From e6cb2c87dc119268a75ac6f41645b96400abdd7c Mon Sep 17 00:00:00 2001
From: aunsane <aunsane@gmail.com>
Date: Wed, 20 Dec 2017 23:44:35 +0300
Subject: libtox moved to tox folder instead of libs
---
libs/libtox/src/toxcore/DHT.c | 2853 -----------------------------------------
1 file changed, 2853 deletions(-)
delete mode 100644 libs/libtox/src/toxcore/DHT.c
(limited to 'libs/libtox/src/toxcore/DHT.c')
diff --git a/libs/libtox/src/toxcore/DHT.c b/libs/libtox/src/toxcore/DHT.c
deleted file mode 100644
index 4ebe7f3344..0000000000
--- a/libs/libtox/src/toxcore/DHT.c
+++ /dev/null
@@ -1,2853 +0,0 @@
-/*
- * An implementation of the DHT as seen in docs/updates/DHT.md
- */
-
-/*
- * Copyright © 2016-2017 The TokTok team.
- * Copyright © 2013 Tox project.
- *
- * This file is part of Tox, the free peer to peer instant messenger.
- *
- * 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 "DHT.h"
-
-#include "LAN_discovery.h"
-#include "logger.h"
-#include "network.h"
-#include "ping.h"
-#include "util.h"
-
-#include <assert.h>
-
-/* The timeout after which a node is discarded completely. */
-#define KILL_NODE_TIMEOUT (BAD_NODE_TIMEOUT + PING_INTERVAL)
-
-/* Ping interval in seconds for each random sending of a get nodes request. */
-#define GET_NODE_INTERVAL 20
-
-#define MAX_PUNCHING_PORTS 48
-
-/* Interval in seconds between punching attempts*/
-#define PUNCH_INTERVAL 3
-
-/* Time in seconds after which punching parameters will be reset */
-#define PUNCH_RESET_TIME 40
-
-#define MAX_NORMAL_PUNCHING_TRIES 5
-
-#define NAT_PING_REQUEST 0
-#define NAT_PING_RESPONSE 1
-
-/* Number of get node requests to send to quickly find close nodes. */
-#define MAX_BOOTSTRAP_TIMES 5
-
-#define ASSOC_COUNT 2
-
-/* Compares pk1 and pk2 with pk.
- *
- * return 0 if both are same distance.
- * return 1 if pk1 is closer.
- * return 2 if pk2 is closer.
- */
-int id_closest(const uint8_t *pk, const uint8_t *pk1, const uint8_t *pk2)
-{
- for (size_t i = 0; i < CRYPTO_PUBLIC_KEY_SIZE; ++i) {
-
- uint8_t distance1 = pk[i] ^ pk1[i];
- uint8_t distance2 = pk[i] ^ pk2[i];
-
- if (distance1 < distance2) {
- return 1;
- }
-
- if (distance1 > distance2) {
- return 2;
- }
- }
-
- return 0;
-}
-
-/* Return index of first unequal bit number.
- */
-static unsigned int bit_by_bit_cmp(const uint8_t *pk1, const uint8_t *pk2)
-{
- unsigned int i;
- unsigned int j = 0;
-
- for (i = 0; i < CRYPTO_PUBLIC_KEY_SIZE; ++i) {
- if (pk1[i] == pk2[i]) {
- continue;
- }
-
- for (j = 0; j < 8; ++j) {
- uint8_t mask = 1 << (7 - j);
-
- if ((pk1[i] & mask) != (pk2[i] & mask)) {
- break;
- }
- }
-
- break;
- }
-
- return i * 8 + j;
-}
-
-/* Shared key generations are costly, it is therefor smart to store commonly used
- * ones so that they can re used later without being computed again.
- *
- * If shared key is already in shared_keys, copy it to shared_key.
- * else generate it into shared_key and copy it to shared_keys
- */
-void get_shared_key(Shared_Keys *shared_keys, uint8_t *shared_key, const uint8_t *secret_key, const uint8_t *public_key)
-{
- uint32_t num = ~0;
- uint32_t curr = 0;
-
- for (uint32_t i = 0; i < MAX_KEYS_PER_SLOT; ++i) {
- int index = public_key[30] * MAX_KEYS_PER_SLOT + i;
- Shared_Key *key = &shared_keys->keys[index];
-
- if (key->stored) {
- if (id_equal(public_key, key->public_key)) {
- memcpy(shared_key, key->shared_key, CRYPTO_SHARED_KEY_SIZE);
- ++key->times_requested;
- key->time_last_requested = unix_time();
- return;
- }
-
- if (num != 0) {
- if (is_timeout(key->time_last_requested, KEYS_TIMEOUT)) {
- num = 0;
- curr = index;
- } else if (num > key->times_requested) {
- num = key->times_requested;
- curr = index;
- }
- }
- } else if (num != 0) {
- num = 0;
- curr = index;
- }
- }
-
- encrypt_precompute(public_key, secret_key, shared_key);
-
- if (num != (uint32_t)~0) {
- Shared_Key *key = &shared_keys->keys[curr];
- key->stored = 1;
- key->times_requested = 1;
- memcpy(key->public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
- memcpy(key->shared_key, shared_key, CRYPTO_SHARED_KEY_SIZE);
- key->time_last_requested = unix_time();
- }
-}
-
-/* Copy shared_key to encrypt/decrypt DHT packet from public_key into shared_key
- * for packets that we receive.
- */
-void DHT_get_shared_key_recv(DHT *dht, uint8_t *shared_key, const uint8_t *public_key)
-{
- get_shared_key(&dht->shared_keys_recv, shared_key, dht->self_secret_key, public_key);
-}
-
-/* Copy shared_key to encrypt/decrypt DHT packet from public_key into shared_key
- * for packets that we send.
- */
-void DHT_get_shared_key_sent(DHT *dht, uint8_t *shared_key, const uint8_t *public_key)
-{
- get_shared_key(&dht->shared_keys_sent, shared_key, dht->self_secret_key, public_key);
-}
-
-#define CRYPTO_SIZE 1 + CRYPTO_PUBLIC_KEY_SIZE * 2 + CRYPTO_NONCE_SIZE
-
-/* Create a request to peer.
- * send_public_key and send_secret_key are the pub/secret keys of the sender.
- * recv_public_key is public key of receiver.
- * packet must be an array of MAX_CRYPTO_REQUEST_SIZE big.
- * Data represents the data we send with the request with length being the length of the data.
- * request_id is the id of the request (32 = friend request, 254 = ping request).
- *
- * return -1 on failure.
- * return the length of the created packet on success.
- */
-int create_request(const uint8_t *send_public_key, const uint8_t *send_secret_key, uint8_t *packet,
- const uint8_t *recv_public_key, const uint8_t *data, uint32_t length, uint8_t request_id)
-{
- if (!send_public_key || !packet || !recv_public_key || !data) {
- return -1;
- }
-
- if (MAX_CRYPTO_REQUEST_SIZE < length + CRYPTO_SIZE + 1 + CRYPTO_MAC_SIZE) {
- return -1;
- }
-
- uint8_t *nonce = packet + 1 + CRYPTO_PUBLIC_KEY_SIZE * 2;
- random_nonce(nonce);
- uint8_t temp[MAX_CRYPTO_REQUEST_SIZE];
- memcpy(temp + 1, data, length);
- temp[0] = request_id;
- int len = encrypt_data(recv_public_key, send_secret_key, nonce, temp, length + 1,
- CRYPTO_SIZE + packet);
-
- if (len == -1) {
- crypto_memzero(temp, MAX_CRYPTO_REQUEST_SIZE);
- return -1;
- }
-
- packet[0] = NET_PACKET_CRYPTO;
- memcpy(packet + 1, recv_public_key, CRYPTO_PUBLIC_KEY_SIZE);
- memcpy(packet + 1 + CRYPTO_PUBLIC_KEY_SIZE, send_public_key, CRYPTO_PUBLIC_KEY_SIZE);
-
- crypto_memzero(temp, MAX_CRYPTO_REQUEST_SIZE);
- return len + CRYPTO_SIZE;
-}
-
-/* Puts the senders public key in the request in public_key, the data from the request
- * in data if a friend or ping request was sent to us and returns the length of the data.
- * packet is the request packet and length is its length.
- *
- * return -1 if not valid request.
- */
-int handle_request(const uint8_t *self_public_key, const uint8_t *self_secret_key, uint8_t *public_key, uint8_t *data,
- uint8_t *request_id, const uint8_t *packet, uint16_t length)
-{
- if (!self_public_key || !public_key || !data || !request_id || !packet) {
- return -1;
- }
-
- if (length <= CRYPTO_SIZE + CRYPTO_MAC_SIZE || length > MAX_CRYPTO_REQUEST_SIZE) {
- return -1;
- }
-
- if (!id_equal(packet + 1, self_public_key)) {
- return -1;
- }
-
- memcpy(public_key, packet + 1 + CRYPTO_PUBLIC_KEY_SIZE, CRYPTO_PUBLIC_KEY_SIZE);
- const uint8_t *nonce = packet + 1 + CRYPTO_PUBLIC_KEY_SIZE * 2;
- uint8_t temp[MAX_CRYPTO_REQUEST_SIZE];
- int len1 = decrypt_data(public_key, self_secret_key, nonce,
- packet + CRYPTO_SIZE, length - CRYPTO_SIZE, temp);
-
- if (len1 == -1 || len1 == 0) {
- crypto_memzero(temp, MAX_CRYPTO_REQUEST_SIZE);
- return -1;
- }
-
- request_id[0] = temp[0];
- --len1;
- memcpy(data, temp + 1, len1);
- crypto_memzero(temp, MAX_CRYPTO_REQUEST_SIZE);
- return len1;
-}
-
-#define PACKED_NODE_SIZE_IP4 (1 + SIZE_IP4 + sizeof(uint16_t) + CRYPTO_PUBLIC_KEY_SIZE)
-#define PACKED_NODE_SIZE_IP6 (1 + SIZE_IP6 + sizeof(uint16_t) + CRYPTO_PUBLIC_KEY_SIZE)
-
-/* Return packet size of packed node with ip_family on success.
- * Return -1 on failure.
- */
-int packed_node_size(uint8_t ip_family)
-{
- switch (ip_family) {
- case TOX_AF_INET:
- case TCP_INET:
- return PACKED_NODE_SIZE_IP4;
-
- case TOX_AF_INET6:
- case TCP_INET6:
- return PACKED_NODE_SIZE_IP6;
-
- default:
- return -1;
- }
-}
-
-
-/* Packs an IP_Port structure into data of max size length.
- *
- * Returns size of packed IP_Port data on success
- * Return -1 on failure.
- */
-static int pack_ip_port(uint8_t *data, uint16_t length, const IP_Port *ip_port)
-{
- if (data == NULL) {
- return -1;
- }
-
- bool is_ipv4;
- uint8_t net_family;
-
- if (ip_port->ip.family == TOX_AF_INET) {
- // TODO(irungentoo): use functions to convert endianness
- is_ipv4 = true;
- net_family = TOX_AF_INET;
- } else if (ip_port->ip.family == TCP_INET) {
- is_ipv4 = true;
- net_family = TOX_TCP_INET;
- } else if (ip_port->ip.family == TOX_AF_INET6) {
- is_ipv4 = false;
- net_family = TOX_AF_INET6;
- } else if (ip_port->ip.family == TCP_INET6) {
- is_ipv4 = false;
- net_family = TOX_TCP_INET6;
- } else {
- return -1;
- }
-
- if (is_ipv4) {
- uint32_t size = 1 + SIZE_IP4 + sizeof(uint16_t);
-
- if (size > length) {
- return -1;
- }
-
- data[0] = net_family;
- memcpy(data + 1, &ip_port->ip.ip4, SIZE_IP4);
- memcpy(data + 1 + SIZE_IP4, &ip_port->port, sizeof(uint16_t));
- return size;
- } else {
- uint32_t size = 1 + SIZE_IP6 + sizeof(uint16_t);
-
- if (size > length) {
- return -1;
- }
-
- data[0] = net_family;
- memcpy(data + 1, &ip_port->ip.ip6, SIZE_IP6);
- memcpy(data + 1 + SIZE_IP6, &ip_port->port, sizeof(uint16_t));
- return size;
- }
-}
-
-static int DHT_create_packet(const uint8_t public_key[CRYPTO_PUBLIC_KEY_SIZE],
- const uint8_t *shared_key, const uint8_t type, uint8_t *plain, size_t plain_length, uint8_t *packet)
-{
- VLA(uint8_t, encrypted, plain_length + CRYPTO_MAC_SIZE);
- uint8_t nonce[CRYPTO_NONCE_SIZE];
-
- random_nonce(nonce);
-
- int encrypted_length = encrypt_data_symmetric(shared_key, nonce, plain, plain_length, encrypted);
-
- if (encrypted_length == -1) {
- return -1;
- }
-
- packet[0] = type;
- memcpy(packet + 1, public_key, CRYPTO_PUBLIC_KEY_SIZE);
- memcpy(packet + 1 + CRYPTO_PUBLIC_KEY_SIZE, nonce, CRYPTO_NONCE_SIZE);
- memcpy(packet + 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE, encrypted, encrypted_length);
-
- return 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + encrypted_length;
-}
-
-/* Unpack IP_Port structure from data of max size length into ip_port.
- *
- * Return size of unpacked ip_port on success.
- * Return -1 on failure.
- */
-static int unpack_ip_port(IP_Port *ip_port, const uint8_t *data, uint16_t length, uint8_t tcp_enabled)
-{
- if (data == NULL) {
- return -1;
- }
-
- bool is_ipv4;
- uint8_t host_family;
-
- if (data[0] == TOX_AF_INET) {
- is_ipv4 = true;
- host_family = TOX_AF_INET;
- } else if (data[0] == TOX_TCP_INET) {
- if (!tcp_enabled) {
- return -1;
- }
-
- is_ipv4 = true;
- host_family = TCP_INET;
- } else if (data[0] == TOX_AF_INET6) {
- is_ipv4 = false;
- host_family = TOX_AF_INET6;
- } else if (data[0] == TOX_TCP_INET6) {
- if (!tcp_enabled) {
- return -1;
- }
-
- is_ipv4 = false;
- host_family = TCP_INET6;
- } else {
- return -1;
- }
-
- if (is_ipv4) {
- uint32_t size = 1 + SIZE_IP4 + sizeof(uint16_t);
-
- if (size > length) {
- return -1;
- }
-
- ip_port->ip.family = host_family;
- memcpy(&ip_port->ip.ip4, data + 1, SIZE_IP4);
- memcpy(&ip_port->port, data + 1 + SIZE_IP4, sizeof(uint16_t));
- return size;
- } else {
- uint32_t size = 1 + SIZE_IP6 + sizeof(uint16_t);
-
- if (size > length) {
- return -1;
- }
-
- ip_port->ip.family = host_family;
- memcpy(&ip_port->ip.ip6, data + 1, SIZE_IP6);
- memcpy(&ip_port->port, data + 1 + SIZE_IP6, sizeof(uint16_t));
- return size;
- }
-}
-
-/* Pack number of nodes into data of maxlength length.
- *
- * return length of packed nodes on success.
- * return -1 on failure.
- */
-int pack_nodes(uint8_t *data, uint16_t length, const Node_format *nodes, uint16_t number)
-{
- uint32_t packed_length = 0;
-
- for (uint32_t i = 0; i < number && packed_length < length; ++i) {
- int ipp_size = pack_ip_port(data + packed_length, length - packed_length, &nodes[i].ip_port);
-
- if (ipp_size == -1) {
- return -1;
- }
-
- packed_length += ipp_size;
-
- if (packed_length + CRYPTO_PUBLIC_KEY_SIZE > length) {
- return -1;
- }
-
- memcpy(data + packed_length, nodes[i].public_key, CRYPTO_PUBLIC_KEY_SIZE);
- packed_length += CRYPTO_PUBLIC_KEY_SIZE;
-
- uint32_t increment = ipp_size + CRYPTO_PUBLIC_KEY_SIZE;
- assert(increment == PACKED_NODE_SIZE_IP4 || increment == PACKED_NODE_SIZE_IP6);
- }
-
- return packed_length;
-}
-
-/* Unpack data of length into nodes of size max_num_nodes.
- * Put the length of the data processed in processed_data_len.
- * tcp_enabled sets if TCP nodes are expected (true) or not (false).
- *
- * return number of unpacked nodes on success.
- * return -1 on failure.
- */
-int unpack_nodes(Node_format *nodes, uint16_t max_num_nodes, uint16_t *processed_data_len, const uint8_t *data,
- uint16_t length, uint8_t tcp_enabled)
-{
- uint32_t num = 0, len_processed = 0;
-
- while (num < max_num_nodes && len_processed < length) {
- int ipp_size = unpack_ip_port(&nodes[num].ip_port, data + len_processed, length - len_processed, tcp_enabled);
-
- if (ipp_size == -1) {
- return -1;
- }
-
- len_processed += ipp_size;
-
- if (len_processed + CRYPTO_PUBLIC_KEY_SIZE > length) {
- return -1;
- }
-
- memcpy(nodes[num].public_key, data + len_processed, CRYPTO_PUBLIC_KEY_SIZE);
- len_processed += CRYPTO_PUBLIC_KEY_SIZE;
- ++num;
-
- uint32_t increment = ipp_size + CRYPTO_PUBLIC_KEY_SIZE;
- assert(increment == PACKED_NODE_SIZE_IP4 || increment == PACKED_NODE_SIZE_IP6);
- }
-
- if (processed_data_len) {
- *processed_data_len = len_processed;
- }
-
- return num;
-}
-
-/* Find index of ##type with public_key equal to pk.
- *
- * return index or UINT32_MAX if not found.
- */
-#define INDEX_OF_PK \
- for (uint32_t i = 0; i < size; i++) { \
- if (id_equal(array[i].public_key, pk)) { \
- return i; \
- } \
- } \
- \
- return UINT32_MAX;
-
-static uint32_t index_of_client_pk(const Client_data *array, uint32_t size, const uint8_t *pk)
-{
- INDEX_OF_PK
-}
-
-static uint32_t index_of_friend_pk(const DHT_Friend *array, uint32_t size, const uint8_t *pk)
-{
- INDEX_OF_PK
-}
-
-static uint32_t index_of_node_pk(const Node_format *array, uint32_t size, const uint8_t *pk)
-{
- INDEX_OF_PK
-}
-
-/* Find index of Client_data with ip_port equal to param ip_port.
- *
- * return index or UINT32_MAX if not found.
- */
-static uint32_t index_of_client_ip_port(const Client_data *array, uint32_t size, const IP_Port *ip_port)
-{
- for (uint32_t i = 0; i < size; ++i) {
- if (ip_port->ip.family == TOX_AF_INET && ipport_equal(&array[i].assoc4.ip_port, ip_port) ||
- ip_port->ip.family == TOX_AF_INET6 && ipport_equal(&array[i].assoc6.ip_port, ip_port)) {
- return i;
- }
- }
-
- return UINT32_MAX;
-}
-
-/* Update ip_port of client if it's needed.
- */
-static void update_client(Logger *log, int index, Client_data *client, IP_Port ip_port)
-{
- IPPTsPng *assoc;
- int ip_version;
-
- if (ip_port.ip.family == TOX_AF_INET) {
- assoc = &client->assoc4;
- ip_version = 4;
- } else if (ip_port.ip.family == TOX_AF_INET6) {
- assoc = &client->assoc6;
- ip_version = 6;
- } else {
- return;
- }
-
- if (!ipport_equal(&assoc->ip_port, &ip_port)) {
- char ip_str[IP_NTOA_LEN];
- LOGGER_TRACE(log, "coipil[%u]: switching ipv%d from %s:%u to %s:%u",
- index, ip_version,
- ip_ntoa(&assoc->ip_port.ip, ip_str, sizeof(ip_str)),
- net_ntohs(assoc->ip_port.port),
- ip_ntoa(&ip_port.ip, ip_str, sizeof(ip_str)),
- net_ntohs(ip_port.port));
- }
-
- if (LAN_ip(assoc->ip_port.ip) != 0 && LAN_ip(ip_port.ip) == 0) {
- return;
- }
-
- assoc->ip_port = ip_port;
- assoc->timestamp = unix_time();
-}
-
-/* Check if client with public_key is already in list of length length.
- * If it is then set its corresponding timestamp to current time.
- * If the id is already in the list with a different ip_port, update it.
- * TODO(irungentoo): Maybe optimize this.
- *
- * return True(1) or False(0)
- */
-static int client_or_ip_port_in_list(Logger *log, Client_data *list, uint16_t length, const uint8_t *public_key,
- IP_Port ip_port)
-{
- uint64_t temp_time = unix_time();
- uint32_t index = index_of_client_pk(list, length, public_key);
-
- /* if public_key is in list, find it and maybe overwrite ip_port */
- if (index != UINT32_MAX) {
- update_client(log, index, &list[index], ip_port);
- return 1;
- }
-
- /* public_key not in list yet: see if we can find an identical ip_port, in
- * that case we kill the old public_key by overwriting it with the new one
- * TODO(irungentoo): maybe we SHOULDN'T do that if that public_key is in a friend_list
- * and the one who is the actual friend's public_key/address set?
- * MAYBE: check the other address, if valid, don't nuke? */
- index = index_of_client_ip_port(list, length, &ip_port);
-
- if (index == UINT32_MAX) {
- return 0;
- }
-
- IPPTsPng *assoc;
- int ip_version;
-
- if (ip_port.ip.family == TOX_AF_INET) {
- assoc = &list[index].assoc4;
- ip_version = 4;
- } else {
- assoc = &list[index].assoc6;
- ip_version = 6;
- }
-
- /* Initialize client timestamp. */
- assoc->timestamp = temp_time;
- memcpy(list[index].public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
-
- LOGGER_DEBUG(log, "coipil[%u]: switching public_key (ipv%d)", index, ip_version);
-
- /* kill the other address, if it was set */
- memset(assoc, 0, sizeof(IPPTsPng));
- return 1;
-}
-
-/* Add node to the node list making sure only the nodes closest to cmp_pk are in the list.
- */
-bool add_to_list(Node_format *nodes_list, unsigned int length, const uint8_t *pk, IP_Port ip_port,
- const uint8_t *cmp_pk)
-{
- uint8_t pk_bak[CRYPTO_PUBLIC_KEY_SIZE];
- IP_Port ip_port_bak;
-
- for (size_t i = 0; i < length; ++i) {
- if (id_closest(cmp_pk, nodes_list[i].public_key, pk) == 2) {
- memcpy(pk_bak, nodes_list[i].public_key, CRYPTO_PUBLIC_KEY_SIZE);
- ip_port_bak = nodes_list[i].ip_port;
- memcpy(nodes_list[i].public_key, pk, CRYPTO_PUBLIC_KEY_SIZE);
- nodes_list[i].ip_port = ip_port;
-
- if (i != (length - 1)) {
- add_to_list(nodes_list, length, pk_bak, ip_port_bak, cmp_pk);
- }
-
- return 1;
- }
- }
-
- return 0;
-}
-
-/* TODO(irungentoo): change this to 7 when done*/
-#define HARDENING_ALL_OK 2
-/* return 0 if not.
- * return 1 if route request are ok
- * return 2 if it responds to send node packets correctly
- * return 4 if it can test other nodes correctly
- * return HARDENING_ALL_OK if all ok.
- */
-static uint8_t hardening_correct(const Hardening *h)
-{
- return h->routes_requests_ok + (h->send_nodes_ok << 1) + (h->testing_requests << 2);
-}
-/*
- * helper for get_close_nodes(). argument list is a monster :D
- */
-static void get_close_nodes_inner(const uint8_t *public_key, Node_format *nodes_list,
- Family sa_family, const Client_data *client_list, uint32_t client_list_length,
- uint32_t *num_nodes_ptr, uint8_t is_LAN, uint8_t want_good)
-{
- if ((sa_family != TOX_AF_INET) && (sa_family != TOX_AF_INET6) && (sa_family != 0)) {
- return;
- }
-
- uint32_t num_nodes = *num_nodes_ptr;
-
- for (uint32_t i = 0; i < client_list_length; i++) {
- const Client_data *client = &client_list[i];
-
- /* node already in list? */
- if (index_of_node_pk(nodes_list, MAX_SENT_NODES, client->public_key) != UINT32_MAX) {
- continue;
- }
-
- const IPPTsPng *ipptp = NULL;
-
- if (sa_family == TOX_AF_INET) {
- ipptp = &client->assoc4;
- } else if (sa_family == TOX_AF_INET6) {
- ipptp = &client->assoc6;
- } else if (client->assoc4.timestamp >= client->assoc6.timestamp) {
- ipptp = &client->assoc4;
- } else {
- ipptp = &client->assoc6;
- }
-
- /* node not in a good condition? */
- if (is_timeout(ipptp->timestamp, BAD_NODE_TIMEOUT)) {
- continue;
- }
-
- /* don't send LAN ips to non LAN peers */
- if (LAN_ip(ipptp->ip_port.ip) == 0 && !is_LAN) {
- continue;
- }
-
- if (LAN_ip(ipptp->ip_port.ip) != 0 && want_good && hardening_correct(&ipptp->hardening) != HARDENING_ALL_OK
- && !id_equal(public_key, client->public_key)) {
- continue;
- }
-
- if (num_nodes < MAX_SENT_NODES) {
- memcpy(nodes_list[num_nodes].public_key, client->public_key, CRYPTO_PUBLIC_KEY_SIZE);
- nodes_list[num_nodes].ip_port = ipptp->ip_port;
- num_nodes++;
- } else {
- add_to_list(nodes_list, MAX_SENT_NODES, client->public_key, ipptp->ip_port, public_key);
- }
- }
-
- *num_nodes_ptr = num_nodes;
-}
-
-/* Find MAX_SENT_NODES nodes closest to the public_key for the send nodes request:
- * put them in the nodes_list and return how many were found.
