Bash 和期望：无法通过 telnet 重新启动路由器

Question

我正在尝试通过expect 通过telnet 连接到D-Link 路由器来重新启动它。 问题是我无法执行（通过期望脚本）路由器支持的任何命令。

首先，我用我的路由器向你展示一个简短的 telnet 会话：

telnet 192.168.1.1
Trying 192.168.1.1...
Connected to 192.168.1.1.
Escape character is '^]'.
BCM96338 ADSL Router
Login: admin
Password: 
> swversion show
EU_3-12-01-1R00.A2pB026.d20m
> logout

Bye bye. Have a nice day!!!
Connection closed by foreign host.

现在我正在尝试使用 Expect 脚本使其自动运行，但无法使其正常工作。这是脚本：

#!/usr/bin/expect -f

#exp_internal 1
set timeout 30

#router username
set name admin

#command to execute
set routercmd "swversion show"

#router password
set pass mypassword

#router IP address
set routerip 192.168.1.1

spawn telnet $routerip
# send username & password
expect "Login: "
send "$name\r"
expect "Password: "
send "$pass\r"
expect "> "
send "$routercmd\r"
expect "> "

当我执行脚本时，它卡在密码提示符处：

./reboot_dut.sh 
spawn telnet 192.168.1.1
Trying 192.168.1.1...
Connected to 192.168.1.1.
Escape character is '^]'.
BCM96338 ADSL Router
Login: admin
Password: 

如果我取消注释 #exp_internal 1 行，我会得到：

./reboot_dut.sh 
spawn telnet 192.168.1.1
parent: waiting for sync byte
parent: telling child to go ahead
parent: now unsynchronized from child
spawn: returns {6398}

expect: does "" (spawn_id exp7) match glob pattern "Login: "? no
Trying 192.168.1.1...
expect: does "Trying 192.168.1.1..." (spawn_id exp7) match glob pattern "Login: "? no


expect: does "Trying 192.168.1.1...\r\n" (spawn_id exp7) match glob pattern "Login: "? no
Connected to 192.168.1.1.
expect: does "Trying 192.168.1.1...\r\nConnected to 192.168.1.1." (spawn_id exp7) match glob pattern "Login: "? no


expect: does "Trying 192.168.1.1...\r\nConnected to 192.168.1.1.\r\n" (spawn_id exp7) match glob pattern "Login: "? no
Escape character is '^]'.
expect: does "Trying 192.168.1.1...\r\nConnected to 192.168.1.1.\r\nEscape character is '^]'." (spawn_id exp7) match glob pattern "Login: "? no


expect: does "Trying 192.168.1.1...\r\nConnected to 192.168.1.1.\r\nEscape character is '^]'.\r\n" (spawn_id exp7) match glob pattern "Login: "? no
BCM96338 ADSL Router

expect: does "Trying 192.168.1.1...\r\nConnected to 192.168.1.1.\r\nEscape character is '^]'.\r\nBCM96338 ADSL Router\r\n" (spawn_id exp7) match glob pattern "Login: "? no
Login: 
expect: does "Trying 192.168.1.1...\r\nConnected to 192.168.1.1.\r\nEscape character is '^]'.\r\nBCM96338 ADSL Router\r\nLogin: " (spawn_id exp7) match glob pattern "Login: "? yes
expect: set expect_out(0,string) "Login: "
expect: set expect_out(spawn_id) "exp7"
expect: set expect_out(buffer) "Trying 192.168.1.1...\r\nConnected to 192.168.1.1.\r\nEscape character is '^]'.\r\nBCM96338 ADSL Router\r\nLogin: "
send: sending "admin\r" to { exp7 }

expect: does "" (spawn_id exp7) match glob pattern "Password: "? no
a
expect: does "a" (spawn_id exp7) match glob pattern "Password: "? no
dmin
Password: 
expect: does "admin\r\nPassword: " (spawn_id exp7) match glob pattern "Password: "? yes
expect: set expect_out(0,string) "Password: "
expect: set expect_out(spawn_id) "exp7"
expect: set expect_out(buffer) "admin\r\nPassword: "
send: sending "mypassword\r" to { exp7 }

expect: does "" (spawn_id exp7) match glob pattern "> "? no
expect: timed out
send: sending "swversion show\r" to { exp7 }

expect: does "" (spawn_id exp7) match glob pattern "> "? no

> swversion show

expect: does "\r\n> swversion show\r\n" (spawn_id exp7) match glob pattern "> "? yes
expect: set expect_out(0,string) "> "
expect: set expect_out(spawn_id) "exp7"
expect: set expect_out(buffer) "\r\n> "

Answer 1

我想说您需要将提示符与“>”相匹配，而不是“>”（即后面没有空格）。

Answer 2

解决方案：我找到了问题的解决方案。我试图重新启动的路由器是 D-LINK 2640B。此路由器的工作期望脚本是：

#!/usr/bin/expect -f

spawn telnet ROUTER_IP
match_max 10000
expect *login:*
sleep 2
send -- "USERNAME\r"
expect *assword:*
sleep 2
send -- "PASSWORD\r"
expect *>*
send -- "\r"
expect *>*
send -- "COMMAND\r"
expect *>*
send -- "\r"
expect *>*
send -- "logout\r"