1 | #include "rfcomm.hpp"
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2 |
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3 | #include "../asio/asio_io_service.h"
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4 | #include "../asio/rfcomm.hpp"
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5 | #include "../asio/bluetooth_endpoint.hpp"
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6 |
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7 | #include <boost/asio.hpp>
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8 | #include <boost/thread.hpp>
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9 | #include <boost/array.hpp>
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10 | #include <memory.h>
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11 | #include <deque>
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12 | #include <cerrno>
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13 |
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14 | namespace ariba {
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15 | namespace transport {
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16 |
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17 | use_logging_cpp(rfcomm)
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18 |
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19 | using namespace boost::asio;
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20 | using namespace detail;
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21 | using namespace std;
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22 |
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23 | using boost::system::error_code;
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24 |
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25 | class link_data {
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26 | public:
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27 | uint8_t size_[4];
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28 | size_t size;
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29 | uint8_t* buffer;
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30 | };
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31 |
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32 | class link_info {
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33 | public:
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34 | link_info(io_service& io ) :
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35 | up(false), local(), remote(), socket(io), connect_retries(0),
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36 | size(0), buffer(NULL), sending(false) {
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37 | }
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38 |
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39 | // state
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40 | bool up;
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41 | rfcomm_endpoint local, remote;
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42 | bluetooth::rfcomm::socket socket;
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43 | int connect_retries;
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44 |
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45 | // read buffer
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46 | uint8_t size_[4];
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47 | size_t size;
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48 | uint8_t* buffer;
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49 |
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50 | // send buffer
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51 | bool sending;
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52 | boost::mutex mutex;
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53 | std::deque<link_data> send_buffer;
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54 | };
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55 |
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56 | void rfcomm::shutdown(link_info* info) {
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57 | if (info != NULL && info->up) {
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58 | info->up = false;
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59 | info->socket.shutdown( bluetooth::rfcomm::socket::shutdown_both );
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60 | }
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61 | }
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62 |
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63 |
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64 | inline bluetooth::rfcomm::endpoint convert( const rfcomm_endpoint& endpoint ) {
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65 | return bluetooth::rfcomm::endpoint(
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66 | endpoint.mac().bluetooth(), endpoint.channel().value()
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67 | );
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68 | }
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69 |
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70 | inline rfcomm_endpoint convert( const bluetooth::rfcomm::endpoint& endpoint ) {
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71 | mac_address mac;
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72 | mac.bluetooth( endpoint.address() );
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73 | rfcomm_channel_address channel;
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74 | channel.value( endpoint.channel() );
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75 | return rfcomm_endpoint( mac, channel );
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76 | }
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77 |
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78 |
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79 | rfcomm::rfcomm(uint16_t channel) :
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80 | channel(channel), io(asio_io_service::alloc()) {
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81 | accept_retries = 0;
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82 | }
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83 |
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84 | rfcomm::~rfcomm() {
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85 | asio_io_service::free();
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86 | }
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87 |
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88 | void rfcomm::start() {
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89 |
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90 | // start io service
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91 | asio_io_service::start();
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92 |
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93 | // create acceptor
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94 | logging_info( "Binding to channel " << channel );
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95 | acceptor = new bluetooth::rfcomm::acceptor(io,
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96 | bluetooth::rfcomm::endpoint(bluetooth::rfcomm::get(), channel )
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97 | );
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98 |
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99 | send_data = new link_data();
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100 |
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101 | // start accepting
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102 | start_accept();
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103 | }
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104 |
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105 | void rfcomm::stop() {
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106 | logging_info( "Stopping asio rfcomm" );
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107 | }
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108 |
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109 | void rfcomm::send(const address_v* remote, const uint8_t* data, size_t size) {
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110 |
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111 | // get end-point
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112 | rfcomm_endpoint endpoint = *remote;
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113 | endpoint = convert(convert(endpoint));
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114 |
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115 | // try to find established connector
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116 | logging_debug("Trying to find a already existing link.");
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117 | link_info* info = NULL;
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118 | for (size_t i = 0; i < links.size(); i++)
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119 | if (links[i]->remote.mac() == endpoint.mac()) {
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120 | logging_debug("Using already established link");
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121 | info = links[i];
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122 | break;
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123 | }
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124 |
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125 | // not found, or not up? ->try to (re-)connect
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126 | if (info==NULL || !info->up || info->socket.is_open() ) {
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127 | logging_debug( "Connecting to " << endpoint.to_string() );
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128 | if (info != NULL && (!info->up || !info->socket.is_open())) {
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129 | logging_debug("Old link is down. Trying to re-establish link.");
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130 | } else {
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131 | info = new link_info(io);
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132 | }
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133 | info->connect_retries = 0;
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134 | info->remote = endpoint;
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135 | info->socket.async_connect( convert(endpoint), boost::bind(
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136 | &rfcomm::handle_connect, this,
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137 | boost::asio::placeholders::error, info
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138 | ));
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139 | asio_io_service::start();
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140 | }
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141 |
