Script to automatically install DJBDNS and dependencies on CentOS 6, should be easy to adapt to other OSes easily

install_djbdns.sh

#!/usr/bin/env bash

# Temporary directory to work in
TMPDIR="$HOME/tmp/djbdns"

# Where to install daemontools
PACKAGE="/package"

# Version numbers for packages
UCSPI_VERSION="0.88"
DAEMONTOOLS_VERSION="0.76"
DJBDNS_VERSION="1.05"

# IP to listen in, leave empty for auto-detect
IP=""

# ----- SCRIPT LOGIC ----- #


# Set up dependencies
echo "Installing dependencies (curl, gcc, make, rsync)"
yum -y install curl gcc make rsync

# Figure out my IP
if [[ -z "$IP" ]]; then
        echo "Querying ifconfig.me for your IP"
        IP=$(curl ifconfig.me)
        echo "Detected it as $IP"
fi

# Create our folders
echo "Initializing environment"
mkdir -p "$TMPDIR"
mkdir -p "$PACKAGE"

# Set up some permissions
chmod 1755 "$PACKAGE"

cd "$TMPDIR"

echo "Downloading packages"
curl -O "http://cr.yp.to/ucspi-tcp/ucspi-tcp-$UCSPI_VERSION.tar.gz"
curl -O "http://cr.yp.to/daemontools/daemontools-$DAEMONTOOLS_VERSION.tar.gz"
curl -O "http://cr.yp.to/djbdns/djbdns-$DJBDNS_VERSION.tar.gz"

echo "Extracting packages"
tar -zxf "ucspi-tcp-$USCPI_VERSION.tar.gz"
tar -zxf "djbdns-$DJBDNS_VERSION.tar.gz"

cd "$PACKAGE"
tar -zxf "$TMPDIR/daemontools-$DAEMONTOOLS_VERSION.tar.gz"

# At least CentOS needs a slightly patched compilation, so we can patch that here
#if [[ -f "/etc/centos-release" ]]; then
        echo "Patching CC configuration"
        ccpatch="gcc -O2 -include /usr/include/errno.h"
        echo "$ccpatch" > "$PACKAGE/admin/daemontools-$DAEMONTOOLS_VERSION/src/conf-cc"
        echo "$ccpatch" > "$TMPDIR/ucspi-tcp-$UCSPI_VERSION/conf-cc"
        echo "$ccpatch" > "$TMPDIR/djbdns-$DJBDNS_VERSION/conf-cc"
#fi

# Build and install daemontools
echo "Building and installing daemontools"
cd "$PACKAGE/admin/daemontools-$DAEMONTOOLS_VERSION"
package/install

# Build and install ucspi-tcp
echo "Building and installing ucspi-tcp"
cd "$TMPDIR/ucspi-tcp-$UCSPI_VERSION"
make setup check

# Build and install djbdns
echo "Building and installing djbdns"
cd "$TMPDIR/djbdns-$DJBDNS_VERSION"
make setup check

# Set up user
echo "Creating tinydns user"
adduser tinydns

# Configure tinydns
echo "Configuring tinydns"
tinydns-conf tinydns tinydns /usr/local/tinydns-nsN "$IP"

echo "Enabling service"
ln -s /usr/local/tinydns-nsN /service/tinydns

echo "Starting svscanboot"
svscanboot &

echo "Starting service"
svc -u /service/tinydns

echo "Checking for listening"
sleep 0.1
netstat -lpn | grep tinydns

echo "If you can see TinyDNS listening above, then we're all done."
echo "If not, there's probably an error somewhere above."