the server is somewhat usable now

esgd.py

@@ -1,9 +1,12 @@
 import socketserver
+import subprocess
 import os
 
 class GopherError(BaseException): pass
 class RequestError(GopherError): pass
 
+print(os.getcwd())
+
 def recieveRequest(context):
     data = b''
     while data[-2:] != b'\r\n':
@@ -12,6 +15,7 @@ def recieveRequest(context):
     return decoded
 
 def requestParser(request):
+    if '..' in request: raise RequestError
     try:
         if request[0] == '/': request = request[1:]
     except IndexError: pass
@@ -39,6 +43,9 @@ def fileCGI(file):
 def notFound(context):
     context.request.sendall(b"3error: file not found!\r\n.\r\n")
 
+def invalid(context):
+    context.request.sendall(b"3error: selector contains '..'!\r\n.\r\n")
+
 def sendFile(file, context):
     with open(file, "r") as fd:
         [context.request.sendall(
@@ -46,21 +53,50 @@ def sendFile(file, context):
         ) for i in fd.readlines()]
         context.request.sendall(b".\r\n")
 
+def cgi(file, query, context):
+    env = {}
+    env['QUERY_STRING'] = query
+    env['SCRIPT_NAME'] = "/" + file
+    env['REMOTE_ADDR'] = context.client_address[0]
+
+    proc = subprocess.Popen(
+        [os.getcwd() + "/" + file],
+        stdout = subprocess.PIPE,
+        env = env
+    )
+
+    try: out, err = proc.communicate(timeout=10)
+    except TimeoutExpired:
+        proc.kill()
+        out, err = proc.communicate()
+
+    return out.decode('utf-8').replace('\r', '').split('\n')
+
 class gopherHandler(socketserver.BaseRequestHandler):
     def handle(self):
         decoded = recieveRequest(self)
+        try:
             parsed = requestParser(decoded)
+        except RequestError:
+            invalid(self)
+            return
+
+        print(self.client_address)
 
         try: file = returnRelative(parsed[0])
         except RequestError:
             notFound(self)
             return
-
-        if fileSendable(file[0]): sendFile(file[0], self)
+        if fileCGI(file[0]):
+            ret = cgi(file[0], parsed[1], self)
+            for i in ret:
+                self.request.sendall((i + '\r\n').encode('utf-8'))
+                self.request.sendall(b'.\r\n')
+        elif fileSendable(file[0]): sendFile(file[0], self)
         else: notFound(self)
 
 if __name__ == "__main__":
-    HOST, PORT = "localhost", 85
+    HOST, PORT = "localhost", 72
 
     with socketserver.TCPServer((HOST, PORT), gopherHandler) as server:
         server.serve_forever()