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mirror of https://github.com/samba-team/samba.git synced 2025-02-09 09:57:48 +03:00

127 Commits

Author SHA1 Message Date
Volker Lendecke
7c68d88cef lib: Make GUID_to_ndr_buf() return void
The whole point of struct GUID_ndr_buf is that this never fails.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2024-03-12 13:31:31 +00:00
Douglas Bagnall
4face258de ndr: mark invalid pull ndr_flags as unlikely
This might have little effect, but sometimes we see primatives like
ndr_pull_uint32() taking a few percent of the CPU time, and this is in
all those functions.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
BUG: https://bugzilla.samba.org/show_bug.cgi?id=15574
2024-02-08 02:48:44 +00:00
Joseph Sutton
346844b730 librpc: Change type of ‘u16string’ from ‘const uint16_t *’ to ‘const unsigned char *’
A u16string is supposed to contain UTF‐16 code units, but
ndr_pull_u16string() and ndr_push_u16string() fail to correctly ensure
this on big‐endian systems. Code that relies on the u16string array
containing correct values will then fail.

Fix ndr_pull_u16string() and ndr_push_u16string() to work on big‐endian
systems, ensuring that other code can use these strings without having
to worry about first encoding them to little‐endian.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-12-21 23:48:46 +00:00
Joseph Sutton
f94b981e86 pidl: Add new ‘u16string’ type
This type represents a UTF‐16–encoded string. These strings are kept
UTF‐16–encoded rather than converted to the Unix charset to be stored in
memory; this avoids issues regarding NULL termination and conversion
between character sets. We want to be able to handle strings that are
not valid UTF‐16.

Not bumping the NDR ABI version, because there hasn’t been an NDR
release since commit c4f281e9ae36c225b6003e0fa1cb8fb2e67bf543.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-11-20 21:50:32 +00:00
Joseph Sutton
1e029b2cd7 librpc:ndr: Convert NDR flags types to enumerations
Using an enumeration rather than ‘uint32_t’ or ‘uint64_t’ means that
debuggers such as gdb can now associate the flag constants with their
respective types. This means that if you have an instance of these flags
types, the debugger will show you the individual flags that make up the
value rather than an inscrutable integer value.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-11-15 22:07:36 +00:00
Joseph Sutton
2562f24d11 librpc:ndr: Fix comment
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-11-15 22:07:36 +00:00
Joseph Sutton
5b693597b0 libndr:ndr: Allow only one string encoding flag
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-11-15 22:07:36 +00:00
Andrew Bartlett
4decb074d8 librpc/ndr: Add support for LIBNDR_FLAG_STR_NO_EMBEDDED_NUL
This requires that, other than termination, no NUL (\0) codepoints
exist in the input string, because bytes beyon that will be lost
in the output string.

This in turn causes trouble for round-trip testing, so it is easiest
to reject it upfront (on an opt-in basis).

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>
2023-11-13 01:28:36 +00:00
Joseph Sutton
c75be6c326 librpc:ndr: Increase size of ‘libndr_flags’ type to 64 bits
This gives us thirty‐two new LIBNDR_ flags to play with.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-11-01 20:10:45 +00:00
Joseph Sutton
a396b705c8 librpc:ndr: Introduce ‘ndr_flags_type’ type
Instead of ‘int’ or ‘uint32_t’, neither of which convey much meaning,
consistently use a newly added type to hold NDR_ flags.

Update the NDR 4.0.0 ABI.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-11-01 20:10:45 +00:00
Joseph Sutton
c4f281e9ae librpc:ndr: Introduce ‘libndr_flags’ type
The LIBNDR_FLAG_ namespace is getting dangerously full, with only a
single flag value (1 << 9) remaining for use. After that flag is put
into use, we won’t be able to add any new flags without increasing the
flag width to 64‐bit.

Up to now we’ve used a haphazard mix of int, unsigned, and uint32_t to
store these flags. Introduce a new type, ‘libndr_flags’, to be used
consistently to hold LIBNDR flags. If in the future we find we need to
move to 64‐bit flags, this type gives us an opportunity to do that.

