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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_http_downstream_connection.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_log_config.h"
#include "shrpx_connect_blocker.h"
#include "shrpx_downstream_connection_pool.h"
#include "shrpx_worker.h"
#include "http2.h"
#include "util.h"
using namespace nghttp2;
namespace shrpx {
namespace {
void timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "Time out";
}
auto downstream = dconn->get_downstream();
auto upstream = downstream->get_upstream();
auto handler = upstream->get_client_handler();
// Do this so that dconn is not pooled
downstream->set_response_connection_close(true);
if (upstream->downstream_error(dconn, Downstream::EVENT_TIMEOUT) != 0) {
delete handler;
}
}
} // namespace
namespace {
void readcb(struct ev_loop *loop, ev_io *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
auto downstream = dconn->get_downstream();
auto upstream = downstream->get_upstream();
auto handler = upstream->get_client_handler();
if (upstream->downstream_read(dconn) != 0) {
delete handler;
}
}
} // namespace
namespace {
void writecb(struct ev_loop *loop, ev_io *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
auto downstream = dconn->get_downstream();
auto upstream = downstream->get_upstream();
auto handler = upstream->get_client_handler();
if (upstream->downstream_write(dconn) != 0) {
delete handler;
}
}
} // namespace
namespace {
void connectcb(struct ev_loop *loop, ev_io *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
auto downstream = dconn->get_downstream();
auto upstream = downstream->get_upstream();
auto handler = upstream->get_client_handler();
if (dconn->on_connect() != 0) {
if (upstream->on_downstream_abort_request(downstream, 503) != 0) {
delete handler;
}
return;
}
writecb(loop, w, revents);
}
} // namespace
HttpDownstreamConnection::HttpDownstreamConnection(
DownstreamConnectionPool *dconn_pool, struct ev_loop *loop)
: DownstreamConnection(dconn_pool),
conn_(loop, -1, nullptr, get_config()->downstream_write_timeout,
get_config()->downstream_read_timeout, 0, 0, 0, 0, connectcb,
readcb, timeoutcb, this),
ioctrl_(&conn_.rlimit), response_htp_{0}, addr_idx_(0) {}
HttpDownstreamConnection::~HttpDownstreamConnection() {
// Downstream and DownstreamConnection may be deleted
// asynchronously.
if (downstream_) {
downstream_->release_downstream_connection();
}
}
int HttpDownstreamConnection::attach_downstream(Downstream *downstream) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Attaching to DOWNSTREAM:" << downstream;
}
if (conn_.fd == -1) {
auto connect_blocker = client_handler_->get_connect_blocker();
if (connect_blocker->blocked()) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this)
<< "Downstream connection was blocked by connect_blocker";
}
return -1;
}
auto worker = client_handler_->get_worker();
auto worker_stat = worker->get_worker_stat();
auto end = worker_stat->next_downstream;
for (;;) {
auto i = worker_stat->next_downstream;
++worker_stat->next_downstream;
worker_stat->next_downstream %= get_config()->downstream_addrs.size();
conn_.fd = util::create_nonblock_socket(
get_config()->downstream_addrs[i].addr.storage.ss_family);
if (conn_.fd == -1) {
auto error = errno;
DCLOG(WARN, this) << "socket() failed; errno=" << error;
connect_blocker->on_failure();
return SHRPX_ERR_NETWORK;
}
int rv;
rv = connect(conn_.fd, &get_config()->downstream_addrs[i].addr.sa,
get_config()->downstream_addrs[i].addrlen);
if (rv != 0 && errno != EINPROGRESS) {
auto error = errno;
DCLOG(WARN, this) << "connect() failed; errno=" << error;
connect_blocker->on_failure();
close(conn_.fd);
conn_.fd = -1;
if (end == worker_stat->next_downstream) {
return SHRPX_ERR_NETWORK;
}
// Try again with the next downstream server
continue;
}
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Connecting to downstream server";
}
addr_idx_ = i;
ev_io_set(&conn_.wev, conn_.fd, EV_WRITE);
ev_io_set(&conn_.rev, conn_.fd, EV_READ);
conn_.wlimit.startw();
break;
}
}
downstream_ = downstream;
http_parser_init(&response_htp_, HTTP_RESPONSE);
response_htp_.data = downstream_;
ev_set_cb(&conn_.rev, readcb);
conn_.rt.repeat = get_config()->downstream_read_timeout;
ev_timer_again(conn_.loop, &conn_.rt);
// TODO we should have timeout for connection establishment
ev_timer_again(conn_.loop, &conn_.wt);
return 0;
}
int HttpDownstreamConnection::push_request_headers() {
const char *authority = nullptr, *host = nullptr;
auto downstream_hostport =
get_config()->downstream_addrs[addr_idx_].hostport.get();
if (!get_config()->no_host_rewrite && !get_config()->http2_proxy &&
!get_config()->client_proxy &&
downstream_->get_request_method() != "CONNECT") {
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);
}
downstream_->assemble_request_cookie();
// Assume that method and request path do not contain \r\n.
