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A quick shell script that will automatically update a Linux HOSTS file to block domains (ads, malwares, ...). Support multiple hosts sources, initial host file and incorrect/malicious entries checking.
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| #!/bin/bash | |
| # Filename: update-hosts.sh | |
| # | |
| # Author: George Lesica <george@lesica.com> | |
| # Enhanced by Eliastik ( eliastiksofts.com/contact ) | |
| # | |
| # Description: Replaces the HOSTS file with hosts lists from Internet, | |
| # creating a backup of the old file. Can be used as an update script. | |
| # | |
| # Enhancement by Eliastik : | |
| # Added the possibility to download multiple hosts files from multiple sources, | |
| # added the possibility to use an initial host file to be appended at the top | |
| # of the system host file, others fixes. | |
| # | |
| # Can be used as a cron script. | |
| # Configuration variables: | |
| # Add an host source by adding a space after the last entry of the variable HOSTS_URLS (before the ")"), then by adding your URL with quotes (ex: "http://www.example.com/hosts.txt") | |
| HOSTS_URLS=( "http://someonewhocares.org/hosts/zero/hosts/" "https://pgl.yoyo.org/adservers/serverlist.php?showintro=0&mimetype=plaintext&useip=0.0.0.0" "http://winhelp2002.mvps.org/hosts.txt" ) | |
| INITIAL_HOSTS="/etc/hosts.initial" | |
| NEW_HOSTS="hosts" | |
| HOSTS_PATH="/etc/hosts" | |
| # Check for root | |
| if [ "$(id -u)" -ne "0" ]; then | |
| echo "This script must be run as root" 1>&2 | |
| exit 1 | |
| fi | |
| # Check curl | |
| if ! [ -x "$(command -v curl)" ]; then | |
| echo 'Error: curl is not installed. Please install it to run this script.' >&2 | |
| exit 1 | |
| fi | |
| # create temporary directory | |
| echo "Creating temporary directory..." | |
| cd $(mktemp -d) | |
| echo "Created temporary directory at $(pwd)" | |
| # create new temp hosts | |
| if [ -f "$INITIAL_HOSTS" ] | |
| then | |
| cat $INITIAL_HOSTS>$NEW_HOSTS | |
| else | |
| echo "The initial host file doesn't exist: $INITIAL_HOSTS" | |
| echo "">$NEW_HOSTS | |
| fi | |
| # Grab hosts file | |
| for i in "${HOSTS_URLS[@]}" | |
| do | |
| : | |
| nberror=0 | |
| echo "Downloading hosts list from: $i" | |
| while true; do | |
| curl -s --fail "$i">>$NEW_HOSTS && break || | |
| nberror=$((nberror + 1)) | |
| echo "Download failed ! Retrying..." | |
| if [ $nberror -ge 5 ]; then | |
| echo "Download failed 5 times. Check your Internet connection and the host source then try again. Continue..." | |
| break | |
| fi | |
| done | |
| done | |
| # Backup old hosts file | |
| echo "Backup old hosts file..." | |
| cp -v $HOSTS_PATH ${HOSTS_PATH}.bak | |
| echo "Installing hosts list..." | |
| cp -v $NEW_HOSTS $HOSTS_PATH | |
| # Clean up old downloads | |
| echo "Removing cache..." | |
| rm $NEW_HOSTS* | |
| echo "Done !" |
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