3 Copyright (C) 2014-2017 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"
34 bool node_read_ecdsa_public_key(meshlink_handle_t *mesh, node_t *n) {
35 if(ecdsa_active(n->ecdsa)) {
39 splay_tree_t *config_tree;
42 init_configuration(&config_tree);
44 if(!read_host_config(mesh, config_tree, n->name)) {
48 /* First, check for simple ECDSAPublicKey statement */
50 if(get_config_string(lookup_config(config_tree, "ECDSAPublicKey"), &p)) {
51 n->ecdsa = ecdsa_set_base64_public_key(p);
56 exit_configuration(&config_tree);
60 bool read_ecdsa_public_key(meshlink_handle_t *mesh, connection_t *c) {
61 if(ecdsa_active(c->ecdsa)) {
68 init_configuration(&c->config_tree);
70 if(!read_host_config(mesh, c->config_tree, c->name)) {
75 /* First, check for simple ECDSAPublicKey statement */
77 if(get_config_string(lookup_config(c->config_tree, "ECDSAPublicKey"), &p)) {
78 c->ecdsa = ecdsa_set_base64_public_key(p);
86 bool read_ecdsa_private_key(meshlink_handle_t *mesh) {
88 char filename[PATH_MAX];
90 snprintf(filename, PATH_MAX, "%s" SLASH "ecdsa_key.priv", mesh->confbase);
91 fp = fopen(filename, "rb");
94 logger(mesh, MESHLINK_ERROR, "Error reading ECDSA private key file: %s", strerror(errno));
98 mesh->self->connection->ecdsa = ecdsa_read_pem_private_key(fp);
101 if(!mesh->self->connection->ecdsa) {
102 logger(mesh, MESHLINK_ERROR, "Reading ECDSA private key file failed: %s", strerror(errno));
105 return mesh->self->connection->ecdsa;
108 static bool read_invitation_key(meshlink_handle_t *mesh) {
110 char filename[PATH_MAX];
112 if(mesh->invitation_key) {
113 ecdsa_free(mesh->invitation_key);
114 mesh->invitation_key = NULL;
117 snprintf(filename, PATH_MAX, "%s" SLASH "invitations" SLASH "ecdsa_key.priv", mesh->confbase);
119 fp = fopen(filename, "rb");
122 mesh->invitation_key = ecdsa_read_pem_private_key(fp);
125 if(!mesh->invitation_key) {
126 logger(mesh, MESHLINK_ERROR, "Reading ECDSA private key file `%s' failed: %s", filename, strerror(errno));
130 return mesh->invitation_key;
133 bool node_read_devclass(meshlink_handle_t *mesh, node_t *n) {
135 splay_tree_t *config_tree;
138 init_configuration(&config_tree);
140 if(!read_host_config(mesh, config_tree, n->name)) {
144 if(get_config_string(lookup_config(config_tree, "DeviceClass"), &p)) {
145 n->devclass = atoi(p);
149 if((int)n->devclass < 0 || n->devclass > _DEV_CLASS_MAX) {
150 n->devclass = _DEV_CLASS_MAX;
154 exit_configuration(&config_tree);
155 return n->devclass != 0;
158 bool node_write_devclass(meshlink_handle_t *mesh, node_t *n) {
160 if((int)n->devclass < 0 || n->devclass > _DEV_CLASS_MAX) {
166 splay_tree_t *config_tree;
167 init_configuration(&config_tree);
169 // ignore read errors; in case the file does not exist we will create it
170 read_host_config(mesh, config_tree, n->name);
172 config_t *cnf = lookup_config(config_tree, "DeviceClass");
176 cnf->variable = xstrdup("DeviceClass");
177 config_add(config_tree, cnf);
180 set_config_int(cnf, n->devclass);
182 if(!write_host_config(mesh, config_tree, n->name)) {
189 exit_configuration(&config_tree);
193 void load_all_nodes(meshlink_handle_t *mesh) {
196 char dname[PATH_MAX];
198 snprintf(dname, PATH_MAX, "%s" SLASH "hosts", mesh->confbase);
199 dir = opendir(dname);
202 logger(mesh, MESHLINK_ERROR, "Could not open %s: %s", dname, strerror(errno));
206 while((ent = readdir(dir))) {
207 if(!check_id(ent->d_name)) {
211 node_t *n = lookup_node(mesh, ent->d_name);
218 n->name = xstrdup(ent->d_name);
219 node_read_devclass(mesh, n);
227 char *get_name(meshlink_handle_t *mesh) {
230 get_config_string(lookup_config(mesh->config, "Name"), &name);
236 if(!check_id(name)) {
237 logger(mesh, MESHLINK_ERROR, "Invalid name for mesh->self!");
245 bool setup_myself_reloadable(meshlink_handle_t *mesh) {
246 mesh->localdiscovery = true;
247 keylifetime = 3600; // TODO: check if this can be removed as well
248 mesh->maxtimeout = 900;
249 mesh->self->options |= OPTION_PMTU_DISCOVERY;
251 read_invitation_key(mesh);
