test: skip ipv6 tests when ipv6 is not supported

To verify on Linux, run `sudo sysctl net.ipv6.conf.all.disable_ipv6=1`
before the test suite.

Fixes: https://github.com/libuv/libuv/issues/10
PR-URL: https://github.com/libuv/libuv/pull/92
Reviewed-By: Saúl Ibarra Corretgé <saghul@gmail.com>

test/task.h

@@ -234,4 +234,21 @@ UNUSED static void close_loop(uv_loop_t* loop) {
   uv_run(loop, UV_RUN_DEFAULT);
 }
 
+UNUSED static int can_ipv6(void) {
+  uv_interface_address_t* addr;
+  int supported;
+  int count;
+  int i;
+
+  if (uv_interface_addresses(&addr, &count))
+    return 1;  /* Assume IPv6 support on failure. */
+
+  supported = 0;
+  for (i = 0; supported == 0 && i < count; i += 1)
+    supported = (AF_INET6 == addr[i].address.address6.sin6_family);
+
+  uv_free_interface_addresses(addr, count);
+  return supported;
+}
+
 #endif /* TASK_H_ */

test/test-ping-pong.c

@@ -246,6 +246,9 @@ TEST_IMPL(tcp_ping_pong) {
 
 
 TEST_IMPL(tcp_ping_pong_v6) {
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
   tcp_pinger_v6_new();
   uv_run(uv_default_loop(), UV_RUN_DEFAULT);
 

test/test-tcp-bind6-error.c

@@ -39,6 +39,9 @@ TEST_IMPL(tcp_bind6_error_addrinuse) {
   uv_tcp_t server1, server2;
   int r;
 
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
   ASSERT(0 == uv_ip6_addr("::", TEST_PORT, &addr));
 
   r = uv_tcp_init(uv_default_loop(), &server1);
@@ -73,6 +76,9 @@ TEST_IMPL(tcp_bind6_error_addrnotavail) {
   uv_tcp_t server;
   int r;
 
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
   ASSERT(0 == uv_ip6_addr("4:4:4:4:4:4:4:4", TEST_PORT, &addr));
 
   r = uv_tcp_init(uv_default_loop(), &server);
@@ -98,6 +104,9 @@ TEST_IMPL(tcp_bind6_error_fault) {
   uv_tcp_t server;
   int r;
 
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
   garbage_addr = (struct sockaddr_in6*) &garbage;
 
   r = uv_tcp_init(uv_default_loop(), &server);
@@ -123,6 +132,9 @@ TEST_IMPL(tcp_bind6_error_inval) {
   uv_tcp_t server;
   int r;
 
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
   ASSERT(0 == uv_ip6_addr("::", TEST_PORT, &addr1));
   ASSERT(0 == uv_ip6_addr("::", TEST_PORT_2, &addr2));
 
@@ -149,6 +161,9 @@ TEST_IMPL(tcp_bind6_localhost_ok) {
   uv_tcp_t server;
   int r;
 
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
   ASSERT(0 == uv_ip6_addr("::1", TEST_PORT, &addr));
 
   r = uv_tcp_init(uv_default_loop(), &server);

test/test-udp-ipv6.c

@@ -147,23 +147,22 @@ static void do_test(uv_udp_recv_cb recv_cb, int bind_flags) {
 
 
 TEST_IMPL(udp_dual_stack) {
-#if defined(__DragonFly__)  || \
+  if (!can_ipv6())
-    defined(__FreeBSD__)    || \
+    RETURN_SKIP("IPv6 not supported");
-    defined(__OpenBSD__)    || \
+
-    defined(__NetBSD__)
-  RETURN_SKIP("dual stack not enabled by default in this OS.");
-#else
   do_test(ipv6_recv_ok, 0);
 
   ASSERT(recv_cb_called == 1);
   ASSERT(send_cb_called == 1);
 
   return 0;
-#endif
 }
 
 
 TEST_IMPL(udp_ipv6_only) {
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
   do_test(ipv6_recv_fail, UV_UDP_IPV6ONLY);
 
   ASSERT(recv_cb_called == 0);

test/test-udp-multicast-interface6.c

@@ -60,6 +60,9 @@ TEST_IMPL(udp_multicast_interface6) {
   struct sockaddr_in6 addr;
   struct sockaddr_in6 baddr;
 
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
   ASSERT(0 == uv_ip6_addr("::1", TEST_PORT, &addr));
 
   r = uv_udp_init(uv_default_loop(), &server);

test/test-udp-multicast-join6.c

@@ -103,6 +103,9 @@ TEST_IMPL(udp_multicast_join6) {
   uv_buf_t buf;
   struct sockaddr_in6 addr;
 
+  if (!can_ipv6())
+    RETURN_SKIP("IPv6 not supported");
+
   ASSERT(0 == uv_ip6_addr("::1", TEST_PORT, &addr));
 
   r = uv_udp_init(uv_default_loop(), &server);