1 files changed, 160 insertions, 0 deletions
diff --git a/src/output-json-modbus.c b/src/output-json-modbus.c
new file mode 100644
index 0000000..ace8c06
--- /dev/null
+++ b/src/output-json-modbus.c
@@ -0,0 +1,160 @@
+/* Copyright (C) 2019-2020 Open Information Security Foundation
+ *
+ * You can copy, redistribute or modify this Program under the terms of
+ * the GNU General Public License version 2 as published by the Free
+ * Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include "suricata-common.h"
+#include "detect.h"
+#include "pkt-var.h"
+#include "conf.h"
+#include "threads.h"
+#include "threadvars.h"
+#include "tm-threads.h"
+#include "util-unittest.h"
+#include "util-buffer.h"
+#include "util-debug.h"
+#include "util-byte.h"
+#include "output.h"
+#include "output-json.h"
+#include "app-layer.h"
+#include "app-layer-parser.h"
+#include "output-json-modbus.h"
+#include "rust.h"
+
+typedef struct LogModbusFileCtx_ {
+    LogFileCtx *file_ctx;
+    OutputJsonCtx *eve_ctx;
+} LogModbusFileCtx;
+
+typedef struct JsonModbusLogThread_ {
+    LogModbusFileCtx *modbuslog_ctx;
+    OutputJsonThreadCtx *ctx;
+} JsonModbusLogThread;
+
+static int JsonModbusLogger(ThreadVars *tv, void *thread_data, const Packet *p, Flow *f,
+        void *state, void *tx, uint64_t tx_id)
+{
+    JsonModbusLogThread *thread = thread_data;
+
+    JsonBuilder *js =
+            CreateEveHeader(p, LOG_DIR_FLOW, "modbus", NULL, thread->modbuslog_ctx->eve_ctx);
+    if (unlikely(js == NULL)) {
+        return TM_ECODE_OK;
+    }
+    if (!rs_modbus_to_json(tx, js)) {
+        jb_free(js);
+        return TM_ECODE_FAILED;
+    }
+    OutputJsonBuilderBuffer(js, thread->ctx);
+
+    jb_free(js);
+    return TM_ECODE_OK;
+}
+
+static void OutputModbusLogDeInitCtxSub(OutputCtx *output_ctx)
+{
+    LogModbusFileCtx *modbuslog_ctx = (LogModbusFileCtx *)output_ctx->data;
+    SCFree(modbuslog_ctx);
+    SCFree(output_ctx);
+}
+
+static OutputInitResult OutputModbusLogInitSub(ConfNode *conf, OutputCtx *parent_ctx)
+{
+    OutputInitResult result = { NULL, false };
+    OutputJsonCtx *ajt = parent_ctx->data;
+
+    LogModbusFileCtx *modbuslog_ctx = SCCalloc(1, sizeof(*modbuslog_ctx));
+    if (unlikely(modbuslog_ctx == NULL)) {
+        return result;
+    }
+    modbuslog_ctx->file_ctx = ajt->file_ctx;
+    modbuslog_ctx->eve_ctx = ajt;
+
+    OutputCtx *output_ctx = SCCalloc(1, sizeof(*output_ctx));
+    if (unlikely(output_ctx == NULL)) {
+        SCFree(modbuslog_ctx);
+        return result;
+    }
+    output_ctx->data = modbuslog_ctx;
+    output_ctx->DeInit = OutputModbusLogDeInitCtxSub;
+
+    AppLayerParserRegisterLogger(IPPROTO_TCP, ALPROTO_MODBUS);
+
+    SCLogDebug("modbus log sub-module initialized.");
+
+    result.ctx = output_ctx;
+    result.ok = true;
+    return result;
+}
+
+static TmEcode JsonModbusLogThreadInit(ThreadVars *t, const void *initdata, void **data)
+{
+    if (initdata == NULL) {
+        SCLogDebug("Error getting context for EveLogModbus. \"initdata\" is NULL.");
+        return TM_ECODE_FAILED;
+    }
+
+    JsonModbusLogThread *thread = SCCalloc(1, sizeof(*thread));
+    if (unlikely(thread == NULL)) {
+        return TM_ECODE_FAILED;
+    }
+
+    thread->modbuslog_ctx = ((OutputCtx *)initdata)->data;
+    thread->ctx = CreateEveThreadCtx(t, thread->modbuslog_ctx->eve_ctx);
+    if (thread->ctx == NULL) {
+        goto error_exit;
+    }
+
+    *data = (void *)thread;
+    return TM_ECODE_OK;
+
+error_exit:
+    SCFree(thread);
+    return TM_ECODE_FAILED;
+}
+
+static TmEcode JsonModbusLogThreadDeinit(ThreadVars *t, void *data)
+{
+    JsonModbusLogThread *thread = (JsonModbusLogThread *)data;
+    if (thread == NULL) {
+        return TM_ECODE_OK;
+    }
+    FreeEveThreadCtx(thread->ctx);
+    SCFree(thread);
+    return TM_ECODE_OK;
+}
+
+bool JsonModbusAddMetadata(const Flow *f, uint64_t tx_id, JsonBuilder *js)
+{
+    void *state = FlowGetAppState(f);
+    if (state) {
+        void *tx = AppLayerParserGetTx(f->proto, ALPROTO_MODBUS, state, tx_id);
+        if (tx) {
+            return rs_modbus_to_json(tx, js);
+        }
+    }
+
+    return false;
+}
+
+void JsonModbusLogRegister(void)
+{
+    /* Register as an eve sub-module. */
+    OutputRegisterTxSubModule(LOGGER_JSON_TX, "eve-log", "JsonModbusLog", "eve-log.modbus",
+            OutputModbusLogInitSub, ALPROTO_MODBUS, JsonModbusLogger, JsonModbusLogThreadInit,
+            JsonModbusLogThreadDeinit, NULL);
+
+    SCLogDebug("modbus json logger registered.");
+}