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toxcore/toxcore/ping.c

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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2016-2018 The TokTok team.
* Copyright © 2013 Tox project.
* Copyright © 2013 plutooo
*/
/*
* Buffered pinging using cyclic arrays.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "ping.h"
#include <stdlib.h>
#include <string.h>
#include "DHT.h"
#include "mono_time.h"
#include "network.h"
#include "ping_array.h"
#include "util.h"
#define PING_NUM_MAX 512
/* Maximum newly announced nodes to ping per TIME_TO_PING seconds. */
#define MAX_TO_PING 32
/* Ping newly announced nodes to ping per TIME_TO_PING seconds*/
#define TIME_TO_PING 2
struct Ping {
const Mono_Time *mono_time;
DHT *dht;
Ping_Array *ping_array;
Node_format to_ping[MAX_TO_PING];
uint64_t last_to_ping;
};
#define PING_PLAIN_SIZE (1 + sizeof(uint64_t))
#define DHT_PING_SIZE (1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + PING_PLAIN_SIZE + CRYPTO_MAC_SIZE)
#define PING_DATA_SIZE (CRYPTO_PUBLIC_KEY_SIZE + sizeof(IP_Port))
int32_t ping_send_request(Ping *ping, IP_Port ipp, const uint8_t *public_key)
{
uint8_t pk[DHT_PING_SIZE];
int rc;
uint64_t ping_id;
if (id_equal(public_key, dht_get_self_public_key(ping->dht))) {
return 1;
}
uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
// generate key to encrypt ping_id with recipient privkey
dht_get_shared_key_sent(ping->dht, shared_key, public_key);
// Generate random ping_id.
uint8_t data[PING_DATA_SIZE];
id_copy(data, public_key);
memcpy(data + CRYPTO_PUBLIC_KEY_SIZE, &ipp, sizeof(IP_Port));
ping_id = ping_array_add(ping->ping_array, ping->mono_time, data, sizeof(data));
if (ping_id == 0) {
return 1;
}
uint8_t ping_plain[PING_PLAIN_SIZE];
ping_plain[0] = NET_PACKET_PING_REQUEST;
memcpy(ping_plain + 1, &ping_id, sizeof(ping_id));
pk[0] = NET_PACKET_PING_REQUEST;
id_copy(pk + 1, dht_get_self_public_key(ping->dht)); // Our pubkey
random_nonce(pk + 1 + CRYPTO_PUBLIC_KEY_SIZE); // Generate new nonce
rc = encrypt_data_symmetric(shared_key,
pk + 1 + CRYPTO_PUBLIC_KEY_SIZE,
ping_plain, sizeof(ping_plain),
pk + 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE);
if (rc != PING_PLAIN_SIZE + CRYPTO_MAC_SIZE) {
return 1;
}
return sendpacket(dht_get_net(ping->dht), ipp, pk, sizeof(pk));
}
static int ping_send_response(Ping *ping, IP_Port ipp, const uint8_t *public_key, uint64_t ping_id,
uint8_t *shared_encryption_key)
{
uint8_t pk[DHT_PING_SIZE];
int rc;
if (id_equal(public_key, dht_get_self_public_key(ping->dht))) {
return 1;
}
uint8_t ping_plain[PING_PLAIN_SIZE];
ping_plain[0] = NET_PACKET_PING_RESPONSE;
memcpy(ping_plain + 1, &ping_id, sizeof(ping_id));
pk[0] = NET_PACKET_PING_RESPONSE;
id_copy(pk + 1, dht_get_self_public_key(ping->dht)); // Our pubkey
random_nonce(pk + 1 + CRYPTO_PUBLIC_KEY_SIZE); // Generate new nonce
// Encrypt ping_id using recipient privkey
rc = encrypt_data_symmetric(shared_encryption_key,
pk + 1 + CRYPTO_PUBLIC_KEY_SIZE,
ping_plain, sizeof(ping_plain),
pk + 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE);
if (rc != PING_PLAIN_SIZE + CRYPTO_MAC_SIZE) {
return 1;
}
return sendpacket(dht_get_net(ping->dht), ipp, pk, sizeof(pk));
}
static int handle_ping_request(void *object, IP_Port source, const uint8_t *packet, uint16_t length, void *userdata)
{
DHT *dht = (DHT *)object;
int rc;
if (length != DHT_PING_SIZE) {
return 1;
}
Ping *ping = dht_get_ping(dht);
if (id_equal(packet + 1, dht_get_self_public_key(ping->dht))) {
return 1;
}
uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
uint8_t ping_plain[PING_PLAIN_SIZE];
// Decrypt ping_id
dht_get_shared_key_recv(dht, shared_key, packet + 1);
rc = decrypt_data_symmetric(shared_key,
packet + 1 + CRYPTO_PUBLIC_KEY_SIZE,
packet + 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE,
PING_PLAIN_SIZE + CRYPTO_MAC_SIZE,
ping_plain);
if (rc != sizeof(ping_plain)) {
return 1;
}
if (ping_plain[0] != NET_PACKET_PING_REQUEST) {
return 1;
}
uint64_t ping_id;
memcpy(&ping_id, ping_plain + 1, sizeof(ping_id));
// Send response
ping_send_response(ping, source, packet + 1, ping_id, shared_key);
ping_add(ping, packet + 1, source);
return 0;
}
static int handle_ping_response(void *object, IP_Port source, const uint8_t *packet, uint16_t length, void *userdata)
{
DHT *dht = (DHT *)object;
int rc;
if (length != DHT_PING_SIZE) {
return 1;
}
Ping *ping = dht_get_ping(dht);
if (id_equal(packet + 1, dht_get_self_public_key(ping->dht))) {
return 1;
}
uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
// generate key to encrypt ping_id with recipient privkey
dht_get_shared_key_sent(ping->dht, shared_key, packet + 1);
uint8_t ping_plain[PING_PLAIN_SIZE];
// Decrypt ping_id
rc = decrypt_data_symmetric(shared_key,
packet + 1 + CRYPTO_PUBLIC_KEY_SIZE,
packet + 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE,
PING_PLAIN_SIZE + CRYPTO_MAC_SIZE,
ping_plain);
if (rc != sizeof(ping_plain)) {
return 1;
}
if (ping_plain[0] != NET_PACKET_PING_RESPONSE) {
return 1;
}
uint64_t ping_id;
memcpy(&ping_id, ping_plain + 1, sizeof(ping_id));
uint8_t data[PING_DATA_SIZE];
if (ping_array_check(ping->ping_array, ping->mono_time, data, sizeof(data), ping_id) != sizeof(data)) {
return 1;
}
if (!id_equal(packet + 1, data)) {
return 1;
}
IP_Port ipp;
memcpy(&ipp, data + CRYPTO_PUBLIC_KEY_SIZE, sizeof(IP_Port));
if (!ipport_equal(&ipp, &source)) {
return 1;
}
addto_lists(dht, source, packet + 1);
return 0;
}
/* Check if public_key with ip_port is in the list.
