967 lines
32 KiB
C
967 lines
32 KiB
C
/* packet-pptp.c
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* Routines for the Point-to-Point Tunnelling Protocol (PPTP) (RFC 2637)
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* Brad Robel-Forrest <brad.robel-forrest@watchguard.com>
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*
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* 10/2010 - Rework PPTP Dissector
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* Alexis La Goutte <alexis.lagoutte at gmail dot com>
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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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#include "config.h"
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#include <epan/packet.h>
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#include <epan/expert.h>
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void proto_register_pptp(void);
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void proto_reg_handoff_pptp(void);
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static dissector_handle_t pptp_handle;
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static int proto_pptp = -1;
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static int hf_pptp_length = -1;
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static int hf_pptp_message_type = -1;
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static int hf_pptp_magic_cookie = -1;
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static int hf_pptp_control_message_type = -1;
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static int hf_pptp_reserved = -1;
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static int hf_pptp_protocol_version = -1;
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static int hf_pptp_framing_capabilities = -1;
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static int hf_pptp_bearer_capabilities = -1;
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static int hf_pptp_maximum_channels = -1;
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static int hf_pptp_firmware_revision = -1;
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static int hf_pptp_host_name = -1;
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static int hf_pptp_vendor_name = -1;
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static int hf_pptp_control_result = -1;
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static int hf_pptp_error = -1;
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static int hf_pptp_reason = -1;
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static int hf_pptp_stop_result = -1;
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static int hf_pptp_identifier = -1;
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static int hf_pptp_echo_result = -1;
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static int hf_pptp_call_id = -1;
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static int hf_pptp_call_serial_number = -1;
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static int hf_pptp_minimum_bps = -1;
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static int hf_pptp_maximum_bps = -1;
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static int hf_pptp_bearer_type = -1;
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static int hf_pptp_framing_type = -1;
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static int hf_pptp_packet_receive_window_size = -1;
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static int hf_pptp_packet_processing_delay = -1;
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static int hf_pptp_phone_number_length = -1;
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static int hf_pptp_phone_number = -1;
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static int hf_pptp_subaddress = -1;
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static int hf_pptp_peer_call_id = -1;
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static int hf_pptp_out_result = -1;
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static int hf_pptp_cause = -1;
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static int hf_pptp_connect_speed = -1;
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static int hf_pptp_physical_channel_id = -1;
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static int hf_pptp_dialed_number_length = -1;
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static int hf_pptp_dialed_number = -1;
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static int hf_pptp_dialing_number_length = -1;
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static int hf_pptp_dialing_number = -1;
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static int hf_pptp_in_result = -1;
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static int hf_pptp_disc_result = -1;
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static int hf_pptp_call_statistics = -1;
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static int hf_pptp_crc_errors = -1;
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static int hf_pptp_framing_errors = -1;
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static int hf_pptp_hardware_overruns = -1;
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static int hf_pptp_buffer_overruns = -1;
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static int hf_pptp_timeout_errors = -1;
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static int hf_pptp_alignment_errors = -1;
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static int hf_pptp_send_accm = -1;
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static int hf_pptp_receive_accm = -1;
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static gint ett_pptp = -1;
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static expert_field ei_pptp_incorrect_magic_cookie = EI_INIT;
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#define TCP_PORT_PPTP 1723
