Currently, kernel supports up to 8 queues for a multiqueue tap device.
However, if user tries to enter a huge number (e.g. one million) the tap
allocation fails, as expected. But what is not expected is the log full
of warnings:

    warning : virFileClose:83 : Tried to close invalid fd 0

The problem is, upon error we iterate over an array of FDs (handlers to
queues) and VIR_FORCE_CLOSE() over each item. However, the array is
pre-filled with zeros. Hence, we repeatedly close stdin. Ouch.
But there's more. The queues allocation is done in virNetDevTapCreate()
which cleans up the FDs in case of error. Then, its caller, the
virNetDevTapCreateInBridgePort() iterates over the FD array and tries to
close them too. And so does qemuNetworkIfaceConnect() and
qemuBuildInterfaceCommandLine().

https://bugzilla.redhat.com/show_bug.cgi?id=1003828

The vshWatchJob function registers a SIGINT handler that is used to
abort the active job and does not terminate virsh. Unfortunately, this
breaks when using the ssh transport as SIGINT is sent to the foreground
process group including the ssh transport processes which terminate.
This breaks the connection and migration is left in a insane state.

With this patch the terminal is modified to ignore key binding that
sends SIGINT and does the handling manually.

Resoves: https://bugzilla.redhat.com/show_bug.cgi?id=983348

This patch adds instrumentation to allow modification of config of the
terminal in virsh and successful reset of the state afterwards.

The added helpers allow to disable receiving of SIGINT when pressing the
key sequence (Ctrl+C usualy). This normally sends SIGINT to the
foreground process group which kills ssh processes used for transport of
the data.

According to VMWare's documentation 'cdrom-raw' is an acceptable value
for deviceType for a CD-ROM drive. The documentation states that the VMX
configuration for a CD-ROM deviceType is as follows:

ide|scsi(n):(n).deviceType = "cdrom-raw|atapi-cdrom|cdrom-image"

From the documentation it appears the following is true:
- cdrom-image = Provides the ISO to the VM
- atapi-cdrom = Provides a NEC emulated ATAPI CD-ROM on top of the host
  CD-ROM
- cdrom-raw = Passthru for a host CD-ROM drive. Allows CD-R burning from
  within the guest.

A CD-ROM prior to this patch would always provide an 'atapi-cdrom' is
modeled as:
  <disk type='block' device='cdrom'>
    <source dev='/dev/scd0'/>
    <target dev='hda' bus='ide'/>
    <address type='drive' controller='0' bus='0' target='0' unit='0'/>
  </disk>

This patch allows the 'device' attribute to be set to 'lun' for a raw
acccess CD-ROM such as:
  <disk type='block' device='lun'>
    <source dev='/dev/scd0'/>
    <target dev='hda' bus='ide'/>
    <address type='drive' controller='0' bus='0' target='0' unit='0'/>
  </disk>

Sometimes a serial port might not be actually wired to a device when the
user does not have the VM powered on and we should not consider this a
fatal error.

Starting with qemu 1.6, the qemu-system-arm vexpress-a9 model has a
hardcoded virtio-mmio transport which enables attaching all virtio
devices.

On the command line, we have to use virtio-XXX-device rather than
virtio-XXX-pci, thankfully s390 already set the precedent here so
it's fairly straight forward.

At the XML level, this adds a new device address type virtio-mmio.
The controller and addressing don't have any subelements at the
moment because we they aren't needed for this usecase, but could
be added later if needed.

Add a test case for an ARM guest with one of every virtio device
enabled.

Similar to the chardev bit, ARM boards depend on the old style '-net nic'
for actually instantiating net devices. But we can't block out
-netdev altogether since it's needed for upcoming virtio support.

And add tests for working ARM XML with console, disk, and networking.

This corresponds to '-sd' and '-drive if=sd' on the qemu command line.
Needed for many ARM boards which don't provide any other way to
pass in storage.

QEMU ARM boards don't give us any way to explicitly wire in
a -chardev, so use the old style -serial options.

Unfortunately this isn't as simple as just turning off the CHARDEV flag
for qemu-system-arm, as upcoming virtio support _will_ use device/chardev.

And add test cases for a basic working ARM guest.

This should be a no-op change for now.

On my machine, a guest fails to boot if it has a sound card, but not
graphical device/display is configured, because pulseaudio fails to
initialize since it can't access $HOME.

