text: /*
   * Copyright (c) 1998-2006 The TCPDUMP project
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that: (1) source code
   * distributions retain the above copyright notice and this paragraph
   * in its entirety, and (2) distributions including binary code include
   * the above copyright notice and this paragraph in its entirety in
   * the documentation or other materials provided with the distribution.
   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
   * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
   * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   * FOR A PARTICULAR PURPOSE.
   *
   * Original code by Carles Kishimoto <Carles.Kishimoto@bsc.es>
   */
  
  /* \summary: Cisco VLAN Query Protocol (VQP) printer */
  
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #include <netdissect-stdinc.h>
  
  #include "netdissect.h"
  #include "extract.h"
  #include "addrtoname.h"
  
  #define VQP_VERSION            		1
  #define VQP_EXTRACT_VERSION(x) ((x)&0xFF)
  
  /*
   * VQP common header
   *
   *  0                   1                   2                   3
   *  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
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * |   Constant    | Packet type   |  Error Code   |    nitems     |
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   * |                Packet Sequence Number (4 bytes)               |
   * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   */
  
  struct vqp_common_header_t {
      uint8_t version;
      uint8_t msg_type;
      uint8_t error_code;
      uint8_t nitems;
      uint8_t sequence[4];
  };
  
  struct vqp_obj_tlv_t {
      uint8_t obj_type[4];
      uint8_t obj_length[2];
  };
  
  #define VQP_OBJ_REQ_JOIN_PORT  0x01
  #define VQP_OBJ_RESP_VLAN      0x02
  #define VQP_OBJ_REQ_RECONFIRM  0x03
  #define VQP_OBJ_RESP_RECONFIRM 0x04
  
  static const struct tok vqp_msg_type_values[] = {
      { VQP_OBJ_REQ_JOIN_PORT, "Request, Join Port"},
      { VQP_OBJ_RESP_VLAN, "Response, VLAN"},
      { VQP_OBJ_REQ_RECONFIRM, "Request, Reconfirm"},
      { VQP_OBJ_RESP_RECONFIRM, "Response, Reconfirm"},
      { 0, NULL}
  };
  
  static const struct tok vqp_error_code_values[] = {
      { 0x00, "No error"},
      { 0x03, "Access denied"},
      { 0x04, "Shutdown port"},
      { 0x05, "Wrong VTP domain"},
      { 0, NULL}
  };
  
  /* FIXME the heading 0x0c looks ugly - those must be flags etc. */
  #define VQP_OBJ_IP_ADDRESS    0x0c01
  #define VQP_OBJ_PORT_NAME     0x0c02
  #define VQP_OBJ_VLAN_NAME     0x0c03
  #define VQP_OBJ_VTP_DOMAIN    0x0c04
  #define VQP_OBJ_ETHERNET_PKT  0x0c05
  #define VQP_OBJ_MAC_NULL      0x0c06
  #define VQP_OBJ_MAC_ADDRESS   0x0c08
  
  static const struct tok vqp_obj_values[] = {
      { VQP_OBJ_IP_ADDRESS, "Client IP Address" },
      { VQP_OBJ_PORT_NAME, "Port Name" },
      { VQP_OBJ_VLAN_NAME, "VLAN Name" },
      { VQP_OBJ_VTP_DOMAIN, "VTP Domain" },
      { VQP_OBJ_ETHERNET_PKT, "Ethernet Packet" },
      { VQP_OBJ_MAC_NULL, "MAC Null" },
      { VQP_OBJ_MAC_ADDRESS, "MAC Address" },
      { 0, NULL}
  };
  
  void
  vqp_print(netdissect_options *ndo, register const u_char *pptr, register u_int len)
  {
      const struct vqp_common_header_t *vqp_common_header;
      const struct vqp_obj_tlv_t *vqp_obj_tlv;
  
      const u_char *tptr;
      uint16_t vqp_obj_len;
      uint32_t vqp_obj_type;
      int tlen;
      uint8_t nitems;
  
      tptr=pptr;
      tlen = len;
      vqp_common_header = (const struct vqp_common_header_t *)pptr;
      ND_TCHECK(*vqp_common_header);
  
      /*
       * Sanity checking of the header.
       */
      if (VQP_EXTRACT_VERSION(vqp_common_header->version) != VQP_VERSION) {
  	ND_PRINT((ndo, "VQP version %u packet not supported",
                 VQP_EXTRACT_VERSION(vqp_common_header->version)));
  	return;
      }
  
      /* in non-verbose mode just lets print the basic Message Type */
      if (ndo->ndo_vflag < 1) {
          ND_PRINT((ndo, "VQPv%u %s Message, error-code %s (%u), length %u",
                 VQP_EXTRACT_VERSION(vqp_common_header->version),
                 tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type),
                 tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code),
  	       vqp_common_header->error_code,
                 len));
          return;
      }
  
      /* ok they seem to want to know everything - lets fully decode it */
      nitems = vqp_common_header->nitems;
      ND_PRINT((ndo, "\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u",
             VQP_EXTRACT_VERSION(vqp_common_header->version),
  	   tok2str(vqp_msg_type_values, "unknown (%u)",vqp_common_header->msg_type),
  	   tok2str(vqp_error_code_values, "unknown (%u)",vqp_common_header->error_code),
  	   vqp_common_header->error_code,
             EXTRACT_32BITS(&vqp_common_header->sequence),
             nitems,
             len));
  
      /* skip VQP Common header */
      tptr+=sizeof(const struct vqp_common_header_t);
      tlen-=sizeof(const struct vqp_common_header_t);
  
      while (nitems > 0 && tlen > 0) {
  
          vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr;
          vqp_obj_type = EXTRACT_32BITS(vqp_obj_tlv->obj_type);
          vqp_obj_len = EXTRACT_16BITS(vqp_obj_tlv->obj_length);
          tptr+=sizeof(struct vqp_obj_tlv_t);
          tlen-=sizeof(struct vqp_obj_tlv_t);
  
          ND_PRINT((ndo, "\n\t  %s Object (0x%08x), length %u, value: ",
                 tok2str(vqp_obj_values, "Unknown", vqp_obj_type),
                 vqp_obj_type, vqp_obj_len));
  
          /* basic sanity check */
          if (vqp_obj_type == 0 || vqp_obj_len ==0) {
              return;
          }
  
          /* did we capture enough for fully decoding the object ? */
          ND_TCHECK2(*tptr, vqp_obj_len);
  
          switch(vqp_obj_type) {
  	case VQP_OBJ_IP_ADDRESS:
              ND_PRINT((ndo, "%s (0x%08x)", ipaddr_string(ndo, tptr), EXTRACT_32BITS(tptr)));
              break;
              /* those objects have similar semantics - fall through */
          case VQP_OBJ_PORT_NAME:
  	case VQP_OBJ_VLAN_NAME:
  	case VQP_OBJ_VTP_DOMAIN:
  	case VQP_OBJ_ETHERNET_PKT:
              safeputs(ndo, tptr, vqp_obj_len);
              break;
              /* those objects have similar semantics - fall through */
  	case VQP_OBJ_MAC_ADDRESS:
  	case VQP_OBJ_MAC_NULL:
  	      ND_PRINT((ndo, "%s", etheraddr_string(ndo, tptr)));
                break;
          default:
              if (ndo->ndo_vflag <= 1)
                  print_unknown_data(ndo,tptr, "\n\t    ", vqp_obj_len);
              break;
          }
  	tptr += vqp_obj_len;
  	tlen -= vqp_obj_len;
  	nitems--;
      }
      return;
  trunc:
      ND_PRINT((ndo, "\n\t[|VQP]"));
  }
  