Source file src/net/sockopt_bsd.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	// +build darwin dragonfly freebsd netbsd openbsd
     6	
     7	package net
     8	
     9	import (
    10		"os"
    11		"runtime"
    12		"syscall"
    13	)
    14	
    15	func setDefaultSockopts(s, family, sotype int, ipv6only bool) error {
    16		if runtime.GOOS == "dragonfly" && sotype != syscall.SOCK_RAW {
    17			// On DragonFly BSD, we adjust the ephemeral port
    18			// range because unlike other BSD systems its default
    19			// port range doesn't conform to IANA recommendation
    20			// as described in RFC 6056 and is pretty narrow.
    21			switch family {
    22			case syscall.AF_INET:
    23				syscall.SetsockoptInt(s, syscall.IPPROTO_IP, syscall.IP_PORTRANGE, syscall.IP_PORTRANGE_HIGH)
    24			case syscall.AF_INET6:
    25				syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_PORTRANGE, syscall.IPV6_PORTRANGE_HIGH)
    26			}
    27		}
    28		if supportsIPv4map() && family == syscall.AF_INET6 && sotype != syscall.SOCK_RAW {
    29			// Allow both IP versions even if the OS default
    30			// is otherwise. Note that some operating systems
    31			// never admit this option.
    32			syscall.SetsockoptInt(s, syscall.IPPROTO_IPV6, syscall.IPV6_V6ONLY, boolint(ipv6only))
    33		}
    34		// Allow broadcast.
    35		return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_BROADCAST, 1))
    36	}
    37	
    38	func setDefaultListenerSockopts(s int) error {
    39		// Allow reuse of recently-used addresses.
    40		return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1))
    41	}
    42	
    43	func setDefaultMulticastSockopts(s int) error {
    44		// Allow multicast UDP and raw IP datagram sockets to listen
    45		// concurrently across multiple listeners.
    46		if err := syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
    47			return os.NewSyscallError("setsockopt", err)
    48		}
    49		// Allow reuse of recently-used ports.
    50		// This option is supported only in descendants of 4.4BSD,
    51		// to make an effective multicast application that requires
    52		// quick draw possible.
    53		return os.NewSyscallError("setsockopt", syscall.SetsockoptInt(s, syscall.SOL_SOCKET, syscall.SO_REUSEPORT, 1))
    54	}
    55	

View as plain text