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 /* \summary: ASCII packet dump printer */
40
41 #ifdef HAVE_CONFIG_H
42 #include "config.h"
43 #endif
44
45 #include <netdissect-stdinc.h>
46 #include <stdio.h>
47
48 #include "netdissect.h"
49
50 #define ASCII_LINELENGTH 300
51 #define HEXDUMP_BYTES_PER_LINE 16
52 #define HEXDUMP_SHORTS_PER_LINE (HEXDUMP_BYTES_PER_LINE / 2)
53 #define HEXDUMP_HEXSTUFF_PER_SHORT 5 /* 4 hex digits and a space */
54 #define HEXDUMP_HEXSTUFF_PER_LINE \
55 (HEXDUMP_HEXSTUFF_PER_SHORT * HEXDUMP_SHORTS_PER_LINE)
56
57 void
ascii_print(netdissect_options * ndo,const u_char * cp,u_int length)58 ascii_print(netdissect_options *ndo,
59 const u_char *cp, u_int length)
60 {
61 u_int caplength;
62 register u_char s;
63
64 caplength = (ndo->ndo_snapend >= cp) ? ndo->ndo_snapend - cp : 0;
65 if (length > caplength)
66 length = caplength;
67 ND_PRINT((ndo, "\n"));
68 while (length > 0) {
69 s = *cp++;
70 length--;
71 if (s == '\r') {
72 /*
73 * Don't print CRs at the end of the line; they
74 * don't belong at the ends of lines on UN*X,
75 * and the standard I/O library will give us one
76 * on Windows so we don't need to print one
77 * ourselves.
78 *
79 * In the middle of a line, just print a '.'.
80 */
81 if (length > 1 && *cp != '\n')
82 ND_PRINT((ndo, "."));
83 } else {
84 if (!ND_ISGRAPH(s) &&
85 (s != '\t' && s != ' ' && s != '\n'))
86 ND_PRINT((ndo, "."));
87 else
88 ND_PRINT((ndo, "%c", s));
89 }
90 }
91 }
92
93 void
hex_and_ascii_print_with_offset(netdissect_options * ndo,register const char * ident,register const u_char * cp,register u_int length,register u_int oset)94 hex_and_ascii_print_with_offset(netdissect_options *ndo, register const char *ident,
95 register const u_char *cp, register u_int length, register u_int oset)
96 {
97 u_int caplength;
98 register u_int i;
99 register int s1, s2;
100 register int nshorts;
101 char hexstuff[HEXDUMP_SHORTS_PER_LINE*HEXDUMP_HEXSTUFF_PER_SHORT+1], *hsp;
102 char asciistuff[ASCII_LINELENGTH+1], *asp;
103
104 caplength = (ndo->ndo_snapend >= cp) ? ndo->ndo_snapend - cp : 0;
105 if (length > caplength)
106 length = caplength;
107 nshorts = length / sizeof(u_short);
108 i = 0;
109 hsp = hexstuff; asp = asciistuff;
110 while (--nshorts >= 0) {
111 s1 = *cp++;
112 s2 = *cp++;
113 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
114 " %02x%02x", s1, s2);
115 hsp += HEXDUMP_HEXSTUFF_PER_SHORT;
116 *(asp++) = (ND_ISGRAPH(s1) ? s1 : '.');
117 *(asp++) = (ND_ISGRAPH(s2) ? s2 : '.');
118 i++;
119 if (i >= HEXDUMP_SHORTS_PER_LINE) {
120 *hsp = *asp = '\0';
121 ND_PRINT((ndo, "%s0x%04x: %-*s %s",
122 ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
123 hexstuff, asciistuff));
124 i = 0; hsp = hexstuff; asp = asciistuff;
125 oset += HEXDUMP_BYTES_PER_LINE;
126 }
127 }
128 if (length & 1) {
129 s1 = *cp++;
130 (void)snprintf(hsp, sizeof(hexstuff) - (hsp - hexstuff),
131 " %02x", s1);
132 hsp += 3;
133 *(asp++) = (ND_ISGRAPH(s1) ? s1 : '.');
134 ++i;
135 }
136 if (i > 0) {
137 *hsp = *asp = '\0';
138 ND_PRINT((ndo, "%s0x%04x: %-*s %s",
139 ident, oset, HEXDUMP_HEXSTUFF_PER_LINE,
140 hexstuff, asciistuff));
141 }
142 }
143
144 void
hex_and_ascii_print(netdissect_options * ndo,register const char * ident,register const u_char * cp,register u_int length)145 hex_and_ascii_print(netdissect_options *ndo, register const char *ident,
146 register const u_char *cp, register u_int length)
147 {
148 hex_and_ascii_print_with_offset(ndo, ident, cp, length, 0);
149 }
150
151 /*
152 * telnet_print() wants this. It is essentially default_print_unaligned()
153 */
154 void
hex_print_with_offset(netdissect_options * ndo,const char * ident,const u_char * cp,u_int length,u_int oset)155 hex_print_with_offset(netdissect_options *ndo,
156 const char *ident, const u_char *cp, u_int length,
157 u_int oset)
158 {
159 u_int caplength;
160 register u_int i, s;
161 register int nshorts;
162
163 caplength = (ndo->ndo_snapend >= cp) ? ndo->ndo_snapend - cp : 0;
164 if (length > caplength)
165 length = caplength;
166 nshorts = (u_int) length / sizeof(u_short);
167 i = 0;
168 while (--nshorts >= 0) {
169 if ((i++ % 8) == 0) {
170 ND_PRINT((ndo,"%s0x%04x: ", ident, oset));
171 oset += HEXDUMP_BYTES_PER_LINE;
172 }
173 s = *cp++;
174 ND_PRINT((ndo," %02x%02x", s, *cp++));
175 }
176 if (length & 1) {
177 if ((i % 8) == 0)
178 ND_PRINT((ndo,"%s0x%04x: ", ident, oset));
179 ND_PRINT((ndo," %02x", *cp));
180 }
181 }
182
183 /*
184 * just for completeness
185 */
186 void
hex_print(netdissect_options * ndo,const char * ident,const u_char * cp,u_int length)187 hex_print(netdissect_options *ndo,const char *ident, const u_char *cp, u_int length)
188 {
189 hex_print_with_offset(ndo, ident, cp, length, 0);
190 }
191
192 #ifdef MAIN
193 int
main(int argc,char * argv[])194 main(int argc, char *argv[])
195 {
196 hex_print("\n\t", "Hello, World!\n", 14);
197 printf("\n");
198 hex_and_ascii_print("\n\t", "Hello, World!\n", 14);
199 printf("\n");
200 ascii_print("Hello, World!\n", 14);
201 printf("\n");
202 #define TMSG "Now is the winter of our discontent...\n"
203 hex_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
204 printf("\n");
205 hex_and_ascii_print_with_offset("\n\t", TMSG, sizeof(TMSG) - 1, 0x100);
206 printf("\n");
207 exit(0);
208 }
209 #endif /* MAIN */
210