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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/port_platform.h>
#include "src/core/lib/iomgr/port.h"
#include <inttypes.h>
#ifdef GRPC_WINSOCK_SOCKET
#include "src/core/lib/iomgr/sockaddr_windows.h"
#include <grpc/slice_buffer.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/log_windows.h>
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/iomgr/iocp_windows.h"
#include "src/core/lib/iomgr/sockaddr.h"
#include "src/core/lib/iomgr/sockaddr_utils.h"
#include "src/core/lib/iomgr/socket_windows.h"
#include "src/core/lib/iomgr/tcp_client.h"
#include "src/core/lib/iomgr/tcp_windows.h"
#include "src/core/lib/iomgr/timer.h"
typedef struct {
grpc_closure* on_done;
gpr_mu mu;
grpc_winsocket* socket;
grpc_timer alarm;
grpc_closure on_alarm;
char* addr_name;
int refs;
grpc_closure on_connect;
grpc_endpoint** endpoint;
grpc_channel_args* channel_args;
} async_connect;
static void async_connect_unlock_and_cleanup(async_connect* ac,
grpc_winsocket* socket) {
int done = (--ac->refs == 0);
gpr_mu_unlock(&ac->mu);
if (done) {
grpc_channel_args_destroy(ac->channel_args);
gpr_mu_destroy(&ac->mu);
gpr_free(ac->addr_name);
gpr_free(ac);
}
if (socket != NULL) grpc_winsocket_destroy(socket);
}
static void on_alarm(void* acp, grpc_error* error) {
async_connect* ac = (async_connect*)acp;
gpr_mu_lock(&ac->mu);
grpc_winsocket* socket = ac->socket;
ac->socket = NULL;
if (socket != NULL) {
grpc_winsocket_shutdown(socket);
}
async_connect_unlock_and_cleanup(ac, socket);
}
static void on_connect(void* acp, grpc_error* error) {
async_connect* ac = (async_connect*)acp;
grpc_endpoint** ep = ac->endpoint;
GPR_ASSERT(*ep == NULL);
grpc_closure* on_done = ac->on_done;
GRPC_ERROR_REF(error);
gpr_mu_lock(&ac->mu);
grpc_winsocket* socket = ac->socket;
ac->socket = NULL;
gpr_mu_unlock(&ac->mu);
grpc_timer_cancel(&ac->alarm);
gpr_mu_lock(&ac->mu);
if (error == GRPC_ERROR_NONE) {
if (socket != NULL) {
DWORD transfered_bytes = 0;
DWORD flags;
BOOL wsa_success =
WSAGetOverlappedResult(socket->socket, &socket->write_info.overlapped,
&transfered_bytes, FALSE, &flags);
GPR_ASSERT(transfered_bytes == 0);
if (!wsa_success) {
error = GRPC_WSA_ERROR(WSAGetLastError(), "ConnectEx");
closesocket(socket->socket);
} else {
*ep = grpc_tcp_create(socket, ac->channel_args, ac->addr_name);
socket = NULL;
}
} else {
error = GRPC_ERROR_CREATE_FROM_STATIC_STRING("socket is null");
}
}
async_connect_unlock_and_cleanup(ac, socket);
/* If the connection was aborted, the callback was already called when
the deadline was met. */
GRPC_CLOSURE_SCHED(on_done, error);
}
/* Tries to issue one async connection, then schedules both an IOCP
notification request for the connection, and one timeout alert. */
static void tcp_connect(grpc_closure* on_done, grpc_endpoint** endpoint,
grpc_pollset_set* interested_parties,
const grpc_channel_args* channel_args,
const grpc_resolved_address* addr,
grpc_millis deadline) {
SOCKET sock = INVALID_SOCKET;
BOOL success;
int status;
grpc_resolved_address addr6_v4mapped;
grpc_resolved_address local_address;
async_connect* ac;
grpc_winsocket* socket = NULL;
LPFN_CONNECTEX ConnectEx;
GUID guid = WSAID_CONNECTEX;
DWORD ioctl_num_bytes;
grpc_winsocket_callback_info* info;
grpc_error* error = GRPC_ERROR_NONE;
*endpoint = NULL;
/* Use dualstack sockets where available. */
if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) {
addr = &addr6_v4mapped;
}
sock = WSASocket(AF_INET6, SOCK_STREAM, IPPROTO_TCP, NULL, 0,
WSA_FLAG_OVERLAPPED);
if (sock == INVALID_SOCKET) {
error = GRPC_WSA_ERROR(WSAGetLastError(), "WSASocket");
goto failure;
}
error = grpc_tcp_prepare_socket(sock);
if (error != GRPC_ERROR_NONE) {
goto failure;
}
/* Grab the function pointer for ConnectEx for that specific socket.
It may change depending on the interface. */
status =
WSAIoctl(sock, SIO_GET_EXTENSION_FUNCTION_POINTER, &guid, sizeof(guid),
&ConnectEx, sizeof(ConnectEx), &ioctl_num_bytes, NULL, NULL);
if (status != 0) {
error = GRPC_WSA_ERROR(WSAGetLastError(),
"WSAIoctl(SIO_GET_EXTENSION_FUNCTION_POINTER)");
goto failure;
}
grpc_sockaddr_make_wildcard6(0, &local_address);
status =
bind(sock, (grpc_sockaddr*)&local_address.addr, (int)local_address.len);
if (status != 0) {
error = GRPC_WSA_ERROR(WSAGetLastError(), "bind");
goto failure;
}
socket = grpc_winsocket_create(sock, "client");
info = &socket->write_info;
success = ConnectEx(sock, (grpc_sockaddr*)&addr->addr, (int)addr->len, NULL,
0, NULL, &info->overlapped);
/* It wouldn't be unusual to get a success immediately. But we'll still get
an IOCP notification, so let's ignore it. */
if (!success) {
int last_error = WSAGetLastError();
if (last_error != ERROR_IO_PENDING) {
error = GRPC_WSA_ERROR(last_error, "ConnectEx");
goto failure;
}
}
ac = (async_connect*)gpr_malloc(sizeof(async_connect));
ac->on_done = on_done;
ac->socket = socket;
gpr_mu_init(&ac->mu);
ac->refs = 2;
ac->addr_name = grpc_sockaddr_to_uri(addr);
ac->endpoint = endpoint;
ac->channel_args = grpc_channel_args_copy(channel_args);
GRPC_CLOSURE_INIT(&ac->on_connect, on_connect, ac, grpc_schedule_on_exec_ctx);
GRPC_CLOSURE_INIT(&ac->on_alarm, on_alarm, ac, grpc_schedule_on_exec_ctx);
grpc_timer_init(&ac->alarm, deadline, &ac->on_alarm);
grpc_socket_notify_on_write(socket, &ac->on_connect);
return;
failure:
GPR_ASSERT(error != GRPC_ERROR_NONE);
char* target_uri = grpc_sockaddr_to_uri(addr);
grpc_error* final_error = grpc_error_set_str(
GRPC_ERROR_CREATE_REFERENCING_FROM_STATIC_STRING("Failed to connect",
&error, 1),
GRPC_ERROR_STR_TARGET_ADDRESS, grpc_slice_from_copied_string(target_uri));
GRPC_ERROR_UNREF(error);
if (socket != NULL) {
grpc_winsocket_destroy(socket);
} else if (sock != INVALID_SOCKET) {
closesocket(sock);
}
GRPC_CLOSURE_SCHED(on_done, final_error);
}
grpc_tcp_client_vtable grpc_windows_tcp_client_vtable = {tcp_connect};
#endif /* GRPC_WINSOCK_SOCKET */
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