MyFavMirrors
/
owntone-server
mirror of https://github.com/owntone/owntone-server.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
owntone-server/src/mdns_dnssd.c

931 lines
23 KiB
C
Raw Permalink Blame History

/*
* Bonjour mDNS backend, with libevent polling
*
* Copyright (c) Scott Shambarger <devel@shambarger.net>
* Copyright (C) 2009-2011 Julien BLACHE <jb@jblache.org>
* Copyright (C) 2005 Sebastian Dr<44>ge <slomo@ubuntu.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; 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 "mdns.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <unistd.h>
#include <event2/event.h>
#include <dns_sd.h>
/* timeout for service resolves */
#define MDNS_RESOLVE_TIMEOUT_SECS 5
// Hack for FreeBSD, don't want to bother with sysconf()
#ifndef HOST_NAME_MAX
# include <limits.h>
# define HOST_NAME_MAX _POSIX_HOST_NAME_MAX
#endif
#include "logger.h"
#include "conffile.h"
/* Main event base, from main.c */
extern struct event_base *evbase_main;
static DNSServiceRef mdns_sdref_main;
static struct event *mdns_ev_main;
/* registered services last the life of the program */
struct mdns_service {
struct mdns_service *next;
/* allocated */
DNSServiceRef sdref;
TXTRecordRef txtRecord;
};
static struct mdns_service *mdns_services = NULL;
/* we keep records forever to display names in logs when
registered or renamed */
struct mdns_record {
struct mdns_record *next;
/* allocated */
char *name;
/* references */
DNSRecordRef recRef;
uint16_t rrtype;
};
static struct mdns_record *mdns_records = NULL;
struct mdns_addr_lookup {
struct mdns_addr_lookup *next;
/* allocated */
DNSServiceRef sdref;
struct keyval txt_kv;
/* references */
u_int16_t port;
struct mdns_resolver *rs;
};
/* resolvers and address lookups clean themselves up */
struct mdns_resolver
{
struct mdns_resolver *next;
/* allocated */
DNSServiceRef sdref;
char *service;
char *regtype;
char *domain;
struct event *timer;
struct mdns_addr_lookup *lookups;
/* references */
void *uuid;
uint32_t interface;
struct mdns_browser *mb;
};
/* browsers keep running for the life of the program */
struct mdns_browser
{
struct mdns_browser *next;
/* allocated */
DNSServiceRef sdref;
struct mdns_resolver *resolvers;
char *regtype;
/* references */
enum mdns_options flags;
mdns_browse_cb cb;
DNSServiceProtocol protocol;
void *res_uuid;
};
static struct mdns_browser *mdns_browsers = NULL;
#define IPV4LL_NETWORK 0xA9FE0000
#define IPV4LL_NETMASK 0xFFFF0000
#define IPV6LL_NETWORK 0xFE80
#define IPV6LL_NETMASK 0xFFC0
static int
is_v4ll(struct in_addr *addr)
{
return ((ntohl(addr->s_addr) & IPV4LL_NETMASK) == IPV4LL_NETWORK);
}
static int
is_v6ll(struct in6_addr *addr)
{
return ((((addr->s6_addr[0] << 8) | addr->s6_addr[1]) & IPV6LL_NETMASK)
== IPV6LL_NETWORK);
}
/* mDNS interface - to be called only from the main thread */
static int
mdns_service_free(struct mdns_service *s)
{
if(! s)
return -1;
/* free sdref, then everything else */
if(s->sdref)
DNSServiceRefDeallocate(s->sdref);
TXTRecordDeallocate(&(s->txtRecord));
free(s);
return -1;
}
static int
mdns_addr_lookup_free(struct mdns_addr_lookup *lu)
{
if (! lu)
return -1;
if(lu->sdref)
DNSServiceRefDeallocate(lu->sdref);
keyval_clear(&lu->txt_kv);
free(lu);
return -1;
}
static int
mdns_resolver_free(struct mdns_resolver *rs) {
struct mdns_addr_lookup *lu;
if (! rs)
return -1;
