/* * memcached.c * * Copyright (C) 2009-11 - ipoque GmbH * Copyright (C) 2011-22 - ntop.org * Copyright (C) 2018 - eGloo Incorporated * * 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 . * */ #include "ndpi_protocol_ids.h" #define NDPI_CURRENT_PROTO NDPI_PROTOCOL_MEMCACHED #include "ndpi_api.h" #define MCDC_SET "set " #define MCDC_SET_LEN (sizeof(MCDC_SET) - 1) #define MCDC_ADD "add " #define MCDC_ADD_LEN (sizeof(MCDC_ADD) - 1) #define MCDC_REPLACE "replace " #define MCDC_REPLACE_LEN (sizeof(MCDC_REPLACE) - 1) #define MCDC_APPEND "append " #define MCDC_APPEND_LEN (sizeof(MCDC_APPEND) - 1) #define MCDC_PREPEND "prepend " #define MCDC_PREPEND_LEN (sizeof(MCDC_PREPEND) - 1) #define MCDC_CAS "cas " #define MCDC_CAS_LEN (sizeof(MCDC_CAS) - 1) #define MCDC_GET "get " #define MCDC_GET_LEN (sizeof(MCDC_GET) - 1) #define MCDC_GETS "gets " #define MCDC_GETS_LEN (sizeof(MCDC_GETS) - 1) #define MCDC_DELETE "delete " #define MCDC_DELETE_LEN (sizeof(MCDC_DELETE) - 1) #define MCDC_INCR "incr " #define MCDC_INCR_LEN (sizeof(MCDC_INCR) - 1) #define MCDC_DECR "decr " #define MCDC_DECR_LEN (sizeof(MCDC_DECR) - 1) #define MCDC_TOUCH "touch " #define MCDC_TOUCH_LEN (sizeof(MCDC_TOUCH) - 1) #define MCDC_GAT "gat " #define MCDC_GAT_LEN (sizeof(MCDC_GAT) - 1) #define MCDC_GATS "gats " #define MCDC_GATS_LEN (sizeof(MCDC_GATS) - 1) #define MCDC_STATS "stats" #define MCDC_STATS_LEN (sizeof(MCDC_STATS) - 1) #define MCDR_ERROR "ERROR\r\n" #define MCDR_ERROR_LEN (sizeof(MCDR_ERROR) - 1) #define MCDR_CLIENT_ERROR "CLIENT_ERROR " #define MCDR_CLIENT_ERROR_LEN (sizeof(MCDR_CLIENT_ERROR) - 1) #define MCDR_SERVER_ERROR "SERVER_ERROR " #define MCDR_SERVER_ERROR_LEN (sizeof(MCDR_SERVER_ERROR) - 1) #define MCDR_STORED "STORED\r\n" #define MCDR_STORED_LEN (sizeof(MCDR_STORED) - 1) #define MCDR_NOT_STORED "NOT_STORED\r\n" #define MCDR_NOT_STORED_LEN (sizeof(MCDR_NOT_STORED) - 1) #define MCDR_EXISTS "EXISTS\r\n" #define MCDR_EXISTS_LEN (sizeof(MCDR_EXISTS) - 1) #define MCDR_NOT_FOUND "NOT_FOUND\r\n" #define MCDR_NOT_FOUND_LEN (sizeof(MCDR_NOT_FOUND) - 1) #define MCDR_END "END\r\n" #define MCDR_END_LEN (sizeof(MCDR_END) - 1) #define MCDR_DELETED "DELETED\r\n" #define MCDR_DELETED_LEN (sizeof(MCDR_DELETED) - 1) #define MCDR_TOUCHED "TOUCHED\r\n" #define MCDR_TOUCHED_LEN (sizeof(MCDR_TOUCHED) - 1) #define MCDR_STAT "STAT " #define MCDR_STAT_LEN (sizeof(MCDR_STAT) - 1) #define MEMCACHED_UDP_HDR_LEN 8 #define MEMCACHED_MIN_LEN MCDR_END_LEN #define MEMCACHED_MIN_UDP_LEN (MEMCACHED_MIN_LEN + MEMCACHED_UDP_HDR_LEN) #define MEMCACHED_MIN_MATCH 2 /* Minimum number of command/responses required */ #define MEMCACHED_MATCH(cr) (cr ## _LEN > length || memcmp(offset, cr, cr ## _LEN)) static void ndpi_int_memcached_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) { NDPI_LOG_INFO(ndpi_struct, "found memcached\n"); ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_MEMCACHED, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI); } void ndpi_search_memcached( struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) { struct ndpi_packet_struct *packet = &ndpi_struct->packet; const u_int8_t *offset = packet->payload; u_int16_t length = packet->payload_packet_len; u_int8_t *matches; NDPI_LOG_DBG(ndpi_struct, "search memcached\n"); if (packet->tcp != NULL) { if (packet->payload_packet_len < MEMCACHED_MIN_LEN) { NDPI_EXCLUDE_PROTO(ndpi_struct, flow); return; } matches = &flow->l4.tcp.memcached_matches; } else if (packet->udp != NULL) { if (packet->payload_packet_len < MEMCACHED_MIN_UDP_LEN) { NDPI_EXCLUDE_PROTO(ndpi_struct, flow); return; } if ((offset[4] == 0x00 && offset[5] == 0x00) || offset[6] != 0x00 || offset[7] != 0x00) { NDPI_EXCLUDE_PROTO(ndpi_struct, flow); return; } offset += MEMCACHED_UDP_HDR_LEN; length -= MEMCACHED_UDP_HDR_LEN; matches = &flow->l4.udp.memcached_matches; } else { NDPI_EXCLUDE_PROTO(ndpi_struct, flow); return; } /* grep MCD memcached.c |\ * egrep -v '(LEN|MATCH)' |\ * sed -e 's/^#define //g' |\ * awk '{ printf "else if (! MEMCACHED_MATCH(%s)) *matches += 1;\n",$1 }' */ if (! MEMCACHED_MATCH(MCDC_SET)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_ADD)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_REPLACE)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_APPEND)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_PREPEND)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_CAS)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_GET)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_GETS)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_DELETE)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_INCR)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_DECR)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_TOUCH)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_GAT)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_GATS)) *matches += 1; else if (! MEMCACHED_MATCH(MCDC_STATS)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_ERROR)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_CLIENT_ERROR)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_SERVER_ERROR)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_STORED)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_NOT_STORED)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_EXISTS)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_NOT_FOUND)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_END)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_DELETED)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_TOUCHED)) *matches += 1; else if (! MEMCACHED_MATCH(MCDR_STAT)) *matches += 1; if (*matches >= MEMCACHED_MIN_MATCH) ndpi_int_memcached_add_connection(ndpi_struct, flow); else if(flow->packet_counter > 5) NDPI_EXCLUDE_PROTO(ndpi_struct, flow); } void init_memcached_dissector( struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask) { ndpi_set_bitmask_protocol_detection("MEMCACHED", ndpi_struct, detection_bitmask, *id, NDPI_PROTOCOL_MEMCACHED, ndpi_search_memcached, NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD, SAVE_DETECTION_BITMASK_AS_UNKNOWN, ADD_TO_DETECTION_BITMASK); *id += 1; }