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

1 files changed, 1179 insertions, 0 deletions

diff --git a/epan/dissectors/packet-dhcp-failover.c b/epan/dissectors/packet-dhcp-failover.c
new file mode 100644
index 0000000000..d90bc141a4
--- /dev/null
+++ b/epan/dissectors/packet-dhcp-failover.c
@@ -0,0 +1,1179 @@
+/* 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);
+ */
+}
+