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2021-08-09qga: fix leak of base64 decoded data on command errorDaniel P. Berrangé
If the guest command fails to be spawned, then we would leak the decoded base64 input used for the command's stdin feed. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Michael Roth <michael.roth@amd.com>
2021-03-16qga: Add spaces around operatorAlexChen
Reported-by: Euler Robot <euler.robot@huawei.com> Signed-off-by: AlexChen <alex.chen@huawei.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> *fix 80+ char violation while we're here *fix w32 build breakage from changing INVALID_SET_FILE_POINTER definition from a cast to a subtraction Signed-off-by: Michael Roth <michael.roth@amd.com>
2020-12-19qapi: Use QAPI_LIST_PREPEND() where possibleEric Blake
Anywhere we create a list of just one item or by prepending items (typically because order doesn't matter), we can use QAPI_LIST_PREPEND(). But places where we must keep the list in order by appending remain open-coded until later patches. Note that as a side effect, this also performs a cleanup of two minor issues in qga/commands-posix.c: the old code was performing new = g_malloc0(sizeof(*ret)); which 1) is confusing because you have to verify whether 'new' and 'ret' are variables with the same type, and 2) would conflict with C++ compilation (not an actual problem for this file, but makes copy-and-paste harder). Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <20201113011340.463563-5-eblake@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Acked-by: Stefan Hajnoczi <stefanha@redhat.com> [Straightforward conflicts due to commit a8aa94b5f8 "qga: update schema for guest-get-disks 'dependents' field" and commit a10b453a52 "target/mips: Move mips_cpu_add_definition() from helper.c to cpu.c" resolved. Commit message tweaked.] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2020-09-23qemu/atomic.h: rename atomic_ to qatomic_Stefan Hajnoczi
clang's C11 atomic_fetch_*() functions only take a C11 atomic type pointer argument. QEMU uses direct types (int, etc) and this causes a compiler error when a QEMU code calls these functions in a source file that also included <stdatomic.h> via a system header file: $ CC=clang CXX=clang++ ./configure ... && make ../util/async.c:79:17: error: address argument to atomic operation must be a pointer to _Atomic type ('unsigned int *' invalid) Avoid using atomic_*() names in QEMU's atomic.h since that namespace is used by <stdatomic.h>. Prefix QEMU's APIs with 'q' so that atomic.h and <stdatomic.h> can co-exist. I checked /usr/include on my machine and searched GitHub for existing "qatomic_" users but there seem to be none. This patch was generated using: $ git grep -h -o '\<atomic\(64\)\?_[a-z0-9_]\+' include/qemu/atomic.h | \ sort -u >/tmp/changed_identifiers $ for identifier in $(</tmp/changed_identifiers); do sed -i "s%\<$identifier\>%q$identifier%g" \ $(git grep -I -l "\<$identifier\>") done I manually fixed line-wrap issues and misaligned rST tables. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20200923105646.47864-1-stefanha@redhat.com>
2020-07-13qga: Use qemu_get_host_name() instead of g_get_host_name()Michal Privoznik
Problem with g_get_host_name() is that on the first call it saves the hostname into a global variable and from then on, every subsequent call returns the saved hostname. Even if the hostname changes. This doesn't play nicely with guest agent, because if the hostname is acquired before the guest is set up (e.g. on the first boot, or before DHCP) we will report old, invalid hostname. Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1845127 Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Cc: qemu-stable@nongnu.org Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2020-04-15qga: Restrict guest-file-read count to 48 MB to avoid crashesPhilippe Mathieu-Daudé
On [*] Daniel Berrangé commented: The QEMU guest agent protocol is not sensible way to access huge files inside the guest. It requires the inefficient process of reading the entire data into memory than duplicating it again in base64 format, and then copying it again in the JSON serializer / monitor code. For arbitrary general purpose file access, especially for large files, use a real file transfer program or use a network block device, not the QEMU guest agent. To avoid bug reports as BZ#1594054 (CVE-2018-12617), follow his suggestion to put a low, hard limit on "count" in the guest agent QAPI schema, and don't allow count to be larger than 48 MB. [*] https://www.mail-archive.com/qemu-devel@nongnu.org/msg693176.html Fixes: CVE-2018-12617 Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1594054 Reported-by: Fakhri Zulkifli <mohdfakhrizulkifli@gmail.com> Suggested-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> *update schema documentation to indicate 48MB limit instead of 10MB Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2020-04-15qga: Extract qmp_guest_file_read() to common commands.cPhilippe Mathieu-Daudé
Extract the common code shared by both POSIX/Win32 implementations. Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2020-03-24qga: Fix undefined C behaviorEric Blake
