1 /*
2 * Copyright 2006 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #pragma once
18
19 #include <errno.h>
20 #include <stdbool.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <string.h>
24 #include <sys/socket.h>
25
26 #define ANDROID_SOCKET_ENV_PREFIX "ANDROID_SOCKET_"
27 #define ANDROID_SOCKET_DIR "/dev/socket"
28
29 /*
30 * osi_android_get_control_socket - simple helper function to get the file
31 * descriptor of our init-managed Unix domain socket. `name' is the name of the
32 * socket, as given in init.rc. Returns -1 on error.
33 *
34 * This is inline and not in libcutils proper because we want to use this in
35 * third-party daemons with minimal modification.
36 */
osi_android_get_control_socket(const char * name)37 static inline int osi_android_get_control_socket(const char* name) {
38 char key[64];
39 snprintf(key, sizeof(key), ANDROID_SOCKET_ENV_PREFIX "%s", name);
40
41 const char* val = getenv(key);
42 if (!val) {
43 return -1;
44 }
45
46 errno = 0;
47 int fd = strtol(val, NULL, 10);
48 if (errno) {
49 return -1;
50 }
51
52 return fd;
53 }
54
55 /*
56 * See also android.os.LocalSocketAddress.Namespace
57 */
58 // Linux "abstract" (non-filesystem) namespace
59 #define ANDROID_SOCKET_NAMESPACE_ABSTRACT 0
60 // Android "reserved" (/dev/socket) namespace
61 #define ANDROID_SOCKET_NAMESPACE_RESERVED 1
62 // Normal filesystem namespace
63 #define ANDROID_SOCKET_NAMESPACE_FILESYSTEM 2
64
65 extern int osi_socket_local_server(const char* name, int namespaceId, int type);
66 extern int osi_socket_local_server_bind(int s, const char* name,
67 int namespaceId);
68 extern int osi_socket_local_client_connect(int fd, const char* name,
69 int namespaceId, int type);
70 extern int osi_socket_local_client(const char* name, int namespaceId, int type);
71