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-   -   how to get root privilage (https://www.linuxquestions.org/questions/programming-9/how-to-get-root-privilage-357712/)

skie_knite007 08-28-2005 02:49 AM
how to get root privilage
 
I'm creating an appilcation in C which requires root privilage.....How can I invoke root privilage amidst the execution..I mean I can ask the user to enter the root passwd, but how I can substitute the user with root using C once I got the passwd.???????????

zeropash 08-28-2005 04:41 AM
do you want to elevate the privileges while executing or at the begining itself?
if its at the begining of the execution you can check the documentation for
sudo, chmod +s ,
or if you are in a graphical environment check out kdesu or gnomesu

skie_knite007 08-28-2005 07:11 AM
But I need it while executing

dub.wav 08-28-2005 10:19 AM
Code:
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#define UID_ROOT 0

int main(int argc, char *argv[]) {
    if (geteuid() != UID_ROOT) {
        execlp("su", "su", "-c", argv[0], NULL);
    }
    puts("root");
    return 0;
}
If you need to pass more arguments, RTFM.

btmiller 08-28-2005 10:30 AM
And to add on, you should really check user input very carefully before you do something with it as root. Otherwise you wilkl compromise your system's security.


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