source: skype/skyped.py @ eeab8bc

#!/usr/bin/env python2.7
# 
#   skyped.py
#  
#   Copyright (c) 2007, 2008, 2009, 2010 by Miklos Vajna <vmiklos@frugalware.org>
#
#   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.
#  
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 
#   USA.
#

import sys
import os
import signal
import locale
import time
import socket
import getopt
import Skype4Py
import hashlib
from ConfigParser import ConfigParser, NoOptionError
from traceback import print_exception
import ssl
import select

__version__ = "0.1.1"

def eh(type, value, tb):
        global options

        if type != KeyboardInterrupt:
                print_exception(type, value, tb)
        options.conn.close()
        # shut down client if it's running
        try:
                skype.skype.Client.Shutdown()
        except NameError:
                pass
        sys.exit("Exiting.")

sys.excepthook = eh

def input_handler(fd, io_condition):
        global options
        if options.buf:
                for i in options.buf:
                        skype.send(i.strip())
                options.buf = None
        else:
                try:
                        input = fd.recv(1024)
                except Exception, s:
                        dprint("Warning, receiving 1024 bytes failed (%s)." % s)
                        fd.close()
                        return False
                for i in input.split("\n"):
                        skype.send(i.strip())
                return True

def skype_idle_handler(skype):
        try:
                c = skype.skype.Command("PING", Block=True)
                skype.skype.SendCommand(c)
        except Skype4Py.SkypeAPIError, s:
                dprint("Warning, pinging Skype failed (%s)." % (s))
        return True

def send(sock, txt):
        from time import sleep
        count = 1
        done = False
        while (not done) and (count < 10):
                try:
                        sock.send(txt)
                        done = True
                except Exception, s:
                        count += 1
                        dprint("Warning, sending '%s' failed (%s). count=%d" % (txt, s, count))
                        sleep(1)
        if not done:
                options.conn.close()

def bitlbee_idle_handler(skype):
        global options
        if options.conn:
                try:
                        e = "PING"
                        send(options.conn, "%s\n" % e)
                except Exception, s:
                        dprint("Warning, sending '%s' failed (%s)." % (e, s))
                        options.conn.close()
        return True

def server(host, port, skype):
        global options
        sock = socket.socket()
        sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        sock.bind((host, port))
        sock.listen(1)
        dprint("Waiting for connection...")
        listener(sock, skype)

def listener(sock, skype):
        global options
        rawsock, addr = sock.accept()
        options.conn = ssl.wrap_socket(rawsock,
                server_side=True,
                certfile=options.config.sslcert,
                keyfile=options.config.sslkey,
                ssl_version=ssl.PROTOCOL_TLSv1)
        if hasattr(options.conn, 'handshake'):
                try:
                        options.conn.handshake()
                except Exception:
                        dprint("Warning, handshake failed, closing connection.")
                        return False
        ret = 0
        try:
                line = options.conn.recv(1024)
                if line.startswith("USERNAME") and line.split(' ')[1].strip() == options.config.username:
                        ret += 1
                line = options.conn.recv(1024)
                if line.startswith("PASSWORD") and hashlib.sha1(line.split(' ')[1].strip()).hexdigest() == options.config.password:
                        ret += 1
        except Exception, s:
                dprint("Warning, receiving 1024 bytes failed (%s)." % s)
                options.conn.close()
                return False
        if ret == 2:
                dprint("Username and password OK.")
                options.conn.send("PASSWORD OK\n")
                serverloop(options, skype)
                return True
        else:
                dprint("Username and/or password WRONG.")
                options.conn.send("PASSWORD KO\n")
                return False

def dprint(msg):
        from time import strftime
        global options

        now = strftime("%Y-%m-%d %H:%M:%S")

        if options.debug:
                print now + ": " + msg
                sys.stdout.flush()
        if options.log:
                sock = open(options.log, "a")
                sock.write("%s: %s\n" % (now, msg))
                sock.close()

class SkypeApi:
        def __init__(self):
                self.skype = Skype4Py.Skype()
                self.skype.OnNotify = self.recv
                self.skype.Client.Start()

        def recv(self, msg_text):
                global options
                if msg_text == "PONG":
                        return
                if "\n" in msg_text:
                        # crappy skype prefixes only the first line for
                        # multiline messages so we need to do so for the other
                        # lines, too. this is something like:
                        # 'CHATMESSAGE id BODY first line\nsecond line' ->
                        # 'CHATMESSAGE id BODY first line\nCHATMESSAGE id BODY second line'
                        prefix = " ".join(msg_text.split(" ")[:3])
                        msg_text = ["%s %s" % (prefix, i) for i in " ".join(msg_text.split(" ")[3:]).split("\n")]
                else:
                        msg_text = [msg_text]
                for i in msg_text:
                        # use utf-8 here to solve the following problem:
                        # people use env vars like LC_ALL=en_US (latin1) then
                        # they complain about why can't they receive latin2
                        # messages.. so here it is: always use utf-8 then
                        # everybody will be happy
                        e = i.encode('UTF-8')
                        dprint('<< ' + e)
                        if options.conn:
                                try:
                                        # I called the send function really_send
                                        send(options.conn, e + "\n")
                                except Exception, s:
                                        dprint("Warning, sending '%s' failed (%s)." % (e, s))
                                        options.conn.close()

