1 /*
2 * nghttp2 - HTTP/2 C Library
3 *
4 * Copyright (c) 2012 Tatsuhiro Tsujikawa
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining
7 * a copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sublicense, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be
15 * included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
18 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
19 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
20 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
21 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
22 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
23 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25 #include "shrpx_http_downstream_connection.h"
26
27 #include <openssl/rand.h>
28
29 #include "shrpx_client_handler.h"
30 #include "shrpx_upstream.h"
31 #include "shrpx_downstream.h"
32 #include "shrpx_config.h"
33 #include "shrpx_error.h"
34 #include "shrpx_http.h"
35 #include "shrpx_log_config.h"
36 #include "shrpx_connect_blocker.h"
37 #include "shrpx_downstream_connection_pool.h"
38 #include "shrpx_worker.h"
39 #include "shrpx_http2_session.h"
40 #include "shrpx_tls.h"
41 #include "shrpx_log.h"
42 #include "http2.h"
43 #include "util.h"
44 #include "ssl_compat.h"
45
46 using namespace nghttp2;
47
48 namespace shrpx {
49
50 namespace {
timeoutcb(struct ev_loop * loop,ev_timer * w,int revents)51 void timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) {
52 auto conn = static_cast<Connection *>(w->data);
53 auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
54
55 if (w == &conn->rt && !conn->expired_rt()) {
56 return;
57 }
58
59 if (LOG_ENABLED(INFO)) {
60 DCLOG(INFO, dconn) << "Time out";
61 }
62
63 auto downstream = dconn->get_downstream();
64 auto upstream = downstream->get_upstream();
65 auto handler = upstream->get_client_handler();
66 auto &resp = downstream->response();
67
68 // Do this so that dconn is not pooled
69 resp.connection_close = true;
70
71 if (upstream->downstream_error(dconn, Downstream::EVENT_TIMEOUT) != 0) {
72 delete handler;
73 }
74 }
75 } // namespace
76
77 namespace {
retry_downstream_connection(Downstream * downstream,unsigned int status_code)78 void retry_downstream_connection(Downstream *downstream,
79 unsigned int status_code) {
80 auto upstream = downstream->get_upstream();
81 auto handler = upstream->get_client_handler();
82
83 assert(!downstream->get_request_header_sent());
84
85 downstream->add_retry();
86
87 if (downstream->no_more_retry()) {
88 delete handler;
89 return;
90 }
91
92 downstream->pop_downstream_connection();
93 auto buf = downstream->get_request_buf();
94 buf->reset();
95
96 int rv;
97
98 for (;;) {
99 auto ndconn = handler->get_downstream_connection(rv, downstream);
100 if (!ndconn) {
101 break;
102 }
103 if (downstream->attach_downstream_connection(std::move(ndconn)) != 0) {
104 continue;
105 }
106 if (downstream->push_request_headers() == 0) {
107 return;
108 }
109 }
110
111 downstream->set_request_state(DownstreamState::CONNECT_FAIL);
112
113 if (rv == SHRPX_ERR_TLS_REQUIRED) {
114 rv = upstream->on_downstream_abort_request_with_https_redirect(downstream);
115 } else {
116 rv = upstream->on_downstream_abort_request(downstream, status_code);
117 }
118
119 if (rv != 0) {
120 delete handler;
121 }
122 }
123 } // namespace
124
125 namespace {
connect_timeoutcb(struct ev_loop * loop,ev_timer * w,int revents)126 void connect_timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) {
127 auto conn = static_cast<Connection *>(w->data);
128 auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
129 auto addr = dconn->get_addr();
130 auto raddr = dconn->get_raddr();
131
132 DCLOG(WARN, dconn) << "Connect time out; addr="
133 << util::to_numeric_addr(raddr);
134
135 downstream_failure(addr, raddr);
136
137 auto downstream = dconn->get_downstream();
138
139 retry_downstream_connection(downstream, 504);
140 }
141 } // namespace
142
143 namespace {
backend_retry(Downstream * downstream)144 void backend_retry(Downstream *downstream) {
145 retry_downstream_connection(downstream, 502);
146 }
147 } // namespace
148
149 namespace {
readcb(struct ev_loop * loop,ev_io * w,int revents)150 void readcb(struct ev_loop *loop, ev_io *w, int revents) {
151 int rv;
152 auto conn = static_cast<Connection *>(w->data);
153 auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
154 auto downstream = dconn->get_downstream();
155 auto upstream = downstream->get_upstream();
156 auto handler = upstream->get_client_handler();
157
158 rv = upstream->downstream_read(dconn);
159 if (rv != 0) {
160 if (rv == SHRPX_ERR_RETRY) {
161 backend_retry(downstream);
162 return;
163 }
164
165 delete handler;
166 }
167 }
168 } // namespace
169
170 namespace {
writecb(struct ev_loop * loop,ev_io * w,int revents)171 void writecb(struct ev_loop *loop, ev_io *w, int revents) {
172 int rv;
173 auto conn = static_cast<Connection *>(w->data);
174 auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
175 auto downstream = dconn->get_downstream();
176 auto upstream = downstream->get_upstream();
177 auto handler = upstream->get_client_handler();
178
179 rv = upstream->downstream_write(dconn);
180 if (rv == SHRPX_ERR_RETRY) {
181 backend_retry(downstream);
182 return;
183 }
184
185 if (rv != 0) {
186 delete handler;
187 }
188 }
189 } // namespace
190
191 namespace {
connectcb(struct ev_loop * loop,ev_io * w,int revents)192 void connectcb(struct ev_loop *loop, ev_io *w, int revents) {
193 auto conn = static_cast<Connection *>(w->data);
194 auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
195 auto downstream = dconn->get_downstream();
196 if (dconn->connected() != 0) {
197 backend_retry(downstream);
198 return;
199 }
200 writecb(loop, w, revents);
201 }
202 } // namespace
203
HttpDownstreamConnection(const std::shared_ptr<DownstreamAddrGroup> & group,DownstreamAddr * addr,struct ev_loop * loop,Worker * worker)204 HttpDownstreamConnection::HttpDownstreamConnection(
205 const std::shared_ptr<DownstreamAddrGroup> &group, DownstreamAddr *addr,
206 struct ev_loop *loop, Worker *worker)
207 : conn_(loop, -1, nullptr, worker->get_mcpool(),
208 group->shared_addr->timeout.write, group->shared_addr->timeout.read,
209 {}, {}, connectcb, readcb, connect_timeoutcb, this,
210 get_config()->tls.dyn_rec.warmup_threshold,
211 get_config()->tls.dyn_rec.idle_timeout, Proto::HTTP1),
212 on_read_(&HttpDownstreamConnection::noop),
213 on_write_(&HttpDownstreamConnection::noop),
214 signal_write_(&HttpDownstreamConnection::noop),
215 worker_(worker),
216 ssl_ctx_(worker->get_cl_ssl_ctx()),
