Question

创建使用libssh2访问远程服务器的python脚本 - 我想创建访问远程服务器的python脚本，该远程服务器进一步访问同一会话中的另一个服务器。这应该返回一个到主机comp的通道。我想然后执行这个频道中的命令可以说是例如访问数据库。我已经用libssh2库试了但是卡住了。有人可以帮我这个，谢谢

Answer 1

SSH2的事实上的Python模块是paramiko，它不使用libssh2。

Answer 2

已经有python binding for libssh2了。也许它可以让你的工作更轻松......

Answer 3

带有Python绑定的Libssh2比Paramiko快得多。

Python绑定：https://pypi.org/project/ssh2-python/
API：https://pypi.org/project/ssh2-python/

#!/usr/bin/python3
import socket
import os
import time

from ssh2.session import Session  #@UnresolvedImport in eclipse

class ssh_session:
    def __init__(self,user, password, host = "localhost",port=22):
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.connect((host, port))
        self.s = Session()
        self.s.handshake(sock)
        self.s.userauth_password(user, password)        
        self.chan = self.s.open_session()
        self.chan.shell()
        self.s.set_blocking(False)  #switch to non-blocking
        self.received_bytes=0

    def read(self,minwait=0.01):   #10 ms wait are enough for localhost  
        buf = b""                  #when you send simple commands
        startread=time.time()
        while True:
            size, data = self.chan.read()
            if size > 0: 
                buf+=data
                self.received_bytes+=size
                time.sleep(0.01)
            if minwait > 0:  # if we have a larger minwait than wait
                timedelta = time.time()-startread
                if timedelta > minwait: 
                    break    
            else:
                break  # non-blocking return with zero minwait
            #repeat the while loop until minwait       
        return (buf.decode())      
                     
    def write(self,cmd):
        self.chan.write(cmd+"\n")       

user="<user>"
passwd="<pass>"
contime = time.time()    
timedelta = 0            
con1 = ssh_session(user,passwd)   #create connection instance

#skip banner aka os welcome message
#banner should be done after 1 second or more than 200 received Bytes
while timedelta < 1 and con1.received_bytes < 200:
    timedelta = time.time() - contime
    con1.read()   #just read but do not print
      
#send command to host
con1.write("pwd")
#receive answer, on localhost connection takes just about 0.3ms
print (con1.read())   #you can pass a minimum wait time in seconds here
                      #e.g. con1.read(0.8) # wait 0.8 seconds

创建使用libssh2访问远程服务器的python脚本

3 个答案: