fixes #262 NNG_OPT_URL should be resolved

This causes TCP, TLS, and ZT endpoints to resolve any
wildcards, and even IP addresses, when reporting the listen
URL.  The dialer URL is reported unresolved.  Test cases
for this are added as well, and nngcat actually reports this
if --verbose is supplied.

3 files changed, 56 insertions, 1 deletions

diff --git a/tests/tcp.c b/tests/tcp.c
index ef572c9d..42be028d 100644
--- a/tests/tcp.c
+++ b/tests/tcp.c
@@ -80,6 +80,25 @@ TestMain("TCP Transport", {
 		So(nng_dial(s2, addr, NULL, 0) == 0);
 	});
 
+	Convey("We can bind to port zero", {
+		nng_socket   s1;
+		nng_socket   s2;
+		nng_listener l;
+		char         addr[NNG_MAXADDRLEN];
+		size_t       sz;
+
+		So(nng_pair_open(&s1) == 0);
+		So(nng_pair_open(&s2) == 0);
+		Reset({
+			nng_close(s2);
+			nng_close(s1);
+		});
+		So(nng_listen(s1, "tcp://127.0.0.1:0", &l, 0) == 0);
+		sz = NNG_MAXADDRLEN;
+		So(nng_listener_getopt(l, NNG_OPT_URL, addr, &sz) == 0);
+		So(nng_dial(s2, addr, NULL, 0) == 0);
+	});
+
 	Convey("Malformed TCP addresses do not panic", {
 		nng_socket s1;
 
diff --git a/tests/tls.c b/tests/tls.c
index 31041fa5..f51fabef 100644
--- a/tests/tls.c
+++ b/tests/tls.c
@@ -9,7 +9,9 @@
 //
 
 #include "convey.h"
+
 #include "nng.h"
+
 #include "protocol/pair1/pair.h"
 #include "supplemental/tls/tls.h"
 #include "transport/tls/tls.h"
@@ -293,6 +295,26 @@ TestMain("TLS Transport", {
 		So(nng_dial(s2, addr, NULL, 0) == 0);
 	});
 
+	Convey("We can bind to port zero", {
+		nng_socket   s1;
+		nng_socket   s2;
+		nng_listener l;
+		char         addr[NNG_MAXADDRLEN];
+		size_t       sz;
+
+		So(nng_tls_register() == 0);
+		So(nng_pair_open(&s1) == 0);
+		So(nng_pair_open(&s2) == 0);
+		Reset({
+			nng_close(s2);
+			nng_close(s1);
+		});
+		So(nng_listen(s1, "tls+tcp://127.0.0.1:0", &l, 0) == 0);
+		sz = NNG_MAXADDRLEN;
+		So(nng_listener_getopt(l, NNG_OPT_URL, addr, &sz) == 0);
+		So(nng_dial(s2, addr, NULL, 0) == 0);
+	});
+
 	Convey("Malformed TLS addresses do not panic", {
 		nng_socket s1;
 
diff --git a/tests/zt.c b/tests/zt.c
index c8b7563c..fa662857 100644
--- a/tests/zt.c
+++ b/tests/zt.c
@@ -285,6 +285,20 @@ TestMain("ZeroTier Transport", {
 		nng_msleep(2000); // to give dialer time to start up
 	});
 
-	trantest_test_extended("zt://*." NWID ":%u", check_props);
+	// We need to determine our ephemeral ID:
+
+	nng_socket   s_test;
+	nng_listener l_test;
+	uint64_t     node;
+	char         fmt[128];
+
+	So(nng_pair_open(&s_test) == 0);
+	So(nng_listener_create(&l_test, s_test, "zt://*." NWID ":0") == 0);
+	So(nng_listener_start(l_test, 0) == 0);
+	So(nng_listener_getopt_uint64(l_test, NNG_OPT_ZT_NODE, &node) == 0);
+	snprintf(fmt, sizeof(fmt), "zt://%llx." NWID ":%%u", node);
+	nng_listener_close(l_test);
+
+	trantest_test_extended(fmt, check_props);
 
 })