public void パケット解釈_str0()
{
//exercise
var sut = new PacketDns(TestUtil.HexStream2Bytes(Str0));
//verify
Assert.That(sut.GetId(), Is.EqualTo((short)0x0003));
Assert.That(sut.GetCount(RrKind.QD), Is.EqualTo(1));
Assert.That(sut.GetCount(RrKind.AN), Is.EqualTo(0));
Assert.That(sut.GetCount(RrKind.NS), Is.EqualTo(4));
Assert.That(sut.GetCount(RrKind.AR), Is.EqualTo(4));
Assert.That(sut.GetRcode(), Is.EqualTo((short)0));
Assert.That(sut.GetAa(), Is.EqualTo(false));
Assert.That(sut.GetRd(), Is.EqualTo(true));
Assert.That(sut.GetDnsType(), Is.EqualTo(DnsType.Aaaa));
Assert.That(sut.GetRequestName(), Is.EqualTo("www.google.com."));
Assert.That(sut.GetRr(RrKind.QD, 0).ToString(), Is.EqualTo((new RrQuery("www.google.com.", DnsType.Aaaa)).ToString()));
Assert.That(sut.GetRr(RrKind.NS, 0).ToString(), Is.EqualTo((new RrNs("google.com.", 83400, "ns4.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.NS, 1).ToString(), Is.EqualTo((new RrNs("google.com.", 83400, "ns2.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.NS, 2).ToString(), Is.EqualTo((new RrNs("google.com.", 83400, "ns3.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.NS, 3).ToString(), Is.EqualTo((new RrNs("google.com.", 83400, "ns1.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 0).ToString(), Is.EqualTo((new RrA("ns1.google.com.", 83465, new Ip("216.239.32.10"))).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 1).ToString(), Is.EqualTo((new RrA("ns2.google.com.", 83563, new Ip("216.239.34.10"))).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 2).ToString(), Is.EqualTo((new RrA("ns3.google.com.", 83465, new Ip("216.239.36.10"))).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 3).ToString(), Is.EqualTo((new RrA("ns4.google.com.", 83465, new Ip("216.239.38.10"))).ToString()));
}
public void パケット解釈_str1()
{
//exercise
var sut = new PacketDns(TestUtil.HexStream2Bytes(Str1));
//verify
Assert.That(sut.GetId(), Is.EqualTo((short)0x0002));
Assert.That(sut.GetCount(RrKind.QD), Is.EqualTo(1));
Assert.That(sut.GetCount(RrKind.AN), Is.EqualTo(5));
Assert.That(sut.GetCount(RrKind.NS), Is.EqualTo(4));
Assert.That(sut.GetCount(RrKind.AR), Is.EqualTo(7));
Assert.That(sut.GetRcode(), Is.EqualTo((short)0));
Assert.That(sut.GetAa(), Is.EqualTo(false));
Assert.That(sut.GetRd(), Is.EqualTo(true));
Assert.That(sut.GetDnsType(), Is.EqualTo(DnsType.Mx));
Assert.That(sut.GetRequestName(), Is.EqualTo("gmail.com."));
Assert.That(sut.GetRr(RrKind.QD, 0).ToString(), Is.EqualTo((new RrQuery("gmail.com.", DnsType.Mx)).ToString()));
Assert.That(sut.GetRr(RrKind.AN, 0).ToString(), Is.EqualTo((new RrMx("gmail.com.", 3427, 10, "alt1.gmail-smtp-in.l.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.AN, 1).ToString(), Is.EqualTo((new RrMx("gmail.com.", 3427, 20, "alt2.gmail-smtp-in.l.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.AN, 2).ToString(), Is.EqualTo((new RrMx("gmail.com.", 3427, 30, "alt3.gmail-smtp-in.l.