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142 | // copy message
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143 | link_data ldata;
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144 | ldata.size = size;
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145 | ldata.size_[0] = (size >> 24) & 0xFF;
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146 | ldata.size_[1] = (size >> 16) & 0xFF;
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147 | ldata.size_[2] = (size >> 8) & 0xFF;
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148 | ldata.size_[3] = (size >> 0) & 0xFF;
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149 | ldata.buffer = new uint8_t[size];
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150 | memcpy(ldata.buffer, data, size);
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151 |
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152 | // enqueue message
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153 | info->mutex.lock();
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154 | info->send_buffer.push_back(ldata);
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155 | info->mutex.unlock();
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156 |
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157 | // start writing
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158 | start_write(info);
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159 | }
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160 |
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161 | void rfcomm::send(const endpoint_set& endpoints, const uint8_t* data, size_t size) {
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162 | // send a message to each combination of mac-address and channel
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163 | BOOST_FOREACH( const mac_address mac, endpoints.bluetooth ) {
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164 | BOOST_FOREACH( const rfcomm_channel_address channel, endpoints.rfcomm ) {
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165 | rfcomm_endpoint endpoint(mac, channel);
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166 | address_vf vf = endpoint;
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167 | send(vf,data,size);
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168 | }
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169 | }
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170 | }
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171 |
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172 | void rfcomm::terminate(const address_v* local, const address_v* remote) {
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173 | // get end-point
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174 | rfcomm_endpoint endpoint = *remote;
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175 |
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176 | for (size_t i = 0; i < links.size(); i++)
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177 | if (links[i]->remote.mac() == endpoint.mac()) {
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178 | // close socket
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179 | shutdown(links[i]);
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180 | break;
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181 | }
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182 | }
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183 |
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184 | void rfcomm::register_listener(transport_listener* listener) {
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185 | this->listener = listener;
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186 | }
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187 |
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188 | void rfcomm::start_accept() {
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189 |
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190 | logging_info( "Waiting for connections ..." );
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191 |
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192 | // start accepting a connection
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193 | link_info* info = new link_info(io);
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194 | acceptor->async_accept(info->socket, boost::bind(
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195 | // bind parameters
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196 | &rfcomm::handle_accept, this,
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197 |
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198 | // handler parameters
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199 | boost::asio::placeholders::error, info
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200 | ));
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201 | asio_io_service::start();
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202 | }
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203 |
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204 | void rfcomm::handle_accept(const error_code& error, link_info* info) {
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205 | if (error) {
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206 | logging_error( "Error waiting for new connections. Error code: "<< error.message()
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207 | << ", trying to recover (attempt " << accept_retries << ")");
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208 |
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209 | // restart accepting
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210 | if (accept_retries<3) {
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211 | accept_retries++;
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212 | start_accept();
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213 | } else
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214 | delete info;
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215 |
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216 | return;
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217 | }
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218 |
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219 | links_mutex.lock();
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220 |
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221 | // convert endpoints
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222 | info->up = true;
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223 | info->local = convert( info->socket.local_endpoint() );
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224 | info->remote = convert( info->socket.remote_endpoint() );
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225 |
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226 | logging_debug("Accepted incoming connection from "
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227 | << info->remote.to_string() );
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228 |
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229 | // add to list
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230 | links.push_back(info);
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231 | links_mutex.unlock();
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232 |
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233 | // start i/o
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234 | start_read(info);
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235 | start_write(info);
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236 |
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237 | // restart accept
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238 | start_accept();
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239 | }
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240 |
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241 | void rfcomm::handle_connect( const error_code& error, link_info* info ) {
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242 | if (error) {
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243 | logging_error( "Can not connect. Error code: "
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244 | << error.message() << " Retrying ... "
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245 | "(attempt " << info->connect_retries << ")" );
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246 |
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247 | // do we retry this connection? yes->
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248 | if (info->connect_retries<3) {
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249 | // increase counter
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250 | info->connect_retries++;
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251 |
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252 | // retry connection attempt
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253 | info->socket.async_connect( convert(info->remote), boost::bind(
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254 | &rfcomm::handle_connect, this,
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255 | boost::asio::placeholders::error, info
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256 | ));
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257 |
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258 | } else { // no-> delete link and stop
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259 | return;
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260 | }
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261 | }
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262 |
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263 | // convert endpoints
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264 | info->up = true;
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265 | info->local = convert( info->socket.local_endpoint() );
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266 | info->remote = convert( info->socket.remote_endpoint() );
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267 |
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268 | logging_debug( "Connected to " << info->remote.to_string() );
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269 |
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270 | // add to list
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271 | links_mutex.lock();
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272 | links.push_back(info);
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273 | links_mutex.unlock();
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274 |
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275 | // start i/o
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276 | start_read(info);
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277 | start_write(info);
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278 | }
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279 |
