FreeRDP/libfreerdp/core/gateway/rts_signature.c

/**
 * FreeRDP: A Remote Desktop Protocol Implementation
 * Request To Send (RTS) PDU Signatures
 *
 * Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.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/log.h>

#include "rts_signature.h"

#define TAG FREERDP_TAG("core.gateway.rts")

RtsPduSignature RTS_PDU_CONN_A1_SIGNATURE = { RTS_FLAG_NONE, 4,
	{ RTS_CMD_VERSION, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_RECEIVE_WINDOW_SIZE, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_CONN_A2_SIGNATURE = { RTS_FLAG_OUT_CHANNEL, 5,
	{
		RTS_CMD_VERSION, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_CHANNEL_LIFETIME,
		RTS_CMD_RECEIVE_WINDOW_SIZE, 0, 0, 0
	}
};
RtsPduSignature RTS_PDU_CONN_A3_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_CONNECTION_TIMEOUT, 0, 0, 0, 0, 0, 0, 0 }
};

RtsPduSignature RTS_PDU_CONN_B1_SIGNATURE = { RTS_FLAG_NONE, 6,
	{
		RTS_CMD_VERSION, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_CHANNEL_LIFETIME,
		RTS_CMD_CLIENT_KEEPALIVE, RTS_CMD_ASSOCIATION_GROUP_ID, 0, 0
	}
};
RtsPduSignature RTS_PDU_CONN_B2_SIGNATURE = { RTS_FLAG_IN_CHANNEL, 7,
	{
		RTS_CMD_VERSION, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_RECEIVE_WINDOW_SIZE,
		RTS_CMD_CONNECTION_TIMEOUT, RTS_CMD_ASSOCIATION_GROUP_ID, RTS_CMD_CLIENT_ADDRESS, 0
	}
};
RtsPduSignature RTS_PDU_CONN_B3_SIGNATURE = { RTS_FLAG_NONE, 2,
	{ RTS_CMD_RECEIVE_WINDOW_SIZE, RTS_CMD_VERSION, 0, 0, 0, 0, 0, 0 }
};

RtsPduSignature RTS_PDU_CONN_C1_SIGNATURE = { RTS_FLAG_NONE, 3,
	{ RTS_CMD_VERSION, RTS_CMD_RECEIVE_WINDOW_SIZE, RTS_CMD_CONNECTION_TIMEOUT, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_CONN_C2_SIGNATURE = { RTS_FLAG_NONE, 3,
	{ RTS_CMD_VERSION, RTS_CMD_RECEIVE_WINDOW_SIZE, RTS_CMD_CONNECTION_TIMEOUT, 0, 0, 0, 0, 0 }
};

RtsPduSignature RTS_PDU_IN_R1_A1_SIGNATURE = { RTS_FLAG_RECYCLE_CHANNEL, 4,
	{ RTS_CMD_VERSION, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_COOKIE, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_IN_R1_A2_SIGNATURE = { RTS_FLAG_NONE, 4,
	{
		RTS_CMD_VERSION, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_COOKIE,
		RTS_CMD_RECEIVE_WINDOW_SIZE, RTS_CMD_CONNECTION_TIMEOUT, 0, 0
	}
};
RtsPduSignature RTS_PDU_IN_R1_A3_SIGNATURE = { RTS_FLAG_NONE, 4,
	{
		RTS_CMD_DESTINATION, RTS_CMD_VERSION, RTS_CMD_RECEIVE_WINDOW_SIZE,
		RTS_CMD_CONNECTION_TIMEOUT, 0, 0, 0, 0
	}
};
RtsPduSignature RTS_PDU_IN_R1_A4_SIGNATURE = { RTS_FLAG_NONE, 4,
	{
		RTS_CMD_DESTINATION, RTS_CMD_VERSION, RTS_CMD_RECEIVE_WINDOW_SIZE,
		RTS_CMD_CONNECTION_TIMEOUT, 0, 0, 0, 0
	}
};
RtsPduSignature RTS_PDU_IN_R1_A5_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_COOKIE, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_IN_R1_A6_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_COOKIE, 0, 0, 0, 0, 0, 0, 0 }
};

RtsPduSignature RTS_PDU_IN_R1_B1_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_EMPTY, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_IN_R1_B2_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_RECEIVE_WINDOW_SIZE, 0, 0, 0, 0, 0, 0, 0 }
};

