NetBSD/lib/libpcap/bpf_image.c

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/* $NetBSD: bpf_image.c,v 1.6 2000/10/10 19:12:48 is Exp $ */
/*
* Copyright (c) 1990, 1991, 1992, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
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#include <sys/cdefs.h>
#ifndef lint
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#if 0
static const char rcsid[] =
"@(#) Header: bpf_image.c,v 1.22 96/09/26 23:27:56 leres Exp (LBL)";
#else
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__RCSID("$NetBSD: bpf_image.c,v 1.6 2000/10/10 19:12:48 is Exp $");
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#endif
#endif
#include <sys/types.h>
#include <sys/time.h>
#include <stdio.h>
#include <string.h>
#include "pcap-int.h"
#include "gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
char *
bpf_image(p, n)
struct bpf_insn *p;
int n;
{
int v;
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char *op;
static char image[256];
char operand[64];
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operand[0] = 0;
v = p->k;
switch (p->code) {
default:
op = "unimp";
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snprintf(operand, sizeof operand, "0x%x", p->code);
break;
case BPF_RET|BPF_K:
op = "ret";
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goto immediate;
case BPF_RET|BPF_A:
op = "ret";
break;
case BPF_LD|BPF_W|BPF_ABS:
op = "ld";
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abs:
snprintf(operand, sizeof operand, "[%d]", v);
break;
case BPF_LD|BPF_H|BPF_ABS:
op = "ldh";
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goto abs;
case BPF_LD|BPF_B|BPF_ABS:
op = "ldb";
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goto abs;
case BPF_LD|BPF_W|BPF_LEN:
op = "ld";
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strlcpy(operand, "#pktlen", sizeof(operand));
break;
case BPF_LD|BPF_W|BPF_IND:
op = "ld";
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offset:
snprintf(operand, sizeof(operand), "[x + %d]", v);
break;
case BPF_LD|BPF_H|BPF_IND:
op = "ldh";
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goto offset;
case BPF_LD|BPF_B|BPF_IND:
op = "ldb";
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goto offset;
case BPF_LD|BPF_IMM:
op = "ld";
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goto immediate_hex;
case BPF_LDX|BPF_IMM:
op = "ldx";
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goto immediate_hex;
case BPF_LDX|BPF_MSH|BPF_B:
op = "ldxb";
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snprintf(operand, sizeof(operand), "4*([%d]&0xf)", v);
break;
case BPF_LD|BPF_MEM:
op = "ld";
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mem:
snprintf(operand, sizeof(operand), "M[%d]", v);
break;
case BPF_LDX|BPF_MEM:
op = "ldx";
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goto mem;
case BPF_ST:
op = "st";
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goto mem;
case BPF_STX:
op = "stx";
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goto mem;
case BPF_JMP|BPF_JA:
op = "ja";
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snprintf(operand, sizeof(operand), "%d", n + 1 + p->k);
break;
case BPF_JMP|BPF_JGT|BPF_K:
op = "jgt";
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goto immediate_hex;
case BPF_JMP|BPF_JGE|BPF_K:
op = "jge";
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goto immediate_hex;
case BPF_JMP|BPF_JEQ|BPF_K:
op = "jeq";
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goto immediate_hex;
case BPF_JMP|BPF_JSET|BPF_K:
op = "jset";
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goto immediate_hex;
case BPF_JMP|BPF_JGT|BPF_X:
op = "jgt";
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x:
strlcpy(operand, "x", sizeof(operand));
break;
case BPF_JMP|BPF_JGE|BPF_X:
op = "jge";
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goto x;
case BPF_JMP|BPF_JEQ|BPF_X:
op = "jeq";
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goto x;
case BPF_JMP|BPF_JSET|BPF_X:
op = "jset";
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goto x;
case BPF_ALU|BPF_ADD|BPF_X:
op = "add";
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goto x;
case BPF_ALU|BPF_SUB|BPF_X:
op = "sub";
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goto x;
case BPF_ALU|BPF_MUL|BPF_X:
op = "mul";
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goto x;
case BPF_ALU|BPF_DIV|BPF_X:
op = "div";
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goto x;
case BPF_ALU|BPF_AND|BPF_X:
op = "and";
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goto x;
case BPF_ALU|BPF_OR|BPF_X:
op = "or";
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goto x;
case BPF_ALU|BPF_LSH|BPF_X:
op = "lsh";
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goto x;
case BPF_ALU|BPF_RSH|BPF_X:
op = "rsh";
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goto x;
case BPF_ALU|BPF_ADD|BPF_K:
op = "add";
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goto immediate;
case BPF_ALU|BPF_SUB|BPF_K:
op = "sub";
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goto immediate;
case BPF_ALU|BPF_MUL|BPF_K:
op = "mul";
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goto immediate;
case BPF_ALU|BPF_DIV|BPF_K:
op = "div";
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immediate:
snprintf(operand, sizeof operand, "#%d", v);
break;
case BPF_ALU|BPF_AND|BPF_K:
op = "and";
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goto immediate_hex;
case BPF_ALU|BPF_OR|BPF_K:
op = "or";
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immediate_hex:
snprintf(operand, sizeof operand, "#0x%x", v);
break;
case BPF_ALU|BPF_LSH|BPF_K:
op = "lsh";
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goto immediate;
case BPF_ALU|BPF_RSH|BPF_K:
op = "rsh";
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goto immediate;
break;
case BPF_ALU|BPF_NEG:
op = "neg";
break;
case BPF_MISC|BPF_TAX:
op = "tax";
break;
case BPF_MISC|BPF_TXA:
op = "txa";
break;
}
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if (BPF_CLASS(p->code) == BPF_JMP &&
BPF_OP(p->code) != BPF_JA)
(void)snprintf(image, sizeof image,
"(%03d) %-8s %-16s jt %d\tjf %d",
n, op, operand, n + 1 + p->jt, n + 1 + p->jf);
else
(void)snprintf(image, sizeof image,
"(%03d) %-8s %s",
n, op, operand);
return image;
}