217 group_(group),
218 addr_(addr),
219 raddr_(nullptr),
220 ioctrl_(&conn_.rlimit),
221 response_htp_{0},
222 first_write_done_(false),
223 reusable_(true),
224 request_header_written_(false) {}
225
~HttpDownstreamConnection()226 HttpDownstreamConnection::~HttpDownstreamConnection() {
227 if (LOG_ENABLED(INFO)) {
228 DCLOG(INFO, this) << "Deleted";
229 }
230
231 if (dns_query_) {
232 auto dns_tracker = worker_->get_dns_tracker();
233 dns_tracker->cancel(dns_query_.get());
234 }
235 }
236
attach_downstream(Downstream * downstream)237 int HttpDownstreamConnection::attach_downstream(Downstream *downstream) {
238 int rv;
239
240 if (LOG_ENABLED(INFO)) {
241 DCLOG(INFO, this) << "Attaching to DOWNSTREAM:" << downstream;
242 }
243
244 downstream_ = downstream;
245
246 rv = initiate_connection();
247 if (rv != 0) {
248 downstream_ = nullptr;
249 return rv;
250 }
251
252 return 0;
253 }
254
255 namespace {
256 int htp_msg_begincb(llhttp_t *htp);
257 int htp_hdr_keycb(llhttp_t *htp, const char *data, size_t len);
258 int htp_hdr_valcb(llhttp_t *htp, const char *data, size_t len);
259 int htp_hdrs_completecb(llhttp_t *htp);
260 int htp_bodycb(llhttp_t *htp, const char *data, size_t len);
261 int htp_msg_completecb(llhttp_t *htp);
262 } // namespace
263
264 namespace {
265 constexpr llhttp_settings_t htp_hooks = {
266 htp_msg_begincb, // llhttp_cb on_message_begin;
267 nullptr, // llhttp_data_cb on_url;
268 nullptr, // llhttp_data_cb on_status;
269 nullptr, // llhttp_data_cb on_method;
270 nullptr, // llhttp_data_cb on_version;
271 htp_hdr_keycb, // llhttp_data_cb on_header_field;
272 htp_hdr_valcb, // llhttp_data_cb on_header_value;
273 nullptr, // llhttp_data_cb on_chunk_extension_name;
274 nullptr, // llhttp_data_cb on_chunk_extension_value;
275 htp_hdrs_completecb, // llhttp_cb on_headers_complete;
276 htp_bodycb, // llhttp_data_cb on_body;
277 htp_msg_completecb, // llhttp_cb on_message_complete;
278 nullptr, // llhttp_cb on_url_complete;
279 nullptr, // llhttp_cb on_status_complete;
280 nullptr, // llhttp_cb on_method_complete;
281 nullptr, // llhttp_cb on_version_complete;
282 nullptr, // llhttp_cb on_header_field_complete;
283 nullptr, // llhttp_cb on_header_value_complete;
284 nullptr, // llhttp_cb on_chunk_extension_name_complete;
285 nullptr, // llhttp_cb on_chunk_extension_value_complete;
286 nullptr, // llhttp_cb on_chunk_header;
287 nullptr, // llhttp_cb on_chunk_complete;
288 nullptr, // llhttp_cb on_reset;
289 };
290 } // namespace
291
initiate_connection()292 int HttpDownstreamConnection::initiate_connection() {
293 int rv;
294
295 auto worker_blocker = worker_->get_connect_blocker();
296 if (worker_blocker->blocked()) {
297 if (LOG_ENABLED(INFO)) {
298 DCLOG(INFO, this)
299 << "Worker wide backend connection was blocked temporarily";
300 }
301 return SHRPX_ERR_NETWORK;
302 }
303
304 auto &downstreamconf = *worker_->get_downstream_config();
305
306 if (conn_.fd == -1) {
307 auto check_dns_result = dns_query_.get() != nullptr;
308
309 if (check_dns_result) {
310 assert(addr_->dns);
311 }
312
313 auto &connect_blocker = addr_->connect_blocker;
314
315 if (connect_blocker->blocked()) {
316 if (LOG_ENABLED(INFO)) {
317 DCLOG(INFO, this) << "Backend server " << addr_->host << ":"
318 << addr_->port << " was not available temporarily";
319 }
320
321 return SHRPX_ERR_NETWORK;
322 }
323
324 Address *raddr;
325
326 if (addr_->dns) {
327 if (!check_dns_result) {
328 auto dns_query = std::make_unique<DNSQuery>(
329 addr_->host,
330 [this](DNSResolverStatus status, const Address *result) {
331 int rv;
332
333 if (status == DNSResolverStatus::OK) {
334 *this->resolved_addr_ = *result;
335 }
336
337 rv = this->initiate_connection();
338 if (rv != 0) {
339 // This callback destroys |this|.
340 auto downstream = this->downstream_;
341 backend_retry(downstream);
342 }
343 });
344
345 auto dns_tracker = worker_->get_dns_tracker();
346
347 if (!resolved_addr_) {
348 resolved_addr_ = std::make_unique<Address>();
349 }
350 switch (dns_tracker->resolve(resolved_addr_.get(), dns_query.get())) {
351 case DNSResolverStatus::ERROR:
352 downstream_failure(addr_, nullptr);
353 return SHRPX_ERR_NETWORK;
354 case DNSResolverStatus::RUNNING:
355 dns_query_ = std::move(dns_query);
356 return 0;
357 case DNSResolverStatus::OK:
358 break;
359 default:
360 assert(0);
361 }
362 } else {
363 switch (dns_query_->status) {
364 case DNSResolverStatus::ERROR:
365 dns_query_.reset();
366 downstream_failure(addr_, nullptr);
367 return SHRPX_ERR_NETWORK;
368 case DNSResolverStatus::OK:
369 dns_query_.reset();
370 break;
371 default:
372 assert(0);
373 }
374 }
375
376 raddr = resolved_addr_.get();
377 util::set_port(*resolved_addr_, addr_->port);
378 } else {
379 raddr = &addr_->addr;
380 }
381
382 conn_.fd = util::create_nonblock_socket(raddr->su.storage.ss_family);
383
384 if (conn_.fd == -1) {
385 auto error = errno;
386 DCLOG(WARN, this) << "socket() failed; addr="
387 << util::to_numeric_addr(raddr) << ", errno=" << error;
388
389 worker_blocker->on_failure();
390
391 return SHRPX_ERR_NETWORK;
392 }
393
394 worker_blocker->on_success();
395
396 rv = connect(conn_.fd, &raddr->su.sa, raddr->len);
397 if (rv != 0 && errno != EINPROGRESS) {
398 auto error = errno;
399 DCLOG(WARN, this) << "connect() failed; addr="
400 << util::to_numeric_addr(raddr) << ", errno=" << error;
401
402 downstream_failure(addr_, raddr);
403
404 return SHRPX_ERR_NETWORK;
405 }
406
407 if (LOG_ENABLED(INFO)) {
408 DCLOG(INFO, this) << "Connecting to downstream server";
409 }
410
411 raddr_ = raddr;
412
413 if (addr_->tls) {
414 assert(ssl_ctx_);
415
416 auto ssl = tls::create_ssl(ssl_ctx_);
417 if (!ssl) {
418 return -1;
419 }
420
421 tls::setup_downstream_http1_alpn(ssl);
422
423 conn_.set_ssl(ssl);
424 conn_.tls.client_session_cache = &addr_->tls_session_cache;
425
426 auto sni_name =
427 addr_->sni.empty() ? StringRef{addr_->host} : StringRef{addr_->sni};
428 if (!util::numeric_host(sni_name.c_str())) {
429 SSL_set_tlsext_host_name(conn_.tls.ssl, sni_name.c_str());
430 }
431
432 auto session = tls::reuse_tls_session(addr_->tls_session_cache);
433 if (session) {
434 SSL_set_session(conn_.tls.ssl, session);
435 SSL_SESSION_free(session);
436 }
437
438 conn_.prepare_client_handshake();
439 }
440
441 ev_io_set(&conn_.wev, conn_.fd, EV_WRITE);
442 ev_io_set(&conn_.rev, conn_.fd, EV_READ);
443
444 conn_.wlimit.startw();
445
446 conn_.wt.repeat = downstreamconf.timeout.connect;
447 ev_timer_again(conn_.loop, &conn_.wt);
448 } else {
449 // we may set read timer cb to idle_timeoutcb. Reset again.
