#!@EXPECT_PATH@ --
##
##
## Copyright (C) 1997 by Henry Kilmer, Erik Sherk and Pete Whiting.
## All rights reserved.
##
## This software may be freely copied, modified and redistributed without
## fee for non-commerical purposes provided that this copyright notice is
## preserved intact on all copies and modified copies.
##
## There is no warranty or other guarantee of fitness of this software.
## It is provided solely "as is". The author(s) disclaim(s) all
## responsibility and liability with respect to this software's usage
## or its effect upon hardware, computer systems, other software, or
## anything else.
##
##
#
# elogin - ADC EZT3 login
#
# Most options are intuitive for logging into an ADC EZT3 mux.
#

# Usage line
set usage "Usage: $argv0 \[-noenable\] \[-c command\] \
\[-f cloginrc-file\] \[-p user-password\] \
\[-s script-file\] \[-t timeout\] \[-u username\] \
\[-v vty-password\] \[-w enable-username\] \[-x command-file\] \
\[-y ssh_cypher_type\] router \[router...\]\n"

# env(CLOGIN) may contain:
#	x == do not set xterm banner or name

# Password file
set password_file $env(HOME)/.cloginrc
# Default is to login to the router
set do_command 0
set do_script 0
# The default is to automatically enable
set enable 1
# The default is that you login non-enabled (tacacs can have you login already enabled)
set autoenable 0
# The default is to look in the password file to find the passwords.  This
# tracks if we receive them on the command line.
set do_passwd 1

# Find the user in the ENV, or use the unix userid.
if {[ info exists env(CISCO_USER) ] } {
    set default_user $env(CISCO_USER)
} else {
    # This uses "id" which I think is portable.  At least it has existed
    # (without options) on all machines/OSes I've been on recently -
    # unlike whoami or id -nu.
    regexp {\(([^)]*)} [exec id] junk default_user
}

# Sometimes routers take awhile to answer (the default is 10 sec)
set timeout 45

# Process the command line
for {set i 0} {$i < $argc} {incr i} {
    set arg [lindex $argv $i]

    switch  -glob -- $arg {
	# Username
	-u* -
	-U* {
	    if {! [  regexp .\[uU\](.+) $arg ignore user]} {
		incr i
		set username [ lindex $argv $i ]
	    }
	# VTY Password
	} -p* -
	-P* {
	    if {! [  regexp .\[pP\](.+) $arg ignore userpasswd]} {
		incr i
		set userpasswd [ lindex $argv $i ]
	    }
	    set do_passwd 0
	# VTY Password
	} -v* -
	-v* {
	    if {! [  regexp .\[vV\](.+) $arg ignore passwd]} {
		incr i
		set passwd [ lindex $argv $i ]
	    }
	    set do_passwd 0
	# Enable Username
	} -w* -
	-W* {
	# ignore -w
	# Enable Password
	} -e* -
	-E* {
	# ignore -e
	# Command to run.
	} -c* -
	-C* {
	    if {! [  regexp .\[cC\](.+) $arg ignore command]} {
		incr i
		set command [ lindex $argv $i ]
	    }
	    set do_command 1
	# Expect script to run.
	} -s* -
	-S* {
	    if {! [  regexp .\[sS\](.+) $arg ignore sfile]} {
		incr i
		set sfile [ lindex $argv $i ]
	    }
	    if { ! [ file readable $sfile ] } {
		send_user "Error: Can't read $sfile\n"
		exit 1
	    }
	    set do_script 1
	# 'ssh -c' cypher type
	} -y* -
	-Y* {
	    if {! [  regexp .\[eE\](.+) $arg ignore cypher]} {
		incr i
		set cypher [ lindex $argv $i ]
	    }
	# alternate cloginrc file
	} -f* -
	-F* {
	    if {! [ regexp .\[fF\](.+) $arg ignore password_file]} {
		incr i
		set password_file [ lindex $argv $i ]
	    }
	# Timeout
	} -t* -
	-T* {
	    if {! [ regexp .\[tT\](.+) $arg ignore timeout]} {
		incr i
	        set timeout [ lindex $argv $i ]
	    }
	# Command file
	} -x* -
	-X {
	    if {! [  regexp .\[xX\](.+) $arg ignore cmd_file]} {
		incr i
		set cmd_file [ lindex $argv $i ]
	    }
	    set cmd_fd [open $cmd_file r]
	    set cmd_text [read $cmd_fd]
	    close $cmd_fd
	    set command [join [split $cmd_text \n] \;]
	    set do_command 1
	# Do we enable?
	} -noenable {
	# ignore -noenable
	# Does tacacs automatically enable us?
	} -autoenable {
	# ignore -autoenable
	} -* {
	    send_user "Error: Unknown argument! $arg\n"
	    send_user $usage
	    exit 1
	} default {
	    break
	}
    }
}
# Process routers...no routers listed is an error.
if { $i == $argc } {
    send_user "Error: $usage"
}

