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) {
25 for(size_t i = 0; i < (size - 1); ++i) {
26 buffer[i] = 'a' + (rand() % ('z' - 'a' + 1));
29 buffer[size - 1] = '\0';
32 static void discovery_entry_group_callback(CattaServer *server, CattaSEntryGroup *group, CattaEntryGroupState state, void *userdata) {
35 meshlink_handle_t *mesh = userdata;
39 assert(mesh->catta_server != NULL);
40 assert(mesh->catta_poll != NULL);
42 /* Called whenever the entry group state changes */
44 case CATTA_ENTRY_GROUP_ESTABLISHED:
45 /* The entry group has been established successfully */
46 logger(mesh, MESHLINK_DEBUG, "Catta Service successfully established.\n");
49 case CATTA_ENTRY_GROUP_COLLISION:
50 logger(mesh, MESHLINK_WARNING, "Catta Service collision.\n");
51 // @TODO can we just set a new name and retry?
54 case CATTA_ENTRY_GROUP_FAILURE :
55 /* Some kind of failure happened while we were registering our services */
56 logger(mesh, MESHLINK_ERROR, "Catta Entry group failure: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
57 catta_simple_poll_quit(mesh->catta_poll);
60 case CATTA_ENTRY_GROUP_UNCOMMITED:
61 case CATTA_ENTRY_GROUP_REGISTERING:
67 static void discovery_create_services(meshlink_handle_t *mesh) {
68 char *fingerprint = NULL;
69 char *txt_name = NULL;
70 char *txt_fingerprint = NULL;
74 assert(mesh->name != NULL);
75 assert(mesh->myport != NULL);
76 assert(mesh->catta_server != NULL);
77 assert(mesh->catta_poll != NULL);
78 assert(mesh->catta_servicetype != NULL);
79 assert(mesh->self != NULL);
81 pthread_mutex_lock(&(mesh->mesh_mutex));
83 logger(mesh, MESHLINK_DEBUG, "Adding service\n");
85 /* Ifthis is the first time we're called, let's create a new entry group */
86 if(!mesh->catta_group) {
87 if(!(mesh->catta_group = catta_s_entry_group_new(mesh->catta_server, discovery_entry_group_callback, mesh))) {
88 logger(mesh, MESHLINK_ERROR, "catta_entry_group_new() failed: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
93 /* Create txt records */
94 fingerprint = meshlink_get_fingerprint(mesh, (meshlink_node_t *)mesh->self);
95 xasprintf(&txt_name, "%s=%s", MESHLINK_MDNS_NAME_KEY, mesh->name);
96 xasprintf(&txt_fingerprint, "%s=%s", MESHLINK_MDNS_FINGERPRINT_KEY, fingerprint);
101 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) {
102 logger(mesh, MESHLINK_ERROR, "Failed to add service: %s\n", catta_strerror(ret));
106 /* Tell the server to register the service */
107 if((ret = catta_s_entry_group_commit(mesh->catta_group)) < 0) {
108 logger(mesh, MESHLINK_ERROR, "Failed to commit entry_group: %s\n", catta_strerror(ret));
115 catta_simple_poll_quit(mesh->catta_poll);
120 free(txt_fingerprint);
122 pthread_mutex_unlock(&(mesh->mesh_mutex));
125 static void discovery_server_callback(CattaServer *server, CattaServerState state, void *userdata) {
127 meshlink_handle_t *mesh = userdata;
130 assert(mesh != NULL);
133 case CATTA_SERVER_RUNNING:
135 /* The serve has startup successfully and registered its host
136 * name on the network, so it's time to create our services */
137 if(!mesh->catta_group) {
138 discovery_create_services(mesh);
143 case CATTA_SERVER_COLLISION: {
145 assert(mesh->catta_server != NULL);
146 assert(mesh->catta_poll != NULL);
148 /* A host name collision happened. Let's pick a new name for the server */
150 generate_rand_string(hostname, sizeof(hostname));
151 int result = catta_server_set_host_name(mesh->catta_server, hostname);
154 catta_simple_poll_quit(mesh->catta_poll);
159 case CATTA_SERVER_REGISTERING:
161 /* Let's drop our registered services. When the server is back
162 * in CATTA_SERVER_RUNNING state we will register them
163 * again with the new host name. */
164 if(mesh->catta_group) {
165 catta_s_entry_group_reset(mesh->catta_group);
166 mesh->catta_group = NULL;
171 case CATTA_SERVER_FAILURE:
