Re: How to manager different network environments?

[Auke Jilderda <jilderda@dds.nl>]

Derek, 

I already took a shot at extending Andrew's script for use with Exim.
Have a look at my updated version of "setmailrelay", it's not complete
but works in my setup.  We'll need to make it a bit more robust
(handling the standard distributed config file of Exim in which the
"queue_remote_domains" option isn't mentioned.


Auke

On Wed, Oct 30, 2002 at 09:03:17AM -0400, Derek Broughton wrote:
> From: "Andrew McMillan" <andrew@catalyst.net.nz>
> > Unfortunately it isn't quite that straightforward.  The setmailrelay
> > script needs to update the configuration file for exim, make changes so
> > that mail is relayed differently, and then restart it.
> >
> > It isn't _hard_ but Exim isn't compatible with sendmail at the
> > configuration file level, unless I miss my guess.
> 
> oh... 'fraid so.  The Exim configuration is, imo, a whole lot simpler
> - but that doesn't mean applying config changes for sendmail is going
> to work :-)  Having opened my mouth when I shouldn't, I'll take a look
> at setmailrelay and see what it would need to work with Exim :-)
> 
> derek

-- 
PGP: 0x4A34DD6D, http://bunny.sourceforge.net/

#!/bin/bash 

# This script was written originally by Jos Visser http://www.josv.com/~josv/
# and I have modified it a little to make it slightly more generic
#    - Andrew McMillan 10 August 1999
# Postfix support by Chris Halls, August 2001
#
# Usage:
#   setmailrelay none   
#       - You have a permanent internet connection, do not use a mail relay
#   setmailrelay <relay>
#       - Relay to specified host
#   setmailrelay queue [<relay>]
#       - Do not send, place on the queue.  When the queue is flushed, mail
#         will be relayed to <relay>, or $DEFAULT_RELAY if not specified


# Where are the config files for your mailer?  Can override in mail-relay.conf
SENDMAIL_CONFFILE=/etc/mail/sendmail.cf
POSTFIX_CONFFILE=/etc/postfix/main.cf
EXIM_CONFFILE=/etc/exim/exim.conf

. /etc/whereami/mail-relay.conf

RELAY="$1"
QUEUE_RELAY="${2:-${DEFAULT_RELAY}}"

# check for a "parameter=" line in a file, add it if it does not exist
#    check_for_line(file, parameter)
check_for_parameter()
{
    FILE="$1"
    PARAM="$2"

    if egrep -q "^$PARAM *=" "$FILE" ; then :
    else
        echo "$PARAM=" >> "$FILE"
    fi
}

echo "Setting mail relay host ($RELAY)" 

if [ -f $SENDMAIL_CONFFILE ] ; then

        if [ -f /var/run/sendmail.pid ]; then 
                pid=$(head -1 /var/run/sendmail.pid)
                kill $pid
                sleep 3
                rm /var/run/sendmail.pid
        fi 

        if [ "$RELAY" = "none" ]; then 
                MODE=background 
                QUEUE_RUN="-q5m" 
                RELAY=""
        elif [ "$RELAY" = "queue" ]; then 
                MODE=deferred 
                QUEUE_RUN="" 
                RELAY="smtp:${DEFAULT_RELAY}"
        else 
                MODE=background 
                QUEUE_RUN="-q5m" 
                RELAY="smtp:$RELAY" 
        fi


        sed -e "s/^DS.*\$/DS$RELAY/" \
            -e "s/^O DeliveryMode=.*\$/O DeliveryMode=$MODE/" \
            <$SENDMAIL_CONFFILE >$SENDMAIL_CONFFILE.N

        # Make a backup copy
        mv -f $SENDMAIL_CONFFILE $SENDMAIL_CONFFILE.whereami

        mv $SENDMAIL_CONFFILE.N $SENDMAIL_CONFFILE

        `which sendmail` -bd $QUEUE_RUN 

fi

if [ -f $POSTFIX_CONFFILE ] ; then

        if [ "$RELAY" = "none" ]; then 
                DEFER=""
                DISABLE_LOOKUPS="no"
                RELAY=""
        elif [ "$RELAY" = "queue" ]; then 
                DEFER="smtp"
                DISABLE_LOOKUPS="yes"
                RELAY="$DEFAULT_RELAY"
        else 
                DEFER=""
                DISABLE_LOOKUPS="yes"
                MODE=background 
                RELAY="$RELAY"
        fi

        # Add paramters to config file if they do not exist
        check_for_parameter $POSTFIX_CONFFILE "defer_transports"
        check_for_parameter $POSTFIX_CONFFILE "disable_dns_lookups"
        check_for_parameter $POSTFIX_CONFFILE "relayhost"

        sed -e "s/^defer_transports *=.*\$/defer_transports=$DEFER/" \
            -e "s/^disable_dns_lookups *=.*\$/disable_dns_lookups=$DISABLE_LOOKUPS/" \
            -e "s/^relayhost *=.*\$/relayhost=$RELAY/" \
            < $POSTFIX_CONFFILE > $POSTFIX_CONFFILE.N

        # Make a backup copy
        mv -f $POSTFIX_CONFFILE $POSTFIX_CONFFILE.whereami

        mv $POSTFIX_CONFFILE.N $POSTFIX_CONFFILE

        # Reload config
        /etc/init.d/postfix reload

        if [ "$RELAY" != "queue" ]; then
            # Run mail queue
            /etc/init.d/postfix flush
        fi

fi

if [ -f $EXIM_CONFFILE ] ; then

        if [ "$RELAY" = "none" ]; then 
                DEFER="# queue_remote_domains = *"
                RELAY="$DEFAULT_RELAY"
        elif [ "$RELAY" = "queue" ]; then 
                DEFER="queue_remote_domains = *"
                RELAY="$DEFAULT_RELAY"
        else 
                DEFER="# queue_remote_domains = *"
                RELAY="$RELAY"
        fi

        # add parameters to configuration file if they do not exist
        #check_for_parameter $EXIM_CONFFILE "queue_remote_domains"
        #check_for_parameter $EXIM_CONFFILE "route_list"

        sed -e "s/^.*queue_remote_domains *=.*\$/$DEFER/" \
            -e "s/route_list *=.*\$/route_list = \"* $RELAY bydns_a\"/" \
            < $EXIM_CONFFILE > $EXIM_CONFFILE.N

        # make a backup copy of configuration file
        mv -f $EXIM_CONFFILE $EXIM_CONFFILE.whereami
        mv $EXIM_CONFFILE.N $EXIM_CONFFILE

        # reload configuration
        /etc/init.d/exim reload

        if [ "$RELAY" != "queue" ]; then
            # flush queued mails
            exim -qff
        fi

fi

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