src/ClientList.cpp

   1 //
   2 // This file is part of the aMule Project.
   3 //
   4 // Copyright (c) 2003-2008 aMule Team ( admin@amule.org / http://www.amule.org )
   5 // Copyright (c) 2002-2008 Merkur ( devs@emule-project.net / http://www.emule-project.net )
   6 //
   7 // Any parts of this program derived from the xMule, lMule or eMule project,
   8 // or contributed by third-party developers are copyrighted by their
   9 // respective authors.
  10 //
  11 // This program is free software; you can redistribute it and/or modify
  12 // it under the terms of the GNU General Public License as published by
  13 // the Free Software Foundation; either version 2 of the License, or
  14 // (at your option) any later version.
  15 //
  16 // This program is distributed in the hope that it will be useful,
  17 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 // GNU General Public License for more details.
  20 //
  21 // You should have received a copy of the GNU General Public License
  22 // along with this program; if not, write to the Free Software
  23 // Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA
  24 //
  25
  26 #include "ClientList.h"         // Interface declarations.
  27
  28 #include <protocol/Protocols.h>
  29 #include <protocol/ed2k/Constants.h>
  30 #include <protocol/kad/Client2Client/UDP.h>
  31 #include <protocol/kad/Constants.h>
  32 #include <protocol/kad2/Client2Client/TCP.h>
  33
  34 #include "amule.h"              // Needed for theApp
  35 #include "ClientTCPSocket.h"    // Needed for CClientTCPSocket
  36 #include "DownloadQueue.h"      // Needed for CDownloadQueue
  37 #include "UploadQueue.h"        // Needed for CUploadQueue
  38 #include "IPFilter.h"           // Needed for CIPFIlter
  39 #include "updownclient.h"       // Needed for CUpDownClient
  40 #include "Preferences.h"        // Needed for thePrefs
  41 #include "Statistics.h"         // Needed for theStats
  42 #include "Logger.h"
  43 #include "GuiEvents.h"          // Needed for Notify_*
  44 #include "Packet.h"
  45
  46 #include <common/Format.h>
  47
  48 #include "kademlia/kademlia/Search.h"
  49 #include "kademlia/kademlia/SearchManager.h"
  50 #include "kademlia/kademlia/UDPFirewallTester.h"
  51 #include "kademlia/net/KademliaUDPListener.h"
  52 #include "kademlia/routing/Contact.h"
  53
  54
  55 /**
  56  * CDeletedClient Class
  57  *
  58  * This class / list is a bit overkill, but currently needed to avoid any
  59  * exploit possibility. It will keep track of certain clients attributes
  60  * for 2 hours, while the CUpDownClient object might be deleted already.
  61  * Currently saves: IP, Port, UserHash.
  62  */
  63 class CDeletedClient
  64 {
  65 public:
  66         CDeletedClient(CUpDownClient* pClient)
  67         {
  68                 m_dwInserted = ::GetTickCount();
  69                 PortAndHash porthash = { pClient->GetUserPort(), pClient->GetCreditsHash()};
  70                 m_ItemsList.push_back(porthash);
  71         }
  72
  73         struct PortAndHash
  74         {
  75                 uint16 nPort;
  76                 void* pHash;
  77         };
  78
  79         typedef std::list<PortAndHash> PaHList;
  80         PaHList m_ItemsList;
  81         uint32  m_dwInserted;
  82 };
  83
  84
  85
  86 CClientList::CClientList()
  87         : m_deadSources( true )
  88 {
  89         m_dwLastBannCleanUp = 0;
  90         m_dwLastTrackedCleanUp = 0;
  91         m_dwLastClientCleanUp = 0;
  92         m_pBuddy = NULL;
  93         m_nBuddyStatus = Disconnected;
  94 #ifdef __WXDEBUG__
  95         m_delete_queue_closed = false;
  96 #endif
  97 }
  98
  99
 100 CClientList::~CClientList()
 101 {
 102         DeleteContents(m_trackedClientsList);
 103
 104         wxASSERT(m_clientList.empty());
 105         wxASSERT(m_delete_queue.empty());
 106 }
 107
 108
 109 void CClientList::AddClient( CUpDownClient* toadd )
 110 {
 111         // Ensure that only new clients can be added to the list
 112         if ( toadd->GetClientState() == CS_NEW ) {
 113                 // Update the client-state
 114                 toadd->m_clientState = CS_LISTED;
 115
 116                 Notify_ClientCtrlAddClient( toadd );
 117
 118                 // We always add the ID/ptr pair, regardles of the actual ID value
 119                 m_clientList.insert( IDMapPair( toadd->GetUserIDHybrid(), toadd ) );
 120
 121                 // We only add the IP if it is valid
 122                 if ( toadd->GetIP() ) {
 123                         m_ipList.insert( IDMapPair( toadd->GetIP(), toadd ) );
 124                 }
 125
 126                 // We only add the hash if it is valid
 127                 if ( toadd->HasValidHash() ) {
 128                         m_hashList.insert( HashMapPair( toadd->GetUserHash(), toadd ) );
 129                 }
 130
 131                 toadd->UpdateStats();
 132         }
 133 }
 134
 135
 136 void CClientList::AddToDeleteQueue(CUpDownClient* client)
 137 {
 138         RemoveFromKadList( client );
 139         RemoveDirectCallback( client );
 140
 141         // We have to remove the client from the list immediatly, to avoit it getting
 142         // found by functions such as AttachToAlreadyKnown and GetClientsFromIP,
 143         // however, if the client isn't on the clientlist, then it is safe to delete
 144         // it right now. Otherwise, push it onto the queue.
