Currently, the functions return a pointer to the
destination buffer on success or NULL on failure.

Not only does this kind of error handling look quite
alien in the context of libvirt, where most functions
return zero on success and a negative int on failure,
but it's also somewhat pointless because unless there's
been a failure the returned pointer will be the same
one passed in by the user, thus offering no additional
value.

Change the functions so that they return an int
instead.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

The strncpy() function has this quirk where it will copy
*up* to the requested number of bytes, that is, it will
stop early if it encounters a NULL byte in the source
string.

This makes it legal to pass the size of the destination
buffer (minus one byte needed for the string terminator)
as the number of bytes to copy and still get something
somewhat reasonable out of the operation; unfortunately,
it also makes the function difficult to reason about
and way too easy to misuse.

We want to move away from the way strncpy() behaves and
towards better defined semantics, where virStrncpy()
will always copy *exactly* the number of bytes it's
been asked to copy; before we can do that, though, we
have to change a few of the callers.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

virStrncpy() allows us to copy a substring, but if we're
going to copy the entire thing it's much more convenient
to use virStrcpy() instead.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

virStrcpy() and friends are useful when the destination
buffer has already been allocated, eg. as part of a struct;
if we have to allocate it on the spot, VIR_STRDUP() is a
better choice.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

This convenience macro was created for the simple cases
where the length of the source string and the size of the
destination buffer can be figued out with strlen() and
sizeof() respectively, so we should use it wherever
possible instead of open-coding parts of it.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

The way virStrncpy() is called here will never result in
buffer overflow, but it won't prevent or detect truncation
either, despite what the error message might suggest. Use
virStrcpyStatic(), which does all of the above, instead.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>

All our supported RHEL and Fedora versions include systemd, so we can
assume it is always present in the spec.
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

We no longer build on RHEL-6, so can bump min required RHEL to 7
removing many conditions.
Reviewed-by: NAndrea Bolognani <abologna@redhat.com>
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

When gnutls negotiates TLS 1.3 instead of 1.2, the order of messages
sent by the handshake changes. This exposed a logic bug in the test
suite which caused us to wait for the server to see handshake
completion, but not wait for the client to see completion. The result
was the client didn't receive the certificate for verification and the
test failed.

This is exposed in Fedora 29 rawhide which has just enabled TLS 1.3 in
its GNUTLS builds.
Signed-off-by: NDaniel P. Berrangé <berrange@redhat.com>

Add --alias to support custom alias in virsh attach-interface.
Signed-off-by: NHan Han <hhan@redhat.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

Add --alias to support custom disk alias in virsh attach-disk.
Signed-off-by: NHan Han <hhan@redhat.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

https://bugzilla.redhat.com/show_bug.cgi?id=1603025

Commit b57a9aec neglected to VIR_FREE(binding->filtername) as seen
in the following valgrind report

==6423== 17,328 bytes in 1,083 blocks are definitely lost in loss record 2,275 of 2,297
==6423==    at 0x4C29BC3: malloc (vg_replace_malloc.c:299)
==6423==    by 0x83B20C9: strdup (in /usr/lib64/libc-2.17.so)
==6423==    by 0x533C144: virStrdup (virstring.c:977)
==6423==    by 0x54BDD53: virGetNWFilterBinding (datatypes.c:865)
==6423==    by 0x318D633C: nwfilterBindingCreateXML (nwfilter_driver.c:767)
==6423==    by 0x54F3FC5: virNWFilterBindingCreateXML (libvirt-nwfilter.c:701)
==6423==    by 0x539CE29: virDomainConfNWFilterInstantiate (domain_nwfilter.c:116)
==6423==    by 0x31E516C2: qemuInterfaceBridgeConnect (qemu_interface.c:589)
==6423==    by 0x31D98B56: qemuBuildInterfaceCommandLine (qemu_command.c:8418)
==6423==    by 0x31D9F783: qemuBuildNetCommandLine (qemu_command.c:8673)
==6423==    by 0x31D9F783: qemuBuildCommandLine (qemu_command.c:10354)
==6423==    by 0x31DE355F: qemuProcessLaunch (qemu_process.c:6292)
==6423==    by 0x31DE7881: qemuProcessStart (qemu_process.c:6686)

and

==6423== 17,328 bytes in 1,083 blocks are definitely lost in loss record 2,276 of 2,297
==6423==    at 0x4C29BC3: malloc (vg_replace_malloc.c:299)
==6423==    by 0x83B20C9: strdup (in /usr/lib64/libc-2.17.so)
==6423==    by 0x533C144: virStrdup (virstring.c:977)
==6423==    by 0x54BDD53: virGetNWFilterBinding (datatypes.c:865)
==6423==    by 0x318D641F: nwfilterBindingLookupByPortDev (nwfilter_driver.c:678)
==6423==    by 0x54F3B63: virNWFilterBindingLookupByPortDev (libvirt-nwfilter.c:593)
==6423==    by 0x539CBC5: virDomainConfNWFilterTeardownImpl.isra.0 (domain_nwfilter.c:136)
==6423==    by 0x539CFA5: virDomainConfVMNWFilterTeardown (domain_nwfilter.c:170)
==6423==    by 0x31DE5651: qemuProcessStop (qemu_process.c:6912)
==6423==    by 0x31E37974: qemuDomainDestroyFlags (qemu_driver.c:2229)
==6423==    by 0x54C24BB: virDomainDestroy (libvirt-domain.c:475)
==6423==    by 0x1589A2: remoteDispatchDomainDestroy (remote_daemon_dispatch_stubs.h:4827)
==6423==    by 0x1589A2: remoteDispatchDomainDestroyHelper (remote_daemon_dispatch_stubs.h:4803)
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
Reviewed-by: NDaniel P. Berrangé <berrange@redhat.com>

