/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * RDP Core
 *
 * Copyright 2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 * Copyright 2014 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef FREERDP_LIB_CORE_RDP_H
#define FREERDP_LIB_CORE_RDP_H

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "nla.h"
#include "mcs.h"
#include "tpkt.h"
#include "bulk.h"
#include "fastpath.h"
#include "tpdu.h"
#include "nego.h"
#include "input.h"
#include "update.h"
#include "license.h"
#include "errinfo.h"
#include "autodetect.h"
#include "heartbeat.h"
#include "multitransport.h"
#include "security.h"
#include "transport.h"
#include "connection.h"
#include "redirection.h"
#include "capabilities.h"
#include "channels.h"

#include <freerdp/freerdp.h>
#include <freerdp/settings.h>
#include <freerdp/log.h>
#include <freerdp/api.h>

#include <winpr/stream.h>
#include <winpr/crypto.h>

/* Security Header Flags */
#define SEC_EXCHANGE_PKT 0x0001
#define SEC_TRANSPORT_REQ 0x0002
#define SEC_TRANSPORT_RSP 0x0004
#define SEC_ENCRYPT 0x0008
#define SEC_RESET_SEQNO 0x0010
#define SEC_IGNORE_SEQNO 0x0020
#define SEC_INFO_PKT 0x0040
#define SEC_LICENSE_PKT 0x0080
#define SEC_LICENSE_ENCRYPT_CS 0x0200
#define SEC_LICENSE_ENCRYPT_SC 0x0200
#define SEC_REDIRECTION_PKT 0x0400
#define SEC_SECURE_CHECKSUM 0x0800
#define SEC_AUTODETECT_REQ 0x1000
#define SEC_AUTODETECT_RSP 0x2000
#define SEC_HEARTBEAT 0x4000
#define SEC_FLAGSHI_VALID 0x8000

#define SEC_PKT_CS_MASK (SEC_EXCHANGE_PKT | SEC_INFO_PKT)
#define SEC_PKT_SC_MASK (SEC_LICENSE_PKT | SEC_REDIRECTION_PKT)
#define SEC_PKT_MASK (SEC_PKT_CS_MASK | SEC_PKT_SC_MASK)

#define RDP_SECURITY_HEADER_LENGTH 4
#define RDP_SHARE_CONTROL_HEADER_LENGTH 6
#define RDP_SHARE_DATA_HEADER_LENGTH 12
#define RDP_PACKET_HEADER_MAX_LENGTH (TPDU_DATA_LENGTH + MCS_SEND_DATA_HEADER_MAX_LENGTH)

#define PDU_TYPE_DEMAND_ACTIVE 0x1
#define PDU_TYPE_CONFIRM_ACTIVE 0x3
#define PDU_TYPE_DEACTIVATE_ALL 0x6
#define PDU_TYPE_DATA 0x7
#define PDU_TYPE_SERVER_REDIRECTION 0xA

#define PDU_TYPE_FLOW_TEST 0x41
#define PDU_TYPE_FLOW_RESPONSE 0x42
#define PDU_TYPE_FLOW_STOP 0x43

#define FINALIZE_SC_SYNCHRONIZE_PDU 0x01
#define FINALIZE_SC_CONTROL_COOPERATE_PDU 0x02
#define FINALIZE_SC_CONTROL_GRANTED_PDU 0x04
#define FINALIZE_SC_FONT_MAP_PDU 0x08
#define FINALIZE_SC_COMPLETE 0x0F

/* Data PDU Types */
#define DATA_PDU_TYPE_UPDATE 0x02
#define DATA_PDU_TYPE_CONTROL 0x14
#define DATA_PDU_TYPE_POINTER 0x1B
#define DATA_PDU_TYPE_INPUT 0x1C
#define DATA_PDU_TYPE_SYNCHRONIZE 0x1F
#define DATA_PDU_TYPE_REFRESH_RECT 0x21
#define DATA_PDU_TYPE_PLAY_SOUND 0x22
#define DATA_PDU_TYPE_SUPPRESS_OUTPUT 0x23
#define DATA_PDU_TYPE_SHUTDOWN_REQUEST 0x24
#define DATA_PDU_TYPE_SHUTDOWN_DENIED 0x25
#define DATA_PDU_TYPE_SAVE_SESSION_INFO 0x26
#define DATA_PDU_TYPE_FONT_LIST 0x27
#define DATA_PDU_TYPE_FONT_MAP 0x28
#define DATA_PDU_TYPE_SET_KEYBOARD_INDICATORS 0x29
#define DATA_PDU_TYPE_BITMAP_CACHE_PERSISTENT_LIST 0x2B
#define DATA_PDU_TYPE_BITMAP_CACHE_ERROR 0x2C
#define DATA_PDU_TYPE_SET_KEYBOARD_IME_STATUS 0x2D
#define DATA_PDU_TYPE_OFFSCREEN_CACHE_ERROR 0x2E
#define DATA_PDU_TYPE_SET_ERROR_INFO 0x2F
#define DATA_PDU_TYPE_DRAW_NINEGRID_ERROR 0x30
#define DATA_PDU_TYPE_DRAW_GDIPLUS_ERROR 0x31
#define DATA_PDU_TYPE_ARC_STATUS 0x32
#define DATA_PDU_TYPE_STATUS_INFO 0x36
#define DATA_PDU_TYPE_MONITOR_LAYOUT 0x37
#define DATA_PDU_TYPE_FRAME_ACKNOWLEDGE 0x38

