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nghttp2/src/shrpx_http2_session.cc

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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "shrpx_http2_session.h"
#include <netinet/tcp.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif // HAVE_UNISTD_H
#include <vector>
#include <openssl/err.h>
#include "shrpx_upstream.h"
#include "shrpx_downstream.h"
#include "shrpx_config.h"
#include "shrpx_error.h"
#include "shrpx_http2_downstream_connection.h"
#include "shrpx_client_handler.h"
#include "shrpx_tls.h"
#include "shrpx_http.h"
#include "shrpx_worker.h"
#include "shrpx_connect_blocker.h"
#include "shrpx_log.h"
#include "http2.h"
#include "util.h"
#include "base64.h"
#include "tls.h"
using namespace nghttp2;
namespace shrpx {
namespace {
constexpr ev_tstamp CONNCHK_TIMEOUT = 5.;
constexpr ev_tstamp CONNCHK_PING_TIMEOUT = 1.;
} // namespace
namespace {
constexpr size_t MAX_BUFFER_SIZE = 32_k;
} // namespace
namespace {
void connchk_timeout_cb(struct ev_loop *loop, ev_timer *w, int revents) {
auto http2session = static_cast<Http2Session *>(w->data);
ev_timer_stop(loop, w);
switch (http2session->get_connection_check_state()) {
case ConnectionCheck::STARTED:
// ping timeout; disconnect
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "ping timeout";
}
delete http2session;
return;
default:
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "connection check required";
}
http2session->set_connection_check_state(ConnectionCheck::REQUIRED);
}
}
} // namespace
namespace {
void settings_timeout_cb(struct ev_loop *loop, ev_timer *w, int revents) {
auto http2session = static_cast<Http2Session *>(w->data);
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "SETTINGS timeout";
}
downstream_failure(http2session->get_addr(), http2session->get_raddr());
if (http2session->terminate_session(NGHTTP2_SETTINGS_TIMEOUT) != 0) {
delete http2session;
return;
}
http2session->signal_write();
}
} // namespace
namespace {
void timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto http2session = static_cast<Http2Session *>(conn->data);
if (w == &conn->rt && !conn->expired_rt()) {
return;
}
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "Timeout";
}
http2session->on_timeout();
delete http2session;
}
} // namespace
namespace {
void readcb(struct ev_loop *loop, ev_io *w, int revents) {
int rv;
auto conn = static_cast<Connection *>(w->data);
auto http2session = static_cast<Http2Session *>(conn->data);
rv = http2session->do_read();
if (rv != 0) {
delete http2session;
return;
}
http2session->connection_alive();
}
} // namespace
namespace {
void writecb(struct ev_loop *loop, ev_io *w, int revents) {
int rv;
auto conn = static_cast<Connection *>(w->data);
auto http2session = static_cast<Http2Session *>(conn->data);
rv = http2session->do_write();
if (rv != 0) {
delete http2session;
return;
}
http2session->reset_connection_check_timer_if_not_checking();
}
} // namespace
namespace {
void initiate_connection_cb(struct ev_loop *loop, ev_timer *w, int revents) {
auto http2session = static_cast<Http2Session *>(w->data);
ev_timer_stop(loop, w);
if (http2session->initiate_connection() != 0) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "Could not initiate backend connection";
}
delete http2session;
return;
}
}
} // namespace
namespace {
void prepare_cb(struct ev_loop *loop, ev_prepare *w, int revents) {
auto http2session = static_cast<Http2Session *>(w->data);
http2session->check_retire();
}
} // namespace
Http2Session::Http2Session(struct ev_loop *loop, SSL_CTX *ssl_ctx,
Worker *worker,
const std::shared_ptr<DownstreamAddrGroup> &group,
DownstreamAddr *addr)
: dlnext(nullptr),
dlprev(nullptr),
conn_(loop, -1, nullptr, worker->get_mcpool(),
group->shared_addr->timeout.write, group->shared_addr->timeout.read,
{}, {}, writecb, readcb, timeoutcb, this,
get_config()->tls.dyn_rec.warmup_threshold,
get_config()->tls.dyn_rec.idle_timeout, Proto::HTTP2),
wb_(worker->get_mcpool()),
worker_(worker),
ssl_ctx_(ssl_ctx),
group_(group),
addr_(addr),
session_(nullptr),
raddr_(nullptr),
state_(Http2SessionState::DISCONNECTED),
connection_check_state_(ConnectionCheck::NONE),
freelist_zone_(FreelistZone::NONE),
settings_recved_(false),
allow_connect_proto_(false) {
read_ = write_ = &Http2Session::noop;
on_read_ = &Http2Session::read_noop;
on_write_ = &Http2Session::write_noop;
// We will reuse this many times, so use repeat timeout value. The
// timeout value is set later.
ev_timer_init(&connchk_timer_, connchk_timeout_cb, 0., 0.);
connchk_timer_.data = this;
// SETTINGS ACK timeout is 10 seconds for now. We will reuse this
// many times, so use repeat timeout value.
ev_timer_init(&settings_timer_, settings_timeout_cb, 0., 0.);
settings_timer_.data = this;
ev_timer_init(&initiate_connection_timer_, initiate_connection_cb, 0., 0.);
initiate_connection_timer_.data = this;
ev_prepare_init(&prep_, prepare_cb);
prep_.data = this;
ev_prepare_start(loop, &prep_);
}
Http2Session::~Http2Session() {
exclude_from_scheduling();
disconnect(should_hard_fail());
}
int Http2Session::disconnect(bool hard) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Disconnecting";
}
nghttp2_session_del(session_);
session_ = nullptr;
wb_.reset();
if (dns_query_) {
auto dns_tracker = worker_->get_dns_tracker();
dns_tracker->cancel(dns_query_.get());
}
conn_.rlimit.stopw();
conn_.wlimit.stopw();
ev_prepare_stop(conn_.loop, &prep_);
ev_timer_stop(conn_.loop, &initiate_connection_timer_);
ev_timer_stop(conn_.loop, &settings_timer_);
ev_timer_stop(conn_.loop, &connchk_timer_);
read_ = write_ = &Http2Session::noop;
on_read_ = &Http2Session::read_noop;
on_write_ = &Http2Session::write_noop;
conn_.disconnect();
if (proxy_htp_) {
proxy_htp_.reset();
}
connection_check_state_ = ConnectionCheck::NONE;
state_ = Http2SessionState::DISCONNECTED;
// When deleting Http2DownstreamConnection, it calls this object's
// remove_downstream_connection(). The multiple
// Http2DownstreamConnection objects belong to the same
// ClientHandler object if upstream is h2. So be careful when you
// delete ClientHandler here.
//
// We allow creating new pending Http2DownstreamConnection with this
// object. Upstream::on_downstream_reset() may add
// Http2DownstreamConnection to another Http2Session.
for (auto dc = dconns_.head; dc;) {
auto next = dc->dlnext;
auto downstream = dc->get_downstream();
auto upstream = downstream->get_upstream();
// Failure is allowed only for HTTP/1 upstream where upstream is
// not shared by multiple Downstreams.