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#define MAGIC_COOKIE 0x1A2B3C4D
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#define CNTRL_REQ 0x01
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#define CNTRL_REPLY 0x02
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#define STOP_REQ 0x03
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#define STOP_REPLY 0x04
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#define ECHO_REQ 0x05
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#define ECHO_REPLY 0x06
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#define OUT_REQ 0x07
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#define OUT_REPLY 0x08
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#define IN_REQ 0x09
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#define IN_REPLY 0x0A
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#define IN_CONNECTED 0x0B
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#define CLEAR_REQ 0x0C
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#define DISC_NOTIFY 0x0D
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#define ERROR_NOTIFY 0x0E
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#define SET_LINK 0x0F
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static const value_string control_message_type_vals[] = {
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{ CNTRL_REQ, "Start-Control-Connection-Request" },
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{ CNTRL_REPLY, "Start-Control-Connection-Reply" },
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{ STOP_REQ, "Stop-Control-Connection-Request" },
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{ STOP_REPLY, "Stop-Control-Connection-Reply" },
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{ ECHO_REQ, "Echo-Request" },
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{ ECHO_REPLY, "Echo-Reply" },
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{ OUT_REQ, "Outgoing-Call-Request" },
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{ OUT_REPLY, "Outgoing-Call-Reply" },
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{ IN_REQ, "Incoming-Call-Request" },
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{ IN_REPLY, "Incoming-Call-Reply" },
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{ IN_CONNECTED, "Incoming-Call-Connected" },
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{ CLEAR_REQ, "Call-Clear-Request" },
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{ DISC_NOTIFY, "Call-Disconnect-Notify" },
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{ ERROR_NOTIFY, "WAN-Error-Notify" },
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{ SET_LINK, "Set-Link-Info" },
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{ 0, NULL },
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};
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static const value_string msgtype_vals[] = {
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{ 1, "Control Message" },
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{ 2, "Management Message" },
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{ 0, NULL }
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};
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static const value_string frametype_vals[] = {
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{ 1, "Asynchronous Framing supported" },
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{ 2, "Synchronous Framing supported"},
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{ 3, "Either Framing supported" },
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{ 0, NULL }
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};
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static const value_string bearertype_vals[] = {
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{ 1, "Analog access supported" },
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{ 2, "Digital access supported" },
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{ 3, "Either access supported" },
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{ 0, NULL }
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};
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static const value_string control_resulttype_vals[] = {
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{ 1, "Successful channel establishment" },
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{ 2, "General error" },
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{ 3, "Command channel already exists" },
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{ 4, "Requester not authorized" },
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{ 5, "Protocol version not supported" },
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{ 0, NULL }
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};
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static const value_string errortype_vals[] = {
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{ 0, "None" },
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{ 1, "Not-Connected" },
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{ 2, "Bad-Format" },
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{ 3, "Bad-Value" },
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{ 4, "No-Resource" },
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{ 5, "Bad-Call ID" },
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{ 6, "PAC-Error" },
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{ 0, NULL }
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};
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static const value_string reasontype_vals[] = {
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{ 1, "None" },
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{ 2, "Stop-Protocol" },
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{ 3, "Stop-Local-Shutdown" },
