link_addr detection in configure always reports that
link_addr is missing because it uses link_addr(NULL, NULL) in
AC_LINK_IFELSE check with limited set of headers that doesn't
define NULL.

Fix by replacing 'NULL' with just '0'.

On two places, the usage of open() is replaced with qemuOpenFile as
that is the preferred method in those cases.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=963881

Function qemuOpenFile() haven't had any idea about seclabels applied
to VMs only, so in case the seclabel differed from the "user:group"
from configuration, there might have been issues with opening files.

Make qemuOpenFile() VM-aware, but only optionally, passing NULL
argument means skipping VM seclabel info completely.

However, all current qemuOpenFile() calls look like they should use VM
seclabel info in case there is any, so convert these calls as well.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=869053

Parsing 'user:group' is useful even outside the DAC security driver,
so expose the most abstract function which has no DAC security driver
bits in itself.

Since PCI bridges, PCIe bridges, PCIe switches, and PCIe root ports
all share the same namespace, they are all defined as controllers of
type='pci' in libvirt (but with a differing model attribute). Each of
these controllers has a certain connection type upstream, allows
certain connection types downstream, and each can either allow a
single downstream connection at slot 0, or connections from slot 1 -
31.

Right now, we only support the pci-root and pci-bridge devices, both
of which only allow PCI devices to connect, and both which have usable
slots 1 - 31. In preparation for adding other types of controllers
that have different capabilities, this patch 1) adds info to the
qemuDomainPCIAddressBus object to indicate the capabilities, 2) sets
those capabilities appropriately for pci-root and pci-bridge devices,
and 3) validates that the controller being connected to is the proper
type when allocating slots or validating that a user-selected slot is
appropriate for a device..

Having this infrastructure in place will make it much easier to add
support for the other PCI controller types.

While it would be possible to do all the necessary checking by just
storing the controller model in the qemyuDomainPCIAddressBus, it
greatly simplifies all the validation code to also keep a "flags",
"minSlot" and "maxSlot" for each - that way we can just check those
attributes rather than requiring a nearly identical switch statement
everywhere we need to validate compatibility.

You may notice many places where the flags are seemingly hard-coded to

  QEMU_PCI_CONNECT_HOTPLUGGABLE | QEMU_PCI_CONNECT_TYPE_PCI

This is currently the correct value for all PCI devices, and in the
future will be the default, with small bits of code added to change to
the flags for the few devices which are the exceptions to this rule.

Finally, there are a few places with "FIXME" comments. Note that these
aren't indicating places that are broken according to the currently
supported devices, they are places that will need fixing when support
for new PCI controller models is added.

To assure that there was no regression in the auto-allocation of PCI
addresses or auto-creation of integrated pci-root, ide, and usb
controllers, a new test case (pci-bridge-many-disks) has been added to
both the qemuxml2argv and qemuxml2xml tests. This new test defines a
domain with several dozen virtio disks but no pci-root or
pci-bridges. The .args file of the new test case was created using
libvirt sources from before this patch, and the test still passes
after this patch has been applied.

Although these two enums are named ..._LAST, they really had the value
of ..._SIZE. This patch changes their values so that, e.g.,
QEMU_PCI_ADDRESS_SLOT_LAST really is the slot number of the last slot
on a PCI bus.

The implicit IDE, USB, and video controllers provided by the PIIX3
chipset in the pc-* machinetypes are not present on other
machinetypes, so we shouldn't be doing the special checking for
them. This patch places those validation checks into a separate
function that is only called for machine types that have a PIIX3 chip
(which happens to be the i440fx-based pc-* machine types).

