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 #define ASCII_LINELENGTH 300
  49 #define HEXDUMP_BYTES_PER_LINE 16
  50 #define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
  51 #define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
  52 #define HEXDUMP_HEXSTUFF_PER_LINE \
  53                 (HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)
  54
  55 void
  56 ascii_print(netdissect_options *ndo,
  57             const u_char *cp, u_int length)
  58 {
  59         u_int caplength;
  60         register u_char s;
  61
  62         caplength = (ndo->ndo_snapend >= cp) ? ndo->ndo_snapend - cp : 0;
  63         if (length > caplength)
  64                 length = caplength;
  65         ND_PRINT((ndo, "\n"));
  66         while (length > 0) {
  67                 s = *cp++;
  68                 length--;
  69                 if (s == '\r') {
  70                         /*
  71                          * Don't print CRs at the end of the line; they
  72                          * don't belong at the ends of lines on UN*X,
  73                          * and the standard I/O library will give us one
  74                          * on Windows so we don't need to print one
  75                          * ourselves.
  76                          *
  77                          * In the middle of a line, just print a '.'.
  78                          */
  79                         if (length > 1 && *cp != '\n')
  80                                 ND_PRINT((ndo, "."));
  81                 } else {
  82                         if (!ND_ISGRAPH(s) &&
  83                             (s != '\t' && s != ' ' && s != '\n'))
  84                                 ND_PRINT((ndo, "."));
  85                         else
  86                                 ND_PRINT((ndo, "%c", s));
  87                 }
  88         }
  89 }
  90
  91 void
  92 hex_and_ascii_print_with_offset(netdissect_options *ndo, register const char *ident,
  93     register const u_char *cp, register u_int length, register u_int oset)
  94 {
  95         u_int caplength;
  96         register u_int i;
  97         register int s1, s2;
  98         register int nshorts;
  99         char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
 100         char asciistuff[ASCII_LINELENGTH+1], *asp;
 101
 102         caplength = (ndo->ndo_snapend >= cp) ? ndo->ndo_snapend - cp : 0;
 103         if (length > caplength)
 104                 length = caplength;
 105         nshorts = length / sizeof(u_short);
 106         i = 0;
 107         hsp = hexstuff; asp = asciistuff;
 108         while (--nshorts >= 0) {
 109                 s1 = *cp++;
 110                 s2 = *cp++;
 111                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 112                     " %02x%02x", s1, s2);
 113                 hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
 114                 *(asp++) = (ND_ISGRAPH(s1) ? s1 : '.');
 115                 *(asp++) = (ND_ISGRAPH(s2) ? s2 : '.');
 116                 i++;
 117                 if (i >= HEXDUMP_SHORTS_PER_LINE) {
 118                         *hsp = *asp = '\0';
 119                         ND_PRINT((ndo, "%s0x%04x: %-*s  %s",
 120                             ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 121                             hexstuff, asciistuff));
 122                         i = 0; hsp = hexstuff; asp = asciistuff;
 123                         oset += HEXDUMP_BYTES_PER_LINE;
 124                 }
 125         }
 126         if (length & 1) {
 127                 s1 = *cp++;
 128                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 129                     " %02x", s1);
 130                 hsp += 3;
 131                 *(asp++) = (ND_ISGRAPH(s1) ? s1 : '.');
 132                 ++i;
 133         }
 134         if (i > 0) {
 135                 *hsp = *asp = '\0';
 136                 ND_PRINT((ndo, "%s0x%04x: %-*s  %s",
 137                      ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 138                      hexstuff, asciistuff));
 139         }
 140 }
 141
 142 void
 143 hex_and_ascii_print(netdissect_options *ndo, register const char *ident,
 144     register const u_char *cp, register u_int length)
 145 {
 146         hex_and_ascii_print_with_offset(ndo, ident, cp, length, 0);
 147 }
 148
 149 /*
 150  * telnet_print() wants this.  It is essentially default_print_unaligned()
 151  */
 152 void
 153 hex_print_with_offset(netdissect_options *ndo,
 154                       const char *ident, const u_char *cp, u_int length,
 155                       u_int oset)
 156 {
 157         u_int caplength;
 158         register u_int i, s;
 159         register int nshorts;
 160
 161         caplength = (ndo->ndo_snapend >= cp) ? ndo->ndo_snapend - cp : 0;
 162         if (length > caplength)
 163                 length = caplength;
 164         nshorts = (u_int) length / sizeof(u_short);
 165         i = 0;
 166         while (--nshorts >= 0) {
 167                 if ((i++ % 8) == 0) {
 168                         ND_PRINT((ndo,"%s0x%04x: ", ident, oset));
 169                         oset += HEXDUMP_BYTES_PER_LINE;
 170                 }
 171                 s = *cp++;
 172                 ND_PRINT((ndo," %02x%02x", s, *cp++));
 173         }
 174         if (length & 1) {
 175                 if ((i % 8) == 0)
 176                         ND_PRINT((ndo,"%s0x%04x: ", ident, oset));
 177                 ND_PRINT((ndo," %02x", *cp));
 178         }
 179 }
 180
 181 /*
 182  * just for completeness
 183  */
 184 void
 185 hex_print(netdissect_options *ndo,const char *ident, const u_char *cp, u_int length)
 186 {
 187   hex_print_with_offset(ndo, ident, cp, length, 0);
 188 }
 189
 190 #ifdef MAIN
 191 int
 192 main(int argc, char *argv[])
 193 {
 194         hex_print("\n\t", "Hello, World!\n", 14);
 195         printf("\n");
 196         hex_and_ascii_print("\n\t", "Hello, World!\n", 14);
 197         printf("\n");
 198         ascii_print("Hello, World!\n", 14);
 199         printf("\n");
 200 #define TMSG "Now is the winter of our discontent...\n"
 201         hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 202         printf("\n");
 203         hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 204         printf("\n");
 205         exit(0);
 206 }
 207 #endif /* MAIN */