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.

---
 src/main/java/io/trygvis/rules/acme/IpCalc.java | 67 +++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 src/main/java/io/trygvis/rules/acme/IpCalc.java

(limited to 'src/main/java/io/trygvis/rules/acme/IpCalc.java')

diff --git a/src/main/java/io/trygvis/rules/acme/IpCalc.java b/src/main/java/io/trygvis/rules/acme/IpCalc.java
new file mode 100644
index 0000000..5369d62
--- /dev/null
+++ b/src/main/java/io/trygvis/rules/acme/IpCalc.java
@@ -0,0 +1,67 @@
+package io.trygvis.rules.acme;
+
+import io.trygvis.rules.network.Ipv4Cidr;
+
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Pattern;
+
+public class IpCalc {
+    private static final Pattern pattern = Pattern.compile("([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})\\.([0-9]{1,3})/([0-9]{1,3})");
+
+    public static class FirstLast {
+        public final int first;
+        public final int last;
+
+        public FirstLast(int first, int last) {
+            this.first = first;
+            this.last = last;
+        }
+    }
+
+    public static Ipv4Cidr cidr(String cidr) {
+        var matcher = pattern.matcher(cidr);
+        if (!matcher.matches()) {
+            throw new IllegalArgumentException("Not a CIDR: " + cidr);
+        }
+
+        var b1 = matcher.group(1);
+        var b2 = matcher.group(2);
+        var b3 = matcher.group(3);
+        var b4 = matcher.group(4);
+
+        int network = parse(b1) << 24 |
+                parse(b2) << 16 |
+                parse(b3) << 8 |
+                parse(b4);
+
+//        System.out.printf("network = %x%n", network);
+
+        var l = matcher.group(5);
+        var bits = Integer.parseInt(l);
+        var hostBits = 32 - bits;
+        int size = 1 << hostBits;
+
+        int netmask = (-1 >> hostBits) << hostBits;
+//        System.out.printf("netmask = %08x%n", netmask);
+
+        int x = network & ~netmask;
+
+        if (x != 0) {
+            throw new IllegalArgumentException("Not a CIDR: " + cidr);
+        }
+
+        return new Ipv4Cidr(network, netmask, size, bits);
+    }
+
+    private static int parse(String s) {
+        var i = Integer.parseInt(s);
+        if (i > 255) {
+            throw new IllegalArgumentException("Not a CIDR");
+        }
+
+        return i;
+    }
+}
-- 
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