118 lines
2.2 KiB
Go
118 lines
2.2 KiB
Go
package dialer
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import (
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"errors"
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"net"
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"time"
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"github.com/Dreamacro/clash/common/singledo"
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)
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// In some OS, such as Windows, it takes a little longer to get interface information
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var ifaceSingle = singledo.NewSingle(time.Second * 20)
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var (
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errPlatformNotSupport = errors.New("unsupport platform")
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)
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func lookupTCPAddr(ip net.IP, addrs []net.Addr) (*net.TCPAddr, error) {
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ipv4 := ip.To4() != nil
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for _, elm := range addrs {
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addr, ok := elm.(*net.IPNet)
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if !ok {
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continue
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}
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addrV4 := addr.IP.To4() != nil
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if addrV4 && ipv4 {
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return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
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} else if !addrV4 && !ipv4 {
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return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
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}
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}
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return nil, ErrAddrNotFound
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}
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func lookupUDPAddr(ip net.IP, addrs []net.Addr) (*net.UDPAddr, error) {
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ipv4 := ip.To4() != nil
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for _, elm := range addrs {
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addr, ok := elm.(*net.IPNet)
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if !ok {
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continue
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}
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addrV4 := addr.IP.To4() != nil
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if addrV4 && ipv4 {
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return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
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} else if !addrV4 && !ipv4 {
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return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
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}
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}
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return nil, ErrAddrNotFound
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}
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func fallbackBindToDialer(dialer *net.Dialer, network string, ip net.IP, name string) error {
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if !ip.IsGlobalUnicast() {
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return nil
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}
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iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
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return net.InterfaceByName(name)
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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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addrs, err := iface.(*net.Interface).Addrs()
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if err != nil {
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return err
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}
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switch network {
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case "tcp", "tcp4", "tcp6":
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if addr, err := lookupTCPAddr(ip, addrs); err == nil {
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dialer.LocalAddr = addr
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} else {
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return err
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}
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case "udp", "udp4", "udp6":
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if addr, err := lookupUDPAddr(ip, addrs); err == nil {
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dialer.LocalAddr = addr
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} else {
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return err
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}
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}
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return nil
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}
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func fallbackBindToListenConfig(name string) (string, error) {
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iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
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return net.InterfaceByName(name)
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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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addrs, err := iface.(*net.Interface).Addrs()
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if err != nil {
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return "", err
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}
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for _, elm := range addrs {
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addr, ok := elm.(*net.IPNet)
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if !ok || addr.IP.To4() == nil {
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continue
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}
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return net.JoinHostPort(addr.IP.String(), "0"), nil
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}
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return "", ErrAddrNotFound
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}
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