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Tiny gnutella improvement if gtk-gnutella used. #1525

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Apr 22, 2022
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Tiny gnutella improvement if gtk-gnutella used. #1525

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14 changes: 14 additions & 0 deletions src/lib/protocols/gnutella.c
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Original file line number Diff line number Diff line change
Expand Up @@ -185,6 +185,20 @@ void ndpi_search_gnutella(struct ndpi_detection_module_struct *ndpi_struct, stru
}
}
} else if (packet->udp != NULL) {
/* Check for Mojito-DHT encapsulated gnutella (gtk-gnutella). */
if (packet->payload_packet_len >= 28 &&
ntohl(get_u_int32_t(packet->payload, 24)) == 0x47544b47 /* GTKG */)
{
u_int32_t gnutella_payload_len = le32toh(get_u_int32_t(packet->payload, 19));

if (gnutella_payload_len == (u_int32_t)packet->payload_packet_len - 23)
{
NDPI_LOG_DBG2(ndpi_struct, "detected mojito-dht/gnutella udp\n");
ndpi_int_gnutella_add_connection(ndpi_struct, flow, NDPI_CONFIDENCE_DPI);
return;
}
}

/* observations:
* all the following patterns send out many packets which are the only ones of their flows,
* often on the very beginning of the traces, or flows with many packets in one direction only.
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