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