source: source/ariba/utility/transport/rfcomm/rfcomm.cpp@ 5524

Last change on this file since 5524 was 5524, checked in by mies, 15 years ago
File size: 9.6 KB
Line 
1#include "rfcomm.hpp"
2
3#include "../asio/asio_io_service.h"
4#include "../asio/rfcomm.hpp"
5#include "../asio/bluetooth_endpoint.hpp"
6
7#include <boost/asio.hpp>
8#include <boost/thread.hpp>
9#include <boost/array.hpp>
10#include <memory.h>
11#include <deque>
12#include <cerrno>
13
14namespace ariba {
15namespace transport {
16
17use_logging_cpp(rfcomm)
18
19using namespace boost::asio;
20using namespace detail;
21using namespace std;
22
23using boost::system::error_code;
24
25class link_data {
26public:
27 uint8_t size_[4];
28 size_t size;
29 uint8_t* buffer;
30};
31
32class link_info {
33public:
34 link_info(io_service& io ) :
35 io(io), up(false), local(), remote(), socket(new bluetooth::rfcomm::socket(io)), connect_retries(0),
36 size(0), buffer(NULL), sending(false) {
37 }
38
39 ~link_info() {
40 delete socket;
41 }
42
43 void reinit() {
44 delete socket;
45 socket = new bluetooth::rfcomm::socket(io);
46 up = false;
47 }
48
49 io_service& io;
50
51 // state
52 bool up;
53 rfcomm_endpoint local, remote;
54 bluetooth::rfcomm::socket* socket;
55 int connect_retries;
56
57 // read buffer
58 uint8_t size_[4];
59 size_t size;
60 uint8_t* buffer;
61
62 // send buffer
63 bool sending;
64 boost::mutex mutex;
65 std::deque<link_data> send_buffer;
66};
67
68void rfcomm::shutdown(link_info* info) {
69 if (info != NULL && info->up) {
70 info->up = false;
71 info->socket->shutdown( bluetooth::rfcomm::socket::shutdown_both );
72 }
73}
74
75
76inline bluetooth::rfcomm::endpoint convert( const rfcomm_endpoint& endpoint ) {
77 return bluetooth::rfcomm::endpoint(
78 endpoint.mac().bluetooth(), endpoint.channel().value()
79 );
80}
81
82inline rfcomm_endpoint convert( const bluetooth::rfcomm::endpoint& endpoint ) {
83 mac_address mac;
84 mac.bluetooth( endpoint.address() );
85 rfcomm_channel_address channel;
86 channel.value( endpoint.channel() );
87 return rfcomm_endpoint( mac, channel );
88}
89
90
91rfcomm::rfcomm(uint16_t channel) :
92 channel(channel), io(asio_io_service::alloc()) {
93 accept_retries = 0;
94}
95
96rfcomm::~rfcomm() {
97 asio_io_service::free();
98}
99
100void rfcomm::start() {
101
102 // start io service
103 asio_io_service::start();
104
105 // create acceptor
106 logging_info( "Binding to channel " << channel );
107 acceptor = new bluetooth::rfcomm::acceptor(io,
108 bluetooth::rfcomm::endpoint(bluetooth::rfcomm::get(), channel )
109 );
110
111 send_data = new link_data();
112
113 // start accepting
114 start_accept();
115}
116
117void rfcomm::stop() {
118 logging_info( "Stopping asio rfcomm" );
119}
120
121void rfcomm::send(const address_v* remote, const uint8_t* data, size_t size) {
122
123 // get end-point
124 rfcomm_endpoint endpoint = *remote;
125 endpoint = convert(convert(endpoint));
126
127 // try to find established connector
128 logging_debug("Trying to find a already existing link.");
129 link_info* info = NULL;
130 for (size_t i = 0; i < links.size(); i++)
131 if (links[i]->remote.mac() == endpoint.mac()) {
132 logging_debug("Using already established link");
133 info = links[i];
134 break;
135 }
136
137 // not found, or not up? ->try to (re-)connect
138 if (info==NULL || !info->up || !info->socket->is_open() ) {
139 logging_debug( "Connecting to " << endpoint.to_string() );
140 if (info != NULL && (!info->up || !info->socket->is_open())) {
141 logging_error("Old link is down. Trying to re-establish link.");
142 info->reinit();
143 } else {
144 info = new link_info(io);
145 }
146 info->connect_retries = 0;
147 info->remote = endpoint;
