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basic-install.sh
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basic-install.sh
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#!/usr/bin/env bash
# shellcheck disable=SC1090
# Pi-hole: A black hole for Internet advertisements
# (c) Pi-hole (https://pi-hole.net)
# Network-wide ad blocking via your own hardware.
#
# Installs and Updates Pi-hole
#
# This file is copyright under the latest version of the EUPL.
# Please see LICENSE file for your rights under this license.
# pi-hole.net/donate
#
# Install with this command (from your Linux machine):
#
# curl -sSL https://install.pi-hole.net | bash
# -e option instructs bash to immediately exit if any command [1] has a non-zero exit status
# We do not want users to end up with a partially working install, so we exit the script
# instead of continuing the installation with something broken
set -e
# Append common folders to the PATH to ensure that all basic commands are available.
# When using "su" an incomplete PATH could be passed: https://github.com/pi-hole/pi-hole/issues/3209
export PATH+=':/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'
######## VARIABLES #########
# For better maintainability, we store as much information that can change in variables
# This allows us to make a change in one place that can propagate to all instances of the variable
# These variables should all be GLOBAL variables, written in CAPS
# Local variables will be in lowercase and will exist only within functions
# It's still a work in progress, so you may see some variance in this guideline until it is complete
# Dialog result codes
# dialog code values can be set by environment variables, we only override if
# the env var is not set or empty.
: "${DIALOG_OK:=0}"
: "${DIALOG_CANCEL:=1}"
: "${DIALOG_ESC:=255}"
# List of supported DNS servers
DNS_SERVERS=$(cat << EOM
Google (ECS, DNSSEC);8.8.8.8;8.8.4.4;2001:4860:4860:0:0:0:0:8888;2001:4860:4860:0:0:0:0:8844
OpenDNS (ECS, DNSSEC);208.67.222.222;208.67.220.220;2620:119:35::35;2620:119:53::53
Level3;4.2.2.1;4.2.2.2;;
Comodo;8.26.56.26;8.20.247.20;;
DNS.WATCH (DNSSEC);84.200.69.80;84.200.70.40;2001:1608:10:25:0:0:1c04:b12f;2001:1608:10:25:0:0:9249:d69b
Quad9 (filtered, DNSSEC);9.9.9.9;149.112.112.112;2620:fe::fe;2620:fe::9
Quad9 (unfiltered, no DNSSEC);9.9.9.10;149.112.112.10;2620:fe::10;2620:fe::fe:10
Quad9 (filtered, ECS, DNSSEC);9.9.9.11;149.112.112.11;2620:fe::11;2620:fe::fe:11
Cloudflare (DNSSEC);1.1.1.1;1.0.0.1;2606:4700:4700::1111;2606:4700:4700::1001
EOM
)
# Location for final installation log storage
installLogLoc="/etc/pihole/install.log"
# This is an important file as it contains information specific to the machine it's being installed on
setupVars="/etc/pihole/setupVars.conf"
# Pi-hole uses lighttpd as a Web server, and this is the config file for it
lighttpdConfig="/etc/lighttpd/lighttpd.conf"
# This is a file used for the colorized output
coltable="/opt/pihole/COL_TABLE"
# Root of the web server
webroot="/var/www/html"
# We clone (or update) two git repositories during the install. This helps to make sure that we always have the latest versions of the relevant files.
# AdminLTE is used to set up the Web admin interface.
# Pi-hole contains various setup scripts and files which are critical to the installation.
# Search for "PI_HOLE_LOCAL_REPO" in this file to see all such scripts.
# Two notable scripts are gravity.sh (used to generate the HOSTS file) and advanced/Scripts/webpage.sh (used to install the Web admin interface)
webInterfaceGitUrl="https://github.com/pi-hole/AdminLTE.git"
webInterfaceDir="${webroot}/admin"
piholeGitUrl="https://github.com/pi-hole/pi-hole.git"
PI_HOLE_LOCAL_REPO="/etc/.pihole"
# List of pihole scripts, stored in an array
PI_HOLE_FILES=(chronometer list piholeDebug piholeLogFlush setupLCD update version gravity uninstall webpage)
# This directory is where the Pi-hole scripts will be installed
PI_HOLE_INSTALL_DIR="/opt/pihole"
PI_HOLE_CONFIG_DIR="/etc/pihole"
PI_HOLE_BIN_DIR="/usr/local/bin"
PI_HOLE_404_DIR="${webroot}/pihole"
FTL_CONFIG_FILE="${PI_HOLE_CONFIG_DIR}/pihole-FTL.conf"
if [ -z "$useUpdateVars" ]; then
useUpdateVars=false
fi
adlistFile="/etc/pihole/adlists.list"
# Pi-hole needs an IP address; to begin, these variables are empty since we don't know what the IP is until this script can run
