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nghttp2/src/shrpx_https_upstream.cc

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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_https_upstream.h"
#include <cassert>
#include <set>
#include <sstream>
#include "shrpx_client_handler.h"
#include "shrpx_downstream.h"
#include "shrpx_downstream_connection.h"
#include "shrpx_http2_downstream_connection.h"
#include "shrpx_http.h"
#include "shrpx_config.h"
#include "shrpx_error.h"
#include "shrpx_accesslog.h"
#include "http2.h"
#include "util.h"
using namespace nghttp2;
namespace shrpx {
namespace {
const size_t SHRPX_HTTPS_UPSTREAM_OUTPUT_UPPER_THRES = 64*1024;
const size_t SHRPX_HTTPS_MAX_HEADER_LENGTH = 64*1024;
} // namespace
HttpsUpstream::HttpsUpstream(ClientHandler *handler)
: handler_(handler),
current_header_length_(0),
downstream_(nullptr),
ioctrl_(handler->get_bev())
{
http_parser_init(&htp_, HTTP_REQUEST);
htp_.data = this;
}
HttpsUpstream::~HttpsUpstream()
{
delete downstream_;
}
void HttpsUpstream::reset_current_header_length()
{
current_header_length_ = 0;
}
namespace {
int htp_msg_begin(http_parser *htp)
{
auto upstream = reinterpret_cast<HttpsUpstream*>(htp->data);
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "HTTP request started";
}
upstream->reset_current_header_length();
auto downstream = new Downstream(upstream, 0, NGHTTP2_PRI_DEFAULT);
upstream->attach_downstream(downstream);
return 0;
}
} // namespace
namespace {
int htp_uricb(http_parser *htp, const char *data, size_t len)
{
auto upstream = reinterpret_cast<HttpsUpstream*>(htp->data);
auto downstream = upstream->get_downstream();
downstream->append_request_path(data, len);
return 0;
}
} // namespace
namespace {
int htp_hdr_keycb(http_parser *htp, const char *data, size_t len)
{
auto upstream = reinterpret_cast<HttpsUpstream*>(htp->data);
auto downstream = upstream->get_downstream();
if(downstream->get_request_header_key_prev()) {
downstream->append_last_request_header_key(data, len);
} else {
downstream->add_request_header(std::string(data, len), "");
}
return 0;
}
} // namespace
namespace {
int htp_hdr_valcb(http_parser *htp, const char *data, size_t len)
{
auto upstream = reinterpret_cast<HttpsUpstream*>(htp->data);
auto downstream = upstream->get_downstream();
if(downstream->get_request_header_key_prev()) {
downstream->set_last_request_header_value(std::string(data, len));
} else {
downstream->append_last_request_header_value(data, len);
}
return 0;
}
} // namespace
namespace {
int htp_hdrs_completecb(http_parser *htp)
{
int rv;
auto upstream = reinterpret_cast<HttpsUpstream*>(htp->data);
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "HTTP request headers completed";
}
auto downstream = upstream->get_downstream();
downstream->set_request_method(http_method_str((enum http_method)htp->method));
downstream->set_request_major(htp->http_major);
downstream->set_request_minor(htp->http_minor);
downstream->set_request_connection_close(!http_should_keep_alive(htp));
downstream->check_upgrade_request();
if(LOG_ENABLED(INFO)) {
std::stringstream ss;
ss << downstream->get_request_method() << " "
<< downstream->get_request_path() << " "
<< "HTTP/" << downstream->get_request_major() << "."
<< downstream->get_request_minor() << "\n";
const auto& headers = downstream->get_request_headers();
for(size_t i = 0; i < headers.size(); ++i) {
ss << TTY_HTTP_HD << headers[i].first << TTY_RST << ": "
<< headers[i].second << "\n";
}
ULOG(INFO, upstream) << "HTTP request headers\n" << ss.str();
}
if(get_config()->client_proxy &&
downstream->get_request_method() != "CONNECT") {
// Make sure that request path is an absolute URI.
