3cf0bed836
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>
478 lines
12 KiB
Python
478 lines
12 KiB
Python
# *-*- Mode: Python -*-*
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##
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#
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# Echo back a unique integer value, and prepend to response a
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# leading sentinel byte (0xFF) the client can check scan for.
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#
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# This is used by clients talking to the guest agent over the
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# wire to ensure the stream is in sync and doesn't contain stale
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# data from previous client. It must be issued upon initial
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# connection, and after any client-side timeouts (including
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# timeouts on receiving a response to this command).
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#
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# After issuing this request, all guest agent responses should be
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# ignored until the response containing the unique integer value
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# the client passed in is returned. Receival of the 0xFF sentinel
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# byte must be handled as an indication that the client's
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# lexer/tokenizer/parser state should be flushed/reset in
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# preparation for reliably receiving the subsequent response. As
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# an optimization, clients may opt to ignore all data until a
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# sentinel value is receiving to avoid unecessary processing of
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# stale data.
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#
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# Similarly, clients should also precede this *request*
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# with a 0xFF byte to make sure the guest agent flushes any
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# partially read JSON data from a previous client connection.
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#
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# @id: randomly generated 64-bit integer
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#
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# Returns: The unique integer id passed in by the client
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#
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# Since: 1.1
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# ##
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{ 'command': 'guest-sync-delimited'
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'data': { 'id': 'int' },
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'returns': 'int' }
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##
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# @guest-sync:
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#
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# Echo back a unique integer value
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#
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# This is used by clients talking to the guest agent over the
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# wire to ensure the stream is in sync and doesn't contain stale
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# data from previous client. All guest agent responses should be
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# ignored until the provided unique integer value is returned,
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# and it is up to the client to handle stale whole or
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# partially-delivered JSON text in such a way that this response
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# can be obtained.
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#
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# In cases where a partial stale response was previously
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# received by the client, this cannot always be done reliably.
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# One particular scenario being if qemu-ga responses are fed
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# character-by-character into a JSON parser. In these situations,
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# using guest-sync-delimited may be optimal.
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#
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# For clients that fetch responses line by line and convert them
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# to JSON objects, guest-sync should be sufficient, but note that
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# in cases where the channel is dirty some attempts at parsing the
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# response may result in a parser error.
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#
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# Such clients should also precede this command
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# with a 0xFF byte to make sure the guest agent flushes any
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# partially read JSON data from a previous session.
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#
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# @id: randomly generated 64-bit integer
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#
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# Returns: The unique integer id passed in by the client
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-sync'
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'data': { 'id': 'int' },
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'returns': 'int' }
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##
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# @guest-ping:
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#
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# Ping the guest agent, a non-error return implies success
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-ping' }
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##
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# @GuestAgentCommandInfo:
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#
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# Information about guest agent commands.
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#
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# @name: name of the command
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#
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# @enabled: whether command is currently enabled by guest admin
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#
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# Since 1.1.0
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##
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{ 'type': 'GuestAgentCommandInfo',
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'data': { 'name': 'str', 'enabled': 'bool' } }
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##
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# @GuestAgentInfo
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#
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# Information about guest agent.
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#
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# @version: guest agent version
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#
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# @supported_commands: Information about guest agent commands
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#
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# Since 0.15.0
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##
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{ 'type': 'GuestAgentInfo',
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'data': { 'version': 'str',
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'supported_commands': ['GuestAgentCommandInfo'] } }
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##
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# @guest-info:
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#
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# Get some information about the guest agent.
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#
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# Returns: @GuestAgentInfo
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-info',
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'returns': 'GuestAgentInfo' }
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##
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# @guest-shutdown:
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#
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# Initiate guest-activated shutdown. Note: this is an asynchronous
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# shutdown request, with no guaruntee of successful shutdown. Errors
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# will be logged to guest's syslog.
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#
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# @mode: #optional "halt", "powerdown" (default), or "reboot"
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#
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# Returns: Nothing on success
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-shutdown', 'data': { '*mode': 'str' } }
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##
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# @guest-file-open:
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#
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# Open a file in the guest and retrieve a file handle for it
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#
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# @filepath: Full path to the file in the guest to open.
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#
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# @mode: #optional open mode, as per fopen(), "r" is the default.
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#
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# Returns: Guest file handle on success.
