diff options
Diffstat (limited to 'contrib/tcpdump/print-carp.c')
-rw-r--r-- | contrib/tcpdump/print-carp.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-carp.c b/contrib/tcpdump/print-carp.c new file mode 100644 index 0000000..ba5be7c --- /dev/null +++ b/contrib/tcpdump/print-carp.c @@ -0,0 +1,88 @@ +/* $OpenBSD: print-carp.c,v 1.6 2009/10/27 23:59:55 deraadt Exp $ */ + +/* + * Copyright (c) 2000 William C. Fenner. + * All rights reserved. + * + * Kevin Steves <ks@hp.se> July 2000 + * Modified to: + * - print version, type string and packet length + * - print IP address count if > 1 (-v) + * - verify checksum (-v) + * - print authentication string (-v) + * + * Copyright (c) 2011 Advanced Computing Technologies + * George V. Neille-Neil + * + * Modified to: + * - work correctly with CARP + * - compile into the latest tcpdump + * - print out the counter + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that: (1) source code + * distributions retain the above copyright notice and this paragraph + * in its entirety, and (2) distributions including binary code include + * the above copyright notice and this paragraph in its entirety in + * the documentation or other materials provided with the distribution. + * The name of William C. Fenner may not be used to endorse or + * promote products derived from this software without specific prior + * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND + * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT + * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE. + * + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <tcpdump-stdinc.h> + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> + +#include <netinet/in.h> + +#include "interface.h" +#include "extract.h" +#include "addrtoname.h" + +void +carp_print(register const u_char *bp, register u_int len, int ttl) +{ + int version, type; + const char *type_s; + + TCHECK(bp[0]); + version = (bp[0] & 0xf0) >> 4; + type = bp[0] & 0x0f; + if (type == 1) + type_s = "advertise"; + else + type_s = "unknown"; + printf("CARPv%d-%s %d: ", version, type_s, len); + if (ttl != 255) + printf("[ttl=%d!] ", ttl); + if (version != 2 || type != 1) + return; + TCHECK(bp[2]); + TCHECK(bp[5]); + printf("vhid=%d advbase=%d advskew=%d authlen=%d ", + bp[1], bp[5], bp[2], bp[3]); + if (vflag) { + struct cksum_vec vec[1]; + vec[0].ptr = (const u_int8_t *)bp; + vec[0].len = len; + if (TTEST2(bp[0], len) && in_cksum(vec, 1)) + printf(" (bad carp cksum %x!)", + EXTRACT_16BITS(&bp[6])); + } + printf("counter=%" PRIu64, EXTRACT_64BITS(&bp[8])); + + return; +trunc: + printf("[|carp]"); +} |