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/* libs/cutils/socket_local_server.c
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <cutils/sockets.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stddef.h>
#ifdef HAVE_WINSOCK
int socket_local_server(const char *name, int namespaceId, int type)
{
errno = ENOSYS;
return -1;
}
#else /* !HAVE_WINSOCK */
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/select.h>
#include <sys/types.h>
#include <netinet/in.h>
#include "socket_local.h"
#define LISTEN_BACKLOG 4
/* Only the bottom bits are really the socket type; there are flags too. */
#define SOCK_TYPE_MASK 0xf
/**
* Binds a pre-created socket(AF_LOCAL) 's' to 'name'
* returns 's' on success, -1 on fail
*
* Does not call listen()
*/
int socket_local_server_bind(int s, const char *name, int namespaceId)
{
struct sockaddr_un addr;
socklen_t alen;
int n;
int err;
err = socket_make_sockaddr_un(name, namespaceId, &addr, &alen);
if (err < 0) {
return -1;
}
/* basically: if this is a filesystem path, unlink first */
#ifndef HAVE_LINUX_LOCAL_SOCKET_NAMESPACE
if (1) {
#else
if (namespaceId == ANDROID_SOCKET_NAMESPACE_RESERVED
|| namespaceId == ANDROID_SOCKET_NAMESPACE_FILESYSTEM) {
#endif
/*ignore ENOENT*/
unlink(addr.sun_path);
}
n = 1;
setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n));
if(bind(s, (struct sockaddr *) &addr, alen) < 0) {
return -1;
}
return s;
}
/** Open a server-side UNIX domain datagram socket in the Linux non-filesystem
* namespace
*
* Returns fd on success, -1 on fail
*/
int socket_local_server(const char *name, int namespace, int type)
{
int err;
int s;
s = socket(AF_LOCAL, type, 0);
if (s < 0) return -1;
err = socket_local_server_bind(s, name, namespace);
if (err < 0) {
close(s);
return -1;
}
if ((type & SOCK_TYPE_MASK) == SOCK_STREAM) {
int ret;
ret = listen(s, LISTEN_BACKLOG);
if (ret < 0) {
close(s);
return -1;
}
}
return s;
}
#endif /* !HAVE_WINSOCK */
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