The Android Open Source Project | 23580ca | 2008-10-21 07:00:00 -0700 | [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 <stdlib.h> |
| 18 | #include <stdio.h> |
| 19 | #include <string.h> |
| 20 | #undef NDEBUG |
| 21 | #include <assert.h> |
| 22 | #include "commands.h" |
| 23 | |
| 24 | #include "register.h" |
| 25 | |
| 26 | #define UNUSED(p) ((void)(p)) |
| 27 | |
| 28 | #define CHECK_BOOL() \ |
| 29 | do { \ |
| 30 | assert(argv == NULL); \ |
| 31 | if (argv != NULL) return -1; \ |
| 32 | assert(argc == true || argc == false); \ |
| 33 | if (argc != true && argc != false) return -1; \ |
| 34 | } while (false) |
| 35 | |
| 36 | #define CHECK_WORDS() \ |
| 37 | do { \ |
| 38 | assert(argc >= 0); \ |
| 39 | if (argc < 0) return -1; \ |
| 40 | assert(argc == 0 || argv != NULL); \ |
| 41 | if (argc != 0 && argv == NULL) return -1; \ |
| 42 | if (permissions != NULL) { \ |
| 43 | int CW_I_; \ |
| 44 | for (CW_I_ = 0; CW_I_ < argc; CW_I_++) { \ |
| 45 | assert(argv[CW_I_] != NULL); \ |
| 46 | if (argv[CW_I_] == NULL) return -1; \ |
| 47 | } \ |
| 48 | } \ |
| 49 | } while (false) |
| 50 | |
| 51 | #define CHECK_FN() \ |
| 52 | do { \ |
| 53 | CHECK_WORDS(); \ |
| 54 | if (permissions != NULL) { \ |
| 55 | assert(result == NULL); \ |
| 56 | if (result != NULL) return -1; \ |
| 57 | } else { \ |
| 58 | assert(result != NULL); \ |
| 59 | if (result == NULL) return -1; \ |
| 60 | } \ |
| 61 | } while (false) |
| 62 | |
| 63 | #define NO_PERMS(perms) \ |
| 64 | do { \ |
| 65 | PermissionRequestList *NP_PRL_ = (perms); \ |
| 66 | if (NP_PRL_ != NULL) { \ |
| 67 | int NP_RET_ = addPermissionRequestToList(NP_PRL_, \ |
| 68 | "", false, PERM_NONE); \ |
| 69 | if (NP_RET_ < 0) { \ |
| 70 | /* Returns from the calling function. \ |
| 71 | */ \ |
| 72 | return NP_RET_; \ |
| 73 | } \ |
| 74 | } \ |
| 75 | } while (false) |
| 76 | |
| 77 | /* |
| 78 | * Command definitions |
| 79 | */ |
| 80 | |
| 81 | /* assert <boolexpr> |
| 82 | */ |
| 83 | static int |
| 84 | cmd_assert(const char *name, void *cookie, int argc, const char *argv[], |
| 85 | PermissionRequestList *permissions) |
| 86 | { |
| 87 | UNUSED(name); |
| 88 | UNUSED(cookie); |
| 89 | CHECK_BOOL(); |
| 90 | NO_PERMS(permissions); |
| 91 | |
| 92 | /* If our argument is false, return non-zero (failure) |
| 93 | * If our argument is true, return zero (success) |
| 94 | */ |
| 95 | if (argc) { |
| 96 | return 0; |
| 97 | } else { |
| 98 | return 1; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /* format <root> |
| 103 | */ |
| 104 | static int |
| 105 | cmd_format(const char *name, void *cookie, int argc, const char *argv[], |
| 106 | PermissionRequestList *permissions) |
| 107 | { |
| 108 | UNUSED(name); |
| 109 | UNUSED(cookie); |
| 110 | CHECK_WORDS(); |
| 111 | //xxx |
| 112 | return -1; |
| 113 | } |
| 114 | |
| 115 | /* copy_dir <srcdir> <dstdir> |
| 116 | */ |
| 117 | static int |
| 118 | cmd_copy_dir(const char *name, void *cookie, int argc, const char *argv[], |
| 119 | PermissionRequestList *permissions) |
| 120 | { |
| 121 | UNUSED(name); |
| 122 | UNUSED(cookie); |
| 123 | CHECK_WORDS(); |
| 124 | //xxx |
| 125 | return -1; |
| 126 | } |
| 127 | |
| 128 | /* mark <resource> dirty|clean |
| 129 | */ |
| 130 | static int |
| 131 | cmd_mark(const char *name, void *cookie, int argc, const char *argv[], |
| 132 | PermissionRequestList *permissions) |
| 133 | { |
| 134 | UNUSED(name); |
| 135 | UNUSED(cookie); |
| 136 | CHECK_WORDS(); |
| 137 | //xxx when marking, save the top-level hash at the mark point |
| 138 | // so we can retry on failure. Otherwise the hashes won't match, |
| 139 | // or someone could intentionally dirty the FS to force a downgrade |
| 140 | //xxx |
