* PHP-7.4:
Handle empty password fast path in caching_sha2_password
Handle error response during caching_sha2_password auth
Add support for caching_sha2_password in change user authentication
Fix unix socket check during caching_sha2_password
Support auth switch request during caching sha2 auth
The fact that conn->unix_socket is set does not mean that a Unix
socket is actually in use -- this member is set in a default
configuration.
Instead check whether a unix_socket stream ops is used.
The problem is newer binutils will no longer default to --copy-dt-needed-entries but use --no-copy-dt-needed-entries instead. So all libraries needed *must* be provided.
Workarounds (either one works)
1) Add "-Wl,--copy-dt-needed-entries" to LDFLAGS to bring back the old behavior of the linker
2) Add "-lz" to list of libraries to be added
In "ext/mysqlnd/mysqlnd_protocol_frame_codec.c" when the "zlib.h" header is included should also trigger adding '-lz' to the list of libraries.
When calling free_result_buffers(), also free field metadata and
restore the mempool state to what it was before any allocations
have been made. Remove the mempool save/restore logic for the
inner result set as this is now handled on a higher level.
As of MariaDB 10.0.2, the server reports a fake version number as work-
around for replication issues[1]. We apply the same "fix" as in the
MariaDB client to cater to this.
[1] <c50ee6c23d (diff-5b45fa673c88c06a9651c7906364f592)>
The php_stream_read() and php_stream_write() functions now return
an ssize_t value, with negative results indicating failure. Functions
like fread() and fwrite() will return false in that case.
As a special case, EWOULDBLOCK and EAGAIN on non-blocking streams
should not be regarded as error conditions, and be reported as
successful zero-length reads/writes instead. The handling of EINTR
remains unclear and is internally inconsistent (e.g. some code-paths
will automatically retry on EINTR, while some won't).
I'm landing this now to make sure the stream wrapper ops API changes
make it into 7.4 -- however, if the user-facing changes turn out to
be problematic we have the option of clamping negative returns to
zero in php_stream_read() and php_stream_write() to restore the
old behavior in a relatively non-intrusive manner.
Since mysqlnd is solely developed in the php-src repository, it makes
not much sense to have its own version number, particularly since
nobody cares to update it. Therefore we use PHP's version number, but
stick with the "mysqlnd" prefix which can be important to distinguish
the mysqli driver (libmysqlclient vs. mysqlnd).
Available under -DZEND_TRACK_ARENA_ALLOC. This will use the system
allocator combined with arena checkpointing & release semantics
and allows analyzing arena usage under asan/valgrind.
I've sacrificed the duplicate arena implementation in mysqlnd, as
the integration with mysqlnd alloc is not worth the code duplication
to me.
The actual leak is observed in ext/pdo_mysql/tests/bug_74376.phpt.
The persistent connection leaks because a refcount decrement on a
result is missed. The refcount decrement is missed because
free_result_contents is used, rather than free_result.
Looking at other uses of free_result_contents, it looks like they
could also suffer from this problem. Apart from one case,
free_result_contents is always used to release the result entirely
(I've adjusted the one differing case to only free meta), so I'm
moving most of the logic from free_result into free_result_contents.
The only difference is now that free_result will skip_result first.
Streams will be freed in an unpredictable order during shutdown.
Ignore explicit calls to php_stream_close() entirely to avoid
use-after-free -- instead let the stream resource destructor
deal with it. We have to account for a few special cases:
* Enclosed streams should be freed, as the resource destructor
will forward to the enclosing stream.
* Stream cookies also directly free streams, because we delegate
to the cookie destruction if one exists.
* Mysqlnd also directly frees streams, because it explicitly
removes stream resources (because mysqlnd!)
RFC: https://wiki.php.net/rfc/tostring_exceptions
And convert some object to string conversion related recoverable
fatal errors into Error exceptions.
Improve exception safety of internal code performing string
conversions.
Don't generate explicit warnings for these in two places, use usual
error handling mechanism. Additionally suppress a number of warnings
if the server has gone away.
