From 4201a704f815b2ad889bec32a51c226e4bf34aec Mon Sep 17 00:00:00 2001
From: cynic <cynic@mesh.kyun.li>
Date: Thu, 13 Jun 2024 10:04:38 +0000
Subject: [PATCH] add whoami
---
whoami.go | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
create mode 100644 whoami.go
diff --git a/whoami.go b/whoami.go
new file mode 100644
index 0000000..b3a00ad
--- /dev/null
+++ b/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)
+}
+