The Tcpdump Group git mirrors - tcpdump/blob - 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         u_int caplength;
  63         register int s;
  64
  65         caplength = (snapend >= cp) ? snapend - cp : 0;
  66         if (length > caplength)
  67                 length = caplength;
  68         putchar('\n');
  69         while (length > 0) {
  70                 s = *cp++;
  71                 length--;
  72                 if (!isgraph(s) &&
  73                     (s != '\t' && s != ' ' && s != '\n' && s != '\r'))
  74                         putchar('.');
  75                 else
  76                         putchar(s);
  77         }
  78 }
  79
  80 void
  81 hex_and_ascii_print_with_offset(register const char *ident,
  82     register const u_char *cp, register u_int length, register u_int oset)
  83 {
  84         u_int caplength;
  85         register u_int i;
  86         register int s1, s2;
  87         register int nshorts;
  88         char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
  89         char asciistuff[ASCII_LINELENGTH+1], *asp;
  90
  91         caplength = (snapend >= cp) ? snapend - cp : 0;
  92         if (length > caplength)
  93                 length = caplength;
  94         nshorts = length / sizeof(u_short);
  95         i = 0;
  96         hsp = hexstuff; asp = asciistuff;
  97         while (--nshorts >= 0) {
  98                 s1 = *cp++;
  99                 s2 = *cp++;
 100                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 101                     " %02x%02x", s1, s2);
 102                 hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
 103                 *(asp++) = (isgraph(s1) ? s1 : '.');
 104                 *(asp++) = (isgraph(s2) ? s2 : '.');
 105                 i++;
 106                 if (i >= HEXDUMP_SHORTS_PER_LINE) {
 107                         *hsp = *asp = '\0';
 108                         (void)printf("%s0x%04x: %-*s  %s",
 109                             ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 110                             hexstuff, asciistuff);
 111                         i = 0; hsp = hexstuff; asp = asciistuff;
 112                         oset += HEXDUMP_BYTES_PER_LINE;
 113                 }
 114         }
 115         if (length & 1) {
 116                 s1 = *cp++;
 117                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 118                     " %02x", s1);
 119                 hsp += 3;
 120                 *(asp++) = (isgraph(s1) ? s1 : '.');
 121                 ++i;
 122         }
 123         if (i > 0) {
 124                 *hsp = *asp = '\0';
 125                 (void)printf("%s0x%04x: %-*s  %s",
 126                      ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 127                      hexstuff, asciistuff);
 128         }
 129 }
 130
 131 void
 132 hex_and_ascii_print(register const char *ident, register const u_char *cp,
 133     register u_int length)
 134 {
 135         hex_and_ascii_print_with_offset(ident, cp, length, 0);
 136 }
 137
 138 /*
 139  * telnet_print() wants this.  It is essentially default_print_unaligned()
 140  */
 141 void
 142 hex_print_with_offset(register const char *ident, register const u_char *cp, register u_int length,
 143                       register u_int oset)
 144 {
 145         u_int caplength;
 146         register u_int i, s;
 147         register int nshorts;
 148
 149         caplength = (snapend >= cp) ? snapend - cp : 0;
 150         if (length > caplength)
 151                 length = caplength;
 152         nshorts = (u_int) length / sizeof(u_short);
 153         i = 0;
 154         while (--nshorts >= 0) {
 155                 if ((i++ % 8) == 0) {
 156                         (void)printf("%s0x%04x: ", ident, oset);
 157                         oset += HEXDUMP_BYTES_PER_LINE;
 158                 }
 159                 s = *cp++;
 160                 (void)printf(" %02x%02x", s, *cp++);
 161         }
 162         if (length & 1) {
 163                 if ((i % 8) == 0)
 164                         (void)printf("%s0x%04x: ", ident, oset);
 165                 (void)printf(" %02x", *cp);
 166         }
 167 }
 168
 169 /*
 170  * just for completeness
 171  */
 172 void
 173 hex_print(register const char *ident, register const u_char *cp, register u_int length)
 174 {
 175         hex_print_with_offset(ident, cp, length, 0);
 176 }
 177
 178 #ifdef MAIN
 179 int
 180 main(int argc, char *argv[])
 181 {
 182         hex_print("\n\t", "Hello, World!\n", 14);
 183         printf("\n");
 184         hex_and_ascii_print("\n\t", "Hello, World!\n", 14);
 185         printf("\n");
 186         ascii_print("Hello, World!\n", 14);
 187         printf("\n");
 188 #define TMSG "Now is the winter of our discontent...\n"
 189         hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 190         printf("\n");
 191         hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 192         printf("\n");
 193         exit(0);
 194 }
 195 #endif /* MAIN */