diff options
Diffstat (limited to 'module/ri-engine/src/main/java/io/trygvis/rules/network/Ipv4Cidr.java')
-rw-r--r-- | module/ri-engine/src/main/java/io/trygvis/rules/network/Ipv4Cidr.java | 114 |
1 files changed, 106 insertions, 8 deletions
diff --git a/module/ri-engine/src/main/java/io/trygvis/rules/network/Ipv4Cidr.java b/module/ri-engine/src/main/java/io/trygvis/rules/network/Ipv4Cidr.java index e69cd02..8e812ef 100644 --- a/module/ri-engine/src/main/java/io/trygvis/rules/network/Ipv4Cidr.java +++ b/module/ri-engine/src/main/java/io/trygvis/rules/network/Ipv4Cidr.java @@ -4,22 +4,35 @@ 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 org.checkerframework.checker.nullness.compatqual.NonNullType; +import javax.annotation.Nonnull; import java.io.IOException; import java.util.ArrayList; -import java.util.Collection; +import java.util.List; +import java.util.Objects; +import java.util.regex.Pattern; @JsonSerialize(using = Ipv4Cidr.Serializer.class) -public class Ipv4Cidr { +public class Ipv4Cidr implements Comparable<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) { + public Ipv4Cidr(int network, int bits) { + if (bits < 0 || bits > 32) { + throw new IllegalArgumentException("bits must be [0, 32]"); + } + + int hostBits = 32 - bits; + int netmask = (-1 >> hostBits) << hostBits; + + int x = network & ~netmask; + + if (x != 0) { + throw new IllegalArgumentException("The host part of the address must be 0."); + } + this.network = network; - this.netmask = netmask; - this.size = size; this.bits = bits; } @@ -33,7 +46,29 @@ public class Ipv4Cidr { bits); } - public Collection<Ipv4Address> addresses() { + private String formatIpv4(int address) { + return "%d.%d.%d.%d".formatted(address >> 24 & 0xff, address >> 16 & 0xff, address >> 8 & 0xff, address & 0xff); + } + + public List<Ipv4Cidr> partition(int bits) { + if (bits <= 0 || bits <= this.bits || bits > 32) { + throw new IllegalArgumentException("Invalid new network size"); + } + + var list = new ArrayList<Ipv4Cidr>(); + + int count = 1 << (bits - this.bits); + for (int i = 0; i < count; i++) { + var network = this.network | (i << (32 - bits)); + + list.add(new Ipv4Cidr(network, bits)); + } + + return list; + } + + public List<Ipv4Address> addresses() { + int size = 1 << 32 - bits; var end = network + size; var addresses = new ArrayList<Ipv4Address>(size); for (int address = network; address < end; address++) { @@ -43,6 +78,69 @@ public class Ipv4Cidr { return addresses; } + @Override + public int compareTo(Ipv4Cidr o) { + if (this == o) { + return 0; + } + + var ret = network - o.network; + if (ret == 0) { + return ret; + } + + return bits - o.bits; + } + + @Override + public boolean equals(Object o) { + if (this == o) return true; + if (o == null || getClass() != o.getClass()) return false; + Ipv4Cidr ipv4Cidr = (Ipv4Cidr) o; + return network == ipv4Cidr.network && bits == ipv4Cidr.bits; + } + + @Override + public int hashCode() { + return Objects.hash(network, bits); + } + + 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 Ipv4Cidr parseCidr(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); +// System.out.printf("netmask = %08x%n", netmask); + + return new Ipv4Cidr(network, bits); + } + + private static int parse(String s) { + var i = Integer.parseInt(s); + if (i > 255) { + throw new IllegalArgumentException("Not a CIDR"); + } + + return i; + } + public static class Serializer extends JsonSerializer<Ipv4Cidr> { @Override public void serialize(Ipv4Cidr value, JsonGenerator gen, SerializerProvider serializers) throws IOException { |