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/*
LUFA Library
Copyright (C) Dean Camera, 2010.
dean [at] fourwalledcubicle [dot] com
www.fourwalledcubicle.com
*/
/*
Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
without fee, provided that the above copyright notice appear in
all copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the name of the author not be used in
advertising or publicity pertaining to distribution of the
software without specific, written prior permission.
The author disclaim all warranties with regard to this
software, including all implied warranties of merchantability
and fitness. In no event shall the author be liable for any
special, indirect or consequential damages or any damages
whatsoever resulting from loss of use, data or profits, whether
in an action of contract, negligence or other tortious action,
arising out of or in connection with the use or performance of
this software.
*/
#define INCLUDE_FROM_SERVICEDISCOVERYPROTOCOL_C
#include "ServiceDiscoveryProtocol.h"
/** Service Discovery Protocol attribute, indicationg the service's name. */
SERVICE_ATTRIBUTE_TEXT(SDP_Attribute_Name, "SDP");
/** Service Discovery Protocol attribute, indicationg the service's description. */
SERVICE_ATTRIBUTE_TEXT(SDP_Attribute_Description, "BT Service Discovery");
/** Service Discovery Protocol attribute, indicationg the service's availability. */
SERVICE_ATTRIBUTE_LEN8(SDP_Attribute_Availability, SDP_DATATYPE_UnsignedInt, 1, {0xFF});
/** Service Discovery Protocol attribute table, listing all supported attributes of the service. */
const ServiceAttributeTable_t SDP_Attribute_Table[] PROGMEM =
{
{.AttributeID = SDP_ATTRIBUTE_NAME , .Data = &SDP_Attribute_Name},
{.AttributeID = SDP_ATTRIBUTE_DESCRIPTION , .Data = &SDP_Attribute_Description},
{.AttributeID = SDP_ATTRIBUTE_AVAILABILITY, .Data = &SDP_Attribute_Availability},
SERVICE_ATTRIBUTE_TABLE_TERMINATOR
};
/** RFCOMM Service attribute, indicationg the service's name. */
SERVICE_ATTRIBUTE_TEXT(RFCOMM_Attribute_Name, "RFCOMM");
/** RFCOMM Service attribute, indicationg the service's description. */
SERVICE_ATTRIBUTE_TEXT(RFCOMM_Attribute_Description, "Virtual Serial");
/** RFCOMM Service attribute, indicationg the service's availability. */
SERVICE_ATTRIBUTE_LEN8(RFCOMM_Attribute_Availability, SDP_DATATYPE_UnsignedInt, 1, {0xFF});
/** RFCOMM Service attribute table, listing all supported attributes of the service. */
const ServiceAttributeTable_t RFCOMM_Attribute_Table[] PROGMEM =
{
{.AttributeID = SDP_ATTRIBUTE_NAME , .Data = &RFCOMM_Attribute_Name},
{.AttributeID = SDP_ATTRIBUTE_DESCRIPTION , .Data = &RFCOMM_Attribute_Description},
{.AttributeID = SDP_ATTRIBUTE_AVAILABILITY, .Data = &RFCOMM_Attribute_Availability},
SERVICE_ATTRIBUTE_TABLE_TERMINATOR
};
/** Master service table, listing all supported services (and their attribute tables) of the device, including
* each service's UUID.
*/
const ServiceTable_t SDP_Services_Table[] PROGMEM =
{
{ // 128-bit UUID for the SDP service
.UUID = {BASE_96BIT_UUID, 0x01, 0x00, 0x00, 0x00},
.AttributeTable = &SDP_Attribute_Table,
},
{ // 128-bit UUID for the RFCOMM service
.UUID = {BASE_96BIT_UUID, 0x03, 0x00, 0x00, 0x00},
.AttributeTable = &RFCOMM_Attribute_Table,
},
};
/** Base UUID value common to all standardized Bluetooth services */
const uint8_t BaseUUID[] PROGMEM = {BASE_96BIT_UUID, 0x00, 0x00, 0x00, 0x00};
/** Main Service Discovery Protocol packet processing routine. This function processes incomming SDP packets from
* a connected Bluetooth device, and sends back appropriate responses to allow other devices to determine the
* services the local device exposes.
