The Tcpdump Group git mirrors - tcpdump/blob - print-vqp.c

   1 /*
   2  * Copyright (c) 1998-2006 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  * support for the Cisco prop. VQP Protocol
  16  *
  17  * Original code by Carles Kishimoto <Carles.Kishimoto@bsc.es>
  18  */
  19
  20 #ifndef lint
  21 static const char rcsid[] _U_ =
  22     "@(#) $Header: /tcpdump/master/tcpdump/print-vqp.c,v 1.1 2006-03-03 22:31:16 hannes Exp $";
  23 #endif
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 #include "interface.h"
  36 #include "extract.h"
  37 #include "addrtoname.h"
  38
  39 #define VQP_VERSION                     1
  40 #define VQP_EXTRACT_VERSION(x) ((x)&0xFF)
  41
  42 /*
  43  * VQP common header
  44  *
  45  *  0                   1                   2                   3
  46  *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
  47  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  48  * |   Constant    | Packet type   |  Error Code   |    nitems     |
  49  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  50  * |                Packet Sequence Number (4 bytes)               |
  51  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  52  */
  53
  54 struct vqp_common_header_t {
  55     u_int8_t version;
  56     u_int8_t msg_type;
  57     u_int8_t error_code;
  58     u_int8_t nitems;
  59     u_int8_t sequence[4];
  60 };
  61
  62 struct vqp_tlv_reqjoinport_t {
  63     u_int8_t obj_type[4];
  64     u_int8_t obj_length[2];
  65 };
  66
  67 struct vqp_tlv_respvlan_t {
  68     u_int8_t obj_type[4];
  69     u_int8_t unknown1[8]; /* XXX */
  70     u_int8_t obj_length[2];
  71     u_int8_t unknown2[4]; /* XXX */
  72 };
  73
  74 #define VQP_OBJ_REQ_JOIN_PORT  0x01
  75 #define VQP_OBJ_RESP_VLAN      0x02
  76 #define VQP_OBJ_REQ_RECONFIRM  0x03
  77 #define VQP_OBJ_RESP_RECONFIRM 0x04
  78
  79 static const struct tok vqp_msg_type_values[] = {
  80     { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"},
  81     { VQP_OBJ_RESP_VLAN, "Response, VLAN"},
  82     { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"},
  83     { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"},
  84     { 0, NULL}
  85 };
  86
  87 static const struct tok vqp_error_code_values[] = {
  88     { 0x00, "No error"},
  89     { 0x03, "Access denied"},
  90     { 0x04, "Shutdown port"},
  91     { 0x05, "Wrong VTP domain"},
  92     { 0, NULL}
  93 };
  94
  95 /* FIXME the heading 0x0c looks ugly - those must be flags etc. */
  96 #define VQP_OBJ_IP_ADDRESS    0x0c01
  97 #define VQP_OBJ_PORT_NAME     0x0c02
  98 #define VQP_OBJ_VLAN_NAME     0x0c03
  99 #define VQP_OBJ_VTP_DOMAIN    0x0c04
 100 #define VQP_OBJ_ETHERNET_PKT  0x0c05
 101 #define VQP_OBJ_MAC_NULL      0x0c06
 102 #define VQP_OBJ_MAC_ADDRESS   0x0c08
 103
 104 static const struct tok vqp_obj_values[] = {
 105     { VQP_OBJ_IP_ADDRESS, "Client IP Address" },
 106     { VQP_OBJ_PORT_NAME, "Port Name" },
 107     { VQP_OBJ_VLAN_NAME, "VLAN Name" },
 108     { VQP_OBJ_VTP_DOMAIN, "VTP Domain" },
 109     { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" },
 110     { VQP_OBJ_MAC_NULL, "MAC Null" },
 111     { VQP_OBJ_MAC_ADDRESS, "MAC Address" },
 112     { 0, NULL}
 113 };
 114
 115 #define FALSE 0
 116 #define TRUE  1
 117
 118 void
 119 vqp_print(register const u_char *pptr, register u_int len)
 120 {
 121     const struct vqp_common_header_t *vqp_common_header;
 122     union {
 123         const struct vqp_tlv_reqjoinport_t *reqjoinport;
 124         const struct vqp_tlv_respvlan_t *respvlan;
 125     } vqp_tlv;
 126
 127     const u_char *tptr;
 128     u_int16_t vqp_obj_len;
 129     u_int32_t vqp_obj_type;
 130     int tlen, hexdump;
 131     u_int8_t nitems;
 132
 133     tptr=pptr;
 134     tlen = len;
 135     vqp_common_header = (const struct vqp_common_header_t *)pptr;
 136     TCHECK(*vqp_common_header);
 137
 138     /*
 139      * Sanity checking of the header.
