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nghttp2/src/shrpx_client_handler.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_client_handler.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif // HAVE_UNISTD_H
#include <cerrno>
#include "shrpx_upstream.h"
#include "shrpx_http2_upstream.h"
#include "shrpx_https_upstream.h"
#include "shrpx_config.h"
#include "shrpx_http_downstream_connection.h"
#include "shrpx_http2_downstream_connection.h"
#include "shrpx_ssl.h"
#include "shrpx_worker.h"
#include "shrpx_downstream_connection_pool.h"
#include "shrpx_downstream.h"
#include "shrpx_http2_session.h"
#ifdef HAVE_SPDYLAY
#include "shrpx_spdy_upstream.h"
#endif // HAVE_SPDYLAY
#include "util.h"
#include "template.h"
#include "ssl.h"
using namespace nghttp2;
namespace shrpx {
namespace {
void timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto handler = static_cast<ClientHandler *>(conn->data);
if (LOG_ENABLED(INFO)) {
CLOG(INFO, handler) << "Time out";
}
delete handler;
}
} // namespace
namespace {
void shutdowncb(struct ev_loop *loop, ev_timer *w, int revents) {
auto handler = static_cast<ClientHandler *>(w->data);
if (LOG_ENABLED(INFO)) {
CLOG(INFO, handler) << "Close connection due to TLS renegotiation";
}
delete handler;
}
} // namespace
namespace {
void readcb(struct ev_loop *loop, ev_io *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto handler = static_cast<ClientHandler *>(conn->data);
if (handler->do_read() != 0) {
delete handler;
return;
}
if (handler->do_write() != 0) {
delete handler;
return;
}
}
} // namespace
namespace {
void writecb(struct ev_loop *loop, ev_io *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto handler = static_cast<ClientHandler *>(conn->data);
if (handler->do_write() != 0) {
delete handler;
return;
}
}
} // namespace
int ClientHandler::read_clear() {
ev_timer_again(conn_.loop, &conn_.rt);
for (;;) {
if (rb_.rleft() && on_read() != 0) {
return -1;
}
if (rb_.rleft() == 0) {
rb_.reset();
} else if (rb_.wleft() == 0) {
conn_.rlimit.stopw();
return 0;
}
auto nread = conn_.read_clear(rb_.last, rb_.wleft());
if (nread == 0) {
return 0;
}
if (nread < 0) {
return -1;
}
rb_.write(nread);
}
}
int ClientHandler::write_clear() {
ev_timer_again(conn_.loop, &conn_.rt);
for (;;) {
if (wb_.rleft() > 0) {
auto nwrite = conn_.write_clear(wb_.pos, wb_.rleft());
if (nwrite == 0) {
return 0;
}
if (nwrite < 0) {
return -1;
}
wb_.drain(nwrite);
continue;
}
wb_.reset();
if (on_write() != 0) {
return -1;
}
if (wb_.rleft() == 0) {
break;
}
}
conn_.wlimit.stopw();
ev_timer_stop(conn_.loop, &conn_.wt);
return 0;
}
int ClientHandler::tls_handshake() {
ev_timer_again(conn_.loop, &conn_.rt);
ERR_clear_error();
auto rv = conn_.tls_handshake();
if (rv == SHRPX_ERR_INPROGRESS) {
return 0;
}
if (rv < 0) {
return -1;
}
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "SSL/TLS handshake completed";
}
if (validate_next_proto() != 0) {
return -1;
}
read_ = &ClientHandler::read_tls;
write_ = &ClientHandler::write_tls;
return 0;
}
int ClientHandler::read_tls() {
ev_timer_again(conn_.loop, &conn_.rt);
ERR_clear_error();
for (;;) {
// we should process buffered data first before we read EOF.