 145         if ( RemoveIDFromList( client ) ) {
 146                 // Also remove the ip and hash entries
 147                 RemoveIPFromList( client );
 148                 RemoveHashFromList( client );
 149
 150                 wxASSERT(!m_delete_queue_closed);
 151                 m_delete_queue.push_back( client );
 152         } else {
 153                 delete client;
 154         }
 155 }
 156
 157
 158 void CClientList::UpdateClientID( CUpDownClient* client, uint32 newID )
 159 {
 160         // Sanity check
 161         if ( ( client->GetClientState() != CS_LISTED ) || ( client->GetUserIDHybrid() == newID ) )
 162                 return;
 163
 164         // First remove the ID entry
 165         RemoveIDFromList( client );
 166
 167         // Add the new entry
 168         m_clientList.insert( IDMapPair( newID, client ) );
 169 }
 170
 171
 172 void CClientList::UpdateClientIP( CUpDownClient* client, uint32 newIP )
 173 {
 174         // Sanity check
 175         if ( ( client->GetClientState() != CS_LISTED ) || ( client->GetIP() == newIP ) )
 176                 return;
 177
 178         // Remove the old IP entry
 179         RemoveIPFromList( client );
 180
 181         if ( newIP ) {
 182                 m_ipList.insert( IDMapPair( newIP, client ) );
 183         }
 184 }
 185
 186
 187 void CClientList::UpdateClientHash( CUpDownClient* client, const CMD4Hash& newHash )
 188 {
 189         // Sanity check
 190         if ( ( client->GetClientState() != CS_LISTED ) || ( client->GetUserHash() == newHash ) )
 191                 return;
 192
 193
 194         // Remove the old entry
 195         RemoveHashFromList( client );
 196
 197         // And add the new one if valid
 198         if ( !newHash.IsEmpty() ) {
 199                 m_hashList.insert( HashMapPair( newHash, client ) );
 200         }
 201 }
 202
 203
 204 bool CClientList::RemoveIDFromList( CUpDownClient* client )
 205 {
 206         bool result = false;
 207
 208         // First remove the ID entry
 209         std::pair<IDMap::iterator, IDMap::iterator> range = m_clientList.equal_range( client->GetUserIDHybrid() );
 210
 211         for ( ; range.first != range.second; ++range.first ) {
 212                 if ( client == range.first->second ) {
 213                         /* erase() will invalidate the iterator, but we're not using it anymore
 214                             anyway (notice the break;) */
 215                         m_clientList.erase( range.first );
 216                         result = true;
 217
 218                         break;
 219                 }
 220         }
 221
 222         return result;
 223 }
 224
 225
 226 void CClientList::RemoveIPFromList( CUpDownClient* client )
 227 {
 228         // Check if we need to look for the IP entry
 229         if ( !client->GetIP() ) {
 230                 return;
 231         }
 232
 233         // Remove the IP entry
 234         std::pair<IDMap::iterator, IDMap::iterator> range = m_ipList.equal_range( client->GetIP() );
 235
 236         for ( ; range.first != range.second; ++range.first ) {
 237                 if ( client == range.first->second ) {
 238                         /* erase() will invalidate the iterator, but we're not using it anymore
 239                             anyway (notice the break;) */
 240                         m_ipList.erase( range.first );
 241                         break;
 242                 }
 243         }
 244 }
 245
 246 void CClientList::RemoveHashFromList( CUpDownClient* client )
 247 {
 248         // Nothing to remove
 249         if ( !client->HasValidHash() ) {
 250                 return;
 251         }
 252
 253         // Find all items with the specified hash
 254         std::pair<HashMap::iterator, HashMap::iterator> range = m_hashList.equal_range( client->GetUserHash() );
 255
 256         for ( ; range.first != range.second; ++range.first ) {
 257                 if ( client == range.first->second ) {
 258                         /* erase() will invalidate the iterator, but we're not using it anymore
 259                             anyway (notice the break;) */
 260                         m_hashList.erase( range.first );
 261                         break;
 262                 }
 263         }
 264 }
 265
 266
 267 CUpDownClient* CClientList::FindMatchingClient( CUpDownClient* client )
 268 {
 269         typedef std::pair<IDMap::const_iterator, IDMap::const_iterator> IDMapIteratorPair;
 270         wxCHECK(client, NULL);
 271
 272         const uint32 userIP = client->GetIP();
 273         const uint32 userID = client->GetUserIDHybrid();
 274         const uint16 userPort = client->GetUserPort();
 275         const uint16 userKadPort = client->GetKadPort();
 276
 277
 278         // LowID clients need a different set of checks
 279         if (client->HasLowID()) {
 280                 // User is firewalled ... Must do two checks.
 281                 if (userIP && (userPort || userKadPort)) {
 282                         IDMapIteratorPair range = m_ipList.equal_range(userIP);
 283
 284                         for ( ; range.first != range.second; ++range.first ) {
 285                                 CUpDownClient* other = range.first->second;
 286                                 wxASSERT(userIP == other->GetIP());
 287
 288                                 if (userPort && (userPort == other->GetUserPort())) {
 289                                         return other;
 290                                   } else if (userKadPort && (userKadPort == other->GetKadPort())) {
 291                                         return other;
 292                                 }
 293                         }
 294                 }
 295
 296                 const uint32 serverIP = client->GetServerIP();
 297                 const uint32 serverPort = client->GetServerPort();
 298                 if (userID && serverIP && serverPort) {
 299                         IDMapIteratorPair range = m_clientList.equal_range(userID);
 300
 301                         for (; range.first != range.second; ++range.first) {
 302                                 CUpDownClient* other = range.first->second;
 303                                 wxASSERT(userID == other->GetUserIDHybrid());
 304
 305                                 // For lowid, we also have to check the server
 306                                 if (serverIP == other->GetServerIP()) {
 307                                         if (serverPort == other->GetServerPort()) {
 308                                                 return other;
 309                                         }
 310                                 }
 311                         }
 312                 }
 313         } else if (userPort || userKadPort) {
 314                 // Check by IP first, then by ID
 315                 struct { const IDMap& map; uint32 value; } toCheck[] = {
 316                         { m_ipList, userIP }, { m_clientList, userID }
 317                 };
 318
 319                 for (size_t i = 0; i < itemsof(toCheck); ++i) {
 320                         if (toCheck[i].value == 0) {
 321                                 // We may not have both (or any) of these values.
