Replace DEFAULT_TCP_RELAY_PORTS_COUNT with a compile-time calculation

That way we don't have to rely on a human to remember to keep
DEFAULT_TCP_RELAY_PORTS_COUNT in sync with DEFAULT_TCP_RELAY_PORTS.

other/bootstrap_daemon/docker/tox-bootstrapd.sha256

@@ -1 +1 @@
-8bf35cb22ca6d5d85f5fe8993a6ce9424d2048f9bd6a57ab45dc52a6c8444fb3  /usr/local/bin/tox-bootstrapd
+e0e1c3f1ba835f76faca9383b606ed1a5b778bd79caae9a1e3bb4bf3bfaed19a  /usr/local/bin/tox-bootstrapd

other/bootstrap_daemon/src/config.c

@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: GPL-3.0-or-later
- * Copyright © 2016-2018 The TokTok team.
+ * Copyright © 2016-2023 The TokTok team.
  * Copyright © 2014-2016 Tox project.
  */
 
@@ -39,22 +39,28 @@ static void parse_tcp_relay_ports_config(config_t *cfg, uint16_t **tcp_relay_por
         log_write(LOG_LEVEL_WARNING, "No '%s' setting in the configuration file.\n", NAME_TCP_RELAY_PORTS);
         log_write(LOG_LEVEL_WARNING, "Using default '%s':\n", NAME_TCP_RELAY_PORTS);
 
-        uint16_t default_ports[DEFAULT_TCP_RELAY_PORTS_COUNT] = {DEFAULT_TCP_RELAY_PORTS};
+        uint16_t default_ports[] = {DEFAULT_TCP_RELAY_PORTS};
 
-        for (int i = 0; i < DEFAULT_TCP_RELAY_PORTS_COUNT; ++i) {
-            log_write(LOG_LEVEL_INFO, "Port #%d: %u\n", i, default_ports[i]);
+        // Check to avoid calling malloc(0) later on
+        // NOLINTNEXTLINE, clang-tidy: error: suspicious comparison of 'sizeof(expr)' to a constant [bugprone-sizeof-expression,-warnings-as-errors]
+        static_assert(sizeof(default_ports) > 0, "At least one default TCP relay port should be provided");
+
+        const size_t default_ports_count = sizeof(default_ports)/sizeof(*default_ports);
+
+        for (size_t i = 0; i < default_ports_count; ++i) {
+            log_write(LOG_LEVEL_INFO, "Port #%zu: %u\n", i, default_ports[i]);
         }
 
         // similar procedure to the one of reading config file below
-        *tcp_relay_ports = (uint16_t *)malloc(DEFAULT_TCP_RELAY_PORTS_COUNT * sizeof(uint16_t));
+        *tcp_relay_ports = (uint16_t *)malloc(default_ports_count * sizeof(uint16_t));
 
-        for (int i = 0; i < DEFAULT_TCP_RELAY_PORTS_COUNT; ++i) {
+        for (size_t i = 0; i < default_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) {
-                log_write(LOG_LEVEL_WARNING, "Port #%d: Invalid port: %u, should be in [%d, %d]. Skipping.\n", i,
+                log_write(LOG_LEVEL_WARNING, "Port #%zu: 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;
             }

other/bootstrap_daemon/src/config_defaults.h

@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: GPL-3.0-or-later
- * Copyright © 2016-2018 The TokTok team.
+ * Copyright © 2016-2023 The TokTok team.
  * Copyright © 2014-2016 Tox project.
  */
 
@@ -19,8 +19,7 @@
 #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_TCP_RELAY_PORTS       443, 3389, 33445 // comma-separated list of ports
 #define DEFAULT_ENABLE_MOTD           1 // 1 - true, 0 - false
 #define DEFAULT_MOTD                  DAEMON_NAME