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Telnet error- Escape character is '^]' and connection closed by foreign host

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Top Forums Shell Programming and Scripting Telnet error- Escape character is '^]' and connection closed by foreign host
# 1  
Old 04-10-2017
Telnet error- Escape character is '^]' and connection closed by foreign host
In program, I want to telnet the ports present in telnet.txt file and capture screenshot of open port which is opened on new terminal.

Problems:
  1. Escape character is '^]' and Connection closed by foreign host.
  2. Loop is not working properly. It only take one ports and closed the connection.

My program:

Code:
readfile()
{
while read -r line
do
name="$line"
echo "$name"
count=$line
xterm -e telnet $line
telnet $line
((count++))
gnome-screenshot xterm -e telnet $line
done < telnet.txt
}
readfile

telnet.txt
Code:
192.168.1.95     1027
192.168.1.95     1028
192.168.1.95     1030
192.168.1.95     2869
192.168.1.95     5357
192.168.1.95     10243
192.168.1.95     135
192.168.1.95     139
192.168.1.95     445
192.168.1.95     554
192.168.1.95     902
192.168.1.95     912
192.168.1.95     1025
192.168.1.95     1026


Output:
Code:
192.168.1.95     1027
Trying 192.168.1.95...
Connected to 192.168.1.95.
Escape character is '^]'.
Connection closed by foreign host.

Last edited by rbatte1; 04-18-2017 at 12:53 PM.. Reason: Converted textual numbered list to formatted numbered list with LIST=1 tags
# 2  
Old 04-10-2017
Hmm.
Use a here document.
You can change the escape character in telnet - example set to capital letter F
This sets the escape character, connects to some remote node, then exits.
Code:
telnet  << !
set escape F
open $line
F
close
!

Plus, you seem to be making several connections to the same host.

Code:
xterm -e telnet $line
telnet $line
.... 
gnome-screenshot xterm -e telnet $line

# 3  
Old 04-13-2017
Telnet error- Escape character is '^]' and connection closed by foreign host
Still it gives below error. Please help.

Program-
Code:
readfile()
{
while read -r line
do
name="$line"
echo "$name"
count=$line
telnet  << !
set escape F
open $line
xterm -e telnet $line
telnet $line
((count++))
F
close
!
gnome-screenshot xterm -e telnet $line
done < telnet.txt
}
readfile

Output-

Code:
192.168.1.95     1027
telnet>Escape character is 'F'.
telnet>Trying 192.168.1.95...
Connected to 192.168.1.95.
Escape character is 'F'.
Connection closed by foreign host.
telnet> escape character is 'F'.
telnet> (to) usage: open [-l user] [-a] host-name [port]
telnet> telnet> ?Invalid command
telnet> ?Invalid command
telnet> telnet> ?Invalid command
telnet> Need to be connected first for `bye'.

Last edited by sk151993; 04-16-2017 at 08:01 AM..
# 4  
Old 04-18-2017
Please help me if any one has idea about telnet script.
# 5  
Old 04-18-2017
Are you able you connect to the remote host manually in a telnet session? You may want to introduce some split second delays between the telnet commands in your script.
# 6  
Old 04-18-2017
To be honest i don't get the point of some parts of your script. The three lines marked bold make absolutely no sense at all and should be removed from the here-document:

Code:
readfile()
{
while read -r line
do
name="$line"
echo "$name"
count=$line
telnet  << !
set escape F
open $line
xterm -e telnet $line
telnet $line
((count++))
F
close
!
gnome-screenshot xterm -e telnet $line
done < telnet.txt
}
readfile

Understand that, whatever you put between "<< !" and "!" goes as input/command to your telnet session. Ask yourself if you want to give "xterm -e telnet $line" as a command to your telnet session - most probably not, i suppose. The same goes for "((count++))": what should telnet make of that?

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
jim mcnamara
# 7  
Old 04-18-2017
bakunin makes some great points. I did not understand your script either.
You appear to do things that require a shell command line rather than something telnet does.

Instead of telling us how you want to do something, pretend you do not know how to do it. Give us some requirements. Then we can work with you to get what you need.

Example:
I need to graph some data that lives on another machine. But I need to have it run on my desktop machine.
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