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.AN, 3).ToString(), Is.EqualTo((new RrMx("gmail.com.", 3427, 40, "alt4.gmail-smtp-in.l.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.AN, 4).ToString(), Is.EqualTo((new RrMx("gmail.com.", 3427, 5, "gmail-smtp-in.l.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.NS, 0).ToString(), Is.EqualTo((new RrNs("gmail.com.", 54413, "ns4.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.NS, 1).ToString(), Is.EqualTo((new RrNs("gmail.com.", 54413, "ns2.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.NS, 2).ToString(), Is.EqualTo((new RrNs("gmail.com.", 54413, "ns1.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.NS, 3).ToString(), Is.EqualTo((new RrNs("gmail.com.", 54413, "ns3.google.com.")).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 0).ToString(), Is.EqualTo((new RrA("gmail-smtp-in.l.google.com.", 295, new Ip("74.125.25.27"))).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 1).ToString(), Is.EqualTo((new RrA("alt2.gmail-smtp-in.l.google.com.", 60, new Ip("74.125.140.27"))).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 2).ToString(), Is.EqualTo((new RrA("alt4.gmail-smtp-in.l.google.com.", 149, new Ip("74.125.131.27"))).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 3).ToString(), Is.EqualTo((new RrA("ns1.google.com.", 54584, new Ip("216.239.32.10"))).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 4).ToString(), Is.EqualTo((new RrA("ns2.google.com.", 54578, new Ip("216.239.34.10"))).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 5).ToString(), Is.EqualTo((new RrA("ns3.google.com.", 54641, new Ip("216.239.36.10"))).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 6).ToString(), Is.EqualTo((new RrA("ns4.google.com.", 54520, new Ip("216.239.38.10"))).ToString()));
}
// 共通メソッド
// リクエスト送信して、サーバから返ったデータをDNSパケットとしてデコードする
// レスポンスが無い場合は、1秒でタイムアウトしてnullを返す
// rd = 再帰要求
private PacketDns lookup(DnsType dnsType, string name, bool rd = false)
{
//乱数で識別子生成
var id = (ushort)(new Random()).Next(100);
//送信パケット生成
var sp = new PacketDns(id, false, false, rd, false);
//質問フィールド追加
sp.AddRr(RrKind.QD, new RrQuery(name, dnsType));
//クライアントソケット生成、及び送信
var cl = new SockUdp(new Kernel(), new Ip(IpKind.V4Localhost), 53, null, sp.GetBytes());
//受信
//byte[] recvBuf = cl.Recv(1000);
var recvBuf = cl.Recv(3);
if (recvBuf.Length == 0)
{
//受信データが無い場合
return(null);
}
//System.out.println(string.Format("lookup(%s,\"%s\") recv().Length=%d", dnsType, name, recvBuf.Length));
//デコード
var p = new PacketDns(recvBuf);
//System.out.println(print(p));
return(p);
}
// 共通メソッド
//リソースレコードのToString()
private string Print(PacketDns p, RrKind rrKind, int n)
{
var o = p.GetRr(rrKind, n);
if (rrKind == RrKind.QD)
{
return(o.ToString());
}
return(Print(o));
}
public void パケット生成_MX()
{
//setUp
//exercise
//パケットの生成
const ushort id = (ushort)0xf00f;
const bool qr = true; //応答
const bool rd = false; //再帰要求(有効)
const bool aa = true; //権限(あり)
const bool ra = true;
var sut = new PacketDns(id, qr, aa, rd, ra);
sut.AddRr(RrKind.QD, new RrQuery("google.com.", DnsType.Mx));
