--- /dev/null
+/* $Id$ */
+
+/***
+ 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 <pthread.h>
+#include <assert.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <signal.h>
+#include <netinet/in.h>
+
+#include <avahi-common/simple-watch.h>
+#include <avahi-common/malloc.h>
+#include <avahi-common/error.h>
+#include <avahi-common/domain.h>
+#include <avahi-common/alternative.h>
+#include <avahi-client/client.h>
+
+#include "warn.h"
+#include "dns_sd.h"
+
+enum {
+ COMMAND_POLL = 'P',
+ COMMAND_QUIT = 'Q',
+ COMMAND_POLLED = 'D'
+};
+
+struct _DNSServiceRef_t {
+ int n_ref;
+
+ AvahiSimplePoll *simple_poll;
+
+ int thread_fd, main_fd;
+
+ pthread_t thread;
+ int thread_running;
+
+ pthread_mutex_t mutex;
+
+ void *context;
+ DNSServiceBrowseReply service_browser_callback;
+ DNSServiceResolveReply service_resolver_callback;
+ DNSServiceDomainEnumReply domain_browser_callback;
+ DNSServiceRegisterReply service_register_callback;
+
+ AvahiClient *client;
+ AvahiServiceBrowser *service_browser;
+ AvahiServiceResolver *service_resolver;
+ AvahiDomainBrowser *domain_browser;
+
+ char *service_name, *service_name_chosen, *service_regtype, *service_domain, *service_host;
+ uint16_t service_port;
+ AvahiIfIndex service_interface;
+ AvahiStringList *service_txt;
+
+ AvahiEntryGroup *entry_group;
+};
+
+#define ASSERT_SUCCESS(r) { int __ret = (r); assert(__ret == 0); }
+
+static DNSServiceErrorType map_error(int error) {
+ switch (error) {
+ case AVAHI_OK :
+ return kDNSServiceErr_NoError;
+
+ case AVAHI_ERR_BAD_STATE :
+ return kDNSServiceErr_BadState;
+
+ case AVAHI_ERR_INVALID_HOST_NAME:
+ case AVAHI_ERR_INVALID_DOMAIN_NAME:
+ case AVAHI_ERR_INVALID_TTL:
+ case AVAHI_ERR_IS_PATTERN:
+ case AVAHI_ERR_INVALID_RECORD:
+ case AVAHI_ERR_INVALID_SERVICE_NAME:
+ case AVAHI_ERR_INVALID_SERVICE_TYPE:
+ case AVAHI_ERR_INVALID_PORT:
+ case AVAHI_ERR_INVALID_KEY:
+ case AVAHI_ERR_INVALID_ADDRESS:
+ return kDNSServiceErr_BadParam;
+
+
+ case AVAHI_ERR_LOCAL_COLLISION:
+ return kDNSServiceErr_NameConflict;
+
+ case AVAHI_ERR_TOO_MANY_CLIENTS:
+ case AVAHI_ERR_TOO_MANY_OBJECTS:
+ case AVAHI_ERR_TOO_MANY_ENTRIES:
+ case AVAHI_ERR_ACCESS_DENIED:
+ return kDNSServiceErr_Refused;
+
+ case AVAHI_ERR_INVALID_OPERATION:
+ case AVAHI_ERR_INVALID_OBJECT:
+ return kDNSServiceErr_Invalid;
+
+ case AVAHI_ERR_NO_MEMORY:
+ return kDNSServiceErr_NoMemory;
+
+ case AVAHI_ERR_INVALID_INTERFACE:
+ case AVAHI_ERR_INVALID_PROTOCOL:
+ return kDNSServiceErr_BadInterfaceIndex;
+
+ case AVAHI_ERR_INVALID_FLAGS:
+ return kDNSServiceErr_BadFlags;
+
+ case AVAHI_ERR_NOT_FOUND:
+ return kDNSServiceErr_NoSuchName;
+
+ case AVAHI_ERR_VERSION_MISMATCH:
+ return kDNSServiceErr_Incompatible;
+
+ case AVAHI_ERR_NO_NETWORK:
+ case AVAHI_ERR_OS:
+ case AVAHI_ERR_INVALID_CONFIG:
+ case AVAHI_ERR_TIMEOUT:
+ case AVAHI_ERR_DBUS_ERROR:
+ case AVAHI_ERR_NOT_CONNECTED:
+ case AVAHI_ERR_NO_DAEMON:
+ break;
+
+ }
+
+ return kDNSServiceErr_Unknown;
+}
+
+static int read_command(int fd) {
+ ssize_t r;
+ char command;
+
+ assert(fd >= 0);
+
+ if ((r = read(fd, &command, 1)) != 1) {
+ fprintf(stderr, __FILE__": read() failed: %s\n", r < 0 ? strerror(errno) : "EOF");
+ return -1;
+ }
+
+ return command;
+}
+
+static int write_command(int fd, char reply) {
+ assert(fd >= 0);
+
+ if (write(fd, &reply, 1) != 1) {
+ fprintf(stderr, __FILE__": write() failed: %s\n", strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+static int poll_func(struct pollfd *ufds, unsigned int nfds, int timeout, void *userdata) {
+ DNSServiceRef sdref = userdata;
+ int ret;
+
+ assert(sdref);
+
+ ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
+
+/* fprintf(stderr, "pre-syscall\n"); */
+ ret = poll(ufds, nfds, timeout);
+/* fprintf(stderr, "post-syscall\n"); */
+
+ ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
+
+ return ret;
+}
+
+static void * thread_func(void *data) {
+ DNSServiceRef sdref = data;
+ sigset_t mask;
+
+ sigfillset(&mask);
+ pthread_sigmask(SIG_BLOCK, &mask, NULL);
+
+ sdref->thread = pthread_self();
+ sdref->thread_running = 1;
+
+ for (;;) {
+ char command;
+
+ if ((command = read_command(sdref->thread_fd)) < 0)
+ break;
+
+/* fprintf(stderr, "Command: %c\n", command); */
+
+ switch (command) {
+
+ case COMMAND_POLL:
+
+ ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
+
+
+ if (avahi_simple_poll_run(sdref->simple_poll) < 0) {
+ fprintf(stderr, __FILE__": avahi_simple_poll_run() failed.\n");
+ ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
+ break;
+ }
+
+ if (write_command(sdref->thread_fd, COMMAND_POLLED) < 0) {
+ ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
+ break;
+ }
+
+ ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
+
+ break;
+
+ case COMMAND_QUIT:
+ return NULL;
+ }
+
+ }
+
+ return NULL;
+}
+
+static DNSServiceRef sdref_new(void) {
+ int fd[2] = { -1, -1 };
+ DNSServiceRef sdref = NULL;
+ pthread_mutexattr_t mutex_attr;
+
+ if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0)
+ goto fail;
+
+ if (!(sdref = avahi_new(struct _DNSServiceRef_t, 1)))
+ goto fail;
+
+ sdref->n_ref = 1;
+ sdref->thread_fd = fd[0];
+ sdref->main_fd = fd[1];
+
+ sdref->client = NULL;
+ sdref->service_browser = NULL;
+ sdref->service_resolver = NULL;
+ sdref->domain_browser = NULL;
+ sdref->entry_group = NULL;
+
+ sdref->service_name = sdref->service_name_chosen = sdref->service_regtype = sdref->service_domain = sdref->service_host = NULL;
+ sdref->service_txt = NULL;
+
+ ASSERT_SUCCESS(pthread_mutexattr_init(&mutex_attr));
+ pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_RECURSIVE);
+ ASSERT_SUCCESS(pthread_mutex_init(&sdref->mutex, NULL));
+
+ sdref->thread_running = 0;
+
+ if (!(sdref->simple_poll = avahi_simple_poll_new()))
+ goto fail;
+
+ avahi_simple_poll_set_func(sdref->simple_poll, poll_func, sdref);
+
+ /* Start simple poll */
+ if (avahi_simple_poll_prepare(sdref->simple_poll, -1) < 0)
+ goto fail;
+
+ /* Queue a initiall POLL command for the thread */
+ if (write_command(sdref->main_fd, COMMAND_POLL) < 0)
+ goto fail;
+
+ if (pthread_create(&sdref->thread, NULL, thread_func, sdref) != 0)
+ goto fail;
+
+ sdref->thread_running = 1;
+
+ return sdref;
+
+fail:
+
+ if (sdref)
+ DNSServiceRefDeallocate(sdref);
+
+ return NULL;
+}
+
+static void sdref_free(DNSServiceRef sdref) {
+ assert(sdref);
+
+ if (sdref->thread_running) {
+ write_command(sdref->main_fd, COMMAND_QUIT);
+ avahi_simple_poll_wakeup(sdref->simple_poll);
+ pthread_join(sdref->thread, NULL);
+ }
+
+ if (sdref->client)
+ avahi_client_free(sdref->client);
+
+ if (sdref->thread_fd >= 0)
+ close(sdref->thread_fd);
+
+ if (sdref->main_fd >= 0)
+ close(sdref->main_fd);
+
+ if (sdref->simple_poll)
+ avahi_simple_poll_free(sdref->simple_poll);
+
+ pthread_mutex_destroy(&sdref->mutex);
+
+ avahi_free(sdref->service_name);
+ avahi_free(sdref->service_name_chosen);
+ avahi_free(sdref->service_regtype);
+ avahi_free(sdref->service_domain);
+ avahi_free(sdref->service_host);
+
+ avahi_string_list_free(sdref->service_txt);
+
+ avahi_free(sdref);
+}
+
+static void sdref_ref(DNSServiceRef sdref) {
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ sdref->n_ref++;
+}
+
+static void sdref_unref(DNSServiceRef sdref) {
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ if (--(sdref->n_ref) <= 0)
+ sdref_free(sdref);
+}
+
+int DNSSD_API DNSServiceRefSockFD(DNSServiceRef sdref) {
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ AVAHI_WARN_LINKAGE;
+
+ return sdref->main_fd;
+}
+
+DNSServiceErrorType DNSSD_API DNSServiceProcessResult(DNSServiceRef sdref) {
+ DNSServiceErrorType ret = kDNSServiceErr_Unknown;
+
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ AVAHI_WARN_LINKAGE;
+
+ sdref_ref(sdref);
+
+ ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
+
+ /* Cleanup notification socket */
+ if (read_command(sdref->main_fd) != COMMAND_POLLED)
+ goto finish;
+
+ if (avahi_simple_poll_dispatch(sdref->simple_poll) < 0)
+ goto finish;
+
+ if (sdref->n_ref > 1) /* Perhaps we should die */
+
+ /* Dispatch events */
+ if (avahi_simple_poll_prepare(sdref->simple_poll, -1) < 0)
+ goto finish;
+
+ if (sdref->n_ref > 1)
+
+ /* Request the poll */
+ if (write_command(sdref->main_fd, COMMAND_POLL) < 0)
+ goto finish;
+
+ ret = kDNSServiceErr_NoError;
+
+finish:
+
+ ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
+
+ sdref_unref(sdref);
+
+ return ret;
+}
+
+void DNSSD_API DNSServiceRefDeallocate(DNSServiceRef sdref) {
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ AVAHI_WARN_LINKAGE;
+
+ sdref_unref(sdref);
+}
+
+static void service_browser_callback(
+ AvahiServiceBrowser *b,
+ AvahiIfIndex interface,
+ AvahiProtocol protocol,
+ AvahiBrowserEvent event,
+ const char *name,
+ const char *type,
+ const char *domain,
+ AvahiLookupResultFlags flags,
+ void *userdata) {
+
+ DNSServiceRef sdref = userdata;
+
+ assert(b);
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ switch (event) {
+ case AVAHI_BROWSER_NEW:
+ sdref->service_browser_callback(sdref, kDNSServiceFlagsAdd, interface, kDNSServiceErr_NoError, name, type, domain, sdref->context);
+ break;
+
+ case AVAHI_BROWSER_REMOVE:
+ sdref->service_browser_callback(sdref, 0, interface, kDNSServiceErr_NoError, name, type, domain, sdref->context);
+ break;
+
+ case AVAHI_BROWSER_FAILURE:
+ sdref->service_browser_callback(sdref, 0, interface, kDNSServiceErr_Unknown, NULL, NULL, NULL, sdref->context);
+ break;
+
+ case AVAHI_BROWSER_NOT_FOUND:
