tun freebsd close fix

src/tun_freebsd.c

@@ -1,6 +1,7 @@
 // tun_freebsd.c - FreeBSD TUN/TAP implementation
 // Uses /dev/tun device with ioctl
 #if defined(__FreeBSD__)
+#include <sys/sockio.h>        // SIOCIFDESTROY
 #include "tun_if.h"
 #include "../lib/debug_config.h"
 #include <stdio.h>
@@ -292,9 +293,35 @@ int tun_platform_init(struct tun_if* tun, const char* ifname, const char* ip_str
 }
 // Platform-specific cleanup for FreeBSD
 void tun_platform_cleanup(struct tun_if* tun) {
+    if (!tun) return;
+
     if (tun->fd >= 0) {
         close(tun->fd);
         tun->fd = -1;
+        DEBUG_INFO(DEBUG_CATEGORY_TUN, "Closed TUN fd for %s", tun->ifname);
+    }
+
+    if (tun->ifname[0] != '\0') {
+        int sock = socket(AF_INET, SOCK_DGRAM, 0);
+        if (sock >= 0) {
+            struct ifreq ifr = {0};
+            strncpy(ifr.ifr_name, tun->ifname, IFNAMSIZ - 1);
+            ifr.ifr_name[IFNAMSIZ - 1] = '\0';
+
+            if (ioctl(sock, SIOCIFDESTROY, &ifr) < 0) {
+                // ENXIO / ENOENT = interface already gone (normal after close)
+                if (errno != ENXIO && errno != ENOENT) {
+                    DEBUG_WARN(DEBUG_CATEGORY_TUN,
+                               "SIOCIFDESTROY failed for %s: %s (errno=%d)",
+                               tun->ifname, strerror(errno), errno);
+                } else {
+                    DEBUG_DEBUG(DEBUG_CATEGORY_TUN, "TUN interface %s already destroyed", tun->ifname);
+                }
+            } else {
+                DEBUG_INFO(DEBUG_CATEGORY_TUN, "Successfully destroyed TUN interface %s", tun->ifname);
+            }
+            close(sock);
+        }
     }
 }
 // Platform-specific read for FreeBSD