TODO:
can log_file be written to?
add systemd unit?

remove magic numbers

make log output user adjustable

add gmiaccess stuff

add cgi stuff

better magic detection

check if loaded cert/keys are actually valid

check values for keys in config file

handle signals like interrupt better

recently-accepted-cert-cache for specific cert-req keys, doing a look up EACH and EVERY TIME can be expensive when it it likely that a single person will be looking around.

reduce complexity in cert_req()

permission denied when the file is readable (MAC permissions)

use GetOpt::Long in a reasonable manner

map_server_alias() perhaps should not exist.
In general, I am unsatisfied with the program keeping the configuration file in memory and constantly referring to it.  map_server_alias() literally just copies it's vhost's config and keeps it in the config hash.

reduce complexity in listen_config()