/* free/cancel all lookups */
for(lu = rs->lookups; lu; lu = rs->lookups)
{
rs->lookups = lu->next;
mdns_addr_lookup_free(lu);
}
if(rs->timer)
event_free(rs->timer);
if(rs->sdref)
DNSServiceRefDeallocate(rs->sdref);
free(rs->service);
free(rs->regtype);
free(rs->domain);
free(rs);
return -1;
}
static int
mdns_browser_free(struct mdns_browser *mb)
{
struct mdns_resolver *rs;
if(! mb)
return -1;
/* free all resolvers */
for(rs = mb->resolvers; rs; rs = mb->resolvers)
{
mb->resolvers = rs->next;
mdns_resolver_free(rs);
}
/* free sdref, then everything else */
if(mb->sdref)
DNSServiceRefDeallocate(mb->sdref);
free(mb->regtype);
free(mb);
return -1;
}
static int
mdns_record_free(struct mdns_record *r)
{
if (! r)
return -1;
free(r->name);
free(r);
return -1;
}
static int
mdns_main_free(void)
{
struct mdns_service *s;
struct mdns_browser *mb;
struct mdns_record *r;
for(s = mdns_services; mdns_services; s = mdns_services)
{
mdns_services = s->next;
mdns_service_free(s);
}
for (mb = mdns_browsers; mdns_browsers; mb = mdns_browsers)
{
mdns_browsers = mb->next;
mdns_browser_free(mb);
}
for (r = mdns_records; mdns_records; r = mdns_records)
{
mdns_records = r->next;
mdns_record_free(r);
}
if(mdns_ev_main)
event_free(mdns_ev_main);
mdns_ev_main = NULL;
if(mdns_sdref_main)
DNSServiceRefDeallocate(mdns_sdref_main);
mdns_sdref_main = NULL;
return -1;
}
void
mdns_deinit(void)
{
mdns_main_free();
}
static void
mdns_event_cb(evutil_socket_t fd, short flags, void *data) {
DNSServiceErrorType err;
err = DNSServiceProcessResult(mdns_sdref_main);
if (err != kDNSServiceErr_NoError)
DPRINTF(E_LOG, L_MDNS, "DNSServiceProcessResult error %d\n", err);
}
int
mdns_init(void)
{
DNSServiceErrorType err;
int fd;
int ret;
DPRINTF(E_DBG, L_MDNS, "Initializing DNS_SD mDNS\n");
mdns_services = NULL;
mdns_browsers = NULL;
mdns_records = NULL;
mdns_sdref_main = NULL;
mdns_ev_main = NULL;
err = DNSServiceCreateConnection(&mdns_sdref_main);
if (err != kDNSServiceErr_NoError)
{
DPRINTF(E_LOG, L_MDNS, "Could not create mDNS connection\n");
return -1;
}
fd = DNSServiceRefSockFD(mdns_sdref_main);
if (fd == -1) {
DPRINTF(E_LOG, L_MDNS, "DNSServiceRefSockFD failed\n");
return mdns_main_free();
}
mdns_ev_main = event_new(evbase_main, fd, EV_PERSIST | EV_READ,
mdns_event_cb, NULL);
if (! mdns_ev_main)
{
DPRINTF(E_LOG, L_MDNS, "Could not make new event in mdns\n");
return mdns_main_free();
}
ret = event_add(mdns_ev_main, NULL);
if (ret != 0)
{
DPRINTF(E_LOG, L_MDNS, "Could not add new event in mdns\n");
return mdns_main_free();
}
return 0;
}
static void
mdns_register_callback(DNSServiceRef sdRef, DNSServiceFlags flags,
DNSServiceErrorType errorCode, const char *name,
const char *regtype, const char *domain,
void *context) {
switch (errorCode) {
case kDNSServiceErr_NoError:
DPRINTF(E_DBG, L_MDNS, "Successfully added mDNS service '%s.%s'\n",
name, regtype);
break;
case kDNSServiceErr_NameConflict:
DPRINTF(E_DBG, L_MDNS,
"Name collision for service '%s.%s' - automatically assigning new name\n",
name, regtype);
break;
case kDNSServiceErr_NoMemory:
DPRINTF(E_DBG, L_MDNS, "Out of memory registering service %s\n", name);
break;
default:
DPRINTF(E_DBG, L_MDNS, "Unspecified error registering service %s, error %d\n",
name, errorCode);
}
}
int
mdns_register(char *name, char *regtype, int port, char **txt)
{
struct mdns_service *s;
DNSServiceErrorType err;
int i;