RtsPduSignature RTS_PDU_IN_R2_A1_SIGNATURE = { RTS_FLAG_RECYCLE_CHANNEL, 4,
	{ RTS_CMD_VERSION, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_COOKIE, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_IN_R2_A2_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_COOKIE, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_IN_R2_A3_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_DESTINATION, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_IN_R2_A4_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_DESTINATION, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_IN_R2_A5_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_COOKIE, 0, 0, 0, 0, 0, 0, 0 }
};

RtsPduSignature RTS_PDU_OUT_R1_A1_SIGNATURE = { RTS_FLAG_RECYCLE_CHANNEL, 1,
	{ RTS_CMD_DESTINATION, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R1_A2_SIGNATURE = { RTS_FLAG_RECYCLE_CHANNEL, 1,
	{ RTS_CMD_DESTINATION, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R1_A3_SIGNATURE = { RTS_FLAG_RECYCLE_CHANNEL, 5,
	{
		RTS_CMD_VERSION, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_COOKIE,
		RTS_CMD_RECEIVE_WINDOW_SIZE, 0, 0, 0
	}
};
RtsPduSignature RTS_PDU_OUT_R1_A4_SIGNATURE = { RTS_FLAG_RECYCLE_CHANNEL | RTS_FLAG_OUT_CHANNEL, 7,
	{
		RTS_CMD_VERSION, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_CHANNEL_LIFETIME,
		RTS_CMD_RECEIVE_WINDOW_SIZE, RTS_CMD_CONNECTION_TIMEOUT, 0
	}
};
RtsPduSignature RTS_PDU_OUT_R1_A5_SIGNATURE = { RTS_FLAG_OUT_CHANNEL, 3,
	{ RTS_CMD_DESTINATION, RTS_CMD_VERSION, RTS_CMD_CONNECTION_TIMEOUT, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R1_A6_SIGNATURE = { RTS_FLAG_OUT_CHANNEL, 3,
	{ RTS_CMD_DESTINATION, RTS_CMD_VERSION, RTS_CMD_CONNECTION_TIMEOUT, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R1_A7_SIGNATURE = { RTS_FLAG_OUT_CHANNEL, 2,
	{ RTS_CMD_DESTINATION, RTS_CMD_COOKIE, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R1_A8_SIGNATURE = { RTS_FLAG_OUT_CHANNEL, 2,
	{ RTS_CMD_DESTINATION, RTS_CMD_COOKIE, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R1_A9_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_ANCE, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R1_A10_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_ANCE, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R1_A11_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_ANCE, 0, 0, 0, 0, 0, 0, 0 }
};

RtsPduSignature RTS_PDU_OUT_R2_A1_SIGNATURE = { RTS_FLAG_RECYCLE_CHANNEL, 1,
	{ RTS_CMD_DESTINATION, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R2_A2_SIGNATURE = { RTS_FLAG_RECYCLE_CHANNEL, 1,
	{ RTS_CMD_DESTINATION, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R2_A3_SIGNATURE = { RTS_FLAG_RECYCLE_CHANNEL, 5,
	{
		RTS_CMD_VERSION, RTS_CMD_COOKIE, RTS_CMD_COOKIE, RTS_CMD_COOKIE,
		RTS_CMD_RECEIVE_WINDOW_SIZE, 0, 0, 0
	}
};
RtsPduSignature RTS_PDU_OUT_R2_A4_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_COOKIE, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R2_A5_SIGNATURE = { RTS_FLAG_NONE, 2,
	{ RTS_CMD_DESTINATION, RTS_CMD_ANCE, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R2_A6_SIGNATURE = { RTS_FLAG_NONE, 2,
	{ RTS_CMD_DESTINATION, RTS_CMD_ANCE, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R2_A7_SIGNATURE = { RTS_FLAG_NONE, 3,
	{ RTS_CMD_DESTINATION, RTS_CMD_COOKIE, RTS_CMD_VERSION, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R2_A8_SIGNATURE = { RTS_FLAG_OUT_CHANNEL, 2,
	{ RTS_CMD_DESTINATION, RTS_CMD_COOKIE, 0, 0, 0, 0, 0, 0 }
};

RtsPduSignature RTS_PDU_OUT_R2_B1_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_ANCE, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R2_B2_SIGNATURE = { RTS_FLAG_NONE, 1,
	{ RTS_CMD_NEGATIVE_ANCE, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_OUT_R2_B3_SIGNATURE = { RTS_FLAG_EOF, 1,
	{ RTS_CMD_ANCE, 0, 0, 0, 0, 0, 0, 0 }
};

