1 files changed, 113 insertions, 0 deletions
diff --git a/lib/isc/win32/win32os.c b/lib/isc/win32/win32os.c
new file mode 100644
index 0000000..4f86d38
--- /dev/null
+++ b/lib/isc/win32/win32os.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0.  If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <windows.h>
+
+#ifndef TESTVERSION
+#include <isc/win32os.h>
+#else /* ifndef TESTVERSION */
+#include <stdio.h>
+
+#include <isc/util.h>
+#endif /* ifndef TESTVERSION */
+#include <isc/print.h>
+
+int
+isc_win32os_versioncheck(unsigned int major, unsigned int minor,
+			 unsigned int spmajor, unsigned int spminor) {
+	OSVERSIONINFOEX osVer;
+	DWORD typeMask;
+	ULONGLONG conditionMask;
+
+	memset(&osVer, 0, sizeof(OSVERSIONINFOEX));
+	osVer.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);
+	typeMask = 0;
+	conditionMask = 0;
+
+	/* Optimistic: likely greater */
+	osVer.dwMajorVersion = major;
+	typeMask |= VER_MAJORVERSION;
+	conditionMask = VerSetConditionMask(conditionMask, VER_MAJORVERSION,
+					    VER_GREATER);
+	osVer.dwMinorVersion = minor;
+	typeMask |= VER_MINORVERSION;
+	conditionMask = VerSetConditionMask(conditionMask, VER_MINORVERSION,
+					    VER_GREATER);
+	osVer.wServicePackMajor = spmajor;
+	typeMask |= VER_SERVICEPACKMAJOR;
+	conditionMask = VerSetConditionMask(conditionMask, VER_SERVICEPACKMAJOR,
+					    VER_GREATER);
+	osVer.wServicePackMinor = spminor;
+	typeMask |= VER_SERVICEPACKMINOR;
+	conditionMask = VerSetConditionMask(conditionMask, VER_SERVICEPACKMINOR,
+					    VER_GREATER);
+	if (VerifyVersionInfo(&osVer, typeMask, conditionMask)) {
+		return (1);
+	}
+
+	/* Failed: retry with equal */
+	conditionMask = 0;
+	conditionMask = VerSetConditionMask(conditionMask, VER_MAJORVERSION,
+					    VER_EQUAL);
+	conditionMask = VerSetConditionMask(conditionMask, VER_MINORVERSION,
+					    VER_EQUAL);
+	conditionMask = VerSetConditionMask(conditionMask, VER_SERVICEPACKMAJOR,
+					    VER_EQUAL);
+	conditionMask = VerSetConditionMask(conditionMask, VER_SERVICEPACKMINOR,
+					    VER_EQUAL);
+	if (VerifyVersionInfo(&osVer, typeMask, conditionMask)) {
+		return (0);
+	} else {
+		return (-1);
+	}
+}
+
+#ifdef TESTVERSION
+int
+main(int argc, char **argv) {
+	unsigned int major = 0;
+	unsigned int minor = 0;
+	unsigned int spmajor = 0;
+	unsigned int spminor = 0;
+	int ret;
+
+	if (argc > 1) {
+		--argc;
+		++argv;
+		major = (unsigned int)atoi(argv[0]);
+	}
+	if (argc > 1) {
+		--argc;
+		++argv;
+		minor = (unsigned int)atoi(argv[0]);
+	}
+	if (argc > 1) {
+		--argc;
+		++argv;
+		spmajor = (unsigned int)atoi(argv[0]);
+	}
+	if (argc > 1) {
+		--argc;
+		POST(argc);
+		++argv;
+		spminor = (unsigned int)atoi(argv[0]);
+	}
+
+	ret = isc_win32os_versioncheck(major, minor, spmajor, spminor);
+
+	printf("%s major %u minor %u SP major %u SP minor %u\n",
+	       ret > 0 ? "greater" : (ret == 0 ? "equal" : "less"), major,
+	       minor, spmajor, spminor);
+	return (ret);
+}
+#endif /* ifdef TESTVERSION */