<![CDATA[#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <stdio.h>
#include <sys/time.h>
#include <time.h>
void usr1() {
}
int main(int argc, char ** argv) {
int nbfils;
int nbopen;
int tbloc;
int tfichier;
char filename[512];
int i, j, k, f;
int pid;
struct timeval start;
struct timeval end;
float delay;
void * bloc;
if (argc<6) {
fprintf(stderr, "Syntax: %s rep_nfs/ nb_child nb_open sizefile(Kb) blocksize(kb).\n", argv[0]);
fprintf(stderr, "ie: %s /TEST/ 120 200 20000 100\n");
exit(EXIT_FAILURE);
}
nbfils = atoi(argv[2]);
nbopen = atoi(argv[3]);
tfichier = atoi(argv[4]);
tbloc = atoi(argv[5]);
bloc = malloc(tbloc * 1024);
memset(bloc, 0, tbloc * 1024);
if (!bloc) {
fprintf(stderr, "%s: ", argv[0]);
perror("malloc");
exit(-1);
}
fprintf(stderr, "forking %d times...\n", nbfils);
signal(SIGUSR1, &usr1);
j = 0;
for(i=0;i<nbfils;i++) {
pid = fork();
if (pid<0) {
perror("fork");
break;
} else
j++;
if (!pid) break;
}
if (!pid) {
pause();
pid = getpid();
srand(pid*10);
fprintf(stderr, "[%d] child %d: Here I go!\n", pid, i);
sprintf(filename, "%s%d", argv[1], pid);
for(i=0;i<nbopen;i++) {
f = open(filename, O_CREAT|O_RDWR, 0666);
if (f<0) {
fprintf(stderr, "[%d] file %s ", pid, filename);
perror("open");
break;
}
k = (rand() % (tfichier * 1024));
j = lseek(f, k, SEEK_SET);
if (j!=k) {
fprintf(stderr, "[%d] ", pid);
perror("lseek");
break;
}
// read(f, bloc, tbloc*1024);
if (write(f, bloc, tbloc*1024)!=tbloc*1024) {
fprintf(stderr, "[%d] ", pid);
perror("write");
break;
}
sync();
if (close(f)) {
fprintf(stderr, "[%d] ", pid);
perror("close");
break;
}
}
exit(0);
}
sleep(2);
gettimeofday(&start, NULL);
kill(0, SIGUSR1);
i = 0;
while (i<nbfils)
if (waitpid(-1, NULL, 0)>0)
i++;
fprintf(stderr, "they're all dead now, exiting.\nYour system is not vulnerable\n");
gettimeofday(&end, NULL);
delay = end.tv_sec - start.tv_sec + ((float) (end.tv_usec - start.tv_usec))
/ (float) 1000000;
i = nbopen * tbloc * nbfils;
exit(0);
}
]]>