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|
/*
*
* Copyright 2015, 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/internal.h"
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/transport/chttp2/transport/http2_errors.h"
#include "src/core/ext/transport/chttp2/transport/status_conversion.h"
#include "src/core/ext/transport/chttp2/transport/timeout_encoding.h"
#include "src/core/lib/profiling/timers.h"
#include "src/core/lib/transport/static_metadata.h"
#define TRANSPORT_FROM_PARSING(tp) \
((grpc_chttp2_transport *)((char *)(tp)-offsetof(grpc_chttp2_transport, \
parsing)))
static grpc_error *init_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing);
static grpc_error *init_header_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing,
int is_continuation);
static grpc_error *init_data_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing);
static grpc_error *init_rst_stream_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing);
static grpc_error *init_settings_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing);
static grpc_error *init_window_update_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing);
static grpc_error *init_ping_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing);
static grpc_error *init_goaway_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing);
static grpc_error *init_skip_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing,
int is_header);
static grpc_error *parse_frame_slice(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing,
gpr_slice slice, int is_last);
void grpc_chttp2_prepare_to_read(
grpc_chttp2_transport_global *transport_global,
grpc_chttp2_transport_parsing *transport_parsing) {
grpc_chttp2_stream_global *stream_global;
grpc_chttp2_stream_parsing *stream_parsing;
GPR_TIMER_BEGIN("grpc_chttp2_prepare_to_read", 0);
transport_parsing->next_stream_id = transport_global->next_stream_id;
memcpy(transport_parsing->last_sent_settings,
transport_global->settings[GRPC_SENT_SETTINGS],
sizeof(transport_parsing->last_sent_settings));
transport_parsing->max_frame_size =
transport_global->settings[GRPC_ACKED_SETTINGS]
[GRPC_CHTTP2_SETTINGS_MAX_FRAME_SIZE];
/* update the parsing view of incoming window */
while (grpc_chttp2_list_pop_unannounced_incoming_window_available(
transport_global, transport_parsing, &stream_global, &stream_parsing)) {
GRPC_CHTTP2_FLOW_MOVE_STREAM("parse", transport_parsing, stream_parsing,
incoming_window, stream_global,
unannounced_incoming_window_for_parse);
}
GPR_TIMER_END("grpc_chttp2_prepare_to_read", 0);
}
void grpc_chttp2_publish_reads(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_global *transport_global,
grpc_chttp2_transport_parsing *transport_parsing) {
grpc_chttp2_stream_global *stream_global;
grpc_chttp2_stream_parsing *stream_parsing;
int was_zero;
int is_zero;
/* transport_parsing->last_incoming_stream_id is used as
last-grpc_chttp2_stream-id when
sending GOAWAY frame.
https://tools.ietf.org/html/draft-ietf-httpbis-http2-17#section-6.8
says that last-grpc_chttp2_stream-id is peer-initiated grpc_chttp2_stream
ID. So,
since we don't have server pushed streams, client should send
GOAWAY last-grpc_chttp2_stream-id=0 in this case. */
if (!transport_parsing->is_client) {
transport_global->last_incoming_stream_id =
transport_parsing->last_incoming_stream_id;
}
/* update global settings */
if (transport_parsing->settings_updated) {
memcpy(transport_global->settings[GRPC_PEER_SETTINGS],
transport_parsing->settings, sizeof(transport_parsing->settings));
transport_parsing->settings_updated = 0;
}
/* update settings based on ack if received */
if (transport_parsing->settings_ack_received) {
memcpy(transport_global->settings[GRPC_ACKED_SETTINGS],
transport_global->settings[GRPC_SENT_SETTINGS],
GRPC_CHTTP2_NUM_SETTINGS * sizeof(uint32_t));
transport_parsing->settings_ack_received = 0;
transport_global->sent_local_settings = 0;
}
/* move goaway to the global state if we received one (it will be
published later */
if (transport_parsing->goaway_received) {
grpc_chttp2_add_incoming_goaway(exec_ctx, transport_global,
