1 files changed, 426 insertions, 0 deletions

diff --git a/other/bootstrap_daemon/src/config.c b/other/bootstrap_daemon/src/config.c
new file mode 100644
index 00000000..861a3803
--- /dev/null
+++ b/other/bootstrap_daemon/src/config.c
@@ -0,0 +1,426 @@
+/* config.c
+ *
+ * Tox DHT bootstrap daemon.
+ * Functionality related to dealing with the config file.
+ *
+ *  Copyright (C) 2014-2016 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/>.
+ *
+ */
+
+#include "config.h"
+
+#include "config_defaults.h"
+#include "log.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <string.h>
+
+#include <libconfig.h>
+
+#include "../../bootstrap_node_packets.h"
+
+/**
+ * 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) {
+        write_log(LOG_LEVEL_WARNING, "No '%s' setting in the configuration file.\n", NAME_TCP_RELAY_PORTS);
+        write_log(LOG_LEVEL_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 ++) {
+            write_log(LOG_LEVEL_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) {
+                write_log(LOG_LEVEL_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) {
+        write_log(LOG_LEVEL_ERROR, "'%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) {
+        write_log(LOG_LEVEL_ERROR, "'%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
+            write_log(LOG_LEVEL_WARNING, "Port #%d: Something went wrong while parsing the port. Stopping reading ports.\n", i);
+            break;
+        }
+
+        if (config_setting_is_number(elem) == CONFIG_FALSE) {
+            write_log(LOG_LEVEL_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) {
+            write_log(LOG_LEVEL_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;
+    }
+}
+
+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) {
+        write_log(LOG_LEVEL_ERROR, "%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) {
+        write_log(LOG_LEVEL_WARNING, "No '%s' setting in configuration file.\n", NAME_PORT);
+        write_log(LOG_LEVEL_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) {
+        write_log(LOG_LEVEL_WARNING, "No '%s' setting in configuration file.\n", NAME_PID_FILE_PATH);
+        write_log(LOG_LEVEL_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) {
+        write_log(LOG_LEVEL_WARNING, "No '%s' setting in configuration file.\n", NAME_KEYS_FILE_PATH);
+        write_log(LOG_LEVEL_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) {
+        write_log(LOG_LEVEL_WARNING, "No '%s' setting in configuration file.\n", NAME_ENABLE_IPV6);
+        write_log(LOG_LEVEL_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) {
+        write_log(LOG_LEVEL_WARNING, "No '%s' setting in configuration file.\n", NAME_ENABLE_IPV4_FALLBACK);
+        write_log(LOG_LEVEL_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) {
+        write_log(LOG_LEVEL_WARNING, "No '%s' setting in configuration file.\n", NAME_ENABLE_LAN_DISCOVERY);
+        write_log(LOG_LEVEL_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) {
+        write_log(LOG_LEVEL_WARNING, "No '%s' setting in configuration file.\n", NAME_ENABLE_TCP_RELAY);
+        write_log(LOG_LEVEL_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) {
+        write_log(LOG_LEVEL_WARNING, "No '%s' setting in configuration file.\n", NAME_ENABLE_MOTD);
+        write_log(LOG_LEVEL_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) {
+            write_log(LOG_LEVEL_WARNING, "No '%s' setting in configuration file.\n", NAME_MOTD);
+            write_log(LOG_LEVEL_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);
+
+    write_log(LOG_LEVEL_INFO, "Successfully read:\n");
+    write_log(LOG_LEVEL_INFO, "'%s': %s\n", NAME_PID_FILE_PATH,        *pid_file_path);
+    write_log(LOG_LEVEL_INFO, "'%s': %s\n", NAME_KEYS_FILE_PATH,       *keys_file_path);
+    write_log(LOG_LEVEL_INFO, "'%s': %d\n", NAME_PORT,                 *port);
+    write_log(LOG_LEVEL_INFO, "'%s': %s\n", NAME_ENABLE_IPV6,          *enable_ipv6          ? "true" : "false");
+    write_log(LOG_LEVEL_INFO, "'%s': %s\n", NAME_ENABLE_IPV4_FALLBACK, *enable_ipv4_fallback ? "true" : "false");
+    write_log(LOG_LEVEL_INFO, "'%s': %s\n", NAME_ENABLE_LAN_DISCOVERY, *enable_lan_discovery ? "true" : "false");
+
+    write_log(LOG_LEVEL_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) {
+            write_log(LOG_LEVEL_ERROR, "No TCP ports could be read.\n");
+        } else {
+            write_log(LOG_LEVEL_INFO, "Read %d TCP ports:\n", *tcp_relay_port_count);
+            int i;
+
+            for (i = 0; i < *tcp_relay_port_count; i ++) {
+                write_log(LOG_LEVEL_INFO, "Port #%d: %u\n", i, (*tcp_relay_ports)[i]);
+            }
+        }
+    }
+
+    write_log(LOG_LEVEL_INFO, "'%s': %s\n", NAME_ENABLE_MOTD,          *enable_motd          ? "true" : "false");
+
+    if (*enable_motd) {
+        write_log(LOG_LEVEL_INFO, "'%s': %s\n", NAME_MOTD, *motd);
+    }
+
+    return 1;
+}
+
+/**
+ *
+ * Converts a hex string with even number of characters into binary.
+ *
+ * Important: You are responsible for freeing the return value.
+ *
+ * @return binary on success,
+ *         NULL on failure.
+ */
+uint8_t *hex_string_to_bin(char *hex_string)
+{
+    if (strlen(hex_string) % 2 != 0) {
+        return NULL;
+    }
+
+    size_t len = strlen(hex_string) / 2;
+    uint8_t *ret = malloc(len);
+
+    char *pos = hex_string;
+    size_t i;
+    for (i = 0; i < len; ++i, pos += 2) {
+        sscanf(pos, "%2hhx", &ret[i]);
+    }
+
+    return ret;
+}
+
+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) {
+        write_log(LOG_LEVEL_ERROR, "%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) {
+        write_log(LOG_LEVEL_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) {
+        write_log(LOG_LEVEL_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) {
+            write_log(LOG_LEVEL_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) {
+            write_log(LOG_LEVEL_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) {
+            write_log(LOG_LEVEL_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) {
+            write_log(LOG_LEVEL_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) {
+            write_log(LOG_LEVEL_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) {
+            write_log(LOG_LEVEL_WARNING, "Bootstrap node #%d: Invalid '%s': %s. Skipping the node.\n", i, NAME_ADDRESS, bs_address);
+            goto next;
+        }
+
+        write_log(LOG_LEVEL_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;
+}