#include <assert.h>
#include <errno.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
#include <pthread.h>
+#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <sys/epoll.h>
#include <sys/sendfile.h>
#include <sys/socket.h>
#include <utility>
#include <vector>
+#include "ktls.h"
+#include "tlse.h"
+
+#include "acceptor.h"
#include "accesslog.h"
#include "log.h"
-#include "markpool.h"
-#include "mutexlock.h"
+#include "metacube2.h"
#include "parse.h"
#include "server.h"
#include "state.pb.h"
#include "stream.h"
+#include "util.h"
+
+#ifndef SO_MAX_PACING_RATE
+#define SO_MAX_PACING_RATE 47
+#endif
using namespace std;
extern AccessLogThread *access_log;
-Server::Server()
+namespace {
+
+inline bool is_equal(timespec a, timespec b)
{
- pthread_mutex_init(&mutex, NULL);
- pthread_mutex_init(&queued_data_mutex, NULL);
+ return a.tv_sec == b.tv_sec &&
+ a.tv_nsec == b.tv_nsec;
+}
+inline bool is_earlier(timespec a, timespec b)
+{
+ if (a.tv_sec != b.tv_sec)
+ return a.tv_sec < b.tv_sec;
+ return a.tv_nsec < b.tv_nsec;
+}
+
+} // namespace
+
+Server::Server()
+{
epoll_fd = epoll_create(1024); // Size argument is ignored.
if (epoll_fd == -1) {
log_perror("epoll_fd");
Server::~Server()
{
- int ret;
- do {
- ret = close(epoll_fd);
- } while (ret == -1 && errno == EINTR);
-
- if (ret == -1) {
- log_perror("close(epoll_fd)");
- }
+ safe_close(epoll_fd);
}
vector<ClientStats> Server::get_client_stats() const
{
vector<ClientStats> ret;
- MutexLock lock(&mutex);
- for (map<int, Client>::const_iterator client_it = clients.begin();
- client_it != clients.end();
- ++client_it) {
- ret.push_back(client_it->second.get_stats());
+ lock_guard<mutex> lock(mu);
+ for (const auto &fd_and_client : clients) {
+ ret.push_back(fd_and_client.second.get_stats());
}
return ret;
}
void Server::do_work()
{
- for ( ;; ) {
- int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
- if (nfds == -1 && errno == EINTR) {
- if (should_stop) {
- return;
- }
- continue;
- }
- if (nfds == -1) {
+ while (!should_stop()) {
+ // Wait until there's activity on at least one of the fds,
+ // or 20 ms (about one frame at 50 fps) has elapsed.
+ //
+ // We could in theory wait forever and rely on wakeup()
+ // from add_client_deferred() and add_data_deferred(),
+ // but wakeup is a pretty expensive operation, and the
+ // two threads might end up fighting over a lock, so it's
+ // seemingly (much) more efficient to just have a timeout here.
+ int nfds = epoll_pwait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS, &sigset_without_usr1_block);
+ if (nfds == -1 && errno != EINTR) {
log_perror("epoll_wait");
exit(1);
}
- MutexLock lock(&mutex); // We release the mutex between iterations.
+ lock_guard<mutex> lock(mu); // We release the mutex between iterations.
process_queued_data();
+ // Process each client where we have socket activity.
for (int i = 0; i < nfds; ++i) {
- Client *client = reinterpret_cast<Client *>(events[i].data.u64);
+ Client *client = reinterpret_cast<Client *>(events[i].data.ptr);
if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
close_client(client);
process_client(client);
}
- for (map<string, Stream *>::iterator stream_it = streams.begin();
- stream_it != streams.end();
- ++stream_it) {
+ // Process each client where its stream has new data,
+ // even if there was no socket activity.
+ for (unique_ptr<Stream> &stream : streams) {
vector<Client *> to_process;
- swap(stream_it->second->to_process, to_process);
- for (size_t i = 0; i < to_process.size(); ++i) {
- process_client(to_process[i]);
+ swap(stream->to_process, to_process);
+ for (Client *client : to_process) {
+ process_client(client);
}
}
- if (should_stop) {
- return;
+ // Finally, go through each client to see if it's timed out
+ // in the READING_REQUEST state. (Seemingly there are clients
+ // that can hold sockets up for days at a time without sending
+ // anything at all.)
+ timespec timeout_time;
+ if (clock_gettime(CLOCK_MONOTONIC_COARSE, &timeout_time) == -1) {
+ log_perror("clock_gettime(CLOCK_MONOTONIC_COARSE)");
+ continue;
+ }
+ timeout_time.tv_sec -= REQUEST_READ_TIMEOUT_SEC;
+ while (!clients_ordered_by_connect_time.empty()) {
+ const pair<timespec, int> &connect_time_and_fd = clients_ordered_by_connect_time.front();
+
+ // See if we have reached the end of clients to process.
+ if (is_earlier(timeout_time, connect_time_and_fd.first)) {
+ break;
+ }
+
+ // If this client doesn't exist anymore, just ignore it
+ // (it was deleted earlier).
+ auto client_it = clients.find(connect_time_and_fd.second);
+ if (client_it == clients.end()) {
+ clients_ordered_by_connect_time.pop();
+ continue;
+ }
+ Client *client = &client_it->second;
+ if (!is_equal(client->connect_time, connect_time_and_fd.first)) {
+ // Another client has taken this fd in the meantime.
+ clients_ordered_by_connect_time.pop();
+ continue;
+ }
+
+ if (client->state != Client::READING_REQUEST) {
+ // Only READING_REQUEST can time out.
+ clients_ordered_by_connect_time.pop();
+ continue;
+ }
+
+ // OK, it timed out.
+ close_client(client);
+ clients_ordered_by_connect_time.pop();
}
}
}
-CubemapStateProto Server::serialize()
+CubemapStateProto Server::serialize(unordered_map<const string *, size_t> *short_response_pool)
{
// We don't serialize anything queued, so empty the queues.
process_queued_data();
+ // Set all clients in a consistent state before serializing
+ // (ie., they have no remaining lost data). Otherwise, increasing
+ // the backlog could take clients into a newly valid area of the backlog,
+ // sending a stream of zeros instead of skipping the data as it should.
+ //
+ // TODO: Do this when clients are added back from serialized state instead;
+ // it would probably be less wasteful.
