SMB Server fix filename offsets (#1831)

Correctly set the NextEntryOffset for the SMBFindFileNamesInfo results
when querying the names of files. The current logic does not set this
value so will be set to 0 making the client believe there are no more
entries in the result if going by the MS-SMB2 logic.

Author: jborean93

impacket/smbserver.py

@@ -502,6 +502,9 @@ def findFirst2(path, fileName, level, searchAttributes, pktFlags=smb.SMB.FLAGS2_
             item['LastAccessTime'] = getSMBTime(atime)
             item['LastWriteDate'] = getSMBDate(mtime)
             item['LastWriteTime'] = getSMBTime(mtime)
+        elif level in [smb.SMB_FIND_FILE_NAMES_INFO, smb2.SMB2_FILE_NAMES_INFO]:
+            padLen = (8 - (len(item) % 8)) % 8
+            item['NextEntryOffset'] = len(item) + padLen
         searchResult.append(item)
 
     # No more files