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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 <grpc/support/port_platform.h>
#ifdef GPR_WINSOCK_SOCKET
#include "src/core/iomgr/sockaddr_win32.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/log_win32.h>
#include <grpc/support/slice_buffer.h>
#include <grpc/support/useful.h>
#include "src/core/iomgr/alarm.h"
#include "src/core/iomgr/iocp_windows.h"
#include "src/core/iomgr/tcp_client.h"
#include "src/core/iomgr/tcp_windows.h"
#include "src/core/iomgr/sockaddr.h"
#include "src/core/iomgr/sockaddr_utils.h"
#include "src/core/iomgr/socket_windows.h"
typedef struct {
void (*cb)(void *arg, grpc_endpoint *tcp);
void *cb_arg;
gpr_mu mu;
grpc_winsocket *socket;
gpr_timespec deadline;
grpc_alarm alarm;
char *addr_name;
int refs;
} async_connect;
static void async_connect_unlock_and_cleanup(async_connect *ac) {
int done = (--ac->refs == 0);
gpr_mu_unlock(&ac->mu);
if (done) {
if (ac->socket != NULL) grpc_winsocket_destroy(ac->socket);
gpr_mu_destroy(&ac->mu);
gpr_free(ac->addr_name);
gpr_free(ac);
}
}
static void on_alarm(void *acp, int occured) {
async_connect *ac = acp;
gpr_mu_lock(&ac->mu);
/* If the alarm didn't occur, it got cancelled. */
gpr_log(GPR_DEBUG, "on_alarm: %p", ac->socket);
if (ac->socket != NULL && occured) {
grpc_winsocket_shutdown(ac->socket);
}
async_connect_unlock_and_cleanup(ac);
}
static void on_connect(void *acp, int from_iocp) {
async_connect *ac = acp;
SOCKET sock = ac->socket->socket;
grpc_endpoint *ep = NULL;
grpc_winsocket_callback_info *info = &ac->socket->write_info;
void (*cb)(void *arg, grpc_endpoint *tcp) = ac->cb;
void *cb_arg = ac->cb_arg;
grpc_alarm_cancel(&ac->alarm);
gpr_mu_lock(&ac->mu);
gpr_log(GPR_DEBUG, "on_connect: %p", ac->socket);
if (from_iocp) {
DWORD transfered_bytes = 0;
DWORD flags;
BOOL wsa_success = WSAGetOverlappedResult(sock, &info->overlapped,
&transfered_bytes, FALSE, &flags);
GPR_ASSERT(transfered_bytes == 0);
if (!wsa_success) {
char *utf8_message = gpr_format_message(WSAGetLastError());
gpr_log(GPR_ERROR, "on_connect error: %s", utf8_message);
gpr_free(utf8_message);
} else {
ep = grpc_tcp_create(ac->socket, ac->addr_name);
ac->socket = NULL;
}
}
async_connect_unlock_and_cleanup(ac);
/* If the connection was aborted, the callback was already called when
the deadline was met. */
cb(cb_arg, ep);
}
/* Tries to issue one async connection, then schedules both an IOCP
notification request for the connection, and one timeout alert. */
void grpc_tcp_client_connect(void (*cb)(void *arg, grpc_endpoint *tcp),
void *arg, grpc_pollset_set *interested_parties,
const struct sockaddr *addr, int addr_len,
gpr_timespec deadline) {
SOCKET sock = INVALID_SOCKET;
BOOL success;
int status;
struct sockaddr_in6 addr6_v4mapped;
struct sockaddr_in6 local_address;
async_connect *ac;
grpc_winsocket *socket = NULL;
LPFN_CONNECTEX ConnectEx;
GUID guid = WSAID_CONNECTEX;
DWORD ioctl_num_bytes;
const char *message = NULL;
char *utf8_message;
grpc_winsocket_callback_info *info;
/* Use dualstack sockets where available. */
if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) {
addr = (const struct sockaddr *)&addr6_v4mapped;
addr_len = sizeof(addr6_v4mapped);
}
sock = WSASocket(AF_INET6, SOCK_STREAM, IPPROTO_TCP, NULL, 0,
WSA_FLAG_OVERLAPPED);
if (sock == INVALID_SOCKET) {
message = "Unable to create socket: %s";
goto failure;
}
if (!grpc_tcp_prepare_socket(sock)) {
message = "Unable to set socket options: %s";
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) {
message = "Unable to retrieve ConnectEx pointer: %s";
goto failure;
}
grpc_sockaddr_make_wildcard6(0, &local_address);
status = bind(sock, (struct sockaddr *)&local_address, sizeof(local_address));
if (status != 0) {
message = "Unable to bind socket: %s";
goto failure;
}
socket = grpc_winsocket_create(sock, "client");
info = &socket->write_info;
success = ConnectEx(sock, addr, 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 error = WSAGetLastError();
if (error != ERROR_IO_PENDING) {
message = "ConnectEx failed: %s";
goto failure;
}
}
ac = gpr_malloc(sizeof(async_connect));
ac->cb = cb;
ac->cb_arg = arg;
ac->socket = socket;
gpr_mu_init(&ac->mu);
ac->refs = 2;
ac->addr_name = grpc_sockaddr_to_uri(addr);
grpc_alarm_init(&ac->alarm, deadline, on_alarm, ac,
gpr_now(GPR_CLOCK_MONOTONIC));
grpc_socket_notify_on_write(socket, on_connect, ac);
return;
failure:
utf8_message = gpr_format_message(WSAGetLastError());
gpr_log(GPR_ERROR, message, utf8_message);
gpr_free(utf8_message);
if (socket != NULL) {
grpc_winsocket_destroy(socket);
} else if (sock != INVALID_SOCKET) {
closesocket(sock);
}
cb(arg, NULL);
}
#endif /* GPR_WINSOCK_SOCKET */
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