From b51a2ac72a3cbd1b470890d0151a46da28e6754e Mon Sep 17 00:00:00 2001
From: Ivan Nardi <12729895+IvanNardi@users.noreply.github.com>
Date: Thu, 9 Feb 2023 20:02:12 +0100
Subject: fuzz: some improvements and add two new fuzzers (#1881)

Remove `FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION` define from
`fuzz/Makefile.am`; it is already included by the main configure script
(when fuzzing).

Add a knob to force disabling of AESNI optimizations: this way we can
fuzz also no-aesni crypto code.

Move CRC32 algorithm into the library.

Add some fake traces to extend fuzzing coverage. Note that these traces
are hand-made (via scapy/curl) and must not be used as "proof" that the
dissectors are really able to identify this kind of traffic.

Some small updates to some dissectors:

CSGO: remove a wrong rule (never triggered, BTW). Any UDP packet starting
with "VS01" will be classified as STEAM (see steam.c around line 111).
Googling it, it seems right so.

XBOX: XBOX only analyses UDP flows while HTTP only TCP ones; therefore
that condition is false.

RTP, STUN: removed useless "break"s

Zattoo: `flow->zattoo_stage` is never set to any values greater or equal
to 5, so these checks are never true.

PPStream: `flow->l4.udp.ppstream_stage` is never read. Delete it.

TeamSpeak: we check for `flow->packet_counter == 3` just above, so the
following check `flow->packet_counter >= 3` is always false.
---
 src/include/ndpi_api.h | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/include/ndpi_api.h')

diff --git a/src/include/ndpi_api.h b/src/include/ndpi_api.h
index 9968e9eb3..3abe2080d 100644
--- a/src/include/ndpi_api.h
+++ b/src/include/ndpi_api.h
@@ -1713,6 +1713,10 @@ extern "C" {
 
   /* ******************************* */
 
+  u_int32_t ndpi_crc32(const void* data, size_t n_bytes);
+
+  /* ******************************* */
+
   int ndpi_des_init(struct ndpi_des_struct *des, double alpha, double beta, float significance);
   int ndpi_des_add_value(struct ndpi_des_struct *des, const double _value, double *forecast, double *confidence_band);
   void ndpi_des_fitting(double *values, u_int32_t num_values, float *ret_alpha, float *ret_beta);
-- 
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