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