:21 +00:00
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return true;
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2002-09-09 21:25:28 +00:00
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/* Check if the owner of the new subnet is in the connection list */
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owner = lookup_node(name);
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2009-02-09 22:51:10 +00:00
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if(tunnelserver && owner != myself && owner != c->node) {
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/* in case of tunnelserver, ignore indirect subnet registrations */
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Ignoring indirect %s from %s (%s) for %s"),
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"ADD_SUBNET", c->name, c->hostname, subnetstr);
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return true;
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}
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2002-09-09 21:25:28 +00:00
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if(!owner) {
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owner = new_node();
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owner->name = xstrdup(name);
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node_add(owner);
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}
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/* Check if we already know this subnet */
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2003-12-12 19:52:25 +00:00
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if(lookup_subnet(owner, &s))
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2003-07-22 20:55:21 +00:00
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return true;
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2002-09-09 21:25:28 +00:00
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/* If we don't know this subnet, but we are the owner, retaliate with a DEL_SUBNET */
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if(owner == myself) {
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2003-07-12 17:41:48 +00:00
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself"),
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2002-09-09 21:25:28 +00:00
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"ADD_SUBNET", c->name, c->hostname);
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2003-12-12 19:52:25 +00:00
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s.owner = myself;
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send_del_subnet(c, &s);
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2003-07-22 20:55:21 +00:00
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return true;
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2002-09-09 21:25:28 +00:00
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}
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2003-11-17 15:30:18 +00:00
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/* In tunnel server mode, check if the subnet matches one in the config file of this node */
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if(tunnelserver) {
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config_t *cfg;
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subnet_t *allowed;
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for(cfg = lookup_config(c->config_tree, "Subnet"); cfg; cfg = lookup_config_next(c->config_tree, cfg)) {
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if(!get_config_subnet(cfg, &allowed))
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return false;
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2003-12-12 19:52:25 +00:00
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if(!subnet_compare(&s, allowed))
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2003-11-17 15:30:18 +00:00
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break;
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free_subnet(allowed);
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}
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2009-05-24 13:23:24 +00:00
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if(!cfg) {
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logger(LOG_WARNING, _("Unauthorized %s from %s (%s) for %s"),
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"ADD_SUBNET", c->name, c->hostname, subnetstr);
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2003-11-17 15:30:18 +00:00
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return false;
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2009-05-24 13:23:24 +00:00
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}
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2003-11-17 15:30:18 +00:00
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free_subnet(allowed);
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}
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2002-09-09 21:25:28 +00:00
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/* If everything is correct, add the subnet to the list of the owner */
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2003-12-12 19:52:25 +00:00
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*(new = new_subnet()) = s;
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subnet_add(owner, new);
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2002-09-09 21:25:28 +00:00
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2004-12-01 20:06:05 +00:00
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if(owner->status.reachable)
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subnet_update(owner, new, true);
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2002-09-09 21:25:28 +00:00
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/* Tell the rest */
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2003-11-17 15:30:18 +00:00
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if(!tunnelserver)
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2003-11-10 22:31:53 +00:00
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forward_request(c);
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2002-09-09 21:25:28 +00:00
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2003-07-22 20:55:21 +00:00
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return true;
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2002-02-11 10:05:58 +00:00
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}
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2003-07-24 12:08:16 +00:00
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bool send_del_subnet(connection_t *c, const subnet_t *s)
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2002-02-11 10:05:58 +00:00
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{
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2003-12-12 19:52:25 +00:00
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char netstr[MAXNETSTR];
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2002-09-09 21:25:28 +00:00
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cp();
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2003-12-12 19:52:25 +00:00
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if(!net2str(netstr, sizeof netstr, s))
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return false;
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2002-09-09 21:25:28 +00:00
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2003-12-12 19:52:25 +00:00
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return send_request(c, "%d %lx %s %s", DEL_SUBNET, random(), s->owner->name, netstr);
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2002-02-11 10:05:58 +00:00
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}
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2003-07-22 20:55:21 +00:00
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bool del_subnet_h(connection_t *c)
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2002-02-11 10:05:58 +00:00
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{
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2002-09-09 21:25:28 +00:00
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char subnetstr[MAX_STRING_SIZE];
