+ dnsforward: match CNAME with filtering rules

+ GET /control/querylog: add "cname_match" field

* querylog: Add() now receives an object with parameters

querylog/querylog.go

@@ -22,7 +22,7 @@ type QueryLog interface {
 	Close()
 
 	// Add a log entry
-	Add(question *dns.Msg, answer *dns.Msg, result *dnsfilter.Result, elapsed time.Duration, ip net.IP, upstream string)
+	Add(params AddParams)
 
 	// WriteDiskConfig - write configuration
 	WriteDiskConfig(dc *DiskConfig)
@@ -42,6 +42,17 @@ type Config struct {
 	HTTPRegister func(string, string, func(http.ResponseWriter, *http.Request))
 }
 
+// AddParams - parameters for Add()
+type AddParams struct {
+	Question   *dns.Msg
+	Answer     *dns.Msg          // The response we sent to the client (optional)
+	OrigAnswer *dns.Msg          // The response from an upstream server (optional)
+	Result     *dnsfilter.Result // Filtering result (optional)
+	Elapsed    time.Duration     // Time spent for processing the request
+	ClientIP   net.IP
+	Upstream   string
+}
+
 // New - create a new instance of the query log
 func New(conf Config) QueryLog {
 	return newQueryLog(conf)