440 lines
12 KiB
C++
440 lines
12 KiB
C++
/*
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* Spdylay - SPDY Library
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*
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* Copyright (c) 2012 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "shrpx_downstream.h"
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#include <cassert>
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#include "shrpx_upstream.h"
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#include "shrpx_client_handler.h"
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#include "shrpx_config.h"
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#include "shrpx_error.h"
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#include "util.h"
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using namespace spdylay;
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namespace shrpx {
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Downstream::Downstream(Upstream *upstream, int stream_id, int priority)
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: upstream_(upstream),
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bev_(0),
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stream_id_(stream_id),
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priority_(priority),
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ioctrl_(0),
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request_state_(INITIAL),
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chunked_request_(false),
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request_connection_close_(false),
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response_state_(INITIAL),
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response_http_status_(0),
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chunked_response_(false),
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response_htp_(htparser_new()),
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response_body_buf_(0)
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{
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htparser_init(response_htp_, htp_type_response);
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htparser_set_userdata(response_htp_, this);
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event_base *evbase = upstream_->get_client_handler()->get_evbase();
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bev_ = bufferevent_socket_new
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(evbase, -1,
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BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS);
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ioctrl_.set_bev(bev_);
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}
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Downstream::~Downstream()
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{
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if(ENABLE_LOG) {
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LOG(INFO) << "Deleting downstream " << this;
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}
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if(response_body_buf_) {
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// Passing NULL to evbuffer_free() causes segmentation fault.
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evbuffer_free(response_body_buf_);
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}
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bufferevent_disable(bev_, EV_READ | EV_WRITE);
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bufferevent_free(bev_);
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free(response_htp_);
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if(ENABLE_LOG) {
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LOG(INFO) << "Deleted";
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}
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}
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void Downstream::pause_read(IOCtrlReason reason)
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{
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ioctrl_.pause_read(reason);
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}
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bool Downstream::resume_read(IOCtrlReason reason)
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{
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return ioctrl_.resume_read(reason);
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}
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namespace {
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void check_transfer_encoding_chunked(bool *chunked,
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const Headers::value_type &item)
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{
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if(util::strieq(item.first.c_str(), "transfer-encoding")) {
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if(util::strifind(item.second.c_str(), "chunked")) {
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*chunked = true;
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}
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}
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}
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} // namespace
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namespace {
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void check_request_connection(bool *connection_close,
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const Headers::value_type &item)
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{
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if(util::strieq(item.first.c_str(), "connection")) {
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if(util::strifind(item.second.c_str(), "close")) {
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*connection_close = true;
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}
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}
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}
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} // namespace
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void Downstream::add_request_header(const std::string& name,
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const std::string& value)
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{
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request_headers_.push_back(std::make_pair(name, value));
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}
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void Downstream::set_last_request_header_value(const std::string& value)
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{
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Headers::value_type &item = request_headers_.back();
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item.second = value;
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check_transfer_encoding_chunked(&chunked_request_, item);
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check_request_connection(&request_connection_close_, item);
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}
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void Downstream::set_request_method(const std::string& method)
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{
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request_method_ = method;
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}
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void Downstream::set_request_path(const std::string& path)
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{
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request_path_ = path;
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}
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Upstream* Downstream::get_upstream() const
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{
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return upstream_;
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}
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int32_t Downstream::get_stream_id() const
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{
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return stream_id_;
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}
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int Downstream::start_connection()
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{
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bufferevent_setcb(bev_,
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upstream_->get_downstream_readcb(),
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upstream_->get_downstream_writecb(),
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upstream_->get_downstream_eventcb(), this);
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bufferevent_enable(bev_, EV_READ | EV_WRITE);
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bufferevent_set_timeouts(bev_,
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&get_config()->downstream_read_timeout,
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&get_config()->downstream_write_timeout);
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int rv = bufferevent_socket_connect
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(bev_,
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// TODO maybe not thread-safe?
