dns.py

import json
import dns.resolver

misperrors = {'error': 'Error'}
mispattributes = {'input': ['hostname', 'domain', 'domain|ip'], 'output': ['ip-src',
                                                                           'ip-dst']}
moduleinfo = {'version': '0.2', 'author': 'Alexandre Dulaunoy',
              'description': 'Simple DNS expansion service to resolve IP address from MISP attributes',
              'module-type': ['expansion', 'hover']}

moduleconfig = ['nameserver']


def handler(q=False):
    if q is False:
        return False
    request = json.loads(q)
    if request.get('hostname'):
        toquery = request['hostname']
    elif request.get('domain'):
        toquery = request['domain']
    elif request.get('domain|ip'):
        toquery = request['domain|ip'].split('|')[0]
    else:
        return False
    r = dns.resolver.Resolver()
    r.timeout = 2
    r.lifetime = 2

    if request.get('config'):
        if request['config'].get('nameserver'):
            nameservers = []
            nameservers.append(request['config'].get('nameserver'))
            r.nameservers = nameservers
    else:
        r.nameservers = ['8.8.8.8']

    try:
        answer = r.query(toquery, 'A')
    except dns.resolver.NXDOMAIN:
        misperrors['error'] = "NXDOMAIN"
        return misperrors
    except dns.exception.Timeout:
        misperrors['error'] = "Timeout"
        return misperrors
    except Exception:
        misperrors['error'] = "DNS resolving error"
        return misperrors

    r = {'results': [{'types': mispattributes['output'],
                      'values':[str(answer[0])]}]}
    return r


def introspection():
    return mispattributes


def version():
    moduleinfo['config'] = moduleconfig
    return moduleinfo