* src/util/bridge.c, src/util/bridge.h: Add virNetDevGetMAC

The MTU management APIs are useful to other code inside libvirt,
so should be exposed as non-static APIs.

* src/util/bridge.c, src/util/bridge.h: Expose virNetDevSetMTU,
  virNetDevSetMTUFromDevice & virNetDevGetMTU

* src/util/bridge.c, src/util/bridge.h: s/int/bool/ in
  virNetDevSetOnline and virNetDevBridgeSetSTP

The existing brXXX APIs in src/util/bridge.h are renamed to
follow one of three different conventions

 - virNetDevXXX       - operations for any type of interface
 - virNetDevBridgeXXX - operations for bridge interfaces
 - virNetDevTapXXX    - operations for tap interfaces

* src/util/bridge.h, src/util/bridge.c: Rename all APIs
* src/lxc/lxc_driver.c, src/network/bridge_driver.c,
  src/qemu/qemu_command.c, src/uml/uml_conf.c,
  src/uml/uml_driver.c: Update for API renaming

Currently every caller of the brXXX APIs has to store the returned
errno value and then raise an error message. This results in
inconsistent error messages across drivers, additional burden on
the callers and makes the error reporting inaccurate since it is
hard to distinguish different scenarios from 1 errno value.

* src/util/bridge.c: Raise errors instead of returning errnos
* src/lxc/lxc_driver.c, src/network/bridge_driver.c,
  src/qemu/qemu_command.c, src/uml/uml_conf.c,
  src/uml/uml_driver.c: Remove error reporting code

The bridge management APIs in src/util/bridge.c require a brControl
object to be passed around. This holds the file descriptor for the
control socket. This extra object complicates use of the API for
only a minor efficiency gain, which is in turn entirely offset by
the need to fork/exec the brctl command for STP configuration.

This patch removes the 'brControl' object entirely, instead opening
the control socket & closing it again within the scope of each method.

The parameter names for the APIs are also made to consistently use
'brname' for bridge device name, and 'ifname' for an interface
device name. Finally annotations are added for non-NULL parameters
and return check validation

* src/util/bridge.c, src/util/bridge.h: Remove brControl object
  and update API parameter names & annotations.
* src/lxc/lxc_driver.c, src/network/bridge_driver.c,
  src/uml/uml_conf.h, src/uml/uml_conf.c, src/uml/uml_driver.c,
  src/qemu/qemu_command.c, src/qemu/qemu_conf.h,
  src/qemu/qemu_driver.c: Remove reference to 'brControl' object

MacOS lacks ptsname_r, and gnulib doesn't (yet) provide it.
But we can avoid it altogether, by using gnulib openpty()
instead.  Note that we do _not_ want the pt_chown module;
gnulib uses it only to implement a replacement openpty() if
the system lacks both openpty() and granpt(), but all
systems that we currently port to either have at least one of
openpty() and/or grantpt(), or lack ptys altogether.  That is,
we aren't porting to any system that requires us to deal with
the hassle of installing a setuid pt_chown helper just to use
gnulib's ability to provide openpty() on obscure platforms.

* .gnulib: Update to latest, for openpty fixes
* bootstrap.conf (gnulib_modules): Add openpty, ttyname_r.
(gnulib_tool_option_extras): Exclude pt_chown module.
* src/util/util.c (virFileOpenTty): Rewrite in terms of openpty
and ttyname_r.
* src/util/util.h (virFileOpenTtyAt): Delete dead prototype.

Building on 64-bit FreeBSD 8.2 complained about a cast between
a pointer and a smaller integer.  Going through an intermediate
cast shuts up the compiler.

* src/util/threads-pthread.c (virThreadSelfID): Silence a warning.

The field 'mon' in 'struct tm' gives months 0-11, where as
humans tend to expect months 1-12. Thus the month number
needing adjusting by 1

* src/util/logging.c: Use human friendly month number

commit 27908453 introduces a regression, and it will
cause libvirt crashed when starting network.

The reason is that tapfd may be NULL, but we dereference
it without checking whether it is NULL.

To support "managed" mode of host PCI device, we record the original
states (unbind_from_stub, remove_slot, and reprobe) so that could
reattach the device to host with original driver. But there is no XML
for theses attrs, and thus after daemon is restarted, we lose the
original states. It's easy to reproduce:

    1) virsh start domain
    2) virsh attach-device dom hostpci.xml (in 'managed' mode)
    3) service libvirtd restart
    4) virsh destroy domain

    You will see the device won't be bound to the original driver
if there was one.

