The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame^] | 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 | #include <cutils/sockets.h> |
| 18 | |
| 19 | #include <stdlib.h> |
| 20 | #include <string.h> |
| 21 | #include <unistd.h> |
| 22 | #include <errno.h> |
| 23 | #include <stddef.h> |
| 24 | |
| 25 | #ifdef HAVE_WINSOCK |
| 26 | |
| 27 | int socket_local_client(const char *name, int namespaceId, int type) |
| 28 | { |
| 29 | errno = ENOSYS; |
| 30 | return -1; |
| 31 | } |
| 32 | |
| 33 | #else /* !HAVE_WINSOCK */ |
| 34 | |
| 35 | #include <sys/socket.h> |
| 36 | #include <sys/un.h> |
| 37 | #include <sys/select.h> |
| 38 | #include <sys/types.h> |
| 39 | |
| 40 | #include "socket_local.h" |
| 41 | |
| 42 | #define LISTEN_BACKLOG 4 |
| 43 | |
| 44 | /* Documented in header file. */ |
| 45 | int socket_make_sockaddr_un(const char *name, int namespaceId, |
| 46 | struct sockaddr_un *p_addr, socklen_t *alen) |
| 47 | { |
| 48 | memset (p_addr, 0, sizeof (*p_addr)); |
| 49 | size_t namelen; |
| 50 | |
| 51 | switch (namespaceId) { |
| 52 | case ANDROID_SOCKET_NAMESPACE_ABSTRACT: |
| 53 | #ifdef HAVE_LINUX_LOCAL_SOCKET_NAMESPACE |
| 54 | namelen = strlen(name); |
| 55 | |
| 56 | // Test with length +1 for the *initial* '\0'. |
| 57 | if ((namelen + 1) > sizeof(p_addr->sun_path)) { |
| 58 | goto error; |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * Note: The path in this case is *not* supposed to be |
| 63 | * '\0'-terminated. ("man 7 unix" for the gory details.) |
| 64 | */ |
| 65 | |
| 66 | p_addr->sun_path[0] = 0; |
| 67 | memcpy(p_addr->sun_path + 1, name, namelen); |
| 68 | #else /*HAVE_LINUX_LOCAL_SOCKET_NAMESPACE*/ |
| 69 | /* this OS doesn't have the Linux abstract namespace */ |
| 70 | |
| 71 | namelen = strlen(name) + strlen(FILESYSTEM_SOCKET_PREFIX); |
| 72 | /* unix_path_max appears to be missing on linux */ |
| 73 | if (namelen > sizeof(*p_addr) |
| 74 | - offsetof(struct sockaddr_un, sun_path) - 1) { |
| 75 | goto error; |
| 76 | } |
| 77 | |
| 78 | strcpy(p_addr->sun_path, FILESYSTEM_SOCKET_PREFIX); |
| 79 | strcat(p_addr->sun_path, name); |
| 80 | #endif /*HAVE_LINUX_LOCAL_SOCKET_NAMESPACE*/ |
| 81 | break; |
| 82 | |
| 83 | case ANDROID_SOCKET_NAMESPACE_RESERVED: |
| 84 | namelen = strlen(name) + strlen(ANDROID_RESERVED_SOCKET_PREFIX); |
| 85 | /* unix_path_max appears to be missing on linux */ |
| 86 | if (namelen > sizeof(*p_addr) |
| 87 | - offsetof(struct sockaddr_un, sun_path) - 1) { |
| 88 | goto error; |
| 89 | } |
| 90 | |
| 91 | strcpy(p_addr->sun_path, ANDROID_RESERVED_SOCKET_PREFIX); |
| 92 | strcat(p_addr->sun_path, name); |
| 93 | break; |
| 94 | |
| 95 | case ANDROID_SOCKET_NAMESPACE_FILESYSTEM: |
| 96 | namelen = strlen(name); |
| 97 | /* unix_path_max appears to be missing on linux */ |
| 98 | if (namelen > sizeof(*p_addr) |
| 99 | - offsetof(struct sockaddr_un, sun_path) - 1) { |
| 100 | goto error; |
| 101 | } |
| 102 | |
| 103 | strcpy(p_addr->sun_path, name); |
| 104 | break; |
| 105 | default: |
| 106 | // invalid namespace id |
| 107 | return -1; |
| 108 | } |
| 109 | |
| 110 | p_addr->sun_family = AF_LOCAL; |
| 111 | *alen = namelen + offsetof(struct sockaddr_un, sun_path) + 1; |
| 112 | return 0; |
| 113 | error: |
| 114 | return -1; |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * connect to peer named "name" on fd |
| 119 | * returns same fd or -1 on error. |
| 120 | * fd is not closed on error. that's your job. |
| 121 | * |
| 122 | * Used by AndroidSocketImpl |
| 123 | */ |
| 124 | int socket_local_client_connect(int fd, const char *name, int namespaceId, |
| 125 | int type) |
| 126 | { |
| 127 | struct sockaddr_un addr; |
| 128 | socklen_t alen; |
| 129 | size_t namelen; |
| 130 | int err; |
| 131 | |
| 132 | err = socket_make_sockaddr_un(name, namespaceId, &addr, &alen); |
| 133 | |
| 134 | if (err < 0) { |
| 135 | goto error; |
| 136 | } |
| 137 | |
| 138 | if(connect(fd, (struct sockaddr *) &addr, alen) < 0) { |
| 139 | goto error; |
| 140 | } |
| 141 | |
| 142 | return fd; |
| 143 | |
| 144 | error: |
| 145 | return -1; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * connect to peer named "name" |
| 150 | * returns fd or -1 on error |
| 151 | */ |
| 152 | int socket_local_client(const char *name, int namespaceId, int type) |
| 153 | { |
| 154 | int s; |
| 155 | |
| 156 | s = socket(AF_LOCAL, type, 0); |
| 157 | if(s < 0) return -1; |
| 158 | |
| 159 | if ( 0 > socket_local_client_connect(s, name, namespaceId, type)) { |
| 160 | close(s); |
| 161 | return -1; |
| 162 | } |
| 163 | |
| 164 | return s; |
| 165 | } |
| 166 | |
| 167 | #endif /* !HAVE_WINSOCK */ |