1 /*
2 *
3 * Copyright 2015 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19 #include <grpc/support/port_platform.h>
20
21 #include <string.h>
22
23 #include "absl/strings/str_cat.h"
24 #include "absl/strings/str_format.h"
25
26 #include <grpc/support/alloc.h>
27 #include <grpc/support/log.h>
28
29 #include "src/core/ext/transport/chttp2/transport/internal.h"
30 #include "src/core/lib/profiling/timers.h"
31 #include "src/core/lib/slice/slice_string_helpers.h"
32 #include "src/core/lib/slice/slice_utils.h"
33 #include "src/core/lib/transport/http2_errors.h"
34 #include "src/core/lib/transport/static_metadata.h"
35 #include "src/core/lib/transport/status_conversion.h"
36 #include "src/core/lib/transport/timeout_encoding.h"
37
38 using grpc_core::HPackParser;
39
40 static grpc_error_handle init_frame_parser(grpc_chttp2_transport* t);
41 static grpc_error_handle init_header_frame_parser(grpc_chttp2_transport* t,
42 int is_continuation);
43 static grpc_error_handle init_data_frame_parser(grpc_chttp2_transport* t);
44 static grpc_error_handle init_rst_stream_parser(grpc_chttp2_transport* t);
45 static grpc_error_handle init_settings_frame_parser(grpc_chttp2_transport* t);
46 static grpc_error_handle init_window_update_frame_parser(
47 grpc_chttp2_transport* t);
48 static grpc_error_handle init_ping_parser(grpc_chttp2_transport* t);
49 static grpc_error_handle init_goaway_parser(grpc_chttp2_transport* t);
50 static grpc_error_handle init_non_header_skip_frame_parser(
51 grpc_chttp2_transport* t);
52
53 static grpc_error_handle parse_frame_slice(grpc_chttp2_transport* t,
54 const grpc_slice& slice,
55 int is_last);
56
grpc_chttp2_perform_read(grpc_chttp2_transport * t,const grpc_slice & slice)57 grpc_error_handle grpc_chttp2_perform_read(grpc_chttp2_transport* t,
58 const grpc_slice& slice) {
59 const uint8_t* beg = GRPC_SLICE_START_PTR(slice);
60 const uint8_t* end = GRPC_SLICE_END_PTR(slice);
61 const uint8_t* cur = beg;
62 grpc_error_handle err;
63
64 if (cur == end) return GRPC_ERROR_NONE;
65
66 switch (t->deframe_state) {
67 case GRPC_DTS_CLIENT_PREFIX_0:
68 case GRPC_DTS_CLIENT_PREFIX_1:
69 case GRPC_DTS_CLIENT_PREFIX_2:
70 case GRPC_DTS_CLIENT_PREFIX_3:
71 case GRPC_DTS_CLIENT_PREFIX_4:
72 case GRPC_DTS_CLIENT_PREFIX_5:
73 case GRPC_DTS_CLIENT_PREFIX_6:
74 case GRPC_DTS_CLIENT_PREFIX_7:
75 case GRPC_DTS_CLIENT_PREFIX_8:
76 case GRPC_DTS_CLIENT_PREFIX_9:
77 case GRPC_DTS_CLIENT_PREFIX_10:
78 case GRPC_DTS_CLIENT_PREFIX_11:
79 case GRPC_DTS_CLIENT_PREFIX_12:
80 case GRPC_DTS_CLIENT_PREFIX_13:
81 case GRPC_DTS_CLIENT_PREFIX_14:
82 case GRPC_DTS_CLIENT_PREFIX_15:
83 case GRPC_DTS_CLIENT_PREFIX_16:
84 case GRPC_DTS_CLIENT_PREFIX_17:
85 case GRPC_DTS_CLIENT_PREFIX_18:
86 case GRPC_DTS_CLIENT_PREFIX_19:
87 case GRPC_DTS_CLIENT_PREFIX_20:
88 case GRPC_DTS_CLIENT_PREFIX_21:
89 case GRPC_DTS_CLIENT_PREFIX_22:
90 case GRPC_DTS_CLIENT_PREFIX_23:
91 while (cur != end && t->deframe_state != GRPC_DTS_FH_0) {