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-file-open',
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'data': { 'path': 'str', '*mode': 'str' },
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'returns': 'int' }
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##
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# @guest-file-close:
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#
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# Close an open file in the guest
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#
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# @handle: filehandle returned by guest-file-open
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#
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# Returns: Nothing on success.
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-file-close',
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'data': { 'handle': 'int' } }
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##
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# @GuestFileRead
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#
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# Result of guest agent file-read operation
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#
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# @count: number of bytes read (note: count is *before*
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# base64-encoding is applied)
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#
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# @buf-b64: base64-encoded bytes read
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#
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# @eof: whether EOF was encountered during read operation.
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#
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# Since: 0.15.0
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##
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{ 'type': 'GuestFileRead',
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'data': { 'count': 'int', 'buf-b64': 'str', 'eof': 'bool' } }
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##
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# @guest-file-read:
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#
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# Read from an open file in the guest. Data will be base64-encoded
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#
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# @handle: filehandle returned by guest-file-open
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#
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# @count: #optional maximum number of bytes to read (default is 4KB)
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#
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# Returns: @GuestFileRead on success.
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-file-read',
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'data': { 'handle': 'int', '*count': 'int' },
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'returns': 'GuestFileRead' }
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##
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# @GuestFileWrite
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#
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# Result of guest agent file-write operation
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#
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# @count: number of bytes written (note: count is actual bytes
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# written, after base64-decoding of provided buffer)
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#
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# @eof: whether EOF was encountered during write operation.
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#
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# Since: 0.15.0
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##
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{ 'type': 'GuestFileWrite',
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'data': { 'count': 'int', 'eof': 'bool' } }
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##
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# @guest-file-write:
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#
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# Write to an open file in the guest.
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#
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# @handle: filehandle returned by guest-file-open
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#
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# @buf-b64: base64-encoded string representing data to be written
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#
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# @count: #optional bytes to write (actual bytes, after base64-decode),
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# default is all content in buf-b64 buffer after base64 decoding
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#
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# Returns: @GuestFileWrite on success.
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-file-write',
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'data': { 'handle': 'int', 'buf-b64': 'str', '*count': 'int' },
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'returns': 'GuestFileWrite' }
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##
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# @GuestFileSeek
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#
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# Result of guest agent file-seek operation
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#
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# @position: current file position
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#
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# @eof: whether EOF was encountered during file seek
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#
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# Since: 0.15.0
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##
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{ 'type': 'GuestFileSeek',
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'data': { 'position': 'int', 'eof': 'bool' } }
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##
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# @guest-file-seek:
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#
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# Seek to a position in the file, as with fseek(), and return the
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# current file position afterward. Also encapsulates ftell()'s
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# functionality, just Set offset=0, whence=SEEK_CUR.
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#
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# @handle: filehandle returned by guest-file-open
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#
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# @offset: bytes to skip over in the file stream
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#
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# @whence: SEEK_SET, SEEK_CUR, or SEEK_END, as with fseek()
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#
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# Returns: @GuestFileSeek on success.
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-file-seek',
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'data': { 'handle': 'int', 'offset': 'int', 'whence': 'int' },
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'returns': 'GuestFileSeek' }
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##
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# @guest-file-flush:
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#
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# Write file changes bufferred in userspace to disk/kernel buffers
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#
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# @handle: filehandle returned by guest-file-open
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#
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# Returns: Nothing on success.
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-file-flush',
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'data': { 'handle': 'int' } }
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##
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# @GuestFsFreezeStatus
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#
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# An enumation of filesystem freeze states
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#
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# @thawed: filesystems thawed/unfrozen
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#
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# @frozen: all non-network guest filesystems frozen
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#
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# @error: failure to thaw 1 or more
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# previously frozen filesystems, or failure to open a previously
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# cached filesytem (filesystem unmounted/directory changes, etc).
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#
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# Since: 0.15.0
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##
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{ 'enum': 'GuestFsfreezeStatus',
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'data': [ 'thawed', 'frozen', 'error' ] }
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##
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# @guest-fsfreeze-status:
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#
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# Get guest fsfreeze state. error state indicates
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#
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# Returns: GuestFsfreezeStatus ("thawed", "frozen", etc., as defined below)
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-fsfreeze-status',
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'returns': 'GuestFsfreezeStatus' }
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##
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# @guest-fsfreeze-freeze:
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#
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# Sync and freeze all non-network guest filesystems
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#
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# Returns: Number of file systems frozen on success
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-fsfreeze-freeze',
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'returns': 'int' }
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##
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# @guest-fsfreeze-thaw:
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#
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# Unfreeze frozen guest fileystems
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#
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# Returns: Number of file systems thawed
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# If error, -1 (unknown error) or -errno
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#
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# Since: 0.15.0
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##
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{ 'command': 'guest-fsfreeze-thaw',
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'returns': 'int' }
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##
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# @guest-suspend-disk
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#
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# Suspend guest to disk.
