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2019-08-05 10:50:12 -07:00

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package security
import (
"os/exec"
"runtime"
"strings"
"github.com/wtfutil/wtf/utils"
)
/* -------------------- Exported Functions -------------------- */
func DnsServers() []string {
switch runtime.GOOS {
case "linux":
return dnsLinux()
case "darwin":
return dnsMacOS()
case "windows":
return dnsWindows()
default:
return []string{runtime.GOOS}
}
}
/* -------------------- Unexported Functions -------------------- */
func dnsLinux() []string {
// This may be very Ubuntu specific
cmd := exec.Command("nmcli", "device", "show")
out := utils.ExecuteCommand(cmd)
lines := strings.Split(out, "\n")
dns := []string{}
for _, l := range lines {
if strings.HasPrefix(l, "IP4.DNS") {
parts := strings.Split(l, ":")
dns = append(dns, strings.TrimSpace(parts[1]))
}
}
return dns
}
func dnsMacOS() []string {
cmdString := `scutil --dns | head -n 7 | grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}'`
cmd := exec.Command("sh", "-c", cmdString)
out := utils.ExecuteCommand(cmd)
lines := strings.Split(out, "\n")
if len(lines) > 0 {
return lines
}
return []string{}
}
func dnsWindows() []string {
cmd := exec.Command("powershell.exe", "-NoProfile", "Get-DnsClientServerAddress | Select-Object ExpandProperty ServerAddresses")
return []string{utils.ExecuteCommand(cmd)}
}