A workaround is removing the audio device, however on ARM boards there
isn't any option to do that, so -nographic always fails.

Set QEMU_AUDIO_DRV=none if no <graphics> are configured. Unfortunately
this has massive test suite fallout.

Add a qemu.conf parameter nographics_allow_host_audio, that if enabled
will pass through QEMU_AUDIO_DRV from sysconfig (similar to
vnc_allow_host_audio)

This gives us a RO got, otherwise Debian's lintian complains:

W: libvirt-bin: hardening-no-relro usr/lib/libvirt/connection-driver/libvirt_driver_qemu.so
W: libvirt-bin: hardening-no-relro usr/lib/libvirt/connection-driver/libvirt_driver_storage.so
W: libvirt-bin: hardening-no-relro usr/lib/libvirt/connection-driver/libvirt_driver_uml.so
W: libvirt-bin: hardening-no-relro usr/lib/libvirt/connection-driver/libvirt_driver_vbox.so
W: libvirt-bin: hardening-no-relro usr/lib/libvirt/connection-driver/libvirt_driver_xen.so
W: libvirt-bin: hardening-no-relro usr/lib/libvirt/connection-driver/libvirt_driver_nwfilter.so
W: libvirt-bin: hardening-no-relro usr/lib/libvirt/connection-driver/libvirt_driver_storage.so
W: libvirt-bin: hardening-no-relro usr/lib/libvirt/connection-driver/libvirt_driver_uml.so
W: libvirt-sanlock: hardening-no-relro usr/lib/libvirt/lock-driver/sanlock.so

Add an attribute named 'removable' to the 'target' element of disks,
which controls the removable flag. For instance, on a Linux guest it
controls the value of /sys/block/$dev/removable. This option is only
valid for USB disks (i.e. bus='usb'), and its default value is 'off',
which is the same behaviour as before.

To achieve this, 'removable=on' (or 'off') is appended to the '-device
usb-storage' parameter sent to qemu when adding a USB disk via
'-disk'. A capability flag QEMU_CAPS_USB_STORAGE_REMOVABLE was added
to keep track if this option is supported by the qemu version used.

Bug: https://bugzilla.redhat.com/show_bug.cgi?id=922495Signed-off-by: NPeter Krempa <pkrempa@redhat.com>

Allow use of the usb-storage device only if the new capability flag
QEMU_CAPS_DEVICE_USB_STORAGE is set, which it is for qemu(-kvm)
versions >= 0.12.1.2-rhel62-beta.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>

virVMXFormatHardDisk() and virVMXFormatCDROM() duplicated a lot of code
from each other and made a lot of nested if checks to build each part of
the VMX file. This hopefully simplifies the code path while combining
the two functions with no net difference.

* configure.ac docs/news.html.in libvirt.spec.in: update for the release
* po/*.po*: merged new localizations and regenerated

Remove unused 'cgroup' variable in qemuDomainAttachDeviceDiskLive() to
resolve coverity DEADCODE complaint

When virBufferError is ok in cmdAttachDisk, the latter
should 'goto cleanup', instead of returning a false to
prevent memory leaking.
Signed-off-by: NEric Blake <eblake@redhat.com>

Since virtlockd is only built when libvirtd is built, we should
not install its auxiliary files unconditionally.  This solves
two failures.  1. 'make distcheck' complains:

rm -f Makefile
ERROR: files left in build directory after distclean:
./src/virtlockd.8

2. './autobuild.sh' complains:

Checking for unpackaged file(s): /usr/lib/rpm/check-files
/home/eblake/rpmbuild/BUILDROOT/mingw-libvirt-1.1.1-1.fc19.eblake1377879911.x86_64
error: Installed (but unpackaged) file(s) found:
   /usr/i686-w64-mingw32/sys-root/mingw/etc/libvirt/virtlockd.conf

/usr/i686-w64-mingw32/sys-root/mingw/share/augeas/lenses/tests/test_virtlockd.aug
   /usr/i686-w64-mingw32/sys-root/mingw/share/augeas/lenses/virtlockd.aug
   /usr/i686-w64-mingw32/sys-root/mingw/share/man/man8/virtlockd.8
   /usr/x86_64-w64-mingw32/sys-root/mingw/etc/libvirt/virtlockd.conf

