1 /*
2 * Copyright (C) 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 #ifdef __cplusplus
30 extern "C" {
31 #endif
32
33 /*
34 * osi_android_get_control_socket - simple helper function to get the file
35 * descriptor of our init-managed Unix domain socket. `name' is the name of the
36 * socket, as given in init.rc. Returns -1 on error.
37 *
38 * This is inline and not in libcutils proper because we want to use this in
39 * third-party daemons with minimal modification.
40 */
osi_android_get_control_socket(const char * name)41 static inline int osi_android_get_control_socket(const char *name) {
42 char key[64];
43 snprintf(key, sizeof(key), ANDROID_SOCKET_ENV_PREFIX "%s", name);
44
45 const char *val = getenv(key);
46 if (!val) {
47 return -1;
48 }
49
50 errno = 0;
51 int fd = strtol(val, NULL, 10);
52 if (errno) {
53 return -1;
54 }
55
56 return fd;
57 }
58
59 /*
60 * See also android.os.LocalSocketAddress.Namespace
61 */
62 // Linux "abstract" (non-filesystem) namespace
63 #define ANDROID_SOCKET_NAMESPACE_ABSTRACT 0
64 // Android "reserved" (/dev/socket) namespace
65 #define ANDROID_SOCKET_NAMESPACE_RESERVED 1
66 // Normal filesystem namespace
67 #define ANDROID_SOCKET_NAMESPACE_FILESYSTEM 2
68
69 extern int osi_socket_local_server(const char *name, int namespaceId, int type);
70 extern int osi_socket_local_server_bind(int s, const char *name,
71 int namespaceId);
72 extern int osi_socket_local_client_connect(int fd, const char *name,
73 int namespaceId, int type);
74 extern int osi_socket_local_client(const char *name, int namespaceId, int type);
75
76 #ifdef __cplusplus
77 }
78 #endif
79