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 MATTHIAS 24 * RINGWALD 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): Dump remote BNEP PAN protocol UUID and L2CAP PSM 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_event.h" 57 #include "btstack_memory.h" 58 #include "btstack_run_loop.h" 59 #include "classic/sdp_client.h" 60 #include "classic/sdp_util.h" 61 #include "hci.h" 62 #include "hci_cmd.h" 63 #include "hci_dump.h" 64 #include "l2cap.h" 65 #include "pan.h" 66 67 int record_id = -1; 68 int attribute_id = -1; 69 70 static uint8_t attribute_value[1000]; 71 static const int attribute_value_buffer_size = sizeof(attribute_value); 72 73 static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3}; 74 static btstack_packet_callback_registration_t hci_event_callback_registration; 75 76 static void assertBuffer(int size){ 77 if (size > attribute_value_buffer_size){ 78 printf("SDP attribute value buffer size exceeded: available %d, required %d", attribute_value_buffer_size, size); 79 } 80 } 81 82 /* @section SDP Client Setup 83 * 84 * @text As with the previous example, you must register a 85 * callback, i.e. query handler, with the SPD parser, as shown in 86 * Listing SDPClientInit. Via this handler, the SDP client will receive events: 87 * - SDP_EVENT_QUERY_ATTRIBUTE_VALUE containing the results of the query in chunks, 88 * - SDP_EVENT_QUERY_COMPLETE reporting the status and the end of the query. 89 */ 90 91 /* LISTING_START(SDPClientInit): SDP client setup */ 92 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 93 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 94 95 static void sdp_client_init(void){ 96 97 // register for HCI events 98 hci_event_callback_registration.callback = &packet_handler; 99 hci_add_event_handler(&hci_event_callback_registration); 100 101 // init L2CAP 102 l2cap_init(); 103 } 104 /* LISTING_END */ 105 106 107 /* @section SDP Client Query 108 * To trigger an SDP query to get the a list of service records on a remote device, 109 * you need to call sdp_client_query_uuid16() with the remote address and the 110 * BNEP protocol UUID, as shown in Listing SDPQueryUUID. 111 * In this example we again used fixed address of the remote device. Please update 112 * for your environment. 113 */ 114 115 /* LISTING_START(SDPQueryUUID): Querying the a list of service records on a remote device. */ 116 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 117 UNUSED(channel); 118 UNUSED(size); 119 120 if (packet_type != HCI_EVENT_PACKET) return; 121 uint8_t event = hci_event_packet_get_type(packet); 122 123 switch (event) { 124 case BTSTACK_EVENT_STATE: 125 // BTstack activated, get started 126 if (btstack_event_state_get_state(packet) == HCI_STATE_WORKING){ 127 printf("Start SDP BNEP query.\n"); 128 sdp_client_query_uuid16(&handle_sdp_client_query_result, remote, SDP_BNEPProtocol); 129 } 130 break; 131 default: 132 break; 133 } 134 } 135 /* LISTING_END */ 136 137 static char * get_string_from_data_element(uint8_t * element){ 138 de_size_t de_size = de_get_size_type(element); 139 int pos = de_get_header_size(element); 140 int len = 0; 141 switch (de_size){ 142 case DE_SIZE_VAR_8: 143 len = element[1]; 144 break; 145 case DE_SIZE_VAR_16: 146 len = big_endian_read_16(element, 1); 147 break; 148 default: 149 break; 150 } 151 char * str = (char*)malloc(len+1); 152 memcpy(str, &element[pos], len); 153 str[len] ='\0'; 154 return str; 155 } 156 157 158 /* @section Handling SDP Client Query Result 159 * 160 * @text The SDP Client returns the result of the query in chunks. Each result 161 * packet contains the record ID, the Attribute ID, and a chunk of the Attribute 162 * value, see Listing HandleSDPQUeryResult. Here, we show how to parse the 163 * Service Class ID List and Protocol Descriptor List, as they contain 164 * the BNEP Protocol UUID and L2CAP PSM respectively. 