lib/tdb/tools/tdbrestore.c

   1 /*
   2    tdbrestore -- construct a tdb from tdbdump output.
   3    Copyright (C) Volker Lendecke                2010
   4    Copyright (C) Simon McVittie                 2005
   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 3 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, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include <assert.h>
  21 #include "replace.h"
  22 #include "system/locale.h"
  23 #include "system/time.h"
  24 #include "system/filesys.h"
  25 #include "system/wait.h"
  26 #include "tdb.h"
  27
  28 #define debug_fprintf(file, fmt, ...) do {/*nothing*/} while (0)
  29
  30 static int read_linehead(FILE *f)
  31 {
  32         int i, c;
  33         int num_bytes;
  34         char prefix[128];
  35
  36         while (1) {
  37                 c = getc(f);
  38                 if (c == EOF) {
  39                         return -1;
  40                 }
  41                 if (c == '(') {
  42                         break;
  43                 }
  44         }
  45         for (i=0; i<sizeof(prefix); i++) {
  46                 c = getc(f);
  47                 if (c == EOF) {
  48                         return -1;
  49                 }
  50                 prefix[i] = c;
  51                 if (c == '"') {
  52                         break;
  53                 }
  54         }
  55         if (i == sizeof(prefix)) {
  56                 return -1;
  57         }
  58         prefix[i] = '\0';
  59
  60         if (sscanf(prefix, "%d) = ", &num_bytes) != 1) {
  61                 return -1;
  62         }
  63         return num_bytes;
  64 }
  65
  66 static int read_hex(void) {
  67         int c;
  68         c = getchar();
  69         if (c == EOF) {
  70                 fprintf(stderr, "Unexpected EOF in data\n");
  71                 return -1;
  72         } else if (c == '"') {
  73                 fprintf(stderr, "Unexpected \\\" sequence\n");
  74                 return -1;
  75         } else if ('0' <= c && c <= '9')  {
  76                 return c - '0';
  77         } else if ('A' <= c && c <= 'F')  {
  78                 return c - 'A' + 10;
  79         } else if ('a' <= c && c <= 'f')  {
  80                 return c - 'a' + 10;
  81         } else {
  82                 fprintf(stderr, "Invalid hex: %c\n", c);
  83                 return -1;
  84         }
  85 }
  86
  87 static int read_data(FILE *f, TDB_DATA *d, size_t size) {
  88         int c, low, high;
  89         int i;
  90
  91         d->dptr = (unsigned char *)malloc(size);
  92         if (d->dptr == NULL) {
  93                 return -1;
  94         }
  95         d->dsize = size;
  96
  97         for (i=0; i<size; i++) {
  98                 c = getc(f);
  99                 if (c == EOF) {
 100                         fprintf(stderr, "Unexpected EOF in data\n");
 101                         return 1;
 102                 } else if (c == '"') {
 103                         return 0;
 104                 } else if (c == '\\') {
 105                         high = read_hex();
 106                         if (high < 0) {
 107                                 return -1;
 108                         }
 109                         high = high << 4;
 110                         assert(high == (high & 0xf0));
 111                         low = read_hex();
 112                         if (low < 0) {
 113                                 return -1;
 114                         }
 115                         assert(low == (low & 0x0f));
 116                         d->dptr[i] = (low|high);
 117                 } else {
 118                         d->dptr[i] = c;
 119                 }
 120         }
 121         return 0;
 122 }
 123
 124 static int swallow(FILE *f, const char *s, int *eof)
 125 {
 126         char line[128];
 127
 128         if (fgets(line, sizeof(line), f) == NULL) {
 129                 if (eof != NULL) {
 130                         *eof = 1;
 131                 }
 132                 return -1;
 133         }
 134         if (strcmp(line, s) != 0) {
 135                 return -1;
 136         }
 137         return 0;
 138 }
 139
 140 static int read_rec(FILE *f, TDB_CONTEXT *tdb, int *eof)
 141 {
 142         int length;
 143         TDB_DATA key, data;
 144         int ret = -1;
 145
 146         key.dptr = NULL;
 147         data.dptr = NULL;
 148
 149         if (swallow(f, "{\n", eof) == -1) {
 150                 goto fail;
 151         }
 152         length = read_linehead(f);
 153         if (length == -1) {
 154                 goto fail;
 155         }
 156         if (read_data(f, &key, length) == -1) {
 157                 goto fail;
 158         }
 159         if (swallow(f, "\"\n", NULL) == -1) {
 160                 goto fail;
 161         }
 162         length = read_linehead(f);
 163         if (length == -1) {
 164                 goto fail;
 165         }
 166         if (read_data(f, &data, length) == -1) {
 167                 goto fail;
 168         }
 169         if ((swallow(f, "\"\n", NULL) == -1)
 170             || (swallow(f, "}\n", NULL) == -1)) {
 171                 goto fail;
 172         }
 173         if (tdb_store(tdb, key, data, TDB_INSERT) != 0) {
 174                 fprintf(stderr, "TDB error: %s\n", tdb_errorstr(tdb));
 175                 goto fail;
 176         }
 177
 178         ret = 0;
 179 fail:
 180         free(key.dptr);
 181         free(data.dptr);
 182         return ret;
 183 }
 184
 185 static int restore_tdb(const char *fname)
 186 {
 187         TDB_CONTEXT *tdb;
 188
 189         tdb = tdb_open(fname, 0, 0, O_RDWR|O_CREAT|O_EXCL, 0666);
 190         if (!tdb) {
 191                 perror("tdb_open");
 192                 fprintf(stderr, "Failed to open %s\n", fname);
 193                 return 1;
 194         }
 195
 196         while (1) {
 197                 int eof = 0;
 198                 if (read_rec(stdin, tdb, &eof) == -1) {
 199                         if (eof) {
 200                                 break;
 201                         }
 202                         return 1;
 203                 }
 204         }
 205         if (tdb_close(tdb)) {
 206                 fprintf(stderr, "Error closing tdb\n");
 207                 return 1;
 208         }
 209         return 0;
 210 }
 211
 212 int main(int argc, char *argv[])
 213 {
 214         char *fname;
 215
 216         if (argc < 2) {
 217                 printf("Usage: %s dbname < tdbdump_output\n", argv[0]);
 218                 exit(1);
 219         }
 220
 221         fname = argv[1];
 222
 223         return restore_tdb(fname);
 224 }