From bd2208922ea6a0486074c72a57b01d7df368f885 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Wed, 6 Jan 2021 09:12:56 +0100
Subject: Generating IP addresses.

---
 .../java/io/trygvis/rules/network/Ipv4Cidr.java    | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 src/main/java/io/trygvis/rules/network/Ipv4Cidr.java

(limited to 'src/main/java/io/trygvis/rules/network/Ipv4Cidr.java')

diff --git a/src/main/java/io/trygvis/rules/network/Ipv4Cidr.java b/src/main/java/io/trygvis/rules/network/Ipv4Cidr.java
new file mode 100644
index 0000000..34b3a0b
--- /dev/null
+++ b/src/main/java/io/trygvis/rules/network/Ipv4Cidr.java
@@ -0,0 +1,40 @@
+package io.trygvis.rules.network;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.Collection;
+
+public class Ipv4Cidr {
+    public final int network;
+    public final int netmask;
+    public final int size;
+    public final int bits;
+
+    public Ipv4Cidr(int network, int netmask, int size, int bits) {
+        this.network = network;
+        this.netmask = netmask;
+        this.size = size;
+        this.bits = bits;
+    }
+
+    @Override
+    public String toString() {
+        return "%d.%d.%d.%d/%d".formatted(
+                network >> 24 & 0xff,
+                network >> 16 & 0xff,
+                network >> 8 & 0xff,
+                network & 0xff,
+                bits);
+    }
+
+    public Collection<Ipv4Address> addresses() {
+        var end = network + size;
+        var addresses = new ArrayList<Ipv4Address>(size);
+        for (int address = network; address < end; address++) {
+            addresses.add(new Ipv4Address(address));
+        }
+
+        return addresses;
+    }
+}
-- 
cgit v1.2.3