1 | /*
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2 | * Copyright (C) 2009-2013 by Matthias Ringwald
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3 | *
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4 | * Redistribution and use in source and binary forms, with or without
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5 | * modification, are permitted provided that the following conditions
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6 | * are met:
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7 | *
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the copyright holders nor the names of
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14 | * contributors may be used to endorse or promote products derived
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15 | * from this software without specific prior written permission.
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16 | * 4. Any redistribution, use, or modification is done solely for
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17 | * personal benefit and not for any commercial purpose or for
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18 | * monetary gain.
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19 | *
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20 | * THIS SOFTWARE IS PROVIDED BY MATTHIAS RINGWALD AND CONTRIBUTORS
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21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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23 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
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24 | * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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25 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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26 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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27 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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28 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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29 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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30 | * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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31 | * SUCH DAMAGE.
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32 | *
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33 | * Please inquire about commercial licensing options at btstack@ringwald.ch
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34 | *
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35 | */
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36 |
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37 | /*
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38 | * sdp_rfcomm_query.c
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39 | */
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40 |
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41 | #include <stdint.h>
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42 | #include <stdio.h>
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43 | #include <stdlib.h>
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44 | #include <string.h>
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45 |
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46 | #include <btstack/hci_cmds.h>
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47 | #include <btstack/sdp_util.h>
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48 |
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49 | #include "sdp_client.h"
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50 | #include "sdp_query_rfcomm.h"
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51 |
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52 | static void dummy_notify_app(sdp_query_event_t* event, void * context);
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53 |
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54 | typedef enum {
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55 | GET_PROTOCOL_LIST_LENGTH = 1,
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56 | GET_PROTOCOL_LENGTH,
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57 | GET_PROTOCOL_ID_HEADER_LENGTH,
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58 | GET_PROTOCOL_ID,
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59 | GET_PROTOCOL_VALUE_LENGTH,
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60 | GET_PROTOCOL_VALUE
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61 | } pdl_state_t;
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62 |
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63 |
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64 | // higher layer query - get rfcomm channel and name
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65 |
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66 | const uint8_t des_attributeIDList[] = { 0x35, 0x05, 0x0A, 0x00, 0x01, 0x01, 0x00}; // Arribute: 0x0001 - 0x0100
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67 |
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68 | static uint8_t des_serviceSearchPattern[5] = {0x35, 0x03, 0x19, 0x00, 0x00};
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69 |
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70 | static uint8_t sdp_service_name[SDP_SERVICE_NAME_LEN+1];
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71 | static uint8_t sdp_rfcom_channel_nr = 0;
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72 | static uint8_t sdp_service_name_header_size;
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73 |
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74 | static pdl_state_t pdl_state = GET_PROTOCOL_LIST_LENGTH;
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75 | static int protocol_value_bytes_received = 0;
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76 | static uint16_t protocol_id = 0;
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77 | static int protocol_offset;
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78 | static int protocol_size;
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79 | static int protocol_id_bytes_to_read;
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80 | static int protocol_value_size;
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81 | static de_state_t de_header_state;
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82 | static de_state_t sn_de_header_state;
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83 |
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84 | static void *sdp_app_context;
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85 | static void (*sdp_app_callback)(sdp_query_event_t * event, void * context) = dummy_notify_app;
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86 |
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87 | //
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88 |
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89 | static void dummy_notify_app(sdp_query_event_t* event, void * context){}
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90 |
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91 | void sdp_query_rfcomm_register_callback(void (*sdp_callback)(sdp_query_event_t* event, void * context), void * context){
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92 | sdp_app_callback = dummy_notify_app;
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93 | if (sdp_callback != NULL){
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94 | sdp_app_callback = sdp_callback;
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95 | }
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96 | sdp_app_context = context;
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97 | }
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98 |
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99 | void handleProtocolDescriptorListData(uint32_t attribute_value_length, uint32_t data_offset, uint8_t data){
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100 | // init state on first byte
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101 | if (data_offset == 0){
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102 | pdl_state = GET_PROTOCOL_LIST_LENGTH;
