rename file

cmd/whoami/main.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"net/http"
+	"net"
+        "encoding/base32"
+	"strings"
+	"flag"
+)
+
+// define tld
+var tld = flag.String("tld", "mesh.cat", "The top level domain for our network")
+
+// domainFromIP derives a meshname subdomain for the authoritative DNS server address
+func domainFromIP(target net.IP) string {
+        host := strings.ToLower(base32.StdEncoding.EncodeToString(target)[0:26])
+	domain := strings.Join([]string{host, ".", *tld, "\n"}, "")
+	return domain
+}
+
+// handle HTTP requests
+func handler(w http.ResponseWriter, r *http.Request) {
+	ip, port, err := net.SplitHostPort(r.RemoteAddr)
+	_, _ = port, err	
+	parsedIP := net.ParseIP(ip)
+	// return domain for IPv6 only
+	if parsedIP.To4() == nil {
+		w.Write([]byte(domainFromIP(parsedIP)))
+	} else {
+		// set the response status code to 422
+		w.WriteHeader(http.StatusUnprocessableEntity)
+		w.Write([]byte("ipv4 not supported\n"))
+	}
+}
+
+func main() {
+	// define path
+	http.HandleFunc("/", handler)
+	// define ip address
+	address := flag.String("address", "[::0]", "The interface address to listen on")
+	// define port
+	port := flag.String("port", "8008", "The port to listen on")
+	// parse the command-line arguments
+	flag.Parse()
+	// construct listening address
+	listenAddr := strings.Join([]string{*address, ":", *port}, "")
+	print("Listening on address: ", listenAddr, "\n")
+	// start server
+	http.ListenAndServe(listenAddr, nil)
+}