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) {
42 sockaddr2str(&e->address, &address, &port);
44 x = send_request(mesh, c, "%d %x %s %d %s %s %s %d %x %d", ADD_EDGE, rand(),
45 e->from->name, e->from->devclass, e->to->name, address, port, e->to->devclass,
46 e->options, e->weight);
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];
66 if(sscanf(request, "%*d %*x "MAX_STRING" %d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %x %d",
67 from_name, &from_devclass, to_name, to_address, to_port, &to_devclass, &options, &weight) != 8) {
68 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "ADD_EDGE", c->name);
72 /* Check if names are valid */
74 if(!check_id(from_name) || !check_id(to_name)) {
75 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "invalid name");
79 // Check if devclasses are valid
81 if(from_devclass < 0 || from_devclass > _DEV_CLASS_MAX) {
82 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "from devclass invalid");
86 if(to_devclass < 0 || to_devclass > _DEV_CLASS_MAX) {
87 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "to devclass invalid");
91 if(seen_request(mesh, request)) {
97 from = lookup_node(mesh, from_name);
98 to = lookup_node(mesh, to_name);
102 from->status.blacklisted = mesh->default_blacklist;
103 from->name = xstrdup(from_name);
104 node_add(mesh, from);
107 from->devclass = from_devclass;
108 node_write_devclass(mesh, from);
112 to->status.blacklisted = mesh->default_blacklist;
113 to->name = xstrdup(to_name);
117 to->devclass = to_devclass;
118 node_write_devclass(mesh, to);
120 /* Convert addresses */
122 address = str2sockaddr(to_address, to_port);
124 /* Check if edge already exists */
126 e = lookup_edge(from, to);
129 if(e->weight != weight || e->options != options || sockaddrcmp(&e->address, &address)) {
130 if(from == mesh->self) {
131 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself which does not match existing entry",
132 "ADD_EDGE", c->name);
133 send_add_edge(mesh, c, e);
136 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not match existing entry",
137 "ADD_EDGE", c->name);
144 } else if(from == mesh->self) {
145 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself which does not exist",
146 "ADD_EDGE", c->name);
147 mesh->contradicting_add_edge++;
151 send_del_edge(mesh, c, e);
159 e->address = address;
160 e->options = options;
164 /* Tell the rest about the new edge */
166 forward_request(mesh, c, request);
168 /* Run MST before or after we tell the rest? */
175 bool send_del_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e) {
176 return send_request(mesh, c, "%d %x %s %s", DEL_EDGE, rand(),
177 e->from->name, e->to->name);
180 bool del_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
182 char from_name[MAX_STRING_SIZE];
183 char to_name[MAX_STRING_SIZE];
186 if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) {
187 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "DEL_EDGE", c->name);
191 /* Check if names are valid */
193 if(!check_id(from_name) || !check_id(to_name)) {
194 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "DEL_EDGE", c->name, "invalid name");
198 if(seen_request(mesh, request)) {
204 from = lookup_node(mesh, from_name);
205 to = lookup_node(mesh, to_name);
208 logger(mesh, MESHLINK_ERROR, "Got %s from %s which does not appear in the edge tree",
209 "DEL_EDGE", c->name);
214 logger(mesh, MESHLINK_ERROR, "Got %s from %s which does not appear in the edge tree",
215 "DEL_EDGE", c->name);
219 /* Check if edge exists */
221 e = lookup_edge(from, to);
224 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not appear in the edge tree",
225 "DEL_EDGE", c->name);
229 if(e->from == mesh->self) {
230 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself",
231 "DEL_EDGE", c->name);
232 mesh->contradicting_del_edge++;
233 send_add_edge(mesh, c, e); /* Send back a correction */
237 /* Tell the rest about the deleted edge */
239 forward_request(mesh, c, request);
241 /* Delete the edge */
245 /* Run MST before or after we tell the rest? */
249 /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
251 if(!to->status.reachable) {
252 e = lookup_edge(to, mesh->self);
255 send_del_edge(mesh, mesh->everyone, e);