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/*
* Author Jerry Lundström <jerry@dns-oarc.net>
* Copyright (c) 2019-2023, OARC, Inc.
* All rights reserved.
*
* This file is part of the dnswire library.
*
* dnswire library 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.
*
* dnswire library 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 dnswire library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "dnswire/encoder.h"
#include "dnswire/trace.h"
#include <assert.h>
const char* const dnswire_encoder_state_string[] = {
"control_ready",
"control_start",
"control_accept",
"control_finish",
"frames",
"control_stop",
"done",
};
#define __state(h, s) \
__trace("state %s => %s", dnswire_encoder_state_string[(h)->state], dnswire_encoder_state_string[s]); \
(h)->state = s;
static struct tinyframe_control_field _content_type = {
TINYFRAME_CONTROL_FIELD_CONTENT_TYPE,
DNSTAP_PROTOBUF_CONTENT_TYPE_LENGTH,
(uint8_t*)DNSTAP_PROTOBUF_CONTENT_TYPE,
};
enum dnswire_result dnswire_encoder_encode(struct dnswire_encoder* handle, uint8_t* out, size_t len)
{
assert(handle);
assert(out);
assert(len);
switch (handle->state) {
case dnswire_encoder_control_ready:
switch (tinyframe_write_control(&handle->writer, out, len, TINYFRAME_CONTROL_READY, &_content_type, 1)) {
case tinyframe_ok:
__state(handle, dnswire_encoder_control_start);
return dnswire_again;
case tinyframe_need_more:
return dnswire_need_more;
default:
break;
}
return dnswire_error;
case dnswire_encoder_control_start:
switch (tinyframe_write_control_start(&handle->writer, out, len, DNSTAP_PROTOBUF_CONTENT_TYPE, DNSTAP_PROTOBUF_CONTENT_TYPE_LENGTH)) {
case tinyframe_ok:
__state(handle, dnswire_encoder_frames);
return dnswire_again;
case tinyframe_need_more:
return dnswire_need_more;
default:
break;
}
return dnswire_error;
case dnswire_encoder_control_accept:
switch (tinyframe_write_control(&handle->writer, out, len, TINYFRAME_CONTROL_ACCEPT, &_content_type, 1)) {
case tinyframe_ok:
__state(handle, dnswire_encoder_control_finish);
return dnswire_again;
case tinyframe_need_more:
return dnswire_need_more;
default:
break;
}
return dnswire_error;
case dnswire_encoder_control_finish:
switch (tinyframe_write_control(&handle->writer, out, len, TINYFRAME_CONTROL_FINISH, 0, 0)) {
case tinyframe_ok:
__state(handle, dnswire_encoder_done);
return dnswire_endofdata;
case tinyframe_need_more:
return dnswire_need_more;
default:
break;
}
return dnswire_error;
case dnswire_encoder_frames: {
if (!handle->dnstap) {
return dnswire_error;
}
size_t frame_len = dnstap_encode_protobuf_size(handle->dnstap);
if (len < tinyframe_frame_size(frame_len)) {
return dnswire_need_more;
}
uint8_t frame[frame_len];
dnstap_encode_protobuf(handle->dnstap, frame);
switch (tinyframe_write_frame(&handle->writer, out, len, frame, sizeof(frame))) {
case tinyframe_ok:
return dnswire_ok;
case tinyframe_need_more:
return dnswire_need_more;
default:
break;
}
return dnswire_error;
}
case dnswire_encoder_control_stop:
switch (tinyframe_write_control_stop(&handle->writer, out, len)) {
case tinyframe_ok:
__state(handle, dnswire_encoder_done);
return dnswire_endofdata;
case tinyframe_need_more:
return dnswire_need_more;
default:
break;
}
return dnswire_error;
case dnswire_encoder_done:
break;
}
return dnswire_error;
}
enum dnswire_result dnswire_encoder_stop(struct dnswire_encoder* handle)
{
assert(handle);
switch (handle->state) {
case dnswire_encoder_frames:
__state(handle, dnswire_encoder_control_stop);
return dnswire_ok;
default:
break;
}
return dnswire_error;
}
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