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"
25 #include "meshlink_internal.h"
35 bool send_add_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e, int contradictions) {
38 const char *from_submesh, *to_submesh;
39 const submesh_t *s = NULL;
41 if(c->node && c->node->submesh) {
42 if(!submesh_allows_node(e->from->submesh, c->node)) {
46 if(!submesh_allows_node(e->to->submesh, c->node)) {
51 if(e->from->submesh && e->to->submesh && (e->from->submesh != e->to->submesh)) {
55 sockaddr2str(&e->address, &address, &port);
57 if(e->from->submesh) {
58 from_submesh = e->from->submesh->name;
60 from_submesh = CORE_MESH;
64 to_submesh = e->to->submesh->name;
66 to_submesh = CORE_MESH;
69 if(e->from->submesh) {
75 x = send_request(mesh, c, s, "%d %x %s %d %s %s %s %s %d %s %x %d %d %x", ADD_EDGE, prng(mesh, UINT_MAX),
76 e->from->name, e->from->devclass, from_submesh, e->to->name, address, port,
77 e->to->devclass, to_submesh, OPTION_PMTU_DISCOVERY, e->weight, contradictions, e->from->session_id);
85 bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
94 char from_name[MAX_STRING_SIZE];
96 char from_submesh_name[MAX_STRING_SIZE] = "";
97 char to_name[MAX_STRING_SIZE];
98 char to_address[MAX_STRING_SIZE];
99 char to_port[MAX_STRING_SIZE];
101 char to_submesh_name[MAX_STRING_SIZE] = "";
104 int contradictions = 0;
105 uint32_t session_id = 0;
108 if(sscanf(request, "%*d %*x "MAX_STRING" %d "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %d "MAX_STRING" %*x %d %d %x",
109 from_name, &from_devclass, from_submesh_name, to_name, to_address, to_port, &to_devclass, to_submesh_name,
110 &weight, &contradictions, &session_id) < 9) {
111 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "ADD_EDGE", c->name);
115 // Check if devclasses are valid
117 if(from_devclass < 0 || from_devclass >= DEV_CLASS_COUNT) {
118 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "from devclass invalid");
122 if(to_devclass < 0 || to_devclass >= DEV_CLASS_COUNT) {
123 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "to devclass invalid");
127 if(0 == strcmp(from_submesh_name, "")) {
128 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "invalid submesh id");
132 if(0 == strcmp(to_submesh_name, "")) {
133 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "invalid submesh id");
137 if(seen_request(mesh, request)) {
143 from = lookup_node(mesh, from_name);
144 to = lookup_node(mesh, to_name);
148 from->status.dirty = true;
149 from->status.blacklisted = false;
150 from->name = xstrdup(from_name);
151 from->devclass = from_devclass;
153 from->submesh = NULL;
155 if(0 != strcmp(from_submesh_name, CORE_MESH)) {
156 if(!(from->submesh = lookup_or_create_submesh(mesh, from_submesh_name))) {
161 node_add(mesh, from);
164 if(contradictions > 50) {
165 handle_duplicate_node(mesh, from);
168 from->devclass = from_devclass;
170 if(!from->session_id) {
171 from->session_id = session_id;
176 to->status.dirty = true;
177 to->status.blacklisted = false;
178 to->name = xstrdup(to_name);
179 to->devclass = to_devclass;
183 if(0 != strcmp(to_submesh_name, CORE_MESH)) {
184 if(!(to->submesh = lookup_or_create_submesh(mesh, to_submesh_name))) {
193 to->devclass = to_devclass;
195 /* Convert addresses */
197 address = str2sockaddr(to_address, to_port);
199 /* Check if edge already exists */
201 e = lookup_edge(from, to);
204 if(e->weight != weight || e->session_id != session_id || sockaddrcmp(&e->address, &address)) {
205 if(from == mesh->self) {
206 /* The sender has outdated information, we own this edge to send a correction back */
207 logger(mesh, MESHLINK_DEBUG, "Got %s from %s for ourself which does not match existing entry", "ADD_EDGE", c->name);
208 send_add_edge(mesh, c, e, 0);
