mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-12-01 05:53:38 +08:00
54db122321
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.
145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/*-
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* Copyright (c) 2003, 2004 David Young. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of David Young may not be used to endorse or promote
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* products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY DAVID YOUNG ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DAVID
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* YOUNG BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <tcpdump-stdinc.h>
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#include "cpack.h"
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#include "extract.h"
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u_int8_t *
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cpack_next_boundary(u_int8_t *buf, u_int8_t *p, size_t alignment)
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{
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size_t misalignment = (size_t)(p - buf) % alignment;
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if (misalignment == 0)
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return p;
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return p + (alignment - misalignment);
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}
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/* Advance to the next wordsize boundary. Return NULL if fewer than
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* wordsize bytes remain in the buffer after the boundary. Otherwise,
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* return a pointer to the boundary.
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*/
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u_int8_t *
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cpack_align_and_reserve(struct cpack_state *cs, size_t wordsize)
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{
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u_int8_t *next;
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/* Ensure alignment. */
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next = cpack_next_boundary(cs->c_buf, cs->c_next, wordsize);
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/* Too little space for wordsize bytes? */
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if (next - cs->c_buf + wordsize > cs->c_len)
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return NULL;
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return next;
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}
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int
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cpack_init(struct cpack_state *cs, u_int8_t *buf, size_t buflen)
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{
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memset(cs, 0, sizeof(*cs));
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cs->c_buf = buf;
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cs->c_len = buflen;
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cs->c_next = cs->c_buf;
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return 0;
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}
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/* Unpack a 64-bit unsigned integer. */
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int
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cpack_uint64(struct cpack_state *cs, u_int64_t *u)
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{
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u_int8_t *next;
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if ((next = cpack_align_and_reserve(cs, sizeof(*u))) == NULL)
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return -1;
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*u = EXTRACT_LE_64BITS(next);
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/* Move pointer past the u_int64_t. */
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cs->c_next = next + sizeof(*u);
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return 0;
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}
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/* Unpack a 32-bit unsigned integer. */
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int
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cpack_uint32(struct cpack_state *cs, u_int32_t *u)
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{
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u_int8_t *next;
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if ((next = cpack_align_and_reserve(cs, sizeof(*u))) == NULL)
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return -1;
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*u = EXTRACT_LE_32BITS(next);
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/* Move pointer past the u_int32_t. */
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cs->c_next = next + sizeof(*u);
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return 0;
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}
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/* Unpack a 16-bit unsigned integer. */
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int
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cpack_uint16(struct cpack_state *cs, u_int16_t *u)
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{
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u_int8_t *next;
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if ((next = cpack_align_and_reserve(cs, sizeof(*u))) == NULL)
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return -1;
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*u = EXTRACT_LE_16BITS(next);
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/* Move pointer past the u_int16_t. */
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cs->c_next = next + sizeof(*u);
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return 0;
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}
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/* Unpack an 8-bit unsigned integer. */
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int
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cpack_uint8(struct cpack_state *cs, u_int8_t *u)
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{
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/* No space left? */
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if ((size_t)(cs->c_next - cs->c_buf) >= cs->c_len)
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return -1;
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*u = *cs->c_next;
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/* Move pointer past the u_int8_t. */
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cs->c_next++;
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return 0;
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}
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