This patch is to solve the problem by introducing internal XML
(won't be dumped to user, only dumped to status XML). The XML is:
    <origstates>
      <unbind/>
      <remove_slot/>
      <reprobe/>
    </origstates>

Which will be child node of <hostdev><source>...</souce></hostdev>.
(only for PCI device).

A new struct "virDomainHostdevOrigStates" is introduced for the XML,
and the according members are updated when preparing the PCI device.
And function "qemuUpdateActivePciHostdevs" is modified to honor
the original states. Use of qemuGetPciHostDeviceList is removed
in function "qemuUpdateActivePciHostdevs", and the "managed" value of
the device config is honored by the change. This fixes another problem
alongside:

    qemuGetPciHostDeviceList set the device as "managed" force
    regardless of whether the device is configured as "managed='yes'"
    or not in XML, which is not right.

- changed some return 1's to return -1
- changed if (rc) error checks to if (rc < 0)
- fixed some other minor convention violations

I might have missed some. Can fix in another patch or can respin
Signed-off-by: NRoopa Prabhu <roprabhu@cisco.com>
Reported-by: NEric Blake <eblake@redhat.com>
Reported-by: NLaine Stump <laine@laine.org>
Signed-off-by: NEric Blake <eblake@redhat.com>

It forgets to move a pointer to a buffer for UUID and as a result
fills only the first byte of the buffer.

This refactors the TAP creation code out of brAddTap into a new
function brCreateTap to allow it to be used on its own. I have also
changed ifSetInterfaceMac to brSetInterfaceMac and exported it since
it is will be needed by code outside of util/bridge.c in the next
patch.

 AUTHORS                 |    1 +
 src/libvirt_bridge.syms |    2 +
 src/util/bridge.c       |  116 +++++++++++++++++++++++++++++++----------------
 src/util/bridge.h       |    9 ++++
 4 files changed, 89 insertions(+), 39 deletions(-)

Every time we write XML into a file we call virEmitXMLWarning to write a
warning that the file is automatically generated. virXMLSaveFile
simplifies this into a single step and makes rewriting existing XML file
safe by using virFileRewrite internally.

When saving config files we just overwrite old content of the file. In
case something fails during that process (e.g. disk gets full) we lose
both old and new content. This patch makes the process more robust by
writing the new content into a separate file and only if that succeeds
the original file is atomically replaced with the new one.

* src/util/util.c: s/git_t/gid_t/ in parameter list of virFileAccessibleAs

This function checks if a given path is accessible under
given uid and gid.

More simplifications possible due to auto-indent.  Also,
<bandwidth> within <actual> was only using 6 instead of 8 spaces.

* src/util/network.h (virVirtualPortProfileFormat)
(virBandwidthDefFormat): Alter signature.
* src/util/network.c (virVirtualPortProfileFormat)
(virBandwidthDefFormat): Alter indentation.
(virBandwidthChildDefFormat): Tweak to make use easier.
* src/conf/network_conf.c (virPortGroupDefFormat)
(virNetworkDefFormat): Adjust callers.
* src/conf/domain_conf.c (virDomainNetDefFormat): Likewise.
(virDomainActualNetDefFormat): Likewise, and fix bandwidth
indentation.

The improvements to virBuffer, along with a paradigm shift to pass
the original buffer through rather than creating a second buffer,
allow us to shave off quite a few lines of code.

* src/util/sysinfo.h (virSysinfoFormat): Alter signature.
* src/util/sysinfo.c (virSysinfoFormat, virSysinfoBIOSFormat)
(virSysinfoSystemFormat, virSysinfoProcessorFormat)
(virSysinfoMemoryFormat): Change indentation parameter.
* src/conf/domain_conf.c (virDomainSysinfoDefFormat): Adjust
caller.
* src/qemu/qemu_driver.c (qemuGetSysinfo): Likewise.

Rather than having to adjust all callers in a chain to deal with
indentation, it is nicer to have virBuffer do auto-indentation.

* src/util/buf.h (_virBuffer): Increase size.
(virBufferAdjustIndent, virBufferGetIndent): New prototypes.
* src/libvirt_private.syms (buf.h): Export new functions.
* src/util/buf.c (virBufferAdjustIndent, virBufferGetIndent): New
functions.
(virBufferSetError, virBufferAdd, virBufferAddChar)
(virBufferVasprintf, virBufferStrcat, virBufferURIEncodeString):
Implement auto-indentation.
* tests/virbuftest.c (testBufAutoIndent): Test it.
(testBufInfiniteLoop): Don't rely on internals.
Idea by Daniel P. Berrange.

