MHD_USE_DUAL_STACK in libmicrohttpd currently just *inhibits setting* the
IPV6_V6ONLY socket option, but per Microsoft's documentation
http://msdn.microsoft.com/en-us/library/windows/desktop/bb513665(v=vs.85).aspx
the default on Windows is that this is enabled, thus MHD_USE_DUAL_STACK will
not work (since it leaves the default). libmicrohttpd should probably just
unconditionally set IPV6_V6ONLY to the desired value when the option is
available.
diff --git a/src/microhttpd/daemon.c b/src/microhttpd/daemon.c
index 0a33b77..3cbf28e 100644
--- a/src/microhttpd/daemon.c
+++ b/src/microhttpd/daemon.c
@@ -3493,8 +3493,7 @@ MHD_start_daemon_va (unsigned int flags,
}
daemon->socket_fd = socket_fd;
- if ( (0 != (flags & MHD_USE_IPv6)) &&
- (MHD_USE_DUAL_STACK != (flags & MHD_USE_DUAL_STACK)) )
+ if (0 != (flags & MHD_USE_IPv6))
{
#ifdef IPPROTO_IPV6
#ifdef IPV6_V6ONLY
@@ -3503,10 +3502,11 @@ MHD_start_daemon_va (unsigned int flags,
and may also be missing on older POSIX systems; good luck if you
have
any of those,
your IPv6 socket may then also bind against IPv4 anyway... */
#ifndef WINDOWS
- const int on = 1;
+ const int
#else
- const char on = 1;
+ const char
#endif
+ on = (MHD_USE_DUAL_STACK != (flags & MHD_USE_DUAL_STACK));
if ( (0 > SETSOCKOPT (socket_fd,
IPPROTO_IPV6, IPV6_V6ONLY,
&on, sizeof (on))) &&
