/**
* This creates Edges of a given type
*/
public void CreateEdgeTo(TransportAddress destination,
EdgeListener.EdgeCreationCallback ecb)
{
TransportAddress.TAType t = destination.TransportAddressType;
if( _el_map.Contains( t ) ) {
EdgeListener el = (EdgeListener)_el_map[ t ];
el.CreateEdgeTo( destination, ecb );
}
else {
ecb(false, null, new EdgeException("No EdgeListener for TA type: " +
t.ToString() ) );
}
}
/**
* It is imperative that the ECB be called and not ignored. Not
* calling back will leave the system in a stale state as it waits
* for the CreateEdgeTo to complete.
* @param ta TransportAddress to create an edge to
* @param ecb the EdgeCreationCallback to call when done
* @throw EdgeException if we try to call this before calling
*/
public abstract void CreateEdgeTo(TransportAddress ta, EdgeCreationCallback ecb);
/**
* At the end of the day, we will often allow as long as
* an address is not denied (@see SeriesTAAuthorizer),
* so this makes it a little easier for us to check
*/
public bool IsNotDenied(TransportAddress a) {
return (Authorize(a) != Decision.Deny);
}
public override TAAuthorizer.Decision Authorize(TransportAddress a) {
IPAddress ipa = null;
try {
ipa = (IPAddress)( ((IPTransportAddress) a).GetIPAddress() );
} catch (Exception x) {
ProtocolLog.WriteIf(ProtocolLog.Exceptions, String.Format(
"{0}", x));
}
if (ipa == null) {
return _result_on_mismatch;
}
byte[] add_bytes = ipa.GetAddressBytes();
int bits = _bit_c;
int block = 0;
bool match = true;
while( bits > 0 && match ) {
match = FirstBitsMatch( add_bytes[block], _nw_bytes[block], bits);
bits -= 8;
block++;
}
if( match ) {
return _result_on_match;
}
else {
return _result_on_mismatch;
}
}
public override TAAuthorizer.Decision Authorize(TransportAddress a) {
if (_denied_port == ((IPTransportAddress) a).Port) {
return TAAuthorizer.Decision.Deny;
} else {
//else this decision should not matter
return TAAuthorizer.Decision.None;
}
}
public LinkProtocolState(Linker l, TransportAddress ta, Edge e) {
_linker = l;
_node = l.LocalNode;
_contype = l.ConType;
_target_lock = null;
_lm_reply = new WriteOnce<LinkMessage>();
_x = new WriteOnce<Exception>();
_con = new WriteOnce<Connection>();
_ta = ta;
_is_finished = 0;
//Setup the edge:
_e = e;
_result = Result.None;
}
/**
* Given a TransportAddress, return the associated RestartState.
* If there are no more restarts, this returns null.
*/
protected RestartState GetRestartState(TransportAddress ta) {
RestartState rss = null;
lock( _ta_to_restart_state ) {
rss = (RestartState)_ta_to_restart_state[ta];
if( rss == null ) {
//This is the first time we are restarting
rss = new RestartState(this, ta);
}
else if (rss.RemainingAttempts > 0) {
//We have to decrement the remainingAttempts:
int ra = rss.RemainingAttempts - 1;
rss = new RestartState(this, ta, ra);
}
else {
/*
* The old TA has had it
*/
rss = null;
}
}
if( rss != null ) {
_ta_to_restart_state[rss.TA] = rss;
rss.FinishEvent += this.RestartHandler;
#if LINK_DEBUG
if (ProtocolLog.LinkDebug.Enabled) {
ProtocolLog.Write(ProtocolLog.LinkDebug,
String.Format("{0}: Linker({1}) restarting; remaining attempts: {2}",
_local_n.Address, _lid, rss.RemainingAttempts));
}
#endif
}
return rss;
}
public RestartState(Linker l, TransportAddress ta,
int remaining_attempts) {
_linker = l;
_ta = ta;
_restart_attempts = remaining_attempts;
_first_start = 1;
}
/**
* When a new Connection is added, we may need to update the list
* of TAs to make sure it is not too long, and that the it is sorted
* from most likely to least likely to be successful
* @param e the new Edge
* @param ta the TransportAddress our TA according to our peer
*/
public override void UpdateLocalTAs(Edge e, TransportAddress ta) {
if( e.TAType == this.TAType ) {
UdpEdge ue = (UdpEdge)e;
ue.PeerViewOfLocalTA = ta;
NatDataPoint dp = new LocalMappingChangePoint(DateTime.UtcNow, e, ta);
Interlocked.Exchange<NatHistory>(ref _nat_hist, _nat_hist + dp);
Interlocked.Exchange<IEnumerable>(ref _nat_tas, new NatTAs( _tas, _nat_hist ));
}
}
/*
* Implements the EdgeListener function to
* create edges of this type.
