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/* 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;
}
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