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SDP(3)			 BSD Library Functions Manual			SDP(3)

NAME
     SDP_GET8, SDP_GET16, SDP_GET32, SDP_GET64, SDP_GET128, SDP_GET_UUID128,
     SDP_PUT8, SDP_PUT16, SDP_PUT32, SDP_PUT64, SDP_PUT128, SDP_PUT_UUID128,
     sdp_open, sdp_open_local, sdp_close, sdp_error, sdp_search,
     sdp_attr2desc, sdp_uuid2desc — Bluetooth SDP routines

LIBRARY
     library “libsdp”

SYNOPSIS
     #include <bluetooth.h>
     #include <sdp.h>

     SDP_GET8(b, cp);

     SDP_GET16(s, cp);

     SDP_GET32(l, cp);

     SDP_GET64(l, cp);

     SDP_GET128(l, cp);

     SDP_GET_UUID128(l, cp);

     SDP_PUT8(b, cp);

     SDP_PUT16(s, cp);

     SDP_PUT32(l, cp);

     SDP_PUT64(l, cp);

     SDP_PUT128(l, cp);

     SDP_PUT_UUID128(l, cp);

     void *
     sdp_open(bdaddr_t const *l, bdaddr_t const *r);

     void *
     sdp_open_local(char const *control);

     int32_t
     sdp_close(void *xs);

     int32_t
     sdp_error(void *xs);

     int32_t
     sdp_search(void *xs, uint32_t plen, uint16_t const *pp, uint32_t alen,
	 uint32_t const *ap, uint32_t vlen, sdp_attr_t *vp);

     char const * const
     sdp_attr2desc(uint16_t attr);

     char const * const
     sdp_uuid2desc(uint16_t uuid);

     int32_t
     sdp_register_service(void *xss, uint16_t uuid, bdaddr_p const bdaddr,
	 uint8_t const *data, uint32_t datalen, uint32_t *handle);

     int32_t
     sdp_unregister_service(void *xss, uint32_t handle);

     int32_t
     sdp_change_service(void *xss, uint32_t handle, uint8_t const *data,
	 uint32_t datalen);

DESCRIPTION
     The SDP_GET8(), SDP_GET16(), SDP_GET32(), SDP_GET64() and SDP_GET128()
     macros are used to get byte, short, long, long long and 128-bit integer
     from the buffer pointed by cp pointer.  The pointer is automatically
     advanced.

     The SDP_PUT8(), SDP_PUT16(), SDP_PUT32(), SDP_PUT64() and SDP_PUT128()
     macros are used to put byte, short, long, long long and 128-bit integer
     into the buffer pointed by cp pointer.  The pointer is automatically
     advanced.

     SDP_GET_UUID128() and SDP_PUT_UUID128() macros are used to get and put
     128-bit UUID into the buffer pointed by cp pointer.  The pointer is auto‐
     matically advanced.

     The sdp_open() and sdp_open_local() functions each return a pointer to an
     opaque object describing SDP session.  The l argument passed to
     sdp_open() function should point to a source BD_ADDR.  If source BD_ADDR
     is NULL then source address NG_HCI_BDADDR_ANY is used.  The r argument
     passed to sdp_open() function should point to a non-NULL remote BD_ADDR.
     Remote BD_ADDR cannot be NG_HCI_BDADDR_ANY.  The sdp_open_local() func‐
     tion takes path to the control socket and opens a connection to a local
     SDP server.  If path to the control socket is NULL then default
     /var/run/sdp path will be used.

     The sdp_close() function terminates active SDP session and deletes SDP
     session object.  The xs parameter should point to a valid SDP session
     object created with sdp_open() or sdp_open_local().

     The sdp_error() function returns last error that is stored inside SDP
     session object.  The xs parameter should point to a valid SDP session
     object created with sdp_open() or sdp_open_local().  The error value
     returned can be converted to a human readable message by calling
     strerror(3) function.

     The sdp_search() function is used to perform SDP Service Search Attribute
     Request.  The xs parameter should point to a valid SDP session object
     created with sdp_open() or sdp_open_local().  The pp parameter is a Ser‐
     vice Search Pattern - an array of one or more Service Class IDs.  The
     maximum number of Service Class IDs in the array is 12.  The plen parame‐
     ter is the length of the Service Search pattern.  The ap parameter is an
     Attribute ID Range List - an array of one or more SDP Attribute ID Range.
     Each attribute ID Range is encoded as a 32-bit unsigned integer data ele‐
     ment, where the high order 16 bits are interpreted as the beginning
     attribute ID of the range and the low order 16 bits are interpreted as
     the ending attribute ID of the range.  The attribute IDs contained in the
     Attribute ID Ranges List must be listed in ascending order without dupli‐
     cation of any attribute ID values.	 Note that all attributes may be
     requested by specifying a range of 0x0000-0xFFFF.	The alen parameter is
     the length of the Attribute ID Ranges List.  The SDP_ATTR_RANGE(lo, hi)
     macro can be used to prepare Attribute ID Range.  The vp parameter should
     be an array of sdp_attr_t structures.  Each sdp_attr_t structure
     describes single SDP attribute and defined as follows:

