/**
 * 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.
 */

#include <freerdp/config.h>

#include "settings.h"

#include <winpr/crt.h>
#include <winpr/string.h>
#include <winpr/synch.h>
#include <winpr/assert.h>
#include <winpr/cast.h>
#include <winpr/json.h>
#include <winpr/ssl.h>

#include "rdp.h"

#include "state.h"
#include "info.h"
#include "utils.h"
#include "mcs.h"
#include "redirection.h"

#include <freerdp/codec/bulk.h>
#include <freerdp/crypto/per.h>
#include <freerdp/log.h>
#include <freerdp/buildflags.h>

#define RDP_TAG FREERDP_TAG("core.rdp")

typedef struct
{
	const char* file;
	const char* fkt;
	size_t line;
	DWORD level;
} log_line_t;

static const char* DATA_PDU_TYPE_STRINGS[80] = {
	"?",
	"?",      /* 0x00 - 0x01 */
	"Update", /* 0x02 */
	"?",
	"?",
	"?",
	"?",
	"?",
	"?",
	"?",
	"?", /* 0x03 - 0x0A */
	"?",
	"?",
	"?",
	"?",
	"?",
	"?",
	"?",
	"?",
	"?",       /* 0x0B - 0x13 */
	"Control", /* 0x14 */
	"?",
	"?",
	"?",
	"?",
	"?",
	"?",       /* 0x15 - 0x1A */
	"Pointer", /* 0x1B */
	"Input",   /* 0x1C */
	"?",
	"?",                            /* 0x1D - 0x1E */
	"Synchronize",                  /* 0x1F */
	"?",                            /* 0x20 */
	"Refresh Rect",                 /* 0x21 */
	"Play Sound",                   /* 0x22 */
	"Suppress Output",              /* 0x23 */
	"Shutdown Request",             /* 0x24 */
	"Shutdown Denied",              /* 0x25 */
	"Save Session Info",            /* 0x26 */
	"Font List",                    /* 0x27 */
	"Font Map",                     /* 0x28 */
	"Set Keyboard Indicators",      /* 0x29 */
	"?",                            /* 0x2A */
	"Bitmap Cache Persistent List", /* 0x2B */
	"Bitmap Cache Error",           /* 0x2C */
	"Set Keyboard IME Status",      /* 0x2D */
	"Offscreen Cache Error",        /* 0x2E */
	"Set Error Info",               /* 0x2F */
	"Draw Nine Grid Error",         /* 0x30 */
	"Draw GDI+ Error",              /* 0x31 */
	"ARC Status",                   /* 0x32 */
	"?",
	"?",
	"?",              /* 0x33 - 0x35 */
	"Status Info",    /* 0x36 */
	"Monitor Layout", /* 0x37 */
	"FrameAcknowledge",
	"?",
	"?", /* 0x38 - 0x40 */
	"?",
	"?",
	"?",
	"?",
	"?",
	"?" /* 0x41 - 0x46 */
};

#define rdp_check_monitor_layout_pdu_state(rdp, expected) \
	rdp_check_monitor_layout_pdu_state_(rdp, expected, __FILE__, __func__, __LINE__)

static BOOL rdp_check_monitor_layout_pdu_state_(const rdpRdp* rdp, BOOL expected, const char* file,
                                                const char* fkt, size_t line)
{
	WINPR_ASSERT(rdp);
	if (expected != rdp->monitor_layout_pdu)
	{
		const DWORD log_level = WLOG_ERROR;
		if (WLog_IsLevelActive(rdp->log, log_level))
		{
			WLog_PrintTextMessage(rdp->log, log_level, line, file, fkt,
			                      "Expected rdp->monitor_layout_pdu == %s",
			                      expected ? "TRUE" : "FALSE");
		}
		return FALSE;
	}
	return TRUE;
}

#define rdp_set_monitor_layout_pdu_state(rdp, expected) \
	rdp_set_monitor_layout_pdu_state_(rdp, expected, __FILE__, __func__, __LINE__)
static BOOL rdp_set_monitor_layout_pdu_state_(rdpRdp* rdp, BOOL value, const char* file,
                                              const char* fkt, size_t line)
{

	WINPR_ASSERT(rdp);
	if (value && (value == rdp->monitor_layout_pdu))
	{
		const DWORD log_level = WLOG_WARN;
		if (WLog_IsLevelActive(rdp->log, log_level))
		{
			WLog_PrintTextMessage(rdp->log, log_level, line, file, fkt,
			                      "rdp->monitor_layout_pdu == TRUE, expected FALSE");
		}
		return FALSE;
	}
	rdp->monitor_layout_pdu = value;
	return TRUE;
}

const char* data_pdu_type_to_string(UINT8 type)
{
	if (type >= ARRAYSIZE(DATA_PDU_TYPE_STRINGS))
		return "???";
	return DATA_PDU_TYPE_STRINGS[type];
}

static BOOL rdp_read_flow_control_pdu(rdpRdp* rdp, wStream* s, UINT16* type, UINT16* channel_id);
static BOOL rdp_write_share_control_header(rdpRdp* rdp, wStream* s, size_t length, UINT16 type,
                                           UINT16 channel_id);
static BOOL rdp_write_share_data_header(rdpRdp* rdp, wStream* s, size_t length, BYTE type,
                                        UINT32 share_id);

/**
 * @brief Read RDP Security Header.
 * msdn{cc240579}
 *
 * @param s stream
 * @param flags security flags
 *
 * @return \b TRUE for success, \b FALSE otherwise
 */

BOOL rdp_read_security_header(rdpRdp* rdp, wStream* s, UINT16* flags, UINT16* length)
{
	char buffer[256] = WINPR_C_ARRAY_INIT;
	WINPR_ASSERT(s);
	WINPR_ASSERT(flags);
	WINPR_ASSERT(rdp);

	/* Basic Security Header */
	if ((length && (*length < 4)))
	{
		WLog_Print(rdp->log, WLOG_WARN,
		           "invalid security header length, have %" PRIu16 ", must be >= 4", *length);
		return FALSE;
	}
	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 4))
		return FALSE;

	*flags = Stream_Get_UINT16(s);                 /* flags */
	const uint16_t flagsHi = Stream_Get_UINT16(s); /* flagsHi (unused) */
	if ((*flags & SEC_FLAGSHI_VALID) != 0)
	{
		WLog_Print(rdp->log, WLOG_WARN,
		           "[MS-RDPBCGR] 2.2.8.1.1.2.1 Basic (TS_SECURITY_HEADER) SEC_FLAGSHI_VALID field "
		           "set: flagsHi=0x%04" PRIx16,
		           flagsHi);
	}
	WLog_Print(rdp->log, WLOG_TRACE, "%s",
	           rdp_security_flag_string(*flags, buffer, sizeof(buffer)));
	if (length)
		*length -= 4;

	return TRUE;
}

/**
 * Write RDP Security Header.
 * msdn{cc240579}
 * @param s stream
 * @param flags security flags
 *
 * @return \b TRUE for success, \b FALSE otherwise
 */

BOOL rdp_write_security_header(rdpRdp* rdp, wStream* s, UINT16 flags)
{
	char buffer[256] = WINPR_C_ARRAY_INIT;
	WINPR_ASSERT(s);
	WINPR_ASSERT(rdp);

	if (!Stream_CheckAndLogRequiredCapacityWLog(rdp->log, (s), 4))
		return FALSE;

	WLog_Print(rdp->log, WLOG_TRACE, "%s", rdp_security_flag_string(flags, buffer, sizeof(buffer)));
	/* Basic Security Header */
	WINPR_ASSERT((flags & SEC_FLAGSHI_VALID) == 0); /* SEC_FLAGSHI_VALID is unsupported */
	Stream_Write_UINT16(s, flags);                  /* flags */
	Stream_Write_UINT16(s, 0);                      /* flagsHi (unused) */
	return TRUE;
}

BOOL rdp_read_share_control_header(rdpRdp* rdp, wStream* s, UINT16* tpktLength,
                                   UINT16* remainingLength, UINT16* type, UINT16* channel_id)
{
	UINT16 len = 0;
	UINT16 tmp = 0;

	WINPR_ASSERT(rdp);
	WINPR_ASSERT(s);
	WINPR_ASSERT(type);
	WINPR_ASSERT(channel_id);

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 2))
		return FALSE;

	/* Share Control Header */
	Stream_Read_UINT16(s, len); /* totalLength */

	/* If length is 0x8000 then we actually got a flow control PDU that we should ignore
	 http://msdn.microsoft.com/en-us/library/cc240576.aspx */
	if (len == 0x8000)
	{
		if (!rdp_read_flow_control_pdu(rdp, s, type, channel_id))
			return FALSE;
		*channel_id = 0;
		if (tpktLength)
			*tpktLength = 8; /* Flow control PDU is 8 bytes */
		if (remainingLength)
			*remainingLength = 0;

		char buffer[128] = WINPR_C_ARRAY_INIT;
		WLog_Print(rdp->log, WLOG_DEBUG,
		           "[Flow control PDU] type=%s, tpktLength=%" PRIu16 ", remainingLength=%" PRIu16,
		           pdu_type_to_str(*type, buffer, sizeof(buffer)), tpktLength ? *tpktLength : 0u,
		           remainingLength ? *remainingLength : 0u);
		return TRUE;
	}

	if (len < 4U)
	{
		WLog_Print(rdp->log, WLOG_ERROR,
		           "Invalid share control header, length is %" PRIu16 ", must be >4", len);
		return FALSE;
	}

	if (tpktLength)
		*tpktLength = len;

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 2))
		return FALSE;

	Stream_Read_UINT16(s, tmp); /* pduType */
	*type = tmp & 0x0F;         /* type is in the 4 least significant bits */

	size_t remLen = len - 4;
	if (len > 5)
	{
		if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 2))
			return FALSE;

		Stream_Read_UINT16(s, *channel_id); /* pduSource */
		remLen = len - 6;
	}
	else
		*channel_id = 0; /* Windows XP can send such short DEACTIVATE_ALL PDUs. */

	char buffer[128] = WINPR_C_ARRAY_INIT;
	WLog_Print(rdp->log, WLOG_DEBUG, "type=%s, tpktLength=%" PRIu16 ", remainingLength=%" PRIuz,
	           pdu_type_to_str(*type, buffer, sizeof(buffer)), len, remLen);
	if (remainingLength)
	{
		WINPR_ASSERT(remLen <= UINT16_MAX);
		*remainingLength = (UINT16)remLen;
	}
	return Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, remLen);
}

BOOL rdp_write_share_control_header(rdpRdp* rdp, wStream* s, size_t length, UINT16 type,
                                    UINT16 channel_id)
{
	WINPR_ASSERT(s);
	WINPR_ASSERT(rdp);
	if (length > UINT16_MAX)
		return FALSE;

	if (length < RDP_PACKET_HEADER_MAX_LENGTH)
		return FALSE;
	if (!Stream_CheckAndLogRequiredCapacityWLog(rdp->log, (s), 6))
		return FALSE;
	length -= RDP_PACKET_HEADER_MAX_LENGTH;
	/* Share Control Header */
	Stream_Write_UINT16(s, WINPR_ASSERTING_INT_CAST(uint16_t, length));      /* totalLength */
	Stream_Write_UINT16(s, WINPR_ASSERTING_INT_CAST(uint16_t, type | 0x10)); /* pduType */
	Stream_Write_UINT16(s, WINPR_ASSERTING_INT_CAST(uint16_t, channel_id));  /* pduSource */
	return TRUE;
}

BOOL rdp_read_share_data_header(rdpRdp* rdp, wStream* s, UINT16* length, BYTE* type,
                                UINT32* shareId, BYTE* compressedType, UINT16* compressedLength)
{
	WINPR_ASSERT(s);
	WINPR_ASSERT(rdp);

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 12))
		return FALSE;

	/* Share Data Header */
	Stream_Read_UINT32(s, *shareId);          /* shareId (4 bytes) */
	Stream_Seek_UINT8(s);                     /* pad1 (1 byte) */
	Stream_Seek_UINT8(s);                     /* streamId (1 byte) */
	Stream_Read_UINT16(s, *length);           /* uncompressedLength (2 bytes) */
	Stream_Read_UINT8(s, *type);              /* pduType2, Data PDU Type (1 byte) */
	Stream_Read_UINT8(s, *compressedType);    /* compressedType (1 byte) */
	Stream_Read_UINT16(s, *compressedLength); /* compressedLength (2 bytes) */
	return TRUE;
}

BOOL rdp_write_share_data_header(rdpRdp* rdp, wStream* s, size_t length, BYTE type, UINT32 share_id)
{
	const size_t headerLen = RDP_PACKET_HEADER_MAX_LENGTH + RDP_SHARE_CONTROL_HEADER_LENGTH +
	                         RDP_SHARE_DATA_HEADER_LENGTH;

	WINPR_ASSERT(s);
	WINPR_ASSERT(rdp);
	if (length > UINT16_MAX)
		return FALSE;

	if (length < headerLen)
		return FALSE;
	length -= headerLen;
	if (!Stream_CheckAndLogRequiredCapacityWLog(rdp->log, (s), 12))
		return FALSE;

	/* Share Data Header */
	Stream_Write_UINT32(s, share_id);  /* shareId (4 bytes) */
	Stream_Write_UINT8(s, 0);          /* pad1 (1 byte) */
	Stream_Write_UINT8(s, STREAM_LOW); /* streamId (1 byte) */
	Stream_Write_UINT16(
	    s, WINPR_ASSERTING_INT_CAST(uint16_t, length)); /* uncompressedLength (2 bytes) */
	Stream_Write_UINT8(s, type);                        /* pduType2, Data PDU Type (1 byte) */
	Stream_Write_UINT8(s, 0);                           /* compressedType (1 byte) */
	Stream_Write_UINT16(s, 0);                          /* compressedLength (2 bytes) */
	return TRUE;
}

static BOOL rdp_security_stream_init(rdpRdp* rdp, wStream* s, BOOL sec_header, UINT16* sec_flags)
{
	WINPR_ASSERT(rdp);
	WINPR_ASSERT(s);
	WINPR_ASSERT(sec_flags);

	if (rdp->do_crypt)
	{
		if (!Stream_SafeSeek(s, 12))
			return FALSE;

		if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
		{
			if (!Stream_SafeSeek(s, 4))
				return FALSE;
		}

