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 extern bool node_write_devclass(meshlink_handle_t *mesh, node_t *n);
38 bool send_add_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e, int contradictions) {
42 sockaddr2str(&e->address, &address, &port);
44 x = send_request(mesh, c, "%d %x %s %d %s %s %s %d %x %d %d", ADD_EDGE, rand(),
45 e->from->name, e->from->devclass, e->to->name, address, port, e->to->devclass,
46 e->options, e->weight, contradictions);
53 bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
56 char from_name[MAX_STRING_SIZE];
58 char to_name[MAX_STRING_SIZE];
59 char to_address[MAX_STRING_SIZE];
60 char to_port[MAX_STRING_SIZE];
65 int contradictions = 0;
67 if(sscanf(request, "%*d %*x "MAX_STRING" %d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %x %d %d",
68 from_name, &from_devclass, to_name, to_address, to_port, &to_devclass, &options, &weight, &contradictions) < 8) {
69 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "ADD_EDGE", c->name);
73 /* Check if names are valid */
75 if(!check_id(from_name) || !check_id(to_name)) {
76 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "invalid name");
80 // Check if devclasses are valid
82 if(from_devclass < 0 || from_devclass > _DEV_CLASS_MAX) {
83 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "from devclass invalid");
87 if(to_devclass < 0 || to_devclass > _DEV_CLASS_MAX) {
88 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "to devclass invalid");
92 if(seen_request(mesh, request)) {
98 from = lookup_node(mesh, from_name);
99 to = lookup_node(mesh, to_name);
103 from->status.blacklisted = mesh->default_blacklist;
104 from->name = xstrdup(from_name);
105 node_add(mesh, from);
108 if(contradictions > 50) {
109 handle_duplicate_node(mesh, from);
112 from->devclass = from_devclass;
113 node_write_devclass(mesh, from);
117 to->status.blacklisted = mesh->default_blacklist;
118 to->name = xstrdup(to_name);
122 to->devclass = to_devclass;
123 node_write_devclass(mesh, to);
125 /* Convert addresses */
127 address = str2sockaddr(to_address, to_port);
129 /* Check if edge already exists */
131 e = lookup_edge(from, to);
134 if(e->weight != weight || e->options != options || sockaddrcmp(&e->address, &address)) {
135 if(from == mesh->self) {
136 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself which does not match existing entry",
137 "ADD_EDGE", c->name);
138 send_add_edge(mesh, c, e, 0);
141 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not match existing entry",
142 "ADD_EDGE", c->name);
149 } else if(from == mesh->self) {
150 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself which does not exist",
151 "ADD_EDGE", c->name);
152 mesh->contradicting_add_edge++;
156 send_del_edge(mesh, c, e, mesh->contradicting_add_edge);
164 e->address = address;
165 e->options = options;
169 /* Tell the rest about the new edge */
171 forward_request(mesh, c, request);
173 /* Run MST before or after we tell the rest? */
180 bool send_del_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e, int contradictions) {
181 return send_request(mesh, c, "%d %x %s %s %d", DEL_EDGE, rand(),
182 e->from->name, e->to->name, contradictions);
185 bool del_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
187 char from_name[MAX_STRING_SIZE];
188 char to_name[MAX_STRING_SIZE];
190 int contradictions = 0;
192 if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING" %d", from_name, to_name, &contradictions) < 2) {
193 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "DEL_EDGE", c->name);
197 /* Check if names are valid */
199 if(!check_id(from_name) || !check_id(to_name)) {
200 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "DEL_EDGE", c->name, "invalid name");
204 if(seen_request(mesh, request)) {
210 from = lookup_node(mesh, from_name);
211 to = lookup_node(mesh, to_name);
214 logger(mesh, MESHLINK_ERROR, "Got %s from %s which does not appear in the edge tree",
215 "DEL_EDGE", c->name);
220 logger(mesh, MESHLINK_ERROR, "Got %s from %s which does not appear in the edge tree",
221 "DEL_EDGE", c->name);
225 if(contradictions > 50) {
226 handle_duplicate_node(mesh, from);
229 /* Check if edge exists */
231 e = lookup_edge(from, to);
234 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not appear in the edge tree",
235 "DEL_EDGE", c->name);
239 if(e->from == mesh->self) {
240 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself",
241 "DEL_EDGE", c->name);
242 mesh->contradicting_del_edge++;
243 send_add_edge(mesh, c, e, mesh->contradicting_del_edge); /* Send back a correction */
247 /* Tell the rest about the deleted edge */
249 forward_request(mesh, c, request);
251 /* Delete the edge */
255 /* Run MST before or after we tell the rest? */
259 /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
261 if(!to->status.reachable) {
262 e = lookup_edge(to, mesh->self);
265 send_del_edge(mesh, mesh->everyone, e, 0);