sockopt_windows.go

     1  // Copyright 2011 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package net
     6  
     7  import (
     8  	"os"
     9  	"syscall"
    10  )
    11  
    12  func setDefaultSockopts(s syscall.Handle, family, sotype int, ipv6only bool) error {
    13  	if family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
    14  		// Allow both IP versions even if the OS default
    15  		// is otherwise. Note that some operating systems
    16  		// never admit this option.
    17  		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
    18  	}
    19  	if (sotype == syscall.SOCK_DGRAM || sotype == syscall.SOCK_RAW) && family != syscall.AF_UNIX && family != syscall.AF_INET6 {
    20  		// Allow broadcast.
    21  		return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
    22  	}
    23  	return nil
    24  }
    25  
    26  func setDefaultListenerSockopts(s syscall.Handle) error {
    27  	// Windows will reuse recently-used addresses by default.
    28  	// SO_REUSEADDR should not be used here, as it allows
    29  	// a socket to forcibly bind to a port in use by another socket.
    30  	// This could lead to a non-deterministic behavior, where
    31  	// connection requests over the port cannot be guaranteed
    32  	// to be handled by the correct socket.
    33  	return nil
    34  }
    35  
    36  func setDefaultMulticastSockopts(s syscall.Handle) error {
    37  	// Allow multicast UDP and raw IP datagram sockets to listen
    38  	// concurrently across multiple listeners.
    39  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
    40  }
    41
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