Modules/IPStack/tcp.c

   1 /*
   2  * Acess2 IP Stack
   3  * - TCP Handling
   4  */
   5 #include "ipstack.h"
   6 #include "ipv4.h"
   7 #include "tcp.h"
   8
   9 #define TCP_MIN_DYNPORT 0xC000
  10 #define TCP_MAX_HALFOPEN        1024    // Should be enough
  11
  12 // === PROTOTYPES ===
  13 void    TCP_Initialise();
  14 void    TCP_StartConnection(tTCPConnection *Conn);
  15 void    TCP_SendPacket(tTCPConnection *Conn, size_t Length, tTCPHeader *Data);
  16 void    TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer);
  17 void    TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header, int Length);
  18 void    TCP_INT_AppendRecieved(tTCPConnection *Connection, tTCPStoredPacket *Ptk);
  19 void    TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection);
  20 Uint16  TCP_GetUnusedPort();
  21  int    TCP_AllocatePort(Uint16 Port);
  22  int    TCP_DeallocatePort(Uint16 Port);
  23 // --- Server
  24 tVFS_Node       *TCP_Server_Init(tInterface *Interface);
  25 char    *TCP_Server_ReadDir(tVFS_Node *Node, int Pos);
  26 tVFS_Node       *TCP_Server_FindDir(tVFS_Node *Node, char *Name);
  27  int    TCP_Server_IOCtl(tVFS_Node *Node, int ID, void *Data);
  28 void    TCP_Server_Close(tVFS_Node *Node);
  29 // --- Client
  30 tVFS_Node       *TCP_Client_Init(tInterface *Interface);
  31 Uint64  TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  32 Uint64  TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
  33  int    TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data);
  34 void    TCP_Client_Close(tVFS_Node *Node);
  35
  36 // === TEMPLATES ===
  37 tSocketFile     gTCP_ServerFile = {NULL, "tcps", TCP_Server_Init};
  38 tSocketFile     gTCP_ClientFile = {NULL, "tcpc", TCP_Client_Init};
  39
  40 // === GLOBALS ===
  41  int    giTCP_NumHalfopen = 0;
  42 tSpinlock       glTCP_Listeners;
  43 tTCPListener    *gTCP_Listeners;
  44 tSpinlock       glTCP_OutbountCons;
  45 tTCPConnection  *gTCP_OutbountCons;
  46 Uint32  gaTCP_PortBitmap[0x800];
  47  int    giTCP_NextOutPort = TCP_MIN_DYNPORT;
  48
  49 // === CODE ===
  50 /**
  51  * \fn void TCP_Initialise()
  52  * \brief Initialise the TCP Layer
  53  */
  54 void TCP_Initialise()
  55 {
  56         IPStack_AddFile(&gTCP_ServerFile);
  57         IPStack_AddFile(&gTCP_ClientFile);
  58         IPv4_RegisterCallback(IP4PROT_TCP, TCP_GetPacket);
  59 }
  60
  61 /**
  62  * \brief Open a connection to another host using TCP
  63  */
  64 void TCP_StartConnection(tTCPConnection *Conn)
  65 {
  66         tTCPHeader      hdr;
  67
  68         hdr.SourcePort = Conn->LocalPort;
  69         hdr.DestPort = Conn->RemotePort;
  70         Conn->NextSequenceSend = rand();
  71         hdr.SequenceNumber = Conn->NextSequenceSend;
  72         hdr.DataOffset = (sizeof(tTCPHeader)/4) << 4;
  73         hdr.Flags = TCP_FLAG_SYN;
  74         hdr.WindowSize = 0;     // TODO
  75         hdr.Checksum = 0;       // TODO
  76         hdr.UrgentPointer = 0;
  77         // SEND PACKET
  78         TCP_SendPacket( Conn, sizeof(tTCPHeader), &hdr );
  79         return ;
  80 }
  81
  82 /**
  83  * \brief Sends a packet from the specified connection, calculating the checksums
  84  * \param Conn  Connection
  85  * \param Length        Length of data
  86  * \param Data  Packet data
  87  */
  88 void TCP_SendPacket( tTCPConnection *Conn, size_t Length, tTCPHeader *Data )
  89 {
  90         size_t  buflen;
  91         Uint32  *buf;
  92         switch( Conn->Interface->Type )
  93         {
  94         case 4: // Append IPv4 Pseudo Header
  95                 buflen = 4 + 4 + 4 + ((Length+1)&~1);
  96                 buf = malloc( buflen );
  97                 buf[0] = Conn->Interface->IP4.Address.L;
  98                 buf[1] = Conn->RemoteIP.v4.L;
  99                 buf[2] = (htons(Length)<<16) | (6<<8) | 0;
 100                 Data->Checksum = 0;
 101                 memcpy( &buf[3], Data, Length );
 102                 Data->Checksum = IPv4_Checksum( buf, buflen );
 103                 free(buf);
