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toxcore/other/bootstrap_daemon/tox-bootstrapd.c

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/* tox-bootstrapd.c
*
* Tox DHT bootstrap daemon.
*
* Copyright (C) 2014 Tox project All Rights Reserved.
*
* This file is part of Tox.
*
* Tox is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Tox is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Tox. If not, see <http://www.gnu.org/licenses/>.
*
*/
// system provided
#include <arpa/inet.h>
#include <syslog.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
// C
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// 3rd party
#include <libconfig.h>
// ./configure
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
// toxcore
#include "../../toxcore/LAN_discovery.h"
#include "../../toxcore/onion_announce.h"
#include "../../toxcore/TCP_server.h"
#include "../../toxcore/util.h"
// misc
#include "../bootstrap_node_packets.c"
#include "../../testing/misc_tools.c"
#define DAEMON_NAME "tox-bootstrapd"
#define DAEMON_VERSION_NUMBER 2014101000UL // yyyymmmddvv format: yyyy year, mm month, dd day, vv version change count for that day
#define SLEEP_TIME_MILLISECONDS 30
#define sleep usleep(1000*SLEEP_TIME_MILLISECONDS)
#define DEFAULT_PID_FILE_PATH "tox-bootstrapd.pid"
#define DEFAULT_KEYS_FILE_PATH "tox-bootstrapd.keys"
#define DEFAULT_PORT 33445
#define DEFAULT_ENABLE_IPV6 1 // 1 - true, 0 - false
#define DEFAULT_ENABLE_LAN_DISCOVERY 1 // 1 - true, 0 - false
#define DEFAULT_ENABLE_TCP_RELAY 1 // 1 - true, 0 - false
#define DEFAULT_TCP_RELAY_PORTS 443, 3389, 33445 // comma-separated list of ports. make sure to adjust DEFAULT_TCP_RELAY_PORTS_COUNT accordingly
#define DEFAULT_TCP_RELAY_PORTS_COUNT 3
#define DEFAULT_ENABLE_MOTD 1 // 1 - true, 0 - false
#define DEFAULT_MOTD DAEMON_NAME
#define MIN_ALLOWED_PORT 1
#define MAX_ALLOWED_PORT 65535
// Uses the already existing key or creates one if it didn't exist
//
// retirns 1 on success
// 0 on failure - no keys were read or stored
int manage_keys(DHT *dht, char *keys_file_path)
{
const uint32_t KEYS_SIZE = crypto_box_PUBLICKEYBYTES + crypto_box_SECRETKEYBYTES;
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 != NULL) {
size_t read_size = fread(keys, sizeof(uint8_t), KEYS_SIZE, keys_file);
if (read_size != KEYS_SIZE) {
fclose(keys_file);
return 0;
}
memcpy(dht->self_public_key, keys, crypto_box_PUBLICKEYBYTES);
memcpy(dht->self_secret_key, keys + crypto_box_PUBLICKEYBYTES, crypto_box_SECRETKEYBYTES);
} else {
// Otherwise save new keys
memcpy(keys, dht->self_public_key, crypto_box_PUBLICKEYBYTES);
memcpy(keys + crypto_box_PUBLICKEYBYTES, dht->self_secret_key, crypto_box_SECRETKEYBYTES);
keys_file = fopen(keys_file_path, "w");
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;
}
// Parses tcp relay ports from `cfg` and puts them into `tcp_relay_ports` array
//
// Supposed to be called from get_general_config only
//
// Important: iff `tcp_relay_port_count` > 0, then you are responsible for freeing `tcp_relay_ports`
void parse_tcp_relay_ports_config(config_t *cfg, uint16_t **tcp_relay_ports, int *tcp_relay_port_count)
{
const char *NAME_TCP_RELAY_PORTS = "tcp_relay_ports";
*tcp_relay_port_count = 0;
config_setting_t *ports_array = config_lookup(cfg, NAME_TCP_RELAY_PORTS);
if (ports_array == NULL) {
syslog(LOG_WARNING, "No '%s' setting in the configuration file.\n", NAME_TCP_RELAY_PORTS);
syslog(LOG_WARNING, "Using default '%s':\n", NAME_TCP_RELAY_PORTS);
uint16_t default_ports[DEFAULT_TCP_RELAY_PORTS_COUNT] = {DEFAULT_TCP_RELAY_PORTS};
int i;
for (i = 0; i < DEFAULT_TCP_RELAY_PORTS_COUNT; i ++) {
syslog(LOG_WARNING, "Port #%d: %u\n", i, default_ports[i]);
}
// similar procedure to the one of reading config file below
*tcp_relay_ports = malloc(DEFAULT_TCP_RELAY_PORTS_COUNT * sizeof(uint16_t));
for (i = 0; i < DEFAULT_TCP_RELAY_PORTS_COUNT; i ++) {
(*tcp_relay_ports)[*tcp_relay_port_count] = default_ports[i];
if ((*tcp_relay_ports)[*tcp_relay_port_count] < MIN_ALLOWED_PORT
|| (*tcp_relay_ports)[*tcp_relay_port_count] > MAX_ALLOWED_PORT) {
syslog(LOG_WARNING, "Port #%d: Invalid port: %u, should be in [%d, %d]. Skipping.\n", i,
(*tcp_relay_ports)[*tcp_relay_port_count], MIN_ALLOWED_PORT, MAX_ALLOWED_PORT);
continue;
}
(*tcp_relay_port_count) ++;
}
// the loop above skips invalid ports, so we adjust the allocated memory size
*tcp_relay_ports = realloc(*tcp_relay_ports, (*tcp_relay_port_count) * sizeof(uint16_t));
return;
}
if (config_setting_is_array(ports_array) == CONFIG_FALSE) {
syslog(LOG_WARNING, "'%s' setting should be an array. Array syntax: 'setting = [value1, value2, ...]'.\n",
NAME_TCP_RELAY_PORTS);
return;
}
int config_port_count = config_setting_length(ports_array);
if (config_port_count == 0) {
syslog(LOG_WARNING, "'%s' is empty.\n", NAME_TCP_RELAY_PORTS);
return;
}
*tcp_relay_ports = malloc(config_port_count * sizeof(uint16_t));
int i;
for (i = 0; i < config_port_count; i ++) {
config_setting_t *elem = config_setting_get_elem(ports_array, i);
if (elem == NULL) {
// it's NULL if `ports_array` is not an array (we have that check earlier) or if `i` is out of range, which should not be
syslog(LOG_WARNING, "Port #%d: Something went wrong while parsing the port. Stopping reading ports.\n", i);
break;
}
if (config_setting_is_number(elem) == CONFIG_FALSE) {
syslog(LOG_WARNING, "Port #%d: Not a number. Skipping.\n", i);
continue;
}
(*tcp_relay_ports)[*tcp_relay_port_count] = config_setting_get_int(elem);
if ((*tcp_relay_ports)[*tcp_relay_port_count] < MIN_ALLOWED_PORT
|| (*tcp_relay_ports)[*tcp_relay_port_count] > MAX_ALLOWED_PORT) {
syslog(LOG_WARNING, "Port #%d: Invalid port: %u, should be in [%d, %d]. Skipping.\n", i,
(*tcp_relay_ports)[*tcp_relay_port_count], MIN_ALLOWED_PORT, MAX_ALLOWED_PORT);
continue;
}
(*tcp_relay_port_count) ++;
}
// the loop above skips invalid ports, so we adjust the allocated memory size
if ((*tcp_relay_port_count) * sizeof(uint16_t) > 0) {
*tcp_relay_ports = realloc(*tcp_relay_ports, (*tcp_relay_port_count) * sizeof(uint16_t));
}
}
// Gets general config options
//
// Important: you are responsible for freeing `pid_file_path` and `keys_file_path`
// also, iff `tcp_relay_ports_count` > 0, then you are responsible for freeing `tcp_relay_ports`
// and also `motd` iff `enable_motd` is set
//
// returns 1 on success
// 0 on failure, doesn't modify any data pointed by arguments
int get_general_config(char *cfg_file_path, char **pid_file_path, char **keys_file_path, int *port, int *enable_ipv6,
int *enable_lan_discovery, int *enable_tcp_relay, uint16_t **tcp_relay_ports, int *tcp_relay_port_count,
int *enable_motd, char **motd)
{
config_t cfg;
const char *NAME_PORT = "port";
const char *NAME_PID_FILE_PATH = "pid_file_path";
const char *NAME_KEYS_FILE_PATH = "keys_file_path";
const char *NAME_ENABLE_IPV6 = "enable_ipv6";
const char *NAME_ENABLE_LAN_DISCOVERY = "enable_lan_discovery";
const char *NAME_ENABLE_TCP_RELAY = "enable_tcp_relay";
const char *NAME_ENABLE_MOTD = "enable_motd";
const char *NAME_MOTD = "motd";
config_init(&cfg);
// Read the file. If there is an error, report it and exit.