std::string hdrs = downstream_->get_request_method();
hdrs += ' ';
if (downstream_->get_request_method() == "CONNECT") {
if (authority) {
hdrs += authority;
} else {
hdrs += downstream_->get_request_path();
}
} else if (get_config()->http2_proxy || get_config()->client_proxy) {
// Construct absolute-form request target because we are going to
// send a request to a HTTP/1 proxy.
if (downstream_->get_request_http2_scheme().empty()) {
// this comes from HTTP/1 upstream, use http scheme. We don't
// support https forward link yet.
hdrs += "http://";
} else {
hdrs += downstream_->get_request_http2_scheme();
hdrs += "://";
}
if (authority) {
hdrs += authority;
} else {
hdrs += host;
}
// Server-wide OPTIONS takes following form in proxy request:
//
// OPTIONS http://example.org HTTP/1.1
//
// Notice that no slash after authority. See
// http://tools.ietf.org/html/rfc7230#section-5.3.4
if (downstream_->get_request_path() != "*") {
hdrs += downstream_->get_request_path();
}
} else {
// No proxy case.
hdrs += downstream_->get_request_path();
}
hdrs += " HTTP/1.1\r\nHost: ";
if (authority) {
hdrs += authority;
} else {
hdrs += host;
}
hdrs += "\r\n";
http2::build_http1_headers_from_headers(hdrs,
downstream_->get_request_headers());
if (!downstream_->get_assembled_request_cookie().empty()) {
hdrs += "Cookie: ";
hdrs += downstream_->get_assembled_request_cookie();
hdrs += "\r\n";
}
if (downstream_->get_request_method() != "CONNECT" &&
downstream_->get_request_http2_expect_body() &&
!downstream_->get_request_header(http2::HD_CONTENT_LENGTH)) {
downstream_->set_chunked_request(true);
hdrs += "Transfer-Encoding: chunked\r\n";
}
if (downstream_->get_request_connection_close()) {
hdrs += "Connection: close\r\n";
}
auto xff = downstream_->get_request_header(http2::HD_X_FORWARDED_FOR);
if (get_config()->add_x_forwarded_for) {
hdrs += "X-Forwarded-For: ";
if (xff && !get_config()->strip_incoming_x_forwarded_for) {
hdrs += (*xff).value;
hdrs += ", ";
}
hdrs += client_handler_->get_ipaddr();
hdrs += "\r\n";
} else if (xff && !get_config()->strip_incoming_x_forwarded_for) {
hdrs += "X-Forwarded-For: ";
hdrs += (*xff).value;
hdrs += "\r\n";
}
if (!get_config()->http2_proxy && !get_config()->client_proxy &&
downstream_->get_request_method() != "CONNECT") {
hdrs += "X-Forwarded-Proto: ";
if (!downstream_->get_request_http2_scheme().empty()) {
hdrs += downstream_->get_request_http2_scheme();
hdrs += "\r\n";
} else if (client_handler_->get_ssl()) {
hdrs += "https\r\n";
} else {
hdrs += "http\r\n";
}
}
auto expect = downstream_->get_request_header(http2::HD_EXPECT);
if (expect && !util::strifind((*expect).value.c_str(), "100-continue")) {
hdrs += "Expect: ";
hdrs += (*expect).value;
hdrs += "\r\n";
}
auto via = downstream_->get_request_header(http2::HD_VIA);
if (get_config()->no_via) {
if (via) {
hdrs += "Via: ";
hdrs += (*via).value;
hdrs += "\r\n";
}
} else {
hdrs += "Via: ";
if (via) {
hdrs += (*via).value;
hdrs += ", ";
}
hdrs += http::create_via_header_value(downstream_->get_request_major(),
downstream_->get_request_minor());
hdrs += "\r\n";
}
hdrs += "\r\n";
if (LOG_ENABLED(INFO)) {
const char *hdrp;
std::string nhdrs;
if (log_config()->errorlog_tty) {
nhdrs = http::colorizeHeaders(hdrs.c_str());
hdrp = nhdrs.c_str();
} else {
hdrp = hdrs.c_str();
}
DCLOG(INFO, this) << "HTTP request headers. stream_id="