148 info->socket->async_connect( convert(endpoint), boost::bind(
149 &rfcomm::handle_connect, this,
150 boost::asio::placeholders::error, info
151 ));
152 }
153
154 // copy message
155 link_data ldata;
156 ldata.size = size;
157 ldata.size_[0] = (size >> 24) & 0xFF;
158 ldata.size_[1] = (size >> 16) & 0xFF;
159 ldata.size_[2] = (size >> 8) & 0xFF;
160 ldata.size_[3] = (size >> 0) & 0xFF;
161 ldata.buffer = new uint8_t[size];
162 memcpy(ldata.buffer, data, size);
163
164 // enqueue message
165 info->mutex.lock();
166 info->send_buffer.push_back(ldata);
167 info->mutex.unlock();
168
169 // start writing
170 io.post( boost::bind( &rfcomm::start_write, this, info) );
171}
172
173void rfcomm::send(const endpoint_set& endpoints, const uint8_t* data, size_t size) {
174 // send a message to each combination of mac-address and channel
175 BOOST_FOREACH( const mac_address mac, endpoints.bluetooth ) {
176 BOOST_FOREACH( const rfcomm_channel_address channel, endpoints.rfcomm ) {
177 rfcomm_endpoint endpoint(mac, channel);
178 address_vf vf = endpoint;
179 send(vf,data,size);
180 }
181 }
182}
183
184void rfcomm::terminate(const address_v* local, const address_v* remote) {
185 // get end-point
186 rfcomm_endpoint endpoint = *remote;
187
188 for (size_t i = 0; i < links.size(); i++)
189 if (links[i]->remote.mac() == endpoint.mac()) {
190 // close socket
191 shutdown(links[i]);
192 break;
193 }
194}
195
196void rfcomm::register_listener(transport_listener* listener) {
197 this->listener = listener;
198}
199
200void rfcomm::start_accept() {
201
202 logging_info( "Waiting for connections ..." );
203
204 // start accepting a connection
205 link_info* info = new link_info(io);
206 acceptor->async_accept(*info->socket, boost::bind(
207 // bind parameters
208 &rfcomm::handle_accept, this,
209
210 // handler parameters
211 boost::asio::placeholders::error, info
212 ));
213 asio_io_service::start();
214}
215
216void rfcomm::handle_accept(const error_code& error, link_info* info) {
217 if (error) {
218 logging_error( "Error waiting for new connections. Error code: "<< error.message()
219 << ", trying to recover (attempt " << accept_retries << ")");
220
221 // restart accepting
222 if (accept_retries<3) {
223 accept_retries++;
224 start_accept();
225 } else
226 delete info;
227
228 return;
229 }
230
231 links_mutex.lock();
232
233 // convert endpoints
234 info->up = true;
235 info->local = convert( info->socket->local_endpoint() );
236 info->remote = convert( info->socket->remote_endpoint() );
237
238 logging_debug("Accepted incoming connection from "
239 << info->remote.to_string() );
240
241 // add to list
242 links.push_back(info);
243 links_mutex.unlock();
244
245 // start i/o
246 start_read(info);
247 start_write(info);
248
249 // restart accept
250 start_accept();
251}
252
253void rfcomm::handle_connect( const error_code& error, link_info* info ) {
254 if (error) {
255 logging_error( "Can not connect. Error code: "
256 << error.message() << " Retrying ... "
257 "(attempt " << info->connect_retries << ")" );
258
259 // do we retry this connection? yes->
260 if (info->connect_retries<3) {
261 // increase counter
262 info->connect_retries++;
263 info->reinit();
264
265 // retry connection attempt
266 info->socket->async_connect( convert(info->remote), boost::bind(
267 &rfcomm::handle_connect, this,
268 boost::asio::placeholders::error, info
269 ));
270
271 } else { // no-> delete link and stop
272 return;
273 }
274 }
275
276 // convert endpoints
277 info->up = true;
278 info->local = convert( info->socket->local_endpoint() );
279 info->remote = convert( info->socket->remote_endpoint() );
280
281 logging_debug( "Connected to " << info->remote.to_string() );
