F:/thesis_austausch/dissertation/code_docu_doxygen/Client/utils_client.py

Go to the documentation of this file.

#!/usr/bin/env python
'''
This module provides basic funcitons for the client_classes.py and start_client.py.

Reading University
MSc in Network Centered Computing
a.weise - a.weise@reading.ac.uk - December 2005
'''

import ConfigParser, string, os, sys, termios

def LoadConfig(file_name, config={}):
    """
    returns a dictionary with key's of the form
    <section>.<option> and the values
    
    source: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/65334
    """
    config = config.copy()
    cp = ConfigParser.ConfigParser()
    cp.read(file_name)
    for sec in cp.sections():
        name = string.lower(sec)
        for opt in cp.options(sec):
            config[name + "." + string.lower(opt)] = string.strip(cp.get(sec, opt))
    return config

def check_ip(ip):
    '''
    This function check if a given IP is valid.
    '''
    try:
        ip = ip.split(".")
    except AttributeError:
        return -1
    
    for i in range(len(ip)):
        check =  ip[i].find("0", 0, 1)
        if -1 != check and 1 < len(ip[i]):
            return -1
        try:
            ip[i] = int(ip[i])
        except ValueError:
            return -1
        if ip[i] >= 0 and ip[i] <= 255:
            pass
        else:
            return -1
        
    return 0

def usage_exit(progname, msg=None):
    '''
    This function gives usage help and exits script.
    '''
    if msg:
        print msg
        print # lf cr
    print "usage: python %s [ -h|--help -c|--config -p|--smtp_passord -v|--verbose -d|--daemon] \n\n" % progname
    os._exit(-1)
    
def get_password(msg):
    '''
    This function reads from stdin without echoing the input.
    
    source: http://gnu.kookel.org/ftp/www.python.org/doc/faq/library.html
    modified by a. weise December 2005
    '''
    fd = sys.stdin.fileno()
    # turn off stdin's echoing
    old = termios.tcgetattr(fd)
    new = termios.tcgetattr(fd)
    new[3] = new[3] & ~termios.ICANON & ~termios.ECHO
    new[6][termios.VMIN] = 1
    new[6][termios.VTIME] = 0
    termios.tcsetattr(fd, termios.TCSANOW, new)
    s = ''    # save the characters typed and add them together
    try:
        print
        print msg
        while 1:
            c = os.read(fd, 1)
            if c == "\n":
                break
            s = s+c
    finally:
        # turn on stdin's echoing again
        termios.tcsetattr(fd, termios.TCSAFLUSH, old)
        return s    

---