Update all new Tasks
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190
Task/Parse-an-IP-Address/Java/parse-an-ip-address-1.java
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Task/Parse-an-IP-Address/Java/parse-an-ip-address-1.java
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import java.net.Inet6Address;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.util.regex.Pattern;
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import javax.xml.bind.DatatypeConverter;
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/**
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* Parses ipv4 and ipv6 addresses. Emits each described IP address as a
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* hexadecimal integer representing the address, the address space, and the port
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* number specified, if any.
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*/
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public class IPParser {
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/*
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* Using regex to ensure that the address is a valid one. This allows for
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* separating by format and ensures that the operations done on a format
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* will be valid.
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*/
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// 0.0.0.0-255.255.255.255
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private final String ipv4segment =
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"(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])";
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// 0-65535
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private final String portsegment =
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":(?:6553[0-5]|655[0-2][0-9]|65[0-4][0-9]{2}|"
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+ "6[0-4][0-9]{3}|[1-5][0-9]{4}|[1-9][0-9]{1,3}|[0-9])";
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private final String ipv4address = "(" + ipv4segment + "\\.){3,3}"
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+ ipv4segment;
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private final String ipv4addressWithPort = ipv4address + portsegment + "?";
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private final String ipv6segment = "[a-fA-F0-9]{1,4}";
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private final String ipv6address = "(" +
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// 1:2:3:4:5:6:7:8
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"(" + ipv6segment + ":){7,7}" + ipv6segment + "|" +
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// 1::, 1:2:3:4:5:6:7::
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"(" + ipv6segment + ":){1,7}:|" +
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// 1::8, 1:2:3:4:5:6::8, 1:2:3:4:5:6::8
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"(" + ipv6segment + ":){1,6}:" + ipv6segment + "|" +
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// 1::7:8, 1:2:3:4:5::7:8, 1:2:3:4:5::8
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"(" + ipv6segment + ":){1,5}(:" + ipv6segment + "){1,2}|" +
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// 1::6:7:8, 1:2:3:4::6:7:8, 1:2:3:4::8
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"(" + ipv6segment + ":){1,4}(:" + ipv6segment + "){1,3}|" +
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// 1::5:6:7:8, 1:2:3::5:6:7:8, 1:2:3::8
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"(" + ipv6segment + ":){1,3}(:" + ipv6segment + "){1,4}|" +
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// # 1::4:5:6:7:8, 1:2::4:5:6:7:8, 1:2::8
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"(" + ipv6segment + ":){1,2}(:" + ipv6segment + "){1,5}|" +
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// # 1::3:4:5:6:7:8, 1::3:4:5:6:7:8, 1::8
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ipv6segment + ":((:" + ipv6segment + "){1,6})|" +
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// ::2:3:4:5:6:7:8, ::2:3:4:5:6:7:8, ::8, ::
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":((:" + ipv6segment + "){1,7}|:)|" +
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// fe80::7:8%eth0, fe80::7:8%1 (link-local IPv6 addresses with
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// zone index)
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"fe80:(:" + ipv6segment + "){0,4}%[0-9a-zA-Z]{1,}|" +
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// ::255.255.255.255, ::ffff:255.255.255.255,
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// ::ffff:0:255.255.255.255 (IPv4-mapped IPv6 addresses and
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// IPv4-translated addresses)
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"::(ffff(:0{1,4}){0,1}:){0,1}" + ipv4address + "|" +
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// 2001:db8:3:4::192.0.2.33, 64:ff9b::192.0.2.33 (IPv4-Embedded
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// IPv6 Address)
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"(" + ipv6segment + ":){1,4}:" + ipv4address + ")";
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private final String ipv6addressWithPort = "\\[" + ipv6address + "\\]"
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+ portsegment + "?";
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/**
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* Parses ipv4 and ipv6 addresses. Emits each described IP address as a
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* hexadecimal integer representing the address, the address space, and the
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* port number specified, if any.
