Socket TCL

You can actually use examples directly to the communications server Tcl on IOS with some minor mods.  Take a look at

http://www.tcl.tk/about/netserver.html .  What you need to do, is to wrap these scripts in the syntax of the EEM.  For example, on the side Server:

::cisco::eem::event_register_none

namespace import ::cisco::eem::*

namespace import ::cisco::lib::*
array set arr_einfo [event_reqinfo]
# Echo_Server --

#     Open the server listening socket

#     and enter the Tcl event loop

#

# Arguments:

#     port     The server's port number
proc Echo_Server {port} {

    set s [socket -server EchoAccept $port]

    vwait forever

}
# Echo_Accept --

#     Accept a connection from a new client.

#     This is called after a new socket connection

#     has been created by Tcl.

#

# Arguments:

#     sock     The new socket connection to the client

#     addr     The client's IP address

#     port     The client's port number

     

proc EchoAccept {sock addr port} {

    global echo
# Record the client's information
puts "Accept $sock from $addr port $port"

    set echo(addr,$sock) [list $addr $port]
# Ensure that each "puts" by the server

    # results in a network transmission
fconfigure $sock -buffering line
# Set up a callback for when the client sends data
fileevent $sock readable [list Echo $sock]

}
# Echo --

#     This procedure is called when the server

#     can read data from the client

#

# Arguments:

#     sock     The socket connection to the client
proc Echo {sock} {

    global echo
# Check end of file or abnormal connection drop,

    # then echo data back to the client.
if {[eof $sock] || [catch {gets $sock line}]} {

     close $sock

     puts "Close $echo(addr,$sock)"

     unset echo(addr,$sock)

    } else {

     puts $sock $line

    }

}
Echo_Server $arr_einfo(arg1)


Save as EEM Tcl font (assuming that this script lives in flash: / policies such as no_echo_server.tcl on the device):
Event Manager user Directorystrategie flash: / policies
political event manager no_echo_server.tcl
Then run it from the EXEC mode:
Manager of event executed no_echo_server.tcl 3333
That starts a socket listening on tcp/3333 on this unit.
On the client machine, create a script named no_echo_client.tcl with:
::cisco::eem::event_register_none

namespace import ::cisco::eem::*

namespace import ::cisco::lib::*
array set arr_einfo [event_reqinfo]
#

# A client of the echo service.

#
proc Echo_Client {host port} {

    set s [socket $host $port]

    fconfigure $s -buffering line

    return $s

}
set sock [Echo_Client $arr_einfo(arg1) $arr_einfo(arg2)]

puts $sock "Hello!"

gets $sock response

puts "Response is $response"


Yet once, register for this policy, then run it from EXEC mode with:
Manager of event executed no_echo_client.tcl 10.1.1.1 3333
10.1.1.1 pointing to the IP address of the first (that is, the server) device.
That's all.  This is a simple client/server example on IOS with EEM.
 
         
 
         
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 Tags: Cisco Network
 
         
         
 
          
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