1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/*
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef STANDALONE
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <time.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <ctype.h>
#include <signal.h>
#else
#include "includes.h"
#endif
#include "tdb.h"
static int failed;
char *add_suffix(const char *name, const char *suffix)
{
char *ret;
int len = strlen(name) + strlen(suffix) + 1;
ret = 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_new->name);
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
*/
int backup_tdb(const char *old_name, const char *new_name)
{
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);
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);
return 1;
}
/* create the new tdb */
unlink(tmp_name);
tdb_new = tdb_open(tmp_name, tdb->header.hash_size,
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_new->fd);
/* 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
*/
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);
}
printf("%s : %d records\n", fname, count);
return 0;
}
|
