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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>
#include <unistd.h>
#include <vector>
#include <openssl/err.h>
#include <event2/bufferevent_ssl.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_ssl.h"
#include "shrpx_http.h"
#include "http2.h"
#include "util.h"
#include "base64.h"
using namespace nghttp2;
namespace shrpx {
Http2Session::Http2Session(event_base *evbase, SSL_CTX *ssl_ctx)
: evbase_(evbase),
ssl_ctx_(ssl_ctx),
ssl_(nullptr),
session_(nullptr),
bev_(nullptr),
wrbev_(nullptr),
rdbev_(nullptr),
settings_timerev_(nullptr),
fd_(-1),
state_(DISCONNECTED),
notified_(false),
flow_control_(false)
{}
Http2Session::~Http2Session()
{
disconnect();
}
int Http2Session::disconnect()
{
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Disconnecting";
}
nghttp2_session_del(session_);
session_ = nullptr;
if(settings_timerev_) {
event_free(settings_timerev_);
settings_timerev_ = nullptr;
}
if(ssl_) {
SSL_set_shutdown(ssl_, SSL_RECEIVED_SHUTDOWN);
SSL_shutdown(ssl_);
}
if(bev_) {
int fd = bufferevent_getfd(bev_);
bufferevent_disable(bev_, EV_READ | EV_WRITE);
bufferevent_free(bev_);
bev_ = nullptr;
if(fd != -1) {
if(fd_ == -1) {
fd_ = fd;
} else if(fd != fd_) {
SSLOG(WARNING, this) << "fd in bev_ != fd_";
shutdown(fd, SHUT_WR);
close(fd);
}
}
}
if(ssl_) {
SSL_free(ssl_);
}
ssl_ = nullptr;
if(fd_ != -1) {
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Closing fd=" << fd_;
}
shutdown(fd_, SHUT_WR);
close(fd_);
fd_ = -1;
}
if(proxy_htp_) {
proxy_htp_.reset();
}
notified_ = false;
state_ = DISCONNECTED;
// Delete all client handler associated to Downstream. When deleting
// Http2DownstreamConnection, it calls this object's
// remove_downstream_connection(). The multiple
// Http2DownstreamConnection objects belong to the same ClientHandler
// object. So first dump ClientHandler objects and delete them once
// and for all.
std::vector<Http2DownstreamConnection*> vec(std::begin(dconns_),
std::end(dconns_));
std::set<ClientHandler*> handlers;
for(auto dc : vec) {
handlers.insert(dc->get_client_handler());
}
for(auto& h : handlers) {
delete h;
}
dconns_.clear();
for(auto& s : streams_) {
delete s;
}
streams_.clear();
return 0;
}
namespace {
void notify_readcb(bufferevent *bev, void *arg)
{
int rv;
auto http2session = static_cast<Http2Session*>(arg);
http2session->clear_notify();
switch(http2session->get_state()) {
case Http2Session::DISCONNECTED:
rv = http2session->initiate_connection();
if(rv != 0) {
SSLOG(FATAL, http2session)
<< "Could not initiate backend connection";
http2session->disconnect();
}
break;
case Http2Session::CONNECTED:
rv = http2session->send();
if(rv != 0) {
http2session->disconnect();
}
break;
}
}
} // namespace
namespace {
void notify_eventcb(bufferevent *bev, short events, void *arg)
{
auto http2session = static_cast<Http2Session*>(arg);
// TODO should DIE()?
