1141 lines
33 KiB
C
1141 lines
33 KiB
C
/* packet-dhcpfo.c
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* Routines for ISC DHCP Server failover protocol dissection
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* Copyright 2004, M. Ortega y Strupp <moys@loplof.de>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/*
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* This implementation is loosely based on draft-ietf-dhc-failover-07.txt.
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* As this document does not represent the actual implementation, the
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* source code of ISC DHCPD 3.0 was used too.
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*
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* See also
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*
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* https://tools.ietf.org/html/draft-ietf-dhc-failover-10
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*
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* upon which the handling of the message-digest option is based.
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*
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* Updated to https://tools.ietf.org/html/draft-ietf-dhc-failover-12, July 2020
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/strutil.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include <epan/to_str.h>
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#include "packet-arp.h"
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#include "packet-tcp.h"
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#define TCP_PORT_DHCPFO 647 /* Not IANA registered */
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void proto_register_dhcpfo(void);
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void proto_reg_handoff_dhcpfo(void);
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/* desegmentation of DHCP failover over TCP */
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static gboolean dhcpfo_desegment = TRUE;
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/* Initialize the protocol and registered fields */
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static int proto_dhcpfo = -1;
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static int hf_dhcpfo_length = -1;
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static int hf_dhcpfo_type = -1;
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static int hf_dhcpfo_poffset = -1;
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static int hf_dhcpfo_time = -1;
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static int hf_dhcpfo_xid = -1;
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static int hf_dhcpfo_additional_HB = -1;
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static int hf_dhcpfo_payload_data = -1;
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static int hf_dhcpfo_option_code = -1;
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static int hf_dhcpfo_dhcp_style_option = -1;
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static int hf_dhcpfo_option_length = -1;
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static int hf_dhcpfo_binding_status = -1;
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static int hf_dhcpfo_server_state = -1;
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static int hf_dhcpfo_assigned_ip_address = -1;
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static int hf_dhcpfo_delayed_service_parameter = -1;
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static int hf_dhcpfo_addresses_transferred = -1;
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static int hf_dhcpfo_client_identifier = -1;
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static int hf_dhcpfo_client_hw_type = -1;
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static int hf_dhcpfo_client_hardware_address = -1;
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static int hf_dhcpfo_ftddns = -1;
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static int hf_dhcpfo_reject_reason = -1;
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static int hf_dhcpfo_relationship_name = -1;
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static int hf_dhcpfo_message = -1;
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static int hf_dhcpfo_mclt = -1;
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static int hf_dhcpfo_vendor_class = -1;
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static int hf_dhcpfo_lease_expiration_time = -1;
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static int hf_dhcpfo_potential_expiration_time = -1;
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static int hf_dhcpfo_client_last_transaction_time = -1;
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static int hf_dhcpfo_start_time_of_state = -1;
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static int hf_dhcpfo_vendor_option = -1;
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static int hf_dhcpfo_max_unacked_bndupd = -1;
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static int hf_dhcpfo_protocol_version = -1;
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static int hf_dhcpfo_receive_timer = -1;
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static int hf_dhcpfo_message_digest = -1;
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static int hf_dhcpfo_ipflags = -1;
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static int hf_dhcpfo_ipflags_reserved = -1;
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static int hf_dhcpfo_ipflags_bootp = -1;
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static int hf_dhcpfo_ipflags_mbz = -1;
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static int hf_dhcpfo_hash_bucket_assignment = -1;
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static int hf_dhcpfo_message_digest_type = -1;
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static int hf_dhcpfo_tls_request = -1;
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static int hf_dhcpfo_tls_reply = -1;
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static int hf_dhcpfo_serverflag = -1;
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static int hf_dhcpfo_options = -1;
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/* Initialize the subtree pointers */
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static gint ett_dhcpfo = -1;
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static gint ett_fo_payload = -1;
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static gint ett_fo_option = -1;
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static gint ett_fo_payload_data = -1;
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static expert_field ei_dhcpfo_bad_length = EI_INIT;
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static expert_field ei_dhcpfo_message_digest_type_not_allowed = EI_INIT;
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/* Length of fixed-length portion of header */
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#define DHCPFO_FL_HDR_LEN 12
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/* message-types of failover */
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static const value_string failover_vals[] =
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{
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{1, "Pool request"},
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{2, "Pool response"},
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{3, "Binding update"},
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{4, "Binding acknowledge"},
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{5, "Connect"},
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{6, "Connect acknowledge"},
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{7, "Update request"},
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{8, "Update done"},
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{9, "Update request all"},
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{10, "State"},
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{11, "Contact"},
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{12, "Disconnect"},
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{0, NULL}
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};
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/*options of payload-data*/
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#define DHCP_FO_PD_ADDRESSES_TRANSFERRED 1
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#define DHCP_FO_PD_ASSIGNED_IP_ADDRESS 2
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#define DHCP_FO_PD_BINDING_STATUS 3
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#define DHCP_FO_PD_CLIENT_IDENTIFIER 4
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#define DHCP_FO_PD_CLIENT_HARDWARE_ADDRESS 5
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#define DHCP_FO_PD_CLIENT_LAST_TRANSACTION_TIME 6
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#define DHCP_FO_PD_REPLY_OPTION 7
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#define DHCP_FO_PD_REQUEST_OPTION 8
