Limnoria/plugins/SupySandbox/plugin.py

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2010-10-17 19:59:13 +02:00
###
# Copyright (c) 2010, Valentin Lorentz
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions, and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions, and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of the author of this software nor the name of
# contributors to this software may be used to endorse or promote products
# derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# pysandbox were originally writen by haypo (under the BSD license),
# and fschfsch by Tila (under the WTFPL license).
###
IN_MAXLEN = 1000 # bytes
OUT_MAXLEN = 1000 # bytes
TIMEOUT = 3 # seconds
EVAL_MAXTIMESECONDS = TIMEOUT
EVAL_MAXMEMORYBYTES = 75 * 1024 * 1024 # 10 MiB
try:
import sandbox as S
except ImportError:
print 'You need pysandbox in order to run fschfsch ' + \
'[http://github.com/haypo/pysandbox].'
raise
import re
import os
import sys
import time
import random
import select
import resource as R
import supybot.utils as utils
from supybot.commands import *
import supybot.plugins as plugins
import supybot.ircutils as ircutils
import supybot.callbacks as callbacks
from cStringIO import StringIO
def createSandboxConfig():
cfg = S.SandboxConfig(
'stdout',
'stderr',
'regex',
'unicodedata', # flow wants u'\{ATOM SYMBOL}' :-)
'future',
'code',
'time',
'datetime',
'math',
'itertools',
'random',
'encodings',
)
cfg.allowModule('sys',
'version', 'hexversion', 'version_info')
return cfg
def _evalPython(line, locals):
locals = dict(locals)
try:
if "\n" in line:
raise SyntaxError()
code = compile(line, "<irc>", "single")
except SyntaxError:
code = compile(line, "<irc>", "exec")
exec code in locals
def evalPython(line, locals=None):
sandbox = S.Sandbox(config=createSandboxConfig())
if locals is not None:
locals = dict(locals)
else:
locals = dict()
try:
sandbox.call(_evalPython, line, locals)
except BaseException, e:
print 'Error: [%s] %s' % (e.__class__.__name__, str(e))
except:
print 'Error: <unknown exception>'
sys.stdout.flush()
def check_output(expr, expected, locals=None):
from cStringIO import StringIO
original_stdout = sys.stdout
try:
output = StringIO()
sys.stdout = output
evalPython(expr, locals)
stdout = output.getvalue()
assert stdout == expected, "%r != %r" % (stdout, expected)
finally:
sys.stdout = original_stdout
def runTests():
# single
check_output('1+1', '2\n')
check_output('1; 2', '1\n2\n')
check_output(
# written in a single line
"prime=lambda n,i=2:"
"False if n%i==0 else prime(n,i+1) if i*i<n else True; "
"prime(17)",
"True\n")
# exec
check_output('def f(): print("hello")\nf()', 'hello\n')
check_output('print 1\nprint 2', '1\n2\n')
check_output('text', "'abc'\n", {'text': 'abc'})
return True
def childProcess(line, w, locals):
# reseed after a fork to avoid generating the same sequence for each child
random.seed()
sys.stdout = sys.stderr = os.fdopen(w, 'w')
R.setrlimit(R.RLIMIT_CPU, (EVAL_MAXTIMESECONDS, EVAL_MAXTIMESECONDS))
R.setrlimit(R.RLIMIT_AS, (EVAL_MAXMEMORYBYTES, EVAL_MAXMEMORYBYTES))
R.setrlimit(R.RLIMIT_NPROC, (0, 0)) # 0 forks
evalPython(line, locals)
def handleChild(childpid, r):
txt = ''
if __import__("__builtin__").any(select.select([r], [], [], TIMEOUT)):
txt = os.read(r, OUT_MAXLEN + 1)
os.close(r)
n = 0
while n < 6:
pid, status = os.waitpid(childpid, os.WNOHANG)
if pid:
break
time.sleep(.5)
n += 1
if not pid:
os.kill(childpid, signal.SIGKILL)
return 'Timeout'
elif os.WIFEXITED(status):
return txt.rstrip()
elif os.WIFSIGNALED(status):
return 'Killed'
def handle_line(line):
r, w = os.pipe()
childpid = os.fork()
if not childpid:
os.close(r)
childProcess(line, w, {})
os._exit(0)
else:
os.close(w)
result = handleChild(childpid, r)
return result
class SupySandbox(callbacks.Plugin):
"""Add the help for "@plugin help SupySandbox" here
This should describe *how* to use this plugin."""
_parser = re.compile(r'(.?sandbox)? (?P<code>.*)')
def sandbox(self, irc, msg, args):
"""<code>
Runs Python code safely thanks to pysandbox"""
code = self._parser.match(msg.args[1]).group('code')
irc.reply(handle_line(code.replace(' $$ ', '\n')))
def runtests(self, irc, msg, args):
irc.reply(runTests())
Class = SupySandbox
# vim:set shiftwidth=4 softtabstop=4 expandtab textwidth=79: