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102 lines
3.9 KiB
C
102 lines
3.9 KiB
C
/*
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* onion_announce.h -- Implementation of the announce 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_ANNOUNCE_H
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#define ONION_ANNOUNCE_H
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#include "onion.h"
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#define ONION_ANNOUNCE_MAX_ENTRIES 48
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#define ONION_ANNOUNCE_TIMEOUT 300
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#define ONION_PING_ID_SIZE crypto_hash_sha256_BYTES
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#define ONION_ANNOUNCE_SENDBACK_DATA_LENGTH (crypto_secretbox_NONCEBYTES + sizeof(uint32_t) + sizeof(uint64_t) + crypto_box_PUBLICKEYBYTES + sizeof(IP_Port) + crypto_secretbox_MACBYTES)
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#define ONION_ANNOUNCE_RESPONSE_MIN_SIZE (1 + ONION_ANNOUNCE_SENDBACK_DATA_LENGTH + crypto_box_NONCEBYTES + 1 + ONION_PING_ID_SIZE + crypto_box_MACBYTES)
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#define ONION_ANNOUNCE_RESPONSE_MAX_SIZE (ONION_ANNOUNCE_RESPONSE_MIN_SIZE + sizeof(Node_format)*MAX_SENT_NODES)
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#define ONION_DATA_RESPONSE_MIN_SIZE (1 + crypto_box_NONCEBYTES + crypto_box_PUBLICKEYBYTES + crypto_box_MACBYTES)
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#if ONION_PING_ID_SIZE != crypto_box_PUBLICKEYBYTES
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#error announce response packets assume that ONION_PING_ID_SIZE is equal to crypto_box_PUBLICKEYBYTES
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#endif
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typedef struct {
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uint8_t public_key[crypto_box_PUBLICKEYBYTES];
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IP_Port ret_ip_port;
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uint8_t ret[ONION_RETURN_3];
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uint8_t data_public_key[crypto_box_PUBLICKEYBYTES];
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uint64_t time;
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} Onion_Announce_Entry;
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typedef struct {
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DHT *dht;
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Networking_Core *net;
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Onion_Announce_Entry entries[ONION_ANNOUNCE_MAX_ENTRIES];
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/* This is crypto_secretbox_KEYBYTES long just so we can use new_symmetric_key() to fill it */
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uint8_t secret_bytes[crypto_secretbox_KEYBYTES];
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Shared_Keys shared_keys_recv;
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} Onion_Announce;
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/* Create and send an onion announce request packet.
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*
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* path is the path the request will take before it is sent to dest.
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*
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* public_key and secret_key is the kepair which will be used to encrypt the request.
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* ping_id is the ping id that will be sent in the request.
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* client_id is the client id of the node we are searching for.
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* data_public_key is the public key we want others to encrypt their data packets with.
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* sendback_data is the data of ONION_ANNOUNCE_SENDBACK_DATA_LENGTH length that we expect to
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* receive back in the response.
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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_announce_request(Networking_Core *net, Onion_Path *path, Node_format dest, uint8_t *public_key,
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uint8_t *secret_key, uint8_t *ping_id, uint8_t *client_id, uint8_t *data_public_key, uint8_t *sendback_data);
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/* Create and send an onion data request packet.
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*
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* path is the path the request will take before it is sent to dest.
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* (if dest knows the person with the public_key they should
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* send the packet to that person in the form of a response)
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*
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* public_key is the real public key of the node which we want to send the data of length length to.
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* encrypt_public_key is the public key used to encrypt the data packet.
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*
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* nonce is the nonce to encrypt this packet with
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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_data_request(Networking_Core *net, Onion_Path *path, IP_Port dest, uint8_t *public_key,
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uint8_t *encrypt_public_key, uint8_t *nonce, uint8_t *data, uint16_t length);
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Onion_Announce *new_onion_announce(DHT *dht);
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void kill_onion_announce(Onion_Announce *onion_a);
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#endif
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