| File: | src/redis-check-rdb.c |
| Warning: | line 287, column 18 Although the value stored to 'when' is used in the enclosing expression, the value is never actually read from 'when' |
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| 1 | /* |
| 2 | * Copyright (c) 2016, Salvatore Sanfilippo <antirez at gmail dot com> |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions are met: |
| 7 | * |
| 8 | * * Redistributions of source code must retain the above copyright notice, |
| 9 | * this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * * Neither the name of Redis nor the names of its contributors may be used |
| 14 | * to endorse or promote products derived from this software without |
| 15 | * specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 18 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 21 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 22 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 23 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 24 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 25 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 26 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 27 | * POSSIBILITY OF SUCH DAMAGE. |
| 28 | */ |
| 29 | |
| 30 | #include "mt19937-64.h" |
| 31 | #include "server.h" |
| 32 | #include "rdb.h" |
| 33 | |
| 34 | #include <stdarg.h> |
| 35 | #include <sys/time.h> |
| 36 | #include <unistd.h> |
| 37 | |
| 38 | void createSharedObjects(void); |
| 39 | void rdbLoadProgressCallback(rio *r, const void *buf, size_t len); |
| 40 | int rdbCheckMode = 0; |
| 41 | |
| 42 | struct { |
| 43 | rio *rio; |
| 44 | robj *key; /* Current key we are reading. */ |
| 45 | int key_type; /* Current key type if != -1. */ |
| 46 | unsigned long keys; /* Number of keys processed. */ |
| 47 | unsigned long expires; /* Number of keys with an expire. */ |
| 48 | unsigned long already_expired; /* Number of keys already expired. */ |
| 49 | int doing; /* The state while reading the RDB. */ |
| 50 | int error_set; /* True if error is populated. */ |
| 51 | char error[1024]; |
| 52 | } rdbstate; |
| 53 | |
| 54 | /* At every loading step try to remember what we were about to do, so that |
| 55 | * we can log this information when an error is encountered. */ |
| 56 | #define RDB_CHECK_DOING_START0 0 |
| 57 | #define RDB_CHECK_DOING_READ_TYPE1 1 |
| 58 | #define RDB_CHECK_DOING_READ_EXPIRE2 2 |
| 59 | #define RDB_CHECK_DOING_READ_KEY3 3 |
| 60 | #define RDB_CHECK_DOING_READ_OBJECT_VALUE4 4 |
| 61 | #define RDB_CHECK_DOING_CHECK_SUM5 5 |
| 62 | #define RDB_CHECK_DOING_READ_LEN6 6 |
| 63 | #define RDB_CHECK_DOING_READ_AUX7 7 |
| 64 | #define RDB_CHECK_DOING_READ_MODULE_AUX8 8 |
| 65 | |
| 66 | char *rdb_check_doing_string[] = { |
| 67 | "start", |
| 68 | "read-type", |
| 69 | "read-expire", |
| 70 | "read-key", |
| 71 | "read-object-value", |
| 72 | "check-sum", |
| 73 | "read-len", |
| 74 | "read-aux", |
| 75 | "read-module-aux" |
| 76 | }; |
| 77 | |
| 78 | char *rdb_type_string[] = { |
| 79 | "string", |
| 80 | "list-linked", |
| 81 | "set-hashtable", |
| 82 | "zset-v1", |
| 83 | "hash-hashtable", |
| 84 | "zset-v2", |
| 85 | "module-value", |
| 86 | "","", |
| 87 | "hash-zipmap", |
| 88 | "list-ziplist", |
| 89 | "set-intset", |
| 90 | "zset-ziplist", |
| 91 | "hash-ziplist", |
| 92 | "quicklist", |
| 93 | "stream" |