if (rb_.rleft() && on_read() != 0) {
return -1;
}
if (rb_.rleft() == 0) {
rb_.reset();
} else if (rb_.wleft() == 0) {
conn_.rlimit.stopw();
return 0;
}
auto nread = conn_.read_tls(rb_.last, rb_.wleft());
if (nread == 0) {
return 0;
}
if (nread < 0) {
return -1;
}
rb_.write(nread);
}
}
int ClientHandler::write_tls() {
ev_timer_again(conn_.loop, &conn_.rt);
ERR_clear_error();
for (;;) {
if (wb_.rleft() > 0) {
auto nwrite = conn_.write_tls(wb_.pos, wb_.rleft());
if (nwrite == 0) {
return 0;
}
if (nwrite < 0) {
return -1;
}
wb_.drain(nwrite);
continue;
}
wb_.reset();
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 ClientHandler::upstream_noop() { return 0; }
int ClientHandler::upstream_read() {
assert(upstream_);
if (upstream_->on_read() != 0) {
return -1;
}
return 0;
}
int ClientHandler::upstream_write() {
assert(upstream_);
if (upstream_->on_write() != 0) {
return -1;
}
if (get_should_close_after_write() && wb_.rleft() == 0) {
return -1;
}
return 0;
}
int ClientHandler::upstream_http2_connhd_read() {
auto nread = std::min(left_connhd_len_, rb_.rleft());
if (memcmp(NGHTTP2_CLIENT_MAGIC + NGHTTP2_CLIENT_MAGIC_LEN - left_connhd_len_,
rb_.pos, nread) != 0) {
// There is no downgrade path here. Just drop the connection.
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "invalid client connection header";
}
return -1;
}
left_connhd_len_ -= nread;
rb_.drain(nread);
conn_.rlimit.startw();
if (left_connhd_len_ == 0) {
on_read_ = &ClientHandler::upstream_read;
// Run on_read to process data left in buffer since they are not
// notified further
if (on_read() != 0) {
return -1;
}
return 0;
}
return 0;
}
int ClientHandler::upstream_http1_connhd_read() {
auto nread = std::min(left_connhd_len_, rb_.rleft());
if (memcmp(NGHTTP2_CLIENT_MAGIC + NGHTTP2_CLIENT_MAGIC_LEN - left_connhd_len_,
rb_.pos, nread) != 0) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "This is HTTP/1.1 connection, "
<< "but may be upgraded to HTTP/2 later.";
}
// Reset header length for later HTTP/2 upgrade
left_connhd_len_ = NGHTTP2_CLIENT_MAGIC_LEN;
on_read_ = &ClientHandler::upstream_read;
on_write_ = &ClientHandler::upstream_write;
if (on_read() != 0) {
return -1;
}
return 0;
}
left_connhd_len_ -= nread;
rb_.drain(nread);
conn_.rlimit.startw();
if (left_connhd_len_ == 0) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "direct HTTP/2 connection";
}
direct_http2_upgrade();
on_read_ = &ClientHandler::upstream_read;
on_write_ = &ClientHandler::upstream_write;
// Run on_read to process data left in buffer since they are not
// notified further
if (on_read() != 0) {
return -1;
}
return 0;
}
return 0;
}
ClientHandler::ClientHandler(Worker *worker, int fd, SSL *ssl,
const char *ipaddr, const char *port)
: conn_(worker->get_loop(), fd, ssl, worker->get_mcpool(),
get_config()->upstream_write_timeout,
get_config()->upstream_read_timeout, get_config()->write_rate,
get_config()->write_burst, get_config()->read_rate,
get_config()->read_burst, writecb, readcb, timeoutcb, this),
pinned_http2sessions_(
get_config()->downstream_proto == PROTO_HTTP2
? make_unique<std::vector<ssize_t>>(
get_config()->downstream_addr_groups.size(), -1)
: nullptr),
ipaddr_(ipaddr), port_(port), worker_(worker),
left_connhd_len_(NGHTTP2_CLIENT_MAGIC_LEN),
should_close_after_write_(false) {
++worker_->get_worker_stat()->num_connections;
ev_timer_init(&reneg_shutdown_timer_, shutdowncb, 0., 0.);
reneg_shutdown_timer_.data = this;
conn_.rlimit.startw();
ev_timer_again(conn_.loop, &conn_.rt);
if (conn_.tls.ssl) {
conn_.prepare_server_handshake();
read_ = write_ = &ClientHandler::tls_handshake;
on_read_ = &ClientHandler::upstream_noop;
on_write_ = &ClientHandler::upstream_write;
} else {
// For non-TLS version, first create HttpsUpstream. It may be
// upgraded to HTTP/2 through HTTP Upgrade or direct HTTP/2
// connection.
