Optimize configuration, and add blacklist ip features

etc/smartdns/smartdns.conf

@@ -4,6 +4,10 @@
 #   server-name smartdns
 #
 
+# Include another configuration options
+# conf-file [file]
+# conf-file blacklist-ip.conf
+
 # dns server bind ip and port, default dns server port is 53.
 # bind [IP]:port, udp server
 # bind-tcp [IP]:port, tcp server
@@ -27,7 +31,10 @@ cache-size 512
 # prefetch-domain yes
 
 # List of hosts that supply bogus NX domain results 
-# bogus-nxdomain [ip]
+# bogus-nxdomain [ip/subnet]
+
+# List of IPs that will be filtered when nameserver is configured -blacklist-ip parameter
+# blacklist-ip [ip/subnet]
 
 # force AAAA query return SO
 # force-AAAA-SOA [yes|no]
@@ -46,7 +53,7 @@ cache-size 512
 # log-file: file path of log file.
 # log-size: size of each log file, support k,m,g
 # log-num: number of logs
-log-level error
+log-level info
 # log-file /var/log/smartdns.log
 # log-size 128k
 # log-num 2
@@ -59,17 +66,20 @@ log-level error
 # audit-num 2
 
 # remote udp dns server list
-# server [IP]:[PORT], default port is 53
-# server 8.8.8.8
+# server [IP]:[PORT] [-blacklist-ip]
+# default port is 53
+# server 8.8.8.8 -blacklist-ip
 
 # remote tcp dns server list
-# server-tcp [IP]:[PORT], default port is 53
+# server-tcp [IP]:[PORT] [-blacklist-ip]
+# default port is 53
 # server-tcp 8.8.8.8
 
 # remote tls dns server list
-# server-tls [IP]:[PORT], default port is 853
-#server-tls 8.8.8.8
-#server-tls 1.0.0.1
+# server-tls [IP]:[PORT] [-blacklist-ip]
+# default port is 853
+# server-tls 8.8.8.8
+# server-tls 1.0.0.1
 
 # specific address to domain
 # address /domain/ip