Standalone helper process
It is fairly easy to run slirp in a standalone process. This would allow QEMU (and other programs) to use slirp without linking to its library, which brings security benefits.
We should probably "standardize" the behaviour of the helper, so competing implementation could emerge.
The related libvirt patch with other concerns about the helper & current status: https://www.redhat.com/archives/libvir-list/2019-April/msg01233.html