if (upstream->on_downstream_reset(downstream, hard) != 0) {
delete upstream->get_client_handler();
}
// dc was deleted
dc = next;
}
auto streams = std::move(streams_);
for (auto s = streams.head; s;) {
auto next = s->dlnext;
delete s;
s = next;
}
return 0;
}
int Http2Session::resolve_name() {
auto dns_query = std::make_unique<DNSQuery>(
addr_->host, [this](DNSResolverStatus status, const Address *result) {
int rv;
if (status == DNSResolverStatus::OK) {
*resolved_addr_ = *result;
util::set_port(*this->resolved_addr_, this->addr_->port);
}
rv = this->initiate_connection();
if (rv != 0) {
delete this;
}
});
resolved_addr_ = std::make_unique<Address>();
auto dns_tracker = worker_->get_dns_tracker();
switch (dns_tracker->resolve(resolved_addr_.get(), dns_query.get())) {
case DNSResolverStatus::ERROR:
return -1;
case DNSResolverStatus::RUNNING:
dns_query_ = std::move(dns_query);
state_ = Http2SessionState::RESOLVING_NAME;
return 0;
case DNSResolverStatus::OK:
util::set_port(*resolved_addr_, addr_->port);
return 0;
default:
assert(0);
abort();
}
}
namespace {
int htp_hdrs_completecb(llhttp_t *htp);
} // namespace
namespace {
constexpr llhttp_settings_t htp_hooks = {
nullptr, // llhttp_cb on_message_begin;
nullptr, // llhttp_data_cb on_url;
nullptr, // llhttp_data_cb on_status;
nullptr, // llhttp_data_cb on_header_field;
nullptr, // llhttp_data_cb on_header_value;
htp_hdrs_completecb, // llhttp_cb on_headers_complete;
nullptr, // llhttp_data_cb on_body;
nullptr, // llhttp_cb on_message_complete;
nullptr, // llhttp_cb on_chunk_header
nullptr, // llhttp_cb on_chunk_complete
};
} // namespace
int Http2Session::initiate_connection() {
int rv = 0;
auto worker_blocker = worker_->get_connect_blocker();
if (state_ == Http2SessionState::DISCONNECTED ||
state_ == Http2SessionState::RESOLVING_NAME) {
if (worker_blocker->blocked()) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this)
<< "Worker wide backend connection was blocked temporarily";
}
return -1;
}
}
auto &downstreamconf = *get_config()->conn.downstream;
const auto &proxy = get_config()->downstream_http_proxy;
if (!proxy.host.empty() && state_ == Http2SessionState::DISCONNECTED) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Connecting to the proxy " << proxy.host << ":"
<< proxy.port;
}
conn_.fd = util::create_nonblock_socket(proxy.addr.su.storage.ss_family);
if (conn_.fd == -1) {
auto error = errno;
SSLOG(WARN, this) << "Backend proxy socket() failed; addr="
<< util::to_numeric_addr(&proxy.addr)
<< ", errno=" << error;
worker_blocker->on_failure();
return -1;
}
rv = connect(conn_.fd, &proxy.addr.su.sa, proxy.addr.len);
if (rv != 0 && errno != EINPROGRESS) {
auto error = errno;
SSLOG(WARN, this) << "Backend proxy connect() failed; addr="
<< util::to_numeric_addr(&proxy.addr)
<< ", errno=" << error;
worker_blocker->on_failure();
return -1;
}
raddr_ = &proxy.addr;
worker_blocker->on_success();
ev_io_set(&conn_.rev, conn_.fd, EV_READ);
ev_io_set(&conn_.wev, conn_.fd, EV_WRITE);
conn_.wlimit.startw();
conn_.wt.repeat = downstreamconf.timeout.connect;
ev_timer_again(conn_.loop, &conn_.wt);
write_ = &Http2Session::connected;
on_read_ = &Http2Session::downstream_read_proxy;
on_write_ = &Http2Session::downstream_connect_proxy;
proxy_htp_ = std::make_unique<llhttp_t>();
llhttp_init(proxy_htp_.get(), HTTP_RESPONSE, &htp_hooks);
proxy_htp_->data = this;
state_ = Http2SessionState::PROXY_CONNECTING;
return 0;
}
if (state_ == Http2SessionState::DISCONNECTED ||
state_ == Http2SessionState::PROXY_CONNECTED ||
state_ == Http2SessionState::RESOLVING_NAME) {
if (LOG_ENABLED(INFO)) {
if (state_ != Http2SessionState::RESOLVING_NAME) {
SSLOG(INFO, this) << "Connecting to downstream server";
}
}
if (addr_->tls) {
assert(ssl_ctx_);
if (state_ != Http2SessionState::RESOLVING_NAME) {
auto ssl = tls::create_ssl(ssl_ctx_);
if (!ssl) {
return -1;
}
tls::setup_downstream_http2_alpn(ssl);
conn_.set_ssl(ssl);
conn_.tls.client_session_cache = &addr_->tls_session_cache;
auto sni_name =
addr_->sni.empty() ? StringRef{addr_->host} : StringRef{addr_->sni};
if (!util::numeric_host(sni_name.c_str())) {
// TLS extensions: SNI. There is no documentation about the return
// code for this function (actually this is macro wrapping SSL_ctrl
// at the time of this writing).
SSL_set_tlsext_host_name(conn_.tls.ssl, sni_name.c_str());
}
auto tls_session = tls::reuse_tls_session(addr_->tls_session_cache);
if (tls_session) {
SSL_set_session(conn_.tls.ssl, tls_session);
SSL_SESSION_free(tls_session);
}
}
if (state_ == Http2SessionState::DISCONNECTED) {
if (addr_->dns) {
rv = resolve_name();
if (rv != 0) {
downstream_failure(addr_, nullptr);
return -1;
}
if (state_ == Http2SessionState::RESOLVING_NAME) {
return 0;
}
raddr_ = resolved_addr_.get();
} else {
raddr_ = &addr_->addr;
}
}
if (state_ == Http2SessionState::RESOLVING_NAME) {
if (dns_query_->status == DNSResolverStatus::ERROR) {
downstream_failure(addr_, nullptr);
return -1;
}
assert(dns_query_->status == DNSResolverStatus::OK);
state_ = Http2SessionState::DISCONNECTED;
dns_query_.reset();
raddr_ = resolved_addr_.get();
}
// If state_ == Http2SessionState::PROXY_CONNECTED, we have
// connected to the proxy using conn_.fd and tunnel has been
// established.
if (state_ == Http2SessionState::DISCONNECTED) {
assert(conn_.fd == -1);
conn_.fd = util::create_nonblock_socket(raddr_->su.storage.ss_family);
if (conn_.fd == -1) {
auto error = errno;
SSLOG(WARN, this)
<< "socket() failed; addr=" << util::to_numeric_addr(raddr_)
<< ", errno=" << error;
worker_blocker->on_failure();
return -1;
}
worker_blocker->on_success();
rv = connect(conn_.fd,
// TODO maybe not thread-safe?
const_cast<sockaddr *>(&raddr_->su.sa), raddr_->len);
if (rv != 0 && errno != EINPROGRESS) {
auto error = errno;
SSLOG(WARN, this)
<< "connect() failed; addr=" << util::to_numeric_addr(raddr_)
<< ", errno=" << error;
downstream_failure(addr_, raddr_);
return -1;
}
ev_io_set(&conn_.rev, conn_.fd, EV_READ);
ev_io_set(&conn_.wev, conn_.fd, EV_WRITE);
}
conn_.prepare_client_handshake();
} else {
if (state_ == Http2SessionState::DISCONNECTED) {
// Without TLS and proxy.
if (addr_->dns) {
rv = resolve_name();
if (rv != 0) {
downstream_failure(addr_, nullptr);
return -1;
}
if (state_ == Http2SessionState::RESOLVING_NAME) {
return 0;
}
raddr_ = resolved_addr_.get();
} else {
raddr_ = &addr_->addr;
}
}
if (state_ == Http2SessionState::RESOLVING_NAME) {
if (dns_query_->status == DNSResolverStatus::ERROR) {
downstream_failure(addr_, nullptr);
return -1;
}
assert(dns_query_->status == DNSResolverStatus::OK);
state_ = Http2SessionState::DISCONNECTED;
dns_query_.reset();
raddr_ = resolved_addr_.get();
}
if (state_ == Http2SessionState::DISCONNECTED) {
// Without TLS and proxy.
assert(conn_.fd == -1);
conn_.fd = util::create_nonblock_socket(raddr_->su.storage.ss_family);
if (conn_.fd == -1) {
auto error = errno;
SSLOG(WARN, this)
<< "socket() failed; addr=" << util::to_numeric_addr(raddr_)
<< ", errno=" << error;
worker_blocker->on_failure();
return -1;
}
worker_blocker->on_success();
rv = connect(conn_.fd, const_cast<sockaddr *>(&raddr_->su.sa),
raddr_->len);
if (rv != 0 && errno != EINPROGRESS) {
auto error = errno;
SSLOG(WARN, this)
<< "connect() failed; addr=" << util::to_numeric_addr(raddr_)
<< ", errno=" << error;
downstream_failure(addr_, raddr_);
return -1;
}
ev_io_set(&conn_.rev, conn_.fd, EV_READ);
ev_io_set(&conn_.wev, conn_.fd, EV_WRITE);
}
}
// We have been already connected when no TLS and proxy is used.
if (state_ == Http2SessionState::PROXY_CONNECTED) {
on_read_ = &Http2Session::read_noop;
on_write_ = &Http2Session::write_noop;
return connected();
}
write_ = &Http2Session::connected;
state_ = Http2SessionState::CONNECTING;
conn_.wlimit.startw();
conn_.wt.repeat = downstreamconf.timeout.connect;
ev_timer_again(conn_.loop, &conn_.wt);
return 0;
}
// Unreachable
assert(0);
return 0;
}
namespace {
int htp_hdrs_completecb(llhttp_t *htp) {
auto http2session = static_cast<Http2Session *>(htp->data);
// We only read HTTP header part. If tunneling succeeds, response
// body is a different protocol (HTTP/2 in this case), we don't read
// them here.