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{ 0, NULL }
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};
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static const value_string stop_resulttype_vals[] = {
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{ 1, "OK" },
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{ 2, "General error" },
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{ 0, NULL }
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};
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static const value_string echo_resulttype_vals[] = {
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{ 1, "OK" },
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{ 2, "General error" },
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{ 0, NULL }
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};
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static const value_string out_resulttype_vals[] = {
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{ 1, "Connected" },
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{ 2, "General Error" },
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{ 3, "No Carrier" },
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{ 4, "Busy" },
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{ 5, "No Dial Tone" },
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{ 6, "Time-out" },
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{ 7, "Do Not Accept" },
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{ 0, NULL }
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};
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static const value_string in_resulttype_vals[] = {
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{ 1, "Connect" },
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{ 2, "General error" },
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{ 3, "Do Not Accept" },
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{ 0, NULL }
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};
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static const value_string disc_resulttype_vals[] = {
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{ 1, "Lost Carrier" },
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{ 2, "General Error" },
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{ 3, "Admin Shutdown" },
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{ 4, "Request" },
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{ 0, NULL }
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};
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static void
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dissect_unknown(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
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{
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call_data_dissector(tvb_new_subset_remaining(tvb, offset), pinfo, tree);
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}
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static void
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dissect_cntrl_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
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{
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if (!tree)
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return;
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proto_tree_add_uint_format_value(tree, hf_pptp_protocol_version, tvb, offset,
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2, tvb_get_ntohs(tvb, offset), "%u.%u",
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tvb_get_guint8(tvb, offset), tvb_get_guint8(tvb, offset + 1));
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_framing_capabilities, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_bearer_capabilities, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_maximum_channels, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_firmware_revision, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_host_name, tvb, offset, 64, ENC_ASCII);
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offset += 64;
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proto_tree_add_item(tree, hf_pptp_vendor_name, tvb, offset, 64, ENC_ASCII);
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}
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static void
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dissect_cntrl_reply(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
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{
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if (!tree)
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return;
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proto_tree_add_uint_format_value(tree, hf_pptp_protocol_version, tvb, offset,
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2, tvb_get_ntohs(tvb, offset), "%u.%u",
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tvb_get_guint8(tvb, offset), tvb_get_guint8(tvb, offset + 1));
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_control_result, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_pptp_error, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_pptp_framing_capabilities, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_bearer_capabilities, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_maximum_channels, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_firmware_revision, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_host_name, tvb, offset, 64, ENC_ASCII);
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offset += 64;
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proto_tree_add_item(tree, hf_pptp_vendor_name, tvb, offset, 64, ENC_ASCII);
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}
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static void
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dissect_stop_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