(uint32_t)transport_parsing->goaway_error,
transport_parsing->goaway_text);
transport_parsing->goaway_text = gpr_empty_slice();
transport_parsing->goaway_received = 0;
}
/* propagate flow control tokens to global state */
was_zero = transport_global->outgoing_window <= 0;
GRPC_CHTTP2_FLOW_MOVE_TRANSPORT("parsed", transport_global, outgoing_window,
transport_parsing, outgoing_window);
is_zero = transport_global->outgoing_window <= 0;
if (was_zero && !is_zero) {
grpc_chttp2_initiate_write(exec_ctx, transport_global, false,
"new_global_flow_control");
}
if (transport_parsing->incoming_window <
transport_global->connection_window_target * 3 / 4) {
int64_t announce_bytes = transport_global->connection_window_target -
transport_parsing->incoming_window;
GRPC_CHTTP2_FLOW_CREDIT_TRANSPORT("parsed", transport_global,
announce_incoming_window, announce_bytes);
GRPC_CHTTP2_FLOW_CREDIT_TRANSPORT("parsed", transport_parsing,
incoming_window, announce_bytes);
grpc_chttp2_initiate_write(exec_ctx, transport_global, false,
"global incoming window");
}
/* for each stream that saw an update, fixup global state */
while (grpc_chttp2_list_pop_parsing_seen_stream(
transport_global, transport_parsing, &stream_global, &stream_parsing)) {
if (stream_parsing->seen_error) {
stream_global->seen_error = true;
stream_global->exceeded_metadata_size =
stream_parsing->exceeded_metadata_size;
grpc_chttp2_list_add_check_read_ops(transport_global, stream_global);
}
/* flush stats to global stream state */
grpc_transport_move_stats(&stream_parsing->stats, &stream_global->stats);
/* update outgoing flow control window */
was_zero = stream_global->outgoing_window <= 0;
GRPC_CHTTP2_FLOW_MOVE_STREAM("parsed", transport_global, stream_global,
outgoing_window, stream_parsing,
outgoing_window);
is_zero = stream_global->outgoing_window <= 0;
if (was_zero && !is_zero) {
grpc_chttp2_become_writable(exec_ctx, transport_global, stream_global,
false, "stream.read_flow_control");
}
stream_global->max_recv_bytes -= (uint32_t)GPR_MIN(
stream_global->max_recv_bytes, stream_parsing->received_bytes);
stream_parsing->received_bytes = 0;
/* publish incoming stream ops */
if (stream_global->incoming_frames.tail != NULL) {
stream_global->incoming_frames.tail->is_tail = 0;
}
if (stream_parsing->data_parser.incoming_frames.head != NULL) {
grpc_chttp2_list_add_check_read_ops(transport_global, stream_global);
}
grpc_chttp2_incoming_frame_queue_merge(
&stream_global->incoming_frames,
&stream_parsing->data_parser.incoming_frames);
if (stream_global->incoming_frames.tail != NULL) {
stream_global->incoming_frames.tail->is_tail = 1;
}
if (!stream_global->published_initial_metadata &&
stream_parsing->got_metadata_on_parse[0]) {
stream_parsing->got_metadata_on_parse[0] = 0;
stream_global->published_initial_metadata = 1;
GPR_SWAP(grpc_chttp2_incoming_metadata_buffer,
stream_parsing->metadata_buffer[0],
stream_global->received_initial_metadata);
grpc_chttp2_list_add_check_read_ops(transport_global, stream_global);
}
if (!stream_global->published_trailing_metadata &&
stream_parsing->got_metadata_on_parse[1]) {
stream_parsing->got_metadata_on_parse[1] = 0;
stream_global->published_trailing_metadata = 1;
GPR_SWAP(grpc_chttp2_incoming_metadata_buffer,
stream_parsing->metadata_buffer[1],
stream_global->received_trailing_metadata);
grpc_chttp2_list_add_check_read_ops(transport_global, stream_global);
}
if (stream_parsing->forced_close_error != GRPC_ERROR_NONE) {
intptr_t reason;
bool has_reason = grpc_error_get_int(stream_parsing->forced_close_error,
GRPC_ERROR_INT_HTTP2_ERROR, &reason);
if (has_reason && reason != GRPC_CHTTP2_NO_ERROR) {
grpc_status_code status_code =
has_reason
? grpc_chttp2_http2_error_to_grpc_status(
(grpc_chttp2_error_code)reason, stream_global->deadline)
: GRPC_STATUS_INTERNAL;
const char *status_details =
grpc_error_string(stream_parsing->forced_close_error);
gpr_slice slice_details = gpr_slice_from_copied_string(status_details);
grpc_error_free_string(status_details);
grpc_chttp2_fake_status(exec_ctx, transport_global, stream_global,
status_code, &slice_details);
}
