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_TTEST_LEN(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 ndo->ndo_protocol = "beep"; 53 if (l_strnstart(ndo, "MSG", 4, (const char *)bp, length)) /* A REQuest */ 54 ND_PRINT(" BEEP MSG"); 55 else if (l_strnstart(ndo, "RPY ", 4, (const char *)bp, length)) 56 ND_PRINT(" BEEP RPY"); 57 else if (l_strnstart(ndo, "ERR ", 4, (const char *)bp, length)) 58 ND_PRINT(" BEEP ERR"); 59 else if (l_strnstart(ndo, "ANS ", 4, (const char *)bp, length)) 60 ND_PRINT(" BEEP ANS"); 61 else if (l_strnstart(ndo, "NUL ", 4, (const char *)bp, length)) 62 ND_PRINT(" BEEP NUL"); 63 else if (l_strnstart(ndo, "SEQ ", 4, (const char *)bp, length)) 64 ND_PRINT(" BEEP SEQ"); 65 else if (l_strnstart(ndo, "END", 4, (const char *)bp, length)) 66 ND_PRINT(" BEEP END"); 67 else 68 ND_PRINT(" BEEP (payload or undecoded)"); 69 } 70