+ for (auto &fd_and_client : clients) {
+ skip_lost_data(&fd_and_client.second);
+ }
+
CubemapStateProto serialized;
- for (map<int, Client>::const_iterator client_it = clients.begin();
- client_it != clients.end();
- ++client_it) {
- serialized.add_clients()->MergeFrom(client_it->second.serialize());
+ for (const auto &fd_and_client : clients) {
+ serialized.add_clients()->MergeFrom(fd_and_client.second.serialize(short_response_pool));
}
- for (map<string, Stream *>::const_iterator stream_it = streams.begin();
- stream_it != streams.end();
- ++stream_it) {
- serialized.add_streams()->MergeFrom(stream_it->second->serialize());
+ for (unique_ptr<Stream> &stream : streams) {
+ serialized.add_streams()->MergeFrom(stream->serialize());
}
return serialized;
}
-void Server::add_client_deferred(int sock)
+void Server::add_client_deferred(int sock, Acceptor *acceptor)
{
- MutexLock lock(&queued_data_mutex);
- queued_add_clients.push_back(sock);
+ lock_guard<mutex> lock(queued_clients_mutex);
+ queued_add_clients.push_back(std::make_pair(sock, acceptor));
}
-void Server::add_client(int sock)
+void Server::add_client(int sock, Acceptor *acceptor)
{
- clients.insert(make_pair(sock, Client(sock)));
+ const bool is_tls = acceptor->is_tls();
+ auto inserted = clients.insert(make_pair(sock, Client(sock)));
+ assert(inserted.second == true); // Should not already exist.
+ Client *client_ptr = &inserted.first->second;
+
+ start_client_timeout_timer(client_ptr);
// Start listening on data from this socket.
epoll_event ev;
- ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
- ev.data.u64 = reinterpret_cast<uint64_t>(&clients[sock]);
+ if (is_tls) {
+ // Even in the initial state (READING_REQUEST), TLS needs to
+ // send data for the handshake, and thus might end up needing
+ // to know about EPOLLOUT.
+ ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLRDHUP;
+ } else {
+ // EPOLLOUT will be added once we go out of READING_REQUEST.
+ ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
+ }
+ ev.data.ptr = client_ptr;
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
log_perror("epoll_ctl(EPOLL_CTL_ADD)");
exit(1);
}
- process_client(&clients[sock]);
+ if (is_tls) {
+ assert(tls_server_contexts.count(acceptor));
+ client_ptr->tls_context = tls_accept(tls_server_contexts[acceptor]);
+ if (client_ptr->tls_context == nullptr) {
+ log(ERROR, "tls_accept() failed");
+ close_client(client_ptr);
+ return;
+ }
+ tls_make_exportable(client_ptr->tls_context, 1);
+ }
+
+ process_client(client_ptr);
}
-void Server::add_client_from_serialized(const ClientProto &client)
+void Server::add_client_from_serialized(const ClientProto &client, const vector<shared_ptr<const string>> &short_responses)
{
- MutexLock lock(&mutex);
+ lock_guard<mutex> lock(mu);
Stream *stream;
- map<string, Stream *>::iterator stream_it = streams.find(client.stream_id());
- if (stream_it == streams.end()) {
- stream = NULL;
+ int stream_index = lookup_stream_by_url(client.url());
+ if (stream_index == -1) {
+ assert(client.state() != Client::SENDING_DATA);
+ stream = nullptr;
} else {
- stream = stream_it->second;
+ stream = streams[stream_index].get();
}
- clients.insert(make_pair(client.sock(), Client(client, stream)));
- Client *client_ptr = &clients[client.sock()];
+ auto inserted = clients.insert(make_pair(client.sock(), Client(client, short_responses, stream)));
+ assert(inserted.second == true); // Should not already exist.
+ Client *client_ptr = &inserted.first->second;
+
+ // Connection timestamps must be nondecreasing.
+ assert(clients_ordered_by_connect_time.empty() ||
+ !is_earlier(client_ptr->connect_time, clients_ordered_by_connect_time.back().first));
+ clients_ordered_by_connect_time.push(make_pair(client_ptr->connect_time, client.sock()));
// Start listening on data from this socket.
epoll_event ev;
if (client.state() == Client::READING_REQUEST) {
- ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
+ // See the corresponding comment in Server::add_client().
+ if (client.has_tls_context()) {
+ ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLRDHUP;
+ } else {
+ ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
+ }
} else {
// If we don't have more data for this client, we'll be putting it into
// the sleeping array again soon.
ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
}
- ev.data.u64 = 0; // Keep Valgrind happy.
- ev.data.u64 = reinterpret_cast<uint64_t>(client_ptr);
+ ev.data.ptr = client_ptr;
if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client.sock(), &ev) == -1) {
log_perror("epoll_ctl(EPOLL_CTL_ADD)");
exit(1);
}
- if (client_ptr->state == Client::SENDING_DATA &&
- client_ptr->stream_pos == client_ptr->stream->bytes_received) {
+ if (client_ptr->state == Client::WAITING_FOR_KEYFRAME ||
+ client_ptr->state == Client::PREBUFFERING ||
+ (client_ptr->state == Client::SENDING_DATA &&
+ client_ptr->stream_pos == client_ptr->stream->bytes_received)) {
client_ptr->stream->put_client_to_sleep(client_ptr);
} else {
process_client(client_ptr);
}
}
-void Server::add_stream(const string &stream_id, size_t backlog_size)
+void Server::start_client_timeout_timer(Client *client)
{
- MutexLock lock(&mutex);
- streams.insert(make_pair(stream_id, new Stream(stream_id, backlog_size)));
+ // Connection timestamps must be nondecreasing. I can't find any guarantee
+ // that even the monotonic clock can't go backwards by a small amount
+ // (think switching between CPUs with non-synchronized TSCs), so if
+ // this actually should happen, we hack around it by fudging
+ // connect_time.
+ if (clock_gettime(CLOCK_MONOTONIC_COARSE, &client->connect_time) == -1) {
+ log_perror("clock_gettime(CLOCK_MONOTONIC_COARSE)");
+ } else {
+ if (!clients_ordered_by_connect_time.empty() &&
+ is_earlier(client->connect_time, clients_ordered_by_connect_time.back().first)) {
+ client->connect_time = clients_ordered_by_connect_time.back().first;
+ }
+ clients_ordered_by_connect_time.push(make_pair(client->connect_time, client->sock));
+ }
+}
+
+int Server::lookup_stream_by_url(const string &url) const
+{
+ const auto stream_url_it = stream_url_map.find(url);
+ if (stream_url_it == stream_url_map.end()) {
+ return -1;
+ }
+ return stream_url_it->second;
}
-void Server::add_stream_from_serialized(const StreamProto &stream)
+int Server::add_stream(const string &url,
+ const string &hls_url,
+ size_t backlog_size,
+ size_t prebuffering_bytes,
+ Stream::Encoding encoding,
+ Stream::Encoding src_encoding,
+ unsigned hls_frag_duration,
+ size_t hls_backlog_margin,
+ const string &allow_origin)
{
- MutexLock lock(&mutex);
- streams.insert(make_pair(stream.stream_id(), new Stream(stream)));
+ lock_guard<mutex> lock(mu);
+ stream_url_map.insert(make_pair(url, streams.size()));
+ if (!hls_url.empty()) {
+ stream_hls_url_map.insert(make_pair(hls_url, streams.size()));
+ }
+ streams.emplace_back(new Stream(url, backlog_size, prebuffering_bytes, encoding, src_encoding, hls_frag_duration, hls_backlog_margin, allow_origin));
+ return streams.size() - 1;
+}
+
+int Server::add_stream_from_serialized(const StreamProto &stream, int data_fd)
+{
+ lock_guard<mutex> lock(mu);
+ stream_url_map.insert(make_pair(stream.url(), streams.size()));
+ // stream_hls_url_map will be updated in register_hls_url(), since it is not part
+ // of the serialized state (it will always be picked out from the configuration).
