Andreas Gampe | 438eb75 | 2015-10-22 19:51:51 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2015, Intel Corporation |
| 3 | * Copyright (C) 2015 The Android Open Source Project |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | * Written by William Roberts <william.c.roberts@intel.com> |
| 18 | * |
| 19 | */ |
| 20 | |
| 21 | #include <errno.h> |
| 22 | #include <stdbool.h> |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | |
| 27 | #include <sys/limits.h> |
| 28 | |
| 29 | #define LOG_TAG "packagelistparser" |
| 30 | #include <utils/Log.h> |
| 31 | |
Colin Cross | 7f68acb | 2015-11-04 17:05:24 -0800 | [diff] [blame^] | 32 | #include <packagelistparser/packagelistparser.h> |
Andreas Gampe | 438eb75 | 2015-10-22 19:51:51 -0700 | [diff] [blame] | 33 | |
| 34 | #define CLOGE(fmt, ...) \ |
| 35 | do {\ |
| 36 | IF_ALOGE() {\ |
| 37 | ALOGE(fmt, ##__VA_ARGS__);\ |
| 38 | }\ |
| 39 | } while(0) |
| 40 | |
| 41 | static size_t get_gid_cnt(const char *gids) |
| 42 | { |
| 43 | size_t cnt; |
| 44 | |
| 45 | if (*gids == '\0') { |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | if (!strcmp(gids, "none")) { |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | for (cnt = 1; gids[cnt]; gids[cnt] == ',' ? cnt++ : *gids++) |
| 54 | ; |
| 55 | |
| 56 | return cnt; |
| 57 | } |
| 58 | |
| 59 | static bool parse_gids(char *gids, gid_t *gid_list, size_t *cnt) |
| 60 | { |
| 61 | gid_t gid; |
| 62 | char* token; |
| 63 | char *endptr; |
| 64 | size_t cmp = 0; |
| 65 | |
| 66 | while ((token = strsep(&gids, ",\r\n"))) { |
| 67 | |
| 68 | if (cmp > *cnt) { |
| 69 | return false; |
| 70 | } |
| 71 | |
| 72 | gid = strtoul(token, &endptr, 10); |
| 73 | if (*endptr != '\0') { |
| 74 | return false; |
| 75 | } |
| 76 | |
| 77 | /* |
| 78 | * if unsigned long is greater than size of gid_t, |
| 79 | * prevent a truncation based roll-over |
| 80 | */ |
| 81 | if (gid > GID_MAX) { |
| 82 | CLOGE("A gid in field \"gid list\" greater than GID_MAX"); |
| 83 | return false; |
| 84 | } |
| 85 | |
| 86 | gid_list[cmp++] = gid; |
| 87 | } |
| 88 | return true; |
| 89 | } |
| 90 | |
| 91 | extern bool packagelist_parse(pfn_on_package callback, void *userdata) |
| 92 | { |
| 93 | |
| 94 | FILE *fp; |
| 95 | char *cur; |
| 96 | char *next; |
| 97 | char *endptr; |
| 98 | unsigned long tmp; |
| 99 | ssize_t bytesread; |
| 100 | |
| 101 | bool rc = false; |
| 102 | char *buf = NULL; |
| 103 | size_t buflen = 0; |
| 104 | unsigned long lineno = 1; |
| 105 | const char *errmsg = NULL; |
| 106 | struct pkg_info *pkg_info = NULL; |
| 107 | |
| 108 | fp = fopen(PACKAGES_LIST_FILE, "re"); |
| 109 | if (!fp) { |
| 110 | CLOGE("Could not open: \"%s\", error: \"%s\"\n", PACKAGES_LIST_FILE, |
| 111 | strerror(errno)); |
| 112 | return false; |
| 113 | } |
| 114 | |
| 115 | while ((bytesread = getline(&buf, &buflen, fp)) > 0) { |
| 116 | |
| 117 | pkg_info = calloc(1, sizeof(*pkg_info)); |
| 118 | if (!pkg_info) { |
| 119 | goto err; |
| 120 | } |
| 121 | |
| 122 | next = buf; |
| 123 | |
| 124 | cur = strsep(&next, " \t\r\n"); |
| 125 | if (!cur) { |
| 126 | errmsg = "Could not get next token for \"package name\""; |
| 127 | goto err; |
| 128 | } |
| 129 | |
| 130 | pkg_info->name = strdup(cur); |
| 131 | if (!pkg_info->name) { |
| 132 | goto err; |
| 133 | } |
| 134 | |
| 135 | cur = strsep(&next, " \t\r\n"); |
| 136 | if (!cur) { |
| 137 | errmsg = "Could not get next token for field \"uid\""; |
| 138 | goto err; |
| 139 | } |
| 140 | |
| 141 | tmp = strtoul(cur, &endptr, 10); |
