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loki/pkg/util/net.go

61 lines
1.6 KiB

package util
import (
"fmt"
"net"
"strings"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
)
// GetFirstAddressOf returns the first IPv4 address of the supplied interface names, omitting any 169.254.x.x automatic private IPs if possible.
func GetFirstAddressOf(names []string, logger log.Logger) (string, error) {
var ipAddr string
for _, name := range names {
inf, err := net.InterfaceByName(name)
if err != nil {
level.Warn(logger).Log("msg", "error getting interface", "inf", name, "err", err)
continue
}
addrs, err := inf.Addrs()
if err != nil {
level.Warn(logger).Log("msg", "error getting addresses for interface", "inf", name, "err", err)
continue
}
if len(addrs) <= 0 {
level.Warn(logger).Log("msg", "no addresses found for interface", "inf", name, "err", err)
continue
}
if ip := filterIPs(addrs); ip != "" {
ipAddr = ip
}
if strings.HasPrefix(ipAddr, `169.254.`) || ipAddr == "" {
continue
}
return ipAddr, nil
}
if ipAddr == "" {
return "", fmt.Errorf("no address found for %s", names)
}
if strings.HasPrefix(ipAddr, `169.254.`) {
level.Warn(logger).Log("msg", "using automatic private ip", "address", ipAddr)
}
return ipAddr, nil
}
// filterIPs attempts to return the first non automatic private IP (APIPA / 169.254.x.x) if possible, only returning APIPA if available and no other valid IP is found.
func filterIPs(addrs []net.Addr) string {
var ipAddr string
for _, addr := range addrs {
if v, ok := addr.(*net.IPNet); ok {
if ip := v.IP.To4(); ip != nil {
ipAddr = v.IP.String()
if !strings.HasPrefix(ipAddr, `169.254.`) {
return ipAddr
}
}
}
}
return ipAddr
}