Re: xml.sax._exceptions.SAXParseException: scan-2016-02-01.xml:2201:0: no element found

[Daniel Miller <bonsaiviking () gmail com>]

Micah,

It looks like your scan has not finished running. It is in the middle of
NSE scanning (as a result of the -sV in your command line, it is running
all NSE scripts in the "version" category). You should make sure Nmap is
done scanning before you try to compare results with Ndiff.

On the other hand, I see a "Segmentation fault" error just before the
Python traceback. It *might* be possible that Nmap is crashing, leaving an
unfinished XML file. Is there any way you can manually run your scan with
debugging output to determine what if anything might be causing that crash?

Dan

On Tue, Feb 2, 2016 at 9:14 AM, micah anderson <micah () riseup net> wrote:

> Hi,
>
> I'm running nmap (7.01-2 from debian) scans out of cron once a day and
> trying to ndiff the results, but each time I'm getting the same python
> traceback and error.
>
> I'm basically doing this:
>
> /usr/bin/nmap -v --open -sV --datadir /home/nmap/scans  $TARGETS -oA
> scan-$date > /dev/null
>
> and then comparing the scans like this:
>
> /usr/bin/ndiff scan-prev.xml scan-$date.xml > diff-$date
>
> the error I get is this:
>
> Segmentation fault
> Traceback (most recent call last):
>   File "/usr/bin/ndiff", line 85, in <module>
>     sys.exit(ndiff.main())
>   File "/usr/lib/python2.7/dist-packages/ndiff.py", line 1503, in main
>     scan_b.load_from_file(filename_b)
>   File "/usr/lib/python2.7/dist-packages/ndiff.py", line 74, in
> load_from_file
>     self.load(f)
>   File "/usr/lib/python2.7/dist-packages/ndiff.py", line 68, in load
>     parser.parse(f)
>   File "/usr/lib/python2.7/xml/sax/expatreader.py", line 110, in parse
>     xmlreader.IncrementalParser.parse(self, source)
>   File "/usr/lib/python2.7/xml/sax/xmlreader.py", line 125, in parse
>     self.close()
>   File "/usr/lib/python2.7/xml/sax/expatreader.py", line 225, in close
>     self.feed("", isFinal = 1)
>   File "/usr/lib/python2.7/xml/sax/expatreader.py", line 217, in feed
>     self._err_handler.fatalError(exc)
>   File "/usr/lib/python2.7/xml/sax/handler.py", line 38, in fatalError
>     raise exception
> xml.sax._exceptions.SAXParseException: scan-2016-02-01.xml:2201:0: no
> element found
>
> That file (scan-2016-02-01.xml) looks like normal xml, if I run an xml
> validator on it, I'm told: Error: Document ends too soon  in unnamed
> entity at line 2200 char 43 of file, if I go to that line in the file, I
> find this:
>
> ...
> <taskend task="Connect Scan" time="1454367205" extrainfo="39000 total
> ports"/>
> <taskbegin task="Service scan" time="1454367205"/>
> <taskprogress task="Service scan" time="1454367237" percent="28.40"
> remaining="81" etc="1454367318"/>
> <taskprogress task="Service scan" time="1454367273" percent="52.67"
> remaining="62" etc="1454367334"/>
> <taskprogress task="Service scan" time="1454367303" percent="71.60"
> remaining="39" etc="1454367342"/>
> <taskend task="Service scan" time="1454367460" extrainfo="243 services on
> 39 hosts"/>
> <taskbegin task="NSE" time="1454367460"/>
>
> line 2200 is the last line above, the last character on the line ('>')
> is character number 41
>
> thanks for any suggestions or help!
> micah
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