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net.i2p.data.i2np.DeliveryInstructions Maven / Gradle / Ivy
package net.i2p.data.i2np;
/*
* free (adj.): unencumbered; not under the control of others
* Written by jrandom in 2003 and released into the public domain
* with no warranty of any kind, either expressed or implied.
* It probably won't make your computer catch on fire, or eat
* your children, but it might. Use at your own risk.
*
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import net.i2p.data.DataFormatException;
import net.i2p.data.DataHelper;
import net.i2p.data.DataStructureImpl;
import net.i2p.data.Hash;
import net.i2p.data.SessionKey;
import net.i2p.data.TunnelId;
//import net.i2p.util.Log;
/**
* Contains the delivery instructions for garlic cloves.
* Generic "delivery instructions" are used both in tunnel messages
* and in garlic cloves, with slight differences.
* However,
* the tunnel message generator TrivialPreprocessor and reader FragmentHandler do not use this class,
* the reading and writing is handled inline there.
*
* @author jrandom
*/
public class DeliveryInstructions extends DataStructureImpl {
//private final static Log _log = new Log(DeliveryInstructions.class);
//private boolean _encrypted;
//private SessionKey _encryptionKey;
private int _deliveryMode;
public final static int DELIVERY_MODE_LOCAL = 0;
public final static int DELIVERY_MODE_DESTINATION = 1;
public final static int DELIVERY_MODE_ROUTER = 2;
public final static int DELIVERY_MODE_TUNNEL = 3;
private Hash _destinationHash;
private Hash _routerHash;
private TunnelId _tunnelId;
private boolean _delayRequested;
private long _delaySeconds;
private final static int FLAG_MODE_LOCAL = 0;
private final static int FLAG_MODE_DESTINATION = 1;
private final static int FLAG_MODE_ROUTER = 2;
private final static int FLAG_MODE_TUNNEL = 3;
/** @deprecated unused */
@Deprecated
private final static int FLAG_ENCRYPTED = 128;
private final static int FLAG_MODE = 96;
private final static int FLAG_DELAY = 16;
/**
* Immutable local instructions, no options
*
* @since 0.9.9
*/
public static final DeliveryInstructions LOCAL = new LocalInstructions();
/**
* Returns immutable local instructions, or new
*
* @since 0.9.20
*/
public static DeliveryInstructions create(byte[] data, int offset) throws DataFormatException {
if (data[offset] == 0)
return LOCAL;
DeliveryInstructions rv = new DeliveryInstructions();
rv.readBytes(data, offset);
return rv;
}
public DeliveryInstructions() {
_deliveryMode = -1;
}
/**
* For cloves only (not tunnels), default false, unused
* @deprecated unused
*/
@Deprecated
public boolean getEncrypted() { return /* _encrypted */ false; }
/**
* For cloves only (not tunnels), default false, unused
* @deprecated unused
*/
@Deprecated
public void setEncrypted(boolean encrypted) { /* _encrypted = encrypted; */ }
/**
* For cloves only (not tunnels), default null, unused
* @deprecated unused
*/
@Deprecated
public SessionKey getEncryptionKey() { return /* _encryptionKey */ null; }
/**
* For cloves only (not tunnels), default null, unused
* @deprecated unused
*/
@Deprecated
public void setEncryptionKey(SessionKey key) { /* _encryptionKey = key; */ }
/** default -1 */
public int getDeliveryMode() { return _deliveryMode; }
/** @param mode 0-3 */
public void setDeliveryMode(int mode) { _deliveryMode = mode; }
/** default null */
public Hash getDestination() { return _destinationHash; }
/** required for DESTINATION */
public void setDestination(Hash dest) { _destinationHash = dest; }
/** default null */
