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Right now, the daemon side of RPC events is hard-coded to at most one callback per eventID. But when there are hundreds of domains or networks coupled and multiple conections, then sending every event to every connection that wants an event, even for the connections that only care about events for a particular object, is inefficient. In order to track more than one callback in the server, we need to store callbacks by more than just their eventID. This patch rearranges the daemon side to store network callbacks in a dynamic array, which can eventually be used for multiple callbacks of the same eventID, although actual behavior is unchanged without further patches to the RPC protocol. For ease of review, domain events are saved for a later patch, as they touch more code. While at it, fix a bug where a malicious client could send a negative eventID to cause network event registration to access outside of array bounds (thankfully not a CVE, since domain events were already doing the bounds check, and since network events have not been released). * daemon/libvirtd.h (daemonClientPrivate): Alter the tracking of network events. * daemon/remote.c (daemonClientEventCallback): New struct. (remoteEventCallbackFree): New function. (remoteClientInitHook, remoteRelayNetworkEventLifecycle) (remoteClientFreeFunc) (remoteDispatchConnectNetworkEventRegisterAny): Track network callbacks differently. (remoteDispatchConnectNetworkEventDeregisterAny): Enforce bounds. Signed-off-by: Eric Blake <eblake@redhat.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>