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#define DHCP_FO_PD_FTDDNS 9
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#define DHCP_FO_PD_DELAYED_SERVICE_PARAMETER 10
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#define DHCP_FO_PD_HASH_BUCKET_ASSIGNMENT 11
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#define DHCP_FO_PD_IP_FLAGS 12
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#define DHCP_FO_PD_LEASE_EXPIRATION_TIME 13
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#define DHCP_FO_PD_MAX_UNACKED_BNDUPD 14
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#define DHCP_FO_PD_MCLT 15
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#define DHCP_FO_PD_MESSAGE 16
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#define DHCP_FO_PD_MESSAGE_DIGEST 17
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#define DHCP_FO_PD_POTENTIAL_EXPIRATION_TIME 18
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#define DHCP_FO_PD_RECEIVE_TIMER 19
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#define DHCP_FO_PD_PROTOCOL_VERSION 20
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#define DHCP_FO_PD_REJECT_REASON 21
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#define DHCP_FO_PD_RELATIONSHIP_NAME 22
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#define DHCP_FO_PD_SERVERFLAG 23
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#define DHCP_FO_PD_SERVERSTATE 24
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#define DHCP_FO_PD_START_TIME_OF_STATE 25
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#define DHCP_FO_PD_TLS_REPLY 26
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#define DHCP_FO_PD_TLS_REQUEST 27
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#define DHCP_FO_PD_VENDOR_CLASS 28
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#define DHCP_FO_PD_VENDOR_OPTION 29
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static const value_string option_code_vals[] =
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{
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{DHCP_FO_PD_ADDRESSES_TRANSFERRED, "addresses-transferred"},
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{DHCP_FO_PD_ASSIGNED_IP_ADDRESS, "assigned-IP-address"},
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{DHCP_FO_PD_BINDING_STATUS, "binding-status"},
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{DHCP_FO_PD_CLIENT_IDENTIFIER, "client-identifier"},
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{DHCP_FO_PD_CLIENT_HARDWARE_ADDRESS, "client-hardware-address"},
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{DHCP_FO_PD_CLIENT_LAST_TRANSACTION_TIME, "client-last-transaction-time"},
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{DHCP_FO_PD_REPLY_OPTION, "reply-option"},
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{DHCP_FO_PD_REQUEST_OPTION, "request-option"},
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{DHCP_FO_PD_FTDDNS, "FTDDNS"},
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{DHCP_FO_PD_DELAYED_SERVICE_PARAMETER, "delayed-service-parameter"},
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{DHCP_FO_PD_HASH_BUCKET_ASSIGNMENT, "hash-bucket-assignment"},
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{DHCP_FO_PD_IP_FLAGS, "IP-flags"},
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{DHCP_FO_PD_LEASE_EXPIRATION_TIME, "lease-expiration-time"},
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{DHCP_FO_PD_MAX_UNACKED_BNDUPD, "max-unacked-BNDUPD"},
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{DHCP_FO_PD_MCLT, "MCLT"},
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{DHCP_FO_PD_MESSAGE, "message"},
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{DHCP_FO_PD_MESSAGE_DIGEST, "message-digest"},
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{DHCP_FO_PD_POTENTIAL_EXPIRATION_TIME, "potential-expiration-time"},
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{DHCP_FO_PD_RECEIVE_TIMER, "receive-timer"},
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{DHCP_FO_PD_PROTOCOL_VERSION, "protocol-version"},
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{DHCP_FO_PD_REJECT_REASON, "reject-reason"},
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{DHCP_FO_PD_RELATIONSHIP_NAME, "relationship-name"},
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{DHCP_FO_PD_SERVERFLAG, "server-flag"},
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{DHCP_FO_PD_SERVERSTATE, "server-state"},
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{DHCP_FO_PD_START_TIME_OF_STATE, "start-time-of-state"},
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{DHCP_FO_PD_TLS_REPLY, "TLS-reply"},
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{DHCP_FO_PD_TLS_REQUEST, "TLS-request"},
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{DHCP_FO_PD_VENDOR_CLASS, "vendor-class"},
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{DHCP_FO_PD_VENDOR_OPTION, "vendor-option"},
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{0, NULL}
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};
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/* Binding-status */
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static const value_string binding_status_vals[] =
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{
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{1, "FREE"},
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{2, "ACTIVE"},
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{3, "EXPIRED"},
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{4, "RELEASED"},
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{5, "ABANDONED"},
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{6, "RESET"},
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{7, "BACKUP"},
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{0, NULL}
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};
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/* Server-status */
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static const value_string server_state_vals[] =
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{
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{1, "startup"},
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{2, "normal"},
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{3, "communication interrupted"},
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{4, "partner down"},
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{5, "potential conflict"},
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{6, "recover"},
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{7, "paused"},
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{8, "shutdown"},
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{9, "recover done"},
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{10, "resolution interrupted"},
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{11, "conflict done"},
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{0, NULL}
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};
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/* reject reasons */
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static const value_string reject_reason_vals[] =
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{
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{0, "Reserved"},
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{1, "Illegal IP address (not part of any address pool)"},
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{2, "Fatal conflict exists: address in use by other client"},
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{3, "Missing binding information"},
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{4, "Connection rejected, time mismatch too great"},
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{5, "Connection rejected, invalid MCLT"},
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{6, "Connection rejected, unknown reason"},
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{7, "Connection rejected, duplicate connection"},
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{8, "Connection rejected, invalid failover partner"},
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{9, "TLS not supported"},
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{10, "TLS supported but not configured"},
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{11, "TLS required but not supported by partner"},
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{12, "Message digest not supported"},
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{13, "Message digest not configured"},
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{14, "Protocol version mismatch"},
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{15, "Outdated binding information"},
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{16, "Less critical binding information"},
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{17, "No traffic within sufficient time"},
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{18, "Hash bucket assignment conflict"},
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{19, "IP not reserved on this server"},
