Commit Graph

130 Commits

Author SHA1 Message Date
Marc-André Lureau 7fcfd45666 meson: convert io directory to Meson
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-08-21 06:30:16 -04:00
Paolo Bonzini 243af0225a trace: switch position of headers to what Meson requires
Meson doesn't enjoy the same flexibility we have with Make in choosing
the include path.  In particular the tracing headers are using
$(build_root)/$(<D).

In order to keep the include directives unchanged,
the simplest solution is to generate headers with patterns like
"trace/trace-audio.h" and place forwarding headers in the source tree
such that for example "audio/trace.h" includes "trace/trace-audio.h".

This patch is too ugly to be applied to the Makefiles now.  It's only
a way to separate the changes to the tracing header files from the
Meson rewrite of the tracing logic.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-08-21 06:18:24 -04:00
Philippe Mathieu-Daudé 78f8d4975c io/task: Move 'qom/object.h' header to source
We need "qom/object.h" to call object_ref()/object_unref(),
and to test the TYPE_DUMMY.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20200504115656.6045-3-f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-06-10 12:09:37 -04:00
Markus Armbruster fdceb4ab4d io: Fix qio_channel_socket_close() error handling
The Error ** argument must be NULL, &error_abort, &error_fatal, or a
pointer to a variable containing NULL.  Passing an argument of the
latter kind twice without clearing it in between is wrong: if the
first call sets an error, it no longer points to NULL for the second
call.

qio_channel_socket_close() passes @errp first to
socket_listen_cleanup(), and then, if closesocket() fails, to
error_setg_errno().  If socket_listen_cleanup() failed, this will trip
the assertion in error_setv().

Fix by ignoring a second error.

Fixes: 73564c407c
Cc: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200422130719.28225-11-armbru@redhat.com>
2020-04-29 08:01:52 +02:00
Yu-Chen Lin c64e1e7538 io/channel-websock: treat 'binary' and no sub-protocol as the same
noVNC doesn't use 'binary' protocol by default after
commit c912230309806aacbae4295faf7ad6406da97617.

It will cause qemu return 400 when handshaking.

To overcome this problem and remain compatibility of
older noVNC client.

We treat 'binary' and no sub-protocol as the same
so that we can support different version of noVNC
client.

Tested on noVNC before c912230 and after c912230.

Buglink: https://bugs.launchpad.net/qemu/+bug/1849644

Signed-off-by: Yu-Chen Lin <npes87184@gmail.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2020-02-07 12:22:18 +00:00
Juan Quintela fc8135c630 socket: Add num connections to qio_net_listener_open_sync()
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
2019-09-03 23:24:42 +02:00
Juan Quintela 7959e29ea0 socket: Add num connections to qio_channel_socket_async()
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
2019-09-03 23:24:42 +02:00
Juan Quintela 4e2d8bf6f1 socket: Add num connections to qio_channel_socket_sync()
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
2019-09-03 23:24:42 +02:00
Juan Quintela e5b6353cf2 socket: Add backlog parameter to socket_listen
Current parameter was always one.  We continue with that value for now
in all callers.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
---
Moved trace to socket_listen
2019-09-03 23:24:42 +02:00
Alberto Garcia b65cb867cc main-loop: Fix GSource leak in qio_task_thread_worker()
After g_source_attach() the GMainContext holds a reference to the
GSource, so the caller does not need to keep it.