- *
- * TODO(irungentoo): For the love of based <your favorite deity, in doubt use
- * "love"> make this function cleaner and much more efficient.
- *
- * want_good : do we want only good nodes as checked with the hardening returned or not?
- */
-static int get_somewhat_close_nodes(const DHT *dht, const uint8_t *public_key, Node_format *nodes_list,
- Family sa_family, uint8_t is_LAN, uint8_t want_good)
-{
- uint32_t num_nodes = 0;
- get_close_nodes_inner(public_key, nodes_list, sa_family,
- dht->close_clientlist, LCLIENT_LIST, &num_nodes, is_LAN, 0);
-
- /* TODO(irungentoo): uncomment this when hardening is added to close friend clients */
-#if 0
-
- for (uint32_t i = 0; i < dht->num_friends; ++i) {
- get_close_nodes_inner(dht, public_key, nodes_list, sa_family,
- dht->friends_list[i].client_list, MAX_FRIEND_CLIENTS,
- &num_nodes, is_LAN, want_good);
- }
-
-#endif
-
- for (uint32_t i = 0; i < dht->num_friends; ++i) {
- get_close_nodes_inner(public_key, nodes_list, sa_family,
- dht->friends_list[i].client_list, MAX_FRIEND_CLIENTS,
- &num_nodes, is_LAN, 0);
- }
-
- return num_nodes;
-}
-
-int get_close_nodes(const DHT *dht, const uint8_t *public_key, Node_format *nodes_list, Family sa_family,
- uint8_t is_LAN, uint8_t want_good)
-{
- memset(nodes_list, 0, MAX_SENT_NODES * sizeof(Node_format));
- return get_somewhat_close_nodes(dht, public_key, nodes_list, sa_family, is_LAN, want_good);
-}
-
-typedef struct {
- const uint8_t *base_public_key;
- Client_data entry;
-} DHT_Cmp_data;
-
-static int cmp_dht_entry(const void *a, const void *b)
-{
- DHT_Cmp_data cmp1, cmp2;
- memcpy(&cmp1, a, sizeof(DHT_Cmp_data));
- memcpy(&cmp2, b, sizeof(DHT_Cmp_data));
- Client_data entry1 = cmp1.entry;
- Client_data entry2 = cmp2.entry;
- const uint8_t *cmp_public_key = cmp1.base_public_key;
-
-#define ASSOC_TIMEOUT(assoc) is_timeout((assoc).timestamp, BAD_NODE_TIMEOUT)
-
- bool t1 = ASSOC_TIMEOUT(entry1.assoc4) && ASSOC_TIMEOUT(entry1.assoc6);
- bool t2 = ASSOC_TIMEOUT(entry2.assoc4) && ASSOC_TIMEOUT(entry2.assoc6);
-
- if (t1 && t2) {
- return 0;
- }
-
- if (t1) {
- return -1;
- }
-
- if (t2) {
- return 1;
- }
-
-#define INCORRECT_HARDENING(assoc) hardening_correct(&(assoc).hardening) != HARDENING_ALL_OK
-
- t1 = INCORRECT_HARDENING(entry1.assoc4) && INCORRECT_HARDENING(entry1.assoc6);
- t2 = INCORRECT_HARDENING(entry2.assoc4) && INCORRECT_HARDENING(entry2.assoc6);
-
- if (t1 && !t2) {
- return -1;
- }
-
- if (!t1 && t2) {
- return 1;
- }
-
- int close = id_closest(cmp_public_key, entry1.public_key, entry2.public_key);
-
- if (close == 1) {
- return 1;
- }
-
- if (close == 2) {
- return -1;
- }
-
- return 0;
-}
-
-/* Is it ok to store node with public_key in client.
- *
- * return 0 if node can't be stored.
- * return 1 if it can.
- */
-static unsigned int store_node_ok(const Client_data *client, const uint8_t *public_key, const uint8_t *comp_public_key)
-{
- return is_timeout(client->assoc4.timestamp, BAD_NODE_TIMEOUT) &&
- is_timeout(client->assoc6.timestamp, BAD_NODE_TIMEOUT) ||
- id_closest(comp_public_key, client->public_key, public_key) == 2;
-}
-
-static void sort_client_list(Client_data *list, unsigned int length, const uint8_t *comp_public_key)
-{
- // Pass comp_public_key to qsort with each Client_data entry, so the
- // comparison function can use it as the base of comparison.
- VLA(DHT_Cmp_data, cmp_list, length);
-
- for (uint32_t i = 0; i < length; i++) {
- cmp_list[i].base_public_key = comp_public_key;
- cmp_list[i].entry = list[i];
- }
-
- qsort(cmp_list, length, sizeof(DHT_Cmp_data), cmp_dht_entry);
-
- for (uint32_t i = 0; i < length; i++) {
- list[i] = cmp_list[i].entry;
- }
-}
-
-static void update_client_with_reset(Client_data *client, const IP_Port *ip_port)
-{
- IPPTsPng *ipptp_write = NULL;
- IPPTsPng *ipptp_clear = NULL;
-
- if (ip_port->ip.family == TOX_AF_INET) {
- ipptp_write = &client->assoc4;
- ipptp_clear = &client->assoc6;
- } else {
- ipptp_write = &client->assoc6;
- ipptp_clear = &client->assoc4;
- }
-
- ipptp_write->ip_port = *ip_port;
- ipptp_write->timestamp = unix_time();
-
- ip_reset(&ipptp_write->ret_ip_port.ip);
- ipptp_write->ret_ip_port.port = 0;
- ipptp_write->ret_timestamp = 0;
-
- /* zero out other address */
- memset(ipptp_clear, 0, sizeof(*ipptp_clear));
-}
-
-/* Replace a first bad (or empty) node with this one
- * or replace a possibly bad node (tests failed or not done yet)
- * that is further than any other in the list
- * from the comp_public_key
- * or replace a good node that is further
- * than any other in the list from the comp_public_key
- * and further than public_key.
- *
- * Do not replace any node if the list has no bad or possibly bad nodes
- * and all nodes in the list are closer to comp_public_key
- * than public_key.
- *
- * returns True(1) when the item was stored, False(0) otherwise */
-static int replace_all(Client_data *list,
- uint16_t length,
- const uint8_t *public_key,
- IP_Port ip_port,
- const uint8_t *comp_public_key)
-{
- if ((ip_port.ip.family != TOX_AF_INET) && (ip_port.ip.family != TOX_AF_INET6)) {
- return 0;
- }
-
- if (!store_node_ok(&list[1], public_key, comp_public_key) &&
- !store_node_ok(&list[0], public_key, comp_public_key)) {
- return 0;
- }
-
- sort_client_list(list, length, comp_public_key);
-
- Client_data *client = &list[0];
- id_copy(client->public_key, public_key);
-
- update_client_with_reset(client, &ip_port);
- return 1;
-}
-
-/* Add node to close list.
- *
- * simulate is set to 1 if we want to check if a node can be added to the list without adding it.
- *
- * return -1 on failure.
- * return 0 on success.
- */
-static int add_to_close(DHT *dht, const uint8_t *public_key, IP_Port ip_port, bool simulate)
-{
- unsigned int index = bit_by_bit_cmp(public_key, dht->self_public_key);
-
- if (index >= LCLIENT_LENGTH) {
- index = LCLIENT_LENGTH - 1;
- }
-
- for (uint32_t i = 0; i < LCLIENT_NODES; ++i) {
- /* TODO(iphydf): write bounds checking test to catch the case that
- * index is left as >= LCLIENT_LENGTH */
- Client_data *client = &dht->close_clientlist[(index * LCLIENT_NODES) + i];
-
- if (!is_timeout(client->assoc4.timestamp, BAD_NODE_TIMEOUT) ||
- !is_timeout(client->assoc6.timestamp, BAD_NODE_TIMEOUT)) {
- continue;
- }
-
- if (simulate) {
- return 0;
- }
-
- id_copy(client->public_key, public_key);
- update_client_with_reset(client, &ip_port);
- return 0;
- }
-
- return -1;
-}
-
-/* Return 1 if node can be added to close list, 0 if it can't.
- */
-bool node_addable_to_close_list(DHT *dht, const uint8_t *public_key, IP_Port ip_port)
-{
- return add_to_close(dht, public_key, ip_port, 1) == 0;
-}
-
-static bool is_pk_in_client_list(Client_data *list, unsigned int client_list_length, const uint8_t *public_key,
- IP_Port ip_port)
-{
- uint32_t index = index_of_client_pk(list, client_list_length, public_key);
-
- if (index == UINT32_MAX) {
- return 0;
- }
-
- const IPPTsPng *assoc = ip_port.ip.family == TOX_AF_INET ?
- &list[index].assoc4 :
- &list[index].assoc6;
-
- return !is_timeout(assoc->timestamp, BAD_NODE_TIMEOUT);
-}
-
-static bool is_pk_in_close_list(DHT *dht, const uint8_t *public_key, IP_Port ip_port)
-{
- unsigned int index = bit_by_bit_cmp(public_key, dht->self_public_key);
-
- if (index >= LCLIENT_LENGTH) {
- index = LCLIENT_LENGTH - 1;
- }
-
- return is_pk_in_client_list(dht->close_clientlist + index * LCLIENT_NODES, LCLIENT_NODES, public_key, ip_port);
-}
-
-/* Check if the node obtained with a get_nodes with public_key should be pinged.
- * NOTE: for best results call it after addto_lists;
- *
- * return 0 if the node should not be pinged.
- * return 1 if it should.
- */
-static unsigned int ping_node_from_getnodes_ok(DHT *dht, const uint8_t *public_key, IP_Port ip_port)
-{
- bool ret = 0;
-
- if (add_to_close(dht, public_key, ip_port, 1) == 0) {
- ret = 1;
- }
-
- unsigned int *num = &dht->num_to_bootstrap;
- uint32_t index = index_of_node_pk(dht->to_bootstrap, *num, public_key);
- bool in_close_list = is_pk_in_close_list(dht, public_key, ip_port);
-
- if (ret && index == UINT32_MAX && !in_close_list) {
- if (*num < MAX_CLOSE_TO_BOOTSTRAP_NODES) {
- memcpy(dht->to_bootstrap[*num].public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
- dht->to_bootstrap[*num].ip_port = ip_port;
- ++*num;
- } else {
- // TODO(irungentoo): ipv6 vs v4
- add_to_list(dht->to_bootstrap, MAX_CLOSE_TO_BOOTSTRAP_NODES, public_key, ip_port, dht->self_public_key);
- }
- }
-
- for (uint32_t i = 0; i < dht->num_friends; ++i) {
- bool store_ok = 0;
-
- DHT_Friend *dht_friend = &dht->friends_list[i];
-
- if (store_node_ok(&dht_friend->client_list[1], public_key, dht_friend->public_key)) {
- store_ok = 1;
- }
-
- if (store_node_ok(&dht_friend->client_list[0], public_key, dht_friend->public_key)) {
- store_ok = 1;
- }
-
- unsigned int *friend_num = &dht_friend->num_to_bootstrap;
- const uint32_t index = index_of_node_pk(dht_friend->to_bootstrap, *friend_num, public_key);
- const bool pk_in_list = is_pk_in_client_list(dht_friend->client_list, MAX_FRIEND_CLIENTS, public_key, ip_port);
-
- if (store_ok && index == UINT32_MAX && !pk_in_list) {
- if (*friend_num < MAX_SENT_NODES) {
- Node_format *format = &dht_friend->to_bootstrap[*friend_num];
- memcpy(format->public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
- format->ip_port = ip_port;
- ++*friend_num;
- } else {
- add_to_list(dht_friend->to_bootstrap, MAX_SENT_NODES, public_key, ip_port, dht_friend->public_key);
- }
-
- ret = 1;
- }
- }
-
- return ret;
-}
-
-/* Attempt to add client with ip_port and public_key to the friends client list
- * and close_clientlist.
- *
- * returns 1+ if the item is used in any list, 0 else
- */
-uint32_t addto_lists(DHT *dht, IP_Port ip_port, const uint8_t *public_key)
-{
- uint32_t used = 0;
-
- /* convert IPv4-in-IPv6 to IPv4 */
- if ((ip_port.ip.family == TOX_AF_INET6) && IPV6_IPV4_IN_V6(ip_port.ip.ip6)) {
- ip_port.ip.family = TOX_AF_INET;
- ip_port.ip.ip4.uint32 = ip_port.ip.ip6.uint32[3];
- }
-
- /* NOTE: Current behavior if there are two clients with the same id is
- * to replace the first ip by the second.
