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      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 #include <sys/cdefs.h>
     13 #ifndef lint
     14 __RCSID("$NetBSD: print-beep.c,v 1.9 2024/09/02 16:15:30 christos Exp $");
     15 #endif
     16 
     17 /* \summary: Blocks Extensible Exchange Protocol (BEEP) printer */
     18 
     19 #include <config.h>
     20 
     21 #include "netdissect-stdinc.h"
     22 
     23 #include <string.h>
     24 
     25 #include "netdissect.h"
     26 
     27 /* Check for a string but not go beyond length
     28  * Return TRUE on match, FALSE otherwise
     29  *
     30  * Looks at the first few chars up to tl1 ...
     31  */
     32 
     33 static int
     34 l_strnstart(netdissect_options *ndo, const char *tstr1, u_int tl1,
     35     const char *str2, u_int l2)
     36 {
     37 	if (!ND_TTEST_LEN(str2, tl1)) {
     38 		/*
     39 		 * We don't have tl1 bytes worth of captured data
     40 		 * for the string, so we can't check for this
     41 		 * string.
     42 		 */
     43 		return 0;
     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(netdissect_options *ndo, const u_char *bp, u_int length)
     53 {
     54 
     55 	ndo->ndo_protocol = "beep";
     56 	if (l_strnstart(ndo, "MSG", 4, (const char *)bp, length)) /* A REQuest */
     57 		ND_PRINT(" BEEP MSG");
     58 	else if (l_strnstart(ndo, "RPY ", 4, (const char *)bp, length))
     59 		ND_PRINT(" BEEP RPY");
     60 	else if (l_strnstart(ndo, "ERR ", 4, (const char *)bp, length))
     61 		ND_PRINT(" BEEP ERR");
     62 	else if (l_strnstart(ndo, "ANS ", 4, (const char *)bp, length))
     63 		ND_PRINT(" BEEP ANS");
     64 	else if (l_strnstart(ndo, "NUL ", 4, (const char *)bp, length))
     65 		ND_PRINT(" BEEP NUL");
     66 	else if (l_strnstart(ndo, "SEQ ", 4, (const char *)bp, length))
     67 		ND_PRINT(" BEEP SEQ");
     68 	else if (l_strnstart(ndo, "END", 4, (const char *)bp, length))
     69 		ND_PRINT(" BEEP END");
     70 	else
     71 		ND_PRINT(" BEEP (payload or undecoded)");
     72 }
     73