+ // asserts
+ assert(mesh != NULL);
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ switch(state) {
+ case CATTA_SERVER_RUNNING: {
+ /* The serve has startup successfully and registered its host
+ * name on the network, so it's time to create our services */
+ if(!mesh->catta_group) {
+ discovery_create_services(mesh);
+ }
+ }
+ break;
+
+ case CATTA_SERVER_COLLISION: {
+ // asserts
+ assert(mesh->catta_server != NULL);
+ assert(mesh->catta_poll != NULL);
+
+ /* A host name collision happened. Let's pick a new name for the server */
+ char hostname[17];
+ generate_rand_string(hostname, sizeof(hostname));
+
+ logger(mesh, MESHLINK_WARNING, "Catta host name collision, retrying with '%s'\n", hostname);
+ int result = catta_server_set_host_name(mesh->catta_server, hostname);
+
+ if(result < 0) {
+ logger(mesh, MESHLINK_ERROR, "Catta failed to set new host name: %s\n", catta_strerror(result));
+ catta_simple_poll_quit(mesh->catta_poll);
+ }
+ }
+ break;
+
+ case CATTA_SERVER_REGISTERING: {
+ /* Let's drop our registered services. When the server is back
+ * in CATTA_SERVER_RUNNING state we will register them
+ * again with the new host name. */
+ if(mesh->catta_group) {
+ catta_s_entry_group_reset(mesh->catta_group);
+ mesh->catta_group = NULL;
+ }
+ }
+ break;
+
+ case CATTA_SERVER_FAILURE: {
+ // asserts
+ assert(mesh->catta_server != NULL);
+ assert(mesh->catta_poll != NULL);
+
+ /* Terminate on failure */
+ logger(mesh, MESHLINK_ERROR, "Catta server failure: %s\n", catta_strerror(catta_server_errno(mesh->catta_server)));
+ catta_simple_poll_quit(mesh->catta_poll);
+ }
+ break;
+
+ case CATTA_SERVER_INVALID:
+ break;
+ }
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));
+}
+
+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) {
+ (void)interface_;
+ (void)protocol;
+ meshlink_handle_t *mesh = userdata;
+
+ // asserts
+ assert(resolver != NULL);
+ assert(mesh != NULL);
+ assert(mesh->catta_server != NULL);
+
+ pthread_mutex_lock(&(mesh->mesh_mutex));
+
+ /* Called whenever a service has been resolved successfully or timed out */
+ switch(event) {
+ case CATTA_RESOLVER_FAILURE: {
+ // asserts
+ assert(name != NULL);
+ assert(type != NULL);
+ assert(domain != NULL);
+
+ logger(mesh, MESHLINK_WARNING, "(Resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain, catta_strerror(catta_server_errno(mesh->catta_server)));
+ }
+ break;
+
+ case CATTA_RESOLVER_FOUND: {
+ // asserts
+ assert(name != NULL);
+ assert(type != NULL);
+ assert(domain != NULL);
+ assert(host_name != NULL);
+ assert(address != NULL);
+ assert(txt != NULL);
+
+ char straddr[CATTA_ADDRESS_STR_MAX], *strtxt;
+
+ logger(mesh, MESHLINK_DEBUG, "(Resolver) Service '%s' of type '%s' in domain '%s':\n", name, type, domain);
+
+ catta_address_snprint(straddr, sizeof(straddr), address);
+ strtxt = catta_string_list_to_string(txt);
+ logger(mesh, MESHLINK_DEBUG,
+ "\t%s:%u (%s)\n"
+ "\tTXT=%s\n"
+ "\tcookie is %u\n"
+ "\tis_local: %i\n"
+ "\twide_area: %i\n"
+ "\tmulticast: %i\n"
+ "\tcached: %i\n",
+ host_name, port, straddr,
+ strtxt,
+ catta_string_list_get_service_cookie(txt),
+ !!(flags & CATTA_LOOKUP_RESULT_LOCAL),
+ !!(flags & CATTA_LOOKUP_RESULT_WIDE_AREA),
+ !!(flags & CATTA_LOOKUP_RESULT_MULTICAST),
+ !!(flags & CATTA_LOOKUP_RESULT_CACHED));
+ catta_free(strtxt);
+
+ // retrieve fingerprint
+ CattaStringList *node_name_li = catta_string_list_find(txt, MESHLINK_MDNS_NAME_KEY);
+ CattaStringList *node_fp_li = catta_string_list_find(txt, MESHLINK_MDNS_FINGERPRINT_KEY);
+
+ if(node_name_li != NULL && node_fp_li != NULL) {
+ char *node_name = (char *)catta_string_list_get_text(node_name_li) + strlen(MESHLINK_MDNS_NAME_KEY);
+ char *node_fp = (char *)catta_string_list_get_text(node_fp_li) + strlen(MESHLINK_MDNS_FINGERPRINT_KEY);
+
+ if(node_name[0] == '=' && node_fp[0] == '=') {
+ node_name += 1;
+ node_fp += 1;
+
+ meshlink_node_t *node = meshlink_get_node(mesh, node_name);
+
+ if(node != NULL) {
+ logger(mesh, MESHLINK_INFO, "Node %s is part of the mesh network.\n", node->name);
+
+ sockaddr_t naddress;
+ memset(&naddress, 0, sizeof(naddress));
+
+ switch(address->proto) {
+ case CATTA_PROTO_INET: {
+ naddress.in.sin_family = AF_INET;
+ naddress.in.sin_port = htons(port);
+ naddress.in.sin_addr.s_addr = address->data.ipv4.address;
+ }
+ break;
+
+ case CATTA_PROTO_INET6: {
+ naddress.in6.sin6_family = AF_INET6;
+ naddress.in6.sin6_port = htons(port);
+ memcpy(naddress.in6.sin6_addr.s6_addr, address->data.ipv6.address, sizeof(naddress.in6.sin6_addr.s6_addr));
+ }
+ break;
+
+ default:
+ naddress.unknown.family = AF_UNKNOWN;
+ break;
+ }
+
+ if(naddress.unknown.family != AF_UNKNOWN) {
+ meshlink_hint_address(mesh, (meshlink_node_t *)node, (struct sockaddr *)&naddress);
+ } else {
+ logger(mesh, MESHLINK_WARNING, "Could not resolve node %s to a known address family type.\n", node->name);
+ }
+ } else {
+ logger(mesh, MESHLINK_WARNING, "Node %s is not part of the mesh network.\n", node_name);
+ }
+ } else {
+ logger(mesh, MESHLINK_WARNING, "TXT records invalid.\n");
+ }
+ } else {
+ logger(mesh, MESHLINK_WARNING, "TXT records missing.\n");
+ }
+ }
+ break;
+ }
+
+ catta_s_service_resolver_free(resolver);
+
+ pthread_mutex_unlock(&(mesh->mesh_mutex));