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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/transport/chttp2/frame_settings.h"
#include <string.h>
#include "src/core/transport/chttp2/frame.h"
#include <grpc/support/log.h>
#include <grpc/support/useful.h>
/* HTTP/2 mandated initial connection settings */
const grpc_chttp2_setting_parameters
grpc_chttp2_settings_parameters[GRPC_CHTTP2_NUM_SETTINGS] = {
{NULL, 0, 0, 0, GRPC_CHTTP2_DISCONNECT_ON_INVALID_VALUE},
{"HEADER_TABLE_SIZE", 4096, 0, 0xffffffff,
GRPC_CHTTP2_CLAMP_INVALID_VALUE},
{"ENABLE_PUSH", 1, 0, 1, GRPC_CHTTP2_DISCONNECT_ON_INVALID_VALUE},
{"MAX_CONCURRENT_STREAMS", 0xffffffffu, 0, 0xffffffffu,
GRPC_CHTTP2_DISCONNECT_ON_INVALID_VALUE},
{"INITIAL_WINDOW_SIZE", 65535, 0, 0xffffffffu,
GRPC_CHTTP2_DISCONNECT_ON_INVALID_VALUE},
{"MAX_FRAME_SIZE", 16384, 16384, 16777215,
GRPC_CHTTP2_DISCONNECT_ON_INVALID_VALUE},
{"MAX_HEADER_LIST_SIZE", 0xffffffffu, 0, 0xffffffffu,
GRPC_CHTTP2_CLAMP_INVALID_VALUE}, };
static gpr_uint8 *fill_header(gpr_uint8 *out, gpr_uint32 length,
gpr_uint8 flags) {
*out++ = length >> 16;
*out++ = length >> 8;
*out++ = length;
*out++ = GRPC_CHTTP2_FRAME_SETTINGS;
*out++ = flags;
*out++ = 0;
*out++ = 0;
*out++ = 0;
*out++ = 0;
return out;
}
gpr_slice grpc_chttp2_settings_create(gpr_uint32 *old, const gpr_uint32 *new,
gpr_uint32 force_mask, size_t count) {
size_t i;
size_t n = 0;
gpr_slice output;
gpr_uint8 *p;
for (i = 0; i < count; i++) {
n += (new[i] != old[i] || (force_mask & (1 << i)) != 0);
}
output = gpr_slice_malloc(9 + 6 * n);
p = fill_header(GPR_SLICE_START_PTR(output), 6 * n, 0);
for (i = 0; i < count; i++) {
if (new[i] != old[i] || (force_mask & (1 << i)) != 0) {
GPR_ASSERT(i);
*p++ = i >> 8;
*p++ = i;
*p++ = new[i] >> 24;
*p++ = new[i] >> 16;
*p++ = new[i] >> 8;
*p++ = new[i];
old[i] = new[i];
}
}
GPR_ASSERT(p == GPR_SLICE_END_PTR(output));
return output;
}
gpr_slice grpc_chttp2_settings_ack_create(void) {
gpr_slice output = gpr_slice_malloc(9);
fill_header(GPR_SLICE_START_PTR(output), 0, GRPC_CHTTP2_FLAG_ACK);
return output;
}
grpc_chttp2_parse_error grpc_chttp2_settings_parser_begin_frame(
grpc_chttp2_settings_parser *parser, gpr_uint32 length, gpr_uint8 flags,
gpr_uint32 *settings) {
parser->target_settings = settings;
memcpy(parser->incoming_settings, settings,
GRPC_CHTTP2_NUM_SETTINGS * sizeof(gpr_uint32));
parser->is_ack = 0;
parser->state = GRPC_CHTTP2_SPS_ID0;
if (flags == GRPC_CHTTP2_FLAG_ACK) {
parser->is_ack = 1;
if (length != 0) {
gpr_log(GPR_ERROR, "non-empty settings ack frame received");
return GRPC_CHTTP2_CONNECTION_ERROR;
}
return GRPC_CHTTP2_PARSE_OK;
} else if (flags != 0) {
gpr_log(GPR_ERROR, "invalid flags on settings frame");
