Add function to get BGP advertised prefixes

Main.go

@@ -9,17 +9,22 @@ func main() {
 	printHeader()
 
 	var input string
+	var wantPrefixes bool
 	localIPAddress := getLocalIP()
 	flag.StringVar(&input, "i", localIPAddress, "Specify IP address or domain name.")
+	flag.BoolVar(&wantPrefixes, "p", false, "Enable printing of advertised BGP prefixes.")
 	flag.Parse()
 	var isIPCorrect bool = checkIPSyntax(input)
 	if isIPCorrect == true {
-		printIPInfo(input)
+		printIPInfo(input, wantPrefixes)
 	} else {
-		// fmt.Println(ipaddress, "is not a valid IP address.")
-		fmt.Println("Domain Name:	", input)
 		ipaddress := resolveDNSHostname(input)
-		printIPInfo(ipaddress)
+		if checkIPSyntax(ipaddress) == true {
+			fmt.Println("Domain Name:	", input)
+			printIPInfo(ipaddress, wantPrefixes)
+		} else {
+			fmt.Println("Invalid query.")
+		}
 	}
 
 }