mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-28 05:50:37 +00:00
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 -*-*
|
|
|
|
##
|
|
#
|
|
# Echo back a unique integer value, and prepend to response a
|
|
# leading sentinel byte (0xFF) the client can check scan for.
|
|
#
|
|
# This is used by clients talking to the guest agent over the
|
|
# wire to ensure the stream is in sync and doesn't contain stale
|
|
# data from previous client. It must be issued upon initial
|
|
# connection, and after any client-side timeouts (including
|
|
# timeouts on receiving a response to this command).
|
|
#
|
|
# After issuing this request, all guest agent responses should be
|
|
# ignored until the response containing the unique integer value
|
|
# the client passed in is returned. Receival of the 0xFF sentinel
|
|
# byte must be handled as an indication that the client's
|
|
# lexer/tokenizer/parser state should be flushed/reset in
|
|
# preparation for reliably receiving the subsequent response. As
|
|
# an optimization, clients may opt to ignore all data until a
|
|
# sentinel value is receiving to avoid unecessary processing of
|
|
# stale data.
|
|
#
|
|
# Similarly, clients should also precede this *request*
|
|
# with a 0xFF byte to make sure the guest agent flushes any
|
|
# partially read JSON data from a previous client connection.
|
|
#
|
|
# @id: randomly generated 64-bit integer
|
|
#
|
|
# Returns: The unique integer id passed in by the client
|
|
#
|
|
# Since: 1.1
|
|
# ##
|
|
{ 'command': 'guest-sync-delimited'
|
|
'data': { 'id': 'int' },
|
|
'returns': 'int' }
|
|
|
|
##
|
|
# @guest-sync:
|
|
#
|
|
# Echo back a unique integer value
|
|
#
|
|
# This is used by clients talking to the guest agent over the
|
|
# wire to ensure the stream is in sync and doesn't contain stale
|
|
# data from previous client. All guest agent responses should be
|
|
# ignored until the provided unique integer value is returned,
|
|
# and it is up to the client to handle stale whole or
|
|
# partially-delivered JSON text in such a way that this response
|
|
# can be obtained.
|
|
#
|
|
# In cases where a partial stale response was previously
|
|
# received by the client, this cannot always be done reliably.
|
|
# One particular scenario being if qemu-ga responses are fed
|
|
# character-by-character into a JSON parser. In these situations,
|
|
# using guest-sync-delimited may be optimal.
|
|
#
|
|
# For clients that fetch responses line by line and convert them
|
|
# to JSON objects, guest-sync should be sufficient, but note that
|
|
# in cases where the channel is dirty some attempts at parsing the
|
|
# response may result in a parser error.
|
|
#
|
|
# Such clients should also precede this command
|
|
# with a 0xFF byte to make sure the guest agent flushes any
|
|
# partially read JSON data from a previous session.
|
|
#
|
|
# @id: randomly generated 64-bit integer
|
|
#
|
|
# Returns: The unique integer id passed in by the client
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-sync'
