3 #include <netinet/in.h>
10 #include <sys/sendfile.h>
11 #include <sys/socket.h>
12 #include <sys/types.h>
23 #include "accesslog.h"
25 #include "metacube2.h"
32 #ifndef SO_MAX_PACING_RATE
33 #define SO_MAX_PACING_RATE 47
38 extern AccessLogThread *access_log;
42 inline bool is_equal(timespec a, timespec b)
44 return a.tv_sec == b.tv_sec &&
45 a.tv_nsec == b.tv_nsec;
48 inline bool is_earlier(timespec a, timespec b)
50 if (a.tv_sec != b.tv_sec)
51 return a.tv_sec < b.tv_sec;
52 return a.tv_nsec < b.tv_nsec;
59 epoll_fd = epoll_create(1024); // Size argument is ignored.
61 log_perror("epoll_fd");
71 vector<ClientStats> Server::get_client_stats() const
73 vector<ClientStats> ret;
75 lock_guard<mutex> lock(mu);
76 for (const auto &fd_and_client : clients) {
77 ret.push_back(fd_and_client.second.get_stats());
82 void Server::do_work()
84 while (!should_stop()) {
85 // Wait until there's activity on at least one of the fds,
86 // or 20 ms (about one frame at 50 fps) has elapsed.
88 // We could in theory wait forever and rely on wakeup()
89 // from add_client_deferred() and add_data_deferred(),
90 // but wakeup is a pretty expensive operation, and the
91 // two threads might end up fighting over a lock, so it's
92 // seemingly (much) more efficient to just have a timeout here.
93 int nfds = epoll_pwait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS, &sigset_without_usr1_block);
94 if (nfds == -1 && errno != EINTR) {
95 log_perror("epoll_wait");
99 lock_guard<mutex> lock(mu); // We release the mutex between iterations.
101 process_queued_data();
103 // Process each client where we have socket activity.
104 for (int i = 0; i < nfds; ++i) {
105 Client *client = reinterpret_cast<Client *>(events[i].data.ptr);
107 if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
108 close_client(client);
112 process_client(client);
115 // Process each client where its stream has new data,
116 // even if there was no socket activity.
117 for (unique_ptr<Stream> &stream : streams) {
118 vector<Client *> to_process;
119 swap(stream->to_process, to_process);
120 for (Client *client : to_process) {
121 process_client(client);
125 // Finally, go through each client to see if it's timed out
126 // in the READING_REQUEST state. (Seemingly there are clients
127 // that can hold sockets up for days at a time without sending
129 timespec timeout_time;
130 if (clock_gettime(CLOCK_MONOTONIC_COARSE, &timeout_time) == -1) {
131 log_perror("clock_gettime(CLOCK_MONOTONIC_COARSE)");
134 timeout_time.tv_sec -= REQUEST_READ_TIMEOUT_SEC;
135 while (!clients_ordered_by_connect_time.empty()) {
136 const pair<timespec, int> &connect_time_and_fd = clients_ordered_by_connect_time.front();
138 // See if we have reached the end of clients to process.
139 if (is_earlier(timeout_time, connect_time_and_fd.first)) {
143 // If this client doesn't exist anymore, just ignore it
144 // (it was deleted earlier).
145 auto client_it = clients.find(connect_time_and_fd.second);
146 if (client_it == clients.end()) {
147 clients_ordered_by_connect_time.pop();
150 Client *client = &client_it->second;
151 if (!is_equal(client->connect_time, connect_time_and_fd.first)) {
152 // Another client has taken this fd in the meantime.
153 clients_ordered_by_connect_time.pop();
157 if (client->state != Client::READING_REQUEST) {
158 // Only READING_REQUEST can time out.
159 clients_ordered_by_connect_time.pop();
164 close_client(client);
165 clients_ordered_by_connect_time.pop();
170 CubemapStateProto Server::serialize(unordered_map<const string *, size_t> *short_response_pool)
172 // We don't serialize anything queued, so empty the queues.
173 process_queued_data();
175 // Set all clients in a consistent state before serializing
176 // (ie., they have no remaining lost data). Otherwise, increasing
177 // the backlog could take clients into a newly valid area of the backlog,
178 // sending a stream of zeros instead of skipping the data as it should.
180 // TODO: Do this when clients are added back from serialized state instead;
181 // it would probably be less wasteful.
182 for (auto &fd_and_client : clients) {
183 skip_lost_data(&fd_and_client.second);
186 CubemapStateProto serialized;
187 for (const auto &fd_and_client : clients) {
188 serialized.add_clients()->MergeFrom(fd_and_client.second.serialize(short_response_pool));
190 for (unique_ptr<Stream> &stream : streams) {
191 serialized.add_streams()->MergeFrom(stream->serialize());
196 void Server::add_client_deferred(int sock, Acceptor *acceptor)
198 lock_guard<mutex> lock(queued_clients_mutex);
199 queued_add_clients.push_back(std::make_pair(sock, acceptor));
202 void Server::add_client(int sock, Acceptor *acceptor)
204 const bool is_tls = acceptor->is_tls();
205 auto inserted = clients.insert(make_pair(sock, Client(sock)));
206 assert(inserted.second == true); // Should not already exist.
