remove more filter-related cruft

ok gilles@

bypass the filter code for incoming smtp sessions.
experimental support for filters has been removed from the config
parser already, and we want to get rid of the remaining code.

ok gilles@

the PURGE_EVERYTHING flag used to purge config bits was inaccurate

ok eric@

smtpctl(8): Use an int to determine mode instead of __progname.

Ok millert@ gilles@

move variables expansion out of lka_session into their own file, this is a
mechanical diff to simplify a bit the lka code and prepare for moving
variables outside of the lookup process into the chroo

move variables expansion out of lka_session into their own file, this is a
mechanical diff to simplify a bit the lka code and prepare for moving
variables outside of the lookup process into the chrooted mda process.
no functional change for now.

ok eric@

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- filters are currently broken, do not allow using them until we're done

allow negation of authenticated keyword:
accept ! authenticated [...]

ok sunil@, jung@

Stop assuming that in_{addr,port}_t are typedefed in <sys/types.h> and
instead pull in <netinet/in.h> or <arpa/inet.h> when those are needed.

ok florian@ beck@ millert@

smtpd joins the 7 other daemons that share the same log.c file.

The only major difference was the "log_trace" concept that is only
used by smtpd - move it from log.c into util.c and make it a local

smtpd joins the 7 other daemons that share the same log.c file.

The only major difference was the "log_trace" concept that is only
used by smtpd - move it from log.c into util.c and make it a local
concept. This also needed to rename the global "verbose" variable to
"tracing" in a few places.

OK krw@ gilles@ eric@

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remove unused iobuf helpers

make struct io opaque:

- move struct io definition to ioev.c
- replace io_init/io_clear with io_new/io_free
- allocate an iobuf for each new io internally
- use struct io pointer in the rest of the

make struct io opaque:

- move struct io definition to ioev.c
- replace io_init/io_clear with io_new/io_free
- allocate an iobuf for each new io internally
- use struct io pointer in the rest of the code
- remove remaining uses of iobuf_*

ok gilles@ sunil@

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assign an id to each rule in the ruleset, first step towards an MTA layer
and scheduler simplification

ok eric@

Add io api functions for dealing with buffered data, as wrapper around
their iobuf counterparts.

ok gilles@ sunil@

Remove the "smtpctl stop" command.
The daemon is stopped with kill(1).

ok gilles@

get rid of the type-checking system on internal messages.
bump all imsg protocol versions since message format changed.

ok gilles@ sunil@

remove noop function

ok sunil@

get rid of the imsg buffer usage profiling code.

ok gilles@ jung@ sunil@

Remove dead code. queue_flow_control() has never been used and is
probably a bad idea.

ok gilles@

introduce "authenticated" parameter so rules may apply to authenticated
sessions specifically

ok eric@, sunil@, jung@

allow overriding the subaddressing delimiter with subaddressing-delimiter
keyword, the default is still +

ok eric@, sunil@

bump version

ok deraadt@

Implement the fork+exec pattern in smtpd.

The parent process forks child processes and re-exec each of them with
an additional "-x <proc>" argument. During the early setup phase, the
parent process

Implement the fork+exec pattern in smtpd.

The parent process forks child processes and re-exec each of them with
an additional "-x <proc>" argument. During the early setup phase, the
parent process sends ipc socket pairs to interconnect the child
processes as needed, and it passes the queue encryption key to the
queue if necessary. When this is done, all processes have their
environment set as in the fork-only case, and they can start doing
their work as before.

ok gilles@ jung@

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Nuke session_socket_blockmode() and session_socket_linger(). Use
the identical io_set_blocking() and io_set_linger().

Since both are always called to turn off blocking or lingering,
nuke the paramet

Nuke session_socket_blockmode() and session_socket_linger(). Use
the identical io_set_blocking() and io_set_linger().

Since both are always called to turn off blocking or lingering,
nuke the parameter and associated enum in favour of "just doing the
right thing".

While passing remove the unneeded last parameter to the remaining
fcntl(F_GETFL).

Finally, rename the functions to io_set_nonblocking() and
io_set_nolinger() for clarity.

No functional change.

Started with a sweep of fcntl() usage inspired by guenther@.

ok gilles@

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bump version

handle enqueuer socket as a regular listener that can be configured with
"listen on socket". this simplifies a bit of code, removes some special
cases and will allow attaching filters & masking sourc

handle enqueuer socket as a regular listener that can be configured with
"listen on socket". this simplifies a bit of code, removes some special
cases and will allow attaching filters & masking source just as on lo0.

diff from Peter Bisroev <peter@int19h.net>
ok gilles@, jung@

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