Bump the NDR version to 4.0.0 — an major version increment, for we’re
changing the function ABI and adding the new symbol
ndr_print_libndr_flags.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-11-01 20:10:45 +00:00
Volker Lendecke
82a12f7a9a libndr: Factor out ndr_pull_struct_blob_noalloc()
smb3_file_posix_information is variable length with something behind.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
2023-10-04 20:31:36 +00:00
Joseph Sutton
402bb17693 librpc:ndr: Add ‘int64’ type
This type behaves like a signed variant of ‘hyper’. Unlike the existing
‘dlong’ type, which has four byte alignment, ‘int64’ is aligned to eight
bytes.

Bump the NDR version to 3.0.1.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15452

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-08-15 18:46:33 +00:00
Joseph Sutton
44df47712a librpc:ndr: Format sizes as ‘size_t’
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-08-14 04:57:34 +00:00
Joseph Sutton
64834e2668 librpc/ndr: Format NDR pull sizes as ‘size_t’
The arguments to these macros are occasionally of type size_t.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-08-08 04:39:36 +00:00
Andrew Bartlett
327c84cf87 librpc/ndr: Implement lzxpress_huffman() compression in libndr for Kerberos Claims
Rather than just pick the next value we re-arrange compression values
in libndr to be memnonic to values in MS Windows ntifs.h

This helps avoid confusing developers who compare these
algorithms with local the MS Windows interface.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
2023-03-31 01:48:30 +00:00
Andrew Bartlett
c85cadf195 librpc/ndr: Add a "NONE" compression format to libndr
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
2023-03-31 01:48:30 +00:00
Andrew Bartlett
8c58da347c libndr/ndr: Add NDR_COMPRESSION_INVALID
This will help make a mapping from wire-specified compression
algorithms to our available choices safer by allowing an invalid
choice to map to NDR_COMPRESSION_INVALID

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
2023-03-31 01:48:30 +00:00
Andrew Bartlett
937bf4b836 librpc/ndr: Unimplement DRSUAPI_COMPRESSION_TYPE_XPRESS and rename
DRSUAPI_COMPRESSION_TYPE_XPRESS is not MS-XCA nor is it implemented by
lzexpress_compress(), so disconnect from that algorithm.

This avoids someone fixing lzxpress_compress() to work for DRSUAPI
and breaking claims support.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
2023-03-31 01:48:30 +00:00
Pavel Filipenský
7b9f87b877 librpc:ndr: Update ndr_print_debug() and add macro NDR_PRINT_DEBUG_LEVEL
Bumping the ABI to 3.0.0

This is enhancement of NDR_PRINT_DEBUG macro with following new features:

* debug level can be specified (NDR_PRINT_DEBUG always uses level 1)
* the trace header shows the location and function of the caller
  instead of function 'ndr_print_debug', which is not really useful.

Signed-off-by: Pavel Filipenský <pfilipen@redhat.com>
Reviewed-by: Andreas Schneider <asn@samba.org>
2022-07-15 14:25:37 +00:00
Andrew Bartlett
3bc680c1e3 pidl: Avoid leaving array_size NDR tokens around
In many cases these can and should be consumed as soon as
they are used.

This is not a complete fix, we don't clean up the array_size
token after using it split between an NDR_SCALARS and
an NDR_BUFFERS pass, but it is much better than it was
and helps the winbind case with a large number of groups
(eg 100,000) as otherwise we hit the 65535 NDR token limit.

(This is an arbitary Samba-only limit to avoid DoS conditions)

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14710

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
2021-06-02 03:56:36 +00:00
Andrew Bartlett
a7d4f93cfd pidl: Avoid leaving array_length NDR tokens around
In many cases these can and should be consumed as soon as
they are used.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14710

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
2021-06-02 03:56:36 +00:00
Andrew Bartlett
40aabcb5cf librpc: Add const to cookie pointer in ndr_check_array_{size,length}
This pointer is only used to find the right token in the list
so can be declared const.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14710

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
2021-06-02 03:56:36 +00:00
Andrew Bartlett
c35f4180a4 libndr: Return error code from ndr_token_peek()
This makes it safer to change our code to remove tokens after use
if failing to obtain a token would result in an error.

This means changing ndr_get_array_size() and ndr_get_array_length()
to also return an error code.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14710

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
2021-06-02 03:56:36 +00:00
Andreas Schneider
a47fdd9ebb libndr: Use better and more clear check for empty flags
warning: converting the result of '<<' to a boolean always evaluates to true [-Wtautological-constant-compare]

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
2021-02-01 21:50:32 +00:00
Volker Lendecke
a35c8a0ec2 librpc: Add ndr_syntax_id_buf_string()
Same pattern as GUID_buf_string()

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Samuel Cabrero <scabrero@samba.org>
2021-01-28 16:58:35 +00:00
Volker Lendecke
bbb017637e librpc: Add GUID_to_ndr_buf()
Avoids talloc

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
2020-10-02 21:30:33 +00:00
Gary Lockyer
ba518a1deb librpc ndr: add recursion check macros
Add macros to check the recursion depth.

