Map ads to 127.0.0.1

Apply-HostsAdBlock.ps1

Set-Variable -Name hosts -Value C:\Windows\System32\drivers\etc\hosts
Set-Variable -Name oldHosts -Value C:\Windows\System32\drivers\etc\hosts.old.apply_hostsadblock
$sources = "https://adaway.org/hosts.txt",
			"https://hosts-file.net/ad_servers.txt",
			"https://pgl.yoyo.org/adservers/serverlist.php?hostformat=hosts&showintro=0&mimetype=plaintext"
			

echo " *** WARNING *** "
echo " ! This script can be executed to update the hosts file !"
echo " ! For that reason, this WILL OVERWRITE THE hosts file  !"
echo " ! localhost mapping restored at the end                !"

if(Test-Path $oldHosts) {
	echo " ==> A copy of old hosts already exists, would you like to make a copy, or let it get overwritten?"
	$answ = Read-Host -Prompt " Answer[ow/mkc]"
	if($answ -eq "ow") {
		echo " warn: overwriting copy file!"
	} elseIf($answ -eq "mkc") {
		echo " info: making copy of backup file"
		echo " info: right here"
		Copy $oldHosts old_hosts_copy
		if(-not $?) {
			echo " error: cannot copy file, aborting..."
			exit 1
		}
	} else {
		echo " error: non-valid answer, aborting..."
		exit 1
	}
}

echo " * Copying old hosts file..."
echo " * Copy location: $oldHosts"

Copy $hosts $oldHosts 
if(-not $?) {
	exit 1
}

Set-Variable -Name i -Value 0
foreach($source in $sources) {
	echo " --> Downloading from: $source"
	Invoke-WebRequest -Uri $source -OutFile "tmpHosts__$i" -UseBasicParsing >$null 2>&1
	if(-not $?) {
		echo "--! Cannot download from $source, ignoring"
		continue
	}
	$i++
}

echo " -- Applying changes to $hosts..."
Get-Content tmpHosts__* | Set-Content $hosts

if(-not $?) {
	echo " --! Something went wrong!"
	exit 2
}

Del tmpHosts__* 

if(-not $?) {
	echo "--! Something went wrong!"
	exit 3
}