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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/attribute.h"
#include "libknot/errcode.h"
#include "contrib/dnstap/dnstap.h"
#include "contrib/dnstap/reader.h"
dt_reader_t* dt_reader_create(const char *file_path)
{
struct fstrm_file_options *fopt = NULL;
struct fstrm_reader_options *ropt = NULL;
dt_reader_t *reader = NULL;
fstrm_res res;
reader = calloc(1, sizeof(dt_reader_t));
if (reader == NULL) {
goto fail;
}
// Open reader.
fopt = fstrm_file_options_init();
fstrm_file_options_set_file_path(fopt, file_path);
ropt = fstrm_reader_options_init();
fstrm_reader_options_add_content_type(ropt,
(const uint8_t *) DNSTAP_CONTENT_TYPE,
strlen(DNSTAP_CONTENT_TYPE));
reader->fr = fstrm_file_reader_init(fopt, ropt);
fstrm_file_options_destroy(&fopt);
fstrm_reader_options_destroy(&ropt);
if (reader->fr == NULL) {
goto fail;
}
res = fstrm_reader_open(reader->fr);
if (res != fstrm_res_success) {
goto fail;
}
return reader;
fail:
dt_reader_free(reader);
return NULL;
}
void dt_reader_free(dt_reader_t *reader)
{
if (reader == NULL) {
return;
}
fstrm_reader_destroy(&reader->fr);
free(reader);
}
int dt_reader_read(dt_reader_t *reader, Dnstap__Dnstap **d)
{
fstrm_res res;
const uint8_t *data = NULL;
size_t len = 0;
res = fstrm_reader_read(reader->fr, &data, &len);
if (res == fstrm_res_success) {
*d = dnstap__dnstap__unpack(NULL, len, data);
if (*d == NULL) {
return KNOT_ENOMEM;
}
} else if (res == fstrm_res_failure) {
return KNOT_ERROR;
} else if (res == fstrm_res_stop) {
return KNOT_EOF;
}
return KNOT_EOK;
}
void dt_reader_free_frame(_unused_ dt_reader_t *reader, Dnstap__Dnstap **frame_ptr)
{
if (!*frame_ptr) {
return;
}
dnstap__dnstap__free_unpacked(*frame_ptr, NULL);
*frame_ptr = NULL;
}
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