mirror of https://github.com/poanetwork/gecko.git
49 lines
816 B
Go
49 lines
816 B
Go
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package nat
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import (
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"fmt"
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"net"
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"time"
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)
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const googleDNSServer = "8.8.8.8:80"
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type publicIP struct {
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ip net.IP
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}
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func (publicIP) MapPort(protocol string, intport, extport uint16, desc string, duration time.Duration) error {
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if intport != extport {
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return fmt.Errorf("cannot map port %d to %d", intport, extport)
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}
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return nil
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}
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func (publicIP) UnmapPort(protocol string, extport uint16) error {
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return nil
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}
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func (r publicIP) ExternalIP() (net.IP, error) {
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return r.ip, nil
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}
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func getOutboundIP() (net.IP, error) {
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conn, err := net.Dial("udp", googleDNSServer)
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if err != nil {
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return nil, err
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}
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defer conn.Close()
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return conn.LocalAddr().(*net.UDPAddr).IP, nil
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}
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func NewPublicIP() *publicIP {
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ip, err := getOutboundIP()
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if err != nil {
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return nil
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}
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return &publicIP{
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ip: ip,
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}
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}
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