Setup Environment Shell EGG

setup_env.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

/*
 * Setup an ENV EGG with /bin/sh, and find a
 * a estimate of where this is located in memory
 *
 * Compiled with gcc -o setup setup_env.c
 *
 * # gcc -o setup setup_env.c 
 * # ./setup 
 * Setting up environment...
 * Estimated address of EGG: 0x804a0a4
 */

int get_env(void)
{

	char *ptr = getenv("EGG");

	if (ptr != NULL) {

		printf("Estimated address of EGG: %p\n", ptr);
		return 0;

	} else {

		printf("Can't find EGG in env\n");
		return 1;
	}
}

int main( int argc, char **argv )
{

	printf("Setting up environment...\n");
	setenv("EGG", "/bin/sh", 1);

	get_env();
	/*execl("/bin/sh", (char *)NULL);*/
}