1/* 2 Unix SMB/CIFS implementation. 3 low level tdb backup and restore utility 4 Copyright (C) Andrew Tridgell 2002 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19*/ 20 21#ifdef STANDALONE 22#if HAVE_CONFIG_H 23#include <config.h> 24#endif 25 26#include <errno.h> 27#include <stdlib.h> 28#include <stdio.h> 29#include <fcntl.h> 30#include <unistd.h> 31#include <string.h> 32#include <fcntl.h> 33#include <time.h> 34#include <sys/mman.h> 35 36#include <sys/stat.h> 37#include <sys/time.h> 38#include <ctype.h> 39#include <signal.h> 40 41#else 42#include "includes.h" 43 44#ifdef malloc 45#undef malloc 46#endif 47 48#ifdef realloc 49#undef realloc 50#endif 51 52#ifdef calloc 53#undef calloc 54#endif 55 56#endif 57 58#include "tdb.h" 59 60static int failed; 61 62char *add_suffix(const char *name, const char *suffix) 63{ 64 char *ret; 65 int len = strlen(name) + strlen(suffix) + 1; 66 ret = malloc(len); 67 if (!ret) { 68 fprintf(stderr,"Out of memory!\n"); 69 exit(1); 70 } 71 snprintf(ret, len, "%s%s", name, suffix); 72 return ret; 73} 74 75static int copy_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state) 76{ 77 TDB_CONTEXT *tdb_new = (TDB_CONTEXT *)state; 78 79 if (tdb_store(tdb_new, key, dbuf, TDB_INSERT) != 0) { 80 fprintf(stderr,"Failed to insert into %s\n", tdb_new->name); 81 failed = 1; 82 return 1; 83 } 84 return 0; 85} 86 87 88static int test_fn(TDB_CONTEXT *tdb, TDB_DATA key, TDB_DATA dbuf, void *state) 89{ 90 return 0; 91} 92 93/* 94 carefully backup a tdb, validating the contents and 95 only doing the backup if its OK 96 this function is also used for restore 97*/ 98int backup_tdb(const char *old_name, const char *new_name) 99{ 100 TDB_CONTEXT *tdb; 101 TDB_CONTEXT *tdb_new; 102 char *tmp_name; 103 struct stat st; 104 int count1, count2; 105 106 tmp_name = add_suffix(new_name, ".tmp"); 107 108 /* stat the old tdb to find its permissions */ 109 if (stat(old_name, &st) != 0) { 110 perror(old_name); 111 return 1; 112 } 113 114 /* open the old tdb */ 115 tdb = tdb_open(old_name, 0, 0, O_RDWR, 0); 116 if (!tdb) { 117 printf("Failed to open %s\n", old_name); 118 return 1; 119 } 120 121 /* create the new tdb */ 122 unlink(tmp_name); 123 tdb_new = tdb_open(tmp_name, tdb->header.hash_size, 124 TDB_DEFAULT, O_RDWR|O_CREAT|O_EXCL, 125 st.st_mode & 0777); 126 if (!tdb_new) { 127 perror(tmp_name); 128 free(tmp_name); 129 return 1; 130 } 131 132 /* lock the old tdb */ 133 if (tdb_lockall(tdb) != 0) { 134 fprintf(stderr,"Failed to lock %s\n", old_name); 135 tdb_close(tdb); 136 tdb_close(tdb_new); 137 unlink(tmp_name); 138 free(tmp_name); 139 return 1; 140 } 141 142 failed = 0; 143 144 /* traverse and copy */ 145 count1 = tdb_traverse(tdb, copy_fn, (void *)tdb_new); 146 if (count1 < 0 || failed) { 147 fprintf(stderr,"failed to copy %s\n", old_name); 148 tdb_close(tdb); 149 tdb_close(tdb_new); 150 unlink(tmp_name); 151 free(tmp_name); 152 return 1; 153 } 154 155 /* close the old tdb */ 156 tdb_close(tdb); 157 158 /* close the new tdb and re-open read-only */ 159 tdb_close(tdb_new); 160 tdb_new = tdb_open(tmp_name, 0, TDB_DEFAULT, O_RDONLY, 0); 161 if (!tdb_new) { 162 fprintf(stderr,"failed to reopen %s\n", tmp_name); 163 unlink(tmp_name); 164 perror(tmp_name); 165 free(tmp_name); 166 return 1; 167 } 168 169 /* traverse the new tdb to confirm */ 170 count2 = tdb_traverse(tdb_new, test_fn, 0); 171 if (count2 != count1) { 172 fprintf(stderr,"failed to copy %s\n", old_name); 173 tdb_close(tdb_new); 174 unlink(tmp_name); 175 free(tmp_name); 176 return 1; 177 } 178 179 /* make sure the new tdb has reached stable storage */ 180 fsync(tdb_new->fd); 181 182 /* close the new tdb and rename it to .bak */ 183 tdb_close(tdb_new); 184 unlink(new_name); 185 if (rename(tmp_name, new_name) != 0) { 186 perror(new_name); 187 free(tmp_name); 188 return 1; 189 } 190 191 free(tmp_name); 192 193 return 0; 194} 195 196 197 198/* 199 verify a tdb and if it is corrupt then restore from *.bak 200*/ 201int verify_tdb(const char *fname, const char *bak_name) 202{ 203 TDB_CONTEXT *tdb; 204 int count = -1; 205 206 /* open the tdb */ 207 tdb = tdb_open(fname, 0, 0, O_RDONLY, 0); 208 209 /* traverse the tdb, then close it */ 210 if (tdb) { 211 count = tdb_traverse(tdb, test_fn, NULL); 212 tdb_close(tdb); 213 } 214 215 /* count is < 0 means an error */ 216 if (count < 0) { 217 printf("restoring %s\n", fname); 218 return backup_tdb(bak_name, fname); 219 } 220 221 printf("%s : %d records\n", fname, count); 222 223 return 0; 224} 225