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/*
* nghttp2 - HTTP/2.0 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 <openssl/err.h>
#include <event2/bufferevent_ssl.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
(ClientHandler *client_handler)
: DownstreamConnection(client_handler),
http2session_(client_handler->get_http2_session()),
request_body_buf_(nullptr),
sd_(nullptr)
{}
Http2DownstreamConnection::~Http2DownstreamConnection()
{
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Deleting";
}
if(request_body_buf_) {
evbuffer_free(request_body_buf_);
}
if(downstream_) {
if(submit_rst_stream(downstream_) == 0) {
http2session_->notify();
}
}
http2session_->remove_downstream_connection(this);
// Downstream and DownstreamConnection may be deleted
// asynchronously.
if(downstream_) {
downstream_->set_downstream_connection(nullptr);
}
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Deleted";
}
}
int Http2DownstreamConnection::init_request_body_buf()
{
int rv;
if(request_body_buf_) {
rv = evbuffer_drain(request_body_buf_,
evbuffer_get_length(request_body_buf_));
if(rv != 0) {
return -1;
}
} else {
request_body_buf_ = evbuffer_new();
if(request_body_buf_ == nullptr) {
return -1;
}
}
return 0;
}
int Http2DownstreamConnection::attach_downstream(Downstream *downstream)
{
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Attaching to DOWNSTREAM:" << downstream;
}
if(init_request_body_buf() == -1) {
return -1;
}
http2session_->add_downstream_connection(this);
if(http2session_->get_state() == Http2Session::DISCONNECTED) {
http2session_->notify();
}
downstream->set_downstream_connection(this);
downstream_ = downstream;
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_->notify();
}
downstream->set_downstream_connection(nullptr);
downstream_ = nullptr;
client_handler_->pool_downstream_connection(this);
}
int Http2DownstreamConnection::submit_rst_stream(Downstream *downstream)
{
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_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(),
NGHTTP2_INTERNAL_ERROR);
}
}
return rv;
}
namespace {
ssize_t http2_data_read_callback(nghttp2_session *session,
int32_t stream_id,
uint8_t *buf, size_t length,
int *eof,
nghttp2_data_source *source,
void *user_data)
{
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 body = dconn->get_request_body_buf();
int nread = 0;
for(;;) {
nread = evbuffer_remove(body, buf, length);
if(nread == -1) {
DCLOG(FATAL, dconn) << "evbuffer_remove() failed";
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
if(nread == 0) {
if(downstream->get_request_state() == Downstream::MSG_COMPLETE) {
if(!downstream->get_upgrade_request() ||
(downstream->get_response_state() == Downstream::HEADER_COMPLETE &&
!downstream->get_upgraded())) {
*eof = 1;
} else {
return NGHTTP2_ERR_DEFERRED;
}
break;
} else {
// This is important because it will handle flow control
// stuff.
if(downstream->get_upstream()->resume_read(SHRPX_NO_BUFFER,
downstream) != 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(evbuffer_get_length(body) == 0) {
// Check get_request_state() == MSG_COMPLETE just in case
if(downstream->get_request_state() == Downstream::MSG_COMPLETE) {
*eof = 1;
break;
}
return NGHTTP2_ERR_DEFERRED;
}
}
} else {
// Send WINDOW_UPDATE before buffer is empty to avoid delay
// because of RTT.
if(!downstream->get_output_buffer_full() &&
downstream->get_upstream()->resume_read(SHRPX_NO_BUFFER,
downstream) == -1) {
// In this case, downstream may be deleted.
return NGHTTP2_ERR_DEFERRED;
}
break;
}
}
return nread;
}
} // namespace
int Http2DownstreamConnection::push_request_headers()
{
int rv;
if(http2session_->get_state() != Http2Session::CONNECTED) {
// The HTTP2 session to the backend has not been established.
// This function will be called again just after it is
// established.
return 0;
}
if(!downstream_) {
return 0;
}
size_t nheader = downstream_->get_request_headers().size();
if(!get_config()->http2_no_cookie_crumbling) {
downstream_->crumble_request_cookie();
}
downstream_->normalize_request_headers();
downstream_->concat_norm_request_headers();
auto end_headers = std::end(downstream_->get_request_headers());
// 6 means:
// 1. :method
// 2. :scheme
// 3. :path
// 4. :authority (optional)
// 5. via (optional)
// 6. x-forwarded-for (optional)
auto nva = std::vector<nghttp2_nv>();
nva.reserve(nheader + 6);
std::string via_value;
std::string xff_value;
std::string scheme, authority, path, query;
// To reconstruct HTTP/1 status line and headers, proxy should
// preserve host header field. See draft-09 section 8.1.3.1.
if(downstream_->get_request_method() == "CONNECT") {
// The upstream may be HTTP/2 or HTTP/1
if(!downstream_->get_request_http2_authority().empty()) {
nva.push_back(http2::make_nv_ls
(":authority",
downstream_->get_request_http2_authority()));
} else {
nva.push_back(http2::make_nv_ls(":authority",
downstream_->get_request_path()));
}
} else if(!downstream_->get_request_http2_scheme().empty()) {
// Here the upstream is HTTP/2
nva.push_back(http2::make_nv_ls(":scheme",
downstream_->get_request_http2_scheme()));
nva.push_back(http2::make_nv_ls(":path",
downstream_->get_request_path()));
if(!downstream_->get_request_http2_authority().empty()) {
nva.push_back(http2::make_nv_ls
(":authority",
downstream_->get_request_http2_authority()));
} else if(downstream_->get_norm_request_header("host") == end_headers) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "host header field missing";
}
return -1;
}
} else {
// The upstream is HTTP/1
http_parser_url u;
const char *url = downstream_->get_request_path().c_str();
memset(&u, 0, sizeof(u));
rv = http_parser_parse_url(url,
downstream_->get_request_path().size(),
0, &u);
if(rv == 0) {
http2::copy_url_component(scheme, &u, UF_SCHEMA, url);
http2::copy_url_component(authority, &u, UF_HOST, url);
http2::copy_url_component(path, &u, UF_PATH, url);
http2::copy_url_component(query, &u, UF_QUERY, url);
if(path.empty()) {
path = "/";
}
if(!query.empty()) {
path += "?";
path += query;
}
}
if(scheme.empty()) {
// The default scheme is http. For HTTP2 upstream, the path must
// be absolute URI, so scheme should be provided.
