/*
* Copyright (C) 2000, Richard Sharpe
*
* This software may be distributed either under the terms of the
* BSD-style license that accompanies tcpdump or under the GNU GPL
* version 2 or later.
*
* print-beep.c
*
*/

#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-beep.c,v 1.9 2024/09/02 16:15:30 christos Exp $");
#endif

/* \summary: Blocks Extensible Exchange Protocol (BEEP) printer */

#include <config.h>

#include "netdissect-stdinc.h"

#include <string.h>

#include "netdissect.h"

/* Check for a string but not go beyond length
* Return TRUE on match, FALSE otherwise
*
* Looks at the first few chars up to tl1 ...
*/

static int
l_strnstart(netdissect_options *ndo, const char *tstr1, u_int tl1,
   const char *str2, u_int l2)
{
       if (!ND_TTEST_LEN(str2, tl1)) {
               /*
                * We don't have tl1 bytes worth of captured data
                * for the string, so we can't check for this
                * string.
                */
               return 0;
       }
       if (tl1 > l2)
               return 0;

       return (strncmp(tstr1, str2, tl1) == 0 ? 1 : 0);
}

void
beep_print(netdissect_options *ndo, const u_char *bp, u_int length)
{

       ndo->ndo_protocol = "beep";
       if (l_strnstart(ndo, "MSG", 4, (const char *)bp, length)) /* A REQuest */
               ND_PRINT(" BEEP MSG");
       else if (l_strnstart(ndo, "RPY ", 4, (const char *)bp, length))
               ND_PRINT(" BEEP RPY");
       else if (l_strnstart(ndo, "ERR ", 4, (const char *)bp, length))
               ND_PRINT(" BEEP ERR");
       else if (l_strnstart(ndo, "ANS ", 4, (const char *)bp, length))
               ND_PRINT(" BEEP ANS");
       else if (l_strnstart(ndo, "NUL ", 4, (const char *)bp, length))
               ND_PRINT(" BEEP NUL");
       else if (l_strnstart(ndo, "SEQ ", 4, (const char *)bp, length))
               ND_PRINT(" BEEP SEQ");
       else if (l_strnstart(ndo, "END", 4, (const char *)bp, length))
               ND_PRINT(" BEEP END");
       else
               ND_PRINT(" BEEP (payload or undecoded)");
}