The QAPI struct GuestFileWhence has a comment about how we are exploiting equivalent values between two different integer types shared in a union. But C says behavior is undefined on assignments to overlapping storage when the two types are not the same width, and indeed, 'int64_t value' and 'enum QGASeek name' are very likely to be different in width. Utilize a temporary variable to fix things. Reported-by: Peter Maydell <peter.maydell@linaro.org> Fixes: 0b4b49387 Fixes: Coverity CID 1421990 Signed-off-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2020-03-17qmp: constify QmpCommand and listMarc-André Lureau
Since 0b69f6f72ce47a37a749b056b6d5ec64c61f11e8 "qapi: remove qmp_unregister_command()", the command list can be declared const. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Damien Hedde <damien.hedde@greensocs.com> Message-Id: <20200316171824.2319695-1-marcandre.lureau@redhat.com> [Rebased] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2019-12-18qga: rename Error ** parameter to more common errpVladimir Sementsov-Ogievskiy
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20191205174635.18758-13-vsementsov@virtuozzo.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Markus Armbruster <armbru@redhat.com>
2018-06-29glib: bump min required glib library version to 2.40Daniel P. Berrangé
Per supported platforms doc[1], the various min glib on relevant distros is: RHEL-7: 2.50.3 Debian (Stretch): 2.50.3 Debian (Jessie): 2.42.1 OpenBSD (Ports): 2.54.3 FreeBSD (Ports): 2.50.3 OpenSUSE Leap 15: 2.54.3 SLE12-SP2: 2.48.2 Ubuntu (Xenial): 2.48.0 macOS (Homebrew): 2.56.0 This suggests that a minimum glib of 2.42 is a reasonable target. The GLibC compile farm, however, uses Ubuntu 14.04 (Trusty) which only has glib 2.40.0, and this is needed for testing during merge. Thus an exception is made to the documented platform support policy to allow for all three current LTS releases to be supported. Docker jobs that not longer satisfy this new min version are removed. [1] https://qemu.weilnetz.de/doc/qemu-doc.html#Supported-build-platforms Reviewed-by: Thomas Huth <thuth@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
2018-06-01qga: use local path for local headersMichael S. Tsirkin
When pulling in headers that are in the same directory as the C file (as opposed to one in include/), we should use its relative path, without a directory. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
2018-03-02qapi: Move qapi-schema.json to qapi/, rename generated filesMarkus Armbruster
Move qapi-schema.json to qapi/, so it's next to its modules, and all files get generated to qapi/, not just the ones generated for modules. Consistently name the generated files qapi-MODULE.EXT: qmp-commands.[ch] become qapi-commands.[ch], qapi-event.[ch] become qapi-events.[ch], and qmp-introspect.[ch] become qapi-introspect.[ch]. This gets rid of the temporary hacks in scripts/qapi/commands.py, scripts/qapi/events.py, and scripts/qapi/common.py. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180211093607.27351-28-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> [eblake: Fix trailing dot in tpm.c, undo temporary hack for OSX toolchain] Signed-off-by: Eric Blake <eblake@redhat.com>
2018-02-09Include qapi/error.h exactly where neededMarkus Armbruster
This cleanup makes the number of objects depending on qapi/error.h drop from 1910 (out of 4743) to 1612 in my "build everything" tree. While there, separate #include from file comment with a blank line, and drop a useless comment on why qemu/osdep.h is included first. Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <20180201111846.21846-5-armbru@redhat.com> [Semantic conflict with commit 34e304e975 resolved, OSX breakage fixed]
2017-06-20qapi: merge QInt and QFloat in QNumMarc-André Lureau
We would like to use a same QObject type to represent numbers, whether they are int, uint, or floats. Getters will allow some compatibility between the various types if the number fits other representations. Add a few more tests while at it. Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20170607163635.17635-7-marcandre.lureau@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [parse_stats_intervals() simplified a bit, comment in test_visitor_in_int_overflow() tidied up, suppress bogus warnings] Signed-off-by: Markus Armbruster <armbru@redhat.com>
2017-04-27qga: Add `guest-get-timezone` commandVinzenz Feenstra
Adds a new command `guest-get-timezone` reporting the currently configured timezone on the system. The information on what timezone is currently is configured is useful in case of Windows VMs where the offset of the hardware clock is required to have the same offset. This can be used for management systems like `oVirt` to detect the timezone difference and warn administrators of the misconfiguration. Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com> Reviewed-by: Sameeh Jubran <sameeh@daynix.com> Tested-by: Sameeh Jubran <sameeh@daynix.com> * moved stub implementation to end of function for consistency * document that timezone names are for informational use only. Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2017-04-26qga: Add 'guest-get-host-name' commandVinzenz Feenstra
Retrieving the guest host name is a very useful feature for virtual management systems. This information can help to have more user friendly VM access details, instead of an IP there would be the host name. Also the host name reported can be used to have automated checks for valid SSL certificates. virsh # qemu-agent-command F25 '{ "execute": "guest-get-host-name" }' {"return":{"host-name":"F25.lab.evilissimo.net"}} Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com> * minor whitespace fix-ups Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2017-03-05qapi: Support multiple command registries per programMarkus Armbruster
