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Top Forums Shell Programming and Scripting Need help with Expect script for Cisco IPS Sensors, Expect sleep and quoting Post 302344838 by genewolfe on Monday 17th of August 2009 07:08:07 PM
Old 08-17-2009
Need help with Expect script for Cisco IPS Sensors, Expect sleep and quoting

This Expect script provides expect with a list of IP addresses to Cisco IPS sensors and commands to configure Cisco IPS sensors. The user, password, IP addresses, prompt regex, etc. have been anonymized. In general this script will log into the sensors and send commands successfully but there are some problems I haven't been able to solve.

Delays in prompts, Sleep timers:
1. Sometimes the script appears to send the next command before the next prompt appears in which case the correct command is skipped and the one afterwards sent and accepted. The commands usually need to be entered in order so this usually produces an error. For example Expect sends "service signature-definition sig0" and the sensor receives it but the sensor takes 5-10 seconds to provide the next prompt. The possibility of this long delay which will cause an error has forced me to insert a sleep timer after each command is sent in my loop. One problem with that is if the delay is even longer than my sleep timer I still get an error. Another problem is the script takes forever because there's a 10 second pause after every command. Is using a sleep timer the only or best solution to this problem?

Quoting, Escaping \. in Regex
2. From what I can tell in Expect if I don't quote the command "configure terminal" it's received at the IPS sensor as 2 separate commands so I have to quote it. I don't know if this is causing this problem but for some reason when I use this script the regex string 10\.1\.1\.100 ends up being sent to the IPS sensor without the backslashes 10.1.1.100 but I don't want the regular expression dot . evaluated I just want an IP address with periods i.e. with the periods escaped with the backslash. Something about my Expect script is causing this problem because when I log into an IPS sensor using ssh and copy and paste the commands into the IPS sensors manually the regex string is saved with the backslashes. I've tried removing the quotes and I've also tried double quoting and neither work. Does anyone know what I'm doing wrong here or what I could try to use Expect to send a regex string with backslashes intact?

Code:
#!/usr/bin/expect

log_user 1

set timeout 10

set user "user"

set password "password"

set ip_list {
	10.1.1.10
	10.1.2.10
	10.1.3.10
	10.1.4.10
	}

set cmd_list {
	"configure terminal"
    "service signature-definition sig0"
	"signatures 60000 0"
	"alert-severity high"
	"sig-fidelity-rating 100"
	"sig-description"
	"sig-name Foo"
	"sig-string-info Foo"
	"no sig-comment"
	"exit"
	"engine string-tcp"
	"regex-string 10\.1\.1\.100"
	"service-ports 0-65535"
	"direction from-service"
	"exit"
	"exit"
	"exit"
    }

foreach ip $ip_list {
    if {$ip != ""} {

        # Connect
        spawn ssh $user@$ip

		expect "?assword*"
		send "$password\r"

        set prompt "(IPS....#)"

        foreach command $cmd_list {
            if {$command != ""} {
                expect -re $prompt {
			send "$command\r"
			sleep 5
                }
            }
        }

		expect -re "Apply Changes" {
      		send -- "yes\r"
		}

        expect -re $prompt {
            send -- "exit\r"
        }

        close
    }
}

send_user "\nDone.\n"

 

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RUNSCRIPT(1)						      General Commands Manual						      RUNSCRIPT(1)