grpc_chttp2_mark_stream_closed(exec_ctx, transport_global, stream_global,
1, 1, stream_parsing->forced_close_error);
}
if (stream_parsing->received_close) {
if (transport_global->is_client && !stream_global->write_closed) {
gpr_slice_buffer_add(&transport_global->qbuf,
grpc_chttp2_rst_stream_create(transport_parsing->incoming_stream_id, GRPC_CHTTP2_NO_ERROR, &stream_parsing->stats.outgoing));
grpc_chttp2_initiate_write(exec_ctx, transport_global, false, "rst");
grpc_chttp2_mark_stream_closed(exec_ctx, transport_global, stream_global,
1, 1, GRPC_ERROR_NONE);
} else {
grpc_chttp2_mark_stream_closed(exec_ctx, transport_global, stream_global,
1, 0, GRPC_ERROR_NONE);
}
}
}
}
grpc_error *grpc_chttp2_perform_read(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing,
gpr_slice slice) {
uint8_t *beg = GPR_SLICE_START_PTR(slice);
uint8_t *end = GPR_SLICE_END_PTR(slice);
uint8_t *cur = beg;
grpc_error *err;
if (cur == end) return GRPC_ERROR_NONE;
switch (transport_parsing->deframe_state) {
case GRPC_DTS_CLIENT_PREFIX_0:
case GRPC_DTS_CLIENT_PREFIX_1:
case GRPC_DTS_CLIENT_PREFIX_2:
case GRPC_DTS_CLIENT_PREFIX_3:
case GRPC_DTS_CLIENT_PREFIX_4:
case GRPC_DTS_CLIENT_PREFIX_5:
case GRPC_DTS_CLIENT_PREFIX_6:
case GRPC_DTS_CLIENT_PREFIX_7:
case GRPC_DTS_CLIENT_PREFIX_8:
case GRPC_DTS_CLIENT_PREFIX_9:
case GRPC_DTS_CLIENT_PREFIX_10:
case GRPC_DTS_CLIENT_PREFIX_11:
case GRPC_DTS_CLIENT_PREFIX_12:
case GRPC_DTS_CLIENT_PREFIX_13:
case GRPC_DTS_CLIENT_PREFIX_14:
case GRPC_DTS_CLIENT_PREFIX_15:
case GRPC_DTS_CLIENT_PREFIX_16:
case GRPC_DTS_CLIENT_PREFIX_17:
case GRPC_DTS_CLIENT_PREFIX_18:
case GRPC_DTS_CLIENT_PREFIX_19:
case GRPC_DTS_CLIENT_PREFIX_20:
case GRPC_DTS_CLIENT_PREFIX_21:
case GRPC_DTS_CLIENT_PREFIX_22:
case GRPC_DTS_CLIENT_PREFIX_23:
while (cur != end && transport_parsing->deframe_state != GRPC_DTS_FH_0) {
if (*cur != GRPC_CHTTP2_CLIENT_CONNECT_STRING[transport_parsing
->deframe_state]) {
char *msg;
gpr_asprintf(
&msg,
"Connect string mismatch: expected '%c' (%d) got '%c' (%d) "
"at byte %d",
GRPC_CHTTP2_CLIENT_CONNECT_STRING[transport_parsing
->deframe_state],
(int)(uint8_t)GRPC_CHTTP2_CLIENT_CONNECT_STRING
[transport_parsing->deframe_state],
*cur, (int)*cur, transport_parsing->deframe_state);
err = GRPC_ERROR_CREATE(msg);
gpr_free(msg);
return err;
}
++cur;
++transport_parsing->deframe_state;
}
if (cur == end) {
return GRPC_ERROR_NONE;
}
/* fallthrough */
dts_fh_0:
case GRPC_DTS_FH_0:
GPR_ASSERT(cur < end);
transport_parsing->incoming_frame_size = ((uint32_t)*cur) << 16;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_1;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_1:
GPR_ASSERT(cur < end);
transport_parsing->incoming_frame_size |= ((uint32_t)*cur) << 8;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_2;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_2:
GPR_ASSERT(cur < end);
transport_parsing->incoming_frame_size |= *cur;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_3;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_3:
GPR_ASSERT(cur < end);
transport_parsing->incoming_frame_type = *cur;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_4;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_4:
GPR_ASSERT(cur < end);
transport_parsing->incoming_frame_flags = *cur;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_5;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_5:
GPR_ASSERT(cur < end);
transport_parsing->incoming_stream_id = (((uint32_t)*cur) & 0x7f) << 24;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_6;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_6:
GPR_ASSERT(cur < end);
transport_parsing->incoming_stream_id |= ((uint32_t)*cur) << 16;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_7;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_7:
GPR_ASSERT(cur < end);
transport_parsing->incoming_stream_id |= ((uint32_t)*cur) << 8;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_8;
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FH_8:
GPR_ASSERT(cur < end);
transport_parsing->incoming_stream_id |= ((uint32_t)*cur);
transport_parsing->deframe_state = GRPC_DTS_FRAME;
