sdp_lib.h

蓝牙的各种编程接口和各种按理介绍,还有一些例子和说明

/*
   Service Discovery Protocol (SDP)
   Copyright (C) 2002 Maxim Krasnyansky <[e-mail]>, Stephen Crane <[e-mail]>
   
   Based on original SDP implementation by Nokia Corporation.
   Copyright (C) 2001,2002 Nokia Corporation.
   Original author Guruprasad Krishnamurthy <[e-mail]>
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;
   
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY CLAIM,
   OR 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.
   
   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, COPYRIGHTS,
   TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS SOFTWARE IS DISCLAIMED.
 */

/*
   SDP Library 
	SDP initialization
	General inquiry (GIAC) and SDP connections
	SDP requests
	SDP record registration
 
   Fixes:
	Guruprasad Krishnamurthy <[e-mail]>
 */

/*
 * $Id: sdp_lib.h,v 1.63 2003/06/17 13:12:36 jscrane Exp $
 */
#ifndef SDP_LIB_H
#define SDP_LIB_H

#include <sys/socket.h>
#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>

#ifdef __cplusplus
extern "C" {
#endif

/*
 * SDP lists
 */
typedef void(*sdp_list_func_t)(void *, void *);
typedef void(*sdp_free_func_t)(void *);
typedef int (*sdp_comp_func_t)(const void *, const void *);

sdp_list_t *sdp_list_append(sdp_list_t *list, void *d);
sdp_list_t *sdp_list_remove(sdp_list_t *list, void *d);
sdp_list_t *sdp_list_insert_sorted(sdp_list_t *list, void *data, sdp_comp_func_t f);
void        sdp_list_free(sdp_list_t *list, sdp_free_func_t f);

static inline int sdp_list_len(const sdp_list_t *list) 
{
	int n = 0;
	for (; list; list = list->next)
		n++;
	return n;
}

static inline sdp_list_t *sdp_list_find(sdp_list_t *list, void *u, sdp_comp_func_t f)
{
	for (; list; list = list->next)
		if (f(list->data, u) == 0)
			return list;
	return NULL;
}

static inline void sdp_list_foreach(sdp_list_t *list, sdp_list_func_t f, void *u)
{
	for (; list; list = list->next)
		f(list->data, u);
}

/*
 * create an L2CAP connection to a Bluetooth device
 * 
 * INPUT:
 *  
 *  bdaddr_t *src:
 *	Address of the local device to use to make the connection
 *	(or BDADDR_ANY)
 *
 *  bdaddr_t *dst:
 *    Address of the SDP server device
 */
sdp_session_t *sdp_connect(const bdaddr_t *src, const bdaddr_t *dst, uint32_t flags);
int sdp_close(sdp_session_t *session);

static inline int sdp_get_socket(const sdp_session_t *s)
{
	return s->sock;
}

/*
 * find all devices in the piconet
 */
int sdp_general_inquiry(inquiry_info *ii, int dev_num, int duration, uint8_t *found);

/* flexible extraction of basic attributes - Jean II */
int sdp_get_int_attr(const sdp_record_t *rec, uint16_t attr, int *value);
int sdp_get_string_attr(const sdp_record_t *rec, uint16_t attr, char *value, int valuelen);

/*
 * Basic sdp data functions
 */
sdp_data_t *sdp_data_alloc(uint8_t dtd, const void *value);
void sdp_data_free(sdp_data_t *data);
sdp_data_t *sdp_data_get(const sdp_record_t *rec, uint16_t attr_id);

sdp_data_t *sdp_seq_alloc(void **dtds, void **values, int len);
sdp_data_t *sdp_seq_append(sdp_data_t *seq, sdp_data_t *data);

int sdp_attr_add(sdp_record_t *rec, uint16_t attr, sdp_data_t *data);
void sdp_attr_remove(sdp_record_t *rec, uint16_t attr);
void sdp_attr_replace(sdp_record_t *rec, uint16_t attr, sdp_data_t *data);
int sdp_set_uuidseq_attr(sdp_record_t *rec, uint16_t attr, sdp_list_t *seq);
int sdp_get_uuidseq_attr(const sdp_record_t *rec, uint16_t attr, sdp_list_t **seqp);

/*
 * NOTE that none of the functions below will update the SDP server, 
 * unless the {register, update}sdp_record_t() function is invoked.
 * All functions which return an integer value, return 0 on success 
 * or -1 on failure.
 */

/*
 * Create an attribute and add it to the service record's attribute list.
 * This consists of the data type descriptor of the attribute, 
 * the value of the attribute and the attribute identifier.
 */
int sdp_attr_add_new(sdp_record_t *rec, uint16_t attr, uint8_t dtd, const void *p);

