#!/usr/bin/env python
# Simple finger client -- uses file object created from socket

import sys
from socket import * # So I don't have to prefix with "socket"
import string
FINGERPORT = 79 # standard port for finger

def finger(user, machine, port=FINGERPORT):
    # create a socket and connect to port on machine
    s = socket(AF_INET, SOCK_STREAM)
    s.connect((machine, port))

    # send the user name
    s.send(user+"\r\n")

    # convert socket to a file for reading
    infile = s.makefile()
    data = infile.read()

    s.close()

    return data


def main():
    try:
        user_machine = sys.argv[1]
        user, machine = string.splitfields(user_machine, "@")
        if len(sys.argv)>2:
           port = int(sys.argv[2])
        else:
           port = FINGERPORT
    except:
        print "Usage: finger.py user@machine [port_number]"
        raise SystemExit

    print finger(user, machine, port)

if __name__=="__main__": main()