450 ev_set_cb(&conn_.rt, timeoutcb);
451 if (conn_.read_timeout < group_->shared_addr->timeout.read) {
452 conn_.read_timeout = group_->shared_addr->timeout.read;
453 conn_.last_read = std::chrono::steady_clock::now();
454 } else {
455 conn_.again_rt(group_->shared_addr->timeout.read);
456 }
457
458 ev_set_cb(&conn_.rev, readcb);
459
460 on_write_ = &HttpDownstreamConnection::write_first;
461 first_write_done_ = false;
462 request_header_written_ = false;
463 }
464
465 llhttp_init(&response_htp_, HTTP_RESPONSE, &htp_hooks);
466 response_htp_.data = downstream_;
467
468 return 0;
469 }
470
push_request_headers()471 int HttpDownstreamConnection::push_request_headers() {
472 if (request_header_written_) {
473 signal_write();
474 return 0;
475 }
476
477 const auto &downstream_hostport = addr_->hostport;
478 const auto &req = downstream_->request();
479
480 auto &balloc = downstream_->get_block_allocator();
481
482 auto connect_method = req.regular_connect_method();
483
484 auto config = get_config();
485 auto &httpconf = config->http;
486
487 request_header_written_ = true;
488
489 // For HTTP/1.0 request, there is no authority in request. In that
490 // case, we use backend server's host nonetheless.
491 auto authority = StringRef(downstream_hostport);
492 auto no_host_rewrite =
493 httpconf.no_host_rewrite || config->http2_proxy || connect_method;
494
495 if (no_host_rewrite && !req.authority.empty()) {
496 authority = req.authority;
497 }
498
499 downstream_->set_request_downstream_host(authority);
500
501 auto buf = downstream_->get_request_buf();
502
503 // Assume that method and request path do not contain \r\n.
504 auto meth = http2::to_method_string(
505 req.connect_proto == ConnectProto::WEBSOCKET ? HTTP_GET : req.method);
506 buf->append(meth);
507 buf->append(' ');
508
509 if (connect_method) {
510 buf->append(authority);
511 } else if (config->http2_proxy) {
512 // Construct absolute-form request target because we are going to
513 // send a request to a HTTP/1 proxy.
514 assert(!req.scheme.empty());
515 buf->append(req.scheme);
516 buf->append("://");
517 buf->append(authority);
518 buf->append(req.path);
519 } else if (req.method == HTTP_OPTIONS && req.path.empty()) {
520 // Server-wide OPTIONS
521 buf->append("*");
522 } else {
523 buf->append(req.path);
524 }
525 buf->append(" HTTP/1.1\r\nHost: ");
526 buf->append(authority);
527 buf->append("\r\n");
528
529 auto &fwdconf = httpconf.forwarded;
530 auto &xffconf = httpconf.xff;
531 auto &xfpconf = httpconf.xfp;
532 auto &earlydataconf = httpconf.early_data;
533
534 uint32_t build_flags =
535 (fwdconf.strip_incoming ? http2::HDOP_STRIP_FORWARDED : 0) |
536 (xffconf.strip_incoming ? http2::HDOP_STRIP_X_FORWARDED_FOR : 0) |
537 (xfpconf.strip_incoming ? http2::HDOP_STRIP_X_FORWARDED_PROTO : 0) |
538 (earlydataconf.strip_incoming ? http2::HDOP_STRIP_EARLY_DATA : 0) |
539 ((req.http_major == 3 || req.http_major == 2)
540 ? http2::HDOP_STRIP_SEC_WEBSOCKET_KEY
541 : 0);
542
543 http2::build_http1_headers_from_headers(buf, req.fs.headers(), build_flags);
544
545 auto cookie = downstream_->assemble_request_cookie();
546 if (!cookie.empty()) {
547 buf->append("Cookie: ");
548 buf->append(cookie);
549 buf->append("\r\n");
550 }
551
552 // set transfer-encoding only when content-length is unknown and
553 // request body is expected.