+ streams.emplace_back(new Stream(stream, data_fd));
+ return streams.size() - 1;
}
-void Server::set_backlog_size(const std::string &stream_id, size_t new_size)
+void Server::set_backlog_size(int stream_index, size_t new_size)
{
- MutexLock lock(&mutex);
- assert(streams.count(stream_id) != 0);
- streams[stream_id]->set_backlog_size(new_size);
+ lock_guard<mutex> lock(mu);
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ streams[stream_index]->set_backlog_size(new_size);
+}
+
+void Server::set_prebuffering_bytes(int stream_index, size_t new_amount)
+{
+ lock_guard<mutex> lock(mu);
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ streams[stream_index]->prebuffering_bytes = new_amount;
}
-void Server::set_header(const string &stream_id, const string &header)
+void Server::set_encoding(int stream_index, Stream::Encoding encoding)
+{
+ lock_guard<mutex> lock(mu);
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ streams[stream_index]->encoding = encoding;
+}
+
+void Server::set_src_encoding(int stream_index, Stream::Encoding encoding)
+{
+ lock_guard<mutex> lock(mu);
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ streams[stream_index]->src_encoding = encoding;
+}
+
+void Server::set_hls_frag_duration(int stream_index, unsigned hls_frag_duration)
+{
+ lock_guard<mutex> lock(mu);
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ streams[stream_index]->hls_frag_duration = hls_frag_duration;
+}
+
+void Server::set_hls_backlog_margin(int stream_index, size_t hls_backlog_margin)
{
- MutexLock lock(&mutex);
- find_stream(stream_id)->header = header;
+ lock_guard<mutex> lock(mu);
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ assert(hls_backlog_margin >= 0);
+ assert(hls_backlog_margin < streams[stream_index]->backlog_size);
+ streams[stream_index]->hls_backlog_margin = hls_backlog_margin;
+}
+
+void Server::set_allow_origin(int stream_index, const string &allow_origin)
+{
+ lock_guard<mutex> lock(mu);
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ streams[stream_index]->allow_origin = allow_origin;
+}
- // If there are clients we haven't sent anything to yet, we should give
- // them the header, so push back into the SENDING_HEADER state.
- for (map<int, Client>::iterator client_it = clients.begin();
- client_it != clients.end();
- ++client_it) {
- Client *client = &client_it->second;
- if (client->state == Client::SENDING_DATA &&
- client->stream_pos == 0) {
- construct_header(client);
+void Server::register_hls_url(int stream_index, const string &hls_url)
+{
+ lock_guard<mutex> lock(mu);
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ assert(!hls_url.empty());
+ stream_hls_url_map.insert(make_pair(hls_url, stream_index));
+}
+
+void Server::set_header(int stream_index, const string &http_header, const string &stream_header)
+{
+ lock_guard<mutex> lock(mu);
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ Stream *stream = streams[stream_index].get();
+ stream->http_header = http_header;
+
+ if (stream_header != stream->stream_header) {
+ // We cannot start at any of the older starting points anymore,
+ // since they'd get the wrong header for the stream (not to mention
+ // that a changed header probably means the stream restarted,
+ // which means any client starting on the old one would probably
+ // stop playing properly at the change point). Next block
+ // should be a suitable starting point (if not, something is
+ // pretty strange), so it will fill up again soon enough.
+ stream->suitable_starting_points.clear();
+
+ if (!stream->fragments.empty()) {
+ stream->fragments.clear();
+ ++stream->discontinuity_counter;
+ stream->clear_hls_playlist_cache();
}
}
+ stream->stream_header = stream_header;
}
-void Server::set_mark_pool(const std::string &stream_id, MarkPool *mark_pool)
+void Server::set_pacing_rate(int stream_index, uint32_t pacing_rate)
{
- MutexLock lock(&mutex);
+ lock_guard<mutex> lock(mu);
assert(clients.empty());
- find_stream(stream_id)->mark_pool = mark_pool;
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ streams[stream_index]->pacing_rate = pacing_rate;
}
-void Server::add_data_deferred(const string &stream_id, const char *data, size_t bytes)
+void Server::add_gen204(const std::string &url, const std::string &allow_origin)
{
- MutexLock lock(&queued_data_mutex);
- queued_data[stream_id].append(string(data, data + bytes));
+ lock_guard<mutex> lock(mu);
+ assert(clients.empty());
+ ping_url_map[url] = allow_origin;
+}
+
+void Server::create_tls_context_for_acceptor(const Acceptor *acceptor)
+{
+ assert(acceptor->is_tls());
+
+ bool is_server = true;
+ TLSContext *server_context = tls_create_context(is_server, TLS_V12);
+
+ const string &cert = acceptor->get_certificate_chain();
+ int num_cert = tls_load_certificates(server_context, reinterpret_cast<const unsigned char *>(cert.data()), cert.size());
+ assert(num_cert > 0); // Should have been checked by config earlier.
+
+ const string &key = acceptor->get_private_key();
+ int num_key = tls_load_private_key(server_context, reinterpret_cast<const unsigned char *>(key.data()), key.size());
+ assert(num_key > 0); // Should have been checked by config earlier.
+
+ tls_server_contexts.insert(make_pair(acceptor, server_context));
+}
+
+void Server::add_data_deferred(int stream_index, const char *data, size_t bytes, uint16_t metacube_flags, const RationalPTS &pts)
+{
+ assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
+ streams[stream_index]->add_data_deferred(data, bytes, metacube_flags, pts);
}
// See the .h file for postconditions after this function.
{
switch (client->state) {
case Client::READING_REQUEST: {
+ if (client->tls_context != nullptr) {
+ if (send_pending_tls_data(client)) {
+ // send_pending_tls_data() hit postconditions #1 or #4.