		*sec_flags |= SEC_ENCRYPT;

		if (rdp->do_secure_checksum)
			*sec_flags |= SEC_SECURE_CHECKSUM;
	}
	else if (*sec_flags != 0 || sec_header)
	{
		if (!Stream_SafeSeek(s, 4))
			return FALSE;
	}

	return TRUE;
}

wStream* rdp_send_stream_init(rdpRdp* rdp, UINT16* sec_flags)
{
	wStream* s = nullptr;

	WINPR_ASSERT(rdp);
	WINPR_ASSERT(rdp->transport);

	s = transport_send_stream_init(rdp->transport, 4096);

	if (!s)
		return nullptr;

	if (!Stream_SafeSeek(s, RDP_PACKET_HEADER_MAX_LENGTH))
		goto fail;

	if (!rdp_security_stream_init(rdp, s, FALSE, sec_flags))
		goto fail;

	return s;
fail:
	Stream_Release(s);
	return nullptr;
}

wStream* rdp_send_stream_pdu_init(rdpRdp* rdp, UINT16* sec_flags)
{
	wStream* s = rdp_send_stream_init(rdp, sec_flags);

	if (!s)
		return nullptr;

	if (!Stream_SafeSeek(s, RDP_SHARE_CONTROL_HEADER_LENGTH))
		goto fail;

	return s;
fail:
	Stream_Release(s);
	return nullptr;
}

wStream* rdp_data_pdu_init(rdpRdp* rdp, UINT16* sec_flags)
{
	wStream* s = rdp_send_stream_pdu_init(rdp, sec_flags);

	if (!s)
		return nullptr;

	if (!Stream_SafeSeek(s, RDP_SHARE_DATA_HEADER_LENGTH))
		goto fail;

	return s;
fail:
	Stream_Release(s);
	return nullptr;
}

BOOL rdp_set_error_info(rdpRdp* rdp, UINT32 errorInfo)
{
	BOOL rc = TRUE;
	WINPR_ASSERT(rdp);

	rdp->errorInfo = errorInfo;

	if (rdp->errorInfo != ERRINFO_SUCCESS)
	{
		rdpContext* context = rdp->context;
		WINPR_ASSERT(context);

		rdp_print_errinfo(rdp->errorInfo);

		if (context)
		{
			freerdp_set_last_error_log(context, MAKE_FREERDP_ERROR(ERRINFO, errorInfo));

			if (context->pubSub)
			{
				ErrorInfoEventArgs e = WINPR_C_ARRAY_INIT;
				EventArgsInit(&e, "freerdp");
				e.code = rdp->errorInfo;
				rc = PubSub_OnErrorInfo(context->pubSub, context, &e) >= 0;
			}
		}
		else
			WLog_Print(rdp->log, WLOG_ERROR, "missing context=%p", (void*)context);
	}
	else
	{
		freerdp_set_last_error_log(rdp->context, FREERDP_ERROR_SUCCESS);
	}

	return rc;
}

wStream* rdp_message_channel_pdu_init(rdpRdp* rdp, UINT16* sec_flags)
{
	wStream* s = nullptr;

	WINPR_ASSERT(rdp);

	s = transport_send_stream_init(rdp->transport, 4096);

	if (!s)
		return nullptr;

	if (!Stream_SafeSeek(s, RDP_PACKET_HEADER_MAX_LENGTH))
		goto fail;

	if (!rdp_security_stream_init(rdp, s, TRUE, sec_flags))
		goto fail;

	return s;
fail:
	Stream_Release(s);
	return nullptr;
}

/**
 * Read an RDP packet header.
 * @param rdp rdp module
 * @param s stream
 * @param length RDP packet length
 * @param channelId channel id
 *
 * @return \b TRUE for success, \b FALSE otherwise
 */

BOOL rdp_read_header(rdpRdp* rdp, wStream* s, UINT16* length, UINT16* channelId)
{
	BYTE li = 0;
	BYTE code = 0;
	BYTE choice = 0;
	UINT16 initiator = 0;

	WINPR_ASSERT(rdp);
	WINPR_ASSERT(rdp->settings);
	WINPR_ASSERT(s);
	DomainMCSPDU MCSPDU = (rdp->settings->ServerMode) ? DomainMCSPDU_SendDataRequest
	                                                  : DomainMCSPDU_SendDataIndication;

	*channelId = 0; /* Initialize in case of early abort */
	if (!tpkt_read_header(s, length))
		return FALSE;

	if (!tpdu_read_header(s, &code, &li, *length))
		return FALSE;

	if (code != X224_TPDU_DATA)
	{
		if (code == X224_TPDU_DISCONNECT_REQUEST)
		{
			WLog_Print(rdp->log, WLOG_WARN, "Received X224_TPDU_DISCONNECT_REQUEST, terminating");
			utils_abort_connect(rdp);
			return TRUE;
		}

		WLog_Print(rdp->log, WLOG_WARN,
		           "Unexpected X224 TPDU type %s [%08" PRIx32 "] instead of %s",
		           tpdu_type_to_string(code), code, tpdu_type_to_string(X224_TPDU_DATA));
		return FALSE;
	}

	if (!per_read_choice(s, &choice))
		return FALSE;

	const DomainMCSPDU domainMCSPDU = (DomainMCSPDU)(choice >> 2);

	if (domainMCSPDU != MCSPDU)
	{
		if (domainMCSPDU != DomainMCSPDU_DisconnectProviderUltimatum)
		{
			WLog_Print(rdp->log, WLOG_WARN, "Received %s instead of %s",
			           mcs_domain_pdu_string(domainMCSPDU), mcs_domain_pdu_string(MCSPDU));
			return FALSE;
		}
	}

	MCSPDU = domainMCSPDU;

	if (*length < 8U)
	{
		WLog_Print(rdp->log, WLOG_WARN, "TPDU invalid length, got %" PRIu16 ", expected at least 8",
		           *length);
		return FALSE;
	}

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, *length - 8))
		return FALSE;

	if (MCSPDU == DomainMCSPDU_DisconnectProviderUltimatum)
	{
		int reason = 0;
		TerminateEventArgs e = WINPR_C_ARRAY_INIT;

		if (!mcs_recv_disconnect_provider_ultimatum(rdp->mcs, s, &reason))
			return FALSE;

		rdpContext* context = rdp->context;
		WINPR_ASSERT(context);
		context->disconnectUltimatum = reason;

		if (rdp->errorInfo == ERRINFO_SUCCESS)
		{
			/**
			 * Some servers like Windows Server 2008 R2 do not send the error info pdu
			 * when the user logs off like they should. Map DisconnectProviderUltimatum
			 * to a ERRINFO_LOGOFF_BY_USER when the errinfo code is ERRINFO_SUCCESS.
			 */
			UINT32 errorInfo = ERRINFO_RPC_INITIATED_DISCONNECT;
			if (reason == Disconnect_Ultimatum_provider_initiated)
				errorInfo = ERRINFO_RPC_INITIATED_DISCONNECT;
			else if (reason == Disconnect_Ultimatum_user_requested)
				errorInfo = ERRINFO_LOGOFF_BY_USER;

			if (!rdp_set_error_info(rdp, errorInfo))
				return FALSE;
		}

		WLog_Print(rdp->log, WLOG_DEBUG, "DisconnectProviderUltimatum: reason: %d", reason);
		utils_abort_connect(rdp);
		EventArgsInit(&e, "freerdp");
		e.code = 0;
		return PubSub_OnTerminate(rdp->pubSub, context, &e) >= 0;
	}

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 5))
		return FALSE;

	if (!per_read_integer16(s, &initiator, MCS_BASE_CHANNEL_ID)) /* initiator (UserId) */
		return FALSE;

	if (!per_read_integer16(s, channelId, 0)) /* channelId */
		return FALSE;

	const uint8_t dataPriority = Stream_Get_UINT8(s); /* dataPriority + Segmentation (0x70) */
	WLog_Print(rdp->log, WLOG_TRACE, "dataPriority=%" PRIu8, dataPriority);

	if (!per_read_length(s, length)) /* userData (OCTET_STRING) */
		return FALSE;

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, *length))
		return FALSE;

	return TRUE;
}

/**
 * Write an RDP packet header.
 * @param rdp rdp module
 * @param s stream
 * @param length RDP packet length
 * @param channelId channel id
 *
 * @return \b TRUE for success, \b FALSE otherwise
 */

BOOL rdp_write_header(rdpRdp* rdp, wStream* s, size_t length, UINT16 channelId, UINT16 sec_flags)
{
	WINPR_ASSERT(rdp);
	WINPR_ASSERT(rdp->settings);
	WINPR_ASSERT(s);
	WINPR_ASSERT(length >= RDP_PACKET_HEADER_MAX_LENGTH);
	if (length > UINT16_MAX)
		return FALSE;

	DomainMCSPDU MCSPDU = (rdp->settings->ServerMode) ? DomainMCSPDU_SendDataIndication
	                                                  : DomainMCSPDU_SendDataRequest;

	if ((sec_flags & SEC_ENCRYPT) && (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS))
	{
		const UINT16 body_length = (UINT16)length - RDP_PACKET_HEADER_MAX_LENGTH;
		const UINT16 pad = 8 - (body_length % 8);

		if (pad != 8)
			length += pad;
	}

	if (!mcs_write_domain_mcspdu_header(s, MCSPDU, (UINT16)length, 0))
		return FALSE;
	if (!per_write_integer16(s, rdp->mcs->userId, MCS_BASE_CHANNEL_ID)) /* initiator */
		return FALSE;
	if (!per_write_integer16(s, channelId, 0)) /* channelId */
		return FALSE;
	if (!Stream_EnsureRemainingCapacity(s, 3))
		return FALSE;
	Stream_Write_UINT8(s, 0x70); /* dataPriority + segmentation */
	/*
	 * We always encode length in two bytes, even though we could use
	 * only one byte if length <= 0x7F. It is just easier that way,
	 * because we can leave room for fixed-length header, store all
	 * the data first and then store the header.
	 */
	length = (length - RDP_PACKET_HEADER_MAX_LENGTH) | 0x8000;
	Stream_Write_UINT16_BE(
	    s, WINPR_ASSERTING_INT_CAST(uint16_t, length)); /* userData (OCTET_STRING) */
	return TRUE;
}

static BOOL rdp_security_stream_out(rdpRdp* rdp, wStream* s, size_t length, UINT16 sec_flags,
                                    UINT32* pad)
{
	BOOL status = 0;
	WINPR_ASSERT(rdp);
	if (length > UINT16_MAX)
		return FALSE;

	*pad = 0;

	if (sec_flags != 0)
	{
		WINPR_ASSERT(sec_flags <= UINT16_MAX);
		if (!rdp_write_security_header(rdp, s, sec_flags))
			return FALSE;

		if (sec_flags & SEC_ENCRYPT)
		{
			if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
			{
				BYTE* data = Stream_PointerAs(s, BYTE) + 12;
				const size_t size = WINPR_ASSERTING_INT_CAST(size_t, (data - Stream_Buffer(s)));
				if (size > length)
					return FALSE;

				length -= size;

				Stream_Write_UINT16(s, 0x10); /* length */
				Stream_Write_UINT8(s, 0x1);   /* TSFIPS_VERSION 1*/
				/* handle padding */
				*pad = 8 - (length % 8);

				if (*pad == 8)
					*pad = 0;

				if (*pad)
					memset(data + length, 0, *pad);

				Stream_Write_UINT8(s, WINPR_ASSERTING_INT_CAST(uint8_t, *pad));

				if (!Stream_CheckAndLogRequiredCapacityWLog(rdp->log, s, 8))
					return FALSE;
				if (!security_hmac_signature(data, length, Stream_Pointer(s), 8, rdp))
					return FALSE;

				Stream_Seek(s, 8);
				if (!security_fips_encrypt(data, length + *pad, rdp))
					return FALSE;
			}
			else
			{
				const BYTE* data = Stream_PointerAs(s, const BYTE) + 8;
				const size_t diff = Stream_GetPosition(s) + 8ULL;
				if (diff > length)
					return FALSE;
				length -= diff;

				if (!Stream_CheckAndLogRequiredCapacityWLog(rdp->log, s, 8))
					return FALSE;
				if (sec_flags & SEC_SECURE_CHECKSUM)
					status = security_salted_mac_signature(rdp, data, (UINT32)length, TRUE,
					                                       Stream_Pointer(s), 8);
				else
					status = security_mac_signature(rdp, data, (UINT32)length,
					                                Stream_PointerAs(s, BYTE), 8);

				if (!status)
					return FALSE;

				Stream_Seek(s, 8);

				if (!security_encrypt(Stream_Pointer(s), length, rdp))
					return FALSE;
			}
		}
	}

	return TRUE;
}

static UINT32 rdp_get_sec_bytes(rdpRdp* rdp, UINT16 sec_flags)
{
	UINT32 sec_bytes = 0;

	if (sec_flags & SEC_ENCRYPT)
	{
		sec_bytes = 12;

		if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
			sec_bytes += 4;
	}
	else if (sec_flags != 0)
	{
		sec_bytes = 4;
	}
	else
	{
		sec_bytes = 0;
	}

	return sec_bytes;
}

BOOL rdp_send(rdpRdp* rdp, wStream* s, UINT16 channelId, UINT16 sec_flags)
{
	BOOL rc = FALSE;
	UINT32 pad = 0;
	BOOL should_unlock = FALSE;

	if (!s)
		return FALSE;

	if (!rdp)
		goto fail;

	if (sec_flags & SEC_ENCRYPT)
	{
		security_lock(rdp);
		should_unlock = TRUE;
	}

	{
		size_t length = Stream_GetPosition(s);
		Stream_ResetPosition(s);
		if (!rdp_write_header(rdp, s, length, channelId, sec_flags))
			goto fail;

		if (!rdp_security_stream_out(rdp, s, length, sec_flags, &pad))
			goto fail;

		length += pad;
		if (!Stream_SetPosition(s, length))
			goto fail;
		Stream_SealLength(s);
	}

	if (transport_write(rdp->transport, s) < 0)
		goto fail;

	rc = TRUE;
fail:
	if (should_unlock)
		security_unlock(rdp);
	Stream_Release(s);
	return rc;
}

