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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_downstream_connection.h"
#include <unistd.h>
#include "http-parser/http_parser.h"
#include "shrpx_client_handler.h"
#include "shrpx_upstream.h"
#include "shrpx_downstream.h"
#include "shrpx_config.h"
#include "shrpx_error.h"
#include "shrpx_http.h"
#include "shrpx_http2_session.h"
#include "http2.h"
#include "util.h"
using namespace nghttp2;
namespace shrpx {
Http2DownstreamConnection::Http2DownstreamConnection(
DownstreamConnectionPool *dconn_pool, Http2Session *http2session)
: DownstreamConnection(dconn_pool), dlnext(nullptr), dlprev(nullptr),
http2session_(http2session), sd_(nullptr) {}
Http2DownstreamConnection::~Http2DownstreamConnection() {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Deleting";
}
if (downstream_) {
downstream_->disable_downstream_rtimer();
downstream_->disable_downstream_wtimer();
uint32_t error_code;
if (downstream_->get_request_state() == Downstream::STREAM_CLOSED &&
downstream_->get_upgraded()) {
// For upgraded connection, send NO_ERROR. Should we consider
// request states other than Downstream::STREAM_CLOSED ?
error_code = NGHTTP2_NO_ERROR;
} else {
error_code = NGHTTP2_INTERNAL_ERROR;
}
if (downstream_->get_downstream_stream_id() != -1) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Submit RST_STREAM for DOWNSTREAM:" << downstream_
<< ", stream_id="
<< downstream_->get_downstream_stream_id()
<< ", error_code=" << error_code;
}
submit_rst_stream(downstream_, error_code);
http2session_->consume(downstream_->get_downstream_stream_id(),
downstream_->get_response_datalen());
downstream_->reset_response_datalen();
http2session_->signal_write();
}
}
http2session_->remove_downstream_connection(this);
// Downstream and DownstreamConnection may be deleted
// asynchronously.
if (downstream_) {
downstream_->release_downstream_connection();
}
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Deleted";
}
}
int Http2DownstreamConnection::attach_downstream(Downstream *downstream) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Attaching to DOWNSTREAM:" << downstream;
}
http2session_->add_downstream_connection(this);
if (http2session_->get_state() == Http2Session::DISCONNECTED) {
http2session_->signal_write();
}
downstream_ = downstream;
downstream_->reset_downstream_rtimer();
return 0;
}
void Http2DownstreamConnection::detach_downstream(Downstream *downstream) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Detaching from DOWNSTREAM:" << downstream;
}
if (submit_rst_stream(downstream) == 0) {
http2session_->signal_write();
}
if (downstream_->get_downstream_stream_id() != -1) {
http2session_->consume(downstream_->get_downstream_stream_id(),
downstream_->get_response_datalen());
downstream_->reset_response_datalen();
http2session_->signal_write();
}
downstream->disable_downstream_rtimer();
downstream->disable_downstream_wtimer();
downstream_ = nullptr;
}
int Http2DownstreamConnection::submit_rst_stream(Downstream *downstream,
uint32_t error_code) {
int rv = -1;
if (http2session_->get_state() == Http2Session::CONNECTED &&
downstream->get_downstream_stream_id() != -1) {
switch (downstream->get_response_state()) {
case Downstream::MSG_RESET:
case Downstream::MSG_BAD_HEADER:
case Downstream::MSG_COMPLETE:
break;
default:
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Submit RST_STREAM for DOWNSTREAM:" << downstream
<< ", stream_id="
<< downstream->get_downstream_stream_id();
}
rv = http2session_->submit_rst_stream(
downstream->get_downstream_stream_id(), error_code);
}
}
return rv;
}
namespace {
ssize_t http2_data_read_callback(nghttp2_session *session, int32_t stream_id,
uint8_t *buf, size_t length,
uint32_t *data_flags,
nghttp2_data_source *source, void *user_data) {
int rv;
auto sd = static_cast<StreamData *>(
nghttp2_session_get_stream_user_data(session, stream_id));
if (!sd || !sd->dconn) {
return NGHTTP2_ERR_DEFERRED;
}
auto dconn = static_cast<Http2DownstreamConnection *>(source->ptr);
auto downstream = dconn->get_downstream();
if (!downstream) {
// In this case, RST_STREAM should have been issued. But depending
// on the priority, DATA frame may come first.