nva.push_back(http2::make_nv_ll(":scheme", "http"));
} else {
nva.push_back(http2::make_nv_ls(":scheme", scheme));
}
if(path.empty()) {
nva.push_back(http2::make_nv_ls(":path",
downstream_->get_request_path()));
} else {
nva.push_back(http2::make_nv_ls(":path", path));
}
if(!authority.empty()) {
// TODO properly check IPv6 numeric address
if(authority.find(":") != std::string::npos) {
authority = "[" + authority;
authority += "]";
}
if(u.field_set & (1 << UF_PORT)) {
authority += ":";
authority += util::utos(u.port);
}
nva.push_back(http2::make_nv_ls(":authority", authority));
} else if(downstream_->get_norm_request_header("host") == end_headers) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "host header field missing";
}
return -1;
}
}
nva.push_back(http2::make_nv_ls(":method",
downstream_->get_request_method()));
http2::copy_norm_headers_to_nva(nva, downstream_->get_request_headers());
bool content_length = false;
if(downstream_->get_norm_request_header("content-length") != end_headers) {
content_length = true;
}
bool chunked_encoding = false;
auto transfer_encoding =
downstream_->get_norm_request_header("transfer-encoding");
if(transfer_encoding != end_headers &&
util::strieq((*transfer_encoding).second.c_str(), "chunked")) {
chunked_encoding = true;
}
auto xff = downstream_->get_norm_request_header("x-forwarded-for");
if(get_config()->add_x_forwarded_for) {
if(xff != end_headers) {
xff_value = (*xff).second;
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 != end_headers) {
nva.push_back(http2::make_nv_ls("x-forwarded-for", (*xff).second));
}
auto via = downstream_->get_norm_request_header("via");
if(get_config()->no_via) {
if(via != end_headers) {
nva.push_back(http2::make_nv_ls("via", (*via).second));
}
} else {
if(via != end_headers) {
via_value = (*via).second;
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));
}
if(LOG_ENABLED(INFO)) {
std::stringstream ss;
for(auto& nv : nva) {
ss << TTY_HTTP_HD;
ss.write(reinterpret_cast<const char*>(nv.name), nv.namelen);
ss << TTY_RST << ": ";
ss.write(reinterpret_cast<const char*>(nv.value), nv.valuelen);
ss << "\n";
}
DCLOG(INFO, this) << "HTTP request headers\n" << ss.str();
}
if(downstream_->get_request_method() == "CONNECT" ||
chunked_encoding || content_length) {
// 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_priorty(),
nva.data(), nva.size(), &data_prd);
} else {
rv = http2session_->submit_request(this, downstream_->get_priorty(),
nva.data(), nva.size(), nullptr);
}
if(rv != 0) {
DCLOG(FATAL, this) << "nghttp2_submit_request() failed";
return -1;
}
http2session_->notify();
return 0;
}
int Http2DownstreamConnection::push_upload_data_chunk(const uint8_t *data,
size_t datalen)
{
int rv = evbuffer_add(request_body_buf_, data, datalen);
if(rv != 0) {
DCLOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
if(downstream_->get_downstream_stream_id() != -1) {
rv = http2session_->resume_data(this);
if(rv != 0) {
return -1;
}
http2session_->notify();
}
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;
}
http2session_->notify();
}
return 0;
}
int Http2DownstreamConnection::resume_read(IOCtrlReason reason)
{
int rv1 = 0, rv2 = 0;
if(http2session_->get_state() == Http2Session::CONNECTED &&
http2session_->get_flow_control()) {
int32_t window_size_increment;
window_size_increment = http2::determine_window_update_transmission
(http2session_->get_session(), 0);
if(window_size_increment != -1) {
rv1 = http2session_->submit_window_update(nullptr, window_size_increment);
if(rv1 == 0) {
http2session_->notify();
}
}
if(downstream_ && downstream_->get_downstream_stream_id() != -1) {
window_size_increment = http2::determine_window_update_transmission
(http2session_->get_session(), downstream_->get_downstream_stream_id());
if(window_size_increment != -1) {
rv2 = http2session_->submit_window_update(this, window_size_increment);
if(rv2 == 0) {
http2session_->notify();
}
}
}
}
if(rv1 == 0 && rv2 == 0) {
return 0;
}
DLOG(WARNING, this) << "Sending WINDOW_UPDATE failed";
return -1;
}
int Http2DownstreamConnection::on_read()
{
return 0;
}
int Http2DownstreamConnection::on_write()
{
return 0;
}
evbuffer* Http2DownstreamConnection::get_request_body_buf() const
{
return request_body_buf_;
}
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;
} else {
return nullptr;
}
}
bool Http2DownstreamConnection::get_output_buffer_full()
{
if(request_body_buf_) {
return http2session_->get_outbuf_length() +
evbuffer_get_length(request_body_buf_) >= Http2Session::OUTBUF_MAX_THRES;
} else {
return false;
}
}
int Http2DownstreamConnection::on_priority_change(int32_t pri)
{
int rv;
if(downstream_->get_priorty() == 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_->notify();
return 0;
}
} // namespace shrpx
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