+ return;
+ }
+ }
+
read_request_again:
// Try to read more of the request.
char buf[1024];
int ret;
- do {
- ret = read(client->sock, buf, sizeof(buf));
- } while (ret == -1 && errno == EINTR);
-
- if (ret == -1 && errno == EAGAIN) {
- // No more data right now. Nothing to do.
- // This is postcondition #2.
- return;
- }
- if (ret == -1) {
- log_perror("read");
- close_client(client);
- return;
- }
- if (ret == 0) {
- // OK, the socket is closed.
- close_client(client);
- return;
+ if (client->tls_context == nullptr) {
+ ret = read_nontls_data(client, buf, sizeof(buf));
+ if (ret == -1) {
+ // read_nontls_data() hit postconditions #1 or #2.
+ return;
+ }
+ } else {
+ ret = read_tls_data(client, buf, sizeof(buf));
+ if (ret == -1) {
+ // read_tls_data() hit postconditions #1, #2 or #4.
+ return;
+ }
}
RequestParseStatus status = wait_for_double_newline(&client->request, buf, ret);
assert(status == RP_FINISHED);
+ if (client->tls_context && !client->in_ktls_mode && tls_established(client->tls_context)) {
+ // We're ready to enter kTLS mode, unless we still have some
+ // handshake data to send (which then must be sent as non-kTLS).
+ if (send_pending_tls_data(client)) {
+ // send_pending_tls_data() hit postconditions #1 or #4.
+ return;
+ }
+ ret = tls_make_ktls(client->tls_context, client->sock);
+ if (ret < 0) {
+ log_tls_error("tls_make_ktls", ret);
+ close_client(client);
+ return;
+ }
+ client->in_ktls_mode = true;
+ }
+
int error_code = parse_request(client);
if (error_code == 200) {
- construct_header(client);
+ if (client->serving_hls_playlist) {
+ construct_hls_playlist(client);
+ } else {
+ construct_stream_header(client);
+ }
+ } else if (error_code == 204) {
+ construct_204(client);
} else {
construct_error(client, error_code);
}
// We've changed states, so fall through.
- assert(client->state == Client::SENDING_ERROR ||
+ assert(client->state == Client::SENDING_SHORT_RESPONSE ||
client->state == Client::SENDING_HEADER);
}
- case Client::SENDING_ERROR:
+ case Client::SENDING_SHORT_RESPONSE:
case Client::SENDING_HEADER: {
-sending_header_or_error_again:
+sending_header_or_short_response_again:
int ret;
do {
ret = write(client->sock,
- client->header_or_error.data() + client->header_or_error_bytes_sent,
- client->header_or_error.size() - client->header_or_error_bytes_sent);
+ client->header_or_short_response->data() + client->header_or_short_response_bytes_sent,
+ client->header_or_short_response->size() - client->header_or_short_response_bytes_sent);
} while (ret == -1 && errno == EINTR);
if (ret == -1 && errno == EAGAIN) {
return;
}
- client->header_or_error_bytes_sent += ret;
- assert(client->header_or_error_bytes_sent <= client->header_or_error.size());
+ client->header_or_short_response_bytes_sent += ret;
+ assert(client->header_or_short_response_bytes_sent <= client->header_or_short_response->size());
- if (client->header_or_error_bytes_sent < client->header_or_error.size()) {
+ if (client->header_or_short_response_bytes_sent < client->header_or_short_response->size()) {
// We haven't sent all yet. Fine; go another round.
- goto sending_header_or_error_again;
+ goto sending_header_or_short_response_again;
}
// We're done sending the header or error! Clear it to release some memory.
- client->header_or_error.clear();
-
- if (client->state == Client::SENDING_ERROR) {
- // We're done sending the error, so now close.
- // This is postcondition #1.
- close_client(client);
+ client->header_or_short_response = nullptr;
+ client->header_or_short_response_holder.clear();
+ client->header_or_short_response_ref.reset();
+
+ if (client->state == Client::SENDING_SHORT_RESPONSE) {
+ if (more_requests(client)) {
+ // We're done sending the error, but should keep on reading new requests.
+ goto read_request_again;
+ } else {
+ // We're done sending the error, so now close.
+ // This is postcondition #1.
+ close_client(client);
+ }
return;
}
- // Start sending from the end. In other words, we won't send any of the backlog,
- // but we'll start sending immediately as we get data.
- // This is postcondition #3.
+ Stream *stream = client->stream;
+ if (client->stream_pos == Client::STREAM_POS_AT_START) {
+ // Start sending from the beginning of the backlog.
+ client->stream_pos = min<size_t>(
+ stream->bytes_received - stream->backlog_size,
+ 0);
+ client->state = Client::SENDING_DATA;
+ goto sending_data;
+ } else if (client->stream_pos_end != Client::STREAM_POS_NO_END) {
+ // We're sending a fragment, and should have all of it,
+ // so start sending right away.
+ assert(client->stream_pos >= 0);
+ client->state = Client::SENDING_DATA;
+ goto sending_data;
+ } else if (stream->prebuffering_bytes == 0) {
+ // Start sending from the first keyframe we get. In other
+ // words, we won't send any of the backlog, but we'll start
+ // sending immediately as we get the next keyframe block.
+ // Note that this is functionally identical to the next if branch,
+ // except that we save a binary search.
+ assert(client->stream_pos == Client::STREAM_POS_AT_END);
+ assert(client->stream_pos_end == Client::STREAM_POS_NO_END);
+ client->stream_pos = stream->bytes_received;
+ client->state = Client::WAITING_FOR_KEYFRAME;
+ } else {
+ // We're not going to send anything to the client before we have
+ // N bytes. However, this wait might be boring; we can just as well
+ // use it to send older data if we have it. We use lower_bound()
+ // so that we are conservative and never add extra latency over just
+ // waiting (assuming CBR or nearly so); otherwise, we could want e.g.
+ // 100 kB prebuffer but end up sending a 10 MB GOP.
+ assert(client->stream_pos == Client::STREAM_POS_AT_END);
+ assert(client->stream_pos_end == Client::STREAM_POS_NO_END);
+ deque<size_t>::const_iterator starting_point_it =
+ lower_bound(stream->suitable_starting_points.begin(),
+ stream->suitable_starting_points.end(),
+ stream->bytes_received - stream->prebuffering_bytes);
+ if (starting_point_it == stream->suitable_starting_points.end()) {
+ // None found. Just put us at the end, and then wait for the
+ // first keyframe to appear.