IPV4_ADDRESS=${IPV4_ADDRESS}
IPV6_ADDRESS=${IPV6_ADDRESS}
# Give settings their default values. These may be changed by prompts later in the script.
QUERY_LOGGING=true
INSTALL_WEB_INTERFACE=true
PRIVACY_LEVEL=0
CACHE_SIZE=10000
if [ -z "${USER}" ]; then
USER="$(id -un)"
fi
# dialog dimensions: Let dialog handle appropriate sizing.
r=20
c=70
######## Undocumented Flags. Shhh ########
# These are undocumented flags; some of which we can use when repairing an installation
# The runUnattended flag is one example of this
reconfigure=false
runUnattended=false
INSTALL_WEB_SERVER=true
# Check arguments for the undocumented flags
for var in "$@"; do
case "$var" in
"--reconfigure" ) reconfigure=true;;
"--unattended" ) runUnattended=true;;
"--disable-install-webserver" ) INSTALL_WEB_SERVER=false;;
esac
done
# If the color table file exists,
if [[ -f "${coltable}" ]]; then
# source it
source "${coltable}"
# Otherwise,
else
# Set these values so the installer can still run in color
COL_NC='\e[0m' # No Color
COL_LIGHT_GREEN='\e[1;32m'
COL_LIGHT_RED='\e[1;31m'
TICK="[${COL_LIGHT_GREEN}✓${COL_NC}]"
CROSS="[${COL_LIGHT_RED}✗${COL_NC}]"
INFO="[i]"
# shellcheck disable=SC2034
DONE="${COL_LIGHT_GREEN} done!${COL_NC}"
OVER="\\r\\033[K"
fi
# A simple function that just echoes out our logo in ASCII format
# This lets users know that it is a Pi-hole, LLC product
show_ascii_berry() {
echo -e "
${COL_LIGHT_GREEN}.;;,.
.ccccc:,.
:cccclll:. ..,,
:ccccclll. ;ooodc
'ccll:;ll .oooodc
.;cll.;;looo:.
${COL_LIGHT_RED}.. ','.
.',,,,,,'.
.',,,,,,,,,,.
.',,,,,,,,,,,,....
....''',,,,,,,'.......
......... .... .........
.......... ..........
.......... ..........
......... .... .........
........,,,,,,,'......
....',,,,,,,,,,,,.
.',,,,,,,,,'.
.',,,,,,'.
..'''.${COL_NC}
"
}
is_command() {
# Checks to see if the given command (passed as a string argument) exists on the system.
# The function returns 0 (success) if the command exists, and 1 if it doesn't.
local check_command="$1"
command -v "${check_command}" >/dev/null 2>&1
}
os_check() {
if [ "$PIHOLE_SKIP_OS_CHECK" != true ]; then
# This function gets a list of supported OS versions from a TXT record at versions.pi-hole.net
# and determines whether or not the script is running on one of those systems
local remote_os_domain valid_os valid_version valid_response detected_os detected_version display_warning cmdResult digReturnCode response
remote_os_domain=${OS_CHECK_DOMAIN_NAME:-"versions.pi-hole.net"}
detected_os=$(grep '^ID=' /etc/os-release | cut -d '=' -f2 | tr -d '"')
detected_version=$(grep VERSION_ID /etc/os-release | cut -d '=' -f2 | tr -d '"')
cmdResult="$(dig +short -t txt "${remote_os_domain}" @ns1.pi-hole.net 2>&1; echo $?)"
# Gets the return code of the previous command (last line)
digReturnCode="${cmdResult##*$'\n'}"
if [ ! "${digReturnCode}" == "0" ]; then
valid_response=false
else
# Dig returned 0 (success), so get the actual response, and loop through it to determine if the detected variables above are valid
response="${cmdResult%%$'\n'*}"
# If the value of ${response} is a single 0, then this is the return code, not an actual response.
if [ "${response}" == 0 ]; then
valid_response=false
fi
IFS=" " read -r -a supportedOS < <(echo "${response}" | tr -d '"')
for distro_and_versions in "${supportedOS[@]}"
do
distro_part="${distro_and_versions%%=*}"
versions_part="${distro_and_versions##*=}"
# If the distro part is a (case-insensitive) substring of the computer OS
if [[ "${detected_os^^}" =~ ${distro_part^^} ]]; then
valid_os=true
IFS="," read -r -a supportedVer <<<"${versions_part}"
for version in "${supportedVer[@]}"
do
if [[ "${detected_version}" =~ $version ]]; then
valid_version=true
break
fi
done
break
fi
done
fi
if [ "$valid_os" = true ] && [ "$valid_version" = true ] && [ ! "$valid_response" = false ]; then
display_warning=false
fi
if [ "$display_warning" != false ]; then
if [ "$valid_response" = false ]; then
if [ "${digReturnCode}" -eq 0 ]; then
errStr="dig succeeded, but response was blank. Please contact support"
else
errStr="dig failed with return code ${digReturnCode}"
fi
printf " %b %bRetrieval of supported OS list failed. %s. %b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${errStr}" "${COL_NC}"
printf " %bUnable to determine if the detected OS (%s %s) is supported%b\\n" "${COL_LIGHT_RED}" "${detected_os^}" "${detected_version}" "${COL_NC}"
printf " Possible causes for this include:\\n"
printf " - Firewall blocking certain DNS lookups from Pi-hole device\\n"
printf " - ns1.pi-hole.net being blocked (required to obtain TXT record from versions.pi-hole.net containing supported operating systems)\\n"
printf " - Other internet connectivity issues\\n"
else
printf " %b %bUnsupported OS detected: %s %s%b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${detected_os^}" "${detected_version}" "${COL_NC}"
printf " If you are seeing this message and you do have a supported OS, please contact support.\\n"
fi
printf "\\n"
printf " %bhttps://docs.pi-hole.net/main/prerequisites/#supported-operating-systems%b\\n" "${COL_LIGHT_GREEN}" "${COL_NC}"
printf "\\n"
printf " If you wish to attempt to continue anyway, you can try one of the following commands to skip this check:\\n"
printf "\\n"
printf " e.g: If you are seeing this message on a fresh install, you can run:\\n"
printf " %bcurl -sSL https://install.pi-hole.net | sudo PIHOLE_SKIP_OS_CHECK=true bash%b\\n" "${COL_LIGHT_GREEN}" "${COL_NC}"
printf "\\n"
printf " If you are seeing this message after having run pihole -up:\\n"
printf " %bsudo PIHOLE_SKIP_OS_CHECK=true pihole -r%b\\n" "${COL_LIGHT_GREEN}" "${COL_NC}"
printf " (In this case, your previous run of pihole -up will have already updated the local repository)\\n"
printf "\\n"
printf " It is possible that the installation will still fail at this stage due to an unsupported configuration.\\n"
printf " If that is the case, you can feel free to ask the community on Discourse with the %bCommunity Help%b category:\\n" "${COL_LIGHT_RED}" "${COL_NC}"
printf " %bhttps://discourse.pi-hole.net/c/bugs-problems-issues/community-help/%b\\n" "${COL_LIGHT_GREEN}" "${COL_NC}"
printf "\\n"
exit 1
else
printf " %b %bSupported OS detected%b\\n" "${TICK}" "${COL_LIGHT_GREEN}" "${COL_NC}"
fi
else
printf " %b %bPIHOLE_SKIP_OS_CHECK env variable set to true - installer will continue%b\\n" "${INFO}" "${COL_LIGHT_GREEN}" "${COL_NC}"
