Block known dirty hosts from reaching your machine
wget -qO - http://infiltrated.net/blacklisted|awk '!/#|[a-z]/&&/./{print "iptables -A INPUT -s "$1" -j DROP"}'|head -n 2
iptables -A INPUT -s 99.245.29.38 -j DROP
iptables -A INPUT -s 97.81.54.226 -j DROP
To have them automatically blocked:
wget -qO - http://infiltrated.net/blacklisted|awk '!/#|[a-z]/&&/./{print "iptables -A INPUT -s "$1" -j DROP"}'|sh
What do you think?
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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more test99.69.161.123 99.69.161.123 99.69.161.123 99.68.231.37 99.58.203.81 99.4.136.182 99.38.203.228 99.36.16.156 99.31.123.191 99.27.202.67 Let's number them:sed '/./=' test | sed '/./N; s/\n/ /'1 99.69.161.123 2 99.69.161.123 3 99.69.161.123 4 99.68.231.37 5 99.58.203.81 6 99.4.136.182 7 99.38.203.228 8 99.36.16.156 9 99.31.123.191 10 99.27.202.67 So we see lines 1, 2, 3 are the same... There are a few ways to sort them uniquely. Since I began using awk, here is how to do so with awk:awk '!/#|[a-z]/&&/./{print "iptables -A INPUT -s "$1" -j DROP" | "sort -u"}' testNotice how I use the sort command inside awk? There is no reason to re-pipe it through to sort: awk by itselfawk '!/#|[a-z]/&&/./{print "iptables -A INPUT -s "$1" -j DROP"}' testiptables -A INPUT -s 99.69.161.123 -j DROP iptables -A INPUT -s 99.69.161.123 -j DROP iptables -A INPUT -s 99.69.161.123 -j DROP iptables -A INPUT -s 99.68.231.37 -j DROP iptables -A INPUT -s 99.58.203.81 -j DROP iptables -A INPUT -s 99.4.136.182 -j DROP iptables -A INPUT -s 99.38.203.228 -j DROP iptables -A INPUT -s 99.36.16.156 -j DROP iptables -A INPUT -s 99.31.123.191 -j DROP iptables -A INPUT -s 99.27.202.67 -j DROP awk with sort -u (-u is for unique instead of: more filename | sort | uniq)awk '!/#|[a-z]/&&/./{print "iptables -A INPUT -s "$1" -j DROP"}' test | sort -uiptables -A INPUT -s 99.27.202.67 -j DROP iptables -A INPUT -s 99.31.123.191 -j DROP iptables -A INPUT -s 99.36.16.156 -j DROP iptables -A INPUT -s 99.38.203.228 -j DROP iptables -A INPUT -s 99.4.136.182 -j DROP iptables -A INPUT -s 99.58.203.81 -j DROP iptables -A INPUT -s 99.68.231.37 -j DROP iptables -A INPUT -s 99.69.161.123 -j DROP Why bother going through this when I can just use sort inside of awk. The uglier and bloated way would be something like: awk '!/#|[a-z]/&&/./{print "iptables -A INPUT -s "$1" -j DROP"}' filename | sort | uniq Or even uglier: curl www.infiltrated.net/blacklisted | ruby -ne 'puts $_ unless $_ == @prev; @prev = $_' | awk '{print "iptables -A INPUT -s "$1" -j DROP"}'awk '!/#|[a-z]/&&/./{print "iptables -A INPUT -s "$1" -j DROP" | "sort -u"}'