sut.AddRr(RrKind.AN, new RrMx("google.com.", 0xa7d, 10, "smtp.google.com."));
sut.AddRr(RrKind.NS, new RrNs("google.com.", 0xa7d, "ns3.google.com."));
//生成したパケットのバイト配列で、再度パケットクラスを生成する
byte[] b = sut.GetBytes();
var p = new PacketDns(b);
//verify
Assert.That(p.GetAa(), Is.EqualTo(true));
Assert.That(p.GetId(), Is.EqualTo((ushort)0xf00f));
Assert.That(p.GetDnsType(), Is.EqualTo(DnsType.Mx));
Assert.That(p.GetCount(RrKind.QD), Is.EqualTo(1));
Assert.That(p.GetCount(RrKind.AN), Is.EqualTo(1));
Assert.That(p.GetCount(RrKind.NS), Is.EqualTo(1));
Assert.That(p.GetCount(RrKind.AR), Is.EqualTo(0));
Assert.That(p.GetRcode(), Is.EqualTo((short)0));
//DEBUG
//OneRr r = p.GetRr(RrKind.AN, 0);
Assert.That(p.GetRr(RrKind.AN, 0).ToString(), Is.EqualTo(new RrMx("google.com.", 0xa7d, 10, "smtp.google.com.").ToString()));
Assert.That(p.GetRr(RrKind.NS, 0).ToString(), Is.EqualTo(new RrNs("google.com.", 0xa7d, "ns3.google.com.").ToString()));
// Assert.That(p.GetRr(RrKind.NS, 1).ToString(), Is.EqualTo(new RrNs("google.com.", 0xa7d, "ns1.google.com.").ToString()));
// Assert.That(p.GetRr(RrKind.NS, 2).ToString(), Is.EqualTo(new RrNs("google.com.", 0xa7d, "ns4.google.com.").ToString()));
// Assert.That(p.GetRr(RrKind.NS, 3).ToString(), Is.EqualTo(new RrNs("google.com.", 0xa7d, "ns2.google.com.").ToString()));
//
// Assert.That(p.GetRr(RrKind.AR, 0).ToString(), Is.EqualTo(new RrA("ns1.google.com.", 0xb5e, new Ip("216.239.32.10")).ToString()));
// Assert.That(p.GetRr(RrKind.AR, 1).ToString(), Is.EqualTo(new RrA("ns2.google.com.", 0xbde, new Ip("216.239.34.10")).ToString()));
// Assert.That(p.GetRr(RrKind.AR, 2).ToString(), Is.EqualTo(new RrA("ns3.google.com.", 0xaf5, new Ip("216.239.36.10")).ToString()));
// Assert.That(p.GetRr(RrKind.AR, 3).ToString(), Is.EqualTo(new RrA("ns4.google.com.", 0xab3, new Ip("216.239.38.10")).ToString()));
}
public void パケット生成_A_NS()
{
//setUp
//exercise
//パケットの生成
const ushort id = 0x0005;
const bool qr = true; //応答
const bool rd = true; //再帰要求(有効)
const bool aa = false; //権限(なし)
const bool ra = true;
var sut = new PacketDns(id, qr, aa, rd, ra);
sut.AddRr(RrKind.QD, new RrQuery("www.google.com.", DnsType.Aaaa));
sut.AddRr(RrKind.NS, new RrNs("google.com.", 0xa7d, "ns3.google.com."));
sut.AddRr(RrKind.NS, new RrNs("google.com.", 0xa7d, "ns1.google.com."));
sut.AddRr(RrKind.NS, new RrNs("google.com.", 0xa7d, "ns4.google.com."));
sut.AddRr(RrKind.NS, new RrNs("google.com.", 0xa7d, "ns2.google.com."));
sut.AddRr(RrKind.AR, new RrA("ns1.google.com.", 0xb5e, new Ip("216.239.32.10")));
sut.AddRr(RrKind.AR, new RrA("ns2.google.com.", 0xbde, new Ip("216.239.34.10")));
sut.AddRr(RrKind.AR, new RrA("ns3.google.com.", 0xaf5, new Ip("216.239.36.10")));
sut.AddRr(RrKind.AR, new RrA("ns4.google.com.", 0xab3, new Ip("216.239.38.10")));
//生成したパケットのバイト配列で、再度パケットクラスを生成する
var p = new PacketDns(sut.GetBytes());
//verify
Assert.That(p.GetAa(), Is.EqualTo(false));
Assert.That(p.GetId(), Is.EqualTo((short)0x0005));