92 if (*cur != GRPC_CHTTP2_CLIENT_CONNECT_STRING[t->deframe_state]) {
93 return GRPC_ERROR_CREATE_FROM_CPP_STRING(absl::StrFormat(
94 "Connect string mismatch: expected '%c' (%d) got '%c' (%d) "
95 "at byte %d",
96 GRPC_CHTTP2_CLIENT_CONNECT_STRING[t->deframe_state],
97 static_cast<int>(static_cast<uint8_t>(
98 GRPC_CHTTP2_CLIENT_CONNECT_STRING[t->deframe_state])),
99 *cur, static_cast<int>(*cur), t->deframe_state));
100 }
101 ++cur;
102 // NOLINTNEXTLINE(bugprone-misplaced-widening-cast)
103 t->deframe_state = static_cast<grpc_chttp2_deframe_transport_state>(
104 1 + static_cast<int>(t->deframe_state));
105 }
106 if (cur == end) {
107 return GRPC_ERROR_NONE;
108 }
109 dts_fh_0:
110 ABSL_FALLTHROUGH_INTENDED;
111 case GRPC_DTS_FH_0:
112 GPR_DEBUG_ASSERT(cur < end);
113 t->incoming_frame_size = (static_cast<uint32_t>(*cur)) << 16;
114 if (++cur == end) {
115 t->deframe_state = GRPC_DTS_FH_1;
116 return GRPC_ERROR_NONE;
117 }
118 ABSL_FALLTHROUGH_INTENDED;
119 case GRPC_DTS_FH_1:
120 GPR_DEBUG_ASSERT(cur < end);
121 t->incoming_frame_size |= (static_cast<uint32_t>(*cur)) << 8;
122 if (++cur == end) {
123 t->deframe_state = GRPC_DTS_FH_2;
124 return GRPC_ERROR_NONE;
125 }
126 ABSL_FALLTHROUGH_INTENDED;
127 case GRPC_DTS_FH_2:
128 GPR_DEBUG_ASSERT(cur < end);
129 t->incoming_frame_size |= *cur;
130 if (++cur == end) {
131 t->deframe_state = GRPC_DTS_FH_3;
132 return GRPC_ERROR_NONE;
133 }
134 ABSL_FALLTHROUGH_INTENDED;
135 case GRPC_DTS_FH_3:
136 GPR_DEBUG_ASSERT(cur < end);
137 t->incoming_frame_type = *cur;
138 if (++cur == end) {
139 t->deframe_state = GRPC_DTS_FH_4;
140 return GRPC_ERROR_NONE;
141 }
142 ABSL_FALLTHROUGH_INTENDED;
143 case GRPC_DTS_FH_4:
144 GPR_DEBUG_ASSERT(cur < end);
145 t->incoming_frame_flags = *cur;
146 if (++cur == end) {
147 t->deframe_state = GRPC_DTS_FH_5;
148 return GRPC_ERROR_NONE;
149 }
150 ABSL_FALLTHROUGH_INTENDED;
151 case GRPC_DTS_FH_5:
152 GPR_DEBUG_ASSERT(cur < end);
153 t->incoming_stream_id = ((static_cast<uint32_t>(*cur)) & 0x7f) << 24;
154 if (++cur == end) {
155 t->deframe_state = GRPC_DTS_FH_6;
156 return GRPC_ERROR_NONE;
157 }
158 ABSL_FALLTHROUGH_INTENDED;
159 case GRPC_DTS_FH_6:
160 GPR_DEBUG_ASSERT(cur < end);
161 t->incoming_stream_id |= (static_cast<uint32_t>(*cur)) << 16;
162 if (++cur == end) {
163 t->deframe_state = GRPC_DTS_FH_7;
164 return GRPC_ERROR_NONE;
165 }
166 ABSL_FALLTHROUGH_INTENDED;
167 case GRPC_DTS_FH_7:
168 GPR_DEBUG_ASSERT(cur < end);
169 t->incoming_stream_id |= (static_cast<uint32_t>(*cur)) << 8;
170 if (++cur == end) {
171 t->deframe_state = GRPC_DTS_FH_8;
172 return GRPC_ERROR_NONE;
173 }
174 ABSL_FALLTHROUGH_INTENDED;
175 case GRPC_DTS_FH_8:
176 GPR_DEBUG_ASSERT(cur < end);
177 t->incoming_stream_id |= (static_cast<uint32_t>(*cur));
178 t->deframe_state = GRPC_DTS_FRAME;
179 err = init_frame_parser(t);
180 if (err != GRPC_ERROR_NONE) {
181 return err;
182 }
183 if (t->incoming_frame_size == 0) {
184 err = parse_frame_slice(t, grpc_empty_slice(), 1);
