Maint: split Go files in dns package

internal/dns/plaintext.go

@@ -0,0 +1,36 @@
+package dns
+
+import "github.com/qdm12/dns/pkg/nameserver"
+
+func (l *looper) useUnencryptedDNS(fallback bool) {
+	settings := l.GetSettings()
+
+	// Try with user provided plaintext ip address
+	targetIP := settings.PlaintextAddress
+	if targetIP != nil {
+		if fallback {
+			l.logger.Info("falling back on plaintext DNS at address " + targetIP.String())
+		} else {
+			l.logger.Info("using plaintext DNS at address " + targetIP.String())
+		}
+		nameserver.UseDNSInternally(targetIP)
+		err := nameserver.UseDNSSystemWide(l.resolvConf, targetIP, settings.KeepNameserver)
+		if err != nil {
+			l.logger.Error(err.Error())
+		}
+		return
+	}
+
+	provider := settings.Unbound.Providers[0]
+	targetIP = provider.DoT().IPv4[0]
+	if fallback {
+		l.logger.Info("falling back on plaintext DNS at address " + targetIP.String())
+	} else {
+		l.logger.Info("using plaintext DNS at address " + targetIP.String())
+	}
+	nameserver.UseDNSInternally(targetIP)
+	err := nameserver.UseDNSSystemWide(l.resolvConf, targetIP, settings.KeepNameserver)
+	if err != nil {
+		l.logger.Error(err.Error())
+	}
+}