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TempfileProcess.py
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TempfileProcess.py
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# sniffif - Quick setup for sniffing on a network interface
# Copyright (C) 2019-2019 Johannes Bauer
#
# This file is part of sniffif.
#
# sniffif is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; this program is ONLY licensed under
# version 3 of the License, later versions are explicitly excluded.
#
# sniffif is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with sniffif; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Johannes Bauer <JohannesBauer@gmx.de>
import tempfile
import subprocess
import signal
import ctypes
import os
def set_pdeathsig(sig = signal.SIGKILL):
libc = ctypes.CDLL("libc.so.6")
return lambda: libc.prctl(1, sig)
class TempfileProcess():
def __init__(self, uid_gid = None):
self._uid_gid = uid_gid
self._tempfiles = { }
self._proc = None
@property
def proc(self):
return self._proc
def tmpname(self, name):
return self._tempfiles[name].name
def _cmdline(self):
raise NotImplementedError("Need to override this method in child class.")
def _pre_start(self):
pass
def _post_start(self):
pass
def _new_tempfile(self, name, prefix = "tempfile_", suffix = ".tmp", mode = "wb"):
self._tempfiles[name] = tempfile.NamedTemporaryFile(prefix = prefix, suffix = suffix, mode = mode)
if self._uid_gid is not None:
os.chown(self.tmpname(name), self._uid_gid[0], self._uid_gid[1])
return self._tempfiles[name]
def _start(self):
assert(self._proc is None)
self._pre_start()
cmd = self._cmdline()
self._proc = subprocess.Popen(cmd, preexec_fn = lambda: set_pdeathsig(signal.SIGKILL))
self._post_start()
if __name__ == "__main__":
class SleepProcess(TempfileProcess):
def __init__(self, *args, **kwargs):
TempfileProcess.__init__(self, *args, **kwargs)
self._start()
def _pre_start(self):
self._new_tempfile("foo")
def _cmdline(self):
return [ "sleep", "10" ]
x = SleepProcess()
x.proc.wait()