165 */ 166 167 /* LISTING_START(HandleSDPQUeryResult): Extracting BNEP Protcol UUID and L2CAP PSM */ 168 static void handle_sdp_client_query_result(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 169 UNUSED(packet_type); 170 UNUSED(channel); 171 UNUSED(size); 172 173 /* LISTING_PAUSE */ 174 des_iterator_t des_list_it; 175 des_iterator_t prot_it; 176 char *str; 177 178 switch (hci_event_packet_get_type(packet)){ 179 case SDP_EVENT_QUERY_ATTRIBUTE_VALUE: 180 // handle new record 181 if (sdp_event_query_attribute_byte_get_record_id(packet) != record_id){ 182 record_id = sdp_event_query_attribute_byte_get_record_id(packet); 183 printf("\n---\nRecord nr. %u\n", record_id); 184 } 185 186 assertBuffer(sdp_event_query_attribute_byte_get_attribute_length(packet)); 187 188 attribute_value[sdp_event_query_attribute_byte_get_data_offset(packet)] = sdp_event_query_attribute_byte_get_data(packet); 189 if ((uint16_t)(sdp_event_query_attribute_byte_get_data_offset(packet)+1) == sdp_event_query_attribute_byte_get_attribute_length(packet)){ 190 191 /* LISTING_RESUME */ 192 /* @text The Service Class ID List is a Data Element Sequence (DES) of UUIDs. 193 * The BNEP PAN protocol UUID is within this list. 194 */ 195 196 switch(sdp_event_query_attribute_byte_get_attribute_id(packet)){ 197 // 0x0001 "Service Class ID List" 198 case SDP_ServiceClassIDList: 199 if (de_get_element_type(attribute_value) != DE_DES) break; 200 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)){ 201 uint8_t * element = des_iterator_get_element(&des_list_it); 202 if (de_get_element_type(element) != DE_UUID) continue; 203 uint32_t uuid = de_get_uuid32(element); 204 switch (uuid){ 205 case PANU_UUID: 206 case NAP_UUID: 207 case GN_UUID: 208 printf(" ** Attribute 0x%04x: BNEP PAN protocol UUID: %04x\n", sdp_event_query_attribute_byte_get_attribute_id(packet), uuid); 209 break; 210 default: 211 break; 212 } 213 } 214 break; 215 /* LISTING_PAUSE */ 216 // 0x0100 "Service Name" 217 case 0x0100: 218 // 0x0101 "Service Description" 219 case 0x0101: 220 str = get_string_from_data_element(attribute_value); 221 printf(" ** Attribute 0x%04x: %s\n", sdp_event_query_attribute_byte_get_attribute_id(packet), str); 222 free(str); 223 break; 224 225 /* LISTING_RESUME */ 226 /* @text The Protocol Descriptor List is DES 227 * which contains one DES for each protocol. For PAN serivces, it contains 228 * a DES with the L2CAP Protocol UUID and a PSM, 229 * and another DES with the BNEP UUID and the the BNEP version. 230 */ 231 case SDP_ProtocolDescriptorList:{ 232 printf(" ** Attribute 0x%04x: ", sdp_event_query_attribute_byte_get_attribute_id(packet)); 233 234 uint16_t l2cap_psm = 0; 235 uint16_t bnep_version = 0; 236 for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)){ 237 if (des_iterator_get_type(&des_list_it) != DE_DES) continue; 238 uint8_t * des_element = des_iterator_get_element(&des_list_it); 239 des_iterator_init(&prot_it, des_element); 240 uint8_t * element = des_iterator_get_element(&prot_it); 241 242 if (de_get_element_type(element) != DE_UUID) continue; 243 uint32_t uuid = de_get_uuid32(element); 244 switch (uuid){ 245 case SDP_L2CAPProtocol: 246 if (!des_iterator_has_more(&prot_it)) continue; 247 des_iterator_next(&prot_it); 248 de_element_get_uint16(des_iterator_get_element(&prot_it), &l2cap_psm); 249 break; 250 case SDP_BNEPProtocol: 251 if (!des_iterator_has_more(&prot_it)) continue; 252 des_iterator_next(&prot_it); 253 de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_version); 254 break; 255 default: 256 break; 257 } 258 } 259 printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", l2cap_psm, bnep_version); 260 } 261 break; 262 /* LISTING_PAUSE */ 263 default: 264 break; 265 } 266 } 267 break; 268 case SDP_EVENT_QUERY_COMPLETE: 269 printf("General query done with status %d.\n\n", sdp_event_query_complete_get_status(packet)); 270 break; 271 } 272 /* LISTING_RESUME */ 273 } 274 /* LISTING_END */ 275 276 int btstack_main(int argc, const char * argv[]); 277 int btstack_main(int argc, const char * argv[]){ 278 (void)argc; 279 (void)argv; 280 281 printf("Client HCI init done\r\n"); 282 283 sdp_client_init(); 284 285 // turn on! 286 hci_power_control(HCI_POWER_ON); 287 288 return 0; 289 } 290 291 /* EXAMPLE_END */