Hey All, So maybe this part is important (after doing some troubleshooting) hopefully not everyone has beers in hand already since its Friday :-)
The way the code works if you want to send through the firewall (i.e. SERVER->FIREWALL->SERVER) I split the process into two threads. One is listening on the egress, then I send on the ingress. The main waits until the thread finishes (it times out after 2 seconds). I had to do this b/c scapy (the library I used) won't let me send pcaps while I receive them. This lets me see packets on both sides (i.e. did that sort of internet traffic go through the firewall). The reason I think this could be a problem is when I ran a test where I sent to the firewall (rather than through it) and my program does not need to thread the webserver works fine...... Suggestions anyone? -S -----Original Message----- From: ch...@rebertia.com [mailto:ch...@rebertia.com] On Behalf Of Chris Rebert Sent: Friday, March 02, 2012 3:23 PM To: Sean Cavanaugh (scavanau) Cc: python-list@python.org Subject: Re: Python - CGI-BIN - Apache Timeout Problem On Fri, Mar 2, 2012 at 12:09 PM, Sean Cavanaugh (scavanau) <scava...@cisco.com> wrote: <snip> > THE PROBLEM: > > When I execute the scripts from the command line (#python main.py) it > generates it fine (albeit slowly), it prints all the html code out including > the script. The ‘core’ part of the script dumbed down to the lowest level > is-> > > proc = subprocess.Popen(['/usr/local/bin/python', 'tests.py'], > stdout=subprocess.PIPE) > output = proc.stdout.read() Note the red warning box about possible deadlock with .stdout.read() and friends: http://docs.python.org/library/subprocess.html#popen-objects > print output > proc.stdout.close() As the docs advise, try using .communicate() [http://docs.python.org/library/subprocess.html#subprocess.Popen.communicate ] instead: proc = subprocess.Popen(…) out, err = proc.communicate() print out > When I open main.py and execute the script it just hangs… it seems to > execute the script (I see pcap fires on the interface that I am testing on > the firewall) but its not executing correctly… or loading the entire > webpage…the webpage keeps chugging along and eventually gives me an error > timeout. The hanging makes me suspect that the aforementioned deadlock is occurring. Cheers, Chris -- http://chrisrebert.com -- http://mail.python.org/mailman/listinfo/python-list
