AvahiSServiceResolver *avahi_s_service_resolver_new( AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const char *name, const char *type, const char *domain, AvahiProtocol aprotocol, AvahiLookupFlags flags, AvahiSServiceResolverCallback callback, void* userdata) { AvahiSServiceResolver *r; AvahiKey *k; char n[AVAHI_DOMAIN_NAME_MAX]; int ret; assert(server); assert(type); assert(callback); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(aprotocol), AVAHI_ERR_INVALID_PROTOCOL); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !name || avahi_is_valid_service_name(name), AVAHI_ERR_INVALID_SERVICE_NAME); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, avahi_is_valid_service_type_strict(type), AVAHI_ERR_INVALID_SERVICE_TYPE); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST|AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), AVAHI_ERR_INVALID_FLAGS); if (!domain) domain = server->domain_name; if ((ret = avahi_service_name_join(n, sizeof(n), name, type, domain)) < 0) { avahi_server_set_errno(server, ret); return NULL; } if (!(r = avahi_new(AvahiSServiceResolver, 1))) { avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY); return NULL; } r->server = server; r->service_name = avahi_strdup(name); r->service_type = avahi_normalize_name_strdup(type); r->domain_name = avahi_normalize_name_strdup(domain); r->callback = callback; r->userdata = userdata; r->address_protocol = aprotocol; r->srv_record = r->txt_record = r->address_record = NULL; r->srv_flags = r->txt_flags = r->address_flags = 0; r->interface = interface; r->protocol = protocol; r->user_flags = flags; r->record_browser_a = r->record_browser_aaaa = r->record_browser_srv = r->record_browser_txt = NULL; r->time_event = NULL; AVAHI_LLIST_PREPEND(AvahiSServiceResolver, resolver, server->service_resolvers, r); k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV); r->record_browser_srv = avahi_s_record_browser_new(server, interface, protocol, k, flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r); avahi_key_unref(k); if (!r->record_browser_srv) { avahi_s_service_resolver_free(r); return NULL; } if (!(flags & AVAHI_LOOKUP_NO_TXT)) { k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT); r->record_browser_txt = avahi_s_record_browser_new(server, interface, protocol, k, flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r); avahi_key_unref(k); if (!r->record_browser_txt) { avahi_s_service_resolver_free(r); return NULL; } } start_timeout(r); return r; }
static void record_browser_callback( AvahiSRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, AvahiLookupResultFlags flags, void* userdata) { AvahiSServiceResolver *r = userdata; assert(rr); assert(r); if (rr == r->record_browser_aaaa || rr == r->record_browser_a) r->address_flags = flags; else if (rr == r->record_browser_srv) r->srv_flags = flags; else if (rr == r->record_browser_txt) r->txt_flags = flags; switch (event) { case AVAHI_BROWSER_NEW: { int changed = 0; assert(record); if (r->interface > 0 && interface > 0 && interface != r->interface) return; if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol) return; if (r->interface <= 0) r->interface = interface; if (r->protocol == AVAHI_PROTO_UNSPEC) r->protocol = protocol; switch (record->key->type) { case AVAHI_DNS_TYPE_SRV: if (!r->srv_record) { r->srv_record = avahi_record_ref(record); changed = 1; if (r->record_browser_a) { avahi_s_record_browser_free(r->record_browser_a); r->record_browser_a = NULL; } if (r->record_browser_aaaa) { avahi_s_record_browser_free(r->record_browser_aaaa); r->record_browser_aaaa = NULL; } if (!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS)) { if (r->address_protocol == AVAHI_PROTO_INET || r->address_protocol == AVAHI_PROTO_UNSPEC) { AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A); r->record_browser_a = avahi_s_record_browser_new(r->server, r->interface, r->protocol, k, r->user_flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r); avahi_key_unref(k); } if (r->address_protocol == AVAHI_PROTO_INET6 || r->address_protocol == AVAHI_PROTO_UNSPEC) { AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA); r->record_browser_aaaa = avahi_s_record_browser_new(r->server, r->interface, r->protocol, k, r->user_flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r); avahi_key_unref(k); } } } break; case AVAHI_DNS_TYPE_TXT: assert(!