if (config_read_file(&cfg, cfg_file_path) == CONFIG_FALSE) {
syslog(LOG_ERR, "%s:%d - %s\n", config_error_file(&cfg), config_error_line(&cfg), config_error_text(&cfg));
config_destroy(&cfg);
return 0;
}
// Get port
if (config_lookup_int(&cfg, NAME_PORT, port) == CONFIG_FALSE) {
syslog(LOG_WARNING, "No '%s' setting in configuration file.\n", NAME_PORT);
syslog(LOG_WARNING, "Using default '%s': %d\n", NAME_PORT, DEFAULT_PORT);
*port = DEFAULT_PORT;
}
// Get PID file location
const char *tmp_pid_file;
if (config_lookup_string(&cfg, NAME_PID_FILE_PATH, &tmp_pid_file) == CONFIG_FALSE) {
syslog(LOG_WARNING, "No '%s' setting in configuration file.\n", NAME_PID_FILE_PATH);
syslog(LOG_WARNING, "Using default '%s': %s\n", NAME_PID_FILE_PATH, DEFAULT_PID_FILE_PATH);
tmp_pid_file = DEFAULT_PID_FILE_PATH;
}
*pid_file_path = malloc(strlen(tmp_pid_file) + 1);
strcpy(*pid_file_path, tmp_pid_file);
// Get keys file location
const char *tmp_keys_file;
if (config_lookup_string(&cfg, NAME_KEYS_FILE_PATH, &tmp_keys_file) == CONFIG_FALSE) {
syslog(LOG_WARNING, "No '%s' setting in configuration file.\n", NAME_KEYS_FILE_PATH);
syslog(LOG_WARNING, "Using default '%s': %s\n", NAME_KEYS_FILE_PATH, DEFAULT_KEYS_FILE_PATH);
tmp_keys_file = DEFAULT_KEYS_FILE_PATH;
}
*keys_file_path = malloc(strlen(tmp_keys_file) + 1);
strcpy(*keys_file_path, tmp_keys_file);
// Get IPv6 option
if (config_lookup_bool(&cfg, NAME_ENABLE_IPV6, enable_ipv6) == CONFIG_FALSE) {
syslog(LOG_WARNING, "No '%s' setting in configuration file.\n", NAME_ENABLE_IPV6);
syslog(LOG_WARNING, "Using default '%s': %s\n", NAME_ENABLE_IPV6, DEFAULT_ENABLE_IPV6 ? "true" : "false");
*enable_ipv6 = DEFAULT_ENABLE_IPV6;
}
// Get LAN discovery option
if (config_lookup_bool(&cfg, NAME_ENABLE_LAN_DISCOVERY, enable_lan_discovery) == CONFIG_FALSE) {
syslog(LOG_WARNING, "No '%s' setting in configuration file.\n", NAME_ENABLE_LAN_DISCOVERY);
syslog(LOG_WARNING, "Using default '%s': %s\n", NAME_ENABLE_LAN_DISCOVERY,
DEFAULT_ENABLE_LAN_DISCOVERY ? "true" : "false");
*enable_lan_discovery = DEFAULT_ENABLE_LAN_DISCOVERY;
}
// Get TCP relay option
if (config_lookup_bool(&cfg, NAME_ENABLE_TCP_RELAY, enable_tcp_relay) == CONFIG_FALSE) {
syslog(LOG_WARNING, "No '%s' setting in configuration file.\n", NAME_ENABLE_TCP_RELAY);
syslog(LOG_WARNING, "Using default '%s': %s\n", NAME_ENABLE_TCP_RELAY,
DEFAULT_ENABLE_TCP_RELAY ? "true" : "false");
*enable_tcp_relay = DEFAULT_ENABLE_TCP_RELAY;
}
if (*enable_tcp_relay) {
parse_tcp_relay_ports_config(&cfg, tcp_relay_ports, tcp_relay_port_count);
} else {
*tcp_relay_port_count = 0;
}
// Get MOTD option
if (config_lookup_bool(&cfg, NAME_ENABLE_MOTD, enable_motd) == CONFIG_FALSE) {
syslog(LOG_WARNING, "No '%s' setting in configuration file.\n", NAME_ENABLE_MOTD);
syslog(LOG_WARNING, "Using default '%s': %s\n", NAME_ENABLE_MOTD,
DEFAULT_ENABLE_MOTD ? "true" : "false");
*enable_motd = DEFAULT_ENABLE_MOTD;
}
if (*enable_motd) {
// Get MOTD
const char *tmp_motd;
if (config_lookup_string(&cfg, NAME_MOTD, &tmp_motd) == CONFIG_FALSE) {
syslog(LOG_WARNING, "No '%s' setting in configuration file.\n", NAME_MOTD);
