Python学习——实现secure copy功能

def run_scp(from1, to, passwd, log_file):
    cmd = "scp %s %s" % (from1, to)
    p = pexpect.spawn(cmd)
    if log_file is None:
        log_file = sys.__stdout__
    p.logfile = open_log_file(log_file)
    basename = os.path.basename(from1)
    index = p.expect(["[Pp]assword:","(yes/no)",basename,pexpect.EOF])
    if index == 0:
        p.sendline(passwd)
    elif index == 1:
        p.sendline("yes")
        p.expect("[Pp]assword:")
        p.sendline(passwd)
    elif index == 2:
        pass
    else:
        raise Exception("Fail to scp")

def scp_to_server(local_file, server_ip, server_file, user=‘root‘, passwd=‘xxx‘, log_file=None):
    if not os.path.exists(local_file):
        raise Exception("File %s don‘t exist." % local_file)
    if not run_scp(local_file, "%s@%s:%s" % (user,server_ip,server_file),passwd,log_file):
        raise Exception("Wrong password to server!")

def scp_from_server(server_ip, server_file, local_file, user=‘root‘, passwd=‘xxx‘,log_file=None):
    if not run_scp("%s@%s:%s" % (user,server,path),local_file,passed,log_file):
        raise Exception("Wrong password to server!")