http_parser_url u;
auto 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 || !(u.field_set & (1 << UF_SCHEMA))) {
// Expect to respond with 400 bad request
return -1;
}
}
auto dconn = upstream->get_client_handler()->get_downstream_connection();
if(downstream->get_expect_100_continue()) {
static const char reply_100[] = "HTTP/1.1 100 Continue\r\n\r\n";
if(bufferevent_write(upstream->get_client_handler()->get_bev(),
reply_100, sizeof(reply_100)-1) != 0) {
ULOG(FATAL, upstream) << "bufferevent_write() faild";
delete dconn;
return -1;
}
}
rv = dconn->attach_downstream(downstream);
if(rv != 0) {
downstream->set_request_state(Downstream::CONNECT_FAIL);
downstream->set_downstream_connection(0);
delete dconn;
return -1;
} else {
rv = downstream->push_request_headers();
if(rv != 0) {
return -1;
}
downstream->set_request_state(Downstream::HEADER_COMPLETE);
return 0;
}
}
} // namespace
namespace {
int htp_bodycb(http_parser *htp, const char *data, size_t len)
{
int rv;
auto upstream = reinterpret_cast<HttpsUpstream*>(htp->data);
auto downstream = upstream->get_downstream();
rv = downstream->push_upload_data_chunk
(reinterpret_cast<const uint8_t*>(data), len);
if(rv != 0) {
return -1;
}
return 0;
}
} // namespace
namespace {
int htp_msg_completecb(http_parser *htp)
{
int rv;
auto upstream = reinterpret_cast<HttpsUpstream*>(htp->data);
if(LOG_ENABLED(INFO)) {
ULOG(INFO, upstream) << "HTTP request completed";
}
auto downstream = upstream->get_downstream();
downstream->set_request_state(Downstream::MSG_COMPLETE);
rv = downstream->end_upload_data();
if(rv != 0) {
return -1;
}
// Stop further processing to complete this request
http_parser_pause(htp, 1);
return 0;
}
} // namespace
namespace {
http_parser_settings htp_hooks = {
htp_msg_begin, /*http_cb on_message_begin;*/
htp_uricb, /*http_data_cb on_url;*/
nullptr, /*http_cb on_status_complete */
htp_hdr_keycb, /*http_data_cb on_header_field;*/
htp_hdr_valcb, /*http_data_cb on_header_value;*/
htp_hdrs_completecb, /*http_cb on_headers_complete;*/
htp_bodycb, /*http_data_cb on_body;*/
htp_msg_completecb /*http_cb on_message_complete;*/
};
} // namespace
// on_read() does not consume all available data in input buffer if
// one http request is fully received.
int HttpsUpstream::on_read()
{
auto bev = handler_->get_bev();
auto input = bufferevent_get_input(bev);
size_t inputlen = evbuffer_get_length(input);
auto mem = evbuffer_pullup(input, -1);
if(inputlen == 0) {
return 0;
}
auto downstream = get_downstream();
// downstream can be nullptr here, because it is initialized in the
// callback chain called by http_parser_execute()
if(downstream && downstream->get_upgraded()) {
int rv = downstream->push_upload_data_chunk
(reinterpret_cast<const uint8_t*>(mem), inputlen);
evbuffer_drain(input, inputlen);
if(rv != 0) {
return -1;
}
if(downstream->get_output_buffer_full()) {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "Downstream output buffer is full";
}
pause_read(SHRPX_NO_BUFFER);
}
return 0;
}
size_t nread = http_parser_execute(&htp_, &htp_hooks,
reinterpret_cast<const char*>(mem),
inputlen);
evbuffer_drain(input, nread);
// Well, actually header length + some body bytes
current_header_length_ += nread;
// Get downstream again because it may be initialized in http parser
// execution
downstream = get_downstream();
auto handler = get_client_handler();
auto htperr = HTTP_PARSER_ERRNO(&htp_);
if(htperr == HPE_PAUSED) {
if(downstream->get_request_state() == Downstream::CONNECT_FAIL) {
handler->set_should_close_after_write(true);
// Following paues_read is needed to avoid reading next data.
pause_read(SHRPX_MSG_BLOCK);
if(error_reply(503) != 0) {
return -1;
}
// Downstream gets deleted after response body is read.