fi
}
# This function waits for dpkg to unlock, which signals that the previous apt-get command has finished.
test_dpkg_lock() {
i=0
printf " %b Waiting for package manager to finish (up to 30 seconds)\\n" "${INFO}"
# fuser is a program to show which processes use the named files, sockets, or filesystems
# So while the lock is held,
while fuser /var/lib/dpkg/lock >/dev/null 2>&1
do
# we wait half a second,
sleep 0.5
# increase the iterator,
((i=i+1))
# exit if waiting for more then 30 seconds
if [[ $i -gt 60 ]]; then
printf " %b %bError: Could not verify package manager finished and released lock. %b\\n" "${CROSS}" "${COL_LIGHT_RED}" "${COL_NC}"
printf " Attempt to install packages manually and retry.\\n"
exit 1;
fi
done
# and then report success once dpkg is unlocked.
return 0
}
# Compatibility
package_manager_detect() {
# TODO - pull common packages for both distributions out into a common variable, then add
# the distro-specific ones below.
# First check to see if apt-get is installed.
if is_command apt-get ; then
# Set some global variables here
# We don't set them earlier since the installed package manager might be rpm, so these values would be different
PKG_MANAGER="apt-get"
# A variable to store the command used to update the package cache
UPDATE_PKG_CACHE="${PKG_MANAGER} update"
# The command we will use to actually install packages
PKG_INSTALL=("${PKG_MANAGER}" -qq --no-install-recommends install)
# grep -c will return 1 if there are no matches. This is an acceptable condition, so we OR TRUE to prevent set -e exiting the script.
PKG_COUNT="${PKG_MANAGER} -s -o Debug::NoLocking=true upgrade | grep -c ^Inst || true"
# Update package cache
update_package_cache || exit 1
# Check for and determine version number (major and minor) of current php install
local phpVer="php"
if is_command php ; then
phpVer="$(php <<< "<?php echo PHP_VERSION ?>")"
# Check if the first character of the string is numeric
if [[ ${phpVer:0:1} =~ [1-9] ]]; then
printf " %b Existing PHP installation detected : PHP version %s\\n" "${INFO}" "${phpVer}"
printf -v phpInsMajor "%d" "$(php <<< "<?php echo PHP_MAJOR_VERSION ?>")"
printf -v phpInsMinor "%d" "$(php <<< "<?php echo PHP_MINOR_VERSION ?>")"
phpVer="php$phpInsMajor.$phpInsMinor"
else
printf " %b No valid PHP installation detected!\\n" "${CROSS}"
printf " %b PHP version : %s\\n" "${INFO}" "${phpVer}"
printf " %b Aborting installation.\\n" "${CROSS}"
exit 1
fi
fi
# Packages required to perform the os_check (stored as an array)
OS_CHECK_DEPS=(grep dnsutils)
# Packages required to run this install script (stored as an array)
INSTALLER_DEPS=(git iproute2 dialog ca-certificates)
# Packages required to run Pi-hole (stored as an array)
PIHOLE_DEPS=(cron curl iputils-ping psmisc sudo unzip idn2 libcap2-bin dns-root-data libcap2 netcat-openbsd procps jq)
# Packages required for the Web admin interface (stored as an array)
# It's useful to separate this from Pi-hole, since the two repos are also setup separately
PIHOLE_WEB_DEPS=(lighttpd "${phpVer}-common" "${phpVer}-cgi" "${phpVer}-sqlite3" "${phpVer}-xml" "${phpVer}-intl")
# Prior to PHP8.0, JSON functionality is provided as dedicated module, required by Pi-hole AdminLTE: https://www.php.net/manual/json.installation.php
if [[ -z "${phpInsMajor}" || "${phpInsMajor}" -lt 8 ]]; then
PIHOLE_WEB_DEPS+=("${phpVer}-json")
fi
# The Web server user,
LIGHTTPD_USER="www-data"
# group,
LIGHTTPD_GROUP="www-data"
# and config file
LIGHTTPD_CFG="lighttpd.conf.debian"
# If apt-get is not found, check for rpm.
elif is_command rpm ; then
# Then check if dnf or yum is the package manager
if is_command dnf ; then
PKG_MANAGER="dnf"
elif is_command yum ; then
PKG_MANAGER="yum"
elif is_command zypper ; then
PKG_MANAGER="zypper"
fi
# These variable names match the ones for apt-get. See above for an explanation of what they are for.
PKG_INSTALL=("${PKG_MANAGER}" install -y)
OS_CHECK_DEPS=(grep bind-utils)
LIGHTTPD_USER="lighttpd"
LIGHTTPD_GROUP="lighttpd"
LIGHTTPD_CFG="lighttpd.conf.fedora"
if [ "${PKG_MANAGER}" = "dnf" ] || [ "${PKG_MANAGER}" = "yum" ] ; then
# CentOS package manager returns 100 when there are packages to update so we need to || true to prevent the script from exiting.
PKG_COUNT="${PKG_MANAGER} check-update | egrep '(.i686|.x86|.noarch|.arm|.src)' | wc -l || true"
INSTALLER_DEPS=(git dialog iproute newt procps-ng which chkconfig ca-certificates)
PIHOLE_DEPS=(cronie curl findutils sudo unzip libidn2 psmisc libcap nmap-ncat jq)
PIHOLE_WEB_DEPS=(lighttpd lighttpd-fastcgi php-common php-cli php-pdo php-xml php-json php-intl)
# If the host OS is centos (or a derivative), epel is required for lighttpd
if ! grep -qiE 'fedora|fedberry' /etc/redhat-release; then
if rpm -qa | grep -qi 'epel'; then
printf " %b EPEL repository already installed\\n" "${TICK}"
else
local RH_RELEASE EPEL_PKG
# EPEL not already installed, add it based on the release version
RH_RELEASE=$(grep -oP '(?<= )[0-9]+(?=\.?)' /etc/redhat-release)
EPEL_PKG="https://dl.fedoraproject.org/pub/epel/epel-release-latest-${RH_RELEASE}.noarch.rpm"
printf " %b Enabling EPEL package repository (https://fedoraproject.org/wiki/EPEL)\\n" "${INFO}"
"${PKG_INSTALL[@]}" "${EPEL_PKG}"
printf " %b Installed %s\\n" "${TICK}" "${EPEL_PKG}"
fi
fi
else
# openSUSE packages
# openSUSE package manager returns number when there are packages to update so we need to || true to prevent the script from exiting.
PKG_COUNT="${PKG_MANAGER} lu | egrep '(.i686|.x86|.noarch|.arm|.src)' | wc -l || true"
INSTALLER_DEPS=(git dialog iproute newt procps which ca-certificates)
PIHOLE_DEPS=(cronie curl findutils sudo unzip libidn2 psmisc libcap-ng0 nmap ncat jq)
PIHOLE_WEB_DEPS=(lighttpd php8 php8-fastcgi php8-cli php8-pdo php8-intl php8-openssl php8-sqlite)
fi
else
# If neither apt-get or yum/dnf package managers were found
# we cannot install required packages
printf " %b No supported package manager found\\n" "${CROSS}"
# so exit the installer
exit
fi
}
# A function for checking if a directory is a git repository
is_repo() {
# Use a named, local variable instead of the vague $1, which is the first argument passed to this function
# These local variables should always be lowercase
local directory="${1}"
# A variable to store the return code
local rc
# If the first argument passed to this function is a directory,
if [[ -d "${directory}" ]]; then
# move into the directory
pushd "${directory}" &> /dev/null || return 1
# Use git to check if the directory is a repo
# git -C is not used here to support git versions older than 1.8.4
git status --short &> /dev/null || rc=$?
# If the command was not successful,
else
# Set a non-zero return code if directory does not exist
rc=1
fi
# Move back into the directory the user started in
popd &> /dev/null || return 1
# Return the code; if one is not set, return 0
return "${rc:-0}"
}
# A function to clone a repo
make_repo() {
# Set named variables for better readability
local directory="${1}"
local remoteRepo="${2}"
# The message to display when this function is running
str="Clone ${remoteRepo} into ${directory}"
# Display the message and use the color table to preface the message with an "info" indicator
printf " %b %s..." "${INFO}" "${str}"
# If the directory exists,
if [[ -d "${directory}" ]]; then
# Return with a 1 to exit the installer. We don't want to overwrite what could already be here in case it is not ours
str="Unable to clone ${remoteRepo} into ${directory} : Directory already exists"
printf "%b %b%s\\n" "${OVER}" "${CROSS}" "${str}"
return 1
fi
# Clone the repo and return the return code from this command
git clone -q --depth 20 "${remoteRepo}" "${directory}" &> /dev/null || return $?
# Move into the directory that was passed as an argument
pushd "${directory}" &> /dev/null || return 1
# Check current branch. If it is master, then reset to the latest available tag.
# In case extra commits have been added after tagging/release (i.e in case of metadata updates/README.MD tweaks)
curBranch=$(git rev-parse --abbrev-ref HEAD)
if [[ "${curBranch}" == "master" ]]; then
# If we're calling make_repo() then it should always be master, we may not need to check.
git reset --hard "$(git describe --abbrev=0 --tags)" || return $?
fi
# Show a colored message showing it's status
printf "%b %b %s\\n" "${OVER}" "${TICK}" "${str}"
# Data in the repositories is public anyway so we can make it readable by everyone (+r to keep executable permission if already set by git)
chmod -R a+rX "${directory}"
# Move back into the original directory
popd &> /dev/null || return 1
return 0
}
# We need to make sure the repos are up-to-date so we can effectively install Clean out the directory if it exists for git to clone into
update_repo() {
# Use named, local variables
# As you can see, these are the same variable names used in the last function,
# but since they are local, their scope does not go beyond this function
# This helps prevent the wrong value from being assigned if you were to set the variable as a GLOBAL one
local directory="${1}"
local curBranch
# A variable to store the message we want to display;
# Again, it's useful to store these in variables in case we need to reuse or change the message;
# we only need to make one change here
local str="Update repo in ${1}"
# Move into the directory that was passed as an argument
pushd "${directory}" &> /dev/null || return 1
# Let the user know what's happening
printf " %b %s..." "${INFO}" "${str}"
# Stash any local commits as they conflict with our working code
git stash --all --quiet &> /dev/null || true # Okay for stash failure
git clean --quiet --force -d || true # Okay for already clean directory
# Pull the latest commits
git pull --no-rebase --quiet &> /dev/null || return $?