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*
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* @param address the address to analyze
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*/
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public void parse(String address) {
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// Used for storing values to be printed
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String space = "";// ipv4, ipv6, or unknown
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String hex = "";// hex value of the address
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String port = "";// the port or unknown
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// Try to match the pattern with one of the 2 types, with or without a
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// port
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if (Pattern.matches("^" + ipv4address + "$", address)) {
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InetAddress a;
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space = "IPv4";
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try {
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a = InetAddress.getByName(address);
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hex = DatatypeConverter.printHexBinary(a.getAddress());
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}
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catch (UnknownHostException e) {
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e.printStackTrace();
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hex = "Invalid";
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}
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port = "Absent";
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}
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else if (Pattern.matches("^" + ipv4addressWithPort + "$", address)) {
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String[] parts = address.split("\\.");
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port = parts[3].split(":")[1];
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parts[3] = parts[3].split(":")[0];
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InetAddress a;
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space = "IPv4";
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try {
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address = parts[0] + parts[1] + parts[2] + parts[3];
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a = InetAddress.getByName(address);
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hex = DatatypeConverter.printHexBinary(a.getAddress());
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}
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catch (UnknownHostException e) {
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e.printStackTrace();
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hex = "Invalid";
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}
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}
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else if (Pattern.matches("^" + ipv6address + "$", address)) {
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InetAddress a;
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space = "IPv6";
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try {
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a = Inet6Address.getByName(address);
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hex = DatatypeConverter.printHexBinary(a.getAddress());
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}
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catch (UnknownHostException e) {
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e.printStackTrace();
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hex = "Invalid";
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}
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port = "Absent";
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}
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else if (Pattern.matches("^" + ipv6addressWithPort + "$", address)) {
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String[] parts = address.split(":");
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InetAddress a;
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space = "IPv6";
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address =
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address.replace("[", "").replace("]", "")
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.replaceAll(portsegment + "$", "");
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try {
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a = Inet6Address.getByName(address);
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hex = DatatypeConverter.printHexBinary(a.getAddress());
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}
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catch (UnknownHostException e) {
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e.printStackTrace();
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hex = "Invalid";
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}
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port = parts[parts.length - 1];
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}
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else {
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// Not a valid address
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hex = "Invalid";
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space = "Invalid";
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port = "Invalid";
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}
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// Output the findings to the console
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System.out.println("Test case: '" + address + "'");
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System.out.println("Space: " + space);
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System.out.println("Address: " + hex);
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System.out.println("Port: " + port);
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System.out.println();
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}
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/**
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* Tests the parser using various addresses.
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*
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* @param args arguments for the program
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*/
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public static void main(String[] args) {
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IPParser parser = new IPParser();
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// The "localhost" IPv4 address
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parser.parse("127.0.0.1");
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// The "localhost" IPv4 address, with a specified port (80)
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parser.parse("127.0.0.1:80");
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// The "localhost" IPv6 address
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parser.parse("::1");
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// The "localhost" IPv6 address, with a specified port (80)
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parser.parse("[::1]:80");
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// Rosetta Code's primary server's public IPv6 address
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parser.parse("2605:2700:0:3::4713:93e3");
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// Rosetta Code's primary server's public IPv6 address, with a specified
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// port (80)
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parser.parse("[2605:2700:0:3::4713:93e3]:80");
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// ipv6 space
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parser.parse("::ffff:192.168.173.22");
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// ipv6 space with port
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parser.parse("[::ffff:192.168.173.22]:80");
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// trailing compression
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parser.parse("1::");
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// trailing compression with port
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parser.parse("[1::]:80");
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// 'any' address compression
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parser.parse("::");
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// 'any' address compression with port
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parser.parse("[::]:80");
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}
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}
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59
Task/Parse-an-IP-Address/Java/parse-an-ip-address-2.java
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59
Task/Parse-an-IP-Address/Java/parse-an-ip-address-2.java
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Test case: '127.0.0.1'
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Space: IPv4
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Address: 7F000001
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Port: Absent
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Test case: '127.0.0.1:80'
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Space: IPv4
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Address: 0001F019
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Port: 80
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Test case: '::1'
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Space: IPv6
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Address: 00000000000000000000000000000001
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Port: Absent
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Test case: '[::1]:80'
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Space: IPv6
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Address: 00000000000000000000000000000001
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Port: 80
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Test case: '2605:2700:0:3::4713:93e3'
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Space: IPv6
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Address: 260527000000000300000000471393E3
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Port: Absent
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Test case: '[2605:2700:0:3::4713:93e3]:80'
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Space: IPv6
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Address: 260527000000000300000000471393E3
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Port: 80
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Test case: '::ffff:192.168.173.22'
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Space: IPv6
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Address: C0A8AD16
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Port: Absent
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Test case: '[::ffff:192.168.173.22]:80'
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Space: IPv6
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Address: C0A8AD16
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Port: 80
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Test case: '1::'
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Space: IPv6
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Address: 00010000000000000000000000000000
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Port: Absent
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Test case: '[1::]:80'
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Space: IPv6
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Address: 00010000000000000000000000000000
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Port: 80
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Test case: '::'
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Space: IPv6
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Address: 00000000000000000000000000000000
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Port: Absent
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Test case: '[::]:80'
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Space: IPv6
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Address: 00000000000000000000000000000000
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Port: 80
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