# CHECKLOCALRCVD.RC
#
#  Function to check IPs extracted from a single Received: header
#  and determine whether the header was added locally, added
#  remotely, or is the header that shows the "handoff" between
#  the remote system and your local system.  That header is
#  the most important of the headers.

CHKLOCAL=no

# Check to see if the email is from a local IP.
#
:0
* ! LOCALIP ?? ^000\.000\.000\.000$
* ? ${TEST} -f ${LOCALHOSTFILE}
{
 :0
 * LOCALHOSTCHECKING ?? STRICT
 * ? ${GREP} -i -x "${LOCALIP}" ${LOCALHOSTFILE}
 { CHKLOCAL=yes }

 :0
 * LOCALHOSTCHECKING ?? RELAXED
 * ? ${EGREP} -e "^${LOCAL24}.[0-9][0-9]?[0-9]?$" ${LOCALHOSTFILE}
 { CHKLOCAL=yes }
}

# Check to see if the email is from a local sender.
#
:0
* CHKLOCAL ?? no
* ! LOCALSENDER ?? ^host\.example\.com$
* ? ${TEST} -f ${LOCALHOSTFILE}
{
 :0
 * LOCALHOSTCHECKING ?? STRICT
 * ? ${GREP} -i -x "${LOCALSENDER}" ${LOCALHOSTFILE}
 { CHKLOCAL=yes }

 :0
 * LOCALHOSTCHECKING ?? RELAXED
 * ? ${GREP} -i "${LOCALSENDER}$" ${LOCALHOSTFILE}
 { CHKLOCAL=yes }
}

:0
* CHKLOCAL ?? no
* ! DOMAIN ?? UNSET
* $ LOCALSENDER ?? ${DOMAIN}$
{ CHKLOCAL=yes }

:0
* CHKLOCAL ?? no
* ! THISISP ?? UNSET
* $ LOCALSENDER ?? ${THISISP}$
{ CHKLOCAL=yes }

# Check to ensure that the IP you're looking at is not an ICANN non-routable
# IP address.

CHKNONROUTABLE=no
LT2=no
TESTCIDR=${SBDIR}/info/icann-nonroutable-ips.cidr
INCLUDERC=${SBDIR}/functions/check-cidr.rc
CHKNONROUTABLE=${LT2}

:0
* CHKLOCAL ?? no
* CHKNONROUTABLE ?? yes
{
 CHKLOCAL=yes
}