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{20, "Message digest failed to compare"},
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{21, "Missing message digest."},
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{254, "Unknown: Error occurred but does not match any reason"},
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{0, NULL}
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};
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static const value_string tls_request_vals[] =
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{
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{0, "No TLS operation"},
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{1, "TLS operation desired but not required"},
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{2, "TLS operation is required"},
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{0, NULL}
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};
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static const value_string tls_reply_vals[] =
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{
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{0, "No TLS operation"},
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{1, "TLS operation is required"},
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{0, NULL}
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};
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static const value_string message_digest_type_vals[] =
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{
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{1, "HMAC-MD5"},
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{0, NULL}
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};
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static const value_string serverflag_vals[] =
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{
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{0, "NONE"},
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{1, "STARTUP"},
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{0, NULL}
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};
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/* Code to actually dissect the packets */
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static guint
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get_dhcpfo_pdu_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset, void *data _U_)
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{
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/*
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* Return the length of the DHCP failover packet.
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*/
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return tvb_get_ntohs(tvb, offset);
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}
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static int
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dissect_dhcpfo_pdu(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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int offset = 0;
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proto_item *ti, *pi, *oi;
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proto_tree *dhcpfo_tree = NULL, *payload_tree, *option_tree;
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guint8 tls_request, tls_reply;
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guint16 length;
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guint type, serverflag;
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int poffset;
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guint32 xid;
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nstime_t timex;
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guint32 lease_expiration_time,
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potential_expiration_time, client_last_transaction_time,
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start_time_of_state;
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gboolean bogus_poffset;
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guint16 opcode, option_length;
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guint8 htype, reject_reason, message_digest_type, binding_status;
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const guint8 *vendor_class_str;
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const gchar *htype_str;
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gchar *lease_expiration_time_str, *potential_expiration_time_str,
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*client_last_transaction_time_str, *start_time_of_state_str;
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guint32 mclt;
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guint8 server_state;
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guint32 max_unacked_bndupd, receive_timer;
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/* Make entries in Protocol column and Info column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "DHCPFO");
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col_clear(pinfo->cinfo, COL_INFO);
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length = tvb_get_ntohs(tvb, offset);
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if (tree) {
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/* create display subtree for the protocol */
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ti = proto_tree_add_item(tree, proto_dhcpfo, tvb, 0, -1, ENC_NA);
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dhcpfo_tree = proto_item_add_subtree(ti, ett_dhcpfo);
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if (length >= DHCPFO_FL_HDR_LEN) {
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proto_tree_add_uint(dhcpfo_tree,
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hf_dhcpfo_length, tvb, offset, 2, length);
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} else {
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proto_tree_add_uint_format_value(dhcpfo_tree,
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hf_dhcpfo_length, tvb, offset, 2, length,
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"%u (bogus, must be >= %u)",
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length, DHCPFO_FL_HDR_LEN);
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}
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}
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offset += 2;
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type = tvb_get_guint8(tvb, offset);
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if (tree) {
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proto_tree_add_uint(dhcpfo_tree,
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hf_dhcpfo_type, tvb, offset, 1, type);
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}
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col_set_str(pinfo->cinfo, COL_INFO,
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val_to_str_const(type, failover_vals, "Unknown Packet"));
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offset += 1;
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poffset = tvb_get_guint8(tvb, offset);
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if (poffset < DHCPFO_FL_HDR_LEN) {
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bogus_poffset = TRUE;
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if (tree) {
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proto_tree_add_uint_format_value(dhcpfo_tree,
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hf_dhcpfo_poffset, tvb, offset, 1, poffset,
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"%u (bogus, must be >= %u)",
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poffset, DHCPFO_FL_HDR_LEN);
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}
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} else if (poffset > length) {
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bogus_poffset = TRUE;
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if (tree) {
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proto_tree_add_uint_format_value(dhcpfo_tree,
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hf_dhcpfo_poffset, tvb, offset, 1, poffset,
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"%u (bogus, must be <= length of message)",
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poffset);
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}
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} else {
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bogus_poffset = FALSE;
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if (tree) {
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proto_tree_add_uint(dhcpfo_tree,
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hf_dhcpfo_poffset, tvb, offset, 1, poffset);
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}
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}
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offset += 1;
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if (tree) {
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/*
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* XXX - this is *almost* like a time_t, but it's unsigned.