*
* \param[in] Data Incomming packet data containing the SDP request
* \param[in] Channel Channel the request was issued to by the remote device
*/
void ServiceDiscovery_ProcessPacket(void* Data, Bluetooth_Channel_t* Channel)
{
SDP_PDUHeader_t* SDPHeader = (SDP_PDUHeader_t*)Data;
SDPHeader->ParameterLength = SwapEndian_16(SDPHeader->ParameterLength);
BT_SDP_DEBUG(1, "SDP Packet Received");
BT_SDP_DEBUG(2, "-- PDU ID: 0x%02X", SDPHeader->PDU);
BT_SDP_DEBUG(2, "-- Param Length: 0x%04X", SDPHeader->ParameterLength);
switch (SDPHeader->PDU)
{
case SDP_PDU_SERVICESEARCHREQUEST:
ServiceDiscovery_ProcessServiceSearch(SDPHeader, Channel);
break;
case SDP_PDU_SERVICEATTRIBUTEREQUEST:
ServiceDiscovery_ProcessServiceAttribute(SDPHeader, Channel);
break;
case SDP_PDU_SERVICESEARCHATTRIBUTEREQUEST:
ServiceDiscovery_ProcessServiceSearchAttribute(SDPHeader, Channel);
break;
}
}
static void ServiceDiscovery_ProcessServiceSearch(SDP_PDUHeader_t* SDPHeader, Bluetooth_Channel_t* Channel)
{
BT_SDP_DEBUG(1, "<< Service Search");
}
static void ServiceDiscovery_ProcessServiceAttribute(SDP_PDUHeader_t* SDPHeader, Bluetooth_Channel_t* Channel)
{
BT_SDP_DEBUG(1, "<< Service Attribute");
}
static void ServiceDiscovery_ProcessServiceSearchAttribute(SDP_PDUHeader_t* SDPHeader, Bluetooth_Channel_t* Channel)
{
const void* CurrentParameter = ((void*)SDPHeader + sizeof(SDP_PDUHeader_t));
BT_SDP_DEBUG(1, "<< Service Search Attribute");
uint8_t UUIDList[12][UUID_SIZE_BYTES];
uint8_t TotalUUIDs = ServiceDiscovery_GetUUIDList(UUIDList, &CurrentParameter);
BT_SDP_DEBUG(2, "-- Total UUIDs: %d", TotalUUIDs);
uint16_t MaxAttributeSize = ServiceDiscovery_Read16BitParameter(&CurrentParameter);
BT_SDP_DEBUG(2, "-- Max Return Attribute Bytes: 0x%04X", MaxAttributeSize);
uint16_t AttributeList[20][2];
uint8_t TotalAttributes = ServiceDiscovery_GetAttributeList(AttributeList, &CurrentParameter);
BT_SDP_DEBUG(2, "-- Total Attributes: %d", TotalAttributes);
struct
{
SDP_PDUHeader_t SDPHeader;
uint16_t AttributeListByteCount;
uint8_t ResponseData[100];
} ResponsePacket;
uint8_t* CurrResponsePos = ResponsePacket.ResponseData;
if (MaxAttributeSize > sizeof(ResponsePacket.ResponseData))
MaxAttributeSize = sizeof(ResponsePacket.ResponseData);
uint16_t* TotalResponseSize = ServiceDiscovery_AddDataElementHeader(&CurrResponsePos, SDP_DATATYPE_Sequence);
for (uint8_t CurrUUIDItem = 0; CurrUUIDItem < TotalUUIDs; CurrUUIDItem++)
{
ServiceAttributeTable_t* AttributeTable = ServiceDiscovery_GetAttributeTable(UUIDList[CurrUUIDItem]);
if (AttributeTable == NULL)
continue;
uint16_t* CurrentUUIDResponseSize = ServiceDiscovery_AddDataElementHeader(&CurrResponsePos, SDP_DATATYPE_Sequence);
*TotalResponseSize += sizeof(ServiceAttributeData16Bit_t);
for (uint8_t CurrAttribute = 0; CurrAttribute < TotalAttributes; CurrAttribute++)
{
uint16_t* AttributeIDRange = AttributeList[CurrAttribute];
for (uint16_t CurrAttributeID = AttributeIDRange[0]; CurrAttributeID < AttributeIDRange[1]; CurrAttributeID++)
{
void* AttributeValue = ServiceDiscovery_GetAttributeValue(AttributeTable, CurrAttributeID);
if (AttributeValue == NULL)
continue;
BT_SDP_DEBUG(2, "GUID + ATTRIBUTE FOUND");
}
}
}
ResponsePacket.AttributeListByteCount = (*TotalResponseSize + sizeof(ServiceAttributeData16Bit_t));
ResponsePacket.SDPHeader.PDU = SDP_PDU_SERVICESEARCHATTRIBUTERESPONSE;
ResponsePacket.SDPHeader.TransactionID = SDPHeader->TransactionID;
ResponsePacket.SDPHeader.ParameterLength = (ResponsePacket.AttributeListByteCount + sizeof(ResponsePacket.AttributeListByteCount));
Bluetooth_SendPacket(&ResponsePacket, (sizeof(ResponsePacket.SDPHeader) + ResponsePacket.SDPHeader.ParameterLength),
Channel);
}
static void* ServiceDiscovery_GetAttributeValue(ServiceAttributeTable_t* AttributeTable, uint16_t AttributeID)
