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");
99 if (record->key->type != FLX_DNS_TYPE_ANY) {
100 g_message("Handling response: %s", txt = flx_record_to_string(record));
103 flx_cache_update(i->cache, record, cache_flush, a);
105 flx_packet_scheduler_incoming_response(i->scheduler, record);
106 flx_record_unref(record);
111 static void dispatch_packet(flxServer *s, flxDnsPacket *p, struct sockaddr *sa, gint iface, gint ttl) {
120 g_message("new packet recieved.");
122 if (!(i = flx_interface_monitor_get_interface(s->monitor, iface, sa->sa_family))) {
123 g_warning("Recieved packet from invalid interface.");
128 g_warning("Recieved packet with invalid TTL on interface '%s.%i'.", i->hardware->name, i->protocol);
132 if (sa->sa_family == AF_INET6) {
133 static const unsigned char ipv4_in_ipv6[] = {
134 0x00, 0x00, 0x00, 0x00,
135 0x00, 0x00, 0x00, 0x00,
136 0xFF, 0xFF, 0xFF, 0xFF };
138 if (memcmp(((struct sockaddr_in6*) sa)->sin6_addr.s6_addr, ipv4_in_ipv6, sizeof(ipv4_in_ipv6)) == 0) {
140 /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */
145 if (flx_dns_packet_check_valid(p) < 0) {
146 g_warning("Recieved invalid packet.");
150 flx_address_from_sockaddr(sa, &a);
152 if (flx_dns_packet_is_query(p)) {
154 if (flx_dns_packet_get_field(p, DNS_FIELD_QDCOUNT) == 0 ||
155 flx_dns_packet_get_field(p, DNS_FIELD_ARCOUNT) != 0 ||
156 flx_dns_packet_get_field(p, DNS_FIELD_NSCOUNT) != 0) {
157 g_warning("Invalid query packet.");
161 handle_query(s, p, i, &a);
162 g_message("Handled query");
164 if (flx_dns_packet_get_field(p, DNS_FIELD_QDCOUNT) != 0 ||
165 flx_dns_packet_get_field(p, DNS_FIELD_ANCOUNT) == 0 ||
166 flx_dns_packet_get_field(p, DNS_FIELD_NSCOUNT) != 0) {
167 g_warning("Invalid response packet.");
171 handle_response(s, p, i, &a);
172 g_message("Handled response");
176 static gboolean work(flxServer *s) {
177 struct sockaddr_in6 sa6;
178 struct sockaddr_in sa;
185 if (s->pollfd_ipv4.revents & G_IO_IN) {
186 if ((p = flx_recv_dns_packet_ipv4(s->fd_ipv4, &sa, &iface, &ttl))) {
187 dispatch_packet(s, p, (struct sockaddr*) &sa, iface, ttl);
188 flx_dns_packet_free(p);
192 if (s->pollfd_ipv6.revents & G_IO_IN) {
193 if ((p = flx_recv_dns_packet_ipv6(s->fd_ipv6, &sa6, &iface, &ttl))) {
194 dispatch_packet(s, p, (struct sockaddr*) &sa6, iface, ttl);
195 flx_dns_packet_free(p);
202 static gboolean prepare_func(GSource *source, gint *timeout) {
210 static gboolean check_func(GSource *source) {
214 s = *((flxServer**) (((guint8*) source) + sizeof(GSource)));
217 return (s->pollfd_ipv4.revents | s->pollfd_ipv6.revents) & (G_IO_IN | G_IO_HUP | G_IO_ERR);
220 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
224 s = *((flxServer**) (((guint8*) source) + sizeof(GSource)));
230 static void add_default_entries(flxServer *s) {
232 struct utsname utsname;
238 /* Fill in HINFO rr */
240 hinfo = g_strdup_printf("%c%s%c%s%n",
241 strlen(utsname.machine), g_strup(utsname.machine),
242 strlen(utsname.sysname), g_strup(utsname.sysname),
245 flx_server_add_full(s, 0, 0, AF_UNSPEC, TRUE,
246 s->hostname, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_HINFO, hinfo, length, FLX_DEFAULT_TTL);
250 /* Add localhost entries */
251 flx_address_parse("127.0.0.1", AF_INET, &a);
252 flx_server_add_address(s, 0, 0, AF_UNSPEC, TRUE, "localhost", &a);
254 flx_address_parse("::1", AF_INET6, &a);
255 flx_server_add_address(s, 0, 0, AF_UNSPEC, TRUE, "ip6-localhost", &a);
