Add README and code for pubIp

.gitignore

@@ -0,0 +1,3 @@
+*.py
+*.pyc
+*.swp

README.md

@@ -0,0 +1,17 @@
+pubIp
+=====
+
+Simple dynamic DNS resolver which works with
+[Tomato](http://www.polarcloud.com/tomato) and requires [Python
+3](http://python.org).
+
+## `/`:
+
+Shows the current IP that is set
+
+## `/update/:ip`:
+
+Updates the current IP.
+
+`:ip` must match the request client address.
+

pubip.py

@@ -0,0 +1,59 @@
+#!/usr/bin/python3
+
+import http.server
+import socket
+
+class pubIpServer(http.server.HTTPServer):
+  current_ip = 'n/a'
+
+
+class pubIpHandler(http.server.BaseHTTPRequestHandler):
+  def do_GET(self):
+    self.send_response(200)
+    self.send_header('Content-type','text/html')
+    self.end_headers()
+    # Send the html message
+
+    c_address, c_port = self.client_address
+    s_address = self.server.current_ip
+
+    path = self.path.split('/')
+
+    if path[1] == '':
+      msg = s_address
+    elif path[1] == 'update':
+      n_address = path[2]
+
+      try:
+        socket.inet_aton(n_address)
+      except socket.error:
+        print('Error on IP conversion: {}'.format(n_address))
+        return
+
+      if n_address == s_address:
+        print('IP was identical, skipping...')
+        return
+      
+      if n_address == c_address:
+        print('Updating dynamic IP: {}'.format(n_address))
+        self.server.current_ip = n_address
+      else:
+        print('Update IP mismatch: {}, {}'.format(c_address, n_address))
+        return
+
+      msg = s_address
+    else:
+      msg = ''
+    
+    self.wfile.write(msg.encode('utf-8'))
+    return
+
+
+def run(server_class=pubIpServer, handler_class=pubIpHandler):
+  server_address = ('', 8021)
+  print('Run the server at {}'.format(server_address))
+  http = server_class(server_address, handler_class)
+  http.serve_forever()
+
+if __name__ == '__main__':
+  run()