In order to optionally take advantage of new features in dnsmasq when
the host's version of dnsmasq supports them, but still be able to run
on hosts that don't support the new features, we need to be able to
detect the version of dnsmasq running on the host, and possibly
determine from the help output what options are in this dnsmasq.
This patch implements a greatly simplified version of the capabilities
code we already have for qemu. A dnsmasqCaps device can be created and
populated either from running a program on disk, reading a file with
the concatenated output of "dnsmasq --version; dnsmasq --help", or
examining a buffer in memory that contains the concatenated output of
those two commands. Simple functions to retrieve capabilities flags,
the version number, and the path of the binary are also included.
bridge_driver.c creates a single dnsmasqCaps object at driver startup,
and disposes of it at driver shutdown. Any time it must be used, the
dnsmasqCapsRefresh method is called - it checks the mtime of the
binary, and re-runs the checks if the binary has changed.
networkxml2argvtest.c creates 2 "artificial" dnsmasqCaps objects at
startup - one "restricted" (doesn't support --bind-dynamic) and one
"full" (does support --bind-dynamic). Some of the test cases use one
and some the other, to make sure both code pathes are tested.
On OOM, xdr_destroy got called even though it wasn't created yet.
Found by coverity:
Error: UNINIT (CWE-457):
libvirt-0.10.2/src/rpc/virnetmessage.c:214: var_decl: Declaring
variable "xdr" without initializer.
libvirt-0.10.2/src/rpc/virnetmessage.c:219: cond_true: Condition
"virReallocN(&msg->buffer, 1UL /* sizeof (*msg->buffer) */,
msg->bufferLength) < 0", taking true branch
libvirt-0.10.2/src/rpc/virnetmessage.c:221: goto: Jumping to label
"cleanup"
libvirt-0.10.2/src/rpc/virnetmessage.c:257: label: Reached label
"cleanup"
libvirt-0.10.2/src/rpc/virnetmessage.c:258: uninit_use: Using
uninitialized value "xdr.x_ops".
Found by coverity:
Error: SIZEOF_MISMATCH (CWE-569):
libvirt-0.10.2/tools/virsh-domain.c:4754: suspicious_sizeof: Passing
argument "8UL /* sizeof (cpumap) */" to function
"_vshCalloc(vshControl *, size_t, size_t, char const *, int)" and
then casting the return value to "unsigned char *" is suspicious.
Error: SIZEOF_MISMATCH (CWE-569):
libvirt-0.10.2/tools/virsh-domain.c:4942: suspicious_sizeof: Passing
argument "8UL /* sizeof (cpumap) */" to function
"_vshCalloc(vshControl *, size_t, size_t, char const *, int)" and
then casting the return value to "unsigned char *" is suspicious.
Found by coverity:
Error: REVERSE_INULL (CWE-476):
libvirt-0.10.2/src/util/processinfo.c:141: deref_ptr: Directly
dereferencing pointer "map".
libvirt-0.10.2/src/util/processinfo.c:142: check_after_deref:
Null-checking "map" suggests that it may be null, but it has already
been dereferenced on all paths leading to the check.
Found by coverity:
Error: REVERSE_INULL (CWE-476):
libvirt-0.10.2/src/conf/netdev_bandwidth_conf.c:99: deref_ptr:
Directly dereferencing pointer "node".
libvirt-0.10.2/src/conf/netdev_bandwidth_conf.c:107:
check_after_deref: Null-checking "node" suggests that it may be
null, but it has already been dereferenced on all paths leading to
the check.
The virStateInitialize method and several cgroups methods were
using an 'int privileged' parameter or similar for dual-state
values. These are better represented with the bool type.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
To allow actions to be performed in libvirtd when the host
shuts down, or user session exits, introduce a 'stop'
method to virDriverState. This will do things like saving
the VM state to a file.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Implement the new API for sending signals to processes in a guest
for the LXC driver. Only support sending signals to the init
process for now, because
- The kernel does not appear to expose the mapping between
container PID numbers and host PID numbers anywhere in the
host OS namespace
- There is no race-free way to validate whether a host PID
corresponds to a process in a container.
* src/lxc/lxc_driver.c: Allow sending processes signals
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
* src/remote/remote_protocol.x: message definition
* src/remote/remote_driver.c: Register driver function
* src/remote_protocol-structs: Test case
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Add an API for sending signals to arbitrary processes in the
guest OS. This is primarily useful for container based virt,
but can be used for machine virt too, if there is a suitable
guest agent,
* include/libvirt/libvirt.h.in: Add virDomainSendProcessSignal
and virDomainProcessSignal enum
* src/driver.h: Driver entry point
* src/libvirt.c, src/libvirt_public.syms: Impl for new API
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
As of 1a50ba2cb0 we fail to connect to the
monitor instead of getting an exit status != 0 from qemu itself. This
breaks capabilities probing for the non QMP case.
The documentation to this API has some defects from
grammar and wording POV. These were raised after I've
pushed the patches, so they are in a separate commit.
It makes no sense to fail the whole getting command if there is
a parameter unsupported by the kernel. This patch fixes it by
omitting the unsupported parameter for getMemoryParameters.
And for setMemoryParameters, this checks if there is an unsupported
parameter up front of the setting, and just returns failure if not
all parameters are supported.