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* Also, we need a way to keep from displaying nanoseconds,
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* so as not to make it look as if it has higher
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*/
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timex.secs = tvb_get_ntohl(tvb, offset);
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timex.nsecs = 0;
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proto_tree_add_time_format_value(dhcpfo_tree, hf_dhcpfo_time, tvb,
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offset, 4, &timex, "%s",
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abs_time_secs_to_str(pinfo->pool, timex.secs, ABSOLUTE_TIME_LOCAL, TRUE));
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}
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offset += 4;
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xid = tvb_get_ntohl(tvb, offset);
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if (tree) {
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proto_tree_add_item(dhcpfo_tree,
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hf_dhcpfo_xid, tvb, offset, 4, ENC_BIG_ENDIAN);
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}
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col_append_fstr(pinfo->cinfo, COL_INFO," xid: %x", xid);
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offset += 4;
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if (bogus_poffset)
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return offset; /* payload offset was bogus */
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if (!tree)
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return tvb_reported_length(tvb);
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/* if there are any additional header bytes */
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if (poffset != offset) {
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proto_tree_add_item(dhcpfo_tree, hf_dhcpfo_additional_HB, tvb,
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offset, poffset-offset, ENC_NA);
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offset = poffset;
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}
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/* payload-data */
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if (poffset == length)
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return length; /* no payload */
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/* create display subtree for the payload */
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pi = proto_tree_add_item(dhcpfo_tree, hf_dhcpfo_payload_data,
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tvb, poffset, length-poffset, ENC_NA);
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payload_tree = proto_item_add_subtree(pi, ett_fo_payload);
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while (offset < length) {
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opcode = tvb_get_ntohs(tvb, offset);
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option_length = tvb_get_ntohs(tvb, offset+2);
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oi = proto_tree_add_item(payload_tree,
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hf_dhcpfo_dhcp_style_option, tvb, offset,
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option_length+4, ENC_NA);
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option_tree = proto_item_add_subtree(oi, ett_fo_option);
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/*** DHCP-Style-Options ****/
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proto_item_append_text(oi, ", %s (%u)",
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val_to_str_const(opcode, option_code_vals, "Unknown Option"),
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opcode);
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proto_tree_add_uint(option_tree, hf_dhcpfo_option_code, tvb,
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offset, 2, opcode);
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proto_tree_add_uint(option_tree, hf_dhcpfo_option_length, tvb,
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offset+2, 2, option_length);
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offset += 4;
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/** opcode dependent format **/
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switch (opcode) {
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case DHCP_FO_PD_BINDING_STATUS:
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binding_status = tvb_get_guint8(tvb, offset);
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proto_item_append_text(oi, ", %s (%d)",
|
|
val_to_str_const(binding_status,
|
|
binding_status_vals,
|
|
"Unknown Packet"),
|
|
binding_status);
|
|
|
|
proto_tree_add_item(option_tree,
|
|
hf_dhcpfo_binding_status, tvb,
|
|
offset, 1, ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
case DHCP_FO_PD_ASSIGNED_IP_ADDRESS:
|
|
if (option_length != 4) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "assigned ip address is not 4 bytes long");
|
|
break;
|
|
}
|
|
proto_item_append_text(oi, ", %s ", tvb_ip_to_str(pinfo->pool, tvb, offset));
|
|
|
|
proto_tree_add_item(option_tree,
|
|
hf_dhcpfo_assigned_ip_address, tvb, offset,
|
|
option_length, ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
case DHCP_FO_PD_DELAYED_SERVICE_PARAMETER:
|
|
if (option_length != 1) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "delayed service parameter is not 1 bytes long");
|
|
break;
|
|
}
|
|
|
|
proto_item_append_text(oi, ", %d ", tvb_get_guint8(tvb, offset));
|
|
|
|
proto_tree_add_item(option_tree,
|
|
hf_dhcpfo_delayed_service_parameter, tvb,
|
|
offset, option_length, ENC_NA);
|
|
break;
|
|
|
|
case DHCP_FO_PD_ADDRESSES_TRANSFERRED:
|
|
if (option_length != 4) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "addresses transferred is not 4 bytes long");
|
|
break;
|
|
}
|
|
|
|
proto_item_append_text(oi,", %u", tvb_get_ntohl(tvb, offset));
|
|
|
|
proto_tree_add_item(option_tree,
|
|
hf_dhcpfo_addresses_transferred, tvb, offset,
|
|
option_length, ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
case DHCP_FO_PD_CLIENT_IDENTIFIER:
|
|
{
|
|
const guint8* identifier;
|
|
/*
|
|
* XXX - if this is truly like DHCP option 81,
|
|
* we need to dissect it as such.
