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/*
Unix SMB/CIFS implementation.
server specific string routines
Copyright (C) Andrew Tridgell 2001
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
extern int max_send;
/* Make sure we can't write a string past the end of the buffer */
size_t srvstr_push_fn(const char *function, unsigned int line,
const char *base_ptr, uint16 smb_flags2, void *dest,
const char *src, int dest_len, int flags)
{
size_t buf_used = PTR_DIFF(dest, base_ptr);
if (dest_len == -1) {
if (((ptrdiff_t)dest < (ptrdiff_t)base_ptr) || (buf_used > (size_t)max_send)) {
#if 0
DEBUG(0, ("Pushing string of 'unlimited' length into non-SMB buffer!\n"));
#endif
return push_string_fn(function, line, base_ptr,
smb_flags2, dest, src, -1,
flags);
}
return push_string_fn(function, line, base_ptr, smb_flags2,
dest, src, max_send - buf_used, flags);
}
/* 'normal' push into size-specified buffer */
return push_string_fn(function, line, base_ptr, smb_flags2, dest, src,
dest_len, flags);
}
/*******************************************************************
Add a string to the end of a smb_buf, adjusting bcc and smb_len.
Return the bytes added
********************************************************************/
ssize_t message_push_string(uint8 **outbuf, const char *str, int flags)
{
size_t buf_size = smb_len(*outbuf) + 4;
size_t grow_size;
size_t result;
uint8 *tmp;
/*
* We need to over-allocate, now knowing what srvstr_push will
* actually use. This is very generous by incorporating potential
* padding, the terminating 0 and at most 4 chars per UTF-16 code
* point.
*/
grow_size = (strlen(str) + 2) * 4;
if (!(tmp = TALLOC_REALLOC_ARRAY(NULL, *outbuf, uint8,
buf_size + grow_size))) {
DEBUG(0, ("talloc failed\n"));
return -1;
}
result = srvstr_push((char *)tmp, SVAL(tmp, smb_flg2),
tmp + buf_size, str, grow_size, flags);
if (result == (size_t)-1) {
DEBUG(0, ("srvstr_push failed\n"));
return -1;
}
set_message_bcc((char *)tmp, smb_buflen(tmp) + result);
*outbuf = tmp;
return result;
}
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