 104                 IPv4_SendPacket(Conn->Interface, Conn->RemoteIP.v4, IP4PROT_TCP, 0, Length, Data);
 105                 break;
 106         }
 107 }
 108
 109 /**
 110  * \fn void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
 111  * \brief Handles a packet from the IP Layer
 112  */
 113 void TCP_GetPacket(tInterface *Interface, void *Address, int Length, void *Buffer)
 114 {
 115         tTCPHeader      *hdr = Buffer;
 116         tTCPListener    *srv;
 117         tTCPConnection  *conn;
 118
 119         Log("[TCP  ] SourcePort = %i, DestPort = %i",
 120                 ntohs(hdr->SourcePort), ntohs(hdr->DestPort));
 121         Log("[TCP  ] SequenceNumber = 0x%x", ntohl(hdr->SequenceNumber));
 122         Log("[TCP  ] AcknowlegementNumber = 0x%x", ntohl(hdr->AcknowlegementNumber));
 123         Log("[TCP  ] DataOffset = %i", hdr->DataOffset >> 4);
 124         Log("[TCP  ] Flags = {");
 125         Log("[TCP  ]   CWR = %B, ECE = %B",
 126                 !!(hdr->Flags & TCP_FLAG_CWR), !!(hdr->Flags & TCP_FLAG_ECE));
 127         Log("[TCP  ]   URG = %B, ACK = %B",
 128                 !!(hdr->Flags & TCP_FLAG_URG), !!(hdr->Flags & TCP_FLAG_ACK));
 129         Log("[TCP  ]   PSH = %B, RST = %B",
 130                 !!(hdr->Flags & TCP_FLAG_PSH), !!(hdr->Flags & TCP_FLAG_RST));
 131         Log("[TCP  ]   SYN = %B, FIN = %B",
 132                 !!(hdr->Flags & TCP_FLAG_SYN), !!(hdr->Flags & TCP_FLAG_FIN));
 133         Log("[TCP  ] }");
 134         Log("[TCP  ] WindowSize = %i", htons(hdr->WindowSize));
 135         Log("[TCP  ] Checksum = 0x%x", htons(hdr->Checksum));
 136         Log("[TCP  ] UrgentPointer = 0x%x", htons(hdr->UrgentPointer));
 137
 138         if( Length > (hdr->DataOffset >> 4)*4 )
 139         {
 140                 Debug_HexDump(
 141                         "[TCP  ] Packet Data = ",
 142                         (Uint8*)hdr + (hdr->DataOffset >> 4)*4,
 143                         Length - (hdr->DataOffset >> 4)*4
 144                         );
 145         }
 146
 147         // Check Servers
 148         {
 149                 for( srv = gTCP_Listeners; srv; srv = srv->Next )
 150                 {
 151                         // Check if the server is active
 152                         if(srv->Port == 0)      continue;
 153                         // Check the interface
 154                         if(srv->Interface && srv->Interface != Interface)       continue;
 155                         // Check the destination port
 156                         if(srv->Port != htons(hdr->DestPort))   continue;
 157
 158                         Log("[TCP  ] Matches server %p", srv);
 159                         // Is this in an established connection?
 160                         for( conn = srv->Connections; conn; conn = conn->Next )
 161                         {
 162                                 Log("[TCP  ] conn->Interface(%p) == Interface(%p)",
 163                                         conn->Interface, Interface);
 164                                 // Check that it is coming in on the same interface
 165                                 if(conn->Interface != Interface)        continue;
 166
 167                                 // Check Source Port
 168                                 Log("[TCP  ] conn->RemotePort(%i) == hdr->SourcePort(%i)",
 169                                         conn->RemotePort, ntohs(hdr->SourcePort));
 170                                 if(conn->RemotePort != ntohs(hdr->SourcePort))  continue;
 171
 172                                 // Check Source IP
 173                                 if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
 174                                         continue;
 175                                 if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
 176                                         continue;
 177
 178                                 Log("[TCP  ] Matches connection %p", conn);
 179                                 // We have a response!