// We just check status code here
if (htp->status_code / 100 == 2) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "Tunneling success";
}
http2session->set_state(Http2SessionState::PROXY_CONNECTED);
return HPE_PAUSED;
}
SSLOG(WARN, http2session) << "Tunneling failed: " << htp->status_code;
http2session->set_state(Http2SessionState::PROXY_FAILED);
return HPE_PAUSED;
}
} // namespace
int Http2Session::downstream_read_proxy(const uint8_t *data, size_t datalen) {
auto htperr = llhttp_execute(proxy_htp_.get(),
reinterpret_cast<const char *>(data), datalen);
if (htperr == HPE_PAUSED) {
switch (state_) {
case Http2SessionState::PROXY_CONNECTED:
// Initiate SSL/TLS handshake through established tunnel.
if (initiate_connection() != 0) {
return -1;
}
return 0;
case Http2SessionState::PROXY_FAILED:
return -1;
default:
break;
}
// should not be here
assert(0);
}
if (htperr != HPE_OK) {
return -1;
}
return 0;
}
int Http2Session::downstream_connect_proxy() {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Connected to the proxy";
}
std::string req = "CONNECT ";
req.append(addr_->hostport.c_str(), addr_->hostport.size());
if (addr_->port == 80 || addr_->port == 443) {
req += ':';
req += util::utos(addr_->port);
}
req += " HTTP/1.1\r\nHost: ";
req += addr_->host;
req += "\r\n";
const auto &proxy = get_config()->downstream_http_proxy;
if (!proxy.userinfo.empty()) {
req += "Proxy-Authorization: Basic ";
req += base64::encode(std::begin(proxy.userinfo), std::end(proxy.userinfo));
req += "\r\n";
}
req += "\r\n";
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "HTTP proxy request headers\n" << req;
}
wb_.append(req);
on_write_ = &Http2Session::write_noop;
signal_write();
return 0;
}
void Http2Session::add_downstream_connection(Http2DownstreamConnection *dconn) {
dconns_.append(dconn);
++addr_->num_dconn;
}
void Http2Session::remove_downstream_connection(
Http2DownstreamConnection *dconn) {
--addr_->num_dconn;
dconns_.remove(dconn);
dconn->detach_stream_data();
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Remove downstream";
}
if (freelist_zone_ == FreelistZone::NONE && !max_concurrency_reached()) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Append to http2_extra_freelist, addr=" << addr_
<< ", freelist.size="
<< addr_->http2_extra_freelist.size();
}
add_to_extra_freelist();
}
}
void Http2Session::remove_stream_data(StreamData *sd) {
streams_.remove(sd);
if (sd->dconn) {
sd->dconn->detach_stream_data();
}
delete sd;
}
int Http2Session::submit_request(Http2DownstreamConnection *dconn,
const nghttp2_nv *nva, size_t nvlen,
const nghttp2_data_provider *data_prd) {
assert(state_ == Http2SessionState::CONNECTED);
auto sd = std::make_unique<StreamData>();
sd->dlnext = sd->dlprev = nullptr;
// TODO Specify nullptr to pri_spec for now
auto stream_id =
nghttp2_submit_request(session_, nullptr, nva, nvlen, data_prd, sd.get());
if (stream_id < 0) {
SSLOG(FATAL, this) << "nghttp2_submit_request() failed: "
<< nghttp2_strerror(stream_id);
return -1;
}
dconn->attach_stream_data(sd.get());
dconn->get_downstream()->set_downstream_stream_id(stream_id);
streams_.append(sd.release());
return 0;
}
int Http2Session::submit_rst_stream(int32_t stream_id, uint32_t error_code) {
assert(state_ == Http2SessionState::CONNECTED);
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "RST_STREAM stream_id=" << stream_id
<< " with error_code=" << error_code;
}
int rv = nghttp2_submit_rst_stream(session_, NGHTTP2_FLAG_NONE, stream_id,
error_code);
if (rv != 0) {
SSLOG(FATAL, this) << "nghttp2_submit_rst_stream() failed: "
<< nghttp2_strerror(rv);
return -1;
}
return 0;
}
nghttp2_session *Http2Session::get_session() const { return session_; }
int Http2Session::resume_data(Http2DownstreamConnection *dconn) {
assert(state_ == Http2SessionState::CONNECTED);
auto downstream = dconn->get_downstream();
int rv = nghttp2_session_resume_data(session_,
downstream->get_downstream_stream_id());
switch (rv) {
case 0:
case NGHTTP2_ERR_INVALID_ARGUMENT:
return 0;
default:
SSLOG(FATAL, this) << "nghttp2_resume_session() failed: "
<< nghttp2_strerror(rv);
return -1;
}
}
namespace {
void call_downstream_readcb(Http2Session *http2session,
Downstream *downstream) {
auto upstream = downstream->get_upstream();
if (!upstream) {
return;
}
if (upstream->downstream_read(downstream->get_downstream_connection()) != 0) {
delete upstream->get_client_handler();
}
}
} // namespace
namespace {
int on_stream_close_callback(nghttp2_session *session, int32_t stream_id,
uint32_t error_code, void *user_data) {
auto http2session = static_cast<Http2Session *>(user_data);
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session)
<< "Stream stream_id=" << stream_id
<< " is being closed with error code " << error_code;
}
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, stream_id));
if (sd == 0) {
// We might get this close callback when pushed streams are
// closed.
return 0;
}
auto dconn = sd->dconn;
if (dconn) {
auto downstream = dconn->get_downstream();
auto upstream = downstream->get_upstream();
if (downstream->get_downstream_stream_id() % 2 == 0 &&
downstream->get_request_state() == DownstreamState::INITIAL) {
// Downstream is canceled in backend before it is submitted in
// frontend session.
// This will avoid to send RST_STREAM to backend
downstream->set_response_state(DownstreamState::MSG_RESET);
upstream->cancel_premature_downstream(downstream);
} else {
if (downstream->get_upgraded() && downstream->get_response_state() ==
DownstreamState::HEADER_COMPLETE) {
// For tunneled connection, we have to submit RST_STREAM to
// upstream *after* whole response body is sent. We just set
// MSG_COMPLETE here. Upstream will take care of that.