| 94 | }; |
| 95 | |
| 96 | /* Show a few stats collected into 'rdbstate' */ |
| 97 | void rdbShowGenericInfo(void) { |
| 98 | printf("[info] %lu keys read\n", rdbstate.keys); |
| 99 | printf("[info] %lu expires\n", rdbstate.expires); |
| 100 | printf("[info] %lu already expired\n", rdbstate.already_expired); |
| 101 | } |
| 102 | |
| 103 | /* Called on RDB errors. Provides details about the RDB and the offset |
| 104 | * we were when the error was detected. */ |
| 105 | void rdbCheckError(const char *fmt, ...) { |
| 106 | char msg[1024]; |
| 107 | va_list ap; |
| 108 | |
| 109 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
| 110 | vsnprintf(msg, sizeof(msg), fmt, ap); |
| 111 | va_end(ap)__builtin_va_end(ap); |
| 112 | |
| 113 | printf("--- RDB ERROR DETECTED ---\n"); |
| 114 | printf("[offset %llu] %s\n", |
| 115 | (unsigned long long) (rdbstate.rio ? |
| 116 | rdbstate.rio->processed_bytes : 0), msg); |
| 117 | printf("[additional info] While doing: %s\n", |
| 118 | rdb_check_doing_string[rdbstate.doing]); |
| 119 | if (rdbstate.key) |
| 120 | printf("[additional info] Reading key '%s'\n", |
| 121 | (char*)rdbstate.key->ptr); |
| 122 | if (rdbstate.key_type != -1) |
| 123 | printf("[additional info] Reading type %d (%s)\n", |
| 124 | rdbstate.key_type, |
| 125 | ((unsigned)rdbstate.key_type < |
| 126 | sizeof(rdb_type_string)/sizeof(char*)) ? |
| 127 | rdb_type_string[rdbstate.key_type] : "unknown"); |
| 128 | rdbShowGenericInfo(); |
| 129 | } |
| 130 | |
| 131 | /* Print informations during RDB checking. */ |
| 132 | void rdbCheckInfo(const char *fmt, ...) { |
| 133 | char msg[1024]; |
| 134 | va_list ap; |
| 135 | |
| 136 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
| 137 | vsnprintf(msg, sizeof(msg), fmt, ap); |
| 138 | va_end(ap)__builtin_va_end(ap); |
| 139 | |
| 140 | printf("[offset %llu] %s\n", |
| 141 | (unsigned long long) (rdbstate.rio ? |
| 142 | rdbstate.rio->processed_bytes : 0), msg); |
| 143 | } |
| 144 | |
| 145 | /* Used inside rdb.c in order to log specific errors happening inside |
| 146 | * the RDB loading internals. */ |
| 147 | void rdbCheckSetError(const char *fmt, ...) { |
| 148 | va_list ap; |
| 149 | |
| 150 | va_start(ap, fmt)__builtin_va_start(ap, fmt); |
| 151 | vsnprintf(rdbstate.error, sizeof(rdbstate.error), fmt, ap); |
| 152 | va_end(ap)__builtin_va_end(ap); |
| 153 | rdbstate.error_set = 1; |
| 154 | } |
| 155 | |
| 156 | /* During RDB check we setup a special signal handler for memory violations |
| 157 | * and similar conditions, so that we can log the offending part of the RDB |
| 158 | * if the crash is due to broken content. */ |
| 159 | void rdbCheckHandleCrash(int sig, siginfo_t *info, void *secret) { |
| 160 | UNUSED(sig)((void) sig); |
| 161 | UNUSED(info)((void) info); |
| 162 | UNUSED(secret)((void) secret); |
| 163 | |
| 164 | rdbCheckError("Server crash checking the specified RDB file!"); |
| 165 | exit(1); |
| 166 | } |
| 167 | |
| 168 | void rdbCheckSetupSignals(void) { |
| 169 | struct sigaction act; |
| 170 | |
| 171 | sigemptyset(&act.sa_mask); |
| 172 | act.sa_flags = SA_NODEFER0x40000000 | SA_RESETHAND0x80000000 | SA_SIGINFO4; |
| 173 | act.sa_sigaction__sigaction_handler.sa_sigaction = rdbCheckHandleCrash; |
| 174 | sigaction(SIGSEGV11, &act, NULL((void*)0)); |
| 175 | sigaction(SIGBUS7, &act, NULL((void*)0)); |
