diff options
Diffstat (limited to 'release-0.6.9/avahi-core/resolve-host-name.c')
| -rw-r--r-- | release-0.6.9/avahi-core/resolve-host-name.c | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/release-0.6.9/avahi-core/resolve-host-name.c b/release-0.6.9/avahi-core/resolve-host-name.c new file mode 100644 index 0000000..59dc3cf --- /dev/null +++ b/release-0.6.9/avahi-core/resolve-host-name.c @@ -0,0 +1,299 @@ +/* $Id$ */ + +/*** + 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 <stdlib.h> + +#include <avahi-common/domain.h> +#include <avahi-common/timeval.h> +#include <avahi-common/malloc.h> +#include <avahi-common/error.h> + +#include "browse.h" +#include "log.h" + +#define TIMEOUT_MSEC 5000 + +struct AvahiSHostNameResolver { + AvahiServer *server; + char *host_name; + + AvahiSRecordBrowser *record_browser_a; + AvahiSRecordBrowser *record_browser_aaaa; + + AvahiSHostNameResolverCallback callback; + void* userdata; + + AvahiRecord *address_record; + AvahiIfIndex interface; + AvahiProtocol protocol; + AvahiLookupResultFlags flags; + + AvahiTimeEvent *time_event; + + AVAHI_LLIST_FIELDS(AvahiSHostNameResolver, resolver); +}; + +static void finish(AvahiSHostNameResolver *r, AvahiResolverEvent event) { + assert(r); + + if (r->time_event) { + avahi_time_event_free(r->time_event); + r->time_event = NULL; + } + + switch (event) { + case AVAHI_RESOLVER_FOUND: { + AvahiAddress a; + + assert(r->address_record); + + switch (r->address_record->key->type) { + case AVAHI_DNS_TYPE_A: + a.proto = AVAHI_PROTO_INET; + a.data.ipv4 = r->address_record->data.a.address; + break; + + case AVAHI_DNS_TYPE_AAAA: + a.proto = AVAHI_PROTO_INET6; + a.data.ipv6 = r->address_record->data.aaaa.address; + break; + + default: + abort(); + } + + r->callback(r, r->interface, r->protocol, AVAHI_RESOLVER_FOUND, r->address_record->key->name, &a, r->flags, r->userdata); + break; + + } + + case AVAHI_RESOLVER_FAILURE: + + r->callback(r, r->interface, r->protocol, event, r->host_name, NULL, r->flags, r->userdata); + break; + } +} + +static void time_event_callback(AvahiTimeEvent *e, void *userdata) { + AvahiSHostNameResolver *r = userdata; + + assert(e); + assert(r); + + avahi_server_set_errno(r->server, AVAHI_ERR_TIMEOUT); + finish(r, AVAHI_RESOLVER_FAILURE); +} + +static void start_timeout(AvahiSHostNameResolver *r) { + struct timeval tv; + assert(r); + + if (r->time_event) + return; + + avahi_elapse_time(&tv, TIMEOUT_MSEC, 0); + + r->time_event = avahi_time_event_new(r->server->time_event_queue, &tv, time_event_callback, r); +} + +static void record_browser_callback( + AvahiSRecordBrowser*rr, + AvahiIfIndex interface, + AvahiProtocol protocol, + AvahiBrowserEvent event, + AvahiRecord *record, + AvahiLookupResultFlags flags, + void* userdata) { + + AvahiSHostNameResolver *r = userdata; + + assert(rr); + assert(r); + + + switch (event) { + case AVAHI_BROWSER_NEW: + assert(record); + assert(record->key->type == AVAHI_DNS_TYPE_A || record->key->type == AVAHI_DNS_TYPE_AAAA); + + 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->address_record) { + r->address_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_A || record->key->type == AVAHI_DNS_TYPE_AAAA); + + if (r->address_record && avahi_record_equal_no_ttl(record, r->address_record)) { + avahi_record_unref(r->address_record); + r->address_record = NULL; + + r->flags = flags; + + + /** 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; + + case AVAHI_BROWSER_CACHE_EXHAUSTED: + case AVAHI_BROWSER_ALL_FOR_NOW: + /* Ignore */ + break; + + case AVAHI_BROWSER_FAILURE: + + /* Stop browsers */ + + if (r->record_browser_aaaa) + avahi_s_record_browser_free(r->record_browser_aaaa); + if (r->record_browser_a) + avahi_s_record_browser_free(r->record_browser_a); + + r->record_browser_a = r->record_browser_aaaa = NULL; + r->flags = flags; + + finish(r, AVAHI_RESOLVER_FAILURE); + break; + } +} + +AvahiSHostNameResolver *avahi_s_host_name_resolver_new( + AvahiServer *server, + AvahiIfIndex interface, + AvahiProtocol protocol, + const char *host_name, + AvahiProtocol aprotocol, + AvahiLookupFlags flags, + AvahiSHostNameResolverCallback callback, + void* userdata) { + + AvahiSHostNameResolver *r; + AvahiKey *k; + + assert(server); + assert(host_name); + 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_is_valid_fqdn(host_name), AVAHI_ERR_INVALID_HOST_NAME); + AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(aprotocol), AVAHI_ERR_INVALID_PROTOCOL); + AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS); + + if (!(r = avahi_new(AvahiSHostNameResolver, 1))) { + avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY); + return NULL; + } + + r->server = server; + r->host_name = avahi_normalize_name_strdup(host_name); + r->callback = callback; + r->userdata = userdata; + r->address_record = NULL; + r->interface = interface; + r->protocol = protocol; + r->flags = 0; + + r->record_browser_a = r->record_browser_aaaa = NULL; + + r->time_event = NULL; + + AVAHI_LLIST_PREPEND(AvahiSHostNameResolver, resolver, server->host_name_resolvers, r); + + r->record_browser_aaaa = r->record_browser_a = NULL; + + if (aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_UNSPEC) { + k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A); + r->record_browser_a = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, r); + avahi_key_unref(k); + + if (!r->record_browser_a) + goto fail; + } + + if (aprotocol == AVAHI_PROTO_INET6 || aprotocol == AVAHI_PROTO_UNSPEC) { + k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA); + r->record_browser_aaaa = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, r); + avahi_key_unref(k); + + if (!r->record_browser_aaaa) + goto fail; + } + + assert(r->record_browser_aaaa || r->record_browser_a); + + start_timeout(r); + + return r; + +fail: + avahi_s_host_name_resolver_free(r); + return NULL; +} + +void avahi_s_host_name_resolver_free(AvahiSHostNameResolver *r) { + assert(r); + + AVAHI_LLIST_REMOVE(AvahiSHostNameResolver, resolver, r->server->host_name_resolvers, r); + + 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); + + if (r->time_event) + avahi_time_event_free(r->time_event); + + if (r->address_record) + avahi_record_unref(r->address_record); + + avahi_free(r->host_name); + avahi_free(r); +} |