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/* $OpenBSD: get.c,v 1.8 2009/10/27 23:59:52 deraadt Exp $ */
/*
* Copyright (c) 1993-2006 Mats O Jansson. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
*/
#include <sys/types.h>
#include "common/mopdef.h"
u_char
mopGetChar(u_char *pkt, int *idx)
{
u_char ret;
ret = pkt[*idx];
*idx = *idx + 1;
return (ret);
}
u_short
mopGetShort(u_char *pkt, int *idx)
{
u_short ret;
ret = pkt[*idx] + pkt[*idx+1]*256;
*idx = *idx + 2;
return (ret);
}
u_short
mopGetNShort(u_char *pkt, int *idx)
{
u_short ret;
ret = pkt[*idx]*256 + pkt[*idx+1];
*idx = *idx + 2;
return (ret);
}
u_long
mopGetLong(u_char *pkt, int *idx)
{
u_long ret;
ret = pkt[*idx] + pkt[*idx+1]*0x100 + pkt[*idx+2]*0x10000 +
pkt[*idx+3]*0x1000000;
*idx = *idx + 4;
return (ret);
}
void
mopGetMulti(u_char *pkt, int *idx, u_char *dest, int size)
{
int i;
for (i = 0; i < size; i++)
dest[i] = pkt[*idx+i];
*idx = *idx + size;
}
int
mopGetTrans(u_char *pkt, int trans)
{
u_short ptype;
if (trans == 0) {
ptype = pkt[12]*256 + pkt[13];
if (ptype < 1600)
trans = TRANS_8023;
else
trans = TRANS_ETHER;
}
return (trans);
}
void
mopGetHeader(u_char *pkt, int *idx, u_char **dst, u_char **src,
u_short *proto, int *len, int trans)
{
*dst = pkt;
*src = pkt + 6;
*idx = *idx + 12;
switch (trans) {
case TRANS_ETHER:
*proto = mopGetNShort(pkt, idx);
*len = (int)mopGetShort(pkt, idx);
break;
case TRANS_8023:
*len = (int)mopGetNShort(pkt, idx);
*idx = *idx + 6;
*proto = mopGetNShort(pkt, idx);
break;
}
}
u_short
mopGetLength(u_char *pkt, int trans)
{
switch (trans) {
case TRANS_ETHER:
return (pkt[14] + pkt[15]*256);
case TRANS_8023:
return (pkt[12]*256 + pkt[13]);
}
return (0);
}
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