qio_task_thread_worker() is not releasing its reference so the GSource
is being leaked since a17536c594.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <1565625509-404969-2-git-send-email-andrey.shinkevich@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2019-08-21 16:31:58 +02:00
Markus Armbruster a8d2532645 Include qemu-common.h exactly where needed
No header includes qemu-common.h after this commit, as prescribed by
qemu-common.h's file comment.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190523143508.25387-5-armbru@redhat.com>
[Rebased with conflicts resolved automatically, except for
include/hw/arm/xlnx-zynqmp.h hw/arm/nrf51_soc.c hw/arm/msf2-soc.c
block/qcow2-refcount.c block/qcow2-cluster.c block/qcow2-cache.c
target/arm/cpu.h target/lm32/cpu.h target/m68k/cpu.h target/mips/cpu.h
target/moxie/cpu.h target/nios2/cpu.h target/openrisc/cpu.h
target/riscv/cpu.h target/tilegx/cpu.h target/tricore/cpu.h
target/unicore32/cpu.h target/xtensa/cpu.h; bsd-user/main.c and
net/tap-bsd.c fixed up]
2019-06-12 13:20:20 +02:00
Markus Armbruster 0b8fa32f55 Include qemu/module.h where needed, drop it from qemu-common.h
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20190523143508.25387-4-armbru@redhat.com>
[Rebased with conflicts resolved automatically, except for
hw/usb/dev-hub.c hw/misc/exynos4210_rng.c hw/misc/bcm2835_rng.c
hw/misc/aspeed_scu.c hw/display/virtio-vga.c hw/arm/stm32f205_soc.c;
ui/cocoa.m fixed up]
2019-06-12 13:18:33 +02:00
Markus Armbruster 500016e5db trace-events: Shorten file names in comments
We spell out sub/dir/ in sub/dir/trace-events' comments pointing to
source files.  That's because when trace-events got split up, the
comments were moved verbatim.

Delete the sub/dir/ part from these comments.  Gets rid of several
misspellings.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190314180929.27722-3-armbru@redhat.com
Message-Id: <20190314180929.27722-3-armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2019-03-22 16:18:07 +00:00
Daniel P. Berrangé dd154c4d9f io: fix handling of EOF / error conditions in websock GSource
We were never reporting the G_IO_HUP event when an end of file was hit
on the websocket channel.

We also didn't report G_IO_ERR when we hit a fatal error processing the
websocket protocol.

The latter in particular meant that the chardev code would not notice
when an eof/error was encountered on the websocket channel, unless the
guest OS happened to trigger a write operation.

This meant that once the first client had quit, the chardev would never
listen to accept a new client.

Fixes launchpad bug 1816819
Acked-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2019-03-20 16:56:30 +00:00
Kevin Wolf 2a239e6e03 io: Remove redundant read/write_coroutine assignments
qio_channel_yield() now updates ioc->read_write/coroutine and calls
qio_channel_set_aio_fd_handlers(), so the code in the handlers has
become redundant and can be removed.

This does not make a difference in intermediate states because
aio_co_wake() really enters the coroutine immediately here: These
handlers are never run in coroutine context, and we're in the right
AioContext because qio_channel_attach_aio_context() asserts that the
handlers are inactive.

To make these conditions more obvious, assert the right AioContext.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2019-02-25 15:03:19 +01:00
Kevin Wolf 6886ceaf61 io: Make qio_channel_yield() interruptible
Similar to how qemu_co_sleep_ns() allows preemption from an external
coroutine entry, allow reentering qio_channel_yield() early.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2019-02-25 15:03:19 +01:00
Daniel P. Berrangé dbb44504c2 io: add qio_task_wait_thread to join with a background thread
Add the ability for a caller to wait for completion of the
background thread to synchronously dispatch its result, without
needing to wait for the main loop to run the idle callback.

This method needs very careful usage to avoid a dangerous
race condition with the free'ing of the task. The completion
callback is normally invoked from an idle callback registered
with the main loop context. The qio_task_wait_thread method
must only be called if the completion callback has not yet
run. The only safe way to achieve this is to run the
qio_task_wait_thread method from the thread that executes
the main loop.

It is generally a bad idea to use this method since it will
block execution of the main loop, however, the design of
the character devices and its usage from vhostuser already
requires blocking execution.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20190211182442.8542-3-berrange@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2019-02-12 17:35:56 +01:00
Daniel P. Berrangé 52d6cfeca2 io: store reference to thread information in the QIOTask struct
Currently the struct QIOTaskThreadData is only needed by the worker
thread, but a subsequent patch will need to access it from another
context.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20190211182442.8542-2-berrange@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
2019-02-12 17:35:56 +01:00
Daniel P. Berrangé 73564c407c io: ensure UNIX client doesn't unlink server socket
The qio_channel_socket_close method for was mistakenly unlinking the
UNIX server socket, even if the channel was a client connection. This
was not noticed with chardevs, since they never call close, but with the
VNC server, this caused the VNC server socket to be deleted after the
first client quit.