 322                                 continue;
 323                         }
 324
 325                         IDMapIteratorPair range = toCheck[i].map.equal_range(toCheck[i].value);
 326
 327                         if (userPort) {
 328                                 IDMap::const_iterator it = range.first;
 329                                 for (; it != range.second; ++it) {
 330                                         if (userPort == it->second->GetUserPort()) {
 331                                                 return it->second;
 332                                         }
 333                                 }
 334                         }
 335
 336                         if (userKadPort) {
 337                                 IDMap::const_iterator it = range.first;
 338                                 for (; it != range.second; ++it) {
 339                                         if (userKadPort == it->second->GetKadPort()) {
 340                                                 return it->second;
 341                                         }
 342                                 }
 343                         }
 344                 }
 345         }
 346
 347
 348         // If anything else fails, then we look at hashes
 349         if ( client->HasValidHash() ) {
 350                 // Find all items with the specified hash
 351                 std::pair<HashMap::iterator, HashMap::iterator> range = m_hashList.equal_range( client->GetUserHash() );
 352
 353                 // Just return the first item if any
 354                 if ( range.first != range.second ) {
 355                         return range.first->second;
 356                 }
 357         }
 358
 359         // Nothing found, must be a new client
 360         return NULL;
 361 }
 362
 363
 364 uint32 CClientList::GetClientCount() const
 365 {
 366         return m_clientList.size();
 367 }
 368
 369
 370 void CClientList::DeleteAll()
 371 {
 372         m_ipList.clear();
 373         m_hashList.clear();
 374
 375         while ( !m_clientList.empty() ) {
 376                 IDMap::iterator it = m_clientList.begin();
 377
 378                 // Will call the removal of the item on this same class
 379                 it->second->Disconnected(wxT("Removed while deleting all from ClientList."));
 380                 it->second->Safe_Delete();
 381         }
 382
 383         // Clean up the clients now queued for deletion
 384 #ifdef __WXDEBUG__
 385         m_delete_queue_closed = true;
 386 #endif
 387         ProcessDeleteQueue();
 388 }
 389
 390
 391 bool CClientList::AttachToAlreadyKnown(CUpDownClient** client, CClientTCPSocket* sender)
 392 {
 393         CUpDownClient* tocheck = (*client);
 394
 395         CUpDownClient* found_client = FindMatchingClient( tocheck );
 396
 397         if ( tocheck == found_client ) {
 398                 // We found the same client instance (client may have sent more than one OP_HELLO). do not delete that client!
 399                 return true;
 400         }
 401
 402         if (found_client != NULL){
 403                 if (sender) {
 404                         if (found_client->GetSocket()) {
 405                                 if (found_client->IsConnected()
 406                                         && (found_client->GetIP() != tocheck->GetIP() || found_client->GetUserPort() != tocheck->GetUserPort() ) )
 407                                 {
 408                                         // if found_client is connected and has the IS_IDENTIFIED, it's safe to say that the other one is a bad guy
 409                                         if (found_client->IsIdentified()){
 410                                                 AddDebugLogLineM( false, logClient, wxT("Client: ") + tocheck->GetUserName() + wxT("(") + tocheck->GetFullIP() +  wxT("), Banreason: Userhash invalid"));
 411                                                 tocheck->Ban();
 412                                                 return false;
 413                                         }
 414
 415                                         AddDebugLogLineM( false, logClient, wxT("WARNING! Found matching client, to a currently connected client: ")
 416                                                                                                                         + tocheck->GetUserName() + wxT("(") +  tocheck->GetFullIP()
 417                                                                                                                         + wxT(") and ") + found_client->GetUserName() + wxT("(") +  found_client->GetFullIP() + wxT(")"));
 418                                         return false;
 419                                 }
 420                                 found_client->GetSocket()->Safe_Delete();
 421                         }
 422                         found_client->SetSocket( sender );
 423                         tocheck->SetSocket( NULL );
 424                 }
 425                 *client = 0;
 426                 tocheck->Safe_Delete();
 427                 *client = found_client;
 428                 return true;
 429         }
 430
 431         return false;
 432 }
 433
 434
 435 CUpDownClient* CClientList::FindClientByIP( uint32 clientip, uint16 port )
 436 {
 437         // Find all items with the specified ip
 438         std::pair<IDMap::iterator, IDMap::iterator> range = m_ipList.equal_range( clientip );
 439
 440         for ( ; range.first != range.second; ++range.first ) {
 441                 CUpDownClient* cur_client = range.first->second;
 442                 // Check if it's actually the client we want
 443                 if ( cur_client->GetUserPort() == port ) {
 444                         return cur_client;
 445                 }
 446         }
 447
 448         return NULL;
 449 }
 450
 451
 452 CUpDownClient* CClientList::FindClientByIP( uint32 clientip )
 453 {
 454         // Find all items with the specified ip
 455         std::pair<IDMap::iterator, IDMap::iterator> range = m_ipList.equal_range( clientip );
 456
 457         return (range.first != range.second) ? range.first->second : NULL;
 458 }
 459
 460
 461 bool CClientList::IsIPAlreadyKnown(uint32_t ip)
 462 {
 463         // Find all items with the specified ip
 464         std::pair<IDMap::iterator, IDMap::iterator> range = m_ipList.equal_range(ip);
 465         return range.first != range.second;
 466 }
 467
 468
 469 bool CClientList::ComparePriorUserhash(uint32 dwIP, uint16 nPort, void* pNewHash)
 470 {
 471         std::map<uint32, CDeletedClient*>::iterator it = m_trackedClientsList.find( dwIP );
 472
 473         if ( it != m_trackedClientsList.end() ) {
 474                 CDeletedClient* pResult = it->second;
 475
 476                 CDeletedClient::PaHList::iterator it2 = pResult->m_ItemsList.begin();
 477                 for ( ; it2 != pResult->m_ItemsList.end(); ++it2 ) {
 478                         if ( it2->nPort == nPort ) {
 479                                 if ( it2->pHash != pNewHash) {
 480                                         return false;
 481                                 } else {
 482                                         break;
 483                                 }
 484                         }
 485                 }
 486         }
 487         return true;
 488 }
 489
 490
 491 void CClientList::AddTrackClient(CUpDownClient* toadd)
 492 {
 493         std::map<uint32, CDeletedClient*>::iterator it = m_trackedClientsList.find( toadd->GetIP() );
 494
 495         if ( it != m_trackedClientsList.end() ) {
 496                 CDeletedClient* pResult = it->second;
 497
 498                 pResult->m_dwInserted = ::GetTickCount();
 499
 500                 CDeletedClient::PaHList::iterator it2 = pResult->m_ItemsList.begin();
 501                 for ( ; it2 != pResult->m_ItemsList.end(); ++it2 ) {
 502                         if ( it2->nPort == toadd->GetUserPort() ) {
 503                                 // already tracked, update
 504                                 it2->pHash = toadd->GetCreditsHash();
 505                                 return;
 506                         }
 507                 }
 508
 509                 // New client for that IP, add an entry
 510                 CDeletedClient::PortAndHash porthash = { toadd->GetUserPort(), toadd->GetCreditsHash()};
 511                 pResult->m_ItemsList.push_back(porthash);
 512         } else {
 513                 m_trackedClientsList[ toadd->GetIP() ] = new CDeletedClient(toadd);
 514         }
 515 }
 516
 517
 518 uint16 CClientList::GetClientsFromIP(uint32 dwIP)
 519 {
 520         std::map<uint32, CDeletedClient*>::iterator it = m_trackedClientsList.find( dwIP );
 521
 522         if ( it != m_trackedClientsList.end() ) {
 523                 return it->second->m_ItemsList.size();
 524         } else {
 525                 return 0;
 526         }
 527 }
 528
 529
 530 void CClientList::ProcessDeleteQueue()
 531 {
 532         // Delete pending clients
 533         while ( !m_delete_queue.empty() ) {
 534                 CUpDownClient* toremove = m_delete_queue.front();
 535                 m_delete_queue.pop_front();
 536
 537                 // Doing what RemoveClient used to do. Just to be sure...
