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https://github.com/libuv/libuv/issues/4211
https://github.com/libuv/libuv/pull/4220
https://github.com/libuv/libuv/commit/54d8364c2406758b572621af381f1d83e01ae46c
From 54d8364c2406758b572621af381f1d83e01ae46c Mon Sep 17 00:00:00 2001
From: Ben Noordhuis <info@bnoordhuis.nl>
Date: Tue, 14 Nov 2023 22:09:30 +0100
Subject: [PATCH] test: check if ipv6 link-local traffic is routable (#4220)
Fixes: https://github.com/libuv/libuv/issues/4211
--- a/test/test-tcp-connect6-error.c
+++ b/test/test-tcp-connect6-error.c
@@ -23,6 +23,7 @@
#include "task.h"
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
static int connect_cb_called = 0;
@@ -75,9 +76,13 @@ TEST_IMPL(tcp_connect6_error_fault) {
TEST_IMPL(tcp_connect6_link_local) {
+ uv_interface_address_t* ifs;
+ uv_interface_address_t* p;
struct sockaddr_in6 addr;
uv_connect_t req;
uv_tcp_t server;
+ int ok;
+ int n;
if (!can_ipv6())
RETURN_SKIP("IPv6 not supported");
@@ -90,6 +95,18 @@ TEST_IMPL(tcp_connect6_link_local) {
RETURN_SKIP("Test does not currently work in QEMU");
#endif /* defined(__QEMU__) */
+ /* Check there's an interface that routes link-local (fe80::/10) traffic. */
+ ASSERT_OK(uv_interface_addresses(&ifs, &n));
+ for (p = ifs; p < &ifs[n]; p++)
+ if (p->address.address6.sin6_family == AF_INET6)
+ if (!memcmp(&p->address.address6.sin6_addr, "\xfe\x80", 2))
+ break;
+ ok = (p < &ifs[n]);
+ uv_free_interface_addresses(ifs, n);
+
+ if (!ok)
+ RETURN_SKIP("IPv6 link-local traffic not supported");
+
ASSERT_OK(uv_ip6_addr("fe80::0bad:babe", 1337, &addr));
ASSERT_OK(uv_tcp_init(uv_default_loop(), &server));
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