The qio_channel_socket_close method also needlessly reimplemented the
logic that already exists in socket_listen_cleanup(). Just call that
method directly, for listen sockets only.

This fixes a regression introduced in QEMU 3.0.0 with

  commit d66f78e1ea
  Author: Pavel Balaev <mail@void.so>
  Date:   Mon May 21 19:17:35 2018 +0300

    Delete AF_UNIX socket after close

Fixes launchpad #1795100

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2019-01-24 12:23:35 +00:00
Daniel P. Berrangé a2458b6f69 io: return 0 for EOF in TLS session read after shutdown
GNUTLS takes a paranoid approach when seeing 0 bytes returned by the
underlying OS read() function. It will consider this an error and
return GNUTLS_E_PREMATURE_TERMINATION instead of propagating the 0
return value. It expects apps to arrange for clean termination at
the protocol level and not rely on seeing EOF from a read call to
detect shutdown. This is to harden apps against a malicious 3rd party
causing termination of the sockets layer.

This is unhelpful for the QEMU NBD code which does have a clean
protocol level shutdown, but still relies on seeing 0 from the I/O
channel read in the coroutine handling incoming replies.

The upshot is that when using a plain NBD connection shutdown is
silent, but when using TLS, the client spams the console with

  Cannot read from TLS channel: Broken pipe

The NBD connection has, however, called qio_channel_shutdown()
at this point to indicate that it is done with I/O. This gives
the opportunity to optimize the code such that when the channel
has been shutdown in the read direction, the error code
GNUTLS_E_PREMATURE_TERMINATION gets turned into a '0' return
instead of an error.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20181119134228.11031-1-berrange@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
2018-11-19 11:16:46 -06:00
Marc-André Lureau ad824bdc63 websock: fix handshake leak
Missed in f69a8bde29.
Thanks Valgrind:

==955== 217 bytes in 1 blocks are definitely lost in loss record 275 of 321
==955==    at 0x483A965: realloc (vg_replace_malloc.c:785)
==955==    by 0x50B6839: __vasprintf_chk (in /usr/lib64/libc-2.28.so)
==955==    by 0x49AA05C: g_vasprintf (in /usr/lib64/libglib-2.0.so.0.5800.1)
==955==    by 0x4983440: g_strdup_vprintf (in /usr/lib64/libglib-2.0.so.0.5800.1)
==955==    by 0x126048: qio_channel_websock_handshake_send_res (channel-websock.c:162)
==955==    by 0x1266E6: qio_channel_websock_handshake_send_res_ok (channel-websock.c:362)
==955==    by 0x126D3E: qio_channel_websock_handshake_process (channel-websock.c:468)
==955==    by 0x126EF2: qio_channel_websock_handshake_read (channel-websock.c:511)
==955==    by 0x12715B: qio_channel_websock_handshake_io (channel-websock.c:571)
==955==    by 0x125027: qio_channel_fd_source_dispatch (channel-watch.c:84)
==955==    by 0x496326C: g_main_context_dispatch (in /usr/lib64/libglib-2.0.so.0.5800.1)
==955==    by 0x169EC3: glib_pollfds_poll (main-loop.c:215)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
2018-11-01 12:12:09 +04:00
Pavel Balaev d66f78e1ea Delete AF_UNIX socket after close
Since version 2.12.0 AF_UNIX socket created for QMP exchange is not
deleted on instance shutdown.

This is due to the fact that function qio_channel_socket_finalize() is
called after qio_channel_socket_close().

Signed-off-by: Pavel Balaev <mail@void.so>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-06-28 13:36:59 +01:00
Laurent Vivier 4a4ff4c58f Remove unnecessary variables for function return value
Re-run Coccinelle script scripts/coccinelle/return_directly.cocci

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
ppc part
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2018-05-20 08:48:13 +03:00
Laurent Vivier 710c263407 error: Remove NULL checks on error_propagate() calls
Re-run Coccinelle patch
scripts/coccinelle/error_propagate_null.cocci