(r->user_flags & AVAHI_LOOKUP_NO_TXT)); if (!r->txt_record) { r->txt_record = avahi_record_ref(record); changed = 1; } break; case AVAHI_DNS_TYPE_A: case AVAHI_DNS_TYPE_AAAA: assert(!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS)); if (!r->address_record) { r->address_record = avahi_record_ref(record); changed = 1; } break; default: abort(); } if (changed && r->srv_record && (r->txt_record || (r->user_flags & AVAHI_LOOKUP_NO_TXT)) && (r->address_record || (r->user_flags & AVAHI_LOOKUP_NO_ADDRESS))) finish(r, AVAHI_RESOLVER_FOUND); break; } case AVAHI_BROWSER_REMOVE: assert(record); switch (record->key->type) { case AVAHI_DNS_TYPE_SRV: if (r->srv_record && avahi_record_equal_no_ttl(record, r->srv_record)) { avahi_record_unref(r->srv_record); r->srv_record = NULL; if (r->record_browser_a) { avahi_s_record_browser_free(r->record_browser_a); r->record_browser_a = NULL; } if (r->record_browser_aaaa) { avahi_s_record_browser_free(r->record_browser_aaaa); r->record_browser_aaaa = NULL; } /** Look for a replacement */ avahi_s_record_browser_restart(r->record_browser_srv); start_timeout(r); } break; case AVAHI_DNS_TYPE_TXT: assert(!(r->user_flags & AVAHI_LOOKUP_NO_TXT)); if (r->txt_record && avahi_record_equal_no_ttl(record, r->txt_record)) { avahi_record_unref(r->txt_record); r->txt_record = NULL; /** Look for a replacement */ avahi_s_record_browser_restart(r->record_browser_txt); start_timeout(r); } break; case AVAHI_DNS_TYPE_A: case AVAHI_DNS_TYPE_AAAA: assert(!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS)); if (r->address_record && avahi_record_equal_no_ttl(record, r->address_record)) { avahi_record_unref(r->address_record); r->address_record = NULL; /** Look for a replacement */ if (r->record_browser_aaaa) avahi_s_record_browser_restart(r->record_browser_aaaa); if (r->record_browser_a) avahi_s_record_browser_restart(r->record_browser_a); start_timeout(r); } break; default: abort(); } break; case AVAHI_BROWSER_CACHE_EXHAUSTED: case AVAHI_BROWSER_ALL_FOR_NOW: break; case AVAHI_BROWSER_FAILURE: if (rr == r->record_browser_a && r->record_browser_aaaa) { /* We were looking for both AAAA and A, and the other query is still living, so we'll not die */ avahi_s_record_browser_free(r->record_browser_a); r->record_browser_a = NULL; break; } if (rr == r->record_browser_aaaa && r->record_browser_a) { /* We were looking for both AAAA and A, and the other query is still living, so we'll not die */ avahi_s_record_browser_free(r->record_browser_aaaa); r->record_browser_aaaa = NULL; break; } /* Hmm, everything's lost, tell the user */ if (r->record_browser_srv) avahi_s_record_browser_free(r->record_browser_srv); if (r->record_browser_txt) avahi_s_record_browser_free(r->record_browser_txt); if (r->record_browser_a) avahi_s_record_browser_free(r->record_browser_a); if (r->record_browser_aaaa) avahi_s_record_browser_free(r->record_browser_aaaa); r->record_browser_srv = r->record_browser_txt = r->record_browser_a = r->record_browser_aaaa = NULL; finish(r, AVAHI_RESOLVER_FAILURE); break; } }
AvahiSAddressResolver *avahi_s_address_resolver_new( AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const AvahiAddress *address, AvahiLookupFlags flags, AvahiSAddressResolverCallback callback, void* userdata) { AvahiSAddressResolver *r; AvahiKey *k; char n[AVAHI_DOMAIN_NAME_MAX]; assert(server); assert(address); assert(callback); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, address->proto == AVAHI_PROTO_INET || address->proto == AVAHI_PROTO_INET6, AVAHI_ERR_INVALID_PROTOCOL); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST|AVAHI_LOOKUP_USE_LLMNR), AVAHI_ERR_INVALID_FLAGS); avahi_reverse_lookup_name(address, n, sizeof(n)); if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR))) { avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY); return NULL; } if (!(r = avahi_new(AvahiSAddressResolver, 1))) { avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY); avahi_key_unref(k); return NULL; } r->server = server; r->address = *address; r->callback = callback; r->userdata = userdata; r->ptr_record = NULL; r->interface = interface; r->protocol = protocol; r->flags = 0; r->retry_with_multicast = 0; r->retry_with_llmnr = 0; r->llmnr_has_record = 0; r->key = k; r->record_browser = NULL; AVAHI_LLIST_PREPEND(AvahiSAddressResolver, resolver, server->address_resolvers, r); r->time_event = NULL; if (!(flags & (AVAHI_LOOKUP_USE_MULTICAST|AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_LLMNR))) { if (!server->wide_area.wide_area_lookup_engine || !avahi_wide_area_has_servers(server->wide_area.wide_area_lookup_engine)) flags |= AVAHI_LOOKUP_USE_LLMNR; else { flags |= AVAHI_LOOKUP_USE_WIDE_AREA; r->retry_with_llmnr = 1; } r->retry_with_multicast = 1; } r->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, r); if (!r->record_browser) { avahi_s_address_resolver_free(r); return NULL; } start_timeout(r); return r; }
