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tcpdump/cpack.h

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Add "cpack", a library for extracting 1-, 2-, 4-, and 8-octet words from a buffer. The cpack library expects for words to appear on their natural boundaries. The radiotap (802.11 + radio information) capture format uses cpack to extract the radio information fields.
2004-09-24 05:27:18 +08:00
/*-
* Copyright (c) 2003, 2004 David Young. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of David Young may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
* YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
Lose underscores in some macro names. [skip ci]
2020-09-13 23:06:43 +08:00
#ifndef ND_CPACK_H
#define ND_CPACK_H
Add "cpack", a library for extracting 1-, 2-, 4-, and 8-octet words from a buffer. The cpack library expects for words to appear on their natural boundaries. The radiotap (802.11 + radio information) capture format uses cpack to extract the radio information fields.
2004-09-24 05:27:18 +08:00
Add the ndo parameter to some functions This parameter will be needed at the next step.
2018-06-15 21:44:51 +08:00
#include "netdissect.h"
Add "cpack", a library for extracting 1-, 2-, 4-, and 8-octet words from a buffer. The cpack library expects for words to appear on their natural boundaries. The radiotap (802.11 + radio information) capture format uses cpack to extract the radio information fields.
2004-09-24 05:27:18 +08:00
struct cpack_state {
Fix a bunch of de-constifications.
2015-04-27 08:24:42 +08:00
const uint8_t *c_buf;
const uint8_t *c_next;
Add "cpack", a library for extracting 1-, 2-, 4-, and 8-octet words from a buffer. The cpack library expects for words to appear on their natural boundaries. The radiotap (802.11 + radio information) capture format uses cpack to extract the radio information fields.
2004-09-24 05:27:18 +08:00
size_t c_len;
};
Prefix all cpack function names with "nd_". [skip ci] Gisle Vanem reported in GH #881 that in Windows tcpdump failed to link with static AirPcap because the latter seems to include its own variant of cpack code: airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_init already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint16 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint32 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint64 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint8 already defined in cpack.obj He confirms this change resolves the issue.
2020-10-01 02:15:42 +08:00
int nd_cpack_init(struct cpack_state *, const uint8_t *, size_t);
Add "cpack", a library for extracting 1-, 2-, 4-, and 8-octet words from a buffer. The cpack library expects for words to appear on their natural boundaries. The radiotap (802.11 + radio information) capture format uses cpack to extract the radio information fields.
2004-09-24 05:27:18 +08:00
Prefix all cpack function names with "nd_". [skip ci] Gisle Vanem reported in GH #881 that in Windows tcpdump failed to link with static AirPcap because the latter seems to include its own variant of cpack code: airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_init already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint16 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint32 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint64 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint8 already defined in cpack.obj He confirms this change resolves the issue.
2020-10-01 02:15:42 +08:00
int nd_cpack_uint8(netdissect_options *, struct cpack_state *, uint8_t *);
int nd_cpack_int8(netdissect_options *, struct cpack_state *, int8_t *);
int nd_cpack_uint16(netdissect_options *, struct cpack_state *, uint16_t *);
int nd_cpack_int16(netdissect_options *, struct cpack_state *, int16_t *);
int nd_cpack_uint32(netdissect_options *, struct cpack_state *, uint32_t *);
int nd_cpack_int32(netdissect_options *, struct cpack_state *, int32_t *);
int nd_cpack_uint64(netdissect_options *, struct cpack_state *, uint64_t *);
int nd_cpack_int64(netdissect_options *, struct cpack_state *, int64_t *);
Add "cpack", a library for extracting 1-, 2-, 4-, and 8-octet words from a buffer. The cpack library expects for words to appear on their natural boundaries. The radiotap (802.11 + radio information) capture format uses cpack to extract the radio information fields.
2004-09-24 05:27:18 +08:00
Prefix all cpack function names with "nd_". [skip ci] Gisle Vanem reported in GH #881 that in Windows tcpdump failed to link with static AirPcap because the latter seems to include its own variant of cpack code: airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_init already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint16 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint32 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint64 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint8 already defined in cpack.obj He confirms this change resolves the issue.
2020-10-01 02:15:42 +08:00
const uint8_t *nd_cpack_next_boundary(const uint8_t *buf, const uint8_t *p, size_t alignment);
const uint8_t *nd_cpack_align_and_reserve(struct cpack_state *cs, size_t wordsize);
Support RX flags, MCS and the vendor namespace, and fix Rate. Based on patches from an anonymous donor, support the radiotap RX flags and MCS fields, and the vendor namespace, and, if Channel and XChannel are both present, use XChannel, not Channel. Do not try to look up a rate for an MCS value from the Rate field; you cannot map an MCS value to a rate without also knowing the channel width and guard interval length.
2011-04-28 03:08:27 +08:00
Prefix all cpack function names with "nd_". [skip ci] Gisle Vanem reported in GH #881 that in Windows tcpdump failed to link with static AirPcap because the latter seems to include its own variant of cpack code: airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_init already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint16 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint32 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint64 already defined in cpack.obj airpcap_static.lib(RadiotapDecode.obj) : error LNK2005: _cpack_uint8 already defined in cpack.obj He confirms this change resolves the issue.
2020-10-01 02:15:42 +08:00
extern int nd_cpack_advance(struct cpack_state *, const size_t);
fix bug #303 (DLT_IEEE802_11_RADIO ext. bitmaps) This bug was discovered and pinned down by Wim Torfs. The code in question handles DLT_IEEE802_11_RADIO datalink type, which consists of a variable-sized header, a variable number of fields and the actual 802.11 frame. The integers contained in the fields are aligned, properly extracting them is exactly the purpose of the existing "cpack" module. The issue with the current code is that it sets alignment base for cpack at the end of the variable-sized header, in other words, 64-bit integers would be properly extracted only so long as the header is 64-bit long, which only happens when the total number of bitmaps in it is odd (the minimum number of bitmaps is one). Once this condition isn't met, as is with two bitmaps, decoding becomes incorrect. The reporter's point that the alignment base must be the beginning of the variable-sized header is accurate. This commit adds a new cpack_advance() function to fast-forward the "c_next" pointer of a cpack_state context by an arbitrary number of octets. The ieee802_11_radio_print() function now uses it to skip the header and all its bitmaps, and the alignment base is now the header start.
2013-04-28 21:20:28 +08:00
Lose underscores in some macro names. [skip ci]
2020-09-13 23:06:43 +08:00
#endif /* ND_CPACK_H */
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