+ sdref->service_browser_callback(sdref, 0, interface, kDNSServiceErr_NoSuchName, NULL, NULL, NULL, sdref->context);
+ break;
+
+ case AVAHI_BROWSER_CACHE_EXHAUSTED:
+ case AVAHI_BROWSER_ALL_FOR_NOW:
+ break;
+ }
+}
+
+static void generic_client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
+ DNSServiceRef sdref = userdata;
+
+ assert(s);
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ switch (state) {
+ case AVAHI_CLIENT_DISCONNECTED: {
+
+ if (sdref->service_browser_callback)
+ sdref->service_browser_callback(sdref, 0, 0, kDNSServiceErr_Unknown, NULL, NULL, NULL, sdref->context);
+ else if (sdref->service_resolver_callback)
+ sdref->service_resolver_callback(sdref, 0, 0, kDNSServiceErr_Unknown, NULL, NULL, 0, 0, NULL, sdref->context);
+ else if (sdref->domain_browser_callback)
+ sdref->domain_browser_callback(sdref, 0, 0, kDNSServiceErr_Unknown, NULL, sdref->context);
+
+ break;
+ }
+
+ case AVAHI_CLIENT_S_RUNNING:
+ case AVAHI_CLIENT_S_COLLISION:
+ case AVAHI_CLIENT_S_INVALID:
+ case AVAHI_CLIENT_S_REGISTERING:
+ break;
+ }
+}
+
+DNSServiceErrorType DNSSD_API DNSServiceBrowse(
+ DNSServiceRef *ret_sdref,
+ DNSServiceFlags flags,
+ uint32_t interface,
+ const char *regtype,
+ const char *domain,
+ DNSServiceBrowseReply callback,
+ void *context) {
+
+ DNSServiceErrorType ret = kDNSServiceErr_Unknown;
+ int error;
+ DNSServiceRef sdref = NULL;
+ AvahiIfIndex ifindex;
+
+ AVAHI_WARN_LINKAGE;
+
+ assert(ret_sdref);
+ assert(regtype);
+ assert(domain);
+ assert(callback);
+
+ if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0)
+ return kDNSServiceErr_Unsupported;
+
+ if (!(sdref = sdref_new()))
+ return kDNSServiceErr_Unknown;
+
+ sdref->context = context;
+ sdref->service_browser_callback = callback;
+
+ ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
+
+ if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), generic_client_callback, sdref, &error))) {
+ ret = map_error(error);
+ goto finish;
+ }
+
+ ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
+
+ if (!(sdref->service_browser = avahi_service_browser_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, regtype, domain, 0, service_browser_callback, sdref))) {
+ ret = map_error(avahi_client_errno(sdref->client));
+ goto finish;
+ }
+
+ ret = kDNSServiceErr_NoError;
+ *ret_sdref = sdref;
+
+finish:
+
+ ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
+
+ if (ret != kDNSServiceErr_NoError)
+ DNSServiceRefDeallocate(sdref);
+
+ return ret;
+}
+
+static void service_resolver_callback(
+ AvahiServiceResolver *r,
+ AvahiIfIndex interface,
+ AvahiProtocol protocol,
+ AvahiResolverEvent event,
+ const char *name,
+ const char *type,
+ const char *domain,
+ const char *host_name,
+ const AvahiAddress *a,
+ uint16_t port,
+ AvahiStringList *txt,
+ AvahiLookupResultFlags flags,
+ void *userdata) {
+
+ DNSServiceRef sdref = userdata;
+
+ assert(r);
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ switch (event) {
+ case AVAHI_RESOLVER_FOUND: {
+
+ char full_name[kDNSServiceMaxDomainName];
+ int ret;
+ char *p = NULL;
+ size_t l = 0;
+
+ if ((p = avahi_new0(char, (l = avahi_string_list_serialize(txt, NULL, 0))+1)))
+ avahi_string_list_serialize(txt, p, l);
+
+ ret = avahi_service_name_snprint(full_name, sizeof(full_name), name, type, domain);
+ assert(ret == AVAHI_OK);
+
+ sdref->service_resolver_callback(sdref, 0, interface, kDNSServiceErr_NoError, full_name, host_name, htons(port), l, p, sdref->context);
+
+ avahi_free(p);
+ break;
+ }
+
+ case AVAHI_RESOLVER_TIMEOUT:
+ case AVAHI_RESOLVER_NOT_FOUND:
+ sdref->service_resolver_callback(sdref, 0, interface, kDNSServiceErr_NoSuchName, NULL, NULL, 0, 0, NULL, sdref->context);
+ break;
+
+ case AVAHI_RESOLVER_FAILURE:
+ sdref->service_resolver_callback(sdref, 0, interface, kDNSServiceErr_Unknown, NULL, NULL, 0, 0, NULL, sdref->context);
+
+ }
+}
+
+DNSServiceErrorType DNSSD_API DNSServiceResolve(
+ DNSServiceRef *ret_sdref,
+ DNSServiceFlags flags,
+ uint32_t interface,
+ const char *name,
+ const char *regtype,
+ const char *domain,
+ DNSServiceResolveReply callback,
+ void *context) {
+
+ DNSServiceErrorType ret = kDNSServiceErr_Unknown;
+ int error;
+ DNSServiceRef sdref = NULL;
+ AvahiIfIndex ifindex;
+
+ AVAHI_WARN_LINKAGE;
+
+ assert(ret_sdref);
+ assert(name);
+ assert(regtype);
+ assert(domain);
+ assert(callback);
+
+ if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0)
+ return kDNSServiceErr_Unsupported;
+
+ if (!(sdref = sdref_new()))
+ return kDNSServiceErr_Unknown;
+
+ sdref->context = context;
+ sdref->service_resolver_callback = callback;
+
+ ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
+
+ if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), generic_client_callback, sdref, &error))) {
+ ret = map_error(error);
+ goto finish;
+ }
+
+ ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
+
+ if (!(sdref->service_resolver = avahi_service_resolver_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, name, regtype, domain, AVAHI_PROTO_UNSPEC, 0, service_resolver_callback, sdref))) {
+ ret = map_error(avahi_client_errno(sdref->client));
+ goto finish;
+ }
+
+
+ ret = kDNSServiceErr_NoError;
+ *ret_sdref = sdref;
+
+finish:
+
+ ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
+
+ if (ret != kDNSServiceErr_NoError)
+ DNSServiceRefDeallocate(sdref);
+
+ return ret;
+}
+
+int DNSSD_API DNSServiceConstructFullName (
+ char *fullName,
+ const char *service,
+ const char *regtype,
+ const char *domain) {
+
+ AVAHI_WARN_LINKAGE;
+
+ assert(fullName);
+ assert(regtype);
+ assert(domain);
+
+ if (avahi_service_name_snprint(fullName, kDNSServiceMaxDomainName, service, regtype, domain) < 0)
+ return -1;
+
+ return 0;
+}
+
+static void domain_browser_callback(
+ AvahiDomainBrowser *b,
+ AvahiIfIndex interface,
+ AvahiProtocol protocol,
+ AvahiBrowserEvent event,
+ const char *domain,
+ AvahiLookupResultFlags flags,
+ void *userdata) {
+
+ DNSServiceRef sdref = userdata;
+
+ assert(b);
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ switch (event) {
+ case AVAHI_BROWSER_NEW:
+ sdref->domain_browser_callback(sdref, kDNSServiceFlagsAdd, interface, kDNSServiceErr_NoError, domain, sdref->context);
+ break;
+
+ case AVAHI_BROWSER_REMOVE:
+ sdref->domain_browser_callback(sdref, 0, interface, kDNSServiceErr_NoError, domain, sdref->context);
+ break;
+
+ case AVAHI_BROWSER_FAILURE:
+ sdref->domain_browser_callback(sdref, 0, interface, kDNSServiceErr_Unknown, domain, sdref->context);
+ break;
+
+ case AVAHI_BROWSER_NOT_FOUND:
+ sdref->domain_browser_callback(sdref, 0, interface, kDNSServiceErr_NoSuchName, domain, sdref->context);
+ break;
+
+ case AVAHI_BROWSER_CACHE_EXHAUSTED:
+ case AVAHI_BROWSER_ALL_FOR_NOW:
+ break;
+ }
+}
+
+DNSServiceErrorType DNSSD_API DNSServiceEnumerateDomains(
+ DNSServiceRef *ret_sdref,
+ DNSServiceFlags flags,
+ uint32_t interface,
+ DNSServiceDomainEnumReply callback,
+ void *context) {
+
+ DNSServiceErrorType ret = kDNSServiceErr_Unknown;
+ int error;
+ DNSServiceRef sdref = NULL;
+ AvahiIfIndex ifindex;
+
+ AVAHI_WARN_LINKAGE;
+
+ assert(ret_sdref);
+ assert(callback);
+
+ if (interface == kDNSServiceInterfaceIndexLocalOnly ||
+ (flags != kDNSServiceFlagsBrowseDomains && flags != kDNSServiceFlagsRegistrationDomains))
+ return kDNSServiceErr_Unsupported;
+
+ if (!(sdref = sdref_new()))
+ return kDNSServiceErr_Unknown;
+
+ sdref->context = context;
+ sdref->domain_browser_callback = callback;
+
+ ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
+
+ if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), generic_client_callback, sdref, &error))) {
+ ret = map_error(error);
+ goto finish;
+ }
+
+ ifindex = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
+
+ if (!(sdref->domain_browser = avahi_domain_browser_new(sdref->client, ifindex, AVAHI_PROTO_UNSPEC, NULL,
+ flags == kDNSServiceFlagsRegistrationDomains ? AVAHI_DOMAIN_BROWSER_REGISTER : AVAHI_DOMAIN_BROWSER_BROWSE,
+ 0, domain_browser_callback, sdref))) {
+ ret = map_error(avahi_client_errno(sdref->client));
+ goto finish;
+ }
+
+ ret = kDNSServiceErr_NoError;
+ *ret_sdref = sdref;
+
+finish:
+
+ ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
+
+ if (ret != kDNSServiceErr_NoError)
+ DNSServiceRefDeallocate(sdref);
+
+ return ret;
+}
+
+static void reg_report_error(DNSServiceRef sdref, DNSServiceErrorType error) {
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ assert(sdref->service_register_callback);
+
+ sdref->service_register_callback(
+ sdref, 0, error,
+ sdref->service_name_chosen ? sdref->service_name_chosen : sdref->service_name,
+ sdref->service_regtype,
+ sdref->service_domain,
+ sdref->context);
+}
+
+static int reg_create_service(DNSServiceRef sdref) {
+ int ret;
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ if ((ret = avahi_entry_group_add_service_strlst(
+ sdref->entry_group,
+ sdref->service_interface,
+ AVAHI_PROTO_UNSPEC,
+ 0,
+ sdref->service_name_chosen,
+ sdref->service_regtype,
+ sdref->service_domain,
+ sdref->service_host,
+ sdref->service_port,
+ sdref->service_txt)) < 0)
+ return ret;
+
+ if ((ret = avahi_entry_group_commit(sdref->entry_group)) < 0)
+ return ret;
+
+ return 0;
+}
+
+static void reg_client_callback(AvahiClient *s, AvahiClientState state, void* userdata) {
+ DNSServiceRef sdref = userdata;
+
+ assert(s);
+ assert(sdref);
+ assert(sdref->n_ref >= 1);
+
+ /* We've not been setup completely */
