--- /dev/null
+/***
+ This file is part of avahi.
+
+ avahi is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ avahi is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
+ Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with avahi; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+ USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <netinet/in.h>
+
+#include <avahi/malloc.h>
+#include <avahi/error.h>
+#include <avahi/timeval.h>
+
+#include "internal.h"
+#include "browse.h"
+#include "socket.h"
+#include <avahi/log.h>
+#include "hashmap.h"
+#include "wide-area.h"
+#include "addr-util.h"
+#include "rr-util.h"
+
+#define CACHE_ENTRIES_MAX 500
+
+typedef struct AvahiWideAreaCacheEntry AvahiWideAreaCacheEntry;
+
+struct AvahiWideAreaCacheEntry {
+ AvahiWideAreaLookupEngine *engine;
+
+ AvahiRecord *record;
+ struct timeval timestamp;
+ struct timeval expiry;
+
+ AvahiTimeEvent *time_event;
+
+ AVAHI_LLIST_FIELDS(AvahiWideAreaCacheEntry, by_key);
+ AVAHI_LLIST_FIELDS(AvahiWideAreaCacheEntry, cache);
+};
+
+struct AvahiWideAreaLookup {
+ AvahiWideAreaLookupEngine *engine;
+ int dead;
+
+ uint32_t id; /* effectively just an uint16_t, but we need it as an index for a hash table */
+ AvahiTimeEvent *time_event;
+
+ AvahiKey *key, *cname_key;
+
+ int n_send;
+ AvahiDnsPacket *packet;
+
+ AvahiWideAreaLookupCallback callback;
+ void *userdata;
+
+ AvahiAddress dns_server_used;
+
+ AVAHI_LLIST_FIELDS(AvahiWideAreaLookup, lookups);
+ AVAHI_LLIST_FIELDS(AvahiWideAreaLookup, by_key);
+};
+
+struct AvahiWideAreaLookupEngine {
+ AvahiServer *server;
+
+ int fd_ipv4, fd_ipv6;
+ AvahiWatch *watch_ipv4, *watch_ipv6;
+
+ uint16_t next_id;
+
+ /* Cache */
+ AVAHI_LLIST_HEAD(AvahiWideAreaCacheEntry, cache);
+ AvahiHashmap *cache_by_key;
+ unsigned cache_n_entries;
+
+ /* Lookups */
+ AVAHI_LLIST_HEAD(AvahiWideAreaLookup, lookups);
+ AvahiHashmap *lookups_by_id;
+ AvahiHashmap *lookups_by_key;
+
+ int cleanup_dead;
+
+ AvahiAddress dns_servers[AVAHI_WIDE_AREA_SERVERS_MAX];
+ unsigned n_dns_servers;
+ unsigned current_dns_server;
+};
+
+static AvahiWideAreaLookup* find_lookup(AvahiWideAreaLookupEngine *e, uint16_t id) {
+ AvahiWideAreaLookup *l;
+ int i = (int) id;
+
+ assert(e);
+
+ if (!(l = avahi_hashmap_lookup(e->lookups_by_id, &i)))
+ return NULL;
+
+ assert(l->id == id);
+
+ if (l->dead)
+ return NULL;
+
+ return l;
+}
+
+static int send_to_dns_server(AvahiWideAreaLookup *l, AvahiDnsPacket *p) {
+ AvahiAddress *a;
+
+ assert(l);
+ assert(p);
+
+ if (l->engine->n_dns_servers <= 0)
+ return -1;
+
+ assert(l->engine->current_dns_server < l->engine->n_dns_servers);
+
+ a = &l->engine->dns_servers[l->engine->current_dns_server];
+ l->dns_server_used = *a;
+
+ if (a->proto == AVAHI_PROTO_INET) {
+
+ if (l->engine->fd_ipv4 < 0)
+ return -1;
+
+ return avahi_send_dns_packet_ipv4(l->engine->fd_ipv4, AVAHI_IF_UNSPEC, p, NULL, &a->data.ipv4, AVAHI_DNS_PORT);
+
+ } else {
+ assert(a->proto == AVAHI_PROTO_INET6);
+
+ if (l->engine->fd_ipv6 < 0)
+ return -1;
+