# Only be quiet if we are running a script (it can log its output
# on its own)
if { $do_script } {
    log_user 0
} else {
    log_user 1
}

#
# Done configuration/variable setting.  Now run with it...
#

# Sets Xterm title if interactive...if its an xterm and the user cares
proc label { host } {
    global env
    # if CLOGIN has an 'x' in it, don't set the xterm name/banner
    if [info exists env(CLOGIN)] {
	if {[string first "x" $env(CLOGIN)] != -1} { return }
    }
    # take host from ENV(TERM)
    if [info exists env(TERM)] {
	if [regexp \^(xterm|vs) $env(TERM) ignore ] {
	    send_user "\033]1;[lindex [split $host "."] 0]\a"
	    send_user "\033]2;$host\a"
	}
    }
}

# This is a helper function to make the password file easier to
# maintain.  Using this the password file has the form:
# add password sl*	pete cow
# add password at*	steve
# add password *	hanky-pie
proc add {var args} { global $var ;lappend $var $args}
proc find {var router} {
  source_password_file
  upvar $var list
  if { [info exists list] } {
    foreach line $list {
      if { [string match [lindex $line 0] $router ] } {
	return [lrange $line 1 end]
      }
    }
  }
  return {}
}

# Loads the password file.  Note that as this file is tcl, and that
# it is sourced, the user better know what to put in there, as it
# could install more than just password info...  I will assume however,
# that a "bad guy" could just as easy put such code in the clogin
# script, so I will leave .cloginrc as just an extention of that script
proc source_password_file { } {
    global env password_file read_password_file
    if { [info exists read_password_file] } { return }
    if { [info exists password_file] == 0 } {
	set password_file $env(HOME)/.cloginrc
    }
    if { ! [file exists $password_file] } {
	send_user "Error: password file ($password_file) does not exist\n"
	exit 1
    }
    set read_password_file 1
    file stat $password_file fileinfo
    if { [expr ($fileinfo(mode) & 007)] != 0000 } {
	send_user "Error: $password_file must not be world readable/writable\n"
	exit 1
    }
    source $password_file
}

# Log into the router.
proc login { router user userpswd passwd prompt cyphertype } {
    global spawn_id in_proc do_command do_script
    global u_prompt p_prompt
    set in_proc 1
    set tryssh 1

    # Telnet to the router & try to login.
    if [ catch {spawn telnet $router} reason ] {
	send_user "Error: failed to telnet: $reason\n"
	exit 1
    }
    sleep 0.3

    # This helps cleanup each expect clause.
    expect_after {
	timeout {
	    send_user "\nError: TIMEOUT reached\n"
	    catch {close}; wait
	    if { $in_proc} {
		return 1
	    } else {
		continue
	    }
	} eof {
	    send_user "\nError: EOF received\n"
	    catch {close}; wait
	    if { $in_proc} {
		return 1
	    } else {
		continue
	    }
	}
    }

