Test STUN recheck with an existing and a newly discovered path

tests/Makefile.am

@@ -586,7 +586,7 @@ endif
 test_stun_nat_SOURCES = test_stun_nat.c $(test_clock_sources)
 test_stun_nat_CFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/lib
 test_stun_nat_LDADD = $(LIBUTUN) $(CRYPTO_LIBS) $(COMMON_LIBS)
-test_stun_nat_LDFLAGS = $(test_clock_ldflags)
+test_stun_nat_LDFLAGS = $(test_clock_ldflags) -Wl,--wrap=socket_create_udp
 
 test_nat_engine_SOURCES = test_nat_engine.c
 test_nat_engine_CFLAGS = -I$(top_srcdir)/src -I$(top_srcdir)/lib

tests/test_stun_nat.c

@@ -12,6 +12,10 @@
 
 #define COOKIE 0x2112a442u
 
+static unsigned udp_creations;
+extern socket_t __real_socket_create_udp(int family);
+socket_t __wrap_socket_create_udp(int family) { udp_creations++; return __real_socket_create_udp(family); }
+
 struct fixture;
 struct endpoint {
     struct fixture* fixture;
@@ -360,6 +364,28 @@ static void test_cache(void) {
     DEBUG_INFO(DEBUG_CATEGORY_NAT, "PASS STUN cache: automatic refresh, preserved age, failed refresh and expiry");
 }
 
+/* Recheck одновременно видит старый и новый путь: каждому нужен только один свежий тестовый fd. */
+static void test_recheck_new_path(void) {
+    struct fixture f = {.mapping = STUN_MAP_EIM, .multiple_clients = 1}; fixture_init(&f); fixture_start(&f, 0, 0, 0);
+    struct stun_nat_result prior = wait_result(&f), current;
+    struct ETCP_SOCKET added = extra_socket(&f, "added", "127.0.0.5");
+    f.source.next = &added;
+    unsigned before = udp_creations;
+    stun_nat_recheck(&f.inst);
+    assert(udp_creations == before + 2);
+    current = wait_result(&f);
+    assert(current.generation != prior.generation && current.evidence_id != prior.evidence_id);
+    uint64_t deadline = get_time_tb() + 3000000;
+    do {
+        assert(!stun_nat_get_socket_result(&f.inst, &added, &current));
+        if (current.status != STUN_NAT_PENDING) break;
+        test_clock_poll(f.ua, 10000);
+    } while (get_time_tb() < deadline);
+    assert(current.mapping == STUN_MAP_MATCH);
+    f.source.next = NULL; socket_close_wrapper(added.fd); fixture_destroy(&f);
+    DEBUG_INFO(DEBUG_CATEGORY_NAT, "PASS STUN recheck creates one fresh probe per existing/new path");
+}
+
 static void wait_source(struct nat_fixture* nf, struct ETCP_SOCKET* socket, uint8_t source) {
     uint64_t end = get_time_tb() + 3000000;
     while (get_time_tb() < end) {
@@ -486,6 +512,7 @@ int main(void) {
     test_config();
     test_groups();
     test_cache();
+    test_recheck_new_path();
     struct fixture ordinary = { .mapping = STUN_MAP_EIM };
     run_case("ordinary equal", &ordinary, STUN_MAP_MATCH, STUN_FILTER_UNKNOWN);
     struct fixture dependent = { .mapping = STUN_MAP_ADM };