+ return avahi_send_dns_packet_ipv6(l->engine->fd_ipv6, AVAHI_IF_UNSPEC, p, NULL, &a->data.ipv6, AVAHI_DNS_PORT);
+ }
+}
+
+static void next_dns_server(AvahiWideAreaLookupEngine *e) {
+ assert(e);
+
+ e->current_dns_server++;
+
+ if (e->current_dns_server >= e->n_dns_servers)
+ e->current_dns_server = 0;
+}
+
+static void lookup_stop(AvahiWideAreaLookup *l) {
+ assert(l);
+
+ l->callback = NULL;
+
+ if (l->time_event) {
+ avahi_time_event_free(l->time_event);
+ l->time_event = NULL;
+ }
+}
+
+static void sender_timeout_callback(AvahiTimeEvent *e, void *userdata) {
+ AvahiWideAreaLookup *l = userdata;
+ struct timeval tv;
+
+ assert(l);
+
+ /* Try another DNS server after three retries */
+ if (l->n_send >= 3 && avahi_address_cmp(&l->engine->dns_servers[l->engine->current_dns_server], &l->dns_server_used) == 0) {
+ next_dns_server(l->engine);
+
+ if (avahi_address_cmp(&l->engine->dns_servers[l->engine->current_dns_server], &l->dns_server_used) == 0)
+ /* There is no other DNS server, fail */
+ l->n_send = 1000;
+ }
+
+ if (l->n_send >= 6) {
+ avahi_log_warn(__FILE__": Query timed out.");
+ avahi_server_set_errno(l->engine->server, AVAHI_ERR_TIMEOUT);
+ l->callback(l->engine, AVAHI_BROWSER_FAILURE, AVAHI_LOOKUP_RESULT_WIDE_AREA, NULL, l->userdata);
+ lookup_stop(l);
+ return;
+ }
+
+ assert(l->packet);
+ send_to_dns_server(l, l->packet);
+ l->n_send++;
+
+ avahi_time_event_update(e, avahi_elapse_time(&tv, 1000, 0));
+}
+
+AvahiWideAreaLookup *avahi_wide_area_lookup_new(
+ AvahiWideAreaLookupEngine *e,
+ AvahiKey *key,
+ AvahiWideAreaLookupCallback callback,
+ void *userdata) {
+
+ struct timeval tv;
+ AvahiWideAreaLookup *l, *t;
+ uint8_t *p;
+
+ assert(e);
+ assert(key);
+ assert(callback);
+ assert(userdata);
+
+ l = avahi_new(AvahiWideAreaLookup, 1);
+ l->engine = e;
+ l->dead = 0;
+ l->key = avahi_key_ref(key);
+ l->cname_key = avahi_key_new_cname(l->key);
+ l->callback = callback;
+ l->userdata = userdata;
+
+ /* If more than 65K wide area quries are issued simultaneously,
+ * this will break. This should be limited by some higher level */
+
+ for (;; e->next_id++)
+ if (!find_lookup(e, e->next_id))
+ break; /* This ID is not yet used. */
+
+ l->id = e->next_id++;
+
+ /* We keep the packet around in case we need to repeat our query */
+ l->packet = avahi_dns_packet_new(0);
+
+ avahi_dns_packet_set_field(l->packet, AVAHI_DNS_FIELD_ID, (uint16_t) l->id);
+ avahi_dns_packet_set_field(l->packet, AVAHI_DNS_FIELD_FLAGS, AVAHI_DNS_FLAGS(0, 0, 0, 0, 1, 0, 0, 0, 0, 0));
+
+ p = avahi_dns_packet_append_key(l->packet, key, 0);
+ assert(p);
+
+ avahi_dns_packet_set_field(l->packet, AVAHI_DNS_FIELD_QDCOUNT, 1);
+
+ if (send_to_dns_server(l, l->packet) < 0) {
+ avahi_log_error(__FILE__": Failed to send packet.");
+ avahi_dns_packet_free(l->packet);
+ avahi_key_unref(l->key);
+ if (l->cname_key)
+ avahi_key_unref(l->cname_key);
+ avahi_free(l);
+ return NULL;
+ }
+
+ l->n_send = 1;
+
+ l->time_event = avahi_time_event_new(e->server->time_event_queue, avahi_elapse_time(&tv, 500, 0), sender_timeout_callback, l);
+
+ avahi_hashmap_insert(e->lookups_by_id, &l->id, l);
