From 0e610292315da12a1e5ed5108377e5d000dda813 Mon Sep 17 00:00:00 2001
From: Evgeny <me@jeka.su>
Date: Sun, 8 Mar 2026 19:55:59 +0300
Subject: [PATCH] 1

---
 configure.ac      | 14 --------------
 src/Makefile.am   |  8 +++++---
 src/tun_freebsd.c |  4 ++++
 src/tun_linux.c   |  4 ++++
 src/tun_windows.c |  5 +++++
 5 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/configure.ac b/configure.ac
index 278a9a0..14653c3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -81,20 +81,6 @@ AC_MSG_RESULT([$os_freebsd])
 
 AM_CONDITIONAL([OS_FREEBSD], [test "x$os_freebsd" = "xyes"])
 
-# Set TUN source file based on platform
-if test "x$os_freebsd" = "xyes"; then
-    TUN_SOURCE="tun_freebsd.c"
-    TUN_LIBS=""
-elif test "x$os_windows" = "xyes"; then
-    TUN_SOURCE="tun_windows.c"
-    TUN_LIBS="-liphlpapi -lws2_32 -ladvapi32 -lbcrypt -ldbghelp"
-else
-    TUN_SOURCE="tun_linux.c"
-    TUN_LIBS=""
-fi
-AC_SUBST([TUN_SOURCE])
-AC_SUBST([TUN_LIBS])
-
 # Checks for header files, typedefs, functions...
 AC_CHECK_HEADERS([arpa/inet.h fcntl.h limits.h netinet/in.h stdlib.h string.h sys/ioctl.h sys/socket.h unistd.h])
 AC_TYPE_SIZE_T
diff --git a/src/Makefile.am b/src/Makefile.am
index 9803480..0c1b33a 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -11,6 +11,9 @@ utun_CORE_SOURCES = \
 	routing.c \
 	tun_if.c \
 	tun_route.c \
+	tun_linux.c \
+	tun_freebsd.c \
+	tun_windows.c \
 	etcp.c \
 	etcp_connections.c \
 	etcp_loadbalancer.c \
@@ -22,9 +25,8 @@ utun_CORE_SOURCES = \
 	etcp_api.c \
 	control_server.c
 
-# Platform-specific TUN sources
-utun_TUN_SOURCES = $(TUN_SOURCE)
-utun_TUN_LIBS = $(TUN_LIBS)
+# Platform-specific TUN libs (Windows only)
+utun_TUN_LIBS = -liphlpapi -lws2_32 -ladvapi32 -lbcrypt -ldbghelp
 
 # TinyCrypt sources (only used without OpenSSL)
 utun_TINYCRYPT_SOURCES = \
diff --git a/src/tun_freebsd.c b/src/tun_freebsd.c
index b2a400c..c9e515b 100644
--- a/src/tun_freebsd.c
+++ b/src/tun_freebsd.c
@@ -1,6 +1,8 @@
 // tun_freebsd.c - FreeBSD TUN/TAP implementation
 // Uses /dev/tun device with ioctl
 
+#if defined(__FreeBSD__)
+
 #include "tun_if.h"
 #include "../lib/debug_config.h"
 #include <stdio.h>
@@ -235,3 +237,5 @@ ssize_t tun_platform_write(struct tun_if* tun, const uint8_t* buf, size_t len) {
 int tun_platform_get_poll_fd(struct tun_if* tun) {
     return tun->fd;
 }
+
+#endif // __FreeBSD__
diff --git a/src/tun_linux.c b/src/tun_linux.c
index 3c9bbff..581e7da 100644
--- a/src/tun_linux.c
+++ b/src/tun_linux.c
@@ -1,6 +1,8 @@
 // tun_linux.c - Linux TUN/TAP implementation
 // Uses /dev/net/tun device with ioctl
 
+#if defined(__linux__)
+
 #include "tun_if.h"
 #include "../lib/debug_config.h"
 #include <stdio.h>
@@ -237,3 +239,5 @@ ssize_t tun_platform_write(struct tun_if* tun, const uint8_t* buf, size_t len) {
 int tun_platform_get_poll_fd(struct tun_if* tun) {
     return tun->fd;
 }
+
+#endif // __linux__
diff --git a/src/tun_windows.c b/src/tun_windows.c
index 714ad0b..f1dfb8f 100644
--- a/src/tun_windows.c
+++ b/src/tun_windows.c
@@ -1,4 +1,7 @@
 // tun_windows.c - Wintun implementation
+
+#if defined(_WIN32)
+
 #include "../lib/debug_config.h"
 #include "../lib/u_async.h"
 #include "tun_if.h"
@@ -307,3 +310,5 @@ DWORD WINAPI tun_read_thread_proc(LPVOID arg)
     DEBUG_DEBUG(DEBUG_CATEGORY_TUN, "TUN exit");
     return 0;
 }
+
+#endif // _WIN32