public Hash getRouter() { return _routerHash; }
/** required for ROUTER or TUNNEL */
public void setRouter(Hash router) { _routerHash = router; }
/** default null */
public TunnelId getTunnelId() { return _tunnelId; }
/** required for TUNNEL */
public void setTunnelId(TunnelId id) { _tunnelId = id; }
/**
* default false, unused
* @deprecated unused
*/
@Deprecated
public boolean getDelayRequested() { return _delayRequested; }
/**
* default false, unused
* @deprecated unused
*/
@Deprecated
public void setDelayRequested(boolean req) { _delayRequested = req; }
/**
* default 0, unused
* @deprecated unused
*/
@Deprecated
public long getDelaySeconds() { return _delaySeconds; }
/**
* default 0, unused
* @deprecated unused
*/
@Deprecated
public void setDelaySeconds(long seconds) { _delaySeconds = seconds; }
/**
* @deprecated unused
* @throws UnsupportedOperationException always
*/
@Deprecated
public void readBytes(InputStream in) {
throw new UnsupportedOperationException();
}
public int readBytes(byte data[], int offset) throws DataFormatException {
int cur = offset;
int flags = data[cur] & 0xff;
cur++;
//if (_log.shouldLog(Log.DEBUG))
// _log.debug("Read flags: " + flags + " mode: " + flagMode(flags));
/****
if (flagEncrypted(flags)) {
byte kd[] = new byte[SessionKey.KEYSIZE_BYTES];
System.arraycopy(data, cur, kd, 0, SessionKey.KEYSIZE_BYTES);
cur += SessionKey.KEYSIZE_BYTES;
setEncryptionKey(new SessionKey(kd));
setEncrypted(true);
} else {
setEncrypted(false);
}
****/
setDeliveryMode(flagMode(flags));
switch (flagMode(flags)) {
case FLAG_MODE_LOCAL:
break;
case FLAG_MODE_DESTINATION:
//byte destHash[] = new byte[Hash.HASH_LENGTH];
//System.arraycopy(data, cur, destHash, 0, Hash.HASH_LENGTH);
Hash dh = Hash.create(data, cur);
cur += Hash.HASH_LENGTH;
setDestination(dh);
break;
case FLAG_MODE_ROUTER:
//byte routerHash[] = new byte[Hash.HASH_LENGTH];
//System.arraycopy(data, cur, routerHash, 0, Hash.HASH_LENGTH);
Hash rh = Hash.create(data, cur);
cur += Hash.HASH_LENGTH;
setRouter(rh);
break;
case FLAG_MODE_TUNNEL:
//byte tunnelRouterHash[] = new byte[Hash.HASH_LENGTH];
//System.arraycopy(data, cur, tunnelRouterHash, 0, Hash.HASH_LENGTH);
Hash trh = Hash.create(data, cur);
cur += Hash.HASH_LENGTH;
setRouter(trh);
setTunnelId(new TunnelId(DataHelper.fromLong(data, cur, 4)));
cur += 4;
break;
}
if (flagDelay(flags)) {
long delay = DataHelper.fromLong(data, cur, 4);
cur += 4;
setDelayRequested(true);
setDelaySeconds(delay);
} else {
setDelayRequested(false);
}
return cur - offset;
}
/**
* For cloves only (not tunnels), default false, unused
*/
/****
private static boolean flagEncrypted(long flags) {
return (0 != (flags & FLAG_ENCRYPTED));
}
****/
/** high bits */
private static int flagMode(int flags) {
int v = flags & FLAG_MODE;
v >>>= 5;
return v;
}
/** unused */
private static boolean flagDelay(int flags) {
return (0 != (flags & FLAG_DELAY));
}
private int getFlags() {
int val = 0;
/****
if (getEncrypted())
val = val | FLAG_ENCRYPTED;
****/
switch (getDeliveryMode()) {
case FLAG_MODE_LOCAL:
break;
case FLAG_MODE_DESTINATION:
val = FLAG_MODE_DESTINATION << 5;
break;
case FLAG_MODE_ROUTER:
val = FLAG_MODE_ROUTER << 5;
break;
case FLAG_MODE_TUNNEL:
val = FLAG_MODE_TUNNEL << 5;
break;
}
if (getDelayRequested())
val |= FLAG_DELAY;
//if (_log.shouldLog(Log.DEBUG))
// _log.debug("getFlags() = " + val);
return val;
}
private int getAdditionalInfoSize() {
int additionalSize = 0;
/****
if (getEncrypted()) {
if (_encryptionKey == null) throw new IllegalStateException("Encryption key is not set");
additionalSize += SessionKey.KEYSIZE_BYTES;
}
