1 files changed, 14 insertions, 0 deletions
diff --git a/cgi/4or6.c b/cgi/4or6.c
new file mode 100644
index 0000000..1cf6780
--- /dev/null
+++ b/cgi/4or6.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+int main()
+{
+	printf("Content-type: text/plain\n\n");
+	if(!getenv("REMOTE_ADDR"))return 0;
+	char* s=getenv("REMOTE_ADDR");
+	if(getenv("HTTP_X_FORWARDED_FOR"))
+	s=getenv("HTTP_X_FORWARDED_FOR");
+	if(strchr(s,':')!=NULL)puts("6");
+	else puts("4");
+	return 0;
+}