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 #include <sys/cdefs.h> 13 #ifndef lint 14 __RCSID("$NetBSD: print-beep.c,v 1.4 2014/11/20 03:05:03 christos Exp $"); 15 #endif 16 17 #define NETDISSECT_REWORKED 18 #ifdef HAVE_CONFIG_H 19 #include "config.h" 20 #endif 21 22 #include <tcpdump-stdinc.h> 23 24 #include <string.h> 25 26 #include "interface.h" 27 28 /* Check for a string but not go beyond length 29 * Return TRUE on match, FALSE otherwise 30 * 31 * Looks at the first few chars up to tl1 ... 32 */ 33 34 static int 35 l_strnstart(const char *tstr1, u_int tl1, const char *str2, u_int l2) 36 { 37 38 if (tl1 > l2) 39 return 0; 40 41 return (strncmp(tstr1, str2, tl1) == 0 ? 1 : 0); 42 } 43 44 void 45 beep_print(netdissect_options *ndo, const u_char *bp, u_int length) 46 { 47 48 if (l_strnstart("MSG", 4, (const char *)bp, length)) /* A REQuest */ 49 ND_PRINT((ndo, " BEEP MSG")); 50 else if (l_strnstart("RPY ", 4, (const char *)bp, length)) 51 ND_PRINT((ndo, " BEEP RPY")); 52 else if (l_strnstart("ERR ", 4, (const char *)bp, length)) 53 ND_PRINT((ndo, " BEEP ERR")); 54 else if (l_strnstart("ANS ", 4, (const char *)bp, length)) 55 ND_PRINT((ndo, " BEEP ANS")); 56 else if (l_strnstart("NUL ", 4, (const char *)bp, length)) 57 ND_PRINT((ndo, " BEEP NUL")); 58 else if (l_strnstart("SEQ ", 4, (const char *)bp, length)) 59 ND_PRINT((ndo, " BEEP SEQ")); 60 else if (l_strnstart("END", 4, (const char *)bp, length)) 61 ND_PRINT((ndo, " BEEP END")); 62 else 63 ND_PRINT((ndo, " BEEP (payload or undecoded)")); 64 } 65