mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-27 13:30:52 +00:00
1723d6b1cf
The SocketAddress 'fd' kind accepts the name of a file descriptor passed to the monitor with the 'getfd' command. This makes it impossible to use the 'fd' kind in cases where a monitor is not available. This can apply in handling command line argv at startup, or simply if internal code wants to use SocketAddress and pass a numeric FD it has acquired from elsewhere. Fortunately the 'getfd' command mandated that the FD names must not start with a leading digit. We can thus safely extend semantics of the SocketAddress 'fd' kind, to allow a purely numeric name to reference an file descriptor that QEMU already has open. There will be restrictions on when each kind can be used. In codepaths where we are handling a monitor command (ie cur_mon != NULL), we will only support use of named file descriptors as before. Use of FD numbers is still not permitted for monitor commands. In codepaths where we are not handling a monitor command (ie cur_mon == NULL), we will not support named file descriptors. Instead we can reference FD numers explicitly. This allows the app spawning QEMU to intentionally "leak" a pre-opened socket to QEMU and reference that in a SocketAddress definition, or for code inside QEMU to pass pre-opened FDs around. Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
155 lines
3.3 KiB
Python
155 lines
3.3 KiB
Python
# -*- Mode: Python -*-
|
|
|
|
##
|
|
# = Socket data types
|
|
##
|
|
|
|
{ 'include': 'common.json' }
|
|
|
|
##
|
|
# @NetworkAddressFamily:
|
|
#
|
|
# The network address family
|
|
#
|
|
# @ipv4: IPV4 family
|
|
#
|
|
# @ipv6: IPV6 family
|
|
#
|
|
# @unix: unix socket
|
|
#
|
|
# @vsock: vsock family (since 2.8)
|
|
#
|
|
# @unknown: otherwise
|
|
#
|
|
# Since: 2.1
|
|
##
|
|
{ 'enum': 'NetworkAddressFamily',
|
|
'data': [ 'ipv4', 'ipv6', 'unix', 'vsock', 'unknown' ] }
|
|
|
|
##
|
|
# @InetSocketAddressBase:
|
|
#
|
|
# @host: host part of the address
|
|
# @port: port part of the address
|
|
##
|
|
{ 'struct': 'InetSocketAddressBase',
|
|
'data': {
|
|
'host': 'str',
|
|
'port': 'str' } }
|
|
|
|
##
|
|
# @InetSocketAddress:
|
|
#
|
|
# Captures a socket address or address range in the Internet namespace.
|
|
#
|
|
# @numeric: true if the host/port are guaranteed to be numeric,
|
|
# false if name resolution should be attempted. Defaults to false.
|
|
# (Since 2.9)
|
|
#
|
|
# @to: If present, this is range of possible addresses, with port
|
|
# between @port and @to.
|
|
#
|
|
# @ipv4: whether to accept IPv4 addresses, default try both IPv4 and IPv6
|
|
#
|
|
# @ipv6: whether to accept IPv6 addresses, default try both IPv4 and IPv6
|
|
#
|
|
# Since: 1.3
|
|
##
|
|
{ 'struct': 'InetSocketAddress',
|
|
'base': 'InetSocketAddressBase',
|
|
'data': {
|
|
'*numeric': 'bool',
|
|
'*to': 'uint16',
|
|
'*ipv4': 'bool',
|
|
'*ipv6': 'bool' } }
|
|
|
|
##
|
|
# @UnixSocketAddress:
|
|
#
|
|
# Captures a socket address in the local ("Unix socket") namespace.
|
|
#
|
|
# @path: filesystem path to use
|
|
#
|
|
# Since: 1.3
|
|
##
|
|
{ 'struct': 'UnixSocketAddress',
|
|
'data': {
|
|
'path': 'str' } }
|
|
|
|
##
|
|
# @VsockSocketAddress:
|
|
#
|
|
# Captures a socket address in the vsock namespace.
|
|
#
|
|
# @cid: unique host identifier
|
|
# @port: port
|
|
#
|
|
# Note: string types are used to allow for possible future hostname or
|
|
# service resolution support.
|
|
#
|
|
# Since: 2.8
|
|
##
|
|
{ 'struct': 'VsockSocketAddress',
|
|
'data': {
|
|
'cid': 'str',
|
|
'port': 'str' } }
|
|
|
|
##
|
|
# @SocketAddressLegacy:
|
|
#
|
|
# Captures the address of a socket, which could also be a named file descriptor
|
|
#
|
|
# Note: This type is deprecated in favor of SocketAddress. The
|
|
# difference between SocketAddressLegacy and SocketAddress is that the
|
|
# latter is a flat union rather than a simple union. Flat is nicer
|
|
# because it avoids nesting on the wire, i.e. that form has fewer {}.
|
|
|
|
#
|
|
# Since: 1.3
|
|
##
|
|
{ 'union': 'SocketAddressLegacy',
|
|
'data': {
|
|
'inet': 'InetSocketAddress',
|
|
'unix': 'UnixSocketAddress',
|
|
'vsock': 'VsockSocketAddress',
|
|
'fd': 'String' } }
|
|
|
|
##
|
|
# @SocketAddressType:
|
|
#
|
|
# Available SocketAddress types
|
|
#
|
|
# @inet: Internet address
|
|
#
|
|
# @unix: Unix domain socket
|
|
#
|
|
# @vsock: VMCI address
|
|
#
|
|
# @fd: decimal is for file descriptor number, otherwise a file descriptor name.
|
|
# Named file descriptors are permitted in monitor commands, in combination
|
|
# with the 'getfd' command. Decimal file descriptors are permitted at
|
|
# startup or other contexts where no monitor context is active.
|
|
#
|
|
# Since: 2.9
|
|
##
|
|
{ 'enum': 'SocketAddressType',
|
|
'data': [ 'inet', 'unix', 'vsock', 'fd' ] }
|
|
|
|
##
|
|
# @SocketAddress:
|
|
#
|
|
# Captures the address of a socket, which could also be a named file
|
|
# descriptor
|
|
#
|
|
# @type: Transport type
|
|
#
|
|
# Since: 2.9
|
|
##
|
|
{ 'union': 'SocketAddress',
|
|
'base': { 'type': 'SocketAddressType' },
|
|
'discriminator': 'type',
|
|
'data': { 'inet': 'InetSocketAddress',
|
|
'unix': 'UnixSocketAddress',
|
|
'vsock': 'VsockSocketAddress',
|
|
'fd': 'String' } }
|