update code and file name

Author: sydasif

pexpect/01_telnet_show_version.py

@@ -0,0 +1,20 @@
+import pexpect
+
+# Start a telnet session to the Cisco device
+child = pexpect.spawn("telnet 172.16.141.11")
+child.expect("Username: ")
+child.sendline("admin")
+child.expect("Password: ")
+child.sendline("cisco")
+child.expect("#")  # Wait for the device prompt
+
+# Send the command to show the version
+child.sendline("show version | i V")
+child.expect("#")  # Wait for the prompt after the command
+
+# Convert the output to a string and print it
+show_output = child.before.decode("utf-8")
+print(show_output)
+
+# Exit the session
+child.sendline("exit")

pexpect/02_ssh_show_version.py

@@ -0,0 +1,24 @@
+import pexpect
+
+# Start an SSH session to the Cisco device
+child = pexpect.spawn("ssh admin@192.168.100.20")
+child.expect("Password: ")
+child.sendline("cisco")
+child.expect("SW1>")  # Expect the user mode prompt
+
+# Enter privileged mode
+child.sendline("enable")
+child.expect("Password: ")
+child.sendline("cisco")
+child.expect("S1#")  # Expect the privileged mode prompt
+
+# Send command to show version
+child.sendline("show version | i V")
+child.expect("S1#")  # Wait for the prompt after the command
+
+# Convert the output to a string and print it
+show_output = child.before.decode("utf-8")
+print(show_output)
+
+# Exit the session
+child.sendline("exit")

pexpect/03_telnet_multidevice_script.py

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+# Telnet to Device
+import pexpect
+
+# Define devices with their prompts and IP addresses
+devices = {
+    "CoreSW": {"ip": "192.168.100.20"},
+    "SW1": {"ip": "192.168.100.21"},
+}
+
+# Credentials for login
+username = "admin"
+password = "cisco"
+
+# Loop through each device in the devices dictionary
+for device in devices.keys():
+    ip_address = devices[device]["ip"]
+
+    # Start a telnet session to the device
+    child = pexpect.spawn("telnet " + ip_address)
+
+    # Login process
+    child.expect("Username: ")
+    child.sendline(username)
+    child.expect("Password: ")
+    child.sendline(password)
+
+    # Expect the user EXEC prompt
+    child.expect(">")
+
+    # Enter privileged mode
+    child.sendline("enable")
+    child.expect("Password: ")
+    child.sendline(password)  # Optional if the user has privilege level 15
+    child.expect("#")  # Expect the privileged EXEC prompt
+
+    # Send command to show version
+    child.sendline("show version | i V")
+    child.expect("#")  # Wait for the prompt after the command
+
+    # Retrieve and print the output
+    show_output = child.before.decode("utf-8")
+    print(f"Output from {device}:\n{show_output}")
+
+    # Exit the session
+    child.sendline("exit")

pexpect/04_ssh_multidevice_script.py

@@ -0,0 +1,42 @@
+# SSH to Devices
+import pexpect
+
+# Define devices with their IP addresses
+devices = {
+    "CoreSW": {"ip": "192.168.100.20"},
+    "SW1": {"ip": "192.168.100.21"},
+}
+
+username = "admin"
+password = "cisco"
+
+# Loop through each device
+for device in devices.keys():
+    ip_address = devices[device]["ip"]
+
+    # Start an SSH session to the device
+    child = pexpect.spawn("ssh " + username + "@" + ip_address)
+
+    # Login process
+    child.expect("Password: ")
+    child.sendline(password)
+
+    # Expect the user EXEC prompt
+    child.expect(">")  # User mode prompt
+
+    # Enter privileged mode
+    child.sendline("enable")
+    child.expect("Password: ")
+    child.sendline(password)  # Optional if the user has privilege level 15
+    child.expect("#")  # Privileged mode prompt
+
+    # Send command to show version
+    child.sendline("show version | i V")
+    child.expect("#")  # Wait for the prompt after the command
+
+    # Retrieve and print the output
+    show_output = child.before.decode("utf-8")
+    print(f"Output from {device}:\n{show_output}")
+
+    # Exit the session
+    child.sendline("exit")

pexpect/05_device_config_backup.py

@@ -0,0 +1,50 @@
+#!/usr/bin/env python
+# For SSH create user with privilege level 15
+import getpass
+from pexpect import pxssh
+
+# Define devices and their details
+devices = {
+    "S1": {"ip": "172.16.141.11"},
+    "R1": {"ip": "172.16.141.12"},
+}
+
+# Commands to execute on each device
+commands = ["term length 0", "show run"]
+
+# Get credentials from the user
+username = input("Username: ")
+password = getpass.getpass("Password: ")
+
+# Loop through devices and backup configurations
+for device in devices.keys():
+    outputFileName = device + "_output.cfg"
+    device_ip = devices[device]["ip"]
+
+    # Initialize the SSH session
+    child = pxssh.pxssh()
+    # Manually specify the prompt to expect from the device (e.g., "#")
+    child.PROMPT = r"[#>]"
+
+    # Attempt to login with the specified prompt pattern
+    child.login(
+        device_ip,
+        username.strip(),
+        password.strip(),
+        auto_prompt_reset=False,  # Do not attempt to auto-set the prompt
+    )
+    print(f"Backing up configuration for device: {device}")
+
+    # Open the output file for writing
+    with open(outputFileName, "wb") as f:
+        # Loop through each command and write the output
+        for command in commands:
+            child.sendline(command)
+            # Wait for the specified prompt to appear again
+            child.expect(child.PROMPT)
+            f.write(child.before)  # Write the command output to the file
+
+    # Logout from the device
+    child.logout()
+
+print("Backup process complete.")

pexpect/06_telnet_version_logging.py

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+import sys
+import pexpect
+
+# Start Telnet session to the device
+child = pexpect.spawn("telnet 192.168.100.20")
+
+# Login process
+child.expect("Username: ")  # Wait for the username prompt
+child.sendline("admin")  # Send the username
+child.expect("Password: ")  # Wait for the password prompt
+child.sendline("cisco")  # Send the password
+
+# Expect the device prompt after login
+child.expect("CoreSW#")
+
+# Open log file to write the output
+with open("debug", "wb") as log_file:
+    # Function to log output to both console and file
+    def log_output(data):
+        log_file.write(data)  # Write output to log file
+        sys.stdout.buffer.write(data)  # Write output to console
+
+    # Command to execute on the device
+    command = "show version | i V"
+    child.sendline(command)  # Send the command to the device
+
+    # Expect the prompt after the command execution
+    child.expect("CoreSW#")
+
+    # Get command output
+    output = child.before  # Store the output received before the prompt
+    log_output(output)  # Log output to file and console
+
+# Exit the Telnet session
+child.sendline("exit")  # Send exit command to close the session