/*
 * Set the information attributes of the service record.
 * The set of attributes comprises service name, description 
 * and provider name
 */
void sdp_set_info_attr(sdp_record_t *rec, const char *name, const char *prov, const char *desc);

/*
 * Set the ServiceClassID attribute to the sequence specified by seq.
 * Note that the identifiers need to be in sorted order from the most 
 * specific to the most generic service class that this service
 * conforms to.
 */
static inline int sdp_set_service_classes(sdp_record_t *rec, sdp_list_t *seq)
{
	return sdp_set_uuidseq_attr(rec, SDP_ATTR_SVCLASS_ID_LIST, seq);
}

/*
 * Get the service classes to which the service conforms.
 * 
 * When set, the list contains elements of ServiceClassIdentifer(uint16_t) 
 * ordered from most specific to most generic
 */
static inline int sdp_get_service_classes(const sdp_record_t *rec, sdp_list_t **seqp)
{
	return sdp_get_uuidseq_attr(rec, SDP_ATTR_SVCLASS_ID_LIST, seqp);
}

/*
 * Set the BrowseGroupList attribute to the list specified by seq.
 * 
 * A service can belong to one or more service groups 
 * and the list comprises such group identifiers (UUIDs)
 */
static inline int sdp_set_browse_groups(sdp_record_t *rec, sdp_list_t *seq)
{
	return sdp_set_uuidseq_attr(rec, SDP_ATTR_BROWSE_GRP_LIST, seq);
}

/*
 * Set the access protocols of the record to those specified in proto
 */
int sdp_set_access_protos(sdp_record_t *rec, const sdp_list_t *proto);

/*
 * Get protocol port (i.e. PSM for L2CAP, Channel for RFCOMM) 
 */
int sdp_get_proto_port(const sdp_list_t *list, int proto);

/*
 * Get protocol descriptor. 
 */
sdp_data_t *sdp_get_proto_desc(sdp_list_t *list, int proto);

/*
 * Set the LanguageBase attributes to the values specified in list 
 * (a linked list of sdp_lang_attr_t objects, one for each language in 
 * which user-visible attributes are present).
 */
int sdp_set_lang_attr(sdp_record_t *rec, const sdp_list_t *list);

/*
 * Set the ServiceInfoTimeToLive attribute of the service.  
 * This is the number of seconds that this record is guaranteed
 * not to change after being obtained by a client.
 */
static inline int sdp_set_service_ttl(sdp_record_t *rec, uint32_t ttl)
{
	return sdp_attr_add_new(rec, SDP_ATTR_SVCINFO_TTL, SDP_UINT32, &ttl);
}

/*
 * Set the ServiceRecordState attribute of a service. This is
 * guaranteed to change if there is any kind of modification to 
 * the record. 
 */
static inline int sdp_set_record_state(sdp_record_t *rec, uint32_t state)
{
	return sdp_attr_add_new(rec, SDP_ATTR_RECORD_STATE, SDP_UINT32, &state);
}

/*
 * Set the ServiceID attribute of a service. 
 */
void sdp_set_service_id(sdp_record_t *rec, uuid_t uuid);

/*
 * Set the GroupID attribute of a service
 */
void sdp_set_group_id(sdp_record_t *rec, uuid_t grouuuid);

/*
 * Set the ServiceAvailability attribute of a service.
 * 
 * Note that this represents the relative availability
 * of the service: 0x00 means completely unavailable;
 * 0xFF means maximum availability.
 */
static inline int sdp_set_service_avail(sdp_record_t *rec, uint8_t avail)
{
	return sdp_attr_add_new(rec, SDP_ATTR_SERVICE_AVAILABILITY, SDP_UINT8, &avail);
}

/*
 * Set the profile descriptor list attribute of a record.
 * 
 * Each element in the list is an object of type
 * sdp_profile_desc_t which is a definition of the
 * Bluetooth profile that this service conforms to.
 */
int sdp_set_profile_descs(sdp_record_t *rec, const sdp_list_t *desc);

/*
 * Set URL attributes of a record.
 * 
 * ClientExecutableURL: a URL to a client's platform specific (WinCE, 
 * PalmOS) executable code that can be used to access this service.
 * 
 * DocumentationURL: a URL pointing to service documentation
 * 
 * IconURL: a URL to an icon that can be used to represent this service.
 * 
 * Note: pass NULL for any URLs that you don't want to set or remove
 */
void sdp_set_url_attr(sdp_record_t *rec, const char *clientExecURL, const char *docURL, const char *iconURL);