Linux认证之使用expect实现ssh自动交互
Linux认证之使用expect实现ssh自动交互使用expect实现ssh自动交互
下面是使用expect实现的自动远端命令执行的脚本ssh-exec：
#！/bin/sh
# \
exec expect -- “$0” ${1+“$@”}
# ssh-exec host user password command
# execute command on remote host
exp_version -exit 5.0
set ERR_PERMISSION_DENIED 1
set ERR_DIR_OR_FILE_NOT_EXIST 2
set ERR_TIMEOUT 3
set ERR_CONNECTION_REFUSED 4
set ERR_INVALID_ARGUMENT 5
proc auth_trans {password} {
upvar #0 ERR_PERMISSION_DENIED ERR_PERMISSION_DENIED
upvar #0 ERR_DIR_OR_FILE_NOT_EXIST ERR_DIR_OR_FILE_NOT_EXIST
send “$password\r”
expect {
#password not correct
“Permission denied， please try again.” {
exit $ERR_PERMISSION_DENIED
}
# 。..transmission goes after.。.
-re “Is a directory|No such file or directory” {
exit $ERR_DIR_OR_FILE_NOT_EXIST
}
-re “KB/s|MB/s” {
set timeout -1
expect eof
}
}
}
if {$argc！=2} {
send_user “usage： remote-exec command password\n”
send_user “ command should be quoted.\n”
send_user “ Eg. remote-exec \”ssh ls\\; echo done\“ password\n”
send_user “ or： remote-exec \”scp /local-file ：/remote-file\“ password\n”
exit $ERR_INVALID_ARGUMENT
}
set cmd ［lindex $argv 0］
set password ［lindex $argv 1］
eval spawn $cmd
#timeout in sec， default 10
set timeout 30
expect {
#first connect， no public key in ~/.ssh/known_hosts
“Are you sure you want to continue connecting （yes/no）？” {
send “yes\r”
expect “password：”
auth_trans $password
}
#already has public key in ~/.ssh/known_hosts
“password：” {
auth_trans $password
}
#user equivalence already established， no password is necessary
-re “kB/s|MB/s” {
set timeout -1
expect eof
}
-re “Is a directory|No such file or directory” {
expect eof
exit $ERR_DIR_OR_FILE_NOT_EXIST
}
“Connection refused” {
expect eof
exit $ERR_CONNECTION_REFUSED
}
#connetion error
timeout {
exit $ERR_TIMEOUT
}
}
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