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
l_strnstart(const char * tstr1,u_int tl1,const char * str2,u_int l2)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
beep_print(netdissect_options * ndo,const u_char * bp,u_int length)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