| 176 | sigaction(SIGFPE8, &act, NULL((void*)0)); |
| 177 | sigaction(SIGILL4, &act, NULL((void*)0)); |
| 178 | sigaction(SIGABRT6, &act, NULL((void*)0)); |
| 179 | } |
| 180 | |
| 181 | /* Check the specified RDB file. Return 0 if the RDB looks sane, otherwise |
| 182 | * 1 is returned. |
| 183 | * The file is specified as a filename in 'rdbfilename' if 'fp' is not NULL, |
| 184 | * otherwise the already open file 'fp' is checked. */ |
| 185 | int redis_check_rdb(char *rdbfilename, FILE *fp) { |
| 186 | uint64_t dbid; |
| 187 | int type, rdbver; |
| 188 | char buf[1024]; |
| 189 | long long expiretime, now = mstime(); |
| 190 | static rio rdb; /* Pointed by global struct riostate. */ |
| 191 | |
| 192 | int closefile = (fp == NULL((void*)0)); |
| 193 | if (fp == NULL((void*)0) && (fp = fopen(rdbfilename,"r")) == NULL((void*)0)) return 1; |
| 194 | |
| 195 | rioInitWithFile(&rdb,fp); |
| 196 | rdbstate.rio = &rdb; |
| 197 | rdb.update_cksum = rdbLoadProgressCallback; |
| 198 | if (rioRead(&rdb,buf,9) == 0) goto eoferr; |
| 199 | buf[9] = '\0'; |
| 200 | if (memcmp(buf,"REDIS",5) != 0) { |
| 201 | rdbCheckError("Wrong signature trying to load DB from file"); |
| 202 | goto err; |
| 203 | } |
| 204 | rdbver = atoi(buf+5); |
| 205 | if (rdbver < 1 || rdbver > RDB_VERSION9) { |
| 206 | rdbCheckError("Can't handle RDB format version %d",rdbver); |
| 207 | goto err; |
| 208 | } |
| 209 | |
| 210 | expiretime = -1; |
| 211 | startLoadingFile(fp, rdbfilename, RDBFLAGS_NONE0); |
| 212 | while(1) { |
| 213 | robj *key, *val; |
| 214 | |
| 215 | /* Read type. */ |
| 216 | rdbstate.doing = RDB_CHECK_DOING_READ_TYPE1; |
| 217 | if ((type = rdbLoadType(&rdb)) == -1) goto eoferr; |
| 218 | |
| 219 | /* Handle special types. */ |
| 220 | if (type == RDB_OPCODE_EXPIRETIME253) { |
| 221 | rdbstate.doing = RDB_CHECK_DOING_READ_EXPIRE2; |
| 222 | /* EXPIRETIME: load an expire associated with the next key |
| 223 | * to load. Note that after loading an expire we need to |
| 224 | * load the actual type, and continue. */ |
| 225 | expiretime = rdbLoadTime(&rdb); |
| 226 | expiretime *= 1000; |
| 227 | if (rioGetReadError(&rdb)) goto eoferr; |
| 228 | continue; /* Read next opcode. */ |
| 229 | } else if (type == RDB_OPCODE_EXPIRETIME_MS252) { |
| 230 | /* EXPIRETIME_MS: milliseconds precision expire times introduced |
| 231 | * with RDB v3. Like EXPIRETIME but no with more precision. */ |
| 232 | rdbstate.doing = RDB_CHECK_DOING_READ_EXPIRE2; |
| 233 | expiretime = rdbLoadMillisecondTime(&rdb, rdbver); |
| 234 | if (rioGetReadError(&rdb)) goto eoferr; |
| 235 | continue; /* Read next opcode. */ |
| 236 | } else if (type == RDB_OPCODE_FREQ249) { |
| 237 | /* FREQ: LFU frequency. */ |
| 238 | uint8_t byte; |
| 239 | if (rioRead(&rdb,&byte,1) == 0) goto eoferr; |
| 240 | continue; /* Read next opcode. */ |
| 241 | } else if (type == RDB_OPCODE_IDLE248) { |
| 242 | /* IDLE: LRU idle time. */ |
| 243 | if (rdbLoadLen(&rdb,NULL((void*)0)) == RDB_LENERR(18446744073709551615UL)) goto eoferr; |
| 244 | continue; /* Read next opcode. */ |
| 245 | } else if (type == RDB_OPCODE_EOF255) { |
| 246 | /* EOF: End of file, exit the main loop. */ |
| 247 | break; |
| 248 | } else if (type == RDB_OPCODE_SELECTDB254) { |
| 249 | /* SELECTDB: Select the specified database. */ |
| 250 | rdbstate.doing = RDB_CHECK_DOING_READ_LEN6; |