syslog(LOG_WARNING, "Using default '%s': %s\n", NAME_MOTD, DEFAULT_MOTD);
tmp_motd = DEFAULT_MOTD;
}
size_t tmp_motd_length = strlen(tmp_motd) + 1;
size_t motd_length = tmp_motd_length > MAX_MOTD_LENGTH ? MAX_MOTD_LENGTH : tmp_motd_length;
*motd = malloc(motd_length);
strncpy(*motd, tmp_motd, motd_length);
(*motd)[motd_length - 1] = '\0';
}
config_destroy(&cfg);
syslog(LOG_DEBUG, "Successfully read:\n");
syslog(LOG_DEBUG, "'%s': %s\n", NAME_PID_FILE_PATH, *pid_file_path);
syslog(LOG_DEBUG, "'%s': %s\n", NAME_KEYS_FILE_PATH, *keys_file_path);
syslog(LOG_DEBUG, "'%s': %d\n", NAME_PORT, *port);
syslog(LOG_DEBUG, "'%s': %s\n", NAME_ENABLE_IPV6, *enable_ipv6 ? "true" : "false");
syslog(LOG_DEBUG, "'%s': %s\n", NAME_ENABLE_LAN_DISCOVERY, *enable_lan_discovery ? "true" : "false");
syslog(LOG_DEBUG, "'%s': %s\n", NAME_ENABLE_TCP_RELAY, *enable_tcp_relay ? "true" : "false");
// show info about tcp ports only if tcp relay is enabled
if (*enable_tcp_relay) {
if (*tcp_relay_port_count == 0) {
syslog(LOG_DEBUG, "No TCP ports could be read.\n");
} else {
syslog(LOG_DEBUG, "Read %d TCP ports:\n", *tcp_relay_port_count);
int i;
for (i = 0; i < *tcp_relay_port_count; i ++) {
syslog(LOG_DEBUG, "Port #%d: %u\n", i, (*tcp_relay_ports)[i]);
}
}
}
syslog(LOG_DEBUG, "'%s': %s\n", NAME_ENABLE_MOTD, *enable_motd ? "true" : "false");
if (*enable_motd) {
syslog(LOG_DEBUG, "'%s': %s\n", NAME_MOTD, *motd);
}
return 1;
}
// Bootstraps nodes listed in the config file
//
// returns 1 on success, some or no bootstrap nodes were added
// 0 on failure, a error accured while parsing config file
int bootstrap_from_config(char *cfg_file_path, DHT *dht, int enable_ipv6)
{
const char *NAME_BOOTSTRAP_NODES = "bootstrap_nodes";
const char *NAME_PUBLIC_KEY = "public_key";
const char *NAME_PORT = "port";
const char *NAME_ADDRESS = "address";
config_t cfg;
config_init(&cfg);
if (config_read_file(&cfg, cfg_file_path) == CONFIG_FALSE) {
syslog(LOG_ERR, "%s:%d - %s\n", config_error_file(&cfg), config_error_line(&cfg), config_error_text(&cfg));
config_destroy(&cfg);
return 0;
}
config_setting_t *node_list = config_lookup(&cfg, NAME_BOOTSTRAP_NODES);
if (node_list == NULL) {
syslog(LOG_WARNING, "No '%s' setting in the configuration file. Skipping bootstrapping.\n", NAME_BOOTSTRAP_NODES);
config_destroy(&cfg);
return 1;
}
if (config_setting_length(node_list) == 0) {
syslog(LOG_WARNING, "No bootstrap nodes found. Skipping bootstrapping.\n");
config_destroy(&cfg);
return 1;
}
int bs_port;
const char *bs_address;
const char *bs_public_key;
config_setting_t *node;
int i = 0;
while (config_setting_length(node_list)) {
node = config_setting_get_elem(node_list, 0);
if (node == NULL) {
config_destroy(&cfg);
return 0;
}
// Check that all settings are present
if (config_setting_lookup_string(node, NAME_PUBLIC_KEY, &bs_public_key) == CONFIG_FALSE) {
syslog(LOG_WARNING, "Bootstrap node #%d: Couldn't find '%s' setting. Skipping the node.\n", i, NAME_PUBLIC_KEY);
goto next;
}
if (config_setting_lookup_int(node, NAME_PORT, &bs_port) == CONFIG_FALSE) {
