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/*
* Tox DHT bootstrap daemon.
* Main file.
*/
/*
* Copyright © 2016-2018 The TokTok team.
* Copyright © 2014-2016 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/>.
*/
#ifndef _XOPEN_SOURCE
#define _XOPEN_SOURCE 600
#endif
// system provided
#include <sys/stat.h>
#include <unistd.h>
// C
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// toxcore
#include "../../../toxcore/tox.h"
#include "../../../toxcore/LAN_discovery.h"
#include "../../../toxcore/TCP_server.h"
#include "../../../toxcore/logger.h"
#include "../../../toxcore/mono_time.h"
#include "../../../toxcore/onion_announce.h"
#include "../../../toxcore/util.h"
// misc
#include "../../bootstrap_node_packets.h"
#include "command_line_arguments.h"
#include "config.h"
#include "global.h"
#include "log.h"
#define SLEEP_MILLISECONDS(MS) usleep(1000*MS)
// Uses the already existing key or creates one if it didn't exist
//
// returns 1 on success
// 0 on failure - no keys were read or stored
static int manage_keys(DHT *dht, char *keys_file_path)
{
enum { KEYS_SIZE = CRYPTO_PUBLIC_KEY_SIZE + CRYPTO_SECRET_KEY_SIZE };
uint8_t keys[KEYS_SIZE];
FILE *keys_file;
// Check if file exits, proceed to open and load keys
keys_file = fopen(keys_file_path, "r");
if (keys_file != nullptr) {
const size_t read_size = fread(keys, sizeof(uint8_t), KEYS_SIZE, keys_file);
if (read_size != KEYS_SIZE) {
fclose(keys_file);
return 0;
}
dht_set_self_public_key(dht, keys);
dht_set_self_secret_key(dht, keys + CRYPTO_PUBLIC_KEY_SIZE);
} else {
// Otherwise save new keys
memcpy(keys, dht_get_self_public_key(dht), CRYPTO_PUBLIC_KEY_SIZE);
memcpy(keys + CRYPTO_PUBLIC_KEY_SIZE, dht_get_self_secret_key(dht), CRYPTO_SECRET_KEY_SIZE);
keys_file = fopen(keys_file_path, "w");
if (!keys_file) {
return 0;
}
const size_t write_size = fwrite(keys, sizeof(uint8_t), KEYS_SIZE, keys_file);
if (write_size != KEYS_SIZE) {
fclose(keys_file);
return 0;
}
}
fclose(keys_file);
return 1;
}
// Prints public key
static void print_public_key(const uint8_t *public_key)
{
char buffer[2 * CRYPTO_PUBLIC_KEY_SIZE + 1];
int index = 0;
size_t i;
for (i = 0; i < CRYPTO_PUBLIC_KEY_SIZE; i++) {
index += sprintf(buffer + index, "%02X", public_key[i]);
}
log_write(LOG_LEVEL_INFO, "Public Key: %s\n", buffer);
}
// Demonizes the process, appending PID to the PID file and closing file descriptors based on log backend
// Terminates the application if the daemonization fails.
