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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/frame_ping.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>
static bool g_disable_ping_ack = false;
grpc_slice grpc_chttp2_ping_create(uint8_t ack, uint64_t opaque_8bytes) {
grpc_slice slice = GRPC_SLICE_MALLOC(9 + 8);
uint8_t *p = GRPC_SLICE_START_PTR(slice);
*p++ = 0;
*p++ = 0;
*p++ = 8;
*p++ = GRPC_CHTTP2_FRAME_PING;
*p++ = ack ? 1 : 0;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = 0;
*p++ = (uint8_t)(opaque_8bytes >> 56);
*p++ = (uint8_t)(opaque_8bytes >> 48);
*p++ = (uint8_t)(opaque_8bytes >> 40);
*p++ = (uint8_t)(opaque_8bytes >> 32);
*p++ = (uint8_t)(opaque_8bytes >> 24);
*p++ = (uint8_t)(opaque_8bytes >> 16);
*p++ = (uint8_t)(opaque_8bytes >> 8);
*p++ = (uint8_t)(opaque_8bytes);
return slice;
}
grpc_error *grpc_chttp2_ping_parser_begin_frame(grpc_chttp2_ping_parser *parser,
uint32_t length,
uint8_t flags) {
if (flags & 0xfe || length != 8) {
char *msg;
gpr_asprintf(&msg, "invalid ping: length=%d, flags=%02x", length, flags);
grpc_error *error = GRPC_ERROR_CREATE_FROM_COPIED_STRING(msg);
gpr_free(msg);
return error;
}
parser->byte = 0;
parser->is_ack = flags;
parser->opaque_8bytes = 0;
return GRPC_ERROR_NONE;
}
grpc_error *grpc_chttp2_ping_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_ping_parser *p = parser;
while (p->byte != 8 && cur != end) {
p->opaque_8bytes |= (((uint64_t)*cur) << (56 - 8 * p->byte));
cur++;
p->byte++;
}
if (p->byte == 8) {
GPR_ASSERT(is_last);
if (p->is_ack) {
grpc_chttp2_ack_ping(exec_ctx, t, p->opaque_8bytes);
} else {
if (!t->is_client) {
gpr_timespec now = gpr_now(GPR_CLOCK_MONOTONIC);
gpr_timespec next_allowed_ping =
gpr_time_add(t->ping_recv_state.last_ping_recv_time,
t->ping_policy.min_ping_interval_without_data);
if (t->keepalive_permit_without_calls == 0 &&
grpc_chttp2_stream_map_size(&t->stream_map) == 0) {
/* According to RFC1122, the interval of TCP Keep-Alive is default to
no less than two hours. When there is no outstanding streams, we
restrict the number of PINGS equivalent to TCP Keep-Alive. */
next_allowed_ping =
gpr_time_add(t->ping_recv_state.last_ping_recv_time,
gpr_time_from_seconds(7200, GPR_TIMESPAN));
}
if (gpr_time_cmp(next_allowed_ping, now) > 0) {
grpc_chttp2_add_ping_strike(exec_ctx, t);
}
t->ping_recv_state.last_ping_recv_time = now;
}
if (!g_disable_ping_ack) {
if (t->ping_ack_count == t->ping_ack_capacity) {
t->ping_ack_capacity = GPR_MAX(t->ping_ack_capacity * 3 / 2, 3);
t->ping_acks = gpr_realloc(
t->ping_acks, t->ping_ack_capacity * sizeof(*t->ping_acks));
}
t->ping_acks[t->ping_ack_count++] = p->opaque_8bytes;
grpc_chttp2_initiate_write(exec_ctx, t, false, "ping response");
}
}
}
return GRPC_ERROR_NONE;
}
void grpc_set_disable_ping_ack(bool disable_ping_ack) {
g_disable_ping_ack = disable_ping_ack;
}
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