+ if (!sdref->entry_group)
+ return;
+
+ switch (state) {
+ case AVAHI_CLIENT_DISCONNECTED: {
+
+ reg_report_error(sdref, kDNSServiceErr_NoError);
+ break;
+ }
+
+ case AVAHI_CLIENT_S_RUNNING: {
+ int ret;
+
+ if (!sdref->service_name) {
+ const char *n;
+ /* If the service name is taken from the host name, copy that */
+
+ avahi_free(sdref->service_name_chosen);
+
+ if (!(n = avahi_client_get_host_name(sdref->client))) {
+ reg_report_error(sdref, map_error(avahi_client_errno(sdref->client)));
+ return;
+ }
+
+ if (!(sdref->service_name_chosen = avahi_strdup(n))) {
+ reg_report_error(sdref, kDNSServiceErr_NoMemory);
+ return;
+ }
+ }
+
+ /* Register the service */
+
+ if ((ret = reg_create_service(sdref)) < 0) {
+ reg_report_error(sdref, map_error(ret));
+ return;
+ }
+
+ break;
+ }
+
+ case AVAHI_CLIENT_S_COLLISION:
+
+ /* Remove our entry */
+ avahi_entry_group_reset(sdref->entry_group);
+
+ break;
+
+ case AVAHI_CLIENT_S_INVALID:
+ case AVAHI_CLIENT_S_REGISTERING:
+ /* Ignore */
+ break;
+ }
+
+}
+
+static void reg_entry_group_callback(AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
+ DNSServiceRef sdref = userdata;
+
+ assert(g);
+
+ switch (state) {
+ case AVAHI_ENTRY_GROUP_ESTABLISHED:
+ /* Inform the user */
+ reg_report_error(sdref, kDNSServiceErr_NoError);
+
+ break;
+
+ case AVAHI_ENTRY_GROUP_COLLISION: {
+ char *n;
+ int ret;
+
+ /* Remove our entry */
+ avahi_entry_group_reset(sdref->entry_group);
+
+ assert(sdref->service_name_chosen);
+
+ /* Pick a new name */
+ if (!(n = avahi_alternative_service_name(sdref->service_name_chosen))) {
+ reg_report_error(sdref, kDNSServiceErr_NoMemory);
+ return;
+ }
+ avahi_free(sdref->service_name_chosen);
+ sdref->service_name_chosen = n;
+
+ /* Register the service with that new name */
+ if ((ret = reg_create_service(sdref)) < 0) {
+ reg_report_error(sdref, map_error(ret));
+ return;
+ }
+
+ break;
+ }
+
+ case AVAHI_ENTRY_GROUP_REGISTERING:
+ case AVAHI_ENTRY_GROUP_UNCOMMITED:
+ /* Ignore */
+ break;
+ }
+}
+
+DNSServiceErrorType DNSSD_API DNSServiceRegister (
+ DNSServiceRef *ret_sdref,
+ DNSServiceFlags flags,
+ uint32_t interface,
+ const char *name,
+ const char *regtype,
+ const char *domain,
+ const char *host,
+ uint16_t port,
+ uint16_t txtLen,
+ const void *txtRecord,
+ DNSServiceRegisterReply callback,
+ void *context) {
+
+ DNSServiceErrorType ret = kDNSServiceErr_Unknown;
+ int error;
+ DNSServiceRef sdref = NULL;
+
+ AVAHI_WARN_LINKAGE;
+
+ assert(ret_sdref);
+ assert(callback);
+ assert(regtype);
+
+ if (interface == kDNSServiceInterfaceIndexLocalOnly || flags)
+ return kDNSServiceErr_Unsupported;
+
+ if (!(sdref = sdref_new()))
+ return kDNSServiceErr_Unknown;
+
+ sdref->context = context;
+ sdref->service_register_callback = callback;
+
+ sdref->service_name = avahi_strdup(name);
+ sdref->service_regtype = avahi_strdup(regtype);
+ sdref->service_domain = avahi_strdup(domain);
+ sdref->service_host = avahi_strdup(host);
+ sdref->service_interface = interface == kDNSServiceInterfaceIndexAny ? AVAHI_IF_UNSPEC : (AvahiIfIndex) interface;
+ sdref->service_port = ntohs(port);
+ sdref->service_txt = txtRecord ? avahi_string_list_parse(txtRecord, txtLen) : NULL;
+
+ ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
+
+ if (!(sdref->client = avahi_client_new(avahi_simple_poll_get(sdref->simple_poll), reg_client_callback, sdref, &error))) {
+ ret = map_error(error);
+ goto finish;
+ }
+
+ if (!sdref->service_domain) {
+ const char *d;
+
+ if (!(d = avahi_client_get_domain_name(sdref->client))) {
+ ret = map_error(avahi_client_errno(sdref->client));
+ goto finish;
+ }
+
+ if (!(sdref->service_domain = avahi_strdup(d))) {
+ ret = kDNSServiceErr_NoMemory;
+ goto finish;
+ }
+ }
+
+ if (!(sdref->entry_group = avahi_entry_group_new(sdref->client, reg_entry_group_callback, sdref))) {
+ ret = map_error(avahi_client_errno(sdref->client));
+ goto finish;
+ }
+
+ if (avahi_client_get_state(sdref->client) == AVAHI_CLIENT_S_RUNNING) {
+ const char *n;
+
+ if (sdref->service_name)
+ n = sdref->service_name;
+ else {
+ if (!(n = avahi_client_get_host_name(sdref->client))) {
+ ret = map_error(avahi_client_errno(sdref->client));
+ goto finish;
+ }
+ }
+
+ if (!(sdref->service_name_chosen = avahi_strdup(n))) {
+ ret = kDNSServiceErr_NoMemory;
+ goto finish;
+ }
+
+
+ if ((error = reg_create_service(sdref)) < 0) {
+ ret = map_error(error);
+ goto finish;
+ }
+ }
+
+ ret = kDNSServiceErr_NoError;
+ *ret_sdref = sdref;
+
+finish:
+
+ ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
+
+ if (ret != kDNSServiceErr_NoError)
+ DNSServiceRefDeallocate(sdref);
+
+ return ret;
+}
+
--- /dev/null
+/*
+ * Copyright (c) 2003-2004, Apple Computer, Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of its
+ * contributors may be used to endorse or promote products derived from this
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _DNS_SD_H
+#define _DNS_SD_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* standard calling convention under Win32 is __stdcall */
+#if defined(_WIN32)
+#define DNSSD_API __stdcall
+#else
+#define DNSSD_API
+#endif
+
+#if defined(__FreeBSD_version) && (__FreeBSD_version < 500000)
+/* stdint.h does not exist on FreeBSD 4.x; its types are defined in sys/types.h instead */
+#include <sys/types.h>
+#elif defined(__sun__)
+#include <sys/types.h>
+#elif defined(_WIN32)
+#include <windows.h>
+#define _UNUSED
+#define bzero(a, b) memset(a, 0, b)
+#ifndef _MSL_STDINT_H
+typedef UINT8 uint8_t;
+typedef INT8 int8_t;
+typedef UINT16 uint16_t;
+typedef INT16 int16_t;
+typedef UINT32 uint32_t;
+typedef INT32 int32_t;
+#endif
+#else
+#include <stdint.h>
+#endif
+
+/* DNSServiceRef, DNSRecordRef
+ *
+ * Opaque internal data types.
+ * Note: client is responsible for serializing access to these structures if
+ * they are shared between concurrent threads.
+ */
+
+typedef struct _DNSServiceRef_t *DNSServiceRef;
+typedef struct _DNSRecordRef_t *DNSRecordRef;
+
+/* General flags used in functions defined below */
+enum
+ {
+ kDNSServiceFlagsMoreComing = 0x1,
+ /* MoreComing indicates to a callback that at least one more result is
+ * queued and will be delivered following immediately after this one.
+ * Applications should not update their UI to display browse
+ * results when the MoreComing flag is set, because this would
+ * result in a great deal of ugly flickering on the screen.
+ * Applications should instead wait until until MoreComing is not set,
+ * and then update their UI.
+ * When MoreComing is not set, that doesn't mean there will be no more
+ * answers EVER, just that there are no more answers immediately
+ * available right now at this instant. If more answers become available
+ * in the future they will be delivered as usual.
+ */
+
+ kDNSServiceFlagsAdd = 0x2,
+ kDNSServiceFlagsDefault = 0x4,
+ /* Flags for domain enumeration and browse/query reply callbacks.
+ * "Default" applies only to enumeration and is only valid in
+ * conjuction with "Add". An enumeration callback with the "Add"
+ * flag NOT set indicates a "Remove", i.e. the domain is no longer
+ * valid.
+ */
+
+ kDNSServiceFlagsNoAutoRename = 0x8,
+ /* Flag for specifying renaming behavior on name conflict when registering
+ * non-shared records. By default, name conflicts are automatically handled
+ * by renaming the service. NoAutoRename overrides this behavior - with this
+ * flag set, name conflicts will result in a callback. The NoAutorename flag
+ * is only valid if a name is explicitly specified when registering a service
+ * (i.e. the default name is not used.)
+ */
+
+ kDNSServiceFlagsShared = 0x10,
+ kDNSServiceFlagsUnique = 0x20,
+ /* Flag for registering individual records on a connected
+ * DNSServiceRef. Shared indicates that there may be multiple records
+ * with this name on the network (e.g. PTR records). Unique indicates that the
+ * record's name is to be unique on the network (e.g. SRV records).
+ */
+
+ kDNSServiceFlagsBrowseDomains = 0x40,
+ kDNSServiceFlagsRegistrationDomains = 0x80,
+ /* Flags for specifying domain enumeration type in DNSServiceEnumerateDomains.
+ * BrowseDomains enumerates domains recommended for browsing, RegistrationDomains
+ * enumerates domains recommended for registration.
+ */
+
+ kDNSServiceFlagsLongLivedQuery = 0x100,
+ /* Flag for creating a long-lived unicast query for the DNSServiceQueryRecord call. */
+
+ kDNSServiceFlagsAllowRemoteQuery = 0x200,
+ /* Flag for creating a record for which we will answer remote queries
+ * (queries from hosts more than one hop away; hosts not directly connected to the local link).
+ */
+
+ kDNSServiceFlagsForceMulticast = 0x400
+ /* Flag for signifying that a query or registration should be performed exclusively via multicast DNS,
+ * even for a name in a domain (e.g. foo.apple.com.) that would normally imply unicast DNS.
+ */
+ };
+
+/*
+ * The values for DNS Classes and Types are listed in RFC 1035, and are available
+ * on every OS in its DNS header file. Unfortunately every OS does not have the
+ * same header file containing DNS Class and Type constants, and the names of
+ * the constants are not consistent. For example, BIND 8 uses "T_A",
+ * BIND 9 uses "ns_t_a", Windows uses "DNS_TYPE_A", etc.
+ * For this reason, these constants are also listed here, so that code using
+ * the DNS-SD programming APIs can use these constants, so that the same code
+ * can compile on all our supported platforms.
