diff options
Diffstat (limited to 'release-0.6.9/avahi-core/resolve-service.c')
| -rw-r--r-- | release-0.6.9/avahi-core/resolve-service.c | 491 |
1 files changed, 491 insertions, 0 deletions
diff --git a/release-0.6.9/avahi-core/resolve-service.c b/release-0.6.9/avahi-core/resolve-service.c new file mode 100644 index 0000000..a897546 --- /dev/null +++ b/release-0.6.9/avahi-core/resolve-service.c @@ -0,0 +1,491 @@ +/* $Id$ */ + +/*** + 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 <string.h> +#include <stdio.h> +#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 AvahiSServiceResolver { + AvahiServer *server; + char *service_name; + char *service_type; + char *domain_name; + AvahiProtocol address_protocol; + + AvahiIfIndex interface; + AvahiProtocol protocol; + + AvahiSRecordBrowser *record_browser_srv; + AvahiSRecordBrowser *record_browser_txt; + AvahiSRecordBrowser *record_browser_a; + AvahiSRecordBrowser *record_browser_aaaa; + + AvahiRecord *srv_record, *txt_record, *address_record; + AvahiLookupResultFlags srv_flags, txt_flags, address_flags; + + AvahiSServiceResolverCallback callback; + void* userdata; + AvahiLookupFlags user_flags; + + AvahiTimeEvent *time_event; + + AVAHI_LLIST_FIELDS(AvahiSServiceResolver, resolver); +}; + +static void finish(AvahiSServiceResolver *r, AvahiResolverEvent event) { + AvahiLookupResultFlags flags; + + assert(r); + + if (r->time_event) { + avahi_time_event_free(r->time_event); + r->time_event = NULL; + } + + flags = + r->txt_flags | + r->srv_flags | + r->address_flags; + + switch (event) { + case AVAHI_RESOLVER_FAILURE: + + r->callback( + r, + r->interface, + r->protocol, + event, + r->service_name, + r->service_type, + r->domain_name, + NULL, + NULL, + 0, + NULL, + flags, + r->userdata); + + break; + + case AVAHI_RESOLVER_FOUND: { + AvahiAddress a; + + assert(event == AVAHI_RESOLVER_FOUND); + + assert(r->srv_record); + + if (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: + assert(0); + } + } + + r->callback( + r, + r->interface, + r->protocol, + event, + r->service_name, + r->service_type, + r->domain_name, + r->address_record ? r->address_record->key->name : r->srv_record->data.srv.name, + r->address_record ? &a : NULL, + r->srv_record->data.srv.port, + r->txt_record ? r->txt_record->data.txt.string_list : NULL, + flags, + r->userdata); + + break; + } + } +} + +static void time_event_callback(AvahiTimeEvent *e, void *userdata) { + AvahiSServiceResolver *r = userdata; + + assert(e); + assert(r); + + avahi_server_set_errno(r->server, AVAHI_ERR_TIMEOUT); + finish(r, AVAHI_RESOLVER_FAILURE); +} + +static void start_timeout(AvahiSServiceResolver *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) { + + 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; + } +} + +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; +} + +void avahi_s_service_resolver_free(AvahiSServiceResolver *r) { + assert(r); + + AVAHI_LLIST_REMOVE(AvahiSServiceResolver, resolver, r->server->service_resolvers, r); + + if (r->time_event) + avahi_time_event_free(r->time_event); + + 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); + + if (r->srv_record) + avahi_record_unref(r->srv_record); + if (r->txt_record) + avahi_record_unref(r->txt_record); + if (r->address_record) + avahi_record_unref(r->address_record); + + avahi_free(r->service_name); + avahi_free(r->service_type); + avahi_free(r->domain_name); + avahi_free(r); +} |