/// <summary>
/// Creates a peer address from a continuous byte array. This is useful if you don't know the size beforehand.
/// The new offset can be accessed through the Offset property.
/// </summary>
/// <param name="me">The serialized array.</param>
/// <param name="initialOffset">The offset where to start.</param>
public PeerAddress(sbyte[] me, int initialOffset)
{
// get the peer ID, this is independent of the type
long offset = initialOffset;
// get the options
int options = me[offset++] & Utils.Utils.MaskFf;
IsIPv6 = (options & Net6) > 0; // TODO static methods could be used instead
IsFirewalledUdp = (options & FirewallUdp) > 0;
IsFirewalledTcp = (options & FirewallTcp) > 0;
IsRelayed = (options & Relayed) > 0;
// get the relays
int relays = me[offset++] & Utils.Utils.MaskFf;
// first 3 bits are the size
RelaySize = (relays >> TypeBitSize) & Mask07;
// last 5 bits indicate if IPv6 or IPv4
var b = (byte)(relays & Mask1F); // TODO check if works (2x)
_relayType = new BitArray(b);
// get the ID
var tmp = new sbyte[Number160.ByteArraySize];
Array.Copy(me, offset, tmp, 0, Number160.ByteArraySize);
PeerId = new Number160(tmp);
offset += Number160.ByteArraySize;
PeerSocketAddress = PeerSocketAddress.Create(me, IsIPv4, offset);
offset = PeerSocketAddress.Offset;
if (RelaySize > 0)
{
PeerSocketAddresses = new List <PeerSocketAddress>(RelaySize);
for (int i = 0; i < RelaySize; i++)
{
var psa = PeerSocketAddress.Create(me, !_relayType.Get(i), offset);
PeerSocketAddresses.Add(psa);
offset = psa.Offset;
}
}
else
{
PeerSocketAddresses = EmptyPeerSocketAddresses;
}
Size = offset - initialOffset;
Offset = offset;
_hashCode = PeerId.GetHashCode();
}
/// <summary>
/// Creates a peer address from a byte buffer.
/// </summary>
/// <param name="buffer">The channel buffer to read from.</param>
public PeerAddress(AlternativeCompositeByteBuf buffer)
{
long readerIndex = buffer.ReaderIndex;
// get the type
int options = buffer.ReadByte();
IsIPv6 = (options & Net6) > 0;
IsFirewalledUdp = (options & FirewallUdp) > 0;
IsFirewalledTcp = (options & FirewallTcp) > 0;
IsRelayed = (options & Relayed) > 0;
// get the relays
int relays = buffer.ReadByte();
RelaySize = (relays >> TypeBitSize) & Mask07;
var b = (byte)(relays & Mask1F); // TODO check if works (2x)
_relayType = new BitArray(b);
// get the ID
var me = new sbyte[Number160.ByteArraySize];
buffer.ReadBytes(me);
PeerId = new Number160(me);
PeerSocketAddress = PeerSocketAddress.Create(buffer, IsIPv4);
if (RelaySize > 0)
{
PeerSocketAddresses = new List <PeerSocketAddress>(RelaySize);
for (int i = 0; i < RelaySize; i++)
{
PeerSocketAddresses.Add(PeerSocketAddress.Create(buffer, !_relayType.Get(i)));
}
}
else
{
PeerSocketAddresses = EmptyPeerSocketAddresses;
}
Size = buffer.ReaderIndex - readerIndex;
Offset = -1; // not used here
_hashCode = PeerId.GetHashCode();
}
/// <summary>
/// Creates a peer address if all the values are known.
/// </summary>
/// <param name="id">The ID of the peer.</param>
/// <param name="peerSocketAddress">The peer socket address including both ports UDP and TCP.</param>
/// <param name="isFirewalledTcp">Indicates if the peer is not reachable via UDP.</param>
/// <param name="isFirewalledUdp">Indicates if the peer is not reachable via TCP.</param>
/// <param name="isRelayed">Indicates if the peer is used as a relay.</param>
/// <param name="peerSocketAddresses">The relay peers.</param>
public PeerAddress(Number160 id, PeerSocketAddress peerSocketAddress, bool isFirewalledTcp, bool isFirewalledUdp,
bool isRelayed, ICollection <PeerSocketAddress> peerSocketAddresses)
{
PeerId = id;
int size = Number160.ByteArraySize;
PeerSocketAddress = peerSocketAddress;
_hashCode = id.GetHashCode();
IsIPv6 = peerSocketAddress.InetAddress.IsIPv6();
IsFirewalledUdp = isFirewalledUdp;
IsFirewalledTcp = isFirewalledTcp;
IsRelayed = isRelayed;
// header + TCP port + UDP port
size += HeaderSize + PortsSize + (IsIPv6 ? Utils.Utils.IPv6Bytes : Utils.Utils.IPv4Bytes);
if (PeerSocketAddresses == null)
{
PeerSocketAddresses = EmptyPeerSocketAddresses;
_relayType = EmptyRelayType;
RelaySize = 0;
}
else
{
RelaySize = PeerSocketAddresses.Count;
if (RelaySize > TypeBitSize)
{
throw new ArgumentException(String.Format("Can only store up to {0} relay peers. Tried to store {1} relay peers.", TypeBitSize, RelaySize));
}
PeerSocketAddresses = peerSocketAddresses;
_relayType = new BitArray(RelaySize);
}
int index = 0;
foreach (var psa in peerSocketAddresses)
{
bool isIPv6 = psa.InetAddress.IsIPv6();
_relayType.Set(index, isIPv6);
size += psa.Size();
index++;
}
Size = size;
Offset = -1; // not used here
}
/// <summary>
/// Serializes to an existing array.
/// </summary>
/// <param name="me">The array where the result should be stored.</param>
/// <param name="offset">The offset where to start to save the result in the byte array.</param>
/// <returns>The new offset.</returns>
public int ToByteArray(sbyte[] me, int offset)
{
// save the peer ID
int newOffset = offset;
me[newOffset++] = Options;
me[newOffset++] = Relays;
newOffset = PeerId.ToByteArray(me, newOffset);
// we store both the addresses of the peer and the relays
// currently, this is not needed as we don't consider asymmetric relays
newOffset = PeerSocketAddress.ToByteArray(me, newOffset);
foreach (var psa in PeerSocketAddresses)
{
newOffset = psa.ToByteArray(me, newOffset);
}
return(newOffset);
}
public PeerAddress ChangePeerSocketAddress(PeerSocketAddress peerSocketAddress)
{
return(new PeerAddress(PeerId, peerSocketAddress, IsFirewalledTcp, IsFirewalledUdp, IsRelayed, PeerSocketAddresses));
}
