summaryrefslogtreecommitdiff
path: root/source4/lib/ldb/examples/ldbreader.c
blob: 6e5811453115b339cd0fdcd79690619ff7e0fa6f (plain)
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
/* 
   example code for the ldb database library

   Copyright (C) Brad Hards (bradh@frogmouth.net) 2005-2006

     ** NOTE! The following LGPL license applies to the ldb
     ** library. This does NOT imply that all of Samba is released
     ** under the LGPL
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/

/** \example ldbreader.c

The code below shows a simple LDB application.

It lists / dumps the records in a LDB database to standard output.

*/

#include "ldb_includes.h"
#include "ldb.h"
#include "ldb_errors.h"

/*
  ldb_ldif_write takes a function pointer to a custom output
  function. This version is about as simple as the output function can
  be. In a more complex example, you'd likely be doing something with
  the private data function (e.g. holding a file handle).
*/
static int vprintf_fn(void *private_data, const char *fmt, ...)
{
	int retval;
	va_list ap;

	va_start(ap, fmt);
	/* We just write to standard output */
	retval = vprintf(fmt, ap);
	va_end(ap);
	/* Note that the function should return the number of 
	   bytes written, or a negative error code */
	return retval;
}
  
int main(int argc, const char **argv)
{
	struct ldb_context *ldb;
	const char *expression = "(dn=*)";
	struct ldb_result *resultMsg;
	int i;

	/*
	  This is the always the first thing you want to do in an LDB
	  application - initialise up the context structure.

	  Note that you can use the context structure as a parent
	  for talloc allocations as well
	*/
	ldb = ldb_init(NULL, NULL);

	/*
	  We now open the database. In this example we just hard code the connection path.

	  Also note that the database is being opened read-only. This means that the 
	  call will fail unless the database already exists. 
	*/
	if (LDB_SUCCESS != ldb_connect(ldb, "tdb://tdbtest.ldb", LDB_FLG_RDONLY, NULL) ){
		printf("Problem on connection\n");
		exit(-1);
	}

	/*
	  At this stage we have an open database, and can start using it. It is opened
	  read-only, so a query is possible. 

	  We construct a search that just returns all the (sensible) contents. You can do
	  quite fine grained results with the LDAP search syntax, however it is a bit
	  confusing to start with. See RFC2254.
	*/
	if (LDB_SUCCESS != ldb_search(ldb, NULL, LDB_SCOPE_DEFAULT,
				      expression, NULL, &resultMsg) ) {
		printf("Problem in search\n");
		exit(-1);
	}
	
	printf("%i records returned\n", resultMsg->count);

	/*
	  We can now iterate through the results, writing them out
	  (to standard output) with our custom output routine as defined
	  at the top of this file
	*/
	for (i = 0; i < resultMsg->count; ++i) {
		struct ldb_ldif ldifMsg;

		printf("Message: %i\n", i+1);
		
		ldifMsg.changetype = LDB_CHANGETYPE_NONE;
		ldifMsg.msg = resultMsg->msgs[i];
		ldb_ldif_write(ldb, vprintf_fn, NULL, &ldifMsg);
	}

	/*
	  There are two objects to clean up - the result from the 
	  ldb_search() query, and the original ldb context.
	*/
	talloc_free(resultMsg);

	talloc_free(ldb);

	return 0;
}