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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 -*-
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##
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# = Socket data types
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##
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{ 'include': 'common.json' }
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##
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# @NetworkAddressFamily:
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#
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# The network address family
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#
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# @ipv4: IPV4 family
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#
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# @ipv6: IPV6 family
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#
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# @unix: unix socket
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#
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# @vsock: vsock family (since 2.8)
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#
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# @unknown: otherwise
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#
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# Since: 2.1
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##
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{ 'enum': 'NetworkAddressFamily',
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'data': [ 'ipv4', 'ipv6', 'unix', 'vsock', 'unknown' ] }
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##
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# @InetSocketAddressBase:
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#
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# @host: host part of the address
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# @port: port part of the address
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##
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{ 'struct': 'InetSocketAddressBase',
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'data': {
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'host': 'str',
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'port': 'str' } }
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##
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# @InetSocketAddress:
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#
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# Captures a socket address or address range in the Internet namespace.
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#
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# @numeric: true if the host/port are guaranteed to be numeric,
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# false if name resolution should be attempted. Defaults to false.
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# (Since 2.9)
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#
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# @to: If present, this is range of possible addresses, with port
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# between @port and @to.
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#
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# @ipv4: whether to accept IPv4 addresses, default try both IPv4 and IPv6
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#
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# @ipv6: whether to accept IPv6 addresses, default try both IPv4 and IPv6
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#
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# Since: 1.3
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##
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{ 'struct': 'InetSocketAddress',
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'base': 'InetSocketAddressBase',
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'data': {
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'*numeric': 'bool',
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'*to': 'uint16',
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'*ipv4': 'bool',
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'*ipv6': 'bool' } }
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##
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# @UnixSocketAddress:
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#
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# Captures a socket address in the local ("Unix socket") namespace.
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#
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# @path: filesystem path to use
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#
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# Since: 1.3
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##
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{ 'struct': 'UnixSocketAddress',
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'data': {
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'path': 'str' } }
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##
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# @VsockSocketAddress:
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#
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# Captures a socket address in the vsock namespace.
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#
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# @cid: unique host identifier
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# @port: port
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#
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# Note: string types are used to allow for possible future hostname or
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# service resolution support.
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#
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# Since: 2.8
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##
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{ 'struct': 'VsockSocketAddress',
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'data': {
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'cid': 'str',
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'port': 'str' } }
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##
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# @SocketAddressLegacy:
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#
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# Captures the address of a socket, which could also be a named file descriptor
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#
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# Note: This type is deprecated in favor of SocketAddress. The
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# difference between SocketAddressLegacy and SocketAddress is that the
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# latter is a flat union rather than a simple union. Flat is nicer
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# because it avoids nesting on the wire, i.e. that form has fewer {}.
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#
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# Since: 1.3
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##
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{ 'union': 'SocketAddressLegacy',
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'data': {
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'inet': 'InetSocketAddress',
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'unix': 'UnixSocketAddress',
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'vsock': 'VsockSocketAddress',
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'fd': 'String' } }
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##
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# @SocketAddressType:
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#
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# Available SocketAddress types
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#
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# @inet: Internet address
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#
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# @unix: Unix domain socket
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#
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# @vsock: VMCI address
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#
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# @fd: decimal is for file descriptor number, otherwise a file descriptor name.
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# Named file descriptors are permitted in monitor commands, in combination
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# with the 'getfd' command. Decimal file descriptors are permitted at
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# startup or other contexts where no monitor context is active.
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#
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# Since: 2.9
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##
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{ 'enum': 'SocketAddressType',
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'data': [ 'inet', 'unix', 'vsock', 'fd' ] }
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##
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# @SocketAddress:
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#
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# Captures the address of a socket, which could also be a named file
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# descriptor
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#
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# @type: Transport type
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#
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# Since: 2.9
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##
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{ 'union': 'SocketAddress',
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'base': { 'type': 'SocketAddressType' },
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'discriminator': 'type',
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'data': { 'inet': 'InetSocketAddress',
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'unix': 'UnixSocketAddress',
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'vsock': 'VsockSocketAddress',
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'fd': 'String' } }
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