+
+ t = avahi_hashmap_lookup(e->lookups_by_key, l->key);
+ AVAHI_LLIST_PREPEND(AvahiWideAreaLookup, by_key, t, l);
+ avahi_hashmap_replace(e->lookups_by_key, avahi_key_ref(l->key), t);
+
+ AVAHI_LLIST_PREPEND(AvahiWideAreaLookup, lookups, e->lookups, l);
+
+ return l;
+}
+
+static void lookup_destroy(AvahiWideAreaLookup *l) {
+ AvahiWideAreaLookup *t;
+ assert(l);
+
+ lookup_stop(l);
+
+ t = avahi_hashmap_lookup(l->engine->lookups_by_key, l->key);
+ AVAHI_LLIST_REMOVE(AvahiWideAreaLookup, by_key, t, l);
+ if (t)
+ avahi_hashmap_replace(l->engine->lookups_by_key, avahi_key_ref(l->key), t);
+ else
+ avahi_hashmap_remove(l->engine->lookups_by_key, l->key);
+
+ AVAHI_LLIST_REMOVE(AvahiWideAreaLookup, lookups, l->engine->lookups, l);
+
+ avahi_hashmap_remove(l->engine->lookups_by_id, &l->id);
+ avahi_dns_packet_free(l->packet);
+
+ if (l->key)
+ avahi_key_unref(l->key);
+
+ if (l->cname_key)
+ avahi_key_unref(l->cname_key);
+
+ avahi_free(l);
+}
+
+void avahi_wide_area_lookup_free(AvahiWideAreaLookup *l) {
+ assert(l);
+
+ if (l->dead)
+ return;
+
+ l->dead = 1;
+ l->engine->cleanup_dead = 1;
+ lookup_stop(l);
+}
+
+void avahi_wide_area_cleanup(AvahiWideAreaLookupEngine *e) {
+ AvahiWideAreaLookup *l, *n;
+ assert(e);
+
+ while (e->cleanup_dead) {
+ e->cleanup_dead = 0;
+
+ for (l = e->lookups; l; l = n) {
+ n = l->lookups_next;
+
+ if (l->dead)
+ lookup_destroy(l);
+ }
+ }
+}
+
+static void cache_entry_free(AvahiWideAreaCacheEntry *c) {
+ AvahiWideAreaCacheEntry *t;
+ assert(c);
+
+ if (c->time_event)
+ avahi_time_event_free(c->time_event);
+
+ AVAHI_LLIST_REMOVE(AvahiWideAreaCacheEntry, cache, c->engine->cache, c);
+
+ t = avahi_hashmap_lookup(c->engine->cache_by_key, c->record->key);
+ AVAHI_LLIST_REMOVE(AvahiWideAreaCacheEntry, by_key, t, c);
+ if (t)
+ avahi_hashmap_replace(c->engine->cache_by_key, avahi_key_ref(c->record->key), t);
+ else
+ avahi_hashmap_remove(c->engine->cache_by_key, c->record->key);
+
+ c->engine->cache_n_entries --;
+
+ avahi_record_unref(c->record);
+ avahi_free(c);
+}
+
+static void expiry_event(AvahiTimeEvent *te, void *userdata) {
+ AvahiWideAreaCacheEntry *e = userdata;
+
+ assert(te);
+ assert(e);
+
+ cache_entry_free(e);
+}
+
+static AvahiWideAreaCacheEntry* find_record_in_cache(AvahiWideAreaLookupEngine *e, AvahiRecord *r) {
+ AvahiWideAreaCacheEntry *c;
+
+ assert(e);
+ assert(r);
+
+ for (c = avahi_hashmap_lookup(e->cache_by_key, r->key); c; c = c->by_key_next)
+ if (avahi_record_equal_no_ttl(r, c->record))
+ return c;
+
+ return NULL;
+}
+
+static void run_callbacks(AvahiWideAreaLookupEngine *e, AvahiRecord *r) {
+ AvahiWideAreaLookup *l;
+
+ assert(e);
+ assert(r);
+
+ for (l = avahi_hashmap_lookup(e->lookups_by_key, r->key); l; l = l->by_key_next) {
+ if (l->dead || !l->callback)
+ continue;
+
+ l->callback(e, AVAHI_BROWSER_NEW, AVAHI_LOOKUP_RESULT_WIDE_AREA, r, l->userdata);
+ }
+
+ if (r->key->clazz == AVAHI_DNS_CLASS_IN && r->key->type == AVAHI_DNS_TYPE_CNAME) {
+ /* It's a CNAME record, so we have to scan the all lookups to see if one matches */
+
