Add support for UXG series of Unifi product (#899)

Fixes #889

host/service/ubios/service.go

@@ -12,6 +12,7 @@ package ubios
 import (
 	"bufio"
 	"os"
+	"os/exec"
 	"strings"
 
 	"github.com/nextdns/nextdns/host/service"
@@ -23,8 +24,18 @@ type Service struct {
 	systemd.Service
 }
 
+func isUnifi() bool {
+	if st, _ := os.Stat("/data/unifi"); st != nil && st.IsDir() {
+		return true
+	}
+	if err := exec.Command("ubnt-device-info", "firmware").Run(); err == nil {
+		return true
+	}
+	return false
+}
+
 func New(c service.Config) (Service, error) {
-	if st, _ := os.Stat("/data/unifi"); st == nil || !st.IsDir() {
+	if !isUnifi() {
 		return Service{}, service.ErrNotSupported
 	}
 	srv := Service{

install.sh

@@ -101,13 +101,13 @@ uninstall() {
 precheck() {
     if [ -e "/data/unifi" ] && [ -f "/run/dnsfilter/dnsfilter" ]; then
         log_warn "UDM Content Filtering and/or Ad Blocking feature is enabled."
-	log_warn "Please disable it to use NextDNS."
+        log_warn "Please disable it to use NextDNS."
         log_warn ""
         log_warn "  To disable Content Filtering, go to Settings > Network."
         log_warn "  For each network, set the Content Filtering feature to None."
-	log_warn ""
-	log_warn "  To disable Ad Blocking, go to Settings > Application Firewall"
-	log_warn "  In the General tab, uncheck the Ad Blocking checkbox."
+        log_warn ""
+        log_warn "  To disable Ad Blocking, go to Settings > Application Firewall"
+        log_warn "  In the General tab, uncheck the Ad Blocking checkbox."
         log_warn ""
         while [ -f "/run/dnsfilter/dnsfilter" ]; do
             sleep 1
@@ -1038,9 +1038,9 @@ bin_location() {
         ;;
     synology)
         echo "/usr/local/bin/nextdns"
-	;;
+    ;;
     darwin)
-	echo "$(brew --prefix 2>/dev/null || echo /usr/local)/bin/nextdns"
+        echo "$(brew --prefix 2>/dev/null || echo /usr/local)/bin/nextdns"
         ;;
     asuswrt-merlin|ddwrt)
         echo "/jffs/nextdns/nextdns"

router/ubios/setup.go

@@ -17,8 +17,18 @@ type Router struct {
 	ClientReporting bool
 }
 
+func isUnifi() bool {
+	if st, _ := os.Stat("/data/unifi"); st != nil && st.IsDir() {
+		return true
+	}
+	if err := exec.Command("ubnt-device-info", "firmware").Run(); err == nil {
+		return true
+	}
+	return false
+}
+
 func New() (*Router, bool) {
-	if st, _ := os.Stat("/data/unifi"); st == nil || !st.IsDir() {
+	if !isUnifi() {
 		return nil, false
 	}
 	return &Router{