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 "netdissect.h"
  47 #include "interface.h"
  48
  49 #define ASCII_LINELENGTH 300
  50 #define HEXDUMP_BYTES_PER_LINE 16
  51 #define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
  52 #define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
  53 #define HEXDUMP_HEXSTUFF_PER_LINE \
  54                 (HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)
  55
  56 void
  57 ascii_print(register const u_char *cp, register u_int length)
  58 {
  59         register int s;
  60
  61         putchar('\n');
  62         while (length > 0) {
  63                 s = *cp++;
  64                 length--;
  65                 if (!isgraph(s) &&
  66                     (s != '\t' && s != ' ' && s != '\n' && s != '\r'))
  67                         putchar('.');
  68                 else
  69                         putchar(s);
  70         }
  71 }
  72
  73 void
  74 hex_and_ascii_print_with_offset(register const char *ident,
  75     register const u_char *cp, register u_int length, register u_int oset)
  76 {
  77         register u_int i;
  78         register int s1, s2;
  79         register int nshorts;
  80         char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
  81         char asciistuff[ASCII_LINELENGTH+1], *asp;
  82
  83         nshorts = length / sizeof(u_short);
  84         i = 0;
  85         hsp = hexstuff; asp = asciistuff;
  86         while (--nshorts >= 0) {
  87                 s1 = *cp++;
  88                 s2 = *cp++;
  89                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
  90                     " %02x%02x", s1, s2);
  91                 hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
  92                 *(asp++) = (isgraph(s1) ? s1 : '.');
  93                 *(asp++) = (isgraph(s2) ? s2 : '.');
  94                 i++;
  95                 if (i >= HEXDUMP_SHORTS_PER_LINE) {
  96                         *hsp = *asp = '\0';
  97                         (void)printf("%s0x%04x: %-*s  %s",
  98                             ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
  99                             hexstuff, asciistuff);
 100                         i = 0; hsp = hexstuff; asp = asciistuff;
 101                         oset += HEXDUMP_BYTES_PER_LINE;
 102                 }
 103         }
 104         if (length & 1) {
 105                 s1 = *cp++;
 106                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 107                     " %02x", s1);
 108                 hsp += 3;
 109                 *(asp++) = (isgraph(s1) ? s1 : '.');
 110                 ++i;
 111         }
 112         if (i > 0) {
 113                 *hsp = *asp = '\0';
 114                 (void)printf("%s0x%04x: %-*s  %s",
 115                      ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 116                      hexstuff, asciistuff);
 117         }
 118 }
 119
 120 void
 121 hex_and_ascii_print(register const char *ident, register const u_char *cp,
 122     register u_int length)
 123 {
 124         hex_and_ascii_print_with_offset(ident, cp, length, 0);
 125 }
 126
 127 /*
 128  * telnet_print() wants this.  It is essentially default_print_unaligned()
 129  */
 130 void
 131 hex_print_with_offset(netdissect_options *ndo,
 132                       const char *ident, const u_char *cp, u_int length,
 133                       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)ND_PRINT((ndo,"%s0x%04x: ", ident, oset));
 143                   oset += HEXDUMP_BYTES_PER_LINE;
 144                 }
 145                 s = *cp++;
 146                 (void)ND_PRINT((ndo," %02x%02x", s, *cp++));
 147         }
 148         if (length & 1) {
 149                 if ((i % 8) == 0)
 150                   (void)ND_PRINT((ndo,"%s0x%04x: ", ident, oset));
 151                 (void)ND_PRINT((ndo," %02x", *cp));
 152         }
 153 }
 154
 155 /*
 156  * just for completeness
 157  */
 158 void
 159 hex_print(netdissect_options *ndo,const char *ident, const u_char *cp, u_int length)
 160 {
 161   hex_print_with_offset(ndo, 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 */