 538                 theApp->uploadqueue->RemoveFromUploadQueue( toremove );
 539                 theApp->uploadqueue->RemoveFromWaitingQueue( toremove );
 540                 theApp->downloadqueue->RemoveSource( toremove );
 541
 542                 Notify_ClientCtrlRemoveClient( toremove );
 543
 544                 delete toremove;
 545         }
 546 }
 547
 548
 549 void CClientList::Process()
 550 {
 551         const uint32 cur_tick = ::GetTickCount();
 552
 553         ProcessDeleteQueue();
 554
 555         if (m_dwLastBannCleanUp + BAN_CLEANUP_TIME < cur_tick) {
 556                 m_dwLastBannCleanUp = cur_tick;
 557
 558                 ClientMap::iterator it = m_bannedList.begin();
 559                 while ( it != m_bannedList.end() ) {
 560                         if ( it->second + CLIENTBANTIME < cur_tick ) {
 561                                 ClientMap::iterator tmp = it++;
 562
 563                                 m_bannedList.erase( tmp );
 564                                 theStats::RemoveBannedClient();
 565                         } else {
 566                                 ++it;
 567                         }
 568                 }
 569         }
 570
 571
 572         if ( m_dwLastTrackedCleanUp + TRACKED_CLEANUP_TIME < cur_tick ) {
 573                 m_dwLastTrackedCleanUp = cur_tick;
 574
 575                 std::map<uint32, CDeletedClient*>::iterator it = m_trackedClientsList.begin();
 576                 while ( it != m_trackedClientsList.end() ) {
 577                         std::map<uint32, CDeletedClient*>::iterator cur_src = it++;
 578
 579                         if ( cur_src->second->m_dwInserted + KEEPTRACK_TIME < cur_tick ) {
 580                                 delete cur_src->second;
 581                                 m_trackedClientsList.erase( cur_src );
 582                         }
 583                 }
 584         }
 585
 586         //We need to try to connect to the clients in m_KadList
 587         //If connected, remove them from the list and send a message back to Kad so we can send a ACK.
 588         //If we don't connect, we need to remove the client..
 589         //The sockets timeout should delete this object.
 590
 591         // buddy is just a flag that is used to make sure we are still connected or connecting to a buddy.
 592         buddyState buddy = Disconnected;
 593
 594         std::set<CUpDownClient*>::iterator current_it = m_KadSources.begin();
 595         while (current_it != m_KadSources.end()) {
 596                 CUpDownClient* cur_client = *current_it;
 597                 ++current_it; // Won't be used anymore till while loop
 598                 if( !Kademlia::CKademlia::IsRunning() ) {
 599                         //Clear out this list if we stop running Kad.
 600                         //Setting the Kad state to KS_NONE causes it to be removed in the switch below.
 601                         cur_client->SetKadState(KS_NONE);
 602                 }
 603                 switch (cur_client->GetKadState()) {
 604                         case KS_QUEUED_FWCHECK:
 605                         case KS_QUEUED_FWCHECK_UDP:
 606                                 //Another client asked us to try to connect to them to check their firewalled status.
 607                                 cur_client->TryToConnect(true);
 608                                 break;
 609
 610                         case KS_CONNECTING_FWCHECK:
 611                                 //Ignore this state as we are just waiting for results.
 612                                 break;
 613
 614                         case KS_FWCHECK_UDP:
 615                         case KS_CONNECTING_FWCHECK_UDP:
 616                                 // We want a UDP firewallcheck from this client and are just waiting to get connected to send the request
 617                                 break;
 618
 619                         case KS_CONNECTED_FWCHECK:
 620                                 //We successfully connected to the client.
 621                                 //We now send a ack to let them know.
 622                                 if (cur_client->GetKadVersion() >= 7) {
 623                                         // The result is now sent per TCP instead of UDP, because this will fail if our intern port is unreachable.
 624                                         // But we want the TCP testresult regardless if UDP is firewalled, the new UDP state and test takes care of the rest
 625                                         wxASSERT(cur_client->IsConnected());
 626                                         //AddDebugLogLineM(false, logClient, wxT("Sent OP_KAD_FWTCPCHECK_ACK"));
 627                                         CPacket *packet = new CPacket(OP_KAD_FWTCPCHECK_ACK, 0, OP_EMULEPROT);
 628                                         cur_client->SafeSendPacket(packet);
 629                                 } else {
 630                                         DebugSend(KadFirewalledAckRes, wxUINT32_SWAP_ALWAYS(cur_client->GetIP()), cur_client->GetKadPort());
 631                                         Kademlia::CKademlia::GetUDPListener()->SendNullPacket(KADEMLIA_FIREWALLED_ACK_RES, wxUINT32_SWAP_ALWAYS(cur_client->GetIP()), cur_client->GetKadPort(), 0, NULL);
 632                                 }
 633                                 //We are done with this client. Set Kad status to KS_NONE and it will be removed in the next cycle.
 634                                 cur_client->SetKadState(KS_NONE);
 635                                 break;
 636
 637                         case KS_INCOMING_BUDDY:
 638                                 //A firewalled client wants us to be his buddy.
 639                                 //If we already have a buddy, we set Kad state to KS_NONE and it's removed in the next cycle.
 640                                 //If not, this client will change to KS_CONNECTED_BUDDY when it connects.
