1 files changed, 120 insertions, 0 deletions
diff --git a/src/contrib/dnstap/writer.c b/src/contrib/dnstap/writer.c
new file mode 100644
index 0000000..03961c1
--- /dev/null
+++ b/src/contrib/dnstap/writer.c
@@ -0,0 +1,120 @@
+/*  Copyright (C) 2014 Farsight Security, Inc. <software@farsightsecurity.com>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    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
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libknot/errcode.h"
+
+#include "contrib/dnstap/dnstap.h"
+#include "contrib/dnstap/writer.h"
+
+dt_writer_t* dt_writer_create(const char *file_path, const char *version)
+{
+	struct fstrm_file_options *fopt = NULL;
+	struct fstrm_writer_options *wopt = NULL;
+	dt_writer_t *writer = NULL;
+	fstrm_res res;
+
+	writer = calloc(1, sizeof(dt_writer_t));
+	if (writer == NULL) {
+		goto fail;
+	}
+
+	// Set "version".
+	if (version != NULL) {
+		writer->len_version = strlen(version);
+		writer->version = strdup(version);
+		if (!writer->version) {
+			goto fail;
+		}
+	}
+
+	// Open writer.
+	fopt = fstrm_file_options_init();
+	fstrm_file_options_set_file_path(fopt, file_path);
+	wopt = fstrm_writer_options_init();
+	fstrm_writer_options_add_content_type(wopt,
+		(const uint8_t *) DNSTAP_CONTENT_TYPE,
+		strlen(DNSTAP_CONTENT_TYPE));
+	writer->fw = fstrm_file_writer_init(fopt, wopt);
+	fstrm_file_options_destroy(&fopt);
+	fstrm_writer_options_destroy(&wopt);
+	if (writer->fw == NULL) {
+		goto fail;
+	}
+
+	res = fstrm_writer_open(writer->fw);
+	if (res != fstrm_res_success) {
+		goto fail;
+	}
+
+	return writer;
+fail:
+	dt_writer_free(writer);
+	return NULL;
+}
+
+void dt_writer_free(dt_writer_t *writer)
+{
+	if (writer == NULL) {
+		return;
+	}
+
+	fstrm_writer_destroy(&writer->fw);
+	free(writer->version);
+	free(writer);
+}
+
+int dt_writer_write(dt_writer_t *writer, const ProtobufCMessage *msg)
+{
+	Dnstap__Dnstap dnstap = DNSTAP__DNSTAP__INIT;
+	size_t len;
+	uint8_t *data;
+
+	if (writer->fw == NULL) {
+		return KNOT_EOK;
+	}
+
+	// Only handle dnstap/Message.
+	assert(msg->descriptor == &dnstap__message__descriptor);
+
+	// Fill out 'dnstap'.
+	if (writer->version) {
+		dnstap.version.data = writer->version;
+		dnstap.version.len = writer->len_version;
+		dnstap.has_version = 1;
+	}
+	dnstap.type = DNSTAP__DNSTAP__TYPE__MESSAGE;
+	dnstap.message = (Dnstap__Message *)msg;
+
+	// Serialize the dnstap frame.
+	if (!dt_pack(&dnstap, &data, &len)) {
+		return KNOT_ENOMEM;
+	}
+
+	// Write the dnstap frame to the output stream.
+	if (fstrm_writer_write(writer->fw, data, len) != fstrm_res_success) {
+		return KNOT_ERROR;
+	}
+
+	// Cleanup.
+	free(data);
+
+	return KNOT_EOK;
+}