static void record_browser_callback( AvahiSRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, AvahiLookupResultFlags flags, void* userdata) { AvahiSAddressResolver *r = userdata; assert(rr); assert(r); switch (event) { case AVAHI_BROWSER_NEW: assert(record); assert(record->key->type == AVAHI_DNS_TYPE_PTR); if (flags & AVAHI_LOOKUP_RESULT_LLMNR) r->llmnr_has_record = 1; if (r->interface > 0 && interface != r->interface) return; if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol) return; if (r->interface <= 0) r->interface = interface; if (r->protocol == AVAHI_PROTO_UNSPEC) r->protocol = protocol; if (!r->ptr_record) { r->ptr_record = avahi_record_ref(record); r->flags = flags; finish(r, AVAHI_RESOLVER_FOUND); } break; case AVAHI_BROWSER_REMOVE: assert(record); assert(record->key->type == AVAHI_DNS_TYPE_PTR); if (r->ptr_record && avahi_record_equal_no_ttl(record, r->ptr_record)) { avahi_record_unref(r->ptr_record); r->ptr_record = NULL; r->flags = flags; /** Look for a replacement */ avahi_s_record_browser_restart(r->record_browser); start_timeout(r); } break; case AVAHI_BROWSER_CACHE_EXHAUSTED: break; case AVAHI_BROWSER_ALL_FOR_NOW: /* when called by _LLMNR we trigger lookup by _MULTICAST*/ if ((flags & AVAHI_LOOKUP_RESULT_LLMNR) && (r->retry_with_multicast) && !r->llmnr_has_record) { r->retry_with_multicast = 0; avahi_s_record_browser_free(r->record_browser); r->record_browser = avahi_s_record_browser_new(r->server, r->interface, r->protocol, r->key, AVAHI_LOOKUP_USE_MULTICAST, record_browser_callback, r); if (r->record_browser) { start_timeout(r); break; } } break; case AVAHI_BROWSER_FAILURE: if (r->retry_with_llmnr) { r->retry_with_llmnr = 0; avahi_s_record_browser_free(r->record_browser); r->record_browser = avahi_s_record_browser_new(r->server, r->interface, r->protocol, r->key, AVAHI_LOOKUP_USE_LLMNR, record_browser_callback, r); if (r->record_browser) { start_timeout(r); break; } } break; } }
AvahiSDomainBrowser *avahi_s_domain_browser_new( AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const char *domain, AvahiDomainBrowserType type, AvahiLookupFlags flags, AvahiSDomainBrowserCallback callback, void* userdata) { static const char * const type_table[AVAHI_DOMAIN_BROWSER_MAX] = { "b", "db", "r", "dr", "lb" }; AvahiSDomainBrowser *b; AvahiKey *k = NULL; char n[AVAHI_DOMAIN_NAME_MAX]; int r; assert(server); assert(callback); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, type < AVAHI_DOMAIN_BROWSER_MAX, AVAHI_ERR_INVALID_FLAGS); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME); AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS); if (!domain) domain = server->domain_name; if ((r = avahi_service_name_join(n, sizeof(n), type_table[type], "_dns-sd._udp", domain)) < 0) { avahi_server_set_errno(server, r); return NULL; } if (!(b = avahi_new(AvahiSDomainBrowser, 1))) { avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY); return NULL; } b->ref = 1; b->server = server; b->callback = callback; b->userdata = userdata; b->record_browser = NULL; b->type = type; b->all_for_now_scheduled = 0; b->defer_event = NULL; AVAHI_LLIST_PREPEND(AvahiSDomainBrowser, browser, server->domain_browsers, b); if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR))) { avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY); goto fail; } if (!(b->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, b))) goto fail; avahi_key_unref(k); if (type == AVAHI_DOMAIN_BROWSER_BROWSE && b->server->config.browse_domains) b->defer_event = avahi_time_event_new(server->time_event_queue, NULL, defer_callback, b); return b; fail: if (k) avahi_key_unref(k); avahi_s_domain_browser_free(b); return NULL; }