+ for (l = e->lookups; l; l = l->lookups_next) {
+ AvahiKey *key;
+
+ if (l->dead || !l->callback)
+ continue;
+
+ if ((key = avahi_key_new_cname(l->key))) {
+ if (avahi_key_equal(r->key, key))
+ l->callback(e, AVAHI_BROWSER_NEW, AVAHI_LOOKUP_RESULT_WIDE_AREA, r, l->userdata);
+
+ avahi_key_unref(key);
+ }
+ }
+ }
+}
+
+static void add_to_cache(AvahiWideAreaLookupEngine *e, AvahiRecord *r) {
+ AvahiWideAreaCacheEntry *c;
+ int is_new;
+
+ assert(e);
+ assert(r);
+
+ if ((c = find_record_in_cache(e, r))) {
+ is_new = 0;
+
+ /* Update the existing entry */
+ avahi_record_unref(c->record);
+ } else {
+ AvahiWideAreaCacheEntry *t;
+
+ is_new = 1;
+
+ /* Enforce cache size */
+ if (e->cache_n_entries >= CACHE_ENTRIES_MAX)
+ /* Eventually we should improve the caching algorithm here */
+ goto finish;
+
+ c = avahi_new(AvahiWideAreaCacheEntry, 1);
+ c->engine = e;
+ c->time_event = NULL;
+
+ AVAHI_LLIST_PREPEND(AvahiWideAreaCacheEntry, cache, e->cache, c);
+
+ /* Add the new entry to the cache entry hash table */
+ t = avahi_hashmap_lookup(e->cache_by_key, r->key);
+ AVAHI_LLIST_PREPEND(AvahiWideAreaCacheEntry, by_key, t, c);
+ avahi_hashmap_replace(e->cache_by_key, avahi_key_ref(r->key), t);
+
+ e->cache_n_entries ++;
+ }
+
+ c->record = avahi_record_ref(r);
+
+ gettimeofday(&c->timestamp, NULL);
+ c->expiry = c->timestamp;
+ avahi_timeval_add(&c->expiry, r->ttl * 1000000);
+
+ if (c->time_event)
+ avahi_time_event_update(c->time_event, &c->expiry);
+ else
+ c->time_event = avahi_time_event_new(e->server->time_event_queue, &c->expiry, expiry_event, c);
+
+finish:
+
+ if (is_new)
+ run_callbacks(e, r);
+}
+
+static int map_dns_error(uint16_t error) {
+ static const int table[16] = {
+ AVAHI_OK,
+ AVAHI_ERR_DNS_FORMERR,
+ AVAHI_ERR_DNS_SERVFAIL,
+ AVAHI_ERR_DNS_NXDOMAIN,
+ AVAHI_ERR_DNS_NOTIMP,
+ AVAHI_ERR_DNS_REFUSED,
+ AVAHI_ERR_DNS_YXDOMAIN,
+ AVAHI_ERR_DNS_YXRRSET,
+ AVAHI_ERR_DNS_NXRRSET,
+ AVAHI_ERR_DNS_NOTAUTH,
+ AVAHI_ERR_DNS_NOTZONE,
+ AVAHI_ERR_INVALID_DNS_ERROR,
+ AVAHI_ERR_INVALID_DNS_ERROR,
+ AVAHI_ERR_INVALID_DNS_ERROR,
+ AVAHI_ERR_INVALID_DNS_ERROR,
+ AVAHI_ERR_INVALID_DNS_ERROR
+ };
+
+ assert(error <= 15);
+
+ return table[error];
+}
+
+static void handle_packet(AvahiWideAreaLookupEngine *e, AvahiDnsPacket *p) {
+ AvahiWideAreaLookup *l = NULL;
+ int i, r;
+
+ AvahiBrowserEvent final_event = AVAHI_BROWSER_ALL_FOR_NOW;
+
+ assert(e);
+ assert(p);
+
+ /* Some superficial validity tests */
+ if (avahi_dns_packet_check_valid(p) < 0 || avahi_dns_packet_is_query(p)) {
+ avahi_log_warn(__FILE__": Ignoring invalid response for wide area datagram.");
+ goto finish;
+ }
+
+ /* Look for the lookup that issued this query */
+ if (!(l = find_lookup(e, avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID))) || l->dead)
+ goto finish;
+
+ /* Check whether this a packet indicating a failure */
+ if ((r = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & 15) != 0 ||
+ avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0) {
+
+ avahi_server_set_errno(e->server, r == 0 ? AVAHI_ERR_NOT_FOUND : map_dns_error(r));
