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/*
* Copyright (C) 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_client(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 "socket_local.h"
#define LISTEN_BACKLOG 4
/* Documented in header file. */
int socket_make_sockaddr_un(const char *name, int namespaceId,
struct sockaddr_un *p_addr, socklen_t *alen)
{
memset (p_addr, 0, sizeof (*p_addr));
size_t namelen;
switch (namespaceId) {
case ANDROID_SOCKET_NAMESPACE_ABSTRACT:
#ifdef HAVE_LINUX_LOCAL_SOCKET_NAMESPACE
namelen = strlen(name);
// Test with length +1 for the *initial* '\0'.
if ((namelen + 1) > sizeof(p_addr->sun_path)) {
goto error;
}
/*
* Note: The path in this case is *not* supposed to be
* '\0'-terminated. ("man 7 unix" for the gory details.)
*/
p_addr->sun_path[0] = 0;
memcpy(p_addr->sun_path + 1, name, namelen);
#else /*HAVE_LINUX_LOCAL_SOCKET_NAMESPACE*/
/* this OS doesn't have the Linux abstract namespace */
namelen = strlen(name) + strlen(FILESYSTEM_SOCKET_PREFIX);
/* unix_path_max appears to be missing on linux */
if (namelen > sizeof(*p_addr)
- offsetof(struct sockaddr_un, sun_path) - 1) {
goto error;
}
strcpy(p_addr->sun_path, FILESYSTEM_SOCKET_PREFIX);
strcat(p_addr->sun_path, name);
#endif /*HAVE_LINUX_LOCAL_SOCKET_NAMESPACE*/
break;
case ANDROID_SOCKET_NAMESPACE_RESERVED:
namelen = strlen(name) + strlen(ANDROID_RESERVED_SOCKET_PREFIX);
/* unix_path_max appears to be missing on linux */
if (namelen > sizeof(*p_addr)
- offsetof(struct sockaddr_un, sun_path) - 1) {
goto error;
}
strcpy(p_addr->sun_path, ANDROID_RESERVED_SOCKET_PREFIX);
strcat(p_addr->sun_path, name);
break;
case ANDROID_SOCKET_NAMESPACE_FILESYSTEM:
namelen = strlen(name);
/* unix_path_max appears to be missing on linux */
if (namelen > sizeof(*p_addr)
- offsetof(struct sockaddr_un, sun_path) - 1) {
goto error;
}
strcpy(p_addr->sun_path, name);
break;
default:
// invalid namespace id
return -1;
}
p_addr->sun_family = AF_LOCAL;
*alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1;
return 0;
error:
return -1;
}
/**
* connect to peer named "name" on fd
* returns same fd or -1 on error.
* fd is not closed on error. that's your job.
*
* Used by AndroidSocketImpl
*/
int socket_local_client_connect(int fd, const char *name, int namespaceId,
int type)
{
struct sockaddr_un addr;
socklen_t alen;
size_t namelen;
int err;
err = socket_make_sockaddr_un(name, namespaceId, &addr, &alen);
if (err < 0) {
goto error;
}
if(connect(fd, (struct sockaddr *) &addr, alen) < 0) {
goto error;
}
return fd;
error:
return -1;
}
/**
* connect to peer named "name"
* returns fd or -1 on error
*/
int socket_local_client(const char *name, int namespaceId, int type)
{
int s;
s = socket(AF_LOCAL, type, 0);
if(s < 0) return -1;
if ( 0 > socket_local_client_connect(s, name, namespaceId, type)) {
close(s);
return -1;
}
return s;
}
#endif /* !HAVE_WINSOCK */
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