137 lines
2.3 KiB
Go
137 lines
2.3 KiB
Go
package addr
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import (
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"fmt"
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"net"
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)
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var (
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privateBlocks []*net.IPNet
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)
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func init() {
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for _, b := range []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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if _, block, err := net.ParseCIDR(b); err == nil {
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privateBlocks = append(privateBlocks, block)
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}
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}
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}
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func isPrivateIP(ipAddr string) bool {
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ip := net.ParseIP(ipAddr)
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for _, priv := range privateBlocks {
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if priv.Contains(ip) {
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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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// Extract returns a real ip
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func Extract(addr string) (string, error) {
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// if addr specified then its returned
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if len(addr) > 0 && (addr != "0.0.0.0" && addr != "[::]" && addr != "::") {
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return addr, 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 "", fmt.Errorf("Failed to get interfaces! Err: %v", err)
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}
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//nolint:prealloc
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var addrs []net.Addr
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var loAddrs []net.Addr
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for _, iface := range ifaces {
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ifaceAddrs, err := iface.Addrs()
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if err != nil {
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// ignore error, interface can dissapear from system
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continue
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}
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if iface.Flags&net.FlagLoopback != 0 {
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loAddrs = append(loAddrs, ifaceAddrs...)
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continue
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}
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addrs = append(addrs, ifaceAddrs...)
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}
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addrs = append(addrs, loAddrs...)
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var ipAddr []byte
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var publicIP []byte
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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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publicIP = ip
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continue
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}
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ipAddr = ip
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break
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}
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// return private ip
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if ipAddr != nil {
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return net.IP(ipAddr).String(), nil
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}
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// return public or virtual ip
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if publicIP != nil {
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return net.IP(publicIP).String(), nil
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}
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return "", fmt.Errorf("No IP address found, and explicit IP not provided")
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}
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// IPs returns all known ips
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func IPs() []string {
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ifaces, err := net.Interfaces()
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if err != nil {
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return nil
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}
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var ipAddrs []string
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for _, i := range ifaces {
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addrs, err := i.Addrs()
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if err != nil {
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continue
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}
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for _, addr := range addrs {
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var ip net.IP
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switch v := addr.(type) {
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case *net.IPNet:
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ip = v.IP
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case *net.IPAddr:
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ip = v.IP
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}
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if ip == nil {
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continue
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}
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// dont skip ipv6 addrs
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/*
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ip = ip.To4()
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if ip == nil {
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continue
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}
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*/
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ipAddrs = append(ipAddrs, ip.String())
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}
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}
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return ipAddrs
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}
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