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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 "src/core/ext/transport/chttp2/transport/frame_goaway.h"
#include "src/core/ext/transport/chttp2/transport/internal.h"
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
void grpc_chttp2_goaway_parser_init(grpc_chttp2_goaway_parser *p) {
p->debug_data = NULL;
}
void grpc_chttp2_goaway_parser_destroy(grpc_chttp2_goaway_parser *p) {
gpr_free(p->debug_data);
}
grpc_error *grpc_chttp2_goaway_parser_begin_frame(grpc_chttp2_goaway_parser *p,
uint32_t length,
uint8_t flags) {
if (length < 8) {
char *msg;
gpr_asprintf(&msg, "goaway frame too short (%d bytes)", length);
grpc_error *err = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
return err;
}
gpr_free(p->debug_data);
p->debug_length = length - 8;
p->debug_data = (char *)gpr_malloc(p->debug_length);
p->debug_pos = 0;
p->state = GRPC_CHTTP2_GOAWAY_LSI0;
return GRPC_ERROR_NONE;
}
grpc_error *grpc_chttp2_goaway_parser_parse(grpc_exec_ctx *exec_ctx,
void *parser,
grpc_chttp2_transport *t,
grpc_chttp2_stream *s,
grpc_slice slice, int is_last) {
uint8_t *const beg = GRPC_SLICE_START_PTR(slice);
uint8_t *const end = GRPC_SLICE_END_PTR(slice);
uint8_t *cur = beg;
grpc_chttp2_goaway_parser *p = (grpc_chttp2_goaway_parser *)parser;
switch (p->state) {
case GRPC_CHTTP2_GOAWAY_LSI0:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_LSI0;
return GRPC_ERROR_NONE;
}
p->last_stream_id = ((uint32_t)*cur) << 24;
++cur;
/* fallthrough */
case GRPC_CHTTP2_GOAWAY_LSI1:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_LSI1;
return GRPC_ERROR_NONE;
}
p->last_stream_id |= ((uint32_t)*cur) << 16;
++cur;
/* fallthrough */
case GRPC_CHTTP2_GOAWAY_LSI2:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_LSI2;
return GRPC_ERROR_NONE;
}
p->last_stream_id |= ((uint32_t)*cur) << 8;
++cur;
/* fallthrough */
case GRPC_CHTTP2_GOAWAY_LSI3:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_LSI3;
return GRPC_ERROR_NONE;
}
p->last_stream_id |= ((uint32_t)*cur);
++cur;
/* fallthrough */
case GRPC_CHTTP2_GOAWAY_ERR0:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_ERR0;
return GRPC_ERROR_NONE;
}
p->error_code = ((uint32_t)*cur) << 24;
++cur;
/* fallthrough */
case GRPC_CHTTP2_GOAWAY_ERR1:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_ERR1;
return GRPC_ERROR_NONE;
}
p->error_code |= ((uint32_t)*cur) << 16;
++cur;
/* fallthrough */
case GRPC_CHTTP2_GOAWAY_ERR2:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_ERR2;
return GRPC_ERROR_NONE;
}
p->error_code |= ((uint32_t)*cur) << 8;
++cur;
/* fallthrough */
case GRPC_CHTTP2_GOAWAY_ERR3:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_ERR3;
return GRPC_ERROR_NONE;
}
p->error_code |= ((uint32_t)*cur);
++cur;
/* fallthrough */
case GRPC_CHTTP2_GOAWAY_DEBUG:
if (end != cur)
memcpy(p->debug_data + p->debug_pos, cur, (size_t)(end - cur));
GPR_ASSERT((size_t)(end - cur) < UINT32_MAX - p->debug_pos);
p->debug_pos += (uint32_t)(end - cur);
p->state = GRPC_CHTTP2_GOAWAY_DEBUG;
if (is_last) {
grpc_chttp2_add_incoming_goaway(
exec_ctx, t, (uint32_t)p->error_code,
grpc_slice_new(p->debug_data, p->debug_length, gpr_free));
p->debug_data = NULL;
}
return GRPC_ERROR_NONE;
}
GPR_UNREACHABLE_CODE(
return GRPC_ERROR_CREATE_FROM_STATIC_STRING("Should never reach here"));
}
void grpc_chttp2_goaway_append(uint32_t last_stream_id, uint32_t error_code,
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 + (uint32_t)GRPC_SLICE_LENGTH(debug_data);
/* frame header: length */
*p++ = (uint8_t)(frame_length >> 16);
*p++ = (uint8_t)(frame_length >> 8);
*p++ = (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++ = (uint8_t)(last_stream_id >> 24);
*p++ = (uint8_t)(last_stream_id >> 16);
*p++ = (uint8_t)(last_stream_id >> 8);
*p++ = (uint8_t)(last_stream_id);
/* payload: error code */
*p++ = (uint8_t)(error_code >> 24);
*p++ = (uint8_t)(error_code >> 16);
*p++ = (uint8_t)(error_code >> 8);
*p++ = (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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