From 44d4a91bfa29b3d2c5aba887acecb523b89ec90a Mon Sep 17 00:00:00 2001
From: ston1th <ston1th@giftfish.de>
Date: Wed, 7 Sep 2016 22:55:59 +0200
Subject: [PATCH] initial commit

---
 .gitignore |  2 ++
 ddns.go    | 39 +++++++++++++++++++++++++++++++++++++++
 make.sh    |  2 ++
 3 files changed, 43 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 ddns.go
 create mode 100755 make.sh

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..61aa9bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+ddns
+KEY
diff --git a/ddns.go b/ddns.go
new file mode 100644
index 0000000..f6fd994
--- /dev/null
+++ b/ddns.go
@@ -0,0 +1,39 @@
+package main
+
+import (
+	"crypto/subtle"
+	"net/http"
+	"sync"
+)
+
+var (
+	mu  sync.RWMutex
+	ip  string
+	key string
+)
+
+func main() {
+	http.HandleFunc("/get", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == "GET" {
+			mu.RLock()
+			defer mu.RUnlock()
+			w.Write([]byte(ip))
+			return
+		}
+		http.Error(w, "bad request", http.StatusBadRequest)
+	})
+	http.HandleFunc("/set", func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == "GET" {
+			r.ParseForm()
+			if subtle.ConstantTimeCompare([]byte(key), []byte(r.FormValue("token"))) == 1 {
+				mu.Lock()
+				defer mu.Unlock()
+				ip = r.FormValue("ip")
+				w.Write([]byte("ok"))
+				return
+			}
+		}
+		http.Error(w, "bad request", http.StatusBadRequest)
+	})
+	panic(http.ListenAndServe("127.0.0.1:9090", nil))
+}
diff --git a/make.sh b/make.sh
new file mode 100755
index 0000000..6f46763
--- /dev/null
+++ b/make.sh
@@ -0,0 +1,2 @@
+#!/bin/sh
+go build -ldflags="-X main.key=$(cat KEY) -s -w"