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urlmonitor - print out the URLs requested system wide on the main network interface

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# urlmonitor - print out the URLs requested system wide on the main network interface
 
# Accept a network interface name as an optional argument
iface = ARGV.first
 
# No interface specified? Try to guess which one is king..
unless iface
`ifconfig -l`.split.each do |iface|
next if iface =~ /^lo/
break if `ifconfig #{iface}` =~ /inet (0|1|2)/
end
end
 
# Get tcpdump running, grep out relevant HTTP headers and build them
# in to URLs
STDOUT.sync = true
IO.popen(%{sudo tcpdump -i en1 -n -s 0 -w - | grep -a --line-buffered -E "Host\: .*|GET \/.*"}, 'r') do |pipe|
pipe.sync = true
while line = pipe.gets
path = $1.chomp and host = nil if line =~ /GET (.*?)\s/
host = $1.chomp if line =~ /Host: (.*)/
if path && host
puts "http://#{host}#{path}"
path = host = nil
end
end
end
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