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//
//
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
#include <grpc/support/port_platform.h>
#include "src/core/ext/transport/chttp2/transport/frame_goaway.h"
#include <string.h>
#include "absl/base/attributes.h"
#include "absl/status/status.h"
#include "absl/strings/str_format.h"
#include "absl/strings/string_view.h"
#include <grpc/slice_buffer.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include "src/core/ext/transport/chttp2/transport/internal.h"
void grpc_chttp2_goaway_parser_init(grpc_chttp2_goaway_parser* p) {
p->debug_data = nullptr;
}
void grpc_chttp2_goaway_parser_destroy(grpc_chttp2_goaway_parser* p) {
gpr_free(p->debug_data);
}
grpc_error_handle grpc_chttp2_goaway_parser_begin_frame(
grpc_chttp2_goaway_parser* p, uint32_t length, uint8_t /*flags*/) {
if (length < 8) {
return GRPC_ERROR_CREATE(
absl::StrFormat("goaway frame too short (%d bytes)", length));
}
gpr_free(p->debug_data);
p->debug_length = length - 8;
p->debug_data = static_cast<char*>(gpr_malloc(p->debug_length));
p->debug_pos = 0;
p->state = GRPC_CHTTP2_GOAWAY_LSI0;
return absl::OkStatus();
}
grpc_error_handle grpc_chttp2_goaway_parser_parse(void* parser,
grpc_chttp2_transport* t,
grpc_chttp2_stream* /*s*/,
const grpc_slice& slice,
int is_last) {
const uint8_t* const beg = GRPC_SLICE_START_PTR(slice);
const uint8_t* const end = GRPC_SLICE_END_PTR(slice);
const uint8_t* cur = beg;
grpc_chttp2_goaway_parser* p =
static_cast<grpc_chttp2_goaway_parser*>(parser);
switch (p->state) {
case GRPC_CHTTP2_GOAWAY_LSI0:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_LSI0;
return absl::OkStatus();
}
p->last_stream_id = (static_cast<uint32_t>(*cur)) << 24;
++cur;
ABSL_FALLTHROUGH_INTENDED;
case GRPC_CHTTP2_GOAWAY_LSI1:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_LSI1;
return absl::OkStatus();
}
p->last_stream_id |= (static_cast<uint32_t>(*cur)) << 16;
++cur;
ABSL_FALLTHROUGH_INTENDED;
case GRPC_CHTTP2_GOAWAY_LSI2:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_LSI2;
return absl::OkStatus();
}
p->last_stream_id |= (static_cast<uint32_t>(*cur)) << 8;
++cur;
ABSL_FALLTHROUGH_INTENDED;
case GRPC_CHTTP2_GOAWAY_LSI3:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_LSI3;
return absl::OkStatus();
}
p->last_stream_id |= (static_cast<uint32_t>(*cur));
++cur;
ABSL_FALLTHROUGH_INTENDED;
case GRPC_CHTTP2_GOAWAY_ERR0:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_ERR0;
return absl::OkStatus();
}
p->error_code = (static_cast<uint32_t>(*cur)) << 24;
++cur;
ABSL_FALLTHROUGH_INTENDED;
case GRPC_CHTTP2_GOAWAY_ERR1:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_ERR1;
return absl::OkStatus();
}
p->error_code |= (static_cast<uint32_t>(*cur)) << 16;
++cur;
ABSL_FALLTHROUGH_INTENDED;
case GRPC_CHTTP2_GOAWAY_ERR2:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_ERR2;
return absl::OkStatus();
}
p->error_code |= (static_cast<uint32_t>(*cur)) << 8;
++cur;
ABSL_FALLTHROUGH_INTENDED;
case GRPC_CHTTP2_GOAWAY_ERR3:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_ERR3;
return absl::OkStatus();
}
p->error_code |= (static_cast<uint32_t>(*cur));
++cur;
ABSL_FALLTHROUGH_INTENDED;
case GRPC_CHTTP2_GOAWAY_DEBUG:
if (end != cur) {
memcpy(p->debug_data + p->debug_pos, cur,
static_cast<size_t>(end - cur));
}
GPR_ASSERT((size_t)(end - cur) < UINT32_MAX - p->debug_pos);
p->debug_pos += static_cast<uint32_t>(end - cur);
p->state = GRPC_CHTTP2_GOAWAY_DEBUG;
if (is_last) {
grpc_chttp2_add_incoming_goaway(
t, p->error_code, p->last_stream_id,
absl::string_view(p->debug_data, p->debug_length));
gpr_free(p->debug_data);
p->debug_data = nullptr;
}
return absl::OkStatus();
}
GPR_UNREACHABLE_CODE(return GRPC_ERROR_CREATE("Should never reach here"));
}
void grpc_chttp2_goaway_append(uint32_t last_stream_id, uint32_t error_code,
const grpc_slice& debug_data,
grpc_slice_buffer* slice_buffer) {
grpc_slice header = GRPC_SLICE_MALLOC(9 + 4 + 4);
uint8_t* p = GRPC_SLICE_START_PTR(header);
uint32_t frame_length;
GPR_ASSERT(GRPC_SLICE_LENGTH(debug_data) < UINT32_MAX - 4 - 4);
frame_length = 4 + 4 + static_cast<uint32_t> GRPC_SLICE_LENGTH(debug_data);
// frame header: length
*p++ = static_cast<uint8_t>(frame_length >> 16);
*p++ = static_cast<uint8_t>(frame_length >> 8);
*p++ = static_cast<uint8_t>(frame_length);
// frame header: type
*p++ = GRPC_CHTTP2_FRAME_GOAWAY;
// frame header: flags
*p++ = 0;
// frame header: stream id
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 0;
// payload: last stream id
*p++ = static_cast<uint8_t>(last_stream_id >> 24);
*p++ = static_cast<uint8_t>(last_stream_id >> 16);
*p++ = static_cast<uint8_t>(last_stream_id >> 8);
*p++ = static_cast<uint8_t>(last_stream_id);
// payload: error code
*p++ = static_cast<uint8_t>(error_code >> 24);
*p++ = static_cast<uint8_t>(error_code >> 16);
*p++ = static_cast<uint8_t>(error_code >> 8);
*p++ = static_cast<uint8_t>(error_code);
GPR_ASSERT(p == GRPC_SLICE_END_PTR(header));
grpc_slice_buffer_add(slice_buffer, header);
grpc_slice_buffer_add(slice_buffer, debug_data);
}
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