The command registry encapsulates a single command list. Give the functions using it a parameter instead. Define suitable command lists in monitor, guest agent and test-qmp-commands. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1488544368-30622-6-git-send-email-armbru@redhat.com> [Debugging turds buried] Reviewed-by: Eric Blake <eblake@redhat.com>
2016-10-04qga/command: use QEMU atomic primitivesAlex Bennée
The guest client's use of the glib's g_atomic primitives causes newer GCC's to barf when built on Travis. As QEMU has its own primitives with well understood semantics we might as well use them. The use of atomics was a little inconsistent so I've also ensure the values are correctly set with atomic primitives at the same time. I also made the usage of bool consistent while I was at it. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20160930213106.20186-12-alex.bennee@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-06-07qga: Remove unnecessary glib.h includesPeter Maydell
Remove glib.h includes, as it is provided by osdep.h. This commit was created with scripts/clean-includes. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Eric Blake <eblake@redhat.com> Tested-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2016-05-18Fix some typos found by codespellStefan Weil
Signed-off-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2016-04-07qga: fix fd leak with guest-exec i/o channelsYuriy Pudgorodskiy
Signed-off-by: Yuriy Pudgorodskiy <yur@virtuozzo.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Michael Roth <mdroth@linux.vnet.ibm.com> * squashed in g_io_channel_shutdown() to match cleanup paths for input/output Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2016-03-22util: move declarations out of qemu-common.hVeronia Bahaa
Move declarations out of qemu-common.h for functions declared in utils/ files: e.g. include/qemu/path.h for utils/path.c. Move inline functions out of qemu-common.h and into new files (e.g. include/qemu/bcd.h) Signed-off-by: Veronia Bahaa <veroniabahaa@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-02-25qga: Support enum names in guest-file-seekEric Blake
Magic constants are a pain to use, especially when we run the risk that our choice of '1' for QGA_SEEK_CUR might differ from the host or guest's choice of SEEK_CUR. Better is to use an enum value, via a qapi alternate type for back-compatibility. With this, {"command":"guest-file-seek", "arguments":{"handle":1, "offset":0, "whence":"cur"}} becomes a synonym for the older {"command":"guest-file-seek", "arguments":{"handle":1, "offset":0, "whence":1}} Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2016-02-04qga: Clean up includesPeter Maydell
Clean up includes so that osdep.h is included first and headers which it implies are not included manually. This commit was created with scripts/clean-includes. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1454089805-5470-9-git-send-email-peter.maydell@linaro.org
2015-12-18qga: convert to use error checked base64 decodeDaniel P. Berrange
Switch from using g_base64_decode over to qbase64_decode in order to get error checking of the base64 input data. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
2015-11-17qga: allow to lookup in PATH from the passed envp for guest-execYuri Pudgorodskiy
This was original behaviour before GLIB gspawn() rework and we rely on this behaviour. Signed-off-by: Yuri Pudgorodskiy <yur@virtuozzo.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Michael Roth <mdroth@linux.vnet.ibm.com> * add version check (2.33.2) for G_SPAWN_SEARCH_PATH_FROM_ENVP Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2015-11-17qga: fix for default env processing for guest-execYuri Pudgorodskiy
envp == NULL must be passed inside gspawn() if it was not passed with the command line. Original code inherits environment from the QGA, which is wrong. Signed-off-by: Yuri Pudgorodskiy <yur@virtuozzo.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2015-10-19qga: guest-exec simple stdin/stdout/stderr redirectionYuri Pudgorodskiy
Implemented with base64-encoded strings in qga json protocol. Glib portable GIOChannel is used for data I/O. Optinal stdin parameter of guest-exec command is now used as stdin content for spawned subprocess. If capture-output bool flag is specified, guest-exec redirects out/err file descriptiors internally to pipes and collects subprocess output. Guest-exe-status is modified to return this collected data to requestor in base64 encoding. Signed-off-by: Yuri Pudgorodskiy <yur@virtuozzo.com> Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> * switch from 'struct GuestIOExecData' to 'GuestIOExecData' * s/TRUE/true/g, s/FALSE/false/g for gboolean return values * s/inp_data/input_data/ Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2015-10-19qga: handle possible SIGPIPE in guest-file-writeDenis V. Lunev
qemu-ga should not exit on guest-file-write to pipe without read end but proper error code should be returned. The behavior of the spawned process should be default thus SIGPIPE processing should be reset to default after fork() but before exec(). Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Yuri Pudgorodskiy <yur@virtuozzo.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2015-10-19qga: guest exec functionalityYuri Pudgorodskiy
