Elliott Hughes | d32e7e2 | 2019-08-07 22:59:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2019 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 | #define LOG_TAG "packagelistparser" |
| 18 | |
| 19 | #include <packagelistparser/packagelistparser.h> |
| 20 | |
| 21 | #include <errno.h> |
| 22 | #include <inttypes.h> |
| 23 | #include <stdio.h> |
| 24 | #include <string.h> |
| 25 | #include <sys/limits.h> |
| 26 | |
| 27 | #include <memory> |
| 28 | |
| 29 | #include <log/log.h> |
| 30 | |
| 31 | static bool parse_gids(const char* path, size_t line_number, const char* gids, pkg_info* info) { |
| 32 | // Nothing to do? |
| 33 | if (!gids || !strcmp(gids, "none")) return true; |
| 34 | |
| 35 | // How much space do we need? |
| 36 | info->gids.cnt = 1; |
| 37 | for (const char* p = gids; *p; ++p) { |
| 38 | if (*p == ',') ++info->gids.cnt; |
| 39 | } |
| 40 | |
| 41 | // Allocate the space. |
| 42 | info->gids.gids = new gid_t[info->gids.cnt]; |
| 43 | if (!info->gids.gids) return false; |
| 44 | |
| 45 | // And parse the individual gids. |
| 46 | size_t i = 0; |
| 47 | while (true) { |
| 48 | char* end; |
| 49 | unsigned long gid = strtoul(gids, &end, 10); |
| 50 | if (gid > GID_MAX) { |
| 51 | ALOGE("%s:%zu: gid %lu > GID_MAX", path, line_number, gid); |
| 52 | return false; |
| 53 | } |
| 54 | |
| 55 | if (i >= info->gids.cnt) return false; |
| 56 | info->gids.gids[i++] = gid; |
| 57 | |
| 58 | if (*end == '\0') return true; |
| 59 | if (*end != ',') return false; |
| 60 | gids = end + 1; |
| 61 | } |
| 62 | return true; |
| 63 | } |
| 64 | |
| 65 | static bool parse_line(const char* path, size_t line_number, const char* line, pkg_info* info) { |
| 66 | unsigned long uid; |
| 67 | int debuggable; |
| 68 | char* gid_list; |
| 69 | int profileable_from_shell = 0; |
| 70 | |
| 71 | int fields = |
| 72 | sscanf(line, "%ms %lu %d %ms %ms %ms %d %ld", &info->name, &uid, &debuggable, &info->data_dir, |
| 73 | &info->seinfo, &gid_list, &profileable_from_shell, &info->version_code); |
| 74 | |
| 75 | // Handle the more complicated gids field and free the temporary string. |
| 76 | bool gids_okay = parse_gids(path, line_number, gid_list, info); |
| 77 | free(gid_list); |
| 78 | if (!gids_okay) return false; |
| 79 | |
| 80 | // Did we see enough fields to be getting on with? |
| 81 | // The final fields are optional (and not usually present). |
| 82 | if (fields < 6) { |
| 83 | ALOGE("%s:%zu: too few fields in line", path, line_number); |
| 84 | return false; |
| 85 | } |
| 86 | |
| 87 | // Extra validation. |
| 88 | if (uid > UID_MAX) { |
| 89 | ALOGE("%s:%zu: uid %lu > UID_MAX", path, line_number, uid); |
| 90 | return false; |
| 91 | } |
| 92 | info->uid = uid; |
| 93 | |
| 94 | // Integer to bool conversions. |
Elliott Hughes | d32e7e2 | 2019-08-07 22:59:00 -0700 | [diff] [blame] | 95 | info->debuggable = debuggable; |
Elliott Hughes | d32e7e2 | 2019-08-07 22:59:00 -0700 | [diff] [blame] | 96 | info->profileable_from_shell = profileable_from_shell; |
| 97 | |
| 98 | return true; |
| 99 | } |
| 100 | |
| 101 | bool packagelist_parse_file(const char* path, bool (*callback)(pkg_info*, void*), void* user_data) { |
| 102 | std::unique_ptr<FILE, decltype(&fclose)> fp(fopen(path, "re"), &fclose); |
| 103 | if (!fp) { |
| 104 | ALOGE("couldn't open '%s': %s", path, strerror(errno)); |
| 105 | return false; |
| 106 | } |
| 107 | |
| 108 | size_t line_number = 0; |
| 109 | char* line = nullptr; |
| 110 | size_t allocated_length = 0; |
| 111 | while (getline(&line, &allocated_length, fp.get()) > 0) { |
| 112 | ++line_number; |
| 113 | std::unique_ptr<pkg_info, decltype(&packagelist_free)> info( |
| 114 | static_cast<pkg_info*>(calloc(1, sizeof(pkg_info))), &packagelist_free); |
| 115 | if (!info) { |
| 116 | ALOGE("%s:%zu: couldn't allocate pkg_info", path, line_number); |
| 117 | return false; |
| 118 | } |
| 119 | |
| 120 | if (!parse_line(path, line_number, line, info.get())) return false; |
| 121 | |
| 122 | if (!callback(info.release(), user_data)) break; |
| 123 | } |
| 124 | free(line); |
| 125 | return true; |
| 126 | } |
| 127 | |
| 128 | bool packagelist_parse(bool (*callback)(pkg_info*, void*), void* user_data) { |
| 129 | return packagelist_parse_file("/data/system/packages.list", callback, user_data); |
| 130 | } |
| 131 | |
| 132 | void packagelist_free(pkg_info* info) { |
| 133 | if (!info) return; |
| 134 | |
| 135 | free(info->name); |
| 136 | free(info->data_dir); |
| 137 | free(info->seinfo); |
| 138 | delete[] info->gids.gids; |
| 139 | free(info); |
| 140 | } |