51 lines
1 KiB
Go
51 lines
1 KiB
Go
package dialer
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import (
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"net"
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"syscall"
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"golang.org/x/sys/unix"
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)
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type controlFn = func(network, address string, c syscall.RawConn) error
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func bindControl(ifaceName string, chain controlFn) controlFn {
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return func(network, address string, c syscall.RawConn) (err error) {
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defer func() {
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if err == nil && chain != nil {
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err = chain(network, address, c)
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}
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}()
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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
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}
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}
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var innerErr error
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err = c.Control(func(fd uintptr) {
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innerErr = unix.BindToDevice(int(fd), ifaceName)
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})
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if innerErr != nil {
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err = innerErr
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}
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return
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}
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}
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func bindIfaceToDialer(ifaceName string, dialer *net.Dialer, _ string, _ net.IP) error {
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dialer.Control = bindControl(ifaceName, dialer.Control)
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return nil
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}
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func bindIfaceToListenConfig(ifaceName string, lc *net.ListenConfig, _, address string) (string, error) {
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lc.Control = bindControl(ifaceName, lc.Control)
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return address, nil
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}
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