 180                                 TCP_INT_HandleConnectionPacket(conn, hdr, Length);
 181
 182                                 return;
 183                         }
 184
 185                         Log("[TCP  ] Opening Connection");
 186                         // Open a new connection (well, check that it's a SYN)
 187                         if(hdr->Flags != TCP_FLAG_SYN) {
 188                                 Log("[TCP  ] Packet is not a SYN");
 189                                 return ;
 190                         }
 191
 192                         // TODO: Check for halfopen max
 193
 194                         conn = calloc(1, sizeof(tTCPConnection));
 195                         conn->State = TCP_ST_HALFOPEN;
 196                         conn->LocalPort = srv->Port;
 197                         conn->RemotePort = ntohs(hdr->SourcePort);
 198                         conn->Interface = Interface;
 199
 200                         switch(Interface->Type)
 201                         {
 202                         case 4: conn->RemoteIP.v4 = *(tIPv4*)Address;   break;
 203                         case 6: conn->RemoteIP.v6 = *(tIPv6*)Address;   break;
 204                         }
 205
 206                         conn->NextSequenceRcv = ntohl( hdr->SequenceNumber ) + 1;
 207                         // + (Length-(hdr->DataOffset>>4)*4);
 208                         conn->NextSequenceSend = rand();
 209
 210                         // Create node
 211                         conn->Node.NumACLs = 1;
 212                         conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
 213                         conn->Node.ImplInt = srv->NextID ++;
 214                         conn->Node.Read = TCP_Client_Read;
 215                         conn->Node.Write = TCP_Client_Write;
 216                         //conn->Node.Close = TCP_SrvConn_Close;
 217
 218                         // Hmm... Theoretically, this lock will never have to wait,
 219                         // as the interface is locked to the watching thread, and this
 220                         // runs in the watching thread. But, it's a good idea to have
 221                         // it, just in case
 222                         // Oh, wait, there is a case where a wildcard can be used
 223                         // (srv->Interface == NULL) so having the lock is a good idea
 224                         LOCK(&srv->lConnections);
 225                         if( !srv->Connections )
 226                                 srv->Connections = conn;
 227                         else
 228                                 srv->ConnectionsTail->Next = conn;
 229                         srv->ConnectionsTail = conn;
 230                         if(!srv->NewConnections)
 231                                 srv->NewConnections = conn;
 232                         RELEASE(&srv->lConnections);
 233
 234                         // Send the SYN ACK
 235                         hdr->Flags |= TCP_FLAG_ACK;
 236                         hdr->AcknowlegementNumber = htonl(conn->NextSequenceRcv);
 237                         hdr->SequenceNumber = htonl(conn->NextSequenceSend);
 238                         hdr->DestPort = hdr->SourcePort;
 239                         hdr->SourcePort = htons(srv->Port);
 240                         hdr->DataOffset = (sizeof(tTCPHeader)/4) << 4;
 241                         TCP_SendPacket( conn, sizeof(tTCPHeader), hdr );
 242
 243                         return ;
 244                 }
 245         }
 246
 247
 248         // Check Open Connections
 249         {
 250                 for( conn = gTCP_OutbountCons; conn; conn = conn->Next )
 251                 {
 252                         // Check that it is coming in on the same interface
 253                         if(conn->Interface != Interface)        continue;
 254
 255                         // Check Source Port
 256                         if(conn->RemotePort != ntohs(hdr->SourcePort))  continue;
 257
 258                         // Check Source IP
 259                         if(conn->Interface->Type == 6 && !IP6_EQU(conn->RemoteIP.v6, *(tIPv6*)Address))
 260                                 continue;
 261                         if(conn->Interface->Type == 4 && !IP4_EQU(conn->RemoteIP.v4, *(tIPv4*)Address))
 262                                 continue;
 263
 264                         TCP_INT_HandleConnectionPacket(conn, hdr, Length);
 265                         return ;
 266                 }
 267         }
 268
 269         Log("[TCP  ] No Match");
 270 }
 271
 272 /**
 273  * \brief Handles a packet sent to a specific connection
 274  */
 275 void TCP_INT_HandleConnectionPacket(tTCPConnection *Connection, tTCPHeader *Header, int Length)
 276 {
 277         tTCPStoredPacket        *pkt;
 278          int    dataLen;
 279
 280         Connection->State = TCP_ST_OPEN;
 281         if(Header->Flags & TCP_FLAG_SYN) {
 282                 Connection->NextSequenceRcv = Header->SequenceNumber + 1;
 283         }
 284
 285         // Get length of data
 286         dataLen = Length - (Header->DataOffset>>4)*4;
 287         Log("[TCP  ] HandleConnectionPacket - dataLen = %i", dataLen);
 288
 289         if(Header->Flags & TCP_FLAG_ACK) {
 290                 // TODO: Process an ACKed Packet
 291                 Log("[TCP  ] Conn %p, Packet 0x%x ACKed", Connection, Header->AcknowlegementNumber);
 292         }
 293
 294         if(dataLen == 0)        return ;
 295
 296         // NOTES:
 297         // Flags
 298         //    PSH - Has Data?
