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bpf_image.c

/*
 * 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.
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header$ (LBL)";
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <string.h>

#include "pcap-int.h"

#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif

char *
bpf_image(p, n)
      struct bpf_insn *p;
      int n;
{
      int v;
      char *fmt, *op;
      static char image[256];
      char operand[64];

      v = p->k;
      switch (p->code) {

      default:
            op = "unimp";
            fmt = "0x%x";
            v = p->code;
            break;

      case BPF_RET|BPF_K:
            op = "ret";
            fmt = "#%d";
            break;

      case BPF_RET|BPF_A:
            op = "ret";
            fmt = "";
            break;

      case BPF_LD|BPF_W|BPF_ABS:
            op = "ld";
            fmt = "[%d]";
            break;

      case BPF_LD|BPF_H|BPF_ABS:
            op = "ldh";
            fmt = "[%d]";
            break;

      case BPF_LD|BPF_B|BPF_ABS:
            op = "ldb";
            fmt = "[%d]";
            break;

      case BPF_LD|BPF_W|BPF_LEN:
            op = "ld";
            fmt = "#pktlen";
            break;

      case BPF_LD|BPF_W|BPF_IND:
            op = "ld";
            fmt = "[x + %d]";
            break;

      case BPF_LD|BPF_H|BPF_IND:
            op = "ldh";
            fmt = "[x + %d]";
            break;

      case BPF_LD|BPF_B|BPF_IND:
            op = "ldb";
            fmt = "[x + %d]";
            break;

      case BPF_LD|BPF_IMM:
            op = "ld";
            fmt = "#0x%x";
            break;

      case BPF_LDX|BPF_IMM:
            op = "ldx";
            fmt = "#0x%x";
            break;

      case BPF_LDX|BPF_MSH|BPF_B:
            op = "ldxb";
            fmt = "4*([%d]&0xf)";
            break;

      case BPF_LD|BPF_MEM:
            op = "ld";
            fmt = "M[%d]";
            break;

      case BPF_LDX|BPF_MEM:
            op = "ldx";
            fmt = "M[%d]";
            break;

      case BPF_ST:
            op = "st";
            fmt = "M[%d]";
            break;

      case BPF_STX:
            op = "stx";
            fmt = "M[%d]";
            break;

      case BPF_JMP|BPF_JA:
            op = "ja";
            fmt = "%d";
            v = n + 1 + p->k;
            break;

      case BPF_JMP|BPF_JGT|BPF_K:
            op = "jgt";
            fmt = "#0x%x";
            break;

      case BPF_JMP|BPF_JGE|BPF_K:
            op = "jge";
            fmt = "#0x%x";
            break;

      case BPF_JMP|BPF_JEQ|BPF_K:
            op = "jeq";
            fmt = "#0x%x";
            break;

      case BPF_JMP|BPF_JSET|BPF_K:
            op = "jset";
            fmt = "#0x%x";
            break;

      case BPF_JMP|BPF_JGT|BPF_X:
            op = "jgt";
            fmt = "x";
            break;

      case BPF_JMP|BPF_JGE|BPF_X:
            op = "jge";
            fmt = "x";
            break;

      case BPF_JMP|BPF_JEQ|BPF_X:
            op = "jeq";
            fmt = "x";
            break;

      case BPF_JMP|BPF_JSET|BPF_X:
            op = "jset";
            fmt = "x";
            break;

      case BPF_ALU|BPF_ADD|BPF_X:
            op = "add";
            fmt = "x";
            break;

      case BPF_ALU|BPF_SUB|BPF_X:
            op = "sub";
            fmt = "x";
            break;

      case BPF_ALU|BPF_MUL|BPF_X:
            op = "mul";
            fmt = "x";
            break;

      case BPF_ALU|BPF_DIV|BPF_X:
            op = "div";
            fmt = "x";
            break;

      case BPF_ALU|BPF_AND|BPF_X:
            op = "and";
            fmt = "x";
            break;

      case BPF_ALU|BPF_OR|BPF_X:
            op = "or";
            fmt = "x";
            break;

      case BPF_ALU|BPF_LSH|BPF_X:
            op = "lsh";
            fmt = "x";
            break;

      case BPF_ALU|BPF_RSH|BPF_X:
            op = "rsh";
            fmt = "x";
            break;

      case BPF_ALU|BPF_ADD|BPF_K:
            op = "add";
            fmt = "#%d";
            break;

      case BPF_ALU|BPF_SUB|BPF_K:
            op = "sub";
            fmt = "#%d";
            break;

      case BPF_ALU|BPF_MUL|BPF_K:
            op = "mul";
            fmt = "#%d";
            break;

      case BPF_ALU|BPF_DIV|BPF_K:
            op = "div";
            fmt = "#%d";
            break;

      case BPF_ALU|BPF_AND|BPF_K:
            op = "and";
            fmt = "#0x%x";
            break;

      case BPF_ALU|BPF_OR|BPF_K:
            op = "or";
            fmt = "#0x%x";
            break;

      case BPF_ALU|BPF_LSH|BPF_K:
            op = "lsh";
            fmt = "#%d";
            break;

      case BPF_ALU|BPF_RSH|BPF_K:
            op = "rsh";
            fmt = "#%d";
            break;

      case BPF_ALU|BPF_NEG:
            op = "neg";
            fmt = "";
            break;

      case BPF_MISC|BPF_TAX:
            op = "tax";
            fmt = "";
            break;

      case BPF_MISC|BPF_TXA:
            op = "txa";
            fmt = "";
            break;
      }
      (void)snprintf(operand, sizeof operand, fmt, v);
      (void)snprintf(image, sizeof image,
                  (BPF_CLASS(p->code) == BPF_JMP &&
                   BPF_OP(p->code) != BPF_JA) ?
                  "(%03d) %-8s %-16s jt %d\tjf %d"
                  : "(%03d) %-8s %s",
                  n, op, operand, n + 1 + p->jt, n + 1 + p->jf);
      return image;
}

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