3 #include <catta/core.h>
4 #include <catta/lookup.h>
5 #include <catta/publish.h>
7 #include <catta/simple-watch.h>
8 #include <catta/malloc.h>
9 #include <catta/alternative.h>
10 #include <catta/error.h>
12 #include "meshlink_internal.h"
13 #include "discovery.h"
17 #include "connection.h"
20 #define MESHLINK_MDNS_SERVICE_TYPE "_%s._tcp"
21 #define MESHLINK_MDNS_NAME_KEY "name"
22 #define MESHLINK_MDNS_FINGERPRINT_KEY "fingerprint"
24 static void generate_rand_string(char *buffer, size_t size) {
27 for(size_t i = 0; i < (size - 1); ++i) {
28 buffer[i] = 'a' + (rand() % ('z' - 'a' + 1));
31 buffer[size - 1] = '\0';
34 static void discovery_entry_group_callback(CattaServer *server, CattaSEntryGroup *group, CattaEntryGroupState state, void *userdata) {
37 meshlink_handle_t *mesh = userdata;
40 assert(mesh->catta_server);
41 assert(mesh->catta_poll);
43 /* Called whenever the entry group state changes */
45 case CATTA_ENTRY_GROUP_ESTABLISHED:
46 /* The entry group has been established successfully */
47 logger(mesh, MESHLINK_DEBUG, "Catta Service successfully established.\n");
50 case CATTA_ENTRY_GROUP_COLLISION:
51 logger(mesh, MESHLINK_WARNING, "Catta Service collision.\n");
52 // @TODO can we just set a new name and retry?
55 case CATTA_ENTRY_GROUP_FAILURE :
56 /* Some kind of failure happened while we were registering our services */
57 logger(mesh, MESHLINK_ERROR, "Catta Entry group failure: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
58 catta_simple_poll_quit(mesh->catta_poll);
61 case CATTA_ENTRY_GROUP_UNCOMMITED:
62 case CATTA_ENTRY_GROUP_REGISTERING:
68 static void discovery_create_services(meshlink_handle_t *mesh) {
69 char *fingerprint = NULL;
70 char *txt_name = NULL;
71 char *txt_fingerprint = NULL;
76 assert(mesh->catta_server);
77 assert(mesh->catta_poll);
78 assert(mesh->catta_servicetype);
81 logger(mesh, MESHLINK_DEBUG, "Adding service\n");
83 /* Ifthis is the first time we're called, let's create a new entry group */
84 if(!(mesh->catta_group = catta_s_entry_group_new(mesh->catta_server, discovery_entry_group_callback, mesh))) {
85 logger(mesh, MESHLINK_ERROR, "catta_entry_group_new() failed: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
89 /* Create txt records */
90 fingerprint = meshlink_get_fingerprint(mesh, (meshlink_node_t *)mesh->self);
91 xasprintf(&txt_name, "%s=%s", MESHLINK_MDNS_NAME_KEY, mesh->name);
92 xasprintf(&txt_fingerprint, "%s=%s", MESHLINK_MDNS_FINGERPRINT_KEY, fingerprint);
97 if((ret = catta_server_add_service(mesh->catta_server, mesh->catta_group, CATTA_IF_UNSPEC, CATTA_PROTO_UNSPEC, 0, fingerprint, mesh->catta_servicetype, NULL, NULL, atoi(mesh->myport), txt_name, txt_fingerprint, NULL)) < 0) {
98 logger(mesh, MESHLINK_ERROR, "Failed to add service: %s\n", catta_strerror(ret));
102 /* Tell the server to register the service */
103 if((ret = catta_s_entry_group_commit(mesh->catta_group)) < 0) {
104 logger(mesh, MESHLINK_ERROR, "Failed to commit entry_group: %s\n", catta_strerror(ret));
111 catta_simple_poll_quit(mesh->catta_poll);
116 free(txt_fingerprint);
118 pthread_mutex_unlock(&(mesh->mesh_mutex));
121 static void discovery_server_callback(CattaServer *server, CattaServerState state, void *userdata) {