if(events & BEV_EVENT_EOF) {
SSLOG(ERROR, http2session) << "Notification connection lost: EOF";
}
if(events & BEV_EVENT_TIMEOUT) {
SSLOG(ERROR, http2session) << "Notification connection lost: timeout";
}
if(events & BEV_EVENT_ERROR) {
SSLOG(ERROR, http2session) << "Notification connection lost: network error";
}
}
} // namespace
int Http2Session::init_notification()
{
int rv;
int sockpair[2];
rv = socketpair(AF_UNIX, SOCK_STREAM, 0, sockpair);
if(rv == -1) {
SSLOG(FATAL, this) << "socketpair() failed: errno=" << errno;
return -1;
}
evutil_make_socket_nonblocking(sockpair[0]);
evutil_make_socket_nonblocking(sockpair[1]);
wrbev_ = bufferevent_socket_new(evbase_, sockpair[0],
BEV_OPT_CLOSE_ON_FREE|
BEV_OPT_DEFER_CALLBACKS);
if(!wrbev_) {
SSLOG(FATAL, this) << "bufferevent_socket_new() failed";
for(int i = 0; i < 2; ++i) {
close(sockpair[i]);
}
return -1;
}
rdbev_ = bufferevent_socket_new(evbase_, sockpair[1],
BEV_OPT_CLOSE_ON_FREE|
BEV_OPT_DEFER_CALLBACKS);
if(!rdbev_) {
SSLOG(FATAL, this) << "bufferevent_socket_new() failed";
close(sockpair[1]);
return -1;
}
bufferevent_enable(rdbev_, EV_READ);
bufferevent_setcb(rdbev_, notify_readcb, nullptr, notify_eventcb, this);
return 0;
}
namespace {
void readcb(bufferevent *bev, void *ptr)
{
int rv;
auto http2session = static_cast<Http2Session*>(ptr);
rv = http2session->on_read();
if(rv != 0) {
http2session->disconnect();
}
}
} // namespace
namespace {
void writecb(bufferevent *bev, void *ptr)
{
if(evbuffer_get_length(bufferevent_get_output(bev)) > 0) {
return;
}
int rv;
auto http2session = static_cast<Http2Session*>(ptr);
rv = http2session->on_write();
if(rv != 0) {
http2session->disconnect();
}
}
} // namespace
namespace {
void eventcb(bufferevent *bev, short events, void *ptr)
{
auto http2session = static_cast<Http2Session*>(ptr);
if(events & BEV_EVENT_CONNECTED) {
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "Connection established";
}
http2session->set_state(Http2Session::CONNECTED);
if((!get_config()->downstream_no_tls &&
!get_config()->insecure && http2session->check_cert() != 0) ||
http2session->on_connect() != 0) {
http2session->disconnect();
return;
}
int fd = bufferevent_getfd(bev);
int val = 1;
if(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
reinterpret_cast<char *>(&val), sizeof(val)) == -1) {
SSLOG(WARNING, http2session)
<< "Setting option TCP_NODELAY failed: errno=" << errno;
}
} else if(events & BEV_EVENT_EOF) {
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "EOF";
}
http2session->disconnect();
} else if(events & (BEV_EVENT_ERROR | BEV_EVENT_TIMEOUT)) {
if(LOG_ENABLED(INFO)) {
if(events & BEV_EVENT_ERROR) {
SSLOG(INFO, http2session) << "Network error";
} else {
SSLOG(INFO, http2session) << "Timeout";
}
}
http2session->disconnect();
}
}
} // namespace
namespace {
void proxy_readcb(bufferevent *bev, void *ptr)
{
auto http2session = static_cast<Http2Session*>(ptr);
if(http2session->on_read_proxy() == 0) {
switch(http2session->get_state()) {
case Http2Session::PROXY_CONNECTED:
// The current bufferevent is no longer necessary, so delete it
// here. But we keep fd_ inside it.
http2session->unwrap_free_bev();
// Initiate SSL/TLS handshake through established tunnel.
if(http2session->initiate_connection() != 0) {
http2session->disconnect();
}
break;
case Http2Session::PROXY_FAILED:
http2session->disconnect();
break;
}
} else {
http2session->disconnect();
}
}
} // namespace
namespace {
void proxy_eventcb(bufferevent *bev, short events, void *ptr)
{
auto http2session = static_cast<Http2Session*>(ptr);
if(events & BEV_EVENT_CONNECTED) {
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "Connected to the proxy";
}
std::string req = "CONNECT ";
req += get_config()->downstream_hostport;
req += " HTTP/1.1\r\nHost: ";
req += get_config()->downstream_host;
req += "\r\n";
if(get_config()->downstream_http_proxy_userinfo) {
req += "Proxy-Authorization: Basic ";
size_t len = strlen(get_config()->downstream_http_proxy_userinfo);
req += base64::encode(get_config()->downstream_http_proxy_userinfo,
get_config()->downstream_http_proxy_userinfo+len);
req += "\r\n";
}
req += "\r\n";
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "HTTP proxy request headers\n" << req;
}
if(bufferevent_write(bev, req.c_str(), req.size()) != 0) {
SSLOG(ERROR, http2session) << "bufferevent_write() failed";
http2session->disconnect();
}
} else if(events & BEV_EVENT_EOF) {
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "Proxy EOF";
}
http2session->disconnect();
} else if(events & (BEV_EVENT_ERROR | BEV_EVENT_TIMEOUT)) {
if(LOG_ENABLED(INFO)) {
if(events & BEV_EVENT_ERROR) {
SSLOG(INFO, http2session) << "Network error";
} else {
SSLOG(INFO, http2session) << "Timeout";
}
}
http2session->disconnect();
}
}
} // namespace
int Http2Session::check_cert()
{
return ssl::check_cert(ssl_);
}
int Http2Session::initiate_connection()
{
int rv = 0;
if(get_config()->downstream_http_proxy_host && state_ == DISCONNECTED) {
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Connecting to the proxy "
<< get_config()->downstream_http_proxy_host << ":"
<< get_config()->downstream_http_proxy_port;
}
bev_ = bufferevent_socket_new(evbase_, -1, BEV_OPT_DEFER_CALLBACKS);
if(!bev_) {
SSLOG(ERROR, this) << "bufferevent_socket_new() failed";
return SHRPX_ERR_NETWORK;
}
bufferevent_enable(bev_, EV_READ);
bufferevent_set_timeouts(bev_, &get_config()->downstream_read_timeout,
&get_config()->downstream_write_timeout);
// No need to set writecb because we write the request when
// connected at once.
