mirror of https://github.com/status-im/op-geth.git
56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
package p2p
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import (
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"fmt"
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"net"
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"time"
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natpmp "github.com/jackpal/go-nat-pmp"
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)
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// Adapt the NAT-PMP protocol to the NAT interface
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// TODO:
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// + Register for changes to the external address.
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// + Re-register port mapping when router reboots.
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// + A mechanism for keeping a port mapping registered.
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// + Discover gateway address automatically.
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type natPMPClient struct {
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client *natpmp.Client
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}
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// PMP returns a NAT traverser that uses NAT-PMP. The provided gateway
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// address should be the IP of your router.
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func PMP(gateway net.IP) (nat NAT) {
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return &natPMPClient{natpmp.NewClient(gateway)}
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}
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func (*natPMPClient) String() string {
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return "NAT-PMP"
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}
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func (n *natPMPClient) GetExternalAddress() (net.IP, error) {
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response, err := n.client.GetExternalAddress()
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if err != nil {
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return nil, err
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}
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return response.ExternalIPAddress[:], nil
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}
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func (n *natPMPClient) AddPortMapping(protocol string, extport, intport int, name string, lifetime time.Duration) error {
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if lifetime <= 0 {
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return fmt.Errorf("lifetime must not be <= 0")
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}
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// Note order of port arguments is switched between our AddPortMapping and the client's AddPortMapping.
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_, err := n.client.AddPortMapping(protocol, intport, extport, int(lifetime/time.Second))
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return err
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}
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func (n *natPMPClient) DeletePortMapping(protocol string, externalPort, internalPort int) (err error) {
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// To destroy a mapping, send an add-port with
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// an internalPort of the internal port to destroy, an external port of zero and a time of zero.
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_, err = n.client.AddPortMapping(protocol, internalPort, 0, 0)
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return
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}
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