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103 | }
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104 |
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105 | // log_info("handleProtocolDescriptorListData (%u,%u) %02x", attribute_value_length, data_offset, data);
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106 |
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107 | switch(pdl_state){
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108 |
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109 | case GET_PROTOCOL_LIST_LENGTH:
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110 | if (!de_state_size(data, &de_header_state)) break;
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111 | // log_info(" query: PD List payload is %d bytes.", de_header_state.de_size);
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112 | // log_info(" query: PD List offset %u, list size %u", de_header_state.de_offset, de_header_state.de_size);
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113 |
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114 | pdl_state = GET_PROTOCOL_LENGTH;
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115 | break;
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116 |
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117 | case GET_PROTOCOL_LENGTH:
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118 | // check size
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119 | if (!de_state_size(data, &de_header_state)) break;
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120 | // log_info(" query: PD Record payload is %d bytes.", de_header_state.de_size);
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121 |
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122 | // cache protocol info
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123 | protocol_offset = de_header_state.de_offset;
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124 | protocol_size = de_header_state.de_size;
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125 |
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126 | pdl_state = GET_PROTOCOL_ID_HEADER_LENGTH;
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127 | break;
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128 |
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129 | case GET_PROTOCOL_ID_HEADER_LENGTH:
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130 | protocol_offset++;
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131 | if (!de_state_size(data, &de_header_state)) break;
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132 |
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133 | protocol_id = 0;
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134 | protocol_id_bytes_to_read = de_header_state.de_size;
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135 | // log_info(" query: ID data is stored in %d bytes.", protocol_id_bytes_to_read);
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136 | pdl_state = GET_PROTOCOL_ID;
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137 |
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138 | break;
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139 |
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140 | case GET_PROTOCOL_ID:
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141 | protocol_offset++;
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142 |
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143 | protocol_id = (protocol_id << 8) | data;
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144 | protocol_id_bytes_to_read--;
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145 | if (protocol_id_bytes_to_read > 0) break;
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146 |
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147 | // log_info(" query: Protocol ID: %04x.", protocol_id);
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148 |
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149 | if (protocol_offset >= protocol_size){
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150 | pdl_state = GET_PROTOCOL_LENGTH;
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151 | // log_info(" query: Get next protocol");
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152 | break;
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153 | }
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154 |
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155 | pdl_state = GET_PROTOCOL_VALUE_LENGTH;
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156 | protocol_value_bytes_received = 0;
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157 | break;
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158 |
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159 | case GET_PROTOCOL_VALUE_LENGTH:
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160 | protocol_offset++;
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161 |
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162 | if (!de_state_size(data, &de_header_state)) break;
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163 |
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164 | protocol_value_size = de_header_state.de_size;
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165 | pdl_state = GET_PROTOCOL_VALUE;
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166 | sdp_rfcom_channel_nr = 0;
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167 | break;
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168 |
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169 | case GET_PROTOCOL_VALUE:
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170 | protocol_offset++;
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171 | protocol_value_bytes_received++;
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172 |
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173 | // log_info(" query: protocol_value_bytes_received %u, protocol_value_size %u", protocol_value_bytes_received, protocol_value_size);
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174 |
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175 | if (protocol_value_bytes_received < protocol_value_size) break;
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176 |
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177 | if (protocol_id == 0x0003){
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178 | // log_info("\n\n ******* Data ***** %02x\n\n", data);
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179 | sdp_rfcom_channel_nr = data;
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180 | }
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181 |
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182 | // log_info(" query: protocol done");
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183 | // log_info(" query: Protocol offset %u, protocol size %u", protocol_offset, protocol_size);
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184 |
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185 | if (protocol_offset >= protocol_size) {
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186 | pdl_state = GET_PROTOCOL_LENGTH;
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187 | break;
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188 |
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189 | }
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190 | pdl_state = GET_PROTOCOL_ID_HEADER_LENGTH;
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191 | // log_info(" query: Get next protocol");
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192 | break;
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193 | default:
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194 | break;
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195 | }
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196 | }
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197 |
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198 | void handleServiceNameData(uint32_t attribute_value_length, uint32_t data_offset, uint8_t data){
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199 | int name_len;
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200 | int name_pos;
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201 |
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202 | // Get Header Len
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203 | if (data_offset == 0){
