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 #ifndef lint 19 static const char rcsid[] = 20 "@(#) $Header: /tcpdump/master/tcpdump/print-msdp.c,v 1.2 2001/12/10 08:06:40 guy Exp $"; 21 #endif 22 23 #ifdef HAVE_CONFIG_H 24 #include "config.h" 25 #endif 26 27 #include <stdio.h> 28 #include <stdlib.h> 29 #include <unistd.h> 30 31 #include <netinet/in.h> 32 33 #include "interface.h" 34 #include "addrtoname.h" 35 #include "extract.h" 36 37 #define MSDP_TYPE_MAX 7 38 39 void 40 msdp_print(const unsigned char *sp, u_int length) 41 { 42 unsigned int type, len; 43 44 TCHECK2(*sp, 3); 45 /* See if we think we're at the beginning of a compound packet */ 46 type = *sp; 47 len = EXTRACT_16BITS(sp + 1); 48 if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX) 49 goto trunc; /* not really truncated, but still not decodable */ 50 (void)printf(" msdp:"); 51 while (length > 0) { 52 TCHECK2(*sp, 3); 53 type = *sp; 54 len = EXTRACT_16BITS(sp + 1); 55 if (len > 1400 || vflag) 56 printf(" [len %d]", len); 57 if (len < 3) 58 goto trunc; 59 sp += 3; 60 length -= 3; 61 switch (type) { 62 case 1: /* IPv4 Source-Active */ 63 case 3: /* IPv4 Source-Active Response */ 64 if (type == 1) 65 (void)printf(" SA"); 66 else 67 (void)printf(" SA-Response"); 68 TCHECK(*sp); 69 (void)printf(" %d entries", *sp); 70 if (*sp * 12 + 8 < len) { 71 (void)printf(" [w/data]"); 72 if (vflag > 1) { 73 (void)printf(" "); 74 ip_print(sp + *sp * 12 + 8 - 3, 75 len - (*sp * 12 + 8)); 76 } 77 } 78 break; 79 case 2: 80 (void)printf(" SA-Request"); 81 TCHECK2(*sp, 5); 82 (void)printf(" for %s", ipaddr_string(sp + 1)); 83 break; 84 case 4: 85 (void)printf(" Keepalive"); 86 if (len != 3) 87 (void)printf("[len=%d] ", len); 88 break; 89 case 5: 90 (void)printf(" Notification"); 91 break; 92 default: 93 (void)printf(" [type=%d len=%d]", type, len); 94 break; 95 } 96 sp += (len - 3); 97 length -= (len - 3); 98 } 99 return; 100 trunc: 101 (void)printf(" [|msdp]"); 102 } 103