1 files changed, 93 insertions, 0 deletions
diff --git a/sbin/ipf/libipf/alist_new.c b/sbin/ipf/libipf/alist_new.c
new file mode 100644
index 000000000000..0f6a9c29940d
--- /dev/null
+++ b/sbin/ipf/libipf/alist_new.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2012 by Darren Reed.
+ *
+ * See the IPFILTER.LICENCE file for details on licencing.
+ *
+ * $Id: alist_new.c,v 1.5.2.2 2012/07/22 08:04:24 darren_r Exp $
+ */
+
+#include "ipf.h"
+#include <ctype.h>
+
+alist_t *
+alist_new(int family, char *host)
+{
+	int a, b, c, d, bits;
+	char *slash;
+	alist_t *al;
+	u_int mask;
+
+	if (family == AF_UNSPEC) {
+		if (strchr(host, ':') != NULL)
+			family = AF_INET6;
+		else
+			family = AF_INET;
+	}
+	if (family != AF_INET && family != AF_INET6)
+		return (NULL);
+
+	al = calloc(1, sizeof(*al));
+	if (al == NULL) {
+		fprintf(stderr, "alist_new out of memory\n");
+		return (NULL);
+	}
+
+	while (ISSPACE(*host))
+		host++;
+
+	if (*host == '!') {
+		al->al_not = 1;
+		host++;
+		while (ISSPACE(*host))
+			host++;
+	}
+
+	bits = -1;
+	slash = strchr(host, '/');
+	if (slash != NULL) {
+		*slash = '\0';
+		bits = atoi(slash + 1);
+	}
+
+	if (family == AF_INET) {
+		if (bits > 32)
+			goto bad;
+
+		a = b = c = d = -1;
+		sscanf(host, "%d.%d.%d.%d", &a, &b, &c, &d);
+
+		if (bits > 0 && bits < 33) {
+			mask = 0xffffffff << (32 - bits);
+		} else if (b == -1) {
+			mask = 0xff000000;
+			b = c = d = 0;
+		} else if (c == -1) {
+			mask = 0xffff0000;
+			c = d = 0;
+		} else if (d == -1) {
+			mask = 0xffffff00;
+			d = 0;
+		} else {
+			mask = 0xffffffff;
+		}
+		al->al_mask = htonl(mask);
+	} else {
+		if (bits > 128)
+			goto bad;
+		fill6bits(bits, al->al_i6mask.i6);
+	}
+
+	if (gethost(family, host, &al->al_i6addr) == -1) {
+		if (slash != NULL)
+			*slash = '/';
+		fprintf(stderr, "Cannot parse hostname\n");
+		goto bad;
+	}
+	al->al_family = family;
+	if (slash != NULL)
+		*slash = '/';
+	return (al);
+bad:
+	free(al);
+	return (NULL);
+}