tinyshell | Copyright 2015 - TinyShell | Security Testing library
kandi X-RAY | tinyshell Summary
kandi X-RAY | tinyshell Summary
Copyright 2015 - TinyShell. Written by: Joe Veat. DISCLAIMER: This is only for testing purposes and can only be used where strict consent has been given. Do not use this for illegal purposes. Please read the LICENSE in LICENSE.md for the licensing information. TinyShell is a python command shell used to control and excute commands through HTTP requests to a webshell. TinyShell acts as the interface to the remote webshells. TinyShell is based on it's companion project SubShell (
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Top functions reviewed by kandi - BETA
- Remote command .
- Send command to remote server .
- Color a text string .
- Create a new download
- Initialize the command line interface .
- Signal handler .
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QUESTION
I am building a tiny shell in linux. After I run ls -la /tmp > output
, I can view the output by using cat
. If I try to rm
output, the removal succeeds but shows rm: cannot remove '': No such file or directory.
Here is my code
...ANSWER
Answered 2020-Mar-02 at 08:03The code is inconsistent:
- the number of elements in the array
myargs
is 1 plus the length of the first argument string, presumably the name of the command. This seems incorrect. - you assign
strlen(C.args[0])
string pointers from the arrayC.args[]
. Again, this seems incorrect and may have undefined behavior if this array is defined with fewer elements. - you attempt to set a
NULL
pointer terminator at the end of the array withmyargs[strlen(*C.args)+1] = NULL;
, but you actually set the element after the end of the array, which has undefined behavior.
You are playing with fire running the rm
command with potentially random arguments this way. You are lucky no useful file was removed before this bizarre diagnostic message, probably caused by an empty string argument at the end of the array.
As Keith Thomson commented, if you want to test a shell that might not work correctly, use something like echo
rather than rm
.
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