554 if (req.method != HTTP_CONNECT && req.http2_expect_body &&
555 req.fs.content_length == -1) {
556 downstream_->set_chunked_request(true);
557 buf->append("Transfer-Encoding: chunked\r\n");
558 }
559
560 if (req.connect_proto == ConnectProto::WEBSOCKET) {
561 if (req.http_major == 3 || req.http_major == 2) {
562 std::array<uint8_t, 16> nonce;
563 if (RAND_bytes(nonce.data(), nonce.size()) != 1) {
564 return -1;
565 }
566 auto iov = make_byte_ref(balloc, base64::encode_length(nonce.size()) + 1);
567 auto p = base64::encode(std::begin(nonce), std::end(nonce), iov.base);
568 *p = '\0';
569 auto key = StringRef{iov.base, p};
570 downstream_->set_ws_key(key);
571
572 buf->append("Sec-Websocket-Key: ");
573 buf->append(key);
574 buf->append("\r\n");
575 }
576
577 buf->append("Upgrade: websocket\r\nConnection: Upgrade\r\n");
578 } else if (!connect_method && req.upgrade_request) {
579 auto connection = req.fs.header(http2::HD_CONNECTION);
580 if (connection) {
581 buf->append("Connection: ");
582 buf->append((*connection).value);
583 buf->append("\r\n");
584 }
585
586 auto upgrade = req.fs.header(http2::HD_UPGRADE);
587 if (upgrade) {
588 buf->append("Upgrade: ");
589 buf->append((*upgrade).value);
590 buf->append("\r\n");
591 }
592 } else if (req.connection_close) {
593 buf->append("Connection: close\r\n");
594 }
595
596 auto upstream = downstream_->get_upstream();
597 auto handler = upstream->get_client_handler();
598
599 #if OPENSSL_1_1_1_API
600 auto conn = handler->get_connection();
601
602 if (conn->tls.ssl && !SSL_is_init_finished(conn->tls.ssl)) {
603 buf->append("Early-Data: 1\r\n");
604 }
605 #endif // OPENSSL_1_1_1_API
606
607 auto fwd =
608 fwdconf.strip_incoming ? nullptr : req.fs.header(http2::HD_FORWARDED);
609
610 if (fwdconf.params) {
611 auto params = fwdconf.params;
612
613 if (config->http2_proxy || connect_method) {
614 params &= ~FORWARDED_PROTO;
615 }
616
617 auto value = http::create_forwarded(
618 balloc, params, handler->get_forwarded_by(),
619 handler->get_forwarded_for(), req.authority, req.scheme);
620
621 if (fwd || !value.empty()) {
622 buf->append("Forwarded: ");
623 if (fwd) {
624 buf->append(fwd->value);
625
626 if (!value.empty()) {
627 buf->append(", ");
628 }
629 }
630 buf->append(value);
631 buf->append("\r\n");
632 }
633 } else if (fwd) {
634 buf->append("Forwarded: ");
635 buf->append(fwd->value);
636 buf->append("\r\n");
637 }
638
639 auto xff = xffconf.strip_incoming ? nullptr
640 : req.fs.header(http2::HD_X_FORWARDED_FOR);
641
642 if (xffconf.add) {
643 buf->append("X-Forwarded-For: ");
644 if (xff) {
645 buf->append((*xff).value);
646 buf->append(", ");
647 }
648 buf->append(client_handler_->get_ipaddr());
649 buf->append("\r\n");
650 } else if (xff) {
651 buf->append("X-Forwarded-For: ");
652 buf->append((*xff).value);
653 buf->append("\r\n");
654 }
655 if (!config->http2_proxy && !connect_method) {
656 auto xfp = xfpconf.strip_incoming
657 ? nullptr
658 : req.fs.header(http2::HD_X_FORWARDED_PROTO);
659
660 if (xfpconf.add) {
661 buf->append("X-Forwarded-Proto: ");
662 if (xfp) {
663 buf->append((*xfp).value);
664 buf->append(", ");
665 }
666 assert(!req.scheme.empty());
667 buf->append(req.scheme);
668 buf->append("\r\n");
669 } else if (xfp) {
670 buf->append("X-Forwarded-Proto: ");
671 buf->append((*xfp).value);
672 buf->append("\r\n");
673 }
674 }
675 auto via = req.fs.header(http2::HD_VIA);
676 if (httpconf.no_via) {
677 if (via) {
678 buf->append("Via: ");
679 buf->append((*via).value);
680 buf->append("\r\n");
681 }
682 } else {
683 buf->append("Via: ");
684 if (via) {
685 buf->append((*via).value);
686 buf->append(", ");
687 }
688 std::array<char, 16> viabuf;
689 auto end = http::create_via_header_value(viabuf.data(), req.http_major,
690 req.http_minor);
691 buf->append(viabuf.data(), end - viabuf.data());
692 buf->append("\r\n");
693 }
694
695 for (auto &p : httpconf.add_request_headers) {
696 buf->append(p.name);
697 buf->append(": ");
698 buf->append(p.value);
699 buf->append("\r\n");
700 }
701
702 buf->append("\r\n");
703
704 if (LOG_ENABLED(INFO)) {
705 std::string nhdrs;
706 for (auto chunk = buf->head; chunk; chunk = chunk->next) {
707 nhdrs.append(chunk->pos, chunk->last);
708 }
709 if (log_config()->errorlog_tty) {
710 nhdrs = http::colorizeHeaders(nhdrs.c_str());
711 }
712 DCLOG(INFO, this) << "HTTP request headers. stream_id="
713 << downstream_->get_stream_id() << "\n"
714 << nhdrs;
715 }
716
717 // Don't call signal_write() if we anticipate request body. We call
718 // signal_write() when we received request body chunk, and it
719 // enables us to send headers and data in one writev system call.
720 if (req.method == HTTP_CONNECT ||
721 downstream_->get_blocked_request_buf()->rleft() ||
722 (!req.http2_expect_body && req.fs.content_length == 0) ||
723 downstream_->get_expect_100_continue()) {
724 signal_write();
725 }
726
727 return 0;
728 }
729
process_blocked_request_buf()730 int HttpDownstreamConnection::process_blocked_request_buf() {
731 auto src = downstream_->get_blocked_request_buf();
732
733 if (src->rleft()) {
734 auto dest = downstream_->get_request_buf();
735 auto chunked = downstream_->get_chunked_request();
736 if (chunked) {
737 auto chunk_size_hex = util::utox(src->rleft());
738 dest->append(chunk_size_hex);
739 dest->append("\r\n");
740 }
741
742 src->copy(*dest);
743
744 if (chunked) {
745 dest->append("\r\n");
746 }
747 }
748
749 if (downstream_->get_blocked_request_data_eof() &&
750 downstream_->get_chunked_request()) {
751 end_upload_data_chunk();
752 }
753
754 return 0;
755 }
756
push_upload_data_chunk(const uint8_t * data,size_t datalen)757 int HttpDownstreamConnection::push_upload_data_chunk(const uint8_t *data,
758 size_t datalen) {
759 if (!downstream_->get_request_header_sent()) {
760 auto output = downstream_->get_blocked_request_buf();
761 auto &req = downstream_->request();
762 output->append(data, datalen);
763 req.unconsumed_body_length += datalen;
764 if (request_header_written_) {
765 signal_write();
766 }
767 return 0;
768 }
769
770 auto chunked = downstream_->get_chunked_request();
771 auto output = downstream_->get_request_buf();
772
773 if (chunked) {
774 auto chunk_size_hex = util::utox(datalen);
775 output->append(chunk_size_hex);
776 output->append("\r\n");
777 }
778
779 output->append(data, datalen);
780
781 if (chunked) {
782 output->append("\r\n");
783 }
784
785 signal_write();
786
787 return 0;
788 }
789
end_upload_data()790 int HttpDownstreamConnection::end_upload_data() {
791 if (!downstream_->get_request_header_sent()) {
792 downstream_->set_blocked_request_data_eof(true);
793 if (request_header_written_) {
794 signal_write();
795 }
796 return 0;
797 }
798
799 signal_write();
800
801 if (!downstream_->get_chunked_request()) {
802 return 0;
803 }
804
805 end_upload_data_chunk();
806
807 return 0;
808 }
809
end_upload_data_chunk()810 void HttpDownstreamConnection::end_upload_data_chunk() {