 641                                 if( m_nBuddyStatus == Connected ) {
 642                                         cur_client->SetKadState(KS_NONE);
 643                                 }
 644                                 break;
 645
 646                         case KS_QUEUED_BUDDY:
 647                                 //We are firewalled and want to request this client to be a buddy.
 648                                 //But first we check to make sure we are not already trying another client.
 649                                 //If we are not already trying. We try to connect to this client.
 650                                 //If we are already connected to a buddy, we set this client to KS_NONE and it's removed next cycle.
 651                                 //If we are trying to connect to a buddy, we just ignore as the one we are trying may fail and we can then try this one.
 652                                 if( m_nBuddyStatus == Disconnected ) {
 653                                         buddy = Connecting;
 654                                         m_nBuddyStatus = Connecting;
 655                                         cur_client->SetKadState(KS_CONNECTING_BUDDY);
 656                                         cur_client->TryToConnect(true);
 657                                         Notify_ServerUpdateED2KInfo();
 658                                 } else {
 659                                         if( m_nBuddyStatus == Connected ) {
 660                                                 cur_client->SetKadState(KS_NONE);
 661                                         }
 662                                 }
 663                                 break;
 664
 665                         case KS_CONNECTING_BUDDY:
 666                                 //We are trying to connect to this client.
 667                                 //Although it should NOT happen, we make sure we are not already connected to a buddy.
 668                                 //If we are we set to KS_NONE and it's removed next cycle.
 669                                 //But if we are not already connected, make sure we set the flag to connecting so we know
 670                                 //things are working correctly.
 671                                 if( m_nBuddyStatus == Connected ) {
 672                                         cur_client->SetKadState(KS_NONE);
 673                                 } else {
 674                                         wxASSERT( m_nBuddyStatus == Connecting );
 675                                         buddy = Connecting;
 676                                 }
 677                                 break;
 678
 679                         case KS_CONNECTED_BUDDY:
 680                                 //A potential connected buddy client wanting to me in the Kad network
 681                                 //We set our flag to connected to make sure things are still working correctly.
 682                                 buddy = Connected;
 683
 684                                 //If m_nBuddyStatus is not connected already, we set this client as our buddy!
 685                                 if( m_nBuddyStatus != Connected ) {
 686                                         m_pBuddy = cur_client;
 687                                         m_nBuddyStatus = Connected;
 688                                         Notify_ServerUpdateED2KInfo();
 689                                 }
 690                                 if( m_pBuddy == cur_client && theApp->IsFirewalled() && cur_client->SendBuddyPingPong() ) {
 691                                         cur_client->SendBuddyPing();
 692                                 }
 693                                 break;
 694
 695                         default:
 696                                 RemoveFromKadList(cur_client);
 697                 }
 698         }
 699
 700         //We either never had a buddy, or lost our buddy..
 701         if( buddy == Disconnected ) {
 702                 if( m_nBuddyStatus != Disconnected || m_pBuddy ) {
 703                         if( Kademlia::CKademlia::IsRunning() && theApp->IsFirewalled() && Kademlia::CUDPFirewallTester::IsFirewalledUDP(true) ) {
 704                                 //We are a lowID client and we just lost our buddy.
 705                                 //Go ahead and instantly try to find a new buddy.
 706                                 Kademlia::CKademlia::GetPrefs()->SetFindBuddy();
 707                         }
 708                         m_pBuddy = NULL;
 709                         m_nBuddyStatus = Disconnected;
 710                         Notify_ServerUpdateED2KInfo();
 711                 }
 712         }
 713
 714         if ( Kademlia::CKademlia::IsConnected() ) {
 715                 // we only need a buddy if direct callback is not available
 716                 if(Kademlia::CKademlia::IsFirewalled() && Kademlia::CUDPFirewallTester::IsFirewalledUDP(true)) {
 717                         // TODO: Kad buddies won't work with RequireCrypt, so it is disabled for now, but should (and will)
 718                         // be fixed in later version
 719                         // Update: buddy connections themselves support obfuscation properly since eMule 0.49a and aMule SVN 2008-05-09
 720                         // (this makes it work fine if our buddy uses require crypt), however callback requests don't support it yet so we
 721                         // wouldn't be able to answer callback requests with RequireCrypt, protocolchange intended for eMule 0.49b
 722                         if(m_nBuddyStatus == Disconnected && Kademlia::CKademlia::GetPrefs()->GetFindBuddy() && !thePrefs::IsClientCryptLayerRequired()) {
 723                                 AddDebugLogLineM(false, logKadMain, wxT("Starting BuddySearch"));
 724                                 //We are a firewalled client with no buddy. We have also waited a set time
 725                                 //to try to avoid a false firewalled status.. So lets look for a buddy..
 726                                 if (!Kademlia::CSearchManager::PrepareLookup(Kademlia::CSearch::FINDBUDDY, true, Kademlia::CUInt128(true).XOR(Kademlia::CKademlia::GetPrefs()->GetKadID()))) {
 727                                         //This search ID was already going. Most likely reason is that
 728                                         //we found and lost our buddy very quickly and the last search hadn't
 729                                         //had time to be removed yet. Go ahead and set this to happen again
 730                                         //next time around.
 731                                         Kademlia::CKademlia::GetPrefs()->SetFindBuddy();
 732                                 }
 733                         }
 734                 } else {
 735                         if( m_pBuddy ) {
 736                                 //Lets make sure that if we have a buddy, they are firewalled!
 737                                 //If they are also not firewalled, then someone must have fixed their firewall or stopped saturating their line..
 738                                 //We just set the state of this buddy to KS_NONE and things will be cleared up with the next cycle.
 739                                 if( !m_pBuddy->HasLowID() ) {
 740                                         m_pBuddy->SetKadState(KS_NONE);
 741                                 }
 742                         }
 743                 }
 744         } else {
 745                 if( m_pBuddy ) {
 746                         //We are not connected anymore. Just set this buddy to KS_NONE and things will be cleared out on next cycle.