BOOL rdp_send_pdu(rdpRdp* rdp, wStream* s, UINT16 type, UINT16 channel_id, UINT16 sec_flags)
{
	BOOL rc = FALSE;
	UINT32 sec_bytes = 0;
	size_t sec_hold = 0;
	UINT32 pad = 0;
	BOOL should_unlock = FALSE;

	if (!s)
		return FALSE;

	if (!rdp)
		goto fail;

	if (sec_flags & SEC_ENCRYPT)
	{
		security_lock(rdp);
		should_unlock = TRUE;
	}

	{
		size_t length = Stream_GetPosition(s);
		Stream_ResetPosition(s);
		if (!rdp_write_header(rdp, s, length, MCS_GLOBAL_CHANNEL_ID, sec_flags))
			goto fail;
		sec_bytes = rdp_get_sec_bytes(rdp, sec_flags);
		sec_hold = Stream_GetPosition(s);
		Stream_Seek(s, sec_bytes);
		if (!rdp_write_share_control_header(rdp, s, length - sec_bytes, type, channel_id))
			goto fail;
		if (!Stream_SetPosition(s, sec_hold))
			goto fail;

		if (!rdp_security_stream_out(rdp, s, length, sec_flags, &pad))
			goto fail;

		length += pad;
		if (!Stream_SetPosition(s, length))
			goto fail;
		Stream_SealLength(s);
	}

	if (transport_write(rdp->transport, s) < 0)
		goto fail;

	rc = TRUE;
fail:
	if (should_unlock)
		security_unlock(rdp);
	return rc;
}

BOOL rdp_send_data_pdu(rdpRdp* rdp, wStream* s, BYTE type, UINT16 channel_id, UINT16 sec_flags)
{
	BOOL rc = FALSE;
	UINT32 sec_bytes = 0;
	size_t sec_hold = 0;
	UINT32 pad = 0;
	BOOL should_unlock = FALSE;

	if (!s)
		return FALSE;

	if (!rdp)
		goto fail;

	if (sec_flags & SEC_ENCRYPT)
	{
		security_lock(rdp);
		should_unlock = TRUE;
	}

	{
		size_t length = Stream_GetPosition(s);
		Stream_ResetPosition(s);
		if (!rdp_write_header(rdp, s, length, MCS_GLOBAL_CHANNEL_ID, sec_flags))
			goto fail;
		sec_bytes = rdp_get_sec_bytes(rdp, sec_flags);
		sec_hold = Stream_GetPosition(s);
		Stream_Seek(s, sec_bytes);
		if (!rdp_write_share_control_header(rdp, s, length - sec_bytes, PDU_TYPE_DATA, channel_id))
			goto fail;
		if (!rdp_write_share_data_header(rdp, s, length - sec_bytes, type, rdp->settings->ShareId))
			goto fail;
		if (!Stream_SetPosition(s, sec_hold))
			goto fail;

		if (!rdp_security_stream_out(rdp, s, length, sec_flags, &pad))
			goto fail;

		length += pad;
		if (!Stream_SetPosition(s, length))
			goto fail;
		Stream_SealLength(s);
	}
	WLog_Print(rdp->log, WLOG_DEBUG,
	           "sending data (type=0x%x size=%" PRIuz " channelId=%" PRIu16 ")", type,
	           Stream_Length(s), channel_id);

	rdp->outPackets++;
	if (transport_write(rdp->transport, s) < 0)
		goto fail;

	rc = TRUE;
fail:
	if (should_unlock)
		security_unlock(rdp);
	Stream_Release(s);
	return rc;
}

BOOL rdp_send_message_channel_pdu(rdpRdp* rdp, wStream* s, UINT16 sec_flags)
{
	BOOL rc = FALSE;
	UINT32 pad = 0;
	BOOL should_unlock = FALSE;

	WINPR_ASSERT(rdp);
	WINPR_ASSERT(s);

	if (sec_flags & SEC_ENCRYPT)
	{
		security_lock(rdp);
		should_unlock = TRUE;
	}

	{
		size_t length = Stream_GetPosition(s);
		Stream_ResetPosition(s);
		if (!rdp_write_header(rdp, s, length, rdp->mcs->messageChannelId, sec_flags))
			goto fail;

		if (!rdp_security_stream_out(rdp, s, length, sec_flags, &pad))
			goto fail;

		length += pad;
		if (!Stream_SetPosition(s, length))
			goto fail;
	}
	Stream_SealLength(s);

	if (transport_write(rdp->transport, s) < 0)
		goto fail;

	rc = TRUE;
fail:
	if (should_unlock)
		security_unlock(rdp);

	Stream_Release(s);
	return rc;
}

static BOOL rdp_recv_server_shutdown_denied_pdu(WINPR_ATTR_UNUSED rdpRdp* rdp,
                                                WINPR_ATTR_UNUSED wStream* s)
{
	return TRUE;
}

static BOOL rdp_recv_server_set_keyboard_indicators_pdu(rdpRdp* rdp, wStream* s)
{
	WINPR_ASSERT(rdp);
	WINPR_ASSERT(s);

	rdpContext* context = rdp->context;
	WINPR_ASSERT(context);
	WINPR_ASSERT(context->update);

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 4))
		return FALSE;

	const uint16_t unitId = Stream_Get_UINT16(s); /* unitId (2 bytes) */
	if (unitId != 0)
	{
		WLog_Print(rdp->log, WLOG_WARN,
		           "[MS-RDPBCGR] 2.2.8.2.1.1 Set Keyboard Indicators PDU Data "
		           "(TS_SET_KEYBOARD_INDICATORS_PDU)::unitId should be 0, is %" PRIu16,
		           unitId);
	}
	const UINT16 ledFlags = Stream_Get_UINT16(s); /* ledFlags (2 bytes) */
	return IFCALLRESULT(TRUE, context->update->SetKeyboardIndicators, context, ledFlags);
}

static BOOL rdp_recv_server_set_keyboard_ime_status_pdu(rdpRdp* rdp, wStream* s)
{
	if (!rdp || !rdp->input)
		return FALSE;

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 10))
		return FALSE;

	const uint16_t unitId = Stream_Get_UINT16(s); /* unitId (2 bytes) */
	if (unitId != 0)
	{
		WLog_Print(rdp->log, WLOG_WARN,
		           "[MS-RDPBCGR] 2.2.8.2.2.1 Set Keyboard IME Status PDU Data "
		           "(TS_SET_KEYBOARD_IME_STATUS_PDU)::unitId should be 0, is %" PRIu16,
		           unitId);
	}
	const uint32_t imeState = Stream_Get_UINT32(s);    /* imeState (4 bytes) */
	const uint32_t imeConvMode = Stream_Get_UINT32(s); /* imeConvMode (4 bytes) */
	return IFCALLRESULT(TRUE, rdp->update->SetKeyboardImeStatus, rdp->context, unitId, imeState,
	                    imeConvMode);
}

static BOOL rdp_recv_set_error_info_data_pdu(rdpRdp* rdp, wStream* s)
{
	UINT32 errorInfo = 0;

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 4))
		return FALSE;

	Stream_Read_UINT32(s, errorInfo); /* errorInfo (4 bytes) */
	return rdp_set_error_info(rdp, errorInfo);
}

static BOOL rdp_recv_server_auto_reconnect_status_pdu(rdpRdp* rdp, wStream* s)
{
	UINT32 arcStatus = 0;

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 4))
		return FALSE;

	Stream_Read_UINT32(s, arcStatus); /* arcStatus (4 bytes) */
	WLog_Print(rdp->log, WLOG_WARN, "AutoReconnectStatus: 0x%08" PRIX32 "", arcStatus);
	return TRUE;
}

static BOOL rdp_recv_server_status_info_pdu(rdpRdp* rdp, wStream* s)
{
	UINT32 statusCode = 0;

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 4))
		return FALSE;

	Stream_Read_UINT32(s, statusCode); /* statusCode (4 bytes) */

	if (rdp->update->ServerStatusInfo)
		return rdp->update->ServerStatusInfo(rdp->context, statusCode);

	return TRUE;
}

static void log_monitor(size_t idx, const MONITOR_DEF* monitor, wLog* log, DWORD level)
{
	WINPR_ASSERT(monitor);

	WLog_Print(log, level, "[%" PRIuz "] {%dx%d-%dx%d} [0x%08" PRIx32 "]", idx, monitor->left,
	           monitor->top, monitor->right, monitor->bottom, monitor->flags);
}

static void log_monitor_configuration(wLog* log, const MONITOR_DEF* monitors, size_t count)
{
	const DWORD level = WLOG_DEBUG;
	WLog_Print(log, level, "[BEGIN] RemoteMonitors[%" PRIuz "]", count);
	for (size_t x = 0; x < count; x++)
	{
		const MONITOR_DEF* monitor = &monitors[x];
		log_monitor(x, monitor, log, level);
	}
	WLog_Print(log, level, "[END] RemoteMonitors[%" PRIuz "]", count);
}

static BOOL rdp_recv_monitor_layout_pdu(rdpRdp* rdp, wStream* s)
{
	BOOL ret = TRUE;

	WINPR_ASSERT(rdp);
	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 4))
		return FALSE;

	const UINT32 monitorCount = Stream_Get_UINT32(s); /* monitorCount (4 bytes) */

	if (!Stream_CheckAndLogRequiredLengthOfSizeWLog(rdp->log, s, monitorCount, 20ull))
		return FALSE;

	MONITOR_DEF* monitorDefArray = (MONITOR_DEF*)calloc(monitorCount, sizeof(MONITOR_DEF));

	if (!monitorDefArray)
		return FALSE;

	for (UINT32 index = 0; index < monitorCount; index++)
	{
		MONITOR_DEF* monitor = &monitorDefArray[index];
		Stream_Read_INT32(s, monitor->left);   /* left (4 bytes) */
		Stream_Read_INT32(s, monitor->top);    /* top (4 bytes) */
		Stream_Read_INT32(s, monitor->right);  /* right (4 bytes) */
		Stream_Read_INT32(s, monitor->bottom); /* bottom (4 bytes) */
		Stream_Read_UINT32(s, monitor->flags); /* flags (4 bytes) */
	}

	log_monitor_configuration(rdp->log, monitorDefArray, monitorCount);
	IFCALLRET(rdp->update->RemoteMonitors, ret, rdp->context, monitorCount, monitorDefArray);
	free(monitorDefArray);
	if (!ret)
		return FALSE;
	return rdp_set_monitor_layout_pdu_state(rdp, TRUE);
}

state_run_t rdp_recv_data_pdu(rdpRdp* rdp, wStream* s)
{
	BYTE type = 0;
	wStream* cs = nullptr;
	UINT16 length = 0;
	UINT32 shareId = 0;
	BYTE compressedType = 0;
	UINT16 compressedLength = 0;

	WINPR_ASSERT(rdp);
	if (!rdp_read_share_data_header(rdp, s, &length, &type, &shareId, &compressedType,
	                                &compressedLength))
	{
		WLog_Print(rdp->log, WLOG_ERROR, "rdp_read_share_data_header() failed");
		return STATE_RUN_FAILED;
	}

	cs = s;

	if (compressedType & PACKET_COMPRESSED)
	{
		if (compressedLength < 18)
		{
			WLog_Print(rdp->log, WLOG_ERROR,
			           "bulk_decompress: not enough bytes for compressedLength %" PRIu16 "",
			           compressedLength);
			return STATE_RUN_FAILED;
		}

		UINT32 DstSize = 0;
		const BYTE* pDstData = nullptr;
		UINT16 SrcSize = compressedLength - 18;

		if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, SrcSize))
		{
			WLog_Print(rdp->log, WLOG_ERROR,
			           "bulk_decompress: not enough bytes for compressedLength %" PRIu16 "",
			           compressedLength);
			return STATE_RUN_FAILED;
		}

		if (bulk_decompress(rdp->bulk, Stream_ConstPointer(s), SrcSize, &pDstData, &DstSize,
		                    compressedType))
		{
			cs = transport_take_from_pool(rdp->transport, DstSize);
			if (!cs)
			{
				WLog_Print(rdp->log, WLOG_ERROR, "Couldn't take stream from pool");
				return STATE_RUN_FAILED;
			}

			Stream_ResetPosition(cs);
			Stream_Write(cs, pDstData, DstSize);
			Stream_SealLength(cs);
			Stream_ResetPosition(cs);
		}
		else
		{
			WLog_Print(rdp->log, WLOG_ERROR, "bulk_decompress() failed");
			return STATE_RUN_FAILED;
		}

