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/*
*
* Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#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>
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_chttp2_parse_error grpc_chttp2_goaway_parser_begin_frame(
grpc_chttp2_goaway_parser *p, uint32_t length, uint8_t flags) {
if (length < 8) {
gpr_log(GPR_ERROR, "goaway frame too short (%d bytes)", length);
return GRPC_CHTTP2_CONNECTION_ERROR;
}
gpr_free(p->debug_data);
p->debug_length = length - 8;
p->debug_data = gpr_malloc(p->debug_length);
p->debug_pos = 0;
p->state = GRPC_CHTTP2_GOAWAY_LSI0;
return GRPC_CHTTP2_PARSE_OK;
}
grpc_chttp2_parse_error grpc_chttp2_goaway_parser_parse(
grpc_exec_ctx *exec_ctx, void *parser,
grpc_chttp2_transport_parsing *transport_parsing,
grpc_chttp2_stream_parsing *stream_parsing, gpr_slice slice, int is_last) {
uint8_t *const beg = GPR_SLICE_START_PTR(slice);
uint8_t *const end = GPR_SLICE_END_PTR(slice);
uint8_t *cur = beg;
grpc_chttp2_goaway_parser *p = parser;
switch (p->state) {
case GRPC_CHTTP2_GOAWAY_LSI0:
if (cur == end) {
p->state = GRPC_CHTTP2_GOAWAY_LSI0;
return GRPC_CHTTP2_PARSE_OK;
}
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_CHTTP2_PARSE_OK;
}
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_CHTTP2_PARSE_OK;
}
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_CHTTP2_PARSE_OK;
}
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_CHTTP2_PARSE_OK;
}
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_CHTTP2_PARSE_OK;
}
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_CHTTP2_PARSE_OK;
}
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_CHTTP2_PARSE_OK;
}
p->error_code |= ((uint32_t)*cur);
++cur;
/* fallthrough */
case GRPC_CHTTP2_GOAWAY_DEBUG:
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) {
transport_parsing->goaway_received = 1;
transport_parsing->goaway_last_stream_index = p->last_stream_id;
gpr_slice_unref(transport_parsing->goaway_text);
transport_parsing->goaway_error = (grpc_status_code)p->error_code;
transport_parsing->goaway_text =
gpr_slice_new(p->debug_data, p->debug_length, gpr_free);
p->debug_data = NULL;
}
return GRPC_CHTTP2_PARSE_OK;
}
GPR_UNREACHABLE_CODE(return GRPC_CHTTP2_CONNECTION_ERROR);
}
void grpc_chttp2_goaway_append(uint32_t last_stream_id, uint32_t error_code,
gpr_slice debug_data,
gpr_slice_buffer *slice_buffer) {
gpr_slice header = gpr_slice_malloc(9 + 4 + 4);
uint8_t *p = GPR_SLICE_START_PTR(header);
uint32_t frame_length;
GPR_ASSERT(GPR_SLICE_LENGTH(debug_data) < UINT32_MAX - 4 - 4);
frame_length = 4 + 4 + (uint32_t)GPR_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 == GPR_SLICE_END_PTR(header));
gpr_slice_buffer_add(slice_buffer, header);
gpr_slice_buffer_add(slice_buffer, debug_data);
}
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