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tcpdump/print-vqp.c

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/*
* 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"
#define ND_LONGJMP_FROM_TCHECK
#include "netdissect.h"
#include "extract.h"
#include "addrtoname.h"
#define VQP_VERSION 1
/*
* 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 {
nd_uint8_t version;
nd_uint8_t msg_type;
nd_uint8_t error_code;
nd_uint8_t nitems;
nd_uint32_t sequence;
};
struct vqp_obj_tlv_t {
nd_uint32_t obj_type;
nd_uint16_t obj_length;
};
#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, const u_char *pptr, 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;
uint8_t version;
uint16_t vqp_obj_len;
uint32_t vqp_obj_type;
u_int tlen;
uint8_t nitems;
ndo->ndo_protocol = "vqp";
tptr=pptr;
tlen = len;
vqp_common_header = (const struct vqp_common_header_t *)pptr;
ND_TCHECK_SIZE(vqp_common_header);
if (sizeof(struct vqp_common_header_t) > tlen)
goto invalid;
version = GET_U_1(vqp_common_header->version);
/*
* Sanity checking of the header.
*/
if (version != VQP_VERSION) {
ND_PRINT("VQP version %u packet not supported",
version);
return;
}
/* in non-verbose mode just lets print the basic Message Type */
if (ndo->ndo_vflag < 1) {
ND_PRINT("VQPv%u %s Message, error-code %s (%u), length %u",
version,
tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)),
tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)),
GET_U_1(vqp_common_header->error_code),
len);
return;
}
/* ok they seem to want to know everything - lets fully decode it */
nitems = GET_U_1(vqp_common_header->nitems);
ND_PRINT("\n\tVQPv%u, %s Message, error-code %s (%u), seq 0x%08x, items %u, length %u",
version,
tok2str(vqp_msg_type_values, "unknown (%u)",GET_U_1(vqp_common_header->msg_type)),
tok2str(vqp_error_code_values, "unknown", GET_U_1(vqp_common_header->error_code)),
GET_U_1(vqp_common_header->error_code),
GET_BE_U_4(vqp_common_header->sequence),
nitems,
len);
/* skip VQP Common header */
tptr+=sizeof(struct vqp_common_header_t);
tlen-=sizeof(struct vqp_common_header_t);
while (nitems != 0 && tlen != 0) {
vqp_obj_tlv = (const struct vqp_obj_tlv_t *)tptr;
ND_TCHECK_SIZE(vqp_obj_tlv);
if (sizeof(struct vqp_obj_tlv_t) > tlen)
goto invalid;
vqp_obj_type = GET_BE_U_4(vqp_obj_tlv->obj_type);
vqp_obj_len = GET_BE_U_2(vqp_obj_tlv->obj_length);
tptr+=sizeof(struct vqp_obj_tlv_t);
tlen-=sizeof(struct vqp_obj_tlv_t);
ND_PRINT("\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_TCHECK_LEN(tptr, vqp_obj_len);
if (vqp_obj_len > tlen)
goto invalid;
switch(vqp_obj_type) {
case VQP_OBJ_IP_ADDRESS:
if (vqp_obj_len != 4)
goto invalid;
ND_PRINT("%s (0x%08x)", GET_IPADDR_STRING(tptr),
GET_BE_U_4(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:
nd_printjnp(ndo, tptr, vqp_obj_len);
break;
/* those objects have similar semantics - fall through */
case VQP_OBJ_MAC_ADDRESS:
case VQP_OBJ_MAC_NULL:
if (vqp_obj_len != MAC_ADDR_LEN)
goto invalid;
ND_PRINT("%s", GET_ETHERADDR_STRING(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;
invalid:
nd_print_invalid(ndo);
}
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