1/*
2   Unix SMB/CIFS implementation.
3   ldap filter argument escaping
4
5   Copyright (C) 1998, 1999, 2000 Luke Howard <lukeh@padl.com>,
6   Copyright (C) 2003 Andrew Bartlett <abartlet@samba.org>
7
8
9   This program is free software; you can redistribute it and/or modify
10   it under the terms of the GNU General Public License as published by
11   the Free Software Foundation; either version 2 of the License, or
12   (at your option) any later version.
13
14   This program is distributed in the hope that it will be useful,
15   but WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17   GNU General Public License for more details.
18
19   You should have received a copy of the GNU General Public License
20   along with this program; if not, write to the Free Software
21   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22*/
23
24#include "includes.h"
25
26/**
27 * Escape a parameter to an LDAP filter string, so they cannot contain
28 * embeded ( ) * or \ chars which may cause it not to parse correctly.
29 *
30 * @param s The input string
31 *
32 * @return A string allocated with malloc(), containing the escaped string,
33 * and to be free()ed by the caller.
34 **/
35
36char *escape_ldap_string_alloc(const char *s)
37{
38	size_t len = strlen(s)+1;
39	char *output = SMB_MALLOC(len);
40	char *output_tmp;
41	const char *sub;
42	int i = 0;
43	char *p = output;
44
45	while (*s)
46	{
47		switch (*s)
48		{
49		case '*':
50			sub = "\\2a";
51			break;
52		case '(':
53			sub = "\\28";
54			break;
55		case ')':
56			sub = "\\29";
57			break;
58		case '\\':
59			sub = "\\5c";
60			break;
61		default:
62			sub = NULL;
63			break;
64		}
65
66		if (sub) {
67			len = len + 3;
68			output_tmp = SMB_REALLOC(output, len);
69			if (!output_tmp) {
70				SAFE_FREE(output);
71				return NULL;
72			}
73			output = output_tmp;
74
75			p = &output[i];
76			strncpy (p, sub, 3);
77			p += 3;
78			i += 3;
79
80		} else {
81			*p = *s;
82			p++;
83			i++;
84		}
85		s++;
86	}
87
88	*p = '\0';
89	return output;
90}
91