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"
37 bool send_add_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e, int contradictions) {
40 char *from_submesh, *to_submesh;
43 if(c->node && c->node->submesh) {
44 if(!submesh_allows_node(e->from->submesh, c->node)) {
48 if(!submesh_allows_node(e->to->submesh, c->node)) {
53 if(e->from->submesh && e->to->submesh && (e->from->submesh != e->to->submesh)) {
57 sockaddr2str(&e->address, &address, &port);
59 if(e->from->submesh) {
60 from_submesh = e->from->submesh->name;
62 from_submesh = CORE_MESH;
66 to_submesh = e->to->submesh->name;
68 to_submesh = CORE_MESH;
71 if(e->from->submesh) {
77 x = send_request(mesh, c, s, "%d %x %s %d %s %s %s %s %d %s %x %d %d", ADD_EDGE, rand(),
78 e->from->name, e->from->devclass, from_submesh, e->to->name, address, port,
79 e->to->devclass, to_submesh, OPTION_PMTU_DISCOVERY, e->weight, contradictions);
86 bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
89 char from_name[MAX_STRING_SIZE];
91 char from_submesh_name[MAX_STRING_SIZE] = "";
92 char to_name[MAX_STRING_SIZE];
93 char to_address[MAX_STRING_SIZE];
94 char to_port[MAX_STRING_SIZE];
96 char to_submesh_name[MAX_STRING_SIZE] = "";
99 int contradictions = 0;
102 if(sscanf(request, "%*d %*x "MAX_STRING" %d "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %d "MAX_STRING" %*x %d %d",
103 from_name, &from_devclass, from_submesh_name, to_name, to_address, to_port, &to_devclass, to_submesh_name,
104 &weight, &contradictions) < 9) {
105 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "ADD_EDGE", c->name);
109 // Check if devclasses are valid
111 if(from_devclass < 0 || from_devclass > _DEV_CLASS_MAX) {
112 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "from devclass invalid");
116 if(to_devclass < 0 || to_devclass > _DEV_CLASS_MAX) {
117 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "to devclass invalid");
121 if(0 == strcmp(from_submesh_name, "")) {
122 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "invalid submesh id");
126 if(0 == strcmp(to_submesh_name, "")) {
127 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "invalid submesh id");
131 if(seen_request(mesh, request)) {
137 from = lookup_node(mesh, from_name);
138 to = lookup_node(mesh, to_name);
142 from->status.dirty = true;
143 from->status.blacklisted = mesh->default_blacklist;
144 from->name = xstrdup(from_name);
145 from->devclass = from_devclass;
147 from->submesh = NULL;
149 if(0 != strcmp(from_submesh_name, CORE_MESH)) {
150 if(!(from->submesh = lookup_or_create_submesh(mesh, from_submesh_name))) {
155 node_add(mesh, from);
158 if(contradictions > 50) {
159 handle_duplicate_node(mesh, from);
162 from->devclass = from_devclass;
166 to->status.dirty = true;
167 to->status.blacklisted = mesh->default_blacklist;
168 to->name = xstrdup(to_name);
169 to->devclass = to_devclass;
173 if(0 != strcmp(to_submesh_name, CORE_MESH)) {
174 if(!(to->submesh = lookup_or_create_submesh(mesh, to_submesh_name))) {
183 /* Convert addresses */
185 address = str2sockaddr(to_address, to_port);
187 /* Check if edge already exists */
189 e = lookup_edge(from, to);
192 if(e->weight != weight || sockaddrcmp(&e->address, &address)) {
193 if(from == mesh->self) {
194 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself which does not match existing entry",
195 "ADD_EDGE", c->name);
196 send_add_edge(mesh, c, e, 0);
199 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not match existing entry",
200 "ADD_EDGE", c->name);
207 } else if(from == mesh->self) {
208 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself which does not exist",
209 "ADD_EDGE", c->name);
210 mesh->contradicting_add_edge++;
214 send_del_edge(mesh, c, e, mesh->contradicting_add_edge);
222 e->address = address;
226 /* Run MST before or after we tell the rest? */
230 if(e->from->submesh && e->to->submesh && (e->from->submesh != e->to->submesh)) {
231 logger(mesh, MESHLINK_ERROR, "Dropping add edge ( %s to %s )", e->from->submesh->name, e->to->submesh->name);
235 if(e->from->submesh) {
236 s = e->from->submesh;
241 /* Tell the rest about the new edge */
243 forward_request(mesh, c, s, request);
248 bool send_del_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e, int contradictions) {
251 if(c->node && c->node->submesh) {
252 if(!submesh_allows_node(e->from->submesh, c->node)) {
256 if(!submesh_allows_node(e->to->submesh, c->node)) {
261 if(e->from->submesh && e->to->submesh && (e->from->submesh != e->to->submesh)) {
266 if(e->from->submesh) {
267 s = e->from->submesh;
272 return send_request(mesh, c, s, "%d %x %s %s %d", DEL_EDGE, rand(),
273 e->from->name, e->to->name, contradictions);
276 bool del_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
278 char from_name[MAX_STRING_SIZE];
279 char to_name[MAX_STRING_SIZE];
281 int contradictions = 0;
284 if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING" %d", from_name, to_name, &contradictions) < 2) {
285 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "DEL_EDGE", c->name);
289 if(seen_request(mesh, request)) {
295 from = lookup_node(mesh, from_name);
296 to = lookup_node(mesh, to_name);
299 logger(mesh, MESHLINK_ERROR, "Got %s from %s which does not appear in the edge tree",
300 "DEL_EDGE", c->name);
305 logger(mesh, MESHLINK_ERROR, "Got %s from %s which does not appear in the edge tree",
306 "DEL_EDGE", c->name);
310 if(contradictions > 50) {
311 handle_duplicate_node(mesh, from);
314 /* Check if edge exists */
316 e = lookup_edge(from, to);
319 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not appear in the edge tree",
320 "DEL_EDGE", c->name);
324 if(e->from == mesh->self) {
325 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself",
326 "DEL_EDGE", c->name);
327 mesh->contradicting_del_edge++;
328 send_add_edge(mesh, c, e, mesh->contradicting_del_edge); /* Send back a correction */
332 /* Tell the rest about the deleted edge */
335 if(!e->from->submesh || !e->to->submesh || (e->from->submesh == e->to->submesh)) {
336 if(e->from->submesh) {
337 s = e->from->submesh;
342 /* Tell the rest about the deleted edge */
343 forward_request(mesh, c, s, request);
346 logger(mesh, MESHLINK_ERROR, "Dropping del edge ( %s to %s )", e->from->submesh->name, e->to->submesh->name);
350 /* Delete the edge */
354 /* Run MST before or after we tell the rest? */
358 /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
360 if(!to->status.reachable) {
361 e = lookup_edge(to, mesh->self);
364 send_del_edge(mesh, mesh->everyone, e, 0);