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char name[MAX_STRING_SIZE];
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node_t *owner;
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2003-12-12 19:52:25 +00:00
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subnet_t s = {0}, *find;
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2002-09-09 21:25:28 +00:00
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cp();
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if(sscanf(c->buffer, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
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2003-07-21 14:47:43 +00:00
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logger(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_SUBNET", c->name,
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2002-09-09 21:25:28 +00:00
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c->hostname);
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2003-07-22 20:55:21 +00:00
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return false;
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2002-09-09 21:25:28 +00:00
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}
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2009-05-20 14:40:04 +00:00
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/* Check if owner name is valid */
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2002-09-09 21:25:28 +00:00
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2003-07-22 20:55:21 +00:00
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if(!check_id(name)) {
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2003-07-21 14:47:43 +00:00
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logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name,
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2002-09-09 21:25:28 +00:00
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c->hostname, _("invalid name"));
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2003-07-22 20:55:21 +00:00
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return false;
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2002-09-09 21:25:28 +00:00
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}
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/* Check if subnet string is valid */
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2003-12-12 19:52:25 +00:00
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if(!str2net(&s, subnetstr)) {
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2003-07-21 14:47:43 +00:00
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logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name,
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2002-09-09 21:25:28 +00:00
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c->hostname, _("invalid subnet string"));
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2003-07-22 20:55:21 +00:00
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return false;
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2002-09-09 21:25:28 +00:00
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}
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if(seen_request(c->buffer))
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2003-07-22 20:55:21 +00:00
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return true;
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2002-09-09 21:25:28 +00:00
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2009-05-20 14:40:04 +00:00
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/* Check if the owner of the subnet being deleted is in the connection list */
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owner = lookup_node(name);
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if(tunnelserver && owner != myself && owner != c->node) {
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/* in case of tunnelserver, ignore indirect subnet deletion */
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Ignoring indirect %s from %s (%s) for %s"),
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"DEL_SUBNET", c->name, c->hostname, subnetstr);
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return true;
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}
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if(!owner) {
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for %s which is not in our node tree"),
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"DEL_SUBNET", c->name, c->hostname, name);
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return true;
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}
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2002-09-09 21:25:28 +00:00
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/* If everything is correct, delete the subnet from the list of the owner */
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2003-12-12 19:52:25 +00:00
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s.owner = owner;
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2002-09-09 21:25:28 +00:00
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2003-12-12 19:52:25 +00:00
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find = lookup_subnet(owner, &s);
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2002-09-09 21:25:28 +00:00
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if(!find) {
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2003-07-12 17:41:48 +00:00
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for %s which does not appear in his subnet tree"),
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2002-09-09 21:25:28 +00:00
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"DEL_SUBNET", c->name, c->hostname, name);
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2003-07-22 20:55:21 +00:00
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return true;
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2002-09-09 21:25:28 +00:00
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}
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/* If we are the owner of this subnet, retaliate with an ADD_SUBNET */
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if(owner == myself) {
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2003-07-12 17:41:48 +00:00
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ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself"),
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2002-09-09 21:25:28 +00:00
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"DEL_SUBNET", c->name, c->hostname);
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send_add_subnet(c, find);
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2003-07-22 20:55:21 +00:00
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return true;
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2002-09-09 21:25:28 +00:00
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}
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/* Tell the rest */
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2003-11-17 15:30:18 +00:00
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if(!tunnelserver)
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2003-11-10 22:31:53 +00:00
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forward_request(c);
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2002-09-09 21:25:28 +00:00
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/* Finally, delete it. */
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2004-12-01 20:06:05 +00:00
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if(owner->status.reachable)
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subnet_update(owner, find, false);
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2002-09-09 21:25:28 +00:00
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subnet_del(owner, find);
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2003-07-22 20:55:21 +00:00
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return true;
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2002-02-11 10:05:58 +00:00
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}
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