2 protocol_subnet.c -- handle the meta-protocol, subnets
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2012 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"
33 bool send_add_subnet(connection_t *c, const subnet_t *subnet) {
34 char netstr[MAXNETSTR];
36 if(!net2str(netstr, sizeof(netstr), subnet)) {
40 return send_request(c, "%d %x %s %s", ADD_SUBNET, prng(UINT32_MAX), subnet->owner->name, netstr);
43 bool add_subnet_h(connection_t *c, const char *request) {
44 char subnetstr[MAX_STRING_SIZE];
45 char name[MAX_STRING_SIZE];
47 subnet_t s = {0}, *new, *old;
49 if(sscanf(request, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
50 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ADD_SUBNET", c->name,
55 /* Check if owner name is valid */
58 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_SUBNET", c->name,
59 c->hostname, "invalid name");
63 /* Check if subnet string is valid */
65 if(!str2net(&s, subnetstr)) {
66 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_SUBNET", c->name,
67 c->hostname, "invalid subnet string");
71 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 logger(DEBUG_PROTOCOL, LOG_WARNING, "Ignoring indirect %s from %s (%s) for %s",
82 "ADD_SUBNET", c->name, c->hostname, subnetstr);
87 owner = new_node(name);
91 /* Check if we already know this subnet */
93 if(lookup_subnet(owner, &s)) {
97 /* If we don't know this subnet, but we are the owner, retaliate with a DEL_SUBNET */
100 logger(DEBUG_PROTOCOL, 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, we should already know all allowed subnets */
110 logger(DEBUG_ALWAYS, LOG_WARNING, "Ignoring unauthorized %s from %s (%s): %s",
111 "ADD_SUBNET", c->name, c->hostname, subnetstr);
115 /* Ignore if strictsubnets is true, but forward it to others */
118 logger(DEBUG_ALWAYS, LOG_WARNING, "Ignoring unauthorized %s from %s (%s): %s",
119 "ADD_SUBNET", c->name, c->hostname, subnetstr);
120 forward_request(c, request);
124 /* If everything is correct, add the subnet to the list of the owner */
126 *(new = new_subnet()) = s;
127 subnet_add(owner, new);
129 if(owner->status.reachable) {
130 subnet_update(owner, new, true);
136 forward_request(c, request);
139 /* Fast handoff of roaming MAC addresses */
141 if(s.type == SUBNET_MAC && owner != myself && (old = lookup_subnet(myself, &s)) && old->expires) {
148 bool send_del_subnet(connection_t *c, const subnet_t *s) {
149 char netstr[MAXNETSTR];
151 if(!net2str(netstr, sizeof(netstr), s)) {
155 return send_request(c, "%d %x %s %s", DEL_SUBNET, prng(UINT32_MAX), s->owner->name, netstr);
158 bool del_subnet_h(connection_t *c, const char *request) {
159 char subnetstr[MAX_STRING_SIZE];
160 char name[MAX_STRING_SIZE];
162 subnet_t s = {0}, *find;
164 if(sscanf(request, "%*d %*x " MAX_STRING " " MAX_STRING, name, subnetstr) != 2) {
165 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "DEL_SUBNET", c->name,
170 /* Check if owner name is valid */
172 if(!check_id(name)) {
173 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_SUBNET", c->name,
174 c->hostname, "invalid name");
178 /* Check if subnet string is valid */
180 if(!str2net(&s, subnetstr)) {
181 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_SUBNET", c->name,
182 c->hostname, "invalid subnet string");
186 if(seen_request(request)) {
190 /* Check if the owner of the subnet being deleted is in the connection list */
192 owner = lookup_node(name);
194 if(tunnelserver && owner != myself && owner != c->node) {
195 /* in case of tunnelserver, ignore indirect subnet deletion */
196 logger(DEBUG_PROTOCOL, LOG_WARNING, "Ignoring indirect %s from %s (%s) for %s",
197 "DEL_SUBNET", c->name, c->hostname, subnetstr);
202 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for %s which is not in our node tree",
203 "DEL_SUBNET", c->name, c->hostname, name);
207 /* If everything is correct, delete the subnet from the list of the owner */
211 find = lookup_subnet(owner, &s);
214 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for %s which does not appear in his subnet tree",
215 "DEL_SUBNET", c->name, c->hostname, name);
218 forward_request(c, request);
224 /* If we are the owner of this subnet, retaliate with an ADD_SUBNET */
226 if(owner == myself) {
227 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself",
228 "DEL_SUBNET", c->name, c->hostname);
229 send_add_subnet(c, find);
240 forward_request(c, request);
247 /* Finally, delete it. */
249 if(owner->status.reachable) {
250 subnet_update(owner, find, false);
253 subnet_del(owner, find);