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 */ 113
