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_TTEST_LEN(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	ndo->ndo_protocol = "beep";
53	if (l_strnstart(ndo, "MSG", 4, (const char *)bp, length)) /* A REQuest */
54		ND_PRINT(" BEEP MSG");
55	else if (l_strnstart(ndo, "RPY ", 4, (const char *)bp, length))
56		ND_PRINT(" BEEP RPY");
57	else if (l_strnstart(ndo, "ERR ", 4, (const char *)bp, length))
58		ND_PRINT(" BEEP ERR");
59	else if (l_strnstart(ndo, "ANS ", 4, (const char *)bp, length))
60		ND_PRINT(" BEEP ANS");
61	else if (l_strnstart(ndo, "NUL ", 4, (const char *)bp, length))
62		ND_PRINT(" BEEP NUL");
63	else if (l_strnstart(ndo, "SEQ ", 4, (const char *)bp, length))
64		ND_PRINT(" BEEP SEQ");
65	else if (l_strnstart(ndo, "END", 4, (const char *)bp, length))
66		ND_PRINT(" BEEP END");
67	else
68		ND_PRINT(" BEEP (payload or undecoded)");
69}
70