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280 | void rfcomm::start_read(link_info* info) {
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281 | // start read
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282 | boost::asio::async_read(info->socket,
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283 |
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284 | // read size of packet
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285 | boost::asio::buffer(info->size_, 4),
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286 |
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287 | // bind handler
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288 | boost::bind(
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289 |
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290 | // bind parameters
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291 | &rfcomm::handle_read_header, this,
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292 |
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293 | // handler parameters
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294 | placeholders::error, placeholders::bytes_transferred, info
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295 | )
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296 | );
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297 | }
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298 |
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299 | void rfcomm::handle_read_header(const error_code& error, size_t bytes,
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300 | link_info* info) {
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301 |
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302 | // handle error
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303 | if (error) {
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304 | logging_error("Failed to receive message payload. Error code: "
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305 | << error.message() );
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306 | shutdown(info);
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307 | return;
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308 | }
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309 |
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310 | // ignore errors and wait for all data to be received
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311 | if (bytes != 4) return;
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312 |
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313 | // get size
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314 | info->size = (info->size_[0]<<24) + (info->size_[1] << 16) +
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315 | (info->size_[2]<< 8) + (info->size_[3] << 0);
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316 |
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317 | logging_debug( "Message header received -> receive message of size " << info->size );
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318 |
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319 | // allocate buffer
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320 | info->buffer = new uint8_t[info->size];
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321 |
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322 | // start read
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323 | boost::asio::async_read(info->socket,
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324 | // read size of packet
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325 | boost::asio::buffer(info->buffer, info->size),
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326 | // bind handler
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327 | boost::bind(
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328 | // bind parameters
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329 | &rfcomm::handle_read_data, this,
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330 | // handler parameters
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331 | placeholders::error, placeholders::bytes_transferred, info
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332 | )
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333 | );
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334 | }
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335 |
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336 | void rfcomm::handle_read_data(const error_code& error, size_t bytes,
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337 | link_info* info) {
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338 |
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339 | // check error
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340 | if (error) {
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341 | logging_error("Failed to receive message payload. Error code: "
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342 | << error.message() );
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343 | shutdown(info);
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344 | return;
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345 | }
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346 |
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347 | // wait for all data to be received
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348 | if (bytes != info->size)
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349 | return;
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350 |
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351 | logging_debug( "Received message of size " << info->size );
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352 |
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353 | // deliver data
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354 | listener->receive_message(this, info->local, info->remote, info->buffer, info->size );
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355 |
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356 | // free buffers and reset size buffer
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357 | delete [] info->buffer;
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358 | for (size_t i=0; i<4; i++) info->size_[i] = 0;
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359 |
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360 | start_read(info);
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361 | }
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362 |
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363 | void rfcomm::start_write( link_info* info ) {
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364 | boost::mutex::scoped_lock(info->mutex);
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365 |
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366 | // do not start writing if sending is in progress
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367 | if (info->sending || !info->up || info->send_buffer.size()==0) return;
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368 |
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369 | logging_debug("Sending messages ...");
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370 |
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371 | // safely remove data from deque
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372 | *send_data = info->send_buffer.front();
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373 | info->send_buffer.pop_front();
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374 |
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375 | boost::array<boost::asio::mutable_buffer, 2> buffer;
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376 | buffer[0] = boost::asio::buffer(send_data->size_,4);
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377 | buffer[1] = boost::asio::buffer(send_data->buffer,send_data->size);
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378 |
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379 | // start writing
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380 | boost::asio::async_write(info->socket,
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381 | // read size of packet
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382 | buffer,
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383 | // bind handler
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384 | boost::bind(
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385 | // bind parameters
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386 | &rfcomm::handle_write_data, this,
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387 | // handler parameters
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388 | placeholders::error, placeholders::bytes_transferred,
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389 | info, send_data->size, send_data->buffer
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390 | )
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391 | );
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392 | }
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393 |
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394 | void rfcomm::handle_write_data(const error_code& error, size_t bytes,
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395 | link_info* info, size_t size, uint8_t* buffer ) {
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396 |
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397 | // handle error
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398 | if (error) {
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399 | logging_error( "Message sent error. Error code: "<< error.message() );
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400 | shutdown(info);
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401 | return;
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402 | }
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403 |
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404 | // wait for all data to be sent
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405 | if (bytes != (size+4) )
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406 | return;
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407 |
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408 | logging_debug( "Message sent" );
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409 |
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410 | // free buffer
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411 | delete [] buffer;
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412 |
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413 | // restart-write
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414 | start_write(info);
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415 | }
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416 |
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417 | }} // namespace ariba::transport
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