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#! /usr/bin/expect --
##
## $Id: csblogin,v 1.3 2010-01-28 13:12:00 bjorn Exp $
##
## rancid 2.3.2a8
## Copyright (c) 1997-2007 by Terrapin Communications, Inc.
## All rights reserved.
##
## This code is derived from software contributed to and maintained by
## Terrapin Communications, Inc. by Henry Kilmer, John Heasley, Andrew Partan,
## Pete Whiting, Austin Schutz, and Andrew Fort.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions
## are met:
## 1. Redistributions of source code must retain the above copyright
##    notice, this list of conditions and the following disclaimer.
## 2. Redistributions in binary form must reproduce the above copyright
##    notice, this list of conditions and the following disclaimer in the
##    documentation and/or other materials provided with the distribution.
## 3. All advertising materials mentioning features or use of this software
##    must display the following acknowledgement:
##        This product includes software developed by Terrapin Communications,
##        Inc. and its contributors for RANCID.
## 4. Neither the name of Terrapin Communications, Inc. nor the names of its
##    contributors may be used to endorse or promote products derived from
##    this software without specific prior written permission.
## 5. It is requested that non-binding fixes and modifications be contributed
##    back to Terrapin Communications, Inc.
##
## THIS SOFTWARE IS PROVIDED BY Terrapin Communications, INC. AND CONTRIBUTORS
## ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
## TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
## PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COMPANY OR CONTRIBUTORS
## BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
## CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
## SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
## INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
## CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
## ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
## POSSIBILITY OF SUCH DAMAGE.
# 
#  The expect login scripts were based on Erik Sherk's gwtn, by permission.
#
# csblogin - Cisco/Linksys "Small Business" switch 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 \[-dV\] \[-c command\] \[-Evar=x\] \
\[-f cloginrc-file\] \[-p user-password\] \[-r passphrase\] \[-s script-file\] \
\[-u username\] \[-t timeout\] \[-x command-file\] \[-y ssh_cypher_type\] \
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 avenable 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)
} elseif {[ info exists env(USER) ]} {
    set default_user $env(USER)
} elseif {[ info exists env(LOGNAME) ]} {
    set default_user $env(LOGNAME)
} 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.
    if [ catch {exec id} reason ] {
	send_error "\nError: could not exec id: $reason\n"
	exit 1
    }
    regexp {\(([^)]*)} "$reason" junk default_user
}
if {[ info exists env(CLOGINRC) ]} {
    set password_file $env(CLOGINRC)
}

# Sometimes routers take awhile to answer (the default is 10 sec)
set timeout 120

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

    switch  -glob -- $arg {
	# Command to run.
	-c* -
	-C* {
	    if {! [  regexp .\[cC\](.+) $arg ignore command]} {
		incr i
		set command [ lindex $argv $i ]
	    }
	    set do_command 1
	# Expect debug mode
	} -d* {
	    exp_internal 1
	# Environment variable to pass to -s scripts
	} -E*
	{
	    if {[ regexp .\[E\](.+)=(.+) $arg ignore varname varvalue]} {
		set E$varname $varvalue
	    } else {
		send_user "\nError: invalid format for -E in $arg\n"
		exit 1
	    }
	# alternate cloginrc file
	} -f* -
	-F* {
	    if {! [ regexp .\[fF\](.+) $arg ignore password_file]} {
		incr i
		set password_file [ lindex $argv $i ]
	    }
	# user Password
	} -p* -
	-P* {
	    if {! [  regexp .\[pP\](.+) $arg ignore userpasswd]} {
		incr i
		set userpasswd [ lindex $argv $i ]
	    }
	    set do_passwd 0
	# Version string
	} -V* {
	    send_user "rancid 2.3.2a8\n"
	    exit 0
	# passphrase
	} -r* -
	-R* {
	    if {! [  regexp .\[rR\](.+) $arg ignore passphrase]} {
		incr i
		set avpassphrase [ lindex $argv $i ]
	    }
	# 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 "\nError: Can't read $sfile\n"
		exit 1
	    }
	    set do_script 1
	# Timeout
	} -t* -
	-T* {
	    if {! [ regexp .\[tT\](.+) $arg ignore timeout]} {
		incr i
		set timeout [ lindex $argv $i ]
	    }
	# Username
	} -u* -
	-U* {
	    if {! [  regexp .\[uU\](.+) $arg ignore user]} {
		incr i
		set username [ lindex $argv $i ]
	    }
	# command file
	} -x* -
	-X* {
	    if {! [  regexp .\[xX\](.+) $arg ignore cmd_file]} {
		incr i
		set cmd_file [ lindex $argv $i ]
	    }
	    if [ catch {set cmd_fd [open $cmd_file r]} reason ] {
		send_user "\nError: $reason\n"
		exit 1
	    }
            set cmd_text [read $cmd_fd]
            close $cmd_fd
            set command [join [split $cmd_text \n] \;]
            set do_command 1
	# 'ssh -c' cypher type
	} -y* -
	-Y* {
	    if {! [  regexp .\[yY\](.+) $arg ignore cypher]} {
		incr i
		set cypher [ lindex $argv $i ]
	    }
	} -* {
	    send_user "\nError: Unknown argument! $arg\n"
	    send_user $usage
	    exit 1
	} default {
	    break
	}
    }
}
# Process routers...no routers listed is an error.
if { $i == $argc } {
    send_user "\nError: $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 int_$var ; lappend int_$var $args}
proc include {args} {
    global env
    regsub -all "(^{|}$)" $args {} args
    if { [ regexp "^/" $args ignore ] == 0 } {
	set args $env(HOME)/$args
    }
    source_password_file $args
}