	   struct sdp_attr {
		   uint16_t	   flags;
	   #define SDP_ATTR_OK		   (0 << 0)
	   #define SDP_ATTR_INVALID	   (1 << 0)
	   #define SDP_ATTR_TRUNCATED	   (1 << 1)
		   uint16_t	   attr;  /* SDP_ATTR_xxx */
		   uint32_t	   vlen;  /* length of the value[] in bytes */
		   uint8_t	  *value; /* base pointer */
	   };
	   typedef struct sdp_attr	   sdp_attr_t;
	   typedef struct sdp_attr *	   sdp_attr_p;

     The caller of the sdp_search() function is expected to prepare the array
     of sdp_attr structures and for each element of the array both vlen and
     value must be set.	 The sdp_search() function will fill each sdp_attr_t
     structure with attribute and value, i.e., it will set flags, attr and
     vlen fields.  The actual value of the attribute will be copied into value
     buffer.  Note: attributes are returned in the order they appear in the
     Service Search Attribute Response.	 SDP server could return several
     attributes for the same record.  In this case the order of the attributes
     will be: all attributes for the first records, then all attributes for
     the secord record etc.

     The sdp_attr2desc() and sdp_uuid2desc() functions each take a numeric
     attribute ID/UUID value and convert it to a human readable description.

     The sdp_register_service() function is used to register service with the
     local SDP server.	The xss parameter should point to a valid SDP session
     object obtained from sdp_open_local().  The uuid parameter is a SDP Ser‐
     vice Class ID for the service to be registered.  The bdaddr parameter
     should point to a valid BD_ADDR.  The service will be only advertised if
     request was received by the local device with bdaddr.  If bdaddr is set
     to NG_HCI_BDADDR_ANY then the service will be advertised to any remote
     devices that queries for it.  The data and datalen parameters specify
     data and size of the data for the service.	 Upon successful return
     sdp_register_service() will populate handle with the SDP record handle.
     This parameter is optional and can be set to NULL.

     The sdp_unregister_service() function is used to unregister service with
     the local SDP server.  The xss parameter should point to a valid SDP ses‐
     sion object obtained from sdp_open_local().  The handle parameter should
     contain a valid SDP record handle of the service to be unregistered.

     The sdp_change_service() function is used to change data associated with
     the existing service on the local SDP server.  The xss parameter should
     point to a valid SDP session object obtained from sdp_open_local().  The
     handle parameter should contain a valid SDP record handle of the service
     to be changed.  The data and datalen parameters specify data and size of
     the data for the service.

CAVEAT
     When registering services with the local SDP server the application must
     keep the SDP session open.	 If SDP session is closed then the local SDP
     server will remove all services that were registered over the session.
     The application is allowed to change or unregister service if it was reg‐
     istered over the same session.

EXAMPLES
     The following example shows how to get SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST
     attribute for the SDP_SERVICE_CLASS_SERIAL_PORT service from the remote
     device.

	   bdaddr_t	  remote;
	   uint8_t	  buffer[1024];
	   void		 *ss	= NULL;
	   uint16_t	  serv	= SDP_SERVICE_CLASS_SERIAL_PORT;
	   uint32_t	  attr	= SDP_ATTR_RANGE(
				       SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST,
				       SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST);
	   sdp_attr_t	  proto = { SDP_ATTR_INVALID,0,sizeof(buffer),buffer };

	   /* Obtain/set remote BDADDR here */

	   if ((ss = sdp_open(NG_HCI_BDADDR_ANY, remote)) == NULL)
		   /* exit ENOMEM */
	   if (sdp_error(ss) != 0)
		   /* exit sdp_error(ss) */

	   if (sdp_search(ss, 1, &serv, 1, &attr, 1, &proto) != 0)
		   /* exit sdp_error(ss) */

	   if (proto.flags != SDP_ATTR_OK)
		   /* exit see proto.flags for details */

	   /* If we got here then we have attribute value in proto.value */

DIAGNOSTICS
     Both sdp_open() and sdp_open_local() will return NULL if memory alloca‐
     tion for the new SDP session object fails.	 If the new SDP object was
     created then caller is still expected to call sdp_error() to check if
     there was connection error.

     The sdp_search(), sdp_register_service(), sdp_unregister_service() and
     sdp_change_service() functions return non-zero value on error.  The call‐
     er is expected to call sdp_error() to find out more about error.

SEE ALSO
     bluetooth(3), strerror(3), sdpcontrol(8), sdpd(8)

AUTHORS
     Maksim Yevmenkin ⟨m_evmenkin@yahoo.com⟩

BUGS
     Most likely.  Please report bugs if found.

BSD				 May 27, 2005				   BSD
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