 747                         m_pBuddy->SetKadState(KS_NONE);
 748                 }
 749         }
 750
 751         CleanUpClientList();
 752         ProcessDirectCallbackList();
 753 }
 754
 755
 756 void CClientList::AddBannedClient(uint32 dwIP)
 757 {
 758         m_bannedList[dwIP] = ::GetTickCount();
 759         theStats::AddBannedClient();
 760 }
 761
 762
 763 bool CClientList::IsBannedClient(uint32 dwIP)
 764 {
 765         ClientMap::iterator it = m_bannedList.find( dwIP );
 766
 767         if ( it != m_bannedList.end() ) {
 768                 if ( it->second + CLIENTBANTIME > ::GetTickCount() ) {
 769                         return true;
 770                 } else {
 771                         RemoveBannedClient(dwIP);
 772                 }
 773         }
 774         return false;
 775 }
 776
 777
 778 void CClientList::RemoveBannedClient(uint32 dwIP)
 779 {
 780         m_bannedList.erase(dwIP);
 781         theStats::RemoveBannedClient();
 782 }
 783
 784
 785 void CClientList::FilterQueues()
 786 {
 787         // Filter client list
 788         for ( IDMap::iterator it = m_ipList.begin(); it != m_ipList.end(); ) {
 789                 IDMap::iterator tmp = it++; // Don't change this to a ++it!
 790
 791                 if ( theApp->ipfilter->IsFiltered(tmp->second->GetConnectIP())) {
 792                         tmp->second->Disconnected(wxT("Filtered by IPFilter"));
 793                         tmp->second->Safe_Delete();
 794                 }
 795         }
 796 }
 797
 798
 799 CClientList::SourceList CClientList::GetClientsByHash( const CMD4Hash& hash )
 800 {
 801         SourceList results;
 802
 803         // Find all items with the specified hash
 804         std::pair<HashMap::iterator, HashMap::iterator> range = m_hashList.equal_range( hash );
 805
 806         for ( ; range.first != range.second; ++range.first)  {
 807                 results.push_back( range.first->second );
 808         }
 809
 810         return results;
 811 }
 812
 813
 814 CClientList::SourceList CClientList::GetClientsByIP( unsigned long ip )
 815 {
 816         SourceList results;
 817
 818         // Find all items with the specified hash
 819         std::pair<IDMap::iterator, IDMap::iterator> range = m_ipList.equal_range( ip );
 820
 821         for ( ; range.first != range.second; range.first++ )  {
 822                 results.push_back( range.first->second );
 823         }
 824
 825         return results;
 826 }
 827
 828
 829 const CClientList::IDMap& CClientList::GetClientList()
 830 {
 831         return m_clientList;
 832 }
 833
 834
 835 void CClientList::AddDeadSource(const CUpDownClient* client)
 836 {
 837         m_deadSources.AddDeadSource( client );
 838 }
 839
 840
 841 bool CClientList::IsDeadSource(const CUpDownClient* client)
 842 {
 843         return m_deadSources.IsDeadSource( client );
 844 }
 845
 846 bool CClientList::SendChatMessage(uint64 client_id, const wxString& message)
 847 {
 848         CUpDownClient* client = FindClientByIP(IP_FROM_GUI_ID(client_id), PORT_FROM_GUI_ID(client_id));
 849         AddDebugLogLineM( false, logClient, wxT("Trying to Send Message.") );
 850         if (client) {
 851                 AddDebugLogLineM( false, logClient, wxT("Sending.") );
 852         } else {
 853                 AddDebugLogLineM( true, logClient,
 854                         CFormat( wxT("No client (GUI_ID %lli [%s:%llu]) found in CClientList::SendChatMessage(). Creating") )
 855                                 % client_id
 856                                 % Uint32toStringIP(IP_FROM_GUI_ID(client_id))
 857                                 % PORT_FROM_GUI_ID(client_id) );
 858                 client = new CUpDownClient(PORT_FROM_GUI_ID(client_id),IP_FROM_GUI_ID(client_id),0,0,NULL, true, true);
 859                 AddClient(client);
 860         }
 861         return client->SendChatMessage(message);
 862 }
 863
 864 void CClientList::SetChatState(uint64 client_id, uint8 state) {
 865         CUpDownClient* client = FindClientByIP(IP_FROM_GUI_ID(client_id), PORT_FROM_GUI_ID(client_id));
 866         if (client) {
 867                 client->SetChatState(state);
 868         }
 869 }
 870
 871 /* Kad stuff */
 872
 873 bool CClientList::RequestTCP(Kademlia::CContact* contact, uint8_t connectOptions)
 874 {
 875         uint32_t nContactIP = wxUINT32_SWAP_ALWAYS(contact->GetIPAddress());
 876         // don't connect ourself
 877         if (theApp->GetPublicIP() == nContactIP && thePrefs::GetPort() == contact->GetTCPPort()) {
 878                 return false;
 879         }
 880
 881         CUpDownClient* pNewClient = FindClientByIP(nContactIP, contact->GetTCPPort());
 882
 883         if (!pNewClient) {
 884                 //#warning Do we actually have to check friendstate here?
 885                 pNewClient = new CUpDownClient(contact->GetTCPPort(), contact->GetIPAddress(), 0, 0, NULL, false, true);
 886         } else if (pNewClient->GetKadState() != KS_NONE) {
 887                 return false; // already busy with this client in some way (probably buddy stuff), don't mess with it
 888         }
 889
 890         //Add client to the lists to be processed.
 891         pNewClient->SetKadPort(contact->GetUDPPort());
 892         pNewClient->SetKadState(KS_QUEUED_FWCHECK);
 893         if (contact->GetClientID() != 0) {
 894                 uint8_t ID[16];
 895                 contact->GetClientID().ToByteArray(ID);
 896                 pNewClient->SetUserHash(CMD4Hash(ID));
 897                 pNewClient->SetConnectOptions(connectOptions, true, false);
 898         }
 899         AddToKadList(pNewClient); // This was a direct adding, but I like to check duplicates
 900         //This method checks if this is a dup already.
 901         AddClient(pNewClient);
 902         return true;
 903 }
 904
 905 void CClientList::RequestBuddy(Kademlia::CContact* contact, uint8_t connectOptions)
 906 {
 907         uint32_t nContactIP = wxUINT32_SWAP_ALWAYS(contact->GetIPAddress());
 908         // Don't connect to ourself
 909         if (theApp->GetPublicIP() == nContactIP && thePrefs::GetPort() == contact->GetTCPPort()) {
 910                 return;
 911         }
 912
 913         CUpDownClient* pNewClient = FindClientByIP(nContactIP, contact->GetTCPPort());
 914         if (!pNewClient) {
 915                 pNewClient = new CUpDownClient(contact->GetTCPPort(), contact->GetIPAddress(), 0, 0, NULL, false, true );
 916         } else if (pNewClient->GetKadState() != KS_NONE) {
 917                 return; // already busy with this client in some way (probably fw stuff), don't mess with it
 918         } else if (IsKadFirewallCheckIP(nContactIP)) { // doing a kad firewall check with this IP, abort
 919                 AddDebugLogLineM(false, logKadMain, wxT("Kad TCP firewallcheck / Buddy request collision for IP ") + Uint32toStringIP(nContactIP));
 920                 return;
 921         }
 922
 923         //Add client to the lists to be processed.
