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#!/usr/bin/env python
""" This runs a sequence of commands on a remote host using SSH. It runs a
simple system checks such as uptime and free to monitor the state of the remote
host.
./monitor.py [-s server_hostname] [-u username] [-p password]
-s : hostname of the remote server to login to.
-u : username to user for login.
-p : Password to user for login.
Example:
This will print information about the given host:
./monitor.py -s www.example.com -u mylogin -p mypassword
It works like this:
Login via SSH (This is the hardest part).
Run and parse 'uptime'.
Run 'iostat'.
Run 'vmstat'.
Run 'netstat'
Run 'free'.
Exit the remote host.
PEXPECT LICENSE
This license is approved by the OSI and FSF as GPL-compatible.
http://opensource.org/licenses/isc-license.txt
Copyright (c) 2012, Noah Spurrier <noah@noah.org>
PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
"""
import os, sys, time, re, getopt, getpass
import traceback
import pexpect
#
# Some constants.
#
COMMAND_PROMPT = '[#$] ' ### This is way too simple for industrial use -- we will change is ASAP.
TERMINAL_PROMPT = '(?i)terminal type\?'
TERMINAL_TYPE = 'vt100'
# This is the prompt we get if SSH does not have the remote host's public key stored in the cache.
SSH_NEWKEY = '(?i)are you sure you want to continue connecting'
def exit_with_usage():
print globals()['__doc__']
os._exit(1)
def main():
global COMMAND_PROMPT, TERMINAL_PROMPT, TERMINAL_TYPE, SSH_NEWKEY
######################################################################
## Parse the options, arguments, get ready, etc.
######################################################################
try:
optlist, args = getopt.getopt(sys.argv[1:], 'h?s:u:p:', ['help','h','?'])
except Exception, e:
print str(e)
exit_with_usage()
options = dict(optlist)
if len(args) > 1:
exit_with_usage()
if [elem for elem in options if elem in ['-h','--h','-?','--?','--help']]:
print "Help:"
exit_with_usage()
if '-s' in options:
host = options['-s']
else:
host = raw_input('hostname: ')
if '-u' in options:
user = options['-u']
else:
user = raw_input('username: ')
if '-p' in options:
password = options['-p']
else:
password = getpass.getpass('password: ')
#
# Login via SSH
#
child = pexpect.spawn('ssh -l %s %s'%(user, host))
i = child.expect([pexpect.TIMEOUT, SSH_NEWKEY, COMMAND_PROMPT, '(?i)password'])
if i == 0: # Timeout
print 'ERROR! could not login with SSH. Here is what SSH said:'
print child.before, child.after
print str(child)
sys.exit (1)
if i == 1: # In this case SSH does not have the public key cached.
child.sendline ('yes')
child.expect ('(?i)password')
if i == 2:
# This may happen if a public key was setup to automatically login.
# But beware, the COMMAND_PROMPT at this point is very trivial and
# could be fooled by some output in the MOTD or login message.
pass
if i == 3:
child.sendline(password)
# Now we are either at the command prompt or
# the login process is asking for our terminal type.
i = child.expect ([COMMAND_PROMPT, TERMINAL_PROMPT])
if i == 1:
child.sendline (TERMINAL_TYPE)
child.expect (COMMAND_PROMPT)
#
# Set command prompt to something more unique.
#
COMMAND_PROMPT = "\[PEXPECT\]\$ "
child.sendline ("PS1='[PEXPECT]\$ '") # In case of sh-style
i = child.expect ([pexpect.TIMEOUT, COMMAND_PROMPT], timeout=10)
if i == 0:
print "# Couldn't set sh-style prompt -- trying csh-style."
child.sendline ("set prompt='[PEXPECT]\$ '")
i = child.expect ([pexpect.TIMEOUT, COMMAND_PROMPT], timeout=10)
if i == 0:
print "Failed to set command prompt using sh or csh style."
print "Response was:"
print child.before
sys.exit (1)
# Now we should be at the command prompt and ready to run some commands.
print '---------------------------------------'
print 'Report of commands run on remote host.'
print '---------------------------------------'
# Run uname.
child.sendline ('uname -a')
child.expect (COMMAND_PROMPT)
print child.before
if 'linux' in child.before.lower():
LINUX_MODE = 1
else:
LINUX_MODE = 0
# Run and parse 'uptime'.
child.sendline ('uptime')
child.expect('up\s+(.*?),\s+([0-9]+) users?,\s+load averages?: ([0-9]+\.[0-9][0-9]),?\s+([0-9]+\.[0-9][0-9]),?\s+([0-9]+\.[0-9][0-9])')
duration, users, av1, av5, av15 = child.match.groups()
days = '0'
hours = '0'
mins = '0'
if 'day' in duration:
child.match = re.search('([0-9]+)\s+day',duration)
days = str(int(child.match.group(1)))
if ':' in duration:
child.match = re.search('([0-9]+):([0-9]+)',duration)
hours = str(int(child.match.group(1)))
mins = str(int(child.match.group(2)))
if 'min' in duration:
child.match = re.search('([0-9]+)\s+min',duration)
mins = str(int(child.match.group(1)))
print
print 'Uptime: %s days, %s users, %s (1 min), %s (5 min), %s (15 min)' % (
duration, users, av1, av5, av15)
child.expect (COMMAND_PROMPT)
# Run iostat.
child.sendline ('iostat')
child.expect (COMMAND_PROMPT)
print child.before
# Run vmstat.
child.sendline ('vmstat')
child.expect (COMMAND_PROMPT)
print child.before
# Run free.
if LINUX_MODE:
child.sendline ('free') # Linux systems only.
child.expect (COMMAND_PROMPT)
print child.before
# Run df.
child.sendline ('df')
child.expect (COMMAND_PROMPT)
print child.before
# Run lsof.
child.sendline ('lsof')
child.expect (COMMAND_PROMPT)
print child.before
# # Run netstat
# child.sendline ('netstat')
# child.expect (COMMAND_PROMPT)
# print child.before
# # Run MySQL show status.
# child.sendline ('mysql -p -e "SHOW STATUS;"')
# child.expect (PASSWORD_PROMPT_MYSQL)
# child.sendline (password_mysql)
# child.expect (COMMAND_PROMPT)
# print
# print child.before
# Now exit the remote host.
child.sendline ('exit')
index = child.expect([pexpect.EOF, "(?i)there are stopped jobs"])
if index==1:
child.sendline("exit")
child.expect(EOF)
if __name__ == "__main__":
try:
main()
except Exception, e:
print str(e)
traceback.print_exc()
os._exit(1)
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