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wireshark/epan/dissectors/packet-dhcp-failover.c

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M. Ortega y Strupp <moys@loplof.de> ISC DHCP Server 3.0 failover protocol dissection Note: I tried to make the port configurable via prefs but failed to do so: It always cashed on startup so it is commented out for now. svn path=/trunk/; revision=11630
2004-08-09 01:53:26 +00:00
/* packet-dhcpfo.c
* Routines for ISC DHCP Server failover protocol dissection
* Copyright 2004, M. Ortega y Strupp <moys@loplof.de>
*
* $Id$
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* This implementation is loosely based on draft-ietf-dhc-failover-07.txt.
* As this document does not represent the actual implementation, the
* source code of ISC DHCPD 3.0 was used too.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <prefs.h>
#include "packet-arp.h"
#define TCP_PORT_DHCPFO 519
static unsigned int tcp_port_pref = TCP_PORT_DHCPFO;
static dissector_handle_t dhcpfo_handle;
/* Initialize the protocol and registered fields */
static int proto_dhcpfo = -1;
static int hf_dhcpfo_length = -1;
static int hf_dhcpfo_type = -1;
static int hf_dhcpfo_poffset = -1;
static int hf_dhcpfo_time = -1;
static int hf_dhcpfo_xid = -1;
static int hf_dhcpfo_additional_HB = -1;
static int hf_dhcpfo_payload_data = -1;
static int hf_dhcpfo_option_code = -1;
static int hf_dhcpfo_dhcp_style_option = -1;
static int hf_dhcpfo_option_length = -1;
static int hf_dhcpfo_binding_status = -1;
static int hf_dhcpfo_server_state = -1;
static int hf_dhcpfo_assigned_ip_address = -1;
static int hf_dhcpfo_sending_server_ip_address = -1;
static int hf_dhcpfo_addresses_transfered = -1;
static int hf_dhcpfo_client_identifier = -1;
static int hf_dhcpfo_client_hw_type = -1;
static int hf_dhcpfo_client_hardware_address = -1;
static int hf_dhcpfo_ftddns = -1;
static int hf_dhcpfo_reject_reason = -1;
static int hf_dhcpfo_message = -1;
static int hf_dhcpfo_mclt = -1;
static int hf_dhcpfo_vendor_class = -1;
static int hf_dhcpfo_lease_expiration_time = -1;
static int hf_dhcpfo_grace_expiration_time = -1;
static int hf_dhcpfo_potential_expiration_time = -1;
static int hf_dhcpfo_client_last_transaction_time = -1;
static int hf_dhcpfo_start_time_of_state = -1;
static int hf_dhcpfo_vendor_option = -1;
static int hf_dhcpfo_max_unacked_bndupd = -1;
static int hf_dhcpfo_protocol_version = -1;
static int hf_dhcpfo_receive_timer = -1;
static int hf_dhcpfo_message_digest = -1;
static int hf_dhcpfo_hash_bucket_assignment = -1;
/* Initialize the subtree pointers */
static gint ett_dhcpfo = -1;
static gint ett_fo_payload = -1;
static gint ett_fo_option = -1;
/* structure for payload data */
struct payloadMessage {
struct payloadMessage *next;
int opcode;
int length;
/*guint data;*/
int actualpoffset;
};
struct payloadMessage *liste;
/* message-types of failover */
enum {
DHCP_FO_RESERVED,
DHCP_FO_POOLREQ,
DHCP_FO_POOLRESP,
DHCP_FO_BNDUPD,
DHCP_FO_BNDACK,
DHCP_FO_CONNECT,
DHCP_FO_CONNECTACK,
DHCP_FO_UPDREQ,
DHCP_FO_UPDDONE,
DHCP_FO_UPDREQALL,
DHCP_FO_STATE,
DHCP_FO_CONTACT,
DHCP_FO_DISCONNECT
};
static const value_string failover_vals[] =
{
{DHCP_FO_RESERVED, "Reserved"},
{DHCP_FO_POOLREQ, "Pool request"},
{DHCP_FO_POOLRESP, "Pool response"},
{DHCP_FO_BNDUPD, "Binding update"},
{DHCP_FO_BNDACK, "Binding acknowledge"},
{DHCP_FO_CONNECT, "Connect"},
{DHCP_FO_CONNECTACK, "Connect acknowledge"},
{DHCP_FO_UPDREQ, "Update request all"},
{DHCP_FO_UPDDONE, "Update done"},
{DHCP_FO_UPDREQALL, "Update request"},
{DHCP_FO_STATE, "State"},
{DHCP_FO_CONTACT, "Contact"},
