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compat.c
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compat.c
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/* $Id$ */
/***
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 <fcntl.h>
#include <sys/types.h>
#include <sys/socket.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 <avahi-client/publish.h>
#include <avahi-client/lookup.h>
#include "warn.h"
#include "dns_sd.h"
enum {
COMMAND_POLL = 'p',
COMMAND_QUIT = 'q',
COMMAND_POLL_DONE = 'P',
COMMAND_POLL_FAILED = 'F'
};
struct type_info {
char *type;
AvahiStringList *subtypes;
int n_subtypes;
};
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;
struct type_info type_info;
char *service_name, *service_name_chosen, *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:
case AVAHI_ERR_INVALID_SERVICE_SUBTYPE:
return kDNSServiceErr_BadParam;
case AVAHI_ERR_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_DISCONNECTED:
case AVAHI_ERR_NO_DAEMON:
break;
}
return kDNSServiceErr_Unknown;
}
static void type_info_init(struct type_info *i) {
assert(i);
i->type = NULL;
i->subtypes = NULL;
i->n_subtypes = 0;
}
static void type_info_free(struct type_info *i) {
assert(i);
avahi_free(i->type);
avahi_string_list_free(i->subtypes);
type_info_init(i);
}
static int type_info_parse(struct type_info *i, const char *t) {
char *token = NULL;
assert(i);
assert(t);
type_info_init(i);
for (;;) {
size_t l;
if (*t == 0)
break;
l = strcspn(t, ",");
if (l <= 0)
goto fail;
token = avahi_strndup(t, l);
if (!token)
goto fail;
if (!i->type) {
/* This is the first token, hence the main type */
if (!avahi_is_valid_service_type_strict(token))
goto fail;
i->type = token;
token = NULL;
} else {
char *fst;
/* This is not the first token, hence a subtype */
if (!(fst = avahi_strdup_printf("%s._sub.%s", token, i->type)))
goto fail;
if (!avahi_is_valid_service_subtype(fst)) {
avahi_free(fst);
goto fail;
}
i->subtypes = avahi_string_list_add(i->subtypes, fst);
avahi_free(fst);
avahi_free(token);
token = NULL;
i->n_subtypes++;
}
t += l;
if (*t == ',')
t++;
}
if (i->type)
return 0;
fail:
type_info_free(i);
avahi_free(token);
return -1;
}
static const char *add_trailing_dot(const char *s, char *buf, size_t buf_len) {
if (!s)
return NULL;
if (*s == 0)
return s;
if (s[strlen(s)-1] == '.')
return s;
snprintf(buf, buf_len, "%s.", s);
return buf;
}
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: {
int ret;
ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
for (;;) {
errno = 0;
if ((ret = avahi_simple_poll_run(sdref->simple_poll)) < 0) {
if (errno == EINTR)
continue;
fprintf(stderr, __FILE__": avahi_simple_poll_run() failed: %s\n", strerror(errno));
}
break;
}
ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
if (write_command(sdref->thread_fd, ret < 0 ? COMMAND_POLL_FAILED : COMMAND_POLL_DONE) < 0)
break;
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_domain = sdref->service_host = NULL;
sdref->service_txt = NULL;
type_info_init(&sdref->type_info);
ASSERT_SUCCESS(pthread_mutexattr_init(&mutex_attr));
pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_RECURSIVE);
ASSERT_SUCCESS(pthread_mutex_init(&sdref->mutex, &mutex_attr));
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 an initial 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) {
ASSERT_SUCCESS(write_command(sdref->main_fd, COMMAND_QUIT));
avahi_simple_poll_wakeup(sdref->simple_poll);
ASSERT_SUCCESS(pthread_join(sdref->thread, NULL));
}
if (sdref->client)
avahi_client_free(sdref->client);
if (sdref->simple_poll)
avahi_simple_poll_free(sdref->simple_poll);
if (sdref->thread_fd >= 0)
close(sdref->thread_fd);
if (sdref->main_fd >= 0)
close(sdref->main_fd);
ASSERT_SUCCESS(pthread_mutex_destroy(&sdref->mutex));
avahi_free(sdref->service_name);
avahi_free(sdref->service_name_chosen);
avahi_free(sdref->service_domain);
avahi_free(sdref->service_host);
type_info_free(&sdref->type_info);
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) {
if (!sdref || sdref->n_ref <= 0)
return -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;
ASSERT_SUCCESS(pthread_mutex_lock(&sdref->mutex));
sdref_ref(sdref);
/* Cleanup notification socket */
if (read_command(sdref->main_fd) != COMMAND_POLL_DONE)
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:
sdref_unref(sdref);
ASSERT_SUCCESS(pthread_mutex_unlock(&sdref->mutex));
return ret;
}
void DNSSD_API DNSServiceRefDeallocate(DNSServiceRef sdref) {
AVAHI_WARN_LINKAGE;
if (sdref)
sdref_unref(sdref);
}
static void service_browser_callback(
AvahiServiceBrowser *b,
AvahiIfIndex interface,
AVAHI_GCC_UNUSED AvahiProtocol protocol,
AvahiBrowserEvent event,
const char *name,
const char *type,
const char *domain,
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
void *userdata) {
DNSServiceRef sdref = userdata;
char type_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
assert(b);
assert(sdref);
assert(sdref->n_ref >= 1);
type = add_trailing_dot(type, type_fixed, sizeof(type_fixed));
domain = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
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, map_error(avahi_client_errno(sdref->client)), 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;