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204 | de_state_size(data, &sn_de_header_state);
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205 | sdp_service_name_header_size = sn_de_header_state.addon_header_bytes + 1;
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206 | return;
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207 | }
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208 |
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209 | // Get Header
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210 | if (data_offset < sdp_service_name_header_size){
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211 | de_state_size(data, &sn_de_header_state);
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212 | return;
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213 | }
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214 |
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215 | // Process payload
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216 | name_len = attribute_value_length - sdp_service_name_header_size;
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217 | name_pos = data_offset - sdp_service_name_header_size;
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218 |
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219 | if (name_pos < SDP_SERVICE_NAME_LEN){
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220 | sdp_service_name[name_pos] = data;
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221 | name_pos++;
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222 |
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223 | // terminate if name complete
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224 | if (name_pos >= name_len){
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225 | sdp_service_name[name_pos] = 0;
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226 | }
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227 |
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228 | // terminate if buffer full
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229 | if (name_pos == SDP_SERVICE_NAME_LEN){
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230 | sdp_service_name[name_pos] = 0;
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231 | }
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232 | }
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233 |
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234 | // notify on last char
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235 | if (data_offset == attribute_value_length - 1 && sdp_rfcom_channel_nr!=0){
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236 | sdp_query_rfcomm_service_event_t value_event = {
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237 | SDP_QUERY_RFCOMM_SERVICE,
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238 | sdp_rfcom_channel_nr,
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239 | (uint8_t *) sdp_service_name
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240 | };
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241 | (*sdp_app_callback)((sdp_query_event_t*)&value_event, sdp_app_context);
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242 | sdp_rfcom_channel_nr = 0;
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243 | }
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244 | }
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245 |
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246 |
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247 | static void handle_sdp_parser_event(sdp_query_event_t * event){
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248 | sdp_query_attribute_value_event_t * ve;
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249 | switch (event->type){
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250 | case SDP_EVENT_QUERY_ATTRIBUTE_VALUE:
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251 | ve = (sdp_query_attribute_value_event_t*) event;
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252 | // log_info("handle_sdp_parser_event [ AID, ALen, DOff, Data] : [%x, %u, %u] BYTE %02x",
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253 | // ve->attribute_id, ve->attribute_length, ve->data_offset, ve->data);
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254 |
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255 | switch (ve->attribute_id){
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256 | case BLUETOOTH_ATTRIBUTE_PROTOCOL_DESCRIPTOR_LIST:
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257 | // find rfcomm channel
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258 | handleProtocolDescriptorListData(ve->attribute_length, ve->data_offset, ve->data);
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259 | break;
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260 | case 0x0100:
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261 | // get service name
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262 | handleServiceNameData(ve->attribute_length, ve->data_offset, ve->data);
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263 | break;
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264 | default:
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265 | // give up
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266 | return;
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267 | }
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268 | break;
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269 | case SDP_EVENT_QUERY_COMPLETE:
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270 | (*sdp_app_callback)(event, sdp_app_context);
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271 | break;
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272 | }
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273 | // insert higher level code HERE
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274 | }
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275 |
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276 | void sdp_query_rfcomm_init(){
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277 | // init
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278 | de_state_init(&de_header_state);
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279 | de_state_init(&sn_de_header_state);
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280 | pdl_state = GET_PROTOCOL_LIST_LENGTH;
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281 | protocol_offset = 0;
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282 | sdp_parser_register_callback(handle_sdp_parser_event);
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283 | }
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284 |
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285 |
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286 | void sdp_query_rfcomm_channel_and_name_for_search_pattern(bd_addr_t remote, uint8_t * serviceSearchPattern){
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287 | sdp_parser_init();
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288 | sdp_query_rfcomm_init();
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289 | sdp_client_query(remote, serviceSearchPattern, (uint8_t*)&des_attributeIDList[0]);
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290 | }
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291 |
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292 | void sdp_query_rfcomm_channel_and_name_for_uuid(bd_addr_t remote, uint16_t uuid){
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293 | net_store_16(des_serviceSearchPattern, 3, uuid);
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294 | sdp_query_rfcomm_channel_and_name_for_search_pattern(remote, (uint8_t*)des_serviceSearchPattern);
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295 | }
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296 |
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297 | void sdp_query_rfcomm_deregister_callback(){
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298 | sdp_query_rfcomm_init();
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299 | sdp_app_callback = dummy_notify_app;
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300 | sdp_app_context = NULL;
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301 | }
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