RtsPduSignature RTS_PDU_OUT_R2_C1_SIGNATURE = { RTS_FLAG_PING, 1,
	{ 0, 0, 0, 0, 0, 0, 0, 0 }
};

RtsPduSignature RTS_PDU_KEEP_ALIVE_SIGNATURE = { RTS_FLAG_OTHER_CMD, 1,
	{ RTS_CMD_CLIENT_KEEPALIVE, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_PING_TRAFFIC_SENT_NOTIFY_SIGNATURE = { RTS_FLAG_OTHER_CMD, 1,
	{ RTS_CMD_PING_TRAFFIC_SENT_NOTIFY, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_ECHO_SIGNATURE = { RTS_FLAG_ECHO, 0,
	{ 0, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_PING_SIGNATURE = { RTS_FLAG_PING, 0,
	{ 0, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_FLOW_CONTROL_ACK_SIGNATURE = { RTS_FLAG_OTHER_CMD, 1,
	{ RTS_CMD_FLOW_CONTROL_ACK, 0, 0, 0, 0, 0, 0, 0 }
};
RtsPduSignature RTS_PDU_FLOW_CONTROL_ACK_WITH_DESTINATION_SIGNATURE = { RTS_FLAG_OTHER_CMD, 2,
	{ RTS_CMD_DESTINATION, RTS_CMD_FLOW_CONTROL_ACK, 0, 0, 0, 0, 0, 0 }
};

static const RTS_PDU_SIGNATURE_ENTRY RTS_PDU_SIGNATURE_TABLE[] =
{
	{ RTS_PDU_CONN_A1, FALSE, &RTS_PDU_CONN_A1_SIGNATURE, "CONN/A1" },
	{ RTS_PDU_CONN_A2, FALSE, &RTS_PDU_CONN_A2_SIGNATURE, "CONN/A2" },
	{ RTS_PDU_CONN_A3, TRUE, &RTS_PDU_CONN_A3_SIGNATURE, "CONN/A3" },

	{ RTS_PDU_CONN_B1, FALSE, &RTS_PDU_CONN_B1_SIGNATURE, "CONN/B1" },
	{ RTS_PDU_CONN_B2, FALSE, &RTS_PDU_CONN_B2_SIGNATURE, "CONN/B2" },
	{ RTS_PDU_CONN_B3, FALSE, &RTS_PDU_CONN_B3_SIGNATURE, "CONN/B3" },

	{ RTS_PDU_CONN_C1, FALSE, &RTS_PDU_CONN_C1_SIGNATURE, "CONN/C1" },
	{ RTS_PDU_CONN_C2, TRUE, &RTS_PDU_CONN_C2_SIGNATURE, "CONN/C2" },

	{ RTS_PDU_IN_R1_A1, FALSE, &RTS_PDU_IN_R1_A1_SIGNATURE, "IN_R1/A1" },
	{ RTS_PDU_IN_R1_A2, FALSE, &RTS_PDU_IN_R1_A2_SIGNATURE, "IN_R1/A2" },
	{ RTS_PDU_IN_R1_A3, FALSE, &RTS_PDU_IN_R1_A3_SIGNATURE, "IN_R1/A3" },
	{ RTS_PDU_IN_R1_A4, TRUE, &RTS_PDU_IN_R1_A4_SIGNATURE, "IN_R1/A4" },
	{ RTS_PDU_IN_R1_A5, TRUE, &RTS_PDU_IN_R1_A5_SIGNATURE, "IN_R1/A5" },
	{ RTS_PDU_IN_R1_A6, FALSE, &RTS_PDU_IN_R1_A6_SIGNATURE, "IN_R1/A6" },

	{ RTS_PDU_IN_R1_B1, FALSE, &RTS_PDU_IN_R1_B1_SIGNATURE, "IN_R1/B1" },
	{ RTS_PDU_IN_R1_B2, FALSE, &RTS_PDU_IN_R1_B2_SIGNATURE, "IN_R1/B2" },

	{ RTS_PDU_IN_R2_A1, FALSE, &RTS_PDU_IN_R2_A1_SIGNATURE, "IN_R2/A1" },
	{ RTS_PDU_IN_R2_A2, FALSE, &RTS_PDU_IN_R2_A2_SIGNATURE, "IN_R2/A2" },
	{ RTS_PDU_IN_R2_A3, FALSE, &RTS_PDU_IN_R2_A3_SIGNATURE, "IN_R2/A3" },
	{ RTS_PDU_IN_R2_A4, TRUE, &RTS_PDU_IN_R2_A4_SIGNATURE, "IN_R2/A4" },
	{ RTS_PDU_IN_R2_A5, FALSE, &RTS_PDU_IN_R2_A5_SIGNATURE, "IN_R2/A5" },

