source: branches/samba-3.5.x/source4/lib/ldb/examples/ldbreader.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
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 "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*/
40static 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
54int 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}
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