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nfqws: autottl cache, --dup-autottl, --orig-autottl

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bol-van
2025-05-03 12:01:49 +03:00
parent 5b625fa709
commit 5cc888cd2c
13 changed files with 501 additions and 111 deletions
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25
nfq/darkmagic.c
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@@ -1832,17 +1832,15 @@ bool rawsend_queue(struct rawpacket_tailhead *q)
}
// return guessed fake ttl value. 0 means unsuccessfull, should not perform autottl fooling
// ttl = TTL of incoming packet
uint8_t autottl_guess(uint8_t ttl, const autottl *attl)
uint8_t hop_count_guess(uint8_t ttl)
{
uint8_t orig, path, fake;
int d;
// 18.65.168.125 ( cloudfront ) 255
// 157.254.246.178 128
// 1.1.1.1 64
// guess original ttl. consider path lengths less than 32 hops
uint8_t orig;
if (ttl>223)
orig=255;
else if (ttl<128 && ttl>96)
@@ -1852,15 +1850,22 @@ uint8_t autottl_guess(uint8_t ttl, const autottl *attl)
else
return 0;
path = orig - ttl;
return orig - ttl;
}
// return guessed fake ttl value. 0 means unsuccessfull, should not perform autottl fooling
uint8_t autottl_eval(uint8_t hop_count, const autottl *attl)
{
uint8_t fake;
int d;
d = (int)path + attl->delta;
d = (int)hop_count + attl->delta;
if (d<attl->min) fake=attl->min;
else if (d>attl->max) fake=attl->max;
else fake=(uint8_t)d;
if (attl->delta<0 && fake>=path || attl->delta>=0 && fake<path)
return 0;
// path length check disabled
// if (attl->delta<0 && fake>=hop_count || attl->delta>=0 && fake<hop_count)
// return 0;
return fake;
}