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/*
* onion_announce.h -- Implementation of the announce part of docs/Prevent_Tracking.txt
*
* Copyright (C) 2013 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox 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.
*
* Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
#ifndef ONION_ANNOUNCE_H
#define ONION_ANNOUNCE_H
#include "onion.h"
#define ONION_ANNOUNCE_MAX_ENTRIES 48
#define ONION_ANNOUNCE_TIMEOUT 300
#define ONION_PING_ID_SIZE crypto_hash_sha256_BYTES
#define ONION_ANNOUNCE_SENDBACK_DATA_LENGTH (sizeof(uint64_t))
#define ONION_ANNOUNCE_RESPONSE_MIN_SIZE (1 + ONION_ANNOUNCE_SENDBACK_DATA_LENGTH + crypto_box_NONCEBYTES + 1 + ONION_PING_ID_SIZE + crypto_box_MACBYTES)
#define ONION_ANNOUNCE_RESPONSE_MAX_SIZE (ONION_ANNOUNCE_RESPONSE_MIN_SIZE + sizeof(Node_format)*MAX_SENT_NODES)
#define ONION_DATA_RESPONSE_MIN_SIZE (1 + crypto_box_NONCEBYTES + crypto_box_PUBLICKEYBYTES + crypto_box_MACBYTES)
#if ONION_PING_ID_SIZE != crypto_box_PUBLICKEYBYTES
#error announce response packets assume that ONION_PING_ID_SIZE is equal to crypto_box_PUBLICKEYBYTES
#endif
#define ONION_DATA_REQUEST_MIN_SIZE (1 + crypto_box_PUBLICKEYBYTES + crypto_box_NONCEBYTES + crypto_box_PUBLICKEYBYTES + crypto_box_MACBYTES)
#define MAX_DATA_REQUEST_SIZE (ONION_MAX_DATA_SIZE - ONION_DATA_REQUEST_MIN_SIZE)
typedef struct {
uint8_t public_key[crypto_box_PUBLICKEYBYTES];
IP_Port ret_ip_port;
uint8_t ret[ONION_RETURN_3];
uint8_t data_public_key[crypto_box_PUBLICKEYBYTES];
uint64_t time;
} Onion_Announce_Entry;
typedef struct {
DHT *dht;
Networking_Core *net;
Onion_Announce_Entry entries[ONION_ANNOUNCE_MAX_ENTRIES];
/* This is crypto_box_KEYBYTES long just so we can use new_symmetric_key() to fill it */
uint8_t secret_bytes[crypto_box_KEYBYTES];
Shared_Keys shared_keys_recv;
} Onion_Announce;
/* Create and send an onion announce request packet.
*
* path is the path the request will take before it is sent to dest.
*
* public_key and secret_key is the kepair which will be used to encrypt the request.
* ping_id is the ping id that will be sent in the request.
* client_id is the client id of the node we are searching for.
* data_public_key is the public key we want others to encrypt their data packets with.
* sendback_data is the data of ONION_ANNOUNCE_SENDBACK_DATA_LENGTH length that we expect to
* receive back in the response.
*
* return -1 on failure.
* return 0 on success.
*/
int send_announce_request(Networking_Core *net, Onion_Path *path, Node_format dest, uint8_t *public_key,
uint8_t *secret_key, uint8_t *ping_id, uint8_t *client_id, uint8_t *data_public_key, uint64_t sendback_data);
/* Create and send an onion data request packet.
*
* path is the path the request will take before it is sent to dest.
* (if dest knows the person with the public_key they should
* send the packet to that person in the form of a response)
*
* public_key is the real public key of the node which we want to send the data of length length to.
* encrypt_public_key is the public key used to encrypt the data packet.
*
* nonce is the nonce to encrypt this packet with
*
* The maximum length of data is MAX_DATA_REQUEST_SIZE.
*
* return -1 on failure.
* return 0 on success.
*/
int send_data_request(Networking_Core *net, Onion_Path *path, IP_Port dest, uint8_t *public_key,
uint8_t *encrypt_public_key, uint8_t *nonce, uint8_t *data, uint16_t length);
Onion_Announce *new_onion_announce(DHT *dht);
void kill_onion_announce(Onion_Announce *onion_a);
#endif
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