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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.
*/
#ifndef __CUTILS_SOCKETS_H
#define __CUTILS_SOCKETS_H
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#ifdef HAVE_WINSOCK
#include <winsock2.h>
typedef int socklen_t;
#elif HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#define ANDROID_SOCKET_ENV_PREFIX "ANDROID_SOCKET_"
#define ANDROID_SOCKET_DIR "/dev/socket"
#ifdef __cplusplus
extern "C" {
#endif
/*
* android_get_control_socket - simple helper function to get the file
* descriptor of our init-managed Unix domain socket. `name' is the name of the
* socket, as given in init.rc. Returns -1 on error.
*
* This is inline and not in libcutils proper because we want to use this in
* third-party daemons with minimal modification.
*/
static inline int android_get_control_socket(const char *name)
{
char key[64] = ANDROID_SOCKET_ENV_PREFIX;
const char *val;
int fd;
/* build our environment variable, counting cycles like a wolf ... */
#if HAVE_STRLCPY
strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
name,
sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
#else /* for the host, which may lack the almightly strncpy ... */
strncpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1,
name,
sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX));
key[sizeof(key)-1] = '\0';
#endif
val = getenv(key);
if (!val)
return -1;
errno = 0;
fd = strtol(val, NULL, 10);
if (errno)
return -1;
return fd;
}
/*
* See also android.os.LocalSocketAddress.Namespace
*/
// Linux "abstract" (non-filesystem) namespace
#define ANDROID_SOCKET_NAMESPACE_ABSTRACT 0
// Android "reserved" (/dev/socket) namespace
#define ANDROID_SOCKET_NAMESPACE_RESERVED 1
// Normal filesystem namespace
#define ANDROID_SOCKET_NAMESPACE_FILESYSTEM 2
extern int socket_loopback_client(int port, int type);
extern int socket_network_client(const char *host, int port, int type);
extern int socket_network_client_timeout(const char *host, int port, int type,
int timeout);
extern int socket_loopback_server(int port, int type);
extern int socket_local_server(const char *name, int namespaceId, int type);
extern int socket_local_server_bind(int s, const char *name, int namespaceId);
extern int socket_local_client_connect(int fd,
const char *name, int namespaceId, int type);
extern int socket_local_client(const char *name, int namespaceId, int type);
extern int socket_inaddr_any_server(int port, int type);
/*
* socket_peer_is_trusted - Takes a socket which is presumed to be a
* connected local socket (e.g. AF_LOCAL) and returns whether the peer
* (the userid that owns the process on the other end of that socket)
* is one of the two trusted userids, root or shell.
*
* Note: This only works as advertised on the Android OS and always
* just returns true when called on other operating systems.
*/
extern bool socket_peer_is_trusted(int fd);
#ifdef __cplusplus
}
#endif
#endif /* __CUTILS_SOCKETS_H */
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