Add logger object to be able to support multiple logging backends

1 files changed, 730 insertions, 0 deletions

diff --git a/other/bootstrap_daemon/src/tox-bootstrapd.c b/other/bootstrap_daemon/src/tox-bootstrapd.c
new file mode 100644
index 00000000..71b1386d
--- /dev/null
+++ b/other/bootstrap_daemon/src/tox-bootstrapd.c
@@ -0,0 +1,730 @@
+/* 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 2014101200UL // 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_IPV4_FALLBACK  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) {
+        const 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");
+
+        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;
+}
+
+// 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_INFO, "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
+        if ((*tcp_relay_port_count) > 0) {
+            *tcp_relay_ports = realloc(*tcp_relay_ports, (*tcp_relay_port_count) * sizeof(uint16_t));
+        } else {
+            free(*tcp_relay_ports);
+            *tcp_relay_ports = NULL;
+        }
+
+        return;
+    }
+
+    if (config_setting_is_array(ports_array) == CONFIG_FALSE) {
+        syslog(LOG_ERR, "'%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_ERR, "'%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) > 0) {
+        *tcp_relay_ports = realloc(*tcp_relay_ports, (*tcp_relay_port_count) * sizeof(uint16_t));
+    } else {
+        free(*tcp_relay_ports);
+        *tcp_relay_ports = NULL;
+    }
+}
+
+// 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(const char *cfg_file_path, char **pid_file_path, char **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)
+{
+    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_IPV4_FALLBACK = "enable_ipv4_fallback";
+    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 IPv4 fallback option
+    if (config_lookup_bool(&cfg, NAME_ENABLE_IPV4_FALLBACK, enable_ipv4_fallback) == CONFIG_FALSE) {
+        syslog(LOG_WARNING, "No '%s' setting in configuration file.\n", NAME_ENABLE_IPV4_FALLBACK);
+        syslog(LOG_WARNING, "Using default '%s': %s\n", NAME_ENABLE_IPV4_FALLBACK,
+               DEFAULT_ENABLE_IPV4_FALLBACK ? "true" : "false");
+        *enable_ipv4_fallback = DEFAULT_ENABLE_IPV4_FALLBACK;
+    }
+
+    // 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_INFO, "Successfully read:\n");
+    syslog(LOG_INFO, "'%s': %s\n", NAME_PID_FILE_PATH,        *pid_file_path);
+    syslog(LOG_INFO, "'%s': %s\n", NAME_KEYS_FILE_PATH,       *keys_file_path);
+    syslog(LOG_INFO, "'%s': %d\n", NAME_PORT,                 *port);
+    syslog(LOG_INFO, "'%s': %s\n", NAME_ENABLE_IPV6,          *enable_ipv6          ? "true" : "false");
+    syslog(LOG_INFO, "'%s': %s\n", NAME_ENABLE_IPV4_FALLBACK, *enable_ipv4_fallback ? "true" : "false");
+    syslog(LOG_INFO, "'%s': %s\n", NAME_ENABLE_LAN_DISCOVERY, *enable_lan_discovery ? "true" : "false");
+
+    syslog(LOG_INFO, "'%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_ERR, "No TCP ports could be read.\n");
+        } else {
+            syslog(LOG_INFO, "Read %d TCP ports:\n", *tcp_relay_port_count);
+            int i;
+
+            for (i = 0; i < *tcp_relay_port_count; i ++) {
+                syslog(LOG_INFO, "Port #%d: %u\n", i, (*tcp_relay_ports)[i]);
+            }
+        }
+    }
+
+    syslog(LOG_INFO, "'%s': %s\n", NAME_ENABLE_MOTD,          *enable_motd          ? "true" : "false");
+
+    if (*enable_motd) {
+        syslog(LOG_INFO, "'%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(const 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_INFO, "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(const 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;
+    }
+
+    const char *cfg_file_path = argv[1];
+    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)) {
+        syslog(LOG_INFO, "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_WARNING, "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);
+
+    Networking_Core *net = new_networking(ip, port);
+
+    if (net == NULL) {
+        if (enable_ipv6 && enable_ipv4_fallback) {
+            syslog(LOG_WARNING, "Couldn't initialize IPv6 networking. Falling back to using IPv4.\n");
+            enable_ipv6 = 0;
+            ip_init(&ip, enable_ipv6);
+            net = new_networking(ip, port);
+
+            if (net == NULL) {
+                syslog(LOG_ERR, "Couldn't fallback to IPv4. Exiting.\n");
+                return 1;
+            }
+        } else {
+            syslog(LOG_ERR, "Couldn't initialize networking. Exiting.\n");
+            return 1;
+        }
+    }
+
+
+    DHT *dht = new_DHT(net);
+
+    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_INFO, "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_INFO, "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_secret_key, onion);
+
+        // tcp_relay_port_count != 0 at this point
+        free(tcp_relay_ports);
+
+        if (tcp_server != NULL) {
+            syslog(LOG_INFO, "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_INFO, "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
+    const pid_t pid = fork();
+
+    if (pid > 0) {
+        fprintf(pidf, "%d", pid);
+        fclose(pidf);
+        syslog(LOG_INFO, "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;
+    const uint16_t htons_port = htons(port);
+
+    int waiting_for_dht_connection = 1;
+
+    if (enable_lan_discovery) {
+        LANdiscovery_init(dht);
+        syslog(LOG_INFO, "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_INFO, "Connected to other bootstrap node successfully.\n");
+            waiting_for_dht_connection = 0;
+        }
+
+        sleep;
+    }
+
+    return 1;
+}