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authorJelmer Vernooij <jelmer@samba.org>2008-05-25 02:32:21 +0200
committerJelmer Vernooij <jelmer@samba.org>2008-05-25 02:32:21 +0200
commita2446e5f8550582c0d4353bb85874dea17cf1d98 (patch)
tree7037392f58938dca98ad5d89dd00fb3095b67de0 /source4
parent4c1f0641d395e095d46cd0eb9a09055dd07f850b (diff)
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Add initial work for script that uses probing to figure out IDL.
(This used to be commit 4e5687e813e50d0bc8d6314e389d1d7a0be2f8c1)
Diffstat (limited to 'source4')
-rwxr-xr-xsource4/scripting/bin/autoidl.py161
1 files changed, 161 insertions, 0 deletions
diff --git a/source4/scripting/bin/autoidl.py b/source4/scripting/bin/autoidl.py
new file mode 100755
index 0000000000..eed4ba3a80
--- /dev/null
+++ b/source4/scripting/bin/autoidl.py
@@ -0,0 +1,161 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# Unix SMB/CIFS implementation.
+# Copyright © Jelmer Vernooij <jelmer@samba.org> 2008
+#
+# This program 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.
+#
+# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+#
+
+import sys
+
+MAX_OPNUM = 1000
+MAX_BASE_SIZE = 0x1000
+MAX_IFACE_VERSION = 1000
+
+DCERPC_FAULT_OP_RNG_ERROR = 0x1c010002
+DCERPC_FAULT_NDR = 0x6f7
+NT_STATUS_NET_WRITE_FAULT = -1073741614
+
+
+sys.path.insert(0, "bin/python")
+
+from samba.dcerpc import ClientConnection
+
+def find_num_funcs(conn):
+ for i in xrange(MAX_OPNUM):
+ try:
+ conn.request(i, "")
+ except RuntimeError, (num, msg):
+ if num == DCERPC_FAULT_OP_RNG_ERROR:
+ return i
+ raise Exception("More than %d functions" % MAX_OPNUM)
+
+class Function:
+ def __init__(self, conn, opnum):
+ self.conn = conn
+ self.opnum = opnum
+
+ def request(self, data):
+ assert isinstance(data, str)
+ self.conn.request(self.opnum, data)
+
+ def valid_ndr(self, data):
+ try:
+ self.request(data)
+ except RuntimeError, (num, msg):
+ if num == DCERPC_FAULT_NDR:
+ return False
+ return True
+
+ def find_base_request(self, start=""):
+ """Find the smallest possible request that we can do that is
+ valid.
+
+ This generally means sending all zeroes so we get NULL pointers where
+ possible."""
+ # TODO: Don't try with just 0's as there may be switch_is() variables
+ # for which 0 is not a valid value or variables with range() set
+ # See how much input bytes we need
+ for i in range(MAX_BASE_SIZE):
+ data = start + chr(0) * i
+ if self.valid_ndr(data):
+ return data
+ return None
+
+ def check_decision_byte(self, base_request, i):
+ """Check whether the specified byte is a possible "decision" byte,
+ e.g. a byte that is part of a pointer, array size variable or
+ discriminant.
+
+ Note that this function only checks if a byte is definitely a decision
+ byte. It may return False in some cases while the byte is actually
+ a decision byte."""
+ data = list(base_request)
+ data[i] = chr(1)
+ return not self.valid_ndr("".join(data))
+
+ def find_deferrant_data(self, base_request, idx):
+ data = list(base_request)
+ data[idx*4] = chr(1)
+ # Just check that this is a pointer to something non-empty:
+ assert not self.valid_ndr("".join(data))
+
+ newdata = self.find_base_request("".join(data))
+
+ if newdata is None:
+ return None
+
+ assert newdata.startswith(data)
+
+ return newdata[len(data):]
+
+ def find_idl(self):
+ base_request = self.find_base_request()
+
+ if base_request is None:
+ raise Exception("Unable to determine base size for opnum %d" % self.opnum)
+
+ print "\tBase request is %r" % base_request
+
+ decision_byte_map = map(lambda x: self.check_decision_byte(base_request, x), range(len(base_request)))
+
+ print decision_byte_map
+
+ # find pointers
+ possible_pointers = map(all,
+ [decision_byte_map[i*4:(i+1)*4] for i in range(int(len(base_request)/4))])
+ print possible_pointers
+
+ pointer_deferrant_bases = map(
+ lambda x: self.find_deferrant_data(base_request, x) if possible_pointers[x] else None, range(len(possible_pointers)))
+
+ print pointer_deferrant_bases
+
+
+if len(sys.argv) < 3:
+ print "Usage: autoidl <binding> <UUID> [<version>]"
+ sys.exit(1)
+
+(binding, uuid) = sys.argv[1:3]
+if len(sys.argv) == 4:
+ version = sys.argv[3]
+else:
+ version = None
+
+if version is None:
+ for i in range(MAX_IFACE_VERSION):
+ try:
+ conn = ClientConnection(binding, (uuid, i))
+ except RuntimeError, (num, msg):
+ if num == NT_STATUS_NET_WRITE_FAULT:
+ continue
+ raise
+ else:
+ break
+else:
+ conn = ClientConnection(binding, (uuid, version))
+
+print "Figuring out number of connections...",
+num_funcs = find_num_funcs(conn)
+print "%d" % num_funcs
+
+# Figure out the syntax for each one
+for i in range(num_funcs):
+ print "Function %d" % i
+ data = Function(conn, i)
+ try:
+ data.find_idl()
+ except Exception, e:
+ print "Error: %r" % e