ciscolive/automation/services/update-dns-pi.py

#!/usr/bin/env python2
#
# Copyright (c) 2017-2018  Joe Clarke <jclarke@cisco.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.


import requests
from requests.packages.urllib3.exceptions import InsecureRequestWarning

requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
import json
import sys
import re
import CLEUCreds

PI = '10.100.253.22'
DNS_BASE = 'https://dc1-dns.ciscolive.local:8443/web-services/rest/resource/'
DOMAIN = 'ciscolive.local'
CNR_HEADERS = {
    'authorization': CLEUCreds.JCLARKE_BASIC,
    'accept': 'application/json',
    'content-type': 'application/json'
}

PAGE_SIZE = 1000


def get_devs():
    global PI, PAGE_SIZE, DOMAIN

    url = "https://{}/webacs/api/v1/data/Devices.json?.full=true&.maxResults={}".format(
        PI, PAGE_SIZE)
    headers = {
        'Connection': 'close'
    }

    devices = []
    done = False
    first = 0
    while not done:
        code = 401
        i = 0
        nurl = url + "&.firstResult=" + str(first * PAGE_SIZE)
        while code != 200 and i < 10:
            response = requests.request(
                "GET", nurl, auth=(CLEUCreds.PI_USER, CLEUCreds.PI_PASS), headers=headers, verify=False)
            code = response.status_code
            if code != 200:
                i += 1
                time.sleep(3)
        if code == 200:
            j = json.loads(response.text)
            if int(j['queryResponse']['@last']) + 1 == int(j['queryResponse']['@count']):
                done = True
            else:
                first += 1

            for dev in j['queryResponse']['entity']:
                dev_dic = {}
                if 'deviceName' in dev['devicesDTO']:
                    dev_dic['name'] = dev['devicesDTO']['deviceName']
                else:
                    continue
                if not re.search(r'^0', dev_dic['name']):
                    continue
                dev_dic['ip'] = dev['devicesDTO']['ipAddress']
                nparts = dev_dic['name'].split('-')
                if len(nparts) == 3:
                    dev_dic['aliases'] = []
                    dev_dic['name'] = dev_dic['name'].replace(
                        '.{}'.format(DOMAIN), '')
                    dev_dic['aliases'].append('-'.join(nparts[0:2]) + '.{}.'.format(DOMAIN))
                    dev_dic['aliases'].append(nparts[2] + '.{}.'.format(DOMAIN))

                devices.append(dev_dic)

    return devices


def add_entry(url, hname, dev):
    global CNR_HEADERS, DOMAIN

    aliases = []

    if 'aliases' in dev:
        aliases = dev['aliases']

    try:
        host_obj = {
            'addrs': {
                'stringItem': [
                    dev['ip']
                ]
            },
            'aliases': {
                'stringItem': [

                ]
            },
            'name': hname,
            'zoneOrigin': DOMAIN
        }
        for alias in aliases:
            host_obj['aliases']['stringItem'].append(alias)

        response = requests.request(
            'PUT', url, headers=CNR_HEADERS, json=host_obj, verify=False)
        response.raise_for_status()
        print('Added entry for {} ==> {} with aliases {}'.format(
            hname, dev['ip'], str(aliases)))
    except Exception as e:
        sys.stderr.write(
            'Error adding entry for {}: {}\n'.format(hname, e))

if __name__ == '__main__':

    devs = get_devs()
    for dev in devs:
        hname = dev['name'].replace('.{}'.format(DOMAIN), '')
        url = DNS_BASE + 'CCMHost' + '/{}'.format(hname)
        response = requests.request('GET', url, headers=CNR_HEADERS, params={
                                    'zoneOrigin': DOMAIN}, verify=False)
        if response.status_code == 404:
            iurl = DNS_BASE + 'CCMHost'
            response = requests.request('GET', iurl, params={'zoneOrigin': DOMAIN, 'addrs': dev[
                                        'ip'] + '$'}, headers=CNR_HEADERS, verify=False)
            cur_entry = []
            if response.status_code != 404:
                cur_entry = response.json()

            if len(cur_entry) > 0:
                print('Found entry for {}: {}'.format(
                    dev['ip'], response.status_code))
                cur_entry = response.json()
                if len(cur_entry) > 1:
                    print(
                        'ERROR: Found multiple entries for IP {}'.format(dev['ip']))
                    continue

                print('Found old entry for IP {} => {}'.format(
                    dev['ip'], cur_entry[0]['name']))

                durl = DNS_BASE + 'CCMHost' + \
                    '/{}'.format(cur_entry[0]['name'])
                try:
                    response = requests.request('DELETE', durl, params={
                                                'zoneOrigin': DOMAIN}, headers=CNR_HEADERS, verify=False)
                    response.raise_for_status()
                except Exception as e:
                    sys.stderr.write('Failed to delete stale entry for {} ({})\n'.format(
                        cur_entry[0]['name'], dev['ip']))
                    continue

            add_entry(url, hname, dev)
        else:
            cur_entry = response.json()
            create_new = True
            for addr in cur_entry['addrs']['stringItem']:
                if addr == dev['ip']:
                    if 'aliases' in dev and 'aliases' in cur_entry:
                        if (len(dev['aliases']) > 0 and 'stringItem' not in cur_entry['aliases']) or (len(dev['aliases']) != len(cur_entry['aliases']['stringItem'])):
                            break
                        common = set(dev['aliases']) & set(
                            cur_entry['aliases']['stringItem'])
                        if len(common) != len(dev['aliases']):
                            break
                        create_new = False
                        break
                    elif ('aliases' in dev and 'aliases' not in cur_entry) or ('aliases' in cur_entry and 'aliases' not in dev):
                        break
                    else:
                        create_new = False
                        break

            if create_new:
                print('Deleting entry for {}'.format(hname))
                try:
                    response = requests.request('DELETE', url, headers=CNR_HEADERS, params={
                                                'zoneOrigin': DOMAIN}, verify=False)
                    response.raise_for_status()
                except Exception as e:
                    sys.stderr.write(
                        'Error deleting entry for {}: {}\n'.format(hname, e))

                add_entry(url, hname, dev)
            else:
                print('Not creating a new entry for {} as it already exists'.format(
                      dev['name']))