/* Stream Identifiers */
#define STREAM_UNDEFINED 0x00
#define STREAM_LOW 0x01
#define STREAM_MED 0x02
#define STREAM_HI 0x04

struct rdp_rdp
{
	int state;
	freerdp* instance;
	rdpContext* context;
	rdpNla* nla;
	rdpMcs* mcs;
	rdpNego* nego;
	rdpBulk* bulk;
	rdpInput* input;
	rdpUpdate* update;
	rdpFastPath* fastpath;
	rdpLicense* license;
	rdpRedirection* redirection;
	rdpSettings* settings;
	rdpTransport* transport;
	rdpAutoDetect* autodetect;
	rdpHeartbeat* heartbeat;
	rdpMultitransport* multitransport;
	WINPR_RC4_CTX* rc4_decrypt_key;
	int decrypt_use_count;
	int decrypt_checksum_use_count;
	WINPR_RC4_CTX* rc4_encrypt_key;
	int encrypt_use_count;
	int encrypt_checksum_use_count;
	WINPR_CIPHER_CTX* fips_encrypt;
	WINPR_CIPHER_CTX* fips_decrypt;
	UINT32 sec_flags;
	BOOL do_crypt;
	BOOL do_crypt_license;
	BOOL do_secure_checksum;
	BYTE sign_key[16];
	BYTE decrypt_key[16];
	BYTE encrypt_key[16];
	BYTE decrypt_update_key[16];
	BYTE encrypt_update_key[16];
	int rc4_key_len;
	BYTE fips_sign_key[20];
	BYTE fips_encrypt_key[24];
	BYTE fips_decrypt_key[24];
	UINT32 errorInfo;
	UINT32 finalize_sc_pdus;
	BOOL resendFocus;
	BOOL deactivation_reactivation;
	BOOL AwaitCapabilities;
	UINT64 inBytes;
	UINT64 inPackets;
	UINT64 outBytes;
	UINT64 outPackets;
	CRITICAL_SECTION critical;
};

FREERDP_LOCAL BOOL rdp_read_security_header(wStream* s, UINT16* flags, UINT16* length);
FREERDP_LOCAL void rdp_write_security_header(wStream* s, UINT16 flags);

FREERDP_LOCAL BOOL rdp_read_share_control_header(wStream* s, UINT16* tpktLength,
                                                 UINT16* remainingLength, UINT16* type,
                                                 UINT16* channel_id);

FREERDP_LOCAL BOOL rdp_read_share_data_header(wStream* s, UINT16* length, BYTE* type,
                                              UINT32* share_id, BYTE* compressed_type,
                                              UINT16* compressed_len);

FREERDP_LOCAL wStream* rdp_send_stream_init(rdpRdp* rdp);
FREERDP_LOCAL wStream* rdp_send_stream_pdu_init(rdpRdp* rdp);

FREERDP_LOCAL BOOL rdp_read_header(rdpRdp* rdp, wStream* s, UINT16* length, UINT16* channel_id);
FREERDP_LOCAL void rdp_write_header(rdpRdp* rdp, wStream* s, UINT16 length, UINT16 channel_id);

FREERDP_LOCAL BOOL rdp_send_pdu(rdpRdp* rdp, wStream* s, UINT16 type, UINT16 channel_id);

FREERDP_LOCAL wStream* rdp_data_pdu_init(rdpRdp* rdp);
FREERDP_LOCAL BOOL rdp_send_data_pdu(rdpRdp* rdp, wStream* s, BYTE type, UINT16 channel_id);
FREERDP_LOCAL int rdp_recv_data_pdu(rdpRdp* rdp, wStream* s);

FREERDP_LOCAL BOOL rdp_send(rdpRdp* rdp, wStream* s, UINT16 channelId);

FREERDP_LOCAL BOOL rdp_send_channel_data(rdpRdp* rdp, UINT16 channelId, const BYTE* data,
                                         size_t size);

FREERDP_LOCAL wStream* rdp_message_channel_pdu_init(rdpRdp* rdp);
FREERDP_LOCAL BOOL rdp_send_message_channel_pdu(rdpRdp* rdp, wStream* s, UINT16 sec_flags);
FREERDP_LOCAL int rdp_recv_message_channel_pdu(rdpRdp* rdp, wStream* s, UINT16 securityFlags);

FREERDP_LOCAL int rdp_recv_out_of_sequence_pdu(rdpRdp* rdp, wStream* s);

FREERDP_LOCAL int rdp_recv_callback(rdpTransport* transport, wStream* s, void* extra);

FREERDP_LOCAL int rdp_check_fds(rdpRdp* rdp);

FREERDP_LOCAL rdpRdp* rdp_new(rdpContext* context);
FREERDP_LOCAL void rdp_reset(rdpRdp* rdp);
FREERDP_LOCAL void rdp_free(rdpRdp* rdp);

#define RDP_TAG FREERDP_TAG("core.rdp")
#ifdef WITH_DEBUG_RDP
#define DEBUG_RDP(...) WLog_DBG(RDP_TAG, __VA_ARGS__)
#else
#define DEBUG_RDP(...) \
	do                 \
	{                  \
	} while (0)
#endif

const char* data_pdu_type_to_string(UINT8 type);
const char* pdu_type_to_str(UINT16 pduType);

BOOL rdp_decrypt(rdpRdp* rdp, wStream* s, UINT16* pLength, UINT16 securityFlags);

BOOL rdp_set_error_info(rdpRdp* rdp, UINT32 errorInfo);
BOOL rdp_send_error_info(rdpRdp* rdp);

#endif /* FREERDP_LIB_CORE_RDP_H */