Replace the following names
* struct qemu_snap_remove with virQEMUSnapRemovePtr
* struct qemu_snap_reparent with virQEMUSnapReparentPtr
* struct qemu_save_header with virQEMUSaveHeaderPtr
* enum qemu_save_formats with virQEMUSaveFormat
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Remove the obsolete 'qemud' naming prefix and underscore
based type name. Introduce virQEMUDriverPtr as the replacement,
in common with LXC driver naming style
This resolves: https://bugzilla.redhat.com/show_bug.cgi?id=879473
The name attribute is required for portgroup elements (yes, the RNG
specifies that), and there is code in libvirt that assumes it is
non-null. Unfortunately, the portgroup parsing function wasn't
checking for lack of portgroup. One adverse result of this was that
attempts to update a network by adding a portgroup with no name would
cause libvirtd to segfault. For example:
virsh net-update default add portgroup "<portgroup default='yes'/>"
This patch causes virNetworkPortGroupParseXML to fail if no name is
specified, thus avoiding any later problems.
Throughout the code, we've always used VIR_DOMAIN_SHUTDOWN* flags
even for virDomainReboot() API and its implementation. Fortunately,
the appropriate macros has the same value. But if we want to keep
things consistent, we should be using the correct macros. This
patch doesn't break anything, luckily.
Commit cb022152 went overboard and introduced a dead conditional
while trying to get rid of a potential NULL dereference.
* src/nwfilter/nwfilter_dhcpsnoop.c (virNWFilterSnoopReqNew):
Remove redundant conditional.
In a few places, the return value could get passed to VIR_ALLOC_N without
being checked, resulting in a request to allocate a lot of memory if the
return value was negative.
This can't lead to a crash since virNWFilterSnoopReqNew is only called
with a static array as the argument, but if we check for NULL we should
do it right.
Error messages produced while dispatching guest agent commands didn't
have an apparent reference to the fact that they are dealing with guest
agent commands. This patch fixes up some of the messages to contain that
reference.
Just a little rewrite of the cmdDomDisplay function to make it
consistent and hopefully more readable. This also fixes a problem
with password not being displayed for vnc even with the
"--include-password" option.
using qemu guest agent. As said in previous patch,
@mountPoint must be NULL and @flags zero because
qemu guest agent doesn't support these arguments
yet. If qemu learns them, we can start supporting
them as well.
This will call FITRIM within guest. The API has 4 arguments,
however, only 2 will be used for now (@dom and @minumum).
The rest two are there if in future qemu guest agent learns them.
With QMP capability probing, the version was not set.
virsh version returns:
...
Cannot extract running QEMU hypervisor version
This is fixed by computing caps->version from QMP major,
minor, micro values.
Signed-off-by: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
QMP Capability probing will fail if QEMU cannot bind to the
QMP monitor socket in the qemu_driver->libDir directory.
That's because the child process is stripped of all
capabilities and this directory is chown'ed to the configured
QEMU user/group (normally qemu:qemu) by the QEMU driver.
To prevent this from happening, the driver startup will now pass
the QEMU uid and gid down to the capability probing code.
All capability probing invocations of QEMU will be run with
the configured QEMU uid instead of libvirtd's.
Furter, the pid file handling is moved to libvirt, as QEMU
cannot write to the qemu_driver->runDir (root:root). This also
means that the libvirt daemonizing must be used.
Signed-off-by: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
If qemuMonitorOpenUnix is called without a related pid, i.e. for
QMP probing, a connect failure can happen as the result of a race.
Without a pid there is no retry and thus we give up too early.
This changes the code to retry if no pid is supplied.
Signed-off-by: Viktor Mihajlovski <mihajlov@linux.vnet.ibm.com>
we already have virtualize meminfo for container through fuse filesystem,
add function lxcContainerMountProcFuse to mount this meminfo file to
the container's /proc/meminfo.
So we can isolate container's /proc/meminfo from host now.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
with this patch,container's meminfo will be shown based on
containers' mem cgroup.
Right now,it's impossible to virtualize all values in meminfo,
I collect some values such as MemTotal,MemFree,Cached,Active,
Inactive,Active(anon),Inactive(anon),Active(file),Inactive(anon),
Active(file),Inactive(file),Unevictable,SwapTotal,SwapFree.
if I miss something, please let me know.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
because libvirt_lxc's cgroup mountpoint is what it shown
in /proc/self/cgroup.
we can get container's cgroup through virCgroupNew("/", &group),
add interface virCgroupGetAppRoot to help container to
get it's cgroup.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
virCgroupGetMemSwapUsage is used to get container's swap usage,
with this interface,we can get swap usage in fuse filesystem.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
this patch addes fuse support for libvirt lxc.
we can use fuse filesystem to generate sysinfo dynamically,
So we can isolate /proc/meminfo,cpuinfo and so on through
fuse filesystem.
we mount fuse filesystem for every container.
the mount name is libvirt,mount point is
localstatedir/run/libvirt/lxc/containername.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
This bug leads to getting incorrect vcpupin information via
qemudDomainGetVcpuPinInfo() API when the number of maximum
cpu on a host falls into a range such as 31 < ncpus < 64.
gcc warning:
left shift count >= width of type
The following bug is such the case
https://bugzilla.redhat.com/show_bug.cgi?id=876415