*/
public override void CreateEdgeTo(TransportAddress ta,
EdgeCreationCallback ecb)
{
if( !IsStarted )
{
// it should return null and not throw an exception
// for graceful disconnect and preventing others to
// connect to us after we've disconnected.
ecb(false, null, new EdgeException("Not started"));
return;
}
if( ta.TransportAddressType != this.TAType ) {
//Can't make an edge of this type
ecb(false, null, new EdgeException("Can't make edge of this type"));
return;
}
if( _ta_auth.Authorize(ta) == TAAuthorizer.Decision.Deny ) {
//Not authorized. Can't make this edge:
ecb(false, null, new EdgeException( ta.ToString() + " is not authorized") );
return;
}
int remote_id = ((SimulationTransportAddress) ta).ID;
//Get the edgelistener:
//Outbound edge:
int delay = 0;
if(_use_delay) {
if(LatencyMap != null) {
// id != 0, so we reduce all by 1
delay = LatencyMap[_listener_id][remote_id] / 1000;
} else {
lock(_sync) {
delay = _rand.Next(10, 250);
}
}
}
SimulationEdge se_l = new SimulationEdge(this, _listener_id, remote_id, false, delay);
AddEdge(se_l);
SimulationEdgeListener remote = (SimulationEdgeListener) _listener_map[remote_id];
if( remote != null ) {
//
// Make sure that the remote listener does not deny
// our TAs.
//
foreach (TransportAddress ta_local in LocalTAs) {
if (remote.TAAuth.Authorize(ta_local) == TAAuthorizer.Decision.Deny ) {
//Not authorized. Can't make this edge:
ecb(false, null, new EdgeException( ta_local.ToString() + " is not authorized by remote node.") );
return;
}
}
SimulationEdge se_r = new SimulationEdge(remote, remote_id, _listener_id, true, delay);
remote.AddEdge(se_r);
se_l.Partner = se_r;
se_r.Partner = se_l;
remote.SendEdgeEvent(se_r);
} else {
//There is no other edge, for now, we use "udp-like"
//behavior of just making an edge that goes nowhere.
}
ecb(true, se_l, null);
}
/**
* We will often create NodeInfo objects with only one
* TransportAddress. This constructor makes that easy.
*/
protected NodeInfo(Address a, TransportAddress ta)
{
_address = a;
_tas = new TransportAddress[]{ ta };
}
public static NodeInfo CreateInstance(IDictionary d) {
Address address = null;
IList tas;
object addr_str = d["address"];
if( addr_str != null ) {
address = AddressParser.Parse((string)addr_str);
}
IList trans = d["transports"] as IList;
if( trans != null ) {
int count = trans.Count;
tas = new TransportAddress[count];
for(int i = 0; i < count; i++) {
tas[i] = TransportAddressFactory.CreateInstance((string)trans[i]);
}
NodeInfo ni = CreateInstance(address, tas);
return ni;
}
else {
NodeInfo ni = CreateInstance(address);
return ni;
}
}
public static NodeInfo CreateInstance(Address a, TransportAddress ta) {
NodeInfo result = null;
Cache ni_cache = Interlocked.Exchange<Cache>(ref _cache, null);
if( ni_cache != null ) {
//Only one thread at the time can be in here:
try {
//Set up the key:
_cache_key._done_hash = false;
_cache_key._address = a;
_ta_list[0] = ta;
_cache_key._tas = _ta_list;
result = (NodeInfo)ni_cache[_cache_key];
if( result == null ) {
//This may look weird, but we are using a NodeInfo as a key
//to lookup NodeInfos, this will allow us to only keep one
//identical NodeInfo in scope at a time.