/usr/x86_64-w64-mingw32/sys-root/mingw/share/augeas/lenses/tests/test_virtlockd.aug
   /usr/x86_64-w64-mingw32/sys-root/mingw/share/augeas/lenses/virtlockd.aug
   /usr/x86_64-w64-mingw32/sys-root/mingw/share/man/man8/virtlockd.8

* src/Makefile.am (CLEANFILES): Add virtlockd.8.
(man8_MANS, conf_DATA, augeas_DATA, augeastest_DATA): Only install
virtlockd files when daemon is built.
Signed-off-by: NEric Blake <eblake@redhat.com>

'make distcheck' was failing with:
make[3]: Entering directory `/home/eblake/libvirt-tmp2/libvirt-1.1.1/_build/docs'
perl ../../docs/genaclperms.pl ../../src/access/viraccessperm.h > ../../docs/aclperms.htmlinc
/bin/sh: ../../docs/aclperms.htmlinc: Permission denied

when simulating the case of a user doing a VPATH build from a
read-only source tree.  The culprit?  BUILT_SOURCES are _always_
built, and so must NOT be built into srcdir and need not be part
of the tarball.  On the other hand, shipped files must never
depend on files in the builddir.  While it would be possible to
fix the problem by generating aclperms.htmlinc into builddir,
we then have the problem that we ship acl.html - we'd have to
rejigger a lot of things to not ship pre-built html.  So this
patch goes the other direction - we don't need BUILT_SOURCES,
but instead ensure that we have proper dependencies so that
all files in srcdir are up-to-date at the time the tarball is
created.  And because we ship html files in the tarball, that
implies we don't expect users to be able to rebuild them, so
we must not clean any files that would trigger a rebuild except
under the maintainer rules.

* docs/Makefile.am (BUILT_SOURCES): Delete.
(CLEANFILES): Downgrade aclperms.htmlinc cleanup...
(maintainer-clean-local): ...and move hvsupport.html.in...
(MAINTAINERCLEANFILES): ...to a maintainer action.
(hvsupport.html.in): Write into srcdir.
(hvsupport.html): Ensure files are built in order.
(aclperms.htmlinc): Honor silent make.
(EXTRA_DIST): Ship aclperms.htmlinc.
Signed-off-by: NEric Blake <eblake@redhat.com>

With the 1.1.1 tarball, if a user does 'make && make distcheck',
things pass, but if they do 'make distcheck' after 'make clean',
there is an odd failure:

  GEN      ../../docs/devhelp/index.html
I/O error : Permission denied
I/O error : Permission denied
runtime error: file ../../docs/devhelp/devhelp.xsl line 43 element document
xsltDocumentElem: unable to save to ../../docs/devhelp/libvirt-virterror.html
I/O error : Permission denied
I/O error : Permission denied

This implies that the rules for 'make dist' are missing a
dependency - the generated documentation needs to be up-to-date
before creating the tarball, or else the tarball will be missing
files, where the end user will end up trying to rebuild files in
srcdir, and that fails when srcdir is read-only.

1.1.1 plus this patch now works without issues (other issues have
crept in to 1.1.2-rc1 that prevent 'make distcheck' from working,
but those will be cleaned up in later patches).

* docs/Makefile.am (dist-local): New dependency.
Signed-off-by: NEric Blake <eblake@redhat.com>

I noticed from an ./autobuild.sh run that we were installing a
virt-login-shell.exe binary when cross-building for mingw,
even though such a binary is necessarily worthless since the
code depends on lxc which is a Linux-only concept.

* tools/Makefile.am (conf_DATA, bin_PROGRAMS, dist_man1_MANS):
Make virt-login-shell installation conditional.
Signed-off-by: NEric Blake <eblake@redhat.com>

vhost only works in KVM mode at the moment, and is infact compiled
out if the emulator is built for non-native architecture. While it
may work at some point in the future for plain qemu, for now it's
just noise on the command line (and which contributes to arm cli
breakage).

Ubuntu libdbus.so links with -Bsymbolic-functions, which means
that we can only LD_PRELOAD functions that we directly call.
Functions which libdbus.so calls internally can not be replaced.
Thus we cannot use dbus_message_new_error or dbus_message_new_method_return
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

FreeBSD 10 recently changed their definition of RAND_MAX, to try
and cover the fact that their evenly distributed results of rand()
really are a smaller range than a full power of 2.  As a result,
I did some investigation, and learned:

1. POSIX requires random() to be evenly distributed across exactly
31 bits.  glibc also guarantees this for rand(), but the two are
unrelated, and POSIX only associates RAND_MAX with rand().
Avoiding RAND_MAX altogether thus avoids a build failure on
FreeBSD 10.