 299         // /NOTES
 300
 301         // Allocate and fill cached packet
 302         pkt = malloc( dataLen + sizeof(tTCPStoredPacket) );
 303         pkt->Next = NULL;
 304         pkt->Sequence = ntohl(Header->SequenceNumber);
 305         pkt->Length = dataLen;
 306         memcpy(pkt->Data, (Uint8*)Header + (Header->DataOffset>>4)*4, dataLen);
 307
 308         // Is this packet the next expected packet?
 309         if( pkt->Sequence != Connection->NextSequenceRcv )
 310         {
 311                 tTCPStoredPacket        *tmp, *prev;
 312
 313                 Log("[TCP  ] Out of sequence packet (0x%08x != 0x%08x)",
 314                         pkt->Sequence, Connection->NextSequenceRcv);
 315
 316                 // No? Well, let's cache it and look at it later
 317                 LOCK( &Connection->lFuturePackets );
 318                 for(tmp = Connection->FuturePackets;
 319                         tmp;
 320                         prev = tmp, tmp = tmp->Next)
 321                 {
 322                         if(tmp->Sequence > pkt->Sequence)       break;
 323                 }
 324                 if(prev)
 325                         prev->Next = pkt;
 326                 else
 327                         Connection->FuturePackets = pkt;
 328                 pkt->Next = tmp;
 329                 RELEASE( &Connection->lFuturePackets );
 330         }
 331         else
 332         {
 333                 // Ooh, Goodie! Add it to the recieved list
 334                 TCP_INT_AppendRecieved(Connection, pkt);
 335                 Connection->NextSequenceRcv ++;
 336
 337                 // TODO: This should be moved out of the watcher thread,
 338                 // so that a single lost packet on one connection doesn't cause
 339                 // all connections on the interface to lag.
 340                 TCP_INT_UpdateRecievedFromFuture(Connection);
 341         }
 342
 343         // TODO: Check ACK code validity
 344         Header->AcknowlegementNumber = ntohl(pkt->Sequence);
 345         Header->SequenceNumber = ntohl(Connection->NextSequenceSend);
 346         Header->Flags &= TCP_FLAG_SYN;
 347         Header->Flags = TCP_FLAG_ACK;
 348         TCP_SendPacket( Connection, sizeof(tTCPHeader), Header );
 349 }
 350
 351 /**
 352  * \brief Appends a packet to the recieved list
 353  */
 354 void TCP_INT_AppendRecieved(tTCPConnection *Connection, tTCPStoredPacket *Pkt)
 355 {
 356         LOCK( &Connection->lRecievedPackets );
 357         if(Connection->RecievedPackets)
 358         {
 359                 Connection->RecievedPacketsTail->Next = Pkt;
 360                 Connection->RecievedPacketsTail = Pkt;
 361         }
 362         else
 363         {
 364                 Connection->RecievedPackets = Pkt;
 365                 Connection->RecievedPacketsTail = Pkt;
 366         }
 367         RELEASE( &Connection->lRecievedPackets );
 368 }
 369
 370 /**
 371  * \brief Updates the connections recieved list from the future list
 372  */
 373 void TCP_INT_UpdateRecievedFromFuture(tTCPConnection *Connection)
 374 {
 375         tTCPStoredPacket        *pkt, *prev;
 376         for(;;)
 377         {
 378                 prev = NULL;
 379                 // Look for the next expected packet in the cache.