****/
switch (getDeliveryMode()) {
case FLAG_MODE_LOCAL:
//if (_log.shouldLog(Log.DEBUG))
// _log.debug("mode = local");
break;
case FLAG_MODE_DESTINATION:
if (_destinationHash == null) throw new IllegalStateException("Destination hash is not set");
additionalSize += Hash.HASH_LENGTH;
break;
case FLAG_MODE_ROUTER:
if (_routerHash == null) throw new IllegalStateException("Router hash is not set");
additionalSize += Hash.HASH_LENGTH;
break;
case FLAG_MODE_TUNNEL:
if ( (_routerHash == null) || (_tunnelId == null) ) throw new IllegalStateException("Router hash or tunnel ID is not set");
additionalSize += Hash.HASH_LENGTH;
additionalSize += 4; // tunnelId
break;
}
if (getDelayRequested()) {
additionalSize += 4;
}
return additionalSize;
}
/****
private byte[] getAdditionalInfo() {
int additionalSize = getAdditionalInfoSize();
byte rv[] = new byte[additionalSize];
int offset = 0;
offset += getAdditionalInfo(rv, offset);
if (offset != additionalSize)
//_log.log(Log.CRIT, "size mismatch, additionalSize = " + additionalSize + ", offset = " + offset);
throw new IllegalStateException("size mismatch, additionalSize = " + additionalSize + ", offset = " + offset);
return rv;
}
****/
/** */
private int getAdditionalInfo(byte rv[], int offset) {
int origOffset = offset;
/****
if (getEncrypted()) {
if (_encryptionKey == null) throw new IllegalStateException("Encryption key is not set");
System.arraycopy(_encryptionKey.getData(), 0, rv, offset, SessionKey.KEYSIZE_BYTES);
offset += SessionKey.KEYSIZE_BYTES;
if (_log.shouldLog(Log.DEBUG))
_log.debug("IsEncrypted");
} else {
if (_log.shouldLog(Log.DEBUG))
_log.debug("Is NOT Encrypted");
}
****/
switch (getDeliveryMode()) {
case FLAG_MODE_LOCAL:
//if (_log.shouldLog(Log.DEBUG))
// _log.debug("mode = local");
break;
case FLAG_MODE_DESTINATION:
if (_destinationHash == null) throw new IllegalStateException("Destination hash is not set");
System.arraycopy(_destinationHash.getData(), 0, rv, offset, Hash.HASH_LENGTH);
offset += Hash.HASH_LENGTH;
//if (_log.shouldLog(Log.DEBUG))
// _log.debug("mode = destination, hash = " + _destinationHash);
break;
case FLAG_MODE_ROUTER:
if (_routerHash == null) throw new IllegalStateException("Router hash is not set");
System.arraycopy(_routerHash.getData(), 0, rv, offset, Hash.HASH_LENGTH);
offset += Hash.HASH_LENGTH;
//if (_log.shouldLog(Log.DEBUG))
// _log.debug("mode = router, routerHash = " + _routerHash);
break;
case FLAG_MODE_TUNNEL:
if ( (_routerHash == null) || (_tunnelId == null) ) throw new IllegalStateException("Router hash or tunnel ID is not set");
System.arraycopy(_routerHash.getData(), 0, rv, offset, Hash.HASH_LENGTH);
offset += Hash.HASH_LENGTH;
DataHelper.toLong(rv, offset, 4, _tunnelId.getTunnelId());
offset += 4;
//if (_log.shouldLog(Log.DEBUG))
// _log.debug("mode = tunnel, tunnelId = " + _tunnelId.getTunnelId()
// + ", routerHash = " + _routerHash);
break;
}
if (getDelayRequested()) {
//if (_log.shouldLog(Log.DEBUG))
// _log.debug("delay requested: " + getDelaySeconds());
DataHelper.toLong(rv, offset, 4, getDelaySeconds());
offset += 4;
} else {
//if (_log.shouldLog(Log.DEBUG))
// _log.debug("delay NOT requested");
}
return offset - origOffset;
}
/**
* @deprecated unused
* @throws UnsupportedOperationException always
*/
@Deprecated
public void writeBytes(OutputStream out) {
throw new UnsupportedOperationException();
}
/**
* @return the number of bytes written to the target
*/
public int writeBytes(byte target[], int offset) {
if ( (_deliveryMode < 0) || (_deliveryMode > FLAG_MODE_TUNNEL) ) throw new IllegalStateException("Invalid data: mode = " + _deliveryMode);
