fix: address all 7 review issues

src/shared/config.c

@@ -14,6 +14,8 @@ Config* config_create(char* version, char* send_directory, char* receive_directo
                       bool use_sendfile, unsigned long long chunk_size) {
 
   Config* config = malloc(sizeof(Config));
+  if (!config)
+    return NULL;
   config->version = version;
   config->send_directory = send_directory;
   config->receive_root_directory = receive_directory;
@@ -259,6 +261,7 @@ error:
   free(config->send_directory);
   free(config->receive_root_directory);
   free(config->server_host);
+  free(config->backup_dir);
   free(config);
   return NULL;
 }

src/shared/protocol.c

@@ -85,6 +85,11 @@ bool send_n_data(int file_descriptor, const void* data, size_t data_size) {
     else
       bytes_send = write(fd, (const char*)data + total_bytes_send, chunk);
     if (bytes_send <= 0) {
+      if (io_ssl) {
+        int ssl_err = SSL_get_error(io_ssl, (int)bytes_send);
+        if (ssl_err == SSL_ERROR_WANT_WRITE || ssl_err == SSL_ERROR_WANT_READ)
+          continue;
+      }
       log_message(LOG_LEVEL_ERROR, "Could not send data");
       return false;
     }
@@ -121,6 +126,11 @@ bool receive_n_data(int file_descriptor, void* data, size_t data_size) {
       bytes_received =
           read(fd, (char*)data + total_bytes_received, data_size - total_bytes_received);
     if (bytes_received <= 0) {
+      if (io_ssl) {
+        int ssl_err = SSL_get_error(io_ssl, (int)bytes_received);
+        if (ssl_err == SSL_ERROR_WANT_WRITE || ssl_err == SSL_ERROR_WANT_READ)
+          continue;
+      }
       if (bytes_received == 0)
         log_message(LOG_LEVEL_ERROR, "Connection closed while receiving data");
       else

src/shared/transport_tcp.c

@@ -12,7 +12,7 @@
 #include <sys/wait.h>
 #include <unistd.h>
 
-static volatile unsigned int g_active_connections = 0;
+static volatile sig_atomic_t g_active_connections = 0;
 
 static void sigchld_handler(int sig) {
   (void)sig;
@@ -92,7 +92,7 @@ static void accept_loop(Server* server, void (*child_fn)(int, void*), void* chil
       perror("Could not accept the connection");
       continue;
     }
-    if (g_active_connections >= server->max_connections) {
+    if ((unsigned int)g_active_connections >= server->max_connections) {
       log_message(LOG_LEVEL_WARNING, "Max connections (%u) reached, rejecting",
                   server->max_connections);
       close(fd);