 924         pNewClient->SetKadPort(contact->GetUDPPort());
 925         pNewClient->SetKadState(KS_QUEUED_BUDDY);
 926         uint8_t ID[16];
 927         contact->GetClientID().ToByteArray(ID);
 928         pNewClient->SetUserHash(CMD4Hash(ID));
 929         pNewClient->SetConnectOptions(connectOptions, true, false);
 930         AddToKadList(pNewClient);
 931         //This method checks if this is a dup already.
 932         AddClient(pNewClient);
 933 }
 934
 935 bool CClientList::IncomingBuddy(Kademlia::CContact* contact, Kademlia::CUInt128* buddyID)
 936 {
 937         uint32_t nContactIP = wxUINT32_SWAP_ALWAYS(contact->GetIPAddress());
 938         //If aMule already knows this client, abort this.. It could cause conflicts.
 939         //Although the odds of this happening is very small, it could still happen.
 940         if (FindClientByIP(nContactIP, contact->GetTCPPort())) {
 941                 return false;
 942         } else if (IsKadFirewallCheckIP(nContactIP)) { // doing a kad firewall check with this IP, abort
 943                 AddDebugLogLineM(false, logKadMain, wxT("Kad TCP firewallcheck / Buddy request collision for IP ") + Uint32toStringIP(nContactIP));
 944                 return false;
 945         }
 946
 947         if (theApp->GetPublicIP() == nContactIP && thePrefs::GetPort() == contact->GetTCPPort()) {
 948                 return false; // don't connect ourself
 949         }
 950
 951         //Add client to the lists to be processed.
 952         CUpDownClient* pNewClient = new CUpDownClient(contact->GetTCPPort(), contact->GetIPAddress(), 0, 0, NULL, false, true );
 953         pNewClient->SetKadPort(contact->GetUDPPort());
 954         pNewClient->SetKadState(KS_INCOMING_BUDDY);
 955         byte ID[16];
 956         contact->GetClientID().ToByteArray(ID);
 957         pNewClient->SetUserHash(CMD4Hash(ID));
 958         buddyID->ToByteArray(ID);
 959         pNewClient->SetBuddyID(ID);
 960         AddToKadList(pNewClient);
 961         AddClient(pNewClient);
 962         return true;
 963 }
 964
 965 void CClientList::RemoveFromKadList(CUpDownClient* torem)
 966 {
 967         wxCHECK_RET(torem, wxT("NULL pointer in RemoveFromKadList"));
 968
 969         if (m_KadSources.erase(torem)) {
 970                 if(torem == m_pBuddy) {
 971                         m_pBuddy = NULL;
 972                         m_nBuddyStatus = Disconnected;
 973                         Notify_ServerUpdateED2KInfo();
 974                 }
 975         }
 976 }
 977
 978 void CClientList::AddToKadList(CUpDownClient* toadd)
 979 {
 980         wxCHECK_RET(toadd, wxT("NULL pointer in AddToKadList"));
 981
 982         m_KadSources.insert(toadd); // This will take care of duplicates.
 983 }
 984
 985 bool CClientList::DoRequestFirewallCheckUDP(const Kademlia::CContact& contact)
 986 {
 987         // first make sure we don't know this IP already from somewhere
 988         if (IsIPAlreadyKnown(wxUINT32_SWAP_ALWAYS(contact.GetIPAddress()))) {
 989                 return false;
 990         }
 991         // fine, just create the client object, set the state and wait
 992         // TODO: We don't know the client's userhash, this means we cannot build an obfuscated connection, which
 993         // again mean that the whole check won't work on "Require Obfuscation" setting, which is not a huge problem,
 994         // but certainly not nice. Only somewhat acceptable way to solve this is to use the KadID instead.
 995         CUpDownClient* pNewClient = new CUpDownClient(contact.GetTCPPort(), contact.GetIPAddress(), 0, 0, NULL, false, true);
 996         pNewClient->SetKadState(KS_QUEUED_FWCHECK_UDP);
 997         AddDebugLogLineM(false, logClient, wxT("Selected client for UDP Firewallcheck: ") + Uint32toStringIP(wxUINT32_SWAP_ALWAYS(contact.GetIPAddress())));
 998         AddToKadList(pNewClient);
 999         AddClient(pNewClient);
1000         wxASSERT(!pNewClient->SupportsDirectUDPCallback());
1001         return true;
1002 }
1003
1004 void CClientList::CleanUpClientList()
1005 {
1006         // We remove clients which are not needed any more by time
1007         // this check is also done on CUpDownClient::Disconnected, however it will not catch all
1008         // cases (if a client changes the state without beeing connected
1009         //
1010         // Adding this check directly to every point where any state changes would be more effective,
1011         // is however not compatible with the current code, because there are points where a client has
1012         // no state for some code lines and the code is also not prepared that a client object gets
1013         // invalid while working with it (aka setting a new state)
1014         // so this way is just the easy and safe one to go (as long as amule is basically single threaded)
1015         const uint32 cur_tick = ::GetTickCount();
1016         if (m_dwLastClientCleanUp + CLIENTLIST_CLEANUP_TIME < cur_tick ){
1017                 m_dwLastClientCleanUp = cur_tick;
1018                 uint32 cDeleted = 0;
1019                 IDMap::iterator current_it = m_clientList.begin();
1020                 while (current_it != m_clientList.end()) {
1021                         CUpDownClient* pCurClient = current_it->second;
1022                         ++current_it; // Won't be used till while loop again
1023                         // Don't delete sources coming from source seeds for 10 mins,
1024                         // to give them a chance to connect and become a useful source.