811 const auto &req = downstream_->request();
812
813 auto output = downstream_->get_request_buf();
814 const auto &trailers = req.fs.trailers();
815 if (trailers.empty()) {
816 output->append("0\r\n\r\n");
817 } else {
818 output->append("0\r\n");
819 http2::build_http1_headers_from_headers(output, trailers,
820 http2::HDOP_STRIP_ALL);
821 output->append("\r\n");
822 }
823 }
824
825 namespace {
remove_from_pool(HttpDownstreamConnection * dconn)826 void remove_from_pool(HttpDownstreamConnection *dconn) {
827 auto addr = dconn->get_addr();
828 auto &dconn_pool = addr->dconn_pool;
829 dconn_pool->remove_downstream_connection(dconn);
830 }
831 } // namespace
832
833 namespace {
idle_readcb(struct ev_loop * loop,ev_io * w,int revents)834 void idle_readcb(struct ev_loop *loop, ev_io *w, int revents) {
835 auto conn = static_cast<Connection *>(w->data);
836 auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
837 if (LOG_ENABLED(INFO)) {
838 DCLOG(INFO, dconn) << "Idle connection EOF";
839 }
840
841 remove_from_pool(dconn);
842 // dconn was deleted
843 }
844 } // namespace
845
846 namespace {
idle_timeoutcb(struct ev_loop * loop,ev_timer * w,int revents)847 void idle_timeoutcb(struct ev_loop *loop, ev_timer *w, int revents) {
848 auto conn = static_cast<Connection *>(w->data);
849 auto dconn = static_cast<HttpDownstreamConnection *>(conn->data);
850
851 if (w == &conn->rt && !conn->expired_rt()) {
852 return;
853 }
854
855 if (LOG_ENABLED(INFO)) {
856 DCLOG(INFO, dconn) << "Idle connection timeout";
857 }
858
859 remove_from_pool(dconn);
860 // dconn was deleted
861 }
862 } // namespace
863
detach_downstream(Downstream * downstream)864 void HttpDownstreamConnection::detach_downstream(Downstream *downstream) {
865 if (LOG_ENABLED(INFO)) {
866 DCLOG(INFO, this) << "Detaching from DOWNSTREAM:" << downstream;
867 }
868 downstream_ = nullptr;
869
870 ev_set_cb(&conn_.rev, idle_readcb);
871 ioctrl_.force_resume_read();
872
873 auto &downstreamconf = *worker_->get_downstream_config();
874
875 ev_set_cb(&conn_.rt, idle_timeoutcb);
876 if (conn_.read_timeout < downstreamconf.timeout.idle_read) {
877 conn_.read_timeout = downstreamconf.timeout.idle_read;
878 conn_.last_read = std::chrono::steady_clock::now();
879 } else {
880 conn_.again_rt(downstreamconf.timeout.idle_read);
881 }
882
883 conn_.wlimit.stopw();
884 ev_timer_stop(conn_.loop, &conn_.wt);
885 }
886
pause_read(IOCtrlReason reason)887 void HttpDownstreamConnection::pause_read(IOCtrlReason reason) {
888 ioctrl_.pause_read(reason);
889 }
890
resume_read(IOCtrlReason reason,size_t consumed)891 int HttpDownstreamConnection::resume_read(IOCtrlReason reason,
892 size_t consumed) {
893 auto &downstreamconf = *worker_->get_downstream_config();
894
895 if (downstream_->get_response_buf()->rleft() <=
896 downstreamconf.request_buffer_size / 2) {
897 ioctrl_.resume_read(reason);
898 }
899
900 return 0;
901 }
902
force_resume_read()903 void HttpDownstreamConnection::force_resume_read() {
904 ioctrl_.force_resume_read();
905 }
906
907 namespace {
htp_msg_begincb(llhttp_t * htp)908 int htp_msg_begincb(llhttp_t *htp) {
909 auto downstream = static_cast<Downstream *>(htp->data);
910
911 if (downstream->get_response_state() != DownstreamState::INITIAL) {
912 return -1;
913 }
914
915 return 0;
916 }
917 } // namespace
918
919 namespace {
htp_hdrs_completecb(llhttp_t * htp)920 int htp_hdrs_completecb(llhttp_t *htp) {
921 auto downstream = static_cast<Downstream *>(htp->data);
922 auto upstream = downstream->get_upstream();
923 auto handler = upstream->get_client_handler();
924 const auto &req = downstream->request();
925 auto &resp = downstream->response();
926 int rv;
927
928 auto &balloc = downstream->get_block_allocator();
929
930 for (auto &kv : resp.fs.headers()) {
931 kv.value = util::rstrip(balloc, kv.value);
932
933 if (kv.token == http2::HD_TRANSFER_ENCODING &&
934 !http2::check_transfer_encoding(kv.value)) {
935 return -1;
936 }
937 }
938
939 auto config = get_config();
940 auto &loggingconf = config->logging;
941
942 resp.http_status = htp->status_code;
943 resp.http_major = htp->http_major;
944 resp.http_minor = htp->http_minor;
945
946 if (resp.http_major > 1 || req.http_minor > 1) {
947 resp.http_major = 1;
948 resp.http_minor = 1;
949 return -1;
950 }
951
952 auto dconn = downstream->get_downstream_connection();
953
954 downstream->set_downstream_addr_group(dconn->get_downstream_addr_group());
955 downstream->set_addr(dconn->get_addr());
956
957 // Server MUST NOT send Transfer-Encoding with a status code 1xx or
958 // 204. Also server MUST NOT send Transfer-Encoding with a status
959 // code 2xx to a CONNECT request. Same holds true with
960 // Content-Length.
961 if (resp.http_status == 204) {
962 if (resp.fs.header(http2::HD_TRANSFER_ENCODING)) {
963 return -1;
964 }
965 // Some server send content-length: 0 for 204. Until they get
966 // fixed, we accept, but ignore it.
967
968 // Calling parse_content_length() detects duplicated
969 // content-length header fields.
970 if (resp.fs.parse_content_length() != 0) {
971 return -1;
972 }
973 if (resp.fs.content_length == 0) {
974 resp.fs.erase_content_length_and_transfer_encoding();
975 } else if (resp.fs.content_length != -1) {
976 return -1;
977 }
978 } else if (resp.http_status / 100 == 1 ||
979 (resp.http_status / 100 == 2 && req.method == HTTP_CONNECT)) {
980 // Server MUST NOT send Content-Length and Transfer-Encoding in
981 // these responses.
982 resp.fs.erase_content_length_and_transfer_encoding();
983 } else if (resp.fs.parse_content_length() != 0) {
984 downstream->set_response_state(DownstreamState::MSG_BAD_HEADER);
985 return -1;
986 }
987
988 // Check upgrade before processing non-final response, since if
989 // upgrade succeeded, 101 response is treated as final in nghttpx.
990 downstream->check_upgrade_fulfilled_http1();
991
992 if (downstream->get_non_final_response()) {
993 // Reset content-length because we reuse same Downstream for the
994 // next response.
995 resp.fs.content_length = -1;
996 // For non-final response code, we just call
997 // on_downstream_header_complete() without changing response
998 // state.
999 rv = upstream->on_downstream_header_complete(downstream);
1000
1001 if (rv != 0) {
1002 return -1;
1003 }
1004
1005 // Ignore response body for non-final response.
1006 return 1;
1007 }
1008
1009 resp.connection_close = !llhttp_should_keep_alive(htp);
1010 downstream->set_response_state(DownstreamState::HEADER_COMPLETE);
1011 downstream->inspect_http1_response();
1012
1013 if (htp->flags & F_CHUNKED) {
1014 downstream->set_chunked_response(true);
1015 }
1016
1017 auto transfer_encoding = resp.fs.header(http2::HD_TRANSFER_ENCODING);
1018 if (transfer_encoding && !downstream->get_chunked_response()) {
1019 resp.connection_close = true;
1020 }
1021
1022 if (downstream->get_upgraded()) {
1023 // content-length must be ignored for upgraded connection.
