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      1 /*
      2  * Copyright (c) 1998-2007 The TCPDUMP project
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that: (1) source code
      6  * distributions retain the above copyright notice and this paragraph
      7  * in its entirety, and (2) distributions including binary code include
      8  * the above copyright notice and this paragraph in its entirety in
      9  * the documentation or other materials provided with the distribution.
     10  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
     11  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
     12  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     13  * FOR A PARTICULAR PURPOSE.
     14  *
     15  * Dynamic Trunk Protocol (DTP)
     16  *
     17  * Original code by Carles Kishimoto <carles.kishimoto (at) gmail.com>
     18  */
     19 
     20 #ifdef HAVE_CONFIG_H
     21 #include "config.h"
     22 #endif
     23 
     24 #include <tcpdump-stdinc.h>
     25 
     26 #include <stdio.h>
     27 #include <string.h>
     28 
     29 #include "interface.h"
     30 #include "addrtoname.h"
     31 #include "extract.h"
     32 #include "nlpid.h"
     33 
     34 #define DTP_HEADER_LEN			1
     35 #define DTP_DOMAIN_TLV			0x0001
     36 #define DTP_STATUS_TLV			0x0002
     37 #define DTP_DTP_TYPE_TLV		0x0003
     38 #define DTP_NEIGHBOR_TLV		0x0004
     39 
     40 static const struct tok dtp_tlv_values[] = {
     41     { DTP_DOMAIN_TLV, "Domain TLV"},
     42     { DTP_STATUS_TLV, "Status TLV"},
     43     { DTP_DTP_TYPE_TLV, "DTP type TLV"},
     44     { DTP_NEIGHBOR_TLV, "Neighbor TLV"},
     45     { 0, NULL}
     46 };
     47 
     48 void
     49 dtp_print (const u_char *pptr, u_int length)
     50 {
     51     int type, len;
     52     const u_char *tptr;
     53 
     54     if (length < DTP_HEADER_LEN)
     55         goto trunc;
     56 
     57     tptr = pptr;
     58 
     59     if (!TTEST2(*tptr, DTP_HEADER_LEN))
     60 	goto trunc;
     61 
     62     printf("DTPv%u, length %u",
     63            (*tptr),
     64            length);
     65 
     66     /*
     67      * In non-verbose mode, just print version.
     68      */
     69     if (vflag < 1) {
     70 	return;
     71     }
     72 
     73     tptr += DTP_HEADER_LEN;
     74 
     75     while (tptr < (pptr+length)) {
     76 
     77         if (!TTEST2(*tptr, 4))
     78             goto trunc;
     79 
     80 	type = EXTRACT_16BITS(tptr);
     81         len  = EXTRACT_16BITS(tptr+2);
     82 
     83         /* infinite loop check */
     84         if (type == 0 || len == 0) {
     85             return;
     86         }
     87 
     88         printf("\n\t%s (0x%04x) TLV, length %u",
     89                tok2str(dtp_tlv_values, "Unknown", type),
     90                type, len);
     91 
     92         switch (type) {
     93 	case DTP_DOMAIN_TLV:
     94 		printf(", %s", tptr+4);
     95 		break;
     96 
     97 	case DTP_STATUS_TLV:
     98 	case DTP_DTP_TYPE_TLV:
     99                 printf(", 0x%x", *(tptr+4));
    100                 break;
    101 
    102 	case DTP_NEIGHBOR_TLV:
    103                 printf(", %s", etheraddr_string(tptr+4));
    104                 break;
    105 
    106         default:
    107             break;
    108         }
    109         tptr += len;
    110     }
    111 
    112     return;
    113 
    114  trunc:
    115     printf("[|dtp]");
    116 }
    117 
    118 /*
    119  * Local Variables:
    120  * c-style: whitesmith
    121  * c-basic-offset: 4
    122  * End:
    123  */
    124