This should avoid involuntary use of bind(2) with arbitrary socket paths. ok op@

Now that anyone can connect to the socket, it is probably safer to expose information about currently connected clients only to root.

Repository access is now controlled by access rules in gotd.conf, and concurrent connections to the gotd socket by local users are limited by the listen process. We should keep refining our anti-DoS measures in the future, but at least we have something in place now. ok jamsek, op

Allow administrators to tweak the default authentication and request timeouts if needed, and to tweak the limit of concurrent connections for specific user accounts. with several tweaks from and ok op@

ok op@, stsp@

op@ pointed out a problem in my initial patch where I forgot to call unveil(2) with a path before unveil(NULL, NULL). ok op, jamsek

The listen process now communicates the client UID/GID to the parent, and the auth process verifies this on behalf of the parent. This allows us to remove the "unix" pledge promise from the parent, removing parent access to syscalls such as listen() and accept() in the AF_UNIX domain. ok tracey@ op@

The authentication timeout was accidentally overriden by the request timeout. Fix this and set both timeouts in the same place for clarity. ok op@

ok op@

ok op, jamsek

errno may not be set to something interesting so switch to fatalx, and simplify the error message (knowing the failed function, which is also wrong, doesn't buy much here.) ok jamsek

In the future, gotd will fork+exec new processes for each client connection. Using unveil instead of chroot avoids having to start such processes as root. The -portable version could use chroot(2) where no equivalent to unveil(2) exists. A future component which starts new processes will be isolated as a separate process, which could run as root in the -portable version. ok op@

ok op@

ok op@

ok op@

Allows 'got commit' to use a ".diff" suffix for temporary diff files. ok op@

otherwise they end up running with default config which isn't ideal. ok stsp@

This will be used by an upcoming regress test suite for gotd(8). ok tracey