1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* 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 160
#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_REQUEST_SIZE (1 + crypto_box_NONCEBYTES + crypto_box_PUBLICKEYBYTES + ONION_PING_ID_SIZE + crypto_box_PUBLICKEYBYTES + crypto_box_PUBLICKEYBYTES + ONION_ANNOUNCE_SENDBACK_DATA_LENGTH + crypto_box_MACBYTES)
#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 an onion announce request packet in packet of max_packet_length (recommended size ONION_ANNOUNCE_REQUEST_SIZE).
*
* dest_client_id is the public key of the node the packet will be sent to.
* 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 packet length on success.
*/
int create_announce_request(uint8_t *packet, uint16_t max_packet_length, const uint8_t *dest_client_id,
const uint8_t *public_key, const uint8_t *secret_key, const uint8_t *ping_id, const uint8_t *client_id,
const uint8_t *data_public_key, uint64_t sendback_data);
/* Create an onion data request packet in packet of max_packet_length (recommended size ONION_MAX_PACKET_SIZE).
*
* 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
*
* return -1 on failure.
* return 0 on success.
*/
int create_data_request(uint8_t *packet, uint16_t max_packet_length, const uint8_t *public_key,
const uint8_t *encrypt_public_key, const uint8_t *nonce, const uint8_t *data, uint16_t length);
/* 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, const Onion_Path *path, Node_format dest, const uint8_t *public_key,
const uint8_t *secret_key, const uint8_t *ping_id, const uint8_t *client_id, const 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, const Onion_Path *path, IP_Port dest, const uint8_t *public_key,
const uint8_t *encrypt_public_key, const uint8_t *nonce, const uint8_t *data, uint16_t length);
Onion_Announce *new_onion_announce(DHT *dht);
void kill_onion_announce(Onion_Announce *onion_a);
#endif
|
