scripts/dc-dlvr

   1 #!/bin/sh
   2 # Copyright (C) 2008-2021 all contributors <meta@public-inbox.org>
   3 # License: GPL-3.0+ <http://www.gnu.org/licenses/gpl-3.0.txt>
   4 # This is installed as /etc/dc-dcvr on my system
   5 # to use with postfix main.cf: mailbox_command = /etc/dc-dlvr "$EXTENSION"
   6 DELIVER=/usr/lib/dovecot/deliver
   7 CLAMDSCAN=clamdscan
   8
   9 # change if your spamc/spamd listens elsewhere
  10 spamc='spamc'
  11
  12 # allow plus addressing to train spam filters, $1 is the $EXTENSION
  13 # which may be "trainspam" or "trainham".  Only allow spam training
  14 # when $CLIENT_ADDRESS is empty (local client)
  15 case $1,$CLIENT_ADDRESS in
  16 trainspam,) exec $spamc -L spam > /dev/null 2>&1 ;;
  17 trainham,) exec $spamc -L ham > /dev/null 2>&1 ;;
  18 esac
  19
  20 TMPMSG=$(mktemp -t dc-dlvr.orig.$USER.XXXXXX || exit 1)
  21 CDMSG=$(mktemp -t dc-dlvr.orig.$USER.XXXXXX || exit 1)
  22 rm_list="$TMPMSG $CDMSG"
  23
  24 cat >$CDMSG
  25 $CLAMDSCAN --quiet - <$CDMSG
  26 if test $? -eq 1
  27 then
  28         $DELIVER -m INBOX.spam <$CDMSG
  29         exec rm -f $rm_list
  30 fi
  31
  32 # pre-filter, for infrequently read lists which do their own spam filtering:
  33 if test -r ~/.dc-dlvr.pre
  34 then
  35         set -e
  36         mv -f $CDMSG $TMPMSG
  37         DEFAULT_INBOX=$(. ~/.dc-dlvr.pre)
  38         case $DEFAULT_INBOX in
  39         '') exec rm -f $rm_list ;;
  40         INBOX) ;; # do nothing
  41         *)
  42                 $DELIVER -m $DEFAULT_INBOX <$TMPMSG
  43                 exec rm -f $rm_list
  44                 ;;
  45         esac
  46         PREMSG=$(mktemp -t dc-dlvr.orig.$USER.XXXXXX || exit 1)
  47         rm_list="$rm_list $PREMSG"
  48         set +e
  49         mv -f $TMPMSG $PREMSG
  50         $spamc -E <$PREMSG >$TMPMSG
  51 else
  52         $spamc -E <$CDMSG >$TMPMSG
  53 fi
  54 err=$?
  55
  56 # normal delivery
  57 set -e
  58
  59 case $err in
  60 1) $DELIVER -m INBOX.spam <$TMPMSG ;;
  61 *)
  62         # users may override normal delivery and have it go elsewhere
  63         if test -r ~/.dc-dlvr.rc
  64         then
  65                 . ~/.dc-dlvr.rc
  66         else
  67                 $DELIVER -m INBOX <$TMPMSG
  68         fi
  69         ;;
  70 esac
  71
  72 exec rm -f $rm_list