static void daemonize(LOG_BACKEND log_backend, char *pid_file_path)
{
// Check if the PID file exists
FILE *pid_file;
if ((pid_file = fopen(pid_file_path, "r"))) {
log_write(LOG_LEVEL_WARNING, "Another instance of the daemon is already running, PID file %s exists.\n", pid_file_path);
fclose(pid_file);
}
// Open the PID file for writing
pid_file = fopen(pid_file_path, "a+");
if (pid_file == nullptr) {
log_write(LOG_LEVEL_ERROR, "Couldn't open the PID file for writing: %s. Exiting.\n", pid_file_path);
exit(1);
}
// Fork off from the parent process
const pid_t pid = fork();
if (pid > 0) {
fprintf(pid_file, "%d", pid);
fclose(pid_file);
log_write(LOG_LEVEL_INFO, "Forked successfully: PID: %d.\n", pid);
exit(0);
} else {
fclose(pid_file);
}
if (pid < 0) {
log_write(LOG_LEVEL_ERROR, "Forking failed. Exiting.\n");
exit(1);
}
// Create a new SID for the child process
if (setsid() < 0) {
log_write(LOG_LEVEL_ERROR, "SID creation failure. Exiting.\n");
exit(1);
}
// Change the current working directory
if ((chdir("/")) < 0) {
log_write(LOG_LEVEL_ERROR, "Couldn't change working directory to '/'. Exiting.\n");
exit(1);
}
// Go quiet
if (log_backend != LOG_BACKEND_STDOUT) {
close(STDOUT_FILENO);
close(STDIN_FILENO);
close(STDERR_FILENO);
}
}
void print_log(void *context, LOGGER_LEVEL level, const char *file, int line,
const char *func, const char *message, void *userdata)
{
if (MIN_LOGGER_LEVEL != LOG_TRACE && MIN_LOGGER_LEVEL != LOG_DEBUG) {
return;
}
char *strlevel;
switch (level) {
case LOG_TRACE:
strlevel = "TRACE";
break;
case LOG_DEBUG:
strlevel = "DEBUG";
break;
case LOG_INFO:
strlevel = "INFO";
break;
case LOG_WARNING:
strlevel = "WARNING";
break;
case LOG_ERROR:
strlevel = "ERROR";
break;
default:
strlevel = "<unknown>";
break;
}
fprintf(stderr, "[%s] %s:%d(%s) %s\n", strlevel, file, line, func, message);
}
int main(int argc, char *argv[])
{
umask(077);
char *cfg_file_path;
LOG_BACKEND log_backend;
bool run_in_foreground;
// choose backend for printing command line argument parsing output based on whether the daemon is being run from a terminal
log_backend = isatty(STDOUT_FILENO) ? LOG_BACKEND_STDOUT : LOG_BACKEND_SYSLOG;
log_open(log_backend);
handle_command_line_arguments(argc, argv, &cfg_file_path, &log_backend, &run_in_foreground);
log_close();
log_open(log_backend);
log_write(LOG_LEVEL_INFO, "Running \"%s\" version %lu.\n", DAEMON_NAME, DAEMON_VERSION_NUMBER);
char *pid_file_path, *keys_file_path;
int port;
int enable_ipv6;
int enable_ipv4_fallback;
int enable_lan_discovery;
int enable_tcp_relay;
uint16_t *tcp_relay_ports;
int tcp_relay_port_count;
int enable_motd;
char *motd;
if (get_general_config(cfg_file_path, &pid_file_path, &keys_file_path, &port, &enable_ipv6, &enable_ipv4_fallback,
&enable_lan_discovery, &enable_tcp_relay, &tcp_relay_ports, &tcp_relay_port_count, &enable_motd, &motd)) {
log_write(LOG_LEVEL_INFO, "General config read successfully\n");
} else {
log_write(LOG_LEVEL_ERROR, "Couldn't read config file: %s. Exiting.\n", cfg_file_path);
return 1;
}
if (port < MIN_ALLOWED_PORT || port > MAX_ALLOWED_PORT) {
log_write(LOG_LEVEL_ERROR, "Invalid port: %d, should be in [%d, %d]. Exiting.\n", port, MIN_ALLOWED_PORT,
MAX_ALLOWED_PORT);
return 1;
}
if (!run_in_foreground) {
daemonize(log_backend, pid_file_path);
}
free(pid_file_path);
IP ip;
ip_init(&ip, enable_ipv6);
Logger *logger = logger_new();
logger_callback_log(logger, print_log, nullptr, nullptr);
Networking_Core *net = new_networking(logger, ip, port);
if (net == nullptr) {
if (enable_ipv6 && enable_ipv4_fallback) {
