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Re: Do not make mksh the default shell on macOS

On 07/14, Jonathan Perkin wrote:
> * On 2020-07-14 at 12:09 BST, Greg Troxel wrote:
> > Is it possible to run pbulk on macos now, with SIP enabled?
> It's not specifically whether pbulk runs, it's that there are a number
> of issues regarding creating sandboxes that SIP prevents.  The most
> important one is that DNS resolution does not work inside as it's not
> possible to modify mDNSResponder to listen on additional sockets, but
> from memory even working around that with static entries in /etc/hosts
> still resulted in other problems (I'll probably try again one day).

I know you tried various things, and this is complicated, but I think
you considered (or even tried?) using socat at one point, so if you ever
go back to trying a socket-proxy approach, this guy, referring to socat
not working, said in

the following:

  The problem here is that requests and responses on the
  /var/run/mDNSResponder socket use the "ancillary data" feature of the
  recvmsg and sendmsg system calls, and socat doesn't proxy ancillary
  data.  I was able to get a custom proxy that does relay the ancillary
  data to work and provide DNS to processes inside a chroot.

I don't know how his custom proxy worked, but maybe that's another
option: provide a custom mDNSResponder proxy in the chroot.


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