tkevans@fallst.UUCP (Tim Evans) (06/27/90)
For reasons I've never known, the vendor who installed our UNIX
system installed a non-standard mailer, which, among other things,
mangles the headers of third-party UUCP mail that passes through our system.
Not a very nice thing to do.
Unfortunately, I'm not a headers wizard--all I know is that people
complain about my system mangling their mail. I don't even know
what exactly is going wrong. :-(
Since I can't get the vendor to fix this (their contract doesn't
require them to support third party mail), I thought maybe someone
out there could help.
Remote mail is handled in this system by two shell scripts. The
first replaces the standard 4.2BSD 'rmail'. This delivers incoming
mail which arrives via UUCP. Here is the script:
START OF 'rmail' SCRIPT
:
echo "`date`: $*" >>/usr/adm/rmail.log
cd /tmp; umask 0066; E=0
LOCAL="`uuname -l`"
sed "1s/^From \\([^ ][^ ]*\\) \\(.*\\) remote from \\([^ ][^ ]*\).*/From \\3!\\1 ${LOCAL}.UUCP/" >/tmp/rmail.$$
SUBJ=`sed -n "1,/^Subject/s/^Subject:* \\(.*\\)$/\\1/p" </tmp/rmail.$$`
if /usr/bin/mail -R "$*" -s "$SUBJ" </tmp/rmail.$$ >/tmp/rmail.e.$$ 2>&1 ; then : ;
else if test -s /tmp/rmail.e.$$ ; then
LOCAL=`uuname -l`
SENDER=`sed -n "1s/^From \\([^ ][^ ]*\\) .*$/\\1/p" </tmp/rmail.$$`
( echo "Returned mail from rmail on \"${LOCAL}\"."
echo "Reason:"
cat /tmp/rmail.e.$$
echo ""
cat /tmp/rmail.$$
) | if /usr/bin/mail ${SENDER} -s "Undelivered mail." ; then : ; else E=1 ; fi
fi; fi
rm -f /tmp/rmail.$$ /tmp/rmail.e.$$
exit $E
This shell command file ("rmail") is designed to accept mail from UUX
and submit it to NetMail. It implements the UUCP convention of
moving the "sender" part of "remote from sender" to the beginning of
the "From" name. That is, from:
From pearson Fri Jan 10 00:29:36 1986 remote from cdstar
it gets:
cdstar!pearson
and creates a new first line:
From cdstar!pearson local.UUCP
(where "local" is the return from uuname -l.
The NetMail mail command is then called with a flag of -R.
For those familiar with standard Unix mail, in NetMail, rmail
is broken out of the mail command proper so that mail arriving
from sources other than uucp can be submitted. To handle mail
from other sources, all a command file has to do is prepare a new
first line beginning with "From", then the sender's (non-local, far)
network address, then a far-net node idenitfication, then pass
the letter to mail with the -R flag. Use the uucp version
above as a model. The Received-by line prepared with by the -R flag
will contain the name of the user executing the mail -R command,
so create a user to run the (non-local) network's local commands
(as is done for uucp).
END OF 'rmail' SCRIPT
Outgoing mail with remote addresses, inlcuding, of course, the
output of the 'rmail' script for third party mail, is passed to
another script the vendor calls 'nmremote'. Here is this
script:
START of 'nmremote' SCRIPT
:
# @(#) "nmremote" NetMail UUCP script
# called with
# nmremote host1!host2!name host3!name ...
# with message body coming from standard input
#############################
echo "`date`: $*" >>/usr/adm/nmfarmail.log
umask 0066
MAILFILE=/tmp/nmfarmail.$$
UUNAMEFILE=/tmp/nmfarmailu.$$
# Pathname of file for "@" lookups
# If you want to disable "@" facility, dont define this variable
# uses modified output of 'pathalias'
PATHSFILE=/usr/lib/uucp/paths.netmail
# Delete temporary files if an error
trap 'rm -f $MAILFILE $UUNAMEFILE; exit' 1 2 3 15
# Get my host name
LOCAL=`uuname -l`
# Copy message to /tmp/nmfarmail.$$ adding "remote from hostname" line
sed -e "1s/$/ remote from ${LOCAL}/" \
-e "1a\\
To: THE_REMOTE_NAME\\
" > $MAILFILE
# Remember valid uucp destinations
uuname > $UUNAMEFILE
#echo "$LOCAL" >> $UUNAMEFILE
# For each argument
for ARG do
# Copy ARG to a new variable
CURRENT="$ARG"
# If there's an '@', separate part before and after
if [ `echo "$CURRENT" | fgrep "@"` ]
then
if [ "$PATHSFILE" ]
then
# Do the lookup
ATPART=`echo "$CURRENT" | sed -e "s/[^@]*@//"`
AWKARG="{if (\$1 == \"$ATPART\") {print \$2; exit(0)}}"
PATHLIST=`awk "$AWKARG" $PATHSFILE`
else
# No file, mark as not found
PATHLIST=""
fi
# Check that '@' refers to a valid host path
if [ "$PATHLIST" ]
then
# Recreate $CURRENT
CURRENT=`echo "$CURRENT" | sed -e "s/@.*//"`
# CURRENT="$PATHSHOST"!"$PATHLIST"!"$CURRENT"
CURRENT="$PATHLIST"!"$CURRENT"
else
# Make it a bad value so won't find it later
CURRENT=UNKNOWNHOST!GARBAGE
fi
fi
# Separate part before first ! and after
USERNAME=`echo "$CURRENT" | sed -e "s/[^!]*!//"`
HOSTNAME=`echo "$CURRENT" | sed -e "s/!.*//"`
# Check if it's a local message or a valid hostname
if [ "$HOSTNAME" = "$LOCAL" ]
then sed "2s/THE_REMOTE_NAME/$ARG/" < $MAILFILE | mail ${USERNAME}
elif [ `fgrep -x "$HOSTNAME" < $UUNAMEFILE` ]
then
# It's valid, substitute in destination argument and send
sed "2s/THE_REMOTE_NAME/$ARG/" < $MAILFILE |
uux - "${HOSTNAME}!rmail (${USERNAME})"
else
# Invalid, return message
AUTHOR=`sed -n "1s/^From \\([^ ][^ ]*\\) .*$/\\1/p" < $MAILFILE`
( echo "Returned mail from NetMail farmailer on \"${LOCAL}\"."
echo "Reason: remote address \"$CURRENT\" not recognized."
echo ""
sed "2s/THE_REMOTE_NAME/$ARG/" < $MAILFILE
) | /usr/bin/mail $AUTHOR - -s "Returned mail."
fi
done
rm -f $MAILFILE $UUNAMEFILE
exit
--
UUCP: {rutgers|ames|uunet}!mimsy!woodb!fallst!tkevans
INTERNET: tkevans%fallst@wb3ffv.ampr.org
Tim Evans 2201 Brookhaven Ct, Fallston, MD 21047