result = new NodeInfo(a, ta);
ni_cache[result] = result;
}
}
finally {
Interlocked.Exchange<Cache>(ref _cache, ni_cache);
}
}
else {
result = new NodeInfo(a, ta);
}
return result;
}
public FakeEdge(TransportAddress local, TransportAddress remote, TransportAddress.TAType tatype)
{
_tatype = tatype;
local_add = local;
remote_add = remote;
}
public FakeEdge(TransportAddress local, TransportAddress remote) :
this(local, remote, TransportAddress.TAType.Tcp)
{
}
public override TAAuthorizer.Decision Authorize(TransportAddress a) {
int port = ((IPTransportAddress) a).Port;
lock(_sync) {
if(!_allowed.Contains(port)) {
if(_rand.NextDouble() > _prob) {
_allowed[port] = TAAuthorizer.Decision.Allow;
} else {
_allowed[port] = TAAuthorizer.Decision.Deny;
}
}
}
return (TAAuthorizer.Decision) _allowed[port];
}
public EdgeWorker(Node n, TransportAddress ta) {
_n = n;
_ta = ta;
_result = new WriteOnce<EWResult>();
}
/**
* Implements the EdgeListener function to
* create edges of this type.
*/
public override void CreateEdgeTo(TransportAddress ta, EdgeCreationCallback ecb)
{
Edge e = null;
try {
if( !IsStarted )
{
throw new EdgeException("UdpEdgeListener is not started");
}
else if( ta.TransportAddressType != this.TAType ) {
throw new EdgeException(ta.TransportAddressType.ToString()
+ " is not my type: " + this.TAType.ToString() );
}
else if( _ta_auth.Authorize(ta) == TAAuthorizer.Decision.Deny ) {
//Too bad. Can't make this edge:
throw new EdgeException( ta.ToString() + " is not authorized");
}
else {
IPAddress first_ip = ((IPTransportAddress) ta).GetIPAddress();
IPEndPoint end = new IPEndPoint(first_ip, ((IPTransportAddress) ta).Port);
/* We have to keep our mapping of end point to edges up to date */
lock( _id_ht ) {
//Get a random ID for this edge:
int id;
do {
id = _rand.Next();
//Make sure we don't have negative ids
if( id < 0 ) { id = ~id; }
} while( _id_ht.Contains(id) || id == 0 );
e = new UdpEdge(this, false, end, _local_ep, id, 0);
_id_ht[id] = e;
}
NatDataPoint dp = new NewEdgePoint(DateTime.UtcNow, e);
Interlocked.Exchange<NatHistory>(ref _nat_hist, _nat_hist + dp);
Interlocked.Exchange<IEnumerable>(ref _nat_tas, new NatTAs( _tas, _nat_hist ));
/* Tell me when you close so I can clean up the table */
e.CloseEvent += this.CloseHandler;
ecb(true, e, null);
}
} catch(Exception ex) {
if( e != null ) {
//Clean up the edge
CloseHandler(e, null);
}
ecb(false, null, ex);
}
}
public RestartState(Linker l, TransportAddress ta)
: this(l, ta, _MAX_RESTARTS) {
}
/* //////////////////////////////
*
* Here are all the normal methods of TcpEdgeListener
*
* //////////////////////////////
*/
public override void CreateEdgeTo(TransportAddress ta, EdgeCreationCallback ecb)
{
try {
if( !IsStarted ) {
throw new EdgeException("TcpEdgeListener is not started");
}
else if( ta.TransportAddressType != TransportAddress.TAType.Tcp ) {
throw new EdgeException(ta.TransportAddressType.ToString()
+ " is not my type: Tcp");
}
else if( _ta_auth.Authorize(ta) == TAAuthorizer.Decision.Deny ) {
//Too bad. Can't make this edge:
throw new EdgeException( ta.ToString() + " is not authorized");
}
else {
//Everything looks good:
ArrayList tmp_ips = new ArrayList();
tmp_ips.Add(((IPTransportAddress)ta).GetIPAddress());
CreationState cs = new CreationState(ecb,
new Queue( tmp_ips ),
((IPTransportAddress) ta).Port,
this);
ActionQueue.Enqueue(cs);
}
} catch(Exception e) {
ecb(false, null, e);
}
}
/**
* This creates a TaskWorker that represents the next step that should
* be taken for the ta. It can only be two tasks: create the edge
* (EdgeWorker) or wait and try again (RestartState).