	{ RTS_PDU_OUT_R1_A1, FALSE, &RTS_PDU_OUT_R1_A1_SIGNATURE, "OUT_R1/A1" },
	{ RTS_PDU_OUT_R1_A2, TRUE, &RTS_PDU_OUT_R1_A2_SIGNATURE, "OUT_R1/A2" },
	{ RTS_PDU_OUT_R1_A3, FALSE, &RTS_PDU_OUT_R1_A3_SIGNATURE, "OUT_R1/A3" },
	{ RTS_PDU_OUT_R1_A4, FALSE, &RTS_PDU_OUT_R1_A4_SIGNATURE, "OUT_R1/A4" },
	{ RTS_PDU_OUT_R1_A5, FALSE, &RTS_PDU_OUT_R1_A5_SIGNATURE, "OUT_R1/A5" },
	{ RTS_PDU_OUT_R1_A6, TRUE, &RTS_PDU_OUT_R1_A6_SIGNATURE, "OUT_R1/A6" },
	{ RTS_PDU_OUT_R1_A7, FALSE, &RTS_PDU_OUT_R1_A7_SIGNATURE, "OUT_R1/A7" },
	{ RTS_PDU_OUT_R1_A8, FALSE, &RTS_PDU_OUT_R1_A8_SIGNATURE, "OUT_R1/A8" },
	{ RTS_PDU_OUT_R1_A9, FALSE, &RTS_PDU_OUT_R1_A9_SIGNATURE, "OUT_R1/A9" },
	{ RTS_PDU_OUT_R1_A10, TRUE, &RTS_PDU_OUT_R1_A10_SIGNATURE, "OUT_R1/A10" },
	{ RTS_PDU_OUT_R1_A11, FALSE, &RTS_PDU_OUT_R1_A11_SIGNATURE, "OUT_R1/A11" },

	{ RTS_PDU_OUT_R2_A1, FALSE, &RTS_PDU_OUT_R2_A1_SIGNATURE, "OUT_R2/A1" },
	{ RTS_PDU_OUT_R2_A2, TRUE, &RTS_PDU_OUT_R2_A2_SIGNATURE, "OUT_R2/A2" },
	{ RTS_PDU_OUT_R2_A3, FALSE, &RTS_PDU_OUT_R2_A3_SIGNATURE, "OUT_R2/A3" },
	{ RTS_PDU_OUT_R2_A4, FALSE, &RTS_PDU_OUT_R2_A4_SIGNATURE, "OUT_R2/A4" },
	{ RTS_PDU_OUT_R2_A5, FALSE, &RTS_PDU_OUT_R2_A5_SIGNATURE, "OUT_R2/A5" },
	{ RTS_PDU_OUT_R2_A6, TRUE, &RTS_PDU_OUT_R2_A6_SIGNATURE, "OUT_R2/A6" },
	{ RTS_PDU_OUT_R2_A7, FALSE, &RTS_PDU_OUT_R2_A7_SIGNATURE, "OUT_R2/A7" },
	{ RTS_PDU_OUT_R2_A8, FALSE, &RTS_PDU_OUT_R2_A8_SIGNATURE, "OUT_R2/A8" },

	{ RTS_PDU_OUT_R2_B1, FALSE, &RTS_PDU_OUT_R2_B1_SIGNATURE, "OUT_R2/B1" },
	{ RTS_PDU_OUT_R2_B2, FALSE, &RTS_PDU_OUT_R2_B2_SIGNATURE, "OUT_R2/B2" },
	{ RTS_PDU_OUT_R2_B3, TRUE, &RTS_PDU_OUT_R2_B3_SIGNATURE, "OUT_R2/B3" },

	{ RTS_PDU_OUT_R2_C1, FALSE, &RTS_PDU_OUT_R2_C1_SIGNATURE, "OUT_R2/C1" },

	{ RTS_PDU_KEEP_ALIVE, TRUE, &RTS_PDU_KEEP_ALIVE_SIGNATURE, "Keep-Alive" },
	{ RTS_PDU_PING_TRAFFIC_SENT_NOTIFY, TRUE, &RTS_PDU_PING_TRAFFIC_SENT_NOTIFY_SIGNATURE, "Ping Traffic Sent Notify" },
	{ RTS_PDU_ECHO, TRUE, &RTS_PDU_ECHO_SIGNATURE, "Echo" },
	{ RTS_PDU_PING, TRUE, &RTS_PDU_PING_SIGNATURE, "Ping" },
	{ RTS_PDU_FLOW_CONTROL_ACK, TRUE, &RTS_PDU_FLOW_CONTROL_ACK_SIGNATURE, "FlowControlAck" },
	{ RTS_PDU_FLOW_CONTROL_ACK_WITH_DESTINATION, TRUE, &RTS_PDU_FLOW_CONTROL_ACK_WITH_DESTINATION_SIGNATURE, "FlowControlAckWithDestination" },

