telnet.py 文件源码

def main():
    if len(sys.argv) < 2:
        sys.stderr.write('usage: telnet hostname [port]\n')
        sys.exit(2)
    host = sys.argv[1]
    try:
        hostaddr = gethostbyname(host)
    except error:
        sys.stderr.write(sys.argv[1] + ': bad host name\n')
        sys.exit(2)
    #
    if len(sys.argv) > 2:
        servname = sys.argv[2]
    else:
        servname = 'telnet'
    #
    if '0' <= servname[:1] <= '9':
        port = eval(servname)
    else:
        try:
            port = getservbyname(servname, 'tcp')
        except error:
            sys.stderr.write(servname + ': bad tcp service name\n')
            sys.exit(2)
    #
    s = socket(AF_INET, SOCK_STREAM)
    #
    try:
        s.connect((host, port))
    except error, msg:
        sys.stderr.write('connect failed: %r\n' % (msg,))
        sys.exit(1)
    #
    thread.start_new(child, (s,))
    parent(s)