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telnet script

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# 1  
Old 09-29-2011
Question telnet script
Hi,

I need a script that take one parameter as destination hostname and two parameter as ranges and tries telnet and records the successful connections.

fo reg:

./testtelnet.sh destination-host 1000 1050

should give me all the port between 1000 and 1050 what successfully connected to destination.

Regards,
Mohtashim
# 2  
Old 09-29-2011
sort of a port scan?

Have you looked at nmap?
# 3  
Old 09-29-2011
Question
Code:
nmap
bash: nmap: command not found

I do not have nmap nor do i know what is it for.

./testtelnet.sh destination-host 1000 1050

if I am able to connect on port 1010 to destination-host it should populate in output.

Similarly i wish to give an option to see unsuccessful connection ports only and not the ones that got connected.
# 4  
Old 09-29-2011
telnet of all the possible ways is probably the least useful for this, as you can't set a timeout properly, nor get a meaningful, parseable output. Better would be
  • Installing nmap
  • If that's not possible using netcat/nc, installing it if possible
  • If that's not possible using the socket feature newer versions of bash support
  • And only if nothing of these is useable resort to telnet

Example of how easy it's with netcat/nc:
Code:
for port in {1000..1050}; do nc -z -w 3 1.2.3.4 $port && echo "Port $port open" || echo "Port $port closed"; done

# 5  
Old 09-29-2011
you can create a script which will read from a file hostname and port, than you can analyse the string output (refused) or (connected). Make sense?
Code:
echo " " | telnet hostame port


Moderator's Comments:
Mod Comment Video tutorial on how to use code tags in The UNIX and Linux Forums.
Last edited by Franklin52; 09-30-2011 at 03:46 AM.. Reason: Please use code tags, thank you
# 6  
Old 09-30-2011
Code:
nc -vw2 localhost 1000-1050

Last edited by Scott; 09-30-2011 at 04:52 AM.. Reason: Code tags
# 7  
Old 09-30-2011
Error
Quote:
Originally Posted by pludi
telnet of all the possible ways is probably the least useful for this, as you can't set a timeout properly, nor get a meaningful, parseable output. Better would be
  • Installing nmap
  • If that's not possible using netcat/nc, installing it if possible
  • If that's not possible using the socket feature newer versions of bash support
  • And only if nothing of these is useable resort to telnet

Example of how easy it's with netcat/nc:
Code:
for port in {1000..1050}; do nc -z -w 3 1.2.3.4 $port && echo "Port $port open" || echo "Port $port closed"; done


My server is a production server and I can't installing anything, for I am not the admin and it requires approvals.

Would someone help me with the correct netstat script to figure which ports are connecting and which are not.
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