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/*
* zmq.c
*
* Copyright (C) 2011-15 - ntop.org
*
* nDPI is free software: you can zmqtribute 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_api.h"
#ifdef NDPI_PROTOCOL_ZMQ
static void ndpi_int_zmq_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ZMQ, NDPI_PROTOCOL_UNKNOWN);
NDPI_LOG(NDPI_PROTOCOL_ZMQ, ndpi_struct, NDPI_LOG_TRACE, "ZMQ Found.\n");
}
static void ndpi_check_zmq(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &flow->packet;
u_int32_t payload_len = packet->payload_packet_len;
u_char p0[] = { 0x00, 0x00, 0x00, 0x05, 0x01, 0x66, 0x6c, 0x6f, 0x77 };
u_char p1[] = { 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x7f };
u_char p2[] = { 0x28, 0x66, 0x6c, 0x6f, 0x77, 0x00 };
if(payload_len == 0) return; /* Shouldn't happen */
/* Break after 17 packets. */
if(flow->packet_counter > 17) {
NDPI_LOG(NDPI_PROTOCOL_ZMQ, ndpi_struct, NDPI_LOG_TRACE, "Exclude ZMQ.\n");
NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_ZMQ);
return;
}
if(flow->l4.tcp.prev_zmq_pkt_len == 0) {
flow->l4.tcp.prev_zmq_pkt_len = ndpi_min(packet->payload_packet_len, 10);
memcpy(flow->l4.tcp.prev_zmq_pkt, packet->payload, flow->l4.tcp.prev_zmq_pkt_len);
return; /* Too early */
}
if(payload_len == 2) {
if(flow->l4.tcp.prev_zmq_pkt_len == 2) {
if((memcmp(packet->payload, "\01\01", 2) == 0)
&& (memcmp(flow->l4.tcp.prev_zmq_pkt, "\01\02", 2) == 0)) {
ndpi_int_zmq_add_connection(ndpi_struct, flow);
return;
}
} else if(flow->l4.tcp.prev_zmq_pkt_len == 9) {
if((memcmp(packet->payload, "\00\00", 2) == 0)
&& (memcmp(flow->l4.tcp.prev_zmq_pkt, p0, 9) == 0)) {
ndpi_int_zmq_add_connection(ndpi_struct, flow);
return;
}
} else if(flow->l4.tcp.prev_zmq_pkt_len == 10) {
if((memcmp(packet->payload, "\01\02", 2) == 0)
&& (memcmp(flow->l4.tcp.prev_zmq_pkt, p1, 10) == 0)) {
ndpi_int_zmq_add_connection(ndpi_struct, flow);
return;
}
}
} else if(payload_len >= 10) {
if(flow->l4.tcp.prev_zmq_pkt_len == 10) {
if(((memcmp(packet->payload, p1, 10) == 0)
&& (memcmp(flow->l4.tcp.prev_zmq_pkt, p1, 10) == 0))
|| ((memcmp(&packet->payload[1], p2, sizeof(p2)) == 0)
&& (memcmp(&flow->l4.tcp.prev_zmq_pkt[1], p2, sizeof(p2)) == 0))) {
ndpi_int_zmq_add_connection(ndpi_struct, flow);
return;
}
}
}
}
void ndpi_search_zmq(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &flow->packet;
NDPI_LOG(NDPI_PROTOCOL_ZMQ, ndpi_struct, NDPI_LOG_TRACE, "ZMQ detection...\n");
/* skip marked packets */
if (packet->detected_protocol_stack[0] != NDPI_PROTOCOL_ZMQ) {
if (packet->tcp_retransmission == 0) {
ndpi_check_zmq(ndpi_struct, flow);
}
}
}
#endif
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