Page 2 - How to remove null - termminate from a string?

Uh, system() requires the null. Removing it would mess everything up.

Are you trying to plunk the variable name into the string that you're passing to system? If so, then what do you think that you're trying to accomplish? Despite perl's C'ishness, C isn't perl -- you don't insert a variable's value simply by plopping it into a double-quoted string (BTW, single quotes vs double quotes is an entirely different kind of issue in C than in perl and shell scripting).

system() receives a single string. Period. If you need to insert variable values into that string, then you need to do that as you build the string before making the system call. For example:

or

@AnarCom: Your problem is that the command,
system ("mail email");
results in a command of mail email. In other words, the email variable is not expanded into the actual address. It's just the word, email.

Build your command, then pass it to system. Something like this:

You're correct, of course, dwise; that should have been strcpy followed by strcat.

No. Yours is an entirely different problem, and this is not your thread. Don't hijack other peoples threads, especially before they are concluded.

Well, thank you all for the help!

The following works for me:

I also understood the way system() works and the way strings are read.


Relax, I thought the problem was with the null. I wasn't borned with integrated C & UNIX white bible...

The only time you need, as far as I know, to remove the null terminator is in shellcoding. Getting rid of the 0x00 is a must.

Replacing it with an 'A' wont work, it really isn't that simple.

Then an explanation is in order. Starting with a description of what you mean by "shellcoding".

Actually, he's got it a little mixed up. A shellcode exploit that is designed to be introduced as a string must have no nulls other than at the end. Otherwise the injection would be terminated early. An instruction that carried a literal zero as an operand would be one example. Alternative instructions that create the zero would be required. That's about all I'm willing to say on the subject of shellcode in the forum. Script kiddies can hang in crackerz forums.

FYI, shellcoding is about as far from being a "script kiddie" as you can possibly get. Show me a script kiddie that can shellcode, and I'll give you my brand new Asus eee 900. Anyway........That was my 1 cent.

Coming from you clifford that's really rich - laughable infact.

Well I don't believe I have made irrelevant points, and if knowing what you are talking about, (or rather only talking about that which you know), is showing off in your opinion, so be it. In time your member rating/post ratio may indicate how much you impress.

Clifford is a REAL contributor. The number is small. You won't need more than two hands, I don't think, to count them. Perhaps you should get real. Get off the sugar-tit. Sheesh.