Created
September 19, 2017 00:45
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SSH to a device in NSO's device list
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#!/usr/bin/env python | |
import socket | |
import sys | |
import tty | |
import termios | |
import paramiko | |
from paramiko.py3compat import u | |
import ncs | |
from _ncs import decrypt | |
debug = False | |
def get_credentials(root, device): | |
authgrp = root.ncs__devices.authgroups.group[device.authgroup].default_map | |
return (device.address, authgrp.remote_name, decrypt(authgrp.remote_password)) | |
class IgnoreMissingHostKeyPolicy(paramiko.MissingHostKeyPolicy): | |
def missing_host_key(self, client, hostname, key): | |
return | |
def main(): | |
with ncs.maapi.Maapi() as m: | |
m.install_crypto_keys() | |
with ncs.maapi.Session(m, 'admin', 'ssh-context'): | |
with m.start_read_trans() as t: | |
root = ncs.maagic.get_root(t) | |
while True: | |
print("q: exit") | |
print("d: enable paramiko debug") | |
devs = [] | |
for device in root.ncs__devices.device: | |
devs.append(device) | |
for (idx, dev) in enumerate(devs): | |
print("{}: {}".format(idx, dev.name)) | |
inp = input('# ') | |
if inp == 'q': | |
break | |
if inp == 'd': | |
print("enabling debug") | |
paramiko.common.logging.basicConfig(level=paramiko.common.DEBUG) | |
try: | |
idx = int(inp) | |
if (idx >= 0) and (idx < len(devs)): | |
ssh_to(root, devs[idx]) | |
except ValueError: | |
pass | |
def ssh_to(root, device): | |
(host, user, pwd) = get_credentials(root, device) | |
ssh = paramiko.SSHClient() | |
ssh.set_missing_host_key_policy(IgnoreMissingHostKeyPolicy()) | |
ssh.connect(host, username=user, password=pwd, allow_agent=False, look_for_keys=False) | |
chan = ssh.invoke_shell() | |
interactive_shell(chan) | |
ssh.close() | |
def interactive_shell(chan): | |
import select | |
oldtty = termios.tcgetattr(sys.stdin) | |
try: | |
tty.setraw(sys.stdin.fileno()) | |
tty.setcbreak(sys.stdin.fileno()) | |
chan.settimeout(0.0) | |
while True: | |
read, _, _ = select.select([chan, sys.stdin], [], []) | |
if chan in read: | |
try: | |
data = u(chan.recv(1024)) | |
if not data: | |
sys.stdout.write('\r\n*** EOF\r\n') | |
break | |
sys.stdout.write(data) | |
sys.stdout.flush() | |
except socket.timeout: | |
pass | |
if sys.stdin in read: | |
data = sys.stdin.read(1) | |
if not data: | |
break | |
chan.send(data) | |
finally: | |
termios.tcsetattr(sys.stdin, termios.TCSADRAIN, oldtty) | |
if __name__ == "__main__": | |
main() |
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