Add randomized ETCP padding and isolate STCP CTR streams per connection

tests/Makefile.am

@@ -130,7 +130,7 @@ check_PROGRAMS = \
 # Linux-only: test_auto_socket_dynamic требует root + dummy-интерфейсы + iproute2/netlink.
 if OS_LINUX
 check_PROGRAMS += test_auto_socket_dynamic test_standby test_standby_transport test_group_connect_standby test_android_udp_log test_pool_corruption_log
-check_PROGRAMS += test_uasync_regressions test_ll_queue_regressions
+check_PROGRAMS += test_uasync_regressions test_ll_queue_regressions test_etcp_padding
 endif
 
 # Silero VAD: только при включённом ONNX Runtime (--with-silero-vad)
@@ -164,6 +164,7 @@ COMMON_LIBS = $(top_builddir)/lib/libuasync.a $(CRYPTO_LIBS) -lpthread $(WIN_LIB
 
 # Вариант общего ядра с Android duty-cycle, без JNI и устройства.
 if OS_LINUX
+test_stcp_LDFLAGS = -Wl,--wrap=send -Wl,--wrap=random_bytes
 standby_test_sources = ../tools/chatgui-android/libutun_lite/standby.c ../src/utun_instance.c ../src/transport_layer/etcp_keepalive.c
 standby_test_cppflags = $(AM_CPPFLAGS) -I$(top_srcdir)/src/chat -I$(top_srcdir)/tools/chatgui-android/libutun_lite -DUTUN_HAVE_STANDBY
 test_standby_SOURCES = ../tools/chatgui-android/libutun_lite/tests/test_standby.c $(standby_test_sources)
@@ -186,6 +187,9 @@ test_pool_corruption_log_LDADD = $(COMMON_LIBS)
 async_regression_sources = async_regression.c async_regression.h
 async_regression_ldflags = -Wl,--wrap=u_malloc_impl -Wl,--wrap=u_calloc_impl -Wl,--wrap=u_realloc_impl \
     -Wl,--wrap=gettimeofday -Wl,--wrap=epoll_wait -Wl,--wrap=epoll_ctl -Wl,--wrap=eventfd -Wl,--wrap=epoll_create1
+test_etcp_padding_SOURCES = test_etcp_padding.c
+test_etcp_padding_LDADD = $(LIBUTUN) $(COMMON_LIBS)
+test_etcp_padding_LDFLAGS = -Wl,--wrap=uasync_set_timeout -Wl,--wrap=socket_sendto
 test_uasync_regressions_SOURCES = test_uasync_regressions.c $(async_regression_sources)
 test_uasync_regressions_LDADD = $(COMMON_LIBS)
 test_uasync_regressions_LDFLAGS = $(async_regression_ldflags)