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{
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if (!tree)
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return;
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proto_tree_add_item(tree, hf_pptp_reason, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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/* Reserved1 */
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proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 1, ENC_NA);
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offset += 1;
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/* Reserved2 */
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proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
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}
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static void
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dissect_stop_reply(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
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{
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if (!tree)
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return;
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proto_tree_add_item(tree, hf_pptp_stop_result, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_pptp_error, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
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}
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static void
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dissect_echo_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
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{
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if (!tree)
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return;
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proto_tree_add_item(tree, hf_pptp_identifier, tvb, offset, 4, ENC_BIG_ENDIAN);
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}
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static void
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dissect_echo_reply(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
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{
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if (!tree)
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return;
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proto_tree_add_item(tree, hf_pptp_identifier, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_echo_result, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_pptp_error, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
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}
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static void
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dissect_out_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
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{
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if (!tree)
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return;
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proto_tree_add_item(tree, hf_pptp_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_call_serial_number, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_minimum_bps, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_maximum_bps, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_bearer_type, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_framing_type, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_packet_receive_window_size, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_packet_processing_delay, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_phone_number_length, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_phone_number, tvb, offset, 64, ENC_ASCII);
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offset += 64;
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proto_tree_add_item(tree, hf_pptp_subaddress, tvb, offset, 64, ENC_ASCII);
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}
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static void
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dissect_out_reply(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
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{
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if (!tree)
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return;
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proto_tree_add_item(tree, hf_pptp_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_peer_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_out_result, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_pptp_error, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item(tree, hf_pptp_cause, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_connect_speed, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_packet_receive_window_size, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_packet_processing_delay, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_physical_channel_id, tvb, offset, 4, ENC_BIG_ENDIAN);
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}
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static void
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dissect_in_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
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{
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if (!tree)
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return;
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proto_tree_add_item(tree, hf_pptp_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_call_serial_number, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_bearer_type, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_physical_channel_id, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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proto_tree_add_item(tree, hf_pptp_dialed_number_length, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_dialing_number_length, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(tree, hf_pptp_dialed_number, tvb, offset, 64, ENC_ASCII);
