tests: add some tcp dialer local address tests

src/platform/tcp_stream_test.c

@@ -1,5 +1,5 @@
 //
-// Copyright 2024 Staysail Systems, Inc. <[email protected]>
+// Copyright 2025 Staysail Systems, Inc. <[email protected]>
 // Copyright 2018 Capitar IT Group BV <[email protected]>
 //
 // This software is supplied under the terms of the MIT License, a
@@ -8,6 +8,7 @@
 // found online at https://opensource.org/licenses/MIT.
 //
 
+#include <stdio.h>
 #include <string.h>
 
 #include <nng/nng.h>
@@ -428,6 +429,48 @@ test_tcp_listen_activation_bad_arg(void)
 	nng_stream_listener_free(l1);
 }
 
+void
+test_tcp_dialer_loc_addr(void)
+{
+	nng_stream_dialer *d;
+	nng_sockaddr       sa;
+	NUTS_PASS(nng_stream_dialer_alloc(&d, "tcp://127.0.0.1:80"));
+	NUTS_PASS(nng_stream_dialer_get_addr(d, NNG_OPT_LOCADDR, &sa));
+	NUTS_TRUE(sa.s_family == NNG_AF_UNSPEC);
+
+	// cannot set a local port
+	sa.s_in.sa_family = NNG_AF_INET;
+	sa.s_in.sa_port   = 8080;
+	NUTS_FAIL(nng_stream_dialer_set_addr(d, NNG_OPT_LOCADDR, &sa),
+	    NNG_EADDRINVAL);
+
+#ifdef NNG_HAVE_INET6
+	// cannot set a local port
+	sa.s_in6.sa_family = NNG_AF_INET6;
+	sa.s_in6.sa_port   = 8080;
+	NUTS_FAIL(nng_stream_dialer_set_addr(d, NNG_OPT_LOCADDR, &sa),
+	    NNG_EADDRINVAL);
+#endif
+
+	// cannot set it to a bogus family
+	sa.s_inproc.sa_family = NNG_AF_INPROC;
+	snprintf(sa.s_inproc.sa_name, sizeof(sa.s_inproc.sa_name), "junk");
+	NUTS_FAIL(nng_stream_dialer_set_addr(d, NNG_OPT_LOCADDR, &sa),
+	    NNG_EADDRINVAL);
+
+	// bad type test
+	NUTS_FAIL(
+	    nng_stream_dialer_set_int(d, NNG_OPT_LOCADDR, 42), NNG_EBADTYPE);
+
+	// but we can set it to a legal value
+	sa.s_in.sa_family = NNG_AF_INET;
+	sa.s_in.sa_port   = 0;
+	sa.s_in.sa_addr   = nuts_be32(0x7F000001);
+	NUTS_PASS(nng_stream_dialer_set_addr(d, NNG_OPT_LOCADDR, &sa));
+
+	nng_stream_dialer_free(d);
+}
+
 NUTS_TESTS = {
 	{ "tcp stream", test_tcp_stream },
 	{ "tcp listen accept cancel", test_tcp_listen_accept_cancel },
@@ -443,5 +486,6 @@ NUTS_TESTS = {
 	    test_tcp_listen_activation_bogus_fd },
 	{ "tcp socket activation bad arg",
 	    test_tcp_listen_activation_bad_arg },
+	{ "tcp dialer local address", test_tcp_dialer_loc_addr },
 	{ NULL, NULL },
 };