# Check current branch. If it is master, then reset to the latest available tag.
# In case extra commits have been added after tagging/release (i.e in case of metadata updates/README.MD tweaks)
curBranch=$(git rev-parse --abbrev-ref HEAD)
if [[ "${curBranch}" == "master" ]]; then
git reset --hard "$(git describe --abbrev=0 --tags)" || return $?
fi
# Show a completion message
printf "%b %b %s\\n" "${OVER}" "${TICK}" "${str}"
# Data in the repositories is public anyway so we can make it readable by everyone (+r to keep executable permission if already set by git)
chmod -R a+rX "${directory}"
# Move back into the original directory
popd &> /dev/null || return 1
return 0
}
# A function that combines the previous git functions to update or clone a repo
getGitFiles() {
# Setup named variables for the git repos
# We need the directory
local directory="${1}"
# as well as the repo URL
local remoteRepo="${2}"
# A local variable containing the message to be displayed
local str="Check for existing repository in ${1}"
# Show the message
printf " %b %s..." "${INFO}" "${str}"
# Check if the directory is a repository
if is_repo "${directory}"; then
# Show that we're checking it
printf "%b %b %s\\n" "${OVER}" "${TICK}" "${str}"
# Update the repo, returning an error message on failure
update_repo "${directory}" || { printf "\\n %b: Could not update local repository. Contact support.%b\\n" "${COL_LIGHT_RED}" "${COL_NC}"; exit 1; }
# If it's not a .git repo,
else
# Show an error
printf "%b %b %s\\n" "${OVER}" "${CROSS}" "${str}"
# Attempt to make the repository, showing an error on failure
make_repo "${directory}" "${remoteRepo}" || { printf "\\n %bError: Could not update local repository. Contact support.%b\\n" "${COL_LIGHT_RED}" "${COL_NC}"; exit 1; }
fi
echo ""
# Success via one of the two branches, as the commands would exit if they failed.
return 0
}
# Reset a repo to get rid of any local changed
resetRepo() {
# Use named variables for arguments
local directory="${1}"
# Move into the directory
pushd "${directory}" &> /dev/null || return 1
# Store the message in a variable
str="Resetting repository within ${1}..."
# Show the message
printf " %b %s..." "${INFO}" "${str}"
# Use git to remove the local changes
git reset --hard &> /dev/null || return $?
# Data in the repositories is public anyway so we can make it readable by everyone (+r to keep executable permission if already set by git)
chmod -R a+rX "${directory}"
# And show the status
printf "%b %b %s\\n" "${OVER}" "${TICK}" "${str}"
# Return to where we came from
popd &> /dev/null || return 1
# Function succeeded, as "git reset" would have triggered a return earlier if it failed
return 0
}
find_IPv4_information() {
# Detects IPv4 address used for communication to WAN addresses.
# Accepts no arguments, returns no values.
# Named, local variables
local route
local IPv4bare
# Find IP used to route to outside world by checking the the route to Google's public DNS server
route=$(ip route get 8.8.8.8)
# Get just the interface IPv4 address
# shellcheck disable=SC2059,SC2086
# disabled as we intentionally want to split on whitespace and have printf populate
# the variable with just the first field.
printf -v IPv4bare "$(printf ${route#*src })"
# Get the default gateway IPv4 address (the way to reach the Internet)
# shellcheck disable=SC2059,SC2086
printf -v IPv4gw "$(printf ${route#*via })"
if ! valid_ip "${IPv4bare}" ; then
IPv4bare="127.0.0.1"
fi
# Append the CIDR notation to the IP address, if valid_ip fails this should return 127.0.0.1/8
IPV4_ADDRESS=$(ip -oneline -family inet address show | grep "${IPv4bare}/" | awk '{print $4}' | awk 'END {print}')
}
# Get available interfaces that are UP
get_available_interfaces() {
# There may be more than one so it's all stored in a variable
availableInterfaces=$(ip --oneline link show up | grep -v "lo" | awk '{print $2}' | cut -d':' -f1 | cut -d'@' -f1)
}
# A function for displaying the dialogs the user sees when first running the installer
welcomeDialogs() {
# Display the welcome dialog using an appropriately sized window via the calculation conducted earlier in the script
dialog --no-shadow --clear --keep-tite \
--backtitle "Welcome" \
--title "Pi-hole Automated Installer" \
--msgbox "\\n\\nThis installer will transform your device into a network-wide ad blocker!" \
"${r}" "${c}" \
--and-widget --clear \
--backtitle "Support Pi-hole" \
--title "Open Source Software" \
--msgbox "\\n\\nThe Pi-hole is free, but powered by your donations: https://pi-hole.net/donate/" \
"${r}" "${c}" \
--and-widget --clear \
--colors \
--backtitle "Initiating network interface" \
--title "Static IP Needed" \
--no-button "Exit" --yes-button "Continue" \
--defaultno \
--yesno "\\n\\nThe Pi-hole is a SERVER so it needs a STATIC IP ADDRESS to function properly.\\n\\n\
\\Zb\\Z1IMPORTANT:\\Zn If you have not already done so, you must ensure that this device has a static IP.\\n\\n\
Depending on your operating system, there are many ways to achieve this, through DHCP reservation, or by manually assigning one.\\n\\n\
Please continue when the static addressing has been configured."\
"${r}" "${c}" && result=0 || result="$?"
