Add option to install Unbound to Pi-hole (#2425)

install/pihole-install.sh

@@ -42,6 +42,64 @@ EOF
 $STD bash <(curl -fsSL https://install.pi-hole.net) --unattended
 msg_ok "Installed Pi-hole"
 
+read -r -p "Would you like to add Unbound? <y/N> " prompt
+if [[ ${prompt,,} =~ ^(y|yes)$ ]]; then
+  msg_info "Installing Unbound"
+  $STD apt-get install -y unbound
+  cat <<EOF >/etc/unbound/unbound.conf.d/pi-hole.conf
+server:
+  verbosity: 0
+  interface: 0.0.0.0
+  port: 5335
+  do-ip6: no
+  do-ip4: yes
+  do-udp: yes
+  do-tcp: yes
+  num-threads: 1
+  hide-identity: yes
+  hide-version: yes
+  harden-glue: yes
+  harden-dnssec-stripped: yes
+  harden-referral-path: yes
+  use-caps-for-id: no
+  harden-algo-downgrade: no
+  qname-minimisation: yes
+  aggressive-nsec: yes
+  rrset-roundrobin: yes
+  cache-min-ttl: 300
+  cache-max-ttl: 14400
+  msg-cache-slabs: 8
+  rrset-cache-slabs: 8
+  infra-cache-slabs: 8
+  key-cache-slabs: 8
+  serve-expired: yes
+  serve-expired-ttl: 3600
+  edns-buffer-size: 1232
+  prefetch: yes
+  prefetch-key: yes
+  target-fetch-policy: "3 2 1 1 1"
+  unwanted-reply-threshold: 10000000
+  rrset-cache-size: 256m
+  msg-cache-size: 128m
+  so-rcvbuf: 1m
+  private-address: 192.168.0.0/16
+  private-address: 169.254.0.0/16
+  private-address: 172.16.0.0/12
+  private-address: 10.0.0.0/8
+  private-address: fd00::/8
+  private-address: fe80::/10
+EOF
+  mkdir -p /etc/dnsmasq.d/
+  cat <<EOF >/etc/dnsmasq.d/99-edns.conf
+edns-packet-max=1232
+EOF
+  wget -q https://www.internic.net/domain/named.root >/var/lib/unbound/root.hints
+  sed -i -e 's/PIHOLE_DNS_1=8.8.8.8/PIHOLE_DNS_1=127.0.0.1#5335/' -e 's/PIHOLE_DNS_2=8.8.4.4/#PIHOLE_DNS_2=8.8.4.4/' /etc/pihole/setupVars.conf
+  systemctl enable -q --now unbound
+  systemctl restart pihole-FTL.service
+  msg_ok "Installed Unbound"
+fi
+
 motd_ssh
 customize