	{ 0, 0, NULL }
};

BOOL rts_match_pdu_signature(rdpRpc* rpc, RtsPduSignature* signature, rpcconn_rts_hdr_t* rts)
{
	int i;
	int status;
	BYTE* buffer;
	UINT32 length;
	UINT32 offset;
	UINT32 CommandType;
	UINT32 CommandLength;

	if (rts->Flags != signature->Flags)
		return FALSE;

	if (rts->NumberOfCommands != signature->NumberOfCommands)
		return FALSE;

	buffer = (BYTE*) rts;
	offset = RTS_PDU_HEADER_LENGTH;
	length = rts->frag_length - offset;

	for (i = 0; i < rts->NumberOfCommands; i++)
	{
		CommandType = *((UINT32*) &buffer[offset]); /* CommandType (4 bytes) */
		offset += 4;

		if (CommandType != signature->CommandTypes[i])
			return FALSE;

		status = rts_command_length(rpc, CommandType, &buffer[offset], length);

		if (status < 0)
			return FALSE;

		CommandLength = (UINT32) status;
		offset += CommandLength;
		length = rts->frag_length - offset;
	}

	return TRUE;
}

int rts_extract_pdu_signature(rdpRpc* rpc, RtsPduSignature* signature, rpcconn_rts_hdr_t* rts)
{
	int i;
	int status;
	BYTE* buffer;
	UINT32 length;
	UINT32 offset;
	UINT32 CommandType;
	UINT32 CommandLength;
	signature->Flags = rts->Flags;
	signature->NumberOfCommands = rts->NumberOfCommands;
	buffer = (BYTE*) rts;
	offset = RTS_PDU_HEADER_LENGTH;
	length = rts->frag_length - offset;

	for (i = 0; i < rts->NumberOfCommands; i++)
	{
		CommandType = *((UINT32*) &buffer[offset]); /* CommandType (4 bytes) */
		offset += 4;
		signature->CommandTypes[i] = CommandType;
		status = rts_command_length(rpc, CommandType, &buffer[offset], length);

		if (status < 0)
			return FALSE;

		CommandLength = (UINT32) status;
		offset += CommandLength;
		length = rts->frag_length - offset;
	}

	return 0;
}

UINT32 rts_identify_pdu_signature(rdpRpc* rpc, RtsPduSignature* signature,
                                  const RTS_PDU_SIGNATURE_ENTRY** entry)
{
	int i, j;
	RtsPduSignature* pSignature;

	for (i = 0; RTS_PDU_SIGNATURE_TABLE[i].SignatureId != 0; i++)
	{
		pSignature = RTS_PDU_SIGNATURE_TABLE[i].Signature;

		if (!RTS_PDU_SIGNATURE_TABLE[i].SignatureClient)
			continue;

		if (signature->Flags != pSignature->Flags)
			continue;

		if (signature->NumberOfCommands != pSignature->NumberOfCommands)
			continue;

		for (j = 0; j < signature->NumberOfCommands; j++)
		{
			if (signature->CommandTypes[j] != pSignature->CommandTypes[j])
				continue;
		}

		if (entry)
			*entry = &RTS_PDU_SIGNATURE_TABLE[i];

		return RTS_PDU_SIGNATURE_TABLE[i].SignatureId;
	}

	return 0;
}

int rts_print_pdu_signature(rdpRpc* rpc, RtsPduSignature* signature)
{
	UINT32 SignatureId;
	const RTS_PDU_SIGNATURE_ENTRY* entry;
	WLog_INFO(TAG,  "RTS PDU Signature: Flags: 0x%04"PRIX16" NumberOfCommands: %"PRIu16"",
	          signature->Flags, signature->NumberOfCommands);
	SignatureId = rts_identify_pdu_signature(rpc, signature, &entry);

	if (SignatureId)
		WLog_ERR(TAG,  "Identified %s RTS PDU", entry->PduName);

	return 0;
}