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20180323143202.28879-4-lvivier@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
2018-03-27 10:17:32 -05:00
Daniel P. Berrange 58dc31f1a7 sockets: move fd_is_socket() into common sockets code
The fd_is_socket() helper method is useful in a few places, so put it in
the common sockets code. Make the code more compact while moving it.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2018-03-13 18:06:06 +00:00
Peter Xu 1939ccdaa6 qio: non-default context for TLS handshake
A new parameter "context" is added to qio_channel_tls_handshake() is to
allow the TLS to be run on a non-default context.  Still, no functional
change.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-03-06 10:19:07 +00:00
Peter Xu 8005fdd8fa qio: non-default context for async conn
We have worked on qio_task_run_in_thread() already.  Further, let
all the qio channel APIs use that context.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-03-06 10:19:06 +00:00
Peter Xu a17536c594 qio: non-default context for threaded qtask
qio_task_run_in_thread() allows main thread to run blocking operations
in the background. However it has an assumption on that it's always
working with the default context. This patch tries to allow the threaded
QIO task framework to run with non-default gcontext.

Currently no functional change so far, so the QIOTasks are still always
running on main context.

Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-03-06 10:19:05 +00:00
Peter Xu 938c8b79e5 qio: store gsources for net listeners
Originally we were storing the GSources tag IDs.  That'll be not enough
if we are going to support non-default gcontext for QIO code.  Switch to
GSources without changing anything real.  Now we still always pass in
NULL, which means the default gcontext.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-03-06 10:19:05 +00:00
Peter Xu 315409c711 qio: introduce qio_channel_add_watch_{full|source}
Firstly, introduce an internal qio_channel_add_watch_full(), which
enhances qio_channel_add_watch() that context can be specified.

Then add a new API wrapper qio_channel_add_watch_source() to return a
GSource pointer rather than a tag ID.

Note that the _source() call will keep a reference of GSource so that
callers need to unref them explicitly when finished using the GSource.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-03-06 10:19:04 +00:00
Peter Xu 7c28768fef qio: rename qio_task_thread_result
It is strange that it was called gio_task_thread_result.  Rename it to
follow the naming rule of the file.

Reviewed-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-03-06 10:19:03 +00:00
Markus Armbruster 9af2398977 Include less of the generated modular QAPI headers
In my "build everything" tree, a change to the types in
qapi-schema.json triggers a recompile of about 4800 out of 5100
objects.

The previous commit split up qmp-commands.h, qmp-event.h, qmp-visit.h,
qapi-types.h.  Each of these headers still includes all its shards.
Reduce compile time by including just the shards we actually need.

To illustrate the benefits: adding a type to qapi/migration.json now
recompiles some 2300 instead of 4800 objects.  The next commit will
improve it further.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180211093607.27351-24-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
[eblake: rebase to master]
Signed-off-by: Eric Blake <eblake@redhat.com>
2018-03-02 13:45:50 -06:00
Thomas Huth fe823b6f87 io/channel-command: Do not kill the child process after closing the pipe
We are currently facing some migration failure on s390x when running
certain avocado-vt tests, e.g. when running the test
type_specific.io-github-autotest-qemu.migrate.with_reboot.exec.gzip_exec.
This test is using 'migrate -d "exec:nc localhost 5200"' for the migration.
The problem is detected at the receiving side, where the migration stream
apparently ends too early. However, the cause for the problem is at the
sending side: After writing the migration stream into the pipe to netcat,
the source QEMU calls qio_channel_command_close() which closes the pipe
and immediately (!) kills the child process afterwards (via the function
qio_channel_command_abort()). So if the  sending netcat did not read the
final bytes from the pipe yet, or  if it did not manage to send out all
its buffers yet, it is killed before the whole migration stream is passed
to the destination side.

QEMU can not know how much time is required by the child process to send
over all migration data, so we should not kill it, neither directly nor
after a delay. Let's simply wait for the child process to exit gracefully
instead (this was also the behaviour of pclose() that was used in "exec:"
migration before the QIOChannel rework).

Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-02-15 16:54:57 +00:00
Ross Lagerwall b8f244b13c io: Add /dev/fdset/ support to QIOChannelFile
Add /dev/fdset/ support to QIOChannelFile by calling qemu_open() instead
of open() and qemu_close() instead of close(). There is a subtle
semantic change since qemu_open() automatically sets O_CLOEXEC, but this
doesn't affect any of the users of the function.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2018-02-15 16:54:57 +00:00
Ross Lagerwall a2565df12c io: Don't call close multiple times in QIOChannelFile
If the file descriptor underlying QIOChannelFile is closed in the
io_close() method, don't close it again in the finalize() method since
the file descriptor number may have been reused in the meantime.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2018-02-15 16:54:57 +00:00
Ross Lagerwall 902f6e14fc io: Fix QIOChannelFile when creating and opening read-write
The code wrongly passes the mode to open() only if O_WRONLY is set.
Instead, the mode should be passed when O_CREAT is set (or O_TMPFILE on
Linux). Fix this by always passing the mode since open() will correctly
ignore the mode if it is not needed. Add a testcase which exercises this
bug and also change the existing testcase to check that the mode of the
created file is correct.

Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2018-02-15 16:54:57 +00:00
Edgar Kaziakhmedov a46ded1de5 io/channel-websock: handle continuous reads without any data
According to the current implementation of websocket protocol in QEMU,
qio_channel_websock_handshake_io tries to read handshake from the
channel to start communication over socket. But this approach
doesn't cover scenario when socket was closed while handshaking.
Therefore, if G_IO_IN is caught and qio_channel_read returns zero,
error has to be set and connection has to be done.

Such behaviour causes 100% CPU load in main QEMU loop, because main loop
poll continues to receive and handle G_IO_IN events from websocket.

Step to reproduce 100% CPU load:
1) start qemu with the simplest configuration
$ qemu -vnc [::1]:1,websocket=7500
2) open any vnc listener (which doesn't follow websocket
protocol)
$ vncviewer :7500
3) kill listener
4) qemu main thread eats 100% CPU

Signed-off-by: Edgar Kaziakhmedov <edgar.kaziakhmedov@virtuozzo.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2018-02-15 16:54:57 +00:00
Paolo Bonzini 28bb0a59f8 io: fix QIONetListener memory leak
The sources array does not escape out of qio_net_listener_wait_client, so
we have to free it.

Reported by Coverity.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2018-02-15 16:54:57 +00:00
Markus Armbruster 8f0a3716e4 Clean up includes
Clean up includes so that osdep.h is included first and headers
which it implies are not included manually.

This commit was created with scripts/clean-includes, with the change
to target/s390x/gen-features.c manually reverted, and blank lines
around deletions collapsed.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180201111846.21846-3-armbru@redhat.com>
2018-02-09 05:05:11 +01:00
Daniel P. Berrange 530473924d io: introduce a network socket listener API
The existing QIOChannelSocket class provides the ability to
listen on a single socket at a time. This patch introduces
a QIONetListener class that provides a higher level API
concept around listening for network services, allowing
for listening on multiple sockets.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-12-15 15:07:26 +00:00
Peter Maydell a9038e5e19 trivial patches for 2017-10-16
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Merge remote-tracking branch 'remotes/mjt/tags/trivial-patches-fetch' into staging

trivial patches for 2017-10-16

# gpg: Signature made Mon 16 Oct 2017 21:32:05 BST
# gpg:                using RSA key 0x701B4F6B1A693E59
# gpg: Good signature from "Michael Tokarev <mjt@tls.msk.ru>"
# gpg:                 aka "Michael Tokarev <mjt@corpit.ru>"
# gpg:                 aka "Michael Tokarev <mjt@debian.org>"
# Primary key fingerprint: 6EE1 95D1 886E 8FFB 810D  4324 457C E0A0 8044 65C5
#      Subkey fingerprint: 7B73 BAD6 8BE7 A2C2 8931  4B22 701B 4F6B 1A69 3E59

* remotes/mjt/tags/trivial-patches-fetch:
  Add myself as maintainer for TPM code
  filter-mirror: segfault when specifying non existent device
  MAINTAINERS: Track default-configs/pci.mak
  MAINTAINERS: Fix Sun4v file
  MAINTAINERS: Clean up SCSI device section
  include/hw/or-irq.h: Drop unused in_irqs field
  io: Add missing GCC_FMT_ATTR (fix -Werror=suggest-attribute=format)
  os-posix: Drop misleading comment
  linux-user: Add some random ioctls
  futex: add missing header guards
  ui/gtk: Fix deprecation of vte_terminal_copy_clipboard
  gitignore: ignore check-qlit test
  linux-user: remove duplicate break in syscall
  qemu-doc.texi: remove trailing whitespace

