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1e494cf4 JB |
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 | #ifndef __CUTILS_SOCKETS_H | |
18 | #define __CUTILS_SOCKETS_H | |
19 | ||
20 | #include <errno.h> | |
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <stdbool.h> | |
24 | ||
25 | #ifdef HAVE_WINSOCK | |
26 | #include <winsock2.h> | |
27 | typedef int socklen_t; | |
28 | #elif HAVE_SYS_SOCKET_H | |
29 | #include <sys/socket.h> | |
30 | #endif | |
31 | ||
32 | #define ANDROID_SOCKET_ENV_PREFIX "ANDROID_SOCKET_" | |
33 | #define ANDROID_SOCKET_DIR "/dev/socket" | |
34 | ||
35 | #ifdef __cplusplus | |
36 | extern "C" { | |
37 | #endif | |
38 | ||
39 | /* | |
40 | * android_get_control_socket - simple helper function to get the file | |
41 | * descriptor of our init-managed Unix domain socket. `name' is the name of the | |
42 | * socket, as given in init.rc. Returns -1 on error. | |
43 | * | |
44 | * This is inline and not in libcutils proper because we want to use this in | |
45 | * third-party daemons with minimal modification. | |
46 | */ | |
47 | static inline int android_get_control_socket(const char *name) | |
48 | { | |
49 | char key[64] = ANDROID_SOCKET_ENV_PREFIX; | |
50 | const char *val; | |
51 | int fd; | |
52 | ||
53 | /* build our environment variable, counting cycles like a wolf ... */ | |
54 | #if HAVE_STRLCPY | |
55 | strlcpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1, | |
56 | name, | |
57 | sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX)); | |
58 | #else /* for the host, which may lack the almightly strncpy ... */ | |
59 | strncpy(key + sizeof(ANDROID_SOCKET_ENV_PREFIX) - 1, | |
60 | name, | |
61 | sizeof(key) - sizeof(ANDROID_SOCKET_ENV_PREFIX)); | |
62 | key[sizeof(key)-1] = '\0'; | |
63 | #endif | |
64 | ||
65 | val = getenv(key); | |
66 | if (!val) | |
67 | return -1; | |
68 | ||
69 | errno = 0; | |
70 | fd = strtol(val, NULL, 10); | |
71 | if (errno) | |
72 | return -1; | |
73 | ||
74 | return fd; | |
75 | } | |
76 | ||
77 | /* | |
78 | * See also android.os.LocalSocketAddress.Namespace | |
79 | */ | |
80 | // Linux "abstract" (non-filesystem) namespace | |
81 | #define ANDROID_SOCKET_NAMESPACE_ABSTRACT 0 | |
82 | // Android "reserved" (/dev/socket) namespace | |
83 | #define ANDROID_SOCKET_NAMESPACE_RESERVED 1 | |
84 | // Normal filesystem namespace | |
85 | #define ANDROID_SOCKET_NAMESPACE_FILESYSTEM 2 | |
86 | ||
87 | extern int socket_loopback_client(int port, int type); | |
88 | extern int socket_network_client(const char *host, int port, int type); | |
89 | extern int socket_loopback_server(int port, int type); | |
90 | extern int socket_local_server(const char *name, int namespaceId, int type); | |
91 | extern int socket_local_server_bind(int s, const char *name, int namespaceId); | |
92 | extern int socket_local_client_connect(int fd, | |
93 | const char *name, int namespaceId, int type); | |
94 | extern int socket_local_client(const char *name, int namespaceId, int type); | |
95 | extern int socket_inaddr_any_server(int port, int type); | |
96 | ||
97 | /* | |
98 | * socket_peer_is_trusted - Takes a socket which is presumed to be a | |
99 | * connected local socket (e.g. AF_LOCAL) and returns whether the peer | |
100 | * (the userid that owns the process on the other end of that socket) | |
101 | * is one of the two trusted userids, root or shell. | |
102 | * | |
103 | * Note: This only works as advertised on the Android OS and always | |
104 | * just returns true when called on other operating systems. | |
105 | */ | |
106 | extern bool socket_peer_is_trusted(int fd); | |
107 | ||
108 | #ifdef __cplusplus | |
109 | } | |
110 | #endif | |
111 | ||
112 | #endif /* __CUTILS_SOCKETS_H */ |