1/*
2   Unix SMB/CIFS implementation.
3   server specific string routines
4   Copyright (C) Andrew Tridgell 2001
5   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003
6
7   This program is free software; you can redistribute it and/or modify
8   it under the terms of the GNU General Public License as published by
9   the Free Software Foundation; either version 3 of the License, or
10   (at your option) any later version.
11
12   This program is distributed in the hope that it will be useful,
13   but WITHOUT ANY WARRANTY; without even the implied warranty of
14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   GNU General Public License for more details.
16
17   You should have received a copy of the GNU General Public License
18   along with this program.  If not, see <http://www.gnu.org/licenses/>.
19*/
20
21#include "includes.h"
22#include "smbd/globals.h"
23
24/* Make sure we can't write a string past the end of the buffer */
25
26size_t srvstr_push_fn(const char *function, unsigned int line,
27		      const char *base_ptr, uint16 smb_flags2, void *dest,
28		      const char *src, int dest_len, int flags)
29{
30	if (dest_len < 0) {
31		return 0;
32	}
33
34	/* 'normal' push into size-specified buffer */
35	return push_string_base(function, line, base_ptr, smb_flags2, dest, src,
36				dest_len, flags);
37}
38
39/*******************************************************************
40 Add a string to the end of a smb_buf, adjusting bcc and smb_len.
41 Return the bytes added
42********************************************************************/
43
44ssize_t message_push_string(uint8 **outbuf, const char *str, int flags)
45{
46	size_t buf_size = smb_len(*outbuf) + 4;
47	size_t grow_size;
48	size_t result;
49	uint8 *tmp;
50
51	/*
52	 * We need to over-allocate, now knowing what srvstr_push will
53	 * actually use. This is very generous by incorporating potential
54	 * padding, the terminating 0 and at most 4 chars per UTF-16 code
55	 * point.
56	 */
57	grow_size = (strlen(str) + 2) * 4;
58
59	if (!(tmp = TALLOC_REALLOC_ARRAY(NULL, *outbuf, uint8,
60					 buf_size + grow_size))) {
61		DEBUG(0, ("talloc failed\n"));
62		return -1;
63	}
64
65	result = srvstr_push((char *)tmp, SVAL(tmp, smb_flg2),
66			     tmp + buf_size, str, grow_size, flags);
67
68	if (result == (size_t)-1) {
69		DEBUG(0, ("srvstr_push failed\n"));
70		return -1;
71	}
72	set_message_bcc((char *)tmp, smb_buflen(tmp) + result);
73
74	*outbuf = tmp;
75
76	return result;
77}
78