proc find {var router} {
  upvar int_$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 { password_file } {
    global env
    if { ! [file exists $password_file] } {
	send_user "\nError: password file ($password_file) does not exist\n"
	exit 1
    }
    file stat $password_file fileinfo
    if { [expr ($fileinfo(mode) & 007)] != 0000 } {
	send_user "\nError: $password_file must not be world readable/writable\n"
	exit 1
    }
    if [ catch {source $password_file} reason ] {
	send_user "\nError: $reason\n"
	exit 1
    }
}

# Log into the router.
# returns: 0 on success, 1 on failure
proc login { router user passwd cmethod cyphertype identfile} {
    global spawn_id in_proc do_command do_script passphrase prompt
    global sshcmd
    set in_proc 1

    # try each of the connection methods in $cmethod until one is successful
    set progs [llength $cmethod]
    foreach prog [lrange $cmethod 0 end] {
	incr progs -1
	if [string match "telnet*" $prog] {
	    regexp {telnet(:([^[:space:]]+))*} $prog command suffix port
	    if {"$port" == ""} {
		set retval [ catch {spawn telnet $router} reason ]
	    } else {
		set retval [ catch {spawn telnet $router $port} reason ]
	    }
	    if { $retval } {
		send_user "\nError: telnet failed: $reason\n"
		return 1
	    }
	} elseif ![string compare $prog "ssh"] {
	    # ssh to the router & try to login with or without an identfile.
	    # We use two calls to spawn since spawn does not seem to parse
	    # spaces correctly.
	    if {$identfile != ""} {
		if [ catch {spawn $sshcmd -c $cyphertype -x -l $user -i $identfile $router} reason ] {
		    send_user "\nError: failed to $sshcmd: $reason\n"
		    return 1
		}
	    } else {
		if [ catch {spawn $sshcmd -c $cyphertype -x -l $user $router} reason ] {
		    send_user "\nError: failed to $sshcmd: $reason\n"
		    return 1
		}
	    }
	} elseif ![string compare $prog "rsh"] {
	    send_error "\nError: unsupported method: rsh\n"
	    if { $progs == 0 } {
		return 1
	    }
	    continue
	} else {
	    send_user "\nError: unknown connection method: $prog\n"
	    return 1
	}
	sleep 0.3