+ client->stream_pos = stream->bytes_received;
+ client->state = Client::WAITING_FOR_KEYFRAME;
+ } else {
+ client->stream_pos = *starting_point_it;
+ client->state = Client::PREBUFFERING;
+ goto prebuffering;
+ }
+ }
+ // Fall through.
+ }
+ case Client::WAITING_FOR_KEYFRAME: {
+ Stream *stream = client->stream;
+ if (stream->suitable_starting_points.empty() ||
+ client->stream_pos > stream->suitable_starting_points.back()) {
+ // We haven't received a keyframe since this stream started waiting,
+ // so keep on waiting for one.
+ // This is postcondition #3.
+ stream->put_client_to_sleep(client);
+ return;
+ }
+ client->stream_pos = stream->suitable_starting_points.back();
+ client->state = Client::PREBUFFERING;
+ // Fall through.
+ }
+ case Client::PREBUFFERING: {
+prebuffering:
+ Stream *stream = client->stream;
+ size_t bytes_to_send = stream->bytes_received - client->stream_pos;
+ assert(bytes_to_send <= stream->backlog_size);
+ if (bytes_to_send < stream->prebuffering_bytes) {
+ // We don't have enough bytes buffered to start this client yet.
+ // This is postcondition #3.
+ stream->put_client_to_sleep(client);
+ return;
+ }
client->state = Client::SENDING_DATA;
- client->stream_pos = client->stream->bytes_received;
- client->stream->put_client_to_sleep(client);
- return;
+ // Fall through.
}
case Client::SENDING_DATA: {
-sending_data_again:
- // See if there's some data we've lost. Ideally, we should drop to a block boundary,
- // but resync will be the mux's problem.
+sending_data:
+ skip_lost_data(client);
Stream *stream = client->stream;
- size_t bytes_to_send = stream->bytes_received - client->stream_pos;
+
+sending_data_again:
+ size_t bytes_to_send;
+ if (client->stream_pos_end == Client::STREAM_POS_NO_END) {
+ bytes_to_send = stream->bytes_received - client->stream_pos;
+ } else {
+ bytes_to_send = client->stream_pos_end - client->stream_pos;
+ }
+ assert(bytes_to_send <= stream->backlog_size);
if (bytes_to_send == 0) {
+ if (client->stream_pos == client->stream_pos_end) { // We have a definite end, and we're at it.
+ if (more_requests(client)) {
+ // We're done sending the fragment, but should keep on reading new requests.
+ goto read_request_again;
+ } else {
+ // We're done sending the fragment, so now close.
+ // This is postcondition #1.
+ close_client(client);
+ }
+ }
return;
}
- if (bytes_to_send > stream->backlog_size) {
- log(WARNING, "[%s] Client lost %lld bytes, maybe too slow connection",
- client->remote_addr.c_str(),
- (long long int)(bytes_to_send - stream->backlog_size));
- client->stream_pos = stream->bytes_received - stream->backlog_size;
- client->bytes_lost += bytes_to_send - stream->backlog_size;
- ++client->num_loss_events;
- bytes_to_send = stream->backlog_size;
- }
// See if we need to split across the circular buffer.
bool more_data = false;
ssize_t ret;
do {
- loff_t offset = client->stream_pos % stream->backlog_size;
+ off_t offset = client->stream_pos % stream->backlog_size;
ret = sendfile(client->sock, stream->data_fd, &offset, bytes_to_send);
} while (ret == -1 && errno == EINTR);
client->stream_pos += ret;
client->bytes_sent += ret;
- if (client->stream_pos == stream->bytes_received) {
+ assert(client->stream_pos_end == Client::STREAM_POS_NO_END || client->stream_pos <= client->stream_pos_end);
+ if (client->stream_pos == client->stream_pos_end) {
+ goto sending_data_again; // Will see that bytes_to_send == 0 and end.
+ } else if (client->stream_pos == stream->bytes_received) {
// We don't have any more data for this client, so put it to sleep.
// This is postcondition #3.
stream->put_client_to_sleep(client);
} else if (more_data && size_t(ret) == bytes_to_send) {
goto sending_data_again;
}
+ // We'll also get here for postcondition #4 (similar to the EAGAIN path above).
break;
}
default:
}
}
+namespace {
+
+void flush_pending_data(int sock)
+{
+ // Flush pending data, which would otherwise wait for the 200ms TCP_CORK timer
+ // to elapsed; does not cancel out TCP_CORK (since that still takes priority),
+ // but does a one-off flush.
+ int one = 1;
+ if (setsockopt(sock, SOL_TCP, TCP_NODELAY, &one, sizeof(one)) == -1) {
+ log_perror("setsockopt(TCP_NODELAY)");
+ // Can still continue.
+ }
+}
+
+} // namespace
+
+bool Server::send_pending_tls_data(Client *client)
+{
+ // See if there's data from the TLS library to write.
+ if (client->tls_data_to_send == nullptr) {
+ client->tls_data_to_send = tls_get_write_buffer(client->tls_context, &client->tls_data_left_to_send);
+ if (client->tls_data_to_send == nullptr) {
+ // Really no data to send.
+ return false;
+ }
+ }
+
+send_data_again:
+ int ret;
+ do {
+ ret = write(client->sock, client->tls_data_to_send, client->tls_data_left_to_send);
+ } while (ret == -1 && errno == EINTR);
+ assert(ret < 0 || size_t(ret) <= client->tls_data_left_to_send);
+
+ if (ret == -1 && errno == EAGAIN) {
+ // We're out of socket space, so now we're at the “low edge” of epoll's
+ // edge triggering. epoll will tell us when there is more room, so for now,
+ // just return.
+ // This is postcondition #4.
+ return true;
+ }
+ if (ret == -1) {
+ // Error! Postcondition #1.
+ log_perror("write");
+ close_client(client);
+ return true;
+ }
+ if (ret > 0 && size_t(ret) == client->tls_data_left_to_send) {
+ // All data has been sent, so we don't need to go to sleep
+ // (although we are likely to do so immediately afterwards,
+ // due to lack of client data).
+ tls_buffer_clear(client->tls_context);
+ client->tls_data_to_send = nullptr;
+
+ // Flush the data we just wrote, since the client probably
+ // is waiting for it.
+ flush_pending_data(client->sock);
+ return false;
+ }
+
+ // More data to send, so try again.
+ client->tls_data_to_send += ret;
+ client->tls_data_left_to_send -= ret;
+ goto send_data_again;
+}
+
+int Server::read_nontls_data(Client *client, char *buf, size_t max_size)
+{
+ int ret;
+ do {
+ ret = read(client->sock, buf, max_size);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1 && errno == EAGAIN) {
+ // No more data right now. Nothing to do.
+ // This is postcondition #2.
