47 lines
1.4 KiB
Go
47 lines
1.4 KiB
Go
package sysutil
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import (
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"net"
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"os/exec"
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"strings"
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"github.com/AdguardTeam/AdGuardHome/internal/agherr"
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"github.com/AdguardTeam/golibs/log"
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)
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// ErrNoStaticIPInfo is returned by IfaceHasStaticIP when no information about
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// the IP being static is available.
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const ErrNoStaticIPInfo agherr.Error = "no information about static ip"
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// IfaceHasStaticIP checks if interface is configured to have static IP address.
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// If it can't give a definitive answer, it returns false and an error for which
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// errors.Is(err, ErrNoStaticIPInfo) is true.
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func IfaceHasStaticIP(ifaceName string) (has bool, err error) {
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return ifaceHasStaticIP(ifaceName)
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}
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// IfaceSetStaticIP sets static IP address for network interface.
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func IfaceSetStaticIP(ifaceName string) (err error) {
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return ifaceSetStaticIP(ifaceName)
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}
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// GatewayIP returns IP address of interface's gateway.
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func GatewayIP(ifaceName string) net.IP {
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cmd := exec.Command("ip", "route", "show", "dev", ifaceName)
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log.Tracef("executing %s %v", cmd.Path, cmd.Args)
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d, err := cmd.Output()
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if err != nil || cmd.ProcessState.ExitCode() != 0 {
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return nil
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}
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fields := strings.Fields(string(d))
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// The meaningful "ip route" command output should contain the word
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// "default" at first field and default gateway IP address at third
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// field.
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if len(fields) < 3 || fields[0] != "default" {
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return nil
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}
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return net.ParseIP(fields[2])
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}
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