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offset += 64;
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proto_tree_add_item(tree, hf_pptp_dialing_number, tvb, offset, 64, ENC_ASCII);
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offset += 64;
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proto_tree_add_item(tree, hf_pptp_subaddress, tvb, offset, 64, ENC_ASCII);
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}
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|
static void
|
|
dissect_in_reply(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
if (!tree)
|
|
return;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_peer_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_in_result, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_error, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_packet_receive_window_size, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_packet_processing_delay, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
|
|
}
|
|
|
|
static void
|
|
dissect_in_connected(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
if (!tree)
|
|
return;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_peer_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_connect_speed, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_packet_receive_window_size, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_packet_processing_delay, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_framing_type, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_clear_req(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
if (!tree)
|
|
return;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
|
|
}
|
|
|
|
static void
|
|
dissect_disc_notify(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
if (!tree)
|
|
return;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_disc_result, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_error, tvb, offset, 1, ENC_BIG_ENDIAN);
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_cause, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_call_statistics, tvb, offset, 64, ENC_ASCII);
|
|
}
|
|
|
|
static void
|
|
dissect_error_notify(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
if (!tree)
|
|
return;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_peer_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_crc_errors, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_framing_errors, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_hardware_overruns, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_buffer_overruns, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_timeout_errors, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_alignment_errors, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_set_link(tvbuff_t *tvb, int offset, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
if (!tree)
|
|
return;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_peer_call_id, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 2, ENC_NA);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_send_accm, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_receive_accm, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
}
|
|
|
|
static int
|
|
dissect_pptp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
|
|
{
|
|
proto_tree *pptp_tree = NULL;
|
|
proto_item *item = NULL;
|
|
int offset = 0;
|
|
guint16 len;
|
|
guint16 control_message_type;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "PPTP");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
len = tvb_get_ntohs(tvb, offset);
|
|
control_message_type = tvb_get_ntohs(tvb, offset + 8);
|
|
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str(control_message_type, control_message_type_vals,
|
|
"Unknown control type (%d)"));
|
|
|
|
if (tree) {
|
|
proto_item *ti;
|
|
|
|
ti = proto_tree_add_item(tree, proto_pptp, tvb, offset, len, ENC_NA);
|
|
pptp_tree = proto_item_add_subtree(ti, ett_pptp);
|
|
|
|
proto_tree_add_item(pptp_tree, hf_pptp_length, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
proto_tree_add_item(pptp_tree, hf_pptp_message_type, tvb, offset+2, 2, ENC_BIG_ENDIAN);
|
|
|
|
item = proto_tree_add_item(pptp_tree, hf_pptp_magic_cookie, tvb, offset+4, 4, ENC_BIG_ENDIAN);
|
|
}
|
|
|
|
if (tvb_get_ntohl(tvb, offset+4) == MAGIC_COOKIE)
|
|
proto_item_append_text(item," (correct)");
|
|
else {
|
|
proto_item_append_text(item," (incorrect)");
|
|
expert_add_info(pinfo, item, &ei_pptp_incorrect_magic_cookie);
|
|
}
|
|
|
|
if (tree) {
|
|
proto_tree_add_item(pptp_tree, hf_pptp_control_message_type, tvb, offset+8, 2, ENC_BIG_ENDIAN);
|
|
|
|
proto_tree_add_item(pptp_tree, hf_pptp_reserved, tvb, offset+10, 2, ENC_NA);
|
|
}
|
|
|
|
offset += offset + 12;
|
|
|
|
switch(control_message_type){
|
|
case CNTRL_REQ: /* Start-Control-Connection-Request */
|
|
dissect_cntrl_req(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case CNTRL_REPLY: /* Start-Control-Connection-Reply */
|
|
dissect_cntrl_reply(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case STOP_REQ: /* Stop-Control-Connection-Request */
|
|
dissect_stop_req(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case STOP_REPLY: /* Stop-Control-Connection-Reply */
|
|
dissect_stop_reply(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case ECHO_REQ: /* Echo-Request */
|
|
dissect_echo_req(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case ECHO_REPLY: /* Echo-Reply */
|
|
dissect_echo_reply(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case OUT_REQ: /* Outgoing-Call-Request */
|
|
dissect_out_req(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case OUT_REPLY: /* Outgoing-Call-Reply */
|
|
dissect_out_reply(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case IN_REQ: /* Incoming-Call-Request */
