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v2fly/testing/servers/udp/port.go

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2017-11-14 17:45:07 -05:00
package udp
import (
"v2ray.com/core/common"
"v2ray.com/core/common/net"
)
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// PickPort returns an unused UDP port in the system. The port returned is highly likely to be unused, but not guaranteed.
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func PickPort() net.Port {
conn, err := net.ListenUDP("udp4", &net.UDPAddr{
IP: net.LocalHostIP.IP(),
Port: 0,
})
common.Must(err)
defer conn.Close()
addr := conn.LocalAddr().(*net.UDPAddr)
return net.Port(addr.Port)
}