1#!/usr/bin/expect --
2
3# ssh using the parms provided by the caller.  The benefit provided by this
4# program is that it will enter the password for you (i.e. non-interactively).
5
6# Description of arguments:
7# Arg0: The password.
8# Arg1: The ssh parm string.  This is the totality of ssh parms you wish to
9#       specify (e.g. userid, host, etc.).
10
11
12###############################################################################
13# Main
14
15  # Get arguments.
16  set password [lindex $argv 0]
17  set ssh_parms [lreplace $argv 0 0]
18
19  eval spawn ssh ${ssh_parms}
20
21  set timeout 30
22
23  set max_attempts 3
24
25  set attempts 0
26  while { 1 } {
27    incr attempts 1
28    expect {
29      -re "assword:" {
30        send "$password\r"
31        break
32      }
33      -re "Are you sure you want to continue connecting" {
34        if { $attempts > $max_attempts } {
35          puts stderr "**ERROR** Exceeded $max_attempts attempts to ssh."
36          exit 1
37        }
38        send "yes\r"
39      }
40      timeout {
41        puts stderr "**ERROR** Timed out waiting for password prompt."
42        exit 1
43      }
44      eof {
45        puts stderr "**ERROR** End of data waiting for password prompt."
46        exit 1
47      }
48    }
49  }
50
51  set timeout 3
52  expect {
53    "Permission denied, please try again." {
54      puts ""
55      puts "**ERROR** Incorrect userid or password provided to this program."
56      exit 1
57    }
58  }
59
60  set timeout -1
61
62  # We don't ever expect to see this string.  This will keep this program
63  # running indefinitely.
64  set never_string "When in the course of human events, it becomes :"
65  if { [ catch {expect { "${never_string}" {send "whatever\r"} }} result ] } {
66    set child_died {expect:[ ]spawn[ ]id[ ]exp4[ ]not[ ]open}
67    if { [regexp -expanded ${child_died} $result] } {
68      # The child died.  This is not necessarily an error (for example, the
69      # user may have included a command string to run on the target).
70      exit 0
71    } else {
72      puts $result
73      exit 1
74    }
75  }
76
77  exit 0
78
79###############################################################################
80
81