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2017-10-17 13:13:03 +01:00
Stefan Weil 52aa5644e8 io: Add missing GCC_FMT_ATTR (fix -Werror=suggest-attribute=format)
This fixes a compiler warning:

/qemu/io/channel-websock.c:163:5: error:
 function might be possible candidate for ‘gnu_printf’ format attribute
 [-Werror=suggest-attribute=format]

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Acked-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2017-10-16 21:03:47 +03:00
Daniel P. Berrange 7fc3fcefe2 io: fix mem leak in websock error path
Coverity pointed out the 'date' is not free()d in the error
path

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16 16:57:08 +01:00
Daniel P. Berrange 0efd6c9ec1 io: add trace points for websocket HTTP protocol headers
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16 16:57:08 +01:00
Daniel P. Berrange 6d5d23b007 io: cope with websock 'Connection' header having multiple values
The noVNC server sends a header "Connection: keep-alive, Upgrade" which
fails our simple equality test. Split the header on ',', trim whitespace
and then check for 'upgrade' token.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16 16:57:08 +01:00
Daniel P. Berrange 8dfd5f9651 io: get rid of bounce buffering in websock write path
Currently most outbound I/O on the websock channel gets copied into the
rawoutput buffer, and then immediately copied again into the encoutput
buffer, with a header prepended. Now that qio_channel_websock_encode
accepts a struct iovec, we can trivially remove this bounce buffering
and write directly to encoutput.

In doing so, we also now correctly validate the encoutput size against
the QIO_CHANNEL_WEBSOCK_MAX_BUFFER limit.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16 16:57:08 +01:00
Daniel P. Berrange fb74e59039 io: pass a struct iovec into qio_channel_websock_encode
Instead of requiring use of another Buffer, pass a struct iovec
into qio_channel_websock_encode, which gives callers more
flexibility in how they process data.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16 16:57:08 +01:00
Daniel P. Berrange bac6c95415 io: get rid of qio_channel_websock_encode helper method
The qio_channel_websock_encode method is only used in one place,
everything else calls qio_channel_websock_encode_buffer directly.
It can also be pushed up a level into the qio_channel_websock_writev
method, since every other caller of qio_channel_websock_write_wire
has already filled encoutput.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16 16:57:08 +01:00
Daniel P. Berrange 57b0cdf152 io: simplify websocket ping reply handling
We must ensure we don't get flooded with ping replies if the outbound
channel is slow. Currently we do this by keeping the ping reply in a
separate temporary buffer and only writing it if the encoutput buffer
is completely empty. This is overly pessimistic, as it is reasonable
to add a ping reply to the encoutput buffer even if it has previous
data in it, as long as that previous data doesn't include a ping
reply.

To track this better, put the ping reply directly into the encoutput
buffer, and then record the size of encoutput at this time in
pong_remain. As we write encoutput to the underlying channel, we
can decrement the pong_remain counter. Once it hits zero, we can
accept further ping replies for transmission.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16 16:57:08 +01:00
Daniel P. Berrange a7b20a8efa io: monitor encoutput buffer size from websocket GSource
The websocket GSource is monitoring the size of the rawoutput
buffer to determine if the channel can accepts more writes.
The rawoutput buffer, however, is merely a temporary staging
buffer before data is copied into the encoutput buffer. Thus
its size will always be zero when the GSource runs.

This flaw causes the encoutput buffer to grow without bound
if the other end of the underlying data channel doesn't
read data being sent. This can be seen with VNC if a client
is on a slow WAN link and the guest OS is sending many screen
updates. A malicious VNC client can act like it is on a slow
link by playing a video in the guest and then reading data
very slowly, causing QEMU host memory to expand arbitrarily.

This issue is assigned CVE-2017-15268, publically reported in

  https://bugs.launchpad.net/qemu/+bug/1718964

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2017-10-16 16:57:08 +01:00