1 files changed, 39 insertions, 0 deletions
diff --git a/rfc1035/rfc1035mksocket.c b/rfc1035/rfc1035mksocket.c
new file mode 100644
index 0000000..45bb66a
--- /dev/null
+++ b/rfc1035/rfc1035mksocket.c
@@ -0,0 +1,39 @@
+/*
+** Copyright 1998 - 2011 Double Precision, Inc.
+** See COPYING for distribution information.
+*/
+#include	"config.h"
+#include	"rfc1035.h"
+#include	<sys/types.h>
+#include	<sys/socket.h>
+#include	<arpa/inet.h>
+#include	<errno.h>
+
+
+/*
+**	Create a socket.  Duh.  If we've compiled IPv6 support, but we can't
+**	create an IPv6 socket, create an IPv4 socket.  This can happen, say,
+**	on Linux with IPv6 runtime libraries, but without IPv6 in the kernel.
+*/
+
+int	rfc1035_mksocket(int sock_type, int sock_protocol, int *af)
+{
+#if	RFC1035_IPV6
+	int	s;
+	int	on=0;
+
+	*af=AF_INET6;
+	if ( (s=socket(PF_INET6, sock_type, sock_protocol)) >= 0)
+	{
+#ifdef IPV6_V6ONLY
+
+		setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY,
+			   (char *)&on, sizeof(on));
+#endif
+
+		return (s);
+	}
+#endif
+	*af=AF_INET;
+	return (socket(PF_INET, sock_type, sock_protocol));
+}