1 files changed, 45 insertions, 0 deletions
diff --git a/util-src/windows.c b/util-src/windows.c
new file mode 100644
index 00000000..7fb96312
--- /dev/null
+++ b/util-src/windows.c
@@ -0,0 +1,45 @@
+
+#include <stdio.h>
+#include <windows.h>
+#include <windns.h>
+
+#include "lua.h"
+#include "lauxlib.h"
+
+static int Lget_nameservers(lua_State *L) {
+	char stack_buffer[1024]; // stack allocated buffer
+	IP4_ARRAY* ips = (IP4_ARRAY*) stack_buffer;
+	DWORD len = sizeof(stack_buffer);
+	DNS_STATUS status;
+
+	status = DnsQueryConfig(DnsConfigDnsServerList, FALSE, NULL, NULL, ips, &len);
+	if (status == 0) {
+		DWORD i;
+		lua_createtable(L, ips->AddrCount, 0);
+		for (i = 0; i < ips->AddrCount; i++) {
+			DWORD ip = ips->AddrArray[i];
+			char ip_str[16] = "";
+			sprintf_s(ip_str, sizeof(ip_str), "%d.%d.%d.%d", (ip >> 0) & 255, (ip >> 8) & 255, (ip >> 16) & 255, (ip >> 24) & 255);
+			lua_pushstring(L, ip_str);
+			lua_rawseti(L, -2, i+1);
+		}
+		return 1;
+	} else {
+		luaL_error(L, "DnsQueryConfig returned %d", status);
+		return 0; // unreachable, but prevents a compiler warning
+	}
+}
+
+static const luaL_Reg Reg[] =
+{
+	{ "get_nameservers",	Lget_nameservers	},
+	{ NULL,		NULL	}
+};
+
+LUALIB_API int luaopen_util_windows(lua_State *L) {
+	luaL_register(L, "windows", Reg);
+	lua_pushliteral(L, "version");			/** version */
+	lua_pushliteral(L, "-3.14");
+	lua_settable(L,-3);
+	return 1;
+}