log_write(LOG_LEVEL_WARNING, "Couldn't initialize IPv6 networking. Falling back to using IPv4.\n");
enable_ipv6 = 0;
ip_init(&ip, enable_ipv6);
net = new_networking(logger, ip, port);
if (net == nullptr) {
log_write(LOG_LEVEL_ERROR, "Couldn't fallback to IPv4. Exiting.\n");
logger_kill(logger);
return 1;
}
} else {
log_write(LOG_LEVEL_ERROR, "Couldn't initialize networking. Exiting.\n");
logger_kill(logger);
return 1;
}
}
Mono_Time *const mono_time = mono_time_new();
if (mono_time == nullptr) {
log_write(LOG_LEVEL_ERROR, "Couldn't initialize monotonic timer. Exiting.\n");
logger_kill(logger);
return 1;
}
mono_time_update(mono_time);
DHT *const dht = new_dht(logger, mono_time, net, true);
if (dht == nullptr) {
log_write(LOG_LEVEL_ERROR, "Couldn't initialize Tox DHT instance. Exiting.\n");
mono_time_free(mono_time);
logger_kill(logger);
return 1;
}
Onion *onion = new_onion(mono_time, dht);
Onion_Announce *onion_a = new_onion_announce(mono_time, dht);
if (!(onion && onion_a)) {
log_write(LOG_LEVEL_ERROR, "Couldn't initialize Tox Onion. Exiting.\n");
mono_time_free(mono_time);
logger_kill(logger);
return 1;
}
if (enable_motd) {
if (bootstrap_set_callbacks(dht_get_net(dht), DAEMON_VERSION_NUMBER, (uint8_t *)motd, strlen(motd) + 1) == 0) {
log_write(LOG_LEVEL_INFO, "Set MOTD successfully.\n");
} else {
log_write(LOG_LEVEL_ERROR, "Couldn't set MOTD: %s. Exiting.\n", motd);
mono_time_free(mono_time);
logger_kill(logger);
return 1;
}
free(motd);
}
if (manage_keys(dht, keys_file_path)) {
log_write(LOG_LEVEL_INFO, "Keys are managed successfully.\n");
} else {
log_write(LOG_LEVEL_ERROR, "Couldn't read/write: %s. Exiting.\n", keys_file_path);
mono_time_free(mono_time);
logger_kill(logger);
return 1;
}
free(keys_file_path);
TCP_Server *tcp_server = nullptr;
if (enable_tcp_relay) {
if (tcp_relay_port_count == 0) {
log_write(LOG_LEVEL_ERROR, "No TCP relay ports read. Exiting.\n");
mono_time_free(mono_time);
logger_kill(logger);
return 1;
}
tcp_server = new_TCP_server(enable_ipv6, tcp_relay_port_count, tcp_relay_ports, dht_get_self_secret_key(dht), onion);
// tcp_relay_port_count != 0 at this point
free(tcp_relay_ports);
if (tcp_server != nullptr) {
log_write(LOG_LEVEL_INFO, "Initialized Tox TCP server successfully.\n");
} else {
log_write(LOG_LEVEL_ERROR, "Couldn't initialize Tox TCP server. Exiting.\n");
mono_time_free(mono_time);
logger_kill(logger);
return 1;
}
}
if (bootstrap_from_config(cfg_file_path, dht, enable_ipv6)) {
log_write(LOG_LEVEL_INFO, "List of bootstrap nodes read successfully.\n");
} else {
log_write(LOG_LEVEL_ERROR, "Couldn't read list of bootstrap nodes in %s. Exiting.\n", cfg_file_path);
mono_time_free(mono_time);
logger_kill(logger);
return 1;
}
print_public_key(dht_get_self_public_key(dht));
uint64_t last_LANdiscovery = 0;
const uint16_t net_htons_port = net_htons(port);
int waiting_for_dht_connection = 1;
if (enable_lan_discovery) {
lan_discovery_init(dht);
log_write(LOG_LEVEL_INFO, "Initialized LAN discovery successfully.\n");
}
while (1) {
mono_time_update(mono_time);
do_dht(dht);
if (enable_lan_discovery && mono_time_is_timeout(mono_time, last_LANdiscovery, LAN_DISCOVERY_INTERVAL)) {
lan_discovery_send(net_htons_port, dht);
last_LANdiscovery = mono_time_get(mono_time);
}
if (enable_tcp_relay) {
do_TCP_server(tcp_server, mono_time);
}
networking_poll(dht_get_net(dht), nullptr);
if (waiting_for_dht_connection && dht_isconnected(dht)) {
log_write(LOG_LEVEL_INFO, "Connected to another bootstrap node successfully.\n");
waiting_for_dht_connection = 0;
}
SLEEP_MILLISECONDS(30);
}
}
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