unix-fd: add basic marshalling code for unix fds

This is actually pretty boring since we store our fds as indexes that
are stored as uint32_t's.

dbus/dbus-marshal-basic.c

@@ -414,6 +414,7 @@ _dbus_marshal_set_basic (DBusString       *str,
     case DBUS_TYPE_BOOLEAN:
     case DBUS_TYPE_INT32:
     case DBUS_TYPE_UINT32:
+    case DBUS_TYPE_UNIX_FD:
       pos = _DBUS_ALIGN_VALUE (pos, 4);
       set_4_octets (str, pos, vp->u32, byte_order);
       if (old_end_pos)
@@ -540,6 +541,7 @@ _dbus_marshal_read_basic (const DBusString      *str,
     case DBUS_TYPE_INT32:
     case DBUS_TYPE_UINT32:
     case DBUS_TYPE_BOOLEAN:
+    case DBUS_TYPE_UNIX_FD:
       {
       volatile dbus_uint32_t *vp = value;
       pos = _DBUS_ALIGN_VALUE (pos, 4);
@@ -839,6 +841,7 @@ _dbus_marshal_write_basic (DBusString *str,
       break;
     case DBUS_TYPE_INT32:
     case DBUS_TYPE_UINT32:
+    case DBUS_TYPE_UNIX_FD:
       return marshal_4_octets (str, insert_at, vp->u32,
                                byte_order, pos_after);
       break;
@@ -1066,6 +1069,7 @@ _dbus_marshal_write_fixed_multi (DBusString *str,
     case DBUS_TYPE_BOOLEAN:
     case DBUS_TYPE_INT32:
     case DBUS_TYPE_UINT32:
+    case DBUS_TYPE_UNIX_FD:
       return marshal_fixed_multi (str, insert_at, vp, n_elements, byte_order, 4, pos_after);
       break;
     case DBUS_TYPE_INT64:
@@ -1114,6 +1118,7 @@ _dbus_marshal_skip_basic (const DBusString      *str,
     case DBUS_TYPE_BOOLEAN:
     case DBUS_TYPE_INT32:
     case DBUS_TYPE_UINT32:
+    case DBUS_TYPE_UNIX_FD:
       *pos = _DBUS_ALIGN_VALUE (*pos, 4);
       *pos += 4;
       break;
@@ -1202,6 +1207,7 @@ _dbus_type_get_alignment (int typecode)
     case DBUS_TYPE_BOOLEAN:
     case DBUS_TYPE_INT32:
     case DBUS_TYPE_UINT32:
+    case DBUS_TYPE_UNIX_FD:
       /* this stuff is 4 since it starts with a length */
     case DBUS_TYPE_STRING:
     case DBUS_TYPE_OBJECT_PATH:
@@ -1256,6 +1262,7 @@ _dbus_type_is_valid (int typecode)
     case DBUS_TYPE_STRUCT:
     case DBUS_TYPE_DICT_ENTRY:
     case DBUS_TYPE_VARIANT:
+    case DBUS_TYPE_UNIX_FD:
       return TRUE;
 
     default:
@@ -1316,6 +1323,8 @@ _dbus_type_to_string (int typecode)
       return "begin_dict_entry";
     case DBUS_DICT_ENTRY_END_CHAR:
       return "end_dict_entry";
+    case DBUS_TYPE_UNIX_FD:
+      return "unix_fd";
     default:
       return "unknown";
     }

dbus/dbus-marshal-byteswap.c

@@ -191,6 +191,11 @@ byteswap_body_helper (DBusTypeReader       *reader,
           }
           break;
 
+        case DBUS_TYPE_UNIX_FD:
+          /* fds can only be passed on a local machine, so byte order must always match */
+          _dbus_assert_not_reached("attempted to byteswap unix fds which makes no sense");
+          break;
+
         default:
           _dbus_assert_not_reached ("invalid typecode in supposedly-validated signature");
           break;

dbus/dbus-marshal-header.c

@@ -81,7 +81,8 @@ _dbus_header_field_types[DBUS_HEADER_FIELD_LAST+1] = {
   { DBUS_HEADER_FIELD_REPLY_SERIAL, DBUS_TYPE_UINT32 },
   { DBUS_HEADER_FIELD_DESTINATION, DBUS_TYPE_STRING },
   { DBUS_HEADER_FIELD_SENDER, DBUS_TYPE_STRING },
-  { DBUS_HEADER_FIELD_SIGNATURE, DBUS_TYPE_SIGNATURE }
+  { DBUS_HEADER_FIELD_SIGNATURE, DBUS_TYPE_SIGNATURE },
+  { DBUS_HEADER_FIELD_UNIX_FDS, DBUS_TYPE_UINT32 }
 };
 
 /** Macro to look up the correct type for a field */
@@ -888,6 +889,10 @@ load_and_validate_field (DBusHeader     *header,
         }
       break;
 
+    case DBUS_HEADER_FIELD_UNIX_FDS:
+      /* Every value makes sense */
+      break;
+
     case DBUS_HEADER_FIELD_SIGNATURE:
       /* SIGNATURE validated generically due to its type */
       string_validation_func = NULL;

dbus/dbus-marshal-validate.c

@@ -100,6 +100,7 @@ _dbus_validate_signature_with_reason (const DBusString *type_str,
         case DBUS_TYPE_UINT16:
         case DBUS_TYPE_INT32:
         case DBUS_TYPE_UINT32:
+        case DBUS_TYPE_UNIX_FD:
         case DBUS_TYPE_INT64:
         case DBUS_TYPE_UINT64:
         case DBUS_TYPE_DOUBLE:
@@ -319,12 +320,13 @@ validate_body_helper (DBusTypeReader       *reader,
         case DBUS_TYPE_BYTE:
           ++p;
           break;
-          
+
         case DBUS_TYPE_BOOLEAN:
         case DBUS_TYPE_INT16:
         case DBUS_TYPE_UINT16:
         case DBUS_TYPE_INT32:
         case DBUS_TYPE_UINT32:
+        case DBUS_TYPE_UNIX_FD:
         case DBUS_TYPE_INT64:
         case DBUS_TYPE_UINT64:
         case DBUS_TYPE_DOUBLE:

dbus/dbus-message-factory.c

@@ -949,6 +949,7 @@ static const int typecodes[] = {
   DBUS_STRUCT_END_CHAR,
   DBUS_DICT_ENTRY_BEGIN_CHAR,
   DBUS_DICT_ENTRY_END_CHAR,
+  DBUS_TYPE_UNIX_FD,
   255 /* random invalid typecode */
 };
   

dbus/dbus-signature.c

@@ -355,6 +355,7 @@ dbus_type_is_fixed (int typecode)
     case DBUS_TYPE_INT64:
     case DBUS_TYPE_UINT64:
     case DBUS_TYPE_DOUBLE:
+    case DBUS_TYPE_UNIX_FD:
       return TRUE;
     default:
       return FALSE;