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"
35 bool node_read_ecdsa_public_key(meshlink_handle_t *mesh, node_t *n) {
36 if(ecdsa_active(n->ecdsa))
39 splay_tree_t *config_tree;
42 init_configuration(&config_tree);
43 if(!read_host_config(mesh, config_tree, n->name))
46 /* First, check for simple ECDSAPublicKey statement */
48 if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
49 n->ecdsa = ecdsa_set_base64_public_key(p);
54 exit_configuration(&config_tree);
58 bool read_ecdsa_public_key(meshlink_handle_t *mesh, connection_t *c) {
59 if(ecdsa_active(c->ecdsa))
65 init_configuration(&c->config_tree);
66 if(!read_host_config(mesh, c->config_tree, c->name))
70 /* First, check for simple ECDSAPublicKey statement */
72 if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
73 c->ecdsa = ecdsa_set_base64_public_key(p);
81 bool read_ecdsa_private_key(meshlink_handle_t *mesh) {
83 char filename[PATH_MAX];
85 snprintf(filename,PATH_MAX, "%s" SLASH "ecdsa_key.priv", mesh->confbase);
86 fp = fopen(filename, "rb");
89 logger(mesh, MESHLINK_ERROR, "Error reading ECDSA private key file: %s", strerror(errno));
93 mesh->self->connection->ecdsa = ecdsa_read_pem_private_key(fp);
96 if(!mesh->self->connection->ecdsa)
97 logger(mesh, MESHLINK_ERROR, "Reading ECDSA private key file failed: %s", strerror(errno));
99 return mesh->self->connection->ecdsa;
102 static bool read_invitation_key(meshlink_handle_t *mesh) {
104 char filename[PATH_MAX];
106 if(mesh->invitation_key) {
107 ecdsa_free(mesh->invitation_key);
108 mesh->invitation_key = NULL;
111 snprintf(filename,PATH_MAX, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
113 fp = fopen(filename, "rb");
116 mesh->invitation_key = ecdsa_read_pem_private_key(fp);
118 if(!mesh->invitation_key)
119 logger(mesh, MESHLINK_ERROR, "Reading ECDSA private key file `%s' failed: %s", filename, strerror(errno));
122 return mesh->invitation_key;
125 bool node_read_devclass(meshlink_handle_t *mesh, node_t *n) {
127 splay_tree_t *config_tree;
130 init_configuration(&config_tree);
131 if(!read_host_config(mesh, config_tree, n->name))
134 if(get_config_string(lookup_config(config_tree, "DeviceClass"), &p))
136 n->devclass = atoi(p);
140 if(n->devclass < 0 || n->devclass > _DEV_CLASS_MAX)
141 { n->devclass = _DEV_CLASS_MAX; }
144 exit_configuration(&config_tree);
145 return n->devclass != 0;
148 bool node_write_devclass(meshlink_handle_t *mesh, node_t *n) {
150 if(n->devclass < 0 || n->devclass > _DEV_CLASS_MAX)
155 splay_tree_t *config_tree;
156 init_configuration(&config_tree);
158 // ignore read errors; in case the file does not exist we will create it
159 read_host_config(mesh, config_tree, n->name);
161 config_t* cnf = lookup_config(config_tree, "DeviceClass");
166 cnf->variable = xstrdup("DeviceClass");
167 config_add(config_tree, cnf);
170 set_config_int(cnf, n->devclass);
172 if(!write_host_config(mesh, config_tree, n->name))
178 exit_configuration(&config_tree);
182 void load_all_nodes(meshlink_handle_t *mesh) {
185 char dname[PATH_MAX];
187 snprintf(dname,PATH_MAX, "%s" SLASH "hosts", mesh->confbase);
188 dir = opendir(dname);
190 logger(mesh, MESHLINK_ERROR, "Could not open %s: %s", dname, strerror(errno));
194 while((ent = readdir(dir))) {
195 if(!check_id(ent->d_name))
198 node_t *n = lookup_node(mesh, ent->d_name);
203 n->name = xstrdup(ent->d_name);
204 node_read_devclass(mesh, n);
212 char *get_name(meshlink_handle_t *mesh) {
215 get_config_string(lookup_config(mesh->config, "Name"), &name);
220 if(!check_id(name)) {
221 logger(mesh, MESHLINK_ERROR, "Invalid name for mesh->self!");
229 bool setup_myself_reloadable(meshlink_handle_t *mesh) {
230 mesh->localdiscovery = true;
231 keylifetime = 3600; // TODO: check if this can be removed as well
232 mesh->maxtimeout = 900;
233 mesh->self->options |= OPTION_PMTU_DISCOVERY;
235 read_invitation_key(mesh);