<< downstream_->get_stream_id() << "\n" << hdrp;
}
auto output = downstream_->get_request_buf();
output->append(hdrs.c_str(), hdrs.size());
signal_write();
return 0;
}
int HttpDownstreamConnection::push_upload_data_chunk(const uint8_t *data,
size_t datalen) {
auto chunked = downstream_->get_chunked_request();
auto output = downstream_->get_request_buf();
if (chunked) {
auto chunk_size_hex = util::utox(datalen);
output->append(chunk_size_hex.c_str(), chunk_size_hex.size());
output->append("\r\n");
}
output->append(data, datalen);
if (chunked) {
output->append("\r\n");
}
signal_write();
return 0;
}
int HttpDownstreamConnection::end_upload_data() {
if (!downstream_->get_chunked_request()) {
return 0;
}
auto output = downstream_->get_request_buf();
auto &trailers = downstream_->get_request_trailers();
if (trailers.empty()) {
output->append("0\r\n\r\n");
} else {
output->append("0\r\n");
std::string trailer_part;
http2::build_http1_headers_from_headers(trailer_part, trailers);
output->append(trailer_part.c_str(), trailer_part.size());
output->append("\r\n");
}
signal_write();
return 0;
}
namespace {
void idle_readcb(struct ev_loop *loop, ev_io *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "Idle connection EOF";
}
auto dconn_pool = dconn->get_dconn_pool();
dconn_pool->remove_downstream_connection(dconn);
// dconn was deleted
}
} // namespace
namespace {
void idle_timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) {
auto conn = static_cast<Connection *>(w->data);
auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, dconn) << "Idle connection timeout";
}
auto dconn_pool = dconn->get_dconn_pool();
dconn_pool->remove_downstream_connection(dconn);
// dconn was deleted
}
} // namespace
void HttpDownstreamConnection::detach_downstream(Downstream *downstream) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "Detaching from DOWNSTREAM:" << downstream;
}
downstream_ = nullptr;
ioctrl_.force_resume_read();
conn_.rlimit.startw();
conn_.wlimit.stopw();
ev_set_cb(&conn_.rev, idle_readcb);
ev_timer_stop(conn_.loop, &conn_.wt);
conn_.rt.repeat = get_config()->downstream_idle_read_timeout;
ev_set_cb(&conn_.rt, idle_timeoutcb);
ev_timer_again(conn_.loop, &conn_.rt);
}
void HttpDownstreamConnection::pause_read(IOCtrlReason reason) {
ioctrl_.pause_read(reason);
}
int HttpDownstreamConnection::resume_read(IOCtrlReason reason,
size_t consumed) {
if (!downstream_->response_buf_full()) {
ioctrl_.resume_read(reason);
}
return 0;
}
void HttpDownstreamConnection::force_resume_read() {
ioctrl_.force_resume_read();
}
namespace {
int htp_msg_begincb(http_parser *htp) {
auto downstream = static_cast<Downstream *>(htp->data);
if (downstream->get_response_state() != Downstream::INITIAL) {
return -1;
}
return 0;
}
} // namespace
namespace {
int htp_hdrs_completecb(http_parser *htp) {
auto downstream = static_cast<Downstream *>(htp->data);
auto upstream = downstream->get_upstream();
int rv;
downstream->set_response_http_status(htp->status_code);
downstream->set_response_major(htp->http_major);
downstream->set_response_minor(htp->http_minor);
if (downstream->index_response_headers() != 0) {
downstream->set_response_state(Downstream::MSG_BAD_HEADER);
return -1;
}
if (downstream->get_non_final_response()) {
// For non-final response code, we just call
// on_downstream_header_complete() without changing response
// state.
