src/server/server.c

@@ -458,7 +458,7 @@ void handler(int file_descriptor) {
    * device-node creation) sees SUPER_MODE_OFF.  The gate never mutated the
    * received config. */
   if (gate_ctx.super_mode_override != -1)
-    config->super_mode = gate_ctx.super_mode_override;
+    config->super_mode = (SuperMode)gate_ctx.super_mode_override;
   protocol_set_8_bit_output(config->eight_bit_output);
   if (!authorized_root) {
     log_message(LOG_LEVEL_ERROR, "No server-side destination root configured");

src/shared/config.c

@@ -1293,14 +1293,14 @@ static bool receive_iconv_spec(int fd, Config* c) {
  * validated to the SUPER_MODE_AUTO..SUPER_MODE_OFF range (also re-checked by
  * validate_received_config). */
 static bool send_privilege_options(int fd, const Config* c) {
-  return send_int(fd, c->super_mode);
+  return send_int(fd, (int)c->super_mode);
 }
 
 static bool receive_privilege_options(int fd, Config* c) {
   int mode;
   if (!receive_int(fd, &mode) || mode < SUPER_MODE_AUTO || mode > SUPER_MODE_OFF)
     return false;
-  c->super_mode = mode;
+  c->super_mode = (SuperMode)mode;
   return true;
 }
 

src/shared/config.h

@@ -68,6 +68,13 @@ typedef struct {
   int value;    /* 0/1 for booleans, byte count for SO_RCVBUF/SO_SNDBUF */
 } SockOptEntry;
 
+/* --super / --no-super tri-state (Config->super_mode).  AUTO (default) and ON
+ * both permit a confined super-user attempt (AUTO preserves FastSync's
+ * historical best-effort behavior; an unprivileged attempt is refused by the
+ * kernel and skipped per entry); OFF forbids the attempt even for root.  See
+ * privilege_super_mode_permitted() in identity.h. */
+typedef enum SuperMode { SUPER_MODE_AUTO = 0, SUPER_MODE_ON = 1, SUPER_MODE_OFF = 2 } SuperMode;
+
 typedef struct Config {
   char* version;
   char* send_directory;
@@ -416,7 +423,7 @@ typedef struct Config {
    * as a trailing int so the receiver can enforce the policy.  See
    * privilege_super_permitted() and identity_ownership_requested() in
    * identity.h. */
-  int super_mode;
+  SuperMode super_mode;
 
   // Receiver-side runtime staging registry for --delay-updates.  Never sent
   // over the wire and never set on the sender side.
@@ -644,15 +651,6 @@ typedef struct Config {
 #define IDENTITY_CURRENT (-1)
 #define MAX_IDENTITY_MAP 128
 
-/* --super / --no-super tri-state (Config->super_mode).  AUTO (default) and ON
- * both permit a confined super-user attempt (AUTO preserves FastSync's
- * historical best-effort behavior; an unprivileged attempt is refused by the
- * kernel and skipped per entry); OFF forbids the attempt even for root.  See
- * privilege_super_mode_permitted() in identity.h. */
-#define SUPER_MODE_AUTO 0
-#define SUPER_MODE_ON 1
-#define SUPER_MODE_OFF 2
-
 Config* config_create(void);
 void config_delete(Config* config);
 

src/shared/identity.c

@@ -30,7 +30,7 @@ typedef struct {
   /* --super / --no-super tri-state (SUPER_MODE_AUTO when unset).  Snapshotted
    * per connection so privilege_super_permitted() can gate super-user
    * activities without a Config argument. */
-  int super_mode;
+  SuperMode super_mode;
   /* --copy-as=USER[:GROUP]: snapshotted so the ownership resolver can force the
    * target ids without a Config argument. */
   bool copy_as_set;
@@ -128,7 +128,7 @@ bool privilege_super_permitted(void) {
   return privilege_super_mode_permitted(g_identity.super_mode);
 }
 
-bool privilege_super_mode_permitted(int mode) {
+bool privilege_super_mode_permitted(SuperMode mode) {
   /* AUTO and ON both attempt the confined operation; OFF forbids it even for a
    * root receiver.  AUTO is the historical FastSync behavior (always attempt
    * and let the kernel refuse an unprivileged call, which the caller skips), so

src/shared/identity.h

@@ -128,6 +128,6 @@ bool identity_wire_valid(const Config* config);
  * best-effort behavior where an unprivileged attempt is refused by the kernel
  * and skipped.  Neither EVER elevates privileges. */
 bool privilege_super_permitted(void);
-bool privilege_super_mode_permitted(int mode);
+bool privilege_super_mode_permitted(SuperMode mode);
 
 #endif

tests/test_config.c

@@ -1672,7 +1672,7 @@ static void test_config_receive_rejects_invalid_iconv_spec() {
 static void test_config_super_mode_wire_roundtrip() {
   if (is_running_under_valgrind())
     return;
-  int modes[] = {SUPER_MODE_AUTO, SUPER_MODE_ON, SUPER_MODE_OFF};
+  SuperMode modes[] = {SUPER_MODE_AUTO, SUPER_MODE_ON, SUPER_MODE_OFF};
   for (size_t i = 0; i < sizeof(modes) / sizeof(modes[0]); i++) {
     int p[2];
     EXPECT_EQ_INT(socketpair(AF_UNIX, SOCK_STREAM, 0, p), 0);