207 Client *client_ptr = &inserted.first->second;
209 // Connection timestamps must be nondecreasing. I can't find any guarantee
210 // that even the monotonic clock can't go backwards by a small amount
211 // (think switching between CPUs with non-synchronized TSCs), so if
212 // this actually should happen, we hack around it by fudging
214 if (!clients_ordered_by_connect_time.empty() &&
215 is_earlier(client_ptr->connect_time, clients_ordered_by_connect_time.back().first)) {
216 client_ptr->connect_time = clients_ordered_by_connect_time.back().first;
218 clients_ordered_by_connect_time.push(make_pair(client_ptr->connect_time, sock));
220 // Start listening on data from this socket.
223 // Even in the initial state (READING_REQUEST), TLS needs to
224 // send data for the handshake, and thus might end up needing
225 // to know about EPOLLOUT.
226 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLRDHUP;
228 // EPOLLOUT will be added once we go out of READING_REQUEST.
229 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
231 ev.data.ptr = client_ptr;
232 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
233 log_perror("epoll_ctl(EPOLL_CTL_ADD)");
238 assert(tls_server_contexts.count(acceptor));
239 client_ptr->tls_context = tls_accept(tls_server_contexts[acceptor]);
240 if (client_ptr->tls_context == nullptr) {
241 log(ERROR, "tls_accept() failed");
242 close_client(client_ptr);
245 tls_make_exportable(client_ptr->tls_context, 1);
248 process_client(client_ptr);
251 void Server::add_client_from_serialized(const ClientProto &client, const vector<shared_ptr<const string>> &short_responses)
253 lock_guard<mutex> lock(mu);
255 int stream_index = lookup_stream_by_url(client.url());
256 if (stream_index == -1) {
257 assert(client.state() != Client::SENDING_DATA);
260 stream = streams[stream_index].get();
262 auto inserted = clients.insert(make_pair(client.sock(), Client(client, short_responses, stream)));
263 assert(inserted.second == true); // Should not already exist.
264 Client *client_ptr = &inserted.first->second;
266 // Connection timestamps must be nondecreasing.
267 assert(clients_ordered_by_connect_time.empty() ||
268 !is_earlier(client_ptr->connect_time, clients_ordered_by_connect_time.back().first));
269 clients_ordered_by_connect_time.push(make_pair(client_ptr->connect_time, client.sock()));
271 // Start listening on data from this socket.
273 if (client.state() == Client::READING_REQUEST) {
274 // See the corresponding comment in Server::add_client().
275 if (client.has_tls_context()) {
276 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLRDHUP;
278 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
281 // If we don't have more data for this client, we'll be putting it into
282 // the sleeping array again soon.
283 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
285 ev.data.ptr = client_ptr;
286 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client.sock(), &ev) == -1) {
287 log_perror("epoll_ctl(EPOLL_CTL_ADD)");
291 if (client_ptr->state == Client::WAITING_FOR_KEYFRAME ||
292 client_ptr->state == Client::PREBUFFERING ||
293 (client_ptr->state == Client::SENDING_DATA &&
294 client_ptr->stream_pos == client_ptr->stream->bytes_received)) {
295 client_ptr->stream->put_client_to_sleep(client_ptr);
297 process_client(client_ptr);
301 int Server::lookup_stream_by_url(const string &url) const
303 map<string, int>::const_iterator stream_url_it = stream_url_map.find(url);
304 if (stream_url_it == stream_url_map.end()) {
307 return stream_url_it->second;
310 int Server::add_stream(const string &url,
311 const string &hls_url,
313 size_t prebuffering_bytes,
314 Stream::Encoding encoding,
315 Stream::Encoding src_encoding,
316 unsigned hls_frag_duration,
317 size_t hls_backlog_margin,
318 const string &allow_origin)
320 lock_guard<mutex> lock(mu);
321 stream_url_map.insert(make_pair(url, streams.size()));
322 if (!hls_url.empty()) {
323 stream_hls_url_map.insert(make_pair(hls_url, streams.size()));
325 streams.emplace_back(new Stream(url, backlog_size, prebuffering_bytes, encoding, src_encoding, hls_frag_duration, hls_backlog_margin, allow_origin));
326 return streams.size() - 1;
329 int Server::add_stream_from_serialized(const StreamProto &stream, int data_fd)
331 lock_guard<mutex> lock(mu);
332 stream_url_map.insert(make_pair(stream.url(), streams.size()));
333 // stream_hls_url_map will be updated in register_hls_url(), since it is not part
334 // of the serialized state (it will always be picked out from the configuration).
