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 x = send_request(c, "%d %x %s %s %s %s %x %d", ADD_EDGE, rand(),
44 e->from->name, e->to->name, address, port,
45 e->options, e->weight);
52 bool add_edge_h(connection_t *c, const char *request) {
55 char from_name[MAX_STRING_SIZE];
56 char to_name[MAX_STRING_SIZE];
57 char to_address[MAX_STRING_SIZE];
58 char to_port[MAX_STRING_SIZE];
63 if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %x %d",
64 from_name, to_name, to_address, to_port, &options, &weight) != 6) {
65 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ADD_EDGE", c->name,
70 /* Check if names are valid */
72 if(!check_id(from_name) || !check_id(to_name)) {
73 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ADD_EDGE", c->name,
74 c->hostname, "invalid name");
78 if(seen_request(request))
83 from = lookup_node(from_name);
84 to = lookup_node(to_name);
87 from != myself && from != c->node &&
88 to != myself && to != c->node) {
89 /* ignore indirect edge registrations for tunnelserver */
90 logger(DEBUG_PROTOCOL, LOG_WARNING,
91 "Ignoring indirect %s from %s (%s)",
92 "ADD_EDGE", c->name, c->hostname);
98 from->name = xstrdup(from_name);
104 to->name = xstrdup(to_name);
109 /* Convert addresses */
111 address = str2sockaddr(to_address, to_port);
113 /* Check if edge already exists */
115 e = lookup_edge(from, to);
118 if(e->weight != weight || e->options != options || sockaddrcmp(&e->address, &address)) {
120 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself which does not match existing entry",
121 "ADD_EDGE", c->name, c->hostname);
125 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) which does not match existing entry",
126 "ADD_EDGE", c->name, c->hostname);
132 } else if(from == myself) {
133 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself which does not exist",
134 "ADD_EDGE", c->name, c->hostname);
135 contradicting_add_edge++;
147 e->address = address;
148 e->options = options;
152 /* Tell the rest about the new edge */
155 forward_request(c, request);
157 /* Run MST before or after we tell the rest? */
164 bool send_del_edge(connection_t *c, const edge_t *e) {
165 return send_request(c, "%d %x %s %s", DEL_EDGE, rand(),
166 e->from->name, e->to->name);
169 bool del_edge_h(connection_t *c, const char *request) {
171 char from_name[MAX_STRING_SIZE];
172 char to_name[MAX_STRING_SIZE];
175 if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) {
176 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "DEL_EDGE", c->name,
181 /* Check if names are valid */
183 if(!check_id(from_name) || !check_id(to_name)) {
184 logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "DEL_EDGE", c->name,
185 c->hostname, "invalid name");
189 if(seen_request(request))
194 from = lookup_node(from_name);
195 to = lookup_node(to_name);
198 from != myself && from != c->node &&
199 to != myself && to != c->node) {
200 /* ignore indirect edge registrations for tunnelserver */
201 logger(DEBUG_PROTOCOL, LOG_WARNING,
202 "Ignoring indirect %s from %s (%s)",
203 "DEL_EDGE", c->name, c->hostname);
208 logger(DEBUG_PROTOCOL, LOG_ERR, "Got %s from %s (%s) which does not appear in the edge tree",
209 "DEL_EDGE", c->name, c->hostname);
214 logger(DEBUG_PROTOCOL, LOG_ERR, "Got %s from %s (%s) which does not appear in the edge tree",
215 "DEL_EDGE", c->name, c->hostname);
219 /* Check if edge exists */
221 e = lookup_edge(from, to);
224 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) which does not appear in the edge tree",
225 "DEL_EDGE", c->name, c->hostname);
229 if(e->from == myself) {
230 logger(DEBUG_PROTOCOL, LOG_WARNING, "Got %s from %s (%s) for ourself",
231 "DEL_EDGE", c->name, c->hostname);
232 contradicting_del_edge++;
233 send_add_edge(c, e); /* Send back a correction */
237 /* Tell the rest about the deleted edge */
240 forward_request(c, request);
242 /* Delete the edge */
246 /* Run MST before or after we tell the rest? */
250 /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
252 if(!to->status.reachable) {
253 e = lookup_edge(to, myself);
256 send_del_edge(everyone, e);