add whoami

whoami.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"net/http"
+	"net"
+	"strings"	
+        "encoding/base32"
+)
+
+// 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])
+	tld := ".mesh.cat"
+	domain := strings.Join([]string{host, tld}, "")
+	return domain
+}
+
+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)))
+	}
+}
+
+func main() {
+	http.HandleFunc("/", handler)
+	http.ListenAndServe(":3000", nil)
+}
+