err = init_frame_parser(exec_ctx, transport_parsing);
if (err != GRPC_ERROR_NONE) {
return err;
}
if (transport_parsing->incoming_stream_id != 0 &&
transport_parsing->incoming_stream_id >
transport_parsing->last_incoming_stream_id) {
transport_parsing->last_incoming_stream_id =
transport_parsing->incoming_stream_id;
}
if (transport_parsing->incoming_frame_size == 0) {
err = parse_frame_slice(exec_ctx, transport_parsing, gpr_empty_slice(),
1);
if (err != GRPC_ERROR_NONE) {
return err;
}
transport_parsing->incoming_stream = NULL;
if (++cur == end) {
transport_parsing->deframe_state = GRPC_DTS_FH_0;
return GRPC_ERROR_NONE;
}
goto dts_fh_0; /* loop */
} else if (transport_parsing->incoming_frame_size >
transport_parsing->max_frame_size) {
char *msg;
gpr_asprintf(&msg, "Frame size %d is larger than max frame size %d",
transport_parsing->incoming_frame_size,
transport_parsing->max_frame_size);
err = GRPC_ERROR_CREATE(msg);
gpr_free(msg);
return err;
}
if (++cur == end) {
return GRPC_ERROR_NONE;
}
/* fallthrough */
case GRPC_DTS_FRAME:
GPR_ASSERT(cur < end);
if ((uint32_t)(end - cur) == transport_parsing->incoming_frame_size) {
err = parse_frame_slice(exec_ctx, transport_parsing,
gpr_slice_sub_no_ref(slice, (size_t)(cur - beg),
(size_t)(end - beg)),
1);
if (err != GRPC_ERROR_NONE) {
return err;
}
transport_parsing->deframe_state = GRPC_DTS_FH_0;
transport_parsing->incoming_stream = NULL;
return GRPC_ERROR_NONE;
} else if ((uint32_t)(end - cur) >
transport_parsing->incoming_frame_size) {
size_t cur_offset = (size_t)(cur - beg);
err = parse_frame_slice(
exec_ctx, transport_parsing,
gpr_slice_sub_no_ref(
slice, cur_offset,
cur_offset + transport_parsing->incoming_frame_size),
1);
if (err != GRPC_ERROR_NONE) {
return err;
}
cur += transport_parsing->incoming_frame_size;
transport_parsing->incoming_stream = NULL;
goto dts_fh_0; /* loop */
} else {
err = parse_frame_slice(exec_ctx, transport_parsing,
gpr_slice_sub_no_ref(slice, (size_t)(cur - beg),
(size_t)(end - beg)),
0);
if (err != GRPC_ERROR_NONE) {
return err;
}
transport_parsing->incoming_frame_size -= (uint32_t)(end - cur);
return GRPC_ERROR_NONE;
}
GPR_UNREACHABLE_CODE(return 0);
}
GPR_UNREACHABLE_CODE(return 0);
}
static grpc_error *init_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing) {
if (transport_parsing->is_first_frame &&
transport_parsing->incoming_frame_type != GRPC_CHTTP2_FRAME_SETTINGS) {
char *msg;
gpr_asprintf(
&msg, "Expected SETTINGS frame as the first frame, got frame type %d",
transport_parsing->incoming_frame_type);
grpc_error *err = GRPC_ERROR_CREATE(msg);
gpr_free(msg);
return err;
}
transport_parsing->is_first_frame = false;
if (transport_parsing->expect_continuation_stream_id != 0) {
if (transport_parsing->incoming_frame_type !=
GRPC_CHTTP2_FRAME_CONTINUATION) {
char *msg;
gpr_asprintf(&msg, "Expected CONTINUATION frame, got frame type %02x",
transport_parsing->incoming_frame_type);
grpc_error *err = GRPC_ERROR_CREATE(msg);
gpr_free(msg);
return err;
}
if (transport_parsing->expect_continuation_stream_id !=
transport_parsing->incoming_stream_id) {
char *msg;
gpr_asprintf(
&msg,
"Expected CONTINUATION frame for grpc_chttp2_stream %08x, got "
"grpc_chttp2_stream %08x",
transport_parsing->expect_continuation_stream_id,
transport_parsing->incoming_stream_id);
grpc_error *err = GRPC_ERROR_CREATE(msg);
gpr_free(msg);
return err;
}
return init_header_frame_parser(exec_ctx, transport_parsing, 1);
}
switch (transport_parsing->incoming_frame_type) {
case GRPC_CHTTP2_FRAME_DATA:
return init_data_frame_parser(exec_ctx, transport_parsing);
case GRPC_CHTTP2_FRAME_HEADER:
return init_header_frame_parser(exec_ctx, transport_parsing, 0);
case GRPC_CHTTP2_FRAME_CONTINUATION:
return GRPC_ERROR_CREATE("Unexpected CONTINUATION frame");
case GRPC_CHTTP2_FRAME_RST_STREAM:
return init_rst_stream_parser(exec_ctx, transport_parsing);
case GRPC_CHTTP2_FRAME_SETTINGS:
return init_settings_frame_parser(exec_ctx, transport_parsing);
case GRPC_CHTTP2_FRAME_WINDOW_UPDATE:
return init_window_update_frame_parser(exec_ctx, transport_parsing);
case GRPC_CHTTP2_FRAME_PING:
return init_ping_parser(exec_ctx, transport_parsing);
case GRPC_CHTTP2_FRAME_GOAWAY:
return init_goaway_parser(exec_ctx, transport_parsing);
default:
if (grpc_http_trace) {
gpr_log(GPR_ERROR, "Unknown frame type %02x",
transport_parsing->incoming_frame_type);
}
return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
}
}
static grpc_error *skip_parser(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) {
return GRPC_ERROR_NONE;
}
static void skip_header(void *tp, grpc_mdelem *md) { GRPC_MDELEM_UNREF(md); }
static grpc_error *init_skip_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing,
int is_header) {
if (is_header) {
uint8_t is_eoh = transport_parsing->expect_continuation_stream_id != 0;
transport_parsing->parser = grpc_chttp2_header_parser_parse;
transport_parsing->parser_data = &transport_parsing->hpack_parser;
transport_parsing->hpack_parser.on_header = skip_header;
transport_parsing->hpack_parser.on_header_user_data = NULL;
transport_parsing->hpack_parser.is_boundary = is_eoh;
transport_parsing->hpack_parser.is_eof =
(uint8_t)(is_eoh ? transport_parsing->header_eof : 0);
} else {
transport_parsing->parser = skip_parser;
}
return GRPC_ERROR_NONE;
}
void grpc_chttp2_parsing_become_skip_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing) {
init_skip_frame_parser(
exec_ctx, transport_parsing,
transport_parsing->parser == grpc_chttp2_header_parser_parse);
}
static grpc_error *update_incoming_window(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing,
grpc_chttp2_stream_parsing *stream_parsing) {
uint32_t incoming_frame_size = transport_parsing->incoming_frame_size;
if (incoming_frame_size > transport_parsing->incoming_window) {
char *msg;
gpr_asprintf(&msg, "frame of size %d overflows incoming window of %" PRId64,
transport_parsing->incoming_frame_size,
transport_parsing->incoming_window);
grpc_error *err = GRPC_ERROR_CREATE(msg);
gpr_free(msg);
return err;
}
if (incoming_frame_size > stream_parsing->incoming_window) {
char *msg;
gpr_asprintf(&msg, "frame of size %d overflows incoming window of %" PRId64,
transport_parsing->incoming_frame_size,
stream_parsing->incoming_window);
grpc_error *err = GRPC_ERROR_CREATE(msg);
gpr_free(msg);
return err;
}
GRPC_CHTTP2_FLOW_DEBIT_TRANSPORT("parse", transport_parsing, incoming_window,
incoming_frame_size);
GRPC_CHTTP2_FLOW_DEBIT_STREAM("parse", transport_parsing, stream_parsing,
incoming_window, incoming_frame_size);
stream_parsing->received_bytes += incoming_frame_size;
grpc_chttp2_list_add_parsing_seen_stream(transport_parsing, stream_parsing);
return GRPC_ERROR_NONE;
}
static grpc_error *init_data_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing) {
grpc_chttp2_stream_parsing *stream_parsing =
grpc_chttp2_parsing_lookup_stream(transport_parsing,
transport_parsing->incoming_stream_id);
grpc_error *err = GRPC_ERROR_NONE;
if (stream_parsing == NULL) {
return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
}
stream_parsing->stats.incoming.framing_bytes += 9;
if (stream_parsing->received_close) {
return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
}
if (err == GRPC_ERROR_NONE) {
err = update_incoming_window(exec_ctx, transport_parsing, stream_parsing);
}
if (err == GRPC_ERROR_NONE) {
err = grpc_chttp2_data_parser_begin_frame(
&stream_parsing->data_parser, transport_parsing->incoming_frame_flags,
stream_parsing->id);
}
if (err == GRPC_ERROR_NONE) {
transport_parsing->incoming_stream = stream_parsing;
transport_parsing->parser = grpc_chttp2_data_parser_parse;
transport_parsing->parser_data = &stream_parsing->data_parser;
return GRPC_ERROR_NONE;
} else if (grpc_error_get_int(err, GRPC_ERROR_INT_STREAM_ID, NULL)) {
/* handle stream errors by closing the stream */
stream_parsing->received_close = 1;
stream_parsing->forced_close_error = err;
gpr_slice_buffer_add(
&transport_parsing->qbuf,
grpc_chttp2_rst_stream_create(transport_parsing->incoming_stream_id,
GRPC_CHTTP2_PROTOCOL_ERROR,
&stream_parsing->stats.outgoing));
return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
} else {
return err;
}
}
static void free_timeout(void *p) { gpr_free(p); }
