dist/tcpdump/print-ascii.c

   1 /*      $NetBSD: print-ascii.c,v 1.5 2007/07/24 11:53:42 drochner Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Alan Barrett and Simon J. Gerraty.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #ifdef HAVE_CONFIG_H
  33 #include "config.h"
  34 #endif
  35
  36 #include <sys/cdefs.h>
  37 #ifndef lint
  38 #if 0
  39 static const char rcsid[] _U_ =
  40      "@(#) Header: /tcpdump/master/tcpdump/print-ascii.c,v 1.16.2.1 2005/07/06 20:54:49 guy Exp";
  41 #else
  42 __RCSID("$NetBSD: print-ascii.c,v 1.5 2007/07/24 11:53:42 drochner Exp $");
  43 #endif
  44 #endif
  45 #include <tcpdump-stdinc.h>
  46 #include <stdio.h>
  47
  48 #include "interface.h"
  49
  50 #define ASCII_LINELENGTH 300
  51 #define HEXDUMP_BYTES_PER_LINE 16
  52 #define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
  53 #define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
  54 #define HEXDUMP_HEXSTUFF_PER_LINE \
  55                 (HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)
  56
  57 void
  58 ascii_print(register const u_char *cp, register u_int length)
  59 {
  60         register int s;
  61
  62         putchar('\n');
  63         while (length > 0) {
  64                 s = *cp++;
  65                 length--;
  66                 if (!isgraph(s) &&
  67                     (s != '\t' && s != ' ' && s != '\n' && s != '\r'))
  68                         putchar('.');
  69                 else
  70                         putchar(s);
  71         }
  72 }
  73
  74 void
  75 hex_and_ascii_print_with_offset(register const char *ident,
  76     register const u_char *cp, register u_int length, register u_int oset)
  77 {
  78         register u_int i;
  79         register int s1, s2;
  80         register int nshorts;
  81         char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
  82         char asciistuff[ASCII_LINELENGTH+1], *asp;
  83
  84         nshorts = length / sizeof(u_short);
  85         i = 0;
  86         hsp = hexstuff; asp = asciistuff;
  87         while (--nshorts >= 0) {
  88                 s1 = *cp++;
  89                 s2 = *cp++;
  90                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
  91                     " %02x%02x", s1, s2);
  92                 hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
  93                 *(asp++) = (isgraph(s1) ? s1 : '.');
  94                 *(asp++) = (isgraph(s2) ? s2 : '.');
  95                 i++;
  96                 if (i >= HEXDUMP_SHORTS_PER_LINE) {
  97                         *hsp = *asp = '\0';
  98                         (void)printf("%s0x%04x: %-*s  %s",
  99                             ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 100                             hexstuff, asciistuff);
 101                         i = 0; hsp = hexstuff; asp = asciistuff;
 102                         oset += HEXDUMP_BYTES_PER_LINE;
 103                 }
 104         }
 105         if (length & 1) {
 106                 s1 = *cp++;
 107                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 108                     " %02x", s1);
 109                 hsp += 3;
 110                 *(asp++) = (isgraph(s1) ? s1 : '.');
 111                 ++i;
 112         }
 113         if (i > 0) {
 114                 *hsp = *asp = '\0';
 115                 (void)printf("%s0x%04x: %-*s  %s",
 116                      ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 117                      hexstuff, asciistuff);
 118         }
 119 }
 120
 121 void
 122 hex_and_ascii_print(register const char *ident, register const u_char *cp,
 123     register u_int length)
 124 {
 125         hex_and_ascii_print_with_offset(ident, cp, length, 0);
 126 }
 127
 128 /*
 129  * telnet_print() wants this.  It is essentially default_print_unaligned()
 130  */
 131 void
 132 hex_print_with_offset(register const char *ident, register const u_char *cp, register u_int length,
 133                       register u_int oset)
 134 {
 135         register u_int i, s;
 136         register int nshorts;
 137
 138         nshorts = (u_int) length / sizeof(u_short);
 139         i = 0;
 140         while (--nshorts >= 0) {
 141                 if ((i++ % 8) == 0) {
 142                         (void)printf("%s0x%04x: ", ident, oset);
 143                         oset += HEXDUMP_BYTES_PER_LINE;
 144                 }
 145                 s = *cp++;
 146                 (void)printf(" %02x%02x", s, *cp++);
 147         }
 148         if (length & 1) {
 149                 if ((i % 8) == 0)
 150                         (void)printf("%s0x%04x: ", ident, oset);
 151                 (void)printf(" %02x", *cp);
 152         }
 153 }
 154
 155 /*
 156  * just for completeness
 157  */
 158 void
 159 hex_print(register const char *ident, register const u_char *cp, register u_int length)
 160 {
 161         hex_print_with_offset(ident, cp, length, 0);
 162 }
 163
 164 #ifdef MAIN
 165 int
 166 main(int argc, char *argv[])
 167 {
 168         hex_print("\n\t", "Hello, World!\n", 14);
 169         printf("\n");
 170         hex_and_ascii_print("\n\t", "Hello, World!\n", 14);
 171         printf("\n");
 172         ascii_print("Hello, World!\n", 14);
 173         printf("\n");
 174 #define TMSG "Now is the winter of our discontent...\n"
 175         hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 176         printf("\n");
 177         hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 178         printf("\n");
 179         exit(0);
 180 }
 181 #endif /* MAIN */