net routines

2001-07-06 05:30:51 +00:00
parent e1bdeeadb3
commit 602f0b8e48
1 changed files with 151 additions and 0 deletions
--- a/lib/isc/win32/net.c
+++ b/lib/isc/win32/net.c
@@ -0,0 +1,151 @@
+/*
+ * 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 1.2 2001/07/08 05:09:05 mayer Exp $ */
+
+#include <config.h>
+
+#include <errno.h>
+#include <unistd.h>
+
+#include <isc/log.h>
+#include <isc/msgs.h>
+#include <isc/net.h>
+#include <isc/once.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_once_t 	once = ISC_ONCE_INIT;
+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;
+
+	s = socket(domain, SOCK_STREAM, 0);
+	if (s == -1) {
+		switch (WSAGetLastError()) {
+		case WSAEAFNOSUPPORT:
+		case WSAEPROTONOSUPPORT:
+#ifdef EINVAL
+		case EINVAL:
+#endif
+			return (ISC_R_NOTFOUND);
+		default:
+			UNEXPECTED_ERROR(__FILE__, __LINE__,
+					 "socket() %s: %s",
+					 isc_msgcat_get(isc_msgcat,
+							ISC_MSGSET_GENERAL,
+							ISC_MSG_FAILED,
+							"failed"),
+					 strerror(errno));
+			return (ISC_R_UNEXPECTED);
+		}
+	}
+
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef WANT_IPV6
+#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) {
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+				      "retrieving the address of an IPv6 "
+				      "socket from the kernel failed.");
+			isc_log_write(isc_lctx, ISC_LOGCATEGORY_GENERAL,
+				      ISC_LOGMODULE_SOCKET, ISC_LOG_ERROR,
+				      "IPv6 support is disabled.");
+			result = ISC_R_NOTFOUND;
+		} else {
+			if (len == sizeof(struct sockaddr_in6))
+				result = ISC_R_SUCCESS;
+			else {
+				isc_log_write(isc_lctx,
+					      ISC_LOGCATEGORY_GENERAL,
+					      ISC_LOGMODULE_SOCKET,
+					      ISC_LOG_ERROR,
+					      "IPv6 structures in kernel and "
+					      "user space do not match.");
+				isc_log_write(isc_lctx,
+					      ISC_LOGCATEGORY_GENERAL,
+					      ISC_LOGMODULE_SOCKET,
+					      ISC_LOG_ERROR,
+					      "IPv6 support is disabled.");
+				result = ISC_R_NOTFOUND;
+			}
+		}
+	}
+#endif
+#endif
+#endif
+
+	closesocket(s);
+
+	return (result);
+}
+
+static void
+initialize_action(void) {
+	ipv4_result = try_proto(PF_INET);
+#ifdef ISC_PLATFORM_HAVEIPV6
+#ifdef WANT_IPV6
+#ifdef ISC_PLATFORM_HAVEIN6PKTINFO
+	ipv6_result = try_proto(PF_INET6);
+#endif
+#endif
+#endif
+}
+
+static void
+initialize(void) {
+	RUNTIME_CHECK(isc_once_do(&once, initialize_action) == ISC_R_SUCCESS);
+}
+
+isc_result_t
+isc_net_probeipv4(void) {
+
+	/*
+	 * Check if the system's kernel supports IPv4.
+	 */
+
+	initialize();
+	return (ipv4_result);
+}
+
+isc_result_t
+isc_net_probeipv6(void) {
+
+	/*
+	 * Check if the system's kernel supports IPv6.
+	 */
+
+	initialize();
+	return (ipv6_result);
+}