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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"
/* 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(const 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 *, const uint8_t *, const uint8_t *, size_t,
void *), void *object)
{
fr->handle_friendrequest = function;
fr->handle_friendrequest_isset = 1;
fr->handle_friendrequest_object = object;
}
/* 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)(const 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, const uint8_t *real_pk)
{
if (fr->received_requests_index >= MAX_RECEIVED_STORED) {
fr->received_requests_index = 0;
}
id_copy(fr->received_requests[fr->received_requests_index], real_pk);
++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, const uint8_t *real_pk)
{
uint32_t i;
for (i = 0; i < MAX_RECEIVED_STORED; ++i) {
if (id_equal(fr->received_requests[i], real_pk)) {
return 1;
}
}
return 0;
}
/* Remove real pk 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, const uint8_t *real_pk)
{
uint32_t i;
for (i = 0; i < MAX_RECEIVED_STORED; ++i) {
if (id_equal(fr->received_requests[i], real_pk)) {
sodium_memzero(fr->received_requests[i], crypto_box_PUBLICKEYBYTES);
return 0;
}
}
return -1;
}
static int friendreq_handlepacket(void *object, const uint8_t *source_pubkey, const uint8_t *packet, uint16_t length,
void *userdata)
{
Friend_Requests *fr = (Friend_Requests *)object;
if (length <= 1 + sizeof(fr->nospam) || length > ONION_CLIENT_MAX_DATA_SIZE) {
return 1;
}
++packet;
--length;
if (fr->handle_friendrequest_isset == 0) {
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);
uint32_t message_len = length - sizeof(fr->nospam);
uint8_t message[message_len + 1];
memcpy(message, packet + sizeof(fr->nospam), message_len);
message[sizeof(message) - 1] = 0; /* Be sure the message is null terminated. */
(*fr->handle_friendrequest)(fr->handle_friendrequest_object, source_pubkey, message, message_len, userdata);
return 0;
}
void friendreq_init(Friend_Requests *fr, Friend_Connections *fr_c)
{
set_friend_request_callback(fr_c, &friendreq_handlepacket, fr);
}
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