 140      */
 141     if (VQP_EXTRACT_VERSION(vqp_common_header->version) != VQP_VERSION) {
 142         printf("VQP version %u packet not supported",
 143                VQP_EXTRACT_VERSION(vqp_common_header->version));
 144         return;
 145     }
 146
 147     /* in non-verbose mode just lets print the basic Message Type */
 148     if (vflag < 1) {
 149         printf("VQPv%u %s Message, error-code %s (%u), length %u",
 150                VQP_EXTRACT_VERSION(vqp_common_header->version),
 151                tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type),
 152                tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code),
 153                vqp_common_header->error_code,
 154                len);
 155         return;
 156     }
 157
 158     /* ok they seem to want to know everything - lets fully decode it */
 159     nitems = vqp_common_header->nitems;
 160     printf("\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u",
 161            VQP_EXTRACT_VERSION(vqp_common_header->version),
 162            tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type),
 163            tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code),
 164            vqp_common_header->error_code,
 165            EXTRACT_32BITS(&vqp_common_header->sequence),
 166            nitems,
 167            len);
 168
 169     /* skip VQP Common header */
 170     tptr+=sizeof(const struct vqp_common_header_t);
 171     tlen-=sizeof(const struct vqp_common_header_t);
 172
 173     while (nitems > 0) {
 174
 175         switch (vqp_common_header->msg_type) {
 176         case VQP_OBJ_REQ_JOIN_PORT:
 177             vqp_tlv.reqjoinport = (const struct vqp_tlv_reqjoinport_t *)tptr;
 178             vqp_obj_type = EXTRACT_32BITS(vqp_tlv.reqjoinport->obj_type);
 179             vqp_obj_len = EXTRACT_16BITS(vqp_tlv.reqjoinport->obj_length);
 180             tptr+=sizeof(struct vqp_tlv_reqjoinport_t);
 181             tlen-=sizeof(struct vqp_tlv_reqjoinport_t);
 182             break;
 183         case VQP_OBJ_RESP_VLAN:
 184             vqp_tlv.respvlan = (const struct vqp_tlv_respvlan_t *)tptr;
 185             vqp_obj_type = EXTRACT_32BITS(vqp_tlv.respvlan->obj_type);
 186             vqp_obj_len = EXTRACT_16BITS(vqp_tlv.respvlan->obj_length);
 187             tptr+=sizeof(struct vqp_tlv_respvlan_t);
 188             tlen-=sizeof(struct vqp_tlv_respvlan_t);
 189             break;
 190         default:
 191             /* bail - don't know the TLV format of the message type */
 192             return;
 193         }
 194
 195         /* did we capture enough for fully decoding the object ? */
 196         if (!TTEST2(*tptr, vqp_obj_len))
 197             goto trunc;
 198         hexdump=FALSE;
 199
 200         printf("\n\t  %s Object (0x%08x), length %u, value: ",
 201                tok2str(vqp_obj_values, "Unknown", vqp_obj_type),
 202                vqp_obj_type, vqp_obj_len);
 203
 204         /* basic sanity check */
 205         if (vqp_obj_type == 0 || vqp_obj_len ==0) {
 206             return;
 207         }
 208
 209         switch(vqp_obj_type) {
 210         case VQP_OBJ_IP_ADDRESS:
 211             printf("%s (0x%08x)", ipaddr_string(tptr), EXTRACT_32BITS(tptr));
 212             break;
 213             /* those objects have similar semantics - fall through */
 214         case VQP_OBJ_PORT_NAME:
 215         case VQP_OBJ_VLAN_NAME:
 216         case VQP_OBJ_VTP_DOMAIN:
 217         case VQP_OBJ_ETHERNET_PKT:
 218             safeputs(tptr, vqp_obj_len);
 219             break;
 220             /* those objects have similar semantics - fall through */
 221         case VQP_OBJ_MAC_ADDRESS:
 222         case VQP_OBJ_MAC_NULL:
 223               printf("%s", etheraddr_string(tptr));
 224               break;
 225         default:
 226             if (vflag <= 1)
 227                 print_unknown_data(tptr, "\n\t    ", vqp_obj_len);
 228             break;
 229         }
 230         tptr += vqp_obj_len;
 231         tlen -= vqp_obj_len;
 232         nitems--;
 233     }
 234     return;
 235 trunc:
 236     printf("\n\t[|VQP]");
 237 }