{DHCP_FO_DISCONNECT, "Disconnect"},
{0, NULL}
};
/*options of payload-data*/
enum {
DHCP_FO_PD_UNKNOWN_PACKET0,
DHCP_FO_PD_BINDING_STATUS,
DHCP_FO_PD_ASSIGNED_IP_ADDRESS,
DHCP_FO_PD_SENDING_SERVER_IP_ADDRESS,
DHCP_FO_PD_ADDRESSES_TRANSFERED,
DHCP_FO_PD_CLIENT_IDENTIFIER,
DHCP_FO_PD_CLIENT_HARDWARE_ADDRESS,
DHCP_FO_PD_FTDDNS,
DHCP_FO_PD_REJECT_REASON,
DHCP_FO_PD_MESSAGE,
DHCP_FO_PD_MCLT,
DHCP_FO_PD_VENDOR_CLASS,
DHCP_FO_PD_UNKNOWN_PACKET12,
DHCP_FO_PD_LEASE_EXPIRATION_TIME,
DHCP_FO_PD_POTENTIAL_EXPIRATION_TIME,
DHCP_FO_PD_GRACE_EXPIRATION_TIME,
DHCP_FO_PD_CLIENT_LAST_TRANSACTION_TIME,
DHCP_FO_PD_START_TIME_OF_STATE,
DHCP_FO_PD_SERVERSTATE,
DHCP_FO_PD_SERVERFLAG,
DHCP_FO_PD_VENDOR_OPTION,
DHCP_FO_PD_MAX_UNACKED_BNDUPD,
DHCP_FO_PD_UNKNOWN_PACKET22,
DHCP_FO_PD_RECEIVE_TIMER,
DHCP_FO_PD_HASH_BUCKET_ASSIGNMENT,
DHCP_FO_PD_MESSAGE_DIGEST,
DHCP_FO_PD_PROTOCOL_VERSION,
DHCP_FO_PD_TLS_REQUEST,
DHCP_FO_PD_TLS_REPLY,
DHCP_FO_PD_REQUEST_OPTION,
DHCP_FO_PD_REPLY_OPTION
};
static const value_string option_code_vals[] =
{
{DHCP_FO_PD_UNKNOWN_PACKET0, "Unknown Packet"},
{DHCP_FO_PD_BINDING_STATUS, "binding-status"},
{DHCP_FO_PD_ASSIGNED_IP_ADDRESS, "assigned-IP-address"},
{DHCP_FO_PD_SENDING_SERVER_IP_ADDRESS, "sending-server-IP-address"},
{DHCP_FO_PD_ADDRESSES_TRANSFERED, "addresses-transfered"},
{DHCP_FO_PD_CLIENT_IDENTIFIER, "client-identifier"},
{DHCP_FO_PD_CLIENT_HARDWARE_ADDRESS, "client-hardware-address"},
{DHCP_FO_PD_FTDDNS, "FTDDNS"},
{DHCP_FO_PD_REJECT_REASON, "reject-reason"},
{DHCP_FO_PD_MESSAGE, "message"},
{DHCP_FO_PD_MCLT, "MCLT"},
{DHCP_FO_PD_VENDOR_CLASS, "vendor-class"},
{DHCP_FO_PD_UNKNOWN_PACKET12, "Unknown Packet"},
{DHCP_FO_PD_LEASE_EXPIRATION_TIME, "lease-expiration-time"},
{DHCP_FO_PD_POTENTIAL_EXPIRATION_TIME, "potential-expiration-time"},
{DHCP_FO_PD_GRACE_EXPIRATION_TIME, "grace-expiration-time"},
{DHCP_FO_PD_CLIENT_LAST_TRANSACTION_TIME, "client-last-transaction-time"},
{DHCP_FO_PD_START_TIME_OF_STATE, "start-time-of-state"},
{DHCP_FO_PD_SERVERSTATE, "server-state"},
{DHCP_FO_PD_SERVERFLAG, "server-flag"},
{DHCP_FO_PD_VENDOR_OPTION, "vendor-option"},
{DHCP_FO_PD_MAX_UNACKED_BNDUPD, "max-unacked-BNDUPD"},
{DHCP_FO_PD_UNKNOWN_PACKET22, "Unknown Packet"},
{DHCP_FO_PD_RECEIVE_TIMER, "receive-timer"},
{DHCP_FO_PD_HASH_BUCKET_ASSIGNMENT, "hash-bucket-assignment"},
{DHCP_FO_PD_MESSAGE_DIGEST, "message-digest"},
{DHCP_FO_PD_PROTOCOL_VERSION, "protocol-version"},
{DHCP_FO_PD_TLS_REQUEST, "TLS-request"},
{DHCP_FO_PD_TLS_REPLY, "TLS-reply"},
{DHCP_FO_PD_REQUEST_OPTION, "request-option"},
{DHCP_FO_PD_REPLY_OPTION, "reply-option"},
{0, NULL}
};
/* Binding-status */
enum {
DHCP_FO_BS_UNKNOWN_PACKET,
DHCP_FO_BS_FREE,
DHCP_FO_BS_ACTIVE,
DHCP_FO_BS_EXPIRED,
DHCP_FO_BS_RELEASED,
DHCP_FO_BS_ABANDONED,
DHCP_FO_BS_RESET,
DHCP_FO_BS_BACKUP
};
static const value_string binding_status_vals[] =
{
{DHCP_FO_BS_UNKNOWN_PACKET, "Unknown Packet"},
{DHCP_FO_BS_FREE, "FREE"},
{DHCP_FO_BS_ACTIVE, "ACTIVE"},
{DHCP_FO_BS_EXPIRED, "EXPIRED"},
{DHCP_FO_BS_RELEASED, "RELEASED"},
{DHCP_FO_BS_ABANDONED, "ABANDONED"},
{DHCP_FO_BS_RESET, "RESET"},
{DHCP_FO_BS_BACKUP, "BACKUP"},
{0, NULL}
};
/* Server-status */
enum {
DHCP_FO_SS_UNKNOWN_PACKET,
DHCP_FO_SS_PARTNER_DOWN,
DHCP_FO_SS_NORMAL,
DHCP_FO_SS_COMMUNICATION_INTERRUPTED,
DHCP_FO_SS_RESOLUTION_INTERRUPTED,
DHCP_FO_SS_POTENTIAL_CONFLICT,
DHCP_FO_SS_RECOVER,
DHCP_FO_SS_RECOVER_DONE,
DHCP_FO_SS_SHUTDOWN,
DHCP_FO_SS_PAUSED,
DHCP_FO_SS_STARTUP,
DHCP_FO_SS_RECOVER_WAIT
};
static const value_string server_state_vals[] =
{
{DHCP_FO_SS_UNKNOWN_PACKET, "Unknown Packet"},
{DHCP_FO_SS_PARTNER_DOWN, "partner down"},