|
|
*/
|
|
proto_tree_add_item_ret_string(option_tree,
|
|
hf_dhcpfo_client_identifier, tvb, offset,
|
|
option_length, ENC_ASCII|ENC_NA, pinfo->pool, &identifier);
|
|
|
|
proto_item_append_text(oi,", \"%s\"", identifier);
|
|
}
|
|
break;
|
|
|
|
case DHCP_FO_PD_CLIENT_HARDWARE_ADDRESS:
|
|
if (option_length < 2) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "hardware address is too short");
|
|
break;
|
|
}
|
|
htype = tvb_get_guint8(tvb, offset);
|
|
htype_str = tvb_arphrdaddr_to_str(pinfo->pool, tvb, offset+1, option_length-1,
|
|
htype);
|
|
|
|
proto_item_append_text(oi, ", %s, %s", htype_str,
|
|
htype_str);
|
|
|
|
proto_tree_add_item(option_tree, hf_dhcpfo_client_hw_type, tvb,
|
|
offset, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_string(option_tree, hf_dhcpfo_client_hardware_address, tvb,
|
|
offset+1, option_length-1, htype_str);
|
|
break;
|
|
|
|
case DHCP_FO_PD_FTDDNS:
|
|
proto_tree_add_item(option_tree, hf_dhcpfo_ftddns, tvb,
|
|
offset, option_length, ENC_ASCII);
|
|
break;
|
|
|
|
case DHCP_FO_PD_REJECT_REASON:
|
|
if (option_length != 1) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "Reject reason is not 1 byte long");
|
|
break;
|
|
}
|
|
reject_reason = tvb_get_guint8(tvb, offset);
|
|
|
|
proto_item_append_text(oi, ", %s (%d)",
|
|
val_to_str_const(reject_reason, reject_reason_vals,
|
|
"Unknown Packet"),
|
|
reject_reason);
|
|
|
|
proto_tree_add_uint(option_tree,
|
|
hf_dhcpfo_reject_reason, tvb, offset,
|
|
option_length, reject_reason);
|
|
break;
|
|
|
|
case DHCP_FO_PD_RELATIONSHIP_NAME:
|
|
proto_tree_add_item(option_tree, hf_dhcpfo_relationship_name, tvb,
|
|
offset, option_length, ENC_ASCII);
|
|
break;
|
|
|
|
case DHCP_FO_PD_MESSAGE:
|
|
proto_tree_add_item(option_tree, hf_dhcpfo_message, tvb,
|
|
offset, option_length, ENC_ASCII);
|
|
break;
|
|
|
|
case DHCP_FO_PD_MCLT:
|
|
if (option_length != 4) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "MCLT is not 4 bytes long");
|
|
break;
|
|
}
|
|
mclt = tvb_get_ntohl(tvb, offset);
|
|
proto_item_append_text(oi,", %u seconds", mclt);
|
|
proto_tree_add_uint(option_tree, hf_dhcpfo_mclt, tvb,
|
|
offset, option_length, mclt);
|
|
break;
|
|
|
|
case DHCP_FO_PD_VENDOR_CLASS:
|
|
proto_tree_add_item_ret_string(option_tree,
|
|
hf_dhcpfo_vendor_class, tvb, offset,
|
|
option_length, ENC_ASCII, pinfo->pool, &vendor_class_str);
|
|
proto_item_append_text(oi,", \"%s\"",
|
|
format_text(pinfo->pool, vendor_class_str, option_length));
|
|
break;
|
|
|
|
case DHCP_FO_PD_LEASE_EXPIRATION_TIME:
|
|
if (option_length != 4) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "Lease expiration time is not 4 bytes long");
|
|
break;
|
|
}
|
|
lease_expiration_time =
|
|
tvb_get_ntohl(tvb, offset);
|
|
lease_expiration_time_str =
|
|
abs_time_secs_to_str(pinfo->pool, lease_expiration_time, ABSOLUTE_TIME_LOCAL, TRUE);
|
|
|
|
proto_item_append_text(oi, ", %s",
|
|
lease_expiration_time_str);
|
|
|
|
proto_tree_add_uint_format_value(option_tree,
|
|
hf_dhcpfo_lease_expiration_time, tvb,
|
|
offset, option_length,
|
|
lease_expiration_time,
|
|
"%s",
|
|
lease_expiration_time_str);
|
|
break;
|
|
|
|
case DHCP_FO_PD_POTENTIAL_EXPIRATION_TIME:
|
|
if (option_length != 4) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "Potential expiration time is not 4 bytes long");
|
|
break;
|
|
}
|
|
potential_expiration_time =
|
|
tvb_get_ntohl(tvb, offset);
|
|
|
|
potential_expiration_time_str =
|
|
abs_time_secs_to_str(pinfo->pool, potential_expiration_time, ABSOLUTE_TIME_LOCAL, TRUE);
|
|
|
|
proto_item_append_text(oi, ", %s",
|
|
potential_expiration_time_str);
|
|
|
|
proto_tree_add_uint_format_value(option_tree,
|
|
hf_dhcpfo_potential_expiration_time, tvb,
|
|
offset, option_length,
|
|
potential_expiration_time,
|
|
"%s",
|
|
potential_expiration_time_str);
|
|
break;
|
|
|
|
case DHCP_FO_PD_CLIENT_LAST_TRANSACTION_TIME:
|
|
if (option_length != 4) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "Last transaction time is not 4 bytes long");
|
|
break;
|
|
}
|
|
client_last_transaction_time =
|
|
tvb_get_ntohl(tvb, offset);
|
|
client_last_transaction_time_str =
|
|
abs_time_secs_to_str(pinfo->pool, client_last_transaction_time, ABSOLUTE_TIME_LOCAL, TRUE);
|
|
|
|
proto_item_append_text(oi, ", %s",
|
|
client_last_transaction_time_str);
|
|
|
|
proto_tree_add_uint_format_value(option_tree,
|
|
hf_dhcpfo_client_last_transaction_time, tvb,
|
|
offset, option_length,
|
|
client_last_transaction_time,
|
|
"%s",