One qemuxml2argv test data file had to be changed - the
pseries-usb-multi test had included a piix3-usb-uhci device, which was
being placed at a specific address, and also had slot 2 auto reserved
for a video device, but the pseries virtual machine doesn't actually
have a PIIX3 chip, so even if there was a piix3-usb-uhci driver for
it, the device wouldn't need to reside at slot 1 function 2. I just
changed the .argv file to have the generic slot info for the two
devices that results when the special PIIX3 code isn't executed.

qemuDomainPCIAddressBus was an array of QEMU_PCI_ADDRESS_SLOT_LAST
uint8_t's, which worked fine as long as every PCI bus was
identical. In the future, some PCI busses will allow connecting PCI
devices, and some will allow PCIe devices; also some will only allow
connection of a single device, while others will allow connecting 31
devices.

In order to keep track of that information for each bus, we need to
turn qemuDomainPCIAddressBus into a struct, for now with just one
member:

   uint8_t slots[QEMU_PCI_ADDRESS_SLOT_LAST];

Additional members will come in later patches.

The item in qemuDomainPCIAddresSet that contains the array of
qemuDomainPCIAddressBus is now called "buses" to be more consistent
with the already existing "nbuses" (and with the new "slots" array).

Thanks to a lack of coordination between kernel and glibc folks,
it has been impossible to mix code using <linux/in.h> and
<net/in.h> for some time now (see for example commit c308a9ae).
On at least RHEL 6, <linux/if_bridge.h> tries to use the kernel
side, and fails due to our desire to use the glibc side elsewhere:

In file included from /usr/include/linux/if_bridge.h:17,
                 from util/virnetdevbridge.c:42:
/usr/include/linux/in6.h:31: error: redefinition of ‘struct in6_addr’
/usr/include/linux/in6.h:48: error: redefinition of ‘struct sockaddr_in6’
/usr/include/linux/in6.h:56: error: redefinition of ‘struct ipv6_mreq’

Thankfully, the kernel layout of these structs is ABI-compatible,
they only differ in the type system presented to the C compiler.
While there are other versions of kernel headers that avoid the
problem, it is easier to just work around the issue than to expect
all developers to upgrade to working kernel headers.

* src/util/virnetdevbridge.c (includes): Coerce the kernel version
of in.h to not collide with the normal version.
Signed-off-by: NEric Blake <eblake@redhat.com>

dbus 1.2.24 (on RHEL 6) lacks DBUS_TYPE_UNIX_FD; but as we aren't
trying to pass one of those anyways, we can just drop support for
it in our wrapper.  Solves this build error introduced in commit
834c9c94:

  CC     libvirt_util_la-virdbus.lo
util/virdbus.c:242: error: 'DBUS_TYPE_UNIX_FD' undeclared here (not in a function)

* src/util/virdbus.c (virDBusBasicTypes): Drop support for unix fds.
Signed-off-by: NEric Blake <eblake@redhat.com>

Update based on recent run/failures seen

Commit id '4421e257' strdup'd devAlias, but didn't free

Running qemuhotplugtest under valgrind resulted in the following:

==7375== 9 bytes in 1 blocks are definitely lost in loss record 11 of 70
==7375==    at 0x4A0887C: malloc (vg_replace_malloc.c:270)
==7375==    by 0x37C1085D71: strdup (strdup.c:42)
==7375==    by 0x4CBBD5F: virStrdup (virstring.c:554)
==7375==    by 0x4CFF9CB: virDomainEventDeviceRemovedNew (domain_event.c:1174)
==7375==    by 0x427791: qemuDomainRemoveChrDevice (qemu_hotplug.c:2508)
==7375==    by 0x42C65D: qemuDomainDetachChrDevice (qemu_hotplug.c:3357)
==7375==    by 0x41C94F: testQemuHotplug (qemuhotplugtest.c:115)
==7375==    by 0x41D817: virtTestRun (testutils.c:168)
==7375==    by 0x41C400: mymain (qemuhotplugtest.c:322)
==7375==    by 0x41DF3A: virtTestMain (testutils.c:764)
==7375==    by 0x37C1021A04: (below main) (libc-start.c:225)

Commit 'c8695053' resulted in the following:

Coverity error seen in the output:
    ERROR: REVERSE_INULL
    FUNCTION: lxcProcessAutoDestroy

Due to the 'dom' being checked before 'dom->persistent' since 'dom'
is already dereferenced prior to that.