123 meshlink_handle_t *mesh = userdata;
128 case CATTA_SERVER_RUNNING:
129 /* The serve has startup successfully and registered its host
130 * name on the network, so it's time to create our services */
131 pthread_mutex_lock(&(mesh->mesh_mutex));
133 if(!mesh->catta_group) {
134 discovery_create_services(mesh);
137 pthread_mutex_unlock(&(mesh->mesh_mutex));
141 case CATTA_SERVER_COLLISION: {
142 /* A host name collision happened. Let's pick a new name for the server */
144 generate_rand_string(hostname, sizeof(hostname));
146 pthread_mutex_lock(&(mesh->mesh_mutex));
148 assert(mesh->catta_server);
149 assert(mesh->catta_poll);
151 int result = catta_server_set_host_name(mesh->catta_server, hostname);
154 catta_simple_poll_quit(mesh->catta_poll);
157 pthread_mutex_unlock(&(mesh->mesh_mutex));
161 case CATTA_SERVER_REGISTERING:
162 pthread_mutex_lock(&(mesh->mesh_mutex));
164 /* Let's drop our registered services. When the server is back
165 * in CATTA_SERVER_RUNNING state we will register them
166 * again with the new host name. */
167 if(mesh->catta_group) {
168 catta_s_entry_group_reset(mesh->catta_group);
169 mesh->catta_group = NULL;
172 pthread_mutex_unlock(&(mesh->mesh_mutex));
176 case CATTA_SERVER_FAILURE:
177 pthread_mutex_lock(&(mesh->mesh_mutex));
179 assert(mesh->catta_server);
180 assert(mesh->catta_poll);
182 /* Terminate on failure */
183 catta_simple_poll_quit(mesh->catta_poll);
185 pthread_mutex_unlock(&(mesh->mesh_mutex));
188 case CATTA_SERVER_INVALID:
193 static void discovery_resolve_callback(CattaSServiceResolver *resolver, CattaIfIndex interface_, CattaProtocol protocol, CattaResolverEvent event, const char *name, const char *type, const char *domain, const char *host_name, const CattaAddress *address, uint16_t port, CattaStringList *txt, CattaLookupResultFlags flags, void *userdata) {
202 meshlink_handle_t *mesh = userdata;
206 if(event != CATTA_RESOLVER_FOUND) {
207 catta_s_service_resolver_free(resolver);
211 // retrieve fingerprint
212 CattaStringList *node_name_li = catta_string_list_find(txt, MESHLINK_MDNS_NAME_KEY);
213 CattaStringList *node_fp_li = catta_string_list_find(txt, MESHLINK_MDNS_FINGERPRINT_KEY);
215 if(node_name_li && node_fp_li) {
216 char *node_name = (char *)catta_string_list_get_text(node_name_li) + strlen(MESHLINK_MDNS_NAME_KEY);
217 char *node_fp = (char *)catta_string_list_get_text(node_fp_li) + strlen(MESHLINK_MDNS_FINGERPRINT_KEY);
219 if(node_name[0] == '=' && node_fp[0] == '=') {
220 pthread_mutex_lock(&(mesh->mesh_mutex));
224 meshlink_node_t *node = meshlink_get_node(mesh, node_name);
227 logger(mesh, MESHLINK_INFO, "Node %s is part of the mesh network.\n", node->name);
230 memset(&naddress, 0, sizeof(naddress));
232 switch(address->proto) {
233 case CATTA_PROTO_INET: {
234 naddress.in.sin_family = AF_INET;
235 naddress.in.sin_port = htons(port);
236 naddress.in.sin_addr.s_addr = address->data.ipv4.address;
240 case CATTA_PROTO_INET6: {
241 naddress.in6.sin6_family = AF_INET6;
242 naddress.in6.sin6_port = htons(port);
243 memcpy(naddress.in6.sin6_addr.s6_addr, address->data.ipv6.address, sizeof(naddress.in6.sin6_addr.s6_addr));
248 naddress.unknown.family = AF_UNKNOWN;
252 if(naddress.unknown.family != AF_UNKNOWN) {
