41 lines
907 B
Go
41 lines
907 B
Go
//go:build linux
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package dialer
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import (
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"net"
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"net/netip"
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"syscall"
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)
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func bindMarkToDialer(mark int, dialer *net.Dialer, _ string, _ netip.Addr) {
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dialer.Control = bindMarkToControl(mark, dialer.Control)
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}
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func bindMarkToListenConfig(mark int, lc *net.ListenConfig, _, _ string) {
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lc.Control = bindMarkToControl(mark, lc.Control)
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}
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func bindMarkToControl(mark int, 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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addrPort, err := netip.ParseAddrPort(address)
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if err == nil && !addrPort.Addr().IsGlobalUnicast() {
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return
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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 = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_MARK, mark)
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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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