summaryrefslogtreecommitdiff
path: root/other/bootstrap_daemon/src/tox-bootstrapd.c
blob: 9f1a2db409e0a37af7ef7ad93d7a2362ee6d47e1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
/*
 * Tox DHT bootstrap daemon.
 * Main file.
 */

/*
 * Copyright © 2016-2017 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/>.
 */
#define _XOPEN_SOURCE 600

// 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/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);
    }
}

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);

    Networking_Core *net = new_networking(nullptr, 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(nullptr, ip, port);

            if (net == nullptr) {
                log_write(LOG_LEVEL_ERROR, "Couldn't fallback to IPv4. Exiting.\n");
                return 1;
            }
        } else {
            log_write(LOG_LEVEL_ERROR, "Couldn't initialize networking. Exiting.\n");
            return 1;
        }
    }

    DHT *dht = new_DHT(nullptr, net, true);

    if (dht == nullptr) {
        log_write(LOG_LEVEL_ERROR, "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)) {
        log_write(LOG_LEVEL_ERROR, "Couldn't initialize Tox Onion. Exiting.\n");
        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);
            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);
        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");
            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");
            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);
        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) {
        do_DHT(dht);

        if (enable_lan_discovery && is_timeout(last_LANdiscovery, LAN_DISCOVERY_INTERVAL)) {
            lan_discovery_send(net_htons_port, dht);
            last_LANdiscovery = unix_time();
        }

        if (enable_tcp_relay) {
            do_TCP_server(tcp_server);
        }

        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);
    }
}