Credit to OSS-Fuzz

REF: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19280
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14254

Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2020-02-27 01:02:32 +00:00
Andreas Schneider
7ab1156b1e librpc:ndr: Remove byteorder.h from libndr.h
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2020-02-21 02:09:33 +00:00
Gary Lockyer
6d05fb3ea7 librpc ndr: NDR_PULL_ALIGN check for unsigned overflow
Handle uint32 overflow in NDR_PULL_ALIGN

Credit to OSS-Fuzz

REF: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20083
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14236

Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2020-02-07 08:53:40 +00:00
Gary Lockyer
ae6927e4f0 librpc ndr: Heap-buffer-overflow in lzxpress_decompress
Reproducer for oss-fuzz Issue 20083

Project: samba
Fuzzing Engine: libFuzzer
Fuzz Target: fuzz_ndr_drsuapi_TYPE_OUT
Job Type: libfuzzer_asan_samba
Platform Id: linux

Crash Type: Heap-buffer-overflow READ 1
Crash Address: 0x6040000002fd
Crash State:
  lzxpress_decompress
    ndr_pull_compression_xpress_chunk
      ndr_pull_compression_start

Sanitizer: address (ASAN)

Recommended Security Severity: Medium

Credit to OSS-Fuzz

REF: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20083
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14236

Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2020-02-07 08:53:40 +00:00
Andrew Bartlett
82aff583b7 libndr: Return enum ndr_err_code from ndr_{pull,push}_steal_switch_value()
This breaks the ABI so we merge this into the unreleased libndr-1.0.0.

The advantage of the new functions is there (except for print, which
is unchanged) is an error raised when the token is not found, so
we can be confident in the changes to the token behaviour.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>

Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Thu Dec 12 03:56:23 UTC 2019 on sn-devel-184
2019-12-12 03:56:23 +00:00
Andrew Bartlett
d30c377d8c librpc/ndr: Remove ndr_{push,pull}_get_switch_value()
By removing this we know we do not need to worry about this list
growing without bounds.  We merge this into the recently created but
not yet released ABI 1.0.0

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
2019-12-12 02:30:41 +00:00
Andrew Bartlett
e08461b284 pidl: Add and use ndr_print_steal_switch_value(), removing ndr_print_get_switch_value()
This avoids really long token lists for switch values
that will not be needed past this point.

The function name is changed to clarify what exactly is being
done here, and the old function is removed to ensure it is
not being used anywhere else.

Merge the removal of ndr_print_get_switch_value into
just-tagged librpc/ABI/ndr-1.0.0.sigs as this
has not been put into any release yet.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
2019-12-12 02:30:40 +00:00
Andrew Bartlett
e1a15710a4 librpc/ndr: Add ndr_push_steal_switch_value()
This will allow generated code to instead push and pop union values onto the
switch_list stack, which is more memory efficient than creating a single large
list to be scannned and eventually discarded.

Merge into unreleased ABI 1.0.0

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13876

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
2019-12-12 02:30:40 +00:00
Andrew Bartlett
42ac80fb46 ndr: Include the caller location in ndr_{pull,push}_error() messages
This should aid in debugging NDR parse failures.

Use the ABI bump to again exclude ndr_table_misc incorrectly
added in ABI 0.2.1.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>

Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Tue Nov 19 14:47:46 UTC 2019 on sn-devel-184
2019-11-19 14:47:46 +00:00
Gary Lockyer
5d67e87d1c pidl: Allow ndrdump to print public structures
Generate code to allow ndrdump to operate on public structures.

Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Pair-Programmed-With: Andrew Bartlett <abartlet@samba.org>
2019-06-06 03:30:18 +00:00
Andreas Schneider
96df6878ed lib:util: Move discard_const(_p) to own header for libndr.h
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13778

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Guenther Deschner <gd@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
2019-02-14 15:59:26 +01:00
Andreas Schneider
666802a3db librpc:ndr: Add NDR_ZERO_STRUCT(P) macros
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13778

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
2019-02-14 15:59:26 +01:00
Andreas Schneider
2a7086f1ac librpc:ndr: Implement ndr_zero_memory()
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13778

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
2019-02-14 15:59:25 +01:00
Andreas Schneider
6f48bc840c librpc:ndr: Fix undefined behavior in ndr.c
librpc/ndr/ndr.c:1430 runtime error: left shift of 1 by 31 places cannot
be represented in type 'int'

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>

Autobuild-User(master): Gary Lockyer <gary@samba.org>
Autobuild-Date(master): Fri Nov 23 01:23:09 CET 2018 on sn-devel-144
2018-11-23 01:23:09 +01:00
Günther Deschner
096efc93df librpc/ndr: add new MSZIP compression type for cabinet files
Guenther

Signed-off-by: Guenther Deschner <gd@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
2017-07-19 21:22:13 +02:00
Aurelien Aptel
aa33aa6e64 librpc/ndr: add new ndr_compression_state
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Guenther Deschner <gd@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
2017-07-19 21:22:13 +02:00
Stefan Metzmacher
32aa3a199d librpc/ndr: add LIBNDR_FLAG_IS_SECRET handling
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12782

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
2017-06-27 16:57:43 +02:00
Stefan Metzmacher
91d8272e86 librpc/ndr: align the definition of LIBNDR_STRING_FLAGS with currently defined flags
The range included the unused (1<<14) before.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12782

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
2017-06-27 16:57:43 +02:00
Douglas Bagnall
70923b7521 ndr: Use resizing array instead of linked lists (breaking ABI)
The ndr token code keeps a temporary store of tokens which are
referred to a small number of times (often once) before being
discarded. The access patterns are somewhat stack-like, with recently
placed tokens being accessed most often.

The old code kept these tokens in a linked list, which we replace with
a self-resizing array.

This keeps everything roughly the same in big-O terms, but makes it
all faster in practice by vastly reducing the amount of tallocing and
pointer-chasing.

The peak memory use is strictly reduced. On a 64 bit machine each core
token struct fits in 16 bytes (after padding) while the two pointers
used by the DLIST add another 16 bytes, so the overall list allocation
is the same as the peak 2n array allocation -- except in the list case
it is dwarfed by the talloc and malloc metadata overhead.

Before settling on the resized arrays, we tried red-black trees, which
are bound to be better for large ndr structures. As it happens, we
don't deal with large structures (the size of replication clumps is
limited to 400 objects) and the asymptotic benefits of the trees are
not realised in practice.

With luck you should find graphs comparing the performance of these
various techniques at:

https://www.samba.org/~dbagnall/perf-tests/ndr-token/

This necessarily breaks the ABI because the linked list implementation
was publicly exposed.

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Thu Mar  2 08:38:22 CET 2017 on sn-devel-144
2017-03-02 08:38:21 +01:00
Douglas Bagnall
4bd8e63165 ndr: fix whitespace in libndr.h, ndr.c
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2017-03-02 04:35:14 +01:00
Günther Deschner
303ae2a023 librpc/ndr: add ndr_push_charset_to_null and increase library version (abi change)
We were crashing earlier when calculating the length of NULL strings in
fixed size arrays (noticed while replying with an empty
spoolss_CorePrinterDriver struct within the spoolss_GetCorePrinterDrivers
call).

Guenther

Signed-off-by: Guenther Deschner <gd@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
2017-01-24 10:53:17 +01:00
Andrew Bartlett
1246904d41 librpc: Add ndr_push_struct_into_fixed_blob() and use it in GUID_to_ndr_blob()
This allows us to allocate only the correct size, not a default of 1024 bytes
per push.

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
2016-07-28 10:06:12 +02:00
Ralph Boehme
df079962ef librpc/ndr: add flag LIBNDR_FLAG_NO_COMPRESSION
This flag can be used to change marshalling behaviour with regard to
compression.

Example: DNS packets make use of so called DNS name compression which
means that for identical strings in a DNS packet, the second string is
replaced with a reference (an offset) to the first.

Setting this flag requests to turns off the marshalling compression.

This will be used in the next commit to prevent name compression in DNS
TSIG records.

Bug: https://bugzilla.samba.org/show_bug.cgi?id=11520

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Garming Sam <garming@catalyst.net.nz>
2016-06-16 00:06:27 +02:00