1 /* $OpenBSD: print-carp.c,v 1.5 2007/10/07 16:41:05 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 2000 William C. Fenner. 5 * All rights reserved. 6 * 7 * Kevin Steves <ks@hp.se> July 2000 8 * Modified to: 9 * - print version, type string and packet length 10 * - print IP address count if > 1 (-v) 11 * - verify checksum (-v) 12 * - print authentication string (-v) 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that: (1) source code 16 * distributions retain the above copyright notice and this paragraph 17 * in its entirety, and (2) distributions including binary code include 18 * the above copyright notice and this paragraph in its entirety in 19 * the documentation or other materials provided with the distribution. 20 * The name of William C. Fenner may not be used to endorse or 21 * promote products derived from this software without specific prior 22 * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND 23 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 24 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 25 * FOR A PARTICULAR PURPOSE. 26 * 27 * from tcpdump.org: 28 * Header: /tcpdump/master/tcpdump/print-vrrp.c,v 1.3 2000/10/10 05:05:08 guy Exp 29 */ 30 31 #ifndef lint 32 static const char rcsid[] = 33 "@(#) $Id: print-carp.c,v 1.5 2007/10/07 16:41:05 deraadt Exp $"; 34 #endif 35 36 #ifdef HAVE_CONFIG_H 37 #include "config.h" 38 #endif 39 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 44 #include <netinet/in.h> 45 46 #include "interface.h" 47 #include "extract.h" 48 #include "addrtoname.h" 49 50 void 51 carp_print(register const u_char *bp, register u_int len, int ttl) 52 { 53 int version, type; 54 char *type_s; 55 56 TCHECK(bp[0]); 57 version = (bp[0] & 0xf0) >> 4; 58 type = bp[0] & 0x0f; 59 if (type == 1) 60 type_s = "advertise"; 61 else 62 type_s = "unknown"; 63 printf("CARPv%d-%s %d: ", version, type_s, len); 64 if (ttl != 255) 65 printf("[ttl=%d!] ", ttl); 66 if (version != 2 || type != 1) 67 return; 68 TCHECK(bp[2]); 69 TCHECK(bp[5]); 70 printf("vhid=%d advbase=%d advskew=%d demote=%d", 71 bp[1], bp[5], bp[2], bp[4]); 72 if (vflag) { 73 if (TTEST2(bp[0], len) && in_cksum((const u_short*)bp, len, 0)) 74 printf(" (bad carp cksum %x!)", 75 EXTRACT_16BITS(&bp[6])); 76 } 77 return; 78 trunc: 79 printf("[|carp]"); 80 } 81