NAME
runscript - script interpreter for minicom SYNOPSIS
runscript scriptname [logfile [homedir]] DESCRIPTION
runscript is a simple script interpreter that can be called from within the minicom communications program to automate tasks like logging in to a unix system or your favorite bbs. INVOCATION
The program expects a script name and optionally a filename and the user's home directory as arguments, and it expects that it's input and output are connected to the "remote end", the system you are connecting to. All messages from runscript ment for the local screen are directed to the stderr output. All this is automatically taken care of if you run it from minicom. The logfile and home directory parame- ters are only used to tell the log command the name of the logfile and where to write it. If the homedir is omitted, runscript uses the directory found in the $HOME environment variable. If also the logfile name is omitted, the log commands are ignored. KEYWORDS
Runscript recognizes the following commands: expect send goto gosub return ! exit print set inc dec if timeout verbose sleep break call log OVERVIEW OF KEYWORDS
send <string> <string> is sent to the modem. It is followed by a ' '. <string> can be: - regular text, eg 'send hello' - text enclosed in quotes, eg 'send "hello world"' Within <string> the following sequences are recognized: - newline - carriage return a - bell  - backspace c - don't send the default ' '. f - formfeed o - send character o (o is an octal number) Also $(environment_variable) can be used, for example $(TERM). Minicom passes three special environment variables: $(LOGIN), which is the username, $(PASS), which is the password, as defined in the proper entry of the dialing directory, and $(TERMLIN) which is the number of actual terminal lines on your screen (that is, the statusline excluded). print <string> Prints <string> to the local screen. Default followed by ' '. See the description of 'send' above. label: Declares a label (with the name 'label') to use with goto or gosub. goto <label> Jump to another place in the program. gosub <label> Jumps to another place in the program. When the statement 'return' is encountered, control returns to the statement after the gosub. Gosub's can be nested. return Return from a gosub. ! <command> Runs a shell for you in which 'command' is executed. On return, the variable '$?' is set to the exit status of this command, so you can subsequently test it using 'if'. exit [value] Exit from "runscript" with an optional exit status. (default 1) set <variable> <value> Sets the value of <variable> (which is a single letter a-z) to the value <value>. If <variable> does not exist, it will be created. <value> can be a integer value or another variable. inc <variable> Increments the value of <variable> by one. dec <variable> Decrements the value of <variable> by one. if <value> <operator> <value> <statement> Conditional execution of <statement>. <operator> can be <, >, != or =. Eg, 'if a > 3 goto exitlabel'. timeout <value> Sets the global timeout. By default, 'runscript' will exit after 120 seconds. This can be changed with this command. Warning: this command acts differently within an 'expect' statement, but more about that later. verbose <on|off> By default, this is 'on'. That means that anything that is being read from the modem by 'runscript', gets echoed to the screen. This is so that you can see what 'runscript' is doing. sleep <value> Suspend execution for <value> seconds. expect expect { pattern [statement] pattern [statement] [timeout <value> [statement] ] .... } The most important command of all. Expect keeps reading from the input until it reads a pattern that matches one of the specified ones. If expect encounters an optional statement after that pattern, it will execute it. Otherwise the default is to just break out of the expect. 'pattern' is a string, just as in 'send' (see above). Normally, expect will timeout in 60 seconds and just exit, but this can be changed with the timeout command. break Break out of an 'expect' statement. This is normally only useful as argument to 'timeout' within an expect, because the default action of timeout is to exit immediately. call <scriptname> Transfers control to another scriptfile. When that scriptfile finishes without errors, the original script will continue. log <text> Write text to the logfile. NOTES
If you want to make your script to exit minicom (for example when you use minicom to dial up your ISP, and then start a ppp or slip session from a script), try the command "! killall -9 minicom" as the last script command. The -9 option should prevent minicom from hanging up the line and resetting the modem before exiting. Well, I don't think this is enough information to make you an experienced 'programmer' in 'runscript', but together with the examples it shouldn't be too hard to write some useful script files. Things will be easier if you have experience with BASIC. The minicom source code comes together with two example scripts, scriptdemo and unixlogin. Especially the last one is a good base to build on for your own scripts. BUGS
Runscript should be built in to minicom. AUTHOR
Miquel van Smoorenburg, <miquels@drinkel.ow.org> Jukka Lahtinen, <walker@clinet.fi> User's Manual $Date: 2000/02/10 10:28:00 $ RUNSCRIPT(1)
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