rv = upstream->on_downstream_header_complete(downstream);
if (rv != 0) {
return -1;
}
return 0;
}
downstream->set_response_connection_close(!http_should_keep_alive(htp));
downstream->set_response_state(Downstream::HEADER_COMPLETE);
downstream->inspect_http1_response();
downstream->check_upgrade_fulfilled();
if (downstream->get_upgraded()) {
downstream->set_response_connection_close(true);
}
if (upstream->on_downstream_header_complete(downstream) != 0) {
return -1;
}
if (downstream->get_upgraded()) {
// Upgrade complete, read until EOF in both ends
if (upstream->resume_read(SHRPX_NO_BUFFER, downstream, 0) != 0) {
return -1;
}
downstream->set_request_state(Downstream::HEADER_COMPLETE);
if (LOG_ENABLED(INFO)) {
LOG(INFO) << "HTTP upgrade success. stream_id="
<< downstream->get_stream_id();
}
}
unsigned int status = downstream->get_response_http_status();
// Ignore the response body. HEAD response may contain
// Content-Length or Transfer-Encoding: chunked. Some server send
// 304 status code with nonzero Content-Length, but without response
// body. See
// http://tools.ietf.org/html/draft-ietf-httpbis-p1-messaging-20#section-3.3
// TODO It seems that the cases other than HEAD are handled by
// http-parser. Need test.
return downstream->get_request_method() == "HEAD" ||
(100 <= status && status <= 199) || status == 204 ||
status == 304
? 1
: 0;
}
} // namespace
namespace {
int htp_hdr_keycb(http_parser *htp, const char *data, size_t len) {
auto downstream = static_cast<Downstream *>(htp->data);
if (downstream->get_response_state() == Downstream::INITIAL) {
if (downstream->get_response_header_key_prev()) {
downstream->append_last_response_header_key(data, len);
} else {
downstream->add_response_header(std::string(data, len), "");
}
} else {
// trailer part
if (downstream->get_response_trailer_key_prev()) {
downstream->append_last_response_trailer_key(data, len);
} else {
downstream->add_response_trailer(std::string(data, len), "");
}
}
if (downstream->get_response_headers_sum() > Downstream::MAX_HEADERS_SUM) {
if (LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "Too large header block size="
<< downstream->get_response_headers_sum();
}
return -1;
}
return 0;
}
} // namespace
namespace {
int htp_hdr_valcb(http_parser *htp, const char *data, size_t len) {
auto downstream = static_cast<Downstream *>(htp->data);
if (downstream->get_response_state() == Downstream::INITIAL) {
if (downstream->get_response_header_key_prev()) {
downstream->set_last_response_header_value(data, len);
} else {
downstream->append_last_response_header_value(data, len);
}
} else {
if (downstream->get_response_trailer_key_prev()) {
downstream->set_last_response_trailer_value(data, len);
} else {
downstream->append_last_response_trailer_value(data, len);
}
}
if (downstream->get_response_headers_sum() > Downstream::MAX_HEADERS_SUM) {
if (LOG_ENABLED(INFO)) {
DLOG(INFO, downstream) << "Too large header block size="
<< downstream->get_response_headers_sum();
}
return -1;
}
return 0;
}
} // namespace
namespace {
int htp_bodycb(http_parser *htp, const char *data, size_t len) {
auto downstream = static_cast<Downstream *>(htp->data);
downstream->add_response_bodylen(len);
return downstream->get_upstream()->on_downstream_body(
downstream, reinterpret_cast<const uint8_t *>(data), len, true);
}
} // namespace
namespace {
int htp_msg_completecb(http_parser *htp) {
auto downstream = static_cast<Downstream *>(htp->data);
if (downstream->get_non_final_response()) {
downstream->reset_response();
return 0;
}
downstream->set_response_state(Downstream::MSG_COMPLETE);
// Block reading another response message from (broken?)
