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71 lines
1.4 KiB
71 lines
1.4 KiB
package host
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import (
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"net"
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"strconv"
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)
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var (
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privateAddrs = []string{"10.0.0.0/8", "172.16.0.0/12", "192.168.0.0/16", "100.64.0.0/10", "fd00::/8"}
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)
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func isPrivateIP(addr string) bool {
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ipAddr := net.ParseIP(addr)
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for _, privateAddr := range privateAddrs {
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if _, priv, err := net.ParseCIDR(privateAddr); err == nil {
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if priv.Contains(ipAddr) {
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return true
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}
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}
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}
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return false
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}
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// Port return a real port.
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func Port(lis net.Listener) (int, bool) {
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if addr, ok := lis.Addr().(*net.TCPAddr); ok {
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return addr.Port, true
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}
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return 0, false
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}
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// Extract returns a private addr and port.
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func Extract(hostport string, lis net.Listener) (string, error) {
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addr, port, err := net.SplitHostPort(hostport)
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if err != nil {
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return "", err
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}
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if lis != nil {
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if p, ok := Port(lis); ok {
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port = strconv.Itoa(p)
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}
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}
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if len(addr) > 0 && (addr != "0.0.0.0" && addr != "[::]" && addr != "::") {
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return net.JoinHostPort(addr, port), nil
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}
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ifaces, err := net.Interfaces()
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if err != nil {
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return "", err
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}
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for _, iface := range ifaces {
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addrs, err := iface.Addrs()
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if err != nil {
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continue
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}
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for _, rawAddr := range addrs {
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var ip net.IP
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switch addr := rawAddr.(type) {
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case *net.IPAddr:
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ip = addr.IP
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case *net.IPNet:
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ip = addr.IP
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default:
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continue
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}
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if isPrivateIP(ip.String()) {
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return net.JoinHostPort(ip.String(), port), nil
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}
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}
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}
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return "", nil
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}
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