1 files changed, 119 insertions, 0 deletions
diff --git a/scripts/external_libs/dpkt-1.8.6/dpkt/asn1.py b/scripts/external_libs/dpkt-1.8.6/dpkt/asn1.py
new file mode 100644
index 00000000..9a088107
--- /dev/null
+++ b/scripts/external_libs/dpkt-1.8.6/dpkt/asn1.py
@@ -0,0 +1,119 @@
+# $Id: asn1.py 23 2006-11-08 15:45:33Z dugsong $
+
+"""Abstract Syntax Notation #1."""
+
+import struct, 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])
+    mm = 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, mm, 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
+
+if __name__ == '__main__':
+    import unittest
+    
+    class ASN1TestCase(unittest.TestCase):
+        def test_asn1(self):
+            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'
+            self.failUnless(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')])])])])
+
+    unittest.main()