		Stream_Seek(s, SrcSize);
	}

	WLog_Print(rdp->log, WLOG_DEBUG, "recv %s Data PDU (0x%02" PRIX8 "), length: %" PRIu16 "",
	           data_pdu_type_to_string(type), type, length);

	switch (type)
	{
		case DATA_PDU_TYPE_UPDATE:
			if (!update_recv(rdp->update, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR, "DATA_PDU_TYPE_UPDATE - update_recv() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_CONTROL:
			if (!rdp_recv_server_control_pdu(rdp, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_CONTROL - rdp_recv_server_control_pdu() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_POINTER:
			if (!update_recv_pointer(rdp->update, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_POINTER - update_recv_pointer() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_SYNCHRONIZE:
			if (!rdp_recv_server_synchronize_pdu(rdp, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_SYNCHRONIZE - rdp_recv_synchronize_pdu() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_PLAY_SOUND:
			if (!update_recv_play_sound(rdp->update, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_PLAY_SOUND - update_recv_play_sound() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_SHUTDOWN_DENIED:
			if (!rdp_recv_server_shutdown_denied_pdu(rdp, cs))
			{
				WLog_Print(
				    rdp->log, WLOG_ERROR,
				    "DATA_PDU_TYPE_SHUTDOWN_DENIED - rdp_recv_server_shutdown_denied_pdu() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_SAVE_SESSION_INFO:
			if (!rdp_recv_save_session_info(rdp, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_SAVE_SESSION_INFO - rdp_recv_save_session_info() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_FONT_MAP:
			if (!rdp_recv_font_map_pdu(rdp, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_FONT_MAP - rdp_recv_font_map_pdu() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_SET_KEYBOARD_INDICATORS:
			if (!rdp_recv_server_set_keyboard_indicators_pdu(rdp, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_SET_KEYBOARD_INDICATORS - "
				           "rdp_recv_server_set_keyboard_indicators_pdu() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_SET_KEYBOARD_IME_STATUS:
			if (!rdp_recv_server_set_keyboard_ime_status_pdu(rdp, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_SET_KEYBOARD_IME_STATUS - "
				           "rdp_recv_server_set_keyboard_ime_status_pdu() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_SET_ERROR_INFO:
			if (!rdp_recv_set_error_info_data_pdu(rdp, cs))
			{
				WLog_Print(
				    rdp->log, WLOG_ERROR,
				    "DATA_PDU_TYPE_SET_ERROR_INFO - rdp_recv_set_error_info_data_pdu() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_ARC_STATUS:
			if (!rdp_recv_server_auto_reconnect_status_pdu(rdp, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_ARC_STATUS - "
				           "rdp_recv_server_auto_reconnect_status_pdu() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_STATUS_INFO:
			if (!rdp_recv_server_status_info_pdu(rdp, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_STATUS_INFO - rdp_recv_server_status_info_pdu() failed");
				goto out_fail;
			}

			break;

		case DATA_PDU_TYPE_MONITOR_LAYOUT:
			if (!rdp_recv_monitor_layout_pdu(rdp, cs))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "DATA_PDU_TYPE_MONITOR_LAYOUT - rdp_recv_monitor_layout_pdu() failed");
				goto out_fail;
			}

			break;

		default:
			WLog_Print(rdp->log, WLOG_WARN,
			           "[UNHANDLED] %s Data PDU (0x%02" PRIX8 "), length: %" PRIu16 "",
			           data_pdu_type_to_string(type), type, length);
			break;
	}

	if (cs != s)
		Stream_Release(cs);

	return STATE_RUN_SUCCESS;
out_fail:

	if (cs != s)
		Stream_Release(cs);

	return STATE_RUN_FAILED;
}

state_run_t rdp_recv_message_channel_pdu(rdpRdp* rdp, wStream* s, UINT16 securityFlags)
{
	WINPR_ASSERT(rdp);
	WINPR_ASSERT(s);

	if (securityFlags & SEC_AUTODETECT_REQ)
	{
		/* Server Auto-Detect Request PDU */
		return autodetect_recv_request_packet(rdp->autodetect, RDP_TRANSPORT_TCP, s);
	}

	if (securityFlags & SEC_AUTODETECT_RSP)
	{
		/* Client Auto-Detect Response PDU */
		return autodetect_recv_response_packet(rdp->autodetect, RDP_TRANSPORT_TCP, s);
	}

	if (securityFlags & SEC_HEARTBEAT)
	{
		/* Heartbeat PDU */
		return rdp_recv_heartbeat_packet(rdp, s);
	}

	if (securityFlags & SEC_TRANSPORT_REQ)
	{
		return multitransport_recv_request(rdp->multitransport, s);
	}

	if (securityFlags & SEC_TRANSPORT_RSP)
	{
		return multitransport_recv_response(rdp->multitransport, s);
	}

	if (securityFlags & SEC_LICENSE_PKT)
	{
		return license_recv(rdp->license, s);
	}

	if (securityFlags & SEC_LICENSE_ENCRYPT_CS)
	{
		return license_recv(rdp->license, s);
	}

	if (securityFlags & SEC_LICENSE_ENCRYPT_SC)
	{
		return license_recv(rdp->license, s);
	}

	return STATE_RUN_SUCCESS;
}

state_run_t rdp_recv_out_of_sequence_pdu(rdpRdp* rdp, wStream* s, UINT16 pduType, UINT16 length)
{
	state_run_t rc = STATE_RUN_FAILED;
	WINPR_ASSERT(rdp);

	switch (pduType)
	{
		case PDU_TYPE_DATA:
			rc = rdp_recv_data_pdu(rdp, s);
			break;
		case PDU_TYPE_SERVER_REDIRECTION:
			rc = rdp_recv_enhanced_security_redirection_packet(rdp, s);
			break;
		case PDU_TYPE_FLOW_RESPONSE:
		case PDU_TYPE_FLOW_STOP:
		case PDU_TYPE_FLOW_TEST:
			rc = STATE_RUN_SUCCESS;
			break;
		default:
		{
			char buffer1[256] = WINPR_C_ARRAY_INIT;
			char buffer2[256] = WINPR_C_ARRAY_INIT;

			WLog_Print(rdp->log, WLOG_ERROR, "expected %s, got %s",
			           pdu_type_to_str(PDU_TYPE_DEMAND_ACTIVE, buffer1, sizeof(buffer1)),
			           pdu_type_to_str(pduType, buffer2, sizeof(buffer2)));
			rc = STATE_RUN_FAILED;
		}
		break;
	}

	if (!tpkt_ensure_stream_consumed(rdp->log, s, length))
		return STATE_RUN_FAILED;
	return rc;
}

BOOL rdp_read_flow_control_pdu(rdpRdp* rdp, wStream* s, UINT16* type, UINT16* channel_id)
{
	/*
	 * Read flow control PDU - documented in FlowPDU section in T.128
	 * http://www.itu.int/rec/T-REC-T.128-199802-S/en
	 * The specification for the PDU has pad8bits listed BEFORE pduTypeFlow.
	 * However, so far pad8bits has always been observed to arrive AFTER pduTypeFlow.
	 * Switched the order of these two fields to match this observation.
	 */
	UINT8 pduType = 0;

	WINPR_ASSERT(rdp);
	WINPR_ASSERT(s);
	WINPR_ASSERT(type);
	WINPR_ASSERT(channel_id);

	if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 6))
		return FALSE;
	Stream_Read_UINT8(s, pduType); /* pduTypeFlow */
	*type = pduType;
	Stream_Seek_UINT8(s);               /* pad8bits */
	Stream_Seek_UINT8(s);               /* flowIdentifier */
	Stream_Seek_UINT8(s);               /* flowNumber */
	Stream_Read_UINT16(s, *channel_id); /* pduSource */
	return TRUE;
}

/**
 * Decrypt an RDP packet.
 *
 * @param rdp RDP module
 * @param s stream
 * @param pLength A pointer to the result variable, must not be nullptr
 * @param securityFlags the security flags to apply
 *
 * @return \b TRUE for success, \b FALSE otherwise
 */

BOOL rdp_decrypt(rdpRdp* rdp, wStream* s, UINT16* pLength, UINT16 securityFlags)
{
	BOOL res = FALSE;
	BYTE cmac[8] = WINPR_C_ARRAY_INIT;
	BYTE wmac[8] = WINPR_C_ARRAY_INIT;
	BOOL status = FALSE;

	WINPR_ASSERT(rdp);
	WINPR_ASSERT(rdp->settings);
	WINPR_ASSERT(s);
	WINPR_ASSERT(pLength);

	security_lock(rdp);

	INT32 length = *pLength;
	if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_NONE)
	{
		res = TRUE;
		goto unlock;
	}

	if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
	{
		if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, 12))
			goto unlock;

		UINT16 len = 0;
		Stream_Read_UINT16(s, len); /* 0x10 */
		if (len != 0x10)
			WLog_Print(rdp->log, WLOG_WARN, "ENCRYPTION_METHOD_FIPS length %" PRIu16 " != 0x10",
			           len);

		UINT16 version = 0;
		Stream_Read_UINT8(s, version); /* 0x1 */
		if (version != 1)
			WLog_Print(rdp->log, WLOG_WARN, "ENCRYPTION_METHOD_FIPS version %" PRIu16 " != 1",
			           version);

		BYTE pad = 0;
		Stream_Read_UINT8(s, pad);
		const BYTE* sig = Stream_ConstPointer(s);
		Stream_Seek(s, 8); /* signature */
		length -= 12;
		const INT32 padLength = length - pad;

		if ((length <= 0) || (padLength <= 0) || (padLength > UINT16_MAX))
		{
			WLog_Print(rdp->log, WLOG_ERROR, "FATAL: invalid pad length %" PRId32, padLength);
			goto unlock;
		}

		if (!security_fips_decrypt(Stream_Pointer(s), (size_t)length, rdp))
			goto unlock;

		if (!security_fips_check_signature(Stream_ConstPointer(s), (size_t)padLength, sig, 8, rdp))
			goto unlock;

		if (!Stream_SetLength(s, Stream_Length(s) - pad))
			goto unlock;

		*pLength = (UINT16)padLength;
	}
	else
	{
		if (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, sizeof(wmac)))
			goto unlock;

		Stream_Read(s, wmac, sizeof(wmac));
		length -= sizeof(wmac);

		if (length <= 0)
		{
			WLog_Print(rdp->log, WLOG_ERROR, "FATAL: invalid length field");
			goto unlock;
		}

		if (!security_decrypt(Stream_PointerAs(s, BYTE), (size_t)length, rdp))
			goto unlock;

		if (securityFlags & SEC_SECURE_CHECKSUM)
			status = security_salted_mac_signature(rdp, Stream_ConstPointer(s), (UINT32)length,
			                                       FALSE, cmac, sizeof(cmac));
		else
			status = security_mac_signature(rdp, Stream_ConstPointer(s), (UINT32)length, cmac,
			                                sizeof(cmac));

		if (!status)
			goto unlock;

		if (memcmp(wmac, cmac, sizeof(wmac)) != 0)
		{
			WLog_Print(rdp->log, WLOG_ERROR, "WARNING: invalid packet signature");
			/*
			 * Because Standard RDP Security is totally broken,
			 * and cannot protect against MITM, don't treat signature
			 * verification failure as critical. This at least enables
			 * us to work with broken RDP clients and servers that
			 * generate invalid signatures.
			 */
			// return FALSE;
		}

		*pLength = (UINT16)length;
	}
	res = TRUE;
unlock:
	security_unlock(rdp);
	return res;
}

const char* pdu_type_to_str(UINT16 pduType, char* buffer, size_t length)
{
	const char* str = nullptr;
	switch (pduType)
	{
		case PDU_TYPE_DEMAND_ACTIVE:
			str = "PDU_TYPE_DEMAND_ACTIVE";
			break;
		case PDU_TYPE_CONFIRM_ACTIVE:
			str = "PDU_TYPE_CONFIRM_ACTIVE";
			break;
		case PDU_TYPE_DEACTIVATE_ALL:
			str = "PDU_TYPE_DEACTIVATE_ALL";
			break;
		case PDU_TYPE_DATA:
			str = "PDU_TYPE_DATA";
			break;
		case PDU_TYPE_SERVER_REDIRECTION:
			str = "PDU_TYPE_SERVER_REDIRECTION";
			break;
		case PDU_TYPE_FLOW_TEST:
			str = "PDU_TYPE_FLOW_TEST";
			break;
		case PDU_TYPE_FLOW_RESPONSE:
			str = "PDU_TYPE_FLOW_RESPONSE";
			break;
		case PDU_TYPE_FLOW_STOP:
			str = "PDU_TYPE_FLOW_STOP";
			break;
		default:
			str = "PDU_TYPE_UNKNOWN";
			break;
	}

	winpr_str_append(str, buffer, length, "");
	{
		char msg[32] = WINPR_C_ARRAY_INIT;
		(void)_snprintf(msg, sizeof(msg), "[0x%08" PRIx32 "]", pduType);
		winpr_str_append(msg, buffer, length, "");
	}
	return buffer;
}

/**
 * Process an RDP packet.
 * @param rdp RDP module
 * @param s stream
 */

static state_run_t rdp_recv_tpkt_pdu(rdpRdp* rdp, wStream* s)
{
	state_run_t rc = STATE_RUN_SUCCESS;
	UINT16 length = 0;
	UINT16 pduType = 0;
	UINT16 pduSource = 0;
	UINT16 channelId = 0;
	UINT16 securityFlags = 0;