+ /* Tell the user about the failure */
+ final_event = AVAHI_BROWSER_FAILURE;
+
+ /* We go on here, since some of the records contained in the
+ reply might be interesting in some way */
+ }
+
+ /* Skip over the question */
+ for (i = (int) avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); i > 0; i--) {
+ AvahiKey *k;
+
+ if (!(k = avahi_dns_packet_consume_key(p, NULL))) {
+ avahi_log_warn(__FILE__": Wide area response packet too short or invalid while reading question key. (Maybe a UTF-8 problem?)");
+ avahi_server_set_errno(e->server, AVAHI_ERR_INVALID_PACKET);
+ final_event = AVAHI_BROWSER_FAILURE;
+ goto finish;
+ }
+
+ avahi_key_unref(k);
+ }
+
+ /* Process responses */
+ for (i = (int) avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) +
+ (int) avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) +
+ (int) avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT); i > 0; i--) {
+
+ AvahiRecord *rr;
+
+ if (!(rr = avahi_dns_packet_consume_record(p, NULL))) {
+ avahi_log_warn(__FILE__": Wide area response packet too short or invalid while reading response record. (Maybe a UTF-8 problem?)");
+ avahi_server_set_errno(e->server, AVAHI_ERR_INVALID_PACKET);
+ final_event = AVAHI_BROWSER_FAILURE;
+ goto finish;
+ }
+
+ add_to_cache(e, rr);
+ avahi_record_unref(rr);
+ }
+
+finish:
+
+ if (l && !l->dead) {
+ if (l->callback)
+ l->callback(e, final_event, AVAHI_LOOKUP_RESULT_WIDE_AREA, NULL, l->userdata);
+
+ lookup_stop(l);
+ }
+}
+
+static void socket_event(AVAHI_GCC_UNUSED AvahiWatch *w, int fd, AVAHI_GCC_UNUSED AvahiWatchEvent events, void *userdata) {
+ AvahiWideAreaLookupEngine *e = userdata;
+ AvahiDnsPacket *p = NULL;
+
+ if (fd == e->fd_ipv4)
+ p = avahi_recv_dns_packet_ipv4(e->fd_ipv4, NULL, NULL, NULL, NULL, NULL);
+ else {
+ assert(fd == e->fd_ipv6);
+ p = avahi_recv_dns_packet_ipv6(e->fd_ipv6, NULL, NULL, NULL, NULL, NULL);
+ }
+
+ if (p) {
+ handle_packet(e, p);
+ avahi_dns_packet_free(p);
+ }
+}
+
+AvahiWideAreaLookupEngine *avahi_wide_area_engine_new(AvahiServer *s) {
+ AvahiWideAreaLookupEngine *e;
+
+ assert(s);
+
+ e = avahi_new(AvahiWideAreaLookupEngine, 1);
+ e->server = s;
+ e->cleanup_dead = 0;
+
+ /* Create sockets */
+ e->fd_ipv4 = s->config.use_ipv4 ? avahi_open_unicast_socket_ipv4() : -1;
+ e->fd_ipv6 = s->config.use_ipv6 ? avahi_open_unicast_socket_ipv6() : -1;
+
+ if (e->fd_ipv4 < 0 && e->fd_ipv6 < 0) {
+ avahi_log_error(__FILE__": Failed to create wide area sockets: %s", strerror(errno));
+
+ if (e->fd_ipv6 >= 0)
+ close(e->fd_ipv6);
+
+ if (e->fd_ipv4 >= 0)
+ close(e->fd_ipv4);
+
+ avahi_free(e);
+ return NULL;
+ }
+
+ /* Create watches */
+
+ e->watch_ipv4 = e->watch_ipv6 = NULL;
+
+ if (e->fd_ipv4 >= 0)
+ e->watch_ipv4 = s->poll_api->watch_new(e->server->poll_api, e->fd_ipv4, AVAHI_WATCH_IN, socket_event, e);
+ if (e->fd_ipv6 >= 0)
+ e->watch_ipv6 = s->poll_api->watch_new(e->server->poll_api, e->fd_ipv6, AVAHI_WATCH_IN, socket_event, e);
+
+ e->n_dns_servers = e->current_dns_server = 0;
+ e->next_id = (uint16_t) rand();
+
+ /* Initialize cache */
