[PATCH v5 15/20] Try mac/guid/etc before grub.cfg on tftp config files

[Robbie Harwood]

From: Peter Jones <pjones@redhat.com>

Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Robbie Harwood <rharwood@redhat.com>
---
 grub-core/kern/ieee1275/init.c |  28 +++----
 grub-core/net/net.c            |   2 +-
 grub-core/normal/main.c        | 129 +++++++++++++++++----------------
 3 files changed, 82 insertions(+), 77 deletions(-)

diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c
index bd9a4804bc..2e8b695e56 100644
--- a/grub-core/kern/ieee1275/init.c
+++ b/grub-core/kern/ieee1275/init.c
@@ -165,23 +165,25 @@ grub_machine_get_bootlocation (char **device, char **path)
       grub_free (canon);
     }
   else
-    *device = grub_ieee1275_encode_devname (bootpath);
-  grub_free (type);
-
-  filename = grub_ieee1275_get_filename (bootpath);
-  if (filename)
     {
-      char *lastslash = grub_strrchr (filename, '\\');
-
-      /* Truncate at last directory.  */
-      if (lastslash)
+      filename = grub_ieee1275_get_filename (bootpath);
+      if (filename)
         {
-         *lastslash = '\0';
-         grub_translate_ieee1275_path (filename);
+          char *lastslash = grub_strrchr (filename, '\\');
 
-         *path = filename;
-       }
+          /* Truncate at last directory.  */
+          if (lastslash)
+            {
+              *lastslash = '\0';
+              grub_translate_ieee1275_path (filename);
+
+              *path = filename;
+            }
+        }
+      *device = grub_ieee1275_encode_devname (bootpath);
     }
+
+  grub_free (type);
   grub_free (bootpath);
 }
 
diff --git a/grub-core/net/net.c b/grub-core/net/net.c
index 38754a94f6..83e9f92573 100644
--- a/grub-core/net/net.c
+++ b/grub-core/net/net.c
@@ -2073,7 +2073,7 @@ grub_net_search_config_file (char *config)
   /* Remove the remaining minus sign at the end. */
   config[config_len] = '\0';
 
-  return GRUB_ERR_NONE;
+  return GRUB_ERR_FILE_NOT_FOUND;
 }
 
 static struct grub_preboot *fini_hnd;
diff --git a/grub-core/normal/main.c b/grub-core/normal/main.c
index dfdfd56e06..58d3dcee8d 100644
--- a/grub-core/normal/main.c
+++ b/grub-core/normal/main.c
@@ -310,76 +310,79 @@ grub_enter_normal_mode (const char *config)
   grub_boot_time ("Exiting normal mode");
 }
 
+static grub_err_t
+grub_try_normal (const char *variable)
+{
+    char *config;
+    const char *prefix;
+    grub_err_t err = GRUB_ERR_FILE_NOT_FOUND;
+    const char *net_search_cfg;
+    int disable_net_search = 0;
+
+    prefix = grub_env_get (variable);
+    if (!prefix)
+      return GRUB_ERR_FILE_NOT_FOUND;
+
+    net_search_cfg = grub_env_get ("feature_net_search_cfg");
+    if (net_search_cfg && net_search_cfg[0] == 'n')
+      disable_net_search = 1;
+
+    if (grub_strncmp (prefix + 1, "tftp", sizeof ("tftp") - 1) == 0 &&
+        !disable_net_search)
+      {
+       grub_size_t config_len;
+       config_len = grub_strlen (prefix) +
+         sizeof ("/grub.cfg-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX");
+       config = grub_malloc (config_len);
+
+       if (! config)
+         return GRUB_ERR_FILE_NOT_FOUND;
+
+       grub_snprintf (config, config_len, "%s/grub.cfg", prefix);
+       err = grub_net_search_config_file (config);
+      }
+
+    if (err != GRUB_ERR_NONE)
+      {
+       config = grub_xasprintf ("%s/grub.cfg", prefix);
+       if (config)
+         {
+           grub_file_t file;
+           file = grub_file_open (config, GRUB_FILE_TYPE_CONFIG);
+           if (file)
+             {
+               grub_file_close (file);
+               err = GRUB_ERR_NONE;
+             }
+         }
+      }
+
+    if (err == GRUB_ERR_NONE)
+      grub_enter_normal_mode (config);
+
+    grub_errno = 0;
+    grub_free (config);
+    return err;
+}
+
 /* Enter normal mode from rescue mode.  */
 static grub_err_t
 grub_cmd_normal (struct grub_command *cmd __attribute__ ((unused)),
                 int argc, char *argv[])
 {
-  if (argc == 0)
-    {
-      /* Guess the config filename. It is necessary to make CONFIG static,
-        so that it won't get broken by longjmp.  */
-      char *config;
-      const char *prefix, *fw_path;
-
-      prefix = fw_path = grub_env_get ("fw_path");
-      if (fw_path)
-       {
-         config = grub_xasprintf ("%s/grub.cfg", fw_path);
-         if (config)
-           {
-             grub_file_t file;
-
-             file = grub_file_open (config, GRUB_FILE_TYPE_CONFIG);
-             if (file)
-               {
-                 grub_file_close (file);
-                 grub_enter_normal_mode (config);
-               }
-              else
-                {
-                  /* Ignore all errors.  */
-                  grub_errno = 0;
-                }
-             grub_free (config);
-           }
-       }
-
-      if (!prefix)
-        prefix = grub_env_get ("prefix");
-      if (prefix)
-        {
-          grub_size_t config_len;
-          int disable_net_search = 0;
-          const char *net_search_cfg;
-
-          config_len = grub_strlen (prefix) +
-                       sizeof 
("/grub.cfg-XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX");
-          config = grub_malloc (config_len);
-
-          if (!config)
-            goto quit;
-
-          grub_snprintf (config, config_len, "%s/grub.cfg", prefix);
-
-          net_search_cfg = grub_env_get ("feature_net_search_cfg");
-          if (net_search_cfg && net_search_cfg[0] == 'n')
-            disable_net_search = 1;
-
-          if (grub_strncmp (prefix + 1, "tftp", sizeof ("tftp") - 1) == 0 &&
-              !disable_net_search)
-            grub_net_search_config_file (config);
-
-         grub_enter_normal_mode (config);
-         grub_free (config);
-       }
-      else
-       grub_enter_normal_mode (0);
-    }
-  else
+  if (argc)
     grub_enter_normal_mode (argv[0]);
+  else
+    {
+      /* Guess the config filename. */
+      grub_err_t err;
+      err = grub_try_normal ("fw_path");
+      if (err == GRUB_ERR_FILE_NOT_FOUND)
+        err = grub_try_normal ("prefix");
+      if (err == GRUB_ERR_FILE_NOT_FOUND)
+        grub_enter_normal_mode (0);
+    }
 
-quit:
   return 0;
 }
 
-- 
2.40.0