From 65697c27345bdae19e5ca5d43ee15509e18b19ec Mon Sep 17 00:00:00 2001
From: Martin Willi <martin@revosec.ch>
Date: Fri, 29 Oct 2010 09:54:15 +0200
Subject: [PATCH] Added a CIDR notation based host constructor

---
 src/libstrongswan/utils/host.c | 35 ++++++++++++++++++++++++++++++++++
 src/libstrongswan/utils/host.h |  9 +++++++++
 2 files changed, 44 insertions(+)

diff --git a/src/libstrongswan/utils/host.c b/src/libstrongswan/utils/host.c
index 112d07e5cb..50e43d9926 100644
--- a/src/libstrongswan/utils/host.c
+++ b/src/libstrongswan/utils/host.c
@@ -561,6 +561,41 @@ host_t *host_create_from_chunk(int family, chunk_t address, u_int16_t port)
 	return &this->public;
 }
 
+/*
+ * Described in header.
+ */
+host_t *host_create_from_subnet(char *string, int *bits)
+{
+	char *pos, buf[64];
+	host_t *net;
+
+	pos = strchr(string, '/');
+	if (pos)
+	{
+		if (pos - string >= sizeof(buf))
+		{
+			return NULL;
+		}
+		strncpy(buf, string, pos - string);
+		buf[pos - string] = '\0';
+		*bits = atoi(pos + 1);
+		return host_create_from_string(buf, 0);
+	}
+	net = host_create_from_string(buf, 0);
+	if (net)
+	{
+		if (net->get_family(net) == AF_INET)
+		{
+			*bits = 32;
+		}
+		else
+		{
+			*bits = 128;
+		}
+	}
+	return net;
+}
+
 /*
  * Described in header.
  */
diff --git a/src/libstrongswan/utils/host.h b/src/libstrongswan/utils/host.h
index f5796154cf..0a1be6e477 100644
--- a/src/libstrongswan/utils/host.h
+++ b/src/libstrongswan/utils/host.h
@@ -189,6 +189,15 @@ host_t *host_create_from_chunk(int family, chunk_t address, u_int16_t port);
  */
 host_t *host_create_from_sockaddr(sockaddr_t *sockaddr);
 
+/**
+ * Create a host from a CIDR subnet definition (1.2.3.0/24), return bits.
+ *
+ * @param string		string to parse
+ * @param bits			gets the number of network bits in CIDR notation
+ * @return				network start address, NULL on error
+ */
+host_t *host_create_from_subnet(char *string, int *bits);
+
 /**
  * Create a host without an address, a "any" host.
  *