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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_ping.h"
#include "src/core/transport/chttp2/internal.h"
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
gpr_slice
grpc_chttp2_ping_create (gpr_uint8 ack, gpr_uint8 * opaque_8bytes)
{
gpr_slice slice = gpr_slice_malloc (9 + 8);
gpr_uint8 *p = GPR_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;
memcpy (p, opaque_8bytes, 8);
return slice;
}
grpc_chttp2_parse_error
grpc_chttp2_ping_parser_begin_frame (grpc_chttp2_ping_parser * parser, gpr_uint32 length, gpr_uint8 flags)
{
if (flags & 0xfe || length != 8)
{
gpr_log (GPR_ERROR, "invalid ping: length=%d, flags=%02x", length, flags);
return GRPC_CHTTP2_CONNECTION_ERROR;
}
parser->byte = 0;
parser->is_ack = flags;
return GRPC_CHTTP2_PARSE_OK;
}
grpc_chttp2_parse_error
grpc_chttp2_ping_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)
{
gpr_uint8 *const beg = GPR_SLICE_START_PTR (slice);
gpr_uint8 *const end = GPR_SLICE_END_PTR (slice);
gpr_uint8 *cur = beg;
grpc_chttp2_ping_parser *p = parser;
grpc_chttp2_outstanding_ping *ping;
while (p->byte != 8 && cur != end)
{
p->opaque_8bytes[p->byte] = *cur;
cur++;
p->byte++;
}
if (p->byte == 8)
{
GPR_ASSERT (is_last);
if (p->is_ack)
{
for (ping = transport_parsing->pings.next; ping != &transport_parsing->pings; ping = ping->next)
{
if (0 == memcmp (p->opaque_8bytes, ping->id, 8))
{
grpc_exec_ctx_enqueue (exec_ctx, ping->on_recv, 1);
}
ping->next->prev = ping->prev;
ping->prev->next = ping->next;
gpr_free (ping);
}
}
else
{
gpr_slice_buffer_add (&transport_parsing->qbuf, grpc_chttp2_ping_create (1, p->opaque_8bytes));
}
}
return GRPC_CHTTP2_PARSE_OK;
}
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