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/*
* skinny.c
*
* Copyright (C) 2013 Remy Mudingay <mudingay@ill.fr>
*
* This module 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.
*
* This module 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.
* If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "ndpi_protocol_ids.h"
#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_SKINNY
#include "ndpi_api.h"
#include "ndpi_private.h"
/* Reference: Wiresahrk: epan/dissectors/packet-skinny.c */
static void ndpi_int_skinny_add_connection(struct ndpi_detection_module_struct
*ndpi_struct, struct ndpi_flow_struct *flow)
{
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_SKINNY, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static int is_valid_version(u_int32_t version)
{
if(version == 0x00 || /* Basic msg type */
version == 0x0A || /* V10 */
version == 0x0B || /* V11 */
version == 0x0F || /* V15 */
version == 0x10 || /* V16 */
version == 0x11 || /* V17 */
version == 0x12 || /* V18 */
version == 0x13 || /* V19 */
version == 0x14 || /* V20 */
version == 0x15 || /* V21 */
version == 0x16) /* V22 */
return 1;
return 0;
}
static int is_valid_opcode(u_int32_t opcode)
{
/* A loose check */
if(opcode <= 0x009F ||
(opcode >= 0x0100 && opcode <= 0x0160) ||
(opcode == 0x8000) ||
(opcode >= 0x8100 && opcode <= 0x8101))
return 1;
return 0;
}
static void ndpi_search_skinny(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
u_int16_t dport, sport;
NDPI_LOG_DBG(ndpi_struct, "search for SKINNY\n");
if(packet->tcp != NULL) {
sport = ntohs(packet->tcp->source), dport = ntohs(packet->tcp->dest);
NDPI_LOG_DBG2(ndpi_struct, "calculating SKINNY over tcp\n");
if((dport == 2000 || sport == 2000) &&
(packet->payload_packet_len >= 12)) {
u_int32_t data_length, version, opcode;
data_length = le32toh(get_u_int32_t(packet->payload, 0));
version = le32toh(get_u_int32_t(packet->payload, 4));
opcode = le32toh(get_u_int32_t(packet->payload, 8));
if(data_length + 8 == packet->payload_packet_len &&
is_valid_version(version) &&
is_valid_opcode(opcode)) {
NDPI_LOG_INFO(ndpi_struct, "found skinny\n");
ndpi_int_skinny_add_connection(ndpi_struct, flow);
return;
}
}
}
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
void init_skinny_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id)
{
ndpi_set_bitmask_protocol_detection("CiscoSkinny", ndpi_struct, *id,
NDPI_PROTOCOL_SKINNY,
ndpi_search_skinny,
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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