SSH 期望脚本

Question

我有这个 Expect 脚本，它被另一个脚本调用来记录 Cisco 设备。由于某种原因，登录 Cisco 设备变得很慢。如何提高该脚本的速度？

#!/usr/bin/expect

log_user 0
set timeout 10
set userid  "id"
set password  "pass"

# ############## Get two arguments - (1) Device (2) Command to be executed
set device  [lindex $argv 0]
set command [lindex $argv 1]

spawn /usr/bin/ssh -l $userid $device

match_max [expr 32 * 1024]

expect {
    -re "RSA key fingerprint" {send "yes\r"}
    timeout {puts "Host is known"}
}

expect {
    -re "username: " {send "$userid\r"}
    -re "(P|p)assword: " {send "$password\r"}
    -re "Warning:" {send "$password\r"}
    -re "Connection refused" {puts "Host error -> $expect_out(buffer)";exit}
    -re "Connection closed"  {puts "Host error -> $expect_out(buffer)";exit}
    -re "no address.*" {puts "Host error -> $expect_out(buffer)";exit}
    timeout {puts "Timeout error. Is device down or unreachable?? ssh_expect";exit}
}

expect {
   -re "\[#>]$" {send "term len 0\r"}
  timeout {puts "Error reading prompt -> $expect_out(buffer)";exit}
}

expect {
   -re "\[#>]$" {send "$command\r"}
   timeout {puts "Error reading prompt -> $expect_out(buffer)";exit}
}

expect -re "\[#>]$"

set output $expect_out(buffer)
send "exit\r"
puts "$output\r\n"

Answer 1

将 exp_internal 1 添加到您的 Expect 脚本中。您将能够看到 Expect 如何匹配模式。我怀疑您的脚本恰好暂停 $timeout 秒，因为您的模式之一无法匹配。

Answer 2

我首先确保托管 SSH 守护进程的服务器或设备的熵运行不低，并且我会使用 Wireshark 或类似工具来分析流量，以查看连接的哪一端似乎正在等待另一端。