return NGHTTP2_ERR_DEFERRED;
}
auto input = downstream->get_request_buf();
auto nread = input->remove(buf, length);
auto input_empty = input->rleft() == 0;
if (nread > 0) {
// This is important because it will handle flow control
// stuff.
if (downstream->get_upstream()->resume_read(SHRPX_NO_BUFFER, downstream,
nread) != 0) {
// In this case, downstream may be deleted.
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
// Check dconn is still alive because Upstream::resume_read()
// may delete downstream which will delete dconn.
if (sd->dconn == nullptr) {
return NGHTTP2_ERR_DEFERRED;
}
}
if (input_empty &&
downstream->get_request_state() == Downstream::MSG_COMPLETE &&
// If connection is upgraded, don't set EOF flag, since HTTP/1
// will set MSG_COMPLETE to request state after upgrade response
// header is seen.
(!downstream->get_upgrade_request() ||
(downstream->get_response_state() == Downstream::HEADER_COMPLETE &&
!downstream->get_upgraded()))) {
*data_flags |= NGHTTP2_DATA_FLAG_EOF;
auto &trailers = downstream->get_request_trailers();
if (!trailers.empty()) {
std::vector<nghttp2_nv> nva;
nva.reserve(trailers.size());
http2::copy_headers_to_nva(nva, trailers);
if (!nva.empty()) {
rv = nghttp2_submit_trailer(session, stream_id, nva.data(), nva.size());
if (rv != 0) {
if (nghttp2_is_fatal(rv)) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
} else {
*data_flags |= NGHTTP2_DATA_FLAG_NO_END_STREAM;
}
}
}
}
if (!input_empty) {
downstream->reset_downstream_wtimer();
} else {
downstream->disable_downstream_wtimer();
}
if (nread == 0 && (*data_flags & NGHTTP2_DATA_FLAG_EOF) == 0) {
downstream->disable_downstream_wtimer();
return NGHTTP2_ERR_DEFERRED;
}
return nread;
}
} // namespace
int Http2DownstreamConnection::push_request_headers() {
int rv;
if (!downstream_) {
return 0;
}
if (!http2session_->can_push_request()) {
// The HTTP2 session to the backend has not been established or
// connection is now being checked. This function will be called
// again just after it is established.
downstream_->set_request_pending(true);
http2session_->start_checking_connection();
return 0;
}
downstream_->set_request_pending(false);
auto no_host_rewrite = get_config()->no_host_rewrite ||
get_config()->http2_proxy ||
get_config()->client_proxy ||
downstream_->get_request_method() == "CONNECT";
// http2session_ has already in CONNECTED state, so we can get
// addr_idx here.
auto addr_idx = http2session_->get_addr_idx();
auto downstream_hostport =
get_config()->downstream_addrs[addr_idx].hostport.get();
const char *authority = nullptr, *host = nullptr;
if (!no_host_rewrite) {
if (!downstream_->get_request_http2_authority().empty()) {
authority = downstream_hostport;
}
if (downstream_->get_request_header(http2::HD_HOST)) {
host = downstream_hostport;
}
} else {
if (!downstream_->get_request_http2_authority().empty()) {
authority = downstream_->get_request_http2_authority().c_str();
}
auto h = downstream_->get_request_header(http2::HD_HOST);
if (h) {
host = h->value.c_str();
}
}
if (!authority && !host) {
// upstream is HTTP/1.0. We use backend server's host
// nonetheless.