char *eq;
DPRINTF(E_DBG, L_MDNS, "Adding mDNS service '%s.%s'\n", name, regtype);
s = calloc(1, sizeof(*s));
if (!s)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory registering service.\n");
return -1;
}
TXTRecordCreate(&(s->txtRecord), 0, NULL);
for (i = 0; txt && txt[i]; i++)
{
if ((eq = strchr(txt[i], '=')))
{
*eq = '\0';
eq++;
err = TXTRecordSetValue(&(s->txtRecord), txt[i], strlen(eq) * sizeof(char), eq);
*(--eq) = '=';
if (err != kDNSServiceErr_NoError)
{
DPRINTF(E_LOG, L_MDNS, "Could not set TXT record value\n");
return mdns_service_free(s);
}
}
}
s->sdref = mdns_sdref_main;
err = DNSServiceRegister(&(s->sdref), kDNSServiceFlagsShareConnection, 0,
name, regtype, NULL, NULL, htons(port),
TXTRecordGetLength(&(s->txtRecord)),
TXTRecordGetBytesPtr(&(s->txtRecord)),
mdns_register_callback, NULL);
if (err != kDNSServiceErr_NoError)
{
DPRINTF(E_LOG, L_MDNS, "Error registering service '%s.%s'\n",
name, regtype);
s->sdref = NULL;
return mdns_service_free(s);
}
s->next = mdns_services;
mdns_services = s;
return 0;
}
static void
mdns_record_callback(DNSServiceRef sdRef, DNSRecordRef RecordRef,
DNSServiceFlags flags, DNSServiceErrorType errorCode,
void *context)
{
struct mdns_record *r;
r = context;
switch (errorCode) {
case kDNSServiceErr_NoError:
DPRINTF(E_DBG, L_MDNS, "Successfully added mDNS record %s\n", r->name);
break;
case kDNSServiceErr_NameConflict:
DPRINTF(E_DBG, L_MDNS, "Record ame collision - automatically assigning new name\n");
break;
case kDNSServiceErr_NoMemory:
DPRINTF(E_DBG, L_MDNS, "Out of memory registering record %s\n", r->name);
break;
default:
DPRINTF(E_DBG, L_MDNS, "Unspecified error registering record %s, error %d\n",
r->name, errorCode);
}
}
static int
mdns_register_record(uint16_t rrtype, const char *name, uint16_t rdlen,
const void *rdata)
{
struct mdns_record *r;
DNSServiceErrorType err;
DPRINTF(E_DBG, L_MDNS, "Adding mDNS record %s/%u\n", name, rrtype);
r = calloc(1, sizeof(*r));
if (!r)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory adding record.\n");
return -1;
}
r->name = strdup(name);
if (!(r->name))
{
DPRINTF(E_LOG, L_MDNS, "Out of memory adding record.\n");
return mdns_record_free(r);
}
r->rrtype = rrtype;
err = DNSServiceRegisterRecord(mdns_sdref_main, &r->recRef,
kDNSServiceFlagsShared, 0, r->name,
r->rrtype, kDNSServiceClass_IN, rdlen, rdata,
0, mdns_record_callback, r);
if (err != kDNSServiceErr_NoError)
{
DPRINTF(E_LOG, L_MDNS, "Error registering record %s, error %d\n", name,
err);
return mdns_record_free(r);
}
/* keep these around so we can display r->name in the callback */
r->next = mdns_records;
mdns_records = r;
return 0;
}
int
mdns_cname(char *name)
{
char hostname[HOST_NAME_MAX + 1];
// Includes room for "..local" and 0-terminator
char rdata[HOST_NAME_MAX + 8];
int count;
int i;
int ret;
ret = gethostname(hostname, HOST_NAME_MAX);
if (ret < 0)
{
DPRINTF(E_LOG, L_MDNS, "Could not add CNAME %s, gethostname failed\n",
name);
return -1;
}
// Note, gethostname does not guarantee 0-termination
hostname[HOST_NAME_MAX] = 0;
ret = snprintf(rdata, sizeof(rdata), ".%s.local", hostname);
if (!(ret > 0 && ret < sizeof(rdata)))
{
DPRINTF(E_LOG, L_MDNS, "Could not add CNAME %s, hostname is invalid\n",
name);
return -1;
}
// Convert to dns string: .myserver.local -> \12myserver\6local
count = 0;
for (i = ret - 1; i >= 0; i--)
{
if (rdata[i] == '.')