257 Add listening sockets.
259 static bool add_listen_address(meshlink_handle_t *mesh, char *address, bool bindto) {
260 char *port = mesh->myport;
263 char *space = strchr(address, ' ');
270 if(!strcmp(address, "*")) {
277 struct addrinfo hint = {
278 .ai_family = addressfamily,
279 .ai_socktype = SOCK_STREAM,
280 .ai_protocol = IPPROTO_TCP,
281 .ai_flags = AI_PASSIVE,
284 int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
289 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
293 bool success = false;
295 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
296 // Ignore duplicate addresses
299 for(int i = 0; i < mesh->listen_sockets; i++)
300 if(!memcmp(&mesh->listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
309 if(mesh->listen_sockets >= MAXSOCKETS) {
310 logger(mesh, MESHLINK_ERROR, "Too many listening sockets");
314 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
320 int udp_fd = setup_vpn_in_socket(mesh, (sockaddr_t *) aip->ai_addr);
327 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);
328 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);
330 if(mesh->log_level >= MESHLINK_INFO) {
331 char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
332 logger(mesh, MESHLINK_INFO, "Listening on %s", hostname);
336 mesh->listen_socket[mesh->listen_sockets].bindto = bindto;
337 memcpy(&mesh->listen_socket[mesh->listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
338 mesh->listen_sockets++;
347 Configure node_t mesh->self and set up the local sockets (listen only)
349 bool setup_myself(meshlink_handle_t *mesh) {
351 char *address = NULL;
353 if(!(name = get_name(mesh))) {
354 logger(mesh, MESHLINK_ERROR, "Name for MeshLink instance required!");
358 mesh->self = new_node();
359 mesh->self->connection = new_connection();
360 mesh->self->name = name;
361 mesh->self->devclass = mesh->devclass;
362 mesh->self->connection->name = xstrdup(name);
363 read_host_config(mesh, mesh->config, name);
365 if(!get_config_string(lookup_config(mesh->config, "Port"), &mesh->myport)) {
366 int port = check_port(mesh);
372 xasprintf(&mesh->myport, "%d", port);
375 mesh->self->connection->options = 0;
376 mesh->self->connection->protocol_major = PROT_MAJOR;
377 mesh->self->connection->protocol_minor = PROT_MINOR;
379 mesh->self->options |= PROT_MINOR << 24;
381 if(!read_ecdsa_private_key(mesh)) {
385 /* Ensure mesh->myport is numeric */
387 if(!atoi(mesh->myport)) {
388 struct addrinfo *ai = str2addrinfo("localhost", mesh->myport, SOCK_DGRAM);
391 if(!ai || !ai->ai_addr) {
396 memcpy(&sa, ai->ai_addr, ai->ai_addrlen);
397 sockaddr2str(&sa, NULL, &mesh->myport);
400 /* Check some options */
402 if(!setup_myself_reloadable(mesh)) {
408 // TODO: drop compression in the packet layer?
409 mesh->self->incompression = 0;
410 mesh->self->connection->outcompression = 0;
414 mesh->self->nexthop = mesh->self;
415 mesh->self->via = mesh->self;
416 mesh->self->status.reachable = true;
417 mesh->self->last_state_change = mesh->loop.now.tv_sec;
419 node_write_devclass(mesh, mesh->self);
420 node_add(mesh, mesh->self);
424 load_all_nodes(mesh);
428 mesh->listen_sockets = 0;
430 if(!add_listen_address(mesh, address, NULL)) {
431 if(strcmp(mesh->myport, "0")) {
432 logger(mesh, MESHLINK_INFO, "Could not bind to port %s, asking OS to choose one for us", mesh->myport);
434 mesh->myport = strdup("0");
440 if(!add_listen_address(mesh, address, NULL)) {
448 if(!mesh->listen_sockets) {
449 logger(mesh, MESHLINK_ERROR, "Unable to create any listening socket!");
455 mesh->last_config_check = mesh->loop.now.tv_sec;
463 bool setup_network(meshlink_handle_t *mesh) {
464 init_connections(mesh);
469 mesh->pinginterval = 60;
470 mesh->pingtimeout = 5;
472 if(!setup_myself(mesh)) {
480 close all open network connections
482 void close_network_connections(meshlink_handle_t *mesh) {
483 if(mesh->connections) {
484 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
486 connection_t *c = node->data;
488 terminate_connection(mesh, c, false);
492 if(mesh->outgoings) {
493 list_delete_list(mesh->outgoings);
496 if(mesh->self && mesh->self->connection) {
497 terminate_connection(mesh, mesh->self->connection, false);
498 free_connection(mesh->self->connection);
501 for(int i = 0; i < mesh->listen_sockets; i++) {
502 io_del(&mesh->loop, &mesh->listen_socket[i].tcp);
503 io_del(&mesh->loop, &mesh->listen_socket[i].udp);
504 close(mesh->listen_socket[i].tcp.fd);
505 close(mesh->listen_socket[i].udp.fd);
511 exit_connections(mesh);