| JP Abgrall | 53f17a9 | 2014-02-12 14:02:41 -0800 | [diff] [blame] | 1 | /* $OpenBSD: print-carp.c,v 1.6 2009/10/27 23:59:55 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 | * Copyright (c) 2011 Advanced Computing Technologies |
| 15 | * George V. Neille-Neil |
| 16 | * |
| 17 | * Modified to: |
| 18 | * - work correctly with CARP |
| 19 | * - compile into the latest tcpdump |
| 20 | * - print out the counter |
| 21 | * |
| 22 | * Redistribution and use in source and binary forms, with or without |
| 23 | * modification, are permitted provided that: (1) source code |
| 24 | * distributions retain the above copyright notice and this paragraph |
| 25 | * in its entirety, and (2) distributions including binary code include |
| 26 | * the above copyright notice and this paragraph in its entirety in |
| 27 | * the documentation or other materials provided with the distribution. |
| 28 | * The name of William C. Fenner may not be used to endorse or |
| 29 | * promote products derived from this software without specific prior |
| 30 | * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND |
| 31 | * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT |
| 32 | * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 33 | * FOR A PARTICULAR PURPOSE. |
| 34 | * |
| 35 | */ |
| 36 | |
| 37 | #ifdef HAVE_CONFIG_H |
| 38 | #include "config.h" |
| 39 | #endif |
| 40 | |
| 41 | #include <tcpdump-stdinc.h> |
| 42 | |
| 43 | #include <stdio.h> |
| 44 | #include <stdlib.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 | const 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 authlen=%d ", |
| 71 | bp[1], bp[5], bp[2], bp[3]); |
| 72 | if (vflag) { |
| 73 | struct cksum_vec vec[1]; |
| 74 | vec[0].ptr = (const u_int8_t *)bp; |
| 75 | vec[0].len = len; |
| 76 | if (TTEST2(bp[0], len) && in_cksum(vec, 1)) |
| 77 | printf(" (bad carp cksum %x!)", |
| 78 | EXTRACT_16BITS(&bp[6])); |
| 79 | } |
| 80 | printf("counter=%" PRIu64, EXTRACT_64BITS(&bp[8])); |
| 81 | |
| 82 | return; |
| 83 | trunc: |
| 84 | printf("[|carp]"); |
| 85 | } |