+ */
+
+enum
+ {
+ kDNSServiceClass_IN = 1 /* Internet */
+ };
+
+enum
+ {
+ kDNSServiceType_A = 1, /* Host address. */
+ kDNSServiceType_NS = 2, /* Authoritative server. */
+ kDNSServiceType_MD = 3, /* Mail destination. */
+ kDNSServiceType_MF = 4, /* Mail forwarder. */
+ kDNSServiceType_CNAME = 5, /* Canonical name. */
+ kDNSServiceType_SOA = 6, /* Start of authority zone. */
+ kDNSServiceType_MB = 7, /* Mailbox domain name. */
+ kDNSServiceType_MG = 8, /* Mail group member. */
+ kDNSServiceType_MR = 9, /* Mail rename name. */
+ kDNSServiceType_NULL = 10, /* Null resource record. */
+ kDNSServiceType_WKS = 11, /* Well known service. */
+ kDNSServiceType_PTR = 12, /* Domain name pointer. */
+ kDNSServiceType_HINFO = 13, /* Host information. */
+ kDNSServiceType_MINFO = 14, /* Mailbox information. */
+ kDNSServiceType_MX = 15, /* Mail routing information. */
+ kDNSServiceType_TXT = 16, /* One or more text strings. */
+ kDNSServiceType_RP = 17, /* Responsible person. */
+ kDNSServiceType_AFSDB = 18, /* AFS cell database. */
+ kDNSServiceType_X25 = 19, /* X_25 calling address. */
+ kDNSServiceType_ISDN = 20, /* ISDN calling address. */
+ kDNSServiceType_RT = 21, /* Router. */
+ kDNSServiceType_NSAP = 22, /* NSAP address. */
+ kDNSServiceType_NSAP_PTR = 23, /* Reverse NSAP lookup (deprecated). */
+ kDNSServiceType_SIG = 24, /* Security signature. */
+ kDNSServiceType_KEY = 25, /* Security key. */
+ kDNSServiceType_PX = 26, /* X.400 mail mapping. */
+ kDNSServiceType_GPOS = 27, /* Geographical position (withdrawn). */
+ kDNSServiceType_AAAA = 28, /* Ip6 Address. */
+ kDNSServiceType_LOC = 29, /* Location Information. */
+ kDNSServiceType_NXT = 30, /* Next domain (security). */
+ kDNSServiceType_EID = 31, /* Endpoint identifier. */
+ kDNSServiceType_NIMLOC = 32, /* Nimrod Locator. */
+ kDNSServiceType_SRV = 33, /* Server Selection. */
+ kDNSServiceType_ATMA = 34, /* ATM Address */
+ kDNSServiceType_NAPTR = 35, /* Naming Authority PoinTeR */
+ kDNSServiceType_KX = 36, /* Key Exchange */
+ kDNSServiceType_CERT = 37, /* Certification record */
+ kDNSServiceType_A6 = 38, /* IPv6 address (deprecates AAAA) */
+ kDNSServiceType_DNAME = 39, /* Non-terminal DNAME (for IPv6) */
+ kDNSServiceType_SINK = 40, /* Kitchen sink (experimentatl) */
+ kDNSServiceType_OPT = 41, /* EDNS0 option (meta-RR) */
+ kDNSServiceType_TKEY = 249, /* Transaction key */
+ kDNSServiceType_TSIG = 250, /* Transaction signature. */
+ kDNSServiceType_IXFR = 251, /* Incremental zone transfer. */
+ kDNSServiceType_AXFR = 252, /* Transfer zone of authority. */
+ kDNSServiceType_MAILB = 253, /* Transfer mailbox records. */
+ kDNSServiceType_MAILA = 254, /* Transfer mail agent records. */
+ kDNSServiceType_ANY = 255 /* Wildcard match. */
+ };
+
+
+/* possible error code values */
+enum
+ {
+ kDNSServiceErr_NoError = 0,
+ kDNSServiceErr_Unknown = -65537, /* 0xFFFE FFFF */
+ kDNSServiceErr_NoSuchName = -65538,
+ kDNSServiceErr_NoMemory = -65539,
+ kDNSServiceErr_BadParam = -65540,
+ kDNSServiceErr_BadReference = -65541,
+ kDNSServiceErr_BadState = -65542,
+ kDNSServiceErr_BadFlags = -65543,
+ kDNSServiceErr_Unsupported = -65544,
+ kDNSServiceErr_NotInitialized = -65545,
+ kDNSServiceErr_AlreadyRegistered = -65547,
+ kDNSServiceErr_NameConflict = -65548,
+ kDNSServiceErr_Invalid = -65549,
+ kDNSServiceErr_Firewall = -65550,
+ kDNSServiceErr_Incompatible = -65551, /* client library incompatible with daemon */
+ kDNSServiceErr_BadInterfaceIndex = -65552,
+ kDNSServiceErr_Refused = -65553,
+ kDNSServiceErr_NoSuchRecord = -65554,
+ kDNSServiceErr_NoAuth = -65555,
+ kDNSServiceErr_NoSuchKey = -65556,
+ kDNSServiceErr_NATTraversal = -65557,
+ kDNSServiceErr_DoubleNAT = -65558,
+ kDNSServiceErr_BadTime = -65559
+ /* mDNS Error codes are in the range
+ * FFFE FF00 (-65792) to FFFE FFFF (-65537) */
+ };
+
+
+/* Maximum length, in bytes, of a service name represented as a */
+/* literal C-String, including the terminating NULL at the end. */
+
+#define kDNSServiceMaxServiceName 64
+
+/* Maximum length, in bytes, of a domain name represented as an *escaped* C-String */
+/* including the final trailing dot, and the C-String terminating NULL at the end. */
+
+#define kDNSServiceMaxDomainName 1005
+
+/*
+ * Notes on DNS Name Escaping
+ * -- or --
+ * "Why is kDNSServiceMaxDomainName 1005, when the maximum legal domain name is 255 bytes?"
+ *
+ * All strings used in DNS-SD are UTF-8 strings.
+ * With few exceptions, most are also escaped using standard DNS escaping rules:
+ *
+ * '\\' represents a single literal '\' in the name
+ * '\.' represents a single literal '.' in the name
+ * '\ddd', where ddd is a three-digit decimal value from 000 to 255,
+ * represents a single literal byte with that value.
+ * A bare unescaped '.' is a label separator, marking a boundary between domain and subdomain.
+ *
+ * The exceptions, that do not use escaping, are the routines where the full
+ * DNS name of a resource is broken, for convenience, into servicename/regtype/domain.
+ * In these routines, the "servicename" is NOT escaped. It does not need to be, since
+ * it is, by definition, just a single literal string. Any characters in that string
+ * represent exactly what they are. The "regtype" portion is, technically speaking,
+ * escaped, but since legal regtypes are only allowed to contain letters, digits,
+ * and hyphens, there is nothing to escape, so the issue is moot. The "domain"
+ * portion is also escaped, though most domains in use on the public Internet
+ * today, like regtypes, don't contain any characters that need to be escaped.
+ * As DNS-SD becomes more popular, rich-text domains for service discovery will
+ * become common, so software should be written to cope with domains with escaping.
+ *
+ * The servicename may be up to 63 bytes of UTF-8 text (not counting the C-String
+ * terminating NULL at the end). The regtype is of the form _service._tcp or
+ * _service._udp, where the "service" part is 1-14 characters, which may be
+ * letters, digits, or hyphens. The domain part of the three-part name may be
+ * any legal domain, providing that the resulting servicename+regtype+domain
+ * name does not exceed 255 bytes.
+ *
+ * For most software, these issues are transparent. When browsing, the discovered
+ * servicenames should simply be displayed as-is. When resolving, the discovered
+ * servicename/regtype/domain are simply passed unchanged to DNSServiceResolve().
+ * When a DNSServiceResolve() succeeds, the returned fullname is already in
+ * the correct format to pass to standard system DNS APIs such as res_query().
+ * For converting from servicename/regtype/domain to a single properly-escaped
+ * full DNS name, the helper function DNSServiceConstructFullName() is provided.
+ *
+ * The following (highly contrived) example illustrates the escaping process.
+ * Suppose you have an service called "Dr. Smith\Dr. Johnson", of type "_ftp._tcp"
+ * in subdomain "4th. Floor" of subdomain "Building 2" of domain "apple.com."
+ * The full (escaped) DNS name of this service's SRV record would be:
+ * Dr\.\032Smith\\Dr\.\032Johnson._ftp._tcp.4th\.\032Floor.Building\0322.apple.com.
+ */
+
+
+/*
+ * Constants for specifying an interface index
+ *
+ * Specific interface indexes are identified via a 32-bit unsigned integer returned
+ * by the if_nametoindex() family of calls.
+ *
+ * If the client passes 0 for interface index, that means "do the right thing",
+ * which (at present) means, "if the name is in an mDNS local multicast domain
+ * (e.g. 'local.', '254.169.in-addr.arpa.', '0.8.E.F.ip6.arpa.') then multicast
+ * on all applicable interfaces, otherwise send via unicast to the appropriate
+ * DNS server." Normally, most clients will use 0 for interface index to
+ * automatically get the default sensible behaviour.
+ *
+ * If the client passes a positive interface index, then for multicast names that
+ * indicates to do the operation only on that one interface. For unicast names the
+ * interface index is ignored unless kDNSServiceFlagsForceMulticast is also set.
+ *
+ * If the client passes kDNSServiceInterfaceIndexLocalOnly when registering
+ * a service, then that service will be found *only* by other local clients
+ * on the same machine that are browsing using kDNSServiceInterfaceIndexLocalOnly
+ * or kDNSServiceInterfaceIndexAny.
+ * If a client has a 'private' service, accessible only to other processes
+ * running on the same machine, this allows the client to advertise that service
+ * in a way such that it does not inadvertently appear in service lists on
+ * all the other machines on the network.
+ *
+ * If the client passes kDNSServiceInterfaceIndexLocalOnly when browsing
+ * then it will find *all* records registered on that same local machine.
+ * Clients explicitly wishing to discover *only* LocalOnly services can
+ * accomplish this by inspecting the interfaceIndex of each service reported
+ * to their DNSServiceBrowseReply() callback function, and discarding those
+ * where the interface index is not kDNSServiceInterfaceIndexLocalOnly.
+ */
+
+#define kDNSServiceInterfaceIndexAny 0
+#define kDNSServiceInterfaceIndexLocalOnly ( (uint32_t) -1 )
+
+
+typedef uint32_t DNSServiceFlags;
+typedef int32_t DNSServiceErrorType;
+
+
+/*********************************************************************************************
+ *
+ * Unix Domain Socket access, DNSServiceRef deallocation, and data processing functions
+ *
+ *********************************************************************************************/
+
+
+/* DNSServiceRefSockFD()
+ *
+ * Access underlying Unix domain socket for an initialized DNSServiceRef.
+ * The DNS Service Discovery implmementation uses this socket to communicate between
+ * the client and the mDNSResponder daemon. The application MUST NOT directly read from
+ * or write to this socket. Access to the socket is provided so that it can be used as a
+ * run loop source, or in a select() loop: when data is available for reading on the socket,
+ * DNSServiceProcessResult() should be called, which will extract the daemon's reply from
+ * the socket, and pass it to the appropriate application callback. By using a run loop or
+ * select(), results from the daemon can be processed asynchronously. Without using these
+ * constructs, DNSServiceProcessResult() will block until the response from the daemon arrives.
+ * The client is responsible for ensuring that the data on the socket is processed in a timely
+ * fashion - the daemon may terminate its connection with a client that does not clear its
+ * socket buffer.
+ *
+ * sdRef: A DNSServiceRef initialized by any of the DNSService calls.
+ *
+ * return value: The DNSServiceRef's underlying socket descriptor, or -1 on
+ * error.