- */
- const bool in_close_list = client_or_ip_port_in_list(dht->log, dht->close_clientlist,
- LCLIENT_LIST, public_key, ip_port);
-
- /* add_to_close should be called only if !in_list (don't extract to variable) */
- if (in_close_list || add_to_close(dht, public_key, ip_port, 0)) {
- used++;
- }
-
- DHT_Friend *friend_foundip = 0;
-
- for (uint32_t i = 0; i < dht->num_friends; ++i) {
- const bool in_list = client_or_ip_port_in_list(dht->log, dht->friends_list[i].client_list,
- MAX_FRIEND_CLIENTS, public_key, ip_port);
-
- /* replace_all should be called only if !in_list (don't extract to variable) */
- if (in_list || replace_all(dht->friends_list[i].client_list, MAX_FRIEND_CLIENTS, public_key,
- ip_port, dht->friends_list[i].public_key)) {
- DHT_Friend *dht_friend = &dht->friends_list[i];
-
- if (id_equal(public_key, dht_friend->public_key)) {
- friend_foundip = dht_friend;
- }
-
- used++;
- }
- }
-
- if (!friend_foundip) {
- return used;
- }
-
- for (uint32_t i = 0; i < friend_foundip->lock_count; ++i) {
- if (friend_foundip->callbacks[i].ip_callback) {
- friend_foundip->callbacks[i].ip_callback(friend_foundip->callbacks[i].data,
- friend_foundip->callbacks[i].number, ip_port);
- }
- }
-
- return used;
-}
-
-static bool update_client_data(Client_data *array, size_t size, IP_Port ip_port, const uint8_t *pk)
-{
- uint64_t temp_time = unix_time();
- uint32_t index = index_of_client_pk(array, size, pk);
-
- if (index == UINT32_MAX) {
- return false;
- }
-
- Client_data *data = &array[index];
- IPPTsPng *assoc;
-
- if (ip_port.ip.family == TOX_AF_INET) {
- assoc = &data->assoc4;
- } else if (ip_port.ip.family == TOX_AF_INET6) {
- assoc = &data->assoc6;
- } else {
- return true;
- }
-
- assoc->ret_ip_port = ip_port;
- assoc->ret_timestamp = temp_time;
- return true;
-}
-
-/* If public_key is a friend or us, update ret_ip_port
- * nodepublic_key is the id of the node that sent us this info.
- */
-static void returnedip_ports(DHT *dht, IP_Port ip_port, const uint8_t *public_key, const uint8_t *nodepublic_key)
-{
- /* convert IPv4-in-IPv6 to IPv4 */
- if ((ip_port.ip.family == TOX_AF_INET6) && IPV6_IPV4_IN_V6(ip_port.ip.ip6)) {
- ip_port.ip.family = TOX_AF_INET;
- ip_port.ip.ip4.uint32 = ip_port.ip.ip6.uint32[3];
- }
-
- if (id_equal(public_key, dht->self_public_key)) {
- update_client_data(dht->close_clientlist, LCLIENT_LIST, ip_port, nodepublic_key);
- return;
- }
-
- for (uint32_t i = 0; i < dht->num_friends; ++i) {
- if (id_equal(public_key, dht->friends_list[i].public_key)) {
- Client_data *client_list = dht->friends_list[i].client_list;
-
- if (update_client_data(client_list, MAX_FRIEND_CLIENTS, ip_port, nodepublic_key)) {
- return;
- }
- }
- }
-}
-
-/* Send a getnodes request.
- sendback_node is the node that it will send back the response to (set to NULL to disable this) */
-static int getnodes(DHT *dht, IP_Port ip_port, const uint8_t *public_key, const uint8_t *client_id,
- const Node_format *sendback_node)
-{
- /* Check if packet is going to be sent to ourself. */
- if (id_equal(public_key, dht->self_public_key)) {
- return -1;
- }
-
- uint8_t plain_message[sizeof(Node_format) * 2] = {0};
-
- Node_format receiver;
- memcpy(receiver.public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
- receiver.ip_port = ip_port;
- memcpy(plain_message, &receiver, sizeof(receiver));
-
- uint64_t ping_id = 0;
-
- if (sendback_node != NULL) {
- memcpy(plain_message + sizeof(receiver), sendback_node, sizeof(Node_format));
- ping_id = ping_array_add(&dht->dht_harden_ping_array, plain_message, sizeof(plain_message));
- } else {
- ping_id = ping_array_add(&dht->dht_ping_array, plain_message, sizeof(receiver));
- }
-
- if (ping_id == 0) {
- return -1;
- }
-
- uint8_t plain[CRYPTO_PUBLIC_KEY_SIZE + sizeof(ping_id)];
- uint8_t data[1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + sizeof(plain) + CRYPTO_MAC_SIZE];
-
- memcpy(plain, client_id, CRYPTO_PUBLIC_KEY_SIZE);
- memcpy(plain + CRYPTO_PUBLIC_KEY_SIZE, &ping_id, sizeof(ping_id));
-
- uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
- DHT_get_shared_key_sent(dht, shared_key, public_key);
-
- int len = DHT_create_packet(dht->self_public_key, shared_key, NET_PACKET_GET_NODES,
- plain, sizeof(plain), data);
-
- if (len != sizeof(data)) {
- return -1;
- }
-
- return sendpacket(dht->net, ip_port, data, len);
-}
-
-/* Send a send nodes response: message for IPv6 nodes */
-static int sendnodes_ipv6(const DHT *dht, IP_Port ip_port, const uint8_t *public_key, const uint8_t *client_id,
- const uint8_t *sendback_data, uint16_t length, const uint8_t *shared_encryption_key)
-{
- /* Check if packet is going to be sent to ourself. */
- if (id_equal(public_key, dht->self_public_key)) {
- return -1;
- }
-
- if (length != sizeof(uint64_t)) {
- return -1;
- }
-
- size_t Node_format_size = sizeof(Node_format);
-
- Node_format nodes_list[MAX_SENT_NODES];
- uint32_t num_nodes = get_close_nodes(dht, client_id, nodes_list, 0, LAN_ip(ip_port.ip) == 0, 1);
-
- VLA(uint8_t, plain, 1 + Node_format_size * MAX_SENT_NODES + length);
-
- int nodes_length = 0;
-
- if (num_nodes) {
- nodes_length = pack_nodes(plain + 1, Node_format_size * MAX_SENT_NODES, nodes_list, num_nodes);
-
- if (nodes_length <= 0) {
- return -1;
- }
- }
-
- plain[0] = num_nodes;
- memcpy(plain + 1 + nodes_length, sendback_data, length);
-
- const uint32_t crypto_size = 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + CRYPTO_MAC_SIZE;
- VLA(uint8_t, data, 1 + nodes_length + length + crypto_size);
-
- int len = DHT_create_packet(dht->self_public_key, shared_encryption_key, NET_PACKET_SEND_NODES_IPV6,
- plain, 1 + nodes_length + length, data);
-
- if (len != SIZEOF_VLA(data)) {
- return -1;
- }
-
- return sendpacket(dht->net, ip_port, data, len);
-}
-
-#define CRYPTO_NODE_SIZE (CRYPTO_PUBLIC_KEY_SIZE + sizeof(uint64_t))
-
-static int handle_getnodes(void *object, IP_Port source, const uint8_t *packet, uint16_t length, void *userdata)
-{
- if (length != (CRYPTO_SIZE + CRYPTO_MAC_SIZE + sizeof(uint64_t))) {
- return 1;
- }
-
- DHT *dht = (DHT *)object;
-
- /* Check if packet is from ourself. */
- if (id_equal(packet + 1, dht->self_public_key)) {
- return 1;
- }
-
- uint8_t plain[CRYPTO_NODE_SIZE];
- uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
-
- DHT_get_shared_key_recv(dht, shared_key, packet + 1);
- int len = decrypt_data_symmetric(shared_key,
- packet + 1 + CRYPTO_PUBLIC_KEY_SIZE,
- packet + 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE,
- CRYPTO_NODE_SIZE + CRYPTO_MAC_SIZE,
- plain);
-
- if (len != CRYPTO_NODE_SIZE) {
- return 1;
- }
-
- sendnodes_ipv6(dht, source, packet + 1, plain, plain + CRYPTO_PUBLIC_KEY_SIZE, sizeof(uint64_t), shared_key);
-
- add_to_ping(dht->ping, packet + 1, source);
-
- return 0;
-}
-/* return 0 if no
- return 1 if yes */
-static uint8_t sent_getnode_to_node(DHT *dht, const uint8_t *public_key, IP_Port node_ip_port, uint64_t ping_id,
- Node_format *sendback_node)
-{
- uint8_t data[sizeof(Node_format) * 2];
-
- if (ping_array_check(data, sizeof(data), &dht->dht_ping_array, ping_id) == sizeof(Node_format)) {
- memset(sendback_node, 0, sizeof(Node_format));
- } else if (ping_array_check(data, sizeof(data), &dht->dht_harden_ping_array, ping_id) == sizeof(data)) {
- memcpy(sendback_node, data + sizeof(Node_format), sizeof(Node_format));
- } else {
- return 0;
- }
-
- Node_format test;
- memcpy(&test, data, sizeof(Node_format));
-
- if (!ipport_equal(&test.ip_port, &node_ip_port) || !id_equal(test.public_key, public_key)) {
- return 0;
- }
-
- return 1;
-}
-
-/* Function is needed in following functions. */
-static int send_hardening_getnode_res(const DHT *dht, const Node_format *sendto, const uint8_t *queried_client_id,
- const uint8_t *nodes_data, uint16_t nodes_data_length);
-
-static int handle_sendnodes_core(void *object, IP_Port source, const uint8_t *packet, uint16_t length,
- Node_format *plain_nodes, uint16_t size_plain_nodes, uint32_t *num_nodes_out)
-{
- DHT *dht = (DHT *)object;
- uint32_t cid_size = 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE + 1 + sizeof(uint64_t) + CRYPTO_MAC_SIZE;
-
- if (length < cid_size) { /* too short */
- return 1;
- }
-
- uint32_t data_size = length - cid_size;
-
- if (data_size == 0) {
- return 1;
- }
-
- if (data_size > sizeof(Node_format) * MAX_SENT_NODES) { /* invalid length */
- return 1;
- }
-
- VLA(uint8_t, plain, 1 + data_size + sizeof(uint64_t));
- uint8_t shared_key[CRYPTO_SHARED_KEY_SIZE];
- DHT_get_shared_key_sent(dht, shared_key, packet + 1);
- int len = decrypt_data_symmetric(
- shared_key,
- packet + 1 + CRYPTO_PUBLIC_KEY_SIZE,
- packet + 1 + CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_NONCE_SIZE,
- 1 + data_size + sizeof(uint64_t) + CRYPTO_MAC_SIZE,
- plain);
-
- if ((unsigned int)len != SIZEOF_VLA(plain)) {
- return 1;
- }
-
- if (plain[0] > size_plain_nodes) {
- return 1;
- }
-
- Node_format sendback_node;
-
- uint64_t ping_id;
- memcpy(&ping_id, plain + 1 + data_size, sizeof(ping_id));
-
- if (!sent_getnode_to_node(dht, packet + 1, source, ping_id, &sendback_node)) {
- return 1;
- }
-
- uint16_t length_nodes = 0;
- int num_nodes = unpack_nodes(plain_nodes, plain[0], &length_nodes, plain + 1, data_size, 0);
-
- if (length_nodes != data_size) {
- return 1;
- }
-
- if (num_nodes != plain[0]) {
- return 1;
- }
-
- if (num_nodes < 0) {
- return 1;
- }
-
- /* store the address the *request* was sent to */
- addto_lists(dht, source, packet + 1);
-
- *num_nodes_out = num_nodes;
-
- send_hardening_getnode_res(dht, &sendback_node, packet + 1, plain + 1, data_size);
- return 0;
-}
-
-static int handle_sendnodes_ipv6(void *object, IP_Port source, const uint8_t *packet, uint16_t length, void *userdata)
-{
- DHT *dht = (DHT *)object;
- Node_format plain_nodes[MAX_SENT_NODES];
- uint32_t num_nodes;
-
- if (handle_sendnodes_core(object, source, packet, length, plain_nodes, MAX_SENT_NODES, &num_nodes)) {
- return 1;
- }
-
- if (num_nodes == 0) {
- return 0;
- }
-
- for (uint32_t i = 0; i < num_nodes; i++) {
- if (ipport_isset(&plain_nodes[i].ip_port)) {
- ping_node_from_getnodes_ok(dht, plain_nodes[i].public_key, plain_nodes[i].ip_port);
- returnedip_ports(dht, plain_nodes[i].ip_port, plain_nodes[i].public_key, packet + 1);
- }
- }
-
- return 0;
-}
-
-/*----------------------------------------------------------------------------------*/
-/*------------------------END of packet handling functions--------------------------*/
-
-int DHT_addfriend(DHT *dht, const uint8_t *public_key, void (*ip_callback)(void *data, int32_t number, IP_Port),
- void *data, int32_t number, uint16_t *lock_count)
-{
- uint32_t friend_num = index_of_friend_pk(dht->friends_list, dht->num_friends, public_key);
-
- uint16_t lock_num;
-
- if (friend_num != UINT32_MAX) { /* Is friend already in DHT? */
