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fileserv-06.py
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#!/usr/bin/env python
#
# fileserv.py -- an ad-hoc single file webserver
# Copyright (C) 2004 Simon Budig <simon@budig.de>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# A copy of the GNU General Public License is available at
# http://www.fsf.org/licenses/gpl.txt, you can also write to the
# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
# Boston, MA 02111-1307, USA.
import os, sys, select, getopt, commands
import urllib, BaseHTTPServer, SimpleHTTPServer
maxdownloads = 1
cpid = -1
# Utility function to guess the IP (as a string) where the server can be
# reached from the outside. Quite nasty problem actually.
def find_ip ():
os.environ["PATH"] = "/sbin:/usr/sbin:/usr/local/sbin:" + os.environ["PATH"]
netstat = commands.getoutput ("LC_MESSAGES=C netstat -rn")
defiface = [i.split ()[-1] for i in netstat.split ('\n')
if i.split ()[0] == "0.0.0.0"]
if not defiface:
return None
ifcfg = commands.getoutput ("LC_MESSAGES=C ifconfig "
+ defiface[0]).split ("inet addr:")
if len (ifcfg) != 2:
return None
ip_addr = ifcfg[1].split ()[0]
# sanity check
try:
ints = [ i for i in ip_addr.split (".") if 0 <= int(i) <= 255]
if len (ints) != 4:
return None
except ValueError:
return None
return ip_addr
# Main class implementing an HTTP-Requesthandler, that serves just a single
# file and redirects all other requests to this file (this passes the actual
# filename to the client).
# Currently it is impossible to serve different files with different
# instances of this class.
class FileServHTTPRequestHandler (BaseHTTPServer.BaseHTTPRequestHandler):
server_version = "Simons FileServer"
protocol_version = "HTTP/1.0"
filename = "."
def log_request (self, code='-', size='-'):
if code == 200:
BaseHTTPServer.BaseHTTPRequestHandler.log_request (self, code, size)
def do_GET (self):
global maxdownloads, cpid
# Redirect any request to the filename of the file to serve.
# This hands over the filename to the client.
self.path = urllib.quote (urllib.unquote (self.path))
location = "/" + urllib.quote (os.path.basename (self.filename))
if os.path.isdir (self.filename):
location += ".tar.gz"
if self.path != location:
txt = """\
<html>
<head><title>302 Found</title></head>
<body>302 Found <a href="%s">here</a>.</body>
</html>\n""" % location
self.send_response (302)
self.send_header ("Location", location)
self.send_header ("Content-type", "text/html")
self.send_header ("Content-Length", str (len (txt)))
self.end_headers ()
self.wfile.write (txt)
return
maxdownloads -= 1
# let a separate process handle the actual download, so that
# multiple downloads can happen simultaneously.
cpid = os.fork ()
if cpid == 0:
# Child process
size = -1
datafile = None
if os.path.isfile (self.filename):
size = os.path.getsize (self.filename)
datafile = open (self.filename)
elif os.path.isdir (self.filename):
os.environ['fileserv_dir'], os.environ['fileserv_file'] = os.path.split (self.filename)
datafile = os.popen ('cd "$fileserv_dir";tar cfz - "$fileserv_file"')
self.send_response (200)
self.send_header ("Content-type", "application/octet-stream")
if size >= 0:
self.send_header ("Content-Length", size)
self.end_headers ()
while 1:
if select.select ([datafile], [], [], 2)[0]:
c = datafile.read (1024)
if c:
self.wfile.write (c)
else:
datafile.close ()
return
def serve_files (filename, maxdown = 1, port = 8080):
global maxdownloads
maxdownloads = maxdown
# We have to somehow push the filename of the file to serve to the
# class handling the requests. This is an evil way to do this...
FileServHTTPRequestHandler.filename = filename
httpd = BaseHTTPServer.HTTPServer (('', port),
FileServHTTPRequestHandler)
ip = find_ip ()
if ip:
print "Now serving on http://%s:%s/" % (ip, httpd.server_port)
while cpid != 0 and maxdownloads > 0:
httpd.handle_request ()
def usage (errmsg = None):
name = os.path.basename (sys.argv[0])
print >>sys.stderr, """
Usage: %s [-p <port>] [-c <count>] <file/dir>
%s [-p <port>] [-c <count>] -s
Serves a single file <count> times via http on port <port>."
When a directory is specified, a .tar.gz archive gets served,"
when -s is specified instead of a filename, %s distributes itself.
defaults: count = 1, port = 8080
""" % (name, name, name)
if errmsg:
print >>sys.stderr, errmsg
print >>sys.stderr
sys.exit (1)
def main ():
global cpid
maxdown = 1
port = 8080
try:
options, filenames = getopt.getopt (sys.argv[1:], "hsc:p:")
except getopt.GetoptError, desc:
usage (desc)
for option, val in options:
if option == '-c':
try:
maxdown = int (val)
if maxdown <= 0:
raise ValueError
except ValueError:
usage ("invalid download count: %r. "
"Please specify an integer >= 0." % val)
elif option == '-p':
try:
port = int (val)
except ValueError:
usage ("invalid port number: %r. Please specify an integer" % value)
elif option == '-s':
filenames.append (__file__)
elif option == '-h':
usage ()
else:
usage ("Unknown option: %r" % option)
if len (filenames) == 1:
filename = os.path.abspath (filenames[0])
else:
usage ("Can only serve single files/directories.")
if not os.path.exists (filename):
usage ("%s: No such file or directory" % filenames[0])
if not (os.path.isfile (filename) or os.path.isdir (filename)):
usage ("%s: Neither file nor directory" % filenames[0])
serve_files (filename, maxdown, port)
# wait for child processes to terminate
if cpid != 0:
try:
while 1:
os.wait ()
except OSError:
pass
if __name__=='__main__':
try:
main ()
except KeyboardInterrupt:
pass

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