poll every 2 seconds

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

Makefile

@@ -2,6 +2,10 @@ run: build
 	reset
 	./control-panel-dns
 
+verbose: build
+	reset
+	./control-panel-dns --verbose --verbose-net --gui-debug --toolkit-debug
+
 build-release:
 	go get -v -u -x .
 	go build

README.md

@@ -9,6 +9,13 @@ Goals:
 * Run as a daemon
 * When run in GUI, add status via systray
 
+# Rational
+
+With the advent of IPv6, it is finally possible again to have real hostnames for
+your machines, desktops, laptops, vm's, etc. This control panel will poll for
+changes, find out what the DNS entries are, then, if they are not correct, attempt
+to update the DNS server.
+
 ## References
 
 Useful links and other

dynamic-dns-update.go

@@ -0,0 +1,32 @@
+package main
+
+/* 
+	https://pkg.go.dev/github.com/miekg/dns#section-readme
+
+DYNAMIC UPDATES
+
+Dynamic updates reuses the DNS message format, but renames three of the sections. Question is Zone, Answer is Prerequisite, Authority is Update, only the Additional is not renamed. See RFC 2136 for the gory details.
+
+You can set a rather complex set of rules for the existence of absence of certain resource records or names in a zone to specify if resource records should be added or removed. The table from RFC 2136 supplemented with the Go DNS function shows which functions exist to specify the prerequisites.
+
+3.2.4 - Table Of Metavalues Used In Prerequisite Section
+
+ CLASS    TYPE     RDATA    Meaning                    Function
+ --------------------------------------------------------------
+ ANY      ANY      empty    Name is in use             dns.NameUsed
+ ANY      rrset    empty    RRset exists (value indep) dns.RRsetUsed
+ NONE     ANY      empty    Name is not in use         dns.NameNotUsed
+ NONE     rrset    empty    RRset does not exist       dns.RRsetNotUsed
+ zone     rrset    rr       RRset exists (value dep)   dns.Used
+
+The prerequisite section can also be left empty. If you have decided on the prerequisites you can tell what RRs should be added or deleted. The next table shows the options you have and what functions to call.
+
+3.4.2.6 - Table Of Metavalues Used In Update Section
+
+ CLASS    TYPE     RDATA    Meaning                     Function
+ ---------------------------------------------------------------
+ ANY      ANY      empty    Delete all RRsets from name dns.RemoveName
+ ANY      rrset    empty    Delete an RRset             dns.RemoveRRset
+ NONE     rrset    rr       Delete an RR from RRset     dns.Remove
+ zone     rrset    rr       Add to an RRset             dns.Insert
+*/

main.go

@@ -18,13 +18,7 @@ func main() {
 
 	// gui.InitPlugins([]string{"andlabs"})
 
-
-	if (runtime.GOOS == "linux") {
-		scanInterfaces()
-	} else {
-		log("Windows and MacOS don't work yet")
-		exit()
-	}
+	go checkNetworkChanges()
 
 	log()
 	log(true, "this is true")
@@ -35,6 +29,20 @@ func main() {
 	sleep("done scanning net")
 	// exit("done scanning net")
 
-	watchNetworkInterfaces()
+	// watchNetworkInterfaces()
 	gui.Main(initGUI)
 }
+
+/*
+	Poll for changes to the networking settings
+*/
+func checkNetworkChanges() {
+	for {
+		sleep(2)
+		if (runtime.GOOS == "linux") {
+			scanInterfaces()
+		} else {
+			log("Windows and MacOS don't work yet")
+		}
+	}
+}

net.go

@@ -10,6 +10,7 @@ import 	(
 var DEBUGNET bool = false
 
 // this doesn't work
+/*
 func watchNetworkInterfaces() {
 	// Get list of network interfaces
 	interfaces, _ := net.Interfaces()
@@ -35,6 +36,7 @@ func watchNetworkInterfaces() {
 		}
 	}()
 }
+*/
 
 func IsIPv6(address string) bool {
 	return strings.Count(address, ":") >= 2