173 assert(mesh->catta_server != NULL);
174 assert(mesh->catta_poll != NULL);
176 /* Terminate on failure */
177 catta_simple_poll_quit(mesh->catta_poll);
180 case CATTA_SERVER_INVALID:
185 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) {
189 meshlink_handle_t *mesh = userdata;
192 assert(resolver != NULL);
193 assert(mesh != NULL);
194 assert(mesh->catta_server != NULL);
196 /* Called whenever a service has been resolved successfully or timed out */
198 case CATTA_RESOLVER_FAILURE:
200 assert(name != NULL);
201 assert(type != NULL);
202 assert(domain != NULL);
205 case CATTA_RESOLVER_FOUND: {
207 assert(name != NULL);
208 assert(type != NULL);
209 assert(domain != NULL);
210 assert(host_name != NULL);
211 assert(address != NULL);
214 // retrieve fingerprint
215 CattaStringList *node_name_li = catta_string_list_find(txt, MESHLINK_MDNS_NAME_KEY);
216 CattaStringList *node_fp_li = catta_string_list_find(txt, MESHLINK_MDNS_FINGERPRINT_KEY);
218 if(node_name_li != NULL && node_fp_li != NULL) {
219 char *node_name = (char *)catta_string_list_get_text(node_name_li) + strlen(MESHLINK_MDNS_NAME_KEY);
220 char *node_fp = (char *)catta_string_list_get_text(node_fp_li) + strlen(MESHLINK_MDNS_FINGERPRINT_KEY);
222 if(node_name[0] == '=' && node_fp[0] == '=') {
223 pthread_mutex_lock(&(mesh->mesh_mutex));
228 meshlink_node_t *node = meshlink_get_node(mesh, node_name);
231 logger(mesh, MESHLINK_INFO, "Node %s is part of the mesh network.\n", node->name);
234 memset(&naddress, 0, sizeof(naddress));
236 switch(address->proto) {
237 case CATTA_PROTO_INET: {
238 naddress.in.sin_family = AF_INET;
239 naddress.in.sin_port = htons(port);
240 naddress.in.sin_addr.s_addr = address->data.ipv4.address;
244 case CATTA_PROTO_INET6: {
245 naddress.in6.sin6_family = AF_INET6;
246 naddress.in6.sin6_port = htons(port);
247 memcpy(naddress.in6.sin6_addr.s6_addr, address->data.ipv6.address, sizeof(naddress.in6.sin6_addr.s6_addr));
252 naddress.unknown.family = AF_UNKNOWN;
256 if(naddress.unknown.family != AF_UNKNOWN) {
257 meshlink_hint_address(mesh, (meshlink_node_t *)node, (struct sockaddr *)&naddress);
259 node_t *n = (node_t *)node;
261 if(n->connection && n->connection->outgoing) {
262 n->connection->outgoing->timeout = 0;
264 if(n->connection->outgoing->ev.cb) {
265 timeout_set(&mesh->loop, &n->connection->outgoing->ev, &(struct timeval) {
270 n->connection->last_ping_time = 0;
274 logger(mesh, MESHLINK_WARNING, "Could not resolve node %s to a known address family type.\n", node->name);
277 logger(mesh, MESHLINK_WARNING, "Node %s is not part of the mesh network.\n", node_name);
280 pthread_mutex_unlock(&(mesh->mesh_mutex));
287 catta_s_service_resolver_free(resolver);
290 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) {
293 meshlink_handle_t *mesh = userdata;
296 assert(mesh != NULL);
297 assert(mesh->catta_server != NULL);
298 assert(mesh->catta_poll != NULL);
300 /* Called whenever a new services becomes available on the LAN or is removed from the LAN */
302 case CATTA_BROWSER_FAILURE:
303 catta_simple_poll_quit(mesh->catta_poll);
306 case CATTA_BROWSER_NEW:
307 catta_s_service_resolver_new(mesh->catta_server, interface_, protocol, name, type, domain, CATTA_PROTO_UNSPEC, 0, discovery_resolve_callback, mesh);
308 pthread_mutex_lock(&mesh->mesh_mutex);
309 handle_network_change(mesh, ++mesh->catta_interfaces);
310 pthread_mutex_unlock(&mesh->mesh_mutex);
313 case CATTA_BROWSER_REMOVE:
314 pthread_mutex_lock(&mesh->mesh_mutex);
315 handle_network_change(mesh, --mesh->catta_interfaces);
316 pthread_mutex_unlock(&mesh->mesh_mutex);
319 case CATTA_BROWSER_ALL_FOR_NOW:
320 case CATTA_BROWSER_CACHE_EXHAUSTED:
325 static void discovery_log_cb(CattaLogLevel level, const char *txt) {
326 meshlink_log_level_t mlevel = MESHLINK_CRITICAL;
329 case CATTA_LOG_ERROR:
330 mlevel = MESHLINK_ERROR;