253 meshlink_hint_address(mesh, (meshlink_node_t *)node, (struct sockaddr *)&naddress);
255 node_t *n = (node_t *)node;
257 if(n->connection && n->connection->outgoing) {
258 n->connection->outgoing->timeout = 0;
260 if(n->connection->outgoing->ev.cb) {
261 timeout_set(&mesh->loop, &n->connection->outgoing->ev, &(struct timeval) {
266 n->connection->last_ping_time = 0;
270 logger(mesh, MESHLINK_WARNING, "Could not resolve node %s to a known address family type.\n", node->name);
273 logger(mesh, MESHLINK_WARNING, "Node %s is not part of the mesh network.\n", node_name);
276 pthread_mutex_unlock(&(mesh->mesh_mutex));
280 catta_s_service_resolver_free(resolver);
283 static void discovery_browse_callback(CattaSServiceBrowser *browser, CattaIfIndex interface_, CattaProtocol protocol, CattaBrowserEvent event, const char *name, const char *type, const char *domain, CattaLookupResultFlags flags, void *userdata) {
286 meshlink_handle_t *mesh = userdata;
288 /* Called whenever a new services becomes available on the LAN or is removed from the LAN */
290 case CATTA_BROWSER_FAILURE:
291 pthread_mutex_lock(&mesh->mesh_mutex);
292 catta_simple_poll_quit(mesh->catta_poll);
293 pthread_mutex_unlock(&mesh->mesh_mutex);
296 case CATTA_BROWSER_NEW:
297 pthread_mutex_lock(&mesh->mesh_mutex);
298 catta_s_service_resolver_new(mesh->catta_server, interface_, protocol, name, type, domain, CATTA_PROTO_UNSPEC, 0, discovery_resolve_callback, mesh);
299 handle_network_change(mesh, ++mesh->catta_interfaces);
300 pthread_mutex_unlock(&mesh->mesh_mutex);
303 case CATTA_BROWSER_REMOVE:
304 pthread_mutex_lock(&mesh->mesh_mutex);
305 handle_network_change(mesh, --mesh->catta_interfaces);
306 pthread_mutex_unlock(&mesh->mesh_mutex);
309 case CATTA_BROWSER_ALL_FOR_NOW:
310 case CATTA_BROWSER_CACHE_EXHAUSTED:
315 static void discovery_log_cb(CattaLogLevel level, const char *txt) {
316 meshlink_log_level_t mlevel = MESHLINK_CRITICAL;
319 case CATTA_LOG_ERROR:
320 mlevel = MESHLINK_ERROR;
324 mlevel = MESHLINK_WARNING;
327 case CATTA_LOG_NOTICE:
329 mlevel = MESHLINK_INFO;
332 case CATTA_LOG_DEBUG:
334 mlevel = MESHLINK_DEBUG;
338 logger(NULL, mlevel, "%s\n", txt);
341 static void *discovery_loop(void *userdata) {
343 meshlink_handle_t *mesh = userdata;
347 catta_set_log_function(discovery_log_cb);
349 // create service type string
350 char appname[strlen(mesh->appname) + 2];
351 strcpy(appname, mesh->appname);
353 for(char *p = appname; *p; p++) {
354 if(!isalnum(*p) && *p != '_' && *p != '-') {
364 size_t servicetype_strlen = sizeof(MESHLINK_MDNS_SERVICE_TYPE) + strlen(appname) + 1;
365 mesh->catta_servicetype = malloc(servicetype_strlen);
367 if(mesh->catta_servicetype == NULL) {
368 logger(mesh, MESHLINK_ERROR, "Failed to allocate memory for service type string.\n");
372 snprintf(mesh->catta_servicetype, servicetype_strlen, MESHLINK_MDNS_SERVICE_TYPE, appname);
374 // Allocate discovery loop object
375 if(!(mesh->catta_poll = catta_simple_poll_new())) {
376 logger(mesh, MESHLINK_ERROR, "Failed to create discovery poll object.\n");
380 // generate some unique host name (we actually do not care about it)
382 generate_rand_string(hostname, sizeof(hostname));
384 // Let's set the host name for this server.
