source: branches/samba-3.3.x/source/lib/ldb/examples/ldbreader.c

Last change on this file was 206, checked in by Herwig Bauernfeind, 16 years ago

Import Samba 3.3 branch at 3.0.0 level (psmedley's port)
File size: 3.5 KB
Line 
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
26The code below shows a simple LDB application.
27
28It lists / dumps the records in a LDB database 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*/
42static 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
56int main(int argc, const char **argv)
57{
58 struct ldb_context *ldb;
59 const char *expression = "(dn=*)";
60 struct ldb_result *resultMsg;
61 int i;
62
63 /*
64 This is the always the first thing you want to do in an LDB
65 application - initialise up the context structure.
66
67 Note that you can use the context structure as a parent
68 for talloc allocations as well
69 */
70 ldb = ldb_init(NULL);
71
72 /*
73 We now open the database. In this example we just hard code the connection path.
74
75 Also note that the database is being opened read-only. This means that the
76 call will fail unless the database already exists.
77 */
78 if (LDB_SUCCESS != ldb_connect(ldb, "tdb://tdbtest.ldb", LDB_FLG_RDONLY, NULL) ){
79 printf("Problem on connection\n");
80 exit(-1);
81 }
82
83 /*
84 At this stage we have an open database, and can start using it. It is opened
85 read-only, so a query is possible.
86
87 We construct a search that just returns all the (sensible) contents. You can do
88 quite fine grained results with the LDAP search syntax, however it is a bit
89 confusing to start with. See RFC2254.
90 */
91 if (LDB_SUCCESS != ldb_search(ldb, NULL, LDB_SCOPE_DEFAULT,
92 expression, NULL, &resultMsg) ) {
93 printf("Problem in search\n");
94 exit(-1);
95 }
96
97 printf("%i records returned\n", resultMsg->count);
98
99 /*
100 We can now iterate through the results, writing them out
101 (to standard output) with our custom output routine as defined
102 at the top of this file
103 */
104 for (i = 0; i < resultMsg->count; ++i) {
105 struct ldb_ldif ldifMsg;
106
107 printf("Message: %i\n", i+1);
108
109 ldifMsg.changetype = LDB_CHANGETYPE_NONE;
110 ldifMsg.msg = resultMsg->msgs[i];
111 ldb_ldif_write(ldb, vprintf_fn, NULL, &ldifMsg);
112 }
113
114 /*
115 There are two objects to clean up - the result from the
116 ldb_search() query, and the original ldb context.
117 */
118 talloc_free(resultMsg);
119
120 talloc_free(ldb);
121
122 return 0;
123}
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