- DHT_Friend *dht_friend = &dht->friends_list[friend_num];
-
- if (dht_friend->lock_count == DHT_FRIEND_MAX_LOCKS) {
- return -1;
- }
-
- lock_num = dht_friend->lock_count;
- ++dht_friend->lock_count;
- dht_friend->callbacks[lock_num].ip_callback = ip_callback;
- dht_friend->callbacks[lock_num].data = data;
- dht_friend->callbacks[lock_num].number = number;
-
- if (lock_count) {
- *lock_count = lock_num + 1;
- }
-
- return 0;
- }
-
- DHT_Friend *temp = (DHT_Friend *)realloc(dht->friends_list, sizeof(DHT_Friend) * (dht->num_friends + 1));
-
- if (temp == NULL) {
- return -1;
- }
-
- dht->friends_list = temp;
- DHT_Friend *dht_friend = &dht->friends_list[dht->num_friends];
- memset(dht_friend, 0, sizeof(DHT_Friend));
- memcpy(dht_friend->public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
-
- dht_friend->nat.NATping_id = random_64b();
- ++dht->num_friends;
-
- lock_num = dht_friend->lock_count;
- ++dht_friend->lock_count;
- dht_friend->callbacks[lock_num].ip_callback = ip_callback;
- dht_friend->callbacks[lock_num].data = data;
- dht_friend->callbacks[lock_num].number = number;
-
- if (lock_count) {
- *lock_count = lock_num + 1;
- }
-
- dht_friend->num_to_bootstrap = get_close_nodes(dht, dht_friend->public_key, dht_friend->to_bootstrap, 0, 1, 0);
-
- return 0;
-}
-
-int DHT_delfriend(DHT *dht, const uint8_t *public_key, uint16_t lock_count)
-{
- uint32_t friend_num = index_of_friend_pk(dht->friends_list, dht->num_friends, public_key);
-
- if (friend_num == UINT32_MAX) {
- return -1;
- }
-
- DHT_Friend *dht_friend = &dht->friends_list[friend_num];
- --dht_friend->lock_count;
-
- if (dht_friend->lock_count && lock_count) { /* DHT friend is still in use.*/
- --lock_count;
- dht_friend->callbacks[lock_count].ip_callback = NULL;
- dht_friend->callbacks[lock_count].data = NULL;
- dht_friend->callbacks[lock_count].number = 0;
- return 0;
- }
-
- --dht->num_friends;
-
- if (dht->num_friends != friend_num) {
- memcpy(&dht->friends_list[friend_num],
- &dht->friends_list[dht->num_friends],
- sizeof(DHT_Friend));
- }
-
- if (dht->num_friends == 0) {
- free(dht->friends_list);
- dht->friends_list = NULL;
- return 0;
- }
-
- DHT_Friend *temp = (DHT_Friend *)realloc(dht->friends_list, sizeof(DHT_Friend) * (dht->num_friends));
-
- if (temp == NULL) {
- return -1;
- }
-
- dht->friends_list = temp;
- return 0;
-}
-
-/* TODO(irungentoo): Optimize this. */
-int DHT_getfriendip(const DHT *dht, const uint8_t *public_key, IP_Port *ip_port)
-{
- ip_reset(&ip_port->ip);
- ip_port->port = 0;
-
- uint32_t friend_index = index_of_friend_pk(dht->friends_list, dht->num_friends, public_key);
-
- if (friend_index == UINT32_MAX) {
- return -1;
- }
-
- DHT_Friend *frnd = &dht->friends_list[friend_index];
- uint32_t client_index = index_of_client_pk(frnd->client_list, MAX_FRIEND_CLIENTS, public_key);
-
- if (client_index == -1) {
- return 0;
- }
-
- Client_data *client = &frnd->client_list[client_index];
- IPPTsPng *assocs[ASSOC_COUNT] = { &client->assoc6, &client->assoc4 };
-
- for (size_t i = 0; i < ASSOC_COUNT; i++) {
- IPPTsPng *assoc = assocs[i];
-
- if (!is_timeout(assoc->timestamp, BAD_NODE_TIMEOUT)) {
- *ip_port = assoc->ip_port;
- return 1;
- }
- }
-
- return -1;
-}
-
-/* returns number of nodes not in kill-timeout */
-static uint8_t do_ping_and_sendnode_requests(DHT *dht, uint64_t *lastgetnode, const uint8_t *public_key,
- Client_data *list, uint32_t list_count, uint32_t *bootstrap_times, bool sortable)
-{
- uint8_t not_kill = 0;
- uint64_t temp_time = unix_time();
-
- uint32_t num_nodes = 0;
- VLA(Client_data *, client_list, list_count * 2);
- VLA(IPPTsPng *, assoc_list, list_count * 2);
- unsigned int sort = 0;
- bool sort_ok = 0;
-
- for (uint32_t i = 0; i < list_count; i++) {
- /* If node is not dead. */
- Client_data *client = &list[i];
-
- IPPTsPng *assocs[ASSOC_COUNT] = { &client->assoc6, &client->assoc4 };
-
- for (size_t i = 0; i < ASSOC_COUNT; i++) {
- IPPTsPng *assoc = assocs[i];
-
- if (!is_timeout(assoc->timestamp, KILL_NODE_TIMEOUT)) {
- sort = 0;
- not_kill++;
-
- if (is_timeout(assoc->last_pinged, PING_INTERVAL)) {
- getnodes(dht, assoc->ip_port, client->public_key, public_key, NULL);
- assoc->last_pinged = temp_time;
- }
-
- /* If node is good. */
- if (!is_timeout(assoc->timestamp, BAD_NODE_TIMEOUT)) {
- client_list[num_nodes] = client;
- assoc_list[num_nodes] = assoc;
- ++num_nodes;
- }
- } else {
- ++sort;
-
- /* Timed out should be at beginning, if they are not, sort the list. */
- if (sort > 1 && sort < (((i + 1) * 2) - 1)) {
- sort_ok = 1;
- }
- }
- }
- }
-
- if (sortable && sort_ok) {
- sort_client_list(list, list_count, public_key);
- }
-
- if ((num_nodes != 0) && (is_timeout(*lastgetnode, GET_NODE_INTERVAL) || *bootstrap_times < MAX_BOOTSTRAP_TIMES)) {
- uint32_t rand_node = rand() % (num_nodes);
-
- if ((num_nodes - 1) != rand_node) {
- rand_node += rand() % (num_nodes - (rand_node + 1));
- }
-
- getnodes(dht, assoc_list[rand_node]->ip_port, client_list[rand_node]->public_key, public_key, NULL);
-
- *lastgetnode = temp_time;
- ++*bootstrap_times;
- }
-
- return not_kill;
-}
-
-/* Ping each client in the "friends" list every PING_INTERVAL seconds. Send a get nodes request
- * every GET_NODE_INTERVAL seconds to a random good node for each "friend" in our "friends" list.
- */
-static void do_DHT_friends(DHT *dht)
-{
- for (size_t i = 0; i < dht->num_friends; ++i) {
- DHT_Friend *dht_friend = &dht->friends_list[i];
-
- for (size_t j = 0; j < dht_friend->num_to_bootstrap; ++j) {
- getnodes(dht, dht_friend->to_bootstrap[j].ip_port, dht_friend->to_bootstrap[j].public_key, dht_friend->public_key,
- NULL);
- }
-
- dht_friend->num_to_bootstrap = 0;
-
- do_ping_and_sendnode_requests(dht, &dht_friend->lastgetnode, dht_friend->public_key, dht_friend->client_list,
- MAX_FRIEND_CLIENTS,
- &dht_friend->bootstrap_times, 1);
- }
-}
-
-/* Ping each client in the close nodes list every PING_INTERVAL seconds.
- * Send a get nodes request every GET_NODE_INTERVAL seconds to a random good node in the list.
- */
-static void do_Close(DHT *dht)
-{
- for (size_t i = 0; i < dht->num_to_bootstrap; ++i) {
- getnodes(dht, dht->to_bootstrap[i].ip_port, dht->to_bootstrap[i].public_key, dht->self_public_key, NULL);
- }
-
- dht->num_to_bootstrap = 0;
-
- uint8_t not_killed = do_ping_and_sendnode_requests(dht, &dht->close_lastgetnodes, dht->self_public_key,
- dht->close_clientlist, LCLIENT_LIST, &dht->close_bootstrap_times, 0);
-
- if (!not_killed) {
- /* all existing nodes are at least KILL_NODE_TIMEOUT,
- * which means we are mute, as we only send packets to
- * nodes NOT in KILL_NODE_TIMEOUT
- *
- * so: reset all nodes to be BAD_NODE_TIMEOUT, but not
- * KILL_NODE_TIMEOUT, so we at least keep trying pings */
- uint64_t badonly = unix_time() - BAD_NODE_TIMEOUT;
-
- for (size_t i = 0; i < LCLIENT_LIST; i++) {
- Client_data *client = &dht->close_clientlist[i];
-
- IPPTsPng *assocs[ASSOC_COUNT] = { &client->assoc6, &client->assoc4 };
-
- for (size_t j = 0; j < ASSOC_COUNT; j++) {
- IPPTsPng *assoc = assocs[j];
-
- if (assoc->timestamp) {
- assoc->timestamp = badonly;
- }
- }
- }
- }
-}
-
-void DHT_getnodes(DHT *dht, const IP_Port *from_ipp, const uint8_t *from_id, const uint8_t *which_id)
-{
- getnodes(dht, *from_ipp, from_id, which_id, NULL);
-}
-
-void DHT_bootstrap(DHT *dht, IP_Port ip_port, const uint8_t *public_key)
-{
- getnodes(dht, ip_port, public_key, dht->self_public_key, NULL);
-}
-int DHT_bootstrap_from_address(DHT *dht, const char *address, uint8_t ipv6enabled,
- uint16_t port, const uint8_t *public_key)
-{
- IP_Port ip_port_v64;
- IP *ip_extra = NULL;
- IP_Port ip_port_v4;
- ip_init(&ip_port_v64.ip, ipv6enabled);
-
- if (ipv6enabled) {
- /* setup for getting BOTH: an IPv6 AND an IPv4 address */
- ip_port_v64.ip.family = TOX_AF_UNSPEC;
- ip_reset(&ip_port_v4.ip);
- ip_extra = &ip_port_v4.ip;
- }
-
- if (addr_resolve_or_parse_ip(address, &ip_port_v64.ip, ip_extra)) {
- ip_port_v64.port = port;
- DHT_bootstrap(dht, ip_port_v64, public_key);
-
- if ((ip_extra != NULL) && ip_isset(ip_extra)) {
- ip_port_v4.port = port;
- DHT_bootstrap(dht, ip_port_v4, public_key);
- }
-
- return 1;
- }
-
- return 0;
-}
-
-/* Send the given packet to node with public_key
- *
- * return -1 if failure.
- */
-int route_packet(const DHT *dht, const uint8_t *public_key, const uint8_t *packet, uint16_t length)
-{
- for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
- if (id_equal(public_key, dht->close_clientlist[i].public_key)) {
- const Client_data *client = &dht->close_clientlist[i];
- const IPPTsPng *assocs[ASSOC_COUNT] = { &client->assoc6, &client->assoc4 };
-
- for (size_t j = 0; j < ASSOC_COUNT; j++) {
- const IPPTsPng *assoc = assocs[j];
-
- if (ip_isset(&assoc->ip_port.ip)) {
- return sendpacket(dht->net, assoc->ip_port, packet, length);
- }
- }
-
- break;
- }
- }
-
- return -1;
-}
-
-/* Puts all the different ips returned by the nodes for a friend_num into array ip_portlist.
- * ip_portlist must be at least MAX_FRIEND_CLIENTS big.
- *
- * return the number of ips returned.
- * return 0 if we are connected to friend or if no ips were found.
- * return -1 if no such friend.
- */
-static int friend_iplist(const DHT *dht, IP_Port *ip_portlist, uint16_t friend_num)
-{
- if (friend_num >= dht->num_friends) {
- return -1;
- }
-
- DHT_Friend *dht_friend = &dht->friends_list[friend_num];
- Client_data *client;
- IP_Port ipv4s[MAX_FRIEND_CLIENTS];
- int num_ipv4s = 0;
- IP_Port ipv6s[MAX_FRIEND_CLIENTS];
- int num_ipv6s = 0;
-
- for (size_t i = 0; i < MAX_FRIEND_CLIENTS; ++i) {
- client = &(dht_friend->client_list[i]);
-
- /* If ip is not zero and node is good. */
- if (ip_isset(&client->assoc4.ret_ip_port.ip) && !is_timeout(client->assoc4.ret_timestamp, BAD_NODE_TIMEOUT)) {
- ipv4s[num_ipv4s] = client->assoc4.ret_ip_port;
- ++num_ipv4s;
- }
-
- if (ip_isset(&client->assoc6.ret_ip_port.ip) && !is_timeout(client->assoc6.ret_timestamp, BAD_NODE_TIMEOUT)) {
- ipv6s[num_ipv6s] = client->assoc6.ret_ip_port;
- ++num_ipv6s;
- }
-
- if (id_equal(client->public_key, dht_friend->public_key)) {
- if (!is_timeout(client->assoc6.timestamp, BAD_NODE_TIMEOUT)
- || !is_timeout(client->assoc4.timestamp, BAD_NODE_TIMEOUT)) {
- return 0; /* direct connectivity */
- }
- }
- }
-
-#ifdef FRIEND_IPLIST_PAD
- memcpy(ip_portlist, ipv6s, num_ipv6s * sizeof(IP_Port));
-
- if (num_ipv6s == MAX_FRIEND_CLIENTS) {
- return MAX_FRIEND_CLIENTS;
- }
-
- int num_ipv4s_used = MAX_FRIEND_CLIENTS - num_ipv6s;
-
- if (num_ipv4s_used > num_ipv4s) {
- num_ipv4s_used = num_ipv4s;
- }
-
- memcpy(&ip_portlist[num_ipv6s], ipv4s, num_ipv4s_used * sizeof(IP_Port));
- return num_ipv6s + num_ipv4s_used;
-
-#else /* !FRIEND_IPLIST_PAD */
-
- /* there must be some secret reason why we can't pad the longer list
- * with the shorter one...