} else {
assert(downstream->get_request_state() == Downstream::MSG_COMPLETE);
if(downstream->get_downstream_connection() == 0) {
// Error response has already be sent
assert(downstream->get_response_state() == Downstream::MSG_COMPLETE);
delete_downstream();
} else {
if(handler->get_http2_upgrade_allowed() &&
downstream->http2_upgrade_request()) {
if(handler->perform_http2_upgrade(this) != 0) {
return -1;
}
return 0;
}
pause_read(SHRPX_MSG_BLOCK);
}
}
} else if(htperr == HPE_OK) {
// downstream can be NULL here.
if(downstream) {
if(downstream->get_request_state() == Downstream::INITIAL &&
current_header_length_ > SHRPX_HTTPS_MAX_HEADER_LENGTH) {
ULOG(WARNING, this) << "Request Header too long:"
<< current_header_length_
<< " bytes";
handler->set_should_close_after_write(true);
pause_read(SHRPX_MSG_BLOCK);
if(error_reply(400) != 0) {
return -1;
}
} else if(downstream->get_output_buffer_full()) {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "Downstream output buffer is full";
}
pause_read(SHRPX_NO_BUFFER);
}
}
} else {
if(LOG_ENABLED(INFO)) {
ULOG(INFO, this) << "HTTP parse failure: "
<< "(" << http_errno_name(htperr) << ") "
<< http_errno_description(htperr);
}
handler->set_should_close_after_write(true);
pause_read(SHRPX_MSG_BLOCK);
if(error_reply(400) != 0) {
return -1;
}
}
return 0;
}
int HttpsUpstream::on_write()
{
int rv = 0;
auto downstream = get_downstream();
if(downstream) {
rv = downstream->resume_read(SHRPX_NO_BUFFER);
}
return rv;
}
int HttpsUpstream::on_event()
{
return 0;
}
ClientHandler* HttpsUpstream::get_client_handler() const
{
return handler_;
}
void HttpsUpstream::pause_read(IOCtrlReason reason)
{
ioctrl_.pause_read(reason);
}
int HttpsUpstream::resume_read(IOCtrlReason reason, Downstream *downstream)
{
if(ioctrl_.resume_read(reason)) {
// Process remaining data in input buffer here because these bytes
// are not notified by readcb until new data arrive.
http_parser_pause(&htp_, 0);
return on_read();
} else {
return 0;
}
}
namespace {
void https_downstream_readcb(bufferevent *bev, void *ptr)
{
auto dconn = reinterpret_cast<DownstreamConnection*>(ptr);
auto downstream = dconn->get_downstream();
auto upstream = static_cast<HttpsUpstream*>(downstream->get_upstream());
int rv;
rv = downstream->on_read();
if(downstream->get_response_state() == Downstream::MSG_RESET) {
delete upstream->get_client_handler();
} else if(rv == 0) {
if(downstream->get_response_state() == Downstream::MSG_COMPLETE) {
if(downstream->get_response_connection_close()) {
// Connection close
downstream->set_downstream_connection(0);
delete dconn;
dconn = 0;
} else {
// Keep-alive
dconn->detach_downstream(downstream);
}
auto handler = upstream->get_client_handler();
if(downstream->get_request_state() == Downstream::MSG_COMPLETE) {
if(handler->get_should_close_after_write() &&
handler->get_pending_write_length() == 0) {
// If all upstream response body has already written out to
// the peer, we cannot use writecb for ClientHandler. In
// this case, we just delete handler here.
delete handler;
return;
} else {
upstream->delete_downstream();
// Process next HTTP request
if(upstream->resume_read(SHRPX_MSG_BLOCK, 0) == -1) {
return;
}
}
} else if(downstream->get_upgraded()) {
// This path is effectively only taken for HTTP2 downstream
// because only HTTP2 downstream sets response_state to
// MSG_COMPLETE and this function. For HTTP downstream, EOF
// from tunnel connection is handled on
// https_downstream_eventcb.
//
// Tunneled connection always indicates connection close.
if(handler->get_pending_write_length() == 0) {
// For tunneled connection, if there is no pending data,
// delete handler because on_write will not be called.
delete handler;
} else {
if(LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "Tunneled connection has pending data";
}
}
}
} else {
auto handler = upstream->get_client_handler();
auto bev = handler->get_bev();
size_t outputlen = evbuffer_get_length(bufferevent_get_output(bev));
if(outputlen > SHRPX_HTTPS_UPSTREAM_OUTPUT_UPPER_THRES) {
downstream->pause_read(SHRPX_NO_BUFFER);
}
}
} else {
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
// We already sent HTTP response headers to upstream
// client. Just close the upstream connection.
delete upstream->get_client_handler();
} else {
// We did not sent any HTTP response, so sent error
// response. Cannot reuse downstream connection in this case.
