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All the existing calls are right before returns, so they don't really
matter. But you never know when the code will change, and any compiler
will wipe the NULL assignment.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Noel Power <noel.power@suse.com>
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>
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 c4f281e9ae.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Commit c51795c747 reorganized
ndr_pull_string() so that when we reach this DEBUG(), we don’t yet have
a string to log — ‘as’ will always be NULL. Attempting to log a NULL
string invokes undefined behaviour.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
If the source string doesn’t need to be converted, there’s no reason for
it to be talloc‐allocated.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
This ensures that ‘dest’ gets freed on failure.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
The new name indicates that — contrary to functions such as strnlen() —
the length may include the terminator.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
ndr_pull_string() prohibited this, but ndr_push_string() always masked
STR_NOTERM out. Now the set of allowed flags should be consistent
between the two functions.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
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>
The failure to talloc_strdup("") is just an error and all other cases set the
string or given an error.
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>
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>
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>
We are about to add a new enumeration constant (NUM_CHARSETS) to
charset_t. To do that we must have a default case in this switch
statement, or the compiler will refuse to compile it, stating that we
haven’t handled all the cases.
The alternative, adding a case for NUM_CHARSETS, would just look silly.
Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
convert_string_talloc_handle() tries to play an the safe side
and always returns a null terminated array.
But for NDR we need to be correct on the wire...
BUG: https://bugzilla.samba.org/show_bug.cgi?id=14956
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
The correct line should have been
talloc_realloc(ndr->current_mem_ctx, a, const char *, count + 2);
because if the loop does not increment count on exit (it exits via
break), so count is left pointing at the thing that just got put in.
i.e., if there was one item it is at a[0], count is 0, but we also
need the trailing NULL byte at a[1] and the length is 2. Thus + 2, not
+ 1.
This will not affect ordinary (that is, non-malicious) traffic,
because talloc_realloc will not actually realloc unless it is saving a
kilobyte. Since the allocation grows slowly with the exponent ~1.25,
the actual reallocs will start happening at some point between 512 and
1024 items.
In the example we have, there were 666 pointers, and space for 824 was
allocated.
Rather than doing the +2 realloc, it is simpler to leave it off
altogether; in the common case (<512 items) it is a no-op anyway, and
in the best possible case it reduces the temporary array by 20%.
Credit to OSS-Fuzz.
REF: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=24646
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Before, talloc_realloc() was being called n times for an array of
length n. This could be very expensive on long string arrays since it
is reasonable to assume each realloc moves O(n) bytes.
This addresses at least one OSS-Fuzz bug, making a timing out test case
100 times faster. Credit to OSS-Fuzz.
REF: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=19706
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Noel Power <npower@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
We don't want to leave other parts of the ndr struct hanging off this
string array just because LIBNDR_FLAG_REMAINING is used.
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Noel Power <npower@samba.org>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Without this protection we will spin during decode of a string_array or nstring_array
that is terminated by only a single NUL byte, not two as required by UTF-16.
BUG: https://bugzilla.samba.org/show_bug.cgi?id=13874
Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
The length is in test units, not bytes, and includes terminating
nulls. For 16-bit character sets, the terminating null must be two
bytes.
Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Gary Lockyer <gary@catalyst.net.nz>
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>
The same as ndr_pull_charset(), however only perform character
conversion on bytes prior to and including the null terminator.
Signed-off-by: Jeremy Allison <jra@samba.org>
As discussed in 'CH_DISPLAY and gettext' on the samba-technical list:
http://lists.samba.org/archive/samba-technical/2011-June/078190.html
Setting this to a value other than 'unix charset' does not make sense,
as any system where the filesytem charset does not equal the terminal
charset will already have problems with programs as simple as 'ls'.
It also means that our output could not be pasted as our input in
interactive programs or onto our command line, as we never did
translate in the DISPLAY -> UNIX direction.
The d_printf() calls are retained in case we need to revisit this, and
to support display_set_stderr().
Andrew Bartlett
This is better than doing a strlen() on the string, as that huristic
only worked for ASCII strings.
Andrew Bartlett
Autobuild-User: Andrew Bartlett <abartlet@samba.org>
Autobuild-Date: Wed Jun 1 01:42:22 CEST 2011 on sn-devel-104
Introduce a new flag, LIBNDR_FLAG_STR_RAW8, which indicates that libndr
should not attempt to convert the corresponding byte sequence, and place
the responsibility on the caller to do so later.
This is needed in cases where the string is known to be 8-bit and either
NULL terminated or of known length, but in an unspecified character set.
For example, when pulling PT_STRING8 properties from an exchange server
via libmapi + libndr, the codepage is neither known nor in the control
of the caller, and is determined by subsequent properties requested from
the server. Therefore the client would like to fetch all properties in
one large batch, and convert the resulting strings locally.
This commit also includes some (basic) tests of each of the flags'
respective behaviors with the ndr push/pull string functions, in a new
source4 torture test suite ndr.ndr_string.
Signed-off-by: Sean Finney <seanius@seanius.net>
Reduce the amount of duplicate code in ndr_pull_string by moving the
almost duplicate conversion calls and their corresponding NDR pulls and
checks to a single location. In the place of the removed calls is logic
allowing the conversion to be generalized, and and any specific
pulls/checks that do not apply to the general case.
This is similar to what has already been done in the switch statement
for ndr_push_string.
Signed-off-by: Sean Finney <seanius@seanius.net>
Makes these interfaces much harder to misuse and easier to ensure error
checking.
Autobuild-User: Jeremy Allison <jra@samba.org>
Autobuild-Date: Wed Mar 30 23:59:37 CEST 2011 on sn-devel-104
