Parsing nmap xml report with python

Question

I am trying to extract some elements from the following XML file (trimmed down nmap output):

<?xml version="1.0"?>
<nmaprun>
<host starttime="1381245200" endtime="1381245316">
    <address addr="192.168.1.5" addrtype="ipv4"/>
    <hostnames>
      <hostname name="host1.example.com" type="PTR"/>
    </hostnames>
    <os>
        <osmatch>
        <osclass type="general purpose" vendor="Linux" osfamily="Linux" osgen="2.6.X" accuracy="100">
          <cpe>cpe:/o:linux:linux_kernel:2.6</cpe>
        </osclass>
      </osmatch>
    </os>
  </host>
</nmaprun>

with the following code:

import xml.etree.ElementTree as ET

d = [
        {'path': 'address', 'el': 'addr'},
        {'path': 'hostnames/hostname', 'el': 'name'},
        {'path': 'os/osmatch/osclass', 'el': 'osfamily'}
]

tree = ET.parse('testnmap.xml')
root = tree.getroot()
for i in root.iter('host'):
        for h in d:
                if i.find(h['path']): print i.find(h['path']).get(h['el'])
                else: print "UNKNOWN ", (h['path'])

The idea being to extract the IP, hostname and OS. The output gives me

UNKNOWN  address
UNKNOWN  hostnames/hostname
Linux

So the innermost path worked (osfamily), while the others (hostname) failed. What should be the proper call to reach them?

Answer 1

I think the problem is the boolean comparison of i.find(h['path']). It checks if that element has children, and it only happens in <osclass>. You have to check if it's null, comparing to None, like:

...
e = i.find(h['path'])
if e is not None: print(e.get(h['el']))
...

It yields:

192.168.1.5
host1.example.com
Linux