	WINPR_ASSERT(rdp);
	WINPR_ASSERT(rdp->context);
	WINPR_ASSERT(s);

	freerdp* instance = rdp->context->instance;
	WINPR_ASSERT(instance);

	if (!rdp_read_header(rdp, s, &length, &channelId))
		return STATE_RUN_FAILED;

	if (freerdp_shall_disconnect_context(rdp->context))
		return STATE_RUN_SUCCESS;

	if (rdp->autodetect->bandwidthMeasureStarted)
	{
		rdp->autodetect->bandwidthMeasureByteCount += length;
	}

	if (rdp->mcs->messageChannelId && (channelId == rdp->mcs->messageChannelId))
	{
		rdp->inPackets++;
		return rdp_handle_message_channel(rdp, s, channelId, length);
	}

	if (rdp->settings->UseRdpSecurityLayer)
	{
		if (!rdp_read_security_header(rdp, s, &securityFlags, &length))
			return STATE_RUN_FAILED;

		if (securityFlags & (SEC_ENCRYPT | SEC_REDIRECTION_PKT))
		{
			if (!rdp_decrypt(rdp, s, &length, securityFlags))
				return STATE_RUN_FAILED;
		}

		if (securityFlags & SEC_REDIRECTION_PKT)
		{
			/*
			 * [MS-RDPBCGR] 2.2.13.2.1
			 *  - no share control header, nor the 2 byte pad
			 */
			Stream_Rewind(s, 2);
			rdp->inPackets++;

			rc = rdp_recv_enhanced_security_redirection_packet(rdp, s);
			goto out;
		}
	}

	if (channelId == MCS_GLOBAL_CHANNEL_ID)
	{
		while (Stream_GetRemainingLength(s) > 3)
		{
			wStream subbuffer;
			wStream* sub = nullptr;
			size_t diff = 0;
			UINT16 remain = 0;

			if (!rdp_read_share_control_header(rdp, s, nullptr, &remain, &pduType, &pduSource))
				return STATE_RUN_FAILED;

			sub = Stream_StaticInit(&subbuffer, Stream_Pointer(s), remain);
			if (!Stream_SafeSeek(s, remain))
				return STATE_RUN_FAILED;

			rdp->settings->PduSource = pduSource;
			rdp->inPackets++;

			switch (pduType)
			{
				case PDU_TYPE_DATA:
					rc = rdp_recv_data_pdu(rdp, sub);
					if (state_run_failed(rc))
						return rc;
					break;

				case PDU_TYPE_DEACTIVATE_ALL:
					if (!rdp_recv_deactivate_all(rdp, sub))
					{
						WLog_Print(rdp->log, WLOG_ERROR,
						           "rdp_recv_tpkt_pdu: rdp_recv_deactivate_all() fail");
						return STATE_RUN_FAILED;
					}

					break;

				case PDU_TYPE_SERVER_REDIRECTION:
					return rdp_recv_enhanced_security_redirection_packet(rdp, sub);

				case PDU_TYPE_FLOW_RESPONSE:
				case PDU_TYPE_FLOW_STOP:
				case PDU_TYPE_FLOW_TEST:
					WLog_Print(rdp->log, WLOG_DEBUG, "flow message 0x%04" PRIX16 "", pduType);
					/* http://msdn.microsoft.com/en-us/library/cc240576.aspx */
					if (!Stream_SafeSeek(sub, remain))
						return STATE_RUN_FAILED;
					break;

				default:
				{
					char buffer[256] = WINPR_C_ARRAY_INIT;
					WLog_Print(rdp->log, WLOG_ERROR, "incorrect PDU type: %s",
					           pdu_type_to_str(pduType, buffer, sizeof(buffer)));
				}
				break;
			}

			diff = Stream_GetRemainingLength(sub);
			if (diff > 0)
			{
				char buffer[256] = WINPR_C_ARRAY_INIT;
				WLog_Print(rdp->log, WLOG_WARN,
				           "pduType %s not properly parsed, %" PRIuz
				           " bytes remaining unhandled. Skipping.",
				           pdu_type_to_str(pduType, buffer, sizeof(buffer)), diff);
			}
		}
	}
	else
	{
		rdp->inPackets++;

		if (!freerdp_channel_process(instance, s, channelId, length))
			return STATE_RUN_FAILED;
	}

out:
	if (!tpkt_ensure_stream_consumed(rdp->log, s, length))
		return STATE_RUN_FAILED;
	return rc;
}

static state_run_t rdp_recv_fastpath_pdu(rdpRdp* rdp, wStream* s)
{
	UINT16 length = 0;

	WINPR_ASSERT(rdp);
	rdpFastPath* fastpath = rdp->fastpath;

	if (!fastpath_read_header_rdp(fastpath, s, &length))
	{
		WLog_Print(rdp->log, WLOG_ERROR, "rdp_recv_fastpath_pdu: fastpath_read_header_rdp() fail");
		return STATE_RUN_FAILED;
	}

	if ((length == 0) || (!Stream_CheckAndLogRequiredLengthWLog(rdp->log, s, length)))
	{
		WLog_Print(rdp->log, WLOG_ERROR, "incorrect FastPath PDU header length %" PRIu16 "",
		           length);
		return STATE_RUN_FAILED;
	}

	if (rdp->autodetect->bandwidthMeasureStarted)
	{
		rdp->autodetect->bandwidthMeasureByteCount += length;
	}

	if (!fastpath_decrypt(fastpath, s, &length))
		return STATE_RUN_FAILED;

	return fastpath_recv_updates(rdp->fastpath, s);
}

static state_run_t rdp_recv_pdu(rdpRdp* rdp, wStream* s)
{
	const int rc = tpkt_verify_header(s);
	if (rc > 0)
		return rdp_recv_tpkt_pdu(rdp, s);
	else if (rc == 0)
		return rdp_recv_fastpath_pdu(rdp, s);
	else
		return STATE_RUN_FAILED;
}

static state_run_t rdp_handle_sc_flags(rdpRdp* rdp, wStream* s, UINT32 flag,
                                       CONNECTION_STATE nextState)
{
	const UINT32 mask = FINALIZE_SC_SYNCHRONIZE_PDU | FINALIZE_SC_CONTROL_COOPERATE_PDU |
	                    FINALIZE_SC_CONTROL_GRANTED_PDU | FINALIZE_SC_FONT_MAP_PDU;
	WINPR_ASSERT(rdp);
	state_run_t status = rdp_recv_pdu(rdp, s);
	if (state_run_success(status))
	{
		const UINT32 flags = rdp->finalize_sc_pdus & mask;
		if ((flags & flag) == flag)
		{
			if (!rdp_client_transition_to_state(rdp, nextState))
				status = STATE_RUN_FAILED;
			else
				status = STATE_RUN_SUCCESS;
		}
		else
		{
			char flag_buffer[256] = WINPR_C_ARRAY_INIT;
			char mask_buffer[256] = WINPR_C_ARRAY_INIT;
			WLog_Print(rdp->log, WLOG_WARN,
			           "[%s] unexpected server message, expected flag %s [have %s]",
			           rdp_get_state_string(rdp),
			           rdp_finalize_flags_to_str(flag, flag_buffer, sizeof(flag_buffer)),
			           rdp_finalize_flags_to_str(flags, mask_buffer, sizeof(mask_buffer)));
		}
	}
	return status;
}

static state_run_t rdp_client_exchange_monitor_layout(rdpRdp* rdp, wStream* s)
{
	WINPR_ASSERT(rdp);

	if (!rdp_check_monitor_layout_pdu_state(rdp, FALSE))
		return STATE_RUN_FAILED;

	/* We might receive unrelated messages from the server (channel traffic),
	 * so only proceed if some flag changed
	 */
	const UINT32 old = rdp->finalize_sc_pdus;
	state_run_t status = rdp_recv_pdu(rdp, s);
	const UINT32 now = rdp->finalize_sc_pdus;
	const BOOL changed = (old != now) || rdp->monitor_layout_pdu;

	/* This PDU is optional, so if we received a finalize PDU continue there */
	if (state_run_success(status) && changed)
	{
		if (!rdp->monitor_layout_pdu)
		{
			if (!rdp_finalize_is_flag_set(rdp, FINALIZE_SC_SYNCHRONIZE_PDU))
				return STATE_RUN_FAILED;
		}

		status = rdp_client_connect_finalize(rdp);
		if (state_run_success(status) && !rdp->monitor_layout_pdu)
			status = STATE_RUN_TRY_AGAIN;
	}
	return status;
}

static state_run_t rdp_recv_callback_int(WINPR_ATTR_UNUSED rdpTransport* transport, wStream* s,
                                         void* extra)
{
	state_run_t status = STATE_RUN_SUCCESS;
	rdpRdp* rdp = (rdpRdp*)extra;

	WINPR_ASSERT(transport);
	WINPR_ASSERT(rdp);
	WINPR_ASSERT(s);

	switch (rdp_get_state(rdp))
	{
		case CONNECTION_STATE_NEGO:
			if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_MCS_CREATE_REQUEST))
				status = STATE_RUN_FAILED;
			else
				status = STATE_RUN_CONTINUE;
			break;
		case CONNECTION_STATE_NLA:
			if (nla_get_state(rdp->nla) < NLA_STATE_AUTH_INFO)
			{
				if (nla_recv_pdu(rdp->nla, s) < 1)
				{
					WLog_Print(rdp->log, WLOG_ERROR, "%s - nla_recv_pdu() fail",
					           rdp_get_state_string(rdp));
					status = STATE_RUN_FAILED;
				}
			}
			else if (nla_get_state(rdp->nla) == NLA_STATE_POST_NEGO)
			{
				if (nego_recv(rdp->transport, s, (void*)rdp->nego) < 0)
					return STATE_RUN_FAILED;

				if (!nego_update_settings_from_state(rdp->nego, rdp->settings))
					return STATE_RUN_FAILED;

				if (nego_get_state(rdp->nego) != NEGO_STATE_FINAL)
				{
					WLog_Print(rdp->log, WLOG_ERROR, "%s - nego_recv() fail",
					           rdp_get_state_string(rdp));
					status = STATE_RUN_FAILED;
				}
				else if (!nla_set_state(rdp->nla, NLA_STATE_FINAL))
					status = STATE_RUN_FAILED;
			}

			if (state_run_success(status))
			{
				if (nla_get_state(rdp->nla) == NLA_STATE_AUTH_INFO)
				{
					transport_set_nla_mode(rdp->transport, FALSE);

					if (rdp->settings->VmConnectMode)
					{
						if (!nego_set_state(rdp->nego, NEGO_STATE_NLA))
							status = STATE_RUN_FAILED;
						else if (!nego_set_requested_protocols(rdp->nego,
						                                       PROTOCOL_HYBRID | PROTOCOL_SSL))
							status = STATE_RUN_FAILED;
						else if (!nego_send_negotiation_request(rdp->nego))
							status = STATE_RUN_FAILED;
						else if (!nla_set_state(rdp->nla, NLA_STATE_POST_NEGO))
							status = STATE_RUN_FAILED;
					}
					else
					{
						if (!nla_set_state(rdp->nla, NLA_STATE_FINAL))
							status = STATE_RUN_FAILED;
					}
				}
			}
			if (state_run_success(status))
			{

				if (nla_get_state(rdp->nla) == NLA_STATE_FINAL)
				{
					if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_MCS_CREATE_REQUEST))
						status = STATE_RUN_FAILED;
					else
						status = STATE_RUN_CONTINUE;
				}
			}
			break;

		case CONNECTION_STATE_AAD:
			if (aad_recv(rdp->aad, s) < 1)
			{
				WLog_Print(rdp->log, WLOG_ERROR, "%s - aad_recv() fail", rdp_get_state_string(rdp));
				status = STATE_RUN_FAILED;
			}
			if (state_run_success(status))
			{
				if (aad_get_state(rdp->aad) == AAD_STATE_FINAL)
				{
					transport_set_aad_mode(rdp->transport, FALSE);
					if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_MCS_CREATE_REQUEST))
						status = STATE_RUN_FAILED;
					else
						status = STATE_RUN_CONTINUE;
				}
			}
			break;

		case CONNECTION_STATE_MCS_CREATE_REQUEST:
			if (!mcs_client_begin(rdp->mcs))
			{
				WLog_Print(rdp->log, WLOG_ERROR, "%s - mcs_client_begin() fail",
				           rdp_get_state_string(rdp));
				status = STATE_RUN_FAILED;
			}
			else if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_MCS_CREATE_RESPONSE))
				status = STATE_RUN_FAILED;
			else if (Stream_GetRemainingLength(s) > 0)
				status = STATE_RUN_CONTINUE;
			break;

		case CONNECTION_STATE_MCS_CREATE_RESPONSE:
			if (!mcs_recv_connect_response(rdp->mcs, s))
			{
				WLog_Print(rdp->log, WLOG_ERROR, "mcs_recv_connect_response failure");
				status = STATE_RUN_FAILED;
			}
			else
			{
				if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_MCS_ERECT_DOMAIN))
					status = STATE_RUN_FAILED;
				else if (!mcs_send_erect_domain_request(rdp->mcs))
				{
					WLog_Print(rdp->log, WLOG_ERROR, "mcs_send_erect_domain_request failure");
					status = STATE_RUN_FAILED;
				}
				else if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_MCS_ATTACH_USER))
					status = STATE_RUN_FAILED;
				else if (!mcs_send_attach_user_request(rdp->mcs))
				{
					WLog_Print(rdp->log, WLOG_ERROR, "mcs_send_attach_user_request failure");
					status = STATE_RUN_FAILED;
				}
				else if (!rdp_client_transition_to_state(rdp,
				                                         CONNECTION_STATE_MCS_ATTACH_USER_CONFIRM))
					status = STATE_RUN_FAILED;
			}
			break;

		case CONNECTION_STATE_MCS_ATTACH_USER_CONFIRM:
			if (!mcs_recv_attach_user_confirm(rdp->mcs, s))
			{
				WLog_Print(rdp->log, WLOG_ERROR, "mcs_recv_attach_user_confirm failure");
				status = STATE_RUN_FAILED;
			}
			else if (!freerdp_settings_get_bool(rdp->settings, FreeRDP_SupportSkipChannelJoin))
			{
				if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_MCS_CHANNEL_JOIN_REQUEST))
					status = STATE_RUN_FAILED;
				else if (!mcs_send_channel_join_request(rdp->mcs, rdp->mcs->userId))
				{
					WLog_Print(rdp->log, WLOG_ERROR, "mcs_send_channel_join_request failure");
					status = STATE_RUN_FAILED;
				}
				else if (!rdp_client_transition_to_state(
				             rdp, CONNECTION_STATE_MCS_CHANNEL_JOIN_RESPONSE))
					status = STATE_RUN_FAILED;
			}
			else
			{
				/* SKIP_CHANNELJOIN is active, consider channels to be joined */
				if (!rdp_client_skip_mcs_channel_join(rdp))
					status = STATE_RUN_FAILED;
			}
			break;

		case CONNECTION_STATE_MCS_CHANNEL_JOIN_RESPONSE:
			if (!rdp_client_connect_mcs_channel_join_confirm(rdp, s))
			{
				WLog_Print(rdp->log, WLOG_ERROR,
				           "%s - "
				           "rdp_client_connect_mcs_channel_join_confirm() fail",
				           rdp_get_state_string(rdp));
				status = STATE_RUN_FAILED;
			}

			break;

