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author | Jelmer Vernooij <jelmer@samba.org> | 2008-09-16 15:16:31 +0200 |
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committer | Jelmer Vernooij <jelmer@samba.org> | 2008-09-16 15:16:31 +0200 |
commit | 7111645d3c46e55b2c180e3db0ba8a3c670a3c31 (patch) | |
tree | 2c68d65b55dc5829939fbd960742da6cd35de9db /source3/lib/tdb/tools/tdbbackup.c | |
parent | ec1c854f2175823bd1ad39c2e272d1b3fab80bf1 (diff) | |
download | samba-7111645d3c46e55b2c180e3db0ba8a3c670a3c31.tar.gz samba-7111645d3c46e55b2c180e3db0ba8a3c670a3c31.tar.bz2 samba-7111645d3c46e55b2c180e3db0ba8a3c670a3c31.zip |
Use single copy of tdb in both samba3 and samba4.
Diffstat (limited to 'source3/lib/tdb/tools/tdbbackup.c')
-rw-r--r-- | source3/lib/tdb/tools/tdbbackup.c | 300 |
1 files changed, 0 insertions, 300 deletions
diff --git a/source3/lib/tdb/tools/tdbbackup.c b/source3/lib/tdb/tools/tdbbackup.c deleted file mode 100644 index 6f3ca48314..0000000000 --- a/source3/lib/tdb/tools/tdbbackup.c +++ /dev/null @@ -1,300 +0,0 @@ -/* - Unix SMB/CIFS implementation. - low level tdb backup and restore utility - Copyright (C) Andrew Tridgell 2002 - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 3 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program. If not, see <http://www.gnu.org/licenses/>. -*/ - -/* - - This program is meant for backup/restore of tdb databases. Typical usage would be: - tdbbackup *.tdb - when Samba shuts down cleanly, which will make a backup of all the local databases - to *.bak files. Then on Samba startup you would use: - tdbbackup -v *.tdb - and this will check the databases for corruption and if corruption is detected then - the backup will be restored. - - You may also like to do a backup on a regular basis while Samba is - running, perhaps using cron. - - The reason this program is needed is to cope with power failures - while Samba is running. A power failure could lead to database - corruption and Samba will then not start correctly. - - Note that many of the databases in Samba are transient and thus - don't need to be backed up, so you can optimise the above a little - by only running the backup on the critical databases. - - */ - -#include "replace.h" -#include "system/locale.h" -#include "system/time.h" -#include "system/filesys.h" -#include "system/wait.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_new)); - 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, NULL); - 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); - 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 -*/ -static int file_newer(const char *fname1, const char *fname2) -{ - struct stat st1, st2; - if (stat(fname1, &st1) != 0) { - return 0; - } - if (stat(fname2, &st2) != 0) { - return 1; - } - return (st1.st_mtime > st2.st_mtime); -} - -static void usage(void) -{ - printf("Usage: tdbbackup [options] <fname...>\n\n"); - 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"); -} - - - int main(int argc, char *argv[]) -{ - int i; - int ret = 0; - int c; - int verify = 0; - int hashsize = 0; - const char *suffix = ".bak"; - - while ((c = getopt(argc, argv, "vhs:n:")) != -1) { - switch (c) { - case 'h': - usage(); - exit(0); - case 'v': - verify = 1; - break; - case 's': - suffix = optarg; - break; - case 'n': - hashsize = atoi(optarg); - break; - } - } - - argc -= optind; - argv += optind; - - if (argc < 1) { - usage(); - exit(1); - } - - for (i=0; i<argc; i++) { - const char *fname = argv[i]; - char *bak_name; - - bak_name = add_suffix(fname, suffix); - - if (verify) { - if (verify_tdb(fname, bak_name) != 0) { - ret = 1; - } - } else { - if (file_newer(fname, bak_name) && - backup_tdb(fname, bak_name, hashsize) != 0) { - ret = 1; - } - } - - free(bak_name); - } - - return ret; -} |