bufferevent_setcb(bev_, proxy_readcb, nullptr, proxy_eventcb, this);
rv = bufferevent_socket_connect
(bev_,
const_cast<sockaddr*>(&get_config()->downstream_http_proxy_addr.sa),
get_config()->downstream_http_proxy_addrlen);
if(rv != 0) {
SSLOG(ERROR, this) << "Failed to connect to the proxy "
<< get_config()->downstream_http_proxy_host << ":"
<< get_config()->downstream_http_proxy_port;
return SHRPX_ERR_NETWORK;
}
proxy_htp_ = util::make_unique<http_parser>();
http_parser_init(proxy_htp_.get(), HTTP_RESPONSE);
proxy_htp_->data = this;
state_ = PROXY_CONNECTING;
} else if(state_ == DISCONNECTED || state_ == PROXY_CONNECTED) {
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "Connecting to downstream server";
}
if(ssl_ctx_) {
// We are establishing TLS connection.
ssl_ = SSL_new(ssl_ctx_);
if(!ssl_) {
SSLOG(ERROR, this) << "SSL_new() failed: "
<< ERR_error_string(ERR_get_error(), NULL);
return -1;
}
const char *sni_name = nullptr;
if ( get_config()->backend_tls_sni_name ) {
sni_name = get_config()->backend_tls_sni_name;
}
else {
sni_name = get_config()->downstream_host;
}
if(!util::numeric_host(sni_name)) {
// 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(ssl_, sni_name);
}
// If state_ == PROXY_CONNECTED, we has connected to the proxy
// using fd_ and tunnel has been established.
bev_ = bufferevent_openssl_socket_new(evbase_, fd_, ssl_,
BUFFEREVENT_SSL_CONNECTING,
BEV_OPT_DEFER_CALLBACKS);
if(!bev_) {
SSLOG(ERROR, this) << "bufferevent_socket_new() failed";
return SHRPX_ERR_NETWORK;
}
rv = bufferevent_socket_connect
(bev_,
// TODO maybe not thread-safe?
const_cast<sockaddr*>(&get_config()->downstream_addr.sa),
get_config()->downstream_addrlen);
} else if(state_ == DISCONNECTED) {
// Without TLS and proxy.
bev_ = bufferevent_socket_new(evbase_, -1, BEV_OPT_DEFER_CALLBACKS);
if(!bev_) {
SSLOG(ERROR, this) << "bufferevent_socket_new() failed";
return SHRPX_ERR_NETWORK;
}
rv = bufferevent_socket_connect
(bev_,
const_cast<sockaddr*>(&get_config()->downstream_addr.sa),
get_config()->downstream_addrlen);
} else {
assert(state_ == PROXY_CONNECTED);
// Without TLS but with proxy.
bev_ = bufferevent_socket_new(evbase_, fd_, BEV_OPT_DEFER_CALLBACKS);
if(!bev_) {
SSLOG(ERROR, this) << "bufferevent_socket_new() failed";
return SHRPX_ERR_NETWORK;
}
// Connection already established.
eventcb(bev_, BEV_EVENT_CONNECTED, this);
// eventcb() has no return value. Check state_ to whether it was
// failed or not.
