1 #!/bin/rc
2 
3 # create a /tmp for here documents
4 rfork en
5 bind -c /mail/tmp /tmp
6 
7 KEY=whocares
8 USER=ken
9 
10 RECIP=$1
11 MBOX=$2
12 PF=/mail/box/$USER/_pattern
13 TMP=/mail/tmp/mine.$pid
14 BIN=/bin/upas
15 D=/mail/fs/mbox/1
16 
17 # save and parse the mail file
18 {sed '/^$/,$ s/^From / From /'; echo} > $TMP
19 upas/fs -f $TMP
20 
21 # if we like the source
22 # or if the subject contains a valid token
23 # then deliver the mail and allow all the addresses
24 if( $BIN/list check $PF $D/from $D/sender $D/replyto )
25 {
26 	$BIN/deliver $RECIP $D/from $MBOX < $D/raw
27 	$BIN/list add $PF $D/from $D/to $D/cc $D/sender
28 	rm $TMP
29 	exit 0
30 }
31 switch($status){
32 case *!match*
33 	echo `{date} dropped $RECIP From `{cat $D/replyto} >> /mail/box/$USER/_bounced >[2] /dev/null
34 	rm $TMP
35 	exit 0
36 }
37 if ( $BIN/token $KEY $D/subject )
38 {
39 	$BIN/deliver $RECIP $D/from $MBOX < $D/raw
40 	$BIN/list add $PF $D/from $D/to $D/cc $D/sender
41 	rm $TMP
42 	echo `{date} added $RECIP From `{cat $D/replyto} \
43 		>> /mail/box/$USER/_bounced >[2] /dev/null
44 	exit 0
45 }
46 
47 # don't recognize the sender so
48 # return the message with instructions
49 TOKEN=`{upas/token $KEY}
50 upasname=/dev/null
51 {{cat; cat $D/raw} | upas/send `{cat $D/replyto}}<<EOF
52 Subject: $USER's mail filter
53 I've been getting so much junk mail that I'm resorting to
54 a draconian mechanism to avoid the mail.  In order
55 to make sure that there's a real person sending mail, I'm
56 asking you to explicitly enable access.  To do that, send
57 mail to $USER at this domain with the token:
58 	$TOKEN
59 in the subject of your mail message.  After that, you
60 shouldn't get any bounces from me.  Sorry if this is
61 an inconvenience.
62 
63 ----------------
64 Original message
65 ----------------
66 EOF
67 
68 echo `{date} bounced $RECIP From `{cat $D/replyto} \
69 	>> /mail/box/$USER/_bounced >[2] /dev/null
70 
71 rv=$status
72 rm $TMP
73 exit $status