starting a checkDNS() function

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

Makefile

@@ -1,18 +1,21 @@
 run: build
-	reset
 	./control-panel-dns
 
 verbose: build
-	reset
 	./control-panel-dns --verbose --verbose-net --gui-debug --toolkit-debug
 
 build-release:
+	reset
 	go get -v -u -x .
 	go build
 
 build:
+	reset
 	GO111MODULE="off" go get -v -x .
-	GO111MODULE="off" go build
+	GO111MODULE="off" go build -v
+
+test:
+	GO111MODULE="off" go test -v
 
 update:
 	GO111MODULE="off" go get -v -u -x .

gui.go

@@ -66,6 +66,22 @@ func addDNSTab(window *gui.Node, title string) {
 	g2.NewButton("scanInterfaces()", func () {
 		scanInterfaces()
 	})
+	g2.NewButton("dump Host.ifmap", func () {
+		for i, t := range me.ifmap {
+			log("int =", i, "name =", t.name, t.iface)
+		}
+	})
+	g2.NewButton("dump Host.ipmap", func () {
+		for s, t := range me.ipmap {
+			log("name =", s, "ipv4 =", t.ipv4)
+			log("name =", s, "ipv6 =", t.ipv6)
+			log("name =", s, "iface =", t.iface)
+			log("name =", s, "ip =", t.ip)
+		}
+	})
+	g2.NewButton("checkDNS()", func () {
+		checkDNS()
+	})
 	g2.NewButton("os.Hostname()", func () {
 		name, err = os.Hostname()
 		log("name =", name, err)

main.go

@@ -3,7 +3,7 @@ package main
 
 import 	(
 	"runtime"
-	"net"
+	// "net"
 	"git.wit.org/wit/gui"
 	arg "github.com/alexflint/go-arg"
 )
@@ -12,8 +12,8 @@ func main() {
 	arg.MustParse(&args)
 
 	// initialize the maps to track IP addresses and network interfaces
-	me.ip = make(map[string]*IPtype)
-	me.ifmap = make(map[int]*net.Interface)
+	me.ipmap = make(map[string]*IPtype)
+	me.ifmap = make(map[int]*IFtype)
 
 	go checkNetworkChanges()
 
@@ -26,6 +26,9 @@ func main() {
 	sleep("done scanning net")
 	// exit("done scanning net")
 
+	// Example_listLink()
+	// exit()
+
 	log("Toolkit = ", args.Toolkit)
 	// gui.InitPlugins([]string{"andlabs"})
 	gui.Main(initGUI)

net.go

@@ -42,6 +42,16 @@ func IsIPv6(address string) bool {
 	return strings.Count(address, ":") >= 2
 }
 
+func (t *IPtype) IsReal() bool {
+	if (t.ip.IsPrivate() || t.ip.IsLoopback() || t.ip.IsLinkLocalUnicast()) {
+		log(DEBUGNET, "\t\tIP is Real = false")
+		return false
+	} else {
+		log(DEBUGNET, "\t\tIP is Real = true")
+		return true
+	}
+}
+
 func IsReal(ip *net.IP) bool {
 	if (ip.IsPrivate() || ip.IsLoopback() || ip.IsLinkLocalUnicast()) {
 		log(DEBUGNET, "\t\tIP is Real = false")
@@ -52,45 +62,78 @@ func IsReal(ip *net.IP) bool {
 	}
 }
 
-func checkInterface(i *net.Interface) {
+func renameInterface(i *net.Interface) {
+	/*
+	/sbin/ip link set eth1 down
+	/sbin/ip link set eth1 name eth123
+	/sbin/ip link set eth123 up
+	*/
+}
+
+// Will figure out if an interface was just added
+func checkInterface(i net.Interface) {
 	val, ok := me.ifmap[i.Index]
 	if ! ok {
 		log(i.Name, "is a new network interface. The linux kernel index =", i.Index)
-		me.ifmap[i.Index] = i
+		me.ifmap[i.Index] = new(IFtype)
+		me.ifmap[i.Index].gone = false
+		me.ifmap[i.Index].iface = &i
 		me.ipchange = true
 		return
 	}
-	log(args.VerboseNet, "me.ifmap[i] does exist. Need to compare everything.", me.ifmap[i.Index].Name)
-	if (me.ifmap[i.Index].Name != val.Name) {
-		log(val.Name, "has changed to it's name to", i.Name)
-		me.ifmap[i.Index] = i
+	me.ifmap[i.Index].gone = false
+	log(args.VerboseNet, "me.ifmap[i] does exist. Need to compare everything.", i.Index, i.Name, val.iface.Index, val.iface.Name)
+	if (val.iface.Name != i.Name) {
+		log(val.iface.Name, "has changed to it's name to", i.Name)
+		me.ifmap[i.Index].iface = &i
 		me.ipchange = true
 		return
 	}
 }
 
-func isNewIPNet(ip *net.IPNet, i *net.Interface) bool {
+func checkDNS() {
+	for s, t := range me.ipmap {
+		i := t.iface
+		ipt := "IPv4"
+		if (t.ipv6) {
+			ipt = "IPv6"
+		}
+		if (t.IsReal()) {
+			log("\tIP is Real    ", ipt, i.Index, i.Name, s)
+		} else {
+			log("\tIP is not Real", ipt, i.Index, i.Name, s)
+		}
+	}
+}
+
+// Will figure out if an IP address is new
+func checkIP(ip *net.IPNet, i net.Interface) bool {
 	log(args.VerboseNet, "\t\taddr.(type) = *net.IPNet")
 	log(args.VerboseNet, "\t\taddr.(type) =", ip)
 	var realip string
 	realip = ip.IP.String()
 