host = downstream_hostport;
}
if (authority) {
downstream_->set_request_downstream_host(authority);
} else {
downstream_->set_request_downstream_host(host);
}
size_t nheader = downstream_->get_request_headers().size();
Headers cookies;
if (!get_config()->http2_no_cookie_crumbling) {
cookies = downstream_->crumble_request_cookie();
}
// 8 means:
// 1. :method
// 2. :scheme
// 3. :path
// 4. :authority or host (at least either of them exists)
// 5. via (optional)
// 6. x-forwarded-for (optional)
// 7. x-forwarded-proto (optional)
// 8. te (optional)
auto nva = std::vector<nghttp2_nv>();
nva.reserve(nheader + 8 + cookies.size());
std::string via_value;
std::string xff_value;
std::string scheme, uri_authority, path, query;
nva.push_back(
http2::make_nv_ls(":method", downstream_->get_request_method()));
if (downstream_->get_request_method() == "CONNECT") {
if (authority) {
nva.push_back(http2::make_nv_lc(":authority", authority));
} else {
nva.push_back(
http2::make_nv_ls(":authority", downstream_->get_request_path()));
}
} else {
if (!downstream_->get_request_http2_scheme().empty()) {
nva.push_back(http2::make_nv_ls(":scheme",
downstream_->get_request_http2_scheme()));
} else if (client_handler_->get_ssl()) {
nva.push_back(http2::make_nv_ll(":scheme", "https"));
} else {
nva.push_back(http2::make_nv_ll(":scheme", "http"));
}
if (authority) {
nva.push_back(http2::make_nv_lc(":authority", authority));
}
nva.push_back(http2::make_nv_ls(":path", downstream_->get_request_path()));
}
// only emit host header field if :authority is not emitted. They
// both must be the same value.
if (!authority && host) {
nva.push_back(http2::make_nv_lc("host", host));
}
http2::copy_headers_to_nva(nva, downstream_->get_request_headers());
bool chunked_encoding = false;
auto transfer_encoding =
downstream_->get_request_header(http2::HD_TRANSFER_ENCODING);
if (transfer_encoding &&
util::strieq_l("chunked", (*transfer_encoding).value)) {
chunked_encoding = true;
}
for (auto &nv : cookies) {
nva.push_back(http2::make_nv(nv.name, nv.value, nv.no_index));
}
auto xff = downstream_->get_request_header(http2::HD_X_FORWARDED_FOR);
if (get_config()->add_x_forwarded_for) {
if (xff && !get_config()->strip_incoming_x_forwarded_for) {
xff_value = (*xff).value;
xff_value += ", ";
}
xff_value +=
downstream_->get_upstream()->get_client_handler()->get_ipaddr();
nva.push_back(http2::make_nv_ls("x-forwarded-for", xff_value));
} else if (xff && !get_config()->strip_incoming_x_forwarded_for) {
nva.push_back(http2::make_nv_ls("x-forwarded-for", (*xff).value));
}
if (!get_config()->http2_proxy && !get_config()->client_proxy &&
downstream_->get_request_method() != "CONNECT") {
// We use same protocol with :scheme header field
if (scheme.empty()) {
if (client_handler_->get_ssl()) {
nva.push_back(http2::make_nv_ll("x-forwarded-proto", "https"));
} else {
nva.push_back(http2::make_nv_ll("x-forwarded-proto", "http"));
}
} else {
nva.push_back(http2::make_nv_ls("x-forwarded-proto", scheme));
}
}
auto via = downstream_->get_request_header(http2::HD_VIA);
if (get_config()->no_via) {
if (via) {
nva.push_back(http2::make_nv_ls("via", (*via).value));
}
} else {
if (via) {
via_value = (*via).value;
via_value += ", ";
}
via_value += http::create_via_header_value(
downstream_->get_request_major(), downstream_->get_request_minor());
nva.push_back(http2::make_nv_ls("via", via_value));
}
auto te = downstream_->get_request_header(http2::HD_TE);
// HTTP/1 upstream request can contain keyword other than
// "trailers". We just forward "trailers".
