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Improved cloaking. It now uses an FNV hash, which makes IP's much more 

difficult to predict.
This commit is contained in:
Jacob Myers 2008-09-17 04:15:51 -04:00
parent 1596c1242e
commit 18395f4fa8
1 changed files with 2 additions and 29 deletions
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31
extensions/ip_cloaking.c
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@ -65,40 +65,13 @@ distribute_hostchange(struct Client *client)
ClearDynSpoof(client); ClearDynSpoof(client);
} }
#define Nval 0x8c3a48ac
#define HOSTLEN 63 #define HOSTLEN 63
#define INITDATA "98fwqefnoiqefv03f423t34gbv3vb89tg432t3b8" /* change this */
static inline unsigned int
get_string_entropy(const char *inbuf)
{
unsigned int accum = 1;
while(*inbuf != '\0')
accum += *inbuf++;
return accum;
}
/* calls get_string_entropy() and toasts it against INITDATA */
static inline unsigned int
get_string_weighted_entropy(const char *inbuf)
{
static int base_entropy = 0;
unsigned int accum = get_string_entropy(inbuf);
/* initialize the algorithm if it is not yet ready */
if (base_entropy == 0)
base_entropy = get_string_entropy(INITDATA);
return (Nval * accum) ^ base_entropy;
}
static void static void
do_host_cloak_ip(const char *inbuf, char *outbuf) do_host_cloak_ip(const char *inbuf, char *outbuf)
{ {
char *tptr; char *tptr;
unsigned int accum = get_string_weighted_entropy(inbuf); unsigned int accum = fnv_hash(inbuf, 32);
char buf[HOSTLEN]; char buf[HOSTLEN];
int ipv6 = 0; int ipv6 = 0;
@ -134,7 +107,7 @@ do_host_cloak_host(const char *inbuf, char *outbuf)
{ {
char b26_alphabet[] = "abcdefghijklmnopqrstuvwxyz"; char b26_alphabet[] = "abcdefghijklmnopqrstuvwxyz";
char *tptr; char *tptr;
unsigned int accum = get_string_weighted_entropy(inbuf); unsigned int accum = fnv_hash(inbuf, 32);
strncpy(outbuf, inbuf, HOSTLEN); strncpy(outbuf, inbuf, HOSTLEN);