1*05b00f60SXin Li /*
2*05b00f60SXin Li * Copyright (C) 2000, Richard Sharpe
3*05b00f60SXin Li *
4*05b00f60SXin Li * This software may be distributed either under the terms of the
5*05b00f60SXin Li * BSD-style license that accompanies tcpdump or under the GNU GPL
6*05b00f60SXin Li * version 2 or later.
7*05b00f60SXin Li *
8*05b00f60SXin Li * print-beep.c
9*05b00f60SXin Li *
10*05b00f60SXin Li */
11*05b00f60SXin Li
12*05b00f60SXin Li /* \summary: Blocks Extensible Exchange Protocol (BEEP) printer */
13*05b00f60SXin Li
14*05b00f60SXin Li #ifdef HAVE_CONFIG_H
15*05b00f60SXin Li #include <config.h>
16*05b00f60SXin Li #endif
17*05b00f60SXin Li
18*05b00f60SXin Li #include "netdissect-stdinc.h"
19*05b00f60SXin Li
20*05b00f60SXin Li #include <string.h>
21*05b00f60SXin Li
22*05b00f60SXin Li #include "netdissect.h"
23*05b00f60SXin Li
24*05b00f60SXin Li /* Check for a string but not go beyond length
25*05b00f60SXin Li * Return TRUE on match, FALSE otherwise
26*05b00f60SXin Li *
27*05b00f60SXin Li * Looks at the first few chars up to tl1 ...
28*05b00f60SXin Li */
29*05b00f60SXin Li
30*05b00f60SXin Li static int
l_strnstart(netdissect_options * ndo,const char * tstr1,u_int tl1,const char * str2,u_int l2)31*05b00f60SXin Li l_strnstart(netdissect_options *ndo, const char *tstr1, u_int tl1,
32*05b00f60SXin Li const char *str2, u_int l2)
33*05b00f60SXin Li {
34*05b00f60SXin Li if (!ND_TTEST_LEN(str2, tl1)) {
35*05b00f60SXin Li /*
36*05b00f60SXin Li * We don't have tl1 bytes worth of captured data
37*05b00f60SXin Li * for the string, so we can't check for this
38*05b00f60SXin Li * string.
39*05b00f60SXin Li */
40*05b00f60SXin Li return 0;
41*05b00f60SXin Li }
42*05b00f60SXin Li if (tl1 > l2)
43*05b00f60SXin Li return 0;
44*05b00f60SXin Li
45*05b00f60SXin Li return (strncmp(tstr1, str2, tl1) == 0 ? 1 : 0);
46*05b00f60SXin Li }
47*05b00f60SXin Li
48*05b00f60SXin Li void
beep_print(netdissect_options * ndo,const u_char * bp,u_int length)49*05b00f60SXin Li beep_print(netdissect_options *ndo, const u_char *bp, u_int length)
50*05b00f60SXin Li {
51*05b00f60SXin Li
52*05b00f60SXin Li ndo->ndo_protocol = "beep";
53*05b00f60SXin Li if (l_strnstart(ndo, "MSG", 4, (const char *)bp, length)) /* A REQuest */
54*05b00f60SXin Li ND_PRINT(" BEEP MSG");
55*05b00f60SXin Li else if (l_strnstart(ndo, "RPY ", 4, (const char *)bp, length))
56*05b00f60SXin Li ND_PRINT(" BEEP RPY");
57*05b00f60SXin Li else if (l_strnstart(ndo, "ERR ", 4, (const char *)bp, length))
58*05b00f60SXin Li ND_PRINT(" BEEP ERR");
59*05b00f60SXin Li else if (l_strnstart(ndo, "ANS ", 4, (const char *)bp, length))
60*05b00f60SXin Li ND_PRINT(" BEEP ANS");
61*05b00f60SXin Li else if (l_strnstart(ndo, "NUL ", 4, (const char *)bp, length))
62*05b00f60SXin Li ND_PRINT(" BEEP NUL");
63*05b00f60SXin Li else if (l_strnstart(ndo, "SEQ ", 4, (const char *)bp, length))
64*05b00f60SXin Li ND_PRINT(" BEEP SEQ");
65*05b00f60SXin Li else if (l_strnstart(ndo, "END", 4, (const char *)bp, length))
66*05b00f60SXin Li ND_PRINT(" BEEP END");
67*05b00f60SXin Li else
68*05b00f60SXin Li ND_PRINT(" BEEP (payload or undecoded)");
69*05b00f60SXin Li }
70