+ */
+
+int DNSSD_API DNSServiceRefSockFD(DNSServiceRef sdRef);
+
+
+/* DNSServiceProcessResult()
+ *
+ * Read a reply from the daemon, calling the appropriate application callback. This call will
+ * block until the daemon's response is received. Use DNSServiceRefSockFD() in
+ * conjunction with a run loop or select() to determine the presence of a response from the
+ * server before calling this function to process the reply without blocking. Call this function
+ * at any point if it is acceptable to block until the daemon's response arrives. Note that the
+ * client is responsible for ensuring that DNSServiceProcessResult() is called whenever there is
+ * a reply from the daemon - the daemon may terminate its connection with a client that does not
+ * process the daemon's responses.
+ *
+ * sdRef: A DNSServiceRef initialized by any of the DNSService calls
+ * that take a callback parameter.
+ *
+ * return value: Returns kDNSServiceErr_NoError on success, otherwise returns
+ * an error code indicating the specific failure that occurred.
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceProcessResult(DNSServiceRef sdRef);
+
+
+/* DNSServiceRefDeallocate()
+ *
+ * Terminate a connection with the daemon and free memory associated with the DNSServiceRef.
+ * Any services or records registered with this DNSServiceRef will be deregistered. Any
+ * Browse, Resolve, or Query operations called with this reference will be terminated.
+ *
+ * Note: If the reference's underlying socket is used in a run loop or select() call, it should
+ * be removed BEFORE DNSServiceRefDeallocate() is called, as this function closes the reference's
+ * socket.
+ *
+ * Note: If the reference was initialized with DNSServiceCreateConnection(), any DNSRecordRefs
+ * created via this reference will be invalidated by this call - the resource records are
+ * deregistered, and their DNSRecordRefs may not be used in subsequent functions. Similarly,
+ * if the reference was initialized with DNSServiceRegister, and an extra resource record was
+ * added to the service via DNSServiceAddRecord(), the DNSRecordRef created by the Add() call
+ * is invalidated when this function is called - the DNSRecordRef may not be used in subsequent
+ * functions.
+ *
+ * Note: This call is to be used only with the DNSServiceRef defined by this API. It is
+ * not compatible with dns_service_discovery_ref objects defined in the legacy Mach-based
+ * DNSServiceDiscovery.h API.
+ *
+ * sdRef: A DNSServiceRef initialized by any of the DNSService calls.
+ *
+ */
+
+void DNSSD_API DNSServiceRefDeallocate(DNSServiceRef sdRef);
+
+
+/*********************************************************************************************
+ *
+ * Domain Enumeration
+ *
+ *********************************************************************************************/
+
+/* DNSServiceEnumerateDomains()
+ *
+ * Asynchronously enumerate domains available for browsing and registration.
+ *
+ * The enumeration MUST be cancelled via DNSServiceRefDeallocate() when no more domains
+ * are to be found.
+ *
+ * Note that the names returned are (like all of DNS-SD) UTF-8 strings,
+ * and are escaped using standard DNS escaping rules.
+ * (See "Notes on DNS Name Escaping" earlier in this file for more details.)
+ * A graphical browser displaying a hierarchical tree-structured view should cut
+ * the names at the bare dots to yield individual labels, then de-escape each
+ * label according to the escaping rules, and then display the resulting UTF-8 text.
+ *
+ * DNSServiceDomainEnumReply Callback Parameters:
+ *
+ * sdRef: The DNSServiceRef initialized by DNSServiceEnumerateDomains().
+ *
+ * flags: Possible values are:
+ * kDNSServiceFlagsMoreComing
+ * kDNSServiceFlagsAdd
+ * kDNSServiceFlagsDefault
+ *
+ * interfaceIndex: Specifies the interface on which the domain exists. (The index for a given
+ * interface is determined via the if_nametoindex() family of calls.)
+ *
+ * errorCode: Will be kDNSServiceErr_NoError (0) on success, otherwise indicates
+ * the failure that occurred (other parameters are undefined if errorCode is nonzero).
+ *
+ * replyDomain: The name of the domain.
+ *
+ * context: The context pointer passed to DNSServiceEnumerateDomains.
+ *
+ */
+
+typedef void (DNSSD_API *DNSServiceDomainEnumReply)
+ (
+ DNSServiceRef sdRef,
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ DNSServiceErrorType errorCode,
+ const char *replyDomain,
+ void *context
+ );
+
+
+/* DNSServiceEnumerateDomains() Parameters:
+ *
+ *
+ * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds
+ * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
+ * and the enumeration operation will run indefinitely until the client
+ * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
+ *
+ * flags: Possible values are:
+ * kDNSServiceFlagsBrowseDomains to enumerate domains recommended for browsing.
+ * kDNSServiceFlagsRegistrationDomains to enumerate domains recommended
+ * for registration.
+ *
+ * interfaceIndex: If non-zero, specifies the interface on which to look for domains.
+ * (the index for a given interface is determined via the if_nametoindex()
+ * family of calls.) Most applications will pass 0 to enumerate domains on
+ * all interfaces. See "Constants for specifying an interface index" for more details.
+ *
+ * callBack: The function to be called when a domain is found or the call asynchronously
+ * fails.
+ *
+ * context: An application context pointer which is passed to the callback function
+ * (may be NULL).
+ *
+ * return value: Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ * errors are delivered to the callback), otherwise returns an error code indicating
+ * the error that occurred (the callback is not invoked and the DNSServiceRef
+ * is not initialized.)
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceEnumerateDomains
+ (
+ DNSServiceRef *sdRef,
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ DNSServiceDomainEnumReply callBack,
+ void *context /* may be NULL */
+ );
+
+
+/*********************************************************************************************
+ *
+ * Service Registration
+ *
+ *********************************************************************************************/
+
+/* Register a service that is discovered via Browse() and Resolve() calls.
+ *
+ *
+ * DNSServiceRegisterReply() Callback Parameters:
+ *
+ * sdRef: The DNSServiceRef initialized by DNSServiceRegister().
+ *
+ * flags: Currently unused, reserved for future use.
+ *
+ * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will
+ * indicate the failure that occurred (including name conflicts,
+ * if the kDNSServiceFlagsNoAutoRename flag was used when registering.)
+ * Other parameters are undefined if errorCode is nonzero.
+ *
+ * name: The service name registered (if the application did not specify a name in
+ * DNSServiceRegister(), this indicates what name was automatically chosen).
+ *
+ * regtype: The type of service registered, as it was passed to the callout.
+ *
+ * domain: The domain on which the service was registered (if the application did not
+ * specify a domain in DNSServiceRegister(), this indicates the default domain
+ * on which the service was registered).
+ *
+ * context: The context pointer that was passed to the callout.
+ *
+ */
+
+typedef void (DNSSD_API *DNSServiceRegisterReply)
+ (
+ DNSServiceRef sdRef,
+ DNSServiceFlags flags,
+ DNSServiceErrorType errorCode,
+ const char *name,
+ const char *regtype,
+ const char *domain,
+ void *context
+ );
+
+
+/* DNSServiceRegister() Parameters:
+ *
+ * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds
+ * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
+ * and the registration will remain active indefinitely until the client
+ * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
+ *
+ * interfaceIndex: If non-zero, specifies the interface on which to register the service
+ * (the index for a given interface is determined via the if_nametoindex()
+ * family of calls.) Most applications will pass 0 to register on all
+ * available interfaces. See "Constants for specifying an interface index" for more details.
+ *
+ * flags: Indicates the renaming behavior on name conflict (most applications
+ * will pass 0). See flag definitions above for details.
+ *
+ * name: If non-NULL, specifies the service name to be registered.
+ * Most applications will not specify a name, in which case the computer
+ * name is used (this name is communicated to the client via the callback).
+ * If a name is specified, it must be 1-63 bytes of UTF-8 text.
+ * If the name is longer than 63 bytes it will be automatically truncated
+ * to a legal length, unless the NoAutoRename flag is set,
+ * in which case kDNSServiceErr_BadParam will be returned.
+ *
+ * regtype: The service type followed by the protocol, separated by a dot
+ * (e.g. "_ftp._tcp"). The service type must be an underscore, followed
+ * by 1-14 characters, which may be letters, digits, or hyphens.
+ * The transport protocol must be "_tcp" or "_udp". New service types
+ * should be registered at <http://www.dns-sd.org/ServiceTypes.html>.
+ *
+ * domain: If non-NULL, specifies the domain on which to advertise the service.
+ * Most applications will not specify a domain, instead automatically
+ * registering in the default domain(s).
+ *
+ * host: If non-NULL, specifies the SRV target host name. Most applications
+ * will not specify a host, instead automatically using the machine's
+ * default host name(s). Note that specifying a non-NULL host does NOT
+ * create an address record for that host - the application is responsible
+ * for ensuring that the appropriate address record exists, or creating it
+ * via DNSServiceRegisterRecord().
+ *
+ * port: The port, in network byte order, on which the service accepts connections.
+ * Pass 0 for a "placeholder" service (i.e. a service that will not be discovered
+ * by browsing, but will cause a name conflict if another client tries to
+ * register that same name). Most clients will not use placeholder services.
+ *
+ * txtLen: The length of the txtRecord, in bytes. Must be zero if the txtRecord is NULL.
+ *
+ * txtRecord: The TXT record rdata. A non-NULL txtRecord MUST be a properly formatted DNS
+ * TXT record, i.e. <length byte> <data> <length byte> <data> ...
+ * Passing NULL for the txtRecord is allowed as a synonym for txtLen=1, txtRecord="",
+ * i.e. it creates a TXT record of length one containing a single empty string.
+ * RFC 1035 doesn't allow a TXT record to contain *zero* strings, so a single empty
+ * string is the smallest legal DNS TXT record.
+ *
+ * callBack: The function to be called when the registration completes or asynchronously
+ * fails. The client MAY pass NULL for the callback - The client will NOT be notified
+ * of the default values picked on its behalf, and the client will NOT be notified of any
+ * asynchronous errors (e.g. out of memory errors, etc.) that may prevent the registration
+ * of the service. The client may NOT pass the NoAutoRename flag if the callback is NULL.
+ * The client may still deregister the service at any time via DNSServiceRefDeallocate().
+ *
+ * context: An application context pointer which is passed to the callback function
+ * (may be NULL).
+ *
+ * return value: Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ * errors are delivered to the callback), otherwise returns an error code indicating
+ * the error that occurred (the callback is never invoked and the DNSServiceRef
+ * is not initialized.)
+ *
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceRegister
+ (
+ DNSServiceRef *sdRef,
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ const char *name, /* may be NULL */
+ const char *regtype,
+ const char *domain, /* may be NULL */
+ const char *host, /* may be NULL */
+ uint16_t port,
+ uint16_t txtLen,
+ const void *txtRecord, /* may be NULL */
+ DNSServiceRegisterReply callBack, /* may be NULL */
+ void *context /* may be NULL */
+ );
+
+
+/* DNSServiceAddRecord()
+ *
+ * Add a record to a registered service. The name of the record will be the same as the
+ * registered service's name.
+ * The record can later be updated or deregistered by passing the RecordRef initialized
+ * by this function to DNSServiceUpdateRecord() or DNSServiceRemoveRecord().
+ *
+ *
+ * Parameters;
+ *
+ * sdRef: A DNSServiceRef initialized by DNSServiceRegister().
+ *
+ * RecordRef: A pointer to an uninitialized DNSRecordRef. Upon succesfull completion of this
+ * call, this ref may be passed to DNSServiceUpdateRecord() or DNSServiceRemoveRecord().
+ * If the above DNSServiceRef is passed to DNSServiceRefDeallocate(), RecordRef is also
+ * invalidated and may not be used further.
+ *
+ * flags: Currently ignored, reserved for future use.
+ *
+ * rrtype: The type of the record (e.g. kDNSServiceType_TXT, kDNSServiceType_SRV, etc)
+ *
+ * rdlen: The length, in bytes, of the rdata.
+ *
+ * rdata: The raw rdata to be contained in the added resource record.
