use saved static nameservers stored for the default router interface when doing nameserver discovery

fix bad logger usages

patch darwin interface name

patch darwin interface name, debugging

make resetDNS check for static config on startup, optionally restoring static confiration as needed

fix netmon logging

cmd/cli/cli.go

@@ -418,7 +418,8 @@ func run(appCallback *AppCallback, stopCh chan struct{}) {
 				if err := p.router.Cleanup(); err != nil {
 					mainLog.Load().Error().Err(err).Msg("could not cleanup router")
 				}
-				p.resetDNS()
+				// restore static DNS settings or DHCP
+				p.resetDNS(false, true)
 			})
 		}
 	}
@@ -1030,7 +1031,8 @@ func uninstall(p *prog, s service.Service) {
 			mainLog.Load().Warn().Err(err).Msg("post uninstallation failed, please check system/service log for details error")
 			return
 		}
-		p.resetDNS()
+		// restore static DNS settings or DHCP
+		p.resetDNS(false, true)
 
 		// if present restore the original DNS settings
 		if netIface, err := netInterface(p.runningIface); err == nil {
@@ -1779,12 +1781,14 @@ func resetDnsNoLog(p *prog) {
 	if verbose < 3 {
 		lvl := zerolog.GlobalLevel()
 		zerolog.SetGlobalLevel(zerolog.Disabled)
-		p.resetDNS()
+		// This is startup so interface settings may have changed
+		p.resetDNS(true, true)
 		zerolog.SetGlobalLevel(lvl)
 		return
 	}
 	// For debugging purpose, still emit log.
-	p.resetDNS()
+	// This is startup so interface settings may have changed
+	p.resetDNS(true, true)
 }
 
 // resetDnsTask returns a task which perform reset DNS operation.
@@ -1806,10 +1810,10 @@ func resetDnsTask(p *prog, s service.Service, isCtrldInstalled bool, ir *ifaceRe
 		}
 		p.runningIface = iface
 		if isCtrldInstalled {
-			mainLog.Load().Debug().Msg("restore system DNS settings")
 			if status, _ := s.Status(); status == service.StatusRunning {
 				mainLog.Load().Fatal().Msg("reset DNS while ctrld still running is not safe")
 			}
+			mainLog.Load().Debug().Msg("Start resetDNS")
 			resetDnsNoLog(p)
 		}
 		iface = oldIface
@@ -1868,8 +1872,8 @@ func uninstallInvalidCdUID(p *prog, logger zerolog.Logger, doStop bool) bool {
 		logger.Warn().Err(err).Msg("failed to create new service")
 		return false
 	}
-
-	p.resetDNS()
+	// restore static DNS settings or DHCP
+	p.resetDNS(false, true)
 
 	tasks := []task{{s.Uninstall, true, "Uninstall"}}
 	if doTasks(tasks) {