From bd2208922ea6a0486074c72a57b01d7df368f885 Mon Sep 17 00:00:00 2001 From: Trygve Laugstøl Date: Wed, 6 Jan 2021 09:12:56 +0100 Subject: Generating IP addresses. --- src/main/java/io/trygvis/rules/acme/IpCalc.java | 67 ++++++++++++++++++++++ src/main/java/io/trygvis/rules/engine/Main.java | 11 +++- .../java/io/trygvis/rules/network/Ipv4Address.java | 35 +++++++++++ .../java/io/trygvis/rules/network/Ipv4Cidr.java | 40 +++++++++++++ src/main/resources/io/trygvis/rules/acme/vpn.drl | 23 +++++++- .../java/io/trygvis/rules/acme/IpCalcTest.java | 27 +++++++++ 6 files changed, 197 insertions(+), 6 deletions(-) create mode 100644 src/main/java/io/trygvis/rules/acme/IpCalc.java create mode 100644 src/main/java/io/trygvis/rules/network/Ipv4Address.java create mode 100644 src/main/java/io/trygvis/rules/network/Ipv4Cidr.java create mode 100644 src/test/java/io/trygvis/rules/acme/IpCalcTest.java (limited to 'src') 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; + } +} diff --git a/src/main/java/io/trygvis/rules/engine/Main.java b/src/main/java/io/trygvis/rules/engine/Main.java index 5556db7..6f04a98 100644 --- a/src/main/java/io/trygvis/rules/engine/Main.java +++ b/src/main/java/io/trygvis/rules/engine/Main.java @@ -3,6 +3,8 @@ package io.trygvis.rules.engine; import io.trygvis.rules.acme.AcmeIo; import io.trygvis.rules.dns.DnsEntry; import io.trygvis.rules.machine.Machine; +import io.trygvis.rules.network.Ipv4Address; +import io.trygvis.rules.network.Ipv4Cidr; import org.drools.core.audit.WorkingMemoryConsoleLogger; import org.kie.api.KieServices; import org.kie.api.event.rule.AgendaEventListener; @@ -38,9 +40,12 @@ public class Main { io.dump("phase-1", session.getFactHandles()); - io.dump("vpn0", session.getFactHandles(), (Object o) -> { - return o.getClass().getName().contains("Wg") || o instanceof Machine || o instanceof DnsEntry; - }); + io.dump("vpn0", session.getFactHandles(), (Object o) -> + o.getClass().getName().contains("Wg") || + o instanceof Machine || + o instanceof DnsEntry || + o instanceof Ipv4Cidr || + o instanceof Ipv4Address); session.dispose(); } diff --git a/src/main/java/io/trygvis/rules/network/Ipv4Address.java b/src/main/java/io/trygvis/rules/network/Ipv4Address.java new file mode 100644 index 0000000..071bca9 --- /dev/null +++ b/src/main/java/io/trygvis/rules/network/Ipv4Address.java @@ -0,0 +1,35 @@ +package io.trygvis.rules.network; + +import com.fasterxml.jackson.core.JsonGenerator; +import com.fasterxml.jackson.databind.JsonSerializer; +import com.fasterxml.jackson.databind.SerializerProvider; +import com.fasterxml.jackson.databind.annotation.JsonSerialize; + +import java.io.IOException; + +@JsonSerialize(using = Ipv4Address.Serializer.class) +public class Ipv4Address { + public final int address; + + public Ipv4Address(int address) { + this.address = address; + } + + @Override + public String toString() { + return "%d.%d.%d.%d".formatted( + address >> 24 & 0xff, + address >> 16 & 0xff, + address >> 8 & 0xff, + address & 0xff); + } + + public static class Serializer extends JsonSerializer { + @Override + public void serialize(Ipv4Address value, JsonGenerator gen, SerializerProvider serializers) throws IOException { + gen.writeStartObject(); + gen.writeObjectField("value", value.toString()); + gen.writeEndObject(); + } + } +} 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 addresses() { + var end = network + size; + var addresses = new ArrayList(size); + for (int address = network; address < end; address++) { + addresses.add(new Ipv4Address(address)); + } + + return addresses; + } +} diff --git a/src/main/resources/io/trygvis/rules/acme/vpn.drl b/src/main/resources/io/trygvis/rules/acme/vpn.drl index 90cdce2..0f0b3c8 100644 --- a/src/main/resources/io/trygvis/rules/acme/vpn.drl +++ b/src/main/resources/io/trygvis/rules/acme/vpn.drl @@ -4,13 +4,30 @@ import java.util.ArrayList import io.trygvis.rules.machine.Machine; import io.trygvis.rules.dns.DnsEntry; import io.trygvis.rules.acme.AcmeServer -import io.trygvis.rules.acme.WgHost; +import io.trygvis.rules.network.Ipv4Address +import io.trygvis.rules.network.Ipv4Cidr dialect "mvel" declare WgNet - name : String - domain : String + name : String + domain : String + linkCidr : String + networkCidr : String +end + +rule "Create link network" when + $net : WgNet() + not(Ipv4Cidr(network == IpCalc.cidr($net.linkCidr).network)) +then + insert(IpCalc.cidr($net.linkCidr)) +end + +rule "Create link network addresses" when + $cidr : Ipv4Cidr() + $addresses : Ipv4Address() from $cidr.addresses +then + insert($addresses) end declare WgHost diff --git a/src/test/java/io/trygvis/rules/acme/IpCalcTest.java b/src/test/java/io/trygvis/rules/acme/IpCalcTest.java new file mode 100644 index 0000000..8b1e2c6 --- /dev/null +++ b/src/test/java/io/trygvis/rules/acme/IpCalcTest.java @@ -0,0 +1,27 @@ +package io.trygvis.rules.acme; + +import org.junit.jupiter.api.Assertions; +import org.junit.jupiter.api.Test; +import org.junit.jupiter.params.ParameterizedTest; +import org.junit.jupiter.params.provider.ValueSource; + +import static org.junit.jupiter.api.Assertions.*; + +class IpCalcTest { + + @Test + public void basic() { + Assertions.assertThrows(IllegalArgumentException.class, () -> IpCalc.cidr("192.168.1.1/24").addresses()); + assertEquals(256, IpCalc.cidr("192.168.1.0/24").addresses().size()); + assertEquals(128, IpCalc.cidr("192.168.1.128/25").addresses().size()); + } + + @ParameterizedTest + @ValueSource(strings = { + "192.168.1.0/24", + "192.168.1.128/25", + }) + public void testParsing(String s) { + assertEquals(s, IpCalc.cidr(s).toString()); + } +} -- cgit v1.2.3