{DHCP_FO_SS_NORMAL, "normal"},
{DHCP_FO_SS_COMMUNICATION_INTERRUPTED, "communication interrupted"},
{DHCP_FO_SS_RESOLUTION_INTERRUPTED, "resolution interrupted"},
{DHCP_FO_SS_POTENTIAL_CONFLICT, "potential conflict"},
{DHCP_FO_SS_RECOVER, "recover"},
{DHCP_FO_SS_RECOVER_DONE, "recover done"},
{DHCP_FO_SS_SHUTDOWN, "shutdown"},
{DHCP_FO_SS_PAUSED, "paused"},
{DHCP_FO_SS_STARTUP, "startup"},
{DHCP_FO_SS_RECOVER_WAIT, "recover wait"},
{0, NULL}
};
/* reject reasons */
enum {
DHCP_FO_RR_0,
DHCP_FO_RR_1,
DHCP_FO_RR_2,
DHCP_FO_RR_3,
DHCP_FO_RR_4,
DHCP_FO_RR_5,
DHCP_FO_RR_6,
DHCP_FO_RR_7,
DHCP_FO_RR_8,
DHCP_FO_RR_9,
DHCP_FO_RR_10,
DHCP_FO_RR_11,
DHCP_FO_RR_12,
DHCP_FO_RR_13,
DHCP_FO_RR_14,
DHCP_FO_RR_15,
DHCP_FO_RR_16,
DHCP_FO_RR_17,
DHCP_FO_RR_18,
DHCP_FO_RR_19,
DHCP_FO_RR_254 = 254
};
static const value_string reject_reason_vals[] =
{
{DHCP_FO_RR_0, "Reserved"},
{DHCP_FO_RR_1, "Illegal IP address (not part of any address pool)"},
{DHCP_FO_RR_2, "Fatal conflict exists: address in use by other client"},
{DHCP_FO_RR_3, "Missing binding information"},
{DHCP_FO_RR_4, "Connection rejected, time mismatch too great"},
{DHCP_FO_RR_5, "Connection rejected, invalid MCLT"},
{DHCP_FO_RR_6, "Connection rejected, unknown reason"},
{DHCP_FO_RR_7, "Connection rejected, duplicate connection"},
{DHCP_FO_RR_8, "Connection rejected, invalid failover partner"},
{DHCP_FO_RR_9, "TLS not supported"},
{DHCP_FO_RR_10, "TLS supported but not configured"},
{DHCP_FO_RR_11, "TLS required but not supported by partner"},
{DHCP_FO_RR_12, "Message digest not supported"},
{DHCP_FO_RR_13, "Message digest not configured"},
{DHCP_FO_RR_14, "Protocol version mismatch"},
{DHCP_FO_RR_15, "Missing binding information"},
{DHCP_FO_RR_16, "Outdated binding information"},
{DHCP_FO_RR_17, "Less critical binding information"},
{DHCP_FO_RR_18, "No traffic within sufficient time"},
{DHCP_FO_RR_19, "Hash bucket assignment conflict"},
{DHCP_FO_RR_254, "Unknown: Error occurred but does not match any reason"},
{0, NULL}
};
/* Code to actually dissect the packets */
static void
dissect_dhcpfo(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti, *pi, *oi, *receive_timer_item;
proto_tree *dhcpfo_tree, *payload_tree, *option_tree;
guint16 length, tls_request;
guint type, serverflag;
guint poffset;
guint32 xid;
gchar *typestrval, *optionstrval, *tls_request_string;
guint32 time, lease_expiration_time, grace_expiration_time;
guint32 potential_expiration_time, client_last_transaction_time;
guint32 start_time_of_state;
enum DHCPFOBoolean { false, true } additionalHB, more_payload;
guint additionalHBlength;
struct payloadMessage *helpliste;
int actualoffset;
guint8 htype, reject_reason, message_digest_type;
const guint8 *chaddr;
guint8 binding_status;
gchar *binding_status_str, *reject_reason_str;
gchar *assigned_ip_address_str, *sending_server_ip_address_str;
guint32 addresses_transfered;
const guint8 *client_identifier_str, *vendor_class_str;
gchar *htype_str, *chaddr_str;
gchar *lease_expiration_time_str;
gchar *grace_expiration_time_str, *potential_expiration_time_str;
gchar *client_last_transaction_time_str, *start_time_of_state_str;
gchar *server_state_str;
guint32 mclt;
guint8 server_state, protocol_version;
guint32 max_unacked_bndupd, receive_timer;
/* Make entries in Protocol column and Info column on summary display */
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DHCP Failover");
length = tvb_get_ntohs(tvb, 0);
type = tvb_get_guint8(tvb, 2);
typestrval= match_strval(type,failover_vals);
if (typestrval==NULL) {
typestrval="Unknown Packet";
}
poffset = tvb_get_guint8(tvb, 3);
