disable the privsep crypto engine on !OpenBSD it fails bandly at runtime on various linux distros and on freebsd. Until a fix is found, disable it so I can move forward.

remove has_siginfo and wrap siginfo behind #ifdef SIGINFO. avoids some warnings in !BSD.

fixes for -Wpointer-sign

add a privsep crypto engine Incorporate the OpenSMTPD' privsep crypto engine. The idea behind it is to never load the certificate' private keys in a networked process, instead they are loaded in a separate process (the `crypto' one) which signs payloads on the behalf of the server processes. This way, we greatly reduce the risk of leaking the certificate' private key should the server process be compromised. This currently compiles only on LibreSSL (portable fix is in the way).

drop useless debug statement

don't have the config being a global

move hosts into the config struct

move fastcgi from global var to the config struct while here also make them a list rather than a fixed-size array.

readd proxy certs and `require client ca' support Was temporarly disabled during the transition to real privsep. While here, fix a memory leak when using `require client ca'. Also, avoid leaking info about the parent address space layout to server processes by not sending pointer values.

less logger.h

make server_init and server_configure_done 'public' server_configure_done is the code we ran in IMSG_RECONF_END splitted in a separate functions. This is all needed for ge.c which doesn't do privsep but needs to bootstrap the server process.

remove debug code

rework the daemon to do fork+exec It uses the 'common' proc.c from various OpenBSD-daemons. gmid grew organically bit by bit and it was also the first place where I tried to implement privsep. It wasn't done very well, in fact the parent process (that retains root privileges) just fork()s a generation of servers, all sharing *exactly* the same address space. No good! Now, we fork() and re-exec() ourselves, so that each process has a fresh address space. Some features (require client ca for example) are temporarly disabled, will be fixed in subsequent commits. The "ge" program is also temporarly disabled as it needs tweaks to do privsep too.

switch to the more usual log.c

rename log.[ch] to logger.[ch]