185 if (err != GRPC_ERROR_NONE) {
186 return err;
187 }
188 t->incoming_stream = nullptr;
189 if (++cur == end) {
190 t->deframe_state = GRPC_DTS_FH_0;
191 return GRPC_ERROR_NONE;
192 }
193 goto dts_fh_0; /* loop */
194 } else if (t->flow_control->flow_control_enabled() &&
195 t->incoming_frame_size >
196 t->settings[GRPC_ACKED_SETTINGS]
197 [GRPC_CHTTP2_SETTINGS_MAX_FRAME_SIZE]) {
198 return GRPC_ERROR_CREATE_FROM_CPP_STRING(
199 absl::StrFormat("Frame size %d is larger than max frame size %d",
200 t->incoming_frame_size,
201 t->settings[GRPC_ACKED_SETTINGS]
202 [GRPC_CHTTP2_SETTINGS_MAX_FRAME_SIZE]));
203 }
204 if (++cur == end) {
205 return GRPC_ERROR_NONE;
206 }
207 ABSL_FALLTHROUGH_INTENDED;
208 case GRPC_DTS_FRAME:
209 GPR_DEBUG_ASSERT(cur < end);
210 if (static_cast<uint32_t>(end - cur) == t->incoming_frame_size) {
211 err = parse_frame_slice(
212 t,
213 grpc_slice_sub_no_ref(slice, static_cast<size_t>(cur - beg),
214 static_cast<size_t>(end - beg)),
215 1);
216 if (err != GRPC_ERROR_NONE) {
217 return err;
218 }
219 t->deframe_state = GRPC_DTS_FH_0;
220 t->incoming_stream = nullptr;
221 return GRPC_ERROR_NONE;
222 } else if (static_cast<uint32_t>(end - cur) > t->incoming_frame_size) {
223 size_t cur_offset = static_cast<size_t>(cur - beg);
224 err = parse_frame_slice(
225 t,
226 grpc_slice_sub_no_ref(slice, cur_offset,
227 cur_offset + t->incoming_frame_size),
228 1);
229 if (err != GRPC_ERROR_NONE) {
230 return err;
231 }
232 cur += t->incoming_frame_size;
233 t->incoming_stream = nullptr;
234 goto dts_fh_0; /* loop */
235 } else {
236 err = parse_frame_slice(
237 t,
238 grpc_slice_sub_no_ref(slice, static_cast<size_t>(cur - beg),
239 static_cast<size_t>(end - beg)),
240 0);
241 if (err != GRPC_ERROR_NONE) {
242 return err;
243 }
244 t->incoming_frame_size -= static_cast<uint32_t>(end - cur);
245 return GRPC_ERROR_NONE;
246 }
247 GPR_UNREACHABLE_CODE(return GRPC_ERROR_NONE);
248 }
249
250 GPR_UNREACHABLE_CODE(return GRPC_ERROR_NONE);
251 }
252
init_frame_parser(grpc_chttp2_transport * t)253 static grpc_error_handle init_frame_parser(grpc_chttp2_transport* t) {
254 if (t->is_first_frame &&
255 t->incoming_frame_type != GRPC_CHTTP2_FRAME_SETTINGS) {
256 return GRPC_ERROR_CREATE_FROM_CPP_STRING(absl::StrCat(
257 "Expected SETTINGS frame as the first frame, got frame type ",
258 t->incoming_frame_type));
259 }
260 t->is_first_frame = false;
261 if (t->expect_continuation_stream_id != 0) {
262 if (t->incoming_frame_type != GRPC_CHTTP2_FRAME_CONTINUATION) {
263 return GRPC_ERROR_CREATE_FROM_CPP_STRING(
264 absl::StrFormat("Expected CONTINUATION frame, got frame type %02x",
265 t->incoming_frame_type));
266 }
267 if (t->expect_continuation_stream_id != t->incoming_stream_id) {
268 return GRPC_ERROR_CREATE_FROM_CPP_STRING(absl::StrFormat(
269 "Expected CONTINUATION frame for grpc_chttp2_stream %08x, got "
270 "grpc_chttp2_stream %08x",
271 t->expect_continuation_stream_id, t->incoming_stream_id));