- */
- if (num_ipv6s >= num_ipv4s) {
- memcpy(ip_portlist, ipv6s, num_ipv6s * sizeof(IP_Port));
- return num_ipv6s;
- }
-
- memcpy(ip_portlist, ipv4s, num_ipv4s * sizeof(IP_Port));
- return num_ipv4s;
-
-#endif /* !FRIEND_IPLIST_PAD */
-}
-
-
-/* Send the following packet to everyone who tells us they are connected to friend_id.
- *
- * return ip for friend.
- * return number of nodes the packet was sent to. (Only works if more than (MAX_FRIEND_CLIENTS / 4).
- */
-int route_tofriend(const DHT *dht, const uint8_t *friend_id, const uint8_t *packet, uint16_t length)
-{
- uint32_t num = index_of_friend_pk(dht->friends_list, dht->num_friends, friend_id);
-
- if (num == UINT32_MAX) {
- return 0;
- }
-
- uint32_t sent = 0;
- uint8_t friend_sent[MAX_FRIEND_CLIENTS] = {0};
-
- IP_Port ip_list[MAX_FRIEND_CLIENTS];
- int ip_num = friend_iplist(dht, ip_list, num);
-
- if (ip_num < (MAX_FRIEND_CLIENTS / 4)) {
- return 0; /* Reason for that? */
- }
-
- DHT_Friend *dht_friend = &dht->friends_list[num];
- Client_data *client;
-
- /* extra legwork, because having the outside allocating the space for us
- * is *usually* good(tm) (bites us in the behind in this case though) */
-
- for (uint32_t i = 0; i < MAX_FRIEND_CLIENTS; ++i) {
- if (friend_sent[i]) {/* Send one packet per client.*/
- continue;
- }
-
- client = &dht_friend->client_list[i];
-
- const IPPTsPng *assocs[ASSOC_COUNT] = { &client->assoc4, &client->assoc6 };
-
- for (size_t j = 0; j < ASSOC_COUNT; j++) {
- const IPPTsPng *assoc = assocs[j];
-
- /* If ip is not zero and node is good. */
- if (ip_isset(&assoc->ret_ip_port.ip) && !is_timeout(assoc->ret_timestamp, BAD_NODE_TIMEOUT)) {
- int retval = sendpacket(dht->net, assoc->ip_port, packet, length);
-
- if ((unsigned int)retval == length) {
- ++sent;
- friend_sent[i] = 1;
- }
- }
- }
- }
-
- return sent;
-}
-
-/* Send the following packet to one random person who tells us they are connected to friend_id.
- *
- * return number of nodes the packet was sent to.
- */
-static int routeone_tofriend(DHT *dht, const uint8_t *friend_id, const uint8_t *packet, uint16_t length)
-{
- uint32_t num = index_of_friend_pk(dht->friends_list, dht->num_friends, friend_id);
-
- if (num == UINT32_MAX) {
- return 0;
- }
-
- DHT_Friend *dht_friend = &dht->friends_list[num];
- Client_data *client;
-
- IP_Port ip_list[MAX_FRIEND_CLIENTS * 2];
- int n = 0;
-
- /* extra legwork, because having the outside allocating the space for us
- * is *usually* good(tm) (bites us in the behind in this case though) */
-
- for (uint32_t i = 0; i < MAX_FRIEND_CLIENTS; ++i) {
- client = &dht_friend->client_list[i];
-
- const IPPTsPng *assocs[ASSOC_COUNT] = { &client->assoc4, &client->assoc6 };
-
- for (size_t j = 0; j < ASSOC_COUNT; j++) {
- const IPPTsPng *assoc = assocs[j];
-
- /* If ip is not zero and node is good. */
- if (ip_isset(&assoc->ret_ip_port.ip) && !is_timeout(assoc->ret_timestamp, BAD_NODE_TIMEOUT)) {
- ip_list[n] = assoc->ip_port;
- ++n;
- }
- }
- }
-
- if (n < 1) {
- return 0;
- }
-
- int retval = sendpacket(dht->net, ip_list[rand() % n], packet, length);
-
- if ((unsigned int)retval == length) {
- return 1;
- }
-
- return 0;
-}
-
-/*----------------------------------------------------------------------------------*/
-/*---------------------BEGINNING OF NAT PUNCHING FUNCTIONS--------------------------*/
-
-static int send_NATping(DHT *dht, const uint8_t *public_key, uint64_t ping_id, uint8_t type)
-{
- uint8_t data[sizeof(uint64_t) + 1];
- uint8_t packet[MAX_CRYPTO_REQUEST_SIZE];
-
- int num = 0;
-
- data[0] = type;
- memcpy(data + 1, &ping_id, sizeof(uint64_t));
- /* 254 is NAT ping request packet id */
- int len = create_request(dht->self_public_key, dht->self_secret_key, packet, public_key, data,
- sizeof(uint64_t) + 1, CRYPTO_PACKET_NAT_PING);
-
- if (len == -1) {
- return -1;
- }
-
- if (type == 0) { /* If packet is request use many people to route it. */
- num = route_tofriend(dht, public_key, packet, len);
- } else if (type == 1) { /* If packet is response use only one person to route it */
- num = routeone_tofriend(dht, public_key, packet, len);
- }
-
- if (num == 0) {
- return -1;
- }
-
- return num;
-}
-
-/* Handle a received ping request for. */
-static int handle_NATping(void *object, IP_Port source, const uint8_t *source_pubkey, const uint8_t *packet,
- uint16_t length, void *userdata)
-{
- if (length != sizeof(uint64_t) + 1) {
- return 1;
- }
-
- DHT *dht = (DHT *)object;
- uint64_t ping_id;
- memcpy(&ping_id, packet + 1, sizeof(uint64_t));
-
- uint32_t friendnumber = index_of_friend_pk(dht->friends_list, dht->num_friends, source_pubkey);
-
- if (friendnumber == UINT32_MAX) {
- return 1;
- }
-
- DHT_Friend *dht_friend = &dht->friends_list[friendnumber];
-
- if (packet[0] == NAT_PING_REQUEST) {
- /* 1 is reply */
- send_NATping(dht, source_pubkey, ping_id, NAT_PING_RESPONSE);
- dht_friend->nat.recvNATping_timestamp = unix_time();
- return 0;
- }
-
- if (packet[0] == NAT_PING_RESPONSE) {
- if (dht_friend->nat.NATping_id == ping_id) {
- dht_friend->nat.NATping_id = random_64b();
- dht_friend->nat.hole_punching = 1;
- return 0;
- }
- }
-
- return 1;
-}
-
-/* Get the most common ip in the ip_portlist.
- * Only return ip if it appears in list min_num or more.
- * len must not be bigger than MAX_FRIEND_CLIENTS.
- *
- * return ip of 0 if failure.
- */
-static IP NAT_commonip(IP_Port *ip_portlist, uint16_t len, uint16_t min_num)
-{
- IP zero;
- ip_reset(&zero);
-
- if (len > MAX_FRIEND_CLIENTS) {
- return zero;
- }
-
- uint16_t numbers[MAX_FRIEND_CLIENTS] = {0};
-
- for (uint32_t i = 0; i < len; ++i) {
- for (uint32_t j = 0; j < len; ++j) {
- if (ip_equal(&ip_portlist[i].ip, &ip_portlist[j].ip)) {
- ++numbers[i];
- }
- }
-
- if (numbers[i] >= min_num) {
- return ip_portlist[i].ip;
- }
- }
-
- return zero;
-}
-
-/* Return all the ports for one ip in a list.
- * portlist must be at least len long,
- * where len is the length of ip_portlist.
- *
- * return number of ports and puts the list of ports in portlist.
- */
-static uint16_t NAT_getports(uint16_t *portlist, IP_Port *ip_portlist, uint16_t len, IP ip)
-{
- uint16_t num = 0;
-
- for (uint32_t i = 0; i < len; ++i) {
- if (ip_equal(&ip_portlist[i].ip, &ip)) {
- portlist[num] = net_ntohs(ip_portlist[i].port);
- ++num;
- }
- }
-
- return num;
-}
-
-static void punch_holes(DHT *dht, IP ip, uint16_t *port_list, uint16_t numports, uint16_t friend_num)
-{
- if (!dht->hole_punching_enabled) {
- return;
- }
-
- if (numports > MAX_FRIEND_CLIENTS || numports == 0) {
- return;
- }
-
- uint16_t first_port = port_list[0];
- uint32_t i;
-
- for (i = 0; i < numports; ++i) {
- if (first_port != port_list[i]) {
- break;
- }
- }
-
- if (i == numports) { /* If all ports are the same, only try that one port. */
- IP_Port pinging;
- ip_copy(&pinging.ip, &ip);
- pinging.port = net_htons(first_port);
- send_ping_request(dht->ping, pinging, dht->friends_list[friend_num].public_key);
- } else {
- for (i = 0; i < MAX_PUNCHING_PORTS; ++i) {
- /* TODO(irungentoo): Improve port guessing algorithm. */
- uint32_t it = i + dht->friends_list[friend_num].nat.punching_index;
- int8_t sign = (it % 2) ? -1 : 1;
- uint32_t delta = sign * (it / (2 * numports));
- uint32_t index = (it / 2) % numports;
- uint16_t port = port_list[index] + delta;
- IP_Port pinging;
- ip_copy(&pinging.ip, &ip);
- pinging.port = net_htons(port);
- send_ping_request(dht->ping, pinging, dht->friends_list[friend_num].public_key);
- }
-
- dht->friends_list[friend_num].nat.punching_index += i;
- }
-
- if (dht->friends_list[friend_num].nat.tries > MAX_NORMAL_PUNCHING_TRIES) {
- uint16_t port = 1024;
- IP_Port pinging;
- ip_copy(&pinging.ip, &ip);
-
- for (i = 0; i < MAX_PUNCHING_PORTS; ++i) {
- uint32_t it = i + dht->friends_list[friend_num].nat.punching_index2;
- pinging.port = net_htons(port + it);
- send_ping_request(dht->ping, pinging, dht->friends_list[friend_num].public_key);
- }
-
- dht->friends_list[friend_num].nat.punching_index2 += i - (MAX_PUNCHING_PORTS / 2);
- }
-
- ++dht->friends_list[friend_num].nat.tries;
-}
-
-static void do_NAT(DHT *dht)
-{
- uint64_t temp_time = unix_time();
-
- for (uint32_t i = 0; i < dht->num_friends; ++i) {
- IP_Port ip_list[MAX_FRIEND_CLIENTS];
- int num = friend_iplist(dht, ip_list, i);
-
- /* If already connected or friend is not online don't try to hole punch. */
- if (num < MAX_FRIEND_CLIENTS / 2) {
- continue;
- }
-
- if (dht->friends_list[i].nat.NATping_timestamp + PUNCH_INTERVAL < temp_time) {
- send_NATping(dht, dht->friends_list[i].public_key, dht->friends_list[i].nat.NATping_id, NAT_PING_REQUEST);
- dht->friends_list[i].nat.NATping_timestamp = temp_time;
- }
-
- if (dht->friends_list[i].nat.hole_punching == 1 &&
- dht->friends_list[i].nat.punching_timestamp + PUNCH_INTERVAL < temp_time &&
- dht->friends_list[i].nat.recvNATping_timestamp + PUNCH_INTERVAL * 2 >= temp_time) {
-
- IP ip = NAT_commonip(ip_list, num, MAX_FRIEND_CLIENTS / 2);
-
- if (!ip_isset(&ip)) {
- continue;
- }
-
- if (dht->friends_list[i].nat.punching_timestamp + PUNCH_RESET_TIME < temp_time) {
- dht->friends_list[i].nat.tries = 0;
- dht->friends_list[i].nat.punching_index = 0;
- dht->friends_list[i].nat.punching_index2 = 0;
- }
-
- uint16_t port_list[MAX_FRIEND_CLIENTS];
- uint16_t numports = NAT_getports(port_list, ip_list, num, ip);
- punch_holes(dht, ip, port_list, numports, i);
-
- dht->friends_list[i].nat.punching_timestamp = temp_time;