335 streams.emplace_back(new Stream(stream, data_fd));
336 return streams.size() - 1;
339 void Server::set_backlog_size(int stream_index, size_t new_size)
341 lock_guard<mutex> lock(mu);
342 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
343 streams[stream_index]->set_backlog_size(new_size);
346 void Server::set_prebuffering_bytes(int stream_index, size_t new_amount)
348 lock_guard<mutex> lock(mu);
349 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
350 streams[stream_index]->prebuffering_bytes = new_amount;
353 void Server::set_encoding(int stream_index, Stream::Encoding encoding)
355 lock_guard<mutex> lock(mu);
356 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
357 streams[stream_index]->encoding = encoding;
360 void Server::set_src_encoding(int stream_index, Stream::Encoding encoding)
362 lock_guard<mutex> lock(mu);
363 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
364 streams[stream_index]->src_encoding = encoding;
367 void Server::set_hls_frag_duration(int stream_index, unsigned hls_frag_duration)
369 lock_guard<mutex> lock(mu);
370 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
371 streams[stream_index]->hls_frag_duration = hls_frag_duration;
374 void Server::set_hls_backlog_margin(int stream_index, size_t hls_backlog_margin)
376 lock_guard<mutex> lock(mu);
377 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
378 assert(hls_backlog_margin >= 0);
379 assert(hls_backlog_margin < streams[stream_index]->backlog_size);
380 streams[stream_index]->hls_backlog_margin = hls_backlog_margin;
383 void Server::set_allow_origin(int stream_index, const string &allow_origin)
385 lock_guard<mutex> lock(mu);
386 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
387 streams[stream_index]->allow_origin = allow_origin;
390 void Server::register_hls_url(int stream_index, const string &hls_url)
392 lock_guard<mutex> lock(mu);
393 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
394 assert(!hls_url.empty());
395 stream_hls_url_map.insert(make_pair(hls_url, stream_index));
398 void Server::set_header(int stream_index, const string &http_header, const string &stream_header)
400 lock_guard<mutex> lock(mu);
401 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
402 Stream *stream = streams[stream_index].get();
403 stream->http_header = http_header;
405 if (stream_header != stream->stream_header) {
406 // We cannot start at any of the older starting points anymore,
407 // since they'd get the wrong header for the stream (not to mention
408 // that a changed header probably means the stream restarted,
409 // which means any client starting on the old one would probably
410 // stop playing properly at the change point). Next block
411 // should be a suitable starting point (if not, something is
412 // pretty strange), so it will fill up again soon enough.
413 stream->suitable_starting_points.clear();
415 if (!stream->fragments.empty()) {
416 stream->fragments.clear();
417 ++stream->discontinuity_counter;
418 stream->clear_hls_playlist_cache();
421 stream->stream_header = stream_header;
424 void Server::set_pacing_rate(int stream_index, uint32_t pacing_rate)
426 lock_guard<mutex> lock(mu);
427 assert(clients.empty());
428 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
429 streams[stream_index]->pacing_rate = pacing_rate;
432 void Server::add_gen204(const std::string &url, const std::string &allow_origin)
434 lock_guard<mutex> lock(mu);
435 assert(clients.empty());
436 ping_url_map[url] = allow_origin;
439 void Server::create_tls_context_for_acceptor(const Acceptor *acceptor)
441 assert(acceptor->is_tls());
443 bool is_server = true;
444 TLSContext *server_context = tls_create_context(is_server, TLS_V12);
446 const string &cert = acceptor->get_certificate_chain();
447 int num_cert = tls_load_certificates(server_context, reinterpret_cast<const unsigned char *>(cert.data()), cert.size());
448 assert(num_cert > 0); // Should have been checked by config earlier.
450 const string &key = acceptor->get_private_key();
451 int num_key = tls_load_private_key(server_context, reinterpret_cast<const unsigned char *>(key.data()), key.size());
452 assert(num_key > 0); // Should have been checked by config earlier.
454 tls_server_contexts.insert(make_pair(acceptor, server_context));
457 void Server::add_data_deferred(int stream_index, const char *data, size_t bytes, uint16_t metacube_flags, const RationalPTS &pts)
459 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
460 streams[stream_index]->add_data_deferred(data, bytes, metacube_flags, pts);
463 // See the .h file for postconditions after this function.
464 void Server::process_client(Client *client)
466 switch (client->state) {
467 case Client::READING_REQUEST: {
468 if (client->tls_context != nullptr) {
469 if (send_pending_tls_data(client)) {
470 // send_pending_tls_data() hit postconditions #1 or #4.
476 // Try to read more of the request.
479 if (client->tls_context == nullptr) {
480 ret = read_nontls_data(client, buf, sizeof(buf));
482 // read_nontls_data() hit postconditions #1 or #2.
486 ret = read_tls_data(client, buf, sizeof(buf));
488 // read_tls_data() hit postconditions #1, #2 or #4.