if(state_ == DISCONNECTED) {
return -1;
}
}
if(rv != 0) {
return SHRPX_ERR_NETWORK;
}
bufferevent_setwatermark(bev_, EV_READ, 0, SHRPX_READ_WARTER_MARK);
bufferevent_enable(bev_, EV_READ);
bufferevent_setcb(bev_, readcb, writecb, eventcb, this);
// Set timeout for HTTP2 session
bufferevent_set_timeouts(bev_, &get_config()->downstream_read_timeout,
&get_config()->downstream_write_timeout);
// We have been already connected when no TLS and proxy is used.
if(state_ != CONNECTED) {
state_ = CONNECTING;
}
} else {
// Unreachable
DIE();
}
return 0;
}
void Http2Session::unwrap_free_bev()
{
assert(fd_ == -1);
fd_ = bufferevent_getfd(bev_);
bufferevent_free(bev_);
bev_ = nullptr;
}
namespace {
int htp_hdrs_completecb(http_parser *htp)
{
auto http2session = static_cast<Http2Session*>(htp->data);
// We just check status code here
if(htp->status_code == 200) {
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "Tunneling success";
}
http2session->set_state(Http2Session::PROXY_CONNECTED);
} else {
SSLOG(WARNING, http2session) << "Tunneling failed";
http2session->set_state(Http2Session::PROXY_FAILED);
}
return 0;
}
} // namespace
namespace {
http_parser_settings htp_hooks = {
nullptr, /*http_cb on_message_begin;*/
nullptr, /*http_data_cb on_url;*/
nullptr, /*http_cb on_status_complete */
nullptr, /*http_data_cb on_header_field;*/
nullptr, /*http_data_cb on_header_value;*/
htp_hdrs_completecb, /*http_cb on_headers_complete;*/
nullptr, /*http_data_cb on_body;*/
nullptr /*http_cb on_message_complete;*/
};
} // namespace
int Http2Session::on_read_proxy()
{
auto input = bufferevent_get_input(bev_);
auto mem = evbuffer_pullup(input, -1);
size_t nread = http_parser_execute(proxy_htp_.get(), &htp_hooks,
reinterpret_cast<const char*>(mem),
evbuffer_get_length(input));
if(evbuffer_drain(input, nread) != 0) {
SSLOG(FATAL, this) << "evbuffer_drain() failed";
return -1;
}
auto htperr = HTTP_PARSER_ERRNO(proxy_htp_.get());
if(htperr == HPE_OK) {
return 0;
} else {
return -1;
}
}
void Http2Session::add_downstream_connection(Http2DownstreamConnection *dconn)
{
dconns_.insert(dconn);
}
void Http2Session::remove_downstream_connection
(Http2DownstreamConnection *dconn)
{
dconns_.erase(dconn);
dconn->detach_stream_data();
}
void Http2Session::remove_stream_data(StreamData *sd)
{
streams_.erase(sd);
if(sd->dconn) {
sd->dconn->detach_stream_data();
}
delete sd;
}
int Http2Session::submit_request(Http2DownstreamConnection *dconn,
int32_t pri,
const nghttp2_nv *nva, size_t nvlen,
const nghttp2_data_provider *data_prd)
{
assert(state_ == CONNECTED);
auto sd = util::make_unique<StreamData>();
// TODO Specify nullptr to pri_spec for now
int rv = nghttp2_submit_request(session_, nullptr, nva, nvlen,
data_prd, sd.get());
if(rv == 0) {
dconn->attach_stream_data(sd.get());
streams_.insert(sd.release());
} else {
SSLOG(FATAL, this) << "nghttp2_submit_request() failed: "
<< nghttp2_strerror(rv);
return -1;
}
return 0;
}
int Http2Session::submit_rst_stream(int32_t stream_id,
nghttp2_error_code error_code)
{
assert(state_ == 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;
}
int Http2Session::submit_window_update(Http2DownstreamConnection *dconn,
int32_t amount)
{
assert(state_ == CONNECTED);
int rv;
int32_t stream_id;
if(dconn) {
stream_id = dconn->get_downstream()->get_downstream_stream_id();
} else {
stream_id = 0;
}
rv = nghttp2_submit_window_update(session_, NGHTTP2_FLAG_NONE,
stream_id, amount);
if(rv < NGHTTP2_ERR_FATAL) {
SSLOG(FATAL, this) << "nghttp2_submit_window_update() failed: "
<< nghttp2_strerror(rv);
return -1;
}
return 0;
}
int Http2Session::submit_priority(Http2DownstreamConnection *dconn,
int32_t pri)
{
assert(state_ == CONNECTED);
if(!dconn) {
return 0;
}
int rv;
// TODO Disabled temporarily
// rv = nghttp2_submit_priority(session_, NGHTTP2_FLAG_NONE,
// dconn->get_downstream()->
// get_downstream_stream_id(), pri);