+ return -1;
+ }
+ if (ret == -1) {
+ log_perror("read");
+ close_client(client);
+ return -1;
+ }
+ if (ret == 0) {
+ // OK, the socket is closed.
+ close_client(client);
+ return -1;
+ }
+
+ return ret;
+}
+
+int Server::read_tls_data(Client *client, char *buf, size_t max_size)
+{
+read_again:
+ int ret;
+ do {
+ ret = read(client->sock, buf, max_size);
+ } while (ret == -1 && errno == EINTR);
+
+ if (ret == -1 && errno == EAGAIN) {
+ // No more data right now. Nothing to do.
+ // This is postcondition #2.
+ return -1;
+ }
+ if (ret == -1) {
+ log_perror("read");
+ close_client(client);
+ return -1;
+ }
+ if (ret == 0) {
+ // OK, the socket is closed.
+ close_client(client);
+ return -1;
+ }
+
+ // Give it to the TLS library.
+ int err = tls_consume_stream(client->tls_context, reinterpret_cast<const unsigned char *>(buf), ret, nullptr);
+ if (err < 0) {
+ log_tls_error("tls_consume_stream", err);
+ close_client(client);
+ return -1;
+ }
+ if (err == 0) {
+ // Not consumed any data. See if we can read more.
+ goto read_again;
+ }
+
+ // Read any decrypted data available for us. (We can reuse buf, since it's free now.)
+ ret = tls_read(client->tls_context, reinterpret_cast<unsigned char *>(buf), max_size);
+ if (ret == 0) {
+ // No decrypted data for us yet, but there might be some more handshaking
+ // to send. Do that if needed, then look for more data.
+ if (send_pending_tls_data(client)) {
+ // send_pending_tls_data() hit postconditions #1 or #4.
+ return -1;
+ }
+ goto read_again;
+ }
+ if (ret < 0) {
+ log_tls_error("tls_read", ret);
+ close_client(client);
+ return -1;
+ }
+
+ assert(ret > 0);
+ return ret;
+}
+
+// See if there's some data we've lost. Ideally, we should drop to a block boundary,
+// but resync will be the mux's problem.
+void Server::skip_lost_data(Client *client)
+{
+ Stream *stream = client->stream;
+ if (stream == nullptr) {
+ return;
+ }
+ size_t bytes_to_send = stream->bytes_received - client->stream_pos;
+ if (bytes_to_send > stream->backlog_size) {
+ size_t bytes_lost = bytes_to_send - stream->backlog_size;
+ client->bytes_lost += bytes_lost;
+ ++client->num_loss_events;
+ if (!client->close_after_response) {
+ assert(client->stream_pos_end != Client::STREAM_POS_NO_END);
+
+ // We've already sent a Content-Length, so we can't just skip data.
+ // Close the connection immediately and hope the other side
+ // is able to figure out that there was an error and it needs to skip.
+ client->close_after_response = true;
+ client->stream_pos = client->stream_pos_end;
+ } else {
+ client->stream_pos = stream->bytes_received - stream->backlog_size;
+ }
+ }
+}
+
int Server::parse_request(Client *client)
{
vector<string> lines = split_lines(client->request);
+ client->request.clear();
if (lines.empty()) {
return 400; // Bad request (empty).
}
+ // Parse the headers, for logging purposes.
+ HTTPHeaderMultimap headers = extract_headers(lines, client->remote_addr);
+ const auto referer_it = headers.find("Referer");
+ if (referer_it != headers.end()) {
+ client->referer = referer_it->second;
+ }
+ const auto user_agent_it = headers.find("User-Agent");
+ if (user_agent_it != headers.end()) {
+ client->user_agent = user_agent_it->second;
+ }
+
vector<string> request_tokens = split_tokens(lines[0]);
- if (request_tokens.size() < 2) {
+ if (request_tokens.size() < 3) {
return 400; // Bad request (empty).
}
if (request_tokens[0] != "GET") {
return 400; // Should maybe be 405 instead?
}
- if (streams.count(request_tokens[1]) == 0) {
- return 404; // Not found.
+
+ string url = request_tokens[1];
+ client->url = url;
+ if (url.size() > 8 && url.find("?backlog") == url.size() - 8) {
+ client->stream_pos = Client::STREAM_POS_AT_START;
+ url = url.substr(0, url.size() - 8);
+ } else {
+ size_t pos = url.find("?frag=");
+ if (pos != string::npos) {
+ // Parse an endpoint of the type /stream.mp4?frag=1234-5678.
+ const char *ptr = url.c_str() + pos + 6;
+
+ // "?frag=header" is special.
+ if (strcmp(ptr, "header") == 0) {
+ client->stream_pos = Client::STREAM_POS_HEADER_ONLY;
+ client->stream_pos_end = -1;
+ } else {
+ char *endptr;
+ long long frag_start = strtol(ptr, &endptr, 10);
+ if (ptr == endptr || frag_start < 0 || frag_start == LLONG_MAX) {
+ return 400; // Bad request.
+ }
+ if (*endptr != '-') {
+ return 400; // Bad request.
+ }
+ ptr = endptr + 1;
+
+ long long frag_end = strtol(ptr, &endptr, 10);
+ if (ptr == endptr || frag_end < frag_start || frag_end == LLONG_MAX) {
+ return 400; // Bad request.
+ }
+
+ if (*endptr != '\0') {
+ return 400; // Bad request.
+ }
+
+ client->stream_pos = frag_start;
+ client->stream_pos_end = frag_end;
+ }
+ url = url.substr(0, pos);
+ } else {
+ client->stream_pos = -1;
+ client->stream_pos_end = -1;
+ }
}
- client->stream_id = request_tokens[1];
- client->stream = find_stream(client->stream_id);
- if (client->stream->mark_pool != NULL) {
- client->fwmark = client->stream->mark_pool->get_mark();
+ // Figure out if we're supposed to close the socket after we've delivered the response.
+ string protocol = request_tokens[2];
+ if (protocol.find("HTTP/") != 0) {
+ return 400; // Bad request.
+ }
+ client->close_after_response = false;
+ client->http_11 = true;
+ if (protocol == "HTTP/1.0") {
+ // No persistent connections.
+ client->close_after_response = true;
+ client->http_11 = false;
} else {
- client->fwmark = 0; // No mark.
+ const auto connection_it = headers.find("Connection");
+ if (connection_it != headers.end() && connection_it->second == "close") {
+ client->close_after_response = true;
+ }
}
- if (setsockopt(client->sock, SOL_SOCKET, SO_MARK, &client->fwmark, sizeof(client->fwmark)) == -1) {
- if (client->fwmark != 0) {
- log_perror("setsockopt(SO_MARK)");
+
+ const auto stream_url_map_it = stream_url_map.find(url);
+ if (stream_url_map_it != stream_url_map.end()) {
+ // Serve a regular stream..
