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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_spdy_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_spdy_session.h"
#include "http2.h"
#include "util.h"
using namespace nghttp2;
namespace shrpx {
SpdyDownstreamConnection::SpdyDownstreamConnection
(ClientHandler *client_handler)
: DownstreamConnection(client_handler),
spdy_(client_handler->get_spdy_session()),
request_body_buf_(0),
sd_(0),
recv_window_size_(0)
{}
SpdyDownstreamConnection::~SpdyDownstreamConnection()
{
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) {
spdy_->notify();
}
}
spdy_->remove_downstream_connection(this);
// Downstream and DownstreamConnection may be deleted
// asynchronously.
if(downstream_) {
downstream_->set_downstream_connection(0);
}
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Deleted";
}
}
int SpdyDownstreamConnection::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_ == 0) {
return -1;
}
evbuffer_setcb(request_body_buf_, 0, this);
}
return 0;
}
int SpdyDownstreamConnection::attach_downstream(Downstream *downstream)
{
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Attaching to DOWNSTREAM:" << downstream;
}
if(init_request_body_buf() == -1) {
return -1;
}
spdy_->add_downstream_connection(this);
if(spdy_->get_state() == SpdySession::DISCONNECTED) {
spdy_->notify();
}
downstream->set_downstream_connection(this);
downstream_ = downstream;
recv_window_size_ = 0;
return 0;
}
void SpdyDownstreamConnection::detach_downstream(Downstream *downstream)
{
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Detaching from DOWNSTREAM:" << downstream;
}
if(submit_rst_stream(downstream) == 0) {
spdy_->notify();
}
downstream->set_downstream_connection(0);
downstream_ = 0;
client_handler_->pool_downstream_connection(this);
}
int SpdyDownstreamConnection::submit_rst_stream(Downstream *downstream)
{
int rv = -1;
if(spdy_->get_state() == SpdySession::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 = spdy_->submit_rst_stream(this,
downstream->get_downstream_stream_id(),
NGHTTP2_INTERNAL_ERROR);
}
}
return rv;
}
namespace {
ssize_t spdy_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)
{
StreamData *sd;
sd = reinterpret_cast<StreamData*>
(nghttp2_session_get_stream_user_data(session, stream_id));
if(!sd || !sd->dconn) {
return NGHTTP2_ERR_DEFERRED;
}
SpdyDownstreamConnection *dconn;
dconn = reinterpret_cast<SpdyDownstreamConnection*>(source->ptr);
Downstream *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;
}
evbuffer *body = dconn->get_request_body_buf();
int nread = 0;
for(;;) {
nread = evbuffer_remove(body, buf, length);
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) == -1) {
// In this case, downstream may be deleted.
return NGHTTP2_ERR_DEFERRED;
}
// Check dconn is still alive because Upstream::resume_read()
// may delete downstream which will delete dconn.
if(sd->dconn == 0) {
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 {
break;
}
}
return nread;
}
} // namespace
int SpdyDownstreamConnection::push_request_headers()
{
int rv;
if(spdy_->get_state() != SpdySession::CONNECTED) {
// The SPDY 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();
downstream_->normalize_request_headers();
auto end_headers = std::end(downstream_->get_request_headers());
// 10 means :method, :scheme, :path and possible via and
// x-forwarded-for header fields. We rename host header field as
// :host.
auto nv = util::make_unique<const char*[]>(nheader * 2 + 10 + 1);
size_t hdidx = 0;
std::string via_value;
std::string xff_value;
std::string scheme, path, query;
if(downstream_->get_request_method() == "CONNECT") {
// No :scheme header field for CONNECT method.
nv[hdidx++] = ":path";
nv[hdidx++] = downstream_->get_request_path().c_str();
} else {
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(path, &u, UF_PATH, url);
http2::copy_url_component(query, &u, UF_QUERY, url);
if(path.empty()) {
path = "/";
}
if(!query.empty()) {
path += "?";
path += query;
}
}
nv[hdidx++] = ":scheme";
if(scheme.empty()) {
// The default scheme is http. For SPDY upstream, the path must
// be absolute URI, so scheme should be provided.
