xref: /freebsd/contrib/tcpdump/print-beep.c (revision 8d20be1e22095c27faf8fe8b2f0d089739cc742e)
1 /*
2  * Copyright (C) 2000, Richard Sharpe
3  *
4  * This software may be distributed either under the terms of the
5  * BSD-style licence that accompanies tcpdump or under the GNU GPL
6  * version 2 or later.
7  *
8  * print-beep.c
9  *
10  */
11 
12 #ifndef lint
13 static const char rcsid[] _U_ =
14   "@(#) $Header: /tcpdump/master/tcpdump/print-beep.c,v 1.6 2003-11-16 09:36:13 guy Exp $";
15 #endif
16 
17 #ifdef HAVE_CONFIG_H
18 #include "config.h"
19 #endif
20 
21 #include <tcpdump-stdinc.h>
22 
23 #ifdef HAVE_MEMORY_H
24 #include <memory.h>
25 #endif
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 
30 #include "interface.h"
31 #include "extract.h"
32 
33 /* Check for a string but not go beyond length
34  * Return TRUE on match, FALSE otherwise
35  *
36  * Looks at the first few chars up to tl1 ...
37  */
38 
39 static int l_strnstart(const char *, u_int, const char *, u_int);
40 
41 static int
42 l_strnstart(const char *tstr1, u_int tl1, const char *str2, u_int l2)
43 {
44 
45 	if (tl1 > l2)
46 		return 0;
47 
48 	return (strncmp(tstr1, str2, tl1) == 0 ? 1 : 0);
49 }
50 
51 void
52 beep_print(const u_char *bp, u_int length)
53 {
54 
55 	if (l_strnstart("MSG", 4, (const char *)bp, length)) /* A REQuest */
56 		printf(" BEEP MSG");
57 	else if (l_strnstart("RPY ", 4, (const char *)bp, length))
58 		printf(" BEEP RPY");
59 	else if (l_strnstart("ERR ", 4, (const char *)bp, length))
60 		printf(" BEEP ERR");
61 	else if (l_strnstart("ANS ", 4, (const char *)bp, length))
62 		printf(" BEEP ANS");
63 	else if (l_strnstart("NUL ", 4, (const char *)bp, length))
64 		printf(" BEEP NUL");
65 	else if (l_strnstart("SEQ ", 4, (const char *)bp, length))
66 		printf(" BEEP SEQ");
67 	else if (l_strnstart("END", 4, (const char *)bp, length))
68 		printf(" BEEP END");
69 	else
70 		printf(" BEEP (payload or undecoded)");
71 }
72