{
rdata[i] = count;
count = 0;
}
else
count++;
}
return mdns_register_record(kDNSServiceType_CNAME, name, (uint16_t)ret,
rdata);
}
static void
mdns_browse_call_cb(struct mdns_addr_lookup *lu, const char *hostname,
const struct sockaddr *address)
{
char addr_str[INET6_ADDRSTRLEN];
if (address->sa_family == AF_INET)
{
struct sockaddr_in *addr = (struct sockaddr_in *)address;
if (!inet_ntop(AF_INET, &addr->sin_addr, addr_str, sizeof(addr_str)))
{
DPRINTF(E_LOG, L_MDNS, "Could not print IPv4 address: %s\n",
strerror(errno));
return;
}
if (!(lu->rs->mb->protocol & kDNSServiceProtocol_IPv4))
{
DPRINTF(E_DBG, L_MDNS,
"Discarding IPv4, not interested (service %s)\n",
lu->rs->service);
return;
}
else if (is_v4ll(&addr->sin_addr))
{
DPRINTF(E_WARN, L_MDNS,
"Ignoring announcement from %s, address %s is link-local\n",
hostname, addr_str);
return;
}
}
else if (address->sa_family == AF_INET6)
{
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)address;
if (!inet_ntop(AF_INET6, &addr6->sin6_addr, addr_str, sizeof(addr_str)))
{
DPRINTF(E_LOG, L_MDNS, "Could not print IPv6 address: %s\n",
strerror(errno));
return;
}
if (!(lu->rs->mb->protocol & kDNSServiceProtocol_IPv6))
{
DPRINTF(E_DBG, L_MDNS,
"Discarding IPv6, not interested (service %s)\n",
lu->rs->service);
return;
}
else if (is_v6ll(&addr6->sin6_addr))
{
DPRINTF(E_WARN, L_MDNS,
"Ignoring announcement from %s, address %s is link-local\n",
hostname, addr_str);
return;
}
}
DPRINTF(E_DBG, L_MDNS, "Service %s, hostname %s resolved to %s\n",
lu->rs->service, hostname, addr_str);
/* Execute callback (mb->cb) with all the data */
lu->rs->mb->cb(lu->rs->service, lu->rs->regtype, lu->rs->domain, hostname,
address->sa_family, addr_str, lu->port, &lu->txt_kv);
}
static void
mdns_lookup_callback(DNSServiceRef sdRef, DNSServiceFlags flags,
uint32_t interfaceIndex, DNSServiceErrorType errorCode,
const char *hostname, const struct sockaddr *address,
uint32_t ttl, void *context)
{
struct mdns_addr_lookup *lu;
lu = context;
if (errorCode != kDNSServiceErr_NoError )
{
DPRINTF(E_LOG, L_MDNS, "Error resolving hostname '%s', error %d\n",
hostname, errorCode);
return;
}
if (flags & kDNSServiceFlagsAdd)
mdns_browse_call_cb(lu, hostname, address);
}
static int
mdns_addr_lookup_start(struct mdns_resolver *rs, uint32_t interfaceIndex,
const char *hosttarget, uint16_t port, uint16_t txtLen,
const unsigned char *txtRecord)
{
struct mdns_addr_lookup *lu;
DNSServiceErrorType err;
char key[256];
int i;
uint8_t valueLen;
const char *value;
int ret;
lu = calloc(1, sizeof(*lu));
if (!lu)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory creating address lookup.\n");
return -1;
}
lu->port = port;
lu->rs = rs;
for (i=0; TXTRecordGetItemAtIndex(txtLen, txtRecord, i, sizeof(key),
key, &valueLen, (const void **)&value)
!= kDNSServiceErr_Invalid; i++)
{
ret = keyval_add_size(&lu->txt_kv, key, value, valueLen);
if (ret < 0)
{
DPRINTF(E_LOG, L_MDNS, "Could not build TXT record keyval\n");
return mdns_addr_lookup_free(lu);
}
}
lu->sdref = mdns_sdref_main;
err = DNSServiceGetAddrInfo(&lu->sdref, kDNSServiceFlagsShareConnection,
interfaceIndex, rs->mb->protocol, hosttarget,
mdns_lookup_callback, lu);
if (err != kDNSServiceErr_NoError)