493 RequestParseStatus status = wait_for_double_newline(&client->request, buf, ret);
496 case RP_OUT_OF_SPACE:
497 log(WARNING, "[%s] Client sent overlong request!", client->remote_addr.c_str());
498 close_client(client);
500 case RP_NOT_FINISHED_YET:
501 // OK, we don't have the entire header yet. Fine; we'll get it later.
502 // See if there's more data for us.
503 goto read_request_again;
505 log(WARNING, "[%s] Junk data after request!", client->remote_addr.c_str());
506 close_client(client);
512 assert(status == RP_FINISHED);
514 if (client->tls_context && !client->in_ktls_mode && tls_established(client->tls_context)) {
515 // We're ready to enter kTLS mode, unless we still have some
516 // handshake data to send (which then must be sent as non-kTLS).
517 if (send_pending_tls_data(client)) {
518 // send_pending_tls_data() hit postconditions #1 or #4.
521 ret = tls_make_ktls(client->tls_context, client->sock);
523 log_tls_error("tls_make_ktls", ret);
524 close_client(client);
527 client->in_ktls_mode = true;
530 int error_code = parse_request(client);
531 if (error_code == 200) {
532 if (client->serving_hls_playlist) {
533 construct_hls_playlist(client);
535 construct_stream_header(client);
537 } else if (error_code == 204) {
538 construct_204(client);
540 construct_error(client, error_code);
543 // We've changed states, so fall through.
544 assert(client->state == Client::SENDING_SHORT_RESPONSE ||
545 client->state == Client::SENDING_HEADER);
547 case Client::SENDING_SHORT_RESPONSE:
548 case Client::SENDING_HEADER: {
549 sending_header_or_short_response_again:
552 ret = write(client->sock,
553 client->header_or_short_response->data() + client->header_or_short_response_bytes_sent,
554 client->header_or_short_response->size() - client->header_or_short_response_bytes_sent);
555 } while (ret == -1 && errno == EINTR);
557 if (ret == -1 && errno == EAGAIN) {
558 // We're out of socket space, so now we're at the “low edge” of epoll's
559 // edge triggering. epoll will tell us when there is more room, so for now,
561 // This is postcondition #4.
566 // Error! Postcondition #1.
568 close_client(client);
572 client->header_or_short_response_bytes_sent += ret;
573 assert(client->header_or_short_response_bytes_sent <= client->header_or_short_response->size());
575 if (client->header_or_short_response_bytes_sent < client->header_or_short_response->size()) {
576 // We haven't sent all yet. Fine; go another round.
577 goto sending_header_or_short_response_again;
580 // We're done sending the header or error! Clear it to release some memory.
581 client->header_or_short_response = nullptr;
582 client->header_or_short_response_holder.clear();
583 client->header_or_short_response_ref.reset();
585 if (client->state == Client::SENDING_SHORT_RESPONSE) {
586 if (more_requests(client)) {
587 // We're done sending the error, but should keep on reading new requests.
588 goto read_request_again;
590 // We're done sending the error, so now close.
591 // This is postcondition #1.
592 close_client(client);
597 Stream *stream = client->stream;
598 if (client->stream_pos == Client::STREAM_POS_AT_START) {
599 // Start sending from the beginning of the backlog.
600 client->stream_pos = min<size_t>(
601 stream->bytes_received - stream->backlog_size,
603 client->state = Client::SENDING_DATA;
605 } else if (client->stream_pos_end != Client::STREAM_POS_NO_END) {
606 // We're sending a fragment, and should have all of it,
607 // so start sending right away.
608 assert(client->stream_pos >= 0);
609 client->state = Client::SENDING_DATA;
611 } else if (stream->prebuffering_bytes == 0) {
612 // Start sending from the first keyframe we get. In other
613 // words, we won't send any of the backlog, but we'll start
614 // sending immediately as we get the next keyframe block.
615 // Note that this is functionally identical to the next if branch,
616 // except that we save a binary search.
617 assert(client->stream_pos == Client::STREAM_POS_AT_END);
618 assert(client->stream_pos_end == Client::STREAM_POS_NO_END);
619 client->stream_pos = stream->bytes_received;
620 client->state = Client::WAITING_FOR_KEYFRAME;
622 // We're not going to send anything to the client before we have
623 // N bytes. However, this wait might be boring; we can just as well
624 // use it to send older data if we have it. We use lower_bound()
625 // so that we are conservative and never add extra latency over just
626 // waiting (assuming CBR or nearly so); otherwise, we could want e.g.
627 // 100 kB prebuffer but end up sending a 10 MB GOP.
628 assert(client->stream_pos == Client::STREAM_POS_AT_END);
629 assert(client->stream_pos_end == Client::STREAM_POS_NO_END);
630 deque<size_t>::const_iterator starting_point_it =
631 lower_bound(stream->suitable_starting_points.begin(),
632 stream->suitable_starting_points.end(),
633 stream->bytes_received - stream->prebuffering_bytes);
634 if (starting_point_it == stream->suitable_starting_points.end()) {
635 // None found. Just put us at the end, and then wait for the
636 // first keyframe to appear.
