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 ldbreader.c
25 
26 The code below shows a simple LDB application.
27 
28 It lists / dumps the records in a LDB database to standard output.
29 
30 */
31 
32 #include "ldb.h"
33 
34 /*
35   ldb_ldif_write takes a function pointer to a custom output
36   function. This version is about as simple as the output function can
37   be. In a more complex example, you'd likely be doing something with
38   the private data function (e.g. holding a file handle).
39 */
40 static int vprintf_fn(void *private_data, const char *fmt, ...)
41 {
42 	int retval;
43 	va_list ap;
44 
45 	va_start(ap, fmt);
46 	/* We just write to standard output */
47 	retval = vprintf(fmt, ap);
48 	va_end(ap);
49 	/* Note that the function should return the number of
50 	   bytes written, or a negative error code */
51 	return retval;
52 }
53 
54 int main(int argc, const char **argv)
55 {
56 	struct ldb_context *ldb;
57 	const char *expression = "(dn=*)";
58 	struct ldb_result *resultMsg;
59 	int i;
60 
61 	/*
62 	  This is the always the first thing you want to do in an LDB
63 	  application - initialise up the context structure.
64 
65 	  Note that you can use the context structure as a parent
66 	  for talloc allocations as well
67 	*/
68 	ldb = ldb_init(NULL, NULL);
69 
70 	/*
71 	  We now open the database. In this example we just hard code the connection path.
72 
73 	  Also note that the database is being opened read-only. This means that the
74 	  call will fail unless the database already exists.
75 	*/
76 	if (LDB_SUCCESS != ldb_connect(ldb, "tdb://tdbtest.ldb", LDB_FLG_RDONLY, NULL) ){
77 		printf("Problem on connection\n");
78 		exit(-1);
79 	}
80 
81 	/*
82 	  At this stage we have an open database, and can start using it. It is opened
83 	  read-only, so a query is possible.
84 
85 	  We construct a search that just returns all the (sensible) contents. You can do
86 	  quite fine grained results with the LDAP search syntax, however it is a bit
87 	  confusing to start with. See RFC2254.
88 	*/
89 	if (LDB_SUCCESS != ldb_search(ldb, ldb, &resultMsg,
90 				      NULL, LDB_SCOPE_DEFAULT, NULL,
91 				      "%s", expression)) {
92 		printf("Problem in search\n");
93 		exit(-1);
94 	}
95 
96 	printf("%i records returned\n", resultMsg->count);
97 
98 	/*
99 	  We can now iterate through the results, writing them out
100 	  (to standard output) with our custom output routine as defined
101 	  at the top of this file
102 	*/
103 	for (i = 0; i < resultMsg->count; ++i) {
104 		struct ldb_ldif ldifMsg;
105 
106 		printf("Message: %i\n", i+1);
107 
108 		ldifMsg.changetype = LDB_CHANGETYPE_NONE;
109 		ldifMsg.msg = resultMsg->msgs[i];
110 		ldb_ldif_write(ldb, vprintf_fn, NULL, &ldifMsg);
111 	}
112 
113 	/*
114 	  There are two objects to clean up - the result from the
115 	  ldb_search() query, and the original ldb context.
116 	*/
117 	talloc_free(resultMsg);
118 
119 	talloc_free(ldb);
120 
121 	return 0;
122 }
123