There is a possibility that we jump onto error label with @lockpath
still initialized to NULL. Here, the @lockpath should be unlink()-ed,
but passing there a NULL is not a good idea. Don't do that. In fact,
we should call unlink() only if we created the lock file successfully.
Reported-by: John Ferlan <jferlan@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1200149
Even though we have a mutex mechanism so that two clients don't spawn
two daemons, it's not strong enough. It can happen that while one
client is spawning the daemon, the other one fails to connect.
Basically two possible errors can happen:
error: Failed to connect socket to '/home/mprivozn/.cache/libvirt/libvirt-sock': Connection refused
or:
error: Failed to connect socket to '/home/mprivozn/.cache/libvirt/libvirt-sock': No such file or directory
The problem in both cases is, the daemon is only starting up, while we
are trying to connect (and fail). We should postpone the connecting
phase until the daemon is started (by the other thread that is
spawning it). In order to do that, create a file lock 'libvirt-lock'
in the directory where session daemon would create its socket. So even
when called from multiple processes, spawning a daemon will serialize
on the file lock. So only the first to come will spawn the daemon.
Tested-by: Richard W. M. Jones <rjones@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
While this thread is cleaning up the client and connection objects:
#2 virFileReadAll (path=0x7f28780012b0 "/proc/1319/stat", maxlen=maxlen@entry=1024, buf=buf@entry=0x7f289c60fc40) at util/virfile.c:1287
#3 0x00007f28adbb1539 in virProcessGetStartTime (pid=<optimized out>, timestamp=timestamp@entry=0x7f289c60fc98) at util/virprocess.c:838
#4 0x00007f28adb91981 in virIdentityGetSystem () at util/viridentity.c:151
#5 0x00007f28ae73f17c in remoteClientFreeFunc (data=<optimized out>) at remote.c:1131
#6 0x00007f28adcb7f33 in virNetServerClientDispose (obj=0x7f28aecad180) at rpc/virnetserverclient.c:858
#7 0x00007f28adba8eeb in virObjectUnref (anyobj=<optimized out>) at util/virobject.c:265
#8 0x00007f28ae74ad05 in virNetServerHandleJob (jobOpaque=<optimized out>, opaque=0x7f28aec93ff0) at rpc/virnetserver.c:205
#9 0x00007f28adbbef4e in virThreadPoolWorker (opaque=opaque@entry=0x7f28aec88030) at util/virthreadpool.c:145
In stack frame #6 the client->identity object got unref'd, but the code
that removes the event callbacks in frame #5 did not run yet as we are
trying to obtain the system identity (frames #4, #3, #2).
In other thead:
#0 virObjectUnref (anyobj=anyobj@entry=0x7f288c162c60) at util/virobject.c:264
klass = 0xdeadbeef
obj = 0x7f288c162c60
#1 0x00007f28ae71c709 in remoteRelayDomainEventCheckACL (client=<optimized out>, conn=<optimized out>, dom=dom@entry=0x7f28aecaafc0) at remote.c:164
#2 0x00007f28ae71fc83 in remoteRelayDomainEventTrayChange (conn=<optimized out>, dom=0x7f28aecaafc0, ... ) at remote.c:717
#3 0x00007f28adc04e53 in virDomainEventDispatchDefaultFunc (conn=0x7f287c0009a0, event=0x7f28aecab1a0, ...) at conf/domain_event.c:1455
#4 0x00007f28adc03831 in virObjectEventStateDispatchCallbacks (callbacks=<optimized out>, ....) at conf/object_event.c:724
#5 virObjectEventStateQueueDispatch (callbacks=0x7f288c083730, queue=0x7fff51f90030, state=0x7f288c18da20) at conf/object_event.c:738
#6 virObjectEventStateFlush (state=0x7f288c18da20) at conf/object_event.c:816
#7 virObjectEventTimer (timer=<optimized out>, opaque=0x7f288c18da20) at conf/object_event.c:562
#8 0x00007f28adb859cd in virEventPollDispatchTimeouts () at util/vireventpoll.c:459
Frame #0 is unrefing an invalid identity object while frame #2 hints
that the client is still dispatching the event.
