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"
37 /// Helper function to start parsing a host config file
38 static bool node_get_config(meshlink_handle_t *mesh, node_t *n, config_t *config, packmsg_input_t *in) {
39 if(!config_read(mesh, n->name, config)) {
43 in->ptr = config->buf;
44 in->len = config->len;
46 uint32_t version = packmsg_get_uint32(in);
48 if(version != MESHLINK_CONFIG_VERSION) {
54 uint32_t len = packmsg_get_str_raw(in, &name);
56 if(len != strlen(n->name) || strncmp(name, n->name, len)) {
64 /// Read device class, blacklist status and submesh from a host config file. Used at startup when reading all host config files.
65 bool node_read_partial(meshlink_handle_t *mesh, node_t *n) {
69 if(!node_get_config(mesh, n, &config, &in)) {
73 char *submesh_name = packmsg_get_str_dup(&in);
75 if(!strcmp(submesh_name, CORE_MESH)) {
79 n->submesh = lookup_or_create_submesh(mesh, submesh_name);
88 int32_t devclass = packmsg_get_int32(&in);
89 bool blacklisted = packmsg_get_bool(&in);
92 if(!packmsg_input_ok(&in) || devclass < 0 || devclass > _DEV_CLASS_MAX) {
96 n->devclass = devclass;
97 n->status.blacklisted = blacklisted;
101 /// Read the public key from a host config file. Used whenever we need to start an SPTPS session.
102 bool node_read_public_key(meshlink_handle_t *mesh, node_t *n) {
103 if(ecdsa_active(n->ecdsa)) {
110 if(!node_get_config(mesh, n, &config, &in)) {
114 packmsg_skip_element(&in); /* submesh */
115 packmsg_get_int32(&in); /* devclass */
116 packmsg_get_bool(&in); /* blacklisted */
119 uint32_t len = packmsg_get_bin_raw(&in, &key);
122 config_free(&config);
126 n->ecdsa = ecdsa_set_public_key(key);
127 config_free(&config);
131 /// Fill in node details from a config blob.
132 bool node_read_from_config(meshlink_handle_t *mesh, node_t *n, const config_t *config) {
133 if(n->canonical_address) {
137 packmsg_input_t in = {config->buf, config->len};
138 uint32_t version = packmsg_get_uint32(&in);
140 if(version != MESHLINK_CONFIG_VERSION) {
144 char *name = packmsg_get_str_dup(&in);
151 if(strcmp(n->name, name)) {
161 char *submesh_name = packmsg_get_str_dup(&in);
163 if(!strcmp(submesh_name, CORE_MESH)) {
167 n->submesh = lookup_or_create_submesh(mesh, submesh_name);
175 n->devclass = packmsg_get_int32(&in);
176 n->status.blacklisted = packmsg_get_bool(&in);
178 uint32_t len = packmsg_get_bin_raw(&in, &key);
184 if(!ecdsa_active(n->ecdsa)) {
185 n->ecdsa = ecdsa_set_public_key(key);
188 n->canonical_address = packmsg_get_str_dup(&in);
189 uint32_t count = packmsg_get_array(&in);
195 for(uint32_t i = 0; i < count; i++) {
196 n->recent[i] = packmsg_get_sockaddr(&in);
199 return packmsg_done(&in);
202 bool node_write_config(meshlink_handle_t *mesh, node_t *n) {
204 packmsg_output_t out = {buf, sizeof(buf)};
206 packmsg_add_uint32(&out, MESHLINK_CONFIG_VERSION);
207 packmsg_add_str(&out, n->name);
208 packmsg_add_str(&out, n->submesh ? n->submesh->name : CORE_MESH);
209 packmsg_add_int32(&out, n->devclass);
210 assert(n->devclass != 3);
211 packmsg_add_bool(&out, n->status.blacklisted);
213 if(ecdsa_active(n->ecdsa)) {
214 packmsg_add_bin(&out, ecdsa_get_public_key(n->ecdsa), 32);
216 packmsg_add_bin(&out, "", 0);
219 packmsg_add_str(&out, n->canonical_address ? n->canonical_address : "");
223 for(uint32_t i = 0; i < 5; i++) {
224 if(n->recent[i].sa.sa_family) {
231 packmsg_add_array(&out, count);
233 for(uint32_t i = 0; i < count; i++) {
234 packmsg_add_sockaddr(&out, &n->recent[i]);
237 if(!packmsg_output_ok(&out)) {
241 config_t config = {buf, packmsg_output_size(&out, buf)};
242 return config_write(mesh, n->name, &config);
245 static void load_node(meshlink_handle_t *mesh, const char *name) {
246 if(!check_id(name)) {
250 node_t *n = lookup_node(mesh, name);
257 n->name = xstrdup(name);
