Added new dissector for Memcached.

Signed-off-by: Darryl Sokoloski <darryl@sokoloski.ca>

1 files changed, 189 insertions, 0 deletions

diff --git a/src/lib/protocols/memcached.c b/src/lib/protocols/memcached.c
new file mode 100644
index 000000000..e9deb5cc9
--- /dev/null
+++ b/src/lib/protocols/memcached.c
@@ -0,0 +1,189 @@
+/*
+ * memcached.c
+ *
+ * Copyright (C) 2009-2011 by ipoque GmbH
+ * Copyright (C) 2011-18 - 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 <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#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)     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);
+}
+
+void ndpi_search_memcached(
+        struct ndpi_detection_module_struct *ndpi_struct,
+        struct ndpi_flow_struct *flow)
+{
+    struct ndpi_packet_struct *packet = &flow->packet;
+    const u_int8_t *offset = packet->payload;
+    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;
+        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);
+}
+
+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;
+}