Red Hat Bugzilla – Bug 608274
IndexError: string index out of range
Last modified: 2011-06-27 14:58:18 EDT
Description of problem:
Trying to compare two pcap files and I get the following error:
Traceback (most recent call last):
File "/usr/bin/pcapdiff", line 5, in <module>
File "/usr/share/pcapdiff/pcapdiff.py", line 263, in <module>
next['remote'] = get_packet(pcap_remote)
File "/usr/share/pcapdiff/pcapdiff.py", line 152, in get_packet
spacket = parse_and_save(packet)
File "/usr/share/pcapdiff/pcapdiff_helper.py", line 89, in parse_and_save
spacket['ip_total_length'] = 256*ord(ip_packet)+ord(ip_packet)
IndexError: string index out of range
Version-Release number of selected component (if applicable):
'uname -a' is:
Linux jhorne 126.96.36.199-124.fc13.x86_64 #1 SMP Fri Jun 11 09:38:12 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux
Occurs every time with the 2 pcap files I have.
Steps to Reproduce:
See error above.
No errors should be output.
Would you mind attaching the two files?
I can, but they are 12MB and 54MB in size respectively. Do you really want me to attach them?
Do you have any webspace you can put them on briefly? Or do the files possibly contain anything sensitive? If not, see if BZ will let you attach them. Not sure what the limit is.
Created attachment 431820 [details]
First compressed pcap file.
Created attachment 431823 [details]
Second compressed pcap file.
Okay, both files should now be attached.
Sorry for the delay, which is local and which is remote, and what were the IPs for each?
First attachment (tcpdump file) is 'local'. Its IP address is 188.8.131.52. The remote IP address is 184.108.40.206.
Interesting. From everything I can figure, I wonder if there isn't a problem with one of the files. The error makes it look like there's a chunk missing from a packet and it's not handling it gracefully. Can you produce another set of dumps that crash pcapdiff?
No, not really. This was 6 months ago when we were trying to resolve a particular problem. Things have now moved on: the problem was resolved (I gather), and one of the servers involved now performs a different function. So not really possible to get any other dumps from them.
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