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SDP(3)		       FreeBSD Library Functions Manual			SDP(3)

     SDP_GET8, SDP_GET16, SDP_GET32, SDP_GET64,	SDP_GET128 -- get SDP integer

     SDP_PUT8, SDP_PUT16, SDP_PUT32, SDP_PUT64,	SDP_PUT128 -- put SPD integer

     sdp_open, sdp_open_local, sdp_close sdp_error -- control SDP session

     sdp_search	-- perform SDP query

     sdp_attr2desc, sdp_uuid2desc -- convert numeric SDP attribute/UUID	value
     into human	readable description

     Bluetooth Service Discovery Protocol User Library (libsdp,	-lsdp)

     #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_PUT8(b, cp);

     SDP_PUT16(s, cp);

     SDP_PUT32(l, cp);

     SDP_PUT64(l, cp);

     SDP_PUT128(l, cp);

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

     void *

     sdp_close(void *xs);

     sdp_error(void *xs);

     sdp_search(void *xs, u_int32_t plen, u_int16_t const *pp, u_int32_t alen,
	 u_int32_t const *ap, u_int32_t	vlen, sdp_attr_t *vp);

     char const	* const
     sdp_attr2desc(u_int16_t attr);

     char const	* const
     sdp_uuid2desc(u_int16_t uuid);

     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

     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

     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 can	not be NG_HCI_BDADDR_ANY.  The sdp_open_local()	func-
     tion takes	no arguments and opens a connection to a local SDP server.

     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 a
     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 {
		   u_int16_t	    flags;
	   #define SDP_ATTR_OK		   (0 << 0)
	   #define SDP_ATTR_INVALID	   (1 << 0)
	   #define SDP_ATTR_TRUNCATED	   (1 << 1)
		   u_int16_t	    attr;  /* SDP_ATTR_xxx */
		   u_int32_t	    vlen;  /* length of	the value[] in bytes */
		   u_int8_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 following example shows how to	get SDP_ATTR_PROTOCOL_DESCRIPTOR_LIST
     attribute for the SDP_SERVICE_CLASS_SERIAL_PORT service from the remote

	   bdaddr_t	  remote;
	   u_int8_t	  buffer[1024];
	   void		 *ss	= NULL;
	   u_int16_t	  serv	= SDP_SERVICE_CLASS_SERIAL_PORT;
	   u_int32_t	  attr	= SDP_ATTR_RANGE(
	   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 spd_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 */

     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() function returns non-zero	value on error.	 The caller is
     expected to call sdp_error() to find out more about error.

     bluetooth(3), strerror(3)

     This is client only library for now.  Please report bugs if found.

     Maksim Yevmenkin <>

FreeBSD	11.1		       September 7, 2003		  FreeBSD 11.1


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