Assert.That(p.GetDnsType(), Is.EqualTo(DnsType.Aaaa));
Assert.That(p.GetCount(RrKind.QD), Is.EqualTo(1));
Assert.That(p.GetCount(RrKind.AN), Is.EqualTo(0));
Assert.That(p.GetCount(RrKind.NS), Is.EqualTo(4));
Assert.That(p.GetCount(RrKind.AR), Is.EqualTo(4));
Assert.That(p.GetRcode(), Is.EqualTo((short)0));
Assert.That(p.GetRr(RrKind.NS, 0).ToString(), Is.EqualTo(new RrNs("google.com.", 0xa7d, "ns3.google.com.").ToString()));
Assert.That(p.GetRr(RrKind.NS, 1).ToString(), Is.EqualTo(new RrNs("google.com.", 0xa7d, "ns1.google.com.").ToString()));
Assert.That(p.GetRr(RrKind.NS, 2).ToString(), Is.EqualTo(new RrNs("google.com.", 0xa7d, "ns4.google.com.").ToString()));
Assert.That(p.GetRr(RrKind.NS, 3).ToString(), Is.EqualTo(new RrNs("google.com.", 0xa7d, "ns2.google.com.").ToString()));
Assert.That(p.GetRr(RrKind.AR, 0).ToString(), Is.EqualTo(new RrA("ns1.google.com.", 0xb5e, new Ip("216.239.32.10")).ToString()));
Assert.That(p.GetRr(RrKind.AR, 1).ToString(), Is.EqualTo(new RrA("ns2.google.com.", 0xbde, new Ip("216.239.34.10")).ToString()));
Assert.That(p.GetRr(RrKind.AR, 2).ToString(), Is.EqualTo(new RrA("ns3.google.com.", 0xaf5, new Ip("216.239.36.10")).ToString()));
Assert.That(p.GetRr(RrKind.AR, 3).ToString(), Is.EqualTo(new RrA("ns4.google.com.", 0xab3, new Ip("216.239.38.10")).ToString()));
}
public void パケット解釈_str2()
{
//exercise
var sut = new PacketDns(TestUtil.HexStream2Bytes(Str2));
//verify
Assert.That(sut.GetId(), Is.EqualTo((short)0x0004));
Assert.That(sut.GetCount(RrKind.QD), Is.EqualTo(1));
Assert.That(sut.GetCount(RrKind.AN), Is.EqualTo(1));
Assert.That(sut.GetCount(RrKind.NS), Is.EqualTo(2));
Assert.That(sut.GetCount(RrKind.AR), Is.EqualTo(2));
Assert.That(sut.GetRcode(), Is.EqualTo((short)0));
Assert.That(sut.GetAa(), Is.EqualTo(false));
Assert.That(sut.GetRd(), Is.EqualTo(true));
Assert.That(sut.GetDnsType(), Is.EqualTo(DnsType.Soa));
Assert.That(sut.GetRequestName(), Is.EqualTo("nifty.com."));
Assert.That(sut.GetRr(RrKind.QD, 0).ToString(), Is.EqualTo((new RrQuery("nifty.com.", DnsType.Soa)).ToString()));
Assert.That(sut.GetRr(RrKind.AN, 0).ToString(), Is.EqualTo((new RrSoa("nifty.com.", 0x616, "ons0.nifty.ad.jp", "hostmaster.nifty.ad.jp", 0x0bfe4128, 0xe10, 0x384, 0x36ee80, 0x384)).ToString()));
Assert.That(sut.GetRr(RrKind.NS, 0).ToString(), Is.EqualTo((new RrNs("nifty.com.", 0x6d2, "ons0.nifty.ad.jp.")).ToString()));
Assert.That(sut.GetRr(RrKind.NS, 1).ToString(), Is.EqualTo((new RrNs("nifty.com.", 0x6d2, "ons1.nifty.ad.jp.")).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 0).ToString(), Is.EqualTo((new RrA("ons0.nifty.ad.jp.", 0x712, new Ip("202.248.37.77"))).ToString()));
Assert.That(sut.GetRr(RrKind.AR, 1).ToString(), Is.EqualTo((new RrA("ons1.nifty.ad.jp.", 0x6da, new Ip("202.248.20.156"))).ToString()));
}
//共通メソッド
//リソースレコードの数を表示する
private static string Print(PacketDns p)
{
return(string.Format("QD={0} AN={1} NS={2} AR={3}", p.GetCount(RrKind.QD), p.GetCount(RrKind.AN), p.GetCount(RrKind.NS), p.GetCount(RrKind.AR)));
}