| 141 | return -1; |
| 142 | } |
| 143 | |
| 144 | /* done |
| 145 | */ |
| 146 | static int |
| 147 | cmd_done(const char *name, void *cookie, int argc, const char *argv[], |
| 148 | PermissionRequestList *permissions) |
| 149 | { |
| 150 | UNUSED(name); |
| 151 | UNUSED(cookie); |
| 152 | CHECK_WORDS(); |
| 153 | //xxx |
| 154 | return -1; |
| 155 | } |
| 156 | |
| 157 | int |
| 158 | registerUpdateCommands() |
| 159 | { |
| 160 | int ret; |
| 161 | |
| 162 | ret = registerCommand("assert", CMD_ARGS_BOOLEAN, cmd_assert, NULL); |
| 163 | if (ret < 0) return ret; |
| 164 | |
| 165 | ret = registerCommand("copy_dir", CMD_ARGS_WORDS, cmd_copy_dir, NULL); |
| 166 | if (ret < 0) return ret; |
| 167 | |
| 168 | ret = registerCommand("format", CMD_ARGS_WORDS, cmd_format, NULL); |
| 169 | if (ret < 0) return ret; |
| 170 | |
| 171 | ret = registerCommand("mark", CMD_ARGS_WORDS, cmd_mark, NULL); |
| 172 | if (ret < 0) return ret; |
| 173 | |
| 174 | ret = registerCommand("done", CMD_ARGS_WORDS, cmd_done, NULL); |
| 175 | if (ret < 0) return ret; |
| 176 | |
| 177 | //xxx some way to fix permissions |
| 178 | //xxx could have "installperms" commands that build the fs_config list |
| 179 | //xxx along with a "commitperms", and any copy_dir etc. needs to see |
| 180 | // a commitperms before it will work |
| 181 | |
| 182 | return 0; |
| 183 | } |
| 184 | |
| 185 | |
| 186 | /* |
| 187 | * Function definitions |
| 188 | */ |
| 189 | |
| 190 | /* update_forced() |
| 191 | * |
| 192 | * Returns "true" if some system setting has determined that |
| 193 | * the update should happen no matter what. |
| 194 | */ |
| 195 | static int |
| 196 | fn_update_forced(const char *name, void *cookie, int argc, const char *argv[], |
| 197 | char **result, size_t *resultLen, |
| 198 | PermissionRequestList *permissions) |
| 199 | { |
| 200 | UNUSED(name); |
| 201 | UNUSED(cookie); |
| 202 | CHECK_FN(); |
| 203 | NO_PERMS(permissions); |
| 204 | |
| 205 | if (argc != 0) { |
| 206 | fprintf(stderr, "%s: wrong number of arguments (%d)\n", |
| 207 | name, argc); |
| 208 | return 1; |
| 209 | } |
| 210 | |
| 211 | //xxx check some global or property |
| 212 | bool force = true; |
| 213 | if (force) { |
| 214 | *result = strdup("true"); |
| 215 | } else { |
| 216 | *result = strdup(""); |
| 217 | } |
| 218 | if (resultLen != NULL) { |
| 219 | *resultLen = strlen(*result); |
| 220 | } |
| 221 | |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | /* get_mark(<resource>) |
| 226 | * |
| 227 | * Returns the current mark associated with the provided resource. |
| 228 | */ |
| 229 | static int |
| 230 | fn_get_mark(const char *name, void *cookie, int argc, const char *argv[], |
| 231 | char **result, size_t *resultLen, |
| 232 | PermissionRequestList *permissions) |
| 233 | { |
| 234 | UNUSED(name); |
| 235 | UNUSED(cookie); |
| 236 | CHECK_FN(); |
| 237 | NO_PERMS(permissions); |
| 238 | |
| 239 | if (argc != 1) { |
| 240 | fprintf(stderr, "%s: wrong number of arguments (%d)\n", |
| 241 | name, argc); |
| 242 | return 1; |
| 243 | } |
| 244 | |
| 245 | //xxx look up the value |
| 246 | *result = strdup(""); |
| 247 | if (resultLen != NULL) { |
| 248 | *resultLen = strlen(*result); |
| 249 | } |
| 250 | |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | /* hash_dir(<path-to-directory>) |
| 255 | */ |
| 256 | static int |
| 257 | fn_hash_dir(const char *name, void *cookie, int argc, const char *argv[], |
| 258 | char **result, size_t *resultLen, |
| 259 | PermissionRequestList *permissions) |
| 260 | { |
| 261 | int ret = -1; |
| 262 | |
| 263 | UNUSED(name); |
| 264 | UNUSED(cookie); |
| 265 | CHECK_FN(); |
| 266 | |
| 267 | const char *dir; |