637 client->stream_pos = stream->bytes_received;
638 client->state = Client::WAITING_FOR_KEYFRAME;
640 client->stream_pos = *starting_point_it;
641 client->state = Client::PREBUFFERING;
647 case Client::WAITING_FOR_KEYFRAME: {
648 Stream *stream = client->stream;
649 if (stream->suitable_starting_points.empty() ||
650 client->stream_pos > stream->suitable_starting_points.back()) {
651 // We haven't received a keyframe since this stream started waiting,
652 // so keep on waiting for one.
653 // This is postcondition #3.
654 stream->put_client_to_sleep(client);
657 client->stream_pos = stream->suitable_starting_points.back();
658 client->state = Client::PREBUFFERING;
661 case Client::PREBUFFERING: {
663 Stream *stream = client->stream;
664 size_t bytes_to_send = stream->bytes_received - client->stream_pos;
665 assert(bytes_to_send <= stream->backlog_size);
666 if (bytes_to_send < stream->prebuffering_bytes) {
667 // We don't have enough bytes buffered to start this client yet.
668 // This is postcondition #3.
669 stream->put_client_to_sleep(client);
672 client->state = Client::SENDING_DATA;
675 case Client::SENDING_DATA: {
677 skip_lost_data(client);
678 Stream *stream = client->stream;
681 size_t bytes_to_send;
682 if (client->stream_pos_end == Client::STREAM_POS_NO_END) {
683 bytes_to_send = stream->bytes_received - client->stream_pos;
685 bytes_to_send = client->stream_pos_end - client->stream_pos;
687 assert(bytes_to_send <= stream->backlog_size);
688 if (bytes_to_send == 0) {
689 if (client->stream_pos == client->stream_pos_end) { // We have a definite end, and we're at it.
690 if (more_requests(client)) {
691 // We're done sending the fragment, but should keep on reading new requests.
692 goto read_request_again;
694 // We're done sending the fragment, so now close.
695 // This is postcondition #1.
696 close_client(client);
702 // See if we need to split across the circular buffer.
703 bool more_data = false;
704 if ((client->stream_pos % stream->backlog_size) + bytes_to_send > stream->backlog_size) {
705 bytes_to_send = stream->backlog_size - (client->stream_pos % stream->backlog_size);
711 off_t offset = client->stream_pos % stream->backlog_size;
712 ret = sendfile(client->sock, stream->data_fd, &offset, bytes_to_send);
713 } while (ret == -1 && errno == EINTR);
715 if (ret == -1 && errno == EAGAIN) {
716 // We're out of socket space, so return; epoll will wake us up
717 // when there is more room.
718 // This is postcondition #4.
722 // Error, close; postcondition #1.
723 log_perror("sendfile");
724 close_client(client);
727 client->stream_pos += ret;
728 client->bytes_sent += ret;
730 assert(client->stream_pos_end == Client::STREAM_POS_NO_END || client->stream_pos <= client->stream_pos_end);
731 if (client->stream_pos == client->stream_pos_end) {
732 goto sending_data_again; // Will see that bytes_to_send == 0 and end.
733 } else if (client->stream_pos == stream->bytes_received) {
734 // We don't have any more data for this client, so put it to sleep.
735 // This is postcondition #3.
736 stream->put_client_to_sleep(client);
737 } else if (more_data && size_t(ret) == bytes_to_send) {
738 goto sending_data_again;
740 // We'll also get here for postcondition #4 (similar to the EAGAIN path above).
748 bool Server::send_pending_tls_data(Client *client)
750 // See if there's data from the TLS library to write.
751 if (client->tls_data_to_send == nullptr) {
752 client->tls_data_to_send = tls_get_write_buffer(client->tls_context, &client->tls_data_left_to_send);
753 if (client->tls_data_to_send == nullptr) {
754 // Really no data to send.
762 ret = write(client->sock, client->tls_data_to_send, client->tls_data_left_to_send);
763 } while (ret == -1 && errno == EINTR);
764 assert(ret < 0 || size_t(ret) <= client->tls_data_left_to_send);
766 if (ret == -1 && errno == EAGAIN) {
767 // We're out of socket space, so now we're at the “low edge” of epoll's
768 // edge triggering. epoll will tell us when there is more room, so for now,
770 // This is postcondition #4.
774 // Error! Postcondition #1.
776 close_client(client);
779 if (ret > 0 && size_t(ret) == client->tls_data_left_to_send) {
780 // All data has been sent, so we don't need to go to sleep.
781 tls_buffer_clear(client->tls_context);
782 client->tls_data_to_send = nullptr;
786 // More data to send, so try again.
