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      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[] _U_ =
     20     "@(#) $Header: /tcpdump/master/tcpdump/print-msdp.c,v 1.7 2005/04/06 21:32:41 mcr Exp $";
     21 #endif
     22 
     23 #ifdef HAVE_CONFIG_H
     24 #include "config.h"
     25 #endif
     26 
     27 #include <tcpdump-stdinc.h>
     28 
     29 #include <stdio.h>
     30 #include <stdlib.h>
     31 
     32 #include "interface.h"
     33 #include "addrtoname.h"
     34 #include "extract.h"
     35 
     36 #define MSDP_TYPE_MAX	7
     37 
     38 void
     39 msdp_print(const unsigned char *sp, u_int length)
     40 {
     41 	unsigned int type, len;
     42 
     43 	TCHECK2(*sp, 3);
     44 	/* See if we think we're at the beginning of a compound packet */
     45 	type = *sp;
     46 	len = EXTRACT_16BITS(sp + 1);
     47 	if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
     48 		goto trunc;	/* not really truncated, but still not decodable */
     49 	(void)printf(" msdp:");
     50 	while (length > 0) {
     51 		TCHECK2(*sp, 3);
     52 		type = *sp;
     53 		len = EXTRACT_16BITS(sp + 1);
     54 		if (len > 1400 || vflag)
     55 			printf(" [len %u]", len);
     56 		if (len < 3)
     57 			goto trunc;
     58 		sp += 3;
     59 		length -= 3;
     60 		switch (type) {
     61 		case 1:	/* IPv4 Source-Active */
     62 		case 3: /* IPv4 Source-Active Response */
     63 			if (type == 1)
     64 				(void)printf(" SA");
     65 			else
     66 				(void)printf(" SA-Response");
     67 			TCHECK(*sp);
     68 			(void)printf(" %u entries", *sp);
     69 			if ((u_int)((*sp * 12) + 8) < len) {
     70 				(void)printf(" [w/data]");
     71 				if (vflag > 1) {
     72 					(void)printf(" ");
     73 					ip_print(gndo, sp + *sp * 12 + 8 - 3,
     74 					         len - (*sp * 12 + 8));
     75 				}
     76 			}
     77 			break;
     78 		case 2:
     79 			(void)printf(" SA-Request");
     80 			TCHECK2(*sp, 5);
     81 			(void)printf(" for %s", ipaddr_string(sp + 1));
     82 			break;
     83 		case 4:
     84 			(void)printf(" Keepalive");
     85 			if (len != 3)
     86 				(void)printf("[len=%d] ", len);
     87 			break;
     88 		case 5:
     89 			(void)printf(" Notification");
     90 			break;
     91 		default:
     92 			(void)printf(" [type=%d len=%d]", type, len);
     93 			break;
     94 		}
     95 		sp += (len - 3);
     96 		length -= (len - 3);
     97 	}
     98 	return;
     99 trunc:
    100 	(void)printf(" [|msdp]");
    101 }
    102 
    103 /*
    104  * Local Variables:
    105  * c-style: whitesmith
    106  * c-basic-offset: 8
    107  * End:
    108  */
    109