Comments (8)
cytopia
commented on May 22, 2024
It does work on my machine. Can you try to do the same in foreground and see if it somehow quits?
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talau
commented on May 22, 2024
Hmm. In foreground it works. I tried it with Python versions 2.7.18, 3.9.2, and 3.10.8, and it does not work in background.
More info: I tried on Debian Stable (bullseye) and with Debian Unstable.
Running it with nohup (nohup ./bin/pwncat -u -l 127.0.0.1 9999) it shows these exceptions:
------------------------------------>8------------------------------------
Exception in thread STDIN:
Traceback (most recent call last):
File "/usr/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
self.run()
File "/usr/lib/python3.10/threading.py", line 953, in run
self._target(*self._args, **self._kwargs)
File "/git/waiting/pwncat/pwncat/./bin/pwncat", line 4015, in run_action
for data in producer.function(*producer.args, **producer.kwargs):
File "/git/waiting/pwncat/pwncat/./bin/pwncat", line 3423, in producer
data = self.__read_stdin()
File "/git/waiting/pwncat/pwncat/./bin/pwncat", line 3539, in __read_stdin
return sys.stdin.buffer.readline()
OSError: [Errno 9] Bad file descriptor
/git/waiting/pwncat/pwncat/./bin/pwncat:4210: DeprecationWarning: getName() is deprecated, get the name attribute instead
self.__threads[key].getName(),
/git/waiting/pwncat/pwncat/./bin/pwncat:4216: DeprecationWarning: getName() is deprecated, get the name attribute instead
"Joining %s", self.__threads[key].getName()
/git/waiting/pwncat/pwncat/./bin/pwncat:4222: DeprecationWarning: getName() is deprecated, get the name attribute instead
"Joined %s", self.__threads[key].getName()
Exception in thread RECV:
Traceback (most recent call last):
File "/git/waiting/pwncat/pwncat/./bin/pwncat", line 2841, in producer
yield self.__net.receive()
File "/git/waiting/pwncat/pwncat/./bin/pwncat", line 1967, in receive
raise socket.timeout("timed out") # type: ignore
TimeoutError: timed out
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/lib/python3.10/threading.py", line 1016, in _bootstrap_inner
self.run()
File "/usr/lib/python3.10/threading.py", line 953, in run
self._target(*self._args, **self._kwargs)
File "/git/waiting/pwncat/pwncat/./bin/pwncat", line 4015, in run_action
for data in producer.function(*producer.args, **producer.kwargs):
File "/git/waiting/pwncat/pwncat/./bin/pwncat", line 2849, in producer
self.__net.send_eof()
File "/git/waiting/pwncat/pwncat/./bin/pwncat", line 1860, in send_eof
self.__sock.shutdown_send(self.__active["conn"], "conn")
KeyError: 'conn'
------------------------------------8<------------------------------------
Just to let you know, I'm working on Debian packaging [1] of pwncat, and I
discovered this issue during the creation of CI tests.
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1015173
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cytopia
commented on May 22, 2024
Thanks for the details 👍, I will look into this
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cytopia
commented on May 22, 2024
The issue seems to be the stdin file descriptor, when it is not attached to a terminal anymore:
File "/git/waiting/pwncat/pwncat/./bin/pwncat", line 3539, in __read_stdin
return sys.stdin.buffer.readline()
OSError: [Errno 9] Bad file descriptor
This happens both in TCP and also UDP mode as it is not connected to any mode. It is trying to read from stdin, but stdin does not exist.
It can therefore (atm) not put into background mode. I will need to do a little digging if this is possible somehow.
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cytopia
commented on May 22, 2024
I can reproduce it with a very simple script:
test.py:
import sys
print(sys.stdin.readline())And then run it with nohup:
$ nohup python test.py
$ cat nohup.out
Traceback (most recent call last):
File "test.py", line 3, in <module>
print(sys.stdin.readline())
IOError: [Errno 9] Bad file descriptor
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cytopia
commented on May 22, 2024
What you can do for now is the following command for a server:
TCP
nohup ./pwncat -l --no-shutdown 127.0.0.1 9998 > log.log 2>&1
UDP
nohup ./pwncat -l --no-shutdown -u 127.0.0.1 9998 > log.log 2>&1from pwncat.
talau
commented on May 22, 2024
The issue seems to be the stdin file descriptor, when it is not attached to a terminal anymore:
File "/git/waiting/pwncat/pwncat/./bin/pwncat", line 3539, in __read_stdin return sys.stdin.buffer.readline() OSError: [Errno 9] Bad file descriptorThis happens both in TCP and also UDP mode as it is not connected to any mode. It is trying to read from stdin, but stdin does not exist.
It can therefore (atm) not put into background mode. I will need to do a little digging if this is possible somehow.
@cytopia For me, the problem occurs only in UDP mode, TCP runs OK in background mode.
i.e: python3 ./bin/pwncat -l 127.0.0.1 9999 &
(works fine)
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talau
commented on May 22, 2024
@cytopia Hi there! Any news about this issue?
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