rv = 0;
if(rv < NGHTTP2_ERR_FATAL) {
SSLOG(FATAL, this) << "nghttp2_submit_priority() failed: "
<< nghttp2_strerror(rv);
return -1;
}
return 0;
}
nghttp2_session* Http2Session::get_session() const
{
return session_;
}
bool Http2Session::get_flow_control() const
{
return flow_control_;
}
int Http2Session::resume_data(Http2DownstreamConnection *dconn)
{
assert(state_ == 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) {
(upstream->get_downstream_readcb())
(http2session->get_bev(),
downstream->get_downstream_connection());
}
}
} // namespace
namespace {
int on_stream_close_callback
(nghttp2_session *session, int32_t stream_id, nghttp2_error_code error_code,
void *user_data)
{
int rv;
auto http2session = static_cast<Http2Session*>(user_data);
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "Stream stream_id=" << stream_id
<< " is being closed";
}
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();
if(downstream && downstream->get_downstream_stream_id() == stream_id) {
auto upstream = downstream->get_upstream();
if(error_code == NGHTTP2_NO_ERROR) {
downstream->set_response_state(Downstream::MSG_COMPLETE);
rv = upstream->on_downstream_body_complete(downstream);
if(rv != 0) {
downstream->set_response_state(Downstream::MSG_RESET);
}
} else {
downstream->set_response_state(Downstream::MSG_RESET);
}
call_downstream_readcb(http2session, downstream);
// dconn may be deleted
}
}
// The life time of StreamData ends here
http2session->remove_stream_data(sd);
return 0;
}
} // namespace
namespace {
void settings_timeout_cb(evutil_socket_t fd, short what, void *arg)
{
auto http2session = static_cast<Http2Session*>(arg);
SSLOG(INFO, http2session) << "SETTINGS timeout";
if(http2session->terminate_session(NGHTTP2_SETTINGS_TIMEOUT) != 0) {
http2session->disconnect();
return;
}
if(http2session->send() != 0) {
http2session->disconnect();
}
}
} // namespace
int Http2Session::start_settings_timer()
{
int rv;
// We submit SETTINGS only once
if(settings_timerev_) {
return 0;
}
settings_timerev_ = evtimer_new(evbase_, settings_timeout_cb, this);
if(settings_timerev_ == nullptr) {
return -1;
}
// SETTINGS ACK timeout is 10 seconds for now
timeval settings_timeout = { 10, 0 };
rv = evtimer_add(settings_timerev_, &settings_timeout);
if(rv == -1) {
return -1;
}
return 0;
}
void Http2Session::stop_settings_timer()
{
if(settings_timerev_ == nullptr) {
return;
}
event_free(settings_timerev_);
settings_timerev_ = nullptr;
}
namespace {
int on_header_callback(nghttp2_session *session,
const nghttp2_frame *frame,
const uint8_t *name, size_t namelen,
const uint8_t *value, size_t valuelen,
uint8_t flags,
void *user_data)
{
if(frame->hd.type != NGHTTP2_HEADERS ||
frame->headers.cat != NGHTTP2_HCAT_RESPONSE) {
return 0;
}
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(!downstream) {
return 0;
}
if(downstream->get_response_headers_sum() > Downstream::MAX_HEADERS_SUM) {
if(LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "Too large header block size="
<< downstream->get_response_headers_sum();
}
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
}
if(!http2::check_nv(name, namelen, value, valuelen)) {
return 0;
}
downstream->split_add_response_header(name, namelen, value, valuelen,
flags & NGHTTP2_NV_FLAG_NO_INDEX);
return 0;
}
} // namespace
namespace {
int on_begin_headers_callback(nghttp2_session *session,
const nghttp2_frame *frame,
void *user_data)
{
auto http2session = static_cast<Http2Session*>(user_data);
if(frame->headers.cat == NGHTTP2_HCAT_REQUEST) {
// server sends request HEADERS
http2session->submit_rst_stream(frame->hd.stream_id,
NGHTTP2_REFUSED_STREAM);
return 0;
}
if(frame->headers.cat != NGHTTP2_HCAT_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;
}
auto downstream = sd->dconn->get_downstream();
if(!downstream ||
downstream->get_downstream_stream_id() != frame->hd.stream_id) {