downstream->get_upstream()->on_downstream_body_complete(downstream);
downstream->set_response_state(DownstreamState::MSG_COMPLETE);
} else if (error_code == NGHTTP2_NO_ERROR) {
switch (downstream->get_response_state()) {
case DownstreamState::MSG_COMPLETE:
case DownstreamState::MSG_BAD_HEADER:
break;
default:
downstream->set_response_state(DownstreamState::MSG_RESET);
}
} else if (downstream->get_response_state() !=
DownstreamState::MSG_BAD_HEADER) {
downstream->set_response_state(DownstreamState::MSG_RESET);
}
if (downstream->get_response_state() == DownstreamState::MSG_RESET &&
downstream->get_response_rst_stream_error_code() ==
NGHTTP2_NO_ERROR) {
downstream->set_response_rst_stream_error_code(error_code);
}
call_downstream_readcb(http2session, downstream);
}
// dconn may be deleted
}
// The life time of StreamData ends here
http2session->remove_stream_data(sd);
return 0;
}
} // namespace
void Http2Session::start_settings_timer() {
auto &downstreamconf = get_config()->http2.downstream;
ev_timer_set(&settings_timer_, downstreamconf.timeout.settings, 0.);
ev_timer_start(conn_.loop, &settings_timer_);
}
void Http2Session::stop_settings_timer() {
ev_timer_stop(conn_.loop, &settings_timer_);
}
namespace {
int on_header_callback2(nghttp2_session *session, const nghttp2_frame *frame,
nghttp2_rcbuf *name, nghttp2_rcbuf *value,
uint8_t flags, void *user_data) {
auto http2session = static_cast<Http2Session *>(user_data);
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!sd || !sd->dconn) {
return 0;
}
auto downstream = sd->dconn->get_downstream();
auto namebuf = nghttp2_rcbuf_get_buf(name);
auto valuebuf = nghttp2_rcbuf_get_buf(value);
auto &resp = downstream->response();
auto &httpconf = get_config()->http;
switch (frame->hd.type) {
case NGHTTP2_HEADERS: {
auto trailer = frame->headers.cat == NGHTTP2_HCAT_HEADERS &&
!downstream->get_expect_final_response();
if (resp.fs.buffer_size() + namebuf.len + valuebuf.len >
httpconf.response_header_field_buffer ||
resp.fs.num_fields() >= httpconf.max_response_header_fields) {
if (LOG_ENABLED(INFO)) {
DLOG(INFO, downstream)
<< "Too large or many header field size="
<< resp.fs.buffer_size() + namebuf.len + valuebuf.len
<< ", num=" << resp.fs.num_fields() + 1;
}
if (trailer) {
// We don't care trailer part exceeds header size limit; just
// discard it.
return 0;
}
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
auto token = http2::lookup_token(namebuf.base, namebuf.len);
auto no_index = flags & NGHTTP2_NV_FLAG_NO_INDEX;
downstream->add_rcbuf(name);
downstream->add_rcbuf(value);
if (trailer) {
// just store header fields for trailer part
resp.fs.add_trailer_token(StringRef{namebuf.base, namebuf.len},
StringRef{valuebuf.base, valuebuf.len},
no_index, token);
return 0;
}
resp.fs.add_header_token(StringRef{namebuf.base, namebuf.len},
StringRef{valuebuf.base, valuebuf.len}, no_index,
token);
return 0;
}
case NGHTTP2_PUSH_PROMISE: {
auto promised_stream_id = frame->push_promise.promised_stream_id;
auto promised_sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, promised_stream_id));
if (!promised_sd || !promised_sd->dconn) {
http2session->submit_rst_stream(promised_stream_id, NGHTTP2_CANCEL);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
auto promised_downstream = promised_sd->dconn->get_downstream();
auto namebuf = nghttp2_rcbuf_get_buf(name);
auto valuebuf = nghttp2_rcbuf_get_buf(value);
assert(promised_downstream);
auto &promised_req = promised_downstream->request();
// We use request header limit for PUSH_PROMISE
if (promised_req.fs.buffer_size() + namebuf.len + valuebuf.len >
httpconf.request_header_field_buffer ||
promised_req.fs.num_fields() >= httpconf.max_request_header_fields) {
if (LOG_ENABLED(INFO)) {
DLOG(INFO, downstream)
<< "Too large or many header field size="
<< promised_req.fs.buffer_size() + namebuf.len + valuebuf.len
<< ", num=" << promised_req.fs.num_fields() + 1;
}
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
promised_downstream->add_rcbuf(name);
promised_downstream->add_rcbuf(value);
auto token = http2::lookup_token(namebuf.base, namebuf.len);
promised_req.fs.add_header_token(StringRef{namebuf.base, namebuf.len},
StringRef{valuebuf.base, valuebuf.len},
flags & NGHTTP2_NV_FLAG_NO_INDEX, token);
return 0;
}
}
return 0;
}
} // namespace
namespace {
int on_invalid_header_callback2(nghttp2_session *session,
const nghttp2_frame *frame, nghttp2_rcbuf *name,
nghttp2_rcbuf *value, uint8_t flags,
void *user_data) {
auto http2session = static_cast<Http2Session *>(user_data);
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!sd || !sd->dconn) {
return 0;
}
int32_t stream_id;
if (frame->hd.type == NGHTTP2_PUSH_PROMISE) {
stream_id = frame->push_promise.promised_stream_id;
} else {
stream_id = frame->hd.stream_id;
}
if (LOG_ENABLED(INFO)) {
auto namebuf = nghttp2_rcbuf_get_buf(name);
auto valuebuf = nghttp2_rcbuf_get_buf(value);
SSLOG(INFO, http2session)
<< "Invalid header field for stream_id=" << stream_id
<< " in frame type=" << static_cast<uint32_t>(frame->hd.type)
<< ": name=[" << StringRef{namebuf.base, namebuf.len} << "], value=["
<< StringRef{valuebuf.base, valuebuf.len} << "]";
}
http2session->submit_rst_stream(stream_id, NGHTTP2_PROTOCOL_ERROR);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
} // namespace
namespace {
int on_begin_headers_callback(nghttp2_session *session,
const nghttp2_frame *frame, void *user_data) {
auto http2session = static_cast<Http2Session *>(user_data);
switch (frame->hd.type) {
case NGHTTP2_HEADERS: {
if (frame->headers.cat != NGHTTP2_HCAT_RESPONSE &&
frame->headers.cat != NGHTTP2_HCAT_PUSH_RESPONSE) {
return 0;
}
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!sd || !sd->dconn) {
http2session->submit_rst_stream(frame->hd.stream_id,
NGHTTP2_INTERNAL_ERROR);
return 0;
}
return 0;
}
case NGHTTP2_PUSH_PROMISE: {
auto promised_stream_id = frame->push_promise.promised_stream_id;
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!sd || !sd->dconn) {
http2session->submit_rst_stream(promised_stream_id, NGHTTP2_CANCEL);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
auto downstream = sd->dconn->get_downstream();
assert(downstream);
assert(downstream->get_downstream_stream_id() == frame->hd.stream_id);
if (http2session->handle_downstream_push_promise(downstream,
promised_stream_id) != 0) {
http2session->submit_rst_stream(promised_stream_id, NGHTTP2_CANCEL);
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
return 0;
}
}
return 0;
}
} // namespace
namespace {
int on_response_headers(Http2Session *http2session, Downstream *downstream,
nghttp2_session *session, const nghttp2_frame *frame) {
int rv;
auto upstream = downstream->get_upstream();
auto handler = upstream->get_client_handler();
const auto &req = downstream->request();
auto &resp = downstream->response();
auto &nva = resp.fs.headers();
auto config = get_config();
auto &loggingconf = config->logging;
downstream->set_expect_final_response(false);
auto status = resp.fs.header(http2::HD__STATUS);
// libnghttp2 guarantees this exists and can be parsed
assert(status);
auto status_code = http2::parse_http_status_code(status->value);
resp.http_status = status_code;
resp.http_major = 2;
resp.http_minor = 0;
downstream->set_downstream_addr_group(
http2session->get_downstream_addr_group());
downstream->set_addr(http2session->get_addr());
if (LOG_ENABLED(INFO)) {
std::stringstream ss;
for (auto &nv : nva) {
ss << TTY_HTTP_HD << nv.name << TTY_RST << ": " << nv.value << "\n";
}
SSLOG(INFO, http2session)
<< "HTTP response headers. stream_id=" << frame->hd.stream_id << "\n"
<< ss.str();
}
if (downstream->get_non_final_response()) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "This is non-final response.";
}
downstream->set_expect_final_response(true);
rv = upstream->on_downstream_header_complete(downstream);
// Now Dowstream's response headers are erased.
if (rv != 0) {
http2session->submit_rst_stream(frame->hd.stream_id,
NGHTTP2_PROTOCOL_ERROR);
downstream->set_response_state(DownstreamState::MSG_RESET);
}
return 0;
}
downstream->set_response_state(DownstreamState::HEADER_COMPLETE);
downstream->check_upgrade_fulfilled_http2();
if (downstream->get_upgraded()) {
resp.connection_close = true;
// On upgrade success, both ends can send data
if (upstream->resume_read(SHRPX_NO_BUFFER, downstream, 0) != 0) {
// If resume_read fails, just drop connection. Not ideal.