| 251 | if ((dbid = rdbLoadLen(&rdb,NULL((void*)0))) == RDB_LENERR(18446744073709551615UL)) |
| 252 | goto eoferr; |
| 253 | rdbCheckInfo("Selecting DB ID %d", dbid); |
| 254 | continue; /* Read type again. */ |
| 255 | } else if (type == RDB_OPCODE_RESIZEDB251) { |
| 256 | /* RESIZEDB: Hint about the size of the keys in the currently |
| 257 | * selected data base, in order to avoid useless rehashing. */ |
| 258 | uint64_t db_size, expires_size; |
| 259 | rdbstate.doing = RDB_CHECK_DOING_READ_LEN6; |
| 260 | if ((db_size = rdbLoadLen(&rdb,NULL((void*)0))) == RDB_LENERR(18446744073709551615UL)) |
| 261 | goto eoferr; |
| 262 | if ((expires_size = rdbLoadLen(&rdb,NULL((void*)0))) == RDB_LENERR(18446744073709551615UL)) |
| 263 | goto eoferr; |
| 264 | continue; /* Read type again. */ |
| 265 | } else if (type == RDB_OPCODE_AUX250) { |
| 266 | /* AUX: generic string-string fields. Use to add state to RDB |
| 267 | * which is backward compatible. Implementations of RDB loading |
| 268 | * are requierd to skip AUX fields they don't understand. |
| 269 | * |
| 270 | * An AUX field is composed of two strings: key and value. */ |
| 271 | robj *auxkey, *auxval; |
| 272 | rdbstate.doing = RDB_CHECK_DOING_READ_AUX7; |
| 273 | if ((auxkey = rdbLoadStringObject(&rdb)) == NULL((void*)0)) goto eoferr; |
| 274 | if ((auxval = rdbLoadStringObject(&rdb)) == NULL((void*)0)) goto eoferr; |
| 275 | |
| 276 | rdbCheckInfo("AUX FIELD %s = '%s'", |
| 277 | (char*)auxkey->ptr, (char*)auxval->ptr); |
| 278 | decrRefCount(auxkey); |
| 279 | decrRefCount(auxval); |
| 280 | continue; /* Read type again. */ |
| 281 | } else if (type == RDB_OPCODE_MODULE_AUX247) { |
| 282 | /* AUX: Auxiliary data for modules. */ |
| 283 | uint64_t moduleid, when_opcode, when; |
| 284 | rdbstate.doing = RDB_CHECK_DOING_READ_MODULE_AUX8; |
| 285 | if ((moduleid = rdbLoadLen(&rdb,NULL((void*)0))) == RDB_LENERR(18446744073709551615UL)) goto eoferr; |
| 286 | if ((when_opcode = rdbLoadLen(&rdb,NULL((void*)0))) == RDB_LENERR(18446744073709551615UL)) goto eoferr; |
| 287 | if ((when = rdbLoadLen(&rdb,NULL((void*)0))) == RDB_LENERR(18446744073709551615UL)) goto eoferr; |
Although the value stored to 'when' is used in the enclosing expression, the value is never actually read from 'when' | |
| 288 | |
| 289 | char name[10]; |
| 290 | moduleTypeNameByID(name,moduleid); |
| 291 | rdbCheckInfo("MODULE AUX for: %s", name); |
| 292 | |
| 293 | robj *o = rdbLoadCheckModuleValue(&rdb,name); |
| 294 | decrRefCount(o); |
| 295 | continue; /* Read type again. */ |
| 296 | } else { |
| 297 | if (!rdbIsObjectType(type)((type >= 0 && type <= 7) || (type >= 9 && type <= 15))) { |
| 298 | rdbCheckError("Invalid object type: %d", type); |
| 299 | goto err; |
| 300 | } |
| 301 | rdbstate.key_type = type; |
| 302 | } |
| 303 | |
| 304 | /* Read key */ |
| 305 | rdbstate.doing = RDB_CHECK_DOING_READ_KEY3; |
| 306 | if ((key = rdbLoadStringObject(&rdb)) == NULL((void*)0)) goto eoferr; |
| 307 | rdbstate.key = key; |
| 308 | rdbstate.keys++; |
| 309 | /* Read value */ |
| 310 | rdbstate.doing = RDB_CHECK_DOING_READ_OBJECT_VALUE4; |
| 311 | if ((val = rdbLoadObject(type,&rdb,key->ptr)) == NULL((void*)0)) goto eoferr; |
| 312 | /* Check if the key already expired. */ |
| 313 | if (expiretime != -1 && expiretime < now) |
| 314 | rdbstate.already_expired++; |
