1 #include <sys/socket.h>
4 #include <sys/utsname.h>
11 #include "subscribe.h"
13 static void handle_query_key(flxServer *s, flxKey *k, flxInterface *i, const flxAddress *a) {
22 g_message("Handling query: %s", txt = flx_key_to_string(k));
25 flx_packet_scheduler_incoming_query(i->scheduler, k);
27 if (k->type == FLX_DNS_TYPE_ANY) {
29 /* Handle ANY query */
31 for (e = s->entries; e; e = e->entry_next)
32 if (flx_key_pattern_match(k, e->record->key))
33 if (flx_interface_match(i, e->interface, e->protocol))
34 flx_interface_post_response(i, a, e->record, FALSE);
37 /* Handle all other queries */
39 for (e = g_hash_table_lookup(s->rrset_by_key, k); e; e = e->by_key_next)
40 if (flx_interface_match(i, e->interface, e->protocol))
41 flx_interface_post_response(i, a, e->record, FALSE);
45 static void handle_query(flxServer *s, flxDnsPacket *p, flxInterface *i, const flxAddress *a) {
53 for (n = flx_dns_packet_get_field(p, DNS_FIELD_QDCOUNT); n > 0; n --) {
56 if (!(key = flx_dns_packet_consume_key(p))) {
57 g_warning("Packet too short");
61 handle_query_key(s, key, i, a);
65 /* Known Answer Suppresion */
66 for (n = flx_dns_packet_get_field(p, DNS_FIELD_ANCOUNT); n > 0; n --) {
68 gboolean unique = FALSE;
70 if (!(record = flx_dns_packet_consume_record(p, &unique))) {
71 g_warning("Packet too short (2)");
75 flx_packet_scheduler_incoming_known_answer(i->scheduler, record, a);
76 flx_record_unref(record);
80 static void handle_response(flxServer *s, flxDnsPacket *p, flxInterface *i, const flxAddress *a) {
88 for (n = flx_dns_packet_get_field(p, DNS_FIELD_ANCOUNT) +
89 flx_dns_packet_get_field(p, DNS_FIELD_ARCOUNT); n > 0; n--) {
91 gboolean cache_flush = FALSE;
94 if (!(record = flx_dns_packet_consume_record(p, &cache_flush))) {
95 g_warning("Packet too short (3)");
99 if (record->key->type == FLX_DNS_TYPE_ANY)
102 g_message("Handling response: %s", txt = flx_record_to_string(record));
105 flx_cache_update(i->cache, record, cache_flush, a);
107 flx_packet_scheduler_incoming_response(i->scheduler, record);
108 flx_record_unref(record);
112 static void dispatch_packet(flxServer *s, flxDnsPacket *p, struct sockaddr *sa, gint iface, gint ttl) {
121 g_message("new packet recieved.");
123 if (!(i = flx_interface_monitor_get_interface(s->monitor, iface, sa->sa_family))) {
124 g_warning("Recieved packet from invalid interface.");
129 g_warning("Recieved packet with invalid TTL on interface '%s.%i'.", i->hardware->name, i->protocol);
133 if (sa->sa_family == AF_INET6) {
134 static const unsigned char ipv4_in_ipv6[] = {
135 0x00, 0x00, 0x00, 0x00,
136 0x00, 0x00, 0x00, 0x00,
137 0xFF, 0xFF, 0xFF, 0xFF };
139 if (memcmp(((struct sockaddr_in6*) sa)->sin6_addr.s6_addr, ipv4_in_ipv6, sizeof(ipv4_in_ipv6)) == 0) {
141 /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */
146 if (flx_dns_packet_check_valid(p) < 0) {
147 g_warning("Recieved invalid packet.");
151 flx_address_from_sockaddr(sa, &a);
153 if (flx_dns_packet_is_query(p)) {
155 if (flx_dns_packet_get_field(p, DNS_FIELD_QDCOUNT) == 0 ||
156 flx_dns_packet_get_field(p, DNS_FIELD_ARCOUNT) != 0 ||
