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 "netdissect.h"
  51 #include "interface.h"
  52
  53 #define ASCII_LINELENGTH 300
  54 #define HEXDUMP_BYTES_PER_LINE 16
  55 #define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
  56 #define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
  57 #define HEXDUMP_HEXSTUFF_PER_LINE \
  58                 (HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)
  59
  60 void
  61 ascii_print(register const u_char *cp, register u_int length)
  62 {
  63         register int s;
  64
  65         putchar('\n');
  66         while (length > 0) {
  67                 s = *cp++;
  68                 length--;
  69                 if (!isgraph(s) &&
  70                     (s != '\t' && s != ' ' && s != '\n' && s != '\r'))
  71                         putchar('.');
  72                 else
  73                         putchar(s);
  74         }
  75 }
  76
  77 void
  78 hex_and_ascii_print_with_offset(register const char *ident,
  79     register const u_char *cp, register u_int length, register u_int oset)
  80 {
  81         register u_int i;
  82         register int s1, s2;
  83         register int nshorts;
  84         char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
  85         char asciistuff[ASCII_LINELENGTH+1], *asp;
  86
  87         nshorts = length / sizeof(u_short);
  88         i = 0;
  89         hsp = hexstuff; asp = asciistuff;
  90         while (--nshorts >= 0) {
  91                 s1 = *cp++;
  92                 s2 = *cp++;
  93                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
  94                     " %02x%02x", s1, s2);
  95                 hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
  96                 *(asp++) = (isgraph(s1) ? s1 : '.');
  97                 *(asp++) = (isgraph(s2) ? s2 : '.');
  98                 i++;
  99                 if (i >= HEXDUMP_SHORTS_PER_LINE) {
 100                         *hsp = *asp = '\0';
 101                         (void)printf("%s0x%04x: %-*s  %s",
 102                             ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 103                             hexstuff, asciistuff);
 104                         i = 0; hsp = hexstuff; asp = asciistuff;
 105                         oset += HEXDUMP_BYTES_PER_LINE;
 106                 }
 107         }
 108         if (length & 1) {
 109                 s1 = *cp++;
 110                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 111                     " %02x", s1);
 112                 hsp += 3;
 113                 *(asp++) = (isgraph(s1) ? s1 : '.');
 114                 ++i;
 115         }
 116         if (i > 0) {
 117                 *hsp = *asp = '\0';
 118                 (void)printf("%s0x%04x: %-*s  %s",
 119                      ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 120                      hexstuff, asciistuff);
 121         }
 122 }
 123
 124 void
 125 hex_and_ascii_print(register const char *ident, register const u_char *cp,
 126     register u_int length)
 127 {
 128         hex_and_ascii_print_with_offset(ident, cp, length, 0);
 129 }
 130
 131 /*
 132  * telnet_print() wants this.  It is essentially default_print_unaligned()
 133  */
 134 void
 135 hex_print_with_offset(netdissect_options *ndo,
 136                       const char *ident, const u_char *cp, u_int length,
 137                       u_int oset)
 138 {
 139         register u_int i, s;
 140         register int nshorts;
 141
 142         nshorts = (u_int) length / sizeof(u_short);
 143         i = 0;
 144         while (--nshorts >= 0) {
 145                 if ((i++ % 8) == 0) {
 146                   (void)ND_PRINT((ndo,"%s0x%04x: ", ident, oset));
 147                   oset += HEXDUMP_BYTES_PER_LINE;
 148                 }
 149                 s = *cp++;
 150                 (void)ND_PRINT((ndo," %02x%02x", s, *cp++));
 151         }
 152         if (length & 1) {
 153                 if ((i % 8) == 0)
 154                   (void)ND_PRINT((ndo,"%s0x%04x: ", ident, oset));
 155                 (void)ND_PRINT((ndo," %02x", *cp));
 156         }
 157 }
 158
 159 /*
 160  * just for completeness
 161  */
 162 void
 163 hex_print(netdissect_options *ndo,const char *ident, const u_char *cp, u_int length)
 164 {
 165   hex_print_with_offset(ndo, ident, cp, length, 0);
 166 }
 167
 168 #ifdef MAIN
 169 int
 170 main(int argc, char *argv[])
 171 {
 172         hex_print("\n\t", "Hello, World!\n", 14);
 173         printf("\n");
 174         hex_and_ascii_print("\n\t", "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         hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 180         printf("\n");
 181         hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 182         printf("\n");
 183         exit(0);
 184 }
 185 #endif /* MAIN */