258 flxServer *flx_server_new(GMainContext *c) {
262 static GSourceFuncs source_funcs = {
271 s = g_new(flxServer, 1);
273 s->fd_ipv4 = flx_open_socket_ipv4();
274 s->fd_ipv6 = flx_open_socket_ipv6();
276 if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0) {
277 g_critical("Failed to create sockets.\n");
283 g_message("Failed to create IPv4 socket, proceeding in IPv6 only mode");
284 else if (s->fd_ipv6 < 0)
285 g_message("Failed to create IPv6 socket, proceeding in IPv4 only mode");
288 g_main_context_ref(s->context = c);
290 s->context = g_main_context_default();
294 FLX_LLIST_HEAD_INIT(flxServerEntry, s->entries);
295 s->rrset_by_id = g_hash_table_new(g_int_hash, g_int_equal);
296 s->rrset_by_key = g_hash_table_new((GHashFunc) flx_key_hash, (GEqualFunc) flx_key_equal);
298 FLX_LLIST_HEAD_INIT(flxSubscription, s->subscriptions);
299 s->subscription_hashtable = g_hash_table_new((GHashFunc) flx_key_hash, (GEqualFunc) flx_key_equal);
301 s->monitor = flx_interface_monitor_new(s);
302 s->time_event_queue = flx_time_event_queue_new(s->context);
305 hn = flx_get_host_name();
306 if ((e = strchr(hn, '.')))
309 s->hostname = g_strdup_printf("%s.local.", hn);
312 add_default_entries(s);
314 s->source = g_source_new(&source_funcs, sizeof(GSource) + sizeof(flxServer*));
315 *((flxServer**) (((guint8*) s->source) + sizeof(GSource))) = s;
317 memset(&s->pollfd_ipv4, 0, sizeof(s->pollfd_ipv4));
318 s->pollfd_ipv4.fd = s->fd_ipv4;
319 s->pollfd_ipv4.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
320 g_source_add_poll(s->source, &s->pollfd_ipv4);
322 memset(&s->pollfd_ipv6, 0, sizeof(s->pollfd_ipv6));
323 s->pollfd_ipv6.fd = s->fd_ipv6;
324 s->pollfd_ipv6.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
325 g_source_add_poll(s->source, &s->pollfd_ipv6);
327 g_source_attach(s->source, s->context);
332 void flx_server_free(flxServer* s) {
335 flx_interface_monitor_free(s->monitor);
337 flx_server_remove(s, 0);
339 while (s->subscriptions)
340 flx_subscription_free(s->subscriptions);
341 g_hash_table_destroy(s->subscription_hashtable);
343 g_hash_table_destroy(s->rrset_by_id);
344 g_hash_table_destroy(s->rrset_by_key);
346 flx_time_event_queue_free(s->time_event_queue);
355 g_source_destroy(s->source);
356 g_source_unref(s->source);
357 g_main_context_unref(s->context);
362 gint flx_server_get_next_id(flxServer *s) {
365 return s->current_id++;
376 flxServerEntry *e, *t;
380 g_assert(r->key->type != FLX_DNS_TYPE_ANY);
382 e = g_new(flxServerEntry, 1);
383 e->record = flx_record_ref(r);
385 e->interface = interface;
386 e->protocol = protocol;
389 FLX_LLIST_HEAD_INIT(flxAnnouncement, e->announcements);
391 FLX_LLIST_PREPEND(flxServerEntry, entry, s->entries, e);
393 /* Insert into hash table indexed by id */
394 t = g_hash_table_lookup(s->rrset_by_id, &e->id);
395 FLX_LLIST_PREPEND(flxServerEntry, by_id, t, e);
396 g_hash_table_replace(s->rrset_by_id, &e->id, t);
398 /* Insert into hash table indexed by name */
399 t = g_hash_table_lookup(s->rrset_by_key, e->record->key);
400 FLX_LLIST_PREPEND(flxServerEntry, by_key, t, e);
401 g_hash_table_replace(s->rrset_by_key, e->record->key, t);
403 flx_announce_entry(s, e);
406 void flx_server_add_full(
424 r = flx_record_new_full(name ? name : s->hostname, class, type, data, size, ttl);
425 flx_server_add(s, id, interface, protocol, unique, r);
429 const flxRecord *flx_server_iterate(flxServer *s, gint id, void **state) {
