Doug Zongker | aad1acc | 2014-06-16 09:07:44 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 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 <stdio.h> |
| 18 | #include <string.h> |
| 19 | #include <errno.h> |
| 20 | #include <limits.h> |
| 21 | #include <stdlib.h> |
| 22 | |
| 23 | #include "private/android_filesystem_config.h" |
| 24 | |
| 25 | #include "canned_fs_config.h" |
| 26 | |
| 27 | typedef struct { |
| 28 | const char* path; |
| 29 | unsigned uid; |
| 30 | unsigned gid; |
| 31 | unsigned mode; |
| 32 | uint64_t capabilities; |
| 33 | } Path; |
| 34 | |
| 35 | static Path* canned_data = NULL; |
| 36 | static int canned_alloc = 0; |
| 37 | static int canned_used = 0; |
| 38 | |
| 39 | static int path_compare(const void* a, const void* b) { |
| 40 | return strcmp(((Path*)a)->path, ((Path*)b)->path); |
| 41 | } |
| 42 | |
| 43 | int load_canned_fs_config(const char* fn) { |
| 44 | FILE* f = fopen(fn, "r"); |
| 45 | if (f == NULL) { |
| 46 | fprintf(stderr, "failed to open %s: %s\n", fn, strerror(errno)); |
| 47 | return -1; |
| 48 | } |
| 49 | |
| 50 | char line[PATH_MAX + 200]; |
| 51 | while (fgets(line, sizeof(line), f)) { |
| 52 | while (canned_used >= canned_alloc) { |
| 53 | canned_alloc = (canned_alloc+1) * 2; |
| 54 | canned_data = (Path*) realloc(canned_data, canned_alloc * sizeof(Path)); |
| 55 | } |
| 56 | Path* p = canned_data + canned_used; |
| 57 | p->path = strdup(strtok(line, " ")); |
| 58 | p->uid = atoi(strtok(NULL, " ")); |
| 59 | p->gid = atoi(strtok(NULL, " ")); |
| 60 | p->mode = strtol(strtok(NULL, " "), NULL, 8); // mode is in octal |
| 61 | p->capabilities = 0; |
| 62 | |
| 63 | char* token = NULL; |
| 64 | do { |
| 65 | token = strtok(NULL, " "); |
| 66 | if (token && strncmp(token, "capabilities=", 13) == 0) { |
| 67 | p->capabilities = strtoll(token+13, NULL, 0); |
| 68 | break; |
| 69 | } |
| 70 | } while (token); |
| 71 | |
| 72 | canned_used++; |
| 73 | } |
| 74 | |
| 75 | fclose(f); |
| 76 | |
| 77 | qsort(canned_data, canned_used, sizeof(Path), path_compare); |
Doug Zongker | 1402741 | 2014-06-17 09:32:14 -0700 | [diff] [blame] | 78 | printf("loaded %d fs_config entries\n", canned_used); |
Doug Zongker | aad1acc | 2014-06-16 09:07:44 -0700 | [diff] [blame] | 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
Thierry Strudel | b89e81d | 2015-07-09 16:31:39 -0700 | [diff] [blame] | 83 | void canned_fs_config(const char* path, int dir, const char* target_out_path, |
Doug Zongker | aad1acc | 2014-06-16 09:07:44 -0700 | [diff] [blame] | 84 | unsigned* uid, unsigned* gid, unsigned* mode, uint64_t* capabilities) { |
| 85 | Path key; |
| 86 | key.path = path+1; // canned paths lack the leading '/' |
| 87 | Path* p = (Path*) bsearch(&key, canned_data, canned_used, sizeof(Path), path_compare); |
| 88 | if (p == NULL) { |
| 89 | fprintf(stderr, "failed to find [%s] in canned fs_config\n", path); |
| 90 | exit(1); |
| 91 | } |
| 92 | *uid = p->uid; |
| 93 | *gid = p->gid; |
| 94 | *mode = p->mode; |
| 95 | *capabilities = p->capabilities; |
| 96 | |
| 97 | #if 0 |
| 98 | // for debugging, run the built-in fs_config and compare the results. |
| 99 | |
| 100 | unsigned c_uid, c_gid, c_mode; |
| 101 | uint64_t c_capabilities; |
Thierry Strudel | b89e81d | 2015-07-09 16:31:39 -0700 | [diff] [blame] | 102 | fs_config(path, dir, target_out_path, &c_uid, &c_gid, &c_mode, &c_capabilities); |
Doug Zongker | aad1acc | 2014-06-16 09:07:44 -0700 | [diff] [blame] | 103 | |
| 104 | if (c_uid != *uid) printf("%s uid %d %d\n", path, *uid, c_uid); |
| 105 | if (c_gid != *gid) printf("%s gid %d %d\n", path, *gid, c_gid); |
| 106 | if (c_mode != *mode) printf("%s mode 0%o 0%o\n", path, *mode, c_mode); |
| 107 | if (c_capabilities != *capabilities) printf("%s capabilities %llx %llx\n", path, *capabilities, c_capabilities); |
| 108 | #endif |
| 109 | } |