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|
#!/bin/bash
# Esmtp-wrapper adds shell based queueing support to esmtp.
# Copyright (C) 2007 by Phil Sutter <phil@nwl.cc>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
qdir="$HOME/.esmtp_queue"
deliver_lock="$qdir/.deliver_lock"
esmtp="/usr/bin/esmtp"
mktemp="/bin/mktemp"
dotlockfile="/usr/bin/dotlockfile"
__do_check_program() { # (path to program)
[ -x "$1" ] || { \
echo "required program '$1' not found, exiting"
exit 1
}
}
check_programs() { # ()
__do_check_program "$esmtp"
__do_check_program "$mktemp"
__do_check_program "$dotlockfile"
}
queue_mail() { # ($@)
local ret=0
mkdir -p "$qdir" || {
echo "unable to create queue dir $qdir" 2>&1
return 1
}
mdir="`$mktemp -d "$qdir/XXXXXXXX"`"
[ -d "$mdir" ] || {
echo "unable to create tempdir inside $qdir" 2>&1
return 1
}
touch "$mdir/lock"
echo "$@" >"$mdir/cmd" || ret=1
cat </dev/stdin >"$mdir/mail" || ret=1
[ $ret -eq 0 ] || {
echo "could not enqueue mail in dir $mdir" 2>&1
return 1
}
chmod 0600 $mdir/* || echo "warning setting secure permissions failed!" 2>&1
rm "$mdir/lock"
return 0
}
show_mail() { # ($mdir)
echo "mail in dir $1:"
printf '\t%s' "`grep ^From: "$1/mail"`"
printf '\t%s' "`grep ^To: "$1/mail"`"
[ -f "$1/lock" ] && printf '\t%s' "[LOCKED]"
printf '\t%s\n' "`grep ^Date: "$1/mail"`"
}
show_queue() { # ()
local i=0
local lockwarn=0
for dir in $qdir/*; do
[ ! -d "$dir" ] && continue
[ -f "$dir/lock" ] && lockwarn=1
show_mail $dir
let i++
done
echo "$i mails to deliver"
[ $lockwarn -eq 0 ] || { \
printf '\n%s\n' "Warning: locked mails in queue!"; \
printf '%s' "This means that either enqueueing is in "; \
printf '%s\n' "progress, or it failed for some reason."; \
}
}
send_mail() { # ($mdir)
$esmtp $(<"$1/cmd") <"$1/mail" && \
rm -rf "$1" || return 1
return $?
}
deliver_queue() { # ([background])
local undelivered=0
# when delivering in background, there is time to wait
# for a potential burst run (git-send-email, e.g.) or
# exiting of other delivery jobs.
if [[ "$1" = "background" ]]; then
sleep 5
fi
if ! $dotlockfile -p -l "$deliver_lock"; then
return 1
fi
for dir in $qdir/*; do
[ ! -d "$dir" ] && continue
[ -f "$dir/lock" ] && continue
send_mail "$dir"
undelivered=`expr $undelivered + $?`
done
$dotlockfile -u "$deliver_lock"
return $undelivered
}
ME=`basename "$0"`
check_programs # possible program exit point
case "$ME" in
sendmail|esmtp)
queue_mail "$@" || return 1
deliver_queue "background" &
;;
deliver)
deliver_queue
;;
mailq)
if [ x"$1" = x"-q" ]; then
deliver_queue
else
show_queue
fi
;;
*)
exit 1
;;
esac
exit $?
|
