1 /* 2 * Copyright (c) 2001 William C. Fenner. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code 7 * distributions retain the above copyright notice and this paragraph 8 * in its entirety, and (2) distributions including binary code include 9 * the above copyright notice and this paragraph in its entirety in 10 * the documentation or other materials provided with the distribution. 11 * The name of William C. Fenner may not be used to endorse or 12 * promote products derived from this software without specific prior 13 * written permission. THIS SOFTWARE IS PROVIDED ``AS IS'' AND 14 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 15 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 16 * FOR A PARTICULAR PURPOSE. 17 */ 18 #include <sys/cdefs.h> 19 #ifndef lint 20 #if 0 21 static const char rcsid[] _U_ = 22 "@(#) Header: /tcpdump/master/tcpdump/print-msdp.c,v 1.7 2005-04-06 21:32:41 mcr Exp"; 23 #else 24 __RCSID("$NetBSD: print-msdp.c,v 1.2 2010/12/05 05:11:30 christos Exp $"); 25 #endif 26 #endif 27 28 #ifdef HAVE_CONFIG_H 29 #include "config.h" 30 #endif 31 32 #include <tcpdump-stdinc.h> 33 34 #include <stdio.h> 35 #include <stdlib.h> 36 37 #include "interface.h" 38 #include "addrtoname.h" 39 #include "extract.h" 40 41 #define MSDP_TYPE_MAX 7 42 43 void 44 msdp_print(const unsigned char *sp, u_int length) 45 { 46 unsigned int type, len; 47 48 TCHECK2(*sp, 3); 49 /* See if we think we're at the beginning of a compound packet */ 50 type = *sp; 51 len = EXTRACT_16BITS(sp + 1); 52 if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX) 53 goto trunc; /* not really truncated, but still not decodable */ 54 (void)printf(" msdp:"); 55 while (length > 0) { 56 TCHECK2(*sp, 3); 57 type = *sp; 58 len = EXTRACT_16BITS(sp + 1); 59 if (len > 1400 || vflag) 60 printf(" [len %u]", len); 61 if (len < 3) 62 goto trunc; 63 sp += 3; 64 length -= 3; 65 switch (type) { 66 case 1: /* IPv4 Source-Active */ 67 case 3: /* IPv4 Source-Active Response */ 68 if (type == 1) 69 (void)printf(" SA"); 70 else 71 (void)printf(" SA-Response"); 72 TCHECK(*sp); 73 (void)printf(" %u entries", *sp); 74 if ((u_int)((*sp * 12) + 8) < len) { 75 (void)printf(" [w/data]"); 76 if (vflag > 1) { 77 (void)printf(" "); 78 ip_print(gndo, sp + *sp * 12 + 8 - 3, 79 len - (*sp * 12 + 8)); 80 } 81 } 82 break; 83 case 2: 84 (void)printf(" SA-Request"); 85 TCHECK2(*sp, 5); 86 (void)printf(" for %s", ipaddr_string(sp + 1)); 87 break; 88 case 4: 89 (void)printf(" Keepalive"); 90 if (len != 3) 91 (void)printf("[len=%d] ", len); 92 break; 93 case 5: 94 (void)printf(" Notification"); 95 break; 96 default: 97 (void)printf(" [type=%d len=%d]", type, len); 98 break; 99 } 100 sp += (len - 3); 101 length -= (len - 3); 102 } 103 return; 104 trunc: 105 (void)printf(" [|msdp]"); 106 } 107 108 /* 109 * Local Variables: 110 * c-style: whitesmith 111 * c-basic-offset: 8 112 * End: 113 */ 114