buffer_overflow_exploit/program.c at master · glenlcathey/buffer_overflow_exploit · GitHub

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#include <stdio.h>
#include <string.h>

void secretFunction()
{
    printf("Congratulations!\n");
    printf("You have entered in the secret function!\n");
}

void FileCompress()
{
    	char buffer[20];
	char exists[28] = "test -f ";
	char zip[25] = "gzip ";
	char cp[45] = "cp ";
	char mv[45] = "mv ";
	int status;


    	printf("Enter file name to compress:\n");
    	gets(buffer);

	strcat(exists, buffer);
	status = system(exists);
	if (status == 256) {
		printf("%s", "File not found, exiting");
		return;
	}

	strcat(cp, buffer);
	strcat(cp, " ");
	strcat(cp, buffer);
	strcat(cp, "1");
	system(cp);

	strcat(zip, buffer);
	status = system(zip);
	if (status == 256) {
		printf("%s", "Gzip failed, exiting");
		return;
	}
	else {
		printf("%s has been zipped. \n", buffer);
	}

	strcat(mv, buffer);
	strcat(mv, "1");
	strcat(mv, " ");
	strcat(mv, buffer);
	system(mv);

	return;
}

int main()
{
    FileCompress();

    return 0;
}