http2session->submit_rst_stream(frame->hd.stream_id,
NGHTTP2_INTERNAL_ERROR);
return 0;
}
return 0;
}
} // namespace
namespace {
int on_response_headers(Http2Session *http2session,
nghttp2_session *session,
const nghttp2_frame *frame)
{
int rv;
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(!downstream) {
return 0;
}
downstream->normalize_response_headers();
auto& nva = downstream->get_response_headers();
if(!http2::check_http2_headers(nva)) {
http2session->submit_rst_stream(frame->hd.stream_id,
NGHTTP2_PROTOCOL_ERROR);
downstream->set_response_state(Downstream::MSG_RESET);
call_downstream_readcb(http2session, downstream);
return 0;
}
auto status = http2::get_unique_header(nva, ":status");
if(!status || http2::value_lws(status)) {
http2session->submit_rst_stream(frame->hd.stream_id,
NGHTTP2_PROTOCOL_ERROR);
downstream->set_response_state(Downstream::MSG_RESET);
call_downstream_readcb(http2session, downstream);
return 0;
}
downstream->set_response_http_status(strtoul(status->value.c_str(),
nullptr, 10));
downstream->set_response_major(2);
downstream->set_response_minor(0);
auto content_length = http2::get_header(nva, "content-length");
if(!content_length && downstream->get_request_method() != "HEAD" &&
downstream->get_request_method() != "CONNECT") {
unsigned int status;
status = downstream->get_response_http_status();
if(!((100 <= status && status <= 199) || status == 204 ||
status == 304)) {
// Here we have response body but Content-Length is not known
// in advance.
if(downstream->get_request_major() <= 0 ||
downstream->get_request_minor() <= 0) {
// We simply close connection for pre-HTTP/1.1 in this case.
downstream->set_response_connection_close(true);
} else {
// Otherwise, use chunked encoding to keep upstream
// connection open. In HTTP2, we are supporsed not to
// receive transfer-encoding.
downstream->add_response_header("transfer-encoding", "chunked");
}
}
}
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();
}
auto upstream = downstream->get_upstream();
downstream->set_response_state(Downstream::HEADER_COMPLETE);
downstream->check_upgrade_fulfilled();
if(downstream->get_upgraded()) {
downstream->set_response_connection_close(true);
// On upgrade sucess, both ends can send data
if(upstream->resume_read(SHRPX_MSG_BLOCK, downstream) != 0) {
// If resume_read fails, just drop connection. Not ideal.
delete upstream->get_client_handler();
return 0;
}
downstream->set_request_state(Downstream::HEADER_COMPLETE);
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "HTTP upgrade success. stream_id="
<< frame->hd.stream_id;
}
} else if(downstream->get_request_method() == "CONNECT") {
// If request is CONNECT, terminate request body to avoid for
// stream to stall.
downstream->end_upload_data();
}
rv = upstream->on_downstream_header_complete(downstream);
if(rv != 0) {
http2session->submit_rst_stream(frame->hd.stream_id,
NGHTTP2_PROTOCOL_ERROR);
downstream->set_response_state(Downstream::MSG_RESET);
}
call_downstream_readcb(http2session, downstream);
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) {
break;
}
auto downstream = sd->dconn->get_downstream();
if(!downstream ||
downstream->get_downstream_stream_id() != frame->hd.stream_id) {
break;
}
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(Downstream::MSG_RESET);
}
call_downstream_readcb(http2session, downstream);
break;
}
case NGHTTP2_HEADERS:
return on_response_headers(http2session, session, frame);
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();
if(downstream &&
downstream->get_downstream_stream_id() == frame->hd.stream_id) {
if(downstream->get_upgraded() &&
downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
// For tunneled connection, we has to submit RST_STREAM to
// upstream *after* whole response body is sent. We just set
// MSG_COMPLETE here. Upstream will take care of that.