787 client->tls_data_to_send += ret;
788 client->tls_data_left_to_send -= ret;
789 goto send_data_again;
792 int Server::read_nontls_data(Client *client, char *buf, size_t max_size)
796 ret = read(client->sock, buf, max_size);
797 } while (ret == -1 && errno == EINTR);
799 if (ret == -1 && errno == EAGAIN) {
800 // No more data right now. Nothing to do.
801 // This is postcondition #2.
806 close_client(client);
810 // OK, the socket is closed.
811 close_client(client);
818 int Server::read_tls_data(Client *client, char *buf, size_t max_size)
823 ret = read(client->sock, buf, max_size);
824 } while (ret == -1 && errno == EINTR);
826 if (ret == -1 && errno == EAGAIN) {
827 // No more data right now. Nothing to do.
828 // This is postcondition #2.
833 close_client(client);
837 // OK, the socket is closed.
838 close_client(client);
842 // Give it to the TLS library.
843 int err = tls_consume_stream(client->tls_context, reinterpret_cast<const unsigned char *>(buf), ret, nullptr);
845 log_tls_error("tls_consume_stream", err);
846 close_client(client);
850 // Not consumed any data. See if we can read more.
854 // Read any decrypted data available for us. (We can reuse buf, since it's free now.)
855 ret = tls_read(client->tls_context, reinterpret_cast<unsigned char *>(buf), max_size);
857 // No decrypted data for us yet, but there might be some more handshaking
858 // to send. Do that if needed, then look for more data.
859 if (send_pending_tls_data(client)) {
860 // send_pending_tls_data() hit postconditions #1 or #4.
866 log_tls_error("tls_read", ret);
867 close_client(client);
875 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
876 // but resync will be the mux's problem.
877 void Server::skip_lost_data(Client *client)
879 Stream *stream = client->stream;
880 if (stream == nullptr) {
883 size_t bytes_to_send = stream->bytes_received - client->stream_pos;
884 if (bytes_to_send > stream->backlog_size) {
885 size_t bytes_lost = bytes_to_send - stream->backlog_size;
886 client->bytes_lost += bytes_lost;
887 ++client->num_loss_events;
888 if (!client->close_after_response) {
889 assert(client->stream_pos_end != Client::STREAM_POS_NO_END);
891 // We've already sent a Content-length, so we can't just skip data.
892 // Close the connection immediately and hope the other side
893 // is able to figure out that there was an error and it needs to skip.
894 client->close_after_response = true;
895 client->stream_pos = client->stream_pos_end;
897 client->stream_pos = stream->bytes_received - stream->backlog_size;
902 int Server::parse_request(Client *client)
904 vector<string> lines = split_lines(client->request);
905 client->request.clear();
907 return 400; // Bad request (empty).
910 // Parse the headers, for logging purposes.
911 // TODO: Case-insensitivity.
912 multimap<string, string> headers = extract_headers(lines, client->remote_addr);
913 multimap<string, string>::const_iterator referer_it = headers.find("Referer");
914 if (referer_it != headers.end()) {
915 client->referer = referer_it->second;
917 multimap<string, string>::const_iterator user_agent_it = headers.find("User-Agent");
918 if (user_agent_it != headers.end()) {
919 client->user_agent = user_agent_it->second;
922 vector<string> request_tokens = split_tokens(lines[0]);
923 if (request_tokens.size() < 3) {
924 return 400; // Bad request (empty).
926 if (request_tokens[0] != "GET") {
927 return 400; // Should maybe be 405 instead?
930 string url = request_tokens[1];
932 if (url.size() > 8 && url.find("?backlog") == url.size() - 8) {
933 client->stream_pos = Client::STREAM_POS_AT_START;
934 url = url.substr(0, url.size() - 8);
936 size_t pos = url.find("?frag=");
937 if (pos != string::npos) {
938 // Parse an endpoint of the type /stream.mp4?frag=1234-5678.
939 const char *ptr = url.c_str() + pos + 6;
941 // "?frag=header" is special.
942 if (strcmp(ptr, "header") == 0) {
943 client->stream_pos = Client::STREAM_POS_HEADER_ONLY;
944 client->stream_pos_end = -1;
947 long long frag_start = strtol(ptr, &endptr, 10);
948 if (ptr == endptr || frag_start < 0 || frag_start == LLONG_MAX) {
949 return 400; // Bad request.
951 if (*endptr != '-') {
952 return 400; // Bad request.
956 long long frag_end = strtol(ptr, &endptr, 10);
957 if (ptr == endptr || frag_end < frag_start || frag_end == LLONG_MAX) {
958 return 400; // Bad request.
961 if (*endptr != '\0') {
962 return 400; // Bad request.
965 client->stream_pos = frag_start;
966 client->stream_pos_end = frag_end;
968 url = url.substr(0, pos);
970 client->stream_pos = -1;
971 client->stream_pos_end = -1;
975 // Figure out if we're supposed to close the socket after we've delivered the response.