|
|
'data': { 'id': 'int' },
|
|
'returns': 'int' }
|
|
|
|
##
|
|
# @guest-ping:
|
|
#
|
|
# Ping the guest agent, a non-error return implies success
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-ping' }
|
|
|
|
##
|
|
# @GuestAgentCommandInfo:
|
|
#
|
|
# Information about guest agent commands.
|
|
#
|
|
# @name: name of the command
|
|
#
|
|
# @enabled: whether command is currently enabled by guest admin
|
|
#
|
|
# Since 1.1.0
|
|
##
|
|
{ 'type': 'GuestAgentCommandInfo',
|
|
'data': { 'name': 'str', 'enabled': 'bool' } }
|
|
|
|
##
|
|
# @GuestAgentInfo
|
|
#
|
|
# Information about guest agent.
|
|
#
|
|
# @version: guest agent version
|
|
#
|
|
# @supported_commands: Information about guest agent commands
|
|
#
|
|
# Since 0.15.0
|
|
##
|
|
{ 'type': 'GuestAgentInfo',
|
|
'data': { 'version': 'str',
|
|
'supported_commands': ['GuestAgentCommandInfo'] } }
|
|
##
|
|
# @guest-info:
|
|
#
|
|
# Get some information about the guest agent.
|
|
#
|
|
# Returns: @GuestAgentInfo
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-info',
|
|
'returns': 'GuestAgentInfo' }
|
|
|
|
##
|
|
# @guest-shutdown:
|
|
#
|
|
# Initiate guest-activated shutdown. Note: this is an asynchronous
|
|
# shutdown request, with no guaruntee of successful shutdown. Errors
|
|
# will be logged to guest's syslog.
|
|
#
|
|
# @mode: #optional "halt", "powerdown" (default), or "reboot"
|
|
#
|
|
# Returns: Nothing on success
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-shutdown', 'data': { '*mode': 'str' } }
