Fixes #1794

lib/core/common.py

@@ -1023,15 +1023,18 @@ def getHeader(headers, key):
             break
     return retVal
 
-def checkFile(filename):
+def checkFile(filename, raiseOnError=True):
     """
     Checks for file existence and readability
     """
 
     valid = True
 
+    try:
         if filename is None or not os.path.isfile(filename):
             valid = False
+    except UnicodeError:
+        valid = False
 
     if valid:
         try:
@@ -1040,9 +1043,11 @@ def checkFile(filename):
         except:
             valid = False
 
-    if not valid:
+    if not valid and raiseOnError:
         raise SqlmapSystemException("unable to read file '%s'" % filename)
 
+    return valid
+
 def banner():
     """
     This function prints sqlmap banner with its version

lib/core/dump.py

@@ -13,6 +13,7 @@ import tempfile
 import threading
 
 from lib.core.common import Backend
+from lib.core.common import checkFile
 from lib.core.common import dataToDumpFile
 from lib.core.common import dataToStdout
 from lib.core.common import getSafeExString
@@ -434,7 +435,7 @@ class Dump(object):
                             dumpDbPath = tempDir
 
             dumpFileName = os.path.join(dumpDbPath, "%s.%s" % (unsafeSQLIdentificatorNaming(table), conf.dumpFormat.lower()))
-            if not os.path.isfile(dumpFileName):
+            if not checkFile(dumpFileName, False):
                 try:
                     openFile(dumpFileName, "w+b").close()
                 except SqlmapSystemException:
@@ -449,7 +450,7 @@ class Dump(object):
                     else:
                         dumpFileName = os.path.join(dumpDbPath, "%s.%s" % (_, conf.dumpFormat.lower()))
 
-            appendToFile = os.path.isfile(dumpFileName) and any((conf.limitStart, conf.limitStop))
+            appendToFile = any((conf.limitStart, conf.limitStop)) and checkFile(dumpFileName, False)
             dumpFP = openFile(dumpFileName, "wb" if not appendToFile else "ab", buffering=DUMP_FILE_BUFFER_SIZE)
 
         count = int(tableValues["__infos__"]["count"])

lib/core/settings.py

@@ -20,7 +20,7 @@ from lib.core.enums import OS
 from lib.core.revision import getRevisionNumber
 
 # sqlmap version (<major>.<minor>.<month>.<monthly commit>)
-VERSION = "1.0.3.10"
+VERSION = "1.0.3.11"
 REVISION = getRevisionNumber()
 STABLE = VERSION.count('.') <= 2
 VERSION_STRING = "sqlmap/%s#%s" % (VERSION, "stable" if STABLE else "dev")