1 files changed, 123 insertions, 0 deletions
diff --git a/contrib/ntp/libisc/net.c b/contrib/ntp/libisc/net.c
new file mode 100644
index 0000000..6c51f1c
--- /dev/null
+++ b/contrib/ntp/libisc/net.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 1999-2001  Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
+ * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
+ * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+ * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/* $Id: net.c,v 1.25 2001/11/30 01:59:45 gson Exp $ */
+
+#include <config.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#include <isc/net.h>
+#include <isc/strerror.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+#if defined(ISC_PLATFORM_HAVEIPV6) && defined(ISC_PLATFORM_NEEDIN6ADDRANY)
+const struct in6_addr isc_net_in6addrany = IN6ADDR_ANY_INIT;
+#endif
+
+static isc_boolean_t 	once = ISC_FALSE;
+static isc_result_t	ipv4_result = ISC_R_NOTFOUND;
+static isc_result_t	ipv6_result = ISC_R_NOTFOUND;
+
+static isc_result_t
+try_proto(int domain) {
+	int s;
+	isc_result_t result = ISC_R_SUCCESS;
+	char strbuf[ISC_STRERRORSIZE];
+
+	s = socket(domain, SOCK_STREAM, 0);
+	if (s == -1) {
+		switch (errno) {
+#ifdef EAFNOSUPPORT
+		case EAFNOSUPPORT:
+#endif
+#ifdef EPROTONOSUPPORT
+		case EPROTONOSUPPORT:
+#endif
+#ifdef EINVAL
+		case EINVAL:
+#endif
+			return (ISC_R_NOTFOUND);
+		default:
+			isc__strerror(errno, strbuf, sizeof(strbuf));
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "socket() %s failed",
+					 strbuf);
+			return (ISC_R_UNEXPECTED);
+		}
+	}
+
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+	if (domain == PF_INET6) {
+		struct sockaddr_in6 sin6;
+		unsigned int len;
+
+		/*
+		 * Check to see if IPv6 is broken, as is common on Linux.
+		 */
+		len = sizeof(sin6);
+		if (getsockname(s, (struct sockaddr *)&sin6, (void *)&len) < 0)
+		{
+			result = ISC_R_NOTFOUND;
+		} else {
+			if (len == sizeof(struct sockaddr_in6))
+				result = ISC_R_SUCCESS;
+			else {
+				result = ISC_R_NOTFOUND;
+			}
+		}
+	}
+#endif
+#endif
+
+	(void)close(s);
+
+	return (result);
+}
+
+static void
+initialize_action(void) {
+	ipv4_result = try_proto(PF_INET);
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+	ipv6_result = try_proto(PF_INET6);
+#endif
+#endif
+}
+
+static void
+initialize(void) {
+	if(once == ISC_FALSE) {
+		initialize_action();
+		once = ISC_TRUE;
+	}
+}
+
+isc_result_t
+isc_net_probeipv4(void) {
+	initialize();
+	return (ipv4_result);
+}
+
+isc_result_t
+isc_net_probeipv6(void) {
+	initialize();
+	return (ipv6_result);
+}