delete handler;
return -1;
}
downstream->set_request_state(DownstreamState::HEADER_COMPLETE);
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session)
<< "HTTP upgrade success. stream_id=" << frame->hd.stream_id;
}
} else {
auto content_length = resp.fs.header(http2::HD_CONTENT_LENGTH);
if (content_length) {
// libnghttp2 guarantees this can be parsed
resp.fs.content_length = util::parse_uint(content_length->value);
}
if (resp.fs.content_length == -1 && downstream->expect_response_body()) {
// Here we have response body but Content-Length is not known in
// advance.
if (req.http_major <= 0 || (req.http_major == 1 && req.http_minor == 0)) {
// We simply close connection for pre-HTTP/1.1 in this case.
resp.connection_close = true;
} else {
// Otherwise, use chunked encoding to keep upstream connection
// open. In HTTP2, we are supposed not to receive
// transfer-encoding.
resp.fs.add_header_token(StringRef::from_lit("transfer-encoding"),
StringRef::from_lit("chunked"), false,
http2::HD_TRANSFER_ENCODING);
downstream->set_chunked_response(true);
}
}
}
if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
resp.headers_only = true;
}
if (loggingconf.access.write_early && downstream->accesslog_ready()) {
handler->write_accesslog(downstream);
downstream->set_accesslog_written(true);
}
rv = upstream->on_downstream_header_complete(downstream);
if (rv != 0) {
// Handling early return (in other words, response was hijacked by
// mruby scripting).
if (downstream->get_response_state() == DownstreamState::MSG_COMPLETE) {
http2session->submit_rst_stream(frame->hd.stream_id, NGHTTP2_CANCEL);
} else {
http2session->submit_rst_stream(frame->hd.stream_id,
NGHTTP2_INTERNAL_ERROR);
downstream->set_response_state(DownstreamState::MSG_RESET);
}
}
return 0;
}
} // namespace
namespace {
int on_frame_recv_callback(nghttp2_session *session, const nghttp2_frame *frame,
void *user_data) {
int rv;
auto http2session = static_cast<Http2Session *>(user_data);
switch (frame->hd.type) {
case NGHTTP2_DATA: {
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!sd || !sd->dconn) {
return 0;
}
auto downstream = sd->dconn->get_downstream();
auto upstream = downstream->get_upstream();
rv = upstream->on_downstream_body(downstream, nullptr, 0, true);
if (rv != 0) {
http2session->submit_rst_stream(frame->hd.stream_id,
NGHTTP2_INTERNAL_ERROR);
downstream->set_response_state(DownstreamState::MSG_RESET);
} else if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
downstream->disable_downstream_rtimer();
if (downstream->get_response_state() ==
DownstreamState::HEADER_COMPLETE) {
downstream->set_response_state(DownstreamState::MSG_COMPLETE);
rv = upstream->on_downstream_body_complete(downstream);
if (rv != 0) {
downstream->set_response_state(DownstreamState::MSG_RESET);
}
}
}
call_downstream_readcb(http2session, downstream);
return 0;
}
case NGHTTP2_HEADERS: {
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!sd || !sd->dconn) {
return 0;
}
auto downstream = sd->dconn->get_downstream();
if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE ||
frame->headers.cat == NGHTTP2_HCAT_PUSH_RESPONSE) {
rv = on_response_headers(http2session, downstream, session, frame);
if (rv != 0) {
return 0;
}
} else if (frame->headers.cat == NGHTTP2_HCAT_HEADERS) {
if (downstream->get_expect_final_response()) {
rv = on_response_headers(http2session, downstream, session, frame);
if (rv != 0) {
return 0;
}
}
}
if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
downstream->disable_downstream_rtimer();
if (downstream->get_response_state() ==
DownstreamState::HEADER_COMPLETE) {
downstream->set_response_state(DownstreamState::MSG_COMPLETE);
auto upstream = downstream->get_upstream();
rv = upstream->on_downstream_body_complete(downstream);
if (rv != 0) {
downstream->set_response_state(DownstreamState::MSG_RESET);
}
}
} else {
downstream->reset_downstream_rtimer();
}
// This may delete downstream
call_downstream_readcb(http2session, downstream);
return 0;
}
case NGHTTP2_RST_STREAM: {
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (sd && sd->dconn) {
auto downstream = sd->dconn->get_downstream();
downstream->set_response_rst_stream_error_code(
frame->rst_stream.error_code);
call_downstream_readcb(http2session, downstream);
}
return 0;
}
case NGHTTP2_SETTINGS: {
if ((frame->hd.flags & NGHTTP2_FLAG_ACK) == 0) {
http2session->on_settings_received(frame);
return 0;
}
http2session->stop_settings_timer();
auto addr = http2session->get_addr();
auto &connect_blocker = addr->connect_blocker;
connect_blocker->on_success();
return 0;
}
case NGHTTP2_PING:
if (frame->hd.flags & NGHTTP2_FLAG_ACK) {
if (LOG_ENABLED(INFO)) {
LOG(INFO) << "PING ACK received";
}
http2session->connection_alive();
}
return 0;
case NGHTTP2_PUSH_PROMISE: {
auto promised_stream_id = frame->push_promise.promised_stream_id;
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session)
<< "Received downstream PUSH_PROMISE stream_id="
<< frame->hd.stream_id
<< ", promised_stream_id=" << promised_stream_id;
}
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!sd || !sd->dconn) {
http2session->submit_rst_stream(promised_stream_id, NGHTTP2_CANCEL);
return 0;
}
auto downstream = sd->dconn->get_downstream();
assert(downstream);
assert(downstream->get_downstream_stream_id() == frame->hd.stream_id);
auto promised_sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, promised_stream_id));
if (!promised_sd || !promised_sd->dconn) {
http2session->submit_rst_stream(promised_stream_id, NGHTTP2_CANCEL);
return 0;
}
auto promised_downstream = promised_sd->dconn->get_downstream();
assert(promised_downstream);
if (http2session->handle_downstream_push_promise_complete(
downstream, promised_downstream) != 0) {
http2session->submit_rst_stream(promised_stream_id, NGHTTP2_CANCEL);
return 0;
}
return 0;
}
case NGHTTP2_GOAWAY:
if (LOG_ENABLED(INFO)) {
auto debug_data = util::ascii_dump(frame->goaway.opaque_data,
frame->goaway.opaque_data_len);
SSLOG(INFO, http2session)
<< "GOAWAY received: last-stream-id=" << frame->goaway.last_stream_id
<< ", error_code=" << frame->goaway.error_code
<< ", debug_data=" << debug_data;
}
return 0;
default:
return 0;
}
}
} // namespace
namespace {
int on_data_chunk_recv_callback(nghttp2_session *session, uint8_t flags,
int32_t stream_id, const uint8_t *data,
size_t len, void *user_data) {
int rv;
auto http2session = static_cast<Http2Session *>(user_data);
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, stream_id));
if (!sd || !sd->dconn) {
http2session->submit_rst_stream(stream_id, NGHTTP2_INTERNAL_ERROR);
if (http2session->consume(stream_id, len) != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
auto downstream = sd->dconn->get_downstream();
if (!downstream->expect_response_body()) {
http2session->submit_rst_stream(stream_id, NGHTTP2_INTERNAL_ERROR);
if (http2session->consume(stream_id, len) != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
// We don't want DATA after non-final response, which is illegal in
// HTTP.