if(poffset > 12)
{
additionalHB = true;
additionalHBlength = poffset-12;
}
else
{
additionalHB = false;
additionalHBlength = 0;
}
xid = tvb_get_ntohl(tvb, 8);
if (check_col(pinfo->cinfo, COL_INFO)){
col_add_fstr(pinfo->cinfo,
COL_INFO,"%s xid: %x", typestrval,xid);
}
actualoffset = poffset;
liste = NULL;
/* payload-data */
if(length-poffset != 0)
{
more_payload = true;
/*liste->next = NULL;*/
liste = (struct payloadMessage*)g_malloc(sizeof(struct payloadMessage));
helpliste = liste;
actualoffset = poffset;
while(more_payload == true)
{
helpliste->opcode = tvb_get_ntohs(tvb, actualoffset);
helpliste->length = tvb_get_ntohs(tvb, actualoffset+2);
helpliste->next = NULL;
helpliste->actualpoffset = actualoffset;
actualoffset = actualoffset + helpliste->length + 4;
if(actualoffset>=length)
{
more_payload = false;
}
else
{
helpliste->next = (struct payloadMessage*)g_malloc(sizeof(struct payloadMessage));
}
helpliste = helpliste->next;
}
}
if (tree) {
/* create display subtree for the protocol */
ti = proto_tree_add_item(tree, proto_dhcpfo, tvb, 0, -1, FALSE);
dhcpfo_tree = proto_item_add_subtree(ti, ett_dhcpfo);
proto_tree_add_item(dhcpfo_tree,
hf_dhcpfo_length, tvb, 0, 2, FALSE);
proto_tree_add_item(dhcpfo_tree,
hf_dhcpfo_type, tvb, 2, 1, FALSE);
proto_tree_add_item(dhcpfo_tree,
hf_dhcpfo_poffset, tvb, 3, 1, FALSE);
time = tvb_get_ntohl(tvb, 4);
proto_tree_add_uint_format(dhcpfo_tree, hf_dhcpfo_time, tvb, 4, 4,time,"%s", abs_time_secs_to_str(time));
proto_tree_add_item(dhcpfo_tree,
hf_dhcpfo_xid, tvb, 8, 4, FALSE);
/* if there are any additional header bytes */
if(additionalHB==true)
{
proto_tree_add_item(dhcpfo_tree,
hf_dhcpfo_additional_HB, tvb, 12, additionalHBlength, FALSE);
}
if(length-poffset != 0)
{
/* create display subtree for the protocol */
pi = proto_tree_add_item(dhcpfo_tree, hf_dhcpfo_payload_data, tvb, poffset, length-poffset, FALSE);
payload_tree = proto_item_add_subtree(pi, ett_fo_payload);
helpliste = liste;
while(helpliste!=NULL)
{
oi = proto_tree_add_item(payload_tree, hf_dhcpfo_dhcp_style_option, tvb, helpliste->actualpoffset, helpliste->length+4, FALSE);
option_tree = proto_item_add_subtree(oi, ett_fo_option);
/*** DHCP-Style-Options ****/
optionstrval= match_strval(helpliste->opcode,option_code_vals);
if (optionstrval==NULL) {
optionstrval="Unknown Packet";
}
proto_item_append_text(oi, ", %s (%d)",
optionstrval, helpliste->opcode);
proto_tree_add_item(option_tree,
hf_dhcpfo_option_code, tvb,
helpliste->actualpoffset, 2, FALSE);
proto_tree_add_item(option_tree,
hf_dhcpfo_option_length, tvb,
helpliste->actualpoffset+2, 2, FALSE);
/** opcode dependent format **/
switch(helpliste->opcode){
case DHCP_FO_PD_BINDING_STATUS:
binding_status = tvb_get_guint8(tvb,
helpliste->actualpoffset+4);
binding_status_str =
match_strval(binding_status,
binding_status_vals);
if(binding_status_str == NULL)
{
binding_status_str = "Unknown Packet";
}
proto_item_append_text(oi, ", %s (%d)",
binding_status_str,
binding_status);
proto_tree_add_item(option_tree,
hf_dhcpfo_binding_status, tvb,
helpliste->actualpoffset + 4, 1, FALSE);
break;
case DHCP_FO_PD_ASSIGNED_IP_ADDRESS:
assigned_ip_address_str = ip_to_str(
tvb_get_ptr(tvb,
helpliste->actualpoffset+4,
helpliste->length));
proto_item_append_text(oi, ", %s ",
assigned_ip_address_str);
proto_tree_add_item(option_tree,
hf_dhcpfo_assigned_ip_address, tvb,
helpliste->actualpoffset + 4,
helpliste->length , FALSE);
break;
case DHCP_FO_PD_SENDING_SERVER_IP_ADDRESS:
sending_server_ip_address_str = ip_to_str(tvb_get_ptr(tvb,helpliste->actualpoffset+4,helpliste->length));
proto_item_append_text(oi, ", %s ",
