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.

1 files changed, 0 insertions, 1 deletions

diff --git a/example/reader_util.h b/example/reader_util.h
index b8b249afe..6f8e8ba20 100644
--- a/example/reader_util.h
+++ b/example/reader_util.h
@@ -392,7 +392,6 @@ int ndpi_is_datalink_supported(int datalink_type);
 /* compare two nodes in workflow */
 int ndpi_workflow_node_cmp(const void *a, const void *b);
 void process_ndpi_collected_info(struct ndpi_workflow * workflow, struct ndpi_flow_info *flow);
-u_int32_t ethernet_crc32(const void* data, size_t n_bytes);
 void ndpi_flow_info_free_data(struct ndpi_flow_info *flow);
 void ndpi_flow_info_freer(void *node);
 const char* print_cipher_id(u_int32_t cipher);