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#
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# This command tries to execute the scripts provided by the pm-utils package.
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# If it's not available, the suspend operation will be performed by manually
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# writing to a sysfs file.
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#
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# For the best results it's strongly recommended to have the pm-utils
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# package installed in the guest.
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#
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# Returns: nothing on success
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# If suspend to disk is not supported, Unsupported
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#
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# Notes: o This is an asynchronous request. There's no guarantee a response
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# will be sent
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# o It's strongly recommended to issue the guest-sync command before
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# sending commands when the guest resumes
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#
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# Since: 1.1
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##
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{ 'command': 'guest-suspend-disk' }
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##
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# @guest-suspend-ram
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#
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# Suspend guest to ram.
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#
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# This command tries to execute the scripts provided by the pm-utils package.
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# If it's not available, the suspend operation will be performed by manually
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# writing to a sysfs file.
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#
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# For the best results it's strongly recommended to have the pm-utils
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# package installed in the guest.
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#
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# IMPORTANT: guest-suspend-ram requires QEMU to support the 'system_wakeup'
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# command. Thus, it's *required* to query QEMU for the presence of the
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# 'system_wakeup' command before issuing guest-suspend-ram.
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#
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# Returns: nothing on success
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# If suspend to ram is not supported, Unsupported
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#
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# Notes: o This is an asynchronous request. There's no guarantee a response
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# will be sent
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# o It's strongly recommended to issue the guest-sync command before
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# sending commands when the guest resumes
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#
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# Since: 1.1
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##
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{ 'command': 'guest-suspend-ram' }
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##
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# @guest-suspend-hybrid
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#
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# Save guest state to disk and suspend to ram.
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#
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# This command requires the pm-utils package to be installed in the guest.
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#
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# IMPORTANT: guest-suspend-hybrid requires QEMU to support the 'system_wakeup'
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# command. Thus, it's *required* to query QEMU for the presence of the
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# 'system_wakeup' command before issuing guest-suspend-hybrid.
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#
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# Returns: nothing on success
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# If hybrid suspend is not supported, Unsupported
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#
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# Notes: o This is an asynchronous request. There's no guarantee a response
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# will be sent
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# o It's strongly recommended to issue the guest-sync command before
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# sending commands when the guest resumes
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#
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# Since: 1.1
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##
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{ 'command': 'guest-suspend-hybrid' }
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##
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# @GuestIpAddressType:
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#
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# An enumeration of supported IP address types
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#
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# @ipv4: IP version 4
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#
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# @ipv6: IP version 6
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#
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# Since: 1.1
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##
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{ 'enum': 'GuestIpAddressType',
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'data': [ 'ipv4', 'ipv6' ] }
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##
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# @GuestIpAddress:
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#
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# @ip-address: IP address
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#
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# @ip-address-type: Type of @ip-address (e.g. ipv4, ipv6)
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#
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# @prefix: Network prefix length of @ip-address
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#
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# Since: 1.1
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##
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{ 'type': 'GuestIpAddress',
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'data': {'ip-address': 'str',
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'ip-address-type': 'GuestIpAddressType',
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'prefix': 'int'} }
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##
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# @GuestNetworkInterface:
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#
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# @name: The name of interface for which info are being delivered
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#
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# @hardware-address: Hardware address of @name
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#
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# @ip-addresses: List of addresses assigned to @name
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#
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# Since: 1.1
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##
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{ 'type': 'GuestNetworkInterface',
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'data': {'name': 'str',
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'*hardware-address': 'str',
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'*ip-addresses': ['GuestIpAddress'] } }
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##
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# @guest-network-get-interfaces:
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#
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# Get list of guest IP addresses, MAC addresses
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# and netmasks.
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#
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# Returns: List of GuestNetworkInfo on success.
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#
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# Since: 1.1
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##
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{ 'command': 'guest-network-get-interfaces',
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'returns': ['GuestNetworkInterface'] }
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