upstream_ = make_unique<HttpsUpstream>(this);
alpn_ = "http/1.1";
read_ = &ClientHandler::read_clear;
write_ = &ClientHandler::write_clear;
on_read_ = &ClientHandler::upstream_http1_connhd_read;
on_write_ = &ClientHandler::upstream_noop;
}
}
ClientHandler::~ClientHandler() {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Deleting";
}
if (upstream_) {
upstream_->on_handler_delete();
}
auto worker_stat = worker_->get_worker_stat();
--worker_stat->num_connections;
if (worker_stat->num_connections == 0) {
worker_->schedule_clear_mcpool();
}
ev_timer_stop(conn_.loop, &reneg_shutdown_timer_);
// TODO If backend is http/2, and it is in CONNECTED state, signal
// it and make it loopbreak when output is zero.
if (worker_->get_graceful_shutdown() && worker_stat->num_connections == 0) {
ev_break(conn_.loop);
}
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Deleted";
}
}
Upstream *ClientHandler::get_upstream() { return upstream_.get(); }
struct ev_loop *ClientHandler::get_loop() const {
return conn_.loop;
}
void ClientHandler::reset_upstream_read_timeout(ev_tstamp t) {
conn_.rt.repeat = t;
if (ev_is_active(&conn_.rt)) {
ev_timer_again(conn_.loop, &conn_.rt);
}
}
void ClientHandler::reset_upstream_write_timeout(ev_tstamp t) {
conn_.wt.repeat = t;
if (ev_is_active(&conn_.wt)) {
ev_timer_again(conn_.loop, &conn_.wt);
}
}
int ClientHandler::validate_next_proto() {
const unsigned char *next_proto = nullptr;
unsigned int next_proto_len;
// First set callback for catch all cases
on_read_ = &ClientHandler::upstream_read;
SSL_get0_next_proto_negotiated(conn_.tls.ssl, &next_proto, &next_proto_len);
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
if (next_proto == nullptr) {
SSL_get0_alpn_selected(conn_.tls.ssl, &next_proto, &next_proto_len);
}
#endif // OPENSSL_VERSION_NUMBER >= 0x10002000L
if (next_proto == nullptr) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "No protocol negotiated. Fallback to HTTP/1.1";
}
upstream_ = make_unique<HttpsUpstream>(this);
alpn_ = "http/1.1";
// At this point, input buffer is already filled with some bytes.
// The read callback is not called until new data come. So consume
// input buffer here.
if (on_read() != 0) {
return -1;
}
return 0;
}
if (LOG_ENABLED(INFO)) {
std::string proto(next_proto, next_proto + next_proto_len);
CLOG(INFO, this) << "The negotiated next protocol: " << proto;
}
if (!ssl::in_proto_list(get_config()->npn_list, next_proto, next_proto_len)) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "The negotiated protocol is not supported";
}
return -1;
}
if (util::check_h2_is_selected(next_proto, next_proto_len)) {
on_read_ = &ClientHandler::upstream_http2_connhd_read;
auto http2_upstream = make_unique<Http2Upstream>(this);
upstream_ = std::move(http2_upstream);
alpn_.assign(next_proto, next_proto + next_proto_len);
// At this point, input buffer is already filled with some bytes.
// The read callback is not called until new data come. So consume
// input buffer here.
if (on_read() != 0) {
return -1;
}
return 0;
}
#ifdef HAVE_SPDYLAY
auto spdy_version = spdylay_npn_get_version(next_proto, next_proto_len);
if (spdy_version) {
upstream_ = make_unique<SpdyUpstream>(spdy_version, this);
switch (spdy_version) {
case SPDYLAY_PROTO_SPDY2:
alpn_ = "spdy/2";
break;
case SPDYLAY_PROTO_SPDY3:
alpn_ = "spdy/3";
break;
case SPDYLAY_PROTO_SPDY3_1:
alpn_ = "spdy/3.1";
break;
default:
alpn_ = "spdy/unknown";
}
// At this point, input buffer is already filled with some bytes.
// The read callback is not called until new data come. So consume
// input buffer here.
if (on_read() != 0) {
return -1;
}
return 0;
}
#endif // HAVE_SPDYLAY
if (next_proto_len == 8 && memcmp("http/1.1", next_proto, 8) == 0) {
upstream_ = make_unique<HttpsUpstream>(this);
alpn_ = "http/1.1";
// At this point, input buffer is already filled with some bytes.