sending_server_ip_address_str);
proto_tree_add_item(option_tree,
hf_dhcpfo_sending_server_ip_address, tvb,
helpliste->actualpoffset + 4,
helpliste->length , FALSE);
break;
case DHCP_FO_PD_ADDRESSES_TRANSFERED:
addresses_transfered = tvb_get_ntohl(tvb,
helpliste->actualpoffset+4);
proto_item_append_text(oi,", %d",addresses_transfered);
proto_tree_add_item(option_tree,
hf_dhcpfo_addresses_transfered, tvb,
helpliste->actualpoffset + 4,
helpliste->length , FALSE);
break;
case DHCP_FO_PD_CLIENT_IDENTIFIER:
client_identifier_str = tvb_get_ptr(tvb,
helpliste->actualpoffset+4,
helpliste->length);
proto_item_append_text(oi,", \"%s\"",client_identifier_str);
proto_tree_add_item(option_tree,
hf_dhcpfo_client_identifier, tvb,
helpliste->actualpoffset + 4,
helpliste->length , FALSE);
break;
case DHCP_FO_PD_CLIENT_HARDWARE_ADDRESS:
htype = tvb_get_guint8(tvb,helpliste->actualpoffset+4);
chaddr = tvb_get_ptr(tvb, helpliste->actualpoffset+5,
helpliste->length-1);
htype_str = arphrdtype_to_str(htype, "Unknown (0x%02x)");
chaddr_str = arphrdaddr_to_str(tvb_get_ptr(tvb,
helpliste->actualpoffset+5, 6),6,htype);
proto_item_append_text(oi, ", %s, %s",
htype_str, chaddr_str);
proto_tree_add_text(option_tree, tvb,
helpliste->actualpoffset+4, 1,
"Hardware type: %s",
htype_str);
proto_tree_add_text(option_tree, tvb,
helpliste->actualpoffset+5, 6,
"Client hardware address: %s",
chaddr_str);
break;
case DHCP_FO_PD_FTDDNS:
proto_tree_add_item(option_tree,
hf_dhcpfo_ftddns, tvb,
helpliste->actualpoffset + 4,
helpliste->length , FALSE);
break;
case DHCP_FO_PD_REJECT_REASON:
reject_reason = tvb_get_guint8(tvb,
helpliste->actualpoffset +4);
reject_reason_str = match_strval(reject_reason,
reject_reason_vals);
if (reject_reason_str==NULL) {
reject_reason_str="Unknown Packet";
}
proto_item_append_text(oi, ", %s (%d)",
reject_reason_str,
reject_reason);
proto_tree_add_item(option_tree,
hf_dhcpfo_reject_reason, tvb,
helpliste->actualpoffset +4,
helpliste->length, FALSE);
break;
case DHCP_FO_PD_MESSAGE:
proto_tree_add_item(option_tree,
hf_dhcpfo_message, tvb,
helpliste->actualpoffset + 4,
helpliste->length , FALSE);
break;
case DHCP_FO_PD_MCLT:
mclt = tvb_get_ntohl(tvb, helpliste->actualpoffset+4);
proto_item_append_text(oi,", %d seconds",mclt);
proto_tree_add_item(option_tree,
hf_dhcpfo_mclt, tvb,
helpliste->actualpoffset +4,
helpliste->length, FALSE);
break;
case DHCP_FO_PD_VENDOR_CLASS:
vendor_class_str = tvb_get_ptr(tvb,
helpliste->actualpoffset+4,helpliste->length);
proto_item_append_text(oi,", \"%s\"",vendor_class_str);
proto_tree_add_item(option_tree,
hf_dhcpfo_vendor_class, tvb,
helpliste->actualpoffset +4,
helpliste->length, FALSE);
break;
case DHCP_FO_PD_LEASE_EXPIRATION_TIME:
lease_expiration_time = tvb_get_ntohl(tvb,
helpliste->actualpoffset+4);
lease_expiration_time_str =
abs_time_secs_to_str(lease_expiration_time);
proto_item_append_text(oi, ", %s",
lease_expiration_time_str);
proto_tree_add_uint_format(option_tree,
hf_dhcpfo_lease_expiration_time, tvb,
helpliste->actualpoffset +4,
helpliste->length,
lease_expiration_time,
"Lease expiration time: %s",
lease_expiration_time_str);
break;
case DHCP_FO_PD_POTENTIAL_EXPIRATION_TIME:
potential_expiration_time = tvb_get_ntohl(tvb,
helpliste->actualpoffset+4);
potential_expiration_time_str =
abs_time_secs_to_str(potential_expiration_time);
proto_item_append_text(oi, ", %s",
potential_expiration_time_str);
proto_tree_add_uint_format(option_tree,
hf_dhcpfo_potential_expiration_time, tvb,
helpliste->actualpoffset +4,
helpliste->length,
potential_expiration_time,
"Potential expiration time: %s",
potential_expiration_time_str);
