# This is the protocol switch function.  It keys off the form of the filename
# to determine how to process a particular class of messages.  It is expected
# that an internal function will be called to orchestrate the processing of
# the message and enforce proper semantics.

process (file) {

#| The file argument is the name of a file in the $POSTOFFICE/router
#| directory.

	db flush pwuid
	db flush pwnam
	db flush fullname
	db flush hostexpansions
	db flush recipients

#| Since we cannot detect that the password database has been updated under
#| our feet, we flush the cached information every once in a while (in this
#| case, before every message).

	LOGMSG=''

#| The LOGMSG variable is used by the intercept facility (in crossbar.cf)
#| to make sure only a single copy of a message is saved when required.
#| Each sender - recipient address pair can cause an intercept which can
#| specify a file to save the message to.  This variable is appended to
#| elsewhere, and processed at the end of this function.

	case "$file" in
#	[0-9]*.x400)	x400 "$file" ;;
#	[0-9]*.uucp)	uucpfilter "$file" > /tmp/X.$$
#			cat /tmp/X.$$ > "$file"
#			rfc822 "$file" ;;
	[0-9]*)		rfc822 "$file" ;;
	core*)		/bin/mv "$file" ../$file.router.$$
			return
			;;
	*)		/bin/mv "$file" ../postman/rtr."$file".$$
			return
			;;
	esac

	[ $? ] && return 0	# Leave when they returned failure..

#| The file names in the $POSTOFFICE/router directory are determined by
#| the parameter to the mail_open() C library routine.  This case
#| statement knows about the various message file types needed on your
#| system, and arranges appropriate processing of each.  The internal
#| function "rfc822" expects a file name as argument, and determines the
#| semantics of the message and of the configuration code.  For example,
#| the router, crossbar, and header_defer functions have semantics only
#| because the rfc822 function knows about them.  There are no other
#| message formats supported in this distribution.

	log info: recipients $(db count recipients) $(elements $(cdr $(cdr $(cdr $(cdr $envelopeinfo))))) '
'

#| For statistics gathering we print out the envelope information property
#| list in its entirety, except for the file name, and the message id, both
#| of which were logged earlier (in C code).

	for f in $LOGMSG
	do
		{ echo "==${file}==$(rfc822date)==" ;
		  /bin/cat ../queue/"$file" } >> $f && log saved "$file" in $f
	done

#| This does the saving of intercepted messages into archive files.

}