95 lines
2.2 KiB
Go
95 lines
2.2 KiB
Go
package autonat
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import (
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"net"
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"github.com/libp2p/go-libp2p-core/host"
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ma "github.com/multiformats/go-multiaddr"
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manet "github.com/multiformats/go-multiaddr/net"
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)
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type dialPolicy struct {
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allowSelfDials bool
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host host.Host
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}
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// skipDial indicates that a multiaddress isn't worth attempted dialing.
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// The same logic is used when the autonat client is considering if
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// a remote peer is worth using as a server, and when the server is
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// considering if a requested client is worth dialing back.
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func (d *dialPolicy) skipDial(addr ma.Multiaddr) bool {
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// skip relay addresses
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_, err := addr.ValueForProtocol(ma.P_CIRCUIT)
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if err == nil {
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return true
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}
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if d.allowSelfDials {
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return false
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}
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// skip private network (unroutable) addresses
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if !manet.IsPublicAddr(addr) {
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return true
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}
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candidateIP, err := manet.ToIP(addr)
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if err != nil {
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return true
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}
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// Skip dialing addresses we believe are the local node's
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for _, localAddr := range d.host.Addrs() {
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localIP, err := manet.ToIP(localAddr)
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if err != nil {
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continue
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}
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if localIP.Equal(candidateIP) {
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return true
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}
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}
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return false
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}
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// skipPeer indicates that the collection of multiaddresses representing a peer
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// isn't worth attempted dialing. If one of the addresses matches an address
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// we believe is ours, we exclude the peer, even if there are other valid
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// public addresses in the list.
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func (d *dialPolicy) skipPeer(addrs []ma.Multiaddr) bool {
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localAddrs := d.host.Addrs()
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localHosts := make([]net.IP, 0)
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for _, lAddr := range localAddrs {
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if _, err := lAddr.ValueForProtocol(ma.P_CIRCUIT); err != nil && manet.IsPublicAddr(lAddr) {
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lIP, err := manet.ToIP(lAddr)
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if err != nil {
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continue
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}
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localHosts = append(localHosts, lIP)
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}
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}
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// if a public IP of the peer is one of ours: skip the peer.
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goodPublic := false
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for _, addr := range addrs {
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if _, err := addr.ValueForProtocol(ma.P_CIRCUIT); err != nil && manet.IsPublicAddr(addr) {
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aIP, err := manet.ToIP(addr)
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if err != nil {
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continue
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}
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for _, lIP := range localHosts {
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if lIP.Equal(aIP) {
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return true
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}
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}
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goodPublic = true
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}
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}
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if d.allowSelfDials {
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return false
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}
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return !goodPublic
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}
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