|
|
abs_time_secs_to_str(pinfo->pool, client_last_transaction_time, ABSOLUTE_TIME_LOCAL, TRUE));
|
|
break;
|
|
|
|
case DHCP_FO_PD_START_TIME_OF_STATE:
|
|
if (option_length != 4) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "Start time of state is not 4 bytes long");
|
|
break;
|
|
}
|
|
start_time_of_state =
|
|
tvb_get_ntohl(tvb, offset);
|
|
start_time_of_state_str =
|
|
abs_time_secs_to_str(pinfo->pool, start_time_of_state, ABSOLUTE_TIME_LOCAL, TRUE);
|
|
|
|
proto_item_append_text(oi, ", %s",
|
|
start_time_of_state_str);
|
|
|
|
proto_tree_add_uint_format_value(option_tree,
|
|
hf_dhcpfo_start_time_of_state, tvb,
|
|
offset, option_length,
|
|
start_time_of_state,
|
|
"%s",
|
|
abs_time_secs_to_str(pinfo->pool, start_time_of_state, ABSOLUTE_TIME_LOCAL, TRUE));
|
|
break;
|
|
|
|
case DHCP_FO_PD_SERVERSTATE:
|
|
if (option_length != 1) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "server status is not 1 byte long");
|
|
break;
|
|
}
|
|
server_state = tvb_get_guint8(tvb, offset);
|
|
|
|
proto_item_append_text(oi, ", %s (%u)",
|
|
val_to_str_const(server_state, server_state_vals,
|
|
"Unknown"),
|
|
server_state);
|
|
|
|
proto_tree_add_uint(option_tree,
|
|
hf_dhcpfo_server_state, tvb, offset, 1,
|
|
server_state);
|
|
break;
|
|
|
|
case DHCP_FO_PD_SERVERFLAG:
|
|
if (option_length != 1) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "Serverflag is not 1 byte long");
|
|
break;
|
|
}
|
|
serverflag = tvb_get_guint8(tvb, offset);
|
|
proto_item_append_text(oi, ", %s (%d)",
|
|
val_to_str_const(serverflag, serverflag_vals, "UNKNOWN FLAGS"),
|
|
serverflag);
|
|
proto_tree_add_item(option_tree, hf_dhcpfo_serverflag, tvb, offset, option_length, ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
case DHCP_FO_PD_VENDOR_OPTION:
|
|
proto_tree_add_item(option_tree,
|
|
hf_dhcpfo_vendor_option, tvb, offset,
|
|
option_length, ENC_NA);
|
|
break;
|
|
|
|
case DHCP_FO_PD_MAX_UNACKED_BNDUPD:
|
|
if (option_length != 4) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "Max unacked BNDUPD is not 4 bytes long");
|
|
break;
|
|
}
|
|
max_unacked_bndupd = tvb_get_ntohl(tvb, offset);
|
|
proto_item_append_text(oi, ", %u", max_unacked_bndupd);
|
|
|
|
proto_tree_add_uint(option_tree,
|
|
hf_dhcpfo_max_unacked_bndupd, tvb, offset,
|
|
option_length, max_unacked_bndupd);
|
|
break;
|
|
|
|
case DHCP_FO_PD_RECEIVE_TIMER:
|
|
if (option_length != 4) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "Receive timer is not 4 bytes long");
|
|
break;
|
|
}
|
|
receive_timer = tvb_get_ntohl(tvb, offset);
|
|
proto_item_append_text(oi,", %u seconds",
|
|
receive_timer);
|
|
|
|
proto_tree_add_uint(option_tree,
|
|
hf_dhcpfo_receive_timer, tvb, offset,
|
|
option_length, receive_timer);
|
|
break;
|
|
|
|
case DHCP_FO_PD_HASH_BUCKET_ASSIGNMENT:
|
|
proto_tree_add_item(option_tree,
|
|
hf_dhcpfo_hash_bucket_assignment, tvb,
|
|
offset, option_length, ENC_NA);
|
|
break;
|
|
|
|
case DHCP_FO_PD_IP_FLAGS: {
|
|
static int * const ipflags[] = {
|
|
&hf_dhcpfo_ipflags_reserved,
|
|
&hf_dhcpfo_ipflags_bootp,
|
|
&hf_dhcpfo_ipflags_mbz,
|
|
NULL
|
|
};
|
|
if (option_length != 2) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "IP flags is not 2 bytes long");
|
|
break;
|
|
}
|
|
proto_tree_add_bitmask(option_tree, tvb, offset, hf_dhcpfo_ipflags,
|
|
ett_fo_payload_data, ipflags, ENC_BIG_ENDIAN);
|
|
break;
|
|
}
|
|
|
|
case DHCP_FO_PD_MESSAGE_DIGEST:
|
|
if (option_length < 2) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "Message digest is too short");
|
|
break;
|
|
}
|
|
|
|
message_digest_type = tvb_get_guint8(tvb, offset);
|
|
ti = proto_tree_add_item(option_tree, hf_dhcpfo_message_digest_type, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
|
|
if (message_digest_type == 1) {
|
|
proto_item_append_text(oi, ", HMAC-MD5");
|
|
} else {
|
|
proto_item_append_text(oi, ", type not allowed");
|
|
expert_add_info_format(pinfo, ti, &ei_dhcpfo_message_digest_type_not_allowed, "Message digest type: %u, not allowed", message_digest_type);
|
|
}
|
|
|
|
proto_tree_add_item(option_tree,
|
|
hf_dhcpfo_message_digest, tvb, offset+1,
|
|
option_length-1, ENC_ASCII);
|
|
break;
|
|
|
|
case DHCP_FO_PD_PROTOCOL_VERSION:
|
|
if (option_length != 1) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "Protocol version is not 1 byte long");
|
|
break;
|
|
}
|
|
proto_item_append_text(oi, ", version: %u", tvb_get_guint8(tvb, offset));
|
|
