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-rw-r--r--scripts/external_libs/dpkt-1.8.6.2/dpkt/asn1.py121
1 files changed, 121 insertions, 0 deletions
diff --git a/scripts/external_libs/dpkt-1.8.6.2/dpkt/asn1.py b/scripts/external_libs/dpkt-1.8.6.2/dpkt/asn1.py
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+++ b/scripts/external_libs/dpkt-1.8.6.2/dpkt/asn1.py
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+# $Id: asn1.py 23 2006-11-08 15:45:33Z dugsong $
+# -*- coding: utf-8 -*-
+"""Abstract Syntax Notation #1."""
+
+import struct
+import time
+import dpkt
+
+# Type class
+CLASSMASK = 0xc0
+UNIVERSAL = 0x00
+APPLICATION = 0x40
+CONTEXT = 0x80
+PRIVATE = 0xc0
+
+# Constructed (vs. primitive)
+CONSTRUCTED = 0x20
+
+# Universal-class tags
+TAGMASK = 0x1f
+INTEGER = 2
+BIT_STRING = 3 # arbitrary bit string
+OCTET_STRING = 4 # arbitrary octet string
+NULL = 5
+OID = 6 # object identifier
+SEQUENCE = 16 # ordered collection of types
+SET = 17 # unordered collection of types
+PRINT_STRING = 19 # printable string
+T61_STRING = 20 # T.61 (8-bit) character string
+IA5_STRING = 22 # ASCII
+UTC_TIME = 23
+
+
+def utctime(buf):
+ """Convert ASN.1 UTCTime string to UTC float."""
+ yy = int(buf[:2])
+ mn = int(buf[2:4])
+ dd = int(buf[4:6])
+ hh = int(buf[6:8])
+ mm = int(buf[8:10])
+ try:
+ ss = int(buf[10:12])
+ buf = buf[12:]
+ except TypeError:
+ ss = 0
+ buf = buf[10:]
+ if buf[0] == '+':
+ hh -= int(buf[1:3])
+ mm -= int(buf[3:5])
+ elif buf[0] == '-':
+ hh += int(buf[1:3])
+ mm += int(buf[3:5])
+ return time.mktime((2000 + yy, mn, dd, hh, mm, ss, 0, 0, 0))
+
+
+def decode(buf):
+ """Sleazy ASN.1 decoder.
+ Return list of (id, value) tuples from ASN.1 BER/DER encoded buffer.
+ """
+ msg = []
+ while buf:
+ t = ord(buf[0])
+ constructed = t & CONSTRUCTED
+ tag = t & TAGMASK
+ l = ord(buf[1])
+ c = 0
+ if constructed and l == 128:
+ # XXX - constructed, indefinite length
+ msg.append((t, decode(buf[2:])))
+ elif l >= 128:
+ c = l & 127
+ if c == 1:
+ l = ord(buf[2])
+ elif c == 2:
+ l = struct.unpack('>H', buf[2:4])[0]
+ elif c == 3:
+ l = struct.unpack('>I', buf[1:5])[0] & 0xfff
+ c = 2
+ elif c == 4:
+ l = struct.unpack('>I', buf[2:6])[0]
+ else:
+ # XXX - can be up to 127 bytes, but...
+ raise dpkt.UnpackError('excessive long-form ASN.1 length %d' % l)
+
+ # Skip type, length
+ buf = buf[2 + c:]
+
+ # Parse content
+ if constructed:
+ msg.append((t, decode(buf)))
+ elif tag == INTEGER:
+ if l == 0:
+ n = 0
+ elif l == 1:
+ n = ord(buf[0])
+ elif l == 2:
+ n = struct.unpack('>H', buf[:2])[0]
+ elif l == 3:
+ n = struct.unpack('>I', buf[:4])[0] >> 8
+ elif l == 4:
+ n = struct.unpack('>I', buf[:4])[0]
+ else:
+ raise dpkt.UnpackError('excessive integer length > %d bytes' % l)
+ msg.append((t, n))
+ elif tag == UTC_TIME:
+ msg.append((t, utctime(buf[:l])))
+ else:
+ msg.append((t, buf[:l]))
+
+ # Skip content
+ buf = buf[l:]
+ return msg
+
+
+def test_asn1():
+ s = '0\x82\x02Q\x02\x01\x0bc\x82\x02J\x04xcn=Douglas J Song 1, ou=Information Technology Division, ou=Faculty and Staff, ou=People, o=University of Michigan, c=US\n\x01\x00\n\x01\x03\x02\x01\x00\x02\x01\x00\x01\x01\x00\x87\x0bobjectclass0\x82\x01\xb0\x04\rmemberOfGroup\x04\x03acl\x04\x02cn\x04\x05title\x04\rpostalAddress\x04\x0ftelephoneNumber\x04\x04mail\x04\x06member\x04\thomePhone\x04\x11homePostalAddress\x04\x0bobjectClass\x04\x0bdescription\x04\x18facsimileTelephoneNumber\x04\x05pager\x04\x03uid\x04\x0cuserPassword\x04\x08joinable\x04\x10associatedDomain\x04\x05owner\x04\x0erfc822ErrorsTo\x04\x08ErrorsTo\x04\x10rfc822RequestsTo\x04\nRequestsTo\x04\tmoderator\x04\nlabeledURL\x04\nonVacation\x04\x0fvacationMessage\x04\x05drink\x04\x0elastModifiedBy\x04\x10lastModifiedTime\x04\rmodifiersname\x04\x0fmodifytimestamp\x04\x0ccreatorsname\x04\x0fcreatetimestamp'
+ assert (decode(s) == [(48, [(2, 11), (99, [(4, 'cn=Douglas J Song 1, ou=Information Technology Division, ou=Faculty and Staff, ou=People, o=University of Michigan, c=US'), (10, '\x00'), (10, '\x03'), (2, 0), (2, 0), (1, '\x00'), (135, 'objectclass'), (48, [(4, 'memberOfGroup'), (4, 'acl'), (4, 'cn'), (4, 'title'), (4, 'postalAddress'), (4, 'telephoneNumber'), (4, 'mail'), (4, 'member'), (4, 'homePhone'), (4, 'homePostalAddress'), (4, 'objectClass'), (4, 'description'), (4, 'facsimileTelephoneNumber'), (4, 'pager'), (4, 'uid'), (4, 'userPassword'), (4, 'joinable'), (4, 'associatedDomain'), (4, 'owner'), (4, 'rfc822ErrorsTo'), (4, 'ErrorsTo'), (4, 'rfc822RequestsTo'), (4, 'RequestsTo'), (4, 'moderator'), (4, 'labeledURL'), (4, 'onVacation'), (4, 'vacationMessage'), (4, 'drink'), (4, 'lastModifiedBy'), (4, 'lastModifiedTime'), (4, 'modifiersname'), (4, 'modifytimestamp'), (4, 'creatorsname'), (4, 'createtimestamp')])])])])
+
+if __name__ == '__main__':
+ test_asn1()
+ print 'Tests Successful...' \ No newline at end of file