// The read callback is not called until new data come. So consume
// input buffer here.
if (on_read() != 0) {
return -1;
}
return 0;
}
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "The negotiated protocol is not supported";
}
return -1;
}
int ClientHandler::do_read() { return read_(*this); }
int ClientHandler::do_write() { return write_(*this); }
int ClientHandler::on_read() {
auto rv = on_read_(*this);
if (rv != 0) {
return rv;
}
conn_.handle_tls_pending_read();
return 0;
}
int ClientHandler::on_write() { return on_write_(*this); }
const std::string &ClientHandler::get_ipaddr() const { return ipaddr_; }
bool ClientHandler::get_should_close_after_write() const {
return should_close_after_write_;
}
void ClientHandler::set_should_close_after_write(bool f) {
should_close_after_write_ = f;
}
void ClientHandler::pool_downstream_connection(
std::unique_ptr<DownstreamConnection> dconn) {
if (!dconn->poolable()) {
return;
}
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Pooling downstream connection DCONN:" << dconn.get()
<< " in group " << dconn->get_group();
}
dconn->set_client_handler(nullptr);
auto dconn_pool = worker_->get_dconn_pool();
dconn_pool->add_downstream_connection(std::move(dconn));
}
void ClientHandler::remove_downstream_connection(DownstreamConnection *dconn) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Removing downstream connection DCONN:" << dconn
<< " from pool";
}
auto dconn_pool = worker_->get_dconn_pool();
dconn_pool->remove_downstream_connection(dconn);
}
std::unique_ptr<DownstreamConnection>
ClientHandler::get_downstream_connection(Downstream *downstream) {
size_t group;
auto &groups = get_config()->downstream_addr_groups;
auto catch_all = get_config()->downstream_addr_group_catch_all;
// Fast path. If we have one group, it must be catch-all group.
// HTTP/2 and client proxy modes fall in this case.
if (groups.size() == 1) {
group = 0;
} else if (downstream->get_request_method() == HTTP_CONNECT) {
// We don't know how to treat CONNECT request in host-path
// mapping. It most likely appears in proxy scenario. Since we
// have dealt with proxy case already, just use catch-all group.
group = catch_all;
} else {
if (!downstream->get_request_http2_authority().empty()) {
group = match_downstream_addr_group(
downstream->get_request_http2_authority(),
downstream->get_request_path(), groups, catch_all);
} else {
auto h = downstream->get_request_header(http2::HD_HOST);
if (h) {
group = match_downstream_addr_group(
h->value, downstream->get_request_path(), groups, catch_all);
} else {
group = match_downstream_addr_group("", downstream->get_request_path(),
groups, catch_all);
}
}
}
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Downstream address group: " << group;
}
auto dconn_pool = worker_->get_dconn_pool();
auto dconn = dconn_pool->pop_downstream_connection(group);
if (!dconn) {
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Downstream connection pool is empty."
<< " Create new one";
}
auto dconn_pool = worker_->get_dconn_pool();
if (get_config()->downstream_proto == PROTO_HTTP2) {
Http2Session *http2session;
auto &pinned = (*pinned_http2sessions_)[group];
if (pinned == -1) {
http2session = worker_->next_http2_session(group);
pinned = http2session->get_index();
} else {
auto dgrp = worker_->get_dgrp(group);
http2session = dgrp->http2sessions[pinned].get();
}
dconn = make_unique<Http2DownstreamConnection>(dconn_pool, http2session);
} else {
dconn =
make_unique<HttpDownstreamConnection>(dconn_pool, group, conn_.loop);
}
dconn->set_client_handler(this);
return dconn;
}
dconn->set_client_handler(this);
if (LOG_ENABLED(INFO)) {
CLOG(INFO, this) << "Reuse downstream connection DCONN:" << dconn.get()
<< " from pool";
}
return dconn;
}
MemchunkPool *ClientHandler::get_mcpool() { return worker_->get_mcpool(); }
SSL *ClientHandler::get_ssl() const { return conn_.tls.ssl; }
ConnectBlocker *ClientHandler::get_connect_blocker() const {
return worker_->get_connect_blocker();
}
void ClientHandler::direct_http2_upgrade() {
upstream_ = make_unique<Http2Upstream>(this);
alpn_ = NGHTTP2_CLEARTEXT_PROTO_VERSION_ID;
on_read_ = &ClientHandler::upstream_read;
}
int ClientHandler::perform_http2_upgrade(HttpsUpstream *http) {
auto upstream = make_unique<Http2Upstream>(this);
if (upstream->upgrade_upstream(http) != 0) {
return -1;
}
// http pointer is now owned by upstream.
