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