int error = kDNSServiceErr_Unknown;
assert(s);
assert(sdref);
assert(sdref->n_ref >= 1);
switch (state) {
case AVAHI_CLIENT_FAILURE:
if (sdref->service_browser_callback)
sdref->service_browser_callback(sdref, 0, 0, error, NULL, NULL, NULL, sdref->context);
else if (sdref->service_resolver_callback)
sdref->service_resolver_callback(sdref, 0, 0, error, NULL, NULL, 0, 0, NULL, sdref->context);
else if (sdref->domain_browser_callback)
sdref->domain_browser_callback(sdref, 0, 0, error, NULL, sdref->context);
break;
case AVAHI_CLIENT_S_RUNNING:
case AVAHI_CLIENT_S_COLLISION:
case AVAHI_CLIENT_S_REGISTERING:
case AVAHI_CLIENT_CONNECTING:
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;
struct type_info type_info;
AVAHI_WARN_LINKAGE;
assert(ret_sdref);
assert(regtype);
assert(callback);
if (interface == kDNSServiceInterfaceIndexLocalOnly || flags != 0) {
AVAHI_WARN_UNSUPPORTED;
return kDNSServiceErr_Unsupported;
}
type_info_init(&type_info);
if (type_info_parse(&type_info, regtype) < 0 || type_info.n_subtypes > 1) {
type_info_free(&type_info);
if (!avahi_is_valid_service_type_generic(regtype))
return kDNSServiceErr_Unsupported;
} else
regtype = type_info.subtypes ? (char*) type_info.subtypes->text : type_info.type;
if (!(sdref = sdref_new())) {
type_info_free(&type_info);
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), 0, 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);
type_info_free(&type_info);
return ret;
}
static void service_resolver_callback(
AvahiServiceResolver *r,
AvahiIfIndex interface,
AVAHI_GCC_UNUSED AvahiProtocol protocol,
AvahiResolverEvent event,
const char *name,
const char *type,
const char *domain,
const char *host_name,
AVAHI_GCC_UNUSED const AvahiAddress *a,
uint16_t port,
AvahiStringList *txt,
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
void *userdata) {
DNSServiceRef sdref = userdata;
assert(r);
assert(sdref);
assert(sdref->n_ref >= 1);
switch (event) {
case AVAHI_RESOLVER_FOUND: {
char host_name_fixed[AVAHI_DOMAIN_NAME_MAX];
char full_name[AVAHI_DOMAIN_NAME_MAX];
int ret;
char *p = NULL;
size_t l = 0;
host_name = add_trailing_dot(host_name, host_name_fixed, sizeof(host_name_fixed));
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_join(full_name, sizeof(full_name), name, type, domain);
assert(ret == AVAHI_OK);
strcat(full_name, ".");
sdref->service_resolver_callback(sdref, 0, interface, kDNSServiceErr_NoError, full_name, host_name, htons(port), l, (unsigned char*) p, sdref->context);
avahi_free(p);
break;
}
case AVAHI_RESOLVER_FAILURE:
sdref->service_resolver_callback(sdref, 0, interface, map_error(avahi_client_errno(sdref->client)), NULL, NULL, 0, 0, NULL, sdref->context);
break;
}
}
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) {
AVAHI_WARN_UNSUPPORTED;
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), 0, 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_join(fullName, kDNSServiceMaxDomainName, service, regtype, domain) < 0)
return -1;
return 0;
}
static void domain_browser_callback(
AvahiDomainBrowser *b,
AvahiIfIndex interface,
AVAHI_GCC_UNUSED AvahiProtocol protocol,
AvahiBrowserEvent event,
const char *domain,
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
void *userdata) {
DNSServiceRef sdref = userdata;
static char domain_fixed[AVAHI_DOMAIN_NAME_MAX];
assert(b);
assert(sdref);
assert(sdref->n_ref >= 1);
domain = add_trailing_dot(domain, domain_fixed, sizeof(domain_fixed));
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, map_error(avahi_client_errno(sdref->client)), 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)) {
AVAHI_WARN_UNSUPPORTED;
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), 0, 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, "local",
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) {
char regtype_fixed[AVAHI_DOMAIN_NAME_MAX], domain_fixed[AVAHI_DOMAIN_NAME_MAX];
const char *regtype, *domain;
assert(sdref);
assert(sdref->n_ref >= 1);
if (!sdref->service_register_callback)
return;
regtype = add_trailing_dot(sdref->type_info.type, regtype_fixed, sizeof(regtype_fixed));
domain = add_trailing_dot(sdref->service_domain, domain_fixed, sizeof(domain_fixed));
sdref->service_register_callback(
sdref, 0, error,
sdref->service_name_chosen ? sdref->service_name_chosen : sdref->service_name,
regtype,
domain,
sdref->context);
}
static int reg_create_service(DNSServiceRef sdref) {
int ret;
AvahiStringList *l;
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->type_info.type,
sdref->service_domain,
sdref->service_host,
sdref->service_port,
sdref->service_txt)) < 0)
return ret;
for (l = sdref->type_info.subtypes; l; l = l->next) {
/* Create a subtype entry */
if (avahi_entry_group_add_service_subtype(
sdref->entry_group,
sdref->service_interface,
AVAHI_PROTO_UNSPEC,
0,
sdref->service_name_chosen,
sdref->type_info.type,
sdref->service_domain,
(const char*) l->text) < 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_FAILURE:
reg_report_error(sdref, kDNSServiceErr_Unknown);
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);
sdref->service_name_chosen = NULL;
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;
}