For untrimmed backtrace see the bugzilla attachment.
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1203030
As of bba93d40 all of our RPC objects are derived from
virObjectLockable. However, during rewrite some errors sneaked
in. For instance, the dispose functions to virNetClient and
virNetServerClient objects were not only freeing allocated
memory, but unlocking themselves. This is wrong. Object should
never disappear while locked.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Whenever client socket was marked as closed for some reason, it could've
been changed when really closing the connection. With this patch the
proper reason is kept since the first time it's marked as closed.
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
getsockopt(sock->fd, SOL_SOCKET, SO_PEERCRED, ...) sets the pid to 0
when the process that opens the connection is in another container.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Since the secondary drivers are only active when the primary
driver is also the remote driver, there is no need to use the
different type specific privateData fields.
We have these configuration knobs, like max_clients and
max_anonymous_clients. They limit the number of clients
connected. Whenever the limit is reached, the daemon stops
accepting new ones and resumes if one of the connected clients
disconnects. If that's the case, a debug message is printed into
the logs. And when the daemon starts over to accept new clients
too. However, the problem is the messages have debug priority.
This may be unfortunate, because if the daemon stops accepting
new clients all of a sudden, and users don't have debug logs
enabled they have no idea what's going on. Raise the messages
level to INFO at least.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Update virNetServerClientCreateIdentity and virIdentityGetSystem
to use the new typesafe APIs for setting identity attributes
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
When FIPS mode is on, gnutls_dh_params_generate2 will fail if 1024 is
specified as the prime's number of bits, a bigger value works in both
cases.
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
Since 1b807f92, connecting with virsh to an already running session
libvirtd fails with:
$ virsh list --all
error: failed to connect to the hypervisor
error: no valid connection
error: Failed to connect socket to
'/run/user/1000/libvirt/libvirt-sock': Transport endpoint is already
connected
This is caused by a logic error in virNetSocketNewConnectUnix: even if
the connection to the daemon socket succeeded, we still try to spawn the
daemon and then connect to it.
This commit changes the logic to not try to spawn libvirtd if we
successfully connected to its socket.
Most of this commit is whitespace changes, use of -w is recommended to
look at it.
Coverity complained about the following:
(3) Event ptr_arith:
Performing pointer arithmetic on "cur_fd" in expression "cur_fd++".
130 return virNetServerServiceNewFD(*cur_fd++,
The complaint is that pointer arithmetic taking place instead of the
expected auto increment of the variable... Adding some well placed
parentheses ensures our order of operation.
I noticed a line 'int nparams = 0;;' in remote_dispatch.h, and
tracked down where it was generated. While at it, I found a
couple of other double semicolons. Additionally, I noticed that
commit df0b57a95 left a stale reference to the file name
remote_dispatch_bodies.h.
* src/conf/numatune_conf.c (virDomainNumatuneNodeParseXML): Drop
empty statement.
* tests/virdbustest.c (testMessageStruct, testMessageSimple):
Likewise.
* src/rpc/gendispatch.pl (remote_dispatch_bodies.h): Likewise, and
update stale comments.
Signed-off-by: Eric Blake <eblake@redhat.com>
Since '1b807f92d' - Coverity complains that in the error paths of
both virFork() and virProcessWait() that the 'passfd' will not be closed.
Added the VIR_FORCE_CLOSE(passfd) and initialized it to -1.
Also noted that variable 'buf' was never really used - so I removed it
It's just a wrapper around NewFD and NewUNIX that selects the right
option and increments the number of used FDs.
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Replace:
if (virBufferError(&buf)) {
virBufferFreeAndReset(&buf);
virReportOOMError();
...
}
with:
if (virBufferCheckError(&buf) < 0)
...