+ *
+ * ttl: The time to live of the resource record, in seconds. Pass 0 to use a default value.
+ *
+ * return value: Returns kDNSServiceErr_NoError on success, otherwise returns an
+ * error code indicating the error that occurred (the RecordRef is not initialized).
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceAddRecord
+ (
+ DNSServiceRef sdRef,
+ DNSRecordRef *RecordRef,
+ DNSServiceFlags flags,
+ uint16_t rrtype,
+ uint16_t rdlen,
+ const void *rdata,
+ uint32_t ttl
+ );
+
+
+/* DNSServiceUpdateRecord
+ *
+ * Update a registered resource record. The record must either be:
+ * - The primary txt record of a service registered via DNSServiceRegister()
+ * - A record added to a registered service via DNSServiceAddRecord()
+ * - An individual record registered by DNSServiceRegisterRecord()
+ *
+ *
+ * Parameters:
+ *
+ * sdRef: A DNSServiceRef that was initialized by DNSServiceRegister()
+ * or DNSServiceCreateConnection().
+ *
+ * RecordRef: A DNSRecordRef initialized by DNSServiceAddRecord, or NULL to update the
+ * service's primary txt record.
+ *
+ * flags: Currently ignored, reserved for future use.
+ *
+ * rdlen: The length, in bytes, of the new rdata.
+ *
+ * rdata: The new rdata to be contained in the updated resource record.
+ *
+ * ttl: The time to live of the updated resource record, in seconds.
+ *
+ * return value: Returns kDNSServiceErr_NoError on success, otherwise returns an
+ * error code indicating the error that occurred.
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceUpdateRecord
+ (
+ DNSServiceRef sdRef,
+ DNSRecordRef RecordRef, /* may be NULL */
+ DNSServiceFlags flags,
+ uint16_t rdlen,
+ const void *rdata,
+ uint32_t ttl
+ );
+
+
+/* DNSServiceRemoveRecord
+ *
+ * Remove a record previously added to a service record set via DNSServiceAddRecord(), or deregister
+ * an record registered individually via DNSServiceRegisterRecord().
+ *
+ * Parameters:
+ *
+ * sdRef: A DNSServiceRef initialized by DNSServiceRegister() (if the
+ * record being removed was registered via DNSServiceAddRecord()) or by
+ * DNSServiceCreateConnection() (if the record being removed was registered via
+ * DNSServiceRegisterRecord()).
+ *
+ * recordRef: A DNSRecordRef initialized by a successful call to DNSServiceAddRecord()
+ * or DNSServiceRegisterRecord().
+ *
+ * flags: Currently ignored, reserved for future use.
+ *
+ * return value: Returns kDNSServiceErr_NoError on success, otherwise returns an
+ * error code indicating the error that occurred.
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceRemoveRecord
+ (
+ DNSServiceRef sdRef,
+ DNSRecordRef RecordRef,
+ DNSServiceFlags flags
+ );
+
+
+/*********************************************************************************************
+ *
+ * Service Discovery
+ *
+ *********************************************************************************************/
+
+/* Browse for instances of a service.
+ *
+ *
+ * DNSServiceBrowseReply() Parameters:
+ *
+ * sdRef: The DNSServiceRef initialized by DNSServiceBrowse().
+ *
+ * flags: Possible values are kDNSServiceFlagsMoreComing and kDNSServiceFlagsAdd.
+ * See flag definitions for details.
+ *
+ * interfaceIndex: The interface on which the service is advertised. This index should
+ * be passed to DNSServiceResolve() when resolving the service.
+ *
+ * errorCode: Will be kDNSServiceErr_NoError (0) on success, otherwise will
+ * indicate the failure that occurred. Other parameters are undefined if
+ * the errorCode is nonzero.
+ *
+ * serviceName: The discovered service name. This name should be displayed to the user,
+ * and stored for subsequent use in the DNSServiceResolve() call.
+ *
+ * regtype: The service type, which is usually (but not always) the same as was passed
+ * to DNSServiceBrowse(). One case where the discovered service type may
+ * not be the same as the requested service type is when using subtypes:
+ * The client may want to browse for only those ftp servers that allow
+ * anonymous connections. The client will pass the string "_ftp._tcp,_anon"
+ * to DNSServiceBrowse(), but the type of the service that's discovered
+ * is simply "_ftp._tcp". The regtype for each discovered service instance
+ * should be stored along with the name, so that it can be passed to
+ * DNSServiceResolve() when the service is later resolved.
+ *
+ * domain: The domain of the discovered service instance. This may or may not be the
+ * same as the domain that was passed to DNSServiceBrowse(). The domain for each
+ * discovered service instance should be stored along with the name, so that
+ * it can be passed to DNSServiceResolve() when the service is later resolved.
+ *
+ * context: The context pointer that was passed to the callout.
+ *
+ */
+
+typedef void (DNSSD_API *DNSServiceBrowseReply)
+ (
+ DNSServiceRef sdRef,
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ DNSServiceErrorType errorCode,
+ const char *serviceName,
+ const char *regtype,
+ const char *replyDomain,
+ void *context
+ );
+
+
+/* DNSServiceBrowse() Parameters:
+ *
+ * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds
+ * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
+ * and the browse operation will run indefinitely until the client
+ * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
+ *
+ * flags: Currently ignored, reserved for future use.
+ *
+ * interfaceIndex: If non-zero, specifies the interface on which to browse for services
+ * (the index for a given interface is determined via the if_nametoindex()
+ * family of calls.) Most applications will pass 0 to browse on all available
+ * interfaces. See "Constants for specifying an interface index" for more details.
+ *
+ * regtype: The service type being browsed for followed by the protocol, separated by a
+ * dot (e.g. "_ftp._tcp"). The transport protocol must be "_tcp" or "_udp".
+ *
+ * domain: If non-NULL, specifies the domain on which to browse for services.
+ * Most applications will not specify a domain, instead browsing on the
+ * default domain(s).
+ *
+ * callBack: The function to be called when an instance of the service being browsed for
+ * is found, or if the call asynchronously fails.
+ *
+ * context: An application context pointer which is passed to the callback function
+ * (may be NULL).
+ *
+ * return value: Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ * errors are delivered to the callback), otherwise returns an error code indicating
+ * the error that occurred (the callback is not invoked and the DNSServiceRef
+ * is not initialized.)
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceBrowse
+ (
+ DNSServiceRef *sdRef,
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ const char *regtype,
+ const char *domain, /* may be NULL */
+ DNSServiceBrowseReply callBack,
+ void *context /* may be NULL */
+ );
+
+
+/* DNSServiceResolve()
+ *
+ * Resolve a service name discovered via DNSServiceBrowse() to a target host name, port number, and
+ * txt record.
+ *
+ * Note: Applications should NOT use DNSServiceResolve() solely for txt record monitoring - use
+ * DNSServiceQueryRecord() instead, as it is more efficient for this task.
+ *
+ * Note: When the desired results have been returned, the client MUST terminate the resolve by calling
+ * DNSServiceRefDeallocate().
+ *
+ * Note: DNSServiceResolve() behaves correctly for typical services that have a single SRV record
+ * and a single TXT record. To resolve non-standard services with multiple SRV or TXT records,
+ * DNSServiceQueryRecord() should be used.
+ *
+ * DNSServiceResolveReply Callback Parameters:
+ *
+ * sdRef: The DNSServiceRef initialized by DNSServiceResolve().
+ *
+ * flags: Currently unused, reserved for future use.
+ *
+ * interfaceIndex: The interface on which the service was resolved.
+ *
+ * errorCode: Will be kDNSServiceErr_NoError (0) on success, otherwise will
+ * indicate the failure that occurred. Other parameters are undefined if
+ * the errorCode is nonzero.
+ *
+ * fullname: The full service domain name, in the form <servicename>.<protocol>.<domain>.
+ * (This name is escaped following standard DNS rules, making it suitable for
+ * passing to standard system DNS APIs such as res_query(), or to the
+ * special-purpose functions included in this API that take fullname parameters.
+ * See "Notes on DNS Name Escaping" earlier in this file for more details.)
+ *
+ * hosttarget: The target hostname of the machine providing the service. This name can
+ * be passed to functions like gethostbyname() to identify the host's IP address.
+ *
+ * port: The port, in network byte order, on which connections are accepted for this service.
+ *
+ * txtLen: The length of the txt record, in bytes.
+ *
+ * txtRecord: The service's primary txt record, in standard txt record format.
+ *
+
+ * context: The context pointer that was passed to the callout.
+ *
+ */
+
+typedef void (DNSSD_API *DNSServiceResolveReply)
+ (
+ DNSServiceRef sdRef,
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ DNSServiceErrorType errorCode,
+ const char *fullname,
+ const char *hosttarget,
+ uint16_t port,
+ uint16_t txtLen,
+ const char *txtRecord,
+ void *context
+ );
+
+
+/* DNSServiceResolve() Parameters
+ *
+ * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds
+ * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
+ * and the resolve operation will run indefinitely until the client
+ * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
+ *
+ * flags: Currently ignored, reserved for future use.
+ *
+ * interfaceIndex: The interface on which to resolve the service. If this resolve call is
+ * as a result of a currently active DNSServiceBrowse() operation, then the
+ * interfaceIndex should be the index reported in the DNSServiceBrowseReply
+ * callback. If this resolve call is using information previously saved
+ * (e.g. in a preference file) for later use, then use interfaceIndex 0, because
+ * the desired service may now be reachable via a different physical interface.
+ * See "Constants for specifying an interface index" for more details.
+ *
+ * name: The name of the service instance to be resolved, as reported to the
+ * DNSServiceBrowseReply() callback.
+ *
+ * regtype: The type of the service instance to be resolved, as reported to the
+ * DNSServiceBrowseReply() callback.
+ *
+ * domain: The domain of the service instance to be resolved, as reported to the
+ * DNSServiceBrowseReply() callback.
+ *
+ * callBack: The function to be called when a result is found, or if the call
+ * asynchronously fails.
+ *
+ * context: An application context pointer which is passed to the callback function
+ * (may be NULL).
+ *
+ * return value: Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ * errors are delivered to the callback), otherwise returns an error code indicating
+ * the error that occurred (the callback is never invoked and the DNSServiceRef
+ * is not initialized.)
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceResolve
+ (
+ DNSServiceRef *sdRef,
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ const char *name,
+ const char *regtype,
+ const char *domain,
+ DNSServiceResolveReply callBack,
+ void *context /* may be NULL */
+ );
+
+
+/*********************************************************************************************
+ *
+ * Special Purpose Calls (most applications will not use these)
+ *
+ *********************************************************************************************/
+
+/* DNSServiceCreateConnection()
+ *
+ * Create a connection to the daemon allowing efficient registration of
+ * multiple individual records.
+ *
+ *
+ * Parameters:
+ *
+ * sdRef: A pointer to an uninitialized DNSServiceRef. Deallocating
+ * the reference (via DNSServiceRefDeallocate()) severs the
+ * connection and deregisters all records registered on this connection.
+ *
+ * return value: Returns kDNSServiceErr_NoError on success, otherwise returns
+ * an error code indicating the specific failure that occurred (in which
+ * case the DNSServiceRef is not initialized).
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceCreateConnection(DNSServiceRef *sdRef);
+
+
+/* DNSServiceRegisterRecord
+ *
+ * Register an individual resource record on a connected DNSServiceRef.
+ *
+ * Note that name conflicts occurring for records registered via this call must be handled
+ * by the client in the callback.
+ *
+ *
+ * DNSServiceRegisterRecordReply() parameters:
+ *
+ * sdRef: The connected DNSServiceRef initialized by
+ * DNSServiceDiscoveryConnect().