if (downstream->get_non_final_response()) {
http2session->submit_rst_stream(stream_id, NGHTTP2_PROTOCOL_ERROR);
if (http2session->consume(stream_id, len) != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
downstream->reset_downstream_rtimer();
auto &resp = downstream->response();
resp.recv_body_length += len;
resp.unconsumed_body_length += len;
auto upstream = downstream->get_upstream();
rv = upstream->on_downstream_body(downstream, data, len, false);
if (rv != 0) {
http2session->submit_rst_stream(stream_id, NGHTTP2_INTERNAL_ERROR);
if (http2session->consume(stream_id, len) != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
downstream->set_response_state(DownstreamState::MSG_RESET);
}
call_downstream_readcb(http2session, downstream);
return 0;
}
} // namespace
namespace {
int on_frame_send_callback(nghttp2_session *session, const nghttp2_frame *frame,
void *user_data) {
auto http2session = static_cast<Http2Session *>(user_data);
if (frame->hd.type == NGHTTP2_DATA || frame->hd.type == NGHTTP2_HEADERS) {
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!sd || !sd->dconn) {
return 0;
}
auto downstream = sd->dconn->get_downstream();
if (frame->hd.type == NGHTTP2_HEADERS &&
frame->headers.cat == NGHTTP2_HCAT_REQUEST) {
downstream->set_request_header_sent(true);
auto src = downstream->get_blocked_request_buf();
if (src->rleft()) {
auto dest = downstream->get_request_buf();
src->remove(*dest);
if (http2session->resume_data(sd->dconn) != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
downstream->ensure_downstream_wtimer();
}
}
if ((frame->hd.flags & NGHTTP2_FLAG_END_STREAM) == 0) {
return 0;
}
downstream->reset_downstream_rtimer();
return 0;
}
if (frame->hd.type == NGHTTP2_SETTINGS &&
(frame->hd.flags & NGHTTP2_FLAG_ACK) == 0) {
http2session->start_settings_timer();
}
return 0;
}
} // namespace
namespace {
int on_frame_not_send_callback(nghttp2_session *session,
const nghttp2_frame *frame, int lib_error_code,
void *user_data) {
auto http2session = static_cast<Http2Session *>(user_data);
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "Failed to send control frame type="
<< static_cast<uint32_t>(frame->hd.type)
<< ", lib_error_code=" << lib_error_code << ": "
<< nghttp2_strerror(lib_error_code);
}
if (frame->hd.type != NGHTTP2_HEADERS ||
lib_error_code == NGHTTP2_ERR_STREAM_CLOSED ||
lib_error_code == NGHTTP2_ERR_STREAM_CLOSING) {
return 0;
}
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (!sd) {
return 0;
}
if (!sd->dconn) {
return 0;
}
auto downstream = sd->dconn->get_downstream();
if (lib_error_code == NGHTTP2_ERR_START_STREAM_NOT_ALLOWED) {
// Migrate to another downstream connection.
auto upstream = downstream->get_upstream();
if (upstream->on_downstream_reset(downstream, false)) {
// This should be done for h1 upstream only. Deleting
// ClientHandler for h2 upstream may lead to crash.
delete upstream->get_client_handler();
}
return 0;
}
// To avoid stream hanging around, flag DownstreamState::MSG_RESET.
downstream->set_response_state(DownstreamState::MSG_RESET);
call_downstream_readcb(http2session, downstream);
return 0;
}
} // namespace
namespace {
constexpr auto PADDING = std::array<uint8_t, 256>{};
} // namespace
namespace {
int send_data_callback(nghttp2_session *session, nghttp2_frame *frame,
const uint8_t *framehd, size_t length,
nghttp2_data_source *source, void *user_data) {
auto http2session = static_cast<Http2Session *>(user_data);
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if (sd == nullptr) {
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
auto dconn = sd->dconn;
auto downstream = dconn->get_downstream();
auto input = downstream->get_request_buf();
auto wb = http2session->get_request_buf();
size_t padlen = 0;
wb->append(framehd, 9);
if (frame->data.padlen > 0) {
padlen = frame->data.padlen - 1;
wb->append(static_cast<uint8_t>(padlen));
}
input->remove(*wb, length);
wb->append(PADDING.data(), padlen);
if (input->rleft() == 0) {
downstream->disable_downstream_wtimer();
} else {
downstream->reset_downstream_wtimer();
}
if (length > 0) {
// This is important because it will handle flow control
// stuff.
if (downstream->get_upstream()->resume_read(SHRPX_NO_BUFFER, downstream,
length) != 0) {
// In this case, downstream may be deleted.
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
// Here sd->dconn could be nullptr, because
// Upstream::resume_read() may delete downstream which will delete
// dconn. Is this still really true?
}
return 0;
}
} // namespace
nghttp2_session_callbacks *create_http2_downstream_callbacks() {
int rv;
nghttp2_session_callbacks *callbacks;
rv = nghttp2_session_callbacks_new(&callbacks);
if (rv != 0) {
return nullptr;
}
nghttp2_session_callbacks_set_on_stream_close_callback(
callbacks, on_stream_close_callback);
nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks,
on_frame_recv_callback);
nghttp2_session_callbacks_set_on_data_chunk_recv_callback(
callbacks, on_data_chunk_recv_callback);
nghttp2_session_callbacks_set_on_frame_send_callback(callbacks,
on_frame_send_callback);
nghttp2_session_callbacks_set_on_frame_not_send_callback(
callbacks, on_frame_not_send_callback);
nghttp2_session_callbacks_set_on_header_callback2(callbacks,
on_header_callback2);
nghttp2_session_callbacks_set_on_invalid_header_callback2(
callbacks, on_invalid_header_callback2);
nghttp2_session_callbacks_set_on_begin_headers_callback(
callbacks, on_begin_headers_callback);
nghttp2_session_callbacks_set_send_data_callback(callbacks,
send_data_callback);
if (get_config()->padding) {
nghttp2_session_callbacks_set_select_padding_callback(
callbacks, http::select_padding_callback);
}
return callbacks;
}
int Http2Session::connection_made() {
int rv;
state_ = Http2SessionState::CONNECTED;
on_write_ = &Http2Session::downstream_write;
on_read_ = &Http2Session::downstream_read;
if (addr_->tls) {
const unsigned char *next_proto = nullptr;
unsigned int next_proto_len = 0;
#ifndef OPENSSL_NO_NEXTPROTONEG
SSL_get0_next_proto_negotiated(conn_.tls.ssl, &next_proto, &next_proto_len);
#endif // !OPENSSL_NO_NEXTPROTONEG
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
if (!next_proto) {
SSL_get0_alpn_selected(conn_.tls.ssl, &next_proto, &next_proto_len);
}
#endif // OPENSSL_VERSION_NUMBER >= 0x10002000L
if (!next_proto) {
downstream_failure(addr_, raddr_);
return -1;
}
auto proto = StringRef{next_proto, next_proto_len};
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Negotiated next protocol: " << proto;
}
if (!util::check_h2_is_selected(proto)) {
downstream_failure(addr_, raddr_);
return -1;
}
}
auto config = get_config();
auto &http2conf = config->http2;
rv = nghttp2_session_client_new2(&session_, http2conf.downstream.callbacks,
this, http2conf.downstream.option);
if (rv != 0) {
return -1;
}
std::array<nghttp2_settings_entry, 4> entry;
size_t nentry = 2;
entry[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
entry[0].value = http2conf.downstream.max_concurrent_streams;
entry[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
entry[1].value = http2conf.downstream.window_size;
if (http2conf.no_server_push || config->http2_proxy) {
entry[nentry].settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH;
entry[nentry].value = 0;
++nentry;
}
if (http2conf.downstream.decoder_dynamic_table_size !=
NGHTTP2_DEFAULT_HEADER_TABLE_SIZE) {
entry[nentry].settings_id = NGHTTP2_SETTINGS_HEADER_TABLE_SIZE;
entry[nentry].value = http2conf.downstream.decoder_dynamic_table_size;
++nentry;
}
rv = nghttp2_submit_settings(session_, NGHTTP2_FLAG_NONE, entry.data(),
nentry);
if (rv != 0) {
return -1;
}
rv = nghttp2_session_set_local_window_size(
session_, NGHTTP2_FLAG_NONE, 0,
http2conf.downstream.connection_window_size);
if (rv != 0) {
return -1;
}
reset_connection_check_timer(CONNCHK_TIMEOUT);
submit_pending_requests();
signal_write();
return 0;
}
int Http2Session::do_read() { return read_(*this); }
int Http2Session::do_write() { return write_(*this); }
int Http2Session::on_read(const uint8_t *data, size_t datalen) {
return on_read_(*this, data, datalen);
}
int Http2Session::on_write() { return on_write_(*this); }
int Http2Session::downstream_read(const uint8_t *data, size_t datalen) {
ssize_t rv;
rv = nghttp2_session_mem_recv(session_, data, datalen);
if (rv < 0) {
SSLOG(ERROR, this) << "nghttp2_session_mem_recv() returned error: "
<< nghttp2_strerror(rv);
return -1;
}
if (nghttp2_session_want_read(session_) == 0 &&
nghttp2_session_want_write(session_) == 0 && wb_.rleft() == 0) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "No more read/write for this HTTP2 session";
}
return -1;
}
signal_write();
return 0;
}
int Http2Session::downstream_write() {
for (;;) {
const uint8_t *data;
auto datalen = nghttp2_session_mem_send(session_, &data);
if (datalen < 0) {
SSLOG(ERROR, this) << "nghttp2_session_mem_send() returned error: "
<< nghttp2_strerror(datalen);
return -1;
}
if (datalen == 0) {
break;
}
wb_.append(data, datalen);
if (wb_.rleft() >= MAX_BUFFER_SIZE) {
break;
}
}
if (nghttp2_session_want_read(session_) == 0 &&
nghttp2_session_want_write(session_) == 0 && wb_.rleft() == 0) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "No more read/write for this session";
}
return -1;
}
return 0;
}
void Http2Session::signal_write() {
switch (state_) {
case Http2SessionState::DISCONNECTED:
if (!ev_is_active(&initiate_connection_timer_)) {
if (LOG_ENABLED(INFO)) {
LOG(INFO) << "Start connecting to backend server";
}
// Since the timer is set to 0., these will feed 2 events. We
// will stop the timer in the initiate_connection_timer_ to void
// 2nd event.