proto_tree_add_item(option_tree, hf_dhcpfo_protocol_version, tvb, offset, option_length, ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
case DHCP_FO_PD_TLS_REQUEST:
|
|
if (option_length != 1) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "TLS request is not 1 bytes long");
|
|
break;
|
|
}
|
|
tls_request = tvb_get_guint8(tvb, offset);
|
|
proto_item_append_text(oi, ", %s", val_to_str(tls_request, tls_request_vals, "Unknown (%u)"));
|
|
proto_tree_add_item(option_tree, hf_dhcpfo_tls_request, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
case DHCP_FO_PD_TLS_REPLY:
|
|
if (option_length != 1) {
|
|
expert_add_info_format(pinfo, oi, &ei_dhcpfo_bad_length, "TLS reply is not 1 bytes long");
|
|
break;
|
|
}
|
|
tls_reply = tvb_get_guint8(tvb, offset);
|
|
proto_item_append_text(oi, ", %s", val_to_str(tls_reply, tls_reply_vals, "Unknown (%u)"));
|
|
proto_tree_add_item(option_tree, hf_dhcpfo_tls_reply, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
break;
|
|
|
|
case DHCP_FO_PD_REQUEST_OPTION:
|
|
case DHCP_FO_PD_REPLY_OPTION:
|
|
proto_tree_add_item(option_tree, hf_dhcpfo_options, tvb, offset, option_length, ENC_NA);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
offset += option_length;
|
|
}
|
|
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
|
|
static int
|
|
dissect_dhcpfo(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
|
|
{
|
|
tcp_dissect_pdus(tvb, pinfo, tree, dhcpfo_desegment, 2,
|
|
get_dhcpfo_pdu_len, dissect_dhcpfo_pdu, data);
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
|
|
/* Register the protocol with Wireshark */
|
|
|
|
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,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_dhcpfo_type,
|
|
{ "Message Type", "dhcpfo.type",
|
|
FT_UINT8, BASE_DEC, VALS(failover_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_dhcpfo_poffset,
|
|
{ "Payload Offset", "dhcpfo.poffset",
|
|
FT_UINT8, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_dhcpfo_time,
|
|
{ "Time", "dhcpfo.time",
|
|
FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_dhcpfo_xid,
|
|
{ "Xid", "dhcpfo.xid",
|
|
FT_UINT32, BASE_HEX, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_dhcpfo_additional_HB,
|
|
{"Additional Header Bytes", "dhcpfo.additionalheaderbytes",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_dhcpfo_payload_data,
|
|
{"Payload Data", "dhcpfo.payloaddata",
|
|
FT_NONE, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_dhcpfo_dhcp_style_option,
|
|
{"DHCP Style Option", "dhcpfo.dhcpstyleoption",
|
|
FT_NONE, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_dhcpfo_option_code,
|
|
{"Option Code", "dhcpfo.optioncode",
|
|
FT_UINT16, BASE_DEC, VALS(option_code_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_option_length,
|
|
{"Length", "dhcpfo.optionlength",
|
|
FT_UINT16, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_binding_status,
|
|
{"Type", "dhcpfo.bindingstatus",
|
|
FT_UINT32, BASE_DEC, VALS(binding_status_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
|
|
{&hf_dhcpfo_server_state,
|
|
{"server status", "dhcpfo.serverstatus",
|
|
FT_UINT8, BASE_DEC, VALS(server_state_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
|
|
{&hf_dhcpfo_assigned_ip_address,
|
|
{"assigned ip address", "dhcpfo.assignedipaddress",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_delayed_service_parameter,
|
|
{"delayed service parameter", "dhcpfo.delayedserviceparameter",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
|
|
{&hf_dhcpfo_addresses_transferred,
|
|
{"addresses transferred", "dhcpfo.addressestransferred",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
|
|
{&hf_dhcpfo_client_identifier,
|
|
{"Client Identifier", "dhcpfo.clientidentifier",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_client_hw_type,
|
|
{"Client Hardware Type", "dhcpfo.clienthardwaretype",
|
|
FT_UINT8, BASE_HEX, VALS(arp_hrd_vals), 0x0,
|
|
NULL, HFILL }},
|
|
|
|
{&hf_dhcpfo_client_hardware_address,
|
|
{"Client Hardware Address", "dhcpfo.clienthardwareaddress",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_ftddns,
|
|
{"FTDDNS", "dhcpfo.ftddns",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_reject_reason,
|
|
{"Reject reason", "dhcpfo.rejectreason",
|
|
FT_UINT8, BASE_DEC, VALS(reject_reason_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_relationship_name,
|
|
{"Relationship name", "dhcpfo.relationshipname",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_message,
|
|
