xref: /freebsd/contrib/tcpdump/print-ascii.c (revision 7661de35d15f582ab33e3bd6b8d909601557e436)
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 #ifndef lint
44 static const char rcsid[] _U_ =
45      "@(#) $Header: /tcpdump/master/tcpdump/print-ascii.c,v 1.17 2005-07-06 20:53:32 guy Exp $";
46 #endif
47 #include <tcpdump-stdinc.h>
48 #include <stdio.h>
49 
50 #include "interface.h"
51 
52 #define ASCII_LINELENGTH 300
53 #define HEXDUMP_BYTES_PER_LINE 16
54 #define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
55 #define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
56 #define HEXDUMP_HEXSTUFF_PER_LINE \
57 		(HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)
58 
59 void
60 ascii_print(register const u_char *cp, register u_int length)
61 {
62 	register int s;
63 
64 	putchar('\n');
65 	while (length > 0) {
66 		s = *cp++;
67 		length--;
68 		if (!isgraph(s) &&
69 		    (s != '\t' && s != ' ' && s != '\n' && s != '\r'))
70 			putchar('.');
71 		else
72 			putchar(s);
73 	}
74 }
75 
76 void
77 hex_and_ascii_print_with_offset(register const char *ident,
78     register const u_char *cp, register u_int length, register u_int oset)
79 {
80 	register u_int i;
81 	register int s1, s2;
82 	register int nshorts;
83 	char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
84 	char asciistuff[ASCII_LINELENGTH+1], *asp;
85 
86 	nshorts = length / sizeof(u_short);
87 	i = 0;
88 	hsp = hexstuff; asp = asciistuff;
89 	while (--nshorts >= 0) {
90 		s1 = *cp++;
91 		s2 = *cp++;
92 		(void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
93 		    " %02x%02x", s1, s2);
94 		hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
95 		*(asp++) = (isgraph(s1) ? s1 : '.');
96 		*(asp++) = (isgraph(s2) ? s2 : '.');
97 		i++;
98 		if (i >= HEXDUMP_SHORTS_PER_LINE) {
99 			*hsp = *asp = '\0';
100 			(void)printf("%s0x%04x: %-*s  %s",
101 			    ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
102 			    hexstuff, asciistuff);
103 			i = 0; hsp = hexstuff; asp = asciistuff;
104 			oset += HEXDUMP_BYTES_PER_LINE;
105 		}
106 	}
107 	if (length & 1) {
108 		s1 = *cp++;
109 		(void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
110 		    " %02x", s1);
111 		hsp += 3;
112 		*(asp++) = (isgraph(s1) ? s1 : '.');
113 		++i;
114 	}
115 	if (i > 0) {
116 		*hsp = *asp = '\0';
117 		(void)printf("%s0x%04x: %-*s  %s",
118 		     ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
119 		     hexstuff, asciistuff);
120 	}
121 }
122 
123 void
124 hex_and_ascii_print(register const char *ident, register const u_char *cp,
125     register u_int length)
126 {
127 	hex_and_ascii_print_with_offset(ident, cp, length, 0);
128 }
129 
130 /*
131  * telnet_print() wants this.  It is essentially default_print_unaligned()
132  */
133 void
134 hex_print_with_offset(register const char *ident, register const u_char *cp, register u_int length,
135 		      register u_int oset)
136 {
137 	register u_int i, s;
138 	register int nshorts;
139 
140 	nshorts = (u_int) length / sizeof(u_short);
141 	i = 0;
142 	while (--nshorts >= 0) {
143 		if ((i++ % 8) == 0) {
144 			(void)printf("%s0x%04x: ", ident, oset);
145 			oset += HEXDUMP_BYTES_PER_LINE;
146 		}
147 		s = *cp++;
148 		(void)printf(" %02x%02x", s, *cp++);
149 	}
150 	if (length & 1) {
151 		if ((i % 8) == 0)
152 			(void)printf("%s0x%04x: ", ident, oset);
153 		(void)printf(" %02x", *cp);
154 	}
155 }
156 
157 /*
158  * just for completeness
159  */
160 void
161 hex_print(register const char *ident, register const u_char *cp, register u_int length)
162 {
163 	hex_print_with_offset(ident, cp, length, 0);
164 }
165 
166 #ifdef MAIN
167 int
168 main(int argc, char *argv[])
169 {
170 	hex_print("\n\t", "Hello, World!\n", 14);
171 	printf("\n");
172 	hex_and_ascii_print("\n\t", "Hello, World!\n", 14);
173 	printf("\n");
174 	ascii_print("Hello, World!\n", 14);
175 	printf("\n");
176 #define TMSG "Now is the winter of our discontent...\n"
177 	hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
178 	printf("\n");
179 	hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
180 	printf("\n");
181 	exit(0);
182 }
183 #endif /* MAIN */
184