 380                 LOCK( &Connection->lFuturePackets );
 381                 for(pkt = Connection->FuturePackets;
 382                         pkt && pkt->Sequence < Connection->NextSequenceRcv;
 383                         prev = pkt, pkt = pkt->Next);
 384
 385                 // If we can't find the expected next packet, stop looking
 386                 if(!pkt || pkt->Sequence > Connection->NextSequenceRcv) {
 387                         RELEASE( &Connection->lFuturePackets );
 388                         return;
 389                 }
 390
 391                 // Delete packet from future list
 392                 if(prev)
 393                         prev->Next = pkt->Next;
 394                 else
 395                         Connection->FuturePackets = pkt->Next;
 396
 397                 // Release list
 398                 RELEASE( &Connection->lFuturePackets );
 399
 400                 // Looks like we found one
 401                 TCP_INT_AppendRecieved(Connection, pkt);
 402                 Connection->NextSequenceRcv ++;
 403         }
 404 }
 405
 406 /**
 407  * \fn Uint16 TCP_GetUnusedPort()
 408  * \brief Gets an unused port and allocates it
 409  */
 410 Uint16 TCP_GetUnusedPort()
 411 {
 412         Uint16  ret;
 413
 414         // Get Next outbound port
 415         ret = giTCP_NextOutPort++;
 416         while( gaTCP_PortBitmap[ret/32] & (1 << (ret%32)) )
 417         {
 418                 ret ++;
 419                 giTCP_NextOutPort++;
 420                 if(giTCP_NextOutPort == 0x10000) {
 421                         ret = giTCP_NextOutPort = TCP_MIN_DYNPORT;
 422                 }
 423         }
 424
 425         // Mark the new port as used
 426         gaTCP_PortBitmap[ret/32] |= 1 << (ret%32);
 427
 428         return ret;
 429 }
 430
 431 /**
 432  * \fn int TCP_AllocatePort(Uint16 Port)
 433  * \brief Marks a port as used
 434  */
 435 int TCP_AllocatePort(Uint16 Port)
 436 {
 437         // Check if the port has already been allocated
 438         if( gaTCP_PortBitmap[Port/32] & (1 << (Port%32)) )
 439                 return 0;
 440
 441         // Allocate
 442         gaTCP_PortBitmap[Port/32] |= 1 << (Port%32);
 443
 444         return 1;
 445 }
 446
 447 /**
 448  * \fn int TCP_DeallocatePort(Uint16 Port)
 449  * \brief Marks a port as unused
 450  */
 451 int TCP_DeallocatePort(Uint16 Port)
 452 {
 453         // Check if the port has already been allocated
 454         if( !(gaTCP_PortBitmap[Port/32] & (1 << (Port%32))) )
 455                 return 0;
 456
 457         // Allocate
 458         gaTCP_PortBitmap[Port/32] &= ~(1 << (Port%32));
 459
 460         return 1;
 461 }
 462
 463 // --- Server
 464 tVFS_Node *TCP_Server_Init(tInterface *Interface)
 465 {
 466         tTCPListener    *srv = malloc( sizeof(tTCPListener) );
 467
 468         srv->Interface = Interface;
 469         srv->Port = 0;
 470         srv->NextID = 0;
 471         srv->Connections = NULL;
 472         srv->Next = NULL;
 473         srv->Node.Flags = VFS_FFLAG_DIRECTORY;
 474         srv->Node.Size = -1;
 475         srv->Node.ImplPtr = srv;
 476         srv->Node.NumACLs = 1;
 477         srv->Node.ACLs = &gVFS_ACL_EveryoneRW;
 478         srv->Node.ReadDir = TCP_Server_ReadDir;
 479         srv->Node.FindDir = TCP_Server_FindDir;
 480         srv->Node.IOCtl = TCP_Server_IOCtl;
 481         srv->Node.Close = TCP_Server_Close;
 482
 483         LOCK(&glTCP_Listeners);
 484         srv->Next = gTCP_Listeners;
 485         gTCP_Listeners = srv;
 486         RELEASE(&glTCP_Listeners);
 487
 488         return &srv->Node;
 489 }
 490
 491 /**
 492  * \brief Wait for a new connection and return the connection ID
 493  * \note Blocks until a new connection is made
 494  * \param Node  Server node
 495  * \param Pos   Position (ignored)
 496  */
 497 char *TCP_Server_ReadDir(tVFS_Node *Node, int Pos)
 498 {
 499         tTCPListener    *srv = Node->ImplPtr;
 500         tTCPConnection  *conn;
 501         char    *ret;
 502
 503         Log("[TCP  ] Thread %i waiting for a connection", Threads_GetTID());
 504         for(;;)
 505         {
 506                 LOCK( &srv->lConnections );
