Before reading further, make yourself familiar with How to Install Python
Below is updated script from article SSH with Python to automatically execute ‘sh ver’ and print the results:
import paramiko
host = '192.168.1.66'
user = 'cisco'
secret = 'cisco'
port = 22
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) #Set policy to use when connecting to servers without a known host key
ssh.connect(hostname=host, username=user, password=secret, port=port)
stdin, stdout, stderr = ssh.exec_command('sh ver')
output = stdout.readlines()
print (''.join(output))
Use IDLE shell to execute the script for convenience.
Result:
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T14, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Tue 17-Aug-10 09:00 by prod_rel_team
ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)
R1 uptime is 1 hour, 13 minutes
System returned to ROM by power-on
System image file is "flash:c2800nm-advipservicesk9-mz.124-15.T14.bin"
This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.
A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html
If you require further assistance please contact us by sending email to
export@cisco.com.
Cisco 2811 (revision 53.51) with 249856K/12288K bytes of memory.
Processor board ID FHK1223F50J
2 FastEthernet interfaces
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
239K bytes of non-volatile configuration memory.
62720K bytes of ATA CompactFlash (Read/Write)
Configuration register is 0x2102
.exec_command() terminates SSH session right after execution, you cannot use it to execute multiple commands.
stdin, stdout, stderr are variables for INPUT, OUTPUT and ERRORS.
If we use output = stdout.readline() instead of output = stdout.readlines(), the result would be just the first line:
Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T14, RELEASE SOFTWARE (fc2)
If we use print (output) instead of print (’‘.join(output)), the result would be:
['Cisco IOS Software, 2800 Software (C2800NM-ADVIPSERVICESK9-M), Version 12.4(15)T14, RELEASE SOFTWARE (fc2)\r\n', 'Technical Support: http://www.cisco.com/techsupport\r\n', 'Copyright (c) 1986-2010 by Cisco Systems, Inc.\r\n', 'Compiled Tue 17-Aug-10 09:00 by prod_rel_team\r\n', '\r\n', 'ROM: System Bootstrap, Version 12.4(13r)T, RELEASE SOFTWARE (fc1)\r\n', '\r\n', 'R1 uptime is 1 hour, 44 minutes\r\n', 'System returned to ROM by power-on\r\n', 'System image file is "flash:c2800nm-advipservicesk9-mz.124-15.T14.bin"\r\n', '\r\n', '\r\n', 'This product contains cryptographic features and is subject to United\r\n', 'States and local country laws governing import, export, transfer and\r\n', 'use. Delivery of Cisco cryptographic products does not imply\r\n', 'third-party authority to import, export, distribute or use encryption.\r\n', 'Importers, exporters, distributors and users are responsible for\r\n', 'compliance with U.S. and local country laws. By using this product you\r\n', 'agree to comply with applicable laws and regulations. If you are unable\r\n', 'to comply with U.S. and local laws, return this product immediately.\r\n', '\r\n', 'A summary of U.S. laws governing Cisco cryptographic products may be found at:\r\n', 'http://www.cisco.com/wwl/export/crypto/tool/stqrg.html\r\n', '\r\n', 'If you require further assistance please contact us by sending email to\r\n', 'export@cisco.com.\r\n', '\r\n', 'Cisco 2811 (revision 53.51) with 249856K/12288K bytes of memory.\r\n', 'Processor board ID FHK1223F50J\r\n', '2 FastEthernet interfaces\r\n', '1 Virtual Private Network (VPN) Module\r\n', 'DRAM configuration is 64 bits wide with parity enabled.\r\n', '239K bytes of non-volatile configuration memory.\r\n', '62720K bytes of ATA CompactFlash (Read/Write)\r\n', '\r\n', 'Configuration register is 0x2102\r\n']
If we delete output = stdout.readlines() and change print (’‘.join(output)) to print (stdout), the result would be channel information:
<paramiko.ChannelFile from <paramiko.Channel 0 (open) window=1024 -> <paramiko.Transport at 0x5dddc278 (cipher aes128-cbc, 128 bits) (active; 1 open channel(s))>>>