        def send(self, msg_text):
                if not len(msg_text) or msg_text == "PONG":
                        return
                try:
                        encoding = locale.getdefaultlocale()[1]
                        if not encoding:
                                raise ValueError
                        e = msg_text.decode(encoding)
                except ValueError:
                        e = msg_text.decode('UTF-8')
                dprint('>> ' + e)
                try:
                        c = self.skype.Command(e, Block=True)
                        self.skype.SendCommand(c)
                        self.recv(c.Reply)
                except Skype4Py.SkypeError:
                        pass
                except Skype4Py.SkypeAPIError, s:
                        dprint("Warning, sending '%s' failed (%s)." % (e, s))

class Options:
        def __init__(self):
                self.cfgpath = os.path.join(os.environ['HOME'], ".skyped", "skyped.conf")
                # for backwards compatibility
                self.syscfgpath = "/usr/local/etc/skyped/skyped.conf"
                if os.path.exists(self.syscfgpath):
                        self.cfgpath = self.syscfgpath
                self.daemon = True
                self.debug = False
                self.help = False
                self.host = "0.0.0.0"
                self.log = None
                self.port = None
                self.version = False
                # well, this is a bit hackish. we store the socket of the last connected client
                # here and notify it. maybe later notify all connected clients?
                self.conn = None
                # this will be read first by the input handler
                self.buf = None


        def usage(self, ret):
                print """Usage: skyped [OPTION]...

skyped is a daemon that acts as a tcp server on top of a Skype instance.

Options:
        -c      --config        path to configuration file (default: %s)
        -d      --debug         enable debug messages
        -h      --help          this help
        -H      --host          set the tcp host (default: %s)
        -l      --log           set the log file in background mode (default: none)
        -n      --nofork        don't run as daemon in the background
        -p      --port          set the tcp port (default: %s)
        -v      --version       display version information""" % (self.cfgpath, self.host, self.port)
                sys.exit(ret)

def serverloop(options, skype):
        timeout = 1; # in seconds
        skype_ping_period = 5
        bitlbee_ping_period = 30
        skype_ping_start_time = time.time()
        bitlbee_ping_start_time = time.time()
        while 1:
                ready_to_read, ready_to_write, in_error = \
                        select.select([options.conn], [], [], timeout)
                now = time.time()
                if len(ready_to_read) == 1:
                        input_handler(ready_to_read.pop(), options)
                        # don't ping bitlbee/skype if they already received data
                        bitlbee_ping_start_time = now
                        skype_ping_start_time = now
                if now - skype_ping_period > skype_ping_start_time:
                        skype_idle_handler(skype)
                        skype_ping_start_time = now
                if now - bitlbee_ping_period > bitlbee_ping_start_time:
                        bitlbee_idle_handler(skype)
                        bitlbee_ping_start_time = now

if __name__=='__main__':
        options = Options()
        try:
                opts, args = getopt.getopt(sys.argv[1:], "c:dhH:l:np:v", ["config=", "debug", "help", "host=", "log=", "nofork", "port=", "version"])
        except getopt.GetoptError:
                options.usage(1)
        for opt, arg in opts:
                if opt in ("-c", "--config"):
                        options.cfgpath = arg
                elif opt in ("-d", "--debug"):
                        options.debug = True
                elif opt in ("-h", "--help"):
                        options.help = True
                elif opt in ("-H", "--host"):
                        options.host = arg
                elif opt in ("-l", "--log"):
                        options.log = arg
                elif opt in ("-n", "--nofork"):
                        options.daemon = False
                elif opt in ("-p", "--port"):
                        options.port = int(arg)
                elif opt in ("-v", "--version"):
                        options.version = True
        if options.help:
                options.usage(0)
        elif options.version:
                print "skyped %s" % __version__
                sys.exit(0)
        # parse our config
        if not os.path.exists(options.cfgpath):
                print "Can't find configuration file at '%s'." % options.cfgpath
                print "Use the -c option to specify an alternate one."
                sys.exit(1)
        options.config = ConfigParser()
        options.config.read(options.cfgpath)
        options.config.username = options.config.get('skyped', 'username').split('#')[0]
        options.config.password = options.config.get('skyped', 'password').split('#')[0]
        options.config.sslkey = os.path.expanduser(options.config.get('skyped', 'key').split('#')[0])
        options.config.sslcert = os.path.expanduser(options.config.get('skyped', 'cert').split('#')[0])
        # hack: we have to parse the parameters first to locate the
        # config file but the -p option should overwrite the value from
        # the config file
        try:
                options.config.port = int(options.config.get('skyped', 'port').split('#')[0])
                if not options.port:
                        options.port = options.config.port
        except NoOptionError:
                pass
        if not options.port:
                options.port = 2727
        dprint("Parsing config file '%s' done, username is '%s'." % (options.cfgpath, options.config.username))
        if options.daemon:
                pid = os.fork()
                if pid == 0:
                        nullin = file(os.devnull, 'r')
                        nullout = file(os.devnull, 'w')
                        os.dup2(nullin.fileno(), sys.stdin.fileno())
                        os.dup2(nullout.fileno(), sys.stdout.fileno())
                        os.dup2(nullout.fileno(), sys.stderr.fileno())
                else:
                        print 'skyped is started on port %s, pid: %d' % (options.port, pid)
                        sys.exit(0)
        else:
                dprint('skyped is started on port %s' % options.port)
        try:
                skype = SkypeApi()
        except Skype4Py.SkypeAPIError, s:
                sys.exit("%s. Are you sure you have started Skype?" % s)
        server(options.host, options.port, skype)