Currently the LXC driver creates the VM's cgroup prior to
forking, and then libvirt_lxc moves the child process
into the cgroup. This won't work with systemd whose APIs
do the creation of cgroups + attachment of processes atomically.

Fortunately we simply move the entire cgroups setup into
the libvirt_lxc child process. We make it take place before
fork'ing into the background, so by the time virCommandRun
returns in the LXC driver, the cgroup is guaranteed to be
present.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Currently the QEMU driver creates the VM's cgroup prior to
forking, and then uses a virCommand hook to move the child
into the cgroup. This won't work with systemd whose APIs
do the creation of cgroups + attachment of processes atomically.

Fortunately we have a handshake taking place between the
QEMU driver and the child process prior to QEMU being exec()d,
which was introduced to allow setup of disk locking. By good
fortune this synchronization point can be used to enable the
QEMU driver to do atomic setup of cgroups removing the use
of the hook script.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The virCgroupNewDomainDriver and virCgroupNewDriver methods
are obsolete now that we can auto-detect existing cgroup
placement. Delete them to reduce code bloat.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Use the new virCgroupNewDetect function to determine cgroup
placement of existing running VMs. This will allow the legacy
cgroups creation APIs to be removed entirely
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Add virCgroupIsValidMachine API to check whether an auto
detected cgroup is valid for a machine. This lets us
check if a VM has just been placed into some generic
shared cgroup, or worse, the root cgroup
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Add a virCgroupNewDetect API which is used to initialize a
cgroup object with the placement of an arbitrary process.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

If systemd machine does not exist, return -2 instead of -1,
so that applications don't need to repeat the tedious error
checking code
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Current code for handling dbus errors only works for errors
received from the remote application itself. We must also
handle errors emitted by the bus itself, for example, when
it fails to spawn the target service.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Add a privileged field to storageDriverState

Use the privileged value in order to generate a connection which could
be passed to the various storage backend drivers.

In particular, the iSCSI driver will need a connect in order to perform
pool authentication using the 'chap' secrets and the RBD driver utilizes
the connection during pool refresh for pools using 'ceph' secrets.

For now that connection will be to be to qemu driver until a mechanism
is devised to get a connection to just the secret driver without qemu.

Update virStorageBackendRBDOpenRADOSConn() to use the internal API to the
secret driver in order to get the secret value instead of the external
virSecretGetValue() path. Without the flag VIR_SECRET_GET_VALUE_INTERNAL_CALL
there is no way to get the value of private secret.

This also requires ensuring there is a connection which wasn't true for
for the refreshPool() path calls from storageDriverAutostart() prior to
adding support for the connection to a qemu driver. It seems calls to
virSecretLookupByUUIDString() and virSecretLookupByUsage() from the
refreshPool() path would have failed with no way to find the secret - that is
theoretically speaking since the 'conn' was NULL the failure would have been
"failed to find the secret".

Although the XML for CHAP authentication with plain "password"
was introduced long ago, the function was never implemented. This
patch replaces the login/password mechanism by following the
'ceph' (or RBD) model of using a 'username' with a 'secret' which
has the authentication information.

This patch performs the authentication during startPool() processing
of pools with an authType of VIR_STORAGE_POOL_AUTH_CHAP specified
for iSCSI pools.

There are two types of CHAP configurations supported for iSCSI
authentication:

  * Initiator Authentication
      Forward, one-way; The initiator is authenticated by the target.

  * Target Authentication
      Reverse, Bi-directional, mutual, two-way; The target is authenticated
      by the initiator; This method also requires Initiator Authentication

This only supports the "Initiator Authentication". (I don't have any
enterprise iSCSI env for testing, only have a iSCSI target setup with
tgtd, which doesn't support "Target Authentication").