	# This helps cleanup each expect clause.
	expect_after {
	    timeout {
		send_user "\nError: TIMEOUT reached\n"
		catch {close}; catch {wait};
		if { $in_proc} {
	            return 1
		} else {
	            continue
		}
            } eof {
		send_user "\nError: EOF received\n"
		catch {close}; catch {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 {
	    -re "(Connection refused|Secure connection \[^\n\r]+ refused|Connection closed by)" {
		catch {close}; catch {wait};
		if !$progs {
		   send_user "\nError: Connection Refused ($prog)\n"; return 1
		}
	    }
            eof { send_user "\nError: Couldn't login\n"; wait; return 1
	    } -nocase "unknown host\r\n" {
		catch {close}; catch {wait};
		send_user "\nError: Unknown host\n"; wait; return 1
	    } "Host is unreachable" {
		catch {close}; catch {wait};
		send_user "\nError: Host Unreachable!\n"; wait; return 1
	    } "No address associated with name" {
		catch {close}; catch {wait};
		send_user "\nError: Unknown host\n"; wait; return 1
	    }
	    "Bad user name or password" {
			  send_user "\nError: Check your password for $router\n"
			  catch {close}; catch {wait}; return 1
			}
	    -re "Enter passphrase.*: " {
		# sleep briefly to allow time for stty -echo
		sleep 1
		send "$passphrase\r"
		exp_continue }
	    -re "(Host key not found |The authenticity of host .* be established).*\(yes\/no\)\?" {
		send "yes\r"
		send_user "\nHost $router added to the list of known hosts.\n"
		exp_continue }
	    -re "HOST IDENTIFICATION HAS CHANGED.* \(yes\/no\)\?"	{
		send "no\r"
		send_user "\nError: The host key for $router has changed.  Update the SSH known_hosts file accordingly.\n"
		return 1 }
	    -re "Offending key for .* \(yes\/no\)\?"   {
		send "no\r"
		send_user "\nError: host key mismatch for $router.  Update the SSH known_hosts file accordingly.\n"
		return 1 }
	    "Login Screen"	{
				  send "$user\t$passwd\r"
				  exp_continue
	    			}
	    "Switch Main Menu"	{
				  # send Ctrl+Z
				  sleep 1; send "send \032"
				  exp_continue
				}
	    ">"		{
				  send "lcli\r"
				  exp_continue
				}
	    -re "User Name:$"	{
	    	       		  send "$user\r"
				  exp_continue
				}
	    -re "Password:$"	{
	    	       		  send "$passwd\r"
				  exp_continue
				}

	    -re "$prompt"		{ break; }
	    denied	{ send_user "\nError: Check your password for $router\n"
	                  catch {close}; catch {wait}; 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 "terminal datadump\r"
    expect -re $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 "exit\r\n"
    expect {
	"\n"					{ exp_continue }
	timeout					{ catch {close}; catch {wait};
						  return 0
						}
	eof					{ return 0 }
    }
    set in_proc 0
}

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

    set prompt "#"

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

    # Figure out loginname's password (if different from the vty password)
    if {[info exists userpasswd]} {
      # command line passwd
      set passwd $userpasswd
    } else {
      set passwd [join [lindex [find userpassword $router] 0] ""]
      if { "$passwd" == "" } {
        set passwd [join [lindex [find password $router] 0] ""]
        if { "$passwd" == "" } {
	  send_user "\nError: no password for $router in $password_file.\n"
	  continue
        }
      }
    }

    # Figure out identity file to use
    set identfile [join [lindex [find identity $router] 0] ""]

    # Figure out passphrase to use
    if {[info exists avpassphrase]} {
	set passphrase $avpassphrase
    } else {
	set passphrase [join [lindex [find passphrase $router] 0] ""]
    }
    if { ! [string length "$passphrase"]} {
	set passphrase $passwd
    }

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

    # Figure out connection method
    set cmethod [find method $router]
    if { "$cmethod" == "" } { set cmethod {{telnet} {ssh}} }

    # Figure out the SSH executable name
    set sshcmd [find sshcmd $router]
    if { "$sshcmd" == "" } { set sshcmd {ssh} }

    # Login to the router
    if {[login $router $loginname $passwd $cmethod $cyphertype $identfile]} {
	incr exitval
	continue
    }

    if { $do_command } {
	if {[run_commands $prompt $command]} {
	    incr exitval
	    continue
	}
    } elseif { $do_script } {
	send "terminal datadump\r"
	expect -re $prompt	{}
	source $sfile
	catch {close};
    } else {
	label $router
	log_user 1
	interact
    }

    # End of for each router
    catch {wait};
    sleep 0.3
}
exit $exitval