static void on_initial_header(void *tp, grpc_mdelem *md) {
grpc_chttp2_transport_parsing *transport_parsing = tp;
grpc_chttp2_stream_parsing *stream_parsing =
transport_parsing->incoming_stream;
GPR_TIMER_BEGIN("on_initial_header", 0);
GPR_ASSERT(stream_parsing);
GRPC_CHTTP2_IF_TRACING(gpr_log(
GPR_INFO, "HTTP:%d:HDR:%s: %s: %s", stream_parsing->id,
transport_parsing->is_client ? "CLI" : "SVR",
grpc_mdstr_as_c_string(md->key), grpc_mdstr_as_c_string(md->value)));
if (md->key == GRPC_MDSTR_GRPC_STATUS && md != GRPC_MDELEM_GRPC_STATUS_0) {
/* TODO(ctiller): check for a status like " 0" */
stream_parsing->seen_error = true;
}
if (md->key == GRPC_MDSTR_GRPC_TIMEOUT) {
gpr_timespec *cached_timeout = grpc_mdelem_get_user_data(md, free_timeout);
if (!cached_timeout) {
/* not already parsed: parse it now, and store the result away */
cached_timeout = gpr_malloc(sizeof(gpr_timespec));
if (!grpc_chttp2_decode_timeout(grpc_mdstr_as_c_string(md->value),
cached_timeout)) {
gpr_log(GPR_ERROR, "Ignoring bad timeout value '%s'",
grpc_mdstr_as_c_string(md->value));
*cached_timeout = gpr_inf_future(GPR_TIMESPAN);
}
grpc_mdelem_set_user_data(md, free_timeout, cached_timeout);
}
grpc_chttp2_incoming_metadata_buffer_set_deadline(
&stream_parsing->metadata_buffer[0],
gpr_time_add(gpr_now(GPR_CLOCK_MONOTONIC), *cached_timeout));
GRPC_MDELEM_UNREF(md);
} else {
const size_t new_size =
stream_parsing->metadata_buffer[0].size + GRPC_MDELEM_LENGTH(md);
grpc_chttp2_transport_global *transport_global =
&TRANSPORT_FROM_PARSING(transport_parsing)->global;
const size_t metadata_size_limit =
transport_global->settings[GRPC_LOCAL_SETTINGS]
[GRPC_CHTTP2_SETTINGS_MAX_HEADER_LIST_SIZE];
if (new_size > metadata_size_limit) {
if (!stream_parsing->exceeded_metadata_size) {
gpr_log(GPR_DEBUG,
"received initial metadata size exceeds limit (%" PRIuPTR
" vs. %" PRIuPTR ")",
new_size, metadata_size_limit);
stream_parsing->seen_error = true;
stream_parsing->exceeded_metadata_size = true;
}
GRPC_MDELEM_UNREF(md);
} else {
grpc_chttp2_incoming_metadata_buffer_add(
&stream_parsing->metadata_buffer[0], md);
}
}
grpc_chttp2_list_add_parsing_seen_stream(transport_parsing, stream_parsing);
GPR_TIMER_END("on_initial_header", 0);
}
static void on_trailing_header(void *tp, grpc_mdelem *md) {
grpc_chttp2_transport_parsing *transport_parsing = tp;
grpc_chttp2_stream_parsing *stream_parsing =
transport_parsing->incoming_stream;
GPR_TIMER_BEGIN("on_trailing_header", 0);
GPR_ASSERT(stream_parsing);
GRPC_CHTTP2_IF_TRACING(gpr_log(
GPR_INFO, "HTTP:%d:TRL:%s: %s: %s", stream_parsing->id,
transport_parsing->is_client ? "CLI" : "SVR",
grpc_mdstr_as_c_string(md->key), grpc_mdstr_as_c_string(md->value)));
if (md->key == GRPC_MDSTR_GRPC_STATUS && md != GRPC_MDELEM_GRPC_STATUS_0) {
/* TODO(ctiller): check for a status like " 0" */
stream_parsing->seen_error = true;
}
const size_t new_size =
stream_parsing->metadata_buffer[1].size + GRPC_MDELEM_LENGTH(md);
grpc_chttp2_transport_global *transport_global =
&TRANSPORT_FROM_PARSING(transport_parsing)->global;
const size_t metadata_size_limit =
transport_global->settings[GRPC_LOCAL_SETTINGS]
[GRPC_CHTTP2_SETTINGS_MAX_HEADER_LIST_SIZE];
if (new_size > metadata_size_limit) {
if (!stream_parsing->exceeded_metadata_size) {
gpr_log(GPR_DEBUG,
"received trailing metadata size exceeds limit (%" PRIuPTR
" vs. %" PRIuPTR ")",
new_size, metadata_size_limit);
stream_parsing->seen_error = true;
stream_parsing->exceeded_metadata_size = true;
}
GRPC_MDELEM_UNREF(md);
} else {
grpc_chttp2_incoming_metadata_buffer_add(
&stream_parsing->metadata_buffer[1], md);
}
grpc_chttp2_list_add_parsing_seen_stream(transport_parsing, stream_parsing);
GPR_TIMER_END("on_trailing_header", 0);
}
static grpc_error *init_header_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing,
int is_continuation) {
uint8_t is_eoh = (transport_parsing->incoming_frame_flags &
GRPC_CHTTP2_DATA_FLAG_END_HEADERS) != 0;
int via_accept = 0;
grpc_chttp2_stream_parsing *stream_parsing;
/* TODO(ctiller): when to increment header_frames_received? */
if (is_eoh) {
