101 lines
3.2 KiB
C
101 lines
3.2 KiB
C
/*
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* Embedded dns-sd client. This file is part of Shairport.
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* Copyright (c) Paul Lietar 2013
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "common.h"
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#include "mdns.h"
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#include <arpa/inet.h>
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#include <dns_sd.h>
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#include <stdlib.h>
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#include <string.h>
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static DNSServiceRef service;
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static int mdns_dns_sd_register(char *ap1name, __attribute__((unused)) char *ap2name, int port,
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__attribute__((unused)) char **txt_records,
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__attribute__((unused)) char **secondary_txt_records) {
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char *recordwithoutmetadata[] = {MDNS_RECORD_WITHOUT_METADATA, NULL};
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#ifdef CONFIG_METADATA
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char *recordwithmetadata[] = {MDNS_RECORD_WITH_METADATA, NULL};
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#endif
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char **record;
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#ifdef CONFIG_METADATA
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if (config.metadata_enabled)
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record = recordwithmetadata;
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else
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#endif
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record = recordwithoutmetadata;
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uint16_t length = 0;
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char **field;
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// Concatenate string contained i record into buf.
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for (field = record; *field; field++) {
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length += strlen(*field) + 1; // One byte for length each time
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}
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char *buf = malloc(length * sizeof(char));
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if (buf == NULL) {
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warn("dns_sd: buffer record allocation failed");
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return -1;
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}
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char *p = buf;
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for (field = record; *field; field++) {
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char *newp = stpcpy(p + 1, *field);
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*p = newp - p - 1;
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p = newp;
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}
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DNSServiceErrorType error;
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error = DNSServiceRegister(&service, 0, kDNSServiceInterfaceIndexAny, ap1name, config.regtype, "",
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NULL, htons((uint16_t)port), length, buf, NULL, NULL);
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free(buf);
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if (error == kDNSServiceErr_NoError)
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return 0;
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else {
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warn("dns-sd: DNSServiceRegister error %d", error);
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return -1;
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}
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}
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static void mdns_dns_sd_unregister(void) {
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if (service) {
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DNSServiceRefDeallocate(service);
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service = NULL;
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}
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}
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mdns_backend mdns_dns_sd = {.name = "dns-sd",
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.mdns_register = mdns_dns_sd_register,
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.mdns_unregister = mdns_dns_sd_unregister,
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.mdns_dacp_monitor_start = NULL,
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.mdns_dacp_monitor_set_id = NULL,
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.mdns_dacp_monitor_stop = NULL};
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