source3/lib/ldb/examples/ldifreader.c

   1 /*
   2    example code for the ldb database library
   3
   4    Copyright (C) Brad Hards (bradh@frogmouth.net) 2005-2006
   5
   6      ** NOTE! The following LGPL license applies to the ldb
   7      ** library. This does NOT imply that all of Samba is released
   8      ** under the LGPL
   9
  10    This library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 3 of the License, or (at your option) any later version.
  14
  15    This library is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 /** \example ldifreader.c
  25
  26 The code below shows a simple LDB application.
  27
  28 It lists / dumps the entries in an LDIF file to standard output.
  29
  30 */
  31
  32 #include "includes.h"
  33 #include "ldb/include/ldb.h"
  34 #include "ldb/include/ldb_errors.h"
  35
  36 /*
  37   ldb_ldif_write takes a function pointer to a custom output
  38   function. This version is about as simple as the output function can
  39   be. In a more complex example, you'd likely be doing something with
  40   the private data function (e.g. holding a file handle).
  41 */
  42 static int vprintf_fn(void *private_data, const char *fmt, ...)
  43 {
  44         int retval;
  45         va_list ap;
  46
  47         va_start(ap, fmt);
  48         /* We just write to standard output */
  49         retval = vprintf(fmt, ap);
  50         va_end(ap);
  51         /* Note that the function should return the number of
  52            bytes written, or a negative error code */
  53         return retval;
  54 }
  55
  56 int main(int argc, const char **argv)
  57 {
  58         struct ldb_context *ldb;
  59         FILE *fileStream;
  60         struct ldb_ldif *ldifMsg;
  61
  62         if (argc != 2) {
  63                 printf("Usage %s filename.ldif\n", argv[0]);
  64                 exit(1);
  65         }
  66
  67         /*
  68           This is the always the first thing you want to do in an LDB
  69           application - initialise up the context structure.
  70
  71           Note that you can use the context structure as a parent
  72           for talloc allocations as well
  73         */
  74         ldb = ldb_init(NULL);
  75
  76         fileStream = fopen(argv[1], "r");
  77         if (0 == fileStream) {
  78                 perror(argv[1]);
  79                 exit(1);
  80         }
  81
  82         /*
  83           We now work through the filestream to get each entry.
  84         */
  85         while ( (ldifMsg = ldb_ldif_read_file(ldb, fileStream)) ) {
  86                 /*
  87                   Each message has a particular change type. For Add,
  88                   Modify and Delete, this will also appear in the
  89                   output listing (as changetype: add, changetype:
  90                   modify or changetype:delete, respectively).
  91                 */
  92                 switch (ldifMsg->changetype) {
  93                 case LDB_CHANGETYPE_NONE:
  94                         printf("ChangeType: None\n");
  95                         break;
  96                 case LDB_CHANGETYPE_ADD:
  97                         printf("ChangeType: Add\n");
  98                         break;
  99                 case LDB_CHANGETYPE_MODIFY:
 100                         printf("ChangeType: Modify\n");
 101                         break;
 102                 case LDB_CHANGETYPE_DELETE:
 103                         printf("ChangeType: Delete\n");
 104                         break;
 105                 default:
 106                         printf("ChangeType: Unknown\n");
 107                 }
 108
 109                 /*
 110                   We can now write out the results, using our custom
 111                   output routine as defined at the top of this file.
 112                 */
 113                 ldb_ldif_write(ldb, vprintf_fn, NULL, ldifMsg);
 114
 115                 /*
 116                   Clean up the message
 117                 */
 118                 ldb_ldif_read_free(ldb, ldifMsg);
 119         }
 120
 121         /*
 122           Clean up the context
 123         */
 124         talloc_free(ldb);
 125
 126         return 0;
 127 }