AcessNative/acesskernel_src/server.c

   1 /*
   2  * Acess2 Native Kernel
   3  * - Acess kernel emulation on another OS using SDL and UDP
   4  *
   5  * Syscall Server
   6  */
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <SDL/SDL.h>
  11 #ifdef __WIN32__
  12 # define _WIN32_WINNT 0x0501
  13 # include <windows.h>
  14 # include <winsock2.h>
  15 # include <ws2tcpip.h>
  16 # define close(fd)      closesocket(fd)
  17 typedef int     socklen_t;
  18 #else
  19 # include <unistd.h>
  20 # include <sys/socket.h>
  21 # include <netinet/in.h>
  22 # include <arpa/inet.h> // inet_ntop
  23 #endif
  24 #define DONT_INCLUDE_SYSCALL_NAMES
  25 #include "../syscalls.h"
  26 #include <logdebug.h>   // acess but std
  27 #include <errno.h>
  28
  29 #define USE_TCP 1
  30 #define MAX_CLIENTS     16
  31
  32 // === TYPES ===
  33 typedef struct {
  34          int    ClientID;
  35         SDL_Thread      *WorkerThread;
  36         #if USE_TCP
  37          int    Socket;
  38         #else
  39         tRequestHeader  *CurrentRequest;
  40         struct sockaddr_in      ClientAddr;
  41         SDL_cond        *WaitFlag;
  42         SDL_mutex       *Mutex;
  43         #endif
  44 }       tClient;
  45
  46 // === IMPORTS ===
  47 extern tRequestHeader *SyscallRecieve(tRequestHeader *Request, int *ReturnLength);
  48 extern int      Threads_CreateRootProcess(void);
  49 extern void     Threads_SetThread(int TID);
  50 extern void     *Threads_GetThread(int TID);
  51 extern void     Threads_PostEvent(void *Thread, uint32_t Event);
  52
  53 // === PROTOTYPES ===
  54 tClient *Server_GetClient(int ClientID);
  55  int    Server_WorkerThread(void *ClientPtr);
  56  int    SyscallServer(void);
  57  int    Server_ListenThread(void *Unused);
  58
  59 // === GLOBALS ===
  60 #ifdef __WIN32__
  61 WSADATA gWinsock;
  62 SOCKET  gSocket = INVALID_SOCKET;
  63 #else
  64 # define INVALID_SOCKET -1
  65  int    gSocket = INVALID_SOCKET;
  66 #endif
  67 tClient gaServer_Clients[MAX_CLIENTS];
  68 SDL_Thread      *gpServer_ListenThread;
  69
  70 // === CODE ===
  71 int Server_GetClientID(void)
  72 {
  73          int    i;
  74         Uint32  thisId = SDL_ThreadID();
  75
  76         for( i = 0; i < MAX_CLIENTS; i ++ )
  77         {
  78                 if( SDL_GetThreadID(gaServer_Clients[i].WorkerThread) == thisId )
  79                         return gaServer_Clients[i].ClientID;
  80         }
  81
  82         fprintf(stderr, "ERROR: Server_GetClientID - Thread is not allocated\n");
  83
  84         return 0;
  85 }
  86
  87 tClient *Server_GetClient(int ClientID)
  88 {
  89         tClient *ret = NULL;
  90          int    i;
  91
  92         // Allocate an ID if needed
  93         if(ClientID == 0)
  94                 ClientID = Threads_CreateRootProcess();
  95
  96         for( i = 0; i < MAX_CLIENTS; i ++ )
  97         {
  98                 if( gaServer_Clients[i].ClientID == ClientID ) {
  99                         return &gaServer_Clients[i];
 100                 }
 101                 if(!ret && gaServer_Clients[i].ClientID == 0)
 102                         ret = &gaServer_Clients[i];
 103         }
 104
 105         // Uh oh, no free slots
 106         // TODO: Dynamic allocation
 107         if( !ret )
 108                 return NULL;
 109
 110         // Allocate a thread for the process
 111         ret->ClientID = ClientID;
 112         #if USE_TCP
 113         ret->Socket = 0;
 114         #else
 115         ret->CurrentRequest = NULL;
 116         #endif
 117
 118         if( !ret->WorkerThread ) {
 119                 #if USE_TCP
 120                 #else
 121                 ret->WaitFlag = SDL_CreateCond();
 122                 ret->Mutex = SDL_CreateMutex();
 123                 SDL_mutexP( ret->Mutex );
 124                 #endif
 125                 Log_Debug("Server", "Creating worker for %p", ret);
 126                 ret->WorkerThread = SDL_CreateThread( Server_WorkerThread, ret );
 127         }
 128
 129         return ret;
 130 }
 131
 132 int Server_WorkerThread(void *ClientPtr)
 133 {
 134         tClient *Client = ClientPtr;
 135
 136         Log_Debug("Server", "Worker %p", ClientPtr);
 137
 138         #if USE_TCP
 139
 140         while( *((volatile typeof(Client->Socket)*)&Client->Socket) == 0 )
 141                 ;
 142         Threads_SetThread( Client->ClientID );
 143
 144         while( Client->ClientID != -1 )
 145         {
 146                 fd_set  fds;
 147                  int    nfd = Client->Socket+1;
 148                 FD_ZERO(&fds);
 149                 FD_SET(Client->Socket, &fds);
 150
 151                 int rv = select(nfd, &fds, NULL, NULL, NULL);   // TODO: Timeouts?