return GRPC_CHTTP2_CONNECTION_ERROR;
} else if (length % 6 != 0) {
gpr_log(GPR_ERROR, "settings frames must be a multiple of six bytes");
return GRPC_CHTTP2_CONNECTION_ERROR;
} else {
return GRPC_CHTTP2_PARSE_OK;
}
}
grpc_chttp2_parse_error grpc_chttp2_settings_parser_parse(
void *p, grpc_chttp2_parse_state *state, gpr_slice slice, int is_last) {
grpc_chttp2_settings_parser *parser = p;
const gpr_uint8 *cur = GPR_SLICE_START_PTR(slice);
const gpr_uint8 *end = GPR_SLICE_END_PTR(slice);
if (parser->is_ack) {
return GRPC_CHTTP2_PARSE_OK;
}
for (;;) {
switch (parser->state) {
case GRPC_CHTTP2_SPS_ID0:
if (cur == end) {
parser->state = GRPC_CHTTP2_SPS_ID0;
if (is_last) {
memcpy(parser->target_settings, parser->incoming_settings,
GRPC_CHTTP2_NUM_SETTINGS * sizeof(gpr_uint32));
state->ack_settings = 1;
}
return GRPC_CHTTP2_PARSE_OK;
}
parser->id = ((gpr_uint16) * cur) << 8;
cur++;
/* fallthrough */
case GRPC_CHTTP2_SPS_ID1:
if (cur == end) {
parser->state = GRPC_CHTTP2_SPS_ID1;
return GRPC_CHTTP2_PARSE_OK;
}
parser->id |= (*cur);
cur++;
/* fallthrough */
case GRPC_CHTTP2_SPS_VAL0:
if (cur == end) {
parser->state = GRPC_CHTTP2_SPS_VAL0;
return GRPC_CHTTP2_PARSE_OK;
}
parser->value = ((gpr_uint32) * cur) << 24;
cur++;
/* fallthrough */
case GRPC_CHTTP2_SPS_VAL1:
if (cur == end) {
parser->state = GRPC_CHTTP2_SPS_VAL1;
return GRPC_CHTTP2_PARSE_OK;
}
parser->value |= ((gpr_uint32) * cur) << 16;
cur++;
/* fallthrough */
case GRPC_CHTTP2_SPS_VAL2:
if (cur == end) {
parser->state = GRPC_CHTTP2_SPS_VAL2;
return GRPC_CHTTP2_PARSE_OK;
}
parser->value |= ((gpr_uint32) * cur) << 8;
cur++;
/* fallthrough */
case GRPC_CHTTP2_SPS_VAL3:
if (cur == end) {
parser->state = GRPC_CHTTP2_SPS_VAL3;
return GRPC_CHTTP2_PARSE_OK;
} else {
parser->state = GRPC_CHTTP2_SPS_ID0;
}
parser->value |= *cur;
cur++;
if (parser->id > 0 && parser->id < GRPC_CHTTP2_NUM_SETTINGS) {
const grpc_chttp2_setting_parameters *sp =
&grpc_chttp2_settings_parameters[parser->id];
if (parser->value < sp->min_value || parser->value > sp->max_value) {
switch (sp->invalid_value_behavior) {
case GRPC_CHTTP2_CLAMP_INVALID_VALUE:
parser->value =
GPR_CLAMP(parser->value, sp->min_value, sp->max_value);
break;
case GRPC_CHTTP2_DISCONNECT_ON_INVALID_VALUE:
gpr_log(GPR_ERROR, "invalid value %u passed for %s",
parser->value, sp->name);
return GRPC_CHTTP2_CONNECTION_ERROR;
}
}
parser->incoming_settings[parser->id] = parser->value;
gpr_log(GPR_DEBUG, "CHTTP2: got setting %d = %d", parser->id,
parser->value);
} else {
gpr_log(GPR_ERROR, "CHTTP2: Ignoring unknown setting %d (value %d)",
parser->id, parser->value);
}
break;
}
}
}
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