259 if(!node_read_partial(mesh, n)) {
268 Add listening sockets.
270 static bool add_listen_address(meshlink_handle_t *mesh, char *address, bool bindto) {
271 char *port = mesh->myport;
274 char *space = strchr(address, ' ');
281 if(!strcmp(address, "*")) {
288 struct addrinfo hint = {
289 .ai_family = addressfamily,
290 .ai_socktype = SOCK_STREAM,
291 .ai_protocol = IPPROTO_TCP,
292 .ai_flags = AI_PASSIVE,
295 int err = getaddrinfo(address && *address ? address : NULL, port, &hint, &ai);
300 logger(mesh, MESHLINK_ERROR, "System call `%s' failed: %s", "getaddrinfo", err == EAI_SYSTEM ? strerror(err) : gai_strerror(err));
304 bool success = false;
306 for(struct addrinfo *aip = ai; aip; aip = aip->ai_next) {
307 // Ignore duplicate addresses
310 for(int i = 0; i < mesh->listen_sockets; i++)
311 if(!memcmp(&mesh->listen_socket[i].sa, aip->ai_addr, aip->ai_addrlen)) {
320 if(mesh->listen_sockets >= MAXSOCKETS) {
321 logger(mesh, MESHLINK_ERROR, "Too many listening sockets");
325 int tcp_fd = setup_listen_socket((sockaddr_t *) aip->ai_addr);
331 int udp_fd = setup_vpn_in_socket(mesh, (sockaddr_t *) aip->ai_addr);
338 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);
339 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);
341 if(mesh->log_level >= MESHLINK_INFO) {
342 char *hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr);
343 logger(mesh, MESHLINK_INFO, "Listening on %s", hostname);
347 mesh->listen_socket[mesh->listen_sockets].bindto = bindto;
348 memcpy(&mesh->listen_socket[mesh->listen_sockets].sa, aip->ai_addr, aip->ai_addrlen);
349 mesh->listen_sockets++;
358 Configure node_t mesh->self and set up the local sockets (listen only)
360 bool setup_myself(meshlink_handle_t *mesh) {
361 /* Set some defaults */
363 mesh->localdiscovery = true;
364 keylifetime = 3600; // TODO: check if this can be removed as well
365 mesh->maxtimeout = 900;
366 mesh->self->options |= OPTION_PMTU_DISCOVERY;
370 mesh->self->nexthop = mesh->self;
371 mesh->self->via = mesh->self;
372 mesh->self->status.reachable = true;
373 mesh->self->last_state_change = mesh->loop.now.tv_sec;
375 node_add(mesh, mesh->self);
379 config_scan_all(mesh, load_node);
383 mesh->listen_sockets = 0;
385 if(!add_listen_address(mesh, NULL, NULL)) {
386 if(strcmp(mesh->myport, "0")) {
387 logger(mesh, MESHLINK_INFO, "Could not bind to port %s, asking OS to choose one for us", mesh->myport);
389 mesh->myport = strdup("0");
395 if(!add_listen_address(mesh, NULL, NULL)) {
403 if(!mesh->listen_sockets) {
404 logger(mesh, MESHLINK_ERROR, "Unable to create any listening socket!");
410 mesh->last_config_check = mesh->loop.now.tv_sec;
418 bool setup_network(meshlink_handle_t *mesh) {
419 init_connections(mesh);
420 init_submeshes(mesh);
425 mesh->pinginterval = 60;
426 mesh->pingtimeout = 5;
427 maxoutbufsize = 10 * MTU;
429 if(!setup_myself(mesh)) {
437 close all open network connections
439 void close_network_connections(meshlink_handle_t *mesh) {
440 if(mesh->connections) {
441 for(list_node_t *node = mesh->connections->head, *next; node; node = next) {
443 connection_t *c = node->data;
445 terminate_connection(mesh, c, false);
449 for(int i = 0; i < mesh->listen_sockets; i++) {
450 io_del(&mesh->loop, &mesh->listen_socket[i].tcp);
451 io_del(&mesh->loop, &mesh->listen_socket[i].udp);
452 close(mesh->listen_socket[i].tcp.fd);
453 close(mesh->listen_socket[i].udp.fd);
459 exit_connections(mesh);