#!/usr/local/bin/expect --
##
##
## 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.
##
##
#
# jlogin - juniper ssh login
#
## Most options are intuitive for logging into a Cisco router.
## The default username password is the same as the vty password.
#

# Usage line
set usage "Usage: $argv0 \[-e encryption_type\] \[-u username\] \[-p user-password\]\
\[-f cloginrc-file\] \[-c command\] \[-s script-file\]\
router \[router...\]\n"

# env(CLOGIN) may contain the following chars:
#	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 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 ]
	    }
	# user Password
	} -p* -
	-P* {
	    if {! [  regexp .\[pP\](.+) $arg ignore userpswd]} {
		incr i
		set userpswd [ lindex $argv $i ]
	    }
	    set do_passwd 0
	# 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
	# encryption type
	} -e* -
	-E* {
	    if {! [  regexp .\[eE\](.+) $arg ignore encrypt]} {
		incr i
		set encrypt [ lindex $argv $i ]
	    }
	# alternate cloginrc file
	} -f* -
	-F* {
	    if {! [ regexp .\[fF\](.+) $arg ignore password_file]} {
		incr i
		set password_file [ lindex $argv $i ]
	    }
	} -* {
	    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
  }
  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 passwd prompt encrypttype} {
    global spawn_id in_proc do_command do_script
    set in_proc 1

    # ssh to the router & try to login.
    if [ catch {spawn ssh -c $encrypttype -x -l $user $router} reason ] {
	send_user "Error: failed to ssh: $reason\n"
	exit 1
    }
    sleep 0.3

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

    # Here we get a little tricky.  There are several possibilities:
    # the router can ask for a username and passwd and then
    # talk to the TACACS server to authenticate you, or if the
    # TACACS server is not working, then it will use the enable
    # passwd.  Or, the router might not have TACACS turned on,
    # then it will just send the passwd.
    expect {
        eof { send_user "Error: Couldn't login\n"; wait; return 1 }
	"Connection refused" { 
	    expect eof
	    send_user "Error: Connection Refused\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 "Host key not found .* \(yes\/no\)\?"	{
	    send "yes\r"
	    send_user "Host $router added to the list of known hosts.\n"
	    exp_continue }
	-re "HOST IDENTIFICATION HAS CHANGED.* \(yes\/no\)\?"	{
	    send "no\r"
	    send_user "Error: The host key for $router has changed.  update the known_hosts file accordingly.\n"
	    return 1 }
	-re "(Username|^login):"	{ send "$user\r"
	    expect { 
		eof             	{ send_user "Error: Couldn't login\n"; wait; return 1 }
		-re "\[Pp]assword:"	{ send "$passwd\r" }
		"$prompt"		{ set in_proc 0; return 0 }
	    }
	    exp_continue
	}
	"\[Pp]assword:"	{ send "$passwd\r"
	    expect { 
		eof             { send_user "Error: Couldn't login\n"; wait; return 1 }
		"$prompt"       { set in_proc 0; return 0 }
	    }
	    exp_continue
	}
	"$prompt"       { }
	denied		{ send_user "Error: Check your passwd for $router\n" 
	                  if { $do_command || $do_script } {	
			      send "quit"
			      wait
			      return 1
			  } else {
			      return 1
			  }
	                }
	"% Bad passwords" {send_user "Error: Check your passwd for $router\n"; return 1 }
    }
    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 "set cli complete-on-space off\r"
    expect $prompt	{}
    send "set cli screen-length 0\r"
    expect $prompt {}

    # 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 "[lindex $commands $i]\r"
	    expect {
		-re "^\[^\n\r *]*$prompt $"	{}
		-re "^\[^\n\r]*$prompt."	{ exp_continue }
		-re "(\r\n|\n)"			{ exp_continue }
            }
	}
    } else {
	send "$command\r"
	expect {
		-re "^\[^\n\r *]*$prompt $"	{}
		-re "^\[^\n\r]*$prompt."	{ exp_continue }
		-re "(\r\n|\n)"			{ exp_continue }
	}
    }
    send "quit\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"

    set prompt ">"

    # 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
#      } 
#      if { $do_enapasswd && !$autoenable && [llength $pswd] < 2 } {
#	send_user "Error - no enable password for $router in $password_file."
#        continue
#      }
#	set passwd [lindex $pswd 0]
#    }

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

    # Figure out loginname's password (if different from the vty password)
    if {[info exists userpswd]} {
      # command line passwd
      set passwd $userpswd
    } else {
      set passwd [lindex [find password $loginname@$router] 0]
      if { "$passwd" == "" } { set passwd [lindex [find password $router] 0] }
    } 

    # Figure out encryption tpye
    if {[info exists encrypt]} {  
      # command line encryption type
      set encrypttype $encrypt
    } else {
      set encrypttype "3des"
    } 

    # Login to the router
    if {[login $router $loginname $passwd $prompt $encrypttype]} {
	continue
    }

    if { $do_command } {
	if {[run_commands $prompt $command]} {
	    continue
	}
    } elseif { $do_script } {
	send "set cli complete-on-space off\r"
	expect $prompt	{}
	send "set cli screen-length 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