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 #include <errno.h> 18 #include <netinet/in.h> 19 #include <stddef.h> 20 #include <stdlib.h> 21 #include <string.h> 22 #include <sys/select.h> 23 #include <sys/socket.h> 24 #include <sys/types.h> 25 #include <sys/un.h> 26 #include <unistd.h> 27 28 #include "osi/include/socket_utils/socket_local.h" 29 #include "osi/include/socket_utils/sockets.h" 30 31 #define LISTEN_BACKLOG 4 32 33 /* Only the bottom bits are really the socket type; there are flags too. */ 34 #define SOCK_TYPE_MASK 0xf 35 36 /** 37 * Binds a pre-created socket(AF_LOCAL) 's' to 'name' 38 * returns 's' on success, -1 on fail 39 * 40 * Does not call listen() 41 */ 42 int osi_socket_local_server_bind(int s, const char* name, int namespaceId) { 43 struct sockaddr_un addr; 44 socklen_t alen; 45 int n; 46 int err; 47 48 err = osi_socket_make_sockaddr_un(name, namespaceId, &addr, &alen); 49 50 if (err < 0) { 51 return -1; 52 } 53 54 /* basically: if this is a filesystem path, unlink first */ 55 #if !defined(__linux__) 56 if (1) { 57 #else 58 if (namespaceId == ANDROID_SOCKET_NAMESPACE_RESERVED || 59 namespaceId == ANDROID_SOCKET_NAMESPACE_FILESYSTEM) { 60 #endif 61 /*ignore ENOENT*/ 62 unlink(addr.sun_path); 63 } 64 65 n = 1; 66 setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &n, sizeof(n)); 67 68 if (bind(s, (struct sockaddr*)&addr, alen) < 0) { 69 return -1; 70 } 71 72 return s; 73 } 74 75 /** Open a server-side UNIX domain datagram socket in the Linux non-filesystem 76 * namespace 77 * 78 * Returns fd on success, -1 on fail 79 */ 80 int osi_socket_local_server(const char* name, int namespaceId, int type) { 81 int err; 82 int s; 83 84 s = socket(AF_LOCAL, type, 0); 85 if (s < 0) return -1; 86 87 err = osi_socket_local_server_bind(s, name, namespaceId); 88 89 if (err < 0) { 90 close(s); 91 return -1; 92 } 93 94 if ((type & SOCK_TYPE_MASK) == SOCK_STREAM) { 95 int ret; 96 97 ret = listen(s, LISTEN_BACKLOG); 98 99 if (ret < 0) { 100 close(s); 101 return -1; 102 } 103 } 104 105 return s; 106 } 107
