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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/>.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "friend_requests.h"
#include "util.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(Onion_Client *onion_c, 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];
temp[0] = CRYPTO_PACKET_FRIEND_REQ;
memcpy(temp + 1, &nospam_num, sizeof(nospam_num));
memcpy(temp + 1 + sizeof(nospam_num), data, length);
int friend_num = onion_friend_num(onion_c, public_key);
if (friend_num == -1)
return -1;
int num = send_onion_data(onion_c, friend_num, temp, 1 + sizeof(nospam_num) + length);
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)(void *, uint8_t *, uint8_t *, uint16_t, void *),
void *object, void *userdata)
{
fr->handle_friendrequest = function;
fr->handle_friendrequest_isset = 1;
fr->handle_friendrequest_object = object;
fr->handle_friendrequest_userdata = userdata;
}
/* Set the function used to check if a friend request should be displayed to the user or not. */
void set_filter_function(Friend_Requests *fr, int (*function)(uint8_t *, void *), void *userdata)
{
fr->filter_function = function;
fr->filter_function_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;
id_copy(fr->received_requests[fr->received_requests_index], client_id);
++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 (id_equal(fr->received_requests[i], client_id))
return 1;
return 0;
}
/* Remove client id from received_requests list.
*
* return 0 if it removed it successfully.
* return -1 if it didn't find it.
*/
int remove_request_received(Friend_Requests *fr, uint8_t *client_id)
{
uint32_t i;
for (i = 0; i < MAX_RECEIVED_STORED; ++i) {
if (id_equal(fr->received_requests[i], client_id)) {
memset(fr->received_requests[i], 0, crypto_box_PUBLICKEYBYTES);
return 0;
}
}
return -1;
}
static int friendreq_handlepacket(void *object, uint8_t *source_pubkey, uint8_t *packet, uint32_t length)
{
if (length == 0)
return 1;
++packet;
--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;
if (fr->filter_function)
if ((*fr->filter_function)(source_pubkey, fr->filter_function_userdata) != 0)
return 1;
addto_receivedlist(fr, source_pubkey);
uint8_t message[length - 4 + 1];
memcpy(message, packet + 4, length - 4);
message[sizeof(message) - 1] = 0; /* Be sure the message is null terminated. */
(*fr->handle_friendrequest)(fr->handle_friendrequest_object, source_pubkey, message, length - 4,
fr->handle_friendrequest_userdata);
return 0;
}
void friendreq_init(Friend_Requests *fr, Onion_Client *onion_c)
{
oniondata_registerhandler(onion_c, CRYPTO_PACKET_FRIEND_REQ, &friendreq_handlepacket, fr);
}
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