break;
case DHCP_FO_PD_GRACE_EXPIRATION_TIME:
grace_expiration_time = tvb_get_ntohl(tvb,
helpliste->actualpoffset+4);
grace_expiration_time_str =
abs_time_secs_to_str(grace_expiration_time);
proto_item_append_text(oi, ", %s",
grace_expiration_time_str);
proto_tree_add_uint_format(option_tree,
hf_dhcpfo_grace_expiration_time, tvb,
helpliste->actualpoffset +4,
helpliste->length,
grace_expiration_time,
"Grace expiration time: %s",
grace_expiration_time_str);
break;
case DHCP_FO_PD_CLIENT_LAST_TRANSACTION_TIME:
client_last_transaction_time = tvb_get_ntohl(tvb,
helpliste->actualpoffset+4);
client_last_transaction_time_str =
abs_time_secs_to_str(client_last_transaction_time);
proto_item_append_text(oi, ", %s",
client_last_transaction_time_str);
proto_tree_add_uint_format(option_tree,
hf_dhcpfo_client_last_transaction_time, tvb,
helpliste->actualpoffset +4,
helpliste->length,
client_last_transaction_time,
"Last transaction time: %s", abs_time_secs_to_str(client_last_transaction_time));
break;
case DHCP_FO_PD_START_TIME_OF_STATE:
start_time_of_state = tvb_get_ntohl(tvb,
helpliste->actualpoffset+4);
start_time_of_state_str =
abs_time_secs_to_str(start_time_of_state);
proto_item_append_text(oi, ", %s",
start_time_of_state_str);
proto_tree_add_uint_format(option_tree,
hf_dhcpfo_start_time_of_state, tvb,
helpliste->actualpoffset +4,
helpliste->length,
start_time_of_state,
"Start time of state: %s", abs_time_secs_to_str(start_time_of_state));
break;
case DHCP_FO_PD_SERVERSTATE:
server_state = tvb_get_guint8(tvb, helpliste->actualpoffset+4);
server_state_str = match_strval(server_state,server_state_vals);
if (server_state_str==NULL) {
server_state_str="Unknown Packet";
}
proto_item_append_text(oi, ", %s (%d)",
server_state_str, server_state);
proto_tree_add_item(option_tree,
hf_dhcpfo_server_state, tvb,
helpliste->actualpoffset + 4, 1, FALSE);
break;
case DHCP_FO_PD_SERVERFLAG:
serverflag = tvb_get_guint8(tvb,
helpliste->actualpoffset+4);
if(serverflag == 1)
{
proto_item_append_text(oi, ", STARTUP (1)");
proto_tree_add_text(option_tree,tvb,
helpliste->actualpoffset +4,
helpliste->length,
"Serverflag: STARTUP");
}
else if(serverflag == 0)
{
proto_item_append_text(oi, ", NONE (%d)",
serverflag);
proto_tree_add_text(option_tree,tvb,
helpliste->actualpoffset +4,
helpliste->length,
"Serverflag: NONE");
}
else
{
proto_item_append_text(oi,
"UNKNOWN FLAGS (%d)", serverflag);
proto_tree_add_text(option_tree,tvb,
helpliste->actualpoffset +4,
helpliste->length,
"Serverflag: UNKNOWN FLAGS");
}
break;
case DHCP_FO_PD_VENDOR_OPTION:
proto_tree_add_item(option_tree,
hf_dhcpfo_vendor_option, tvb,
helpliste->actualpoffset + 4,
helpliste->length , FALSE);
break;
case DHCP_FO_PD_MAX_UNACKED_BNDUPD:
max_unacked_bndupd =
tvb_get_ntohl(tvb,helpliste->actualpoffset+4);
proto_item_append_text(oi,", %d", max_unacked_bndupd);
printf("länge: %d", helpliste->length);
proto_tree_add_item(option_tree,
hf_dhcpfo_max_unacked_bndupd, tvb,
helpliste->actualpoffset + 4,
helpliste->length , FALSE);
break;
case DHCP_FO_PD_RECEIVE_TIMER:
receive_timer =
tvb_get_ntohl(tvb,helpliste->actualpoffset+4);
proto_item_append_text(oi,", %d seconds", receive_timer);
receive_timer_item = proto_tree_add_item(option_tree,
hf_dhcpfo_receive_timer, tvb,
helpliste->actualpoffset + 4,
helpliste->length , FALSE);
proto_item_append_text(receive_timer_item, " seconds");
break;
case DHCP_FO_PD_HASH_BUCKET_ASSIGNMENT:
proto_tree_add_item(option_tree,
hf_dhcpfo_hash_bucket_assignment, tvb,
helpliste->actualpoffset +4,
helpliste->length, FALSE);
break;
case DHCP_FO_PD_MESSAGE_DIGEST:
