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 #include <tcpdump-stdinc.h>
  44 #include <stdio.h>
  45
  46 #include "interface.h"
  47
  48 #ifndef lint
  49 static const char rcsid[] _U_ =
  50      "@(#) $Header: /tcpdump/master/tcpdump/print-ascii.c,v 1.11 2003-11-15 00:39:15 guy Exp $";
  51 #endif
  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_with_offset(register const u_char *cp, register u_int length,
  61                         register u_int oset)
  62 {
  63         register u_int i;
  64         register int s1, s2;
  65         register int nshorts;
  66         char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
  67         char asciistuff[ASCII_LINELENGTH+1], *asp;
  68         u_int maxlength = (Aflag ? ASCII_LINELENGTH : HEXDUMP_SHORTS_PER_LINE);
  69
  70         nshorts = length / sizeof(u_short);
  71         i = 0;
  72         hsp = hexstuff; asp = asciistuff;
  73         if (Aflag) *(asp++) = '\n';
  74         while (--nshorts >= 0) {
  75                 s1 = *cp++;
  76                 s2 = *cp++;
  77                 if (Aflag) {
  78                         i += 2;
  79                         *(asp++) = (isgraph(s1) ? s1 : (s1 != '\t' && s1 != ' ' && s1 != '\n' && s1 != '\r' ? '.' : s1) );
  80                         *(asp++) = (isgraph(s2) ? s2 : (s2 != '\t' && s2 != ' ' && s2 != '\n' && s2 != '\r' ? '.' : s2) );
  81                         if (s1 == '\n' || s2 == '\n') i = maxlength;
  82
  83                 } else {
  84                         (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
  85                             " %02x%02x", s1, s2);
  86                         hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
  87                         *(asp++) = (isgraph(s1) ? s1 : '.');
  88                         *(asp++) = (isgraph(s2) ? s2 : '.');
  89                         i++;
  90                 }
  91                 if (i >= maxlength) {
  92                         *hsp = *asp = '\0';
  93                         if (Aflag) {
  94                                 (void)printf("%s", asciistuff);
  95                         } else {
  96                                 (void)printf("\n0x%04x\t%-*s\t%s",
  97                                     oset, HEXDUMP_HEXSTUFF_PER_LINE,
  98                                     hexstuff, asciistuff);
  99                         }
 100                         i = 0; hsp = hexstuff; asp = asciistuff;
 101                         oset += HEXDUMP_BYTES_PER_LINE;
 102                 }
 103         }
 104         if (length & 1) {
 105                 s1 = *cp++;
 106                 if (Aflag) {
 107                         *(asp++) = (isgraph(s1) ? s1 : (s1 != '\t' && s1 != ' ' && s1 != '\n' && s1 != '\r' ? '.' : s1) );
 108                 } else {
 109                         (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 110                             " %02x", s1);
 111                         hsp += 3;
 112                         *(asp++) = (isgraph(s1) ? s1 : '.');
 113                 }
 114                 ++i;
 115         }
 116         if (i > 0) {
 117                 *hsp = *asp = '\0';
 118                 if (Aflag) {
 119                         (void)printf("\n%s", asciistuff);
 120                 } else {
 121                         (void)printf("\n0x%04x\t%-*s\t%s",
 122                              oset, HEXDUMP_HEXSTUFF_PER_LINE,
 123                              hexstuff, asciistuff);
 124                 }
 125         }
 126 }
 127
 128 void
 129 ascii_print(register const u_char *cp, register u_int length)
 130 {
 131         ascii_print_with_offset(cp, length, 0);
 132 }
 133
 134 /*
 135  * telnet_print() wants this.  It is essentially default_print_unaligned()
 136  */
 137 void
 138 hex_print_with_offset(register const u_char *cp, register u_int length,
 139                       register u_int oset)
 140 {
 141         register u_int i, s;
 142         register int nshorts;
 143
 144         nshorts = (u_int) length / sizeof(u_short);
 145         i = 0;
 146         while (--nshorts >= 0) {
 147                 if ((i++ % 8) == 0) {
 148                         (void)printf("\n0x%04x\t", oset);
 149                         oset += HEXDUMP_BYTES_PER_LINE;
 150                 }
 151                 s = *cp++;
 152                 (void)printf(" %02x%02x", s, *cp++);
 153         }
 154         if (length & 1) {
 155                 if ((i % 8) == 0)
 156                         (void)printf("\n0x%04x\t", oset);
 157                 (void)printf(" %02x", *cp);
 158         }
 159 }
 160
 161 /*
 162  * just for completeness
 163  */
 164 void
 165 hex_print(register const u_char *cp, register u_int length)
 166 {
 167         hex_print_with_offset(cp, length, 0);
 168 }
 169
 170 #ifdef MAIN
 171 int
 172 main(int argc, char *argv[])
 173 {
 174         hex_print("Hello, World!\n", 14);
 175         printf("\n");
 176         ascii_print("Hello, World!\n", 14);
 177         printf("\n");
 178 #define TMSG "Now is the winter of our discontent...\n"
 179         ascii_print_with_offset(TMSG, sizeof(TMSG) - 1, 0x100);
 180         printf("\n");
 181         exit(0);
 182 }
 183 #endif /* MAIN */