| /*** |
| 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->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); |
| } |
