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