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Source file src/net/sockopt_bsd.go

Documentation: net

  // Copyright 2011 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  // +build darwin dragonfly freebsd netbsd openbsd
  
  package net
  
  import (
  	"os"
  	"runtime"
  	"syscall"
  )
  
  func setDefaultSockopts(s, family, sotype int, ipv6only bool) error {
  	if runtime.GOOS == "dragonfly" && sotype != syscall.SOCK_RAW {
  		// On DragonFly BSD, we adjust the ephemeral port
  		// range because unlike other BSD systems its default
  		// port range doesn't conform to IANA recommendation
  		// as described in RFC 6056 and is pretty narrow.
  		switch family {
  		case syscall.AF_INET:
  			syscall.SetsockoptInt(s, syscall.IPPROTO_IP, syscall.IP_PORTRANGE, syscall.IP_PORTRANGE_HIGH)
  		case syscall.AF_INET6:
  			syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_PORTRANGE, syscall.IPV6_PORTRANGE_HIGH)
  		}
  	}
  	if supportsIPv4map() && family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
  		// Allow both IP versions even if the OS default
  		// is otherwise. Note that some operating systems
  		// never admit this option.
  		syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
  	}
  	// Allow broadcast.
  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
  }
  
  func setDefaultListenerSockopts(s int) error {
  	// Allow reuse of recently-used addresses.
  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
  }
  
  func setDefaultMulticastSockopts(s int) error {
  	// Allow multicast UDP and raw IP datagram sockets to listen
  	// concurrently across multiple listeners.
  	if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
  		return os.NewSyscallError("setsockopt", err)
  	}
  	// Allow reuse of recently-used ports.
  	// This option is supported only in descendants of 4.4BSD,
  	// to make an effective multicast application that requires
  	// quick draw possible.
  	return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1))
  }
  

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