Server

interne Domains und DHCP mit dnsmasq

Konfiguration #

/usr/local/sbin/update-dnsmasq-hostsfile.sh:

#!/bin/bash

# dnsmasq configuration directory
CONF_DIR=/etc/dnsmasq.d/dhcp-dns-static

function getCurrentVersion() {
# Get hash from latest revision
git log --format=format:%H -1
}

function reverseIp6 { # https://gist.github.com/lsowen/4447d916fd19cbb7fce4
  while read -r host ip; do
    ptr=$(echo "$ip" | awk -F: 'BEGIN {OFS=""; }{addCount = 9 - NF; for(i=1; i<=NF;i++){if(length($i) == 0){ for(j=1;j<=addCount;j++){$i = ($i "0000");} } else { $i = substr(("0000" $i), length($i)+5-4);}}; print}' | rev | sed -e "s/./&./g")
    echo "ptr-record=${ptr}ip6.arpa,${host}"
  done
}

cd $CONF_DIR

# Get current version hash
GIT_REVISION=$(getCurrentVersion)

# Automagically commit local changes
# This preserves local changes
git commit -m "CRON: auto commit"

# Pull latest changes from upstream
git fetch
git merge origin/master -m "Auto Merge"

# Get new version hash
GIT_NEW_REVISION=$(getCurrentVersion)

echo "old: $GIT_REVISION"
echo "new: $GIT_NEW_REVISION"

if [ $GIT_REVISION != $GIT_NEW_REVISION ]
then
  # Reload updated configuration
  echo "Reload dnsmasq configuration."
  cat $CONF_DIR/ffggrz-dns.conf | sed -r 's/^address=\/([^\/]*).*\/([0-9]*)\.([0-9]*)\.([0-9]*)\.([0-9]*)$/ptr-record=\5.\4.\3.\2.in-addr.arpa,\1./' | grep '^ptr-record' > $CONF_DIR/ptr_records_from_static
  sed -r 's/^address=\/([^\/]*).*\/([^\/]*)$/\1 \2/' $CONF_DIR/ffggrz-dns.conf | grep -E ' (fdb5|2a03):' | reverseIp6 >> $CONF_DIR/ptr_records_from_static

  dnsmasq --test
  if [ $? -eq 0 ]; then
    systemctl restart dnsmasq
  else
    echo "dnsmasq not restartet!"
  fi
fi

/etc/cron.d/freifunk:

PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
*/15 * * * * root /usr/local/sbin/update-dnsmasq-hostsfile.sh > /dev/null

/etc/dnsmasq.conf:

conf-dir=/etc/dnsmasq.d/dhcp-dns-static,.md

Befehle #

chmod 755 /usr/local/sbin/update-dnsmasq-hostsfile.sh
mkdir /etc/dnsmasq.d/dhcp-dns-static/
cd /etc/dnsmasq.d/dhcp-dns-static/
git clone https://github.com/ffggrz/dhcp-dns-static.git .
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