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/*
* afp.c
*
* Copyright (C) 2009-11 by ipoque GmbH
* Copyright (C) 2011-22 - ntop.org
*
* This file is part of nDPI, an open source deep packet inspection
* library based on the OpenDPI and PACE technology by ipoque GmbH
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_AFP
#include "ndpi_api.h"
#include "ndpi_private.h"
struct afpHeader {
u_int8_t flags, command;
u_int16_t requestId;
u_int32_t dataOffset, length, reserved;
};
static void ndpi_int_afp_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_AFP, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_search_afp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
NDPI_LOG_DBG(ndpi_struct, "search AFP\n");
if (packet->payload_packet_len >= sizeof(struct afpHeader)) {
struct afpHeader *h = (struct afpHeader*)packet->payload;
if(packet->payload_packet_len > 128) {
/*
When we transfer a large data chunk, unless we have observed
the initial connection, we need to discard these packets
as they are not an indication that this flow is not AFP
*/
if(flow->packet_counter > 5)
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if((h->flags <= 1)
&& ((h->command >= 1) && (h->command <= 8))
&& (h->reserved == 0)
&& (packet->payload_packet_len >= (sizeof(struct afpHeader)+ntohl(h->length)))) {
NDPI_LOG_INFO(ndpi_struct, "found AFP: DSI\n");
ndpi_int_afp_add_connection(ndpi_struct, flow);
return;
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_afp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("AFP", ndpi_struct, *id,
NDPI_PROTOCOL_AFP,
ndpi_search_afp,
NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
SAVE_DETECTION_BITMASK_AS_UNKNOWN,
ADD_TO_DETECTION_BITMASK);
*id += 1;
}
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