Added python version

README.md

@@ -4,3 +4,4 @@ ls_echo
 Small script that will wait for a TCP connection and respond with the contents of the configured directory.
 
 Usage: ./ls_echo.rb \<port\> \<directory\>
+       ./ls_echo.py \<port\> \<directory\>

ls_echo.py

@@ -0,0 +1,95 @@
+#!/usr/bin/python
+# Copyright (c) 2013, Lily Carpenter
+# All rights reserved.
+
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+
+# * Redistributions of source code must retain the above copyright notice, this
+#   list of conditions and the following disclaimer.
+
+# * Redistributions in binary form must reproduce the above copyright notice, this
+#   list of conditions and the following disclaimer in the documentation and/or
+#   other materials provided with the distribution.
+
+# * Neither the name of the Lily Carpenter nor the names of its
+#   contributors may be used to endorse or promote products derived from
+#   this software without specific prior written permission.
+
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+usage = "./ls_echo.py <port> <directory>"
+
+import sys
+import os
+import time
+import fcntl
+import socket
+import threading
+import SocketServer
+
+if len(sys.argv) != 3:
+    print usage
+    exit(1)
+
+PORT= sys.argv[1]
+DIRECTORY = sys.argv[2]
+
+port = int(PORT)
+directory = os.path.abspath(os.path.expanduser(DIRECTORY))
+if not os.path.isdir(directory):
+    raise TypeError("Path " + directory + " does not represent a valid directory.")
+
+def get_directory_listing():
+    return os.listdir("/home/lily/")
+
+class ThreadedRequestHandler(SocketServer.BaseRequestHandler):
+    def handle(self):
+        response = "\n".join(os.listdir("/home/lily/"))
+        self.request.send(response + "\n")
+
+class ThreadedTCPServer(SocketServer.ThreadingMixIn, SocketServer.TCPServer):
+    pass
+
+if __name__ == "__main__":
+    # No standard daemon module, thanks http://daemonize.sourceforge.net/daemonize.txt
+    process_id = os.fork()
+    if process_id < 0:
+        sys.exit(1)
+    elif process_id != 0:
+        sys.exit(0)
+
+    process_id = os.setsid()
+    if process_id == -1:
+        sys.exit(1)
+
+    devnull = '/dev/null'
+    if hasattr(os, "devnull"):
+        devnull = os.devnull
+    null_descriptor = open(devnull, 'rw')
+    for descriptor in (sys.stdin, sys.stdout, sys.stderr):
+        descriptor.close()
+        descriptor = null_descriptor
+
+    os.umask(027)
+
+    os.chdir('/')
+
+    lockfile = open('/tmp/lsecho.lock', 'w')
+    fcntl.lockf(lockfile, fcntl.LOCK_EX|fcntl.LOCK_NB)
+
+    lockfile.write('%s' %(os.getpid()))
+    lockfile.flush()
+
+    server = ThreadedTCPServer(("localhost", port), ThreadedRequestHandler)
+
+    server.serve_forever()