385 CattaServerConfig config;
386 catta_server_config_init(&config);
387 config.host_name = catta_strdup(hostname);
388 config.publish_workstation = 0;
389 config.disallow_other_stacks = 0;
390 config.publish_hinfo = 0;
391 config.publish_addresses = 1;
392 config.publish_no_reverse = 1;
394 /* Allocate a new server */
396 mesh->catta_server = catta_server_new(catta_simple_poll_get(mesh->catta_poll), &config, discovery_server_callback, mesh, &error);
398 /* Free the configuration data */
399 catta_server_config_free(&config);
401 /* Check wether creating the server object succeeded */
402 if(!mesh->catta_server) {
403 logger(mesh, MESHLINK_ERROR, "Failed to create discovery server: %s\n", catta_strerror(error));
407 // Create the service browser
408 if(!(mesh->catta_browser = catta_s_service_browser_new(mesh->catta_server, CATTA_IF_UNSPEC, CATTA_PROTO_UNSPEC, mesh->catta_servicetype, NULL, 0, discovery_browse_callback, mesh))) {
409 logger(mesh, MESHLINK_ERROR, "Failed to create discovery service browser: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
417 pthread_mutex_lock(&mesh->discovery_mutex);
418 pthread_cond_broadcast(&mesh->discovery_cond);
419 pthread_mutex_unlock(&mesh->discovery_mutex);
422 catta_simple_poll_loop(mesh->catta_poll);
425 if(mesh->catta_browser) {
426 catta_s_service_browser_free(mesh->catta_browser);
427 mesh->catta_browser = NULL;
430 if(mesh->catta_group) {
431 catta_s_entry_group_reset(mesh->catta_group);
432 catta_s_entry_group_free(mesh->catta_group);
433 mesh->catta_group = NULL;
436 if(mesh->catta_server) {
437 catta_server_free(mesh->catta_server);
438 mesh->catta_server = NULL;
441 if(mesh->catta_poll) {
442 catta_simple_poll_free(mesh->catta_poll);
443 mesh->catta_poll = NULL;
446 if(mesh->catta_servicetype) {
447 free(mesh->catta_servicetype);
448 mesh->catta_servicetype = NULL;
454 bool discovery_start(meshlink_handle_t *mesh) {
455 logger(mesh, MESHLINK_DEBUG, "discovery_start called\n");
458 assert(!mesh->catta_poll);
459 assert(!mesh->catta_server);
460 assert(!mesh->catta_browser);
461 assert(!mesh->discovery_threadstarted);
462 assert(!mesh->catta_servicetype);
464 // Start the discovery thread
465 if(pthread_create(&mesh->discovery_thread, NULL, discovery_loop, mesh) != 0) {
466 logger(mesh, MESHLINK_ERROR, "Could not start discovery thread: %s\n", strerror(errno));
467 memset(&mesh->discovery_thread, 0, sizeof(mesh)->discovery_thread);
471 pthread_mutex_lock(&mesh->discovery_mutex);
472 pthread_cond_wait(&mesh->discovery_cond, &mesh->discovery_mutex);
473 pthread_mutex_unlock(&mesh->discovery_mutex);
475 mesh->discovery_threadstarted = true;
480 void discovery_stop(meshlink_handle_t *mesh) {
481 logger(mesh, MESHLINK_DEBUG, "discovery_stop called\n");
486 if(mesh->catta_poll) {
487 catta_simple_poll_quit(mesh->catta_poll);
490 // Wait for the discovery thread to finish
491 if(mesh->discovery_threadstarted == true) {
492 pthread_join(mesh->discovery_thread, NULL);
493 mesh->discovery_threadstarted = false;
496 mesh->catta_interfaces = 0;