finds and reports OS nameservers

Signed-off-by: Jeff Carr <jcarr@wit.com>

linuxstatus/linuxloop.go

@@ -13,6 +13,7 @@ package linuxstatus
 import 	(
 	"os"
 	"os/user"
+	"io/ioutil"
 	"strconv"
 	"strings"
 	"sort"
@@ -66,6 +67,24 @@ func linuxLoop() {
 		me.uid.Set(tmp)
 	}
 
+	content, _ := ioutil.ReadFile("/etc/resolv.conf")
+	var ns []string
+	for _, line := range strings.Split(string(content), "\n") {
+		parts := strings.Split(line, " ")
+		if len(parts) > 1 {
+			if parts[0] == "nameserver" {
+				ns = append(ns, parts[1])
+			}
+		}
+	}
+	sort.Strings(ns)
+	newNS := strings.Join(ns, "\n")
+	if newNS != me.resolver.Get() {
+		log.Log(CHANGE, "resolver changed in /etc/resolv.conf to", ns)
+		me.changed = true
+		me.resolver.Set(newNS)
+	}
+
 	/*
 	processName := getProcessNameByPort(53)
 	fmt.Println("Process with port 53:", processName)

linuxstatus/net.go

@@ -282,3 +282,8 @@ func (ls *LinuxStatus) GetIPv4() []string {
 	return strings.Split(tmp, "\n")
 }
 
+func (ls *LinuxStatus) GetNameservers() []string {
+	if ! me.Ready() {return nil}
+	tmp := me.resolver.Get()
+	return strings.Split(tmp, "\n")
+}