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377e770db4
In this commit, we introduce a new package `nat`. This package is responsible for handling the different techniques for NAT traversals. Specifically, we have implemented UPnP and NAT-PMP support. This will allow users to easily advertise their nodes to the network as long as their devices are behind a single NAT. Devices behind multiple NATs are not supported.
59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
package nat
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import (
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"errors"
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"net"
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)
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var (
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// private24BitBlock contains the set of private IPv4 addresses within
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// the 10.0.0.0/8 adddress space.
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private24BitBlock *net.IPNet
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// private20BitBlock contains the set of private IPv4 addresses within
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// the 172.16.0.0/12 address space.
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private20BitBlock *net.IPNet
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// private16BitBlock contains the set of private IPv4 addresses within
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// the 192.168.0.0/16 address space.
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private16BitBlock *net.IPNet
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// ErrMultipleNAT is an error returned when multiple NATs have been
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// detected.
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ErrMultipleNAT = errors.New("multiple NATs detected")
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)
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func init() {
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_, private24BitBlock, _ = net.ParseCIDR("10.0.0.0/8")
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_, private20BitBlock, _ = net.ParseCIDR("172.16.0.0/12")
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_, private16BitBlock, _ = net.ParseCIDR("192.168.0.0/16")
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}
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// Traversal is an interface that brings together the different NAT traversal
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// techniques.
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type Traversal interface {
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// ExternalIP returns the external IP address.
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ExternalIP() (net.IP, error)
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// AddPortMapping adds a port mapping for the given port between the
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// private and public addresses.
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AddPortMapping(port uint16) error
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// DeletePortMapping deletes a port mapping for the given port between
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// the private and public addresses.
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DeletePortMapping(port uint16) error
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// ForwardedPorts returns the ports currently being forwarded using NAT
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// traversal.
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ForwardedPorts() []uint16
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// Name returns the name of the specific NAT traversal technique used.
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Name() string
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}
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// isPrivateIP determines if the IP is private.
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func isPrivateIP(ip net.IP) bool {
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return private24BitBlock.Contains(ip) ||
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private20BitBlock.Contains(ip) || private16BitBlock.Contains(ip)
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}
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