{
while ((void*)pgm_read_word(&AttributeTable->Data) != NULL)
{
if (pgm_read_word(&AttributeTable->AttributeID) == AttributeID)
return &AttributeTable->Data;
AttributeTable++;
}
return NULL;
}
static ServiceAttributeTable_t* ServiceDiscovery_GetAttributeTable(uint8_t* UUID)
{
for (uint8_t CurrTableItem = 0; CurrTableItem < (sizeof(SDP_Services_Table) / sizeof(ServiceTable_t)); CurrTableItem++)
{
if (!(memcmp_P(UUID, SDP_Services_Table[CurrTableItem].UUID, UUID_SIZE_BYTES)))
return (ServiceAttributeTable_t*)pgm_read_word(&SDP_Services_Table[CurrTableItem].AttributeTable);
}
return NULL;
}
static uint8_t ServiceDiscovery_GetAttributeList(uint16_t AttributeList[][2], const void** CurrentParameter)
{
uint8_t ElementHeaderSize;
uint8_t TotalAttributes = 0;
uint16_t AttributeIDListLength = ServiceDiscovery_GetDataElementSize(CurrentParameter, &ElementHeaderSize);
BT_SDP_DEBUG(2, "-- Total Attribute Length: 0x%04X", AttributeIDListLength);
while (AttributeIDListLength)
{
uint8_t AttributeLength = ServiceDiscovery_GetDataElementSize(CurrentParameter, &ElementHeaderSize);
memcpy(&AttributeList[TotalAttributes][0], *CurrentParameter, AttributeLength);
if (AttributeLength == 2)
memcpy(&AttributeList[TotalAttributes][1], *CurrentParameter, 2);
BT_SDP_DEBUG(2, "-- Attribute: 0x%04X-0x%04X", AttributeList[TotalAttributes][0], AttributeList[TotalAttributes][1]);
TotalAttributes++;
AttributeIDListLength -= (AttributeLength + ElementHeaderSize);
*CurrentParameter += AttributeLength;
}
return TotalAttributes;
}
static uint8_t ServiceDiscovery_GetUUIDList(uint8_t UUIDList[][UUID_SIZE_BYTES], const void** CurrentParameter)
{
uint8_t ElementHeaderSize;
uint8_t TotalUUIDs = 0;
uint16_t ServicePatternLength = ServiceDiscovery_GetDataElementSize(CurrentParameter, &ElementHeaderSize);
BT_SDP_DEBUG(2, "-- Total UUID Length: 0x%04X", ServicePatternLength);
while (ServicePatternLength)
{
uint8_t* CurrentUUID = UUIDList[TotalUUIDs++];
uint8_t UUIDLength = ServiceDiscovery_GetDataElementSize(CurrentParameter, &ElementHeaderSize);
memcpy_P(CurrentUUID, BaseUUID, sizeof(BaseUUID));
memcpy(&CurrentUUID[(UUIDLength <= 4) ? (UUID_SIZE_BYTES - 4) : 0], *CurrentParameter, UUIDLength);
BT_SDP_DEBUG(2, "-- UUID (%d): 0x%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
UUIDLength,
CurrentUUID[15], CurrentUUID[14], CurrentUUID[13], CurrentUUID[12],
CurrentUUID[11], CurrentUUID[10], CurrentUUID[9], CurrentUUID[8],
CurrentUUID[7], CurrentUUID[6], CurrentUUID[5], CurrentUUID[4],
CurrentUUID[3], CurrentUUID[2], CurrentUUID[1], CurrentUUID[0]);
ServicePatternLength -= (UUIDLength + ElementHeaderSize);
*CurrentParameter += UUIDLength;
}
return TotalUUIDs;
}
static uint32_t ServiceDiscovery_GetDataElementSize(const void** DataElementHeader, uint8_t* ElementHeaderSize)
{
/* Fetch the size of the Data Element structure from the header, increment the current buffer pos */
uint8_t SizeIndex = (*((uint8_t*)*DataElementHeader) & 0x07);
*DataElementHeader += sizeof(uint8_t);
uint32_t ElementValue;
/* Convert the Data Element size index into a size in bytes */
switch (SizeIndex)
{
case 5:
ElementValue = *((uint8_t*)*DataElementHeader);
*DataElementHeader += sizeof(uint8_t);
*ElementHeaderSize = (1 + sizeof(uint8_t));
break;
case 6:
ElementValue = *((uint16_t*)*DataElementHeader);
*DataElementHeader += sizeof(uint16_t);
*ElementHeaderSize = (1 + sizeof(uint16_t));
break;
case 7:
ElementValue = *((uint32_t*)*DataElementHeader);
*DataElementHeader += sizeof(uint32_t);
*ElementHeaderSize = (1 + sizeof(uint32_t));
break;
default:
ElementValue = (1 << SizeIndex);
*ElementHeaderSize = 1;
break;
}
return ElementValue;
}
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