import ipfilter 4.1.8 into the vendor branch

1 files changed, 44 insertions, 0 deletions

diff --git a/contrib/ipfilter/lib/buildopts.c b/contrib/ipfilter/lib/buildopts.c
new file mode 100644
index 0000000..a35649b
--- /dev/null
+++ b/contrib/ipfilter/lib/buildopts.c
@@ -0,0 +1,44 @@
+/*	$NetBSD$	*/
+
+/*
+ * Copyright (C) 1993-2001 by Darren Reed.
+ *
+ * See the IPFILTER.LICENCE file for details on licencing.
+ *
+ * Id: buildopts.c,v 1.6 2002/01/28 06:50:45 darrenr Exp
+ */
+
+#include "ipf.h"
+
+
+u_32_t buildopts(cp, op, len)
+char *cp, *op;
+int len;
+{
+	struct ipopt_names *io;
+	u_32_t msk = 0;
+	char *s, *t;
+	int inc;
+
+	for (s = strtok(cp, ","); s; s = strtok(NULL, ",")) {
+		if ((t = strchr(s, '=')))
+			*t++ = '\0';
+		for (io = ionames; io->on_name; io++) {
+			if (strcasecmp(s, io->on_name) || (msk & io->on_bit))
+				continue;
+			if ((inc = addipopt(op, io, len, t))) {
+				op += inc;
+				len += inc;
+			}
+			msk |= io->on_bit;
+			break;
+		}
+		if (!io->on_name) {
+			fprintf(stderr, "unknown IP option name %s\n", s);
+			return 0;
+		}
+	}
+	*op++ = IPOPT_EOL;
+	len++;
+	return len;
+}