Guest-exec rewritten in platform-independent style with glib spawn. Child process is spawn asynchronously and exit status can later be picked up by guest-exec-status command. stdin/stdout/stderr of the child now is redirected to /dev/null Later we will add ability to specify stdin in guest-exec command and to get collected stdout/stderr with guest-exec-status. Signed-off-by: Yuri Pudgorodskiy <yur@virtuozzo.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Michael Roth <mdroth@linux.vnet.ibm.com> * use g_new0 in place of g_malloc for GuestExec struct * commit msg spelling fixes * s/inp-data/input-data * document capture-input mode as false by default * use GetProcessId() for pids on w32 instead of casting HANDLE Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2015-10-19qga: Use g_new() & friends where that makes obvious senseMarkus Armbruster
g_new(T, n) is neater than g_malloc(sizeof(T) * n). It's also safer, for two reasons. One, it catches multiplication overflowing size_t. Two, it returns T * rather than void *, which lets the compiler catch more type errors. This commit only touches allocations with size arguments of the form sizeof(T). Same Coccinelle semantic patch as in commit b45c03f. Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2014-05-09qga: Consistently name Error ** objects errp, and not errMarkus Armbruster
Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2013-10-10qemu-ga: Extend 'guest-info' command to expose flag 'success-response'Mark Wu
Now we have several qemu-ga commands not returning response on success. It has been documented in qga/qapi-schema.json already. This patch exposes the 'success-response' flag by extending 'guest-info' command. With this change, the clients can handle the command response more flexibly. Signed-off-by: Mark Wu <wudxw@linux.vnet.ibm.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com> *fixed up commit subject Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2013-10-10qemu-ga: Add interface to traverse the qmp command list by QmpCommandMark Wu
In the original code, qmp_get_command_list is used to construct a list of all commands' name. To get the information of all qga commands, it traverses the name list and search the command info with its name. So it can cause O(n^2) in the number of commands. This patch adds an interface to traverse the qmp command list by QmpCommand to replace qmp_get_command_list. It can decrease the complexity from O(n^2) to O(n). Signed-off-by: Mark Wu <wudxw@linux.vnet.ibm.com> Reviewed-by: Eric Blake <eblake@redhat.com> *fix up commit subject Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2013-01-30qemu-ga: Fix unchecked strdup() by converting to g_strdup()Markus Armbruster
I figure it's freed somewhere deep down in QAPI, with g_free(). Signed-off-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2012-12-19qapi: move include files to include/qobject/Paolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2012-05-15qemu-ga: align versioning with QEMU_VERSIONMichael Roth
Previously qemu-ga version was defined seperately. Since it is aligned with QEMU releases, use QEMU_VERSION instead. This also implies the version bump for 1.1[-rcN] release of qemu-ga. Reviewed-by: Michal Privoznik <mprivozn@redhat.com> Acked-by: Luiz Capitulino <lcapitulino@redhat.com> Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2012-03-12qemu-ga: add guest-sync-delimitedMichael Roth
guest-sync leaves it as an exercise to the user as to how to reliably obtain the response to guest-sync if the client had previously read in a partial response (due qemu-ga previously being restarted mid-"sentence" due to reboot, forced restart, etc). qemu-ga handles this situation on its end by having a client precede their guest-sync request with a 0xFF byte (invalid UTF-8), which qemu-ga/QEMU JSON parsers will treat as a flush event. Thus we can reliably flush the qemu-ga parser state in preparation for receiving the guest-sync request. guest-sync-delimited provides the same functionality for a client: when a guest-sync-delimited is issued, qemu-ga will precede it's response with a 0xFF byte that the client can use as an indicator to flush its buffer/parser state in preparation for reliably receiving the guest-sync-delimited response. It is also useful as an optimization for clients, since, after issuing a guest-sync-delimited, clients can safely discard all stale data read from the channel until the 0xFF is found. More information available on the wiki: http://wiki.qemu.org/Features/QAPI/GuestAgent#QEMU_Guest_Agent_Protocol Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
2012-02-23qemu-ga: separate out common commands from posix-specific onesMichael Roth
Many of the current RPC implementations are very much POSIX-specific and require complete re-writes for Windows. There are however a small set of core guest agent commands that are common to both, and other commands such as guest-file-* which *may* be portable. So we introduce commands.c for the latter, and will rename guest-agent-commands.c to commands-posix.c in a future commit. Windows implementations will go in commands-win32.c, eventually.
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