1e60d63c8c
This saves many dissectors the need to find the data dissector and store a handle to it. There were also some that were finding it, but not using it. For others this was the only reason for their handoff function, so it could be eliminated. Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b Reviewed-on: https://code.wireshark.org/review/14530 Petri-Dish: Michael Mann <mmann78@netscape.net> Reviewed-by: Michael Mann <mmann78@netscape.net>
979 lines
32 KiB
C
979 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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 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|ENC_NA);
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offset += 64;
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proto_tree_add_item(tree, hf_pptp_vendor_name, tvb, offset, 64, ENC_ASCII|ENC_NA);
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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|ENC_NA);
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offset += 64;
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proto_tree_add_item(tree, hf_pptp_vendor_name, tvb, offset, 64, ENC_ASCII|ENC_NA);
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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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proto_tree_add_item(tree, hf_pptp_reserved, tvb, offset, 1, ENC_NA);
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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_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|ENC_NA);
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offset += 64;
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proto_tree_add_item(tree, hf_pptp_subaddress, tvb, offset, 64, ENC_ASCII|ENC_NA);
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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);
|
|
offset += 4;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_dialed_number_length, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_dialing_number_length, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_dialed_number, tvb, offset, 64, ENC_ASCII|ENC_NA);
|
|
offset += 64;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_dialing_number, tvb, offset, 64, ENC_ASCII|ENC_NA);
|
|
offset += 64;
|
|
|
|
proto_tree_add_item(tree, hf_pptp_subaddress, tvb, offset, 64, ENC_ASCII|ENC_NA);
|
|
}
|
|
|
|
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|ENC_NA);
|
|
}
|
|
|
|
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");
|
|
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_handle_t pptp_handle;
|
|
|
|
pptp_handle = create_dissector_handle(dissect_pptp, proto_pptp);
|
|
dissector_add_uint("tcp.port", TCP_PORT_PPTP, pptp_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://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:
|
|
*/
|