1 /*
2 * Copyright (C) 2014 BlueKitchen GmbH
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the copyright holders nor the names of
14 * contributors may be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * 4. Any redistribution, use, or modification is done solely for
17 * personal benefit and not for any commercial purpose or for
18 * monetary gain.
19 *
20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BLUEKITCHEN
24 * GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * Please inquire about commercial licensing options at
34 * [email protected]
35 *
36 */
37
38 #define BTSTACK_FILE__ "sdp_bnep_query.c"
39
40 // *****************************************************************************
41 /* EXAMPLE_START(sdp_bnep_query): SDP Client - Query BNEP SDP record
42 *
43 * @text The example shows how the SDP Client is used to get all BNEP service
44 * records from a remote device. It extracts the remote BNEP PAN protocol
45 * UUID and the L2CAP PSM, which are needed to connect to a remote BNEP service.
46 */
47 // *****************************************************************************
48
49 #include "btstack_config.h"
50
51 #include <stdint.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55
56 #include "btstack.h"
57
58 int record_id = -1;
59 int attribute_id = -1;
60
61 static uint8_t attribute_value[1000];
62 static const int attribute_value_buffer_size = sizeof(attribute_value);
63
64 static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3};
65 static btstack_packet_callback_registration_t hci_event_callback_registration;
66
assertBuffer(int size)67 static void assertBuffer(int size){
68 if (size > attribute_value_buffer_size){
69 printf("SDP attribute value buffer size exceeded: available %d, required %d", attribute_value_buffer_size, size);
70 }
71 }
72
73 /* @section SDP Client Setup
74 *
75 * @text As with the previous example, you must register a
76 * callback, i.e. query handler, with the SPD parser, as shown in
77 * Listing SDPClientInit. Via this handler, the SDP client will receive events:
78 * - SDP_EVENT_QUERY_ATTRIBUTE_VALUE containing the results of the query in chunks,
79 * - SDP_EVENT_QUERY_COMPLETE reporting the status and the end of the query.
80 */
81
82 /* LISTING_START(SDPClientInit): SDP client setup */
83 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
84 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
85
sdp_bnep_qeury_init(void)86 static void sdp_bnep_qeury_init(void){
87 // init L2CAP
88 l2cap_init();
89
90 // register for HCI events
91 hci_event_callback_registration.callback = &packet_handler;
92 hci_add_event_handler(&hci_event_callback_registration);
93 }
94 /* LISTING_END */
95
96
97 /* @section SDP Client Query
98 * To trigger an SDP query to get the a list of service records on a remote device,
99 * you need to call sdp_client_query_uuid16() with the remote address and the
100 * BNEP protocol UUID, as shown in Listing SDPQueryUUID.
101 * In this example we again used fixed address of the remote device. Please update
102 * for your environment.
103 */
104
105 /* LISTING_START(SDPQueryUUID): Querying the a list of service records on a remote device. */
packet_handler(uint8_t packet_type,uint16_t channel,uint8_t * packet,uint16_t size)106 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
107 UNUSED(channel);
108 UNUSED(size);
109
110 if (packet_type != HCI_EVENT_PACKET) return;
111 uint8_t event = hci_event_packet_get_type(packet);
112
113 switch (event) {
114 case BTSTACK_EVENT_STATE:
115 // BTstack activated, get started
116 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){
117 printf("Start SDP BNEP query.\n");
118 sdp_client_query_uuid16(&handle_sdp_client_query_result, remote, BLUETOOTH_PROTOCOL_BNEP);
119 }
120 break;
121 default:
122 break;
123 }
124 }
125 /* LISTING_END */
126
get_string_from_data_element(uint8_t * element,uint16_t buffer_size,char * buffer_data)127 static void get_string_from_data_element(uint8_t * element, uint16_t buffer_size, char * buffer_data){
128 de_size_t de_size = de_get_size_type(element);
129 int pos = de_get_header_size(element);
130 int len = 0;
131 switch (de_size){
132 case DE_SIZE_VAR_8:
133 len = element[1];
134 break;
135 case DE_SIZE_VAR_16:
136 len = big_endian_read_16(element, 1);
137 break;
138 default:
139 break;
140 }
141 uint16_t bytes_to_copy = btstack_min(buffer_size-1,len);
142 memcpy(buffer_data, &element[pos], bytes_to_copy);
143 buffer_data[bytes_to_copy] ='\0';
144 }
145
146
147 /* @section Handling SDP Client Query Result
148 *
149 * @text The SDP Client returns the result of the query in chunks. Each result
150 * packet contains the record ID, the Attribute ID, and a chunk of the Attribute
151 * value, see Listing HandleSDPQUeryResult. Here, we show how to parse the
152 * Service Class ID List and Protocol Descriptor List, as they contain
153 * the BNEP Protocol UUID and L2CAP PSM respectively.
