The Android Open Source Project | c24a8e6 | 2009-03-03 19:28:42 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2007 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 <sys/stat.h> |
| 18 | #include "roots.h" |
| 19 | #include "common.h" |
| 20 | |
| 21 | #define CANARY_FILE "/system/build.prop" |
| 22 | #define CANARY_FILE_ROOT_PATH "SYSTEM:build.prop" |
| 23 | |
| 24 | int |
| 25 | file_exists(const char *path) |
| 26 | { |
| 27 | struct stat st; |
| 28 | int ret; |
| 29 | ret = stat(path, &st); |
| 30 | if (ret == 0) { |
| 31 | return S_ISREG(st.st_mode); |
| 32 | } |
| 33 | return 0; |
| 34 | } |
| 35 | |
| 36 | int |
| 37 | test_roots() |
| 38 | { |
| 39 | int ret; |
| 40 | |
| 41 | /* Make sure that /system isn't mounted yet. |
| 42 | */ |
| 43 | if (file_exists(CANARY_FILE)) return -__LINE__; |
| 44 | if (is_root_path_mounted(CANARY_FILE_ROOT_PATH)) return -__LINE__; |
| 45 | |
| 46 | /* Try to mount the root. |
| 47 | */ |
| 48 | ret = ensure_root_path_mounted(CANARY_FILE_ROOT_PATH); |
| 49 | if (ret < 0) return -__LINE__; |
| 50 | |
| 51 | /* Make sure we can see the file now and that we know the root is mounted. |
| 52 | */ |
| 53 | if (!file_exists(CANARY_FILE)) return -__LINE__; |
| 54 | if (!is_root_path_mounted(CANARY_FILE_ROOT_PATH)) return -__LINE__; |
| 55 | |
| 56 | /* Make sure that the root path corresponds to the regular path. |
| 57 | */ |
| 58 | struct stat st1, st2; |
| 59 | char buf[128]; |
| 60 | const char *path = translate_root_path(CANARY_FILE_ROOT_PATH, |
| 61 | buf, sizeof(buf)); |
| 62 | if (path == NULL) return -__LINE__; |
| 63 | ret = stat(CANARY_FILE, &st1); |
| 64 | if (ret != 0) return -__LINE__; |
| 65 | ret = stat(path, &st2); |
| 66 | if (ret != 0) return -__LINE__; |
| 67 | if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino) return -__LINE__; |
| 68 | |
| 69 | /* Try to unmount the root. |
| 70 | */ |
| 71 | ret = ensure_root_path_unmounted(CANARY_FILE_ROOT_PATH); |
| 72 | if (ret < 0) return -__LINE__; |
| 73 | |
| 74 | /* Make sure that we can't see the file anymore and that |
| 75 | * we don't think the root is mounted. |
| 76 | */ |
| 77 | if (file_exists(CANARY_FILE)) return -__LINE__; |
| 78 | if (is_root_path_mounted(CANARY_FILE_ROOT_PATH)) return -__LINE__; |
| 79 | |
| 80 | return 0; |
| 81 | } |