Newbie: Keep TCP socket open

[Alan Wright]

Hi Folks,
I am newbie to Python, but have successfully created a simple client and
server setup, I have one issue though.

I am trying to test a box by sending many TCP conns (WHILE loop) but not
closing them with a FIN/RST. However, no matter what i do, i cannot get the
loop to stop sending FIN from the client.

Any clues?

Here is my current script

#!/usr/bin/python

import socket,sys
from numpy import *
num1=0

while (num1<=10) :

s = socket.socket(s ocket.AF_INET, socket.SOCK_STR EAM)
s.settimeout(10 .0)
s.connect(("10. 1.1.69", 50008)) # SMTP
print s.recv(1024) + '\n',
num1=num1+1
#s.close()
sys.exit(1)

[Roy Smith]

In article <ia************ *************** ***@pipex.net>,
"Alan Wright" <al*********@vo lubill.comwrote :

Thanks Roy

Any ideas how to code this child process stuff, as I said I am newbie and
not from a coding background

The easiest thing would be to use os.system(). If you wanted to spawn 10
child processes, you could do:

import os
for i in range(10):
os.system ("./child.py &")

and then have child.py be a script that creates 1000 TCP connections.

Keep in mind that one man's stress test is another man's denial of service
attack. If there are any firewalls between you and your target, they may
restrict the number of connections you get to make (or the rate at which
they're created). You may also get a polite phone call from your local IT
people asking enquiring about your activities.

[Alan Wright]

You must have something in your IPtables

I needed to put a rule in to drop these unwanted RST from getting back out.

All fixed now

Thanks for the advice

Alan

"Alan Wright" <al*********@vo lubill.comwrote in message
news:ia******** *************** *******@pipex.n et...

Same on FC8, sends RST after it sees SYN/ACK

"Ghirai" <gh****@ghirai. comwrote in message
news:ma******** *************** *************** *@python.org...

>On Mon, 19 May 2008 23:50:50 +0100
"Alan Wright" <al*********@vo lubill.comwrote :

>>Ghirai,
Scapy does the same, only it sends RST and not FIN, so still no help

send(IP(dst="10 .1.1.2")/TCP(dport=50000 ,flags="S"))

Only have windows at the moment sadly.

Alan

Are you sure there's no firewall or something else between you and the
remote host?

Because i just tried that command with scapy and it didn't send any other
packets
except what it was told (1 packet with SYN flag set).

I haven't tried on windows though.

--
Regards,
Ghirai.

[Alan Wright]

Thanks Roy, will give it a go.

infact there is no need for any IT phone calls, I am the owner of this
network

Very simple [bunch of clients]----[box under test]----[bunch of servers]

Now i should be able to hammer them ;)

Alan

"Roy Smith" <ro*@panix.comw rote in message
news:ro******** *************** @70-1-84-166.area1.spcsd ns.net...

In article <ia************ *************** ***@pipex.net>,
"Alan Wright" <al*********@vo lubill.comwrote :

>Thanks Roy

Any ideas how to code this child process stuff, as I said I am newbie and
not from a coding background

The easiest thing would be to use os.system(). If you wanted to spawn 10
child processes, you could do:

import os
for i in range(10):
os.system ("./child.py &")

and then have child.py be a script that creates 1000 TCP connections.

Keep in mind that one man's stress test is another man's denial of service
attack. If there are any firewalls between you and your target, they may
restrict the number of connections you get to make (or the rate at which
they're created). You may also get a polite phone call from your local IT
people asking enquiring about your activities.

[Roy Smith]

In article <3K************ *********@pipex .net>,
"Alan Wright" <al*********@vo lubill.comwrote :

infact there is no need for any IT phone calls, I am the owner of this
network

That's the best way to do it :-)