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RDB files now embed a crc64 checksum. Version of RDB bumped to 5.

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This commit is contained in:
antirez 2012-04-09 22:40:41 +02:00
parent 8491f1d9fd
commit 82e32055d8
2 changed files with 25 additions and 2 deletions
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25
src/rdb.c
View File

@ -1,6 +1,7 @@
#include "redis.h"
#include "lzf.h" /* LZF compression library */
#include "zipmap.h"
#include "endianconv.h"
#include <math.h>
#include <sys/types.h>
@ -602,6 +603,7 @@ int rdbSave(char *filename) {
long long now = mstime();
FILE *fp;
rio rdb;
uint64_t cksum;
snprintf(tmpfile,256,"temp-%d.rdb", (int) getpid());
fp = fopen(tmpfile,"w");
@ -612,6 +614,7 @@ int rdbSave(char *filename) {
}
rioInitWithFile(&rdb,fp);
rdb.update_cksum = rioGenericUpdateChecksum;
snprintf(magic,sizeof(magic),"REDIS%04d",REDIS_RDB_VERSION);
if (rdbWriteRaw(&rdb,magic,9) == -1) goto werr;
@ -641,9 +644,16 @@ int rdbSave(char *filename) {
}
dictReleaseIterator(di);
}
di = NULL; /* So that we don't release it again on error. */
/* EOF opcode */
if (rdbSaveType(&rdb,REDIS_RDB_OPCODE_EOF) == -1) goto werr;
/* CRC64 checksum */
cksum = rdb.cksum;
memrev64ifbe(&cksum);
rioWrite(&rdb,&cksum,8);
/* Make sure data will not remain on the OS's output buffers */
fflush(fp);
fsync(fileno(fp));
@ -1016,6 +1026,7 @@ int rdbLoad(char *filename) {
return REDIS_ERR;
}
rioInitWithFile(&rdb,fp);
rdb.update_cksum = rioGenericUpdateChecksum;
if (rioRead(&rdb,buf,9) == 0) goto eoferr;
buf[9] = '\0';
if (memcmp(buf,"REDIS",5) != 0) {
@ -1025,7 +1036,7 @@ int rdbLoad(char *filename) {
return REDIS_ERR;
}
rdbver = atoi(buf+5);
if (rdbver < 1 || rdbver > 4) {
if (rdbver < 1 || rdbver > 5) {
fclose(fp);
redisLog(REDIS_WARNING,"Can't handle RDB format version %d",rdbver);
errno = EINVAL;
@ -1096,6 +1107,18 @@ int rdbLoad(char *filename) {
decrRefCount(key);
}
/* Verify the checksum if RDB version is >= 5 */
if (rdbver >= 5) {
uint64_t cksum, expected = rdb.cksum;
if (rioRead(&rdb,&cksum,8) == 0) goto eoferr;
memrev64ifbe(&cksum);
if (cksum != expected) {
redisLog(REDIS_WARNING,"Wrong RDB checksum. Aborting now.");
exit(1);
}
}
fclose(fp);
stopLoading();
return REDIS_OK;

2
src/rdb.h
View File

@ -9,7 +9,7 @@
/* The current RDB version. When the format changes in a way that is no longer
* backward compatible this number gets incremented. */
#define REDIS_RDB_VERSION 4
#define REDIS_RDB_VERSION 5
/* Defines related to the dump file format. To store 32 bits lengths for short
* keys requires a lot of space, so we check the most significant 2 bits of