// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
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package net
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import (
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"errors"
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"syscall"
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)
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func readRawConn(c syscall.RawConn, b []byte) (int, error) {
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var operr error
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var n int
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err := c.Read(func(s uintptr) bool {
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n, operr = syscall.Read(int(s), b)
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if operr == syscall.EAGAIN {
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return false
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}
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return true
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})
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if err != nil {
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return n, err
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}
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if operr != nil {
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return n, operr
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}
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return n, nil
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}
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func writeRawConn(c syscall.RawConn, b []byte) error {
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var operr error
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err := c.Write(func(s uintptr) bool {
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_, operr = syscall.Write(int(s), b)
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if operr == syscall.EAGAIN {
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return false
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}
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return true
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})
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if err != nil {
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return err
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}
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if operr != nil {
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return operr
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}
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return nil
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}
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func controlRawConn(c syscall.RawConn, addr Addr) error {
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var operr error
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fn := func(s uintptr) {
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_, operr = syscall.GetsockoptInt(int(s), syscall.SOL_SOCKET, syscall.SO_REUSEADDR)
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if operr != nil {
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return
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}
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switch addr := addr.(type) {
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case *TCPAddr:
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// There's no guarantee that IP-level socket
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// options work well with dual stack sockets.
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// A simple solution would be to take a look
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// at the bound address to the raw connection
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// and to classify the address family of the
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// underlying socket by the bound address:
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//
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// - When IP.To16() != nil and IP.To4() == nil,
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// we can assume that the raw connection
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// consists of an IPv6 socket using only
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// IPv6 addresses.
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//
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// - When IP.To16() == nil and IP.To4() != nil,
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// the raw connection consists of an IPv4
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// socket using only IPv4 addresses.
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//
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// - Otherwise, the raw connection is a dual
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// stack socket, an IPv6 socket using IPv6
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// addresses including IPv4-mapped or
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// IPv4-embedded IPv6 addresses.
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if addr.IP.To16() != nil && addr.IP.To4() == nil {
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operr = syscall.SetsockoptInt(int(s), syscall.IPPROTO_IPV6, syscall.IPV6_UNICAST_HOPS, 1)
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} else if addr.IP.To16() == nil && addr.IP.To4() != nil {
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operr = syscall.SetsockoptInt(int(s), syscall.IPPROTO_IP, syscall.IP_TTL, 1)
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}
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}
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}
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if err := c.Control(fn); err != nil {
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return err
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}
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if operr != nil {
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return operr
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}
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return nil
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}
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func controlOnConnSetup(network string, address string, c syscall.RawConn) error {
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var operr error
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var fn func(uintptr)
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switch network {
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case "tcp", "udp", "ip":
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return errors.New("ambiguous network: " + network)
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case "unix", "unixpacket", "unixgram":
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fn = func(s uintptr) {
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_, operr = syscall.GetsockoptInt(int(s), syscall.SOL_SOCKET, syscall.SO_ERROR)
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}
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default:
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switch network[len(network)-1] {
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case '4':
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fn = func(s uintptr) {
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operr = syscall.SetsockoptInt(int(s), syscall.IPPROTO_IP, syscall.IP_TTL, 1)
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}
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case '6':
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fn = func(s uintptr) {
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operr = syscall.SetsockoptInt(int(s), syscall.IPPROTO_IPV6, syscall.IPV6_UNICAST_HOPS, 1)
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}
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default:
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return errors.New("unknown network: " + network)
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}
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}
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if err := c.Control(fn); err != nil {
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return err
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}
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if operr != nil {
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return operr
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}
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return nil
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}
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