Prevent Hashcat from hanging by checking during startup that the output file is a named pipe

docs/changes.txt

@@ -34,6 +34,7 @@
 ##
 
 - Fixed keys extraction in luks2hashcat - now extracts all active keys
+- Prevent Hashcat from hanging by checking during startup that the output file is a named pipe
 
 ##
 ## Technical

include/shared.h

@@ -55,6 +55,7 @@ void *hc_bsearch_r (const void *key, const void *base, size_t nmemb, size_t size
 
 bool hc_path_is_file (const char *path);
 bool hc_path_is_directory (const char *path);
+bool hc_path_is_fifo (const char *path);
 bool hc_path_is_empty (const char *path);
 bool hc_path_exist (const char *path);
 bool hc_path_read (const char *path);

src/shared.c

@@ -340,6 +340,19 @@ bool hc_path_is_directory (const char *path)
   return false;
 }
 
+bool hc_path_is_fifo (const char *path)
+{
+  struct stat s;
+
+  memset (&s, 0, sizeof (s));
+
+  if (stat (path, &s) == -1) return false;
+
+  if (S_ISFIFO (s.st_mode) == true) return true;
+
+  return false;
+}
+
 bool hc_path_is_empty (const char *path)
 {
   struct stat s;

src/user_options.c

@@ -2731,6 +2731,13 @@ int user_options_check_files (hashcat_ctx_t *hashcat_ctx)
   {
     if (hc_path_exist (outfile_ctx->filename) == true)
     {
+      if (hc_path_is_fifo (outfile_ctx->filename) == true)
+      {
+        event_log_error (hashcat_ctx, "%s: A fifo cannot be used as an outfile.", outfile_ctx->filename);
+
+        return -1;
+      }
+
       if (hc_path_is_directory (outfile_ctx->filename) == true)
       {
         event_log_error (hashcat_ctx, "%s: A directory cannot be used as an outfile.", outfile_ctx->filename);