upstream_.release();
upstream_ = std::move(upstream);
// TODO We might get other version id in HTTP2-settings, if we
// support aliasing for h2, but we just use library default for now.
alpn_ = NGHTTP2_CLEARTEXT_PROTO_VERSION_ID;
on_read_ = &ClientHandler::upstream_http2_connhd_read;
static char res[] = "HTTP/1.1 101 Switching Protocols\r\n"
"Connection: Upgrade\r\n"
"Upgrade: " NGHTTP2_CLEARTEXT_PROTO_VERSION_ID "\r\n"
"\r\n";
wb_.write(res, sizeof(res) - 1);
signal_write();
return 0;
}
bool ClientHandler::get_http2_upgrade_allowed() const { return !conn_.tls.ssl; }
std::string ClientHandler::get_upstream_scheme() const {
if (conn_.tls.ssl) {
return "https";
} else {
return "http";
}
}
void ClientHandler::start_immediate_shutdown() {
ev_timer_start(conn_.loop, &reneg_shutdown_timer_);
}
namespace {
// Construct absolute request URI from |downstream|, mainly to log
// request URI for proxy request (HTTP/2 proxy or client proxy). This
// is mostly same routine found in
// HttpDownstreamConnection::push_request_headers(), but vastly
// simplified since we only care about absolute URI.
std::string construct_absolute_request_uri(Downstream *downstream) {
auto &authority = downstream->get_request_http2_authority();
if (authority.empty()) {
return downstream->get_request_path();
}
std::string uri;
auto &scheme = downstream->get_request_http2_scheme();
if (scheme.empty()) {
// We may have to log the request which lacks scheme (e.g.,
// http/1.1 with origin form).
uri += "http://";
} else {
uri += scheme;
uri += "://";
}
uri += authority;
uri += downstream->get_request_path();
return uri;
}
} // namespace
void ClientHandler::write_accesslog(Downstream *downstream) {
nghttp2::ssl::TLSSessionInfo tls_info;
upstream_accesslog(
get_config()->accesslog_format,
LogSpec{
downstream, ipaddr_.c_str(),
http2::to_method_string(downstream->get_request_method()),
downstream->get_request_method() == HTTP_CONNECT
? downstream->get_request_http2_authority().c_str()
: (get_config()->http2_proxy || get_config()->client_proxy)
? construct_absolute_request_uri(downstream).c_str()
: downstream->get_request_path().empty()
? downstream->get_request_method() == HTTP_OPTIONS
? "*"
: "-"
: downstream->get_request_path().c_str(),
alpn_.c_str(),
nghttp2::ssl::get_tls_session_info(&tls_info, conn_.tls.ssl),
std::chrono::system_clock::now(), // time_now
downstream->get_request_start_time(), // request_start_time
std::chrono::high_resolution_clock::now(), // request_end_time
downstream->get_request_major(), downstream->get_request_minor(),
downstream->get_response_http_status(),
downstream->get_response_sent_bodylen(), port_.c_str(),
get_config()->port, get_config()->pid,
});
}
void ClientHandler::write_accesslog(int major, int minor, unsigned int status,
int64_t body_bytes_sent) {
auto time_now = std::chrono::system_clock::now();
auto highres_now = std::chrono::high_resolution_clock::now();
nghttp2::ssl::TLSSessionInfo tls_info;
upstream_accesslog(get_config()->accesslog_format,
LogSpec{
nullptr, ipaddr_.c_str(),
"-", // method
"-", // path,
alpn_.c_str(), nghttp2::ssl::get_tls_session_info(
&tls_info, conn_.tls.ssl),
time_now,
highres_now, // request_start_time TODO is
// there a better value?
highres_now, // request_end_time
major, minor, // major, minor
status, body_bytes_sent, port_.c_str(),
get_config()->port, get_config()->pid,
});
}
ClientHandler::WriteBuf *ClientHandler::get_wb() { return &wb_; }
ClientHandler::ReadBuf *ClientHandler::get_rb() { return &rb_; }
void ClientHandler::signal_write() { conn_.wlimit.startw(); }
RateLimit *ClientHandler::get_rlimit() { return &conn_.rlimit; }
RateLimit *ClientHandler::get_wlimit() { return &conn_.wlimit; }
ev_io *ClientHandler::get_wev() { return &conn_.wev; }
Worker *ClientHandler::get_worker() const { return worker_; }
} // namespace shrpx
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