summaryrefslogtreecommitdiff
path: root/toxcore/friend_requests.c
blob: 51a8112f2e5d0a77a562d6846ebefd5302097b9b (plain)
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
140
141
142
143
144
145
146
147
148
/* friend_requests.c
 *
 * Handle friend requests.
 *
 *  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/>.
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "friend_requests.h"

/* Try to send a friend request to peer with public_key.
 * data is the data in the request and length is the length.
 *
 *  return -1 if failure.
 *  return  0 if it sent the friend request directly to the friend.
 *  return the number of peers it was routed through if it did not send it directly.
 */
int send_friendrequest(DHT *dht, uint8_t *public_key, uint32_t nospam_num, uint8_t *data, uint32_t length)
{
    if (length + sizeof(nospam_num) > MAX_DATA_SIZE)
        return -1;

    uint8_t temp[MAX_DATA_SIZE];
    memcpy(temp, &nospam_num, sizeof(nospam_num));
    memcpy(temp + sizeof(nospam_num), data, length);
    uint8_t packet[MAX_DATA_SIZE];
    int len = create_request(dht->c->self_public_key, dht->c->self_secret_key, packet, public_key, temp,
                             length + sizeof(nospam_num),
                             CRYPTO_PACKET_FRIEND_REQ);

    if (len == -1)
        return -1;

    IP_Port ip_port = DHT_getfriendip(dht, public_key);

    if (ip_port.ip.uint32 == 1)
        return -1;

    if (ip_port.ip.uint32 != 0) {
        if (sendpacket(dht->c->lossless_udp->net, ip_port, packet, len) != -1)
            return 0;

        return -1;
    }

    int num = route_tofriend(dht, public_key, packet, len);

    if (num == 0)
        return -1;

    return num;
}


/* Set and get the nospam variable used to prevent one type of friend request spam. */
void set_nospam(Friend_Requests *fr, uint32_t num)
{
    fr->nospam = num;
}

uint32_t get_nospam(Friend_Requests *fr)
{
    return fr->nospam;
}


/* Set the function that will be executed when a friend request is received. */
void callback_friendrequest(Friend_Requests *fr, void (*function)(uint8_t *, uint8_t *, uint16_t, void *),
                            void *userdata)
{
    fr->handle_friendrequest = function;
    fr->handle_friendrequest_isset = 1;
    fr->handle_friendrequest_userdata = userdata;
}

/* Add to list of received friend requests. */
static void addto_receivedlist(Friend_Requests *fr, uint8_t *client_id)
{
    if (fr->received_requests_index >= MAX_RECEIVED_STORED)
        fr->received_requests_index = 0;

    memcpy(fr->received_requests[fr->received_requests_index], client_id, crypto_box_PUBLICKEYBYTES);
    ++fr->received_requests_index;
}

/* Check if a friend request was already received.
 *
 *  return 0 if it did not.
 *  return 1 if it did.
 */
static int request_received(Friend_Requests *fr, uint8_t *client_id)
{
    uint32_t i;

    for (i = 0; i < MAX_RECEIVED_STORED; ++i) {
        if (memcmp(fr->received_requests[i], client_id, crypto_box_PUBLICKEYBYTES) == 0)
            return 1;
    }

    return 0;
}


static int friendreq_handlepacket(void *object, IP_Port source, uint8_t *source_pubkey, uint8_t *packet,
                                  uint32_t length)
{
    Friend_Requests *fr = object;

    if (fr->handle_friendrequest_isset == 0)
        return 1;

    if (length <= sizeof(fr->nospam))
        return 1;

    if (request_received(fr, source_pubkey))
        return 1;

    if (memcmp(packet, &fr->nospam, sizeof(fr->nospam)) != 0)
        return 1;

    addto_receivedlist(fr, source_pubkey);
    (*fr->handle_friendrequest)(source_pubkey, packet + 4, length - 4, fr->handle_friendrequest_userdata);
    return 0;
}

void friendreq_init(Friend_Requests *fr, Net_Crypto *c)
{
    cryptopacket_registerhandler(c, CRYPTO_PACKET_FRIEND_REQ, &friendreq_handlepacket, fr);
}