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const_cast<sockaddr*>(&get_config()->downstream_addr.sa),
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get_config()->downstream_addrlen);
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if(rv == 0) {
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return 0;
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} else {
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return SHRPX_ERR_NETWORK;
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}
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}
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void Downstream::set_request_state(int state)
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{
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request_state_ = state;
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}
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int Downstream::get_request_state() const
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{
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return request_state_;
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}
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bool Downstream::get_chunked_request() const
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{
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return chunked_request_;
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}
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bool Downstream::get_request_connection_close() const
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{
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return request_connection_close_;
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}
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void Downstream::set_request_connection_close(bool f)
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{
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request_connection_close_ = f;
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}
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int Downstream::push_request_headers()
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{
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bool xff_found = false;
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std::string hdrs = request_method_;
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hdrs += " ";
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hdrs += request_path_;
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hdrs += " ";
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hdrs += "HTTP/1.1\r\n";
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hdrs += "Host: ";
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hdrs += get_config()->downstream_hostport;
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hdrs += "\r\n";
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// TODO Rewrite user-agent?
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for(Headers::const_iterator i = request_headers_.begin();
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i != request_headers_.end(); ++i) {
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if(util::strieq((*i).first.c_str(), "X-Forwarded-Proto")) {
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continue;
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}
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if(util::strieq((*i).first.c_str(), "user-agent")) {
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hdrs += "User-Agent: ";
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hdrs += get_config()->server_name;
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} else {
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hdrs += (*i).first;
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hdrs += ": ";
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hdrs += (*i).second;
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if(!xff_found && util::strieq((*i).first.c_str(), "X-Forwarded-For")) {
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xff_found = true;
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hdrs += ", ";
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hdrs += upstream_->get_client_handler()->get_ipaddr();
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}
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}
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hdrs += "\r\n";
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}
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hdrs += "Connection: close\r\n";
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if(!xff_found) {
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hdrs += "X-Forwarded-For: ";
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hdrs += upstream_->get_client_handler()->get_ipaddr();
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hdrs += "\r\n";
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}
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hdrs += "X-Forwarded-Proto: https\r\n";
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hdrs += "\r\n";
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if(ENABLE_LOG) {
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LOG(INFO) << "Downstream request headers\n" << hdrs;
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}
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evbuffer *output = bufferevent_get_output(bev_);
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evbuffer_add(output, hdrs.c_str(), hdrs.size());
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return 0;
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}
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int Downstream::push_upload_data_chunk(const uint8_t *data, size_t datalen)
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{
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// Assumes that request headers have already been pushed to output
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// buffer using push_request_headers().
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ssize_t res = 0;
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int rv;
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evbuffer *output = bufferevent_get_output(bev_);
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if(chunked_request_) {
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char chunk_size_hex[16];
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rv = snprintf(chunk_size_hex, sizeof(chunk_size_hex), "%X\r\n",
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static_cast<unsigned int>(datalen));
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evbuffer_add(output, chunk_size_hex, rv);
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res += rv;
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}
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rv = evbuffer_add(output, data, datalen);
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if(rv == -1) {
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return -1;
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}
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res += rv;
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return res;
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}
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int Downstream::end_upload_data()
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{
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if(chunked_request_) {
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evbuffer *output = bufferevent_get_output(bev_);
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evbuffer_add(output, "0\r\n\r\n", 5);
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}
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return 0;
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}
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const Headers& Downstream::get_response_headers() const
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{
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return response_headers_;
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}
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void Downstream::add_response_header(const std::string& name,
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const std::string& value)
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{
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response_headers_.push_back(std::make_pair(name, value));
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}
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void Downstream::set_last_response_header_value(const std::string& value)
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{
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Headers::value_type &item = response_headers_.back();
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item.second = value;
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check_transfer_encoding_chunked(&chunked_response_, item);
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}
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unsigned int Downstream::get_response_http_status() const
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{
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return response_http_status_;
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}
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void Downstream::set_response_http_status(unsigned int status)
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{
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response_http_status_ = status;
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}
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bool Downstream::get_chunked_response() const
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{
