mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-12-14 20:33:35 +08:00
ee68aa3646
The exceptions are currently: Some EXTRACT_ in print-juniper.c, not used on packet buffer pointer. An EXTRACT_BE_U_3 in addrtoname.c, not always used on packet buffer pointer.
222 lines
6.4 KiB
C
222 lines
6.4 KiB
C
/* $NetBSD: print-ascii.c,v 1.1 1999/09/30 14:49:12 sjg Exp $ */
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/*-
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* Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Alan Barrett and Simon J. Gerraty.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* \summary: ASCII packet dump printer */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "netdissect-stdinc.h"
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#include <stdio.h>
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#include "netdissect.h"
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#include "extract.h"
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#define ASCII_LINELENGTH 300
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#define HEXDUMP_BYTES_PER_LINE 16
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#define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
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#define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
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#define HEXDUMP_HEXSTUFF_PER_LINE \
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(HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)
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static void hex_and_ascii_print_with_offset(netdissect_options *, const char *, const u_char *, u_int, u_int);
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void
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ascii_print(netdissect_options *ndo,
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const u_char *cp, u_int length)
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{
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u_int caplength;
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u_char s;
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ndo->ndo_protocol = "ascii";
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caplength = (ndo->ndo_snapend > cp) ? ndo->ndo_snapend - cp : 0;
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if (length > caplength)
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length = caplength;
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ND_PRINT("\n");
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while (length > 0) {
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s = GET_U_1(cp);
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cp++;
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length--;
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if (s == '\r') {
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/*
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* Don't print CRs at the end of the line; they
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* don't belong at the ends of lines on UN*X,
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* and the standard I/O library will give us one
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* on Windows so we don't need to print one
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* ourselves.
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*
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* In the middle of a line, just print a '.'.
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*/
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if (length > 1 && GET_U_1(cp) != '\n')
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ND_PRINT(".");
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} else {
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if (!ND_ISGRAPH(s) &&
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(s != '\t' && s != ' ' && s != '\n'))
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ND_PRINT(".");
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else
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ND_PRINT("%c", s);
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}
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}
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}
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static void
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hex_and_ascii_print_with_offset(netdissect_options *ndo, const char *ident,
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const u_char *cp, u_int length, u_int oset)
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{
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u_int caplength;
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u_int i;
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u_int s1, s2;
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u_int nshorts;
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char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
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char asciistuff[ASCII_LINELENGTH+1], *asp;
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caplength = (ndo->ndo_snapend > cp) ? ndo->ndo_snapend - cp : 0;
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if (length > caplength)
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length = caplength;
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nshorts = length / sizeof(u_short);
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i = 0;
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hsp = hexstuff; asp = asciistuff;
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while (nshorts != 0) {
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s1 = GET_U_1(cp);
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cp++;
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s2 = GET_U_1(cp);
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cp++;
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(void)nd_snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
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" %02x%02x", s1, s2);
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hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
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*(asp++) = (char)(ND_ISGRAPH(s1) ? s1 : '.');
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*(asp++) = (char)(ND_ISGRAPH(s2) ? s2 : '.');
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i++;
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if (i >= HEXDUMP_SHORTS_PER_LINE) {
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*hsp = *asp = '\0';
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ND_PRINT("%s0x%04x: %-*s %s",
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ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
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hexstuff, asciistuff);
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i = 0; hsp = hexstuff; asp = asciistuff;
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oset += HEXDUMP_BYTES_PER_LINE;
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}
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nshorts--;
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}
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if (length & 1) {
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s1 = GET_U_1(cp);
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cp++;
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(void)nd_snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
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" %02x", s1);
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hsp += 3;
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*(asp++) = (char)(ND_ISGRAPH(s1) ? s1 : '.');
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++i;
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}
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if (i > 0) {
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*hsp = *asp = '\0';
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ND_PRINT("%s0x%04x: %-*s %s",
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ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
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hexstuff, asciistuff);
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}
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}
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void
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hex_and_ascii_print(netdissect_options *ndo, const char *ident,
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const u_char *cp, u_int length)
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{
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hex_and_ascii_print_with_offset(ndo, ident, cp, length, 0);
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}
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/*
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* telnet_print() wants this. It is essentially default_print_unaligned()
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*/
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void
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hex_print_with_offset(netdissect_options *ndo,
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const char *ident, const u_char *cp, u_int length,
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u_int oset)
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{
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u_int caplength;
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u_int i, s;
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u_int nshorts;
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caplength = (ndo->ndo_snapend > cp) ? ndo->ndo_snapend - cp : 0;
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if (length > caplength)
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length = caplength;
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nshorts = length / sizeof(u_short);
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i = 0;
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while (nshorts != 0) {
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if ((i++ % 8) == 0) {
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ND_PRINT("%s0x%04x: ", ident, oset);
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oset += HEXDUMP_BYTES_PER_LINE;
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}
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s = GET_U_1(cp);
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cp++;
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ND_PRINT(" %02x%02x", s, GET_U_1(cp));
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cp++;
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nshorts--;
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}
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if (length & 1) {
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if ((i % 8) == 0)
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ND_PRINT("%s0x%04x: ", ident, oset);
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ND_PRINT(" %02x", GET_U_1(cp));
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}
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}
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/*
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* just for completeness
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*/
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void
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hex_print(netdissect_options *ndo,const char *ident, const u_char *cp, u_int length)
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{
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hex_print_with_offset(ndo, ident, cp, length, 0);
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}
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#ifdef MAIN
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int
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main(int argc, char *argv[])
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{
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hex_print("\n\t", "Hello, World!\n", 14);
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printf("\n");
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hex_and_ascii_print("\n\t", "Hello, World!\n", 14);
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printf("\n");
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ascii_print("Hello, World!\n", 14);
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printf("\n");
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#define TMSG "Now is the winter of our discontent...\n"
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hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
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printf("\n");
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hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
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printf("\n");
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exit(0);
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}
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#endif /* MAIN */
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