976 string protocol = request_tokens[2];
977 if (protocol.find("HTTP/") != 0) {
978 return 400; // Bad request.
980 client->close_after_response = false;
981 client->http_11 = true;
982 if (protocol == "HTTP/1.0") {
983 // No persistent connections.
984 client->close_after_response = true;
985 client->http_11 = false;
987 multimap<string, string>::const_iterator connection_it = headers.find("Connection");
988 if (connection_it != headers.end() && connection_it->second == "close") {
989 client->close_after_response = true;
993 map<string, int>::const_iterator stream_url_map_it = stream_url_map.find(url);
994 if (stream_url_map_it != stream_url_map.end()) {
995 // Serve a regular stream..
996 client->stream = streams[stream_url_map_it->second].get();
997 client->serving_hls_playlist = false;
999 map<string, int>::const_iterator stream_hls_url_map_it = stream_hls_url_map.find(url);
1000 if (stream_hls_url_map_it != stream_hls_url_map.end()) {
1001 // Serve HLS playlist.
1002 client->stream = streams[stream_hls_url_map_it->second].get();
1003 client->serving_hls_playlist = true;
1005 map<string, string>::const_iterator ping_url_map_it = ping_url_map.find(url);
1006 if (ping_url_map_it == ping_url_map.end()) {
1007 return 404; // Not found.
1009 // Serve a ping (204 no error).
1015 Stream *stream = client->stream;
1016 if (stream->http_header.empty()) {
1017 return 503; // Service unavailable.
1020 if (client->serving_hls_playlist) {
1021 if (stream->encoding == Stream::STREAM_ENCODING_METACUBE) {
1022 // This doesn't make any sense, and is hard to implement, too.
1029 if (client->stream_pos_end == Client::STREAM_POS_NO_END) {
1030 // This stream won't end, so we don't have a content-length,
1031 // and can just as well tell the client it's Connection: close
1032 // (otherwise, we'd have to implement chunking TE for no good reason).
1033 client->close_after_response = true;
1035 if (stream->encoding == Stream::STREAM_ENCODING_METACUBE) {
1036 // This doesn't make any sense, and is hard to implement, too.
1037 return 416; // Range not satisfiable.
1040 // Check that we have the requested fragment in our backlog.
1041 size_t buffer_end = stream->bytes_received;
1042 size_t buffer_start = (buffer_end <= stream->backlog_size) ? 0 : buffer_end - stream->backlog_size;
1044 if (client->stream_pos_end > buffer_end ||
1045 client->stream_pos < buffer_start) {
1046 return 416; // Range not satisfiable.
1050 client->stream = stream;
1051 if (setsockopt(client->sock, SOL_SOCKET, SO_MAX_PACING_RATE, &client->stream->pacing_rate, sizeof(client->stream->pacing_rate)) == -1) {
1052 if (client->stream->pacing_rate != ~0U) {
1053 log_perror("setsockopt(SO_MAX_PACING_RATE)");
1056 client->request.clear();
1061 void Server::construct_stream_header(Client *client)
1063 Stream *stream = client->stream;
1064 string response = stream->http_header;
1065 if (client->stream_pos == Client::STREAM_POS_HEADER_ONLY) {
1067 snprintf(buf, sizeof(buf), "Content-length: %zu\r\n", stream->stream_header.size());
1068 response.append(buf);
1069 } else if (client->stream_pos_end != Client::STREAM_POS_NO_END) {
1071 snprintf(buf, sizeof(buf), "Content-length: %zu\r\n", client->stream_pos_end - client->stream_pos);
1072 response.append(buf);
1074 if (client->http_11) {
1075 assert(response.find("HTTP/1.0") == 0);
1076 response[7] = '1'; // Change to HTTP/1.1.
1077 if (client->close_after_response) {
1078 response.append("Connection: close\r\n");
1081 assert(client->close_after_response);
1083 if (!stream->allow_origin.empty()) {
1084 response.append("Access-Control-Allow-Origin: ");
1085 response.append(stream->allow_origin);
1086 response.append("\r\n");
1088 if (stream->encoding == Stream::STREAM_ENCODING_RAW) {
1089 response.append("\r\n");
1090 } else if (stream->encoding == Stream::STREAM_ENCODING_METACUBE) {
1091 response.append("Content-encoding: metacube\r\n\r\n");
1092 if (!stream->stream_header.empty()) {
1093 metacube2_block_header hdr;
1094 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
1095 hdr.size = htonl(stream->stream_header.size());
1096 hdr.flags = htons(METACUBE_FLAGS_HEADER);
1097 hdr.csum = htons(metacube2_compute_crc(&hdr));
1098 response.append(string(reinterpret_cast<char *>(&hdr), sizeof(hdr)));
1103 if (client->stream_pos == Client::STREAM_POS_HEADER_ONLY) {
1104 client->state = Client::SENDING_SHORT_RESPONSE;
1105 response.append(stream->stream_header);
1107 client->state = Client::SENDING_HEADER;
1108 if (client->stream_pos_end == Client::STREAM_POS_NO_END) { // Fragments don't contain stream headers.