+ client->stream = streams[stream_url_map_it->second].get();
+ client->serving_hls_playlist = false;
+ } else {
+ const auto stream_hls_url_map_it = stream_hls_url_map.find(url);
+ if (stream_hls_url_map_it != stream_hls_url_map.end()) {
+ // Serve HLS playlist.
+ client->stream = streams[stream_hls_url_map_it->second].get();
+ client->serving_hls_playlist = true;
+ } else {
+ const auto ping_url_map_it = ping_url_map.find(url);
+ if (ping_url_map_it == ping_url_map.end()) {
+ return 404; // Not found.
+ } else {
+ // Serve a ping (204 no error).
+ return 204;
+ }
+ }
+ }
+
+ Stream *stream = client->stream;
+ if (stream->http_header.empty()) {
+ return 503; // Service unavailable.
+ }
+
+ if (client->serving_hls_playlist) {
+ if (stream->encoding == Stream::STREAM_ENCODING_METACUBE) {
+ // This doesn't make any sense, and is hard to implement, too.
+ return 404;
+ } else {
+ return 200;
+ }
+ }
+
+ if (client->stream_pos_end == Client::STREAM_POS_NO_END) {
+ // This stream won't end, so we don't have a content-length,
+ // and can just as well tell the client it's Connection: close
+ // (otherwise, we'd have to implement chunking TE for no good reason).
+ client->close_after_response = true;
+ } else {
+ if (stream->encoding == Stream::STREAM_ENCODING_METACUBE) {
+ // This doesn't make any sense, and is hard to implement, too.
+ return 416; // Range not satisfiable.
+ }
+
+ // Check that we have the requested fragment in our backlog.
+ size_t buffer_end = stream->bytes_received;
+ size_t buffer_start = (buffer_end <= stream->backlog_size) ? 0 : buffer_end - stream->backlog_size;
+
+ if (client->stream_pos_end > buffer_end ||
+ client->stream_pos < buffer_start) {
+ return 416; // Range not satisfiable.
+ }
+ }
+
+ client->stream = stream;
+ if (setsockopt(client->sock, SOL_SOCKET, SO_MAX_PACING_RATE, &client->stream->pacing_rate, sizeof(client->stream->pacing_rate)) == -1) {
+ if (client->stream->pacing_rate != ~0U) {
+ log_perror("setsockopt(SO_MAX_PACING_RATE)");
}
}
client->request.clear();
return 200; // OK!
}
-void Server::construct_header(Client *client)
+void Server::construct_stream_header(Client *client)
{
- client->header_or_error = find_stream(client->stream_id)->header;
-
- // Switch states.
- client->state = Client::SENDING_HEADER;
+ Stream *stream = client->stream;
+ string response = stream->http_header;
+ if (client->stream_pos == Client::STREAM_POS_HEADER_ONLY) {
+ char buf[64];
+ snprintf(buf, sizeof(buf), "Content-Length: %zu\r\n", stream->stream_header.size());
+ response.append(buf);
+ } else if (client->stream_pos_end != Client::STREAM_POS_NO_END) {
+ char buf[64];
+ snprintf(buf, sizeof(buf), "Content-Length: %" PRIu64 "\r\n", client->stream_pos_end - client->stream_pos);
+ response.append(buf);
+ }
+ if (client->http_11) {
+ assert(response.find("HTTP/1.0") == 0);
+ response[7] = '1'; // Change to HTTP/1.1.
+ if (client->close_after_response) {
+ response.append("Connection: close\r\n");
+ }
+ } else {
+ assert(client->close_after_response);
+ }
+ if (!stream->allow_origin.empty()) {
+ response.append("Access-Control-Allow-Origin: ");
+ response.append(stream->allow_origin);
+ response.append("\r\n");
+ }
+ if (stream->encoding == Stream::STREAM_ENCODING_RAW) {
+ response.append("\r\n");
+ } else if (stream->encoding == Stream::STREAM_ENCODING_METACUBE) {
+ response.append("Content-Encoding: metacube\r\n\r\n");
+ if (!stream->stream_header.empty()) {
+ metacube2_block_header hdr;
+ memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
+ hdr.size = htonl(stream->stream_header.size());
+ hdr.flags = htons(METACUBE_FLAGS_HEADER);
+ hdr.csum = htons(metacube2_compute_crc(&hdr));
+ response.append(string(reinterpret_cast<char *>(&hdr), sizeof(hdr)));
+ }
+ } else {
+ assert(false);
+ }
+ if (client->stream_pos == Client::STREAM_POS_HEADER_ONLY) {
+ client->state = Client::SENDING_SHORT_RESPONSE;
+ response.append(stream->stream_header);
+ } else {
+ client->state = Client::SENDING_HEADER;
+ if (client->stream_pos_end == Client::STREAM_POS_NO_END) { // Fragments don't contain stream headers.
+ response.append(stream->stream_header);
+ }
+ }
- epoll_event ev;
- ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
- ev.data.u64 = reinterpret_cast<uint64_t>(client);
+ client->header_or_short_response_holder = move(response);
+ client->header_or_short_response = &client->header_or_short_response_holder;
- if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
- log_perror("epoll_ctl(EPOLL_CTL_MOD)");
- exit(1);
- }
+ // Switch states.
+ change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
}
void Server::construct_error(Client *client, int error_code)
{
char error[256];
- snprintf(error, 256, "HTTP/1.0 %d Error\r\nContent-type: text/plain\r\n\r\nSomething went wrong. Sorry.\r\n",
- error_code);
- client->header_or_error = error;
+ if (client->http_11 && client->close_after_response) {
+ snprintf(error, sizeof(error),
+ "HTTP/1.1 %d Error\r\nContent-Type: text/plain\r\nConnection: close\r\n\r\nSomething went wrong. Sorry.\r\n",
+ error_code);
+ } else {
+ snprintf(error, sizeof(error),
+ "HTTP/1.%d %d Error\r\nContent-Type: text/plain\r\nContent-Length: 30\r\n\r\nSomething went wrong. Sorry.\r\n",
+ client->http_11, error_code);
+ }
+ client->header_or_short_response_holder = error;
+ client->header_or_short_response = &client->header_or_short_response_holder;
// Switch states.
