感觉网上很多的东西比较零零散散，这次整合一个可以扫描网段的ip地址并爬取IP地址中可以匿名登陆FTP的数据

1. 扫描一个网段，获取其中所有的开放FTP服务的机器的IP地址
2. 依次获取每个FTP的文件目录内容，从每个FTP中下载一定量的文件

import platform
import sys
import os
import time
import _thread
import datetime
from ftplib import FTP


class FTP_P(FTP):
    def dirs(self, *args):
        cmd = 'LIST'
        templist = []
        func = None
        if args[-1:] and type(args[-1]) != type(''):
            args, func = args[:-1], args[-1]
        for arg in args:
            if arg:
                cmd = cmd + (' ' + arg)
        self.retrlines(cmd, templist.append)
        return templist

def download_single_url_ftp(stri):
    try:
        ftp = FTP_P()
        ftp.encoding = "utf-8"
        ftp.connect(stri,21)  # 连接的ftp sever和端口
        ftp.login("anonymous")  # 连接的用户名，密码
        # print(ftp.getwelcome()) #打印出欢迎信息
        ftp.cwd(r"/")  # 设置FTP当前操作的路径
        for i in ftp.dirs():
            print(i+'')
        ftpath = '/'
        localpath = 'D:/data/'
        ftpDownload(ftp,ftpath,localpath)
        ftp.quit()  # 退出ftp
    except (ConnectionRefusedError, TimeoutError, WindowsError) as e:
            print("{}的Ftp连接失败 {}".format(stri,str(e)))
            print()
            pass
    except BaseException as e:
            print("{}的Ftp连接失败 {}".format(stri,str(e)))
            print()
            pass
            def ftpDownload(ftp, ftpath, localpath):
    '''
    :param ftp: 登陆ftp返回的信息
    :param ftpath: ftp中的目标路径
    :param localpath: 存放下载文件的本地路径
    :return:
    '''
    print('Remote Path: {0}'.format(ftpath))
    if not os.path.exists(localpath):
        os.makedirs(localpath)#如果文件不在创建文件
    for file in ftp.nlst():
        print('file:', file)
        if len(ftp.nlst(file)) == 0:
            pass
        elif file == ftp.nlst(file)[0]:
            print('扫描到文件')
            ftpDownloadFile(ftp,file, localpath)
        else:
            print('扫描到文件夹')
            path = ftp.pwd() + '/' + file
            local = localpath+'/'+ file
            ftp.cwd(path)
            ftpDownload(ftp, path, local)#递归
            ftp.cwd('..')
    return True
#python saomiao.py 149

def ftpDownloadFile(ftp, ftpfile, localfile):
    bufsize = 1024
    path = os.path.join(localfile,ftpfile)
    with open(path, 'wb') as fid:
        print('正在下载：',ftpfile)
        ftp.retrbinary('RETR {0}'.format(ftpfile), fid.write, bufsize)  # 接收服务器文件并写入本地文件
        print('下载完毕。')
    return True
def get_os():
    os = platform.system()
    if os == "Windows":
        return "n"
    else:
        return "c"

def ping_ip(ip_str):
    cmd = ["ping", "-{op}".format(op=get_os()),
           "1", ip_str]
    output = os.popen(" ".join(cmd)).readlines()

    flag = False
    for line in list(output):
        if not line:
            continue
        if str(line).upper().find("TTL") >=0:#判断存活时间
            flag = True
            break
    if flag:
        print("*** *** *** ip: %s 可以ping通  *** *** ***"%(ip_str))
        download_single_url_ftp(ip_str)

def find_ip(ip_prefix):
    for i in range(1,256):
        ip = ('%s.%s'%(ip_prefix,i))
        _thread.start_new_thread(ping_ip, (ip,))
        time.sleep(0.5)
        # ping_ip(ip)

if __name__ == "__main__":
    startTime = datetime.datetime.now()
    print("start time %s"%(time.ctime()))
    net=sys.argv[1]
    args = "".join(("211.71."+net+".1"))#211.71.149
    ip_prefix = '.'.join(args.split('.')[:-1])#211.71.149

    find_ip(ip_prefix)

    endTime = datetime.datetime.now()
    print("end time %s"%(time.ctime()))
    print("total takes :",(endTime - startTime).seconds)