| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "http2/decoder/payload_decoders/goaway_payload_decoder.h" |
| |
| #include <stddef.h> |
| |
| #include "absl/base/macros.h" |
| #include "http2/decoder/decode_buffer.h" |
| #include "http2/decoder/http2_frame_decoder_listener.h" |
| #include "http2/http2_constants.h" |
| #include "http2/http2_structures.h" |
| #include "http2/platform/api/http2_bug_tracker.h" |
| #include "http2/platform/api/http2_logging.h" |
| |
| namespace http2 { |
| |
| std::ostream& operator<<(std::ostream& out, |
| GoAwayPayloadDecoder::PayloadState v) { |
| switch (v) { |
| case GoAwayPayloadDecoder::PayloadState::kStartDecodingFixedFields: |
| return out << "kStartDecodingFixedFields"; |
| case GoAwayPayloadDecoder::PayloadState::kHandleFixedFieldsStatus: |
| return out << "kHandleFixedFieldsStatus"; |
| case GoAwayPayloadDecoder::PayloadState::kReadOpaqueData: |
| return out << "kReadOpaqueData"; |
| case GoAwayPayloadDecoder::PayloadState::kResumeDecodingFixedFields: |
| return out << "kResumeDecodingFixedFields"; |
| } |
| // Since the value doesn't come over the wire, only a programming bug should |
| // result in reaching this point. |
| int unknown = static_cast<int>(v); |
| HTTP2_BUG(http2_bug_167_1) |
| << "Invalid GoAwayPayloadDecoder::PayloadState: " << unknown; |
| return out << "GoAwayPayloadDecoder::PayloadState(" << unknown << ")"; |
| } |
| |
| DecodeStatus GoAwayPayloadDecoder::StartDecodingPayload( |
| FrameDecoderState* state, |
| DecodeBuffer* db) { |
| HTTP2_DVLOG(2) << "GoAwayPayloadDecoder::StartDecodingPayload: " |
| << state->frame_header(); |
| QUICHE_DCHECK_EQ(Http2FrameType::GOAWAY, state->frame_header().type); |
| QUICHE_DCHECK_LE(db->Remaining(), state->frame_header().payload_length); |
| QUICHE_DCHECK_EQ(0, state->frame_header().flags); |
| |
| state->InitializeRemainders(); |
| payload_state_ = PayloadState::kStartDecodingFixedFields; |
| return ResumeDecodingPayload(state, db); |
| } |
| |
| DecodeStatus GoAwayPayloadDecoder::ResumeDecodingPayload( |
| FrameDecoderState* state, |
| DecodeBuffer* db) { |
| HTTP2_DVLOG(2) |
| << "GoAwayPayloadDecoder::ResumeDecodingPayload: remaining_payload=" |
| << state->remaining_payload() << ", db->Remaining=" << db->Remaining(); |
| |
| const Http2FrameHeader& frame_header = state->frame_header(); |
| QUICHE_DCHECK_EQ(Http2FrameType::GOAWAY, frame_header.type); |
| QUICHE_DCHECK_LE(db->Remaining(), frame_header.payload_length); |
| QUICHE_DCHECK_NE(PayloadState::kHandleFixedFieldsStatus, payload_state_); |
| |
| // |status| has to be initialized to some value to avoid compiler error in |
| // case PayloadState::kHandleFixedFieldsStatus below, but value does not |
| // matter, see QUICHE_DCHECK_NE above. |
| DecodeStatus status = DecodeStatus::kDecodeError; |
| size_t avail; |
| while (true) { |
| HTTP2_DVLOG(2) |
| << "GoAwayPayloadDecoder::ResumeDecodingPayload payload_state_=" |
| << payload_state_; |
| switch (payload_state_) { |
| case PayloadState::kStartDecodingFixedFields: |
| status = state->StartDecodingStructureInPayload(&goaway_fields_, db); |
| ABSL_FALLTHROUGH_INTENDED; |
| |
| case PayloadState::kHandleFixedFieldsStatus: |
| if (status == DecodeStatus::kDecodeDone) { |
| state->listener()->OnGoAwayStart(frame_header, goaway_fields_); |
| } else { |
| // Not done decoding the structure. Either we've got more payload |
| // to decode, or we've run out because the payload is too short, |
| // in which case OnFrameSizeError will have already been called. |
| QUICHE_DCHECK((status == DecodeStatus::kDecodeInProgress && |
| state->remaining_payload() > 0) || |
| (status == DecodeStatus::kDecodeError && |
| state->remaining_payload() == 0)) |
| << "\n status=" << status |
| << "; remaining_payload=" << state->remaining_payload(); |
| payload_state_ = PayloadState::kResumeDecodingFixedFields; |
| return status; |
| } |
| ABSL_FALLTHROUGH_INTENDED; |
| |
| case PayloadState::kReadOpaqueData: |
| // The opaque data is all the remains to be decoded, so anything left |
| // in the decode buffer is opaque data. |
| avail = db->Remaining(); |
| if (avail > 0) { |
| state->listener()->OnGoAwayOpaqueData(db->cursor(), avail); |
| db->AdvanceCursor(avail); |
| state->ConsumePayload(avail); |
| } |
| if (state->remaining_payload() > 0) { |
| payload_state_ = PayloadState::kReadOpaqueData; |
| return DecodeStatus::kDecodeInProgress; |
| } |
| state->listener()->OnGoAwayEnd(); |
| return DecodeStatus::kDecodeDone; |
| |
| case PayloadState::kResumeDecodingFixedFields: |
| status = state->ResumeDecodingStructureInPayload(&goaway_fields_, db); |
| payload_state_ = PayloadState::kHandleFixedFieldsStatus; |
| continue; |
| } |
| HTTP2_BUG(http2_bug_167_2) << "PayloadState: " << payload_state_; |
| } |
| } |
| |
| } // namespace http2 |