case "${result}" in
"${DIALOG_CANCEL}" | "${DIALOG_ESC}")
printf " %b Installer exited at static IP message.\\n" "${INFO}"
exit 1
;;
esac
}
# A function that lets the user pick an interface to use with Pi-hole
chooseInterface() {
# Turn the available interfaces into a string so it can be used with dialog
local interfacesList
# Number of available interfaces
local interfaceCount
# POSIX compliant way to get the number of elements in an array
interfaceCount=$(printf "%s\n" "${availableInterfaces}" | wc -l)
# If there is one interface,
if [[ "${interfaceCount}" -eq 1 ]]; then
# Set it as the interface to use since there is no other option
PIHOLE_INTERFACE="${availableInterfaces}"
# Otherwise,
else
# Set status for the first entry to be selected
status="ON"
# While reading through the available interfaces
for interface in ${availableInterfaces}; do
# Put all these interfaces into a string
interfacesList="${interfacesList}${interface} available ${status} "
# All further interfaces are deselected
status="OFF"
done
# shellcheck disable=SC2086
# Disable check for double quote here as we are passing a string with spaces
PIHOLE_INTERFACE=$(dialog --no-shadow --keep-tite --output-fd 1 \
--cancel-label "Exit" --ok-label "Select" \
--radiolist "Choose An Interface (press space to toggle selection)" \
${r} ${c} "${interfaceCount}" ${interfacesList})
result=$?
case ${result} in
"${DIALOG_CANCEL}"|"${DIALOG_ESC}")
# Show an error message and exit
printf " %b %s\\n" "${CROSS}" "No interface selected, exiting installer"
exit 1
;;
esac
printf " %b Using interface: %s\\n" "${INFO}" "${PIHOLE_INTERFACE}"
fi
}
# This lets us prefer ULA addresses over GUA
# This caused problems for some users when their ISP changed their IPv6 addresses
# See https://github.com/pi-hole/pi-hole/issues/1473#issuecomment-301745953
testIPv6() {
# first will contain fda2 (ULA)
printf -v first "%s" "${1%%:*}"
# value1 will contain 253 which is the decimal value corresponding to 0xFD
value1=$(( (0x$first)/256 ))
# value2 will contain 162 which is the decimal value corresponding to 0xA2
value2=$(( (0x$first)%256 ))
# the ULA test is testing for fc00::/7 according to RFC 4193
if (( (value1&254)==252 )); then
# echoing result to calling function as return value
echo "ULA"
fi
# the GUA test is testing for 2000::/3 according to RFC 4291
if (( (value1&112)==32 )); then
# echoing result to calling function as return value
echo "GUA"
fi
# the LL test is testing for fe80::/10 according to RFC 4193
if (( (value1)==254 )) && (( (value2&192)==128 )); then
# echoing result to calling function as return value
echo "Link-local"
fi
}
find_IPv6_information() {
# Detects IPv6 address used for communication to WAN addresses.
mapfile -t IPV6_ADDRESSES <<<"$(ip -6 address | grep 'scope global' | awk '{print $2}')"
# For each address in the array above, determine the type of IPv6 address it is
for i in "${IPV6_ADDRESSES[@]}"; do
# Check if it's ULA, GUA, or LL by using the function created earlier
result=$(testIPv6 "$i")
# If it's a ULA address, use it and store it as a global variable
[[ "${result}" == "ULA" ]] && ULA_ADDRESS="${i%/*}"
# If it's a GUA address, use it and store it as a global variable
[[ "${result}" == "GUA" ]] && GUA_ADDRESS="${i%/*}"
# Else if it's a Link-local address, we cannot use it, so just continue
done
# Determine which address to be used: Prefer ULA over GUA or don't use any if none found
# If the ULA_ADDRESS contains a value,
if [[ -n "${ULA_ADDRESS}" ]]; then
# set the IPv6 address to the ULA address
IPV6_ADDRESS="${ULA_ADDRESS}"
# Show this info to the user
printf " %b Found IPv6 ULA address\\n" "${INFO}"
# Otherwise, if the GUA_ADDRESS has a value,
elif [[ -n "${GUA_ADDRESS}" ]]; then
# Let the user know
printf " %b Found IPv6 GUA address\\n" "${INFO}"
# And assign it to the global variable
IPV6_ADDRESS="${GUA_ADDRESS}"
# If none of those work,
else
printf " %b Unable to find IPv6 ULA/GUA address\\n" "${INFO}"
# So set the variable to be empty
IPV6_ADDRESS=""
fi
}
# A function to collect IPv4 and IPv6 information of the device
collect_v4andv6_information() {
find_IPv4_information
# Echo the information to the user
printf " %b IPv4 address: %s\\n" "${INFO}" "${IPV4_ADDRESS}"
# if `dhcpcd` is used offer to set this as static IP for the device
if [[ -f "/etc/dhcpcd.conf" ]]; then
# configure networking via dhcpcd
getStaticIPv4Settings
fi
find_IPv6_information
printf " %b IPv6 address: %s\\n" "${INFO}" "${IPV6_ADDRESS}"
}
getStaticIPv4Settings() {
# Local, named variables
local ipSettingsCorrect
local DHCPChoice
# Ask if the user wants to use DHCP settings as their static IP
# This is useful for users that are using DHCP reservations; we can use the information gathered
DHCPChoice=$(dialog --no-shadow --keep-tite --output-fd 1 \
--cancel-label "Exit" --ok-label "Continue" \
--backtitle "Calibrating network interface" \
--title "Static IP Address" \
--menu "Do you want to use your current network settings as a static address?\\n \
IP address: ${IPV4_ADDRESS}\\n \
Gateway: ${IPv4gw}\\n" \
"${r}" "${c}" 3 \
"Yes" "Set static IP using current values" \
"No" "Set static IP using custom values" \
"Skip" "I will set a static IP later, or have already done so")
result=$?
