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.
---
 tests/do.sh.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'tests/do.sh.in')

diff --git a/tests/do.sh.in b/tests/do.sh.in
index 62823b2bd..94d2b3fc0 100755
--- a/tests/do.sh.in
+++ b/tests/do.sh.in
@@ -56,7 +56,7 @@ fuzzy_testing() {
 	cp ../example/risky_domains.txt .
 	cp ../example/ja3_fingerprints.csv .
 	cp ../example/sha1_fingerprints.csv .
-	../fuzz/fuzz_ndpi_reader -dict=..fuzz/dictionary.dict -max_total_time="${MAX_TOTAL_TIME:-592}" -print_pcs=1 -workers="${FUZZY_WORKERS:-0}" -jobs="${FUZZY_JOBS:-0}" pcap/
+	../fuzz/fuzz_ndpi_reader -dict=../fuzz/dictionary.dict -max_total_time="${MAX_TOTAL_TIME:-592}" -print_pcs=1 -workers="${FUZZY_WORKERS:-0}" -jobs="${FUZZY_JOBS:-0}" pcap/
 	rm -f protos.txt categories.txt risky_domains.txt ja3_fingerprints.csv sha1_fingerprints.csv
     fi
 }
-- 
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