1024 resp.fs.content_length = -1;
1025 resp.connection_close = true;
1026 // transfer-encoding not applied to upgraded connection
1027 downstream->set_chunked_response(false);
1028 } else if (http2::legacy_http1(req.http_major, req.http_minor)) {
1029 if (resp.fs.content_length == -1) {
1030 resp.connection_close = true;
1031 }
1032 downstream->set_chunked_response(false);
1033 } else if (!downstream->expect_response_body()) {
1034 downstream->set_chunked_response(false);
1035 }
1036
1037 if (loggingconf.access.write_early && downstream->accesslog_ready()) {
1038 handler->write_accesslog(downstream);
1039 downstream->set_accesslog_written(true);
1040 }
1041
1042 if (upstream->on_downstream_header_complete(downstream) != 0) {
1043 return -1;
1044 }
1045
1046 if (downstream->get_upgraded()) {
1047 // Upgrade complete, read until EOF in both ends
1048 if (upstream->resume_read(SHRPX_NO_BUFFER, downstream, 0) != 0) {
1049 return -1;
1050 }
1051 downstream->set_request_state(DownstreamState::HEADER_COMPLETE);
1052 if (LOG_ENABLED(INFO)) {
1053 LOG(INFO) << "HTTP upgrade success. stream_id="
1054 << downstream->get_stream_id();
1055 }
1056 }
1057
1058 // Ignore the response body. HEAD response may contain
1059 // Content-Length or Transfer-Encoding: chunked. Some server send
1060 // 304 status code with nonzero Content-Length, but without response
1061 // body. See
1062 // https://tools.ietf.org/html/rfc7230#section-3.3
1063
1064 // TODO It seems that the cases other than HEAD are handled by
1065 // llhttp. Need test.
1066 return !http2::expect_response_body(req.method, resp.http_status);
1067 }
1068 } // namespace
1069
1070 namespace {
ensure_header_field_buffer(const Downstream * downstream,const HttpConfig & httpconf,size_t len)1071 int ensure_header_field_buffer(const Downstream *downstream,
1072 const HttpConfig &httpconf, size_t len) {
1073 auto &resp = downstream->response();
1074
1075 if (resp.fs.buffer_size() + len > httpconf.response_header_field_buffer) {
1076 if (LOG_ENABLED(INFO)) {
1077 DLOG(INFO, downstream) << "Too large header header field size="
1078 << resp.fs.buffer_size() + len;
1079 }
1080 return -1;
1081 }
1082
1083 return 0;
1084 }
1085 } // namespace
1086
1087 namespace {
ensure_max_header_fields(const Downstream * downstream,const HttpConfig & httpconf)1088 int ensure_max_header_fields(const Downstream *downstream,
1089 const HttpConfig &httpconf) {
1090 auto &resp = downstream->response();
1091
1092 if (resp.fs.num_fields() >= httpconf.max_response_header_fields) {
1093 if (LOG_ENABLED(INFO)) {
1094 DLOG(INFO, downstream)
1095 << "Too many header field num=" << resp.fs.num_fields() + 1;
1096 }
1097 return -1;
1098 }
1099
1100 return 0;
1101 }
1102 } // namespace
1103
1104 namespace {
htp_hdr_keycb(llhttp_t * htp,const char * data,size_t len)1105 int htp_hdr_keycb(llhttp_t *htp, const char *data, size_t len) {
1106 auto downstream = static_cast<Downstream *>(htp->data);
1107 auto &resp = downstream->response();
1108 auto &httpconf = get_config()->http;
1109
1110 if (ensure_header_field_buffer(downstream, httpconf, len) != 0) {
1111 return -1;
1112 }
1113
1114 if (downstream->get_response_state() == DownstreamState::INITIAL) {
1115 if (resp.fs.header_key_prev()) {
1116 resp.fs.append_last_header_key(data, len);
1117 } else {
1118 if (ensure_max_header_fields(downstream, httpconf) != 0) {
1119 return -1;
1120 }
1121 resp.fs.alloc_add_header_name(StringRef{data, len});
1122 }
1123 } else {
1124 // trailer part
1125 if (resp.fs.trailer_key_prev()) {
1126 resp.fs.append_last_trailer_key(data, len);
1127 } else {
1128 if (ensure_max_header_fields(downstream, httpconf) != 0) {
1129 // Could not ignore this trailer field easily, since we may
1130 // get its value in htp_hdr_valcb, and it will be added to
1131 // wrong place or crash if trailer fields are currently empty.
1132 return -1;
1133 }
1134 resp.fs.alloc_add_trailer_name(StringRef{data, len});
1135 }
1136 }
1137 return 0;
1138 }
1139 } // namespace
1140
1141 namespace {
htp_hdr_valcb(llhttp_t * htp,const char * data,size_t len)1142 int htp_hdr_valcb(llhttp_t *htp, const char *data, size_t len) {
1143 auto downstream = static_cast<Downstream *>(htp->data);
1144 auto &resp = downstream->response();
1145 auto &httpconf = get_config()->http;
1146
1147 if (ensure_header_field_buffer(downstream, httpconf, len) != 0) {
1148 return -1;
1149 }
1150
1151 if (downstream->get_response_state() == DownstreamState::INITIAL) {
1152 resp.fs.append_last_header_value(data, len);
1153 } else {
1154 resp.fs.append_last_trailer_value(data, len);
1155 }
1156 return 0;
1157 }
1158 } // namespace
1159
1160 namespace {
htp_bodycb(llhttp_t * htp,const char * data,size_t len)1161 int htp_bodycb(llhttp_t *htp, const char *data, size_t len) {
1162 auto downstream = static_cast<Downstream *>(htp->data);
1163 auto &resp = downstream->response();
1164
1165 resp.recv_body_length += len;
1166
1167 return downstream->get_upstream()->on_downstream_body(
1168 downstream, reinterpret_cast<const uint8_t *>(data), len, true);
1169 }
1170 } // namespace
1171
1172 namespace {
htp_msg_completecb(llhttp_t * htp)1173 int htp_msg_completecb(llhttp_t *htp) {
1174 auto downstream = static_cast<Downstream *>(htp->data);
1175 auto &resp = downstream->response();
1176 auto &balloc = downstream->get_block_allocator();
1177
1178 for (auto &kv : resp.fs.trailers()) {
1179 kv.value = util::rstrip(balloc, kv.value);
1180 }
1181
1182 // llhttp does not treat "200 connection established" response
1183 // against CONNECT request, and in that case, this function is not
1184 // called. But if HTTP Upgrade is made (e.g., WebSocket), this
1185 // function is called, and llhttp_execute() returns just after that.
1186 if (downstream->get_upgraded()) {
1187 return 0;
1188 }
1189
1190 if (downstream->get_non_final_response()) {
1191 downstream->reset_response();
1192
1193 return 0;
1194 }
1195
1196 downstream->set_response_state(DownstreamState::MSG_COMPLETE);
1197 // Block reading another response message from (broken?)