210 } else if(to == mesh->self && from != c->node && from->status.reachable) {
211 /* The sender has outdated information, someone else owns this node so they will correct */
212 logger(mesh, MESHLINK_DEBUG, "Got %s from %s which does not match existing entry, ignoring", "ADD_EDGE", c->name);
215 /* Might be outdated, but update our information, another node will send a correction if necessary */
216 logger(mesh, MESHLINK_DEBUG, "Got %s from %s which does not match existing entry", "ADD_EDGE", c->name);
222 } else if(from == mesh->self) {
223 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself which does not exist", "ADD_EDGE", c->name);
224 mesh->contradicting_add_edge++;
228 e->session_id = session_id;
229 send_del_edge(mesh, c, e, mesh->contradicting_add_edge);
237 e->address = address;
239 e->session_id = session_id;
242 /* Run MST before or after we tell the rest? */
246 if(e->from->submesh && e->to->submesh && (e->from->submesh != e->to->submesh)) {
247 logger(mesh, MESHLINK_ERROR, "Dropping add edge ( %s to %s )", e->from->submesh->name, e->to->submesh->name);
251 if(e->from->submesh) {
252 s = e->from->submesh;
257 /* Tell the rest about the new edge */
259 forward_request(mesh, c, s, request);
262 /* TODO: Check if this is an edge we would own */
267 bool send_del_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e, int contradictions) {
270 if(c->node && c->node->submesh) {
271 if(!submesh_allows_node(e->from->submesh, c->node)) {
275 if(!submesh_allows_node(e->to->submesh, c->node)) {
280 if(e->from->submesh && e->to->submesh && (e->from->submesh != e->to->submesh)) {
285 if(e->from->submesh) {
286 s = e->from->submesh;
291 return send_request(mesh, c, s, "%d %x %s %s %d %x", DEL_EDGE, prng(mesh, UINT_MAX),
292 e->from->name, e->to->name, contradictions, e->session_id);
296 bool del_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
304 char from_name[MAX_STRING_SIZE];
305 char to_name[MAX_STRING_SIZE];
307 int contradictions = 0;
308 uint32_t session_id = 0;
311 if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING" %d %x", from_name, to_name, &contradictions, &session_id) < 2) {
312 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "DEL_EDGE", c->name);
316 if(seen_request(mesh, request)) {
322 from = lookup_node(mesh, from_name);
323 to = lookup_node(mesh, to_name);
326 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not appear in the edge tree", "DEL_EDGE", c->name);
331 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not appear in the edge tree", "DEL_EDGE", c->name);
335 if(contradictions > 50) {
336 handle_duplicate_node(mesh, from);
339 /* Check if edge exists */
341 e = lookup_edge(from, to);
344 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not appear in the edge tree", "DEL_EDGE", c->name);
348 if(e->from == mesh->self) {
349 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself", "DEL_EDGE", c->name);
350 mesh->contradicting_del_edge++;
351 send_add_edge(mesh, c, e, mesh->contradicting_del_edge); /* Send back a correction */
355 /* Tell the rest about the deleted edge */
358 if(!e->from->submesh || !e->to->submesh || (e->from->submesh == e->to->submesh)) {
359 if(e->from->submesh) {
360 s = e->from->submesh;
365 /* Tell the rest about the deleted edge */
366 forward_request(mesh, c, s, request);
369 logger(mesh, MESHLINK_ERROR, "Dropping del edge ( %s to %s )", e->from->submesh->name, e->to->submesh->name);
373 /* Delete the edge */
377 /* Run MST before or after we tell the rest? */
381 /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
383 if(!to->status.reachable) {
384 e = lookup_edge(to, mesh->self);
387 send_del_edge(mesh, mesh->everyone, e, 0);
394 /* TODO: Check if this is an edge we would own. */