b636d99d91
For now, printing of Sun RPC requests is disabled because we do not yet have the RPC header files. This should affect basically noone, as we do not have any RPC-based programs yet, for the same reason. Change-Id: Ie7818faaaacdc104d8b2c37a68866b4ce18247d6
154 lines
3.7 KiB
C
154 lines
3.7 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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*
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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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#define NETDISSECT_REWORKED
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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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uint8_t *
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cpack_next_boundary(uint8_t *buf, uint8_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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uint8_t *
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cpack_align_and_reserve(struct cpack_state *cs, size_t wordsize)
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{
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uint8_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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/* Advance by N bytes without returning them. */
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int
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cpack_advance(struct cpack_state *cs, const size_t toskip)
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{
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/* No space left? */
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if (cs->c_next - cs->c_buf + toskip > cs->c_len)
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return -1;
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cs->c_next += toskip;
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return 0;
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}
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int
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cpack_init(struct cpack_state *cs, uint8_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, uint64_t *u)
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{
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uint8_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 uint64_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, uint32_t *u)
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{
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uint8_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 uint32_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, uint16_t *u)
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{
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uint8_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 uint16_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, uint8_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 uint8_t. */
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cs->c_next++;
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return 0;
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}
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