// server. This callback is not called if the connection is
// tunneled.
downstream->pause_read(SHRPX_MSG_BLOCK);
return downstream->get_upstream()->on_downstream_body_complete(downstream);
}
} // namespace
namespace {
http_parser_settings htp_hooks = {
htp_msg_begincb, // http_cb on_message_begin;
nullptr, // http_data_cb on_url;
nullptr, // http_data_cb on_status;
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
int HttpDownstreamConnection::on_read() {
ev_timer_again(conn_.loop, &conn_.rt);
std::array<uint8_t, 8192> buf;
int rv;
if (downstream_->get_upgraded()) {
// For upgraded connection, just pass data to the upstream.
for (;;) {
auto nread = conn_.read_clear(buf.data(), buf.size());
if (nread == 0) {
return 0;
}
if (nread < 0) {
return nread;
}
rv = downstream_->get_upstream()->on_downstream_body(
downstream_, buf.data(), nread, true);
if (rv != 0) {
return rv;
}
if (downstream_->response_buf_full()) {
downstream_->pause_read(SHRPX_NO_BUFFER);
return 0;
}
}
}
for (;;) {
auto nread = conn_.read_clear(buf.data(), buf.size());
if (nread == 0) {
return 0;
}
if (nread < 0) {
return nread;
}
auto nproc =
http_parser_execute(&response_htp_, &htp_hooks,
reinterpret_cast<char *>(buf.data()), nread);
if (nproc != static_cast<size_t>(nread)) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "nproc != nread";
}
return -1;
}
auto htperr = HTTP_PARSER_ERRNO(&response_htp_);
if (htperr != HPE_OK) {
if (LOG_ENABLED(INFO)) {
DCLOG(INFO, this) << "HTTP parser failure: "
<< "(" << http_errno_name(htperr) << ") "
<< http_errno_description(htperr);
}
return -1;
}
if (downstream_->response_buf_full()) {
downstream_->pause_read(SHRPX_NO_BUFFER);
return 0;
}
}
}
int HttpDownstreamConnection::on_write() {
ev_timer_again(conn_.loop, &conn_.rt);
auto upstream = downstream_->get_upstream();
auto input = downstream_->get_request_buf();
std::array<struct iovec, MAX_WR_IOVCNT> iov;
while (input->rleft() > 0) {
auto iovcnt = input->riovec(iov.data(), iov.size());
auto nwrite = conn_.writev_clear(iov.data(), iovcnt);
if (nwrite == 0) {
return 0;
}
if (nwrite < 0) {
return nwrite;
}
input->drain(nwrite);
}
conn_.wlimit.stopw();
ev_timer_stop(conn_.loop, &conn_.wt);
if (input->rleft() == 0) {
upstream->resume_read(SHRPX_NO_BUFFER, downstream_,
downstream_->get_request_datalen());
}
return 0;
}
int HttpDownstreamConnection::on_connect() {
auto connect_blocker = client_handler_->get_connect_blocker();
if (!util::check_socket_connected(conn_.fd)) {
conn_.wlimit.stopw();
if (LOG_ENABLED(INFO)) {
DLOG(INFO, this) << "downstream connect failed";
}
return -1;
}
connect_blocker->on_success();
conn_.rlimit.startw();
ev_set_cb(&conn_.wev, writecb);
return 0;
}
void HttpDownstreamConnection::on_upstream_change(Upstream *upstream) {}
void HttpDownstreamConnection::signal_write() { conn_.wlimit.startw(); }
} // namespace shrpx
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