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>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include "connection.h"
36 bool send_add_subnet(connection_t *c, const subnet_t *subnet)
38 char netstr[MAXNETSTR];
42 if(!net2str(netstr, sizeof netstr, subnet))
45 return send_request(c, "%d %lx %s %s", ADD_SUBNET, random(), subnet->owner->name, netstr);
48 bool add_subnet_h(connection_t *c, char *request)
50 char subnetstr[MAX_STRING_SIZE];
51 char name[MAX_STRING_SIZE];
53 subnet_t s = {0}, *new;
57 if(sscanf(request, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
58 logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_SUBNET", c->name,
63 /* Check if owner name is valid */
66 logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name,
67 c->hostname, _("invalid name"));
71 /* Check if subnet string is valid */
73 if(!str2net(&s, subnetstr)) {
74 logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name,
75 c->hostname, _("invalid subnet string"));
79 if(seen_request(request))
82 /* Check if the owner of the new subnet is in the connection list */
84 owner = lookup_node(name);
86 if(tunnelserver && owner != myself && owner != c->node) {
87 /* in case of tunnelserver, ignore indirect subnet registrations */
88 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Ignoring indirect %s from %s (%s) for %s"),
89 "ADD_SUBNET", c->name, c->hostname, subnetstr);
95 owner->name = xstrdup(name);
99 /* Check if we already know this subnet */
101 if(lookup_subnet(owner, &s))
104 /* If we don't know this subnet, but we are the owner, retaliate with a DEL_SUBNET */
106 if(owner == myself) {
107 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself"),
108 "ADD_SUBNET", c->name, c->hostname);
110 send_del_subnet(c, &s);
114 /* In tunnel server mode, check if the subnet matches one in the config file of this node */
120 for(cfg = lookup_config(c->config_tree, "Subnet"); cfg; cfg = lookup_config_next(c->config_tree, cfg)) {
121 if(!get_config_subnet(cfg, &allowed))
124 if(!subnet_compare(&s, allowed))
127 free_subnet(allowed);
131 logger(LOG_WARNING, _("Unauthorized %s from %s (%s) for %s"),
132 "ADD_SUBNET", c->name, c->hostname, subnetstr);
136 free_subnet(allowed);
139 /* If everything is correct, add the subnet to the list of the owner */
141 *(new = new_subnet()) = s;
142 subnet_add(owner, new);
144 if(owner->status.reachable)
145 subnet_update(owner, new, true);
150 forward_request(c, request);
155 bool send_del_subnet(connection_t *c, const subnet_t *s)
157 char netstr[MAXNETSTR];
161 if(!net2str(netstr, sizeof netstr, s))
164 return send_request(c, "%d %lx %s %s", DEL_SUBNET, random(), s->owner->name, netstr);
167 bool del_subnet_h(connection_t *c, char *request)
169 char subnetstr[MAX_STRING_SIZE];
170 char name[MAX_STRING_SIZE];
172 subnet_t s = {0}, *find;
176 if(sscanf(request, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
177 logger(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_SUBNET", c->name,
182 /* Check if owner name is valid */
184 if(!check_id(name)) {
185 logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name,
186 c->hostname, _("invalid name"));
190 /* Check if subnet string is valid */
192 if(!str2net(&s, subnetstr)) {
193 logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name,
194 c->hostname, _("invalid subnet string"));
198 if(seen_request(request))
201 /* Check if the owner of the subnet being deleted is in the connection list */
203 owner = lookup_node(name);
205 if(tunnelserver && owner != myself && owner != c->node) {
206 /* in case of tunnelserver, ignore indirect subnet deletion */
207 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Ignoring indirect %s from %s (%s) for %s"),
208 "DEL_SUBNET", c->name, c->hostname, subnetstr);
213 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for %s which is not in our node tree"),
214 "DEL_SUBNET", c->name, c->hostname, name);
218 /* If everything is correct, delete the subnet from the list of the owner */
222 find = lookup_subnet(owner, &s);
225 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for %s which does not appear in his subnet tree"),
226 "DEL_SUBNET", c->name, c->hostname, name);
230 /* If we are the owner of this subnet, retaliate with an ADD_SUBNET */
232 if(owner == myself) {
233 ifdebug(PROTOCOL) logger(LOG_WARNING, _("Got %s from %s (%s) for ourself"),
234 "DEL_SUBNET", c->name, c->hostname);
235 send_add_subnet(c, find);
242 forward_request(c, request);
244 /* Finally, delete it. */
246 if(owner->status.reachable)
247 subnet_update(owner, find, false);
249 subnet_del(owner, find);