batv-sendmail

#!/bin/bash

# This script works in both bash and ksh93.  It uses arrays and the getopts
# builtin so it doesn't work in the Bourne shell.

sender= # TODO: perhaps set a default sender based on $LOGNAME and /etc/mailname or FQDN?

# relevant sendmail options:
#  B:		body type 7bit or 8bitmime
#  C:		config file
#  F:		sender fullname
#  f:		sender address
#  i		ignore dots
#  G		gateway submission ???
#  h:		hop count ???
#  L:		syslog label ???
#  N:		DSN conditions ???
#  n		don't do aliasing ???
#  O:		set option ???
#  o:		set option (important for -oi... but note syntax sometimes demands two args)
#  R:		return limit ???
#  r:		obsolete form of -f
#  t		extract recips from header
#  V:		original envelope ID
#  v		verbose mode

unset sendmail_options
while getopts :B:C:F:f:ih:L:N:nO:o:R:r:tV:v CH
do
	case $CH in
		"?")			echo "$0: Unknown option: $OPTARG" >&2
					exit 2;;
		f|r)			sender="$OPTARG";;
		o)			sendmail_options+=("-$CH$OPTARG");;
		B|C|F|h|L|N|O|R|V)	sendmail_options+=("-$CH" "$OPTARG");;
		*)			sendmail_options+=("-$CH");;
	esac
done
shift $((OPTIND - 1))

if [[ -z $sender ]]
then
	echo "$0: Sender must be specified with -f" >&2
	exit 2
fi

unset batv_options
if [[ -n $BATV_DELIMITER ]]
then
	batv_options+=("-d" "$BATV_DELIMITER")
fi
if [[ -n $BATV_KEY_FILE ]]
then
	batv_options+=("-k" "$BATV_KEY_FILE")
fi
if [[ -n $BATV_LIFETIME ]]
then
	batv_options+=("-l" "$BATV_LIFETIME")
fi

batv_sender=$(batv-sign "${batv_options[@]}" -- "$sender") || exit $?

exec sendmail -f "$batv_sender" "${sendmail_options[@]}" -- "$@"