272 }
273 return init_header_frame_parser(t, 1);
274 }
275 switch (t->incoming_frame_type) {
276 case GRPC_CHTTP2_FRAME_DATA:
277 return init_data_frame_parser(t);
278 case GRPC_CHTTP2_FRAME_HEADER:
279 return init_header_frame_parser(t, 0);
280 case GRPC_CHTTP2_FRAME_CONTINUATION:
281 return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
282 "Unexpected CONTINUATION frame");
283 case GRPC_CHTTP2_FRAME_RST_STREAM:
284 return init_rst_stream_parser(t);
285 case GRPC_CHTTP2_FRAME_SETTINGS:
286 return init_settings_frame_parser(t);
287 case GRPC_CHTTP2_FRAME_WINDOW_UPDATE:
288 return init_window_update_frame_parser(t);
289 case GRPC_CHTTP2_FRAME_PING:
290 return init_ping_parser(t);
291 case GRPC_CHTTP2_FRAME_GOAWAY:
292 return init_goaway_parser(t);
293 default:
294 if (GRPC_TRACE_FLAG_ENABLED(grpc_http_trace)) {
295 gpr_log(GPR_ERROR, "Unknown frame type %02x", t->incoming_frame_type);
296 }
297 return init_non_header_skip_frame_parser(t);
298 }
299 }
300
skip_parser(void *,grpc_chttp2_transport *,grpc_chttp2_stream *,const grpc_slice &,int)301 static grpc_error_handle skip_parser(void* /*parser*/,
302 grpc_chttp2_transport* /*t*/,
303 grpc_chttp2_stream* /*s*/,
304 const grpc_slice& /*slice*/,
305 int /*is_last*/) {
306 return GRPC_ERROR_NONE;
307 }
308
skip_header(grpc_mdelem md)309 grpc_error_handle skip_header(grpc_mdelem md) {
310 GRPC_MDELEM_UNREF(md);
311 return GRPC_ERROR_NONE;
312 }
313
hpack_boundary_type(grpc_chttp2_transport * t,bool is_eoh)314 static HPackParser::Boundary hpack_boundary_type(grpc_chttp2_transport* t,
315 bool is_eoh) {
316 if (is_eoh) {
317 if (t->header_eof) {
318 return HPackParser::Boundary::EndOfStream;
319 } else {
320 return HPackParser::Boundary::EndOfHeaders;
321 }
322 } else {
323 return HPackParser::Boundary::None;
324 }
325 }
326
hpack_parser_log_info(grpc_chttp2_transport * t,HPackParser::LogInfo::Type type)327 static HPackParser::LogInfo hpack_parser_log_info(
328 grpc_chttp2_transport* t, HPackParser::LogInfo::Type type) {
329 return HPackParser::LogInfo{
330 t->incoming_stream_id,
331 type,
332 t->is_client,
333 };
334 }
335
init_header_skip_frame_parser(grpc_chttp2_transport * t,HPackParser::Priority priority_type)336 static grpc_error_handle init_header_skip_frame_parser(
337 grpc_chttp2_transport* t, HPackParser::Priority priority_type) {
338 bool is_eoh = t->expect_continuation_stream_id != 0;
339 t->parser = grpc_chttp2_header_parser_parse;
340 t->parser_data = &t->hpack_parser;
341 t->hpack_parser.BeginFrame(
342 nullptr,
343 t->settings[GRPC_ACKED_SETTINGS]
344 [GRPC_CHTTP2_SETTINGS_MAX_HEADER_LIST_SIZE],
345 hpack_boundary_type(t, is_eoh), priority_type,
346 hpack_parser_log_info(t, HPackParser::LogInfo::kDontKnow));
347 return GRPC_ERROR_NONE;
348 }
349
init_non_header_skip_frame_parser(grpc_chttp2_transport * t)350 static grpc_error_handle init_non_header_skip_frame_parser(
351 grpc_chttp2_transport* t) {
