2 protocol_edge.c -- handle the meta-protocol, edges
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2012 Guus Sliepen <guus@tinc-vpn.org>
5 2009 Michael Tokarev <mjt@corpit.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"
37 bool send_add_edge(connection_t *c, const edge_t *e) {
41 sockaddr2str(&e->address, &address, &port);
43 if(e->local_address.sa.sa_family) {
44 char *local_address, *local_port;
45 sockaddr2str(&e->local_address, &local_address, &local_port);
47 x = send_request(c, "%d %x %s %s %s %s %x %d %s %s", ADD_EDGE, rand(),
48 e->from->name, e->to->name, address, port,
49 e->options, e->weight, local_address, local_port);
53 x = send_request(c, "%d %x %s %s %s %s %x %d", ADD_EDGE, rand(),
54 e->from->name, e->to->name, address, port,
55 e->options, e->weight);
64 bool add_edge_h(connection_t *c, const char *request) {
67 char from_name[MAX_STRING_SIZE];
68 char to_name[MAX_STRING_SIZE];
69 char to_address[MAX_STRING_SIZE];
70 char to_port[MAX_STRING_SIZE];
71 char address_local[MAX_STRING_SIZE];
72 char port_local[MAX_STRING_SIZE];
73 sockaddr_t address, local_address = {{0}};
77 int parameter_count = sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %x %d "MAX_STRING" "MAX_STRING,
78 from_name, to_name, to_address, to_port, &options, &weight, address_local, port_local);
79 if (parameter_count != 6 && parameter_count != 8) {
80 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ADD_EDGE", c->name,
85 /* Check if names are valid */
87 if(!check_id(from_name) || !check_id(to_name)) {
88 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_EDGE", c->name,
89 c->hostname, "invalid name");
93 if(seen_request(request))
98 from = lookup_node(from_name);
99 to = lookup_node(to_name);
102 from != myself && from != c->node &&
103 to != myself && to != c->node) {
104 /* ignore indirect edge registrations for tunnelserver */
105 logger(DEBUG_PROTOCOL, LOG_WARNING,
106 "Ignoring indirect %s from %s (%s)",
107 "ADD_EDGE", c->name, c->hostname);
113 from->name = xstrdup(from_name);
119 to->name = xstrdup(to_name);
124 /* Convert addresses */
126 address = str2sockaddr(to_address, to_port);
127 if(parameter_count >= 8)
128 local_address = str2sockaddr(address_local, port_local);
130 /* Check if edge already exists */
132 e = lookup_edge(from, to);
135 if(e->weight != weight || e->options != options || sockaddrcmp(&e->address, &address)) {
137 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself which does not match existing entry",
138 "ADD_EDGE", c->name, c->hostname);
140 sockaddrfree(&local_address);
143 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) which does not match existing entry",
144 "ADD_EDGE", c->name, c->hostname);
148 } else if(sockaddrcmp(&e->local_address, &local_address)) {
150 if(e->local_address.sa.sa_family && local_address.sa.sa_family) {
151 // Someone has the wrong local address for ourself. Correct then.
152 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself which does not match existing entry",
153 "ADD_EDGE", c->name, c->hostname);
155 sockaddrfree(&local_address);
158 // Otherwise, just ignore it.
159 sockaddrfree(&local_address);
161 } else if(local_address.sa.sa_family && local_address.sa.sa_family != AF_UNKNOWN) {
162 // We learned a new local address for this edge.
163 // local_address.sa.sa_family will be 0 if we got it from older tinc versions
164 // local_address.sa.sa_family will be 255 (AF_UNKNOWN) if we got it from newer versions
165 // but for edge which does not have local_address
166 sockaddrfree(&e->local_address);
167 e->local_address = local_address;
169 // Tell others about it.
171 forward_request(c, request);
175 sockaddrfree(&local_address);
179 sockaddrfree(&local_address);
182 } else if(from == myself) {
183 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself which does not exist",
184 "ADD_EDGE", c->name, c->hostname);
185 contradicting_add_edge++;
191 sockaddrfree(&local_address);
198 e->address = address;
199 e->local_address = local_address;
200 e->options = options;
204 /* Tell the rest about the new edge */
207 forward_request(c, request);
209 /* Run MST before or after we tell the rest? */
216 bool send_del_edge(connection_t *c, const edge_t *e) {
217 return send_request(c, "%d %x %s %s", DEL_EDGE, rand(),
218 e->from->name, e->to->name);
221 bool del_edge_h(connection_t *c, const char *request) {
223 char from_name[MAX_STRING_SIZE];
224 char to_name[MAX_STRING_SIZE];
227 if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) {
228 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "DEL_EDGE", c->name,
233 /* Check if names are valid */
235 if(!check_id(from_name) || !check_id(to_name)) {
236 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_EDGE", c->name,
237 c->hostname, "invalid name");
241 if(seen_request(request))
246 from = lookup_node(from_name);
247 to = lookup_node(to_name);
250 from != myself && from != c->node &&
251 to != myself && to != c->node) {
252 /* ignore indirect edge registrations for tunnelserver */
253 logger(DEBUG_PROTOCOL, LOG_WARNING,
254 "Ignoring indirect %s from %s (%s)",
255 "DEL_EDGE", c->name, c->hostname);
260 logger(DEBUG_PROTOCOL, LOG_ERR, "Got %s from %s (%s) which does not appear in the edge tree",
261 "DEL_EDGE", c->name, c->hostname);
266 logger(DEBUG_PROTOCOL, LOG_ERR, "Got %s from %s (%s) which does not appear in the edge tree",
267 "DEL_EDGE", c->name, c->hostname);
271 /* Check if edge exists */
273 e = lookup_edge(from, to);
276 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) which does not appear in the edge tree",
277 "DEL_EDGE", c->name, c->hostname);
281 if(e->from == myself) {
282 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself",
283 "DEL_EDGE", c->name, c->hostname);
284 contradicting_del_edge++;
285 send_add_edge(c, e); /* Send back a correction */
289 /* Tell the rest about the deleted edge */
292 forward_request(c, request);
294 /* Delete the edge */
298 /* Run MST before or after we tell the rest? */
302 /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
304 if(!to->status.reachable) {
305 e = lookup_edge(to, myself);
308 send_del_edge(everyone, e);