2 protocol_edge.c -- handle the meta-protocol, edges
3 Copyright (C) 2014 Guus Sliepen <guus@meshlink.io>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License along
16 with this program; if not, write to the Free Software Foundation, Inc.,
17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include "connection.h"
27 #include "meshlink_internal.h"
36 bool send_add_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e) {
40 sockaddr2str(&e->address, &address, &port);
42 x = send_request(mesh, c, "%d %x %s %d %s %s %s %d %x %d", ADD_EDGE, rand(),
43 e->from->name, e->from->dclass, e->to->name, address, port, e->to->dclass,
44 e->options, e->weight);
51 bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
54 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];
64 if(sscanf(request, "%*d %*x "MAX_STRING" %d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %x %d",
65 from_name, &from_dclass, to_name, to_address, to_port, &to_dclass, &options, &weight) != 8) {
66 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s)", "ADD_EDGE", c->name,
71 /* Check if names are valid */
73 if(!check_id(from_name) || !check_id(to_name)) {
74 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s): %s", "ADD_EDGE", c->name,
75 c->hostname, "invalid name");
79 if(seen_request(mesh, request))
84 from = lookup_node(mesh, from_name);
85 to = lookup_node(mesh, to_name);
89 from->name = xstrdup(from_name);
93 from->dclass = from_dclass;
94 node_write_dclass(mesh, from);
98 to->name = xstrdup(to_name);
102 to->dclass = to_dclass;
103 node_write_dclass(mesh, to);
105 /* Convert addresses */
107 address = str2sockaddr(to_address, to_port);
109 /* Check if edge already exists */
111 e = lookup_edge(from, to);
114 if(e->weight != weight || e->options != options || sockaddrcmp(&e->address, &address)) {
115 if(from == mesh->self) {
116 logger(mesh, MESHLINK_WARNING, "Got %s from %s (%s) for ourself which does not match existing entry",
117 "ADD_EDGE", c->name, c->hostname);
118 send_add_edge(mesh, c, e);
121 logger(mesh, MESHLINK_WARNING, "Got %s from %s (%s) which does not match existing entry",
122 "ADD_EDGE", c->name, c->hostname);
128 } else if(from == mesh->self) {
129 logger(mesh, MESHLINK_WARNING, "Got %s from %s (%s) for ourself which does not exist",
130 "ADD_EDGE", c->name, c->hostname);
131 mesh->contradicting_add_edge++;
135 send_del_edge(mesh, c, e);
143 e->address = address;
144 e->options = options;
148 /* Tell the rest about the new edge */
150 forward_request(mesh, c, request);
152 /* Run MST before or after we tell the rest? */
159 bool send_del_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e) {
160 return send_request(mesh, c, "%d %x %s %s", DEL_EDGE, rand(),
161 e->from->name, e->to->name);
164 bool del_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
166 char from_name[MAX_STRING_SIZE];
167 char to_name[MAX_STRING_SIZE];
170 if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) {
171 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s)", "DEL_EDGE", c->name,
176 /* Check if names are valid */
178 if(!check_id(from_name) || !check_id(to_name)) {
179 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s): %s", "DEL_EDGE", c->name,
180 c->hostname, "invalid name");
184 if(seen_request(mesh, request))
189 from = lookup_node(mesh, from_name);
190 to = lookup_node(mesh, to_name);
193 logger(mesh, MESHLINK_ERROR, "Got %s from %s (%s) which does not appear in the edge tree",
194 "DEL_EDGE", c->name, c->hostname);
199 logger(mesh, MESHLINK_ERROR, "Got %s from %s (%s) which does not appear in the edge tree",
200 "DEL_EDGE", c->name, c->hostname);
204 /* Check if edge exists */
206 e = lookup_edge(from, to);
209 logger(mesh, MESHLINK_WARNING, "Got %s from %s (%s) which does not appear in the edge tree",
210 "DEL_EDGE", c->name, c->hostname);
214 if(e->from == mesh->self) {
215 logger(mesh, MESHLINK_WARNING, "Got %s from %s (%s) for ourself",
216 "DEL_EDGE", c->name, c->hostname);
217 mesh->contradicting_del_edge++;
218 send_add_edge(mesh, c, e); /* Send back a correction */
222 /* Tell the rest about the deleted edge */
224 forward_request(mesh, c, request);
226 /* Delete the edge */
230 /* Run MST before or after we tell the rest? */
234 /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
236 if(!to->status.reachable) {
237 e = lookup_edge(to, mesh->self);
239 send_del_edge(mesh, mesh->everyone, e);