syslog(LOG_WARNING, "Bootstrap node #%d: Couldn't find '%s' setting. Skipping the node.\n", i, NAME_PORT);
goto next;
}
if (config_setting_lookup_string(node, NAME_ADDRESS, &bs_address) == CONFIG_FALSE) {
syslog(LOG_WARNING, "Bootstrap node #%d: Couldn't find '%s' setting. Skipping the node.\n", i, NAME_ADDRESS);
goto next;
}
// Process settings
if (strlen(bs_public_key) != crypto_box_PUBLICKEYBYTES * 2) {
syslog(LOG_WARNING, "Bootstrap node #%d: Invalid '%s': %s. Skipping the node.\n", i, NAME_PUBLIC_KEY,
bs_public_key);
goto next;
}
if (bs_port < MIN_ALLOWED_PORT || bs_port > MAX_ALLOWED_PORT) {
syslog(LOG_WARNING, "Bootstrap node #%d: Invalid '%s': %d, should be in [%d, %d]. Skipping the node.\n", i, NAME_PORT,
bs_port, MIN_ALLOWED_PORT, MAX_ALLOWED_PORT);
goto next;
}
uint8_t *bs_public_key_bin = hex_string_to_bin((char *)bs_public_key);
const int address_resolved = DHT_bootstrap_from_address(dht, bs_address, enable_ipv6, htons(bs_port),
bs_public_key_bin);
free(bs_public_key_bin);
if (!address_resolved) {
syslog(LOG_WARNING, "Bootstrap node #%d: Invalid '%s': %s. Skipping the node.\n", i, NAME_ADDRESS, bs_address);
goto next;
}
syslog(LOG_DEBUG, "Successfully added bootstrap node #%d: %s:%d %s\n", i, bs_address, bs_port, bs_public_key);
next:
// config_setting_lookup_string() allocates string inside and doesn't allow us to free it direcly
// though it's freed when the element is removed, so we free it right away in order to keep memory
// consumption minimal
config_setting_remove_elem(node_list, 0);
i++;
}
config_destroy(&cfg);
return 1;
}
// Prints public key
void print_public_key(uint8_t *public_key)
{
char buffer[2 * crypto_box_PUBLICKEYBYTES + 1];
int index = 0;
size_t i;
for (i = 0; i < crypto_box_PUBLICKEYBYTES; i++) {
index += sprintf(buffer + index, "%02hhX", public_key[i]);
}
syslog(LOG_INFO, "Public Key: %s\n", buffer);
return;
}
int main(int argc, char *argv[])
{
openlog(DAEMON_NAME, LOG_NOWAIT | LOG_PID, LOG_DAEMON);
syslog(LOG_INFO, "Running \"%s\" version %lu.\n", DAEMON_NAME, DAEMON_VERSION_NUMBER);
if (argc < 2) {
syslog(LOG_ERR, "Please specify a path to a configuration file as the first argument. Exiting.\n");
return 1;
}
char *cfg_file_path = argv[1];
char *pid_file_path, *keys_file_path;
int port;
int enable_ipv6;
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_lan_discovery,
&enable_tcp_relay, &tcp_relay_ports, &tcp_relay_port_count, &enable_motd, &motd)) {
syslog(LOG_DEBUG, "General config read successfully\n");
} else {
syslog(LOG_ERR, "Couldn't read config file: %s. Exiting.\n", cfg_file_path);
return 1;
}
if (port < MIN_ALLOWED_PORT || port > MAX_ALLOWED_PORT) {
syslog(LOG_ERR, "Invalid port: %d, should be in [%d, %d]. Exiting.\n", port, MIN_ALLOWED_PORT, MAX_ALLOWED_PORT);
return 1;
}
// Check if the PID file exists
FILE *pid_file;
if ((pid_file = fopen(pid_file_path, "r"))) {
syslog(LOG_ERR, "Another instance of the daemon is already running, PID file %s exists.\n", pid_file_path);
fclose(pid_file);
}
IP ip;
ip_init(&ip, enable_ipv6);
DHT *dht = new_DHT(new_networking(ip, port));
if (dht == NULL) {
syslog(LOG_ERR, "Couldn't initialize Tox DHT instance. Exiting.\n");