157 flx_dns_packet_get_field(p, DNS_FIELD_NSCOUNT) != 0) {
158 g_warning("Invalid query packet.");
162 handle_query(s, p, i, &a);
163 g_message("Handled query");
165 if (flx_dns_packet_get_field(p, DNS_FIELD_QDCOUNT) != 0 ||
166 flx_dns_packet_get_field(p, DNS_FIELD_ANCOUNT) == 0 ||
167 flx_dns_packet_get_field(p, DNS_FIELD_NSCOUNT) != 0) {
168 g_warning("Invalid response packet.");
172 handle_response(s, p, i, &a);
173 g_message("Handled response");
177 static gboolean work(flxServer *s) {
178 struct sockaddr_in6 sa6;
179 struct sockaddr_in sa;
186 if (s->pollfd_ipv4.revents & G_IO_IN) {
187 if ((p = flx_recv_dns_packet_ipv4(s->fd_ipv4, &sa, &iface, &ttl))) {
188 dispatch_packet(s, p, (struct sockaddr*) &sa, iface, ttl);
189 flx_dns_packet_free(p);
193 if (s->pollfd_ipv6.revents & G_IO_IN) {
194 if ((p = flx_recv_dns_packet_ipv6(s->fd_ipv6, &sa6, &iface, &ttl))) {
195 dispatch_packet(s, p, (struct sockaddr*) &sa6, iface, ttl);
196 flx_dns_packet_free(p);
203 static gboolean prepare_func(GSource *source, gint *timeout) {
211 static gboolean check_func(GSource *source) {
215 s = *((flxServer**) (((guint8*) source) + sizeof(GSource)));
218 return (s->pollfd_ipv4.revents | s->pollfd_ipv6.revents) & (G_IO_IN | G_IO_HUP | G_IO_ERR);
221 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
225 s = *((flxServer**) (((guint8*) source) + sizeof(GSource)));
231 static void add_default_entries(flxServer *s) {
233 struct utsname utsname;
240 /* Fill in HINFO rr */
241 r = flx_record_new_full(s->hostname, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_HINFO);
243 r->data.hinfo.cpu = g_strdup(g_strup(utsname.machine));
244 r->data.hinfo.os = g_strdup(g_strup(utsname.sysname));
245 flx_server_add(s, 0, 0, AF_UNSPEC, TRUE, r);
248 /* Add localhost entries */
249 flx_address_parse("127.0.0.1", AF_INET, &a);
250 flx_server_add_address(s, 0, 0, AF_UNSPEC, TRUE, "localhost", &a);
252 flx_address_parse("::1", AF_INET6, &a);
253 flx_server_add_address(s, 0, 0, AF_UNSPEC, TRUE, "ip6-localhost", &a);
256 flxServer *flx_server_new(GMainContext *c) {
260 static GSourceFuncs source_funcs = {
269 s = g_new(flxServer, 1);
271 s->fd_ipv4 = flx_open_socket_ipv4();
272 s->fd_ipv6 = flx_open_socket_ipv6();
274 if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0) {
275 g_critical("Failed to create sockets.\n");
281 g_message("Failed to create IPv4 socket, proceeding in IPv6 only mode");
282 else if (s->fd_ipv6 < 0)
283 g_message("Failed to create IPv6 socket, proceeding in IPv4 only mode");
286 g_main_context_ref(s->context = c);
288 s->context = g_main_context_default();
292 FLX_LLIST_HEAD_INIT(flxServerEntry, s->entries);
293 s->rrset_by_id = g_hash_table_new(g_int_hash, g_int_equal);
294 s->rrset_by_key = g_hash_table_new((GHashFunc) flx_key_hash, (GEqualFunc) flx_key_equal);
296 FLX_LLIST_HEAD_INIT(flxSubscription, s->subscriptions);
297 s->subscription_hashtable = g_hash_table_new((GHashFunc) flx_key_hash, (GEqualFunc) flx_key_equal);
299 s->monitor = flx_interface_monitor_new(s);
300 s->time_event_queue = flx_time_event_queue_new(s->context);
303 hn = flx_get_host_name();
304 if ((e = strchr(hn, '.')))
