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