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#!/usr/bin/env python
"""
Copyright (c) 2006-2025 sqlmap developers (https://sqlmap.org)
See the file 'LICENSE' for copying permission
"""
import hashlib
import os
import sqlite3
import threading
import time
from lib.core.common import getSafeExString
from lib.core.common import serializeObject
from lib.core.common import singleTimeWarnMessage
from lib.core.common import unserializeObject
from lib.core.compat import xrange
from lib.core.convert import getBytes
from lib.core.convert import getUnicode
from lib.core.data import logger
from lib.core.exception import SqlmapConnectionException
from lib.core.settings import HASHDB_END_TRANSACTION_RETRIES
from lib.core.settings import HASHDB_FLUSH_RETRIES
from lib.core.settings import HASHDB_FLUSH_THRESHOLD
from lib.core.settings import HASHDB_RETRIEVE_RETRIES
from lib.core.threads import getCurrentThreadData
from lib.core.threads import getCurrentThreadName
from thirdparty import six
class HashDB(object):
def __init__(self, filepath):
self.filepath = filepath
self._write_cache = {}
self._cache_lock = threading.Lock()
self._connections = []
def _get_cursor(self):
threadData = getCurrentThreadData()
if threadData.hashDBCursor is None:
try:
connection = sqlite3.connect(self.filepath, timeout=3, isolation_level=None)
self._connections.append(connection)
threadData.hashDBCursor = connection.cursor()
threadData.hashDBCursor.execute("CREATE TABLE IF NOT EXISTS storage (id INTEGER PRIMARY KEY, value TEXT)")
connection.commit()
except Exception as ex:
errMsg = "error occurred while opening a session "
errMsg += "file '%s' ('%s')" % (self.filepath, getSafeExString(ex))
raise SqlmapConnectionException(errMsg)
return threadData.hashDBCursor
def _set_cursor(self, cursor):
threadData = getCurrentThreadData()
threadData.hashDBCursor = cursor
cursor = property(_get_cursor, _set_cursor)
def close(self):
threadData = getCurrentThreadData()
try:
if threadData.hashDBCursor:
threadData.hashDBCursor.connection.commit()
threadData.hashDBCursor.close()
threadData.hashDBCursor.connection.close()
threadData.hashDBCursor = None
except:
pass
def closeAll(self):
for connection in self._connections:
try:
connection.commit()
connection.close()
except:
pass
@staticmethod
def hashKey(key):
key = getBytes(key if isinstance(key, six.text_type) else repr(key), errors="xmlcharrefreplace")
retVal = int(hashlib.md5(key).hexdigest(), 16) & 0x7fffffffffffffff # Reference: http://stackoverflow.com/a/4448400
return retVal
def retrieve(self, key, unserialize=False):
retVal = None
if key and (self._write_cache or os.path.isfile(self.filepath)):
hash_ = HashDB.hashKey(key)
retVal = self._write_cache.get(hash_)
if not retVal:
for _ in xrange(HASHDB_RETRIEVE_RETRIES):
try:
for row in self.cursor.execute("SELECT value FROM storage WHERE id=?", (hash_,)):
retVal = row[0]
except (sqlite3.OperationalError, sqlite3.DatabaseError) as ex:
if any(_ in getSafeExString(ex) for _ in ("locked", "no such table")):
warnMsg = "problem occurred while accessing session file '%s' ('%s')" % (self.filepath, getSafeExString(ex))
singleTimeWarnMessage(warnMsg)
elif "Could not decode" in getSafeExString(ex):
break
else:
errMsg = "error occurred while accessing session file '%s' ('%s'). " % (self.filepath, getSafeExString(ex))
errMsg += "If the problem persists please rerun with '--flush-session'"
raise SqlmapConnectionException(errMsg)
else:
break
time.sleep(1)
if retVal and unserialize:
try:
retVal = unserializeObject(retVal)
except:
retVal = None
warnMsg = "error occurred while unserializing value for session key '%s'. " % key
warnMsg += "If the problem persists please rerun with '--flush-session'"
logger.warning(warnMsg)
return retVal
def write(self, key, value, serialize=False):
if key:
hash_ = HashDB.hashKey(key)
self._cache_lock.acquire()
self._write_cache[hash_] = getUnicode(value) if not serialize else serializeObject(value)
self._cache_lock.release()
if getCurrentThreadName() in ('0', "MainThread"):
self.flush()
def flush(self, forced=False):
if not self._write_cache:
return
if not forced and len(self._write_cache) < HASHDB_FLUSH_THRESHOLD:
return
self._cache_lock.acquire()
_ = self._write_cache
self._write_cache = {}
self._cache_lock.release()
try:
self.beginTransaction()
for hash_, value in _.items():
retries = 0
while True:
try:
try:
self.cursor.execute("INSERT INTO storage VALUES (?, ?)", (hash_, value,))
except sqlite3.IntegrityError:
self.cursor.execute("UPDATE storage SET value=? WHERE id=?", (value, hash_,))
except (UnicodeError, OverflowError): # e.g. surrogates not allowed (Issue #3851)
break
except sqlite3.DatabaseError as ex:
if not os.path.exists(self.filepath):
debugMsg = "session file '%s' does not exist" % self.filepath
logger.debug(debugMsg)
break
if retries == 0:
warnMsg = "there has been a problem while writing to "
warnMsg += "the session file ('%s')" % getSafeExString(ex)
logger.warning(warnMsg)
if retries >= HASHDB_FLUSH_RETRIES:
return
else:
retries += 1
time.sleep(1)
else:
break
finally:
self.endTransaction()
def beginTransaction(self):
threadData = getCurrentThreadData()
if not threadData.inTransaction:
try:
self.cursor.execute("BEGIN TRANSACTION")
except:
try:
# Reference: http://stackoverflow.com/a/25245731
self.cursor.close()
except sqlite3.ProgrammingError:
pass
threadData.hashDBCursor = None
self.cursor.execute("BEGIN TRANSACTION")
finally:
threadData.inTransaction = True
def endTransaction(self):
threadData = getCurrentThreadData()
if threadData.inTransaction:
retries = 0
while retries < HASHDB_END_TRANSACTION_RETRIES:
try:
self.cursor.execute("END TRANSACTION")
threadData.inTransaction = False
except sqlite3.OperationalError:
pass
except sqlite3.ProgrammingError:
self.cursor = None
threadData.inTransaction = False
return
else:
return
retries += 1
time.sleep(1)
try:
self.cursor.execute("ROLLBACK TRANSACTION")
except sqlite3.OperationalError:
self.cursor.close()
self.cursor = None
finally:
threadData.inTransaction = False
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