ev_timer_start(conn_.loop, &initiate_connection_timer_);
ev_feed_event(conn_.loop, &initiate_connection_timer_, 0);
}
break;
case Http2SessionState::CONNECTED:
conn_.wlimit.startw();
break;
default:
break;
}
}
struct ev_loop *Http2Session::get_loop() const {
return conn_.loop;
}
ev_io *Http2Session::get_wev() { return &conn_.wev; }
Http2SessionState Http2Session::get_state() const { return state_; }
void Http2Session::set_state(Http2SessionState state) { state_ = state; }
int Http2Session::terminate_session(uint32_t error_code) {
int rv;
rv = nghttp2_session_terminate_session(session_, error_code);
if (rv != 0) {
return -1;
}
return 0;
}
SSL *Http2Session::get_ssl() const { return conn_.tls.ssl; }
int Http2Session::consume(int32_t stream_id, size_t len) {
int rv;
if (!session_) {
return 0;
}
rv = nghttp2_session_consume(session_, stream_id, len);
if (rv != 0) {
SSLOG(WARN, this) << "nghttp2_session_consume() returned error: "
<< nghttp2_strerror(rv);
return -1;
}
return 0;
}
bool Http2Session::can_push_request(const Downstream *downstream) const {
auto &req = downstream->request();
return state_ == Http2SessionState::CONNECTED &&
connection_check_state_ == ConnectionCheck::NONE &&
(req.connect_proto == ConnectProto::NONE || settings_recved_);
}
void Http2Session::start_checking_connection() {
if (state_ != Http2SessionState::CONNECTED ||
connection_check_state_ != ConnectionCheck::REQUIRED) {
return;
}
connection_check_state_ = ConnectionCheck::STARTED;
SSLOG(INFO, this) << "Start checking connection";
// If connection is down, we may get error when writing data. Issue
// ping frame to see whether connection is alive.
nghttp2_submit_ping(session_, NGHTTP2_FLAG_NONE, nullptr);
// set ping timeout and start timer again
reset_connection_check_timer(CONNCHK_PING_TIMEOUT);
signal_write();
}
void Http2Session::reset_connection_check_timer(ev_tstamp t) {
connchk_timer_.repeat = t;
ev_timer_again(conn_.loop, &connchk_timer_);
}
void Http2Session::reset_connection_check_timer_if_not_checking() {
if (connection_check_state_ != ConnectionCheck::NONE) {
return;
}
reset_connection_check_timer(CONNCHK_TIMEOUT);
}
void Http2Session::connection_alive() {
reset_connection_check_timer(CONNCHK_TIMEOUT);
if (connection_check_state_ == ConnectionCheck::NONE) {
return;
}
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Connection alive";
}
connection_check_state_ = ConnectionCheck::NONE;
submit_pending_requests();
}
void Http2Session::submit_pending_requests() {
for (auto dconn = dconns_.head; dconn; dconn = dconn->dlnext) {
auto downstream = dconn->get_downstream();
if (!downstream->get_request_pending() ||
!downstream->request_submission_ready()) {
continue;
}
auto &req = downstream->request();
if (req.connect_proto != ConnectProto::NONE && !settings_recved_) {
continue;
}
auto upstream = downstream->get_upstream();
if (dconn->push_request_headers() != 0) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "backend request failed";
}
upstream->on_downstream_abort_request(downstream, 400);
continue;
}
upstream->resume_read(SHRPX_NO_BUFFER, downstream, 0);
}
}
void Http2Session::set_connection_check_state(ConnectionCheck state) {
connection_check_state_ = state;
}
ConnectionCheck Http2Session::get_connection_check_state() const {
return connection_check_state_;
}
int Http2Session::noop() { return 0; }
int Http2Session::read_noop(const uint8_t *data, size_t datalen) { return 0; }
int Http2Session::write_noop() { return 0; }
int Http2Session::connected() {
auto sock_error = util::get_socket_error(conn_.fd);
if (sock_error != 0) {
SSLOG(WARN, this) << "Backend connect failed; addr="
<< util::to_numeric_addr(raddr_)
<< ": errno=" << sock_error;
downstream_failure(addr_, raddr_);
return -1;
}
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Connection established";
}
// Reset timeout for write. Previously, we set timeout for connect.
conn_.wt.repeat = group_->shared_addr->timeout.write;
ev_timer_again(conn_.loop, &conn_.wt);
conn_.rlimit.startw();
conn_.again_rt();
read_ = &Http2Session::read_clear;
write_ = &Http2Session::write_clear;
if (state_ == Http2SessionState::PROXY_CONNECTING) {
return do_write();
}
if (conn_.tls.ssl) {
read_ = &Http2Session::tls_handshake;
write_ = &Http2Session::tls_handshake;
return do_write();
}
if (connection_made() != 0) {
state_ = Http2SessionState::CONNECT_FAILING;
return -1;
}
return 0;
}
int Http2Session::read_clear() {
conn_.last_read = ev_now(conn_.loop);
std::array<uint8_t, 16_k> buf;
for (;;) {
auto nread = conn_.read_clear(buf.data(), buf.size());
if (nread == 0) {
return write_clear();
}
if (nread < 0) {
return nread;
}
if (on_read(buf.data(), nread) != 0) {
return -1;
}
}
}
int Http2Session::write_clear() {
conn_.last_read = ev_now(conn_.loop);
std::array<struct iovec, MAX_WR_IOVCNT> iov;
for (;;) {
if (wb_.rleft() > 0) {
auto iovcnt = wb_.riovec(iov.data(), iov.size());
auto nwrite = conn_.writev_clear(iov.data(), iovcnt);
if (nwrite == 0) {
return 0;
}
if (nwrite < 0) {
// We may have pending data in receive buffer which may
// contain part of response body. So keep reading. Invoke
// read event to get read(2) error just in case.
ev_feed_event(conn_.loop, &conn_.rev, EV_READ);
write_ = &Http2Session::write_void;
break;
}
wb_.drain(nwrite);
continue;
}
if (on_write() != 0) {
return -1;
}
if (wb_.rleft() == 0) {
break;
}
}
conn_.wlimit.stopw();
ev_timer_stop(conn_.loop, &conn_.wt);
return 0;
}
int Http2Session::tls_handshake() {
conn_.last_read = ev_now(conn_.loop);
ERR_clear_error();
auto rv = conn_.tls_handshake();
if (rv == SHRPX_ERR_INPROGRESS) {
return 0;
}
if (rv < 0) {
downstream_failure(addr_, raddr_);
return rv;
}
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "SSL/TLS handshake completed";
}
if (!get_config()->tls.insecure &&
tls::check_cert(conn_.tls.ssl, addr_, raddr_) != 0) {
downstream_failure(addr_, raddr_);
return -1;
}
read_ = &Http2Session::read_tls;
write_ = &Http2Session::write_tls;
if (connection_made() != 0) {
state_ = Http2SessionState::CONNECT_FAILING;
return -1;
}
return 0;
}
int Http2Session::read_tls() {
conn_.last_read = ev_now(conn_.loop);
std::array<uint8_t, 16_k> buf;
ERR_clear_error();
for (;;) {
auto nread = conn_.read_tls(buf.data(), buf.size());
if (nread == 0) {
return write_tls();
}
if (nread < 0) {
return nread;
}
if (on_read(buf.data(), nread) != 0) {
return -1;
}
}
}
int Http2Session::write_tls() {
conn_.last_read = ev_now(conn_.loop);
ERR_clear_error();
struct iovec iov;
for (;;) {
if (wb_.rleft() > 0) {
auto iovcnt = wb_.riovec(&iov, 1);
if (iovcnt != 1) {
assert(0);
return -1;
}
auto nwrite = conn_.write_tls(iov.iov_base, iov.iov_len);
if (nwrite == 0) {
return 0;
}
if (nwrite < 0) {
// We may have pending data in receive buffer which may
// contain part of response body. So keep reading. Invoke
// read event to get read(2) error just in case.
ev_feed_event(conn_.loop, &conn_.rev, EV_READ);
write_ = &Http2Session::write_void;
break;
}
wb_.drain(nwrite);
continue;
}
if (on_write() != 0) {
return -1;
}
if (wb_.rleft() == 0) {
conn_.start_tls_write_idle();
break;
}
}
conn_.wlimit.stopw();
ev_timer_stop(conn_.loop, &conn_.wt);
return 0;
}
int Http2Session::write_void() {
conn_.wlimit.stopw();
return 0;
}
bool Http2Session::should_hard_fail() const {
switch (state_) {
case Http2SessionState::PROXY_CONNECTING:
case Http2SessionState::PROXY_FAILED:
return true;
case Http2SessionState::DISCONNECTED: {
const auto &proxy = get_config()->downstream_http_proxy;
return !proxy.host.empty();
}
default:
return false;
}
}
DownstreamAddr *Http2Session::get_addr() const { return addr_; }
int Http2Session::handle_downstream_push_promise(Downstream *downstream,
int32_t promised_stream_id) {
auto upstream = downstream->get_upstream();
if (!upstream->push_enabled()) {
return -1;
}
auto promised_downstream =
upstream->on_downstream_push_promise(downstream, promised_stream_id);
if (!promised_downstream) {
return -1;
}
// Now we have Downstream object for pushed stream.
// promised_downstream->get_stream() still returns 0.
auto handler = upstream->get_client_handler();
auto promised_dconn = std::make_unique<Http2DownstreamConnection>(this);
promised_dconn->set_client_handler(handler);
auto ptr = promised_dconn.get();
if (promised_downstream->attach_downstream_connection(
std::move(promised_dconn)) != 0) {
return -1;
}
auto promised_sd = std::make_unique<StreamData>();
nghttp2_session_set_stream_user_data(session_, promised_stream_id,
promised_sd.get());
ptr->attach_stream_data(promised_sd.get());
streams_.append(promised_sd.release());
return 0;
}
int Http2Session::handle_downstream_push_promise_complete(
Downstream *downstream, Downstream *promised_downstream) {
auto &promised_req = promised_downstream->request();
auto &promised_balloc = promised_downstream->get_block_allocator();
auto authority = promised_req.fs.header(http2::HD__AUTHORITY);
auto path = promised_req.fs.header(http2::HD__PATH);
auto method = promised_req.fs.header(http2::HD__METHOD);
auto scheme = promised_req.fs.header(http2::HD__SCHEME);
if (!authority) {
authority = promised_req.fs.header(http2::HD_HOST);
}
auto method_token = http2::lookup_method_token(method->value);
if (method_token == -1) {
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Unrecognized method: " << method->value;
}
return -1;
}
// TODO Rewrite authority if we enabled rewrite host. But we
// really don't know how to rewrite host. Should we use the same
// host in associated stream?
if (authority) {
promised_req.authority = authority->value;
}
promised_req.method = method_token;
// libnghttp2 ensures that we don't have CONNECT method in
// PUSH_PROMISE, and guarantees that :scheme exists.
if (scheme) {
promised_req.scheme = scheme->value;
}
// For server-wide OPTIONS request, path is empty.
if (method_token != HTTP_OPTIONS || path->value != "*") {
promised_req.path = http2::rewrite_clean_path(promised_balloc, path->value);
}
promised_downstream->inspect_http2_request();
auto upstream = promised_downstream->get_upstream();
promised_downstream->set_request_state(DownstreamState::MSG_COMPLETE);
promised_downstream->set_request_header_sent(true);
if (upstream->on_downstream_push_promise_complete(downstream,
promised_downstream) != 0) {
return -1;
}
return 0;
}
size_t Http2Session::get_num_dconns() const { return dconns_.size(); }
bool Http2Session::max_concurrency_reached(size_t extra) const {
if (!session_) {
return dconns_.size() + extra >= 100;
}
// If session does not allow further requests, it effectively means
// that maximum concurrency is reached.
return !nghttp2_session_check_request_allowed(session_) ||
dconns_.size() + extra >=
nghttp2_session_get_remote_settings(
session_, NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS);
}
const std::shared_ptr<DownstreamAddrGroup> &
Http2Session::get_downstream_addr_group() const {
return group_;
}
void Http2Session::add_to_extra_freelist() {
if (freelist_zone_ != FreelistZone::NONE) {
return;
}
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Append to http2_extra_freelist, addr=" << addr_
<< ", freelist.size="
<< addr_->http2_extra_freelist.size();
}
freelist_zone_ = FreelistZone::EXTRA;
addr_->http2_extra_freelist.append(this);
}
void Http2Session::remove_from_freelist() {
switch (freelist_zone_) {
case FreelistZone::NONE:
return;
case FreelistZone::EXTRA:
if (LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Remove from http2_extra_freelist, addr=" << addr_
<< ", freelist.size="
<< addr_->http2_extra_freelist.size();
}
addr_->http2_extra_freelist.remove(this);
break;
case FreelistZone::GONE:
return;
}
freelist_zone_ = FreelistZone::NONE;
}
void Http2Session::exclude_from_scheduling() {
remove_from_freelist();
freelist_zone_ = FreelistZone::GONE;
}
DefaultMemchunks *Http2Session::get_request_buf() { return &wb_; }
void Http2Session::on_timeout() {
switch (state_) {
case Http2SessionState::PROXY_CONNECTING: {
auto worker_blocker = worker_->get_connect_blocker();
worker_blocker->on_failure();
break;
}
case Http2SessionState::CONNECTING:
SSLOG(WARN, this) << "Connect time out; addr="
<< util::to_numeric_addr(raddr_);
downstream_failure(addr_, raddr_);
break;
default:
break;
}
}
void Http2Session::check_retire() {
if (!group_->retired) {
return;
}
ev_prepare_stop(conn_.loop, &prep_);
if (!session_) {
return;
}
auto last_stream_id = nghttp2_session_get_last_proc_stream_id(session_);
nghttp2_submit_goaway(session_, NGHTTP2_FLAG_NONE, last_stream_id,
NGHTTP2_NO_ERROR, nullptr, 0);
signal_write();
}
const Address *Http2Session::get_raddr() const { return raddr_; }
void Http2Session::on_settings_received(const nghttp2_frame *frame) {
// TODO This effectively disallows nghttpx to change its behaviour
// based on the 2nd SETTINGS.
if (settings_recved_) {
return;
}
settings_recved_ = true;
for (size_t i = 0; i < frame->settings.niv; ++i) {
auto &ent = frame->settings.iv[i];
if (ent.settings_id == NGHTTP2_SETTINGS_ENABLE_CONNECT_PROTOCOL) {
allow_connect_proto_ = true;
break;
}
}
submit_pending_requests();
}
bool Http2Session::get_allow_connect_proto() const {
return allow_connect_proto_;
}
} // namespace shrpx
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