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MimeGuesser.py
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MimeGuesser.py
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'''
NFI -- Silensec's Nyuki Forensics Investigator
Copyright (C) 2014 George Nicolaou (george[at]silensec[dot]com)
Silensec Ltd.
This file is part of Nyuki Forensics Investigator (NFI).
NFI is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
NFI is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with NFI. If not, see <http://www.gnu.org/licenses/>.
'''
from FileHandlers import *
import re
class MimeGuesser(object):
gotmagic = True
getfmime = None
meta = {
"sqlite3": {"mime": "application/octet-stream",
"desc": "Sqlite 3.x database", "handler":handler_sqlite },
"bplist": { "handler": handler_bplist },
"xml": { "mime": "application/xml", "handler":handler_xml },
"data": { "handler": handle_data },
"image": { "handler": handle_image },
"text": { "handler": handle_text },
"default": { "handler": handle_data }
}
"""
signatures = {
"sqlite3":"\x53\x51\x4c\x69\x74\x65\x20\x66\x6f\x72\x6d\x61\x74\x20\x33\x00",
"xml":"\x3c\x3f\x78\x6d\x6c\x20",
"jpeg":"\xFF\xD8\xFF"
}
"""
signatures = {
"bplist": "^bplist00"
}
magicsignatures = {
"sqlite3":"SQLite 3.*",
"bplist": "Apple binary property list",
"xml": "XML.*",
"image": "(JPEG|PNG|GIF).*",
"data": "data.*",
"text": "ASCII.*"
}
def localmime_buffer(self, buf):
for key,value in self.signatures.iteritems():
if value.match(buf) != None:
return key
return None
def localmime(self, file):
#XXX write code for the above
return
def magicmime(self, file):
mdescr = self.getfmime(file)
for key in self.magicsignatures.keys():
if self.magicsignatures[key].match(mdescr):
return self.meta[key]
return self.meta["default"]
#return None
def __init__(self):
for key in self.magicsignatures.keys():
self.magicsignatures[key] = re.compile(self.magicsignatures[key])
for key in self.signatures.keys():
self.signatures[key] = re.compile(self.signatures[key])
try:
import magic
self.getfmime = magic.from_file
self.getbmime = magic.from_buffer
except:
print "python-magic is not installed (or wrong version)"
self.gotmagic = False
def get_buffermimetype(self,buf,mime=False):
result = self.getbmime(buf,mime)
if result == 'application/octet-stream':
localres = self.localmime_buffer(buf)
if localres != None:
return localres
return result
def get_filemime(self,filepath,mime=False):
return self.getfmime(filepath,mime)
def get_handler(self, filepath ):
info = self.magicmime(filepath)
if info == None:
#print "\tNO HANDLER FOR: " + filepath
return None
return info["handler"]