352 t->parser = skip_parser;
353 return GRPC_ERROR_NONE;
354 }
355
grpc_chttp2_parsing_become_skip_parser(grpc_chttp2_transport * t)356 void grpc_chttp2_parsing_become_skip_parser(grpc_chttp2_transport* t) {
357 if (t->parser == grpc_chttp2_header_parser_parse) {
358 t->hpack_parser.StopBufferingFrame();
359 } else {
360 t->parser = skip_parser;
361 }
362 }
363
init_data_frame_parser(grpc_chttp2_transport * t)364 static grpc_error_handle init_data_frame_parser(grpc_chttp2_transport* t) {
365 // Update BDP accounting since we have received a data frame.
366 grpc_core::BdpEstimator* bdp_est = t->flow_control->bdp_estimator();
367 if (bdp_est) {
368 if (t->bdp_ping_blocked) {
369 t->bdp_ping_blocked = false;
370 GRPC_CHTTP2_REF_TRANSPORT(t, "bdp_ping");
371 schedule_bdp_ping_locked(t);
372 }
373 bdp_est->AddIncomingBytes(t->incoming_frame_size);
374 }
375 grpc_chttp2_stream* s =
376 grpc_chttp2_parsing_lookup_stream(t, t->incoming_stream_id);
377 grpc_error_handle err = GRPC_ERROR_NONE;
378 grpc_core::chttp2::FlowControlAction action;
379 if (s == nullptr) {
380 err = t->flow_control->RecvData(t->incoming_frame_size);
381 action = t->flow_control->MakeAction();
382 } else {
383 err = s->flow_control->RecvData(t->incoming_frame_size);
384 action = s->flow_control->MakeAction();
385 }
386 grpc_chttp2_act_on_flowctl_action(action, t, s);
387 if (err != GRPC_ERROR_NONE) {
388 goto error_handler;
389 }
390 if (s == nullptr) {
391 return init_non_header_skip_frame_parser(t);
392 }
393 s->received_bytes += t->incoming_frame_size;
394 s->stats.incoming.framing_bytes += 9;
395 if (err == GRPC_ERROR_NONE && s->read_closed) {
396 return init_non_header_skip_frame_parser(t);
397 }
398 if (err == GRPC_ERROR_NONE) {
399 err = grpc_chttp2_data_parser_begin_frame(
400 &s->data_parser, t->incoming_frame_flags, s->id, s);
401 }
402 error_handler:
403 intptr_t unused;
404 if (err == GRPC_ERROR_NONE) {
405 t->incoming_stream = s;
406 /* t->parser = grpc_chttp2_data_parser_parse;*/
407 t->parser = grpc_chttp2_data_parser_parse;
408 t->parser_data = &s->data_parser;
409 t->ping_state.last_ping_sent_time = GRPC_MILLIS_INF_PAST;
410 return GRPC_ERROR_NONE;
411 } else if (grpc_error_get_int(err, GRPC_ERROR_INT_STREAM_ID, &unused)) {
412 /* handle stream errors by closing the stream */
413 if (s != nullptr) {
414 grpc_chttp2_mark_stream_closed(t, s, true, false, err);
415 }
416 grpc_chttp2_add_rst_stream_to_next_write(t, t->incoming_stream_id,
417 GRPC_HTTP2_PROTOCOL_ERROR,
418 &s->stats.outgoing);
419 return init_non_header_skip_frame_parser(t);
420 } else {
421 return err;
422 }
423 }
424
init_header_frame_parser(grpc_chttp2_transport * t,int is_continuation)425 static grpc_error_handle init_header_frame_parser(grpc_chttp2_transport* t,
426 int is_continuation) {
427 const bool is_eoh =
428 (t->incoming_frame_flags & GRPC_CHTTP2_DATA_FLAG_END_HEADERS) != 0;
429 grpc_chttp2_stream* s;
430
431 /* TODO(ctiller): when to increment header_frames_received? */
