# coding: utf-8

import paramiko
import re
from time import sleep
def ssh():
    ssh = paramiko.SSHClient()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())    #指定當(dāng)對(duì)方主機(jī)沒有本機(jī)公鑰的情況時(shí)應(yīng)該怎么辦，AutoAddPolicy表示自動(dòng)在對(duì)方主機(jī)保存下本機(jī)的秘鑰
    ssh.connect('172.16.1.5',22,'linyouyi','123456')    #SSH端口默認(rèn)22，可改
    stdin,stdout,stderr = ssh.exec_command("df -hl")    #這三個(gè)得到的都是類文件對(duì)象
    outmsg,errmsg = stdout.read(),stderr.read()    #讀一次之后，stdout和stderr里就沒有內(nèi)容了，所以一定要用變量把它們帶的信息給保存下來，否則read一次之后就沒有了
    #outmsg = str(outmsg)
    #print(outmsg.replace("\\n","\\r\\n"))
    print(outmsg.decode())
    print(errmsg)
    if errmsg == "":
        print(outmsg)
    ssh.close()
if __name__ == '__main__':
    ssh()

# coding: utf-8

import paramiko
import re
from time import sleep
# 定義一個(gè)類，表示一臺(tái)遠(yuǎn)端linux主機(jī)
class Linux(object):
    # 通過IP, 用戶名，密碼，超時(shí)時(shí)間初始化一個(gè)遠(yuǎn)程Linux主機(jī)
    def __init__(self, ip, username, password, timeout=30):
        self.ip = ip
        self.username = username
        self.password = password
        self.timeout = timeout
        # transport和chanel
        self.t = ''
        self.chan = ''
        # 鏈接失敗的重試次數(shù)
        self.try_times = 3
    # 調(diào)用該方法連接遠(yuǎn)程主機(jī)
    def connect(self):
        while True:
            # 連接過程中可能會(huì)拋出異常，比如網(wǎng)絡(luò)不通、鏈接超時(shí)
            try:
                self.t = paramiko.Transport(sock=(self.ip, 22))
                self.t.connect(username=self.username, password=self.password)
                self.chan = self.t.open_session()
                self.chan.settimeout(self.timeout)
                self.chan.get_pty()
                self.chan.invoke_shell()
                # 如果沒有拋出異常說明連接成功，直接返回
                print(u'連接%s成功' % self.ip)
                # 接收到的網(wǎng)絡(luò)數(shù)據(jù)解碼為str
                print(self.chan.recv(65535).decode('utf-8'))
                return
            # 這里不對(duì)可能的異常如socket.error, socket.timeout細(xì)化，直接一網(wǎng)打盡
            except Exception as e1:
                if self.try_times != 0:
                    print(u'連接%s失敗，進(jìn)行重試' %self.ip)
                    self.try_times -= 1
                else:
                    print(u'重試3次失敗，結(jié)束程序')
                    exit(1)
    # 斷開連接
    def close(self):
        self.chan.close()
        self.t.close()
    # 發(fā)送要執(zhí)行的命令
    def send(self, cmd):
        cmd += '\r'
        # 通過命令執(zhí)行提示符來判斷命令是否執(zhí)行完成
        p = re.compile(r']$')
        result = ''
        # 發(fā)送要執(zhí)行的命令
        self.chan.send(cmd)
        # 回顯很長(zhǎng)的命令可能執(zhí)行較久，通過循環(huán)分批次取回回顯
            sleep(2)
            ret = self.chan.recv(65535)
            ret = ret.decode('utf-8')
            result += ret
            if p.search(ret):
                print(result)
                return(result)
                
if __name__ == '__main__':
    host = Linux('172.16.1.5', 'linyouyi', '123456')
    host.connect()
    host.send('ll')
    host.close()