Topic - python 使用telnetlib登陆telnet服务器

```python
import telnetlib
import time
import logging
import re
import ipaddress
from ipaddress import ip_address
logging.basicConfig(format='%(asctime)s - %(pathname)s - [line:%(lineno)d] - %(levelname)s: %(message)s',
                    level=logging.DEBUG)
username = ['0000000', 'huawei','root','huawei123','huawei1234']
password = ['Root@123','Huawei@123','Huawei@1234','huawei@123','huawei@1234','Root@1234']

def contains_chars(s, chars):
    pattern = f"[{''.join(chars)}]"
    return bool(re.search(pattern, s))

def get_device_type(tn):
    tn.write(b"display device\r\n")
    time.sleep(1)
    output = tn.read_very_eager().decode().strip()
    lines = output.split('\n')
    for line in lines:
        if 's device status' in line:
            type_str = line.split('s device status')[0]
            print(type_str)
    return 'unknow'

def login(host, port, user, pwd):
    try:
        tn = telnetlib.Telnet(host, port, 5)
        #tn.set_debuglevel(2)
    except:
        return 2
    time.sleep(1)
    try:
        output = tn.read_very_eager().decode().strip()
    except:
        tn.close()
        return 4
    print(output)
    # 出现 > 说明已登录，不需要密码
    if '>' in output:
        print('login ok, no password')
        get_device_type(tn)
        tn.close()
        return 3
    tn.write(user.encode('ascii') + b'\r\n')
    tn.read_until(b"Password:")
    tn.write(pwd.encode('ascii') + b'\r\n')
    time.sleep(1)
    try:
        output = tn.read_very_eager().decode().strip()
        if 'Authentication fail' in output:
            tn.close()
            return 1
    except:
        tn.close()
        return 1
    get_device_type(tn)
    tn.close()
    return 0
def device_login(host, port):
    for i in range(len(username)):
        for j in range(len(password)):
            ret = login(host, port, username[i], password[j])
            if  ret == 0 :
                print(host, ':', port, 'login ok', username[i], password[j])
                return ret
            elif ret == 1:
                #print(username[i], password[j], 'username or password is wrong ')
                pass
            elif ret == 2:
                #print(host, ':', port, 'connecting failed.')
                return ret
            elif ret == 3:
                print(host, ':', port, 'login ok, with no password.')
                return ret
            elif ret == 4:
                print(host, ':', port, 'login failed, lock by remote.')
                return ret
            else:
                print('system error')
                return -1
def device_discovery():
    port = 23
    for ip in ipaddress.IPv4Network('120.94.23.0/20'):
        device_login(str(ip), port)
def device_discovery_test():
    port = 23
    device_login('7.220.108.234', port)
if __name__ == "__main__":
    device_discovery()
    #device_discovery_test()

```

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