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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, uint8_t * data, uint32_t length)
{
uint8_t packet[MAX_DATA_SIZE];
int len = create_request(packet, public_key, data, length, 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 void (*handle_friendrequest)(uint8_t *, uint8_t *, uint16_t);
static uint8_t handle_friendrequest_isset = 0;
/* set the function that will be executed when a friend request is received. */
void callback_friendrequest(void (*function)(uint8_t *, uint8_t *, uint16_t))
{
handle_friendrequest = function;
handle_friendrequest_isset = 1;
}
/*NOTE: the following is just a temporary fix for the multiple friend requests recieved at the same time problem
TODO: Make this better (This will most likely tie in with the way we will handle spam.)*/
#define MAX_RECIEVED_STORED 32
static uint8_t recieved_requests[MAX_RECIEVED_STORED][crypto_box_PUBLICKEYBYTES];
static uint16_t recieved_requests_index;
/*Add to list of recieved friend requests*/
static void addto_recievedlist(uint8_t * client_id)
{
if(recieved_requests_index >= MAX_RECIEVED_STORED)
recieved_requests_index = 0;
memcpy(recieved_requests[recieved_requests_index], client_id, crypto_box_PUBLICKEYBYTES);
++recieved_requests_index;
}
/* Check if a friend request was already recieved
return 0 if not, 1 if we did */
static int request_recieved(uint8_t * client_id)
{
uint32_t i;
for(i = 0; i < MAX_RECIEVED_STORED; ++i)
if(memcmp(recieved_requests[i], client_id, crypto_box_PUBLICKEYBYTES) == 0)
return 1;
return 0;
}
int friendreq_handlepacket(uint8_t * packet, uint32_t length, IP_Port source)
{
if(packet[0] == 32)
{
if(length <= crypto_box_PUBLICKEYBYTES * 2 + crypto_box_NONCEBYTES + 1 + ENCRYPTION_PADDING &&
length > MAX_DATA_SIZE + ENCRYPTION_PADDING)
return 1;
if(memcmp(packet + 1, self_public_key, crypto_box_PUBLICKEYBYTES) == 0) /* check if request is for us. */
{
if(handle_friendrequest_isset == 0)
return 1;
uint8_t public_key[crypto_box_PUBLICKEYBYTES];
uint8_t data[MAX_DATA_SIZE];
int len = handle_request(public_key, data, packet, length);
if(len == -1)
return 1;
if(request_recieved(public_key))
return 1;
addto_recievedlist(public_key);
(*handle_friendrequest)(public_key, data, len);
}
else /* if request is not for us, try routing it. */
if(route_packet(packet + 1, packet, length) == length)
return 0;
}
return 1;
}
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