| 268 | if (argc != 1) { |
| 269 | fprintf(stderr, "%s: wrong number of arguments (%d)\n", |
| 270 | name, argc); |
| 271 | return 1; |
| 272 | } else { |
| 273 | dir = argv[0]; |
| 274 | } |
| 275 | |
| 276 | if (permissions != NULL) { |
| 277 | if (dir == NULL) { |
| 278 | /* The argument is the result of another function. |
| 279 | * Assume the worst case, where the function returns |
| 280 | * the root. |
| 281 | */ |
| 282 | dir = "/"; |
| 283 | } |
| 284 | ret = addPermissionRequestToList(permissions, dir, true, PERM_READ); |
| 285 | } else { |
| 286 | //xxx build and return the string |
| 287 | *result = strdup("hashvalue"); |
| 288 | if (resultLen != NULL) { |
| 289 | *resultLen = strlen(*result); |
| 290 | } |
| 291 | ret = 0; |
| 292 | } |
| 293 | |
| 294 | return ret; |
| 295 | } |
| 296 | |
| 297 | /* matches(<str>, <str1> [, <strN>...]) |
| 298 | * If <str> matches (strcmp) any of <str1>...<strN>, returns <str>, |
| 299 | * otherwise returns "". |
| 300 | * |
| 301 | * E.g., assert matches(hash_dir("/path"), "hash1", "hash2") |
| 302 | */ |
| 303 | static int |
| 304 | fn_matches(const char *name, void *cookie, int argc, const char *argv[], |
| 305 | char **result, size_t *resultLen, |
| 306 | PermissionRequestList *permissions) |
| 307 | { |
| 308 | UNUSED(name); |
| 309 | UNUSED(cookie); |
| 310 | CHECK_FN(); |
| 311 | NO_PERMS(permissions); |
| 312 | |
| 313 | if (argc < 2) { |
| 314 | fprintf(stderr, "%s: not enough arguments (%d < 2)\n", |
| 315 | name, argc); |
| 316 | return 1; |
| 317 | } |
| 318 | |
| 319 | int i; |
| 320 | for (i = 1; i < argc; i++) { |
| 321 | if (strcmp(argv[0], argv[i]) == 0) { |
| 322 | *result = strdup(argv[0]); |
| 323 | if (resultLen != NULL) { |
| 324 | *resultLen = strlen(*result); |
| 325 | } |
| 326 | return 0; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | *result = strdup(""); |
| 331 | if (resultLen != NULL) { |
| 332 | *resultLen = 1; |
| 333 | } |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | /* concat(<str>, <str1> [, <strN>...]) |
| 338 | * Returns the concatenation of all strings. |
| 339 | */ |
| 340 | static int |
| 341 | fn_concat(const char *name, void *cookie, int argc, const char *argv[], |
| 342 | char **result, size_t *resultLen, |
| 343 | PermissionRequestList *permissions) |
| 344 | { |
| 345 | UNUSED(name); |
| 346 | UNUSED(cookie); |
| 347 | CHECK_FN(); |
| 348 | NO_PERMS(permissions); |
| 349 | |
| 350 | size_t totalLen = 0; |
| 351 | int i; |
| 352 | for (i = 0; i < argc; i++) { |
| 353 | totalLen += strlen(argv[i]); |
| 354 | } |
| 355 | |
| 356 | char *s = (char *)malloc(totalLen + 1); |
| 357 | if (s == NULL) { |
| 358 | return -1; |
| 359 | } |
| 360 | s[totalLen] = '\0'; |
| 361 | for (i = 0; i < argc; i++) { |
| 362 | //TODO: keep track of the end to avoid walking the string each time |
| 363 | strcat(s, argv[i]); |
| 364 | } |
| 365 | *result = s; |
| 366 | if (resultLen != NULL) { |
| 367 | *resultLen = strlen(s); |
| 368 | } |
| 369 | |
| 370 | return 0; |
| 371 | } |
| 372 | |
| 373 | int |
| 374 | registerUpdateFunctions() |
| 375 | { |
| 376 | int ret; |
| 377 | |
| 378 | ret = registerFunction("update_forced", fn_update_forced, NULL); |
| 379 | if (ret < 0) return ret; |
| 380 | |
| 381 | ret = registerFunction("get_mark", fn_get_mark, NULL); |
| 382 | if (ret < 0) return ret; |
| 383 | |
| 384 | ret = registerFunction("hash_dir", fn_hash_dir, NULL); |
| 385 | if (ret < 0) return ret; |
| 386 | |
| 387 | ret = registerFunction("matches", fn_matches, NULL); |
| 388 | if (ret < 0) return ret; |
| 389 | |
| 390 | ret = registerFunction("concat", fn_concat, NULL); |
| 391 | if (ret < 0) return ret; |
| 392 | |
| 393 | return 0; |
| 394 | } |