| 315 | if (expiretime != -1) rdbstate.expires++; |
| 316 | rdbstate.key = NULL((void*)0); |
| 317 | decrRefCount(key); |
| 318 | decrRefCount(val); |
| 319 | rdbstate.key_type = -1; |
| 320 | expiretime = -1; |
| 321 | } |
| 322 | /* Verify the checksum if RDB version is >= 5 */ |
| 323 | if (rdbver >= 5 && server.rdb_checksum) { |
| 324 | uint64_t cksum, expected = rdb.cksum; |
| 325 | |
| 326 | rdbstate.doing = RDB_CHECK_DOING_CHECK_SUM5; |
| 327 | if (rioRead(&rdb,&cksum,8) == 0) goto eoferr; |
| 328 | memrev64ifbe(&cksum)((void)(0)); |
| 329 | if (cksum == 0) { |
| 330 | rdbCheckInfo("RDB file was saved with checksum disabled: no check performed."); |
| 331 | } else if (cksum != expected) { |
| 332 | rdbCheckError("RDB CRC error"); |
| 333 | goto err; |
| 334 | } else { |
| 335 | rdbCheckInfo("Checksum OK"); |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | if (closefile) fclose(fp); |
| 340 | stopLoading(1); |
| 341 | return 0; |
| 342 | |
| 343 | eoferr: /* unexpected end of file is handled here with a fatal exit */ |
| 344 | if (rdbstate.error_set) { |
| 345 | rdbCheckError(rdbstate.error); |
| 346 | } else { |
| 347 | rdbCheckError("Unexpected EOF reading RDB file"); |
| 348 | } |
| 349 | err: |
| 350 | if (closefile) fclose(fp); |
| 351 | stopLoading(0); |
| 352 | return 1; |
| 353 | } |
| 354 | |
| 355 | /* RDB check main: called form server.c when Redis is executed with the |
| 356 | * redis-check-rdb alias, on during RDB loading errors. |
| 357 | * |
| 358 | * The function works in two ways: can be called with argc/argv as a |
| 359 | * standalone executable, or called with a non NULL 'fp' argument if we |
| 360 | * already have an open file to check. This happens when the function |
| 361 | * is used to check an RDB preamble inside an AOF file. |
| 362 | * |
| 363 | * When called with fp = NULL, the function never returns, but exits with the |
| 364 | * status code according to success (RDB is sane) or error (RDB is corrupted). |
| 365 | * Otherwise if called with a non NULL fp, the function returns C_OK or |
| 366 | * C_ERR depending on the success or failure. */ |
| 367 | int redis_check_rdb_main(int argc, char **argv, FILE *fp) { |
| 368 | struct timeval tv; |
| 369 | |
| 370 | if (argc != 2 && fp == NULL((void*)0)) { |
| 371 | fprintf(stderrstderr, "Usage: %s <rdb-file-name>\n", argv[0]); |
| 372 | exit(1); |
| 373 | } |
| 374 | |
| 375 | gettimeofday(&tv, NULL((void*)0)); |
| 376 | init_genrand64(((long long) tv.tv_sec * 1000000 + tv.tv_usec) ^ getpid()); |
| 377 | |
| 378 | /* In order to call the loading functions we need to create the shared |
| 379 | * integer objects, however since this function may be called from |
| 380 | * an already initialized Redis instance, check if we really need to. */ |
| 381 | if (shared.integers[0] == NULL((void*)0)) |
| 382 | createSharedObjects(); |
| 383 | server.loading_process_events_interval_bytes = 0; |
| 384 | server.sanitize_dump_payload = SANITIZE_DUMP_YES1; |
| 385 | rdbCheckMode = 1; |
| 386 | rdbCheckInfo("Checking RDB file %s", argv[1]); |
| 387 | rdbCheckSetupSignals(); |
| 388 | int retval = redis_check_rdb(argv[1],fp); |
| 389 | if (retval == 0) { |
| 390 | rdbCheckInfo("\\o/ RDB looks OK! \\o/"); |
| 391 | rdbShowGenericInfo(); |
| 392 | } |
| 393 | if (fp) return (retval == 0) ? C_OK0 : C_ERR-1; |
| 394 | exit(retval); |
| 395 | } |