The include guard should match the file name and comment.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

Signed-off-by: NMarc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

Hypervisor drivers (e.g. QEMU) assume that they run in a separate
thread from the main event loop thread otherwise deadlocks can
occur. Therefore let's report an error if max_workers < 1 is set in
the libvirtd configuration file.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: NBjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

...since maxWorkers=0 is only intended for virtlockd or virlogd which
must not be multithreaded.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: NBjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

@srv must be unlocked for the call virNetServerProcessMsg otherwise a
deadlock can occur.

Since the pointer 'srv->workers' will never be changed after
initialization and the thread pool has it's own locking we can release
the lock of 'srv' earlier. This also fixes the deadlock.
Signed-off-by: NMarc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: NBjoern Walk <bwalk@linux.ibm.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

Now that we have a saner replacement for checking if the disk source is
the same use it instead of formatting qemu command-line chunks.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

To allow checking whether a storage source points to the same location
add a helper which checks the relevant fields. This will allow replacing
a similar check done by formatting the command line arguments for
qemu-like syntax.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Extract the code for future reuse.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The code is useful also when gathering statistics per node name, so
extract it to a separate functions.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The 'query-blockstats' command does not return statistics for the
explicitly named nodes unless the new argument is specified. Add
infrastrucuture that will allow us to use the new approach if desired.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Use the proper backend for the block device both when using -drive and
when -blockdev will be used for disk drives and floppy disks.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The disk backend alias was historically the alias of the -drive backing
the storage. For setups with -blockdev this will become more complex as
it will depend on other configs and generally will differ.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

In some cases backing chain needs to be cleared prior to re-detection.
Move this step out of qemuDomainDetermineDiskChain as only certain
places need it and the function itself is able to skip to the end of the
chain to perform detection.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Allow updating capacity for the block devices returned by
qemuDomainBlocksStatsGather and replace the open-coded call to
qemuMonitorGetAllBlockStatsInfo by the helper.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Despite the warning that virStorageSourceCopy needs to be populated on
additions to the structure commit 68773054 neglected to implement the
copy function.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

When changing cdrom media we did not handle the managed PR objects thus
we'd either have a stale PR object left behind or the media change would
fail.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Remove the issue of the monitor command to the caller so that the
function can be used with the modern approach.

Additionally improve the error message.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Prepare for the -blockdev implementation of ejectable media changing by
splitting up the old bits.

Additionally since both callers make sure that the device is a cdrom or
floppy the check is no longer necessary.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Similarly to qemuDomainDiskRemoveManagedPR make it enter monitor on
its own so that it can be reused. Future users will be in the snapshot
code and in removable media change code.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Extract the (possible) removal of the PR backend and daemon into a
separate helper which enters monitor on its own. This simplifies the
code and allows reuse of this function in the future e.g. for blockjobs
where removing a image with PR may result into PR not being necessary.

Since the PR is not used often the overhead of entering monitor again
should be negligible.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Add code which will convert a disk definition into
qemuHotplugDiskSourceData and then reuse qemuHotplugDiskSourceRemove to
remove all the backend related objects.

This unifies the detach code as much as possible with the already
existing helpers and will allow reuse this infrastructure when changing
removable disk media.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

qemuDomainRemoveDiskDevice would leak the disk to be removed if the VM
crashed since it was removed from the definition but not freed.

Broken in commit 105bcdde which moved the removal from the definition
earlier.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Similarly to how we've intergrated data belonging to a single
virStorageSource for purposes of attaching it to a qemu instance we will
need to agregate data relevant for the whole disk. With blockdev there
will be some disk-wide backing chain members such as the copy-on-read
handler.

Introduce qemuHotplugDiskSourceData which agregates the backing chain
and other data relevant for the disk and functions which generate it
and apply and rollback it.

In addition to disk hotplug this will also be reused for media changing
where we need to exchange the full disk backend.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

The warning messages which include the disk source could potentially
format NULL using %s as virDomainDiskGetSource may return NULL for e.g.
NBD disks. As most of the APIs are NOOP for remote disks the usage of
the source string only should be fine for now.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

Now that there's only one use of it, replace it directly by the code
filling it.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

qemuHotplugPrepareDiskAccess can be used to tear down disk access so we
can replace the open-coded version collecting the same function calls.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

https://bugzilla.redhat.com/show_bug.cgi?id=1601377

Fix typo from commit id d45bee44 for the parent_wwpn field
resulting in parent_wwnn being printed twice.
Signed-off-by: NJohn Ferlan <jferlan@redhat.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>

Now that we use only the separate function for creating data for the
'transaction' command we can remove all the boilerplate which was
necessary before.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>