int flags = getFlags();
//if (_log.shouldLog(Log.DEBUG))
// _log.debug("Write flags: " + flags + " mode: " + getDeliveryMode()
// + " =?= " + flagMode(flags));
int origOffset = offset;
target[offset++] = (byte) flags;
offset += getAdditionalInfo(target, offset);
return offset - origOffset;
}
public int getSize() {
return 1 // flags
+ getAdditionalInfoSize();
}
@Override
public boolean equals(Object obj) {
if ( (obj == null) || !(obj instanceof DeliveryInstructions))
return false;
DeliveryInstructions instr = (DeliveryInstructions)obj;
return (getDelayRequested() == instr.getDelayRequested()) &&
(getDelaySeconds() == instr.getDelaySeconds()) &&
(getDeliveryMode() == instr.getDeliveryMode()) &&
//(getEncrypted() == instr.getEncrypted()) &&
DataHelper.eq(getDestination(), instr.getDestination()) &&
DataHelper.eq(getEncryptionKey(), instr.getEncryptionKey()) &&
DataHelper.eq(getRouter(), instr.getRouter()) &&
DataHelper.eq(getTunnelId(), instr.getTunnelId());
}
@Override
public int hashCode() {
return (int)getDelaySeconds() +
getDeliveryMode() +
DataHelper.hashCode(getDestination()) +
DataHelper.hashCode(getEncryptionKey()) +
DataHelper.hashCode(getRouter()) +
DataHelper.hashCode(getTunnelId());
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder(128);
buf.append("[DeliveryInstructions: ");
buf.append("\n\tDelivery mode: ");
switch (getDeliveryMode()) {
case DELIVERY_MODE_LOCAL:
buf.append("Local");
break;
case DELIVERY_MODE_DESTINATION:
buf.append("Destination");
break;
case DELIVERY_MODE_ROUTER:
buf.append("Router");
break;
case DELIVERY_MODE_TUNNEL:
buf.append("Tunnel");
break;
}
if (_delayRequested)
buf.append("\n\tDelay seconds: ").append(_delaySeconds);
if (_destinationHash != null)
buf.append("\n\tDestination: ").append(_destinationHash.toBase32());
//buf.append("\n\tEncrypted: ").append(getEncrypted());
//buf.append("\n\tEncryption key: ").append(getEncryptionKey());
if (_routerHash != null)
buf.append("\n\tRouter: ").append(_routerHash.toBase64());
if (_tunnelId != null)
buf.append("\n\tTunnelId: ").append(_tunnelId);
return buf.toString();
}
/**
* An immutable local delivery instructions with no options
* for efficiency.
*
* @since 0.9.9
*/
private static final class LocalInstructions extends DeliveryInstructions {
//private static final byte flag = DELIVERY_MODE_LOCAL << 5; // 0
@Override
public void setEncrypted(boolean encrypted) {
throw new RuntimeException("immutable");
}
@Override
public void setEncryptionKey(SessionKey key) {
throw new RuntimeException("immutable");
}
@Override
public int getDeliveryMode() { return DELIVERY_MODE_LOCAL; }
@Override
public void setDeliveryMode(int mode) {
throw new RuntimeException("immutable");
}
@Override
public void setDestination(Hash dest) {
throw new RuntimeException("immutable");
}
@Override
public void setRouter(Hash router) {
throw new RuntimeException("immutable");
}
@Override
public void setTunnelId(TunnelId id) {
throw new RuntimeException("immutable");
}
@Override
public void setDelayRequested(boolean req) {
throw new RuntimeException("immutable");
}
@Override
public void setDelaySeconds(long seconds) {
throw new RuntimeException("immutable");
}
@Override
public int readBytes(byte data[], int offset) throws DataFormatException {
throw new RuntimeException("immutable");
}
@Override
public int writeBytes(byte target[], int offset) {
target[offset] = 0;
return 1;
}
@Override
public int getSize() {
return 1;
}
@Override
public String toString() {
return "[DeliveryInstructions: " +
"\n\tDelivery mode: " +
"local]";
}
}
}