2. Concatenating random bits from a PRNG will NOT provide uniform
coverage over the larger value UNLESS the period of the original
PRNG is at least as large as the number of bits being concatenated.
Simple example: suppose that RAND_MAX were 1 with a period of 2**1
(which means that the PRNG merely alternates between 0 and 1).
Concatenating two successive rand() calls would then invariably
result in 01 or 10, which is a rather non-uniform distribution
(00 and 11 are impossible) and an even worse period (2**0, since
our second attempt will get the same number as our first attempt).
But a RAND_MAX of 1 with a period of 2**2 (alternating between
0, 1, 1, 0) provides sane coverage of all four values, if properly
tempered.  (Back-to-back calls would still only see half the values
if we don't do some tempering).  We therefore want to guarantee a
period of at least 2**64, preferably larger (as a tempering factor);
POSIX only makes this guarantee for random() with 256 bytes of info.

* src/util/virrandom.c (virRandomBits): Use constants that are
accurate for the PRNG we are using, not an unrelated PRNG.
(randomState): Ensure the period of our PRNG exceeds our usage.
Signed-off-by: NEric Blake <eblake@redhat.com>

Commit 29fe5d74 (released in 1.1.1) introduced a latent problem
for any caller of virSecurityManagerSetProcessLabel and where
the domain already had a uid:gid label to be parsed.  Such a
setup would collect the list of supplementary groups during
virSecurityManagerPreFork, but then ignores that information,
and thus fails to call setgroups() to adjust the supplementary
groups of the process.

Upstream does not use virSecurityManagerSetProcessLabel for
qemu (it uses virSecurityManagerSetChildProcessLabel instead),
so this problem remained latent until backporting the initial
commit into v0.10.2-maint (commit c061ff5e, released in 0.10.2.7),
where virSecurityManagerSetChildProcessLabel has not been
backported.  As a result of using a different code path in the
backport, attempts to start a qemu domain that runs as qemu:qemu
will end up with supplementary groups unchanged from the libvirtd
parent process, rather than the desired supplementary groups of
the qemu user.  This can lead to failure to start a domain
(typical Fedora setup assigns user 107 'qemu' to both group 107
'qemu' and group 36 'kvm', so a disk image that is only readable
under kvm group rights is locked out).  Worse, it is a security
hole (the qemu process will inherit supplemental group rights
from the parent libvirtd process, which means it has access
rights to files owned by group 0 even when such files should
not normally be visible to user qemu).

LXC does not use the DAC security driver, so it is not vulnerable
at this time.  Still, it is better to plug the latent hole on
the master branch first, before cherry-picking it to the only
vulnerable branch v0.10.2-maint.

* src/security/security_dac.c (virSecurityDACGetIds): Always populate
groups and ngroups, rather than only when no label is parsed.
Signed-off-by: NEric Blake <eblake@redhat.com>

The use of <> is a security issue for RPC parameters, since a
malicious client can set a huge array length causing arbitrary
memory allocation in the daemon.

It is also a robustness issue for RPC return values, because if
the stream is corrupted, it can cause the client to also allocate
arbitrary memory.

Use a syntax-check rule to prohibit any use of <>
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The return values for the virConnectListAllSecrets call were not
bounds checked. This is a robustness issue for clients if
something where to cause corruption of the RPC stream data.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The return values for the virConnectListAllNWFilters call were not
bounds checked. This is a robustness issue for clients if
something where to cause corruption of the RPC stream data.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The return values for the virConnectListAllNodeDevices call were not
bounds checked. This is a robustness issue for clients if
something where to cause corruption of the RPC stream data.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The return values for the virConnectListAllInterfaces call were not
bounds checked. This is a robustness issue for clients if
something where to cause corruption of the RPC stream data.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The return values for the virConnectListAllNetworks call were not
bounds checked. This is a robustness issue for clients if
something where to cause corruption of the RPC stream data.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The return values for the virStoragePoolListAllVolumes call were not
bounds checked. This is a robustness issue for clients if
something where to cause corruption of the RPC stream data.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>