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#!/bin/sh
#
# This script is called when dhcp connects to the network.
#
# Here is where we'll start sendmail if needed, and will
# run the queue in either case.
#
# Written By Richard Nelson <cowboy@debian.org>
#
# NOTE: The following lines (without the #) must be in /etc/mail/sendmail.mc:
# include(`/etc/mail/dialup.m4')dnl
# include(`/etc/mail/provider.m4')dnl
#
# NOTE: The dhcp DNS name is used as the peer name in /etc/mail/peers.
#
# Exit by default, check for validity before commenting out the next line:
exit 0;
provider_m4='/etc/mail/provider.m4';
#provider_m4='provider.m4';
dialup_m4='/etc/mail/dialup.m4';
#dialup_m4='dialup.m4';
update_sendmail() {
# Build a new sendmail.cf from sendmail.mc, including our address.
m4 /etc/mail/sendmail.mc \
> /etc/mail/sendmail.cf.pnew;
chmod 0644 /etc/mail/sendmail.cf.pnew;
chown mail:mail /etc/mail/sendmail.cf.pnew;
mv -f /etc/mail/sendmail.cf.pnew /etc/mail/sendmail.cf;
# Purge any latent host status that might cause us to *NOT* send mail
AM='-Am';
if [ ! -f /usr/share/sendmail/cf/feature/msp.m4 ]; then
AM='';
fi;
sendmail $AM -bH -O Timeout.hoststatus=1s;
# Start/reload sendmail as needed
/etc/init.d/sendmail reload; # may be up, or down
# Process the sendmail queue
# (background so as to not defer other ip-up work)
runq &
};
update_provider() {
# Add smarthost information (if any)...
# But not if provider.m4 is a link !
local domain;
domain="$1";
if [ -f /etc/mail/peers/$domain -a ! -L $provider_m4 ]; then
cat <<-EOT > $provider_m4;
LOCAL_CONFIG
#------------------------------------------------------------
#
# Dynamic provider updates from $0
#
# NOTE: the following line *MUST* be in /etc/mail/sendmail.mc
dnl include(\`/etc/mail/provider.m4')dnl
#
# Provider information from /etc/mail/peers/$domain
EOT
cat /etc/mail/peers/$domain >> $provider_m4;
cat <<-EOT >> $provider_m4;
#------------------------------------------------------------
EOT
fi;
};
find_host() {
# Determine our fqdn from our ISP
local addr;
addr="$1";
maxloop=20;
cntr=0;
host='';
until (test ! -z "$host"); do
cntr=$(($cntr+1));
rev=$(host $addr);
host=$(echo "$rev" | grep '^Name:' | awk '{print $2}');
if [ -z "$host" ]; then
host=${rev##*domain name pointer };
host=${host%.};
fi;
test=$(echo $host | cut -d ' ' -f 1);
if [ "$host" != "**" ]; then
break;
elif (($cntr > $maxloop)); then
host='';
break;
fi;
done;
echo "addr=$addr, name=$host";
};
update_host() {
local host ip;
ip="$1";
find_host "$ip";
if [ ! -z "$host" ]; then
cat <<-EOT > $dialup_m4;
LOCAL_CONFIG
#------------------------------------------------------------
#
# Dynamic host/ip updates from $0
#
# NOTE: the following line *MUST* be in /etc/mail/sendmail.mc
dnl include(\`/etc/mail/dialup.m4')dnl
#
# Chose one of the following two options:
# * Add our true hostname as a Virtual Host (we'll accept
# mail for it, but keep our local name for SMTP AUTH, etc)
C{VirtHost}$host
#
# * Define our true hostname (from our ISP) - becomes \$j
dnl define(\`confDOMAIN_NAME', \`$host')dnl
#
# Make sure we accept mail as this name (for bounces, etc)
Cw$host
Cw$ip
# Add our hostname to class G for genericstable support
CG$host
#------------------------------------------------------------
EOT
fi;
};
# No need to continue if we're called with an unsupported option
if [ "$reason" != BOUND ] && [ "$reason" != RENEW ] \
&& [ "$reason" != REBIND ] && [ "$reason" != REBOOT ] \
&& [ "$reason" != EXPIRE ] && [ "$reason" != FAIL ]
then
return;
fi;
# Flag to denote changed have been made;
changed=0;
# If the domain name has changed, update the provider information
if [ "$new_domain_name" != "$old_domain_name" ]; then
changed=1;
update_provider "$new_domain_name";
fi;
# If the ip address has changed, update the host information
if [ "$new_ip_address" != "$oldnew_ip_address" ]; then
changed=1;
update_host "$new_ip_address";
fi;
# If anything has been changed, update sendmail.cf and reload
if [ $changed -eq 1 ]; then
update_sendmail;
fi;
exit 0;
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