static size_t p0f2str(char *buf, size_t len, const tcp *t, size_t tcplen, const ipv4 *ip, size_t iplen, int mss_star)
{
size_t bytes = 0;
p0f_fingerprint p;
if (build_p0f_fingerprint(t, tcplen, ip, iplen, &p)) {
char winbuf[16],
optbuf[256],
quirkbuf[16];
u16 mtu = p.mss + 40;
if (p.mss && 0 == p.win.size % p.mss) {
snprintf(winbuf, sizeof winbuf, "S%u", p.win.size / p.mss);
} else if (mtu > 40 && 0 == p.win.size % mtu) {
snprintf(winbuf, sizeof winbuf, "T%u", p.win.size / mtu);
} else {
snprintf(winbuf, sizeof winbuf, "%u", p.win.size);
}
opt2str(optbuf, sizeof optbuf, &p, mss_star);
quirk2str(quirkbuf, sizeof quirkbuf, &p);
bytes = snprintf(buf, len, "%s:%u:%u:%u:%s:%s",
winbuf, p.ttl, p.df, p.synsize, optbuf, quirkbuf);
} else {
*buf = '\0';
}
printf("TCP.SYN.Fingerprint(%u)=%s\n", (unsigned)bytes, buf);
return bytes;
}
/* option to string -------------------------------------------------------------
* convert option to string (keyword=value # comment)
* args : opt_t *opt I option
* char *buff O option string
* return : length of output string
*-----------------------------------------------------------------------------*/
extern int opt2buf(const opt_t *opt, char *buff)
{
char *p=buff;
int n;
trace(3,"opt2buf : name=%s\n",opt->name);
p+=sprintf(p,"%-18s =",opt->name);
p+=opt2str(opt,p);
if (*opt->comment) {
if ((n=(int)(buff+30-p))>0) p+=sprintf(p,"%*s",n,"");
p+=sprintf(p," # (%s)",opt->comment);
}
return (int)(p-buff);
}