334 mlevel = MESHLINK_WARNING;
337 case CATTA_LOG_NOTICE:
339 mlevel = MESHLINK_INFO;
342 case CATTA_LOG_DEBUG:
344 mlevel = MESHLINK_DEBUG;
348 logger(NULL, mlevel, "%s\n", txt);
351 static void *discovery_loop(void *userdata) {
352 meshlink_handle_t *mesh = userdata;
353 assert(mesh != NULL);
356 catta_set_log_function(discovery_log_cb);
358 // create service type string
359 size_t servicetype_strlen = sizeof(MESHLINK_MDNS_SERVICE_TYPE) + strlen(mesh->appname) + 1;
360 mesh->catta_servicetype = malloc(servicetype_strlen);
362 if(mesh->catta_servicetype == NULL) {
363 logger(mesh, MESHLINK_ERROR, "Failed to allocate memory for service type string.\n");
367 snprintf(mesh->catta_servicetype, servicetype_strlen, MESHLINK_MDNS_SERVICE_TYPE, mesh->appname);
369 // Allocate discovery loop object
370 if(!(mesh->catta_poll = catta_simple_poll_new())) {
371 logger(mesh, MESHLINK_ERROR, "Failed to create discovery poll object.\n");
375 // generate some unique host name (we actually do not care about it)
377 generate_rand_string(hostname, sizeof(hostname));
379 // Let's set the host name for this server.
380 CattaServerConfig config;
381 catta_server_config_init(&config);
382 config.host_name = catta_strdup(hostname);
383 config.publish_workstation = 0;
384 config.disallow_other_stacks = 0;
385 config.publish_hinfo = 0;
386 config.publish_addresses = 1;
387 config.publish_no_reverse = 1;
389 /* Allocate a new server */
391 mesh->catta_server = catta_server_new(catta_simple_poll_get(mesh->catta_poll), &config, discovery_server_callback, mesh, &error);
393 /* Free the configuration data */
394 catta_server_config_free(&config);
396 /* Check wether creating the server object succeeded */
397 if(!mesh->catta_server) {
398 logger(mesh, MESHLINK_ERROR, "Failed to create discovery server: %s\n", catta_strerror(error));
402 // Create the service browser
403 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))) {
404 logger(mesh, MESHLINK_ERROR, "Failed to create discovery service browser: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
408 catta_simple_poll_loop(mesh->catta_poll);
412 if(mesh->catta_browser != NULL) {
413 catta_s_service_browser_free(mesh->catta_browser);
414 mesh->catta_browser = NULL;
417 if(mesh->catta_group) {
418 catta_s_entry_group_reset(mesh->catta_group);
419 catta_s_entry_group_free(mesh->catta_group);
420 mesh->catta_group = NULL;
423 if(mesh->catta_server != NULL) {
424 catta_server_free(mesh->catta_server);
425 mesh->catta_server = NULL;
428 if(mesh->catta_poll != NULL) {
429 catta_simple_poll_free(mesh->catta_poll);
430 mesh->catta_poll = NULL;
433 if(mesh->catta_servicetype != NULL) {
434 free(mesh->catta_servicetype);
435 mesh->catta_servicetype = NULL;
441 bool discovery_start(meshlink_handle_t *mesh) {
442 logger(mesh, MESHLINK_DEBUG, "discovery_start called\n");
445 assert(mesh != NULL);
446 assert(mesh->catta_poll == NULL);
447 assert(mesh->catta_server == NULL);
448 assert(mesh->catta_browser == NULL);
449 assert(mesh->discovery_threadstarted == false);
450 assert(mesh->catta_servicetype == NULL);
452 // Start the discovery thread
453 if(pthread_create(&mesh->discovery_thread, NULL, discovery_loop, mesh) != 0) {
454 logger(mesh, MESHLINK_ERROR, "Could not start discovery thread: %s\n", strerror(errno));
455 memset(&mesh->discovery_thread, 0, sizeof(mesh)->discovery_thread);
459 mesh->discovery_threadstarted = true;
464 void discovery_stop(meshlink_handle_t *mesh) {
465 logger(mesh, MESHLINK_DEBUG, "discovery_stop called\n");
468 assert(mesh != NULL);
471 if(mesh->catta_poll) {
472 catta_simple_poll_quit(mesh->catta_poll);
475 // Wait for the discovery thread to finish
476 if(mesh->discovery_threadstarted == true) {
477 pthread_join(mesh->discovery_thread, NULL);
478 mesh->discovery_threadstarted = false;
481 mesh->catta_interfaces = 0;