"Discovery authentication" is not supported by tgt yet too. So this only
setup the session authentication by executing 3 iscsiadm commands, E.g:

% iscsiadm -m node --target "iqn.2013-05.test:iscsi.foo" --name \
  "node.session.auth.authmethod" -v "CHAP" --op update

% iscsiadm -m node --target "iqn.2013-05.test:iscsi.foo" --name \
  "node.session.auth.username" -v "Jim" --op update

% iscsiadm -m node --target "iqn.2013-05.test:iscsi.foo" --name \
  "node.session.auth.password" -v "Jimsecret" --op update

Split out into its own separate routine

Make the secret fetching code common for qemuBuildRBDString() and
qemuBuildDriveURIString() using the virDomainDiskDef.

During qemuTranslateDiskSourcePool() execution, if the srcpool has been
defined with authentication information, then for iSCSI pools copy the
authentication and host information to virDomainDiskDef.

Due to a goto statement missed when refactoring in 2771f8b7
when acquiring of a domain job failed the error path was not taken. This
resulted into a crash afterwards as an extra reference was removed from a
domain object leading to it being freed. An attempt to list the domains
leaded to a crash of the daemon afterwards.

https://bugzilla.redhat.com/show_bug.cgi?id=928672

util/virdbuspriv.h needed to be added to UTIL_SOURCES in the makefile.

Continue preparation for extracting platform-specific
parts from bridge_driver: s/Iptables/Firewall/ for
firewall related function names.

Commit 834c9c94 introduced virDBusMessageEncode and
virDBusMessageDecode functions, however corresponding stubs
were not added to !WITH_DBUS section, therefore 'make check'
started to fail when compiled w/out dbus support like that:

Expected symbol virDBusMessageDecode is not in ELF library

Resolves:https://bugzilla.redhat.com/show_bug.cgi?id=923053
When cdrom is block type, the virsh change-media failed to insert
source info because virsh uses "<source block='/dev/sdb'/>" while
the correct name of the attribute for block disks is "dev".

The translation must be done before both of cgroup and security
setting, otherwise since the disk source is not translated yet,
it might be skipped on cgroup and security setting.

virDomainDiskDefForeachPath is not only used by the security
setting helpers, also used by cgroup setting helpers, so this
is to ignore the volume type disk with mode="direct" for cgroup
setting.

The difference with already supported pool types (dir, fs, block)
is: there are two modes for iscsi pool (or network pools in future),
one can specify it either to use the volume target path (the path
showed up on host) with mode='host', or to use the remote URI qemu
supports (e.g. file=iscsi://example.org:6000/iqn.1992-01.com.example/1)
with mode='direct'.

For 'host' mode, it copies the volume target path into disk->src. For
'direct' mode, the corresponding info in the *one* pool source host def
is copied to disk->hosts[0].

Introduce a new helper to check if the disk source is of block type

There are two ways to use a iSCSI LUN as disk source for qemu.

 * The LUN's path as it shows up on host, e.g.
   /dev/disk/by-path/ip-$ip:3260-iscsi-$iqn-fc18:iscsi.iscsi0-lun-1

 * The libiscsi URI from the storage pool source element host attribute, e.g.
   iscsi://demo.org:6000/iqn.1992-01.com.example/1

For a "volume" type disk, if the specified "pool" is of iscsi
type, we should support to use the LUN in either of above 2 ways.
That's why to introduce a new XML tag "mode" for the disk source
(libvirt should support iscsi pool with libiscsi, but it's another
new feature, which should be done later).

The "mode" can be either of "host" or "direct". Use "host" to indicate
use of the LUN with the path as it shows up on host. Use "direct" to
indicate to use it with the source pool host URI (future patches may support
to use network type libvirt storage too, e.g. Ceph)

Make sure default iSCSI target is 3260.

Commit 58b147ad added a test for
qemuMonitorGetDeviceAliases but forgot to free the test object at the
end which causes all sort of weird errors and failures when new tests
are added after the GetDeviceAliases.

The description seems to be copied from virNodeGetCpuState.
Change wrong 'cpu' to 'memory'.
Signed-off-by: NPhilipp Hahn <hahn@univention.de>