1025                         if (pCurClient->GetSourceFrom() == SF_SOURCE_SEEDS && cur_tick - (uint32)theStats::GetStartTime() < MIN2MS(10)) continue;
1026                         if ((pCurClient->GetUploadState() == US_NONE || (pCurClient->GetUploadState() == US_BANNED && !pCurClient->IsBanned()))
1027                                 && pCurClient->GetDownloadState() == DS_NONE
1028                                 && pCurClient->GetChatState() == MS_NONE
1029                                 && pCurClient->GetKadState() == KS_NONE
1030                                 && pCurClient->GetSocket() == NULL)
1031                         {
1032                                 cDeleted++;
1033                                 pCurClient->Disconnected(wxT("Removed during ClientList cleanup."));
1034                                 pCurClient->Safe_Delete();
1035                         } else {
1036                                 if (!(pCurClient->GetUploadState() == US_NONE || (pCurClient->GetUploadState() == US_BANNED && !pCurClient->IsBanned()))) {
1037                                         AddDebugLogLineM(false, logProxy,
1038                                                 CFormat(wxT("Debug: Not deleted client %x with up state: %i "))
1039                                                         % (long int)pCurClient % pCurClient->GetUploadState());
1040                                 }
1041                                 if (!(pCurClient->GetDownloadState() == DS_NONE)) {
1042                                         AddDebugLogLineM(false, logProxy,
1043                                                 CFormat(wxT("Debug: Not deleted client %x with down state: %i "))
1044                                                         % (long int)pCurClient % pCurClient->GetDownloadState());
1045                                 }
1046                                 if (!(pCurClient->GetChatState() == MS_NONE)) {
1047                                         AddDebugLogLineM(false, logProxy,
1048                                                 CFormat(wxT("Debug: Not deleted client %x with chat state: %i "))
1049                                                         % (long int)pCurClient % pCurClient->GetChatState());
1050                                 }
1051                                 if (!(pCurClient->GetKadState() == KS_NONE)) {
1052                                         AddDebugLogLineM(false, logProxy,
1053                                                 CFormat(wxT("Debug: Not deleted client %x with kad state: %i ip: %s"))
1054                                                         % (long int)pCurClient % pCurClient->GetKadState() % pCurClient->GetFullIP());
1055                                 }
1056                                 if (!(pCurClient->GetSocket() == NULL)) {
1057                                         AddDebugLogLineM(false, logProxy,
1058                                                 CFormat(wxT("Debug: Not deleted client %x: has socket")) % (long int)pCurClient);
1059                                 }
1060                                 AddDebugLogLineM(false, logProxy,
1061                                         CFormat(wxT("Debug: Not deleted client %x with kad version: %i"))
1062                                                 % (long int)pCurClient % pCurClient->GetKadVersion());
1063                         }
1064                 }
1065                 AddDebugLogLineM(false, logClient, wxString::Format(wxT("Cleaned ClientList, removed %i not used known clients"), cDeleted));
1066         }
1067 }
1068
1069 void CClientList::AddKadFirewallRequest(uint32 ip)
1070 {
1071         uint32 ticks = ::GetTickCount();
1072         IpAndTicks add = { ip, ticks };
1073         m_firewallCheckRequests.push_front(add);
1074         while (!m_firewallCheckRequests.empty()) {
1075                 if (ticks - m_firewallCheckRequests.back().inserted > SEC2MS(180)) {
1076                         m_firewallCheckRequests.pop_back();
1077                 } else {
1078                         break;
1079                 }
1080         }
1081 }
1082
1083 bool CClientList::IsKadFirewallCheckIP(uint32 ip) const
1084 {
1085         uint32 ticks = ::GetTickCount();
1086         for (IpAndTicksList::const_iterator it = m_firewallCheckRequests.begin(); it != m_firewallCheckRequests.end(); ++it) {
1087                 if (it->ip == ip && ticks - it->inserted < SEC2MS(180)) {
1088                         return true;
1089                 }
1090         }
1091         return false;
1092 }
1093
1094 void CClientList::AddDirectCallbackClient(CUpDownClient* toAdd)
1095 {
1096         wxASSERT(toAdd->GetDirectCallbackTimeout() != 0);
1097         if (toAdd->HasBeenDeleted()) {
1098                 return;
1099         }
1100         for (DirectCallbackList::const_iterator it = m_currentDirectCallbacks.begin(); it != m_currentDirectCallbacks.end(); ++it) {
1101                 if (*it == toAdd) {
1102                         wxFAIL; // might happen very rarely on multiple connection tries, could be fixed in the client class, till then it's not much of a problem though
1103                         return;
1104                 }
1105         }
1106         m_currentDirectCallbacks.push_back(toAdd);
1107 }
1108
1109 void CClientList::ProcessDirectCallbackList()
1110 {
1111         // we do check if any direct callbacks have timed out by now
1112         const uint32_t cur_tick = ::GetTickCount();
1113         for (DirectCallbackList::iterator it = m_currentDirectCallbacks.begin(); it != m_currentDirectCallbacks.end();) {
1114                 DirectCallbackList::iterator it2 = it++;
1115                 CUpDownClient* curClient = *it2;
1116                 if (curClient->GetDirectCallbackTimeout() < cur_tick) {
1117                         wxASSERT(curClient->GetDirectCallbackTimeout() != 0);
1118                         // TODO LOGREMOVE
1119                         //DebugLog(_T("DirectCallback timed out (%s)"), pCurClient->DbgGetClientInfo());
1120                         m_currentDirectCallbacks.erase(it2);
1121                         if (curClient->Disconnected(wxT("Direct Callback Timeout"))) {
1122                                 curClient->Safe_Delete();
1123                         }
1124                 }
1125         }
1126 }
1127
1128 void CClientList::AddTrackCallbackRequests(uint32_t ip)
1129 {
1130         uint32_t now = ::GetTickCount();
1131         IpAndTicks add = { ip, now };
1132         m_directCallbackRequests.push_front(add);
1133         while (!m_directCallbackRequests.empty()) {
1134                 if (now - m_directCallbackRequests.back().inserted > MIN2MS(3)) {
1135                         m_directCallbackRequests.pop_back();
1136                 } else {
1137                         break;
1138                 }
1139         }
1140 }
1141
1142 bool CClientList::AllowCallbackRequest(uint32_t ip) const
1143 {
1144         uint32_t now = ::GetTickCount();
1145         for (IpAndTicksList::const_iterator it = m_directCallbackRequests.begin(); it != m_directCallbackRequests.end(); ++it) {
1146                 if (it->ip == ip && now - it->inserted < MIN2MS(3)) {
1147                         return false;
1148                 }
1149         }
1150         return true;
1151 }
1152 // File_checked_for_headers