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
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include "connection.h"
35 bool send_add_subnet(connection_t *c, const subnet_t *subnet)
37 char netstr[MAXNETSTR];
41 if(!net2str(netstr, sizeof netstr, subnet))
44 return send_request(c, "%d %x %s %s", ADD_SUBNET, rand(), subnet->owner->name, netstr);
47 bool add_subnet_h(connection_t *c)
49 char subnetstr[MAX_STRING_SIZE];
50 char name[MAX_STRING_SIZE];
52 subnet_t s = {0}, *new;
56 if(sscanf(c->buffer, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
57 logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_SUBNET", c->name,
62 /* Check if owner name is valid */
65 logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name,
66 c->hostname, _("invalid name"));
70 /* Check if subnet string is valid */
72 if(!str2net(&s, subnetstr)) {
73 logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name,
74 c->hostname, _("invalid subnet string"));
78 if(seen_request(c->buffer))
81 /* Check if the owner of the new subnet is in the connection list */
83 owner = lookup_node(name);
85 if(tunnelserver && owner != myself && owner != c->node) {
86 /* in case of tunnelserver, ignore indirect subnet registrations */
87 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Ignoring indirect %s from %s (%s) for %s"),
88 "ADD_SUBNET", c->name, c->hostname, subnetstr);
94 owner->name = xstrdup(name);
98 /* Check if we already know this subnet */
100 if(lookup_subnet(owner, &s))
103 /* If we don't know this subnet, but we are the owner, retaliate with a DEL_SUBNET */
105 if(owner == myself) {
106 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself"),
107 "ADD_SUBNET", c->name, c->hostname);
109 send_del_subnet(c, &s);
113 /* In tunnel server mode, check if the subnet matches one in the config file of this node */
119 for(cfg = lookup_config(c->config_tree, "Subnet"); cfg; cfg = lookup_config_next(c->config_tree, cfg)) {
120 if(!get_config_subnet(cfg, &allowed))
123 if(!subnet_compare(&s, allowed))
126 free_subnet(allowed);
130 logger(LOG_WARNING, _("Unauthorized %s from %s (%s) for %s"),
131 "ADD_SUBNET", c->name, c->hostname, subnetstr);
135 free_subnet(allowed);
138 /* If everything is correct, add the subnet to the list of the owner */
140 *(new = new_subnet()) = s;
141 subnet_add(owner, new);
143 if(owner->status.reachable)
144 subnet_update(owner, new, true);
154 bool send_del_subnet(connection_t *c, const subnet_t *s)
156 char netstr[MAXNETSTR];
160 if(!net2str(netstr, sizeof netstr, s))
163 return send_request(c, "%d %x %s %s", DEL_SUBNET, rand(), s->owner->name, netstr);
166 bool del_subnet_h(connection_t *c)
168 char subnetstr[MAX_STRING_SIZE];
169 char name[MAX_STRING_SIZE];
171 subnet_t s = {0}, *find;
175 if(sscanf(c->buffer, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
176 logger(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_SUBNET", c->name,
181 /* Check if owner name is valid */
183 if(!check_id(name)) {
184 logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name,
185 c->hostname, _("invalid name"));
189 /* Check if subnet string is valid */
191 if(!str2net(&s, subnetstr)) {
192 logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name,
193 c->hostname, _("invalid subnet string"));
197 if(seen_request(c->buffer))
200 /* Check if the owner of the subnet being deleted is in the connection list */
202 owner = lookup_node(name);
204 if(tunnelserver && owner != myself && owner != c->node) {
205 /* in case of tunnelserver, ignore indirect subnet deletion */
206 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Ignoring indirect %s from %s (%s) for %s"),
207 "DEL_SUBNET", c->name, c->hostname, subnetstr);
212 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for %s which is not in our node tree"),
213 "DEL_SUBNET", c->name, c->hostname, name);
217 /* If everything is correct, delete the subnet from the list of the owner */
221 find = lookup_subnet(owner, &s);
224 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for %s which does not appear in his subnet tree"),
225 "DEL_SUBNET", c->name, c->hostname, name);
229 /* If we are the owner of this subnet, retaliate with an ADD_SUBNET */
231 if(owner == myself) {
232 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself"),
233 "DEL_SUBNET", c->name, c->hostname);
234 send_add_subnet(c, find);
243 /* Finally, delete it. */
245 if(owner->status.reachable)
246 subnet_update(owner, find, false);
248 subnet_del(owner, find);