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33 lines
526 B
Go
33 lines
526 B
Go
package wgproxy
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import (
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"fmt"
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"net"
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)
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const (
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portRangeStart = 3128
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portRangeEnd = 3228
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)
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type portLookup struct {
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}
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func (pl portLookup) searchFreePort() (int, error) {
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for i := portRangeStart; i <= portRangeEnd; i++ {
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if pl.tryToBind(i) == nil {
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return i, nil
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}
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}
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return 0, fmt.Errorf("failed to bind free port for eBPF proxy")
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}
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func (pl portLookup) tryToBind(port int) error {
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l, err := net.ListenPacket("udp", fmt.Sprintf(":%d", port))
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if err != nil {
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return err
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}
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_ = l.Close()
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return nil
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}
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