- client->state = Client::SENDING_ERROR;
+ client->state = Client::SENDING_SHORT_RESPONSE;
+ change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
+}
- epoll_event ev;
- ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
- ev.data.u64 = reinterpret_cast<uint64_t>(client);
+void Server::construct_hls_playlist(Client *client)
+{
+ Stream *stream = client->stream;
+ shared_ptr<const string> *cache;
+ if (client->http_11) {
+ if (client->close_after_response) {
+ cache = &stream->hls_playlist_http11_close;
+ } else {
+ cache = &stream->hls_playlist_http11_persistent;
+ }
+ } else {
+ assert(client->close_after_response);
+ cache = &stream->hls_playlist_http10;
+ }
- if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
- log_perror("epoll_ctl(EPOLL_CTL_MOD)");
- exit(1);
+ if (*cache == nullptr) {
+ *cache = stream->generate_hls_playlist(client->http_11, client->close_after_response);
}
+ client->header_or_short_response_ref = *cache;
+ client->header_or_short_response = cache->get();
+
+ // Switch states.
+ client->state = Client::SENDING_SHORT_RESPONSE;
+ change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
}
+void Server::construct_204(Client *client)
+{
+ const auto ping_url_map_it = ping_url_map.find(client->url);
+ assert(ping_url_map_it != ping_url_map.end());
+
+ string response;
+ if (client->http_11) {
+ response = "HTTP/1.1 204 No Content\r\n";
+ if (client->close_after_response) {
+ response.append("Connection: close\r\n");
+ }
+ } else {
+ response = "HTTP/1.0 204 No Content\r\n";
+ assert(client->close_after_response);
+ }
+ if (!ping_url_map_it->second.empty()) {
+ response.append("Access-Control-Allow-Origin: ");
+ response.append(ping_url_map_it->second);
+ response.append("\r\n");
+ }
+ response.append("\r\n");
+
+ client->header_or_short_response_holder = move(response);
+ client->header_or_short_response = &client->header_or_short_response_holder;
+
+ // Switch states.
+ client->state = Client::SENDING_SHORT_RESPONSE;
+ change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
+}
+
+namespace {
+
template<class T>
void delete_from(vector<T> *v, T elem)
{
typename vector<T>::iterator new_end = remove(v->begin(), v->end(), elem);
v->erase(new_end, v->end());
}
+
+void send_ktls_close(int sock)
+{
+ uint8_t record_type = 21; // Alert.
+ uint8_t body[] = {
+ 1, // Warning level (but still fatal!).
+ 0, // close_notify.
+ };
+
+ int cmsg_len = sizeof(record_type);
+ char buf[CMSG_SPACE(cmsg_len)];
+
+ msghdr msg = {0};
+ msg.msg_control = buf;
+ msg.msg_controllen = sizeof(buf);
+ cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
+ cmsg->cmsg_level = SOL_TLS;
+ cmsg->cmsg_type = TLS_SET_RECORD_TYPE;
+ cmsg->cmsg_len = CMSG_LEN(cmsg_len);
+ *CMSG_DATA(cmsg) = record_type;
+ msg.msg_controllen = cmsg->cmsg_len;
+
+ iovec msg_iov;
+ msg_iov.iov_base = body;
+ msg_iov.iov_len = sizeof(body);
+ msg.msg_iov = &msg_iov;
+ msg.msg_iovlen = 1;
+
+ int err;
+ do {
+ err = sendmsg(sock, &msg, 0);
+ } while (err == -1 && errno == EINTR); // Ignore all other errors.
+}
+
+} // namespace
void Server::close_client(Client *client)
{
- if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, nullptr) == -1) {
log_perror("epoll_ctl(EPOLL_CTL_DEL)");
exit(1);
}
// This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
- if (client->stream != NULL) {
+ if (client->stream != nullptr) {
delete_from(&client->stream->sleeping_clients, client);
delete_from(&client->stream->to_process, client);
- if (client->stream->mark_pool != NULL) {
- int fwmark = client->fwmark;
- client->stream->mark_pool->release_mark(fwmark);
+ }
+
+ if (client->tls_context) {
+ if (client->in_ktls_mode) {
+ // Keep GnuTLS happy.
+ send_ktls_close(client->sock);
}
+ tls_destroy_context(client->tls_context);
}
// Log to access_log.
access_log->write(client->get_stats());
// Bye-bye!
- int ret;
- do {
- ret = close(client->sock);
- } while (ret == -1 && errno == EINTR);
-
- if (ret == -1) {
- log_perror("close");
- }
+ safe_close(client->sock);
clients.erase(client->sock);
}
-
-Stream *Server::find_stream(const string &stream_id)
+
+void Server::change_epoll_events(Client *client, uint32_t events)
+{
+ epoll_event ev;
+ ev.events = events;
+ ev.data.ptr = client;
+
+ if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
+ log_perror("epoll_ctl(EPOLL_CTL_MOD)");
+ exit(1);
+ }
+}
+
+bool Server::more_requests(Client *client)
{
- map<string, Stream *>::iterator it = streams.find(stream_id);
- assert(it != streams.end());
- return it->second;
+ if (client->close_after_response) {
+ return false;
+ }
+
+ // Log to access_log.
+ access_log->write(client->get_stats());
+
+ flush_pending_data(client->sock);
+
+ // Switch states and reset the parsers. We don't reset statistics.
+ client->state = Client::READING_REQUEST;
+ client->url.clear();
+ client->stream = NULL;
+ client->header_or_short_response = nullptr;
+ client->header_or_short_response_holder.clear();
+ client->header_or_short_response_ref.reset();
+ client->header_or_short_response_bytes_sent = 0;
+ client->bytes_sent = 0;
+ start_client_timeout_timer(client);
+
+ change_epoll_events(client, EPOLLIN | EPOLLET | EPOLLRDHUP); // No TLS handshake, so no EPOLLOUT needed.
+
+ return true;
}
void Server::process_queued_data()
{
- MutexLock lock(&queued_data_mutex);
+ {
+ lock_guard<mutex> lock(queued_clients_mutex);
- for (size_t i = 0; i < queued_add_clients.size(); ++i) {
- add_client(queued_add_clients[i]);
+ for (const pair<int, Acceptor *> &id_and_acceptor : queued_add_clients) {
+ add_client(id_and_acceptor.first, id_and_acceptor.second);
+ }
+ queued_add_clients.clear();
+ }
+
+ for (unique_ptr<Stream> &stream : streams) {
+ stream->process_queued_data();
}
- queued_add_clients.clear();
-
- for (map<string, string>::iterator queued_it = queued_data.begin();
- queued_it != queued_data.end();
- ++queued_it) {
- Stream *stream = find_stream(queued_it->first);
- stream->add_data(queued_it->second.data(), queued_it->second.size());
- stream->wake_up_all_clients();
- }
- queued_data.clear();
}
projects / cubemap / blobdiff