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "RST_STREAM against tunneled stream "
<< "stream_id="
<< frame->hd.stream_id;
}
downstream->get_upstream()->on_downstream_body_complete(downstream);
downstream->set_response_state(Downstream::MSG_COMPLETE);
} else {
// If we got RST_STREAM, just flag MSG_RESET to indicate
// upstream connection must be terminated.
downstream->set_response_state(Downstream::MSG_RESET);
}
downstream->set_response_rst_stream_error_code
(frame->rst_stream.error_code);
call_downstream_readcb(http2session, downstream);
}
}
break;
}
case NGHTTP2_SETTINGS:
if((frame->hd.flags & NGHTTP2_FLAG_ACK) == 0) {
break;
}
http2session->stop_settings_timer();
break;
case NGHTTP2_PUSH_PROMISE:
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session)
<< "Received downstream PUSH_PROMISE stream_id=" << frame->hd.stream_id
<< ", promised_stream_id=" << frame->push_promise.promised_stream_id;
}
// We just respond with RST_STREAM.
http2session->submit_rst_stream(frame->push_promise.promised_stream_id,
NGHTTP2_REFUSED_STREAM);
break;
default:
break;
}
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);
return 0;
}
auto downstream = sd->dconn->get_downstream();
if(!downstream || downstream->get_downstream_stream_id() != stream_id) {
http2session->submit_rst_stream(stream_id, NGHTTP2_INTERNAL_ERROR);
return 0;
}
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);
downstream->set_response_state(Downstream::MSG_RESET);
}
call_downstream_readcb(http2session, downstream);
return 0;
}
} // namespace
namespace {
int before_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_HEADERS &&
frame->headers.cat == NGHTTP2_HCAT_REQUEST) {
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_CANCEL);
return 0;
}
auto downstream = sd->dconn->get_downstream();
if(downstream) {
downstream->set_downstream_stream_id(frame->hd.stream_id);
} else {
http2session->submit_rst_stream(frame->hd.stream_id, NGHTTP2_CANCEL);
}
}
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_SETTINGS &&
(frame->hd.flags & NGHTTP2_FLAG_ACK) == 0) {
if(http2session->start_settings_timer() != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
}
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);
SSLOG(WARNING, 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 &&
frame->headers.cat == NGHTTP2_HCAT_REQUEST) {
// To avoid stream hanging around, flag Downstream::MSG_RESET and
// terminate the upstream and downstream connections.
auto sd = static_cast<StreamData*>
(nghttp2_session_get_stream_user_data(session, frame->hd.stream_id));
if(!sd) {
return 0;
}
if(sd->dconn) {
auto downstream = sd->dconn->get_downstream();
if(!downstream ||
downstream->get_downstream_stream_id() != frame->hd.stream_id) {
return 0;
}
downstream->set_response_state(Downstream::MSG_RESET);
call_downstream_readcb(http2session, downstream);
}
http2session->remove_stream_data(sd);
}
return 0;
}
} // namespace
namespace {
int on_unknown_frame_recv_callback(nghttp2_session *session,
const uint8_t *head, size_t headlen,
const uint8_t *payload, size_t payloadlen,
void *user_data)
{
auto http2session = static_cast<Http2Session*>(user_data);
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, http2session) << "Received unknown control frame";
}
return 0;
}
} // namespace
int Http2Session::on_connect()
{
int rv;
if(ssl_ctx_) {
const unsigned char *next_proto = nullptr;
unsigned int next_proto_len;
SSL_get0_next_proto_negotiated(ssl_, &next_proto, &next_proto_len);
for(int i = 0; i < 2; ++i) {
if(next_proto) {
if(LOG_ENABLED(INFO)) {
std::string proto(next_proto, next_proto+next_proto_len);
SSLOG(INFO, this) << "Negotiated next protocol: " << proto;
}
if(next_proto_len != NGHTTP2_PROTO_VERSION_ID_LEN ||
memcmp(NGHTTP2_PROTO_VERSION_ID, next_proto,
NGHTTP2_PROTO_VERSION_ID_LEN) != 0) {
return -1;
}
break;
}
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
SSL_get0_alpn_selected(ssl_, &next_proto, &next_proto_len);
#else // OPENSSL_VERSION_NUMBER < 0x10002000L
break;
#endif // OPENSSL_VERSION_NUMBER < 0x10002000L
}
if(!next_proto) {
return -1;
}
}
nghttp2_session_callbacks callbacks;
memset(&callbacks, 0, sizeof(callbacks));
callbacks.on_stream_close_callback = on_stream_close_callback;
