xref: /freebsd/contrib/tcpdump/print-beep.c (revision d6b92ffa)
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 
30 static int
31 l_strnstart(const char *tstr1, u_int tl1, const char *str2, u_int l2)
32 {
33 
34 	if (tl1 > l2)
35 		return 0;
36 
37 	return (strncmp(tstr1, str2, tl1) == 0 ? 1 : 0);
38 }
39 
40 void
41 beep_print(netdissect_options *ndo, const u_char *bp, u_int length)
42 {
43 
44 	if (l_strnstart("MSG", 4, (const char *)bp, length)) /* A REQuest */
45 		ND_PRINT((ndo, " BEEP MSG"));
46 	else if (l_strnstart("RPY ", 4, (const char *)bp, length))
47 		ND_PRINT((ndo, " BEEP RPY"));
48 	else if (l_strnstart("ERR ", 4, (const char *)bp, length))
49 		ND_PRINT((ndo, " BEEP ERR"));
50 	else if (l_strnstart("ANS ", 4, (const char *)bp, length))
51 		ND_PRINT((ndo, " BEEP ANS"));
52 	else if (l_strnstart("NUL ", 4, (const char *)bp, length))
53 		ND_PRINT((ndo, " BEEP NUL"));
54 	else if (l_strnstart("SEQ ", 4, (const char *)bp, length))
55 		ND_PRINT((ndo, " BEEP SEQ"));
56 	else if (l_strnstart("END", 4, (const char *)bp, length))
57 		ND_PRINT((ndo, " BEEP END"));
58 	else
59 		ND_PRINT((ndo, " BEEP (payload or undecoded)"));
60 }
61