case ${result} in
"${DIALOG_CANCEL}" | "${DIALOG_ESC}")
printf " %b Cancel was selected, exiting installer%b\\n" "${COL_LIGHT_RED}" "${COL_NC}"
exit 1
;;
esac
case ${DHCPChoice} in
"Skip")
return
;;
"Yes")
# If they choose yes, let the user know that the IP address will not be available via DHCP and may cause a conflict.
dialog --no-shadow --keep-tite \
--cancel-label "Exit" \
--backtitle "IP information" \
--title "FYI: IP Conflict" \
--msgbox "\\nIt is possible your router could still try to assign this IP to a device, which would cause a conflict, \
but in most cases the router is smart enough to not do that.\n\n\
If you are worried, either manually set the address, or modify the DHCP reservation pool so it does not include the IP you want.\n\n\
It is also possible to use a DHCP reservation, but if you are going to do that, you might as well set a static address."\
"${r}" "${c}" && result=0 || result=$?
case ${result} in
"${DIALOG_CANCEL}" | "${DIALOG_ESC}")
printf " %b Cancel was selected, exiting installer%b\\n" "${COL_LIGHT_RED}" "${COL_NC}"
exit 1
;;
esac
;;
"No")
# Otherwise, we need to ask the user to input their desired settings.
# Start by getting the IPv4 address (pre-filling it with info gathered from DHCP)
# Start a loop to let the user enter their information with the chance to go back and edit it if necessary
ipSettingsCorrect=false
until [[ "${ipSettingsCorrect}" = True ]]; do
# Ask for the IPv4 address
_staticIPv4Temp=$(dialog --no-shadow --keep-tite --output-fd 1 \
--cancel-label "Exit" \
--ok-label "Continue" \
--backtitle "Calibrating network interface" \
--title "IPv4 Address" \
--form "\\nEnter your desired IPv4 address" \
"${r}" "${c}" 0 \
"IPv4 Address:" 1 1 "${IPV4_ADDRESS}" 1 15 19 0 \
"IPv4 Gateway:" 2 1 "${IPv4gw}" 2 15 19 0)
result=$?
case ${result} in
"${DIALOG_CANCEL}" | "${DIALOG_ESC}")
printf " %b Cancel was selected, exiting installer%b\\n" "${COL_LIGHT_RED}" "${COL_NC}"
exit 1
;;
esac
IPV4_ADDRESS=${_staticIPv4Temp%$'\n'*}
IPv4gw=${_staticIPv4Temp#*$'\n'}
# Give the user a chance to review their settings before moving on
dialog --no-shadow --keep-tite \
--no-label "Edit IP" \
--backtitle "Calibrating network interface" \
--title "Static IP Address" \
--defaultno \
--yesno "Are these settings correct?
IP address: ${IPV4_ADDRESS}
Gateway: ${IPv4gw}" \
"${r}" "${c}" && ipSettingsCorrect=True
done
;;
esac
setDHCPCD
}
# Configure networking via dhcpcd
setDHCPCD() {
# Regex for matching a non-commented static ip address setting
local regex="^[ \t]*static ip_address[ \t]*=[ \t]*${IPV4_ADDRESS}"
# Check if static IP is already set in file
if grep -q "${regex}" /etc/dhcpcd.conf; then
printf " %b Static IP already configured\\n" "${INFO}"
# If it's not,
else
# we can append these lines to dhcpcd.conf to enable a static IP
echo "interface ${PIHOLE_INTERFACE}
static ip_address=${IPV4_ADDRESS}
static routers=${IPv4gw}
static domain_name_servers=${PIHOLE_DNS_1} ${PIHOLE_DNS_2}" | tee -a /etc/dhcpcd.conf >/dev/null
# Then use the ip command to immediately set the new address
ip addr replace dev "${PIHOLE_INTERFACE}" "${IPV4_ADDRESS}"
# Also give a warning that the user may need to reboot their system
printf " %b Set IP address to %s\\n" "${TICK}" "${IPV4_ADDRESS%/*}"
printf " %b You may need to restart after the install is complete\\n" "${INFO}"
fi
}
# Check an IP address to see if it is a valid one
valid_ip() {
# Local, named variables
local ip=${1}
local stat=1
# Regex matching one IPv4 component, i.e. an integer from 0 to 255.
# See https://tools.ietf.org/html/rfc1340
local ipv4elem="(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]?|0)";
# Regex matching an optional port (starting with '#') range of 1-65536
local portelem="(#(6553[0-5]|655[0-2][0-9]|65[0-4][0-9]{2}|6[0-4][0-9]{3}|[1-5][0-9]{4}|[1-9][0-9]{0,3}|0))?";
# Build a full IPv4 regex from the above subexpressions
local regex="^${ipv4elem}\\.${ipv4elem}\\.${ipv4elem}\\.${ipv4elem}${portelem}$"
# Evaluate the regex, and return the result
[[ $ip =~ ${regex} ]]
stat=$?