432
433 if (is_eoh) {
434 t->expect_continuation_stream_id = 0;
435 } else {
436 t->expect_continuation_stream_id = t->incoming_stream_id;
437 }
438
439 if (!is_continuation) {
440 t->header_eof =
441 (t->incoming_frame_flags & GRPC_CHTTP2_DATA_FLAG_END_STREAM) != 0;
442 }
443
444 const auto priority_type = !is_continuation && (t->incoming_frame_flags &
445 GRPC_CHTTP2_FLAG_HAS_PRIORITY)
446 ? HPackParser::Priority::Included
447 : HPackParser::Priority::None;
448
449 t->ping_state.last_ping_sent_time = GRPC_MILLIS_INF_PAST;
450
451 /* could be a new grpc_chttp2_stream or an existing grpc_chttp2_stream */
452 s = grpc_chttp2_parsing_lookup_stream(t, t->incoming_stream_id);
453 if (s == nullptr) {
454 if (GPR_UNLIKELY(is_continuation)) {
455 GRPC_CHTTP2_IF_TRACING(
456 gpr_log(GPR_ERROR,
457 "grpc_chttp2_stream disbanded before CONTINUATION received"));
458 return init_header_skip_frame_parser(t, priority_type);
459 }
460 if (t->is_client) {
461 if (GPR_LIKELY((t->incoming_stream_id & 1) &&
462 t->incoming_stream_id < t->next_stream_id)) {
463 /* this is an old (probably cancelled) grpc_chttp2_stream */
464 } else {
465 GRPC_CHTTP2_IF_TRACING(gpr_log(
466 GPR_ERROR, "ignoring new grpc_chttp2_stream creation on client"));
467 }
468 return init_header_skip_frame_parser(t, priority_type);
469 } else if (GPR_UNLIKELY(t->last_new_stream_id >= t->incoming_stream_id)) {
470 GRPC_CHTTP2_IF_TRACING(gpr_log(
471 GPR_ERROR,
472 "ignoring out of order new grpc_chttp2_stream request on server; "
473 "last grpc_chttp2_stream "
474 "id=%d, new grpc_chttp2_stream id=%d",
475 t->last_new_stream_id, t->incoming_stream_id));
476 return init_header_skip_frame_parser(t, priority_type);
477 } else if (GPR_UNLIKELY((t->incoming_stream_id & 1) == 0)) {
478 GRPC_CHTTP2_IF_TRACING(gpr_log(
479 GPR_ERROR,
480 "ignoring grpc_chttp2_stream with non-client generated index %d",
481 t->incoming_stream_id));
482 return init_header_skip_frame_parser(t, priority_type);
483 } else if (GPR_UNLIKELY(
484 grpc_chttp2_stream_map_size(&t->stream_map) >=
485 t->settings[GRPC_ACKED_SETTINGS]
486 [GRPC_CHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS])) {
487 return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Max stream count exceeded");
488 }
489 t->last_new_stream_id = t->incoming_stream_id;
490 s = t->incoming_stream =
491 grpc_chttp2_parsing_accept_stream(t, t->incoming_stream_id);
492 if (GPR_UNLIKELY(s == nullptr)) {
493 GRPC_CHTTP2_IF_TRACING(
494 gpr_log(GPR_ERROR, "grpc_chttp2_stream not accepted"));
495 return init_header_skip_frame_parser(t, priority_type);
496 }
497 if (t->channelz_socket != nullptr) {
498 t->channelz_socket->RecordStreamStartedFromRemote();
499 }
500 } else {
501 t->incoming_stream = s;
502 }
503 GPR_DEBUG_ASSERT(s != nullptr);
504 s->stats.incoming.framing_bytes += 9;
505 if (GPR_UNLIKELY(s->read_closed)) {
506 GRPC_CHTTP2_IF_TRACING(gpr_log(
