#!/usr/bin/env python
# vim:ts=2:et:sw=2:ai
#
# Check configs with remote addresses
#
# Rick van der Zwet <info@rickvanderzwet.nl>
#
import argparse
import gformat
import getpass
import netsnmp
import os
import paramiko
import socket
import sys
import time

SSHPASS = None
netsnmp.verbose = 0

class CmdError(Exception):
  pass

def check_host(hostname):
  cmd = "cat /etc/board.info"
  
  ssh = paramiko.SSHClient()
  ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
  ssh.connect(hostname, username='root', password=SSHPASS,timeout=3)
  stdin, stdout, stderr = ssh.exec_command(cmd)
  stdout = stdout.readlines()
  stderr = stderr.readlines()
  ssh.close()
  if stderr: 
    raise CmdError(stderr)
 
  return dict(map(lambda x: x.strip().split('='),stdout))

def get_bridge_type(host):
  """ Both NS and NS Mx uses a slighly different OID"""
  var_list = netsnmp.VarList(
   *map(lambda x: netsnmp.Varbind(x), 
    ['.1.2.840.10036.3.1.2.1.3.6', '.1.2.840.10036.3.1.2.1.3.7']))
  
  sess = netsnmp.Session(Version=1, DestHost=host, Community='public', Timeout=2 * 100000, Retries=1)
  retval = sess.get(var_list)
  if sess.ErrorInd < 0:
    raise CmdError('SNMP Failed -- [%(ErrorInd)s] %(ErrorStr)s (%(DestHost)s)' % vars(sess))
  return filter(None, retval)[0]



def update_hosts(filters=[]):
  for host in gformat.get_hostlist():
    if filters and not any([f.lower() in host.lower() for f in filters]):
      continue

    print "# Processing host", host
    datadump = gformat.get_yaml(host)
    for iface_key in datadump['autogen_iface_keys']:
      ifacedump = datadump[iface_key]
      if ifacedump.has_key('ns_ip') and ifacedump['ns_ip']:
        addr = ifacedump['ns_ip'].split('/')[0]
        print "## Bridge IP: %(ns_ip)s at %(interface)s" % ifacedump
        try:
          socket.create_connection((addr,80),2)
          bridge_type = get_bridge_type(addr)
          datadump[iface_key]['bridge_type'] = bridge_type
        except (socket.timeout, socket.error) as e:
          print "### %s (%s)" % (e, addr)
        except paramiko.AuthenticationException:
          print "### Conection failed (invalid username/password)"
        except CmdError, e: 
          print "### Command error: %s" % e
    gformat.store_yaml(datadump)
        

def make_output(stdout, stderr):
  def p(prefix, lines):
    return ''.join(["#%s: %s" % (prefix, line) for line in lines])
  output = p('STDOUT', stdout)
  output += p('STDERR', stderr)
  return output

def ubnt_snmp(hostname):
  lines = """\
snmp.community=public
snmp.contact=beheer@lijst.wirelessleiden.nl
snmp.location=WL
snmp.status=enabled\
"""
  cmd = 'mca-config get /tmp/get.cfg && grep -v snmp /tmp/get.cfg > /tmp/new.cfg && echo "%s" >> /tmp/new.cfg \
    && mca-config activate /tmp/new.cfg 1>/dev/null 2>/dev/null && echo "ALL DONE"' % lines
  ssh = paramiko.SSHClient()
  ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
  ssh.connect(hostname, username='root', password=SSHPASS,timeout=3)
  stdin, stdout, stderr = ssh.exec_command(cmd)
  stdout = stdout.readlines()
  stderr = stderr.readlines()
  print make_output(stdout, stderr)
  ssh.close()

def ubnt_keys(hostname):
  keys = open(os.path.join(gformat.NODE_DIR,'global_keys'),'r').read()
  ssh = paramiko.SSHClient()
  ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
  ssh.connect(hostname, username='root', password=SSHPASS,timeout=3)
  cmd = 'test -d .ssh || mkdir .ssh;\
    cat > .ssh/authorized_keys && \
    chmod 0700 .ssh && \
    chmod 0755 . && cfgmtd -p /etc -w'
  stdin, stdout, stderr = ssh.exec_command(cmd)
  stdin.write(keys)
  stdin.flush()
  stdin.channel.shutdown_write()
  stdout = stdout.readlines()
  stderr = stderr.readlines()
  print make_output(stdout, stderr)
  ssh.close()

if __name__ == '__main__':
  # create the top-level parser
  parser = argparse.ArgumentParser(prog='Various WL management tools')
  parser.add_argument('--ask-pass', dest="ask_pass", action='store_true', help='Ask password if SSHPASS is not found')
  subparsers = parser.add_subparsers(help='sub-command help')
  
  parser_snmp = subparsers.add_parser('snmp', help='enable SNMP on UBNT')
  parser_snmp.add_argument('host',type=str)
  parser_snmp.set_defaults(func='snmp')
  
  parser_keys = subparsers.add_parser('keys', help='add ssh keys on UBNT')
  parser_keys.add_argument('host', type=str)
  parser_keys.set_defaults(func='keys')

  parser_update = subparsers.add_parser('update', help='process all UBNT')
  parser_update.add_argument('filters', default=None, nargs='*', type=str)
  parser_update.set_defaults(func='update')
  
  args = parser.parse_args()

  try:
    SSHPASS = os.environ['SSHPASS']
  except KeyError:
    print "#WARN: SSHPASS environ variable not found"
    if args.ask_pass:
      SSHPASS = getpass.getpass("WL root password: ")


  if args.func == 'keys':
    ubnt_keys(args.host)
  elif args.func == 'snmp':
    ubnt_snmp(args.host)
  elif args.func == 'update':
    update_hosts(args.filters)