|
|
dissect_in_req(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case IN_REPLY: /* Incoming-Call-Reply */
|
|
dissect_in_reply(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case IN_CONNECTED: /* Incoming-Call-Connected */
|
|
dissect_in_connected(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case CLEAR_REQ: /* Call-Clear-Request */
|
|
dissect_clear_req(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case DISC_NOTIFY: /* Call-Disconnect-Notify */
|
|
dissect_disc_notify(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case ERROR_NOTIFY: /* WAN-Error-Notify */
|
|
dissect_error_notify(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
case SET_LINK: /* Set-Link-Info */
|
|
dissect_set_link(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
default: /* Unknown Type... */
|
|
dissect_unknown(tvb, offset, pinfo, pptp_tree);
|
|
break;
|
|
}
|
|
return tvb_captured_length(tvb);
|
|
}
|
|
|
|
void
|
|
proto_register_pptp(void)
|
|
{
|
|
static gint *ett[] = {
|
|
&ett_pptp,
|
|
};
|
|
|
|
static hf_register_info hf[] = {
|
|
{ &hf_pptp_length,
|
|
{ "Length", "pptp.length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Total length in octets of this PPTP message", HFILL }
|
|
},
|
|
{ &hf_pptp_message_type,
|
|
{ "Message type", "pptp.type",
|
|
FT_UINT16, BASE_DEC, VALS(msgtype_vals), 0x0,
|
|
"PPTP message type", HFILL }
|
|
},
|
|
{ &hf_pptp_magic_cookie,
|
|
{ "Magic Cookie", "pptp.magic_cookie",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
"This constant value is used as a sanity check on received messages", HFILL }
|
|
},
|
|
{ &hf_pptp_control_message_type,
|
|
{ "Control Message Type", "pptp.control_message_type",
|
|
FT_UINT16, BASE_DEC, VALS(control_message_type_vals), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_pptp_reserved,
|
|
{ "Reserved", "pptp.reserved",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
|
"This field MUST be 0", HFILL }
|
|
},
|
|
{ &hf_pptp_protocol_version,
|
|
{ "Protocol version", "pptp.protocol_version",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"The version of the PPTP protocol", HFILL }
|
|
},
|
|
{ &hf_pptp_framing_capabilities,
|
|
{ "Framing Capabilities", "pptp.framing_capabilities",
|
|
FT_UINT32, BASE_DEC, VALS(frametype_vals), 0x0,
|
|
"A set of bits indicating the type of framing", HFILL }
|
|
},
|
|
{ &hf_pptp_bearer_capabilities,
|
|
{ "Bearer Capabilities", "pptp.bearer_capabilities",
|
|
FT_UINT32, BASE_DEC, VALS(bearertype_vals), 0x0,
|
|
"A set of bits indicating the type of bearer", HFILL }
|
|
},
|
|
{ &hf_pptp_maximum_channels,
|
|
{ "Maximum Channels", "pptp.maximum_channels",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"The total number of individual PPP sessions this PAC can support", HFILL }
|
|
},
|
|
{ &hf_pptp_firmware_revision,
|
|
{ "Firmware Revision", "pptp.firmware_revision",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"This field contains the firmware revision", HFILL }
|
|
},
|
|
{ &hf_pptp_host_name,
|
|
{ "Host Name", "pptp.host_name",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"A 64 octet field containing the DNS name", HFILL }
|
|
},
|
|
{ &hf_pptp_vendor_name,
|
|
{ "Vendor Name", "pptp.vendor_name",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"A 64 octet field containing a vendor", HFILL }
|
|
},
|
|
{ &hf_pptp_control_result,
|
|
{ "Result Code", "pptp.control_result",
|
|
FT_UINT8, BASE_DEC, VALS(control_resulttype_vals), 0x0,
|
|
"Indicates the result of the command channel establishment attempt", HFILL }
|
|
},
|
|
{ &hf_pptp_error,
|
|
{ "Error Code", "pptp.error",
|
|
FT_UINT8, BASE_DEC, VALS(errortype_vals), 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_pptp_reason,
|
|
{ "Reason", "pptp.reason",
|
|
FT_UINT8, BASE_DEC, VALS(reasontype_vals), 0x0,
|
|
"Indicates the reason for the control connection being close", HFILL }
|
|
},
|
|
{ &hf_pptp_stop_result,
|
|
{ "Result Code", "pptp.stop_result",
|
|
FT_UINT8, BASE_DEC, VALS(stop_resulttype_vals), 0x0,
|
|
"Indicates the result of the attempt to close the control connection", HFILL }
|
|
},
|
|
{ &hf_pptp_identifier,
|
|
{ "Identifier", "pptp.identifier",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_pptp_echo_result,
|
|
{ "Result Code", "pptp.echo_result",
|
|
FT_UINT8, BASE_DEC, VALS(echo_resulttype_vals), 0x0,
|
|
"Indicates the result of the receipt of the Echo-Request", HFILL }
|
|
},
|
|
{ &hf_pptp_call_id,
|
|
{ "Call ID", "pptp.call_id",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"A unique identifier, unique to a particular PAC-PNS pair assigned by the PNS", HFILL }
|
|
},
|
|
{ &hf_pptp_call_serial_number,
|
|
{ "Call Serial Number", "pptp.call_serial_number",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"An identifier assigned by the PNS to this session for the purpose of identifying this particular session in logged session information", HFILL }
|
|
},
|
|
{ &hf_pptp_minimum_bps,
|
|
{ "Minimum BPS", "pptp.minimum_bps",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"The lowest acceptable line speed (in bits/second) for this session", HFILL }
|
|
},
|
|
{ &hf_pptp_maximum_bps,
|
|
{ "Maximum BPS", "pptp.maximum_bps",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"The highest acceptable line speed (in bits/second) for this session", HFILL }
|
|
},
|
|
{ &hf_pptp_framing_type,
|
|
{ "Framing Type", "pptp.framing_type",
|
|
FT_UINT32, BASE_DEC, VALS(frametype_vals), 0x0,
|
|
"A value indicating the type of PPP framing to be used for this outgoing call", HFILL }
|
|
},
|
|
{ &hf_pptp_bearer_type,
|
|
{ "Bearer Type", "pptp.bearer_type",
|
|
FT_UINT32, BASE_DEC, VALS(bearertype_vals), 0x0,
|
|
"A value indicating the bearer capability required for this outgoing call", HFILL }
|
|
},
|
|
{ &hf_pptp_packet_receive_window_size,
|
|
{ "Packet Receive Window Size", "pptp.packet_receive_window_size",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"A unique identifier, unique to a particular PAC-PNS pair assigned by the PNS", HFILL }