    expect {
	"Connection refused" {
	    close; wait
	    sleep 0.3
		expect eof
		send_user "Error: Connection Refused\n"; wait; return 1
	} eof { send_user "Error: Couldn't login\n"; wait; return 1
	} "Unknown host\r\n" {
	    expect eof
	    send_user "Error: Unknown host\n"; wait; return 1
	} "Host is unreachable" {
	    expect eof
	    send_user "Error: Host Unreachable!\n"; wait; return 1
	} "No address associated with name" {
	    expect eof
	    send_user "Error: Unknown host\n"; wait; return 1
	}
	-re "$u_prompt"	{ send "$user\r"
	    expect {
		"Login incorrect"	{ send_user "Error: Couldn't login\n";
					  catch {close}; wait; return 1 }
		eof			{ send_user "Error: Couldn't login\n"; wait; return 1 }
		-re "$p_prompt"		{ send "$userpswd\r" }
		"$prompt"		{ set in_proc 0; return 0 }
	    }
	    exp_continue
	}
	-re "$p_prompt"	{ send "$passwd\r"
	    expect {
		"Password incorrect"	{ send_user "Error: Couldn't login\n";
					  catch {close}; wait; return 1 }
		eof		{ send_user "Error: Couldn't login\n"; wait; return 1 }
		"$prompt"	{ set in_proc 0; return 0 }
	    }
	    exp_continue
	}
	"Password incorrect"	{ send_user "Error: Check your password for $router\n";
				  catch {close}; wait; return 1 }
	"$prompt"	{ }
	denied		{ send_user "Error: Check your passwd for $router\n"
			    if { $do_command || $do_script } {
			      send "exit\r"
			      wait
			      return 1
			  } else {
			      return 1
			  }
			}
	"\r\n"	{ exp_continue; }
    }
    set in_proc 0
    return 0
}

# Run commands given on the command line.
proc run_commands { prompt command } {
    global in_proc
    set in_proc 1

    send "screen 0\r"
    expect $prompt {}

    regsub -all "\[)(]" $prompt {\\&} reprompt

    # Is this a multi-command?
    if [ string match "*\;*" "$command" ] {
	set commands [split $command \;]
	set num_commands [llength $commands]

	for {set i 0} {$i < $num_commands} { incr i} {
	    send "[subst -nocommands [lindex $commands $i]]\r"
	    expect {
		-re "^\[^\n\r]*$reprompt."	{ exp_continue }
		-re "^\[^\n\r *]*$reprompt"	{}
		-re "\[\n\r]"			{ exp_continue }
	    }
	}
    } else {
	send "[subst -nocommands $command]\r"
	expect {
		-re "^\[^\n\r]*$reprompt."	{ exp_continue }
		-re "^\[^\n\r *]*$reprompt"	{}
		-re "\[\n\r]"			{ exp_continue }
	}
    }
    send "exit\r"
    expect {
	"\n" { exp_continue }
	timeout { return 0 }
	eof { return 0 }
    }
    set in_proc 0
}

#
# For each router... (this is main loop)
#
set in_proc 0
foreach router [lrange $argv $i end] {
    set router [string tolower $router]
    send_user "$router\n"

    # Figure out prompt.
    set prompt "Active) > "
	    set autoenable 1
	    set enable 0

    # Figure out passwords
    if { $do_passwd } {
      set pswd [find password $router]
      if { [llength $pswd] == 0 } {
	send_user "Error - no password for $router in $password_file.\n"
	continue
      }
      set passwd [lindex $pswd 0]
    }

    # Figure out username
    if {[info exists username]} {
      # command line username
      set ruser $username
    } else {
      set ruser [find user $router]
      if { "$ruser" == "" } { set ruser $default_user }
    }

    # Figure out username's password (if different from the vty password)
    if {[info exists userpasswd]} {
      # command line username
      set userpswd $userpasswd
    } else {
      set userpswd [find userpassword $router]
      if { "$userpswd" == "" } { set userpswd $passwd }
    }

    # Figure out prompts
    set u_prompt [find userprompt $router]
    if { "$u_prompt" == "" } { set u_prompt "(Username|login|  Login):" }
    set p_prompt [find passprompt $router]
    if { "$p_prompt" == "" } { set p_prompt "\[Pp]assword:" }

    # Figure out cypher type
    if {[info exists cypher]} {
      # command line cypher type
      set cyphertype $cypher
    } else {
      set cyphertype [find cyphertype $router]
      if { "$cyphertype" == "" } { set cyphertype "3des" }
    }

    # Login to the router
    if {[login $router $ruser $userpswd $passwd $prompt $cyphertype]} {
	continue
    }

    if { $do_command } {
	if {[run_commands $prompt $command]} {
	    continue
	}
    } elseif { $do_script } {
	send "screen 0\r"
	expect $prompt	{}
	source $sfile
	close
    } else {
	label $router
	log_user 1
	interact
    }

    # End of for each router
    wait
    sleep 0.3
}
exit 0