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introducing regex caching mechanism

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This commit is contained in:
Miroslav Stampar
2010-05-21 14:42:59 +00:00
parent 14cab8527e
commit 5d5ebd49b6
4 changed files with 24 additions and 10 deletions
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6
lib/utils/detection.py
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@@ -24,6 +24,7 @@ Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import re, sre_constants
from xml.dom import minidom
from lib.core.common import getCompiledRegex
from lib.core.data import paths
from lib.core.data import logger
@@ -50,12 +51,13 @@ def checkPayload(string):
rules = []
for xmlrule in xmlrules.getElementsByTagName("filter"):
try:
rule = re.compile(xmlrule.getElementsByTagName('rule')[0].childNodes[0].nodeValue)
rule = xmlrule.getElementsByTagName('rule')[0].childNodes[0].nodeValue
desc = __adjustGrammar(xmlrule.getElementsByTagName('description')[0].childNodes[0].nodeValue)
rules.append((rule, desc))
except sre_constants.error: #some issues with some regex expressions in Python 2.5
pass
for rule, desc in rules:
if rule.search(string, re.IGNORECASE):
regObj = getCompiledRegex(rule)
if regObj.search(string, re.IGNORECASE):
logger.warn("highly probable IDS/IPS detection: '%s'" % desc)