Python：telnetlib 库高级用法举例和应用详解

import telnetlib  # 导入telnetlib模块

host = "example.com"  # 远程主机地址
port = 23  # Telnet端口，默认23
timeout = 10  # 连接超时时间

# 建立Telnet连接
telnet = telnetlib.Telnet(host, port, timeout)

# 登录过程
telnet.read_until(b"login: ")  # 读取直到出现"login: "
telnet.write(b"your-username\n")  # 输入用户名
telnet.read_until(b"Password: ")  # 读取直到出现"Password: "
telnet.write(b"your-password\n")  # 输入密码

# 执行命令
telnet.write(b"ls\n")  # 执行'ls'命令，列出目录内容
output = telnet.read_all().decode('ascii')  # 读取所有输出并解码
print(output)  # 打印输出结果

# 关闭连接
telnet.close()

import telnetlib

host = "192.168.1.1"  # 路由器的IP地址
username = "admin"  # 登录用户名
password = "admin"  # 登录密码

# 建立Telnet连接
tn = telnetlib.Telnet(host)

# 执行登录
tn.read_until(b"Username: ")
tn.write(username.encode('ascii') + b"\n")
tn.read_until(b"Password: ")
tn.write(password.encode('ascii') + b"\n")

# 执行命令
tn.write(b"show ip interface brief\n")  # 查询接口简要信息
output = tn.read_all().decode('ascii')
print(output)

# 关闭连接
tn.close()

import telnetlib

def connect_and_execute(host, user, password, command):
    try:
        tn = telnetlib.Telnet(host)
        
        tn.read_until(b"login: ")
        tn.write(user.encode('ascii') + b"\n")
        tn.read_until(b"Password: ")
        tn.write(password.encode('ascii') + b"\n")
        
        tn.write(command.encode('ascii') + b"\n")
        output = tn.read_all().decode('ascii')
        tn.close()
        
        return output
    except Exception as e:
        return f"Failed to connect to {host}: {str(e)}"

hosts = ["server1.example.com", "server2.example.com"]  # 服务器列表
command = "uptime"  # 要执行的命令

# 批量执行命令
for host in hosts:
    result = connect_and_execute(host, "your-username", "your-password", command)
    print(f"Output from {host}: \n{result}")