134 lines
2.7 KiB
Go
134 lines
2.7 KiB
Go
// Copyright 2009 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.
|
|
|
|
//go:build aix || darwin || dragonfly || freebsd || hurd || linux || netbsd || openbsd || solaris || windows
|
|
|
|
package net
|
|
|
|
import (
|
|
"internal/bytealg"
|
|
"runtime"
|
|
"syscall"
|
|
)
|
|
|
|
// Boolean to int.
|
|
func boolint(b bool) int {
|
|
if b {
|
|
return 1
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func ipv4AddrToInterface(ip IP) (*Interface, error) {
|
|
ift, err := Interfaces()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, ifi := range ift {
|
|
ifat, err := ifi.Addrs()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, ifa := range ifat {
|
|
switch v := ifa.(type) {
|
|
case *IPAddr:
|
|
if ip.Equal(v.IP) {
|
|
return &ifi, nil
|
|
}
|
|
case *IPNet:
|
|
if ip.Equal(v.IP) {
|
|
return &ifi, nil
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if ip.Equal(IPv4zero) {
|
|
return nil, nil
|
|
}
|
|
return nil, errNoSuchInterface
|
|
}
|
|
|
|
func interfaceToIPv4Addr(ifi *Interface) (IP, error) {
|
|
if ifi == nil {
|
|
return IPv4zero, nil
|
|
}
|
|
ifat, err := ifi.Addrs()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
for _, ifa := range ifat {
|
|
switch v := ifa.(type) {
|
|
case *IPAddr:
|
|
if v.IP.To4() != nil {
|
|
return v.IP, nil
|
|
}
|
|
case *IPNet:
|
|
if v.IP.To4() != nil {
|
|
return v.IP, nil
|
|
}
|
|
}
|
|
}
|
|
return nil, errNoSuchInterface
|
|
}
|
|
|
|
func setIPv4MreqToInterface(mreq *syscall.IPMreq, ifi *Interface) error {
|
|
if ifi == nil {
|
|
return nil
|
|
}
|
|
ifat, err := ifi.Addrs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, ifa := range ifat {
|
|
switch v := ifa.(type) {
|
|
case *IPAddr:
|
|
if a := v.IP.To4(); a != nil {
|
|
copy(mreq.Interface[:], a)
|
|
goto done
|
|
}
|
|
case *IPNet:
|
|
if a := v.IP.To4(); a != nil {
|
|
copy(mreq.Interface[:], a)
|
|
goto done
|
|
}
|
|
}
|
|
}
|
|
done:
|
|
if bytealg.Equal(mreq.Multiaddr[:], IPv4zero.To4()) {
|
|
return errNoSuchMulticastInterface
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func setReadBuffer(fd *netFD, bytes int) error {
|
|
err := fd.pfd.SetsockoptInt(syscall.SOL_SOCKET, syscall.SO_RCVBUF, bytes)
|
|
runtime.KeepAlive(fd)
|
|
return wrapSyscallError("setsockopt", err)
|
|
}
|
|
|
|
func setWriteBuffer(fd *netFD, bytes int) error {
|
|
err := fd.pfd.SetsockoptInt(syscall.SOL_SOCKET, syscall.SO_SNDBUF, bytes)
|
|
runtime.KeepAlive(fd)
|
|
return wrapSyscallError("setsockopt", err)
|
|
}
|
|
|
|
func setKeepAlive(fd *netFD, keepalive bool) error {
|
|
err := fd.pfd.SetsockoptInt(syscall.SOL_SOCKET, syscall.SO_KEEPALIVE, boolint(keepalive))
|
|
runtime.KeepAlive(fd)
|
|
return wrapSyscallError("setsockopt", err)
|
|
}
|
|
|
|
func setLinger(fd *netFD, sec int) error {
|
|
var l syscall.Linger
|
|
if sec >= 0 {
|
|
l.Onoff = 1
|
|
l.Linger = int32(sec)
|
|
} else {
|
|
l.Onoff = 0
|
|
l.Linger = 0
|
|
}
|
|
err := fd.pfd.SetsockoptLinger(syscall.SOL_SOCKET, syscall.SO_LINGER, &l)
|
|
runtime.KeepAlive(fd)
|
|
return wrapSyscallError("setsockopt", err)
|
|
}
|