diff options
Diffstat (limited to 'compat-bonjour/compat.c')
-rw-r--r-- | compat-bonjour/compat.c | 536 |
1 files changed, 536 insertions, 0 deletions
diff --git a/compat-bonjour/compat.c b/compat-bonjour/compat.c new file mode 100644 index 0000000..6651845 --- /dev/null +++ b/compat-bonjour/compat.c @@ -0,0 +1,536 @@ +/* $Id$ */ + +/*** + 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-client/client.h> + + +#include "dns_sd.h" + +enum { + COMMAND_POLL = 'P', + COMMAND_QUIT = 'Q', + COMMAND_POLLED = 'D' +}; + +struct _DNSServiceRef_t { + 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; + + AvahiClient *client; + AvahiServiceBrowser *service_browser; + AvahiServiceResolver *service_resolver; +}; + +#define ASSERT_SUCCESS(r) { int __ret = (r); assert(__ret == 0); } + +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; + + if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) < 0) + goto fail; + + if (!(sdref = avahi_new(struct _DNSServiceRef_t, 1))) + goto fail; + + sdref->thread_fd = fd[0]; + sdref->main_fd = fd[1]; + + sdref->client = NULL; + sdref->service_browser = NULL; + sdref->service_resolver = NULL; + + 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; +} + +int DNSSD_API DNSServiceRefSockFD(DNSServiceRef sdRef) { + assert(sdRef); + + return sdRef->main_fd; +} + +DNSServiceErrorType DNSSD_API DNSServiceProcessResult(DNSServiceRef sdref) { + DNSServiceErrorType ret = kDNSServiceErr_Unknown; + + if (pthread_mutex_lock(&sdref->mutex) != 0) + return kDNSServiceErr_Unknown; + + /* 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 (avahi_simple_poll_prepare(sdref->simple_poll, -1) < 0) + goto finish; + + /* Request the poll */ + if (write_command(sdref->main_fd, COMMAND_POLL) < 0) + goto finish; + + ret = kDNSServiceErr_NoError; + +finish: + + pthread_mutex_unlock(&sdref->mutex); + + return ret; +} + +void DNSSD_API DNSServiceRefDeallocate(DNSServiceRef sdref) { + assert(sdref); + + fprintf(stderr, "deallocating()\n"); + + 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); +} + +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 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); + + 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, name, type, domain, sdref->context); + break; + + case AVAHI_BROWSER_NOT_FOUND: + sdref->service_browser_callback(sdref, 0, interface, kDNSServiceErr_NoSuchName, name, type, domain, sdref->context); + break; + + case AVAHI_BROWSER_CACHE_EXHAUSTED: + case AVAHI_BROWSER_ALL_FOR_NOW: + 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; + + 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), NULL, NULL, &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); + + switch (event) { + case AVAHI_RESOLVER_FOUND: { + + 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); + + sdref->service_resolver_callback(sdref, 0, interface, kDNSServiceErr_NoError, "blaa", 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; + + 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), NULL, NULL, &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; +} + |