{
DPRINTF(E_LOG, L_MDNS, "Failed to create service resolver.\n");
lu->sdref = NULL;
return mdns_addr_lookup_free(lu);
}
/* resolver now owns the lookup */
lu->next = rs->lookups;
rs->lookups = lu;
return 0;
}
static void
mdns_resolver_remove(struct mdns_resolver *rs)
{
struct mdns_resolver *cur;
/* remove from browser's resolver list */
if(rs->mb->resolvers == rs)
rs->mb->resolvers = rs->next;
else
{
for(cur = rs->mb->resolvers; cur; cur = cur->next)
if (cur->next == rs)
{
cur->next = rs->next;
break;
}
}
/* free resolver (which cancels resolve) */
mdns_resolver_free(rs);
}
static void
mdns_resolve_timeout_cb(evutil_socket_t fd, short flags, void *uuid) {
struct mdns_browser *mb;
struct mdns_resolver *rs = NULL;
for(mb = mdns_browsers; mb && !rs; mb = mb->next)
for(rs = mb->resolvers; rs; rs = rs->next)
if(rs->uuid == uuid)
{
DPRINTF(E_DBG, L_MDNS,
"Resolve finished for '%s' type '%s' interface %d\n",
rs->service, rs->regtype, rs->interface);
mdns_resolver_remove(rs);
break;
}
}
static void
mdns_resolve_callback(DNSServiceRef sdRef, DNSServiceFlags flags,
uint32_t interfaceIndex, DNSServiceErrorType errorCode,
const char *fullname, const char *hosttarget,
uint16_t port, uint16_t txtLen,
const unsigned char *txtRecord, void *context)
{
struct mdns_resolver *rs;
rs = context;
/* convert port to host order */
port = ntohs(port);
if (errorCode != kDNSServiceErr_NoError)
{
DPRINTF(E_LOG, L_MDNS, "Error resolving service '%s', error %d\n",
rs->service, errorCode);
}
else
{
DPRINTF(E_DBG, L_MDNS, "Bonjour resolved '%s' as '%s:%u' on interface %d\n",
fullname, hosttarget, port, interfaceIndex);
mdns_addr_lookup_start(rs, interfaceIndex, hosttarget, port,
txtLen, txtRecord);
}
}
static int
mdns_resolve_start(struct mdns_browser *mb, uint32_t interfaceIndex,
const char *serviceName, const char *regtype,
const char *replyDomain)
{
DNSServiceErrorType err;
struct mdns_resolver *rs;
struct timeval tv;
rs = calloc(1, sizeof(*rs));
if (!rs)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory creating service resolver.\n");
return -1;
}
rs->service = strdup(serviceName);
if (!rs->service)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory creating service resolver.\n");
return mdns_resolver_free(rs);
}
rs->regtype = strdup(regtype);
if (!rs->regtype)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory creating service resolver.\n");
return mdns_resolver_free(rs);
}
rs->domain = strdup(replyDomain);
if (!rs->domain)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory creating service resolver.\n");
return mdns_resolver_free(rs);
}
rs->mb = mb;
rs->interface = interfaceIndex;
/* create a timer with a uuid, so we can search for resolver without
leaking */
rs->uuid = ++(mb->res_uuid);
rs->timer = evtimer_new(evbase_main, mdns_resolve_timeout_cb, rs->uuid);
if(! rs->timer)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory creating service resolver timer.\n");
return mdns_resolver_free(rs);
}
rs->sdref = mdns_sdref_main;
err = DNSServiceResolve(&(rs->sdref), kDNSServiceFlagsShareConnection,
interfaceIndex, serviceName, regtype, replyDomain,
mdns_resolve_callback, rs);
if (err != kDNSServiceErr_NoError)
{