307 s->hostname = g_strdup_printf("%s.local.", hn);
310 add_default_entries(s);
312 s->source = g_source_new(&source_funcs, sizeof(GSource) + sizeof(flxServer*));
313 *((flxServer**) (((guint8*) s->source) + sizeof(GSource))) = s;
315 memset(&s->pollfd_ipv4, 0, sizeof(s->pollfd_ipv4));
316 s->pollfd_ipv4.fd = s->fd_ipv4;
317 s->pollfd_ipv4.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
318 g_source_add_poll(s->source, &s->pollfd_ipv4);
320 memset(&s->pollfd_ipv6, 0, sizeof(s->pollfd_ipv6));
321 s->pollfd_ipv6.fd = s->fd_ipv6;
322 s->pollfd_ipv6.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
323 g_source_add_poll(s->source, &s->pollfd_ipv6);
325 g_source_attach(s->source, s->context);
330 void flx_server_free(flxServer* s) {
333 flx_interface_monitor_free(s->monitor);
335 flx_server_remove(s, 0);
337 while (s->subscriptions)
338 flx_subscription_free(s->subscriptions);
339 g_hash_table_destroy(s->subscription_hashtable);
341 g_hash_table_destroy(s->rrset_by_id);
342 g_hash_table_destroy(s->rrset_by_key);
344 flx_time_event_queue_free(s->time_event_queue);
353 g_source_destroy(s->source);
354 g_source_unref(s->source);
355 g_main_context_unref(s->context);
360 gint flx_server_get_next_id(flxServer *s) {
363 return s->current_id++;
374 flxServerEntry *e, *t;
378 g_assert(r->key->type != FLX_DNS_TYPE_ANY);
380 e = g_new(flxServerEntry, 1);
381 e->record = flx_record_ref(r);
383 e->interface = interface;
384 e->protocol = protocol;
387 FLX_LLIST_HEAD_INIT(flxAnnouncement, e->announcements);
389 FLX_LLIST_PREPEND(flxServerEntry, entry, s->entries, e);
391 /* Insert into hash table indexed by id */
392 t = g_hash_table_lookup(s->rrset_by_id, &e->id);
393 FLX_LLIST_PREPEND(flxServerEntry, by_id, t, e);
394 g_hash_table_replace(s->rrset_by_id, &e->id, t);
396 /* Insert into hash table indexed by name */
397 t = g_hash_table_lookup(s->rrset_by_key, e->record->key);
398 FLX_LLIST_PREPEND(flxServerEntry, by_key, t, e);
399 g_hash_table_replace(s->rrset_by_key, e->record->key, t);
401 flx_announce_entry(s, e);
403 const flxRecord *flx_server_iterate(flxServer *s, gint id, void **state) {
404 flxServerEntry **e = (flxServerEntry**) state;
409 *e = id > 0 ? (*e)->by_id_next : (*e)->entry_next;
411 *e = id > 0 ? g_hash_table_lookup(s->rrset_by_id, &id) : s->entries;
416 return flx_record_ref((*e)->record);
419 static void free_entry(flxServer*s, flxServerEntry *e) {
424 flx_goodbye_entry(s, e, TRUE);
426 /* Remove from linked list */
427 FLX_LLIST_REMOVE(flxServerEntry, entry, s->entries, e);
429 /* Remove from hash table indexed by id */
430 t = g_hash_table_lookup(s->rrset_by_id, &e->id);
431 FLX_LLIST_REMOVE(flxServerEntry, by_id, t, e);
433 g_hash_table_replace(s->rrset_by_id, &t->id, t);
435 g_hash_table_remove(s->rrset_by_id, &e->id);
437 /* Remove from hash table indexed by name */
438 t = g_hash_table_lookup(s->rrset_by_key, e->record->key);
439 FLX_LLIST_REMOVE(flxServerEntry, by_key, t, e);
441 g_hash_table_replace(s->rrset_by_key, t->record->key, t);
443 g_hash_table_remove(s->rrset_by_key, e->record->key);
445 flx_record_unref(e->record);
449 void flx_server_remove(flxServer *s, gint id) {
454 free_entry(s, s->entries);
458 while ((e = g_hash_table_lookup(s->rrset_by_id, &id)))
463 void flx_server_dump(flxServer *s, FILE *f) {
468 fprintf(f, "\n;;; ZONE DUMP FOLLOWS ;;;\n");
470 for (e = s->entries; e; e = e->entry_next) {
473 t = flx_record_to_string(e->record);
474 fprintf(f, "%s\n", t);
478 flx_dump_caches(s->monitor, f);
