1 files changed, 54 insertions, 0 deletions
diff --git a/lib/genmask.c b/lib/genmask.c
new file mode 100644
index 0000000..238e5b6
--- /dev/null
+++ b/lib/genmask.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 1993-2001 by Darren Reed.
+ *
+ * See the IPFILTER.LICENCE file for details on licencing.
+ *
+ * $Id: genmask.c,v 1.7 2003/11/11 13:40:15 darrenr Exp $
+ */
+
+#include "ipf.h"
+
+
+int genmask(msk, mskp)
+char *msk;
+u_32_t *mskp;
+{
+	char *endptr = 0L;
+	int bits;
+
+	if (strchr(msk, '.') || strchr(msk, 'x') || strchr(msk, ':')) {
+		/* possibly of the form xxx.xxx.xxx.xxx
+		 * or 0xYYYYYYYY */
+#ifdef	USE_INET6
+		if (use_inet6) {
+			if (inet_pton(AF_INET6, msk, mskp) != 1)
+				return -1;
+		} else
+#endif
+		if (inet_aton(msk, (struct in_addr *)mskp) == 0)
+			return -1;
+	} else {
+		/*
+		 * set x most significant bits
+		 */
+		bits = (int)strtol(msk, &endptr, 0);
+#ifdef	USE_INET6
+		if ((*endptr != '\0') ||
+		    ((bits > 32) && !use_inet6) || (bits < 0) ||
+		    ((bits > 128) && use_inet6))
+#else
+		if (*endptr != '\0' || bits > 32 || bits < 0)
+#endif
+			return -1;
+#ifdef	USE_INET6
+		if (use_inet6)
+			fill6bits(bits, mskp);
+		else
+#endif
+		if (bits == 0)
+			*mskp = 0;
+		else
+			*mskp = htonl(0xffffffff << (32 - bits));
+	}
+	return 0;
+}