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Telnet BASH 脚本 - 某些命令在 telnet 会话中运行

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Telnet BASH 脚本 - 某些命令在 telnet 会话中运行

我正在运行 bash 脚本以便从客户端获取一些数据。那是脚本：

host=2.218.71.67
port=23
login=xxx
passwd=xxx
DATE=date
cmd1=ps
cmd2=dumpmdm
cmd3=sh
cmd4=`cat /proc/meminfo`
cmd5=`cat /proc/slabinfo`
cmd6=`cat /proc/modules`
cmd7=ifconfig
cmd8=`brctl show`
cmd9=`route -n`
cmd10=`cat /proc/net/arp`
cmd11=`cat /proc/net/nf_conntrack`
cmd12=`wlanconfig ath0 list`
cmd13=`wlanconfig ath0 list ap`
cmd14=top 

$DATE
(
 echo open ${host}
sleep 3
echo ${login}
sleep 1
echo ${passwd}
sleep 1
echo ${cmd1}
sleep 1
echo ${cmd2}
sleep 3
echo ${cmd3}
sleep 1
echo ${cmd4}
sleep 1
echo ${cmd5}
sleep 1
echo ${cmd6}
sleep 1
echo ${cmd7}
sleep 1
echo ${cmd8}
sleep 1
echo ${cmd9}
sleep 1
echo ${cmd10}
sleep 1
echo ${cmd11}
sleep 2
echo ${cmd12}
sleep 1
echo ${cmd13}
sleep 1
echo ${cmd14}
sleep 2
) | telnet
$DATE

当我运行脚本时，似乎有些命令是在 telnet 会话之外运行的

root@raspberrypi:/etc/my_scripts# ./telnet.sh
cat: /proc/net/nf_conntrack: No such file or directory
./telnet.sh: line 27: wlanconfig: command not found
./telnet.sh: line 28: wlanconfig: command not found
Wed Nov 25 12:57:20 GMT 2015
telnet> Trying 2.218.71.67...
Connected to 2.218.71.67.
Escape character is '^]'.
BCM96348 xDSL Router
Login: ^C

root@raspberrypi:/etc/my_scripts# bash -x telnet.sh
+ host=2.218.71.67
+ port=23
+ login=admin
+ passwd=Sky.2015
+ DATE=date
+ cmd1=ps
+ cmd2=dumpmdm
+ cmd3=sh
++ cat /proc/meminfo
+ cmd4='MemTotal:         445032 kB
MemFree:           25696 kB
MemAvailable:     328996 kB
Buffers:           16848 kB
Cached:           233056 kB
SwapCached:            4 kB
Active:           147000 kB
Inactive:         169248 kB
Active(anon):      21840 kB
Inactive(anon):    44848 kB
Active(file):     125160 kB
Inactive(file):   124400 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:        102396 kB
SwapFree:         102392 kB
Dirty:                32 kB
Writeback:             0 kB
AnonPages:         66356 kB
Mapped:             8048 kB
Shmem:               344 kB
Slab:              89504 kB
SReclaimable:      84460 kB
SUnreclaim:         5044 kB
KernelStack:         952 kB
PageTables:         1700 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:      324912 kB
Committed_AS:     517536 kB
VmallocTotal:     565248 kB
VmallocUsed:        1076 kB
VmallocChunk:     325400 kB
CmaTotal:           8192 kB
CmaFree:              24 kB'
++ cat /proc/slabinfo
+ cmd5='slabinfo - version: 2.1
# name            <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail>
UDPLITEv6              0      0    768   10    2 : tunables    0    0    0 : slabdata      0      0      0
UDPv6                 10     10    7

有什么建议吗？

答案1

对于远程作业，请查看 nc 或 Expect。 nc 用于更简单的工作，并期望更复杂的交互交互。 nc 要简单得多，您可以确定没有控制命令发送到远程系统。

从安全角度来看，通过网络使用 telnet 也不是最好的主意，更不用说通过互联网了，因为内容以明文形式传输并且很容易捕获。

我强烈建议使用expect 通过 ssh 进行对话。

来自文章：

http://www.admin-magazine.com/Articles/Automating-with-Expect-Scripts

#!/usr/bin/expect -f
spawn ssh aspen
expect "password: "
send "PASSWORD\r"
expect "$ "
send "ps -ef |grep apache\r"
expect "$ "
send "exit\r"

答案2

为了回答您的确切问题，以下命令使用反引号：

cmd4=`cat /proc/meminfo`
cmd5=`cat /proc/slabinfo`
cmd6=`cat /proc/modules`

因此，它们设置为在运行脚本的主机上完成分配时打印cmd4的值，而不是您通过 telnet 进入的主机。cat /proc/meminfo你可能想要这个：

cmd4='cat /proc/meminfo'
cmd5='cat /proc/slabinfo'
cmd6='cat /proc/modules'

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