*
* We return null if:
* - the TA is null
* - Linker is finished
* - a Connection was already created
* - this TA has been restarted too many times
*
* If we cannot get a ConnectionTable.Lock with SetTarget, we return a
* RestartState to wait a little while to try to get the lock again.
*
* @returns the next TaskWorker that should be enqueued, does not start or
* Enqueue it.
*/
protected TaskWorker StartAttempt(TransportAddress next_ta) {
TaskWorker next_task = null;
if ( (next_ta == null) || (_added_cons != 0) || IsFinished || ConnectionInTable ) {
//Looks like we are already connected...
return null;
}
try {
#if LINK_DEBUG
if (ProtocolLog.LinkDebug.Enabled) {
ProtocolLog.Write(ProtocolLog.LinkDebug,
String.Format("{0}: Linker ({1}) attempting to lock {2}", _local_n.Address, _lid, _target));
}
#endif
/*
* If we cannot set this address as our target, we
* stop before we even try to make an edge.
*
* Locks flow around in complex ways, but we
* (or one of our LinkProtocolState)
* will hold the lock
*/
SetTarget();
#if LINK_DEBUG
if (ProtocolLog.LinkDebug.Enabled) {
ProtocolLog.Write(ProtocolLog.LinkDebug,
String.Format("{0}: Linker ({1}) acquired lock on {2}", _local_n.Address, _lid, _target));
ProtocolLog.Write(ProtocolLog.LinkDebug,
String.Format("{0}: Linker: ({1}) Trying TA: {2}", _local_n.Address, _lid, next_ta));
}
#endif
next_task = new EdgeWorker(_local_n, next_ta);
next_task.FinishEvent += this.EdgeWorkerHandler;
}
catch(CTLockException) {
/*
* If we cannot get a lock on the address in SetTarget()
* we wait and and try again
*/
#if LINK_DEBUG
if (ProtocolLog.LinkDebug.Enabled) {
ProtocolLog.Write(ProtocolLog.LinkDebug,
String.Format("{0}: Linker ({1}) failed to lock {2}", _local_n.Address, _lid, _target));
}
#endif
next_task = GetRestartState(next_ta);
}
catch(ConnectionExistsException) {
//We already have a connection to the target
}
catch(Exception) {
}
return next_task;
}
public override TAAuthorizer.Decision Authorize(TransportAddress a) {
if (_denied_id == ((SimulationTransportAddress)a).ID) {
return TAAuthorizer.Decision.Deny;
} else {
//else this decision should not matter
return TAAuthorizer.Decision.None;
}
}
/**
* Go through the list of Authorizers returning the first decision
*/
public override TAAuthorizer.Decision Authorize(TransportAddress a) {
TAAuthorizer.Decision result = TAAuthorizer.Decision.None;
foreach(TAAuthorizer ipa in _authorizers) {
result = ipa.Authorize(a);
if( result != TAAuthorizer.Decision.None ) {
break;
}
}
return result;
}
public TATypeAuthorizer(TransportAddress.TAType[] list,
TAAuthorizer.Decision on_match,
TAAuthorizer.Decision on_mismatch) {
_on_match = on_match;
_on_mismatch = on_mismatch;
_match_table = new Dictionary<TransportAddress.TAType, bool>();
foreach(TransportAddress.TAType tatype in list) {
_match_table[tatype] = true;
}
}
public override TAAuthorizer.Decision Authorize(TransportAddress a) {
if (_deny_list.Contains(a)) {
return TAAuthorizer.Decision.Deny;
}
// randomly deny the TA
if (_rand.NextDouble() > _deny_prob) {
_deny_list.Add(a);
return TAAuthorizer.Decision.Deny;
}
return TAAuthorizer.Decision.Allow;
}
public override TAAuthorizer.Decision Authorize(TransportAddress a) {
if(_match_table.ContainsKey(a.TransportAddressType)) {
return _on_match;
}
return _on_mismatch;
}
/**
* @return the Decision for this TransportAddress
*/
public virtual Decision Authorize(TransportAddress a) {
return Decision.None;
}
/*
* Implements the EdgeListener function to
* create edges of this type.
