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