rest: add GET /efi

Add GET /efi request to obtain information about the client's
boot entries.

Field inside the /refresh payload
'efi': {
  'entries': [
    {
      "order": 0,
      "name": "Boot0000",
      "active": false,
      "description": "grub"
    },
    {
      "order": 1,
      "name": "Boot0001",
      "active": true,
      "description": "UEFI: PXE IP4 Realtek PCIe GBE Family Controller"
    }
  ]
}

If the client is not a EFI system it won't add the 'efi' field.
If an entry is not in the boot order it won't have the 'order' field.

GET /efi resquest payload structure:
{
    'clients': ['10.141.10.21', '10.141.10.22']
}

GET /efi response's structure:
{
  'clients': [
    {
      'ip': '10.141.10.21',
      'entries': [
        {
          "order": 0,
          "name": "Boot0000",
          "active": false,
          "description": "grub"
        },
        {
          "order": 1,
          "name": "Boot0001",
          "active": true,
          "description": "UEFI: PXE IP4 Realtek PCIe GBE Family Controller"
        }
      ]
    },
    {
      'ip': '10.141.10.22',
      'entries': []
    }
  ]
}

The client with ip 10.141.10.22 is a BIOS system.

If an entry does not appear in the boot order it won't have the
'order' field.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/json.h b/src/json.h
index d3838cf..421f88d 100644
--- a/src/json.h
+++ b/src/json.h
@@ -2,6 +2,7 @@
 #define _OG_JSON_H
 
 #include <jansson.h>
+#include <stdint.h>
 #include "schedule.h"
 
 int og_json_parse_string(const json_t *element, const char **str);
@@ -146,4 +147,22 @@ struct og_cache_image {
 void og_cache_image_free(struct list_head *cache_list);
 int og_json_parse_cache(json_t *element, struct list_head *cache_list);
 
+
+#define OG_PARAM_EFI_ENTRIES        (1UL << 0)
+#define OG_PARAM_EFI_ORDER          (1UL << 1)
+#define OG_PARAM_EFI_NAME           (1UL << 2)
+#define OG_PARAM_EFI_DESCRIPTION    (1UL << 3)
+#define OG_PARAM_EFI_ACTIVE         (1UL << 4)
+
+struct og_boot_entry {
+	const char *description;
+	const char *name;
+	bool   active;
+	uint64_t order;
+	struct list_head list;
+};
+
+void og_boot_entry_free(struct list_head *boot_entry_list);
+int og_json_parse_efi(json_t *element, struct list_head *boot_entry_list);
+
 #endif