diff options
Diffstat (limited to 'source4/lib/tdb/tools/tdbbackup.c')
| -rw-r--r-- | source4/lib/tdb/tools/tdbbackup.c | 186 |
1 files changed, 181 insertions, 5 deletions
diff --git a/source4/lib/tdb/tools/tdbbackup.c b/source4/lib/tdb/tools/tdbbackup.c index 45beb5e292..2e728d46aa 100644 --- a/source4/lib/tdb/tools/tdbbackup.c +++ b/source4/lib/tdb/tools/tdbbackup.c @@ -42,8 +42,181 @@ */ #include "replace.h" -#include "tdb.h" +#include "system/locale.h" +#include "system/time.h" #include "system/filesys.h" +#include "tdb.h" + +#ifdef HAVE_GETOPT_H +#include <getopt.h> +#endif + +static int failed; + +static char *add_suffix(const char *name, const char *suffix) +{ + char *ret; + int len = strlen(name) + strlen(suffix) + 1; + ret = (char *)malloc(len); + if (!ret) { + fprintf(stderr,"Out of memory!\n"); + exit(1); + } + snprintf(ret, len, "%s%s", name, suffix); + return ret; +} + +static int copy_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state) +{ + TDB_CONTEXT *tdb_new = (TDB_CONTEXT *)state; + + if (tdb_store(tdb_new, key, dbuf, TDB_INSERT) != 0) { + fprintf(stderr,"Failed to insert into %s\n", tdb_name(tdb)); + failed = 1; + return 1; + } + return 0; +} + + +static int test_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state) +{ + return 0; +} + +/* + carefully backup a tdb, validating the contents and + only doing the backup if its OK + this function is also used for restore +*/ +static int backup_tdb(const char *old_name, const char *new_name, int hash_size) +{ + TDB_CONTEXT *tdb; + TDB_CONTEXT *tdb_new; + char *tmp_name; + struct stat st; + int count1, count2; + + tmp_name = add_suffix(new_name, ".tmp"); + + /* stat the old tdb to find its permissions */ + if (stat(old_name, &st) != 0) { + perror(old_name); + free(tmp_name); + return 1; + } + + /* open the old tdb */ + tdb = tdb_open(old_name, 0, 0, O_RDWR, 0); + if (!tdb) { + printf("Failed to open %s\n", old_name); + free(tmp_name); + return 1; + } + + /* create the new tdb */ + unlink(tmp_name); + tdb_new = tdb_open(tmp_name, + hash_size ? hash_size : tdb_hash_size(tdb), + TDB_DEFAULT, O_RDWR|O_CREAT|O_EXCL, + st.st_mode & 0777); + if (!tdb_new) { + perror(tmp_name); + free(tmp_name); + return 1; + } + + /* lock the old tdb */ + if (tdb_lockall(tdb) != 0) { + fprintf(stderr,"Failed to lock %s\n", old_name); + tdb_close(tdb); + tdb_close(tdb_new); + unlink(tmp_name); + free(tmp_name); + return 1; + } + + failed = 0; + + /* traverse and copy */ + count1 = tdb_traverse(tdb, copy_fn, (void *)tdb_new); + if (count1 < 0 || failed) { + fprintf(stderr,"failed to copy %s\n", old_name); + tdb_close(tdb); + tdb_close(tdb_new); + unlink(tmp_name); + free(tmp_name); + return 1; + } + + /* close the old tdb */ + tdb_close(tdb); + + /* close the new tdb and re-open read-only */ + tdb_close(tdb_new); + tdb_new = tdb_open(tmp_name, 0, TDB_DEFAULT, O_RDONLY, 0); + if (!tdb_new) { + fprintf(stderr,"failed to reopen %s\n", tmp_name); + unlink(tmp_name); + perror(tmp_name); + free(tmp_name); + return 1; + } + + /* traverse the new tdb to confirm */ + count2 = tdb_traverse(tdb_new, test_fn, 0); + if (count2 != count1) { + fprintf(stderr,"failed to copy %s\n", old_name); + tdb_close(tdb_new); + unlink(tmp_name); + free(tmp_name); + return 1; + } + + /* make sure the new tdb has reached stable storage */ + fsync(tdb_fd(tdb_new)); + + /* close the new tdb and rename it to .bak */ + tdb_close(tdb_new); + unlink(new_name); + if (rename(tmp_name, new_name) != 0) { + perror(new_name); + free(tmp_name); + return 1; + } + + free(tmp_name); + + return 0; +} + +/* + verify a tdb and if it is corrupt then restore from *.bak +*/ +static int verify_tdb(const char *fname, const char *bak_name) +{ + TDB_CONTEXT *tdb; + int count = -1; + + /* open the tdb */ + tdb = tdb_open(fname, 0, 0, O_RDONLY, 0); + + /* traverse the tdb, then close it */ + if (tdb) { + count = tdb_traverse(tdb, test_fn, NULL); + tdb_close(tdb); + } + + /* count is < 0 means an error */ + if (count < 0) { + printf("restoring %s\n", fname); + return backup_tdb(bak_name, fname, 0); + } + + printf("%s : %d records\n", fname, count); + + return 0; +} /* see if one file is newer than another @@ -66,6 +239,7 @@ static void usage(void) printf(" -h this help message\n"); printf(" -s suffix set the backup suffix\n"); printf(" -v verify mode (restore if corrupt)\n"); + printf(" -n hashsize set the new hash size for the backup\n"); } @@ -75,11 +249,10 @@ static void usage(void) int ret = 0; int c; int verify = 0; + int hashsize = 0; const char *suffix = ".bak"; - extern int optind; - extern char *optarg; - while ((c = getopt(argc, argv, "vhs:")) != -1) { + while ((c = getopt(argc, argv, "vhs:n:")) != -1) { switch (c) { case 'h': usage(); @@ -90,6 +263,9 @@ static void usage(void) case 's': suffix = optarg; break; + case 'n': + hashsize = atoi(optarg); + break; } } @@ -113,7 +289,7 @@ static void usage(void) } } else { if (file_newer(fname, bak_name) && - backup_tdb(fname, bak_name) != 0) { + backup_tdb(fname, bak_name, hashsize) != 0) { ret = 1; } } |