transport_parsing->expect_continuation_stream_id = 0;
} else {
transport_parsing->expect_continuation_stream_id =
transport_parsing->incoming_stream_id;
}
if (!is_continuation) {
transport_parsing->header_eof = (transport_parsing->incoming_frame_flags &
GRPC_CHTTP2_DATA_FLAG_END_STREAM) != 0;
}
/* could be a new grpc_chttp2_stream or an existing grpc_chttp2_stream */
stream_parsing = grpc_chttp2_parsing_lookup_stream(
transport_parsing, transport_parsing->incoming_stream_id);
if (stream_parsing == NULL) {
if (is_continuation) {
gpr_log(GPR_ERROR,
"grpc_chttp2_stream disbanded before CONTINUATION received");
return init_skip_frame_parser(exec_ctx, transport_parsing, 1);
}
if (transport_parsing->is_client) {
if ((transport_parsing->incoming_stream_id & 1) &&
transport_parsing->incoming_stream_id <
transport_parsing->next_stream_id) {
/* this is an old (probably cancelled) grpc_chttp2_stream */
} else {
gpr_log(GPR_ERROR,
"ignoring new grpc_chttp2_stream creation on client");
}
return init_skip_frame_parser(exec_ctx, transport_parsing, 1);
} else if (transport_parsing->last_incoming_stream_id >
transport_parsing->incoming_stream_id) {
gpr_log(GPR_ERROR,
"ignoring out of order new grpc_chttp2_stream request on server; "
"last grpc_chttp2_stream "
"id=%d, new grpc_chttp2_stream id=%d",
transport_parsing->last_incoming_stream_id,
transport_parsing->incoming_stream_id);
return init_skip_frame_parser(exec_ctx, transport_parsing, 1);
} else if ((transport_parsing->incoming_stream_id & 1) == 0) {
gpr_log(GPR_ERROR,
"ignoring grpc_chttp2_stream with non-client generated index %d",
transport_parsing->incoming_stream_id);
return init_skip_frame_parser(exec_ctx, transport_parsing, 1);
}
stream_parsing = transport_parsing->incoming_stream =
grpc_chttp2_parsing_accept_stream(
exec_ctx, transport_parsing, transport_parsing->incoming_stream_id);
if (stream_parsing == NULL) {
gpr_log(GPR_ERROR, "grpc_chttp2_stream not accepted");
return init_skip_frame_parser(exec_ctx, transport_parsing, 1);
}
via_accept = 1;
} else {
transport_parsing->incoming_stream = stream_parsing;
}
GPR_ASSERT(stream_parsing != NULL && (via_accept == 0 || via_accept == 1));
stream_parsing->stats.incoming.framing_bytes += 9;
if (stream_parsing->received_close) {
gpr_log(GPR_ERROR, "skipping already closed grpc_chttp2_stream header");
transport_parsing->incoming_stream = NULL;
return init_skip_frame_parser(exec_ctx, transport_parsing, 1);
}
transport_parsing->parser = grpc_chttp2_header_parser_parse;
transport_parsing->parser_data = &transport_parsing->hpack_parser;
switch (stream_parsing->header_frames_received) {
case 0:
transport_parsing->hpack_parser.on_header = on_initial_header;
break;
case 1:
transport_parsing->hpack_parser.on_header = on_trailing_header;
break;
case 2:
gpr_log(GPR_ERROR, "too many header frames received");
return init_skip_frame_parser(exec_ctx, transport_parsing, 1);
}
transport_parsing->hpack_parser.on_header_user_data = transport_parsing;
transport_parsing->hpack_parser.is_boundary = is_eoh;
transport_parsing->hpack_parser.is_eof =
(uint8_t)(is_eoh ? transport_parsing->header_eof : 0);
if (!is_continuation && (transport_parsing->incoming_frame_flags &
GRPC_CHTTP2_FLAG_HAS_PRIORITY)) {
grpc_chttp2_hpack_parser_set_has_priority(&transport_parsing->hpack_parser);
}
return GRPC_ERROR_NONE;
}
static grpc_error *init_window_update_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing) {
grpc_error *err = grpc_chttp2_window_update_parser_begin_frame(
&transport_parsing->simple.window_update,
transport_parsing->incoming_frame_size,
transport_parsing->incoming_frame_flags);
if (err != GRPC_ERROR_NONE) return err;
if (transport_parsing->incoming_stream_id != 0) {
grpc_chttp2_stream_parsing *stream_parsing =
transport_parsing->incoming_stream = grpc_chttp2_parsing_lookup_stream(
transport_parsing, transport_parsing->incoming_stream_id);
if (stream_parsing == NULL) {
return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
}
stream_parsing->stats.incoming.framing_bytes += 9;
}
transport_parsing->parser = grpc_chttp2_window_update_parser_parse;