return "${stat}"
}
valid_ip6() {
local ip=${1}
local stat=1
# Regex matching one IPv6 element, i.e. a hex value from 0000 to FFFF
local ipv6elem="[0-9a-fA-F]{1,4}"
# Regex matching an IPv6 CIDR, i.e. 1 to 128
local v6cidr="(\\/([1-9]|[1-9][0-9]|1[0-1][0-9]|12[0-8])){0,1}"
# Regex matching an optional port (starting with '#') range of 1-65536
local portelem="(#(6553[0-5]|655[0-2][0-9]|65[0-4][0-9]{2}|6[0-4][0-9]{3}|[1-5][0-9]{4}|[1-9][0-9]{0,3}|0))?";
# Build a full IPv6 regex from the above subexpressions
local regex="^(((${ipv6elem}))*((:${ipv6elem}))*::((${ipv6elem}))*((:${ipv6elem}))*|((${ipv6elem}))((:${ipv6elem})){7})${v6cidr}${portelem}$"
# Evaluate the regex, and return the result
[[ ${ip} =~ ${regex} ]]
stat=$?
return "${stat}"
}
# A function to choose the upstream DNS provider(s)
setDNS() {
# Local, named variables
local DNSSettingsCorrect
# In an array, list the available upstream providers
DNSChooseOptions=()
local DNSServerCount=0
# Save the old Internal Field Separator in a variable,
OIFS=$IFS
# and set the new one to newline
IFS=$'\n'
# Put the DNS Servers into an array
for DNSServer in ${DNS_SERVERS}
do
DNSName="$(cut -d';' -f1 <<< "${DNSServer}")"
DNSChooseOptions[DNSServerCount]="${DNSName}"
(( DNSServerCount=DNSServerCount+1 ))
DNSChooseOptions[DNSServerCount]=""
(( DNSServerCount=DNSServerCount+1 ))
done
DNSChooseOptions[DNSServerCount]="Custom"
(( DNSServerCount=DNSServerCount+1 ))
DNSChooseOptions[DNSServerCount]=""
# Restore the IFS to what it was
IFS=${OIFS}
# In a dialog, show the options
DNSchoices=$(dialog --no-shadow --keep-tite --output-fd 1 \
--cancel-label "Exit" \
--menu "Select Upstream DNS Provider. To use your own, select Custom." "${r}" "${c}" 7 \
"${DNSChooseOptions[@]}")
result=$?
case ${result} in
"${DIALOG_CANCEL}" | "${DIALOG_ESC}")
printf " %b Cancel was selected, exiting installer%b\\n" "${COL_LIGHT_RED}" "${COL_NC}"
exit 1
;;
esac
# Depending on the user's choice, set the GLOBAL variables to the IP of the respective provider
if [[ "${DNSchoices}" == "Custom" ]]
then
# Loop until we have a valid DNS setting
until [[ "${DNSSettingsCorrect}" = True ]]; do
# Signal value, to be used if the user inputs an invalid IP address
strInvalid="Invalid"
if [[ ! "${PIHOLE_DNS_1}" ]]; then
if [[ ! "${PIHOLE_DNS_2}" ]]; then
# If the first and second upstream servers do not exist, do not prepopulate an IP address
prePopulate=""
else
# Otherwise, prepopulate the dialogue with the appropriate DNS value(s)
prePopulate=", ${PIHOLE_DNS_2}"
fi
elif [[ "${PIHOLE_DNS_1}" ]] && [[ ! "${PIHOLE_DNS_2}" ]]; then
prePopulate="${PIHOLE_DNS_1}"
elif [[ "${PIHOLE_DNS_1}" ]] && [[ "${PIHOLE_DNS_2}" ]]; then
prePopulate="${PIHOLE_DNS_1}, ${PIHOLE_DNS_2}"
fi
# Prompt the user to enter custom upstream servers
piholeDNS=$(dialog --no-shadow --keep-tite --output-fd 1 \
--cancel-label "Exit" \
--backtitle "Specify Upstream DNS Provider(s)" \
--inputbox "Enter your desired upstream DNS provider(s), separated by a comma.\
If you want to specify a port other than 53, separate it with a hash.\
\\n\\nFor example '8.8.8.8, 8.8.4.4' or '127.0.0.1#5335'"\
"${r}" "${c}" "${prePopulate}")
result=$?
case ${result} in
"${DIALOG_CANCEL}" | "${DIALOG_ESC}")
printf " %b Cancel was selected, exiting installer%b\\n" "${COL_LIGHT_RED}" "${COL_NC}"
exit 1
;;
esac
# Clean user input and replace whitespace with comma.
piholeDNS=$(sed 's/[, \t]\+/,/g' <<< "${piholeDNS}")
# Separate the user input into the two DNS values (separated by a comma)
printf -v PIHOLE_DNS_1 "%s" "${piholeDNS%%,*}"
printf -v PIHOLE_DNS_2 "%s" "${piholeDNS##*,}"
# If the first DNS value is invalid or empty, this if statement will be true and we will set PIHOLE_DNS_1="Invalid"
if ! valid_ip "${PIHOLE_DNS_1}" || [[ ! "${PIHOLE_DNS_1}" ]]; then
PIHOLE_DNS_1=${strInvalid}
fi
# If the second DNS value is invalid or empty, this if statement will be true and we will set PIHOLE_DNS_2="Invalid"
if ! valid_ip "${PIHOLE_DNS_2}" && [[ "${PIHOLE_DNS_2}" ]]; then
PIHOLE_DNS_2=${strInvalid}
fi
# If either of the DNS servers are invalid,
if [[ "${PIHOLE_DNS_1}" == "${strInvalid}" ]] || [[ "${PIHOLE_DNS_2}" == "${strInvalid}" ]]; then
# explain this to the user,
dialog --no-shadow --keep-tite \