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Tuesday, 23 November 2010 11:12 |
Very simple netstat alike script for TCP only written in Ruby ...
!#/usr/bin/env ruby
PROC_NET_TCP = '/proc/net/tcp' # This should always be the same ...
TCP_STATES = {
'00' => 'UNKNOWN', # Bad state ... Impossible to achieve ...
'FF' => 'UNKNOWN', # Bad state ... Impossible to achieve ...
'01' => 'ESTABLISHED',
'02' => 'SYN_SENT',
'03' => 'SYN_RECV',
'04' => 'FIN_WAIT1',
'05' => 'FIN_WAIT2',
'06' => 'TIME_WAIT',
'07' => 'CLOSE',
'08' => 'CLOSE_WAIT',
'09' => 'LAST_ACK',
'0A' => 'LISTEN',
'0B' => 'CLOSING'
}
SINGLE_ENTRY_PATTERN = Regexp.new(
/^\s*\d+:\s+(.{8}):(.{4})\s+(.{8}):(.{4})\s+(.{2})/
)
File.open(PROC_NET_TCP).each do |i|
i = i.strip
if match = i.match(SINGLE_ENTRY_PATTERN)
local_IP = match[1].to_i(16)
local_IP = [local_IP].pack("N").unpack("C4").reverse.join('.')
local_port = match[2].to_i(16)
remote_IP = match[3].to_i(16)
remote_IP = [remote_IP].pack("N").unpack("C4").reverse.join('.')
remote_port = match[4].to_i(16)
connection_state = match[5]
connection_state = TCP_STATES[connection_state]
puts "#{local_IP}:#{local_port} " +
"#{remote_IP}:#{remote_port} #{connection_state}"
end
end
exit(0)
Simple use-case:
krzysztof@desktop:~$ ./netstat.rb | grep LISTEN | sort
0.0.0.0:17500 0.0.0.0:0 LISTEN
0.0.0.0:2049 0.0.0.0:0 LISTEN
0.0.0.0:21 0.0.0.0:0 LISTEN
0.0.0.0:22 0.0.0.0:0 LISTEN
0.0.0.0:39080 0.0.0.0:0 LISTEN
0.0.0.0:44274 0.0.0.0:0 LISTEN
127.0.0.1:25 0.0.0.0:0 LISTEN
127.0.0.1:4096 0.0.0.0:0 LISTEN
127.0.0.1:4097 0.0.0.0:0 LISTEN
127.0.0.1:631 0.0.0.0:0 LISTEN
127.0.0.1:7634 0.0.0.0:0 LISTEN
127.0.0.1:8192 0.0.0.0:0 LISTEN
You may re-use this code to do something else ... i.e. write Puppet fact or something ... Read more: |
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Tuesday, 22 December 2009 08:46 |
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How To Build A Low Cost SAN
In today's world there is a obvious need of information sharing in
every department and network storage can help us to achieve this most
growing challenge.
Here in this article we are focusing our concentration to make a low-cost SAN. Read more: |