282
283 // add to list
284 links_mutex.lock();
285 links.push_back(info);
286 links_mutex.unlock();
287
288 // start i/o
289 start_read(info);
290 start_write(info);
291}
292
293void rfcomm::start_read(link_info* info) {
294 logging_debug("Start reading ...");
295
296 // start read
297 boost::asio::async_read(*info->socket,
298
299 // read size of packet
300 boost::asio::buffer(info->size_, 4),
301
302 // bind handler
303 boost::bind(
304
305 // bind parameters
306 &rfcomm::handle_read_header, this,
307
308 // handler parameters
309 placeholders::error, placeholders::bytes_transferred, info
310 )
311 );
312}
313
314void rfcomm::handle_read_header(const error_code& error, size_t bytes,
315 link_info* info) {
316
317 // handle error
318 if (error) {
319 logging_error("Failed to receive message payload. Error code: "
320 << error.message() );
321 shutdown(info);
322 return;
323 }
324
325 // ignore errors and wait for all data to be received
326 if (bytes != 4) return;
327
328 // get size
329 info->size = (info->size_[0]<<24) + (info->size_[1] << 16) +
330 (info->size_[2]<< 8) + (info->size_[3] << 0);
331
332 // allocate buffer
333 info->buffer = new uint8_t[info->size];
334
335 // start read
336 boost::asio::async_read(*info->socket,
337 // read size of packet
338 boost::asio::buffer(info->buffer, info->size),
339 // bind handler
340 boost::bind(
341 // bind parameters
342 &rfcomm::handle_read_data, this,
343 // handler parameters
344 placeholders::error, placeholders::bytes_transferred, info
345 )
346 );
347}
348
349void rfcomm::handle_read_data(const error_code& error, size_t bytes,
350 link_info* info) {
351
352 // check error
353 if (error) {
354 logging_error("Failed to receive message payload. Error: " << error.message() );
355 shutdown(info);
356 return;
357 }
358
359 // wait for all data to be received
360 if (bytes != info->size)
361 return;
362
363 // deliver data
364 listener->receive_message(this, info->local, info->remote, info->buffer, info->size );
365
366 // free buffers and reset size buffer
367 delete [] info->buffer;
368 for (size_t i=0; i<4; i++) info->size_[i] = 0;
369
370 start_read(info);
371}
372
373void rfcomm::start_write( link_info* info ) {
374 // do not start writing if sending is in progress
375 if (info->sending || !info->up || info->send_buffer.size()==0) return;
376
377 // set sending flag
378 info->sending = true;
379
380 // safely remove data from deque
381 *send_data = info->send_buffer.front();
382 info->send_buffer.pop_front();
383
384 boost::array<boost::asio::mutable_buffer, 2> buffer;
385 buffer[0] = boost::asio::buffer(send_data->size_,4);
386 buffer[1] = boost::asio::buffer(send_data->buffer,send_data->size);
387
388 // start writing
389 boost::asio::async_write(*info->socket,
390 // read size of packet
391 buffer,
392 // bind handler
393 boost::bind(
394 // bind parameters
395 &rfcomm::handle_write_data, this,
396 // handler parameters
397 placeholders::error, placeholders::bytes_transferred,
398 info, send_data->size, send_data->buffer
399 )
400 );
401}
402
403void rfcomm::handle_write_data(const error_code& error, size_t bytes,
404 link_info* info, size_t size, uint8_t* buffer ) {
405
406 // handle error
407 if (error) {
408 logging_error( "Message sent error. Error: " << error.message() );
409 info->sending = false;
410 shutdown(info);
411 return;
412 }
413
414 // wait for all data to be sent
415 if (bytes != (size+4) )
416 return;
417
418 logging_debug( "Message sent" );
419
420 // free buffer
421 delete [] buffer;
422 info->sending = false;
423
424 // restart-write
425 start_write(info);
426}
427
428}} // namespace ariba::transport
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