		case CONNECTION_STATE_CONNECT_TIME_AUTO_DETECT_REQUEST:
			if (!rdp_client_connect_auto_detect(rdp, s, WLOG_DEBUG))
			{
				if (!rdp_client_transition_to_state(rdp, CONNECTION_STATE_LICENSING))
					status = STATE_RUN_FAILED;
				else
					status = STATE_RUN_TRY_AGAIN;
			}
			break;

		case CONNECTION_STATE_LICENSING:
			status = rdp_client_connect_license(rdp, s);

			if (state_run_failed(status))
			{
				char buffer[64] = WINPR_C_ARRAY_INIT;
				WLog_Print(rdp->log, WLOG_DEBUG, "%s - rdp_client_connect_license() - %s",
				           rdp_get_state_string(rdp),
				           state_run_result_string(status, buffer, ARRAYSIZE(buffer)));
			}

			break;

		case CONNECTION_STATE_MULTITRANSPORT_BOOTSTRAPPING_REQUEST:
			if (!rdp_client_connect_auto_detect(rdp, s, WLOG_DEBUG))
			{
				if (!rdp_client_transition_to_state(
				        rdp, CONNECTION_STATE_CAPABILITIES_EXCHANGE_DEMAND_ACTIVE))
					status = STATE_RUN_FAILED;
				else
					status = STATE_RUN_TRY_AGAIN;
			}
			break;

		case CONNECTION_STATE_CAPABILITIES_EXCHANGE_DEMAND_ACTIVE:
			status = rdp_client_connect_demand_active(rdp, s);

			if (state_run_failed(status))
			{
				char buffer[64] = WINPR_C_ARRAY_INIT;
				WLog_Print(rdp->log, WLOG_DEBUG,
				           "%s - "
				           "rdp_client_connect_demand_active() - %s",
				           rdp_get_state_string(rdp),
				           state_run_result_string(status, buffer, ARRAYSIZE(buffer)));
			}
			else if (status == STATE_RUN_ACTIVE)
			{
				if (!rdp_client_transition_to_state(
				        rdp, CONNECTION_STATE_CAPABILITIES_EXCHANGE_CONFIRM_ACTIVE))
					status = STATE_RUN_FAILED;
				else
					status = STATE_RUN_CONTINUE;
			}
			break;

		case CONNECTION_STATE_CAPABILITIES_EXCHANGE_MONITOR_LAYOUT:
			status = rdp_client_exchange_monitor_layout(rdp, s);
			break;

		case CONNECTION_STATE_CAPABILITIES_EXCHANGE_CONFIRM_ACTIVE:
			status = rdp_client_connect_confirm_active(rdp, s);
			break;

		case CONNECTION_STATE_FINALIZATION_CLIENT_SYNC:
			status = rdp_handle_sc_flags(rdp, s, FINALIZE_SC_SYNCHRONIZE_PDU,
			                             CONNECTION_STATE_FINALIZATION_CLIENT_COOPERATE);
			break;
		case CONNECTION_STATE_FINALIZATION_CLIENT_COOPERATE:
			status = rdp_handle_sc_flags(rdp, s, FINALIZE_SC_CONTROL_COOPERATE_PDU,
			                             CONNECTION_STATE_FINALIZATION_CLIENT_GRANTED_CONTROL);
			break;
		case CONNECTION_STATE_FINALIZATION_CLIENT_GRANTED_CONTROL:
			status = rdp_handle_sc_flags(rdp, s, FINALIZE_SC_CONTROL_GRANTED_PDU,
			                             CONNECTION_STATE_FINALIZATION_CLIENT_FONT_MAP);
			break;
		case CONNECTION_STATE_FINALIZATION_CLIENT_FONT_MAP:
			status = rdp_handle_sc_flags(rdp, s, FINALIZE_SC_FONT_MAP_PDU, CONNECTION_STATE_ACTIVE);
			break;

		case CONNECTION_STATE_ACTIVE:
			status = rdp_recv_pdu(rdp, s);

			if (state_run_failed(status))
			{
				char buffer[64] = WINPR_C_ARRAY_INIT;
				WLog_Print(rdp->log, WLOG_DEBUG, "%s - rdp_recv_pdu() - %s",
				           rdp_get_state_string(rdp),
				           state_run_result_string(status, buffer, ARRAYSIZE(buffer)));
			}
			break;

		default:
			WLog_Print(rdp->log, WLOG_ERROR, "%s state %u", rdp_get_state_string(rdp),
			           rdp_get_state(rdp));
			status = STATE_RUN_FAILED;
			break;
	}

	if (state_run_failed(status))
	{
		char buffer[64] = WINPR_C_ARRAY_INIT;
		WLog_Print(rdp->log, WLOG_ERROR, "%s status %s", rdp_get_state_string(rdp),
		           state_run_result_string(status, buffer, ARRAYSIZE(buffer)));
	}
	return status;
}

state_run_t rdp_recv_callback(rdpTransport* transport, wStream* s, void* extra)
{
	char buffer[64] = WINPR_C_ARRAY_INIT;
	state_run_t rc = STATE_RUN_FAILED;
	const size_t start = Stream_GetPosition(s);
	const rdpContext* context = transport_get_context(transport);

	WINPR_ASSERT(context);
	do
	{
		const rdpRdp* rdp = context->rdp;
		WINPR_ASSERT(rdp);

		if (rc == STATE_RUN_TRY_AGAIN)
		{
			if (!Stream_SetPosition(s, start))
				return STATE_RUN_FAILED;
		}

		const char* old = rdp_get_state_string(rdp);
		const size_t orem = Stream_GetRemainingLength(s);
		rc = rdp_recv_callback_int(transport, s, extra);

		const char* now = rdp_get_state_string(rdp);
		const size_t rem = Stream_GetRemainingLength(s);

		WLog_Print(rdp->log, WLOG_TRACE,
		           "(client)[%s -> %s] current return %s [feeding %" PRIuz " bytes, %" PRIuz
		           " bytes not processed]",
		           old, now, state_run_result_string(rc, buffer, sizeof(buffer)), orem, rem);
	} while ((rc == STATE_RUN_TRY_AGAIN) || (rc == STATE_RUN_CONTINUE));
	return rc;
}

BOOL rdp_send_channel_data(rdpRdp* rdp, UINT16 channelId, const BYTE* data, size_t size)
{
	return freerdp_channel_send(rdp, channelId, data, size);
}

BOOL rdp_channel_send_packet(rdpRdp* rdp, UINT16 channelId, size_t totalSize, UINT32 flags,
                             const BYTE* data, size_t chunkSize)
{
	return freerdp_channel_send_packet(rdp, channelId, totalSize, flags, data, chunkSize);
}

BOOL rdp_send_error_info(rdpRdp* rdp)
{
	UINT16 sec_flags = 0;
	wStream* s = nullptr;
	BOOL status = 0;

	if (rdp->errorInfo == ERRINFO_SUCCESS)
		return TRUE;

	s = rdp_data_pdu_init(rdp, &sec_flags);

	if (!s)
		return FALSE;

	Stream_Write_UINT32(s, rdp->errorInfo); /* error id (4 bytes) */
	status = rdp_send_data_pdu(rdp, s, DATA_PDU_TYPE_SET_ERROR_INFO, 0, sec_flags);
	return status;
}

int rdp_check_fds(rdpRdp* rdp)
{
	int status = 0;
	rdpTsg* tsg = nullptr;
	rdpTransport* transport = nullptr;

	WINPR_ASSERT(rdp);
	transport = rdp->transport;

	tsg = transport_get_tsg(transport);
	if (tsg)
	{
		if (!tsg_check_event_handles(tsg))
		{
			WLog_Print(rdp->log, WLOG_ERROR, "rdp_check_fds: tsg_check_event_handles()");
			return -1;
		}

		if (tsg_get_state(tsg) != TSG_STATE_PIPE_CREATED)
			return 1;
	}

	status = transport_check_fds(transport);

	if (status == 1)
	{
		if (!rdp_client_redirect(rdp)) /* session redirection */
			return -1;
	}

	if (status < 0)
		WLog_Print(rdp->log, WLOG_DEBUG, "transport_check_fds() - %i", status);
	else
		status = freerdp_timer_poll(rdp->timer);

	return status;
}

BOOL freerdp_get_stats(const rdpRdp* rdp, UINT64* inBytes, UINT64* outBytes, UINT64* inPackets,
                       UINT64* outPackets)
{
	if (!rdp)
		return FALSE;

	if (inBytes)
		*inBytes = rdp->inBytes;
	if (outBytes)
		*outBytes = rdp->outBytes;
	if (inPackets)
		*inPackets = rdp->inPackets;
	if (outPackets)
		*outPackets = rdp->outPackets;

	return TRUE;
}

static bool rdp_new_common(rdpRdp* rdp)
{
	WINPR_ASSERT(rdp);

	bool rc = false;
	rdp->transport = transport_new(rdp->context);
	if (!rdp->transport)
		goto fail;

	if (rdp->io)
	{
		if (!transport_set_io_callbacks(rdp->transport, rdp->io))
			goto fail;
	}

	rdp->aad = aad_new(rdp->context);
	if (!rdp->aad)
		goto fail;

	rdp->nego = nego_new(rdp->transport);
	if (!rdp->nego)
		goto fail;

	rdp->mcs = mcs_new(rdp->context);
	if (!rdp->mcs)
		goto fail;

	rdp->license = license_new(rdp);
	if (!rdp->license)
		goto fail;

	rdp->fastpath = fastpath_new(rdp);
	if (!rdp->fastpath)
		goto fail;

	rc = true;
fail:
	return rc;
}

/**
 * Instantiate new RDP module.
 * @return new RDP module
 */

rdpRdp* rdp_new(rdpContext* context)
{
	DWORD flags = 0;
	rdpRdp* rdp = (rdpRdp*)calloc(1, sizeof(rdpRdp));

	if (!rdp)
		return nullptr;

	rdp->log = WLog_Create(RDP_TAG, WLog_GetRoot());
	if (!rdp->log)
		goto fail;

	(void)_snprintf(rdp->log_context, sizeof(rdp->log_context), "%p", (void*)context);
	if (!WLog_SetContext(rdp->log, nullptr, rdp->log_context))
		goto fail;

	InitializeCriticalSection(&rdp->critical);
	rdp->context = context;
	WINPR_ASSERT(rdp->context);

	if (context->ServerMode)
		flags |= FREERDP_SETTINGS_SERVER_MODE;

	if (!context->settings)
	{
		context->settings = rdp->settings = freerdp_settings_new(flags);

		if (!rdp->settings)
			goto fail;
	}
	else
		rdp->settings = context->settings;

	/* Keep a backup copy of settings for later comparisons */
	if (!rdp_set_backup_settings(rdp))
		goto fail;

	rdp->settings->instance = context->instance;

	context->settings = rdp->settings;
	if (context->instance)
		context->settings->instance = context->instance;
	else if (context->peer)
	{
		rdp->settings->instance = context->peer;

#if defined(WITH_FREERDP_DEPRECATED)
		context->peer->settings = rdp->settings;
#endif
	}

	if (!rdp_new_common(rdp))
		goto fail;

	{
		const rdpTransportIo* io = transport_get_io_callbacks(rdp->transport);
		if (!io)
			goto fail;
		rdp->io = calloc(1, sizeof(rdpTransportIo));
		if (!rdp->io)
			goto fail;
		*rdp->io = *io;
	}

	rdp->input = input_new(rdp);

	if (!rdp->input)
		goto fail;

	rdp->update = update_new(rdp);

	if (!rdp->update)
		goto fail;

	rdp->redirection = redirection_new();

	if (!rdp->redirection)
		goto fail;

	rdp->autodetect = autodetect_new(rdp->context);

	if (!rdp->autodetect)
		goto fail;

	rdp->heartbeat = heartbeat_new();

	if (!rdp->heartbeat)
		goto fail;

	rdp->multitransport = multitransport_new(rdp, INITIATE_REQUEST_PROTOCOL_UDPFECL |
	                                                  INITIATE_REQUEST_PROTOCOL_UDPFECR);

	if (!rdp->multitransport)
		goto fail;

	rdp->bulk = bulk_new(context);

	if (!rdp->bulk)
		goto fail;

	rdp->pubSub = PubSub_New(TRUE);
	if (!rdp->pubSub)
		goto fail;

	rdp->abortEvent = CreateEvent(nullptr, TRUE, FALSE, nullptr);
	if (!rdp->abortEvent)
		goto fail;

	rdp->timer = freerdp_timer_new(rdp);
	if (!rdp->timer)
		goto fail;

	return rdp;

fail:
	WINPR_PRAGMA_DIAG_PUSH
	WINPR_PRAGMA_DIAG_IGNORED_MISMATCHED_DEALLOC
	rdp_free(rdp);
	WINPR_PRAGMA_DIAG_POP
	return nullptr;
}

static void rdp_reset_free(rdpRdp* rdp)
{
	WINPR_ASSERT(rdp);

	security_lock(rdp);
	rdp_free_rc4_decrypt_keys(rdp);
	rdp_free_rc4_encrypt_keys(rdp);

	winpr_Cipher_Free(rdp->fips_encrypt);
	winpr_Cipher_Free(rdp->fips_decrypt);
	rdp->fips_encrypt = nullptr;
	rdp->fips_decrypt = nullptr;
	security_unlock(rdp);

	aad_free(rdp->aad);
	mcs_free(rdp->mcs);
	nego_free(rdp->nego);
	license_free(rdp->license);
	transport_free(rdp->transport);
	fastpath_free(rdp->fastpath);

	rdp->aad = nullptr;
	rdp->mcs = nullptr;
	rdp->nego = nullptr;
	rdp->license = nullptr;
	rdp->transport = nullptr;
	rdp->fastpath = nullptr;
}

BOOL rdp_reset(rdpRdp* rdp)
{
	BOOL rc = TRUE;