507 GPR_ERROR, "skipping already closed grpc_chttp2_stream header"));
508 t->incoming_stream = nullptr;
509 return init_header_skip_frame_parser(t, priority_type);
510 }
511 t->parser = grpc_chttp2_header_parser_parse;
512 t->parser_data = &t->hpack_parser;
513 if (t->header_eof) {
514 s->eos_received = true;
515 }
516 grpc_metadata_batch* incoming_metadata_buffer = nullptr;
517 HPackParser::LogInfo::Type frame_type = HPackParser::LogInfo::kDontKnow;
518 switch (s->header_frames_received) {
519 case 0:
520 if (t->is_client && t->header_eof) {
521 GRPC_CHTTP2_IF_TRACING(gpr_log(GPR_INFO, "parsing Trailers-Only"));
522 if (s->trailing_metadata_available != nullptr) {
523 *s->trailing_metadata_available = true;
524 }
525 incoming_metadata_buffer = &s->trailing_metadata_buffer;
526 frame_type = HPackParser::LogInfo::kTrailers;
527 } else {
528 GRPC_CHTTP2_IF_TRACING(gpr_log(GPR_INFO, "parsing initial_metadata"));
529 incoming_metadata_buffer = &s->initial_metadata_buffer;
530 frame_type = HPackParser::LogInfo::kHeaders;
531 }
532 break;
533 case 1:
534 GRPC_CHTTP2_IF_TRACING(gpr_log(GPR_INFO, "parsing trailing_metadata"));
535 incoming_metadata_buffer = &s->trailing_metadata_buffer;
536 frame_type = HPackParser::LogInfo::kTrailers;
537 break;
538 case 2:
539 gpr_log(GPR_ERROR, "too many header frames received");
540 return init_header_skip_frame_parser(t, priority_type);
541 }
542 t->hpack_parser.BeginFrame(
543 incoming_metadata_buffer,
544 t->settings[GRPC_ACKED_SETTINGS]
545 [GRPC_CHTTP2_SETTINGS_MAX_HEADER_LIST_SIZE],
546 hpack_boundary_type(t, is_eoh), priority_type,
547 hpack_parser_log_info(t, frame_type));
548 return GRPC_ERROR_NONE;
549 }
550
init_window_update_frame_parser(grpc_chttp2_transport * t)551 static grpc_error_handle init_window_update_frame_parser(
552 grpc_chttp2_transport* t) {
553 grpc_error_handle err = grpc_chttp2_window_update_parser_begin_frame(
554 &t->simple.window_update, t->incoming_frame_size,
555 t->incoming_frame_flags);
556 if (err != GRPC_ERROR_NONE) return err;
557 if (t->incoming_stream_id != 0) {
558 grpc_chttp2_stream* s = t->incoming_stream =
559 grpc_chttp2_parsing_lookup_stream(t, t->incoming_stream_id);
560 if (s == nullptr) {
561 return init_non_header_skip_frame_parser(t);
562 }
563 s->stats.incoming.framing_bytes += 9;
564 }
565 t->parser = grpc_chttp2_window_update_parser_parse;
566 t->parser_data = &t->simple.window_update;
567 return GRPC_ERROR_NONE;
568 }
569
init_ping_parser(grpc_chttp2_transport * t)570 static grpc_error_handle init_ping_parser(grpc_chttp2_transport* t) {
571 grpc_error_handle err = grpc_chttp2_ping_parser_begin_frame(
572 &t->simple.ping, t->incoming_frame_size, t->incoming_frame_flags);
573 if (err != GRPC_ERROR_NONE) return err;
574 t->parser = grpc_chttp2_ping_parser_parse;
575 t->parser_data = &t->simple.ping;
576 return GRPC_ERROR_NONE;
577 }
578
init_rst_stream_parser(grpc_chttp2_transport * t)579 static grpc_error_handle init_rst_stream_parser(grpc_chttp2_transport* t) {