1198 // server. This callback is not called if the connection is
1199 // tunneled.
1200 downstream->pause_read(SHRPX_MSG_BLOCK);
1201 return downstream->get_upstream()->on_downstream_body_complete(downstream);
1202 }
1203 } // namespace
1204
write_first()1205 int HttpDownstreamConnection::write_first() {
1206 int rv;
1207
1208 process_blocked_request_buf();
1209
1210 if (conn_.tls.ssl) {
1211 rv = write_tls();
1212 } else {
1213 rv = write_clear();
1214 }
1215
1216 if (rv != 0) {
1217 return SHRPX_ERR_RETRY;
1218 }
1219
1220 if (conn_.tls.ssl) {
1221 on_write_ = &HttpDownstreamConnection::write_tls;
1222 } else {
1223 on_write_ = &HttpDownstreamConnection::write_clear;
1224 }
1225
1226 first_write_done_ = true;
1227 downstream_->set_request_header_sent(true);
1228
1229 auto buf = downstream_->get_blocked_request_buf();
1230 buf->reset();
1231
1232 // upstream->resume_read() might be called in
1233 // write_tls()/write_clear(), but before blocked_request_buf_ is
1234 // reset. So upstream read might still be blocked. Let's do it
1235 // again here.
1236 auto input = downstream_->get_request_buf();
1237 if (input->rleft() == 0) {
1238 auto upstream = downstream_->get_upstream();
1239 auto &req = downstream_->request();
1240
1241 upstream->resume_read(SHRPX_NO_BUFFER, downstream_,
1242 req.unconsumed_body_length);
1243 }
1244
1245 return 0;
1246 }
1247
read_clear()1248 int HttpDownstreamConnection::read_clear() {
1249 conn_.last_read = std::chrono::steady_clock::now();
1250
1251 std::array<uint8_t, 16_k> buf;
1252 int rv;
1253
1254 for (;;) {
1255 auto nread = conn_.read_clear(buf.data(), buf.size());
1256 if (nread == 0) {
1257 return 0;
1258 }
1259
1260 if (nread < 0) {
1261 if (nread == SHRPX_ERR_EOF && !downstream_->get_upgraded()) {
1262 auto htperr = llhttp_finish(&response_htp_);
1263 if (htperr != HPE_OK) {
1264 if (LOG_ENABLED(INFO)) {
1265 DCLOG(INFO, this) << "HTTP response ended prematurely: "
1266 << llhttp_errno_name(htperr);
1267 }
1268
1269 return -1;
1270 }
1271 }
1272
1273 return nread;
1274 }
1275
1276 rv = process_input(buf.data(), nread);
1277 if (rv != 0) {
1278 return rv;
1279 }
1280
1281 if (!ev_is_active(&conn_.rev)) {
1282 return 0;
1283 }
1284 }
1285 }
1286
write_clear()1287 int HttpDownstreamConnection::write_clear() {
1288 conn_.last_read = std::chrono::steady_clock::now();
1289
1290 auto upstream = downstream_->get_upstream();
1291 auto input = downstream_->get_request_buf();
1292
1293 std::array<struct iovec, MAX_WR_IOVCNT> iov;
1294
1295 while (input->rleft() > 0) {
1296 auto iovcnt = input->riovec(iov.data(), iov.size());
1297
1298 auto nwrite = conn_.writev_clear(iov.data(), iovcnt);
1299
1300 if (nwrite == 0) {
1301 return 0;
1302 }
1303
1304 if (nwrite < 0) {
1305 if (!first_write_done_) {
1306 return nwrite;
1307 }
1308 // We may have pending data in receive buffer which may contain
1309 // part of response body. So keep reading. Invoke read event
1310 // to get read(2) error just in case.
1311 ev_feed_event(conn_.loop, &conn_.rev, EV_READ);
1312 on_write_ = &HttpDownstreamConnection::noop;
1313 reusable_ = false;
1314 break;
1315 }
1316
1317 input->drain(nwrite);
1318 }
1319
1320 conn_.wlimit.stopw();
1321 ev_timer_stop(conn_.loop, &conn_.wt);
1322
1323 if (input->rleft() == 0) {
1324 auto &req = downstream_->request();
1325
1326 upstream->resume_read(SHRPX_NO_BUFFER, downstream_,
1327 req.unconsumed_body_length);
1328 }
1329
1330 return 0;
1331 }
1332
tls_handshake()1333 int HttpDownstreamConnection::tls_handshake() {
1334 ERR_clear_error();
1335
1336 conn_.last_read = std::chrono::steady_clock::now();
1337
1338 auto rv = conn_.tls_handshake();
1339 if (rv == SHRPX_ERR_INPROGRESS) {
1340 return 0;
1341 }
1342
1343 if (rv < 0) {
1344 downstream_failure(addr_, raddr_);
1345
1346 return rv;
1347 }
1348
1349 if (LOG_ENABLED(INFO)) {
1350 DCLOG(INFO, this) << "SSL/TLS handshake completed";
1351 }
1352
1353 if (!get_config()->tls.insecure &&
1354 tls::check_cert(conn_.tls.ssl, addr_, raddr_) != 0) {
1355 downstream_failure(addr_, raddr_);
1356
1357 return -1;
1358 }
1359
1360 auto &connect_blocker = addr_->connect_blocker;
1361
1362 signal_write_ = &HttpDownstreamConnection::actual_signal_write;
1363
1364 connect_blocker->on_success();
1365
1366 ev_set_cb(&conn_.rt, timeoutcb);
1367 ev_set_cb(&conn_.wt, timeoutcb);
1368
1369 on_read_ = &HttpDownstreamConnection::read_tls;
1370 on_write_ = &HttpDownstreamConnection::write_first;
1371
1372 // TODO Check negotiated ALPN
1373
1374 return on_write();
1375 }
1376
read_tls()1377 int HttpDownstreamConnection::read_tls() {
1378 conn_.last_read = std::chrono::steady_clock::now();
1379
1380 ERR_clear_error();
1381
1382 std::array<uint8_t, 16_k> buf;
1383 int rv;
1384
1385 for (;;) {
1386 auto nread = conn_.read_tls(buf.data(), buf.size());
1387 if (nread == 0) {
1388 return 0;
1389 }
1390
1391 if (nread < 0) {
1392 if (nread == SHRPX_ERR_EOF && !downstream_->get_upgraded()) {
1393 auto htperr = llhttp_finish(&response_htp_);
1394 if (htperr != HPE_OK) {
1395 if (LOG_ENABLED(INFO)) {
1396 DCLOG(INFO, this) << "HTTP response ended prematurely: "
1397 << llhttp_errno_name(htperr);
1398 }
1399
1400 return -1;
1401 }
1402 }
1403
1404 return nread;
1405 }
1406
1407 rv = process_input(buf.data(), nread);
1408 if (rv != 0) {
1409 return rv;
1410 }
1411
1412 if (!ev_is_active(&conn_.rev)) {
1413 return 0;
1414 }
1415 }
1416 }
1417
write_tls()1418 int HttpDownstreamConnection::write_tls() {
1419 conn_.last_read = std::chrono::steady_clock::now();
1420
1421 ERR_clear_error();
1422
1423 auto upstream = downstream_->get_upstream();
1424 auto input = downstream_->get_request_buf();
1425
1426 struct iovec iov;
1427
1428 while (input->rleft() > 0) {
1429 auto iovcnt = input->riovec(&iov, 1);
1430 if (iovcnt != 1) {
1431 assert(0);
1432 return -1;
1433 }
1434 auto nwrite = conn_.write_tls(iov.iov_base, iov.iov_len);
1435
1436 if (nwrite == 0) {
1437 return 0;
1438 }
1439
1440 if (nwrite < 0) {
1441 if (!first_write_done_) {
1442 return nwrite;
1443 }
1444 // We may have pending data in receive buffer which may contain
1445 // part of response body. So keep reading. Invoke read event
1446 // to get read(2) error just in case.
