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 bool send_add_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e) {
40 sockaddr2str(&e->address, &address, &port);
42 x = send_request(mesh, c, "%d %x %s %d %s %s %s %d %x %d", ADD_EDGE, rand(),
43 e->from->name, e->from->dclass, e->to->name, address, port, e->to->dclass,
44 e->options, e->weight);
51 bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
54 char from_name[MAX_STRING_SIZE];
56 char to_name[MAX_STRING_SIZE];
57 char to_address[MAX_STRING_SIZE];
58 char to_port[MAX_STRING_SIZE];
64 if(sscanf(request, "%*d %*x "MAX_STRING" %d "MAX_STRING" "MAX_STRING" "MAX_STRING" %d %x %d",
65 from_name, &from_dclass, to_name, to_address, to_port, &to_dclass, &options, &weight) != 8) {
66 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s)", "ADD_EDGE", c->name,
71 /* Check if names are valid */
73 if(!check_id(from_name) || !check_id(to_name)) {
74 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s): %s", "ADD_EDGE", c->name,
75 c->hostname, "invalid name");
79 if(seen_request(mesh, request))
84 from = lookup_node(mesh, from_name);
85 to = lookup_node(mesh, to_name);
89 from->name = xstrdup(from_name);
90 from->dclass = from_dclass;
96 to->name = xstrdup(to_name);
97 to->dclass = to_dclass;
101 /* Convert addresses */
103 address = str2sockaddr(to_address, to_port);
105 /* Check if edge already exists */
107 e = lookup_edge(from, to);
110 if(e->weight != weight || e->options != options || sockaddrcmp(&e->address, &address)) {
111 if(from == mesh->self) {
112 logger(mesh, MESHLINK_WARNING, "Got %s from %s (%s) for ourself which does not match existing entry",
113 "ADD_EDGE", c->name, c->hostname);
114 send_add_edge(mesh, c, e);
117 logger(mesh, MESHLINK_WARNING, "Got %s from %s (%s) which does not match existing entry",
118 "ADD_EDGE", c->name, c->hostname);
124 } else if(from == mesh->self) {
125 logger(mesh, MESHLINK_WARNING, "Got %s from %s (%s) for ourself which does not exist",
126 "ADD_EDGE", c->name, c->hostname);
127 mesh->contradicting_add_edge++;
131 send_del_edge(mesh, c, e);
139 e->address = address;
140 e->options = options;
144 /* Tell the rest about the new edge */
146 forward_request(mesh, c, request);
148 /* Run MST before or after we tell the rest? */
155 bool send_del_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e) {
156 return send_request(mesh, c, "%d %x %s %s", DEL_EDGE, rand(),
157 e->from->name, e->to->name);
160 bool del_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
162 char from_name[MAX_STRING_SIZE];
163 char to_name[MAX_STRING_SIZE];
166 if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) {
167 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s)", "DEL_EDGE", c->name,
172 /* Check if names are valid */
174 if(!check_id(from_name) || !check_id(to_name)) {
175 logger(mesh, MESHLINK_ERROR, "Got bad %s from %s (%s): %s", "DEL_EDGE", c->name,
176 c->hostname, "invalid name");
180 if(seen_request(mesh, request))
185 from = lookup_node(mesh, from_name);
186 to = lookup_node(mesh, to_name);
189 logger(mesh, MESHLINK_ERROR, "Got %s from %s (%s) which does not appear in the edge tree",
190 "DEL_EDGE", c->name, c->hostname);
195 logger(mesh, MESHLINK_ERROR, "Got %s from %s (%s) which does not appear in the edge tree",
196 "DEL_EDGE", c->name, c->hostname);
200 /* Check if edge exists */
202 e = lookup_edge(from, to);
205 logger(mesh, MESHLINK_WARNING, "Got %s from %s (%s) which does not appear in the edge tree",
206 "DEL_EDGE", c->name, c->hostname);
210 if(e->from == mesh->self) {
211 logger(mesh, MESHLINK_WARNING, "Got %s from %s (%s) for ourself",
212 "DEL_EDGE", c->name, c->hostname);
213 mesh->contradicting_del_edge++;
214 send_add_edge(mesh, c, e); /* Send back a correction */
218 /* Tell the rest about the deleted edge */
220 forward_request(mesh, c, request);
222 /* Delete the edge */
226 /* Run MST before or after we tell the rest? */
230 /* If the node is not reachable anymore but we remember it had an edge to us, clean it up */
232 if(!to->status.reachable) {
233 e = lookup_edge(to, mesh->self);
235 send_del_edge(mesh, mesh->everyone, e);