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home | helpSDP(3) FreeBSD Library Functions Manual SDP(3) NAME 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 LIBRARY Bluetooth Service Discovery Protocol User Library (libsdp, -lsdp) 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_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_open_local(void); int32_t sdp_close(void *xs); int32_t sdp_error(void *xs); int32_t 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); 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_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() function 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 Service 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 parameter 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 element, 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 duplication 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. 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; 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_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 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 */ DIAGNOSTICS Both sdp_open() and sdp_open_local() will return NULL if memory allocation 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. SEE ALSO bluetooth(3), strerror(3) BUGS This is client only library for now. Please report bugs if found. AUTHORS Maksim Yevmenkin <m_evmenkin@yahoo.com> FreeBSD 11.0-PRERELEASE September 7, 2003 FreeBSD 11.0-PRERELEASE
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | EXAMPLES | DIAGNOSTICS | SEE ALSO | BUGS | AUTHORS
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