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2 years ago
package host
import (
"fmt"
"net"
"strconv"
)
// ExtractHostPort from address
func ExtractHostPort(addr string) (host string, port uint64, err error) {
var ports string
host, ports, err = net.SplitHostPort(addr)
if err != nil {
return
}
port, err = strconv.ParseUint(ports, 10, 16) //nolint:gomnd
return
}
func isValidIP(addr string) bool {
ip := net.ParseIP(addr)
return ip.IsGlobalUnicast() && !ip.IsInterfaceLocalMulticast()
}
// Port return a real port.
func Port(lis net.Listener) (int, bool) {
if addr, ok := lis.Addr().(*net.TCPAddr); ok {
return addr.Port, true
}
return 0, false
}
// Extract returns a private addr and port.
func Extract(hostPort string, lis net.Listener) (string, error) {
addr, port, err := net.SplitHostPort(hostPort)
if err != nil && lis == nil {
return "", err
}
if lis != nil {
p, ok := Port(lis)
if !ok {
return "", fmt.Errorf("failed to extract port: %v", lis.Addr())
}
port = strconv.Itoa(p)
}
if len(addr) > 0 && (addr != "0.0.0.0" && addr != "[::]" && addr != "::") {
return net.JoinHostPort(addr, port), nil
}
ifaces, err := net.Interfaces()
if err != nil {
return "", err
}
minIndex := int(^uint(0) >> 1)
ips := make([]net.IP, 0)
for _, iface := range ifaces {
if (iface.Flags & net.FlagUp) == 0 {
continue
}
if iface.Index >= minIndex && len(ips) != 0 {
continue
}
addrs, err := iface.Addrs()
if err != nil {
continue
}
for i, rawAddr := range addrs {
var ip net.IP
switch addr := rawAddr.(type) {
case *net.IPAddr:
ip = addr.IP
case *net.IPNet:
ip = addr.IP
default:
continue
}
if isValidIP(ip.String()) {
minIndex = iface.Index
if i == 0 {
ips = make([]net.IP, 0, 1)
}
ips = append(ips, ip)
if ip.To4() != nil {
break
}
}
}
}
if len(ips) != 0 {
return net.JoinHostPort(ips[len(ips)-1].String(), port), nil
}
return "", nil
}