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"
34 bool send_add_edge(meshlink_handle_t *mesh, connection_t *c, int contradictions) {
36 sockaddr2str(&c->address, &address, &port);
38 bool result = send_request(mesh, c, "%d %x %s %d %s %s %s %s %d %s %x %d %d %x", ADD_EDGE, prng(mesh, UINT_MAX),
39 mesh->self->name, mesh->self->devclass, CORE_MESH,
40 mesh->peer->name, address, port,
41 mesh->peer->devclass, CORE_MESH, 0, 1000, contradictions, mesh->peer->session_id);
49 bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
58 char from_name[MAX_STRING_SIZE];
60 char from_submesh_name[MAX_STRING_SIZE] = "";
61 char to_name[MAX_STRING_SIZE];
62 char to_address[MAX_STRING_SIZE];
63 char to_port[MAX_STRING_SIZE];
65 char to_submesh_name[MAX_STRING_SIZE] = "";
68 int contradictions = 0;
69 uint32_t session_id = 0;
72 if(sscanf(request, "%*d %*x "MAX_STRING" %d "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %d "MAX_STRING" %*x %d %d %x",
73 from_name, &from_devclass, from_submesh_name, to_name, to_address, to_port, &to_devclass, to_submesh_name,
74 &weight, &contradictions, &session_id) < 9) {
75 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "ADD_EDGE", c->name);
79 // Check if devclasses are valid
81 if(from_devclass < 0 || from_devclass >= DEV_CLASS_COUNT) {
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_COUNT) {
87 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "to devclass invalid");
91 if(0 == strcmp(from_submesh_name, "")) {
92 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "invalid submesh id");
96 if(0 == strcmp(to_submesh_name, "")) {
97 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "invalid submesh id");
101 if(seen_request(mesh, request)) {
107 from = lookup_node(mesh, from_name);
108 to = lookup_node(mesh, to_name);
112 from->status.dirty = true;
113 from->status.blacklisted = false;
114 from->name = xstrdup(from_name);
115 from->devclass = from_devclass;
117 from->submesh = NULL;
119 if(0 != strcmp(from_submesh_name, CORE_MESH)) {
120 if(!(from->submesh = lookup_or_create_submesh(mesh, from_submesh_name))) {
125 node_add(mesh, from);
128 if(contradictions > 50) {
129 handle_duplicate_node(mesh, from);
132 from->devclass = from_devclass;
134 if(!from->session_id) {
135 from->session_id = session_id;
140 to->status.dirty = true;
141 to->status.blacklisted = false;
142 to->name = xstrdup(to_name);
143 to->devclass = to_devclass;
147 if(0 != strcmp(to_submesh_name, CORE_MESH)) {
148 if(!(to->submesh = lookup_or_create_submesh(mesh, to_submesh_name))) {
157 to->devclass = to_devclass;
159 /* Convert addresses */
161 address = str2sockaddr(to_address, to_port);
163 /* Check if edge already exists */
165 e = lookup_edge(from, to);
168 if(e->weight != weight || e->session_id != session_id || sockaddrcmp(&e->address, &address)) {
169 if(from == mesh->self) {
170 /* The sender has outdated information, we own this edge to send a correction back */
171 logger(mesh, MESHLINK_DEBUG, "Got %s from %s for ourself which does not match existing entry", "ADD_EDGE", c->name);
172 send_add_edge(mesh, c, e, 0);
174 } else if(to == mesh->self && from != c->node && from->status.reachable) {
175 /* The sender has outdated information, someone else owns this node so they will correct */
176 logger(mesh, MESHLINK_DEBUG, "Got %s from %s which does not match existing entry, ignoring", "ADD_EDGE", c->name);
179 /* Might be outdated, but update our information, another node will send a correction if necessary */
180 logger(mesh, MESHLINK_DEBUG, "Got %s from %s which does not match existing entry", "ADD_EDGE", c->name);
186 } else if(from == mesh->self) {
187 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself which does not exist", "ADD_EDGE", c->name);
188 mesh->contradicting_add_edge++;
192 e->session_id = session_id;
193 send_del_edge(mesh, c, e, mesh->contradicting_add_edge);
201 e->address = address;
203 e->session_id = session_id;
206 /* Run MST before or after we tell the rest? */
210 if(e->from->submesh && e->to->submesh && (e->from->submesh != e->to->submesh)) {
211 logger(mesh, MESHLINK_ERROR, "Dropping add edge ( %s to %s )", e->from->submesh->name, e->to->submesh->name);
215 if(e->from->submesh) {
216 s = e->from->submesh;
221 /* Tell the rest about the new edge */
223 forward_request(mesh, c, s, request);
226 /* TODO: Check if this is an edge we would own */
231 bool send_del_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e, int contradictions) {
234 if(c->node && c->node->submesh) {
235 if(!submesh_allows_node(e->from->submesh, c->node)) {
239 if(!submesh_allows_node(e->to->submesh, c->node)) {
244 if(e->from->submesh && e->to->submesh && (e->from->submesh != e->to->submesh)) {
249 if(e->from->submesh) {
250 s = e->from->submesh;
255 return send_request(mesh, c, s, "%d %x %s %s %d %x", DEL_EDGE, prng(mesh, UINT_MAX),
256 e->from->name, e->to->name, contradictions, e->session_id);
260 bool del_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
268 char from_name[MAX_STRING_SIZE];
269 char to_name[MAX_STRING_SIZE];
271 int contradictions = 0;
272 uint32_t session_id = 0;
275 if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING" %d %x", from_name, to_name, &contradictions, &session_id) < 2) {
276 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "DEL_EDGE", c->name);
280 if(seen_request(mesh, request)) {
286 from = lookup_node(mesh, from_name);
287 to = lookup_node(mesh, to_name);
290 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not appear in the edge tree", "DEL_EDGE", c->name);
295 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not appear in the edge tree", "DEL_EDGE", c->name);
299 if(contradictions > 50) {
300 handle_duplicate_node(mesh, from);
303 /* Check if edge exists */
305 e = lookup_edge(from, to);
308 logger(mesh, MESHLINK_WARNING, "Got %s from %s which does not appear in the edge tree", "DEL_EDGE", c->name);
312 if(e->from == mesh->self) {
313 logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself", "DEL_EDGE", c->name);
314 mesh->contradicting_del_edge++;
315 send_add_edge(mesh, c, e, mesh->contradicting_del_edge); /* Send back a correction */
319 /* Tell the rest about the deleted edge */
322 if(!e->from->submesh || !e->to->submesh || (e->from->submesh == e->to->submesh)) {
323 if(e->from->submesh) {
324 s = e->from->submesh;
329 /* Tell the rest about the deleted edge */
330 forward_request(mesh, c, s, request);
333 logger(mesh, MESHLINK_ERROR, "Dropping del edge ( %s to %s )", e->from->submesh->name, e->to->submesh->name);
337 /* Delete the edge */
341 /* Run MST before or after we tell the rest? */
345 /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
347 if(!to->status.reachable) {
348 e = lookup_edge(to, mesh->self);
351 send_del_edge(mesh, mesh->everyone, e, 0);
358 /* TODO: Check if this is an edge we would own. */