+ AVAHI_LLIST_HEAD_INIT(AvahiWideAreaCacheEntry, e->cache);
+ e->cache_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, (AvahiFreeFunc) avahi_key_unref, NULL);
+ e->cache_n_entries = 0;
+
+ /* Initialize lookup list */
+ e->lookups_by_id = avahi_hashmap_new((AvahiHashFunc) avahi_int_hash, (AvahiEqualFunc) avahi_int_equal, NULL, NULL);
+ e->lookups_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, (AvahiFreeFunc) avahi_key_unref, NULL);
+ AVAHI_LLIST_HEAD_INIT(AvahiWideAreaLookup, e->lookups);
+
+ return e;
+}
+
+void avahi_wide_area_engine_free(AvahiWideAreaLookupEngine *e) {
+ assert(e);
+
+ avahi_wide_area_clear_cache(e);
+
+ while (e->lookups)
+ lookup_destroy(e->lookups);
+
+ avahi_hashmap_free(e->cache_by_key);
+ avahi_hashmap_free(e->lookups_by_id);
+ avahi_hashmap_free(e->lookups_by_key);
+
+ if (e->watch_ipv4)
+ e->server->poll_api->watch_free(e->watch_ipv4);
+
+ if (e->watch_ipv6)
+ e->server->poll_api->watch_free(e->watch_ipv6);
+
+ if (e->fd_ipv6 >= 0)
+ close(e->fd_ipv6);
+
+ if (e->fd_ipv4 >= 0)
+ close(e->fd_ipv4);
+
+ avahi_free(e);
+}
+
+void avahi_wide_area_clear_cache(AvahiWideAreaLookupEngine *e) {
+ assert(e);
+
+ while (e->cache)
+ cache_entry_free(e->cache);
+
+ assert(e->cache_n_entries == 0);
+}
+
+void avahi_wide_area_set_servers(AvahiWideAreaLookupEngine *e, const AvahiAddress *a, unsigned n) {
+ assert(e);
+
+ if (a) {
+ for (e->n_dns_servers = 0; n > 0 && e->n_dns_servers < AVAHI_WIDE_AREA_SERVERS_MAX; a++, n--)
+ if ((a->proto == AVAHI_PROTO_INET && e->fd_ipv4 >= 0) || (a->proto == AVAHI_PROTO_INET6 && e->fd_ipv6 >= 0))
+ e->dns_servers[e->n_dns_servers++] = *a;
+ } else {
+ assert(n == 0);
+ e->n_dns_servers = 0;
+ }
+
+ e->current_dns_server = 0;
+
+ avahi_wide_area_clear_cache(e);
+}
+
+void avahi_wide_area_cache_dump(AvahiWideAreaLookupEngine *e, AvahiDumpCallback callback, void* userdata) {
+ AvahiWideAreaCacheEntry *c;
+
+ assert(e);
+ assert(callback);
+
+ callback(";; WIDE AREA CACHE ;;; ", userdata);
+
+ for (c = e->cache; c; c = c->cache_next) {
+ char *t = avahi_record_to_string(c->record);
+ callback(t, userdata);
+ avahi_free(t);
+ }
+}
+
+unsigned avahi_wide_area_scan_cache(AvahiWideAreaLookupEngine *e, AvahiKey *key, AvahiWideAreaLookupCallback callback, void *userdata) {
+ AvahiWideAreaCacheEntry *c;
+ AvahiKey *cname_key;
+ unsigned n = 0;
+
+ assert(e);
+ assert(key);
+ assert(callback);
+
+ for (c = avahi_hashmap_lookup(e->cache_by_key, key); c; c = c->by_key_next) {
+ callback(e, AVAHI_BROWSER_NEW, AVAHI_LOOKUP_RESULT_WIDE_AREA|AVAHI_LOOKUP_RESULT_CACHED, c->record, userdata);
+ n++;
+ }
+
+ if ((cname_key = avahi_key_new_cname(key))) {
+
+ for (c = avahi_hashmap_lookup(e->cache_by_key, cname_key); c; c = c->by_key_next) {
+ callback(e, AVAHI_BROWSER_NEW, AVAHI_LOOKUP_RESULT_WIDE_AREA|AVAHI_LOOKUP_RESULT_CACHED, c->record, userdata);
+ n++;
+ }
+
+ avahi_key_unref(cname_key);
+ }
+
+ return n;
+}
+
+int avahi_wide_area_has_servers(AvahiWideAreaLookupEngine *e) {
+ assert(e);
+
+ return e->n_dns_servers > 0;
+}
+
+
+
projects / catta / blobdiff