430 flxServerEntry **e = (flxServerEntry**) state;
435 *e = id > 0 ? (*e)->by_id_next : (*e)->entry_next;
437 *e = id > 0 ? g_hash_table_lookup(s->rrset_by_id, &id) : s->entries;
442 return flx_record_ref((*e)->record);
445 static void free_entry(flxServer*s, flxServerEntry *e) {
450 flx_goodbye_entry(s, e, TRUE);
452 /* Remove from linked list */
453 FLX_LLIST_REMOVE(flxServerEntry, entry, s->entries, e);
455 /* Remove from hash table indexed by id */
456 t = g_hash_table_lookup(s->rrset_by_id, &e->id);
457 FLX_LLIST_REMOVE(flxServerEntry, by_id, t, e);
459 g_hash_table_replace(s->rrset_by_id, &t->id, t);
461 g_hash_table_remove(s->rrset_by_id, &e->id);
463 /* Remove from hash table indexed by name */
464 t = g_hash_table_lookup(s->rrset_by_key, e->record->key);
465 FLX_LLIST_REMOVE(flxServerEntry, by_key, t, e);
467 g_hash_table_replace(s->rrset_by_key, t->record->key, t);
469 g_hash_table_remove(s->rrset_by_key, e->record->key);
471 flx_record_unref(e->record);
475 void flx_server_remove(flxServer *s, gint id) {
480 free_entry(s, s->entries);
484 while ((e = g_hash_table_lookup(s->rrset_by_id, &id)))
489 void flx_server_dump(flxServer *s, FILE *f) {
494 fprintf(f, "\n;;; ZONE DUMP FOLLOWS ;;;\n");
496 for (e = s->entries; e; e = e->entry_next) {
499 t = flx_record_to_string(e->record);
500 fprintf(f, "%s\n", t);
504 flx_dump_caches(s->monitor, f);
507 void flx_server_add_address(
520 n = name ? flx_normalize_name(name) : s->hostname;
522 if (a->family == AF_INET) {
525 flx_server_add_full(s, id, interface, protocol, unique, n, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_A, &a->data.ipv4, sizeof(a->data.ipv4), FLX_DEFAULT_TTL);
527 r = flx_reverse_lookup_name_ipv4(&a->data.ipv4);
529 flx_server_add_full(s, id, interface, protocol, unique, r, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_PTR, n, strlen(n)+1, FLX_DEFAULT_TTL);
535 flx_server_add_full(s, id, interface, protocol, unique, n, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_AAAA, &a->data.ipv6, sizeof(a->data.ipv6), FLX_DEFAULT_TTL);
537 r = flx_reverse_lookup_name_ipv6_arpa(&a->data.ipv6);
539 flx_server_add_full(s, id, interface, protocol, unique, r, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_PTR, n, strlen(n)+1, FLX_DEFAULT_TTL);
542 r = flx_reverse_lookup_name_ipv6_int(&a->data.ipv6);
544 flx_server_add_full(s, id, interface, protocol, unique, r, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_PTR, n, strlen(n)+1, FLX_DEFAULT_TTL);
551 void flx_server_add_text(
566 if ((l = strlen(text)) > 255)
571 memcpy(buf+1, text, l);
573 flx_server_add_full(s, id, interface, protocol, unique, name, FLX_DNS_CLASS_IN, FLX_DNS_TYPE_TXT, buf, l+1, FLX_DEFAULT_TTL);
576 static void post_query_callback(flxInterfaceMonitor *m, flxInterface *i, gpointer userdata) {
577 flxKey *k = userdata;
583 flx_interface_post_query(i, k, FALSE);
586 void flx_server_post_query(flxServer *s, gint interface, guchar protocol, flxKey *key) {
590 flx_interface_monitor_walk(s->monitor, interface, protocol, post_query_callback, key);
593 static void post_response_callback(flxInterfaceMonitor *m, flxInterface *i, gpointer userdata) {
594 flxRecord *r = userdata;
600 flx_interface_post_response(i, NULL, r, FALSE);
603 void flx_server_post_response(flxServer *s, gint interface, guchar protocol, flxRecord *record) {
607 flx_interface_monitor_walk(s->monitor, interface, protocol, post_response_callback, record);