nv[hdidx++] = "http";
} else {
nv[hdidx++] = scheme.c_str();
}
nv[hdidx++] = ":path";
if(path.empty()) {
nv[hdidx++] = downstream_->get_request_path().c_str();
} else {
nv[hdidx++] = path.c_str();
}
}
nv[hdidx++] = ":method";
nv[hdidx++] = downstream_->get_request_method().c_str();
hdidx += http2::copy_norm_headers_to_nv(&nv[hdidx],
downstream_->get_request_headers());
auto host = downstream_->get_norm_request_header("host");
if(host == end_headers) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "host header field missing";
}
return -1;
}
nv[hdidx++] = ":host";
nv[hdidx++] = (*host).second.c_str();
bool content_length = false;
if(downstream_->get_norm_request_header("content-length") != end_headers) {
content_length = true;
}
auto expect = downstream_->get_norm_request_header("expect");
if(expect != end_headers &&
!util::strifind((*expect).second.c_str(), "100-continue")) {
nv[hdidx++] = "expect";
nv[hdidx++] = (*expect).second.c_str();
}
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) {
nv[hdidx++] = "x-forwarded-for";
if(xff != end_headers) {
xff_value = (*xff).second;
xff_value += ", ";
}
xff_value += downstream_->get_upstream()->get_client_handler()->
get_ipaddr();
nv[hdidx++] = xff_value.c_str();
} else if(xff != end_headers) {
nv[hdidx++] = "x-forwarded-for";
nv[hdidx++] = (*xff).second.c_str();
}
auto via = downstream_->get_norm_request_header("via");
if(get_config()->no_via) {
if(via != end_headers) {
nv[hdidx++] = "via";
nv[hdidx++] = (*via).second.c_str();
}
} 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());
nv[hdidx++] = "via";
nv[hdidx++] = via_value.c_str();
}
nv[hdidx++] = nullptr;
if(LOG_ENABLED(INFO)) {
std::stringstream ss;
for(size_t i = 0; nv[i]; i += 2) {
ss << TTY_HTTP_HD << nv[i] << TTY_RST << ": " << nv[i+1] << "\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 = spdy_data_read_callback;
rv = spdy_->submit_request(this, 0, nv.get(), &data_prd);
} else {
rv = spdy_->submit_request(this, 0, nv.get(), 0);
}
if(rv != 0) {
DCLOG(FATAL, this) << "nghttp2_submit_request() failed";
return -1;
}
spdy_->notify();
return 0;
}
int SpdyDownstreamConnection::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 = spdy_->resume_data(this);
if(rv != 0) {
return -1;
}
spdy_->notify();
}
return 0;
}
int SpdyDownstreamConnection::end_upload_data()
{
int rv;
if(downstream_->get_downstream_stream_id() != -1) {
rv = spdy_->resume_data(this);
if(rv != 0) {
return -1;
}
spdy_->notify();
}
return 0;
}
int SpdyDownstreamConnection::resume_read(IOCtrlReason reason)
{
int rv;
if(spdy_->get_state() == SpdySession::CONNECTED &&
spdy_->get_flow_control() &&
downstream_ && downstream_->get_downstream_stream_id() != -1 &&
recv_window_size_ >= spdy_->get_initial_window_size()/2) {
rv = spdy_->submit_window_update(this, recv_window_size_);
if(rv == -1) {
return -1;
}
spdy_->notify();
recv_window_size_ = 0;
}
return 0;
}
int SpdyDownstreamConnection::on_read()
{
return 0;
}
int SpdyDownstreamConnection::on_write()
{
return 0;
}
evbuffer* SpdyDownstreamConnection::get_request_body_buf() const
{
return request_body_buf_;
}
void SpdyDownstreamConnection::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* SpdyDownstreamConnection::detach_stream_data()
{
if(sd_) {
StreamData *sd = sd_;
sd_ = 0;
sd->dconn = 0;
return sd;
} else {
return 0;
}
}
bool SpdyDownstreamConnection::get_output_buffer_full()
{
if(request_body_buf_) {
return
evbuffer_get_length(request_body_buf_) >= Downstream::OUTPUT_UPPER_THRES;
} else {
return false;
}
}
int32_t SpdyDownstreamConnection::get_recv_window_size() const
{
return recv_window_size_;
}
void SpdyDownstreamConnection::inc_recv_window_size(int32_t amount)
{
recv_window_size_ += amount;
}
} // namespace shrpx
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