DPRINTF(E_LOG, L_MDNS, "Failed to create service resolver.\n");
rs->sdref = NULL;
return mdns_resolver_free(rs);
}
/* add to browser's resolvers */
rs->next = mb->resolvers;
mb->resolvers = rs;
/* setup a timeout to cancel the resolve */
tv.tv_sec = MDNS_RESOLVE_TIMEOUT_SECS;
tv.tv_usec = 0;
evtimer_add(rs->timer, &tv);
return 0;
}
static void
mdns_resolve_cancel(const struct mdns_browser *mb, uint32_t interfaceIndex,
const char *serviceName, const char *regtype,
const char *replyDomain) {
struct mdns_resolver *rs;
for(rs = mb->resolvers; rs; rs = rs->next)
{
if ((rs->interface == interfaceIndex)
&& (! strcasecmp(rs->service, serviceName))
&& (! strcmp(rs->regtype, regtype))
&& (! strcasecmp(rs->domain, replyDomain)))
{
/* remove from resolvers, and free (which cancels resolve) */
DPRINTF(E_DBG, L_MDNS, "Cancelling resolve for '%s'\n", rs->service);
mdns_resolver_remove(rs);
break;
}
}
return;
}
static void
mdns_browse_callback(DNSServiceRef sdRef, DNSServiceFlags flags,
uint32_t interfaceIndex, DNSServiceErrorType errorCode,
const char *serviceName, const char *regtype,
const char *replyDomain, void *context)
{
struct mdns_browser *mb;
if (errorCode != kDNSServiceErr_NoError)
{
// FIXME: if d/c, we sould recreate the browser?
DPRINTF(E_LOG, L_MDNS, "Bonjour browsing error %d\n", errorCode);
return;
}
mb = context;
if (flags & kDNSServiceFlagsAdd)
{
DPRINTF(E_DBG, L_MDNS,
"Bonjour Browser: NEW service '%s' type '%s' interface %d\n",
serviceName, regtype, interfaceIndex);
mdns_resolve_start(mb, interfaceIndex, serviceName, regtype,
replyDomain);
}
else
{
DPRINTF(E_DBG, L_MDNS,
"Bonjour Browser: REMOVE service '%s' type '%s' interface %d\n",
serviceName, regtype, interfaceIndex);
mdns_resolve_cancel(mb, interfaceIndex, serviceName, regtype,
replyDomain);
mb->cb(serviceName, regtype, replyDomain, NULL, 0, NULL, -1, NULL);
}
}
int
mdns_browse(char *regtype, mdns_browse_cb cb, enum mdns_options flags)
{
struct mdns_browser *mb;
DNSServiceErrorType err;
int family;
DPRINTF(E_DBG, L_MDNS, "Adding service browser for type %s\n", regtype);
CHECK_NULL(L_MDNS, mb = calloc(1, sizeof(*mb)));
mb->flags = flags;
mb->cb = cb;
if (flags & MDNS_IPV4ONLY || !cfg_getbool(cfg_getsec(cfg, "general"), "ipv6"))
family = AF_INET;
else
family = AF_UNSPEC;
/* flags are ignored in DNS-SD implementation */
switch(family) {
case AF_UNSPEC:
mb->protocol = kDNSServiceProtocol_IPv4 | kDNSServiceProtocol_IPv6;
break;
case AF_INET:
mb->protocol = kDNSServiceProtocol_IPv4;
break;
case AF_INET6:
mb->protocol = kDNSServiceProtocol_IPv6;
break;
default:
DPRINTF(E_LOG, L_MDNS, "Unrecognized protocol family %d.\n", family);
return mdns_browser_free(mb);
}
mb->regtype = strdup(regtype);
if (!mb->regtype)
{
DPRINTF(E_LOG, L_MDNS, "Out of memory creating service browser.\n");
return mdns_browser_free(mb);
}
mb->sdref = mdns_sdref_main;
err = DNSServiceBrowse(&(mb->sdref), kDNSServiceFlagsShareConnection, 0,
regtype, NULL, mdns_browse_callback, mb);
if (err != kDNSServiceErr_NoError)
{
DPRINTF(E_LOG, L_MDNS, "Failed to create service browser.\n");
mb->sdref = NULL;
return mdns_browser_free(mb);
}
mb->next = mdns_browsers;
mdns_browsers = mb;
return 0;
}
Reference in New Issue View Git Blame Copy Permalink