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/* 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/>.
*
*/
#include "friend_requests.h"
uint8_t self_public_key[crypto_box_PUBLICKEYBYTES];
/* Try to send a friendrequest 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(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(packet, public_key, temp, length + sizeof(nospam_num),
32); /* 32 is friend request packet id */
if (len == -1)
return -1;
IP_Port ip_port = DHT_getfriendip(public_key);
if (ip_port.ip.i == 1)
return -1;
if (ip_port.ip.i != 0) {
if (sendpacket(ip_port, packet, len) != -1)
return 0;
return -1;
}
int num = route_tofriend(public_key, packet, len);
if (num == 0)
return -1;
return num;
}
static uint32_t nospam;
/*
* Set and get the nospam variable used to prevent one type of friend request spam
*/
void set_nospam(uint32_t num)
{
nospam = num;
}
uint32_t get_nospam()
{
return nospam;
}
static void (*handle_friendrequest)(uint8_t *, uint8_t *, uint16_t, void *);
static uint8_t handle_friendrequest_isset = 0;
static void *handle_friendrequest_userdata;
/* set the function that will be executed when a friend request is received. */
void callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t, void *), void *userdata)
{
handle_friendrequest = function;
handle_friendrequest_isset = 1;
handle_friendrequest_userdata = userdata;
}
/*NOTE: the following is just a temporary fix for the multiple friend requests received at the same time problem
TODO: Make this better (This will most likely tie in with the way we will handle spam.)*/
#define MAX_RECEIVED_STORED 32
static uint8_t received_requests[MAX_RECEIVED_STORED][crypto_box_PUBLICKEYBYTES];
static uint16_t received_requests_index;
/*Add to list of received friend requests*/
static void addto_receivedlist(uint8_t *client_id)
{
if (received_requests_index >= MAX_RECEIVED_STORED)
received_requests_index = 0;
memcpy(received_requests[received_requests_index], client_id, crypto_box_PUBLICKEYBYTES);
++received_requests_index;
}
/* Check if a friend request was already received
return 0 if not, 1 if we did */
static int request_received(uint8_t *client_id)
{
uint32_t i;
for (i = 0; i < MAX_RECEIVED_STORED; ++i) {
if (memcmp(received_requests[i], client_id, crypto_box_PUBLICKEYBYTES) == 0)
return 1;
}
return 0;
}
static int friendreq_handlepacket(IP_Port source, uint8_t *source_pubkey, uint8_t *packet, uint32_t length)
{
if (handle_friendrequest_isset == 0)
return 1;
if (length <= sizeof(nospam))
return 1;
if (request_received(source_pubkey))
return 1;
if (memcmp(packet, &nospam, sizeof(nospam)) != 0)
return 1;
addto_receivedlist(source_pubkey);
(*handle_friendrequest)(source_pubkey, packet + 4, length - 4, handle_friendrequest_userdata);
return 0;
}
void friendreq_init(void)
{
cryptopacket_registerhandler(32, &friendreq_handlepacket);
}
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