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/*
* redis.c
*
* Copyright (C) 2011-22 - ntop.org
*
* 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_REDIS
#include "ndpi_api.h"
static void ndpi_int_redis_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_REDIS, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
}
static void ndpi_check_redis(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
struct ndpi_packet_struct *packet = &ndpi_struct->packet;
u_int32_t payload_len = packet->payload_packet_len;
if(payload_len == 0) return; /* Shouldn't happen */
/* Break after 20 packets. */
if(flow->packet_counter > 20) {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
return;
}
if(packet->packet_direction == 0)
flow->redis_s2d_first_char = packet->payload[0];
else
flow->redis_d2s_first_char = packet->payload[0];
if((flow->redis_s2d_first_char != '\0') && (flow->redis_d2s_first_char != '\0')) {
/*
*1
$4
PING
+PONG
*3
$3
SET
$19
dns.cache.127.0.0.1
$9
localhost
+OK
*/
if(((flow->redis_s2d_first_char == '*')
&& ((flow->redis_d2s_first_char == '+') || (flow->redis_d2s_first_char == ':')))
|| ((flow->redis_d2s_first_char == '*')
&& ((flow->redis_s2d_first_char == '+') || (flow->redis_s2d_first_char == ':')))) {
NDPI_LOG_INFO(ndpi_struct, "Found Redis\n");
ndpi_int_redis_add_connection(ndpi_struct, flow);
} else {
NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
}
} else
return; /* Too early */
}
void ndpi_search_redis(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
NDPI_LOG_DBG(ndpi_struct, "search Redis\n");
/* skip marked packets */
if (flow->detected_protocol_stack[0] != NDPI_PROTOCOL_REDIS) {
ndpi_check_redis(ndpi_struct, flow);
}
}
void init_redis_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
{
ndpi_set_bitmask_protocol_detection("Redis", ndpi_struct, detection_bitmask, *id,
NDPI_PROTOCOL_REDIS,
ndpi_search_redis,
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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