mirror of https://github.com/k3s-io/k3s
58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
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package netutil
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import (
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"fmt"
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"net"
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"github.com/pkg/errors"
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"github.com/sirupsen/logrus"
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)
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func GetIPFromInterface(ifaceName string) string {
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ip, err := getIPFromInterface(ifaceName)
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if err != nil {
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logrus.Warn(errors.Wrap(err, "unable to get global unicast ip from interface name"))
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} else {
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logrus.Infof("found ip %s from iface %s", ip, ifaceName)
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}
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return ip
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}
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func getIPFromInterface(ifaceName string) (string, error) {
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iface, err := net.InterfaceByName(ifaceName)
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if err != nil {
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return "", err
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}
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addrs, err := iface.Addrs()
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if err != nil {
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return "", err
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}
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if iface.Flags&net.FlagUp == 0 {
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return "", fmt.Errorf("the interface %s is not up", ifaceName)
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}
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globalUnicasts := []string{}
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for _, addr := range addrs {
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ip, _, err := net.ParseCIDR(addr.String())
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if err != nil {
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return "", errors.Wrapf(err, "unable to parse CIDR for interface %s", iface.Name)
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}
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// skipping if not ipv4
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if ip.To4() == nil {
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continue
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}
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if ip.IsGlobalUnicast() {
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globalUnicasts = append(globalUnicasts, ip.String())
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}
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}
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if len(globalUnicasts) > 1 {
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return "", fmt.Errorf("multiple global unicast addresses defined for %s, please set ip from one of %v", ifaceName, globalUnicasts)
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}
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if len(globalUnicasts) == 1 {
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return globalUnicasts[0], nil
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}
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return "", fmt.Errorf("can't find ip for interface %s", ifaceName)
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}
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