481 void flx_server_add_ptr(
494 r = flx_record_new_full(name ? name : s->hostname, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_PTR);
495 r->data.ptr.name = flx_normalize_name(dest);
496 flx_server_add(s, id, interface, protocol, unique, r);
501 void flx_server_add_address(
514 name = name ? (n = flx_normalize_name(name)) : s->hostname;
516 if (a->family == AF_INET) {
520 r = flx_record_new_full(name, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_A);
521 r->data.a.address = a->data.ipv4;
522 flx_server_add(s, id, interface, protocol, unique, r);
525 reverse = flx_reverse_lookup_name_ipv4(&a->data.ipv4);
527 flx_server_add_ptr(s, id, interface, protocol, unique, reverse, name);
534 r = flx_record_new_full(name, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_AAAA);
535 r->data.aaaa.address = a->data.ipv6;
536 flx_server_add(s, id, interface, protocol, unique, r);
539 reverse = flx_reverse_lookup_name_ipv6_arpa(&a->data.ipv6);
541 flx_server_add_ptr(s, id, interface, protocol, unique, reverse, name);
544 reverse = flx_reverse_lookup_name_ipv6_int(&a->data.ipv6);
546 flx_server_add_ptr(s, id, interface, protocol, unique, reverse, name);
553 void flx_server_add_text_va(
566 r = flx_record_new_full(name ? name : s->hostname, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_TXT);
567 r->data.txt.string_list = flx_string_list_new_va(va);
568 flx_server_add(s, id, interface, protocol, unique, r);
572 void flx_server_add_text(
586 flx_server_add_text_va(s, id, interface, protocol, unique, name, va);
590 static void escape_service_name(gchar *d, guint size, const gchar *s) {
595 while (*s && size >= 2) {
596 if (*s == '.' || *s == '\\') {
613 void flx_server_add_service_va(
625 gchar ptr_name[256], svc_name[256], ename[64], enum_ptr[256];
632 escape_service_name(ename, sizeof(ename), name);
635 while (domain[0] == '.')
643 snprintf(ptr_name, sizeof(ptr_name), "%s.%s", type, domain);
644 snprintf(svc_name, sizeof(svc_name), "%s.%s.%s", ename, type, domain);
646 flx_server_add_ptr(s, id, interface, protocol, FALSE, ptr_name, svc_name);
648 r = flx_record_new_full(svc_name, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_SRV);
649 r->data.srv.priority = 0;
650 r->data.srv.weight = 0;
651 r->data.srv.port = port;
652 r->data.srv.name = flx_normalize_name(host);
653 flx_server_add(s, id, interface, protocol, TRUE, r);
656 flx_server_add_text_va(s, id, interface, protocol, FALSE, svc_name, va);
658 snprintf(enum_ptr, sizeof(enum_ptr), "_services._dns-sd._udp.%s", domain);
659 flx_server_add_ptr(s, id, interface, protocol, FALSE, enum_ptr, ptr_name);
662 void flx_server_add_service(
681 flx_server_add_service_va(s, id, interface, protocol, type, name, domain, host, port, va);
685 static void post_query_callback(flxInterfaceMonitor *m, flxInterface *i, gpointer userdata) {
686 flxKey *k = userdata;
692 flx_interface_post_query(i, k, FALSE);
695 void flx_server_post_query(flxServer *s, gint interface, guchar protocol, flxKey *key) {
699 flx_interface_monitor_walk(s->monitor, interface, protocol, post_query_callback, key);
702 static void post_response_callback(flxInterfaceMonitor *m, flxInterface *i, gpointer userdata) {
703 flxRecord *r = userdata;
709 flx_interface_post_response(i, NULL, r, FALSE);
712 void flx_server_post_response(flxServer *s, gint interface, guchar protocol, flxRecord *record) {
716 flx_interface_monitor_walk(s->monitor, interface, protocol, post_response_callback, record);