580 grpc_error_handle err = grpc_chttp2_rst_stream_parser_begin_frame(
581 &t->simple.rst_stream, t->incoming_frame_size, t->incoming_frame_flags);
582 if (err != GRPC_ERROR_NONE) return err;
583 grpc_chttp2_stream* s = t->incoming_stream =
584 grpc_chttp2_parsing_lookup_stream(t, t->incoming_stream_id);
585 if (!t->incoming_stream) {
586 return init_non_header_skip_frame_parser(t);
587 }
588 s->stats.incoming.framing_bytes += 9;
589 t->parser = grpc_chttp2_rst_stream_parser_parse;
590 t->parser_data = &t->simple.rst_stream;
591 return GRPC_ERROR_NONE;
592 }
593
init_goaway_parser(grpc_chttp2_transport * t)594 static grpc_error_handle init_goaway_parser(grpc_chttp2_transport* t) {
595 grpc_error_handle err = grpc_chttp2_goaway_parser_begin_frame(
596 &t->goaway_parser, t->incoming_frame_size, t->incoming_frame_flags);
597 if (err != GRPC_ERROR_NONE) return err;
598 t->parser = grpc_chttp2_goaway_parser_parse;
599 t->parser_data = &t->goaway_parser;
600 return GRPC_ERROR_NONE;
601 }
602
init_settings_frame_parser(grpc_chttp2_transport * t)603 static grpc_error_handle init_settings_frame_parser(grpc_chttp2_transport* t) {
604 if (t->incoming_stream_id != 0) {
605 return GRPC_ERROR_CREATE_FROM_STATIC_STRING(
606 "Settings frame received for grpc_chttp2_stream");
607 }
608
609 grpc_error_handle err = grpc_chttp2_settings_parser_begin_frame(
610 &t->simple.settings, t->incoming_frame_size, t->incoming_frame_flags,
611 t->settings[GRPC_PEER_SETTINGS]);
612 if (err != GRPC_ERROR_NONE) {
613 return err;
614 }
615 if (t->incoming_frame_flags & GRPC_CHTTP2_FLAG_ACK) {
616 memcpy(t->settings[GRPC_ACKED_SETTINGS], t->settings[GRPC_SENT_SETTINGS],
617 GRPC_CHTTP2_NUM_SETTINGS * sizeof(uint32_t));
618 t->hpack_parser.hpack_table()->SetMaxBytes(
619 t->settings[GRPC_ACKED_SETTINGS]
620 [GRPC_CHTTP2_SETTINGS_HEADER_TABLE_SIZE]);
621 t->sent_local_settings = false;
622 }
623 t->parser = grpc_chttp2_settings_parser_parse;
624 t->parser_data = &t->simple.settings;
625 return GRPC_ERROR_NONE;
626 }
627
parse_frame_slice(grpc_chttp2_transport * t,const grpc_slice & slice,int is_last)628 static grpc_error_handle parse_frame_slice(grpc_chttp2_transport* t,
629 const grpc_slice& slice,
630 int is_last) {
631 grpc_chttp2_stream* s = t->incoming_stream;
632 grpc_error_handle err = t->parser(t->parser_data, t, s, slice, is_last);
633 intptr_t unused;
634 if (GPR_LIKELY(err == GRPC_ERROR_NONE)) {
635 return err;
636 } else if (grpc_error_get_int(err, GRPC_ERROR_INT_STREAM_ID, &unused)) {
637 if (GRPC_TRACE_FLAG_ENABLED(grpc_http_trace)) {
638 gpr_log(GPR_ERROR, "%s", grpc_error_std_string(err).c_str());
639 }
640 grpc_chttp2_parsing_become_skip_parser(t);
641 if (s) {
642 s->forced_close_error = err;
643 grpc_chttp2_add_rst_stream_to_next_write(t, t->incoming_stream_id,
644 GRPC_HTTP2_PROTOCOL_ERROR,
645 &s->stats.outgoing);
646 } else {
647 GRPC_ERROR_UNREF(err);
648 }
649 }
650 return err;
651 }
652