1109 response.append(stream->stream_header);
1113 client->header_or_short_response_holder = move(response);
1114 client->header_or_short_response = &client->header_or_short_response_holder;
1117 change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
1120 void Server::construct_error(Client *client, int error_code)
1123 if (client->http_11 && client->close_after_response) {
1124 snprintf(error, sizeof(error),
1125 "HTTP/1.1 %d Error\r\nContent-type: text/plain\r\nConnection: close\r\n\r\nSomething went wrong. Sorry.\r\n",
1128 snprintf(error, sizeof(error),
1129 "HTTP/1.%d %d Error\r\nContent-type: text/plain\r\nContent-length: 30\r\n\r\nSomething went wrong. Sorry.\r\n",
1130 client->http_11, error_code);
1132 client->header_or_short_response_holder = error;
1133 client->header_or_short_response = &client->header_or_short_response_holder;
1136 client->state = Client::SENDING_SHORT_RESPONSE;
1137 change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
1140 void Server::construct_hls_playlist(Client *client)
1142 Stream *stream = client->stream;
1143 shared_ptr<const string> *cache;
1144 if (client->http_11) {
1145 if (client->close_after_response) {
1146 cache = &stream->hls_playlist_http11_close;
1148 cache = &stream->hls_playlist_http11_persistent;
1151 assert(client->close_after_response);
1152 cache = &stream->hls_playlist_http10;
1155 if (*cache == nullptr) {
1156 *cache = stream->generate_hls_playlist(client->http_11, client->close_after_response);
1158 client->header_or_short_response_ref = *cache;
1159 client->header_or_short_response = cache->get();
1162 client->state = Client::SENDING_SHORT_RESPONSE;
1163 change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
1166 void Server::construct_204(Client *client)
1168 map<string, string>::const_iterator ping_url_map_it = ping_url_map.find(client->url);
1169 assert(ping_url_map_it != ping_url_map.end());
1172 if (client->http_11) {
1173 response = "HTTP/1.1 204 No Content\r\n";
1174 if (client->close_after_response) {
1175 response.append("Connection: close\r\n");
1178 response = "HTTP/1.0 204 No Content\r\n";
1179 assert(client->close_after_response);
1181 if (!ping_url_map_it->second.empty()) {
1182 response.append("Access-Control-Allow-Origin: ");
1183 response.append(ping_url_map_it->second);
1184 response.append("\r\n");
1186 response.append("\r\n");
1188 client->header_or_short_response_holder = move(response);
1189 client->header_or_short_response = &client->header_or_short_response_holder;
1192 client->state = Client::SENDING_SHORT_RESPONSE;
1193 change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
1197 void delete_from(vector<T> *v, T elem)
1199 typename vector<T>::iterator new_end = remove(v->begin(), v->end(), elem);
1200 v->erase(new_end, v->end());
1203 void Server::close_client(Client *client)
1205 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, nullptr) == -1) {
1206 log_perror("epoll_ctl(EPOLL_CTL_DEL)");
1210 // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
1211 if (client->stream != nullptr) {
1212 delete_from(&client->stream->sleeping_clients, client);
1213 delete_from(&client->stream->to_process, client);
1216 if (client->tls_context) {
1217 tls_destroy_context(client->tls_context);
1220 // Log to access_log.
1221 access_log->write(client->get_stats());
1224 safe_close(client->sock);
1226 clients.erase(client->sock);
1229 void Server::change_epoll_events(Client *client, uint32_t events)
1233 ev.data.ptr = client;
1235 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
1236 log_perror("epoll_ctl(EPOLL_CTL_MOD)");
1241 bool Server::more_requests(Client *client)
1243 if (client->close_after_response) {
1247 // Log to access_log.
1248 access_log->write(client->get_stats());
1250 // Switch states and reset the parsers. We don't reset statistics.
1251 client->state = Client::READING_REQUEST;
1252 client->url.clear();
1253 client->stream = NULL;
1254 client->header_or_short_response = nullptr;
1255 client->header_or_short_response_holder.clear();
1256 client->header_or_short_response_ref.reset();
1257 client->header_or_short_response_bytes_sent = 0;
1259 change_epoll_events(client, EPOLLIN | EPOLLET | EPOLLRDHUP); // No TLS handshake, so no EPOLLOUT needed.
1264 void Server::process_queued_data()
1267 lock_guard<mutex> lock(queued_clients_mutex);
1269 for (const pair<int, Acceptor *> &id_and_acceptor : queued_add_clients) {
1270 add_client(id_and_acceptor.first, id_and_acceptor.second);
1272 queued_add_clients.clear();
1275 for (unique_ptr<Stream> &stream : streams) {
1276 stream->process_queued_data();