1/*
2 * Copyright (C) 2000, Richard Sharpe
3 *
4 * This software may be distributed either under the terms of the
5 * BSD-style license that accompanies tcpdump or under the GNU GPL
6 * version 2 or later.
7 *
8 * print-beep.c
9 *
10 */
11
12/* \summary: Blocks Extensible Exchange Protocol (BEEP) printer */
13
14#ifdef HAVE_CONFIG_H
15#include "config.h"
16#endif
17
18#include <netdissect-stdinc.h>
19
20#include <string.h>
21
22#include "netdissect.h"
23
24/* Check for a string but not go beyond length
25 * Return TRUE on match, FALSE otherwise
26 *
27 * Looks at the first few chars up to tl1 ...
28 */
29
30static int
31l_strnstart(netdissect_options *ndo, const char *tstr1, u_int tl1,
32    const char *str2, u_int l2)
33{
34	if (!ND_TTEST2(*str2, tl1)) {
35		/*
36		 * We don't have tl1 bytes worth of captured data
37		 * for the string, so we can't check for this
38		 * string.
39		 */
40		return 0;
41	}
42	if (tl1 > l2)
43		return 0;
44
45	return (strncmp(tstr1, str2, tl1) == 0 ? 1 : 0);
46}
47
48void
49beep_print(netdissect_options *ndo, const u_char *bp, u_int length)
50{
51
52	if (l_strnstart(ndo, "MSG", 4, (const char *)bp, length)) /* A REQuest */
53		ND_PRINT((ndo, " BEEP MSG"));
54	else if (l_strnstart(ndo, "RPY ", 4, (const char *)bp, length))
55		ND_PRINT((ndo, " BEEP RPY"));
56	else if (l_strnstart(ndo, "ERR ", 4, (const char *)bp, length))
57		ND_PRINT((ndo, " BEEP ERR"));
58	else if (l_strnstart(ndo, "ANS ", 4, (const char *)bp, length))
59		ND_PRINT((ndo, " BEEP ANS"));
60	else if (l_strnstart(ndo, "NUL ", 4, (const char *)bp, length))
61		ND_PRINT((ndo, " BEEP NUL"));
62	else if (l_strnstart(ndo, "SEQ ", 4, (const char *)bp, length))
63		ND_PRINT((ndo, " BEEP SEQ"));
64	else if (l_strnstart(ndo, "END", 4, (const char *)bp, length))
65		ND_PRINT((ndo, " BEEP END"));
66	else
67		ND_PRINT((ndo, " BEEP (payload or undecoded)"));
68}
69