{"Message", "dhcpfo.message",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_mclt,
|
|
{"MCLT", "dhcpfo.mclt",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_vendor_class,
|
|
{"Vendor class", "dhcpfo.vendorclass",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_lease_expiration_time,
|
|
{"Lease expiration time", "dhcpfo.leaseexpirationtime",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_potential_expiration_time,
|
|
{"Potential expiration time", "dhcpfo.potentialexpirationtime",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_client_last_transaction_time,
|
|
{"Client last transaction time", "dhcpfo.clientlasttransactiontime",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_start_time_of_state,
|
|
{"Start time of state", "dhcpfo.starttimeofstate",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_vendor_option,
|
|
{"Vendor option", "dhcpfo.vendoroption",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_max_unacked_bndupd,
|
|
{"Max unacked BNDUPD", "dhcpfo.maxunackedbndupd",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_protocol_version,
|
|
{"Protocol version", "dhcpfo.protocolversion",
|
|
FT_UINT8, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_receive_timer,
|
|
{"Receive timer", "dhcpfo.receivetimer",
|
|
FT_UINT32, BASE_DEC|BASE_UNIT_STRING, &units_second_seconds, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_message_digest,
|
|
{"Message digest", "dhcpfo.messagedigest",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_hash_bucket_assignment,
|
|
{"Hash bucket assignment", "dhcpfo.hashbucketassignment",
|
|
FT_BYTES, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_ipflags,
|
|
{"IP Flags", "dhcpfo.ipflags",
|
|
FT_UINT16, BASE_HEX, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{&hf_dhcpfo_ipflags_reserved,
|
|
{"Reserved", "dhcpfo.ipflags.reserved",
|
|
FT_BOOLEAN, 8, NULL, 0x80,
|
|
NULL, HFILL }
|
|
},
|
|
{&hf_dhcpfo_ipflags_bootp,
|
|
{"BOOTP", "dhcpfo.ipflags.bootp",
|
|
FT_BOOLEAN, 8, NULL, 0x40,
|
|
NULL, HFILL }
|
|
},
|
|
{&hf_dhcpfo_ipflags_mbz,
|
|
{"MBZ", "dhcpfo.ipflags.mbz",
|
|
FT_UINT8, BASE_HEX, NULL, 0x3F,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_message_digest_type,
|
|
{"Message digest type", "dhcpfo.message_digest_type",
|
|
FT_UINT8, BASE_DEC, VALS(message_digest_type_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_tls_request,
|
|
{"TLS Request", "dhcpfo.tls_request",
|
|
FT_UINT8, BASE_DEC, VALS(tls_request_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_tls_reply,
|
|
{"TLS Reply", "dhcpfo.tls_reply",
|
|
FT_UINT8, BASE_DEC, VALS(tls_reply_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_serverflag,
|
|
{"Serverflag", "dhcpfo.serverflag",
|
|
FT_UINT8, BASE_DEC, VALS(serverflag_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
{&hf_dhcpfo_options,
|
|
{"Options", "dhcpfo.options",
|
|
FT_BYTES, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_dhcpfo,
|
|
&ett_fo_payload,
|
|
&ett_fo_option,
|
|
&ett_fo_payload_data,
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_dhcpfo_bad_length, { "dhcpfo.bad_length", PI_PROTOCOL, PI_WARN, "Bad length", EXPFILL }},
|
|
{ &ei_dhcpfo_message_digest_type_not_allowed, { "dhcpfo.message_digest_type_not_allowed", PI_PROTOCOL, PI_WARN, "Message digest type not allowed", EXPFILL }},
|
|
};
|
|
|
|
module_t *dhcpfo_module;
|
|
expert_module_t* expert_dhcpfo;
|
|
|
|
/* Register the protocol name and description */
|
|
proto_dhcpfo = proto_register_protocol("DHCP Failover", "DHCPFO", "dhcpfo");
|
|
|
|
/* 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));
|
|
expert_dhcpfo = expert_register_protocol(proto_dhcpfo);
|
|
expert_register_field_array(expert_dhcpfo, ei, array_length(ei));
|
|
|
|
dhcpfo_module = prefs_register_protocol(proto_dhcpfo, NULL);
|
|
|
|
prefs_register_bool_preference(dhcpfo_module, "desegment",
|
|
"Reassemble DHCP failover messages spanning multiple TCP segments",
|
|
"Whether the DHCP failover dissector should reassemble messages spanning multiple TCP segments."
|
|
" To use this option, you must also enable \"Allow subdissectors to reassemble TCP streams\" in the TCP protocol settings.",
|
|
&dhcpfo_desegment);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_dhcpfo(void)
|
|
{
|
|
dissector_handle_t dhcpfo_handle;
|
|
|
|
dhcpfo_handle = create_dissector_handle(dissect_dhcpfo, proto_dhcpfo);
|
|
dissector_add_uint_with_preference("tcp.port", TCP_PORT_DHCPFO, dhcpfo_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|