+ *
+ * RecordRef: The DNSRecordRef initialized by DNSServiceRegisterRecord(). If the above
+ * DNSServiceRef is passed to DNSServiceRefDeallocate(), this DNSRecordRef is
+ * invalidated, and may not be used further.
+ *
+ * flags: Currently unused, reserved for future use.
+ *
+ * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will
+ * indicate the failure that occurred (including name conflicts.)
+ * Other parameters are undefined if errorCode is nonzero.
+ *
+ * context: The context pointer that was passed to the callout.
+ *
+ */
+
+ typedef void (DNSSD_API *DNSServiceRegisterRecordReply)
+ (
+ DNSServiceRef sdRef,
+ DNSRecordRef RecordRef,
+ DNSServiceFlags flags,
+ DNSServiceErrorType errorCode,
+ void *context
+ );
+
+
+/* DNSServiceRegisterRecord() Parameters:
+ *
+ * sdRef: A DNSServiceRef initialized by DNSServiceCreateConnection().
+ *
+ * RecordRef: A pointer to an uninitialized DNSRecordRef. Upon succesfull completion of this
+ * call, this ref may be passed to DNSServiceUpdateRecord() or DNSServiceRemoveRecord().
+ * (To deregister ALL records registered on a single connected DNSServiceRef
+ * and deallocate each of their corresponding DNSServiceRecordRefs, call
+ * DNSServiceRefDealloocate()).
+ *
+ * flags: Possible values are kDNSServiceFlagsShared or kDNSServiceFlagsUnique
+ * (see flag type definitions for details).
+ *
+ * interfaceIndex: If non-zero, specifies the interface on which to register the record
+ * (the index for a given interface is determined via the if_nametoindex()
+ * family of calls.) Passing 0 causes the record to be registered on all interfaces.
+ * See "Constants for specifying an interface index" for more details.
+ *
+ * fullname: The full domain name of the resource record.
+ *
+ * rrtype: The numerical type of the resource record (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
+ *
+ * rrclass: The class of the resource record (usually kDNSServiceClass_IN)
+ *
+ * rdlen: Length, in bytes, of the rdata.
+ *
+ * rdata: A pointer to the raw rdata, as it is to appear in the DNS record.
+ *
+ * ttl: The time to live of the resource record, in seconds. Pass 0 to use a default value.
+ *
+ * callBack: The function to be called when a result is found, or if the call
+ * asynchronously fails (e.g. because of a name conflict.)
+ *
+ * context: An application context pointer which is passed to the callback function
+ * (may be NULL).
+ *
+ * return value: Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ * errors are delivered to the callback), otherwise returns an error code indicating
+ * the error that occurred (the callback is never invoked and the DNSRecordRef is
+ * not initialized.)
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceRegisterRecord
+ (
+ DNSServiceRef sdRef,
+ DNSRecordRef *RecordRef,
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ const char *fullname,
+ uint16_t rrtype,
+ uint16_t rrclass,
+ uint16_t rdlen,
+ const void *rdata,
+ uint32_t ttl,
+ DNSServiceRegisterRecordReply callBack,
+ void *context /* may be NULL */
+ );
+
+
+/* DNSServiceQueryRecord
+ *
+ * Query for an arbitrary DNS record.
+ *
+ *
+ * DNSServiceQueryRecordReply() Callback Parameters:
+ *
+ * sdRef: The DNSServiceRef initialized by DNSServiceQueryRecord().
+ *
+ * flags: Possible values are kDNSServiceFlagsMoreComing and
+ * kDNSServiceFlagsAdd. The Add flag is NOT set for PTR records
+ * with a ttl of 0, i.e. "Remove" events.
+ *
+ * interfaceIndex: The interface on which the query was resolved (the index for a given
+ * interface is determined via the if_nametoindex() family of calls).
+ * See "Constants for specifying an interface index" for more details.
+ *
+ * errorCode: Will be kDNSServiceErr_NoError on success, otherwise will
+ * indicate the failure that occurred. Other parameters are undefined if
+ * errorCode is nonzero.
+ *
+ * fullname: The resource record's full domain name.
+ *
+ * rrtype: The resource record's type (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
+ *
+ * rrclass: The class of the resource record (usually kDNSServiceClass_IN).
+ *
+ * rdlen: The length, in bytes, of the resource record rdata.
+ *
+ * rdata: The raw rdata of the resource record.
+ *
+ * ttl: The resource record's time to live, in seconds.
+ *
+ * context: The context pointer that was passed to the callout.
+ *
+ */
+
+typedef void (DNSSD_API *DNSServiceQueryRecordReply)
+ (
+ DNSServiceRef DNSServiceRef,
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ DNSServiceErrorType errorCode,
+ const char *fullname,
+ uint16_t rrtype,
+ uint16_t rrclass,
+ uint16_t rdlen,
+ const void *rdata,
+ uint32_t ttl,
+ void *context
+ );
+
+
+/* DNSServiceQueryRecord() Parameters:
+ *
+ * sdRef: A pointer to an uninitialized DNSServiceRef. If the call succeeds
+ * then it initializes the DNSServiceRef, returns kDNSServiceErr_NoError,
+ * and the query operation will run indefinitely until the client
+ * terminates it by passing this DNSServiceRef to DNSServiceRefDeallocate().
+ *
+ * flags: Pass kDNSServiceFlagsLongLivedQuery to create a "long-lived" unicast
+ * query in a non-local domain. Without setting this flag, unicast queries
+ * will be one-shot - that is, only answers available at the time of the call
+ * will be returned. By setting this flag, answers (including Add and Remove
+ * events) that become available after the initial call is made will generate
+ * callbacks. This flag has no effect on link-local multicast queries.
+ *
+ * interfaceIndex: If non-zero, specifies the interface on which to issue the query
+ * (the index for a given interface is determined via the if_nametoindex()
+ * family of calls.) Passing 0 causes the name to be queried for on all
+ * interfaces. See "Constants for specifying an interface index" for more details.
+ *
+ * fullname: The full domain name of the resource record to be queried for.
+ *
+ * rrtype: The numerical type of the resource record to be queried for
+ * (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
+ *
+ * rrclass: The class of the resource record (usually kDNSServiceClass_IN).
+ *
+ * callBack: The function to be called when a result is found, or if the call
+ * asynchronously fails.
+ *
+ * context: An application context pointer which is passed to the callback function
+ * (may be NULL).
+ *
+ * return value: Returns kDNSServiceErr_NoError on succeses (any subsequent, asynchronous
+ * errors are delivered to the callback), otherwise returns an error code indicating
+ * the error that occurred (the callback is never invoked and the DNSServiceRef
+ * is not initialized.)
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceQueryRecord
+ (
+ DNSServiceRef *sdRef,
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ const char *fullname,
+ uint16_t rrtype,
+ uint16_t rrclass,
+ DNSServiceQueryRecordReply callBack,
+ void *context /* may be NULL */
+ );
+
+
+/* DNSServiceReconfirmRecord
+ *
+ * Instruct the daemon to verify the validity of a resource record that appears to
+ * be out of date (e.g. because tcp connection to a service's target failed.)
+ * Causes the record to be flushed from the daemon's cache (as well as all other
+ * daemons' caches on the network) if the record is determined to be invalid.
+ *
+ * Parameters:
+ *
+ * flags: Currently unused, reserved for future use.
+ *
+ * interfaceIndex: If non-zero, specifies the interface of the record in question.
+ * Passing 0 causes all instances of this record to be reconfirmed.
+ *
+ * fullname: The resource record's full domain name.
+ *
+ * rrtype: The resource record's type (e.g. kDNSServiceType_PTR, kDNSServiceType_SRV, etc)
+ *
+ * rrclass: The class of the resource record (usually kDNSServiceClass_IN).
+ *
+ * rdlen: The length, in bytes, of the resource record rdata.
+ *
+ * rdata: The raw rdata of the resource record.
+ *
+ */
+
+void DNSSD_API DNSServiceReconfirmRecord
+ (
+ DNSServiceFlags flags,
+ uint32_t interfaceIndex,
+ const char *fullname,
+ uint16_t rrtype,
+ uint16_t rrclass,
+ uint16_t rdlen,
+ const void *rdata
+ );
+
+
+/*********************************************************************************************
+ *
+ * General Utility Functions
+ *
+ *********************************************************************************************/
+
+/* DNSServiceConstructFullName()
+ *
+ * Concatenate a three-part domain name (as returned by the above callbacks) into a
+ * properly-escaped full domain name. Note that callbacks in the above functions ALREADY ESCAPE
+ * strings where necessary.
+ *
+ * Parameters:
+ *
+ * fullName: A pointer to a buffer that where the resulting full domain name is to be written.
+ * The buffer must be kDNSServiceMaxDomainName (1005) bytes in length to
+ * accommodate the longest legal domain name without buffer overrun.
+ *
+ * service: The service name - any dots or backslashes must NOT be escaped.
+ * May be NULL (to construct a PTR record name, e.g.
+ * "_ftp._tcp.apple.com.").
+ *
+ * regtype: The service type followed by the protocol, separated by a dot
+ * (e.g. "_ftp._tcp").
+ *
+ * domain: The domain name, e.g. "apple.com.". Literal dots or backslashes,
+ * if any, must be escaped, e.g. "1st\. Floor.apple.com."
+ *
+ * return value: Returns 0 on success, -1 on error.
+ *
+ */
+
+int DNSSD_API DNSServiceConstructFullName
+ (
+ char *fullName,
+ const char *service, /* may be NULL */
+ const char *regtype,
+ const char *domain
+ );
+
+
+/*********************************************************************************************
+ *
+ * TXT Record Construction Functions
+ *
+ *********************************************************************************************/
+
+/*
+ * A typical calling sequence for TXT record construction is something like:
+ *
+ * Client allocates storage for TXTRecord data (e.g. declare buffer on the stack)
+ * TXTRecordCreate();
+ * TXTRecordSetValue();
+ * TXTRecordSetValue();
+ * TXTRecordSetValue();
+ * ...
+ * DNSServiceRegister( ... TXTRecordGetLength(), TXTRecordGetBytesPtr() ... );
+ * TXTRecordDeallocate();
+ * Explicitly deallocate storage for TXTRecord data (if not allocated on the stack)
+ */
+
+
+/* TXTRecordRef
+ *
+ * Opaque internal data type.
+ * Note: Represents a DNS-SD TXT record.
+ */
+
+typedef struct _TXTRecordRef_t { char privatedata[16]; } TXTRecordRef;
+
+
+/* TXTRecordCreate()
+ *
+ * Creates a new empty TXTRecordRef referencing the specified storage.
+ *
+ * If the buffer parameter is NULL, or the specified storage size is not
+ * large enough to hold a key subsequently added using TXTRecordSetValue(),
+ * then additional memory will be added as needed using malloc().
+ *
+ * On some platforms, when memory is low, malloc() may fail. In this
+ * case, TXTRecordSetValue() will return kDNSServiceErr_NoMemory, and this
+ * error condition will need to be handled as appropriate by the caller.
+ *
+ * You can avoid the need to handle this error condition if you ensure
+ * that the storage you initially provide is large enough to hold all
+ * the key/value pairs that are to be added to the record.
+ * The caller can precompute the exact length required for all of the
+ * key/value pairs to be added, or simply provide a fixed-sized buffer
+ * known in advance to be large enough.
+ * A no-value (key-only) key requires (1 + key length) bytes.
+ * A key with empty value requires (1 + key length + 1) bytes.
+ * A key with non-empty value requires (1 + key length + 1 + value length).
+ * For most applications, DNS-SD TXT records are generally
+ * less than 100 bytes, so in most cases a simple fixed-sized
+ * 256-byte buffer will be more than sufficient.
