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mirror of https://github.com/v2fly/v2ray-core.git synced 2024-10-31 16:27:41 -04:00
v2fly/common/buf/readv_constraint_windows.go
2019-05-18 15:09:58 +08:00

38 lines
954 B
Go

// +build windows
package buf
import (
"syscall"
)
func checkReadVConstraint(conn syscall.RawConn) (bool, error) {
var isSocketReady = false
var reason error
/*
In Windows, WSARecv system call only support socket connection.
It it required to check if the given fd is of a socket type
Fix https://github.com/v2ray/v2ray-core/issues/1666
Additional Information:
https://docs.microsoft.com/en-us/windows/desktop/api/winsock2/nf-winsock2-wsarecv
https://docs.microsoft.com/en-us/windows/desktop/api/winsock/nf-winsock-getsockopt
https://docs.microsoft.com/en-us/windows/desktop/WinSock/sol-socket-socket-options
*/
err := conn.Control(func(fd uintptr) {
var val [4]byte
var le = int32(len(val))
err := syscall.Getsockopt(syscall.Handle(fd), syscall.SOL_SOCKET, syscall.SO_RCVBUF, &val[0], &le)
if err != nil {
isSocketReady = false
} else {
isSocketReady = true
}
reason = err
})
return isSocketReady, err
}