|
|
|
|
##
|
|
# @guest-file-open:
|
|
#
|
|
# Open a file in the guest and retrieve a file handle for it
|
|
#
|
|
# @filepath: Full path to the file in the guest to open.
|
|
#
|
|
# @mode: #optional open mode, as per fopen(), "r" is the default.
|
|
#
|
|
# Returns: Guest file handle on success.
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-file-open',
|
|
'data': { 'path': 'str', '*mode': 'str' },
|
|
'returns': 'int' }
|
|
|
|
##
|
|
# @guest-file-close:
|
|
#
|
|
# Close an open file in the guest
|
|
#
|
|
# @handle: filehandle returned by guest-file-open
|
|
#
|
|
# Returns: Nothing on success.
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-file-close',
|
|
'data': { 'handle': 'int' } }
|
|
|
|
##
|
|
# @GuestFileRead
|
|
#
|
|
# Result of guest agent file-read operation
|
|
#
|
|
# @count: number of bytes read (note: count is *before*
|
|
# base64-encoding is applied)
|
|
#
|
|
# @buf-b64: base64-encoded bytes read
|
|
#
|
|
# @eof: whether EOF was encountered during read operation.
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'type': 'GuestFileRead',
|
|
'data': { 'count': 'int', 'buf-b64': 'str', 'eof': 'bool' } }
|
|
|
|
##
|
|
# @guest-file-read:
|
|
#
|
|
# Read from an open file in the guest. Data will be base64-encoded
|
|
#
|
|
# @handle: filehandle returned by guest-file-open
|
|
#
|
|
# @count: #optional maximum number of bytes to read (default is 4KB)
|
|
#
|
|
# Returns: @GuestFileRead on success.
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-file-read',
|
|
'data': { 'handle': 'int', '*count': 'int' },
|
|
'returns': 'GuestFileRead' }
|
|
|
|
##
|
|
# @GuestFileWrite
|
|
#
|
|
# Result of guest agent file-write operation
|
|
#
|
|
# @count: number of bytes written (note: count is actual bytes
|
|
# written, after base64-decoding of provided buffer)
|
|
#
|
|
# @eof: whether EOF was encountered during write operation.
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'type': 'GuestFileWrite',
|
|
'data': { 'count': 'int', 'eof': 'bool' } }
|
|
|
|
##
|
|
# @guest-file-write:
|
|
#
|
|
# Write to an open file in the guest.
|
|
#
|
|
# @handle: filehandle returned by guest-file-open
|
|
#
|
|
# @buf-b64: base64-encoded string representing data to be written
|
|
#
|
|
# @count: #optional bytes to write (actual bytes, after base64-decode),
|
|
# default is all content in buf-b64 buffer after base64 decoding
|
|
#
|
|
# Returns: @GuestFileWrite on success.
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-file-write',
|
|
'data': { 'handle': 'int', 'buf-b64': 'str', '*count': 'int' },
|
|
'returns': 'GuestFileWrite' }
|
|
|
|
|
|
##
|
|
# @GuestFileSeek
|
|
#
|
|
# Result of guest agent file-seek operation
|
|
#
|
|
# @position: current file position
|
|
#
|
|
# @eof: whether EOF was encountered during file seek
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'type': 'GuestFileSeek',
|
|
'data': { 'position': 'int', 'eof': 'bool' } }
|
|
|
|
##
|
|
# @guest-file-seek:
|
|
#
|
|
# Seek to a position in the file, as with fseek(), and return the
|
|
# current file position afterward. Also encapsulates ftell()'s
|
|
# functionality, just Set offset=0, whence=SEEK_CUR.
|
|
#
|
|
# @handle: filehandle returned by guest-file-open
|
|
#
|
|
# @offset: bytes to skip over in the file stream
|
|
#
|
|
# @whence: SEEK_SET, SEEK_CUR, or SEEK_END, as with fseek()
|
|
#
|
|
# Returns: @GuestFileSeek on success.
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-file-seek',
|
|
'data': { 'handle': 'int', 'offset': 'int', 'whence': 'int' },
|
|
'returns': 'GuestFileSeek' }
|
|
|
|
##
|
|
# @guest-file-flush:
|
|
#
|
|
# Write file changes bufferred in userspace to disk/kernel buffers
|
|
#
|
|
# @handle: filehandle returned by guest-file-open
|
|
#
|
|
# Returns: Nothing on success.
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-file-flush',
|
|
'data': { 'handle': 'int' } }
|
|
|
|
##
|
|
# @GuestFsFreezeStatus
|
|
#
|
|
# An enumation of filesystem freeze states
|
|
#
|
|
# @thawed: filesystems thawed/unfrozen
|
|
#
|
|
# @frozen: all non-network guest filesystems frozen
|
|
#
|
|
# @error: failure to thaw 1 or more
|
|
# previously frozen filesystems, or failure to open a previously
|
|
# cached filesytem (filesystem unmounted/directory changes, etc).
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'enum': 'GuestFsfreezeStatus',