-	val, ok := me.ip[realip]
+	val, ok := me.ipmap[realip]
 	if ok {
-		log(args.VerboseNet, val.IPNet.IP, "is already a defined IP address")
+		log(args.VerboseNet, val.ipnet.IP.String(), "is already a defined IP address")
+		me.ipmap[realip].gone = false
 		return false
 	}
 
-	me.ip[realip] = new(IPtype)
-	me.ip[realip].IPNet = ip
+	me.ipmap[realip] = new(IPtype)
+	me.ipmap[realip].gone = false
+	me.ipmap[realip].ipv4 = true
+	me.ipmap[realip].ipnet = ip
+	me.ipmap[realip].ip = ip.IP
+	me.ipmap[realip].iface = &i
 	t := "IPv4"
 	if (IsIPv6(ip.String())) {
-		me.ip[realip].IPv6 = true
-		me.ip[realip].IPv4 = false
+		me.ipmap[realip].ipv6 = true
+		me.ipmap[realip].ipv4 = false
 		t = "IPv6"
 	} else {
-		me.ip[realip].IPv6 = false
-		me.ip[realip].IPv4 = true
+		me.ipmap[realip].ipv6 = false
+		me.ipmap[realip].ipv4 = true
 	}
 	if (IsReal(&ip.IP)) {
 		log("\tIP is Real    ", t, i.Index, i.Name, realip)
@@ -100,6 +143,7 @@ func isNewIPNet(ip *net.IPNet, i *net.Interface) bool {
 	log(args.VerboseNet, "\t\tIP is IsPrivate() =", ip.IP.IsPrivate())
 	log(args.VerboseNet, "\t\tIP is IsLoopback() =", ip.IP.IsLoopback())
 	log(args.VerboseNet, "\t\tIP is IsLinkLocalUnicast() =", ip.IP.IsLinkLocalUnicast())
+	// log("HERE HERE", "realip =", realip, "me.ip[realip]=", me.ipmap[realip])
 	return true
 }
 
@@ -111,7 +155,7 @@ func scanInterfaces() {
 	for _, i := range ifaces {
 		addrs, _ := i.Addrs()
 		// log("range ifaces = ", i)
-		checkInterface(&i)
+		checkInterface(i)
 		log(args.VerboseNet, "*net.Interface.Name = ", i.Name, i.Index)
 		log(args.VerboseNet, SPEW, i)
 		log(DEBUGNET, SPEW, addrs)
@@ -122,11 +166,33 @@ func scanInterfaces() {
 			log(DEBUGNET, "\tLookupIP(addr) =", ips)
 			switch v := addr.(type) {
 			case *net.IPNet:
-				isNewIPNet(v, &i)
+				checkIP(v, i)
 				// log("\t\tIP is () =", ip.())
 			default:
 				log(DEBUGNET, "\t\taddr.(type) = NO IDEA WHAT TO DO HERE v =", v)
 			}
 		}
 	}
+	deleteChanges()
+}
+
+// delete network interfaces and ip addresses from the gui
+func deleteChanges() {
+	for i, t := range me.ifmap {
+		if (t.gone) {
+			log("DELETE int =", i, "name =", t.name, t.iface)
+			delete(me.ifmap, i)
+		}
+		t.gone = true
+	}
+	for s, t := range me.ipmap {
+		if (t.gone) {
+			log("DELETE name =", s, "IPv4 =", t.ipv4)
+			log("DELETE name =", s, "IPv6 =", t.ipv6)
+			log("DELETE name =", s, "iface =", t.iface)
+			log("DELETE name =", s, "ip =", t.ip)
+			delete(me.ipmap, s)
+		}
+		t.gone = true
+	}
 }

rtnetlink.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"github.com/jsimonetti/rtnetlink"
+)
+
+// List all interfaces
+func Example_listLink() {
+	// Dial a connection to the rtnetlink socket
+	conn, err := rtnetlink.Dial(nil)
+	if err != nil {
+		exit(err)
+	}
+	defer conn.Close()
+
+	// Request a list of interfaces
+	msg, err := conn.Link.List()
+	if err != nil {
+		log(err)
+	}
+
+	log("%#v", msg)
+	log(SPEW, msg)
+}

structs.go

@@ -12,17 +12,24 @@ type Host struct {
 	hostname	string			// mirrors
 	domainname	string			// kernel.org
 	fqdn		string			// mirrors.kernel.org
-	ip		map[string]*IPtype
-	ifmap		map[int]*net.Interface	// the current network settings
-	// ifnew		[]net.Interface		// used to look for changes
+	ipmap		map[string]*IPtype	// the current ip addresses
+	ifmap		map[int]*IFtype		// the current interfaces
 	ipchange	bool			// set to true if things change
 }
 
 type IPtype struct {
-	// IP		string
-	IPv4		bool
-	IPv6		bool
+	gone		bool		// used to track if the ip exists
+	ipv6		bool		// the future
+	ipv4		bool		// the past
 	LinkLocal	bool
-	Interface	*net.Interface
-	IPNet		*net.IPNet
+	iface		*net.Interface
+	ip		net.IP
+	ipnet		*net.IPNet
+}
+
+type IFtype struct {
+	gone		bool		// used to track if the interface exists
+	name		string		// just a shortcut to the name. maybe this is dumb
+	// up		bool		// could be used to track ifup/ifdown
+	iface		*net.Interface
 }