if(upstream->error_reply(502) != 0) {
delete upstream->get_client_handler();
return;
}
if(downstream->get_request_state() == Downstream::MSG_COMPLETE) {
upstream->delete_downstream();
// Process next HTTP request
if(upstream->resume_read(SHRPX_MSG_BLOCK, 0) == -1) {
return;
}
}
}
}
}
} // namespace
namespace {
void https_downstream_writecb(bufferevent *bev, void *ptr)
{
if(evbuffer_get_length(bufferevent_get_output(bev)) > 0) {
return;
}
auto dconn = reinterpret_cast<DownstreamConnection*>(ptr);
auto downstream = dconn->get_downstream();
auto upstream = static_cast<HttpsUpstream*>(downstream->get_upstream());
// May return -1
upstream->resume_read(SHRPX_NO_BUFFER, downstream);
}
} // namespace
namespace {
void https_downstream_eventcb(bufferevent *bev, short events, void *ptr)
{
auto dconn = reinterpret_cast<DownstreamConnection*>(ptr);
auto downstream = dconn->get_downstream();
auto upstream = static_cast<HttpsUpstream*>(downstream->get_upstream());
if(events & BEV_EVENT_CONNECTED) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "Connection established";
}
} else if(events & BEV_EVENT_EOF) {
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "EOF";
}
if(downstream->get_response_state() == Downstream::HEADER_COMPLETE) {
// Server may indicate the end of the request by EOF
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "The end of the response body was indicated by "
<< "EOF";
}
upstream->on_downstream_body_complete(downstream);
downstream->set_response_state(Downstream::MSG_COMPLETE);
auto handler = upstream->get_client_handler();
if(handler->get_should_close_after_write() &&
handler->get_pending_write_length() == 0) {
// If all upstream response body has already written out to
// the peer, we cannot use writecb for ClientHandler. In this
// case, we just delete handler here.
delete handler;
return;
}
} else if(downstream->get_response_state() == Downstream::MSG_COMPLETE) {
// Nothing to do
} else {
// error
if(LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "Treated as error";
}
if(upstream->error_reply(502) != 0) {
delete upstream->get_client_handler();
return;
}
}
if(downstream->get_request_state() == Downstream::MSG_COMPLETE) {
upstream->delete_downstream();
if(upstream->resume_read(SHRPX_MSG_BLOCK, 0) == -1) {
return;
}
}
} else if(events & (BEV_EVENT_ERROR | BEV_EVENT_TIMEOUT)) {
if(LOG_ENABLED(INFO)) {
if(events & BEV_EVENT_ERROR) {
DCLOG(INFO, dconn) << "Network error";
} else {
DCLOG(INFO, dconn) << "Timeout";
}
}
if(downstream->get_response_state() == Downstream::INITIAL) {
unsigned int status;
if(events & BEV_EVENT_TIMEOUT) {
status = 504;
} else {
status = 502;
}
if(upstream->error_reply(status) != 0) {
delete upstream->get_client_handler();
return;
}
}
if(downstream->get_request_state() == Downstream::MSG_COMPLETE) {
upstream->delete_downstream();
if(upstream->resume_read(SHRPX_MSG_BLOCK, 0) == -1) {
return;
}
}
}
}
} // namespace
int HttpsUpstream::error_reply(unsigned int status_code)
{
auto html = http::create_error_html(status_code);
std::string header;
header.reserve(512);
header += "HTTP/1.1 ";
header += http2::get_status_string(status_code);
header += "\r\nServer: ";
header += get_config()->server_name;
header += "\r\nContent-Length: ";
header += util::utos(html.size());
header += "\r\nContent-Type: text/html; charset=UTF-8\r\n";
if(get_client_handler()->get_should_close_after_write()) {
header += "Connection: close\r\n";
}
header += "\r\n";
auto output = bufferevent_get_output(handler_->get_bev());
if(evbuffer_add(output, header.c_str(), header.size()) != 0 ||
evbuffer_add(output, html.c_str(), html.size()) != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
auto downstream = get_downstream();
if(downstream) {
downstream->set_response_state(Downstream::MSG_COMPLETE);
}
if(get_config()->accesslog) {
upstream_response(this->get_client_handler()->get_ipaddr(), status_code,
downstream);
}
return 0;
}
bufferevent_data_cb HttpsUpstream::get_downstream_readcb()
{
return https_downstream_readcb;
}