This should not be a functional change (unless some callers
misused the virBuffer APIs - a different error would be reported
then)
New rules are added in fixup_name in gendispatch.pl to keep the name
FSFreeze and FSThaw. This adds a new ACL permission 'fs_freeze',
which is also applied to VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE flag.
Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@hds.com>
Acked-by: Daniel P. Berrange <berrange@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
SO_REUSEADDR on Windows is actually akin to SO_REUSEPORT
on Linux/BSD. ie it allows 2 apps to listen to the same
port at once. Thus we must not set it on Win32 platforms
See http://msdn.microsoft.com/en-us/library/windows/desktop/ms740621.aspx
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
These are the first async events in the qemu protocol, so this
patch looks rather big compared to most RPC additions. However,
a large majority of this patch is just mechanical copy-and-paste
from recently-added network events. It didn't help that this
is also the first virConnect rather than virDomain prefix
associated with a qemu-specific API.
* src/remote/qemu_protocol.x (qemu_*_domain_monitor_event_*): New
structs and RPC messages.
* src/rpc/gendispatch.pl: Adjust naming conventions.
* daemon/libvirtd.h (daemonClientPrivate): Track qemu events.
* daemon/remote.c (remoteClientFreeFunc): Likewise.
(remoteRelayDomainQemuMonitorEvent)
(qemuDispatchConnectDomainMonitorEventRegister)
(qemuDispatchConnectDomainMonitorEventDeregister): New functions.
* src/remote/remote_driver.c (qemuEvents): Handle qemu events.
(doRemoteOpen): Register for events.
(remoteNetworkBuildEventLifecycle)
(remoteConnectDomainQemuMonitorEventRegister)
(remoteConnectDomainQemuMonitorEventDeregister): New functions.
* src/qemu_protocol-structs: Regenerate.
Signed-off-by: Eric Blake <eblake@redhat.com>
Currently, we use pthread_sigmask(SIG_BLOCK, ...) prior to calling
poll(). This is okay, as we don't want poll() to be interrupted.
However, then - immediately as we fall out from the poll() - we try to
restore the original sigmask - again using SIG_BLOCK. But as the man
page says, SIG_BLOCK adds signals to the signal mask:
SIG_BLOCK
The set of blocked signals is the union of the current set and the set argument.
Therefore, when restoring the original mask, we need to completely
overwrite the one we set earlier and hence we should be using:
SIG_SETMASK
The set of blocked signals is set to the argument set.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
A earlier commit changed the global log buffer so that it only
records messages that are explicitly requested via the log
filters setting. This removes the performance burden, and
improves the signal/noise ratio for messages in the global
buffer. At the same time though, it is somewhat pointless, since
all the recorded log messages are already going to be sent to an
explicit log output like syslog, stderr or the journal. The
global log buffer is thus just duplicating this data on stderr
upon crash.
The log_buffer_size config parameter is left in the augeas
lens to prevent breakage for users on upgrade. It is however
completely ignored hereafter.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Any source file which calls the logging APIs now needs
to have a VIR_LOG_INIT("source.name") declaration at
the start of the file. This provides a static variable
of the virLogSource type.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The dtrace probe macros rely on the logging API. We can't make
the internal.h header include the virlog.h header though since
that'd be a circular include. Instead simply split the dtrace
probes into their own header file, since there's no compelling
reason for them to be in the main internal.h header.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Coverity spotted a use of possibly undefined variable. If a server is
restarting as an result of update, the JSON file that keeps current
value of some variables will not contain the new variables. This is
the case of @max_anonymous_clients too. We are correctly querying if
there's "max_anonymous_clients" in the JSON, however, we are not
setting a sane default if there's none.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Commit a1cbe4b5 added a check for spaces around assignments and this
patch extends it to checks for spaces around '=='. One exception is
virAssertCmpInt where comma after '==' is acceptable (since it is a
macro and '==' is its argument).
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=992980
This config tunable allows users to determine the maximum number of
accepted but yet not authenticated users.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
The counter gets incremented on each unauthenticated client added to the
server and decremented whenever the client authenticates.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
