预期脚本错误发送：Spawn id exp4 not open while execution

Question

我正在尝试运行此脚本，但修改时出现不同的错误。这是代码和输出。请帮忙。

在文章末尾更新调试信息

    #!/bin/bash
    (( $# != 1 )) && { echo >&2 "Usage: $0 \"[COMMAND]\""; exit 1; }
    servers_addresses=(10.10.10.10 )
    for server_address in ${servers_addresses[@]}; do
    expect <<EOF
    spawn ssh -t root@$server_address "$*"
    expect -timeout 2 "Are you sure you want to continue connecting (yes/no)?" { send "yes\n" }
    expect "s password:" { send "Correct_Password\n" }
    expect "s password:" { send "Wrong_Password_22222\n" }
    expect "s password:" { send "Wrong_Password_33333\n" }
    expect eof
    EOF
    done

输出如下：

    goldberg188@Test-Server ~$ ./test.sh "sudo cat /etc/hosts"
    spawn ssh -t root@10.10.10.10 sudo cat /etc/hosts
    root@10.10.10.10's password:
    # Do not remove the following line, or various programs
    # that require network functionality will fail.
    10.10.10.10             TEST-004 localhost.localdomain localhost
    ::1             localhost6.localdomain6 localhost6
    Connection to 10.10.10.10 closed.
    expect: spawn id exp4 not open
        while executing
    "expect "s password:" { send "Wrong_Password_33333\n" }"

如果我这样修改，那么输出会有点不同

    expect "s password:" { send "Wrong_Password_11111\n" }
    expect "s password:" { send "Correct_Password\n" }
    expect "s password:" { send "Wrong_Password_33333\n" }

    goldberg188@Test-Server ~$ ./test.sh "sudo cat /etc/hosts"
    spawn ssh -t root@10.10.10.10 sudo cat /etc/hosts
    root@10.10.10.10's password:
    # Do not remove the following line, or various programs
    # that require network functionality will fail.
    10.10.10.10             TEST-004 localhost.localdomain localhost
    ::1             localhost6.localdomain6 localhost6
    Connection to 10.10.10.10 closed.
    expect: spawn id exp4 not open
        while executing
    "expect eof"

如果第三行的密码正确，则完全没有错误。在这个上工作得很好。

    expect "s password:" { send "Wrong_Password_11111\n" }
    expect "s password:" { send "Wrong_Password_22222\n" }
    expect "s password:" { send "Correct_Password\n" }


    goldberg188@Test-Server ~$ ./test.sh "sudo cat /etc/hosts"
    spawn ssh -t root@10.10.10.10 sudo cat /etc/hosts
    root@10.10.10.10's password:
    # Do not remove the following line, or various programs
    # that require network functionality will fail.
    10.10.10.10             TEST-004 localhost.localdomain localhost
    ::1             localhost6.localdomain6 localhost6
    Connection to 10.10.10.10 closed.

更新：调试信息 - 修改为

    exp_internal 1
    expect "s password:" { send "Wrong_Password_11111\n" }
    expect "s password:" { send "Correct_Password\n" }
    expect "s password:" { send "Wrong_Password_33333\n" }

输出：

    goldberg188@Test-Server ~$ ./test.sh "sudo cat /etc/host"
    spawn ssh -t root@10.10.10.10 sudo cat /etc/host
    root@10.10.10.10's password:
    expect: does "root@10.10.10.10's password: " (spawn_id exp4) match glob pattern "s password:"? yes
    expect: set expect_out(0,string) "s password:"
    expect: set expect_out(spawn_id) "exp4"
    expect: set expect_out(buffer) "root@10.10.10.10's password:"
    send: sending "Wrong_Password_11111\n" to { exp4 }

    expect: does " " (spawn_id exp4) match glob pattern "s password:"? no


    expect: does " \r\n" (spawn_id exp4) match glob pattern "s password:"? no
    Permission denied, please try again.
    root@10.10.10.10's password:
    expect: does " \r\nPermission denied, please try again.\r\r\nroot@10.10.10.10's password: " (spawn_id exp4) match glob pattern "s password:"? yes
    expect: set expect_out(0,string) "s password:"
    expect: set expect_out(spawn_id) "exp4"
    expect: set expect_out(buffer) " \r\nPermission denied, please try again.\r\r\nroot@10.10.10.10's password:"
    send: sending "Correct_Password\n" to { exp4 }

    expect: does " " (spawn_id exp4) match glob pattern "s password:"? no


    expect: does " \r\n" (spawn_id exp4) match glob pattern "s password:"? no
    cat: /etc/host: No such file or directory
    Connection to 10.10.10.10 closed.

    expect: does " \r\ncat: /etc/host: No such file or directory\r\r\nConnection to 10.10.10.10 closed.\r\r\n" (spawn_id exp4) match glob pattern "s password:"? no
    expect: read eof
    expect: set expect_out(spawn_id) "exp4"
    expect: set expect_out(buffer) " \r\ncat: /etc/host: No such file or directory\r\r\nConnection to 10.10.10.10 closed.\r\r\n"
    expect: spawn id exp4 not open
        while executing
    "expect eof"

Answer 1

根据您的代码，ssh 连接似乎在向 ssh 会话提供密码的几条线索后关闭。

每当使用spawn 命令生成新进程时，expect 就会将该期望进程的spawn_id 保存到expect_out(spawn_id) 中。

根据你的代码，expect的spawn_id是在遇到时生成的

        spawn ssh -t root@$server_address "$*"  

你看到的调试如下。

 spawn ssh -t root@10.10.10.10 sudo cat /etc/host
    root@10.10.10.10's password:
    expect: does "root@10.10.10.10's password: " (spawn_id exp4) match glob pattern "s password:"? yes
    expect: set expect_out(0,string) "s password:"
    expect: set expect_out(spawn_id) "exp4"

正如您在调试信息中看到的那样，expect_out(spawn_id) 包含 spawn_id，在您的情况下它必须期望值是 exp4。

如您所见，连接在几次错误路径后关闭，从而使进程exp4 不再在上下文中退出。由于spawn_id 持有相同的引用，expect 将尝试从该进程中期待并失败。

您可以参考this 问题以了解此spawn_id 如何与标准输入（从控制台读取输入）一起使用

Answer 2

在我得到一些信息后，这个问题得到了解决 https://serverfault.com/questions/642129/expect-script-error-send-spawn-id-exp4-not-open-while-executing

感谢https://serverfault.com/users/30957/glenn-jackman