| 142 | if (*endptr != '\0') { |
| 143 | errmsg = "Could not convert field \"uid\" to integer value"; |
| 144 | goto err; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * if unsigned long is greater than size of uid_t, |
| 149 | * prevent a truncation based roll-over |
| 150 | */ |
| 151 | if (tmp > UID_MAX) { |
| 152 | errmsg = "Field \"uid\" greater than UID_MAX"; |
| 153 | goto err; |
| 154 | } |
| 155 | |
| 156 | pkg_info->uid = (uid_t) tmp; |
| 157 | |
| 158 | cur = strsep(&next, " \t\r\n"); |
| 159 | if (!cur) { |
| 160 | errmsg = "Could not get next token for field \"debuggable\""; |
| 161 | goto err; |
| 162 | } |
| 163 | |
| 164 | tmp = strtoul(cur, &endptr, 10); |
| 165 | if (*endptr != '\0') { |
| 166 | errmsg = "Could not convert field \"debuggable\" to integer value"; |
| 167 | goto err; |
| 168 | } |
| 169 | |
| 170 | /* should be a valid boolean of 1 or 0 */ |
| 171 | if (!(tmp == 0 || tmp == 1)) { |
| 172 | errmsg = "Field \"debuggable\" is not 0 or 1 boolean value"; |
| 173 | goto err; |
| 174 | } |
| 175 | |
| 176 | pkg_info->debuggable = (bool) tmp; |
| 177 | |
| 178 | cur = strsep(&next, " \t\r\n"); |
| 179 | if (!cur) { |
| 180 | errmsg = "Could not get next token for field \"data dir\""; |
| 181 | goto err; |
| 182 | } |
| 183 | |
| 184 | pkg_info->data_dir = strdup(cur); |
| 185 | if (!pkg_info->data_dir) { |
| 186 | goto err; |
| 187 | } |
| 188 | |
| 189 | cur = strsep(&next, " \t\r\n"); |
| 190 | if (!cur) { |
| 191 | errmsg = "Could not get next token for field \"seinfo\""; |
| 192 | goto err; |
| 193 | } |
| 194 | |
| 195 | pkg_info->seinfo = strdup(cur); |
| 196 | if (!pkg_info->seinfo) { |
| 197 | goto err; |
| 198 | } |
| 199 | |
| 200 | cur = strsep(&next, " \t\r\n"); |
| 201 | if (!cur) { |
| 202 | errmsg = "Could not get next token for field \"gid(s)\""; |
| 203 | goto err; |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | * Parse the gid list, could be in the form of none, single gid or list: |
| 208 | * none |
| 209 | * gid |
| 210 | * gid, gid ... |
| 211 | */ |
| 212 | pkg_info->gids.cnt = get_gid_cnt(cur); |
| 213 | if (pkg_info->gids.cnt > 0) { |
| 214 | |
| 215 | pkg_info->gids.gids = calloc(pkg_info->gids.cnt, sizeof(gid_t)); |
| 216 | if (!pkg_info->gids.gids) { |
| 217 | goto err; |
| 218 | } |
| 219 | |
| 220 | rc = parse_gids(cur, pkg_info->gids.gids, &pkg_info->gids.cnt); |
| 221 | if (!rc) { |
| 222 | errmsg = "Could not parse field \"gid list\""; |
| 223 | goto err; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | rc = callback(pkg_info, userdata); |
| 228 | if (rc == false) { |
| 229 | /* |
| 230 | * We do not log this as this can be intentional from |
| 231 | * callback to abort processing. We go to out to not |
| 232 | * free the pkg_info |
| 233 | */ |
| 234 | rc = true; |
| 235 | goto out; |
| 236 | } |
| 237 | lineno++; |
| 238 | } |
| 239 | |
| 240 | rc = true; |
| 241 | |
| 242 | out: |
| 243 | free(buf); |
| 244 | fclose(fp); |
| 245 | return rc; |
| 246 | |
| 247 | err: |
| 248 | if (errmsg) { |
| 249 | CLOGE("Error Parsing \"%s\" on line: %lu for reason: %s", |
| 250 | PACKAGES_LIST_FILE, lineno, errmsg); |
| 251 | } |
| 252 | rc = false; |
| 253 | packagelist_free(pkg_info); |
| 254 | goto out; |
| 255 | } |
| 256 | |
| 257 | void packagelist_free(pkg_info *info) |
| 258 | { |
| 259 | if (info) { |
| 260 | free(info->name); |
| 261 | free(info->data_dir); |
| 262 | free(info->seinfo); |
| 263 | free(info->gids.gids); |
| 264 | free(info); |
| 265 | } |
| 266 | } |