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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2018 The TokTok team.
* Copyright © 2013 Tox project.
*/
/*
* Handle friend requests.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "friend_requests.h"
#include <stdlib.h>
#include <string.h>
#include "util.h"
/* NOTE: The following is just a temporary fix for the multiple friend requests received at the same time problem.
* TODO(irungentoo): Make this better (This will most likely tie in with the way we will handle spam.)
*/
#define MAX_RECEIVED_STORED 32
struct Received_Requests {
uint8_t requests[MAX_RECEIVED_STORED][CRYPTO_PUBLIC_KEY_SIZE];
uint16_t requests_index;
};
struct Friend_Requests {
uint32_t nospam;
fr_friend_request_cb *handle_friendrequest;
uint8_t handle_friendrequest_isset;
void *handle_friendrequest_object;
filter_function_cb *filter_function;
void *filter_function_userdata;
struct Received_Requests received;
};
/* 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, fr_friend_request_cb *function, 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, filter_function_cb *function, 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 false if it did not.
* return true if it did.
*/
static bool request_received(const Friend_Requests *fr, const uint8_t *real_pk)
{
for (uint32_t i = 0; i < MAX_RECEIVED_STORED; ++i) {
if (id_equal(fr->received.requests[i], real_pk)) {
return true;
}
}
return false;
}
/* 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)
{
for (uint32_t i = 0; i < MAX_RECEIVED_STORED; ++i) {
if (id_equal(fr->received.requests[i], real_pk)) {
crypto_memzero(fr->received.requests[i], CRYPTO_PUBLIC_KEY_SIZE);
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 *const 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);
const uint32_t message_len = length - sizeof(fr->nospam);
VLA(uint8_t, message, message_len + 1);
memcpy(message, packet + sizeof(fr->nospam), message_len);
message[SIZEOF_VLA(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);
}
Friend_Requests *friendreq_new(void)
{
return (Friend_Requests *)calloc(1, sizeof(Friend_Requests));
}
void friendreq_kill(Friend_Requests *fr)
{
free(fr);
}
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