return 1;
}
Onion *onion = new_onion(dht);
Onion_Announce *onion_a = new_onion_announce(dht);
if (!(onion && onion_a)) {
syslog(LOG_ERR, "Couldn't initialize Tox Onion. Exiting.\n");
return 1;
}
if (enable_motd) {
if (bootstrap_set_callbacks(dht->net, DAEMON_VERSION_NUMBER, (uint8_t *)motd, strlen(motd) + 1) == 0) {
syslog(LOG_DEBUG, "Set MOTD successfully.\n");
} else {
syslog(LOG_ERR, "Couldn't set MOTD: %s. Exiting.\n", motd);
return 1;
}
free(motd);
}
if (manage_keys(dht, keys_file_path)) {
syslog(LOG_DEBUG, "Keys are managed successfully.\n");
} else {
syslog(LOG_ERR, "Couldn't read/write: %s. Exiting.\n", keys_file_path);
return 1;
}
TCP_Server *tcp_server = NULL;
if (enable_tcp_relay) {
if (tcp_relay_port_count == 0) {
syslog(LOG_ERR, "No TCP relay ports read. Exiting.\n");
return 1;
}
tcp_server = new_TCP_server(enable_ipv6, tcp_relay_port_count, tcp_relay_ports, dht->self_public_key,
dht->self_secret_key, onion);
// tcp_relay_port_count != 0 at this point
free(tcp_relay_ports);
if (tcp_server != NULL) {
syslog(LOG_DEBUG, "Initialized Tox TCP server successfully.\n");
} else {
syslog(LOG_ERR, "Couldn't initialize Tox TCP server. Exiting.\n");
return 1;
}
}
if (bootstrap_from_config(cfg_file_path, dht, enable_ipv6)) {
syslog(LOG_DEBUG, "List of bootstrap nodes read successfully.\n");
} else {
syslog(LOG_ERR, "Couldn't read list of bootstrap nodes in %s. Exiting.\n", cfg_file_path);
return 1;
}
print_public_key(dht->self_public_key);
// Write the PID file
FILE *pidf = fopen(pid_file_path, "a+");
if (pidf == NULL) {
syslog(LOG_ERR, "Couldn't open the PID file for writing: %s. Exiting.\n", pid_file_path);
return 1;
}
free(pid_file_path);
free(keys_file_path);
// Fork off from the parent process
pid_t pid = fork();
if (pid > 0) {
fprintf(pidf, "%d", pid);
fclose(pidf);
syslog(LOG_DEBUG, "Forked successfully: PID: %d.\n", pid);
return 0;
} else {
fclose(pidf);
}
if (pid < 0) {
syslog(LOG_ERR, "Forking failed. Exiting.\n");
return 1;
}
// Change the file mode mask
umask(0);
// Create a new SID for the child process
if (setsid() < 0) {
syslog(LOG_ERR, "SID creation failure. Exiting.\n");
return 1;
}
// Change the current working directory
if ((chdir("/")) < 0) {
syslog(LOG_ERR, "Couldn't change working directory to '/'. Exiting.\n");
return 1;
}
// Go quiet
close(STDOUT_FILENO);
close(STDIN_FILENO);
close(STDERR_FILENO);
uint64_t last_LANdiscovery = 0;
uint16_t htons_port = htons(port);
int waiting_for_dht_connection = 1;
if (enable_lan_discovery) {
LANdiscovery_init(dht);
syslog(LOG_DEBUG, "Initialized LAN discovery.\n");
}
while (1) {
do_DHT(dht);
if (enable_lan_discovery && is_timeout(last_LANdiscovery, LAN_DISCOVERY_INTERVAL)) {
send_LANdiscovery(htons_port, dht);
last_LANdiscovery = unix_time();
}
if (enable_tcp_relay) {
do_TCP_server(tcp_server);
}
networking_poll(dht->net);
if (waiting_for_dht_connection && DHT_isconnected(dht)) {
syslog(LOG_DEBUG, "Connected to other bootstrap node successfully.\n");
waiting_for_dht_connection = 0;
}
sleep;
}
return 1;
}
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