	WINPR_ASSERT(rdp);

	rdpSettings* settings = rdp->settings;
	WINPR_ASSERT(settings);

	bulk_reset(rdp->bulk);

	rdp_reset_free(rdp);

	if (!freerdp_settings_set_pointer_len(settings, FreeRDP_ServerRandom, nullptr, 0))
		rc = FALSE;

	if (!freerdp_settings_set_pointer_len(settings, FreeRDP_ServerCertificate, nullptr, 0))
		rc = FALSE;

	if (!freerdp_settings_set_string(settings, FreeRDP_ClientAddress, nullptr))
		rc = FALSE;

	if (!rc)
		goto fail;

	rc = rdp_new_common(rdp);
	if (!rc)
		goto fail;

	if (!transport_set_layer(rdp->transport, TRANSPORT_LAYER_TCP))
		goto fail;

	rdp->errorInfo = 0;
	rc = rdp_finalize_reset_flags(rdp, TRUE);

fail:
	return rc;
}

/**
 * Free RDP module.
 * @param rdp RDP module to be freed
 */

void rdp_free(rdpRdp* rdp)
{
	if (rdp)
	{
		freerdp_timer_free(rdp->timer);
		rdp_reset_free(rdp);

		freerdp_settings_free(rdp->settings);
		freerdp_settings_free(rdp->originalSettings);
		freerdp_settings_free(rdp->remoteSettings);

		input_free(rdp->input);
		update_free(rdp->update);
		nla_free(rdp->nla);
		redirection_free(rdp->redirection);
		autodetect_free(rdp->autodetect);
		heartbeat_free(rdp->heartbeat);
		multitransport_free(rdp->multitransport);
		bulk_free(rdp->bulk);
		free(rdp->io);
		PubSub_Free(rdp->pubSub);
		if (rdp->abortEvent)
			(void)CloseHandle(rdp->abortEvent);
		aad_free(rdp->aad);
		WINPR_JSON_Delete(rdp->wellknown);
		DeleteCriticalSection(&rdp->critical);
		WLog_Discard(rdp->log);
		free(rdp);
	}
}

BOOL rdp_io_callback_set_event(rdpRdp* rdp, BOOL set)
{
	if (!rdp)
		return FALSE;
	return transport_io_callback_set_event(rdp->transport, set);
}

const rdpTransportIo* rdp_get_io_callbacks(rdpRdp* rdp)
{
	if (!rdp)
		return nullptr;
	return rdp->io;
}

BOOL rdp_set_io_callbacks(rdpRdp* rdp, const rdpTransportIo* io_callbacks)
{
	if (!rdp)
		return FALSE;
	free(rdp->io);
	rdp->io = nullptr;
	if (io_callbacks)
	{
		rdp->io = malloc(sizeof(rdpTransportIo));
		if (!rdp->io)
			return FALSE;
		*rdp->io = *io_callbacks;
		return transport_set_io_callbacks(rdp->transport, rdp->io);
	}
	return TRUE;
}

BOOL rdp_set_io_callback_context(rdpRdp* rdp, void* usercontext)
{
	WINPR_ASSERT(rdp);
	rdp->ioContext = usercontext;
	return TRUE;
}

void* rdp_get_io_callback_context(rdpRdp* rdp)
{
	WINPR_ASSERT(rdp);
	return rdp->ioContext;
}

const char* rdp_finalize_flags_to_str(UINT32 flags, char* buffer, size_t size)
{
	char number[32] = WINPR_C_ARRAY_INIT;
	const UINT32 mask =
	    (uint32_t)~(FINALIZE_SC_SYNCHRONIZE_PDU | FINALIZE_SC_CONTROL_COOPERATE_PDU |
	                FINALIZE_SC_CONTROL_GRANTED_PDU | FINALIZE_SC_FONT_MAP_PDU |
	                FINALIZE_CS_SYNCHRONIZE_PDU | FINALIZE_CS_CONTROL_COOPERATE_PDU |
	                FINALIZE_CS_CONTROL_REQUEST_PDU | FINALIZE_CS_PERSISTENT_KEY_LIST_PDU |
	                FINALIZE_CS_FONT_LIST_PDU | FINALIZE_DEACTIVATE_REACTIVATE);

	if (flags & FINALIZE_SC_SYNCHRONIZE_PDU)
		winpr_str_append("FINALIZE_SC_SYNCHRONIZE_PDU", buffer, size, "|");
	if (flags & FINALIZE_SC_CONTROL_COOPERATE_PDU)
		winpr_str_append("FINALIZE_SC_CONTROL_COOPERATE_PDU", buffer, size, "|");
	if (flags & FINALIZE_SC_CONTROL_GRANTED_PDU)
		winpr_str_append("FINALIZE_SC_CONTROL_GRANTED_PDU", buffer, size, "|");
	if (flags & FINALIZE_SC_FONT_MAP_PDU)
		winpr_str_append("FINALIZE_SC_FONT_MAP_PDU", buffer, size, "|");
	if (flags & FINALIZE_CS_SYNCHRONIZE_PDU)
		winpr_str_append("FINALIZE_CS_SYNCHRONIZE_PDU", buffer, size, "|");
	if (flags & FINALIZE_CS_CONTROL_COOPERATE_PDU)
		winpr_str_append("FINALIZE_CS_CONTROL_COOPERATE_PDU", buffer, size, "|");
	if (flags & FINALIZE_CS_CONTROL_REQUEST_PDU)
		winpr_str_append("FINALIZE_CS_CONTROL_REQUEST_PDU", buffer, size, "|");
	if (flags & FINALIZE_CS_PERSISTENT_KEY_LIST_PDU)
		winpr_str_append("FINALIZE_CS_PERSISTENT_KEY_LIST_PDU", buffer, size, "|");
	if (flags & FINALIZE_CS_FONT_LIST_PDU)
		winpr_str_append("FINALIZE_CS_FONT_LIST_PDU", buffer, size, "|");
	if (flags & FINALIZE_DEACTIVATE_REACTIVATE)
		winpr_str_append("FINALIZE_DEACTIVATE_REACTIVATE", buffer, size, "|");
	if (flags & mask)
		winpr_str_append("UNKNOWN_FLAG", buffer, size, "|");
	if (flags == 0)
		winpr_str_append("NO_FLAG_SET", buffer, size, "|");
	(void)_snprintf(number, sizeof(number), " [0x%08" PRIx32 "]", flags);
	winpr_str_append(number, buffer, size, "");
	return buffer;
}

BOOL rdp_finalize_reset_flags(rdpRdp* rdp, BOOL clearAll)
{
	WINPR_ASSERT(rdp);
	WLog_Print(rdp->log, WLOG_DEBUG, "[%s] reset finalize_sc_pdus", rdp_get_state_string(rdp));
	if (clearAll)
		rdp->finalize_sc_pdus = 0;
	else
		rdp->finalize_sc_pdus &= FINALIZE_DEACTIVATE_REACTIVATE;

	return rdp_set_monitor_layout_pdu_state(rdp, FALSE);
}

BOOL rdp_finalize_set_flag(rdpRdp* rdp, UINT32 flag)
{
	char buffer[1024] = WINPR_C_ARRAY_INIT;

	WINPR_ASSERT(rdp);

	WLog_Print(rdp->log, WLOG_DEBUG, "[%s] received flag %s", rdp_get_state_string(rdp),
	           rdp_finalize_flags_to_str(flag, buffer, sizeof(buffer)));
	rdp->finalize_sc_pdus |= flag;
	return TRUE;
}

BOOL rdp_finalize_is_flag_set(rdpRdp* rdp, UINT32 flag)
{
	WINPR_ASSERT(rdp);
	return (rdp->finalize_sc_pdus & flag) == flag;
}

BOOL rdp_reset_rc4_encrypt_keys(rdpRdp* rdp)
{
	WINPR_ASSERT(rdp);
	rdp_free_rc4_encrypt_keys(rdp);
	rdp->rc4_encrypt_key = winpr_RC4_New(rdp->encrypt_key, rdp->rc4_key_len);

	rdp->encrypt_use_count = 0;
	return rdp->rc4_encrypt_key != nullptr;
}

void rdp_free_rc4_encrypt_keys(rdpRdp* rdp)
{
	WINPR_ASSERT(rdp);
	winpr_RC4_Free(rdp->rc4_encrypt_key);
	rdp->rc4_encrypt_key = nullptr;
}

void rdp_free_rc4_decrypt_keys(rdpRdp* rdp)
{
	WINPR_ASSERT(rdp);
	winpr_RC4_Free(rdp->rc4_decrypt_key);
	rdp->rc4_decrypt_key = nullptr;
}

BOOL rdp_reset_rc4_decrypt_keys(rdpRdp* rdp)
{
	WINPR_ASSERT(rdp);
	rdp_free_rc4_decrypt_keys(rdp);
	rdp->rc4_decrypt_key = winpr_RC4_New(rdp->decrypt_key, rdp->rc4_key_len);

	rdp->decrypt_use_count = 0;
	return rdp->rc4_decrypt_key != nullptr;
}

const char* rdp_security_flag_string(UINT32 securityFlags, char* buffer, size_t size)
{
	if (securityFlags & SEC_EXCHANGE_PKT)
		winpr_str_append("SEC_EXCHANGE_PKT", buffer, size, "|");
	if (securityFlags & SEC_TRANSPORT_REQ)
		winpr_str_append("SEC_TRANSPORT_REQ", buffer, size, "|");
	if (securityFlags & SEC_TRANSPORT_RSP)
		winpr_str_append("SEC_TRANSPORT_RSP", buffer, size, "|");
	if (securityFlags & SEC_ENCRYPT)
		winpr_str_append("SEC_ENCRYPT", buffer, size, "|");
	if (securityFlags & SEC_RESET_SEQNO)
		winpr_str_append("SEC_RESET_SEQNO", buffer, size, "|");
	if (securityFlags & SEC_IGNORE_SEQNO)
		winpr_str_append("SEC_IGNORE_SEQNO", buffer, size, "|");
	if (securityFlags & SEC_INFO_PKT)
		winpr_str_append("SEC_INFO_PKT", buffer, size, "|");
	if (securityFlags & SEC_LICENSE_PKT)
		winpr_str_append("SEC_LICENSE_PKT", buffer, size, "|");
	if (securityFlags & SEC_LICENSE_ENCRYPT_CS)
		winpr_str_append("SEC_LICENSE_ENCRYPT_CS", buffer, size, "|");
	if (securityFlags & SEC_LICENSE_ENCRYPT_SC)
		winpr_str_append("SEC_LICENSE_ENCRYPT_SC", buffer, size, "|");
	if (securityFlags & SEC_REDIRECTION_PKT)
		winpr_str_append("SEC_REDIRECTION_PKT", buffer, size, "|");
	if (securityFlags & SEC_SECURE_CHECKSUM)
		winpr_str_append("SEC_SECURE_CHECKSUM", buffer, size, "|");
	if (securityFlags & SEC_AUTODETECT_REQ)
		winpr_str_append("SEC_AUTODETECT_REQ", buffer, size, "|");
	if (securityFlags & SEC_AUTODETECT_RSP)
		winpr_str_append("SEC_AUTODETECT_RSP", buffer, size, "|");
	if (securityFlags & SEC_HEARTBEAT)
		winpr_str_append("SEC_HEARTBEAT", buffer, size, "|");
	if (securityFlags & SEC_FLAGSHI_VALID)
		winpr_str_append("SEC_FLAGSHI_VALID", buffer, size, "|");
	{
		char msg[32] = WINPR_C_ARRAY_INIT;

		(void)_snprintf(msg, sizeof(msg), "[0x%08" PRIx32 "]", securityFlags);
		winpr_str_append(msg, buffer, size, "");
	}
	return buffer;
}

static BOOL rdp_reset_remote_settings(rdpRdp* rdp)
{
	UINT32 flags = FREERDP_SETTINGS_REMOTE_MODE;
	WINPR_ASSERT(rdp);
	freerdp_settings_free(rdp->remoteSettings);

	if (!freerdp_settings_get_bool(rdp->settings, FreeRDP_ServerMode))
		flags |= FREERDP_SETTINGS_SERVER_MODE;
	rdp->remoteSettings = freerdp_settings_new(flags);
	return rdp->remoteSettings != nullptr;
}

BOOL rdp_set_backup_settings(rdpRdp* rdp)
{
	WINPR_ASSERT(rdp);
	freerdp_settings_free(rdp->originalSettings);
	rdp->originalSettings = freerdp_settings_clone(rdp->settings);
	if (!rdp->originalSettings)
		return FALSE;
	return rdp_reset_remote_settings(rdp);
}