The next patch wants to add some sanity checking, which would
be a different error than ENOMEM.  Many existing callers blindly
report OOM failure if virBuf reports an error, and this will be
wrong in the (unlikely) case that they actually had a usage error
instead; but since the most common error really is ENOMEM, I'm
not going to fix all callers.  Meanwhile, new discriminating
callers can react differently depending on what failure happened.

* src/util/buf.c (virBufferSetError): Add parameter.
(virBufferGrow, virBufferVasprintf, virBufferEscapeString)
(virBufferEscapeSexpr, virBufferEscapeShell): Adjust callers.

Although the compiler wasn't complaining (since it was the pointer,
rather than what was being pointed to, that was actually const), it
looks quite suspicious to call a function with an argument labeled
const when the nature of the pointer (virBufferPtr) is hidden behind
a typedef.  Dropping const makes the function declarations easier
to read.

* src/util/buf.h: Drop const from all functions that modify buffer
argument.
* src/util/buf.c (virBufferSetError, virBufferAdd)
(virBufferContentAndReset, virBufferFreeAndReset)
(virBufferAsprintf, virBufferVasprintf, virBufferEscapeString)
(virBufferEscapeSexpr, virBufferEscape): Fix fallout.

Stub out a complete impl of virFileOpenTty to avoid unused
parameter warnings

* src/util/util.c: Fix virFileOpenTty on Win32

The glibc ones (intentionally) cannot handle ptys opened in a
devpts not mounted at /dev/pts.

Drop the (un-exported, unused) virFileOpenTtyAt.
Signed-off-by: NSerge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: NEric Blake <eblake@redhat.com>

The statement

        virBufferAdd(buf, "''", 2);

triggers a syntax-check warning

* src/util/buf.c: Replace virBufferAdd with virBufferAddLit

This adds support for a libvirt client configuration file
either /etc/libvirt/libvirt.conf for privileged clients,
or $HOME/.libvirt/libvirt.conf for unprivileged clients.

It allows one parameter

 uri_aliases = [
   "hail=qemu+ssh://root@hail.cloud.example.com/system",
   "sleet=qemu+ssh://root@sleet.cloud.example.com/system",
 ]

Any call to virConnectOpen with a non-NULL URI will first
attempt to match against the uri_aliases list. An application
can disable this by using VIR_CONNECT_NO_ALIASES

* docs/uri.html.in: Document URI aliases
* include/libvirt/libvirt.h.in: Add VIR_CONNECT_NO_ALIASES
* libvirt.spec.in, mingw32-libvirt.spec.in: Add /etc/libvirt/libvirt.conf
* src/Makefile.am: Install default config file
* src/libvirt.c: Add support for URI aliases
* src/remote/remote_driver.c: Don't try to handle URIs
  with no scheme and which clearly are not paths
* src/util/conf.c: Don't raise error on virConfFree(NULL)
* src/xen/xen_driver.c: Don't raise error on URIs
  with no scheme

Make the empty string return '' to match cmdEcho's behavior.

When checking if we need to escape a single quote we were looking at the
character after the quote instead of at the quote itself.

Check strdup return value and fail if error
Signed-off-by: NRoopa Prabhu <roprabhu@cisco.com>

Commit 0472f39f plugged a leak, but introduced another bug:

Actually looks like physfndev is conditionally allocated in getPhysfnDev
Its better to modify getPhysfnDev to allocate physfndev every time.

When failing on starting a domain, it tries to reattach all the PCI
devices defined in the domain conf, regardless of whether the devices
are still used by other domain. This will cause the devices to be deleted
from the list qemu_driver->activePciHostdevs, thus the devices will be
thought as usable even if it's not true. And following commands
nodedev-{reattach,reset} will be successful.

How to reproduce:
  1) Define two domains with same PCI device defined in the confs.
  2) # virsh start domain1
  3) # virsh start domain2
  4) # virsh nodedev-reattach $pci_device

You will see the device will be reattached to host successfully.
As pciDeviceReattach just check if the device is still used by
other domain via checking if the device is in list driver->activePciHostdevs,
however, the device is deleted from the list by step 2).

This patch is to prohibit the bug by:
  1) Prohibit a domain starting or device attachment right at
     preparation period (qemuPrepareHostdevPCIDevices) if the
     device is in list driver->activePciHostdevs, which means
     it's used by other domain.

  2) Introduces a new field for struct _pciDevice, (const char *used_by),
     it will be set as the domain name at preparation period,
     (qemuPrepareHostdevPCIDevices). Thus we can prohibit deleting
     the device from driver->activePciHostdevs if it's still used by
     other domain when stopping the domain process.