callbacks.on_frame_recv_callback = on_frame_recv_callback;
callbacks.on_data_chunk_recv_callback = on_data_chunk_recv_callback;
callbacks.before_frame_send_callback = before_frame_send_callback;
callbacks.on_frame_send_callback = on_frame_send_callback;
callbacks.on_frame_not_send_callback = on_frame_not_send_callback;
callbacks.on_unknown_frame_recv_callback = on_unknown_frame_recv_callback;
callbacks.on_header_callback = on_header_callback;
callbacks.on_begin_headers_callback = on_begin_headers_callback;
if(get_config()->padding) {
callbacks.select_padding_callback = http::select_padding_callback;
}
rv = nghttp2_session_client_new2(&session_, &callbacks, this,
get_config()->http2_option);
if(rv != 0) {
return -1;
}
flow_control_ = true;
nghttp2_settings_entry entry[3];
entry[0].settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH;
entry[0].value = 0;
entry[1].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
entry[1].value = get_config()->http2_max_concurrent_streams;
entry[2].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
entry[2].value = (1 << get_config()->http2_downstream_window_bits) - 1;
rv = nghttp2_submit_settings(session_, NGHTTP2_FLAG_NONE, entry,
sizeof(entry)/sizeof(nghttp2_settings_entry));
if(rv != 0) {
return -1;
}
if(get_config()->http2_downstream_connection_window_bits > 16) {
int32_t delta =
(1 << get_config()->http2_downstream_connection_window_bits) - 1
- NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE;
rv = nghttp2_submit_window_update(session_, NGHTTP2_FLAG_NONE, 0, delta);
if(rv != 0) {
return -1;
}
}
rv = bufferevent_write(bev_, NGHTTP2_CLIENT_CONNECTION_PREFACE,
NGHTTP2_CLIENT_CONNECTION_PREFACE_LEN);
if(rv != 0) {
SSLOG(FATAL, this) << "bufferevent_write() failed";
return -1;
}
rv = send();
if(rv != 0) {
return -1;
}
// submit pending request
for(auto dconn : dconns_) {
if(dconn->push_request_headers() != 0) {
return -1;
}
}
return 0;
}
int Http2Session::on_read()
{
ssize_t rv = 0;
auto input = bufferevent_get_input(bev_);
auto inputlen = evbuffer_get_length(input);
auto mem = evbuffer_pullup(input, -1);
rv = nghttp2_session_mem_recv(session_, mem, inputlen);
if(rv < 0) {
SSLOG(ERROR, this) << "nghttp2_session_recv() returned error: "
<< nghttp2_strerror(rv);
return -1;
}
evbuffer_drain(input, rv);
return send();
}
int Http2Session::on_write()
{
return send();
}
int Http2Session::send()
{
int rv;
uint8_t buf[16384];
auto output = bufferevent_get_output(bev_);
util::EvbufferBuffer evbbuf(output, buf, sizeof(buf));
for(;;) {
// Check buffer length and return WOULDBLOCK if it is large enough.
if(evbuffer_get_length(output) + evbbuf.get_buflen() >
Http2Session::OUTBUF_MAX_THRES) {
return NGHTTP2_ERR_WOULDBLOCK;
}
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);
break;
}
if(datalen == 0) {
break;
}
rv = evbbuf.add(data, datalen);
if(rv != 0) {
SSLOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
}
rv = evbbuf.flush();
if(rv != 0) {
SSLOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
if(nghttp2_session_want_read(session_) == 0 &&
nghttp2_session_want_write(session_) == 0 &&
evbuffer_get_length(output) == 0) {
if(LOG_ENABLED(INFO)) {
SSLOG(INFO, this) << "No more read/write for this session";
}
return -1;
}
return 0;
}
void Http2Session::clear_notify()
{
auto input = bufferevent_get_output(rdbev_);
if(evbuffer_drain(input, evbuffer_get_length(input)) != 0) {
SSLOG(FATAL, this) << "evbuffer_drain() failed";
}
notified_ = false;
}
void Http2Session::notify()
{
if(!notified_) {
if(bufferevent_write(wrbev_, "1", 1) != 0) {
SSLOG(FATAL, this) << "bufferevent_write failed";
}
notified_ = true;
}
}
bufferevent* Http2Session::get_bev() const
{
return bev_;
}
int Http2Session::get_state() const
{
return state_;
}
void Http2Session::set_state(int state)
{
state_ = state;
}
int Http2Session::terminate_session(nghttp2_error_code error_code)
{
int rv;
rv = nghttp2_session_terminate_session(session_, error_code);
if(rv != 0) {
return -1;
}
return 0;
}
size_t Http2Session::get_outbuf_length() const
{
if(bev_) {
return evbuffer_get_length(bufferevent_get_output(bev_));
} else {
return OUTBUF_MAX_THRES;
}
}
} // namespace shrpx
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