+ * Recommended size limits for DNS-SD TXT Records are discussed in
+ * <http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt>
+ *
+ * Note: When passing parameters to and from these TXT record APIs,
+ * the key name does not include the '=' character. The '=' character
+ * is the separator between the key and value in the on-the-wire
+ * packet format; it is not part of either the key or the value.
+ *
+ * txtRecord: A pointer to an uninitialized TXTRecordRef.
+ *
+ * bufferLen: The size of the storage provided in the "buffer" parameter.
+ *
+ * buffer: Optional caller-supplied storage used to hold the TXTRecord data.
+ * This storage must remain valid for as long as
+ * the TXTRecordRef.
+ */
+
+void DNSSD_API TXTRecordCreate
+ (
+ TXTRecordRef *txtRecord,
+ uint16_t bufferLen,
+ void *buffer
+ );
+
+
+/* TXTRecordDeallocate()
+ *
+ * Releases any resources allocated in the course of preparing a TXT Record
+ * using TXTRecordCreate()/TXTRecordSetValue()/TXTRecordRemoveValue().
+ * Ownership of the buffer provided in TXTRecordCreate() returns to the client.
+ *
+ * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate().
+ *
+ */
+
+void DNSSD_API TXTRecordDeallocate
+ (
+ TXTRecordRef *txtRecord
+ );
+
+
+/* TXTRecordSetValue()
+ *
+ * Adds a key (optionally with value) to a TXTRecordRef. If the "key" already
+ * exists in the TXTRecordRef, then the current value will be replaced with
+ * the new value.
+ * Keys may exist in four states with respect to a given TXT record:
+ * - Absent (key does not appear at all)
+ * - Present with no value ("key" appears alone)
+ * - Present with empty value ("key=" appears in TXT record)
+ * - Present with non-empty value ("key=value" appears in TXT record)
+ * For more details refer to "Data Syntax for DNS-SD TXT Records" in
+ * <http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt>
+ *
+ * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate().
+ *
+ * key: A null-terminated string which only contains printable ASCII
+ * values (0x20-0x7E), excluding '=' (0x3D). Keys should be
+ * 8 characters or less (not counting the terminating null).
+ *
+ * valueSize: The size of the value.
+ *
+ * value: Any binary value. For values that represent
+ * textual data, UTF-8 is STRONGLY recommended.
+ * For values that represent textual data, valueSize
+ * should NOT include the terminating null (if any)
+ * at the end of the string.
+ * If NULL, then "key" will be added with no value.
+ * If non-NULL but valueSize is zero, then "key=" will be
+ * added with empty value.
+ *
+ * return value: Returns kDNSServiceErr_NoError on success.
+ * Returns kDNSServiceErr_Invalid if the "key" string contains
+ * illegal characters.
+ * Returns kDNSServiceErr_NoMemory if adding this key would
+ * exceed the available storage.
+ */
+
+DNSServiceErrorType DNSSD_API TXTRecordSetValue
+ (
+ TXTRecordRef *txtRecord,
+ const char *key,
+ uint8_t valueSize, /* may be zero */
+ const void *value /* may be NULL */
+ );
+
+
+/* TXTRecordRemoveValue()
+ *
+ * Removes a key from a TXTRecordRef. The "key" must be an
+ * ASCII string which exists in the TXTRecordRef.
+ *
+ * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate().
+ *
+ * key: A key name which exists in the TXTRecordRef.
+ *
+ * return value: Returns kDNSServiceErr_NoError on success.
+ * Returns kDNSServiceErr_NoSuchKey if the "key" does not
+ * exist in the TXTRecordRef.
+ *
+ */
+
+DNSServiceErrorType DNSSD_API TXTRecordRemoveValue
+ (
+ TXTRecordRef *txtRecord,
+ const char *key
+ );
+
+
+/* TXTRecordGetLength()
+ *
+ * Allows you to determine the length of the raw bytes within a TXTRecordRef.
+ *
+ * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate().
+ *
+ * return value: Returns the size of the raw bytes inside a TXTRecordRef
+ * which you can pass directly to DNSServiceRegister() or
+ * to DNSServiceUpdateRecord().
+ * Returns 0 if the TXTRecordRef is empty.
+ *
+ */
+
+uint16_t DNSSD_API TXTRecordGetLength
+ (
+ const TXTRecordRef *txtRecord
+ );
+
+
+/* TXTRecordGetBytesPtr()
+ *
+ * Allows you to retrieve a pointer to the raw bytes within a TXTRecordRef.
+ *
+ * txtRecord: A TXTRecordRef initialized by calling TXTRecordCreate().
+ *
+ * return value: Returns a pointer to the raw bytes inside the TXTRecordRef
+ * which you can pass directly to DNSServiceRegister() or
+ * to DNSServiceUpdateRecord().
+ *
+ */
+
+const void * DNSSD_API TXTRecordGetBytesPtr
+ (
+ const TXTRecordRef *txtRecord
+ );
+
+
+/*********************************************************************************************
+ *
+ * TXT Record Parsing Functions
+ *
+ *********************************************************************************************/
+
+/*
+ * A typical calling sequence for TXT record parsing is something like:
+ *
+ * Receive TXT record data in DNSServiceResolve() callback
+ * if (TXTRecordContainsKey(txtLen, txtRecord, "key")) then do something
+ * val1ptr = TXTRecordGetValuePtr(txtLen, txtRecord, "key1", &len1);
+ * val2ptr = TXTRecordGetValuePtr(txtLen, txtRecord, "key2", &len2);
+ * ...
+ * bcopy(val1ptr, myval1, len1);
+ * bcopy(val2ptr, myval2, len2);
+ * ...
+ * return;
+ *
+ * If you wish to retain the values after return from the DNSServiceResolve()
+ * callback, then you need to copy the data to your own storage using bcopy()
+ * or similar, as shown in the example above.
+ *
+ * If for some reason you need to parse a TXT record you built yourself
+ * using the TXT record construction functions above, then you can do
+ * that using TXTRecordGetLength and TXTRecordGetBytesPtr calls:
+ * TXTRecordGetValue(TXTRecordGetLength(x), TXTRecordGetBytesPtr(x), key, &len);
+ *
+ * Most applications only fetch keys they know about from a TXT record and
+ * ignore the rest.
+ * However, some debugging tools wish to fetch and display all keys.
+ * To do that, use the TXTRecordGetCount() and TXTRecordGetItemAtIndex() calls.
+ */
+
+/* TXTRecordContainsKey()
+ *
+ * Allows you to determine if a given TXT Record contains a specified key.
+ *
+ * txtLen: The size of the received TXT Record.
+ *
+ * txtRecord: Pointer to the received TXT Record bytes.
+ *
+ * key: A null-terminated ASCII string containing the key name.
+ *
+ * return value: Returns 1 if the TXT Record contains the specified key.
+ * Otherwise, it returns 0.
+ *
+ */
+
+int DNSSD_API TXTRecordContainsKey
+ (
+ uint16_t txtLen,
+ const void *txtRecord,
+ const char *key
+ );
+
+
+/* TXTRecordGetValuePtr()
+ *
+ * Allows you to retrieve the value for a given key from a TXT Record.
+ *
+ * txtLen: The size of the received TXT Record
+ *
+ * txtRecord: Pointer to the received TXT Record bytes.
+ *
+ * key: A null-terminated ASCII string containing the key name.
+ *
+ * valueLen: On output, will be set to the size of the "value" data.
+ *
+ * return value: Returns NULL if the key does not exist in this TXT record,
+ * or exists with no value (to differentiate between
+ * these two cases use TXTRecordContainsKey()).
+ * Returns pointer to location within TXT Record bytes
+ * if the key exists with empty or non-empty value.
+ * For empty value, valueLen will be zero.
+ * For non-empty value, valueLen will be length of value data.
+ */
+
+const void * DNSSD_API TXTRecordGetValuePtr
+ (
+ uint16_t txtLen,
+ const void *txtRecord,
+ const char *key,
+ uint8_t *valueLen
+ );
+
+
+/* TXTRecordGetCount()
+ *
+ * Returns the number of keys stored in the TXT Record. The count
+ * can be used with TXTRecordGetItemAtIndex() to iterate through the keys.
+ *
+ * txtLen: The size of the received TXT Record.
+ *
+ * txtRecord: Pointer to the received TXT Record bytes.
+ *
+ * return value: Returns the total number of keys in the TXT Record.
+ *
+ */
+
+uint16_t DNSSD_API TXTRecordGetCount
+ (
+ uint16_t txtLen,
+ const void *txtRecord
+ );
+
+
+/* TXTRecordGetItemAtIndex()
+ *
+ * Allows you to retrieve a key name and value pointer, given an index into
+ * a TXT Record. Legal index values range from zero to TXTRecordGetCount()-1.
+ * It's also possible to iterate through keys in a TXT record by simply
+ * calling TXTRecordGetItemAtIndex() repeatedly, beginning with index zero
+ * and increasing until TXTRecordGetItemAtIndex() returns kDNSServiceErr_Invalid.
+ *
+ * On return:
+ * For keys with no value, *value is set to NULL and *valueLen is zero.
+ * For keys with empty value, *value is non-NULL and *valueLen is zero.
+ * For keys with non-empty value, *value is non-NULL and *valueLen is non-zero.
+ *
+ * txtLen: The size of the received TXT Record.
+ *
+ * txtRecord: Pointer to the received TXT Record bytes.
+ *
+ * index: An index into the TXT Record.
+ *
+ * keyBufLen: The size of the string buffer being supplied.
+ *
+ * key: A string buffer used to store the key name.
+ * On return, the buffer contains a null-terminated C string
+ * giving the key name. DNS-SD TXT keys are usually
+ * 8 characters or less. To hold the maximum possible
+ * key name, the buffer should be 256 bytes long.
+ *
+ * valueLen: On output, will be set to the size of the "value" data.
+ *
+ * value: On output, *value is set to point to location within TXT
+ * Record bytes that holds the value data.
+ *
+ * return value: Returns kDNSServiceErr_NoError on success.
+ * Returns kDNSServiceErr_NoMemory if keyBufLen is too short.
+ * Returns kDNSServiceErr_Invalid if index is greater than
+ * TXTRecordGetCount()-1.
+ */
+
+DNSServiceErrorType DNSSD_API TXTRecordGetItemAtIndex
+ (
+ uint16_t txtLen,
+ const void *txtRecord,
+ uint16_t index,
+ uint16_t keyBufLen,
+ char *key,
+ uint8_t *valueLen,
+ const void **value
+ );
+
+#ifdef __APPLE_API_PRIVATE
+
+/*
+ * Mac OS X specific functionality
+ * 3rd party clients of this API should not depend on future support or availability of this routine
+ */
+
+/* DNSServiceSetDefaultDomainForUser()
+ *
+ * Set the default domain for the caller's UID. Future browse and registration
+ * calls by this user that do not specify an explicit domain will browse and
+ * register in this wide-area domain in addition to .local. In addition, this
+ * domain will be returned as a Browse domain via domain enumeration calls.
+ *
+ *
+ * Parameters:
+ *
+ * flags: Pass kDNSServiceFlagsAdd to add a domain for a user. Call without
+ * this flag set to clear a previously added domain.
+ *
+ * domain: The domain to be used for the caller's UID.
+ *
+ * return value: Returns kDNSServiceErr_NoError on succeses, otherwise returns
+ * an error code indicating the error that occurred
+ */
+
+DNSServiceErrorType DNSSD_API DNSServiceSetDefaultDomainForUser
+ (
+ DNSServiceFlags flags,
+ const char *domain
+ );
+
+#endif //__APPLE_API_PRIVATE
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _DNS_SD_H */
projects / catta / commitdiff