BOOL rdp_reset_runtime_settings(rdpRdp* rdp)
{
	WINPR_ASSERT(rdp);
	WINPR_ASSERT(rdp->context);

	freerdp_settings_free(rdp->settings);
	rdp->context->settings = rdp->settings = freerdp_settings_clone(rdp->originalSettings);

	if (!rdp->settings)
		return FALSE;
	return rdp_reset_remote_settings(rdp);
}

static BOOL starts_with(const char* tok, const char* val)
{
	const size_t len = strlen(val);
	if (strncmp(tok, val, len) != 0)
		return FALSE;
	if (tok[len] != '=')
		return FALSE;
	return TRUE;
}

static BOOL option_equals(const char* what, const char* val)
{
	return _stricmp(what, val) == 0;
}

static BOOL parse_on_off_option(const char* value)
{
	WINPR_ASSERT(value);
	const char* sep = strchr(value, '=');
	if (!sep)
		return TRUE;
	if (option_equals("on", &sep[1]))
		return TRUE;
	if (option_equals("true", &sep[1]))
		return TRUE;
	if (option_equals("off", &sep[1]))
		return FALSE;
	if (option_equals("false", &sep[1]))
		return FALSE;

	errno = 0;
	long val = strtol(value, nullptr, 0);
	if (errno == 0)
		return (val != 0);

	return FALSE;
}

#define STR(x) #x

static BOOL option_is_runtime_checks(WINPR_ATTR_UNUSED wLog* log, const char* tok)
{
	const char* experimental[] = { STR(WITH_VERBOSE_WINPR_ASSERT) };
	for (size_t x = 0; x < ARRAYSIZE(experimental); x++)
	{
		const char* opt = experimental[x];
		if (starts_with(tok, opt))
		{
			return parse_on_off_option(tok);
		}
	}
	return FALSE;
}

static BOOL option_is_experimental(WINPR_ATTR_UNUSED wLog* log, const char* tok)
{
	const char* experimental[] = { STR(WITH_DSP_EXPERIMENTAL), STR(WITH_VAAPI),
		                           STR(WITH_GFX_AV1),          STR(WITH_VAAPI_H264_ENCODING),
		                           STR(WITH_MEDIACODEC),       STR(WITH_CLIENT_SDL2),
		                           STR(WITH_OPENCL),           STR(WITH_LIBRESSL),
		                           STR(WITH_MBEDTLS),          STR(WITH_MEDIA_FOUNDATION),
		                           STR(WITH_KRB5_HEIMDAL),     STR(WITH_VIDEOTOOLBOX) };
	for (size_t x = 0; x < ARRAYSIZE(experimental); x++)
	{
		const char* opt = experimental[x];
		if (starts_with(tok, opt))
		{
			return parse_on_off_option(tok);
		}
	}
	return FALSE;
}

static BOOL option_is_debug(wLog* log, const char* tok)
{
	WINPR_ASSERT(log);
	const char* debug[] = { STR(WITH_DEBUG_ALL),
		                    STR(WITH_DEBUG_CERTIFICATE),
		                    STR(WITH_DEBUG_CAPABILITIES),
		                    STR(WITH_DEBUG_CHANNELS),
		                    STR(WITH_DEBUG_CLIPRDR),
		                    STR(WITH_DEBUG_CODECS),
		                    STR(WITH_DEBUG_DVC),
		                    STR(WITH_DEBUG_TSMF),
		                    STR(WITH_DEBUG_KBD),
		                    STR(WITH_DEBUG_LICENSE),
		                    STR(WITH_DEBUG_NEGO),
		                    STR(WITH_DEBUG_NLA),
		                    STR(WITH_DEBUG_TSG),
		                    STR(WITH_DEBUG_RAIL),
		                    STR(WITH_DEBUG_RDP),
		                    STR(WITH_DEBUG_RDPEI),
		                    STR(WITH_DEBUG_REDIR),
		                    STR(WITH_DEBUG_RDPDR),
		                    STR(WITH_DEBUG_RFX),
		                    STR(WITH_DEBUG_SCARD),
		                    STR(WITH_DEBUG_SND),
		                    STR(WITH_DEBUG_SVC),
		                    STR(WITH_DEBUG_TRANSPORT),
		                    STR(WITH_DEBUG_TIMEZONE),
		                    STR(WITH_DEBUG_WND),
		                    STR(WITH_DEBUG_RINGBUFFER),
		                    STR(WITH_DEBUG_SYMBOLS),
		                    STR(WITH_DEBUG_EVENTS),
		                    STR(WITH_DEBUG_MUTEX),
		                    STR(WITH_DEBUG_NTLM),
		                    STR(WITH_DEBUG_SDL_KBD_EVENTS),
		                    STR(WITH_DEBUG_SDL_KBD_EVENTS),
		                    STR(WITH_DEBUG_THREADS),
		                    STR(WITH_DEBUG_URBDRC) };

	for (size_t x = 0; x < ARRAYSIZE(debug); x++)
	{
		const char* opt = debug[x];
		if (starts_with(tok, opt))
			return parse_on_off_option(tok);
	}

	if (starts_with(tok, "WITH_DEBUG"))
	{
		WLog_Print(log, WLOG_WARN, "[BUG] Unmapped Debug-Build option '%s'.", tok);
		return parse_on_off_option(tok);
	}

	return FALSE;
}

static void log_build_warn(rdpRdp* rdp, const char* what, const char* msg,
                           BOOL (*cmp)(wLog* log, const char* tok))
{
	WINPR_ASSERT(rdp);
	WINPR_PRAGMA_DIAG_PUSH
	WINPR_PRAGMA_DIAG_IGNORED_OVERLENGTH_STRINGS

	size_t len = sizeof(FREERDP_BUILD_CONFIG);
	char* list = calloc(len, sizeof(char));
	char* config = _strdup(FREERDP_BUILD_CONFIG);
	WINPR_PRAGMA_DIAG_POP

	if (config && list)
	{
		char* saveptr = nullptr;
		char* tok = strtok_s(config, " ", &saveptr);
		while (tok)
		{
			if (cmp(rdp->log, tok))
				winpr_str_append(tok, list, len, " ");

			tok = strtok_s(nullptr, " ", &saveptr);
		}
	}
	free(config);

	if (list)
	{
		if (strlen(list) > 0)
		{
			WLog_Print(rdp->log, WLOG_WARN, "*************************************************");
			WLog_Print(rdp->log, WLOG_WARN, "This build is using [%s] build options:", what);

			char* saveptr = nullptr;
			char* tok = strtok_s(list, " ", &saveptr);
			while (tok)
			{
				WLog_Print(rdp->log, WLOG_WARN, "* '%s'", tok);
				tok = strtok_s(nullptr, " ", &saveptr);
			}
			WLog_Print(rdp->log, WLOG_WARN, "*");
			WLog_Print(rdp->log, WLOG_WARN, "[%s] build options %s", what, msg);
			WLog_Print(rdp->log, WLOG_WARN, "*************************************************");
		}
	}
	free(list);
}

#define print_first_line(log, firstLine, what) \
	print_first_line_int((log), (firstLine), (what), __FILE__, __func__, __LINE__)
static void print_first_line_int(wLog* log, log_line_t* firstLine, const char* what,
                                 const char* file, const char* fkt, size_t line)
{
	WINPR_ASSERT(firstLine);
	if (!firstLine->fkt)
	{
		const DWORD level = WLOG_WARN;
		if (WLog_IsLevelActive(log, level))
		{
			WLog_PrintTextMessage(log, level, line, file, fkt,
			                      "*************************************************");
			WLog_PrintTextMessage(log, level, line, file, fkt,
			                      "[SSL] {%s} build or configuration missing:", what);
		}
		firstLine->line = line;
		firstLine->file = file;
		firstLine->fkt = fkt;
		firstLine->level = level;
	}
}

static void print_last_line(wLog* log, const log_line_t* firstLine)
{
	WINPR_ASSERT(firstLine);
	if (firstLine->fkt)
	{
		if (WLog_IsLevelActive(log, firstLine->level))
			WLog_PrintTextMessage(log, firstLine->level, firstLine->line, firstLine->file,
			                      firstLine->fkt,
			                      "*************************************************");
	}
}

static void log_build_warn_cipher(rdpRdp* rdp, log_line_t* firstLine, WINPR_CIPHER_TYPE md,
                                  const char* what, BOOL allowFIPS)
{
	BOOL haveCipher = FALSE;

	char key[WINPR_CIPHER_MAX_KEY_LENGTH] = WINPR_C_ARRAY_INIT;
	char iv[WINPR_CIPHER_MAX_IV_LENGTH] = WINPR_C_ARRAY_INIT;

	/* RC4 only exists in the compatibility functions winpr_RC4_*
	 * winpr_Cipher_* does not support that. */
	if (md == WINPR_CIPHER_ARC4_128)
	{
		WINPR_RC4_CTX* enc = nullptr;
		if (allowFIPS)
			enc = winpr_RC4_New_Allow_FIPS(key, sizeof(key));
		else
			enc = winpr_RC4_New(key, sizeof(key));
		haveCipher = enc != nullptr;
		winpr_RC4_Free(enc);
	}
	else
	{
		WINPR_CIPHER_CTX* enc =
		    winpr_Cipher_NewEx(md, WINPR_ENCRYPT, key, sizeof(key), iv, sizeof(iv));
		WINPR_CIPHER_CTX* dec =
		    winpr_Cipher_NewEx(md, WINPR_DECRYPT, key, sizeof(key), iv, sizeof(iv));
		if (enc && dec)
			haveCipher = TRUE;

		winpr_Cipher_Free(enc);
		winpr_Cipher_Free(dec);
	}

	if (!haveCipher)
	{
		print_first_line(rdp->log, firstLine, "Cipher");
		WLog_Print(rdp->log, WLOG_WARN, "* %s: %s", winpr_cipher_type_to_string(md), what);
	}
}

static void log_build_warn_hmac(rdpRdp* rdp, log_line_t* firstLine, WINPR_MD_TYPE md,
                                const char* what)
{
	BOOL haveHmacX = FALSE;
	WINPR_HMAC_CTX* hmac = winpr_HMAC_New();
	if (hmac)
	{
		/* We need some key length, but there is no real limit here.
		 * just take the cipher maximum key length as we already have that available.
		 */
		char key[WINPR_CIPHER_MAX_KEY_LENGTH] = WINPR_C_ARRAY_INIT;
		haveHmacX = winpr_HMAC_Init(hmac, md, key, sizeof(key));
	}
	winpr_HMAC_Free(hmac);

	if (!haveHmacX)
	{
		print_first_line(rdp->log, firstLine, "HMAC");
		WLog_Print(rdp->log, WLOG_WARN, " * %s: %s", winpr_md_type_to_string(md), what);
	}
}

static void log_build_warn_hash(rdpRdp* rdp, log_line_t* firstLine, WINPR_MD_TYPE md,
                                const char* what, BOOL allowFIPS)
{
	BOOL haveDigestX = FALSE;
	WINPR_DIGEST_CTX* digest = winpr_Digest_New();
	if (digest)
	{
		if (allowFIPS)
			haveDigestX = winpr_Digest_Init_Allow_FIPS(digest, md);
		else
			haveDigestX = winpr_Digest_Init(digest, md);
	}
	winpr_Digest_Free(digest);

	if (!haveDigestX)
	{
		print_first_line(rdp->log, firstLine, "Digest");
		WLog_Print(rdp->log, WLOG_WARN, " * %s: %s", winpr_md_type_to_string(md), what);
	}
}

static void log_build_warn_ssl(rdpRdp* rdp)
{
	WINPR_ASSERT(rdp);

	const BOOL fips = winpr_FIPSMode();

	if (fips)
	{
		WLog_Print(rdp->log, WLOG_INFO,
		           "FIPS mode active: non-approved algorithms are unavailable "
		           "as expected. NTLM, autoreconnect cookies, assistance files "
		           "with encrypted passwords and RDP security will not work.");
	}

	log_line_t firstHashLine = WINPR_C_ARRAY_INIT;
	if (!fips)
	{
		log_build_warn_hash(rdp, &firstHashLine, WINPR_MD_MD4, "NTLM support not available", FALSE);
		log_build_warn_hash(rdp, &firstHashLine, WINPR_MD_MD5,
		                    "NTLM, assistance files with encrypted passwords "
		                    " and autoreconnect cookies will not work",
		                    FALSE);
	}
	log_build_warn_hash(rdp, &firstHashLine, WINPR_MD_MD5,
	                    "RDP licensing and RDP security will not work", TRUE);
	log_build_warn_hash(rdp, &firstHashLine, WINPR_MD_SHA1,
	                    "assistance files with encrypted passwords, Kerberos, Smartcard Logon, RDP "
	                    "security support not available",
	                    FALSE);
	log_build_warn_hash(rdp, &firstHashLine, WINPR_MD_SHA256,
	                    "file clipboard, AAD gateway, NLA security and certificates might not work",
	                    FALSE);
	print_last_line(rdp->log, &firstHashLine);

	if (!fips)
	{
		log_line_t firstHmacLine = WINPR_C_ARRAY_INIT;
		log_build_warn_hmac(rdp, &firstHmacLine, WINPR_MD_MD5,
		                    "Autoreconnect cookie not supported");
		log_build_warn_hmac(rdp, &firstHmacLine, WINPR_MD_SHA1, "RDP security not supported");
		print_last_line(rdp->log, &firstHmacLine);
	}

	log_line_t firstCipherLine = WINPR_C_ARRAY_INIT;
	if (!fips)
	{
		log_build_warn_cipher(rdp, &firstCipherLine, WINPR_CIPHER_ARC4_128,
		                      "assistance files with encrypted passwords, NTLM "
		                      "and autoreconnect cookies will not work",
		                      FALSE);
	}
	log_build_warn_cipher(rdp, &firstCipherLine, WINPR_CIPHER_ARC4_128,
	                      "RDP licensing and RDP security will not work", TRUE);
	if (!fips)
		log_build_warn_cipher(rdp, &firstCipherLine, WINPR_CIPHER_DES_EDE3_CBC,
		                      "RDP security will not work", TRUE);
	log_build_warn_cipher(
	    rdp, &firstCipherLine, WINPR_CIPHER_AES_128_CBC,
	    "assistance file encrypted LHTicket will not work and ARM gateway might not", FALSE);
	log_build_warn_cipher(rdp, &firstCipherLine, WINPR_CIPHER_AES_192_CBC,
	                      "ARM gateway might not work", FALSE);
	log_build_warn_cipher(rdp, &firstCipherLine, WINPR_CIPHER_AES_256_CBC,
	                      "ARM gateway might not work", FALSE);
	print_last_line(rdp->log, &firstCipherLine);
}

void rdp_log_build_warnings(rdpRdp* rdp)
{
	static unsigned count = 0;

	WINPR_ASSERT(rdp);
	/* Since this function is called in context creation routines stop logging
	 * this issue repeatedly. This is required for proxy, which would otherwise
	 * spam the log with these. */
	if (count > 0)
		return;
	count++;
	log_build_warn(rdp, "experimental", "might crash the application", option_is_experimental);
	log_build_warn(rdp, "debug", "might leak sensitive information (credentials, ...)",
	               option_is_debug);
	log_build_warn(rdp, "runtime-check", "might slow down the application",
	               option_is_runtime_checks);
	log_build_warn_ssl(rdp);
}

size_t rdp_get_event_handles(rdpRdp* rdp, HANDLE* handles, uint32_t count)
{
	size_t nCount = transport_get_event_handles(rdp->transport, handles, count);

	if (nCount == 0)
		return 0;

	if (count < nCount + 2UL)
		return 0;

	handles[nCount++] = utils_get_abort_event(rdp);
	handles[nCount++] = freerdp_timer_get_event(rdp->timer);
	return nCount;
}
