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 31 l_strnstart(netdissect_options *ndo, const char *tstr1, u_int tl1, 32 const char *str2, u_int l2) 33 { 34 if (!ND_TTEST2(*str2, tl1)) { 35 /* 36 * We don't have tl1 bytes worth of captured data 37 * for the string, so we can't check for this 38 * string. 39 */ 40 return 0; 41 } 42 if (tl1 > l2) 43 return 0; 44 45 return (strncmp(tstr1, str2, tl1) == 0 ? 1 : 0); 46 } 47 48 void 49 beep_print(netdissect_options *ndo, const u_char *bp, u_int length) 50 { 51 52 if (l_strnstart(ndo, "MSG", 4, (const char *)bp, length)) /* A REQuest */ 53 ND_PRINT((ndo, " BEEP MSG")); 54 else if (l_strnstart(ndo, "RPY ", 4, (const char *)bp, length)) 55 ND_PRINT((ndo, " BEEP RPY")); 56 else if (l_strnstart(ndo, "ERR ", 4, (const char *)bp, length)) 57 ND_PRINT((ndo, " BEEP ERR")); 58 else if (l_strnstart(ndo, "ANS ", 4, (const char *)bp, length)) 59 ND_PRINT((ndo, " BEEP ANS")); 60 else if (l_strnstart(ndo, "NUL ", 4, (const char *)bp, length)) 61 ND_PRINT((ndo, " BEEP NUL")); 62 else if (l_strnstart(ndo, "SEQ ", 4, (const char *)bp, length)) 63 ND_PRINT((ndo, " BEEP SEQ")); 64 else if (l_strnstart(ndo, "END", 4, (const char *)bp, length)) 65 ND_PRINT((ndo, " BEEP END")); 66 else 67 ND_PRINT((ndo, " BEEP (payload or undecoded)")); 68 } 69