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return chunked_response_;
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}
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namespace {
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int htp_hdrs_completecb(htparser *htp)
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{
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Downstream *downstream;
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downstream = reinterpret_cast<Downstream*>(htparser_get_userdata(htp));
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downstream->set_response_http_status(htparser_get_status(htp));
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downstream->set_response_state(Downstream::HEADER_COMPLETE);
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downstream->get_upstream()->on_downstream_header_complete(downstream);
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return 0;
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}
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} // namespace
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namespace {
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int htp_hdr_keycb(htparser *htp, const char *data, size_t len)
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{
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Downstream *downstream;
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downstream = reinterpret_cast<Downstream*>(htparser_get_userdata(htp));
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downstream->add_response_header(std::string(data, len), "");
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return 0;
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}
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} // namespace
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namespace {
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int htp_hdr_valcb(htparser *htp, const char *data, size_t len)
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{
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Downstream *downstream;
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downstream = reinterpret_cast<Downstream*>(htparser_get_userdata(htp));
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downstream->set_last_response_header_value(std::string(data, len));
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return 0;
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}
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} // namespace
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namespace {
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int htp_bodycb(htparser *htp, const char *data, size_t len)
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{
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Downstream *downstream;
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downstream = reinterpret_cast<Downstream*>(htparser_get_userdata(htp));
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downstream->get_upstream()->on_downstream_body
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(downstream, reinterpret_cast<const uint8_t*>(data), len);
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return 0;
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}
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} // namespace
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namespace {
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int htp_body_completecb(htparser *htp)
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{
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Downstream *downstream;
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downstream = reinterpret_cast<Downstream*>(htparser_get_userdata(htp));
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downstream->set_response_state(Downstream::MSG_COMPLETE);
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downstream->get_upstream()->on_downstream_body_complete(downstream);
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return 0;
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}
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} // namespace
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namespace {
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htparse_hooks htp_hooks = {
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0, /*htparse_hook on_msg_begin;*/
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0, /*htparse_data_hook method;*/
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0, /* htparse_data_hook scheme;*/
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0, /* htparse_data_hook host; */
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0, /* htparse_data_hook port; */
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0, /* htparse_data_hook path; */
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0, /* htparse_data_hook args; */
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0, /* htparse_data_hook uri; */
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0, /* htparse_hook on_hdrs_begin; */
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htp_hdr_keycb, /* htparse_data_hook hdr_key; */
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htp_hdr_valcb, /* htparse_data_hook hdr_val; */
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htp_hdrs_completecb, /* htparse_hook on_hdrs_complete; */
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0, /*htparse_hook on_new_chunk;*/
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0, /*htparse_hook on_chunk_complete;*/
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0, /*htparse_hook on_chunks_complete;*/
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htp_bodycb, /* htparse_data_hook body; */
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htp_body_completecb /* htparse_hook on_msg_complete;*/
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};
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} // namespace
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int Downstream::parse_http_response()
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{
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evbuffer *input = bufferevent_get_input(bev_);
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unsigned char *mem = evbuffer_pullup(input, -1);
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size_t nread = htparser_run(response_htp_, &htp_hooks,
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reinterpret_cast<const char*>(mem),
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evbuffer_get_length(input));
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evbuffer_drain(input, nread);
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if(htparser_get_error(response_htp_) == htparse_error_none) {
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return 0;
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} else {
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if(ENABLE_LOG) {
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LOG(INFO) << "Downstream HTTP parser failure: "
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<< htparser_get_strerror(response_htp_);
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}
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return SHRPX_ERR_HTTP_PARSE;
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}
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}
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void Downstream::set_response_state(int state)
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{
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response_state_ = state;
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}
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int Downstream::get_response_state() const
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{
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return response_state_;
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}
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namespace {
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void body_buf_cb(evbuffer *body, size_t oldlen, size_t newlen, void *arg)
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{
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Downstream *downstream = reinterpret_cast<Downstream*>(arg);
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if(newlen == 0) {
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downstream->resume_read(SHRPX_NO_BUFFER);
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}
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}
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} // namespace
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int Downstream::init_response_body_buf()
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{
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assert(response_body_buf_ == 0);
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response_body_buf_ = evbuffer_new();
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if(response_body_buf_ == 0) {
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DIE();
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}
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evbuffer_setcb(response_body_buf_, body_buf_cb, this);
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return 0;
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}
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evbuffer* Downstream::get_response_body_buf()
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{
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return response_body_buf_;
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}
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} // namespace shrpx
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