|
|
'data': [ 'thawed', 'frozen', 'error' ] }
|
|
|
|
##
|
|
# @guest-fsfreeze-status:
|
|
#
|
|
# Get guest fsfreeze state. error state indicates
|
|
#
|
|
# Returns: GuestFsfreezeStatus ("thawed", "frozen", etc., as defined below)
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-fsfreeze-status',
|
|
'returns': 'GuestFsfreezeStatus' }
|
|
|
|
##
|
|
# @guest-fsfreeze-freeze:
|
|
#
|
|
# Sync and freeze all non-network guest filesystems
|
|
#
|
|
# Returns: Number of file systems frozen on success
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-fsfreeze-freeze',
|
|
'returns': 'int' }
|
|
|
|
##
|
|
# @guest-fsfreeze-thaw:
|
|
#
|
|
# Unfreeze frozen guest fileystems
|
|
#
|
|
# Returns: Number of file systems thawed
|
|
# If error, -1 (unknown error) or -errno
|
|
#
|
|
# Since: 0.15.0
|
|
##
|
|
{ 'command': 'guest-fsfreeze-thaw',
|
|
'returns': 'int' }
|
|
|
|
##
|
|
# @guest-suspend-disk
|
|
#
|
|
# Suspend guest to disk.
|
|
#
|
|
# This command tries to execute the scripts provided by the pm-utils package.
|
|
# If it's not available, the suspend operation will be performed by manually
|
|
# writing to a sysfs file.
|
|
#
|
|
# For the best results it's strongly recommended to have the pm-utils
|
|
# package installed in the guest.
|
|
#
|
|
# Returns: nothing on success
|
|
# If suspend to disk is not supported, Unsupported
|
|
#
|
|
# Notes: o This is an asynchronous request. There's no guarantee a response
|
|
# will be sent
|
|
# o It's strongly recommended to issue the guest-sync command before
|
|
# sending commands when the guest resumes
|
|
#
|
|
# Since: 1.1
|
|
##
|
|
{ 'command': 'guest-suspend-disk' }
|
|
|
|
##
|
|
# @guest-suspend-ram
|
|
#
|
|
# Suspend guest to ram.
|
|
#
|
|
# This command tries to execute the scripts provided by the pm-utils package.
|
|
# If it's not available, the suspend operation will be performed by manually
|
|
# writing to a sysfs file.
|
|
#
|
|
# For the best results it's strongly recommended to have the pm-utils
|
|
# package installed in the guest.
|
|
#
|
|
# IMPORTANT: guest-suspend-ram requires QEMU to support the 'system_wakeup'
|
|
# command. Thus, it's *required* to query QEMU for the presence of the
|
|
# 'system_wakeup' command before issuing guest-suspend-ram.
|
|
#
|
|
# Returns: nothing on success
|
|
# If suspend to ram is not supported, Unsupported
|
|
#
|
|
# Notes: o This is an asynchronous request. There's no guarantee a response
|
|
# will be sent
|
|
# o It's strongly recommended to issue the guest-sync command before
|
|
# sending commands when the guest resumes
|
|
#
|
|
# Since: 1.1
|
|
##
|
|
{ 'command': 'guest-suspend-ram' }
|
|
|
|
##
|
|
# @guest-suspend-hybrid
|
|
#
|
|
# Save guest state to disk and suspend to ram.
|
|
#
|
|
# This command requires the pm-utils package to be installed in the guest.
|
|
#
|
|
# IMPORTANT: guest-suspend-hybrid requires QEMU to support the 'system_wakeup'
|
|
# command. Thus, it's *required* to query QEMU for the presence of the
|
|
# 'system_wakeup' command before issuing guest-suspend-hybrid.
|
|
#
|
|
# Returns: nothing on success
|
|
# If hybrid suspend is not supported, Unsupported
|
|
#
|
|
# Notes: o This is an asynchronous request. There's no guarantee a response
|
|
# will be sent
|
|
# o It's strongly recommended to issue the guest-sync command before
|
|
# sending commands when the guest resumes
|
|
#
|
|
# Since: 1.1
|
|
##
|
|
{ 'command': 'guest-suspend-hybrid' }
|
|
|
|
##
|
|
# @GuestIpAddressType:
|
|
#
|
|
# An enumeration of supported IP address types
|
|
#
|
|
# @ipv4: IP version 4
|
|
#
|
|
# @ipv6: IP version 6
|
|
#
|
|
# Since: 1.1
|
|
##
|
|
{ 'enum': 'GuestIpAddressType',
|
|
'data': [ 'ipv4', 'ipv6' ] }
|
|
|
|
##
|
|
# @GuestIpAddress:
|
|
#
|
|
# @ip-address: IP address
|
|
#
|
|
# @ip-address-type: Type of @ip-address (e.g. ipv4, ipv6)
|
|
#
|
|
# @prefix: Network prefix length of @ip-address
|
|
#
|
|
# Since: 1.1
|
|
##
|
|
{ 'type': 'GuestIpAddress',
|
|
'data': {'ip-address': 'str',
|
|
'ip-address-type': 'GuestIpAddressType',
|
|
'prefix': 'int'} }
|
|
|
|
##
|
|
# @GuestNetworkInterface:
|
|
#
|
|
# @name: The name of interface for which info are being delivered
|
|
#
|
|
# @hardware-address: Hardware address of @name
|
|
#
|
|
# @ip-addresses: List of addresses assigned to @name
|
|
#
|
|
# Since: 1.1
|
|
##
|
|
{ 'type': 'GuestNetworkInterface',
|
|
'data': {'name': 'str',
|
|
'*hardware-address': 'str',
|
|
'*ip-addresses': ['GuestIpAddress'] } }
|
|
|
|
##
|
|
# @guest-network-get-interfaces:
|
|
#
|
|
# Get list of guest IP addresses, MAC addresses
|
|
# and netmasks.
|
|
#
|
|
# Returns: List of GuestNetworkInfo on success.
|
|
#
|
|
# Since: 1.1
|
|
##
|
|
{ 'command': 'guest-network-get-interfaces',
|
|
'returns': ['GuestNetworkInterface'] }
|