 507                 if( srv->NewConnections != NULL )       break;
 508                 RELEASE( &srv->lConnections );
 509                 Threads_Yield();
 510                 continue;
 511         }
 512
 513
 514         // Increment the new list (the current connection is still on the
 515         // normal list
 516         conn = srv->NewConnections;
 517         srv->NewConnections = conn->Next;
 518
 519         RELEASE( &srv->lConnections );
 520
 521         ret = malloc(9);
 522         itoa(ret, Node->ImplInt, 16, 8, '0');
 523         Log("TCP_Server_ReadDir: RETURN '%s'", ret);
 524         return ret;
 525 }
 526
 527 /**
 528  * \brief Gets a client connection node
 529  * \param Node  Server node
 530  * \param Name  Hexadecimal ID of the node
 531  */
 532 tVFS_Node *TCP_Server_FindDir(tVFS_Node *Node, char *Name)
 533 {
 534         tTCPConnection  *conn;
 535         tTCPListener    *srv = Node->ImplPtr;
 536         char    tmp[9];
 537          int    id = atoi(Name);
 538
 539         // Sanity Check
 540         itoa(tmp, id, 16, 8, '0');
 541         if(strcmp(tmp, Name) != 0)      return NULL;
 542
 543         // Search
 544         LOCK( &srv->lConnections );
 545         for(conn = srv->Connections;
 546                 conn && conn->Node.ImplInt != id;
 547                 conn = conn->Next);
 548         RELEASE( &srv->lConnections );
 549
 550         // If not found, ret NULL
 551         if(!conn)       return NULL;
 552
 553         // Return node
 554         return &conn->Node;
 555 }
 556
 557 /**
 558  * \brief Handle IOCtl calls
 559  */
 560 int TCP_Server_IOCtl(tVFS_Node *Node, int ID, void *Data)
 561 {
 562         tTCPListener    *srv = Node->ImplPtr;
 563
 564         switch(ID)
 565         {
 566         case 4: // Get/Set Port
 567                 if(!Data)       // Get Port
 568                         return srv->Port;
 569
 570                 if(srv->Port)   // Wait, you can't CHANGE the port
 571                         return -1;
 572
 573                 if(!CheckMem(Data, sizeof(Uint16)))     // Sanity check
 574                         return -1;
 575
 576                 // Permissions check
 577                 if(Threads_GetUID() != 0
 578                 && *(Uint16*)Data != 0
 579                 && *(Uint16*)Data < 1024)
 580                         return -1;
 581
 582                 // TODO: Check if a port is in use
 583
 584                 // Set Port
 585                 srv->Port = *(Uint16*)Data;
 586                 if(srv->Port == 0)      // Allocate a random port
 587                         srv->Port = TCP_GetUnusedPort();
 588                 else    // Else, mark this as used
 589                         TCP_AllocatePort(srv->Port);
 590
 591                 Log("[TCP  ] Server %p listening on port %i", srv, srv->Port);
 592
 593                 return srv->Port;
 594         }
 595         return 0;
 596 }
 597
 598 void TCP_Server_Close(tVFS_Node *Node)
 599 {
 600         free(Node->ImplPtr);
 601 }
 602
 603 // --- Client
 604 /**
 605  * \brief Create a client node
 606  */
 607 tVFS_Node *TCP_Client_Init(tInterface *Interface)
 608 {
 609         tTCPConnection  *conn = malloc( sizeof(tTCPConnection) );
 610
 611         conn->State = TCP_ST_CLOSED;
 612         conn->Interface = Interface;
 613         conn->LocalPort = 0;
 614         conn->RemotePort = 0;
 615         memset( &conn->RemoteIP, 0, sizeof(conn->RemoteIP) );
 616
 617         conn->Node.ImplPtr = conn;
 618         conn->Node.NumACLs = 1;
 619         conn->Node.ACLs = &gVFS_ACL_EveryoneRW;
 620         conn->Node.Read = TCP_Client_Read;
 621         conn->Node.Write = TCP_Client_Write;
 622         conn->Node.IOCtl = TCP_Client_IOCtl;
 623         conn->Node.Close = TCP_Client_Close;
 624
 625         LOCK(&glTCP_OutbountCons);
 626         conn->Next = gTCP_OutbountCons;
 627         gTCP_OutbountCons = conn;
 628         RELEASE(&glTCP_OutbountCons);
 629
 630         return &conn->Node;
 631 }
 632
 633 /**
 634  * \brief Wait for a packet and return it
 635  * \note If \a Length is smaller than the size of the packet, the rest
 636  *       of the packet's data will be discarded.