154 */
155
156 /* LISTING_START(HandleSDPQUeryResult): Extracting BNEP Protcol UUID and L2CAP PSM */
handle_sdp_client_query_result(uint8_t packet_type,uint16_t channel,uint8_t * packet,uint16_t size)157 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
158 UNUSED(packet_type);
159 UNUSED(channel);
160 UNUSED(size);
161
162 /* LISTING_PAUSE */
163 des_iterator_t des_list_it;
164 des_iterator_t prot_it;
165 char str[20];
166
167 switch (hci_event_packet_get_type(packet)){
168 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE:
169 // handle new record
170 if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id){
171 record_id = sdp_event_query_attribute_byte_get_record_id(packet);
172 printf("\n---\nRecord nr. %u\n", record_id);
173 }
174
175 assertBuffer(sdp_event_query_attribute_byte_get_attribute_length(packet));
176
177 attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet);
178 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)){
179
180 /* LISTING_RESUME */
181 /* @text The Service Class ID List is a Data Element Sequence (DES) of UUIDs.
182 * The BNEP PAN protocol UUID is within this list.
183 */
184
185 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)){
186 // 0x0001 "Service Class ID List"
187 case BLUETOOTH_ATTRIBUTE_SERVICE_CLASS_ID_LIST:
188 if (de_get_element_type(attribute_value) != DE_DES) break;
189 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)){
190 uint8_t * element = des_iterator_get_element(&des_list_it);
191 if (de_get_element_type(element) != DE_UUID) continue;
192 uint32_t uuid = de_get_uuid32(element);
193 switch (uuid){
194 case BLUETOOTH_SERVICE_CLASS_PANU:
195 case BLUETOOTH_SERVICE_CLASS_NAP:
196 case BLUETOOTH_SERVICE_CLASS_GN:
197 printf(" ** Attribute 0x%04x: BNEP PAN protocol UUID: %04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet), (int) uuid);
198 break;
199 default:
200 break;
201 }
202 }
203 break;
204 /* LISTING_PAUSE */
205 // 0x0100 "Service Name"
206 case 0x0100:
207 // 0x0101 "Service Description"
208 case 0x0101:
209 get_string_from_data_element(attribute_value, sizeof(str), str);
210 printf(" ** Attribute 0x%04x: %s\n", sdp_event_query_attribute_byte_get_attribute_id(packet), str);
211 break;
212
213 /* LISTING_RESUME */
214 /* @text The Protocol Descriptor List is DES
215 * which contains one DES for each protocol. For PAN serivces, it contains
216 * a DES with the L2CAP Protocol UUID and a PSM,
217 * and another DES with the BNEP UUID and the the BNEP version.
218 */
219 case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST:{
220 printf(" ** Attribute 0x%04x: ", sdp_event_query_attribute_byte_get_attribute_id(packet));
221
222 uint16_t l2cap_psm = 0;
223 uint16_t bnep_version = 0;
224 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)){
225 if (des_iterator_get_type(&des_list_it) != DE_DES) continue;
226 uint8_t * des_element = des_iterator_get_element(&des_list_it);
227 des_iterator_init(&prot_it, des_element);
228 uint8_t * element = des_iterator_get_element(&prot_it);
229
230 if (de_get_element_type(element) != DE_UUID) continue;
231 uint32_t uuid = de_get_uuid32(element);
232 des_iterator_next(&prot_it);
233 switch (uuid){
234 case BLUETOOTH_PROTOCOL_L2CAP:
235 if (!des_iterator_has_more(&prot_it)) continue;
236 de_element_get_uint16(des_iterator_get_element(&prot_it), &l2cap_psm);
237 break;
238 case BLUETOOTH_PROTOCOL_BNEP:
239 if (!des_iterator_has_more(&prot_it)) continue;
240 de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_version);
241 break;
242 default:
243 break;
244 }
245 }
246 printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", l2cap_psm, bnep_version);
247 }
248 break;
249 /* LISTING_PAUSE */
250 default:
251 break;
252 }
253 }
254 break;
255 case SDP_EVENT_QUERY_COMPLETE:
256 if (sdp_event_query_complete_get_status(packet)){
257 printf("SDP query failed, status 0x%02x\n", sdp_event_query_complete_get_status(packet));
258 break;
259 }
260 printf("SDP query done.\n");
261 break;
262 default:
263 break;
264 }
265 /* LISTING_RESUME */
266 }
267 /* LISTING_END */
268
269 int btstack_main(int argc, const char * argv[]);
btstack_main(int argc,const char * argv[])270 int btstack_main(int argc, const char * argv[]){
271 (void)argc;
272 (void)argv;
273
274 printf("Client HCI init done\r\n");
275
276 sdp_bnep_qeury_init();
277
278 // turn on!
279 hci_power_control(HCI_POWER_ON);
280
281 return 0;
282 }
283
284 /* EXAMPLE_END */
285