As part of the partial improvement to the POST reading
code I also added a max_post_size setting which defaults
to 1 MiB. POST inputs longer than that size get truncated.
This is separate to max_pastie_size, which is just the
size of one of the values in the POST data.
New code tries to guess a per-visitor IP address and uses
that (or its hash) to tell users apart.
This patch also adds a TAWASHI_WITH_IP_LOGGING cmake option
to enable or disable logging the IP address of your visitors
in various places (just one right now but don't assume things
to remain this way).
Also added a couple new CGI environment variables.
Env reads environment variables from the list it receives
from main(), so I can also pass it a forged list now
without needing extra classes with sometimes-virtual methods
or other cruft.
Get raw environment variables directly from main().
Add code to split on '=' in cgi_environment_vars and only pick
the ones that are interesting, just as before.
