mirror of
https://github.com/irungentoo/toxcore.git
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136 lines
4.6 KiB
C
136 lines
4.6 KiB
C
/*
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* onion.h -- Implementation of the onion part of docs/Prevent_Tracking.txt
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*
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* Copyright (C) 2013 Tox project All Rights Reserved.
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*
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* This file is part of Tox.
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*
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* Tox is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Tox is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Tox. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef ONION_H
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#define ONION_H
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#include "DHT.h"
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typedef struct {
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DHT *dht;
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Networking_Core *net;
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uint8_t secret_symmetric_key[crypto_box_KEYBYTES];
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uint64_t timestamp;
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Shared_Keys shared_keys_1;
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Shared_Keys shared_keys_2;
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Shared_Keys shared_keys_3;
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int (*recv_1_function)(void *, IP_Port, const uint8_t *, uint16_t);
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void *callback_object;
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} Onion;
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#define ONION_MAX_PACKET_SIZE 1400
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#define ONION_RETURN_1 (crypto_box_NONCEBYTES + SIZE_IPPORT + crypto_box_MACBYTES)
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#define ONION_RETURN_2 (crypto_box_NONCEBYTES + SIZE_IPPORT + crypto_box_MACBYTES + ONION_RETURN_1)
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#define ONION_RETURN_3 (crypto_box_NONCEBYTES + SIZE_IPPORT + crypto_box_MACBYTES + ONION_RETURN_2)
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#define ONION_SEND_BASE (crypto_box_PUBLICKEYBYTES + SIZE_IPPORT + crypto_box_MACBYTES)
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#define ONION_SEND_3 (crypto_box_NONCEBYTES + ONION_SEND_BASE + ONION_RETURN_2)
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#define ONION_SEND_2 (crypto_box_NONCEBYTES + ONION_SEND_BASE*2 + ONION_RETURN_1)
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#define ONION_SEND_1 (crypto_box_NONCEBYTES + ONION_SEND_BASE*3)
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#define ONION_MAX_DATA_SIZE (ONION_MAX_PACKET_SIZE - (ONION_SEND_1 + 1))
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#define ONION_RESPONSE_MAX_DATA_SIZE (ONION_MAX_PACKET_SIZE - (1 + ONION_RETURN_3))
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typedef struct {
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uint8_t shared_key1[crypto_box_BEFORENMBYTES];
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uint8_t shared_key2[crypto_box_BEFORENMBYTES];
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uint8_t shared_key3[crypto_box_BEFORENMBYTES];
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uint8_t public_key1[crypto_box_PUBLICKEYBYTES];
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uint8_t public_key2[crypto_box_PUBLICKEYBYTES];
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uint8_t public_key3[crypto_box_PUBLICKEYBYTES];
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IP_Port ip_port1;
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IP_Port ip_port2;
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IP_Port ip_port3;
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} Onion_Path;
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/* Create a new onion path.
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*
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* Create a new onion path out of nodes (nodes is a list of 3 nodes)
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*
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* new_path must be an empty memory location of atleast Onion_Path size.
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*
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* return -1 on failure.
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* return 0 on success.
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*/
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int create_onion_path(const DHT *dht, Onion_Path *new_path, const Node_format *nodes);
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/* Create a onion packet.
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*
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* Use Onion_Path path to create packet for data of length to dest.
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* Maximum length of data is ONION_MAX_DATA_SIZE.
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* packet should be at least ONION_MAX_PACKET_SIZE big.
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*
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* return -1 on failure.
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* return length of created packet on success.
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*/
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int create_onion_packet(uint8_t *packet, uint16_t max_packet_length, const Onion_Path *path, IP_Port dest,
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const uint8_t *data, uint32_t length);
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/* Create and send a onion packet.
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*
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* Use Onion_Path path to send data of length to dest.
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* Maximum length of data is ONION_MAX_DATA_SIZE.
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*
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* return -1 on failure.
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* return 0 on success.
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*/
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int send_onion_packet(Networking_Core *net, const Onion_Path *path, IP_Port dest, const uint8_t *data, uint32_t length);
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/* Create and send a onion response sent initially to dest with.
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* Maximum length of data is ONION_RESPONSE_MAX_DATA_SIZE.
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*
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* return -1 on failure.
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* return 0 on success.
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*/
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int send_onion_response(Networking_Core *net, IP_Port dest, const uint8_t *data, uint32_t length, const uint8_t *ret);
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/* Function to handle/send received decrypted versions of the packet sent with send_onion_packet.
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*
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* return 0 on success.
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* return 1 on failure.
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*
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* Used to handle these packets that are received in a non traditional way (by TCP for example).
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*
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* Source family must be set to something else than AF_INET6 or AF_INET so that the callback gets called
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* when the response is received.
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*/
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int onion_send_1(const Onion *onion, const uint8_t *plain, uint32_t len, IP_Port source, const uint8_t *nonce);
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/* Set the callback to be called when the dest ip_port doesn't have AF_INET6 or AF_INET as the family.
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*
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* Format: function(void *object, IP_Port dest, uint8_t *data, uint32_t length)
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*/
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void set_callback_handle_recv_1(Onion *onion, int (*function)(void *, IP_Port, const uint8_t *, uint16_t),
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void *object);
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Onion *new_onion(DHT *dht);
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void kill_onion(Onion *onion);
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#endif
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