* src/pci.h (define two internal functions, pciDeviceSetUsedBy and
    pciDevceGetUsedBy)
* src/pci.c (new field "const char *used_by" for struct _pciDevice,
    implementations for the two new functions)
* src/libvirt_private.syms (Add the two new internal functions)
* src/qemu_hostdev.h (Modify the definition of functions
    qemuPrepareHostdevPCIDevices, and qemuDomainReAttachHostdevDevices)
* src/qemu_hostdev.c (Prohibit preparation and don't delete the
    device from activePciHostdevs list if it's still used by other domain)
* src/qemu_hotplug.c (Update function usage, as the definitions are
    changed)
Signed-off-by: NEric Blake <eblake@redhat.com>

Detected by Coverity.  Leak present since commit ca3b22bb.

* src/util/macvtap.c (doPortProfileOp8021Qbh): Release device name.

Escape strings so they're safe to pass to the shell. It's based on
virsh's cmdEcho.

Setting a hostname that cannot be resolved is not the best configuration
but since virGetHostname only calls getaddrinfo to get host's canonical
name and we do not fail if the returned canonical name is NULL or
"localhost", there is no reason why we should fail if getaddrinfo itself
fails.

Coverity complained that most, but not all, clients of virUUIDParse
were checking for errors.  Silence those coverity warnings by
explicitly marking the cases where we trust the input, and fixing
one instance that really should have been checking.  In particular,
this silences a rather large percentage of the warnings I saw on my
most recent Coverity analysis run.

* src/util/uuid.h (virUUIDParse): Enforce rules.
* src/util/uuid.c (virUUIDParse): Drop impossible check; at least
Coverity will detect if we break rules and pass NULL.
* src/xenapi/xenapi_driver.c (xenapiDomainCreateXML)
(xenapiDomainLookupByID, xenapiDomainLookupByName)
(xenapiDomainDefineXML): Ignore return when we trust data source.
* src/vbox/vbox_tmpl.c (nsIDtoChar, vboxIIDToUUID_v3_x)
(vboxCallbackOnMachineStateChange)
(vboxCallbackOnMachineRegistered, vboxStoragePoolLookupByName):
Likewise.
* src/node_device/node_device_hal.c (gather_system_cap): Likewise.
* src/xenxs/xen_sxpr.c (xenParseSxpr): Check for errors.

virCommandTransferFD promises that the fd is no longer owned by
the caller.  Normally, we want the fd to remain open until the
child runs, but in error situations, we must close it earlier.

* src/util/command.c (virCommandTransferFD): Close fd now if we
can't track it to close later.
(virCommandKeepFD): Adjust helper to make this easier.

Implement a generic helper to escape a given set of characters with a
leading '\'.  Generalizes virBufferEscapeSexpr().
Signed-off-by: NSage Weil <sage@newdream.net>

The libvirtd daemon had a few crude system tap probes. Some of
these were broken during the RPC rewrite. The new modular RPC
code is structured in a way that allows much more effective
tracing. Instead of trying to hook up the original probes,
define a new set of probes for the RPC and event code.

The master probes file is now src/probes.d.  This contains
probes for virNetServerClientPtr, virNetClientPtr, virSocketPtr
virNetTLSContextPtr and virNetTLSSessionPtr modules. Also add
probes for the poll event loop.

The src/dtrace2systemtap.pl script can convert the probes.d
file into a libvirt_probes.stp file to make use from systemtap
much simpler.

The src/rpc/gensystemtap.pl script can generate a set of
systemtap functions for translating RPC enum values into
printable strings. This works for all RPC header enums (program,
type, status, procedure) and also the authentication enum

The PROBE macro will automatically generate a VIR_DEBUG
statement, so any place with a PROBE can remove any existing
manual DEBUG statements.

* daemon/libvirtd.stp, daemon/probes.d: Remove obsolete probing
* daemon/libvirtd.h: Remove probe macros
* daemon/Makefile.am: Remove all probe buildings/install
* daemon/remote.c: Update authentication probes
* src/dtrace2systemtap.pl, src/rpc/gensystemtap.pl: Scripts
  to generate STP files
* src/internal.h: Add probe macros
* src/probes.d: Master list of probes
* src/rpc/virnetclient.c, src/rpc/virnetserverclient.c,
  src/rpc/virnetsocket.c, src/rpc/virnettlscontext.c,
  src/util/event_poll.c: Insert probe points, removing any
  DEBUG statements that duplicate the info