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} 123