2 protocol_subnet.c -- handle the meta-protocol, subnets
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
5 2009 Michael Tokarev <mjt@tls.msk.ru>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write to the Free Software Foundation, Inc.,
19 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 #include "connection.h"
35 bool send_add_subnet(connection_t *c, const subnet_t *subnet) {
36 char netstr[MAXNETSTR];
38 if(!net2str(netstr, sizeof netstr, subnet))
41 return send_request(c, "%d %x %s %s", ADD_SUBNET, rand(), subnet->owner->name, netstr);
44 bool add_subnet_h(connection_t *c, char *request) {
45 char subnetstr[MAX_STRING_SIZE];
46 char name[MAX_STRING_SIZE];
48 subnet_t s = {0}, *new, *old;
50 if(sscanf(request, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
51 logger(LOG_ERR, "Got bad %s from %s (%s)", "ADD_SUBNET", c->name,
56 /* Check if owner name is valid */
59 logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_SUBNET", c->name,
60 c->hostname, "invalid name");
64 /* Check if subnet string is valid */
66 if(!str2net(&s, subnetstr)) {
67 logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_SUBNET", c->name,
68 c->hostname, "invalid subnet string");
72 if(seen_request(request))
75 /* Check if the owner of the new subnet is in the connection list */
77 owner = lookup_node(name);
79 if(tunnelserver && owner != myself && owner != c->node) {
80 /* in case of tunnelserver, ignore indirect subnet registrations */
81 ifdebug(PROTOCOL) logger(LOG_WARNING, "Ignoring indirect %s from %s (%s) for %s",
82 "ADD_SUBNET", c->name, c->hostname, subnetstr);
88 owner->name = xstrdup(name);
92 /* Check if we already know this subnet */
94 if(lookup_subnet(owner, &s))
97 /* If we don't know this subnet, but we are the owner, retaliate with a DEL_SUBNET */
100 ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for ourself",
101 "ADD_SUBNET", c->name, c->hostname);
103 send_del_subnet(c, &s);
107 /* In tunnel server mode, check if the subnet matches one in the config file of this node */
113 for(cfg = lookup_config(c->config_tree, "Subnet"); cfg; cfg = lookup_config_next(c->config_tree, cfg)) {
114 if(!get_config_subnet(cfg, &allowed))
117 if(!subnet_compare(&s, allowed))
120 free_subnet(allowed);
124 logger(LOG_WARNING, "Ignoring unauthorized %s from %s (%s): %s",
125 "ADD_SUBNET", c->name, c->hostname, subnetstr);
129 free_subnet(allowed);
132 /* If everything is correct, add the subnet to the list of the owner */
134 *(new = new_subnet()) = s;
135 subnet_add(owner, new);
137 if(owner->status.reachable)
138 subnet_update(owner, new, true);
143 forward_request(c, request);
145 /* Fast handoff of roaming MAC addresses */
147 if(s.type == SUBNET_MAC && owner != myself && (old = lookup_subnet(myself, &s)) && old->expires)
153 bool send_del_subnet(connection_t *c, const subnet_t *s) {
154 char netstr[MAXNETSTR];
156 if(!net2str(netstr, sizeof netstr, s))
159 return send_request(c, "%d %x %s %s", DEL_SUBNET, rand(), s->owner->name, netstr);
162 bool del_subnet_h(connection_t *c, char *request) {
163 char subnetstr[MAX_STRING_SIZE];
164 char name[MAX_STRING_SIZE];
166 subnet_t s = {0}, *find;
168 if(sscanf(request, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
169 logger(LOG_ERR, "Got bad %s from %s (%s)", "DEL_SUBNET", c->name,
174 /* Check if owner name is valid */
176 if(!check_id(name)) {
177 logger(LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_SUBNET", c->name,
178 c->hostname, "invalid name");
182 /* Check if subnet string is valid */
184 if(!str2net(&s, subnetstr)) {
185 logger(LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_SUBNET", c->name,
186 c->hostname, "invalid subnet string");
190 if(seen_request(request))
193 /* Check if the owner of the subnet being deleted is in the connection list */
195 owner = lookup_node(name);
197 if(tunnelserver && owner != myself && owner != c->node) {
198 /* in case of tunnelserver, ignore indirect subnet deletion */
199 ifdebug(PROTOCOL) logger(LOG_WARNING, "Ignoring indirect %s from %s (%s) for %s",
200 "DEL_SUBNET", c->name, c->hostname, subnetstr);
205 ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for %s which is not in our node tree",
206 "DEL_SUBNET", c->name, c->hostname, name);
210 /* If everything is correct, delete the subnet from the list of the owner */
214 find = lookup_subnet(owner, &s);
217 ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for %s which does not appear in his subnet tree",
218 "DEL_SUBNET", c->name, c->hostname, name);
222 /* If we are the owner of this subnet, retaliate with an ADD_SUBNET */
224 if(owner == myself) {
225 ifdebug(PROTOCOL) logger(LOG_WARNING, "Got %s from %s (%s) for ourself",
226 "DEL_SUBNET", c->name, c->hostname);
227 send_add_subnet(c, find);
234 forward_request(c, request);
236 /* Finally, delete it. */
238 if(owner->status.reachable)
239 subnet_update(owner, find, false);
241 subnet_del(owner, find);