message_digest_type = tvb_get_ntohs(tvb,helpliste->actualpoffset+4);
if(message_digest_type == 1)
{
proto_item_append_text(oi, ", HMAC-MD5");
proto_tree_add_text(option_tree, tvb, helpliste->actualpoffset+4, 1, "Message digest type: HMAC-MD5");
}
else
{
proto_item_append_text(oi, ", type not allowed");
proto_tree_add_text(option_tree, tvb, helpliste->actualpoffset+4, 1, "Message digest type: not allowed");
}
proto_tree_add_item(option_tree,
hf_dhcpfo_message_digest, tvb,
helpliste->actualpoffset+5,
helpliste->length-1,FALSE);
break;
case DHCP_FO_PD_PROTOCOL_VERSION:
protocol_version =
tvb_get_guint8(tvb, helpliste->actualpoffset+4);
proto_item_append_text(oi, ", version: %d",
protocol_version);
proto_tree_add_item(option_tree,
hf_dhcpfo_protocol_version, tvb,
helpliste->actualpoffset + 4,
helpliste->length , FALSE);
break;
case DHCP_FO_PD_TLS_REQUEST:
tls_request = tvb_get_ntohs(tvb,helpliste->actualpoffset+4);
if(tls_request == 0)
{
tls_request_string = "No TLS operation";
}
else if(tls_request == 1)
{
tls_request_string = "TLS operation desired but not required";
}
else if(tls_request == 2)
{
tls_request_string = "TLS operation is required";
}
else
{
tls_request_string = "Unknown value";
}
proto_item_append_text(oi, ", %s", tls_request_string);
proto_tree_add_text(option_tree, tvb,
helpliste->actualpoffset+4,
helpliste->length,
"TLS request: %s", tls_request_string);
break;
case DHCP_FO_PD_TLS_REPLY:
break;
case DHCP_FO_PD_REQUEST_OPTION:
break;
case DHCP_FO_PD_REPLY_OPTION:
break;
default:
break;
}
helpliste=helpliste->next;
}
}
}
free(liste);
}
void
proto_reg_handoff_dhcpfo(void)
{
/*
* FIXME: I tried to make the port configurable but it just dumps core [JMayer]
* static int initialized = FALSE;
* static int port = 0;
*
* if (initialized) {
* dissector_delete("tcp.port", port, dhcpfo_handle);
* } else {
* initialized = TRUE;
* }
* port = tcp_port_pref;
*/
dissector_add("tcp.port", tcp_port_pref, dhcpfo_handle);
}
/* Register the protocol with Ethereal */
void
proto_register_dhcpfo(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_dhcpfo_length,
{ "Message length", "dhcpfo.length",
FT_UINT16, BASE_DEC, NULL, 0,
"", HFILL }
},
{ &hf_dhcpfo_type,
{ "Message Type", "dhcpfo.type",
FT_UINT8, BASE_DEC, VALS(failover_vals), 0,
"", HFILL }
},
{ &hf_dhcpfo_poffset,
{ "Payload Offset", "dhcpfo.poffset",
FT_UINT8, BASE_DEC, NULL, 0,
"", HFILL }
},
{ &hf_dhcpfo_time,
{ "Time", "dhcpfo.time",
FT_UINT32, BASE_DEC, NULL, 0,
"", HFILL }
},
{ &hf_dhcpfo_xid,
{ "Xid", "dhcpfo.xid",
FT_UINT32, BASE_HEX, NULL, 0,
"", HFILL }
},
{ &hf_dhcpfo_additional_HB,
{"Additional Header Bytes", "dhcpfo.additionalheaderbytes",
FT_BYTES, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{ &hf_dhcpfo_payload_data,
{"Payload Data", "dhcpfo.payloaddata",
FT_NONE, BASE_NONE, NULL, 0,
"", HFILL }
},
{ &hf_dhcpfo_dhcp_style_option,
{"DHCP Style Option", "dhcpfo.dhcpstyleoption",
FT_NONE, BASE_NONE, NULL, 0,
"", HFILL }
},
{ &hf_dhcpfo_option_code,
{"Option Code", "dhcpfo.optioncode",
FT_UINT16, BASE_DEC, VALS(option_code_vals), 0,
"", HFILL }
},
{&hf_dhcpfo_option_length,
{"Length", "dhcpfo.optionlength",
FT_UINT16, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_binding_status,
{"Type", "dhcpfo.bindingstatus",
FT_UINT32, BASE_DEC, VALS(binding_status_vals), 0,
"", HFILL }
},
{&hf_dhcpfo_server_state,
{"server status", "dhcpfo.serverstatus",
FT_UINT8, BASE_DEC, VALS(server_state_vals), 0,
"", HFILL }
},
{&hf_dhcpfo_assigned_ip_address,
{"assigned ip address", "dhcpfo.assignedipaddress",
FT_IPv4, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{&hf_dhcpfo_sending_server_ip_address,