241 Add listening sockets.
243 static bool add_listen_address(meshlink_handle_t *mesh, char *address, bool bindto) {
244 char *port = mesh->myport;
247 char *space = strchr(address, ' ');
253 if(!strcmp(address, "*"))
257 struct addrinfo *ai, hint = {0};
258 hint.ai_family = addressfamily;
259 hint.ai_socktype = SOCK_STREAM;
260 hint.ai_protocol = IPPROTO_TCP;
261 hint.ai_flags = AI_PASSIVE;
263 int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
267 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
271 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
272 // Ignore duplicate addresses
275 for(int i = 0; i < mesh->listen_sockets; i++)
276 if(!memcmp(&mesh->listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
284 if(mesh->listen_sockets >= MAXSOCKETS) {
285 logger(mesh, MESHLINK_ERROR, "Too many listening sockets");
289 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
294 int udp_fd = setup_vpn_in_socket(mesh, (sockaddr_t *) aip->ai_addr);
301 io_add(&mesh->loop, &mesh->listen_socket[mesh->listen_sockets].tcp, handle_new_meta_connection, &mesh->listen_socket[mesh->listen_sockets], tcp_fd, IO_READ);
302 io_add(&mesh->loop, &mesh->listen_socket[mesh->listen_sockets].udp, handle_incoming_vpn_data, &mesh->listen_socket[mesh->listen_sockets], udp_fd, IO_READ);
304 if(mesh->log_level >= MESHLINK_INFO) {
305 char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
306 logger(mesh, MESHLINK_INFO, "Listening on %s", hostname);
310 mesh->listen_socket[mesh->listen_sockets].bindto = bindto;
311 memcpy(&mesh->listen_socket[mesh->listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
312 mesh->listen_sockets++;
320 Configure node_t mesh->self and set up the local sockets (listen only)
322 bool setup_myself(meshlink_handle_t *mesh) {
324 char *address = NULL;
326 if(!(name = get_name(mesh))) {
327 logger(mesh, MESHLINK_ERROR, "Name for MeshLink instance required!");
331 mesh->self = new_node();
332 mesh->self->connection = new_connection();
333 mesh->self->name = name;
334 mesh->self->devclass = mesh->devclass;
335 mesh->self->connection->name = xstrdup(name);
336 read_host_config(mesh, mesh->config, name);
338 if(!get_config_string(lookup_config(mesh->config, "Port"), &mesh->myport)) {
339 logger(mesh, MESHLINK_ERROR, "Port for MeshLink instance required!");
343 mesh->self->connection->options = 0;
344 mesh->self->connection->protocol_major = PROT_MAJOR;
345 mesh->self->connection->protocol_minor = PROT_MINOR;
347 mesh->self->options |= PROT_MINOR << 24;
349 if(!read_ecdsa_private_key(mesh))
352 /* Ensure mesh->myport is numeric */
354 if(!atoi(mesh->myport)) {
355 struct addrinfo *ai = str2addrinfo("localhost", mesh->myport, SOCK_DGRAM);
357 if(!ai || !ai->ai_addr)
360 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
361 sockaddr2str(&sa, NULL, &mesh->myport);
364 /* Check some options */
366 if(!setup_myself_reloadable(mesh))
371 // TODO: drop compression in the packet layer?
372 mesh->self->incompression = 0;
373 mesh->self->connection->outcompression = 0;
377 mesh->self->nexthop = mesh->self;
378 mesh->self->via = mesh->self;
379 mesh->self->status.reachable = true;
380 mesh->self->last_state_change = mesh->loop.now.tv_sec;
382 node_write_devclass(mesh, mesh->self);
383 node_add(mesh, mesh->self);
387 load_all_nodes(mesh);
391 mesh->listen_sockets = 0;
393 if(!add_listen_address(mesh, address, NULL))
396 if(!mesh->listen_sockets) {
397 logger(mesh, MESHLINK_ERROR, "Unable to create any listening socket!");
401 xasprintf(&mesh->self->hostname, "MYSELF port %s", mesh->myport);
402 mesh->self->connection->hostname = xstrdup(mesh->self->hostname);
406 mesh->last_config_check = mesh->loop.now.tv_sec;
414 bool setup_network(meshlink_handle_t *mesh) {
415 init_connections(mesh);
420 mesh->pinginterval = 60;
421 mesh->pingtimeout = 5;
422 maxoutbufsize = 10 * MTU;
424 if(!setup_myself(mesh))
431 close all open network connections
433 void close_network_connections(meshlink_handle_t *mesh) {
434 if(mesh->connections) {
435 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
437 connection_t *c = node->data;
439 terminate_connection(mesh, c, false);
444 list_delete_list(mesh->outgoings);
446 if(mesh->self && mesh->self->connection) {
447 terminate_connection(mesh, mesh->self->connection, false);
448 free_connection(mesh->self->connection);
451 for(int i = 0; i < mesh->listen_sockets; i++) {
452 io_del(&mesh->loop, &mesh->listen_socket[i].tcp);
453 io_del(&mesh->loop, &mesh->listen_socket[i].udp);
454 close(mesh->listen_socket[i].tcp.fd);
455 close(mesh->listen_socket[i].udp.fd);
461 exit_connections(mesh);
463 if(mesh->myport) free(mesh->myport);