contrib/tcpdump/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 1.3 2006-08-19 06:51:13 guy 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_obj_tlv_t {
  63     u_int8_t obj_type[4];
  64     u_int8_t obj_length[2];
  65 };
  66
  67 #define VQP_OBJ_REQ_JOIN_PORT  0x01
  68 #define VQP_OBJ_RESP_VLAN      0x02
  69 #define VQP_OBJ_REQ_RECONFIRM  0x03
  70 #define VQP_OBJ_RESP_RECONFIRM 0x04
  71
  72 static const struct tok vqp_msg_type_values[] = {
  73     { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"},
  74     { VQP_OBJ_RESP_VLAN, "Response, VLAN"},
  75     { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"},
  76     { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"},
  77     { 0, NULL}
  78 };
  79
  80 static const struct tok vqp_error_code_values[] = {
  81     { 0x00, "No error"},
  82     { 0x03, "Access denied"},
  83     { 0x04, "Shutdown port"},
  84     { 0x05, "Wrong VTP domain"},
  85     { 0, NULL}
  86 };
  87
  88 /* FIXME the heading 0x0c looks ugly - those must be flags etc. */
  89 #define VQP_OBJ_IP_ADDRESS    0x0c01
  90 #define VQP_OBJ_PORT_NAME     0x0c02
  91 #define VQP_OBJ_VLAN_NAME     0x0c03
  92 #define VQP_OBJ_VTP_DOMAIN    0x0c04
  93 #define VQP_OBJ_ETHERNET_PKT  0x0c05
  94 #define VQP_OBJ_MAC_NULL      0x0c06
  95 #define VQP_OBJ_MAC_ADDRESS   0x0c08
  96
  97 static const struct tok vqp_obj_values[] = {
  98     { VQP_OBJ_IP_ADDRESS, "Client IP Address" },
  99     { VQP_OBJ_PORT_NAME, "Port Name" },
 100     { VQP_OBJ_VLAN_NAME, "VLAN Name" },
 101     { VQP_OBJ_VTP_DOMAIN, "VTP Domain" },
 102     { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" },
 103     { VQP_OBJ_MAC_NULL, "MAC Null" },
 104     { VQP_OBJ_MAC_ADDRESS, "MAC Address" },
 105     { 0, NULL}
 106 };
 107
 108 void
 109 vqp_print(register const u_char *pptr, register u_int len)
 110 {
 111     const struct vqp_common_header_t *vqp_common_header;
 112     const struct vqp_obj_tlv_t *vqp_obj_tlv;
 113
 114     const u_char *tptr;
 115     u_int16_t vqp_obj_len;
 116     u_int32_t vqp_obj_type;
 117     int tlen;
 118     u_int8_t nitems;
 119
 120     tptr=pptr;
 121     tlen = len;
 122     vqp_common_header = (const struct vqp_common_header_t *)pptr;
 123     TCHECK(*vqp_common_header);
 124
 125     /*
 126      * Sanity checking of the header.
 127      */
 128     if (VQP_EXTRACT_VERSION(vqp_common_header->version) != VQP_VERSION) {
 129         printf("VQP version %u packet not supported",
 130                VQP_EXTRACT_VERSION(vqp_common_header->version));
 131         return;
 132     }
 133
 134     /* in non-verbose mode just lets print the basic Message Type */
 135     if (vflag < 1) {
 136         printf("VQPv%u %s Message, error-code %s (%u), length %u",
 137                VQP_EXTRACT_VERSION(vqp_common_header->version),
 138                tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type),
 139                tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code),
 140                vqp_common_header->error_code,
 141                len);
 142         return;
 143     }
 144
 145     /* ok they seem to want to know everything - lets fully decode it */
 146     nitems = vqp_common_header->nitems;
 147     printf("\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u",
 148            VQP_EXTRACT_VERSION(vqp_common_header->version),
 149            tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type),
 150            tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code),
 151            vqp_common_header->error_code,
 152            EXTRACT_32BITS(&vqp_common_header->sequence),
 153            nitems,
 154            len);
 155
 156     /* skip VQP Common header */
 157     tptr+=sizeof(const struct vqp_common_header_t);
 158     tlen-=sizeof(const struct vqp_common_header_t);
 159
 160     while (nitems > 0 && tlen > 0) {
 161
 162         vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr;
 163         vqp_obj_type = EXTRACT_32BITS(vqp_obj_tlv->obj_type);
 164         vqp_obj_len = EXTRACT_16BITS(vqp_obj_tlv->obj_length);
 165         tptr+=sizeof(struct vqp_obj_tlv_t);
 166         tlen-=sizeof(struct vqp_obj_tlv_t);
 167
 168         printf("\n\t  %s Object (0x%08x), length %u, value: ",
 169                tok2str(vqp_obj_values, "Unknown", vqp_obj_type),
 170                vqp_obj_type, vqp_obj_len);
 171
 172         /* basic sanity check */
 173         if (vqp_obj_type == 0 || vqp_obj_len ==0) {
 174             return;
 175         }
 176
 177         /* did we capture enough for fully decoding the object ? */
 178         if (!TTEST2(*tptr, vqp_obj_len))
 179             goto trunc;
 180
 181         switch(vqp_obj_type) {
 182         case VQP_OBJ_IP_ADDRESS:
 183             printf("%s (0x%08x)", ipaddr_string(tptr), EXTRACT_32BITS(tptr));
 184             break;
 185             /* those objects have similar semantics - fall through */
 186         case VQP_OBJ_PORT_NAME:
 187         case VQP_OBJ_VLAN_NAME:
 188         case VQP_OBJ_VTP_DOMAIN:
 189         case VQP_OBJ_ETHERNET_PKT:
 190             safeputs((const char *)tptr, vqp_obj_len);
 191             break;
 192             /* those objects have similar semantics - fall through */
 193         case VQP_OBJ_MAC_ADDRESS:
 194         case VQP_OBJ_MAC_NULL:
 195               printf("%s", etheraddr_string(tptr));
 196               break;
 197         default:
 198             if (vflag <= 1)
 199                 print_unknown_data(tptr, "\n\t    ", vqp_obj_len);
 200             break;
 201         }
 202         tptr += vqp_obj_len;
 203         tlen -= vqp_obj_len;
 204         nitems--;
 205     }
 206     return;
 207 trunc:
 208     printf("\n\t[|VQP]");
 209 }