- dht->friends_list[i].nat.hole_punching = 0;
- }
- }
-}
-
-/*----------------------------------------------------------------------------------*/
-/*-----------------------END OF NAT PUNCHING FUNCTIONS------------------------------*/
-
-#define HARDREQ_DATA_SIZE 384 /* Attempt to prevent amplification/other attacks*/
-
-#define CHECK_TYPE_ROUTE_REQ 0
-#define CHECK_TYPE_ROUTE_RES 1
-#define CHECK_TYPE_GETNODE_REQ 2
-#define CHECK_TYPE_GETNODE_RES 3
-#define CHECK_TYPE_TEST_REQ 4
-#define CHECK_TYPE_TEST_RES 5
-
-#if DHT_HARDENING
-static int send_hardening_req(DHT *dht, Node_format *sendto, uint8_t type, uint8_t *contents, uint16_t length)
-{
- if (length > HARDREQ_DATA_SIZE - 1) {
- return -1;
- }
-
- uint8_t packet[MAX_CRYPTO_REQUEST_SIZE];
- uint8_t data[HARDREQ_DATA_SIZE] = {0};
- data[0] = type;
- memcpy(data + 1, contents, length);
- int len = create_request(dht->self_public_key, dht->self_secret_key, packet, sendto->public_key, data,
- sizeof(data), CRYPTO_PACKET_HARDENING);
-
- if (len == -1) {
- return -1;
- }
-
- return sendpacket(dht->net, sendto->ip_port, packet, len);
-}
-
-/* Send a get node hardening request */
-static int send_hardening_getnode_req(DHT *dht, Node_format *dest, Node_format *node_totest, uint8_t *search_id)
-{
- uint8_t data[sizeof(Node_format) + CRYPTO_PUBLIC_KEY_SIZE];
- memcpy(data, node_totest, sizeof(Node_format));
- memcpy(data + sizeof(Node_format), search_id, CRYPTO_PUBLIC_KEY_SIZE);
- return send_hardening_req(dht, dest, CHECK_TYPE_GETNODE_REQ, data, sizeof(Node_format) + CRYPTO_PUBLIC_KEY_SIZE);
-}
-#endif
-
-/* Send a get node hardening response */
-static int send_hardening_getnode_res(const DHT *dht, const Node_format *sendto, const uint8_t *queried_client_id,
- const uint8_t *nodes_data, uint16_t nodes_data_length)
-{
- if (!ip_isset(&sendto->ip_port.ip)) {
- return -1;
- }
-
- uint8_t packet[MAX_CRYPTO_REQUEST_SIZE];
- VLA(uint8_t, data, 1 + CRYPTO_PUBLIC_KEY_SIZE + nodes_data_length);
- data[0] = CHECK_TYPE_GETNODE_RES;
- memcpy(data + 1, queried_client_id, CRYPTO_PUBLIC_KEY_SIZE);
- memcpy(data + 1 + CRYPTO_PUBLIC_KEY_SIZE, nodes_data, nodes_data_length);
- int len = create_request(dht->self_public_key, dht->self_secret_key, packet, sendto->public_key, data,
- SIZEOF_VLA(data), CRYPTO_PACKET_HARDENING);
-
- if (len == -1) {
- return -1;
- }
-
- return sendpacket(dht->net, sendto->ip_port, packet, len);
-}
-
-/* TODO(irungentoo): improve */
-static IPPTsPng *get_closelist_IPPTsPng(DHT *dht, const uint8_t *public_key, Family sa_family)
-{
- for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
- if (!id_equal(dht->close_clientlist[i].public_key, public_key)) {
- continue;
- }
-
- if (sa_family == TOX_AF_INET) {
- return &dht->close_clientlist[i].assoc4;
- }
-
- if (sa_family == TOX_AF_INET6) {
- return &dht->close_clientlist[i].assoc6;
- }
- }
-
- return NULL;
-}
-
-/*
- * check how many nodes in nodes are also present in the closelist.
- * TODO(irungentoo): make this function better.
- */
-static uint32_t have_nodes_closelist(DHT *dht, Node_format *nodes, uint16_t num)
-{
- uint32_t counter = 0;
-
- for (uint32_t i = 0; i < num; ++i) {
- if (id_equal(nodes[i].public_key, dht->self_public_key)) {
- ++counter;
- continue;
- }
-
- IPPTsPng *temp = get_closelist_IPPTsPng(dht, nodes[i].public_key, nodes[i].ip_port.ip.family);
-
- if (temp) {
- if (!is_timeout(temp->timestamp, BAD_NODE_TIMEOUT)) {
- ++counter;
- }
- }
- }
-
- return counter;
-}
-
-/* Interval in seconds between hardening checks */
-#define HARDENING_INTERVAL 120
-#define HARDEN_TIMEOUT 1200
-
-/* Handle a received hardening packet */
-static int handle_hardening(void *object, IP_Port source, const uint8_t *source_pubkey, const uint8_t *packet,
- uint16_t length, void *userdata)
-{
- DHT *dht = (DHT *)object;
-
- if (length < 2) {
- return 1;
- }
-
- switch (packet[0]) {
- case CHECK_TYPE_GETNODE_REQ: {
- if (length != HARDREQ_DATA_SIZE) {
- return 1;
- }
-
- Node_format node, tocheck_node;
- node.ip_port = source;
- memcpy(node.public_key, source_pubkey, CRYPTO_PUBLIC_KEY_SIZE);
- memcpy(&tocheck_node, packet + 1, sizeof(Node_format));
-
- if (getnodes(dht, tocheck_node.ip_port, tocheck_node.public_key, packet + 1 + sizeof(Node_format), &node) == -1) {
- return 1;
- }
-
- return 0;
- }
-
- case CHECK_TYPE_GETNODE_RES: {
- if (length <= CRYPTO_PUBLIC_KEY_SIZE + 1) {
- return 1;
- }
-
- if (length > 1 + CRYPTO_PUBLIC_KEY_SIZE + sizeof(Node_format) * MAX_SENT_NODES) {
- return 1;
- }
-
- uint16_t length_nodes = length - 1 - CRYPTO_PUBLIC_KEY_SIZE;
- Node_format nodes[MAX_SENT_NODES];
- int num_nodes = unpack_nodes(nodes, MAX_SENT_NODES, 0, packet + 1 + CRYPTO_PUBLIC_KEY_SIZE, length_nodes, 0);
-
- /* TODO(irungentoo): MAX_SENT_NODES nodes should be returned at all times
- (right now we have a small network size so it could cause problems for testing and etc..) */
- if (num_nodes <= 0) {
- return 1;
- }
-
- /* NOTE: This should work for now but should be changed to something better. */
- if (have_nodes_closelist(dht, nodes, num_nodes) < (uint32_t)((num_nodes + 2) / 2)) {
- return 1;
- }
-
- IPPTsPng *temp = get_closelist_IPPTsPng(dht, packet + 1, nodes[0].ip_port.ip.family);
-
- if (temp == NULL) {
- return 1;
- }
-
- if (is_timeout(temp->hardening.send_nodes_timestamp, HARDENING_INTERVAL)) {
- return 1;
- }
-
- if (!id_equal(temp->hardening.send_nodes_pingedid, source_pubkey)) {
- return 1;
- }
-
- /* If Nodes look good and the request checks out */
- temp->hardening.send_nodes_ok = 1;
- return 0;/* success*/
- }
- }
-
- return 1;
-}
-
-#if DHT_HARDENING
-/* Return a random node from all the nodes we are connected to.
- * TODO(irungentoo): improve this function.
- */
-static Node_format random_node(DHT *dht, Family sa_family)
-{
- uint8_t id[CRYPTO_PUBLIC_KEY_SIZE];
-
- for (uint32_t i = 0; i < CRYPTO_PUBLIC_KEY_SIZE / 4; ++i) { /* populate the id with pseudorandom bytes.*/
- uint32_t t = rand();
- memcpy(id + i * sizeof(t), &t, sizeof(t));
- }
-
- Node_format nodes_list[MAX_SENT_NODES];
- memset(nodes_list, 0, sizeof(nodes_list));
- uint32_t num_nodes = get_close_nodes(dht, id, nodes_list, sa_family, 1, 0);
-
- if (num_nodes == 0) {
- return nodes_list[0];
- }
-
- return nodes_list[rand() % num_nodes];
-}
-#endif
-
-/* Put up to max_num nodes in nodes from the closelist.
- *
- * return the number of nodes.
- */
-static uint16_t list_nodes(Client_data *list, size_t length, Node_format *nodes, uint16_t max_num)
-{
- if (max_num == 0) {
- return 0;
- }
-
- uint16_t count = 0;
-
- for (size_t i = length; i != 0; --i) {
- IPPTsPng *assoc = NULL;
-
- if (!is_timeout(list[i - 1].assoc4.timestamp, BAD_NODE_TIMEOUT)) {
- assoc = &list[i - 1].assoc4;
- }
-
- if (!is_timeout(list[i - 1].assoc6.timestamp, BAD_NODE_TIMEOUT)) {
- if (assoc == NULL) {
- assoc = &list[i - 1].assoc6;
- } else if (rand() % 2) {
- assoc = &list[i - 1].assoc6;
- }
- }
-
- if (assoc != NULL) {
- memcpy(nodes[count].public_key, list[i - 1].public_key, CRYPTO_PUBLIC_KEY_SIZE);
- nodes[count].ip_port = assoc->ip_port;
- ++count;
-
- if (count >= max_num) {
- return count;
- }
- }
- }
-
- return count;
-}
-
-/* Put up to max_num nodes in nodes from the random friends.
- *
- * return the number of nodes.
- */
-uint16_t randfriends_nodes(DHT *dht, Node_format *nodes, uint16_t max_num)
-{
- if (max_num == 0) {
- return 0;
- }
-
- uint16_t count = 0;
- unsigned int r = rand();
-
- for (size_t i = 0; i < DHT_FAKE_FRIEND_NUMBER; ++i) {
- count += list_nodes(dht->friends_list[(i + r) % DHT_FAKE_FRIEND_NUMBER].client_list, MAX_FRIEND_CLIENTS, nodes + count,
- max_num - count);
-
- if (count >= max_num) {
- break;
- }
- }
-
- return count;
-}
-
-/* Put up to max_num nodes in nodes from the closelist.
- *
- * return the number of nodes.
- */
-uint16_t closelist_nodes(DHT *dht, Node_format *nodes, uint16_t max_num)
-{
- return list_nodes(dht->close_clientlist, LCLIENT_LIST, nodes, max_num);
-}
-
-#if DHT_HARDENING
-static void do_hardening(DHT *dht)
-{
- for (uint32_t i = 0; i < LCLIENT_LIST * 2; ++i) {
- IPPTsPng *cur_iptspng;
- Family sa_family;
- uint8_t *public_key = dht->close_clientlist[i / 2].public_key;
-
- if (i % 2 == 0) {
- cur_iptspng = &dht->close_clientlist[i / 2].assoc4;
- sa_family = TOX_AF_INET;
- } else {
- cur_iptspng = &dht->close_clientlist[i / 2].assoc6;
- sa_family = TOX_AF_INET6;
- }
-
- if (is_timeout(cur_iptspng->timestamp, BAD_NODE_TIMEOUT)) {
- continue;
- }
-
- if (cur_iptspng->hardening.send_nodes_ok == 0) {
- if (is_timeout(cur_iptspng->hardening.send_nodes_timestamp, HARDENING_INTERVAL)) {
- Node_format rand_node = random_node(dht, sa_family);
-
- if (!ipport_isset(&rand_node.ip_port)) {
- continue;
- }
-
- if (id_equal(public_key, rand_node.public_key)) {
- continue;
- }
-
- Node_format to_test;
- to_test.ip_port = cur_iptspng->ip_port;
- memcpy(to_test.public_key, public_key, CRYPTO_PUBLIC_KEY_SIZE);
-
- // TODO(irungentoo): The search id should maybe not be ours?
- if (send_hardening_getnode_req(dht, &rand_node, &to_test, dht->self_public_key) > 0) {
- memcpy(cur_iptspng->hardening.send_nodes_pingedid, rand_node.public_key, CRYPTO_PUBLIC_KEY_SIZE);
- cur_iptspng->hardening.send_nodes_timestamp = unix_time();
- }
- }
- } else {
- if (is_timeout(cur_iptspng->hardening.send_nodes_timestamp, HARDEN_TIMEOUT)) {
- cur_iptspng->hardening.send_nodes_ok = 0;
- }
- }
-
- // TODO(irungentoo): add the 2 other testers.