1447 ev_feed_event(conn_.loop, &conn_.rev, EV_READ);
1448 on_write_ = &HttpDownstreamConnection::noop;
1449 reusable_ = false;
1450 break;
1451 }
1452
1453 input->drain(nwrite);
1454 }
1455
1456 conn_.wlimit.stopw();
1457 ev_timer_stop(conn_.loop, &conn_.wt);
1458
1459 if (input->rleft() == 0) {
1460 auto &req = downstream_->request();
1461
1462 upstream->resume_read(SHRPX_NO_BUFFER, downstream_,
1463 req.unconsumed_body_length);
1464 }
1465
1466 return 0;
1467 }
1468
process_input(const uint8_t * data,size_t datalen)1469 int HttpDownstreamConnection::process_input(const uint8_t *data,
1470 size_t datalen) {
1471 int rv;
1472
1473 if (downstream_->get_upgraded()) {
1474 // For upgraded connection, just pass data to the upstream.
1475 rv = downstream_->get_upstream()->on_downstream_body(downstream_, data,
1476 datalen, true);
1477 if (rv != 0) {
1478 return rv;
1479 }
1480
1481 if (downstream_->response_buf_full()) {
1482 downstream_->pause_read(SHRPX_NO_BUFFER);
1483 return 0;
1484 }
1485
1486 return 0;
1487 }
1488
1489 auto htperr = llhttp_execute(&response_htp_,
1490 reinterpret_cast<const char *>(data), datalen);
1491 auto nproc =
1492 htperr == HPE_OK
1493 ? datalen
1494 : static_cast<size_t>(reinterpret_cast<const uint8_t *>(
1495 llhttp_get_error_pos(&response_htp_)) -
1496 data);
1497
1498 if (htperr != HPE_OK &&
1499 (!downstream_->get_upgraded() || htperr != HPE_PAUSED_UPGRADE)) {
1500 // Handling early return (in other words, response was hijacked by
1501 // mruby scripting).
1502 if (downstream_->get_response_state() == DownstreamState::MSG_COMPLETE) {
1503 return SHRPX_ERR_DCONN_CANCELED;
1504 }
1505
1506 if (LOG_ENABLED(INFO)) {
1507 DCLOG(INFO, this) << "HTTP parser failure: "
1508 << "(" << llhttp_errno_name(htperr) << ") "
1509 << llhttp_get_error_reason(&response_htp_);
1510 }
1511
1512 return -1;
1513 }
1514
1515 if (downstream_->get_upgraded()) {
1516 if (nproc < datalen) {
1517 // Data from data + nproc are for upgraded protocol.
1518 rv = downstream_->get_upstream()->on_downstream_body(
1519 downstream_, data + nproc, datalen - nproc, true);
1520 if (rv != 0) {
1521 return rv;
1522 }
1523
1524 if (downstream_->response_buf_full()) {
1525 downstream_->pause_read(SHRPX_NO_BUFFER);
1526 return 0;
1527 }
1528 }
1529 return 0;
1530 }
1531
1532 if (downstream_->response_buf_full()) {
1533 downstream_->pause_read(SHRPX_NO_BUFFER);
1534 return 0;
1535 }
1536
1537 return 0;
1538 }
1539
connected()1540 int HttpDownstreamConnection::connected() {
1541 auto &connect_blocker = addr_->connect_blocker;
1542
1543 auto sock_error = util::get_socket_error(conn_.fd);
1544 if (sock_error != 0) {
1545 conn_.wlimit.stopw();
1546
1547 DCLOG(WARN, this) << "Backend connect failed; addr="
1548 << util::to_numeric_addr(raddr_)
1549 << ": errno=" << sock_error;
1550
1551 downstream_failure(addr_, raddr_);
1552
1553 return -1;
1554 }
1555
1556 if (LOG_ENABLED(INFO)) {
1557 DCLOG(INFO, this) << "Connected to downstream host";
1558 }
1559
1560 // Reset timeout for write. Previously, we set timeout for connect.
1561 conn_.wt.repeat = group_->shared_addr->timeout.write;
1562 ev_timer_again(conn_.loop, &conn_.wt);
1563
1564 conn_.rlimit.startw();
1565 conn_.again_rt();
1566
1567 ev_set_cb(&conn_.wev, writecb);
1568
1569 if (conn_.tls.ssl) {
1570 on_read_ = &HttpDownstreamConnection::tls_handshake;
1571 on_write_ = &HttpDownstreamConnection::tls_handshake;
1572
1573 return 0;
1574 }
1575
1576 signal_write_ = &HttpDownstreamConnection::actual_signal_write;
1577
1578 connect_blocker->on_success();
1579
1580 ev_set_cb(&conn_.rt, timeoutcb);
1581 ev_set_cb(&conn_.wt, timeoutcb);
1582
1583 on_read_ = &HttpDownstreamConnection::read_clear;
1584 on_write_ = &HttpDownstreamConnection::write_first;
1585
1586 return 0;
1587 }
1588
on_read()1589 int HttpDownstreamConnection::on_read() { return on_read_(*this); }
1590
on_write()1591 int HttpDownstreamConnection::on_write() { return on_write_(*this); }
1592
on_upstream_change(Upstream * upstream)1593 void HttpDownstreamConnection::on_upstream_change(Upstream *upstream) {}
1594
signal_write()1595 void HttpDownstreamConnection::signal_write() { signal_write_(*this); }
1596
actual_signal_write()1597 int HttpDownstreamConnection::actual_signal_write() {
1598 ev_feed_event(conn_.loop, &conn_.wev, EV_WRITE);
1599 return 0;
1600 }
1601
noop()1602 int HttpDownstreamConnection::noop() { return 0; }
1603
1604 const std::shared_ptr<DownstreamAddrGroup> &
get_downstream_addr_group() const1605 HttpDownstreamConnection::get_downstream_addr_group() const {
1606 return group_;
1607 }
1608
get_addr() const1609 DownstreamAddr *HttpDownstreamConnection::get_addr() const { return addr_; }
1610
poolable() const1611 bool HttpDownstreamConnection::poolable() const {
1612 return !group_->retired && reusable_;
1613 }
1614
get_raddr() const1615 const Address *HttpDownstreamConnection::get_raddr() const { return raddr_; }
1616
1617 } // namespace shrpx
1618