|
|
},
|
|
{ &hf_pptp_packet_processing_delay,
|
|
{ "Packet Processing Delay", "pptp.packet_processing_delay",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"A measure of the packet processing delay that might be imposed on data sent to the PNS from the PAC", HFILL }
|
|
},
|
|
{ &hf_pptp_phone_number_length,
|
|
{ "Phone Number Length", "pptp.phone_number_length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"The actual number of valid digits in the Phone Number field", HFILL }
|
|
},
|
|
{ &hf_pptp_phone_number,
|
|
{ "Phone Number", "pptp.phone_number",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"The number to be dialed to establish the outgoing session", HFILL }
|
|
},
|
|
{ &hf_pptp_subaddress,
|
|
{ "Subaddress", "pptp.subaddress",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"A 64 octet field used to specify additional dialing information.", HFILL }
|
|
},
|
|
{ &hf_pptp_peer_call_id,
|
|
{ "Peer Call ID", "pptp.peer_call_id",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"This field is set to the value received in the Call ID field of the corresponding Outgoing-Call-Request message", HFILL }
|
|
},
|
|
{ &hf_pptp_out_result,
|
|
{ "Result Code", "pptp.out_result",
|
|
FT_UINT8, BASE_DEC, VALS(out_resulttype_vals), 0x0,
|
|
"Indicates the result of the receipt of the Outgoing-Call-Request attempt", HFILL }
|
|
},
|
|
{ &hf_pptp_cause,
|
|
{ "Cause Code", "pptp.cause",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"This field gives additional information", HFILL }
|
|
},
|
|
{ &hf_pptp_connect_speed,
|
|
{ "Connect Speed", "pptp.connect_speed",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"The actual connection speed used, in bits/second.", HFILL }
|
|
},
|
|
{ &hf_pptp_physical_channel_id,
|
|
{ "Physical Channel ID", "pptp.physical_channel_id",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"This field is set by the PAC in a vendor-specific manner to the physical channel number used to place this call", HFILL }
|
|
},
|
|
{ &hf_pptp_dialed_number_length,
|
|
{ "Dialed Number Length", "pptp.dialed_number_length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"The actual number of valid digits in the Dialed Number field", HFILL }
|
|
},
|
|
{ &hf_pptp_dialed_number,
|
|
{ "Dialed Number", "pptp.dialed_number",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"The number that was dialed by the caller", HFILL }
|
|
},
|
|
|
|
{ &hf_pptp_dialing_number_length,
|
|
{ "Dialing Number Length", "pptp.dialing_number_length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"The actual number of valid digits in the Dialing Number field", HFILL }
|
|
},
|
|
{ &hf_pptp_dialing_number,
|
|
{ "Dialing Number", "pptp.dialing_number",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"The number from which the call was placed", HFILL }
|
|
},
|
|
{ &hf_pptp_in_result,
|
|
{ "Result Code", "pptp.in_result",
|
|
FT_UINT8, BASE_DEC, VALS(in_resulttype_vals), 0x0,
|
|
"This value indicates the result of the Incoming-Call-Request attempt", HFILL }
|
|
},
|
|
{ &hf_pptp_disc_result,
|
|
{ "Result Code", "pptp.disc_result",
|
|
FT_UINT8, BASE_DEC, VALS(disc_resulttype_vals), 0x0,
|
|
"This value indicates the reason for the disconnect", HFILL }
|
|
},
|
|
{ &hf_pptp_call_statistics,
|
|
{ "Call Statistics", "pptp.call_Statistics",
|
|
FT_STRING, BASE_NONE, NULL, 0x0,
|
|
"This field is an ASCII string containing vendor-specific call statistics that can be logged for diagnostic purpose", HFILL }
|
|
},
|
|
{ &hf_pptp_crc_errors,
|
|
{ "CRC Errors", "pptp.crc_errors",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Number of PPP frames received with CRC errors since session was established", HFILL }
|
|
},
|
|
{ &hf_pptp_framing_errors,
|
|
{ "Framing Errors", "pptp.framing_errors",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Number of improperly framed PPP packets received", HFILL }
|
|
},
|
|
{ &hf_pptp_hardware_overruns,
|
|
{ "Hardware overruns", "pptp.hardware_overruns",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Number of receive buffer over-runs since session was established", HFILL }
|
|
},
|
|
{ &hf_pptp_buffer_overruns,
|
|
{ "Buffer overruns", "pptp.buffer_overruns",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Number of buffer over-runs detected since session was established", HFILL }
|
|
},
|
|
{ &hf_pptp_timeout_errors,
|
|
{ "Time-out Errors", "pptp.timeout_errors",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Number of time-outs since call was established", HFILL }
|
|
},
|
|
{ &hf_pptp_alignment_errors,
|
|
{ "Alignment Errors", "pptp.alignment_errors",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Number of Alignment errors since call was established", HFILL }
|
|
},
|
|
{ &hf_pptp_send_accm,
|
|
{ "Send ACCM", "pptp.send_accm",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
"The send ACCM value the client should use to process outgoing PPP packets", HFILL }
|
|
},
|
|
{ &hf_pptp_receive_accm,
|
|
{ "Receive ACCM", "pptp.receive_accm",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
"The Receive ACCM value the client should use to process incoming PPP packets", HFILL }
|
|
},
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_pptp_incorrect_magic_cookie, { "pptp.magic_cookie.incorrect", PI_PROTOCOL, PI_WARN, "Incorrect Magic Cookie", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_pptp;
|
|
|
|
proto_pptp = proto_register_protocol("Point-to-Point Tunnelling Protocol",
|
|
"PPTP", "pptp");
|
|
pptp_handle = register_dissector("pptp", dissect_pptp, proto_pptp);
|
|
proto_register_field_array(proto_pptp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_pptp = expert_register_protocol(proto_pptp);
|
|
expert_register_field_array(expert_pptp, ei, array_length(ei));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_pptp(void)
|
|
{
|
|
dissector_add_uint_with_preference("tcp.port", TCP_PORT_PPTP, pptp_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|