transport_parsing->parser_data = &transport_parsing->simple.window_update;
return GRPC_ERROR_NONE;
}
static grpc_error *init_ping_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing) {
grpc_error *err = grpc_chttp2_ping_parser_begin_frame(
&transport_parsing->simple.ping, transport_parsing->incoming_frame_size,
transport_parsing->incoming_frame_flags);
if (err != GRPC_ERROR_NONE) return err;
transport_parsing->parser = grpc_chttp2_ping_parser_parse;
transport_parsing->parser_data = &transport_parsing->simple.ping;
return GRPC_ERROR_NONE;
}
static grpc_error *init_rst_stream_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing) {
grpc_error *err = grpc_chttp2_rst_stream_parser_begin_frame(
&transport_parsing->simple.rst_stream,
transport_parsing->incoming_frame_size,
transport_parsing->incoming_frame_flags);
if (err != GRPC_ERROR_NONE) return err;
grpc_chttp2_stream_parsing *stream_parsing =
transport_parsing->incoming_stream = grpc_chttp2_parsing_lookup_stream(
transport_parsing, transport_parsing->incoming_stream_id);
if (!transport_parsing->incoming_stream) {
return init_skip_frame_parser(exec_ctx, transport_parsing, 0);
}
stream_parsing->stats.incoming.framing_bytes += 9;
transport_parsing->parser = grpc_chttp2_rst_stream_parser_parse;
transport_parsing->parser_data = &transport_parsing->simple.rst_stream;
return GRPC_ERROR_NONE;
}
static grpc_error *init_goaway_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing) {
grpc_error *err = grpc_chttp2_goaway_parser_begin_frame(
&transport_parsing->goaway_parser, transport_parsing->incoming_frame_size,
transport_parsing->incoming_frame_flags);
if (err != GRPC_ERROR_NONE) return err;
transport_parsing->parser = grpc_chttp2_goaway_parser_parse;
transport_parsing->parser_data = &transport_parsing->goaway_parser;
return GRPC_ERROR_NONE;
}
static grpc_error *init_settings_frame_parser(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing) {
if (transport_parsing->incoming_stream_id != 0) {
return GRPC_ERROR_CREATE("Settings frame received for grpc_chttp2_stream");
}
grpc_error *err = grpc_chttp2_settings_parser_begin_frame(
&transport_parsing->simple.settings,
transport_parsing->incoming_frame_size,
transport_parsing->incoming_frame_flags, transport_parsing->settings);
if (err != GRPC_ERROR_NONE) {
return err;
}
if (transport_parsing->incoming_frame_flags & GRPC_CHTTP2_FLAG_ACK) {
transport_parsing->settings_ack_received = 1;
grpc_chttp2_hptbl_set_max_bytes(
&transport_parsing->hpack_parser.table,
transport_parsing
->last_sent_settings[GRPC_CHTTP2_SETTINGS_HEADER_TABLE_SIZE]);
transport_parsing->max_frame_size =
transport_parsing
->last_sent_settings[GRPC_CHTTP2_SETTINGS_MAX_FRAME_SIZE];
}
transport_parsing->parser = grpc_chttp2_settings_parser_parse;
transport_parsing->parser_data = &transport_parsing->simple.settings;
return GRPC_ERROR_NONE;
}
/*
static int is_window_update_legal(int64_t window_update, int64_t window) {
return window + window_update < MAX_WINDOW;
}
*/
static grpc_error *parse_frame_slice(
grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_parsing *transport_parsing,
gpr_slice slice, int is_last) {
grpc_chttp2_stream_parsing *stream_parsing =
transport_parsing->incoming_stream;
grpc_error *err = transport_parsing->parser(
exec_ctx, transport_parsing->parser_data, transport_parsing,
stream_parsing, slice, is_last);
if (err == GRPC_ERROR_NONE) {
if (stream_parsing) {
grpc_chttp2_list_add_parsing_seen_stream(transport_parsing,
stream_parsing);
}
return GRPC_ERROR_NONE;
} else if (grpc_error_get_int(err, GRPC_ERROR_INT_STREAM_ID, NULL)) {
if (grpc_http_trace) {
const char *msg = grpc_error_string(err);
gpr_log(GPR_ERROR, "%s", msg);
grpc_error_free_string(msg);
}
grpc_chttp2_parsing_become_skip_parser(exec_ctx, transport_parsing);
if (stream_parsing) {
stream_parsing->forced_close_error = err;
gpr_slice_buffer_add(
&transport_parsing->qbuf,
grpc_chttp2_rst_stream_create(transport_parsing->incoming_stream_id,
GRPC_CHTTP2_PROTOCOL_ERROR,
&stream_parsing->stats.outgoing));
} else {
GRPC_ERROR_UNREF(err);
}
}
return err;
}
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