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 #define NETDISSECT_REWORKED
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <tcpdump-stdinc.h>
  26
  27 #include "interface.h"
  28 #include "extract.h"
  29 #include "addrtoname.h"
  30
  31 #define VQP_VERSION                     1
  32 #define VQP_EXTRACT_VERSION(x) ((x)&0xFF)
  33
  34 /*
  35  * VQP common header
  36  *
  37  *  0                   1                   2                   3
  38  *  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
  39  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  40  * |   Constant    | Packet type   |  Error Code   |    nitems     |
  41  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  42  * |                Packet Sequence Number (4 bytes)               |
  43  * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  44  */
  45
  46 struct vqp_common_header_t {
  47     u_int8_t version;
  48     u_int8_t msg_type;
  49     u_int8_t error_code;
  50     u_int8_t nitems;
  51     u_int8_t sequence[4];
  52 };
  53
  54 struct vqp_obj_tlv_t {
  55     u_int8_t obj_type[4];
  56     u_int8_t obj_length[2];
  57 };
  58
  59 #define VQP_OBJ_REQ_JOIN_PORT  0x01
  60 #define VQP_OBJ_RESP_VLAN      0x02
  61 #define VQP_OBJ_REQ_RECONFIRM  0x03
  62 #define VQP_OBJ_RESP_RECONFIRM 0x04
  63
  64 static const struct tok vqp_msg_type_values[] = {
  65     { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"},
  66     { VQP_OBJ_RESP_VLAN, "Response, VLAN"},
  67     { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"},
  68     { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"},
  69     { 0, NULL}
  70 };
  71
  72 static const struct tok vqp_error_code_values[] = {
  73     { 0x00, "No error"},
  74     { 0x03, "Access denied"},
  75     { 0x04, "Shutdown port"},
  76     { 0x05, "Wrong VTP domain"},
  77     { 0, NULL}
  78 };
  79
  80 /* FIXME the heading 0x0c looks ugly - those must be flags etc. */
  81 #define VQP_OBJ_IP_ADDRESS    0x0c01
  82 #define VQP_OBJ_PORT_NAME     0x0c02
  83 #define VQP_OBJ_VLAN_NAME     0x0c03
  84 #define VQP_OBJ_VTP_DOMAIN    0x0c04
  85 #define VQP_OBJ_ETHERNET_PKT  0x0c05
  86 #define VQP_OBJ_MAC_NULL      0x0c06
  87 #define VQP_OBJ_MAC_ADDRESS   0x0c08
  88
  89 static const struct tok vqp_obj_values[] = {
  90     { VQP_OBJ_IP_ADDRESS, "Client IP Address" },
  91     { VQP_OBJ_PORT_NAME, "Port Name" },
  92     { VQP_OBJ_VLAN_NAME, "VLAN Name" },
  93     { VQP_OBJ_VTP_DOMAIN, "VTP Domain" },
  94     { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" },
  95     { VQP_OBJ_MAC_NULL, "MAC Null" },
  96     { VQP_OBJ_MAC_ADDRESS, "MAC Address" },
  97     { 0, NULL}
  98 };
  99
 100 void
 101 vqp_print(netdissect_options *ndo, register const u_char *pptr, register u_int len)
 102 {
 103     const struct vqp_common_header_t *vqp_common_header;
 104     const struct vqp_obj_tlv_t *vqp_obj_tlv;
 105
 106     const u_char *tptr;
 107     u_int16_t vqp_obj_len;
 108     u_int32_t vqp_obj_type;
 109     int tlen;
 110     u_int8_t nitems;
 111
 112     tptr=pptr;
 113     tlen = len;
 114     vqp_common_header = (const struct vqp_common_header_t *)pptr;
 115     ND_TCHECK(*vqp_common_header);
 116
 117     /*
 118      * Sanity checking of the header.
 119      */
 120     if (VQP_EXTRACT_VERSION(vqp_common_header->version) != VQP_VERSION) {
 121         ND_PRINT((ndo, "VQP version %u packet not supported",
 122                VQP_EXTRACT_VERSION(vqp_common_header->version)));
 123         return;
 124     }
 125
 126     /* in non-verbose mode just lets print the basic Message Type */
 127     if (ndo->ndo_vflag < 1) {
 128         ND_PRINT((ndo, "VQPv%u %s Message, error-code %s (%u), length %u",
 129                VQP_EXTRACT_VERSION(vqp_common_header->version),
 130                tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type),
 131                tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code),
 132                vqp_common_header->error_code,
 133                len));
 134         return;
 135     }
 136
 137     /* ok they seem to want to know everything - lets fully decode it */
 138     nitems = vqp_common_header->nitems;
 139     ND_PRINT((ndo, "\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u",
 140            VQP_EXTRACT_VERSION(vqp_common_header->version),
 141            tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type),
 142            tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code),
 143            vqp_common_header->error_code,
 144            EXTRACT_32BITS(&vqp_common_header->sequence),
 145            nitems,
 146            len));
 147
 148     /* skip VQP Common header */
 149     tptr+=sizeof(const struct vqp_common_header_t);
 150     tlen-=sizeof(const struct vqp_common_header_t);
 151
 152     while (nitems > 0 && tlen > 0) {
 153
 154         vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr;
 155         vqp_obj_type = EXTRACT_32BITS(vqp_obj_tlv->obj_type);
 156         vqp_obj_len = EXTRACT_16BITS(vqp_obj_tlv->obj_length);
 157         tptr+=sizeof(struct vqp_obj_tlv_t);
 158         tlen-=sizeof(struct vqp_obj_tlv_t);
 159
 160         ND_PRINT((ndo, "\n\t  %s Object (0x%08x), length %u, value: ",
 161                tok2str(vqp_obj_values, "Unknown", vqp_obj_type),
 162                vqp_obj_type, vqp_obj_len));
 163
 164         /* basic sanity check */
 165         if (vqp_obj_type == 0 || vqp_obj_len ==0) {
 166             return;
 167         }
 168
 169         /* did we capture enough for fully decoding the object ? */
 170         if (!ND_TTEST2(*tptr, vqp_obj_len))
 171             goto trunc;
 172
 173         switch(vqp_obj_type) {
 174         case VQP_OBJ_IP_ADDRESS:
 175             ND_PRINT((ndo, "%s (0x%08x)", ipaddr_string(tptr), EXTRACT_32BITS(tptr)));
 176             break;
 177             /* those objects have similar semantics - fall through */
 178         case VQP_OBJ_PORT_NAME:
 179         case VQP_OBJ_VLAN_NAME:
 180         case VQP_OBJ_VTP_DOMAIN:
 181         case VQP_OBJ_ETHERNET_PKT:
 182             safeputs(ndo, tptr, vqp_obj_len);
 183             break;
 184             /* those objects have similar semantics - fall through */
 185         case VQP_OBJ_MAC_ADDRESS:
 186         case VQP_OBJ_MAC_NULL:
 187               ND_PRINT((ndo, "%s", etheraddr_string(tptr)));
 188               break;
 189         default:
 190             if (ndo->ndo_vflag <= 1)
 191                 print_unknown_data(ndo,tptr, "\n\t    ", vqp_obj_len);
 192             break;
 193         }
 194         tptr += vqp_obj_len;
 195         tlen -= vqp_obj_len;
 196         nitems--;
 197     }
 198     return;
 199 trunc:
 200     ND_PRINT((ndo, "\n\t[|VQP]"));
 201 }