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