 637  */
 638 Uint64 TCP_Client_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 639 {
 640         tTCPConnection  *conn = Node->ImplPtr;
 641         tTCPStoredPacket        *pkt;
 642
 643         Log("TCP_Client_Read: (Length=%i)", Length);
 644
 645         // Check if connection is open
 646         if( conn->State != TCP_ST_OPEN )        return 0;
 647
 648         // Poll packets
 649         for(;;)
 650         {
 651                 // Lock list and check if there is a packet
 652                 LOCK( &conn->lRecievedPackets );
 653                 if( conn->RecievedPackets == NULL ) {
 654                         // If not, release the lock, yield and try again
 655                         RELEASE( &conn->lRecievedPackets );
 656                         Threads_Yield();
 657                         continue;
 658                 }
 659
 660                 // Get packet pointer
 661                 pkt = conn->RecievedPackets;
 662                 conn->RecievedPackets = pkt->Next;
 663                 // Release the lock (we don't need it any more)
 664                 RELEASE( &conn->lRecievedPackets );
 665
 666                 Log("TCP_Client_Read: pkt->Length = %i", pkt->Length);
 667
 668                 // Copy Data
 669                 if(Length > pkt->Length)        Length = pkt->Length;
 670                 memcpy(Buffer, pkt->Data, Length);
 671
 672                 // Free packet and return
 673                 free(pkt);
 674                 return Length;
 675         }
 676 }
 677
 678 Uint64 TCP_Client_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
 679 {
 680         return 0;
 681 }
 682
 683 /**
 684  * \brief Control a client socket
 685  */
 686 int TCP_Client_IOCtl(tVFS_Node *Node, int ID, void *Data)
 687 {
 688         tTCPConnection  *conn = Node->ImplPtr;
 689
 690         switch(ID)
 691         {
 692         case 4: // Get/Set local port
 693                 if(!Data)
 694                         return conn->LocalPort;
 695                 if(conn->State != TCP_ST_CLOSED)
 696                         return -1;
 697                 if(!CheckMem(Data, sizeof(Uint16)))
 698                         return -1;
 699
 700                 if(Threads_GetUID() != 0 && *(Uint16*)Data < 1024)
 701                         return -1;
 702
 703                 conn->LocalPort = *(Uint16*)Data;
 704                 return 0;
 705
 706         case 5: // Get/Set remote port
 707                 if(!Data)       return conn->RemotePort;
 708                 if(conn->State != TCP_ST_CLOSED)        return -1;
 709                 if(!CheckMem(Data, sizeof(Uint16)))     return -1;
 710                 conn->RemotePort = *(Uint16*)Data;
 711                 return 0;
 712
 713         case 6: // Set Remote IP
 714                 if( conn->State != TCP_ST_CLOSED )
 715                         return -1;
 716                 if( conn->Interface->Type == 4 )
 717                 {
 718                         if(!CheckMem(Data, sizeof(tIPv4)))      return -1;
 719                         conn->RemoteIP.v4 = *(tIPv4*)Data;
 720                 }
 721                 else if( conn->Interface->Type == 6 )
 722                 {
 723                         if(!CheckMem(Data, sizeof(tIPv6)))      return -1;
 724                         conn->RemoteIP.v6 = *(tIPv6*)Data;
 725                 }
 726                 return 0;
 727
 728         case 7: // Connect
 729                 if(conn->LocalPort == -1)
 730                         conn->LocalPort = TCP_GetUnusedPort();
 731                 if(conn->RemotePort == -1)
 732                         return 0;
 733
 734                 TCP_StartConnection(conn);
 735                 return 1;
 736         }
 737
 738         return 0;
 739 }
 740
 741 void TCP_Client_Close(tVFS_Node *Node)
 742 {
 743         free(Node->ImplPtr);
 744 }