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/*
* Author Jerry Lundström <jerry@dns-oarc.net>
* Copyright (c) 2019, 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 <dnswire/dnswire.h>
#include <dnswire/decoder.h>
#include <dnswire/encoder.h>
#include <stdlib.h>
#ifndef __dnswire_h_reader
#define __dnswire_h_reader 1
enum dnswire_reader_state {
dnswire_reader_reading_control = 0,
dnswire_reader_decoding_control = 1,
dnswire_reader_encoding_accept = 2,
dnswire_reader_writing_accept = 3,
dnswire_reader_reading = 4,
dnswire_reader_decoding = 5,
dnswire_reader_encoding_finish = 6,
dnswire_reader_writing_finish = 7,
dnswire_reader_done = 8,
};
extern const char* const dnswire_reader_state_string[];
/*
* Attributes:
* - size: The current size of the buffer
* - inc: How much the buffer will be increased by if more spare is needed
* - max: The maximum size the buffer is allowed to have
* - at: Where in the buffer we are decoding (start of data)
* - left: How much data that is still left in the buffer from `at`
* - pushed: How much data that was pushed to the buffer by `dnswire_reader_push()`
*/
struct dnswire_reader {
enum dnswire_reader_state state;
struct dnswire_decoder decoder;
uint8_t* buf;
size_t size, inc, max, at, left, pushed;
struct dnswire_encoder encoder;
uint8_t* write_buf;
size_t write_size, write_inc, write_max, write_at, write_left;
bool allow_bidirectional, is_bidirectional;
};
enum dnswire_result dnswire_reader_init(struct dnswire_reader*);
#define dnswire_reader_pushed(r) (r).pushed
#define dnswire_reader_dnstap(r) (&(r).decoder.dnstap)
#define dnswire_reader_cleanup(r) \
dnswire_decoder_cleanup((r).decoder)
#define dnswire_reader_destroy(r) \
free((r).buf); \
free((r).write_buf); \
dnswire_decoder_cleanup((r).decoder)
#define dnswire_reader_is_bidirectional(r) (r).is_bidirectional
enum dnswire_result dnswire_reader_allow_bidirectional(struct dnswire_reader*, bool);
enum dnswire_result dnswire_reader_set_bufsize(struct dnswire_reader*, size_t);
enum dnswire_result dnswire_reader_set_bufinc(struct dnswire_reader*, size_t);
enum dnswire_result dnswire_reader_set_bufmax(struct dnswire_reader*, size_t);
enum dnswire_result dnswire_reader_push(struct dnswire_reader*, const uint8_t*, size_t, uint8_t*, size_t*);
enum dnswire_result dnswire_reader_read(struct dnswire_reader*, int);
static inline enum dnswire_result dnswire_reader_fread(struct dnswire_reader* handle, FILE* fp)
{
return dnswire_reader_read(handle, fileno(fp));
}
#endif
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