mirror of https://github.com/Dreamacro/clash.git
54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
package dialer
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import (
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"net"
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"syscall"
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)
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type controlFn = func(network, address string, c syscall.RawConn) error
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func bindControl(ifaceIdx int) controlFn {
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return func(network, address string, c syscall.RawConn) error {
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ipStr, _, err := net.SplitHostPort(address)
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if err == nil {
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ip := net.ParseIP(ipStr)
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if ip != nil && !ip.IsGlobalUnicast() {
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return nil
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}
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}
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return c.Control(func(fd uintptr) {
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switch network {
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case "tcp4", "udp4":
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syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_BOUND_IF, ifaceIdx)
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case "tcp6", "udp6":
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syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IPV6, syscall.IPV6_BOUND_IF, ifaceIdx)
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}
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})
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}
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}
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func bindIfaceToDialer(dialer *net.Dialer, ifaceName string) error {
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iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
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return net.InterfaceByName(ifaceName)
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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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dialer.Control = bindControl(iface.(*net.Interface).Index)
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return nil
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}
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func bindIfaceToListenConfig(lc *net.ListenConfig, ifaceName string) error {
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iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
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return net.InterfaceByName(ifaceName)
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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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lc.Control = bindControl(iface.(*net.Interface).Index)
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return nil
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}
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