- }
-}
-#endif
-
-/*----------------------------------------------------------------------------------*/
-
-void cryptopacket_registerhandler(DHT *dht, uint8_t byte, cryptopacket_handler_callback cb, void *object)
-{
- dht->cryptopackethandlers[byte].function = cb;
- dht->cryptopackethandlers[byte].object = object;
-}
-
-static int cryptopacket_handle(void *object, IP_Port source, const uint8_t *packet, uint16_t length, void *userdata)
-{
- DHT *dht = (DHT *)object;
-
- assert(packet[0] == NET_PACKET_CRYPTO);
-
- if (length <= CRYPTO_PUBLIC_KEY_SIZE * 2 + CRYPTO_NONCE_SIZE + 1 + CRYPTO_MAC_SIZE ||
- length > MAX_CRYPTO_REQUEST_SIZE + CRYPTO_MAC_SIZE) {
- return 1;
- }
-
- // Check if request is for us.
- if (id_equal(packet + 1, dht->self_public_key)) {
- uint8_t public_key[CRYPTO_PUBLIC_KEY_SIZE];
- uint8_t data[MAX_CRYPTO_REQUEST_SIZE];
- uint8_t number;
- int len = handle_request(dht->self_public_key, dht->self_secret_key, public_key, data, &number, packet, length);
-
- if (len == -1 || len == 0) {
- return 1;
- }
-
- if (!dht->cryptopackethandlers[number].function) {
- return 1;
- }
-
- return dht->cryptopackethandlers[number].function(dht->cryptopackethandlers[number].object, source, public_key,
- data, len, userdata);
- }
-
- /* If request is not for us, try routing it. */
- int retval = route_packet(dht, packet + 1, packet, length);
-
- if ((unsigned int)retval == length) {
- return 0;
- }
-
- return 1;
-}
-
-/*----------------------------------------------------------------------------------*/
-
-DHT *new_DHT(Logger *log, Networking_Core *net, bool holepunching_enabled)
-{
- /* init time */
- unix_time_update();
-
- if (net == NULL) {
- return NULL;
- }
-
- DHT *dht = (DHT *)calloc(1, sizeof(DHT));
-
- if (dht == NULL) {
- return NULL;
- }
-
- dht->log = log;
- dht->net = net;
-
- dht->hole_punching_enabled = holepunching_enabled;
-
- dht->ping = new_ping(dht);
-
- if (dht->ping == NULL) {
- kill_DHT(dht);
- return NULL;
- }
-
- networking_registerhandler(dht->net, NET_PACKET_GET_NODES, &handle_getnodes, dht);
- networking_registerhandler(dht->net, NET_PACKET_SEND_NODES_IPV6, &handle_sendnodes_ipv6, dht);
- networking_registerhandler(dht->net, NET_PACKET_CRYPTO, &cryptopacket_handle, dht);
- cryptopacket_registerhandler(dht, CRYPTO_PACKET_NAT_PING, &handle_NATping, dht);
- cryptopacket_registerhandler(dht, CRYPTO_PACKET_HARDENING, &handle_hardening, dht);
-
- new_symmetric_key(dht->secret_symmetric_key);
- crypto_new_keypair(dht->self_public_key, dht->self_secret_key);
-
- ping_array_init(&dht->dht_ping_array, DHT_PING_ARRAY_SIZE, PING_TIMEOUT);
- ping_array_init(&dht->dht_harden_ping_array, DHT_PING_ARRAY_SIZE, PING_TIMEOUT);
-
- for (uint32_t i = 0; i < DHT_FAKE_FRIEND_NUMBER; ++i) {
- uint8_t random_key_bytes[CRYPTO_PUBLIC_KEY_SIZE];
- random_bytes(random_key_bytes, sizeof(random_key_bytes));
-
- if (DHT_addfriend(dht, random_key_bytes, 0, 0, 0, 0) != 0) {
- kill_DHT(dht);
- return NULL;
- }
- }
-
- return dht;
-}
-
-void do_DHT(DHT *dht)
-{
- unix_time_update();
-
- if (dht->last_run == unix_time()) {
- return;
- }
-
- // Load friends/clients if first call to do_DHT
- if (dht->loaded_num_nodes) {
- DHT_connect_after_load(dht);
- }
-
- do_Close(dht);
- do_DHT_friends(dht);
- do_NAT(dht);
- do_to_ping(dht->ping);
-#if DHT_HARDENING
- do_hardening(dht);
-#endif
- dht->last_run = unix_time();
-}
-void kill_DHT(DHT *dht)
-{
- networking_registerhandler(dht->net, NET_PACKET_GET_NODES, NULL, NULL);
- networking_registerhandler(dht->net, NET_PACKET_SEND_NODES_IPV6, NULL, NULL);
- cryptopacket_registerhandler(dht, CRYPTO_PACKET_NAT_PING, NULL, NULL);
- cryptopacket_registerhandler(dht, CRYPTO_PACKET_HARDENING, NULL, NULL);
- ping_array_free_all(&dht->dht_ping_array);
- ping_array_free_all(&dht->dht_harden_ping_array);
- kill_ping(dht->ping);
- free(dht->friends_list);
- free(dht->loaded_nodes_list);
- free(dht);
-}
-
-/* new DHT format for load/save, more robust and forward compatible */
-// TODO(irungentoo): Move this closer to Messenger.
-#define DHT_STATE_COOKIE_GLOBAL 0x159000d
-
-#define DHT_STATE_COOKIE_TYPE 0x11ce
-#define DHT_STATE_TYPE_NODES 4
-
-#define MAX_SAVED_DHT_NODES (((DHT_FAKE_FRIEND_NUMBER * MAX_FRIEND_CLIENTS) + LCLIENT_LIST) * 2)
-
-/* Get the size of the DHT (for saving). */
-uint32_t DHT_size(const DHT *dht)
-{
- uint32_t numv4 = 0, numv6 = 0;
-
- for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
- numv4 += (dht->close_clientlist[i].assoc4.timestamp != 0);
- numv6 += (dht->close_clientlist[i].assoc6.timestamp != 0);
- }
-
- for (uint32_t i = 0; i < DHT_FAKE_FRIEND_NUMBER && i < dht->num_friends; ++i) {
- DHT_Friend *fr = &dht->friends_list[i];
-
- for (uint32_t j = 0; j < MAX_FRIEND_CLIENTS; ++j) {
- numv4 += (fr->client_list[j].assoc4.timestamp != 0);
- numv6 += (fr->client_list[j].assoc6.timestamp != 0);
- }
- }
-
- uint32_t size32 = sizeof(uint32_t), sizesubhead = size32 * 2;
-
- return size32 + sizesubhead + (packed_node_size(TOX_AF_INET) * numv4) + (packed_node_size(TOX_AF_INET6) * numv6);
-}
-
-static uint8_t *DHT_save_subheader(uint8_t *data, uint32_t len, uint16_t type)
-{
- host_to_lendian32(data, len);
- data += sizeof(uint32_t);
- host_to_lendian32(data, (host_tolendian16(DHT_STATE_COOKIE_TYPE) << 16) | host_tolendian16(type));
- data += sizeof(uint32_t);
- return data;
-}
-
-
-/* Save the DHT in data where data is an array of size DHT_size(). */
-void DHT_save(DHT *dht, uint8_t *data)
-{
- host_to_lendian32(data, DHT_STATE_COOKIE_GLOBAL);
- data += sizeof(uint32_t);
-
- uint8_t *old_data = data;
-
- /* get right offset. we write the actual header later. */
- data = DHT_save_subheader(data, 0, 0);
-
- Node_format clients[MAX_SAVED_DHT_NODES];
-
- uint32_t num = 0;
-
- for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
- if (dht->close_clientlist[i].assoc4.timestamp != 0) {
- memcpy(clients[num].public_key, dht->close_clientlist[i].public_key, CRYPTO_PUBLIC_KEY_SIZE);
- clients[num].ip_port = dht->close_clientlist[i].assoc4.ip_port;
- ++num;
- }
-
- if (dht->close_clientlist[i].assoc6.timestamp != 0) {
- memcpy(clients[num].public_key, dht->close_clientlist[i].public_key, CRYPTO_PUBLIC_KEY_SIZE);
- clients[num].ip_port = dht->close_clientlist[i].assoc6.ip_port;
- ++num;
- }
- }
-
- for (uint32_t i = 0; i < DHT_FAKE_FRIEND_NUMBER && i < dht->num_friends; ++i) {
- DHT_Friend *fr = &dht->friends_list[i];
-
- for (uint32_t j = 0; j < MAX_FRIEND_CLIENTS; ++j) {
- if (fr->client_list[j].assoc4.timestamp != 0) {
- memcpy(clients[num].public_key, fr->client_list[j].public_key, CRYPTO_PUBLIC_KEY_SIZE);
- clients[num].ip_port = fr->client_list[j].assoc4.ip_port;
- ++num;
- }
-
- if (fr->client_list[j].assoc6.timestamp != 0) {
- memcpy(clients[num].public_key, fr->client_list[j].public_key, CRYPTO_PUBLIC_KEY_SIZE);
- clients[num].ip_port = fr->client_list[j].assoc6.ip_port;
- ++num;
- }
- }
- }
-
- DHT_save_subheader(old_data, pack_nodes(data, sizeof(Node_format) * num, clients, num), DHT_STATE_TYPE_NODES);
-}
-
-/* Bootstrap from this number of nodes every time DHT_connect_after_load() is called */
-#define SAVE_BOOTSTAP_FREQUENCY 8
-
-/* Start sending packets after DHT loaded_friends_list and loaded_clients_list are set */
-int DHT_connect_after_load(DHT *dht)
-{
- if (dht == NULL) {
- return -1;
- }
-
- if (!dht->loaded_nodes_list) {
- return -1;
- }
-
- /* DHT is connected, stop. */
- if (DHT_non_lan_connected(dht)) {
- free(dht->loaded_nodes_list);
- dht->loaded_nodes_list = NULL;
- dht->loaded_num_nodes = 0;
- return 0;
- }
-
- for (uint32_t i = 0; i < dht->loaded_num_nodes && i < SAVE_BOOTSTAP_FREQUENCY; ++i) {
- unsigned int index = dht->loaded_nodes_index % dht->loaded_num_nodes;
- DHT_bootstrap(dht, dht->loaded_nodes_list[index].ip_port, dht->loaded_nodes_list[index].public_key);
- ++dht->loaded_nodes_index;
- }
-
- return 0;
-}
-
-static int dht_load_state_callback(void *outer, const uint8_t *data, uint32_t length, uint16_t type)
-{
- DHT *dht = (DHT *)outer;
-
- switch (type) {
- case DHT_STATE_TYPE_NODES:
- if (length == 0) {
- break;
- }
-
- {
- free(dht->loaded_nodes_list);
- // Copy to loaded_clients_list
- dht->loaded_nodes_list = (Node_format *)calloc(MAX_SAVED_DHT_NODES, sizeof(Node_format));
-
- int num = unpack_nodes(dht->loaded_nodes_list, MAX_SAVED_DHT_NODES, NULL, data, length, 0);
-
- if (num > 0) {
- dht->loaded_num_nodes = num;
- } else {
- dht->loaded_num_nodes = 0;
- }
- } /* localize declarations */
-
- break;
-
- default:
- LOGGER_ERROR(dht->log, "Load state (DHT): contains unrecognized part (len %u, type %u)\n",
- length, type);
- break;
- }
-
- return 0;
-}
-
-/* Load the DHT from data of size size.
- *
- * return -1 if failure.
- * return 0 if success.
- */
-int DHT_load(DHT *dht, const uint8_t *data, uint32_t length)
-{
- uint32_t cookie_len = sizeof(uint32_t);
-
- if (length > cookie_len) {
- uint32_t data32;
- lendian_to_host32(&data32, data);
-
- if (data32 == DHT_STATE_COOKIE_GLOBAL) {
- return load_state(dht_load_state_callback, dht->log, dht, data + cookie_len,
- length - cookie_len, DHT_STATE_COOKIE_TYPE);
- }
- }
-
- return -1;
-}
-
-/* return 0 if we are not connected to the DHT.
- * return 1 if we are.
- */
-int DHT_isconnected(const DHT *dht)
-{
- unix_time_update();
-
- for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
- const Client_data *client = &dht->close_clientlist[i];
-
- if (!is_timeout(client->assoc4.timestamp, BAD_NODE_TIMEOUT) ||
- !is_timeout(client->assoc6.timestamp, BAD_NODE_TIMEOUT)) {
- return 1;
- }
- }
-
- return 0;
-}
-
-/* return 0 if we are not connected or only connected to lan peers with the DHT.
- * return 1 if we are.
- */
-int DHT_non_lan_connected(const DHT *dht)
-{
- unix_time_update();
-
- for (uint32_t i = 0; i < LCLIENT_LIST; ++i) {
- const Client_data *client = &dht->close_clientlist[i];
-
- if (!is_timeout(client->assoc4.timestamp, BAD_NODE_TIMEOUT) && LAN_ip(client->assoc4.ip_port.ip) == -1) {
- return 1;
- }
-
- if (!is_timeout(client->assoc6.timestamp, BAD_NODE_TIMEOUT) && LAN_ip(client->assoc6.ip_port.ip) == -1) {
- return 1;
- }
- }
-
- return 0;
-}
--
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