contrib/tcpdump/print-ascii.c

   1 /*      $NetBSD: print-ascii.c,v 1.1 1999/09/30 14:49:12 sjg 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  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *        This product includes software developed by the NetBSD
  21  *        Foundation, Inc. and its contributors.
  22  * 4. Neither the name of The NetBSD Foundation nor the names of its
  23  *    contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  36  * POSSIBILITY OF SUCH DAMAGE.
  37  */
  38
  39 #ifdef HAVE_CONFIG_H
  40 #include "config.h"
  41 #endif
  42
  43 #ifndef lint
  44 static const char rcsid[] _U_ =
  45      "@(#) $Header: /tcpdump/master/tcpdump/print-ascii.c,v 1.17 2005-07-06 20:53:32 guy Exp $";
  46 #endif
  47 #include <tcpdump-stdinc.h>
  48 #include <stdio.h>
  49
  50 #include "interface.h"
  51
  52 #define ASCII_LINELENGTH 300
  53 #define HEXDUMP_BYTES_PER_LINE 16
  54 #define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
  55 #define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
  56 #define HEXDUMP_HEXSTUFF_PER_LINE \
  57                 (HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)
  58
  59 void
  60 ascii_print(register const u_char *cp, register u_int length)
  61 {
  62         register int s;
  63
  64         putchar('\n');
  65         while (length > 0) {
  66                 s = *cp++;
  67                 length--;
  68                 if (!isgraph(s) &&
  69                     (s != '\t' && s != ' ' && s != '\n' && s != '\r'))
  70                         putchar('.');
  71                 else
  72                         putchar(s);
  73         }
  74 }
  75
  76 void
  77 hex_and_ascii_print_with_offset(register const char *ident,
  78     register const u_char *cp, register u_int length, register u_int oset)
  79 {
  80         register u_int i;
  81         register int s1, s2;
  82         register int nshorts;
  83         char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
  84         char asciistuff[ASCII_LINELENGTH+1], *asp;
  85
  86         nshorts = length / sizeof(u_short);
  87         i = 0;
  88         hsp = hexstuff; asp = asciistuff;
  89         while (--nshorts >= 0) {
  90                 s1 = *cp++;
  91                 s2 = *cp++;
  92                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
  93                     " %02x%02x", s1, s2);
  94                 hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
  95                 *(asp++) = (isgraph(s1) ? s1 : '.');
  96                 *(asp++) = (isgraph(s2) ? s2 : '.');
  97                 i++;
  98                 if (i >= HEXDUMP_SHORTS_PER_LINE) {
  99                         *hsp = *asp = '\0';
 100                         (void)printf("%s0x%04x: %-*s  %s",
 101                             ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 102                             hexstuff, asciistuff);
 103                         i = 0; hsp = hexstuff; asp = asciistuff;
 104                         oset += HEXDUMP_BYTES_PER_LINE;
 105                 }
 106         }
 107         if (length & 1) {
 108                 s1 = *cp++;
 109                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 110                     " %02x", s1);
 111                 hsp += 3;
 112                 *(asp++) = (isgraph(s1) ? s1 : '.');
 113                 ++i;
 114         }
 115         if (i > 0) {
 116                 *hsp = *asp = '\0';
 117                 (void)printf("%s0x%04x: %-*s  %s",
 118                      ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 119                      hexstuff, asciistuff);
 120         }
 121 }
 122
 123 void
 124 hex_and_ascii_print(register const char *ident, register const u_char *cp,
 125     register u_int length)
 126 {
 127         hex_and_ascii_print_with_offset(ident, cp, length, 0);
 128 }
 129
 130 /*
 131  * telnet_print() wants this.  It is essentially default_print_unaligned()
 132  */
 133 void
 134 hex_print_with_offset(register const char *ident, register const u_char *cp, register u_int length,
 135                       register u_int oset)
 136 {
 137         register u_int i, s;
 138         register int nshorts;
 139
 140         nshorts = (u_int) length / sizeof(u_short);
 141         i = 0;
 142         while (--nshorts >= 0) {
 143                 if ((i++ % 8) == 0) {
 144                         (void)printf("%s0x%04x: ", ident, oset);
 145                         oset += HEXDUMP_BYTES_PER_LINE;
 146                 }
 147                 s = *cp++;
 148                 (void)printf(" %02x%02x", s, *cp++);
 149         }
 150         if (length & 1) {
 151                 if ((i % 8) == 0)
 152                         (void)printf("%s0x%04x: ", ident, oset);
 153                 (void)printf(" %02x", *cp);
 154         }
 155 }
 156
 157 /*
 158  * just for completeness
 159  */
 160 void
 161 hex_print(register const char *ident, register const u_char *cp, register u_int length)
 162 {
 163         hex_print_with_offset(ident, cp, length, 0);
 164 }
 165
 166 #ifdef MAIN
 167 int
 168 main(int argc, char *argv[])
 169 {
 170         hex_print("\n\t", "Hello, World!\n", 14);
 171         printf("\n");
 172         hex_and_ascii_print("\n\t", "Hello, World!\n", 14);
 173         printf("\n");
 174         ascii_print("Hello, World!\n", 14);
 175         printf("\n");
 176 #define TMSG "Now is the winter of our discontent...\n"
 177         hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 178         printf("\n");
 179         hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 180         printf("\n");
 181         exit(0);
 182 }
 183 #endif /* MAIN */