*
* return 1 if it is.
* return 0 if it isn't.
*/
static int in_list(const Client_data *list, uint16_t length, const Mono_Time *mono_time, const uint8_t *public_key,
IP_Port ip_port)
{
unsigned int i;
for (i = 0; i < length; ++i) {
if (id_equal(list[i].public_key, public_key)) {
const IPPTsPng *ipptp;
if (net_family_is_ipv4(ip_port.ip.family)) {
ipptp = &list[i].assoc4;
} else {
ipptp = &list[i].assoc6;
}
if (!mono_time_is_timeout(mono_time, ipptp->timestamp, BAD_NODE_TIMEOUT) && ipport_equal(&ipptp->ip_port, &ip_port)) {
return 1;
}
}
}
return 0;
}
/* Add nodes to the to_ping list.
* All nodes in this list are pinged every TIME_TO_PING seconds
* and are then removed from the list.
* If the list is full the nodes farthest from our public_key are replaced.
* The purpose of this list is to enable quick integration of new nodes into the
* network while preventing amplification attacks.
*
* return 0 if node was added.
* return -1 if node was not added.
*/
int32_t ping_add(Ping *ping, const uint8_t *public_key, IP_Port ip_port)
{
if (!ip_isset(&ip_port.ip)) {
return -1;
}
if (!node_addable_to_close_list(ping->dht, public_key, ip_port)) {
return -1;
}
if (in_list(dht_get_close_clientlist(ping->dht), LCLIENT_LIST, ping->mono_time, public_key, ip_port)) {
return -1;
}
IP_Port temp;
if (dht_getfriendip(ping->dht, public_key, &temp) == 0) {
ping_send_request(ping, ip_port, public_key);
return -1;
}
unsigned int i;
for (i = 0; i < MAX_TO_PING; ++i) {
if (!ip_isset(&ping->to_ping[i].ip_port.ip)) {
memcpy(ping->to_ping[i].public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
ipport_copy(&ping->to_ping[i].ip_port, &ip_port);
return 0;
}
if (public_key_cmp(ping->to_ping[i].public_key, public_key) == 0) {
return -1;
}
}
if (add_to_list(ping->to_ping, MAX_TO_PING, public_key, ip_port, dht_get_self_public_key(ping->dht))) {
return 0;
}
return -1;
}
/* Ping all the valid nodes in the to_ping list every TIME_TO_PING seconds.
* This function must be run at least once every TIME_TO_PING seconds.
*/
void ping_iterate(Ping *ping)
{
if (!mono_time_is_timeout(ping->mono_time, ping->last_to_ping, TIME_TO_PING)) {
return;
}
if (!ip_isset(&ping->to_ping[0].ip_port.ip)) {
return;
}
unsigned int i;
for (i = 0; i < MAX_TO_PING; ++i) {
if (!ip_isset(&ping->to_ping[i].ip_port.ip)) {
break;
}
if (!node_addable_to_close_list(ping->dht, ping->to_ping[i].public_key, ping->to_ping[i].ip_port)) {
continue;
}
ping_send_request(ping, ping->to_ping[i].ip_port, ping->to_ping[i].public_key);
ip_reset(&ping->to_ping[i].ip_port.ip);
}
if (i != 0) {
ping->last_to_ping = mono_time_get(ping->mono_time);
}
}
Ping *ping_new(const Mono_Time *mono_time, DHT *dht)
{
Ping *ping = (Ping *)calloc(1, sizeof(Ping));
if (ping == nullptr) {
return nullptr;
}
ping->ping_array = ping_array_new(PING_NUM_MAX, PING_TIMEOUT);
if (ping->ping_array == nullptr) {
free(ping);
return nullptr;
}
ping->mono_time = mono_time;
ping->dht = dht;
networking_registerhandler(dht_get_net(ping->dht), NET_PACKET_PING_REQUEST, &handle_ping_request, dht);
networking_registerhandler(dht_get_net(ping->dht), NET_PACKET_PING_RESPONSE, &handle_ping_response, dht);
return ping;
}
void ping_kill(Ping *ping)
{
networking_registerhandler(dht_get_net(ping->dht), NET_PACKET_PING_REQUEST, nullptr, nullptr);
networking_registerhandler(dht_get_net(ping->dht), NET_PACKET_PING_RESPONSE, nullptr, nullptr);
ping_array_kill(ping->ping_array);
free(ping);
}
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