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 #define NETDISSECT_REWORKED
  40 #ifdef HAVE_CONFIG_H
  41 #include "config.h"
  42 #endif
  43
  44 #include <tcpdump-stdinc.h>
  45 #include <stdio.h>
  46
  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(netdissect_options *ndo,
  58             register const u_char *cp, register u_int length)
  59 {
  60         register u_char s;
  61
  62         ND_PRINT((ndo, "\n"));
  63         while (length > 0) {
  64                 s = *cp++;
  65                 length--;
  66                 if (s == '\r') {
  67                         /*
  68                          * Don't print CRs at the end of the line; they
  69                          * don't belong at the ends of lines on UN*X,
  70                          * and the standard I/O library will give us one
  71                          * on Windows so we don't need to print one
  72                          * ourselves.
  73                          *
  74                          * In the middle of a line, just print a '.'.
  75                          */
  76                         if (length > 1 && *cp != '\n')
  77                                 ND_PRINT((ndo, "."));
  78                 } else {
  79                         if (!ND_ISGRAPH(s) &&
  80                             (s != '\t' && s != ' ' && s != '\n'))
  81                                 ND_PRINT((ndo, "."));
  82                         else
  83                                 ND_PRINT((ndo, "%c", s));
  84                 }
  85         }
  86 }
  87
  88 void
  89 hex_and_ascii_print_with_offset(netdissect_options *ndo, register const char *ident,
  90     register const u_char *cp, register u_int length, register u_int oset)
  91 {
  92         register u_int i;
  93         register int s1, s2;
  94         register int nshorts;
  95         char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
  96         char asciistuff[ASCII_LINELENGTH+1], *asp;
  97
  98         nshorts = length / sizeof(u_short);
  99         i = 0;
 100         hsp = hexstuff; asp = asciistuff;
 101         while (--nshorts >= 0) {
 102                 s1 = *cp++;
 103                 s2 = *cp++;
 104                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 105                     " %02x%02x", s1, s2);
 106                 hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
 107                 *(asp++) = (ND_ISGRAPH(s1) ? s1 : '.');
 108                 *(asp++) = (ND_ISGRAPH(s2) ? s2 : '.');
 109                 i++;
 110                 if (i >= HEXDUMP_SHORTS_PER_LINE) {
 111                         *hsp = *asp = '\0';
 112                         ND_PRINT((ndo, "%s0x%04x: %-*s  %s",
 113                             ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 114                             hexstuff, asciistuff));
 115                         i = 0; hsp = hexstuff; asp = asciistuff;
 116                         oset += HEXDUMP_BYTES_PER_LINE;
 117                 }
 118         }
 119         if (length & 1) {
 120                 s1 = *cp++;
 121                 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
 122                     " %02x", s1);
 123                 hsp += 3;
 124                 *(asp++) = (ND_ISGRAPH(s1) ? s1 : '.');
 125                 ++i;
 126         }
 127         if (i > 0) {
 128                 *hsp = *asp = '\0';
 129                 ND_PRINT((ndo, "%s0x%04x: %-*s  %s",
 130                      ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
 131                      hexstuff, asciistuff));
 132         }
 133 }
 134
 135 void
 136 hex_and_ascii_print(netdissect_options *ndo, register const char *ident,
 137     register const u_char *cp, register u_int length)
 138 {
 139         hex_and_ascii_print_with_offset(ndo, ident, cp, length, 0);
 140 }
 141
 142 /*
 143  * telnet_print() wants this.  It is essentially default_print_unaligned()
 144  */
 145 void
 146 hex_print_with_offset(netdissect_options *ndo,
 147                       const char *ident, const u_char *cp, u_int length,
 148                       u_int oset)
 149 {
 150         register u_int i, s;
 151         register int nshorts;
 152
 153         nshorts = (u_int) length / sizeof(u_short);
 154         i = 0;
 155         while (--nshorts >= 0) {
 156                 if ((i++ % 8) == 0) {
 157                         ND_PRINT((ndo,"%s0x%04x: ", ident, oset));
 158                         oset += HEXDUMP_BYTES_PER_LINE;
 159                 }
 160                 s = *cp++;
 161                 ND_PRINT((ndo," %02x%02x", s, *cp++));
 162         }
 163         if (length & 1) {
 164                 if ((i % 8) == 0)
 165                         ND_PRINT((ndo,"%s0x%04x: ", ident, oset));
 166                 ND_PRINT((ndo," %02x", *cp));
 167         }
 168 }
 169
 170 /*
 171  * just for completeness
 172  */
 173 void
 174 hex_print(netdissect_options *ndo,const char *ident, const u_char *cp, u_int length)
 175 {
 176   hex_print_with_offset(ndo, ident, cp, length, 0);
 177 }
 178
 179 #ifdef MAIN
 180 int
 181 main(int argc, char *argv[])
 182 {
 183         hex_print("\n\t", "Hello, World!\n", 14);
 184         printf("\n");
 185         hex_and_ascii_print("\n\t", "Hello, World!\n", 14);
 186         printf("\n");
 187         ascii_print("Hello, World!\n", 14);
 188         printf("\n");
 189 #define TMSG "Now is the winter of our discontent...\n"
 190         hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 191         printf("\n");
 192         hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
 193         printf("\n");
 194         exit(0);
 195 }
 196 #endif /* MAIN */