import socket

from iwla import IWLA
from iplugin import IPlugin

#
# Post analysis hook
# 
# Replace IP by reverse DNS names
#
# Plugin requirements :
#     None
#
# Conf values needed :
#     reverse_dns_timeout*
#
# Output files :
#     None
#
# Statistics creation :
#     None
#
# Statistics update :
# valid_visitors:
#    remote_addr
#    dns_name_replaced
#    dns_analyzed
#
# Statistics deletion :
#     None
#

class IWLAPostAnalysisReverseDNS(IPlugin):
    DEFAULT_DNS_TIMEOUT = 0.5

    def __init__(self, iwla):
        super(IWLAPostAnalysisReverseDNS, self).__init__(iwla)
        self.API_VERSION = 1

    def load(self):
        timeout = self.iwla.getConfValue('reverse_dns_timeout',
                                         IWLAPostAnalysisReverseDNS.DEFAULT_DNS_TIMEOUT)
        socket.setdefaulttimeout(timeout)
        return True
        
    def hook(self):
        hits = self.iwla.getValidVisitors()
        for (k, hit) in hits.items():
            if hit.get('dns_analysed', False): continue
            try:
                name, _, _ = socket.gethostbyaddr(k)
                hit['remote_addr'] = name
                hit['dns_name_replaced'] = True
            except:
                pass
            finally:
                hit['dns_analysed'] = True