{"sending server ip-address", "dhcpfo.sendingserveripaddress",
FT_IPv4, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{&hf_dhcpfo_addresses_transfered,
{"addresses transfered", "dhcpfo.addressestransfered",
FT_UINT8, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_client_identifier,
{"Client Identifier", "dhcpfo.clientidentifier",
FT_STRING, BASE_NONE, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_client_hw_type,
{"Client Hardware Type", "dhcpfo.clienthardwaretype",
FT_UINT8, BASE_HEX, NULL, 0x0,
"", HFILL }},
{&hf_dhcpfo_client_hardware_address,
{"Client Hardware Address", "dhcpfo.clienthardwareaddress",
FT_BYTES, BASE_NONE, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_ftddns,
{"FTDDNS", "dhcpfo.ftddns",
FT_STRING, BASE_NONE, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_reject_reason,
{"Reject reason", "dhcpfo.rejectreason",
FT_UINT8, BASE_DEC, VALS(reject_reason_vals), 0,
"", HFILL }
},
{&hf_dhcpfo_message,
{"Message", "dhcpfo.message",
FT_STRING, BASE_NONE, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_mclt,
{"MCLT", "dhcpfo.mclt",
FT_UINT32, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_vendor_class,
{"Vendor class", "dhcpfo.vendorclass",
FT_STRING, BASE_NONE, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_lease_expiration_time,
{"Lease expiration time", "dhcpfo.leaseexpirationtime",
FT_UINT32, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_grace_expiration_time,
{"Grace expiration time", "dhcpfo.graceexpirationtime",
FT_UINT32, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_potential_expiration_time,
{"Potential expiration time", "dhcpfo.potentialexpirationtime",
FT_UINT32, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_client_last_transaction_time,
{"Client last transaction time", "dhcpfo.clientlasttransactiontime",
FT_UINT32, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_start_time_of_state,
{"Start time of state", "dhcpfo.starttimeofstate",
FT_UINT32, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_vendor_option,
{"Vendor option", "dhcpfo.vendoroption",
FT_NONE, BASE_NONE, NULL, 0x0,
"", HFILL }
},
{&hf_dhcpfo_max_unacked_bndupd,
{"Max unacked BNDUPD", "dhcpfo.maxunackedbndupd",
FT_UINT8, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_protocol_version,
{"Protocol version", "dhcpfo.protocolversion",
FT_UINT8, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_receive_timer,
{"Receive timer", "dhcpfo.receivetimer",
FT_UINT8, BASE_DEC, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_message_digest,
{"Message digest", "dhcpfo.messagedigest",
FT_STRING, BASE_NONE, NULL, 0,
"", HFILL }
},
{&hf_dhcpfo_hash_bucket_assignment,
{"Hash bucket assignment", "dhcpfo.hashbucketassignment",
FT_BYTES, BASE_HEX, NULL, 0,
"", HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_dhcpfo,
&ett_fo_payload,
&ett_fo_option,
};
module_t *dhcpfo_module;
/* Register the protocol name and description */
proto_dhcpfo = proto_register_protocol("DHCP FAILOVER",
"DHCP_Failover", "DHCPFAILOVER");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_dhcpfo, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
dhcpfo_handle = create_dissector_handle(dissect_dhcpfo, proto_dhcpfo);
/*
* FIXME: I tried to make the port configurable but it just dumps core [JMayer]
* dhcpfo_module = prefs_register_protocol(proto_dhcpfo, proto_reg_handoff_dhcpfo);
* prefs_register_uint_preference(dhcpfo_module, "tcp.port",
* "DHCPFO TCP Port", "Set the port for DHCP failover communications if other than default of TCP_PORT_DHCPFO",
* 10, &tcp_port_pref);
*/
}