*/
public override void CreateEdgeTo(TransportAddress ta,
EdgeCreationCallback ecb)
{
if( !IsStarted )
{
// it should return null and not throw an exception
// for graceful disconnect and preventing others to
// connect to us after we've disconnected.
ecb(false, null, new EdgeException("Not started"));
return;
}
#if FUNCTION_DEBUG
foreach (TransportAddress local_ta in LocalTAs) {
Console.Error.WriteLine("Create edge local: {0} <-> remote {1}.", local_ta, ta);
}
#endif
if( ta.TransportAddressType != this.TAType ) {
//Can't make an edge of this type
#if FUNCTION_DEBUG
Console.Error.WriteLine("Can't make edge of this type.");
#endif
ecb(false, null, new EdgeException("Can't make edge of this type"));
return;
}
if( _ta_auth.Authorize(ta) == TAAuthorizer.Decision.Deny ) {
//Not authorized. Can't make this edge:
#if FUNCTION_DEBUG
Console.Error.WriteLine("Can't make edge. Remote TA {0} is not authorized locally.", ta);
#endif
ecb(false, null,
new EdgeException( ta.ToString() + " is not authorized") );
return;
}
int remote_id = ((IPTransportAddress) ta).Port;
//Get the edgelistener:
//Outbound edge:
FunctionEdge fe_l = new FunctionEdge(this, _listener_id,
remote_id, false);
lock( _listener_map ) {
FunctionEdgeListener remote
= (FunctionEdgeListener) _listener_map[remote_id];
if( remote != null ) {
//
// Make sure that the remote listener does not deny
// our TAs.
//
foreach (TransportAddress ta_local in LocalTAs) {
if (remote.TAAuth.Authorize(ta_local) == TAAuthorizer.Decision.Deny ) {
//Not authorized. Can't make this edge:
#if FUNCTION_DEBUG
Console.Error.WriteLine("Can't make edge. local TA {0} is not authorized remotely by {1}.", ta_local, ta);
#endif
ecb(false, null,
new EdgeException( ta_local.ToString() + " is not authorized by remote node.") );
return;
}
}
FunctionEdge fe_r = new FunctionEdge(remote, remote_id,
_listener_id, true);
fe_l.Partner = fe_r;
fe_r.Partner = fe_l;
remote.SendEdgeEvent(fe_r);
}
else {
//There is no other edge, for now, we use "udp-like"
//behavior of just making an edge that goes nowhere.
}
ecb(true, fe_l, null);
}
}
public override TAAuthorizer.Decision Authorize(TransportAddress a) {
return _dec;
}
public RestartState(Linker l, TransportAddress ta,
int remaining_attempts) {
_linker = l;
_ta = ta;
_restart_attempts = remaining_attempts;
//Compute the interval:
Random rand = new Random();
int restart_sec = rand.Next(_MS_RESTART_TIME);
_interval = new TimeSpan(0,0,0,0,restart_sec);
}
