1 files changed, 163 insertions, 0 deletions
diff --git a/grub-core/normal/crypto.c b/grub-core/normal/crypto.c
new file mode 100644
index 0000000..d01e6f2
--- /dev/null
+++ b/grub-core/normal/crypto.c
@@ -0,0 +1,163 @@
+/* crypto.c - support crypto autoload */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2009  Free Software Foundation, Inc.
+ *
+ *  GRUB 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.
+ *
+ *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/dl.h>
+#include <grub/mm.h>
+#include <grub/env.h>
+#include <grub/misc.h>
+#include <grub/crypto.h>
+#include <grub/normal.h>
+
+struct load_spec
+{
+  struct load_spec *next;
+  char *name;
+  char *modname;
+};
+
+static struct load_spec *crypto_specs = NULL;
+
+static void 
+grub_crypto_autoload (const char *name)
+{
+  struct load_spec *cur;
+  grub_dl_t mod;
+  static int depth = 0;
+
+  /* Some bufio of filesystems may want some crypto modules.
+     It may result in infinite recursion. Hence this check.  */
+  if (depth)
+    return;
+  depth++;
+
+  for (cur = crypto_specs; cur; cur = cur->next)
+    if (grub_strcasecmp (name, cur->name) == 0)
+      {
+	mod = grub_dl_load (cur->modname);
+	if (mod)
+	  grub_dl_ref (mod);
+	grub_errno = GRUB_ERR_NONE;
+      }
+  depth--;
+}
+
+static void 
+grub_crypto_spec_free (void)
+{
+  struct load_spec *cur, *next;
+  for (cur = crypto_specs; cur; cur = next)
+    {
+      next = cur->next;
+      grub_free (cur->name);
+      grub_free (cur->modname);
+      grub_free (cur);
+    }
+  crypto_specs = NULL;
+}
+
+
+/* Read the file crypto.lst for auto-loading.  */
+void
+read_crypto_list (const char *prefix)
+{
+  char *filename;
+  grub_file_t file;
+  char *buf = NULL;
+
+  if (!prefix)
+    {
+      grub_errno = GRUB_ERR_NONE;
+      return;
+    }
+  
+  filename = grub_xasprintf ("%s/" GRUB_TARGET_CPU "-" GRUB_PLATFORM
+			     "/crypto.lst", prefix);
+  if (!filename)
+    {
+      grub_errno = GRUB_ERR_NONE;
+      return;
+    }
+
+  file = grub_file_open (filename, GRUB_FILE_TYPE_GRUB_MODULE_LIST);
+  grub_free (filename);
+  if (!file)
+    {
+      grub_errno = GRUB_ERR_NONE;
+      return;
+    }
+
+  /* Override previous crypto.lst.  */
+  grub_crypto_spec_free ();
+
+  for (;; grub_free (buf))
+    {
+      char *p, *name;
+      struct load_spec *cur;
+      
+      buf = grub_file_getline (file);
+	
+      if (! buf)
+	break;
+      
+      name = buf;
+      while (grub_isspace (name[0]))
+	name++;
+
+      p = grub_strchr (name, ':');
+      if (! p)
+	continue;
+      
+      *p = '\0';
+      p++;
+      while (*p == ' ' || *p == '\t')
+	p++;
+
+      cur = grub_malloc (sizeof (*cur));
+      if (!cur)
+	{
+	  grub_errno = GRUB_ERR_NONE;
+	  continue;
+	}
+      
+      cur->name = grub_strdup (name);
+      if (! cur->name)
+	{
+	  grub_errno = GRUB_ERR_NONE;
+	  grub_free (cur);
+	  continue;
+	}
+	
+      cur->modname = grub_strdup (p);
+      if (! cur->modname)
+	{
+	  grub_errno = GRUB_ERR_NONE;
+	  grub_free (cur->name);
+	  grub_free (cur);
+	  continue;
+	}
+      cur->next = crypto_specs;
+      crypto_specs = cur;
+    }
+  
+  grub_file_close (file);
+
+  grub_errno = GRUB_ERR_NONE;
+
+  grub_crypto_autoload_hook = grub_crypto_autoload;
+}