bufferevent_data_cb HttpsUpstream::get_downstream_writecb()
{
return https_downstream_writecb;
}
bufferevent_event_cb HttpsUpstream::get_downstream_eventcb()
{
return https_downstream_eventcb;
}
void HttpsUpstream::attach_downstream(Downstream *downstream)
{
assert(!downstream_);
downstream_ = downstream;
}
void HttpsUpstream::delete_downstream()
{
delete downstream_;
downstream_ = 0;
}
Downstream* HttpsUpstream::get_downstream() const
{
return downstream_;
}
Downstream* HttpsUpstream::pop_downstream()
{
auto downstream = downstream_;
downstream_ = nullptr;
return downstream;
}
int HttpsUpstream::on_downstream_header_complete(Downstream *downstream)
{
if(LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "HTTP response header completed";
}
char temp[16];
snprintf(temp, sizeof(temp), "HTTP/%d.%d ",
downstream->get_request_major(),
downstream->get_request_minor());
std::string hdrs = temp;
hdrs += http2::get_status_string(downstream->get_response_http_status());
hdrs += "\r\n";
downstream->normalize_response_headers();
auto end_headers = std::end(downstream->get_response_headers());
http2::build_http1_headers_from_norm_headers
(hdrs, downstream->get_response_headers());
// We check downstream->get_response_connection_close() in case when
// the Content-Length is not available.
if(!downstream->get_request_connection_close() &&
!downstream->get_response_connection_close()) {
if(downstream->get_request_major() <= 0 ||
downstream->get_request_minor() <= 0) {
// We add this header for HTTP/1.0 or HTTP/0.9 clients
hdrs += "Connection: Keep-Alive\r\n";
}
} else {
hdrs += "Connection: close\r\n";
}
auto via = downstream->get_norm_response_header("via");
if(get_config()->no_via) {
if(via != end_headers) {
hdrs += "Via: ";
hdrs += (*via).second;
http2::sanitize_header_value(hdrs, hdrs.size() - (*via).second.size());
hdrs += "\r\n";
}
} else {
hdrs += "Via: ";
if(via != end_headers) {
hdrs += (*via).second;
http2::sanitize_header_value(hdrs, hdrs.size() - (*via).second.size());
hdrs += ", ";
}
hdrs += http::create_via_header_value
(downstream->get_response_major(), downstream->get_response_minor());
hdrs += "\r\n";
}
hdrs += "\r\n";
if(LOG_ENABLED(INFO)) {
const char *hdrp;
std::string nhdrs;
if(get_config()->tty) {
nhdrs = http::colorizeHeaders(hdrs.c_str());
hdrp = nhdrs.c_str();
} else {
hdrp = hdrs.c_str();
}
ULOG(INFO, this) << "HTTP response headers\n" << hdrp;
}
auto output = bufferevent_get_output(handler_->get_bev());
if(evbuffer_add(output, hdrs.c_str(), hdrs.size()) != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
if(get_config()->accesslog) {
upstream_response(this->get_client_handler()->get_ipaddr(),
downstream->get_response_http_status(), downstream);
}
return 0;
}
int HttpsUpstream::on_downstream_body(Downstream *downstream,
const uint8_t *data, size_t len)
{
int rv;
if(len == 0) {
return 0;
}
auto output = bufferevent_get_output(handler_->get_bev());
if(downstream->get_chunked_response()) {
char chunk_size_hex[16];
rv = snprintf(chunk_size_hex, sizeof(chunk_size_hex), "%X\r\n",
static_cast<unsigned int>(len));
if(evbuffer_add(output, chunk_size_hex, rv) != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
}
if(evbuffer_add(output, data, len) != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
if(downstream->get_chunked_response()) {
if(evbuffer_add(output, "\r\n", 2) != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
}
return 0;
}
int HttpsUpstream::on_downstream_body_complete(Downstream *downstream)
{
if(downstream->get_chunked_response()) {
auto output = bufferevent_get_output(handler_->get_bev());
if(evbuffer_add(output, "0\r\n\r\n", 5) != 0) {
ULOG(FATAL, this) << "evbuffer_add() failed";
return -1;
}
}
if(LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "HTTP response completed";
}
if(downstream->get_request_connection_close() ||
downstream->get_response_connection_close()) {
auto handler = get_client_handler();
handler->set_should_close_after_write(true);
}
return 0;
}
} // namespace shrpx
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