// TODO more strict handling required here.
if (te && util::strifind(te->value.c_str(), "trailers")) {
nva.push_back(http2::make_nv_ll("te", "trailers"));
}
if (LOG_ENABLED(INFO)) {
std::stringstream ss;
for (auto &nv : nva) {
ss << TTY_HTTP_HD << nv.name << TTY_RST << ": " << nv.value << "\n";
}
DCLOG(INFO, this) << "HTTP request headers\n" << ss.str();
}
auto content_length =
downstream_->get_request_header(http2::HD_CONTENT_LENGTH);
// TODO check content-length: 0 case
if (downstream_->get_request_method() == "CONNECT" || chunked_encoding ||
content_length || downstream_->get_request_http2_expect_body()) {
// Request-body is expected.
nghttp2_data_provider data_prd;
data_prd.source.ptr = this;
data_prd.read_callback = http2_data_read_callback;
rv = http2session_->submit_request(this, downstream_->get_priority(),
nva.data(), nva.size(), &data_prd);
} else {
rv = http2session_->submit_request(this, downstream_->get_priority(),
nva.data(), nva.size(), nullptr);
}
if (rv != 0) {
DCLOG(FATAL, this) << "nghttp2_submit_request() failed";
return -1;
}
downstream_->reset_downstream_wtimer();
http2session_->signal_write();
return 0;
}
int Http2DownstreamConnection::push_upload_data_chunk(const uint8_t *data,
size_t datalen) {
int rv;
auto output = downstream_->get_request_buf();
output->append(data, datalen);
if (downstream_->get_downstream_stream_id() != -1) {
rv = http2session_->resume_data(this);
if (rv != 0) {
return -1;
}
downstream_->ensure_downstream_wtimer();
http2session_->signal_write();
}
return 0;
}
int Http2DownstreamConnection::end_upload_data() {
int rv;
if (downstream_->get_downstream_stream_id() != -1) {
rv = http2session_->resume_data(this);
if (rv != 0) {
return -1;
}
downstream_->ensure_downstream_wtimer();
http2session_->signal_write();
}
return 0;
}
int Http2DownstreamConnection::resume_read(IOCtrlReason reason,
size_t consumed) {
int rv;
if (http2session_->get_state() != Http2Session::CONNECTED ||
!http2session_->get_flow_control()) {
return 0;
}
if (!downstream_ || downstream_->get_downstream_stream_id() == -1) {
return 0;
}
if (consumed > 0) {
assert(downstream_->get_response_datalen() >= consumed);
rv = http2session_->consume(downstream_->get_downstream_stream_id(),
consumed);
if (rv != 0) {
return -1;
}
downstream_->dec_response_datalen(consumed);
http2session_->signal_write();
}
return 0;
}
int Http2DownstreamConnection::on_read() { return 0; }
int Http2DownstreamConnection::on_write() { return 0; }
void Http2DownstreamConnection::attach_stream_data(StreamData *sd) {
// It is possible sd->dconn is not NULL. sd is detached when
// on_stream_close_callback. Before that, after MSG_COMPLETE is set
// to Downstream::set_response_state(), upstream's readcb is called
// and execution path eventually could reach here. Since the
// response was already handled, we just detach sd.
detach_stream_data();
sd_ = sd;
sd_->dconn = this;
}
StreamData *Http2DownstreamConnection::detach_stream_data() {
if (sd_) {
auto sd = sd_;
sd_ = nullptr;
sd->dconn = nullptr;
return sd;
}
return nullptr;
}
int Http2DownstreamConnection::on_priority_change(int32_t pri) {
int rv;
if (downstream_->get_priority() == pri) {
return 0;
}
downstream_->set_priority(pri);
if (http2session_->get_state() != Http2Session::CONNECTED) {
return 0;
}
rv = http2session_->submit_priority(this, pri);
if (rv != 0) {
DLOG(FATAL, this) << "nghttp2_submit_priority() failed";
return -1;
}
http2session_->signal_write();
return 0;
}
int Http2DownstreamConnection::on_timeout() {
if (!downstream_) {
return 0;
}
return submit_rst_stream(downstream_, NGHTTP2_NO_ERROR);
}
} // namespace shrpx
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