 152                 if(rv < 0) {
 153                         perror("select");
 154                         continue ;
 155                 }
 156                 Log_Debug("Server", "%p: rv=%i", Client, rv);
 157
 158                 if( FD_ISSET(Client->Socket, &fds) )
 159                 {
 160                         const int       ciMaxParamCount = 6;
 161                         char    lbuf[sizeof(tRequestHeader) + ciMaxParamCount*sizeof(tRequestValue)];
 162                         tRequestHeader  *hdr = (void*)lbuf;
 163                         size_t  len = recv(Client->Socket, (void*)hdr, sizeof(*hdr), 0);
 164                         Log_Debug("Server", "%i bytes of header", len);
 165                         if( len == 0 )  break;
 166                         if( len == -1 ) {
 167                                 perror("recv header");
 168 //                              Log_Warning("Server", "recv() error - %s", strerror(errno));
 169                                 break;
 170                         }
 171                         if( len != sizeof(*hdr) ) {
 172                                 // Oops?
 173                                 Log_Warning("Server", "FD%i bad sized (%i != exp %i)",
 174                                         Client->Socket, len, sizeof(*hdr));
 175                                 continue ;
 176                         }
 177
 178                         if( hdr->NParams > ciMaxParamCount ) {
 179                                 // Oops.
 180                                 Log_Warning("Server", "FD%i too many params (%i > max %i)",
 181                                         Client->Socket, hdr->NParams, ciMaxParamCount);
 182                                 break ;
 183                         }
 184
 185                         if( hdr->NParams > 0 )
 186                         {
 187                                 len = recv(Client->Socket, (void*)hdr->Params, hdr->NParams*sizeof(tRequestValue), 0);
 188                                 Log_Debug("Server", "%i bytes of params", len);
 189                                 if( len != hdr->NParams*sizeof(tRequestValue) ) {
 190                                         // Oops.
 191                                         perror("recv params");
 192                                         Log_Warning("Sever", "Recieving params failed");
 193                                         break ;
 194                                 }
 195                         }
 196                         else
 197                         {
 198                                 Log_Debug("Server", "No params?");
 199                         }
 200
 201                         // Get buffer size
 202                         size_t  hdrsize = sizeof(tRequestHeader) + hdr->NParams*sizeof(tRequestValue);
 203                         size_t  bufsize = hdrsize;
 204                          int    i;
 205                         for( i = 0; i < hdr->NParams; i ++ )
 206                         {
 207                                 if( hdr->Params[i].Flags & ARG_FLAG_ZEROED )
 208                                         ;
 209                                 else {
 210                                         bufsize += hdr->Params[i].Length;
 211                                 }
 212                         }
 213
 214                         // Allocate full buffer
 215                         hdr = malloc(bufsize);
 216                         memcpy(hdr, lbuf, hdrsize);
 217                         if( bufsize > hdrsize )
 218                         {
 219                                 size_t  rem = bufsize - hdrsize;
 220                                 char    *ptr = (void*)( hdr->Params + hdr->NParams );
 221                                 while( rem )
 222                                 {
 223                                         len = recv(Client->Socket, ptr, rem, 0);
 224                                         Log_Debug("Server", "%i bytes of data", len);
 225                                         if( len == -1 ) {
 226                                                 // Oops?
 227                                                 perror("recv data");
 228                                                 Log_Warning("Sever", "Recieving data failed");
 229                                                 break ;
 230                                         }
 231                                         rem -= len;
 232                                         ptr += len;
 233                                 }
 234                                 if( rem ) {
 235                                         break;
 236                                 }
 237                         }
 238                         else
 239                                 Log_Debug("Server", "no data");
 240
 241                          int    retlen;
 242                         tRequestHeader  *retHeader;
 243                         retHeader = SyscallRecieve(hdr, &retlen);
 244                         if( !retHeader ) {
 245                                 // Some sort of error
 246                                 Log_Warning("Server", "SyscallRecieve failed?");
 247                                 continue ;
 248                         }
 249
 250                         send(Client->Socket, (void*)retHeader, retlen, 0);
 251
 252                         // Clean up
 253                         free(hdr);
 254                 }
 255         }
 256         #else
 257         tRequestHeader  *retHeader;
 258         tRequestHeader  errorHeader;
 259          int    retSize = 0;
 260          int    sentSize;
 261          int    cur_client_id = 0;
 262         while( Client->ClientID != -1 )
 263         {
 264                 // Wait for something to do
 265                 if( Client->CurrentRequest == NULL )
 266                         SDL_CondWait(Client->WaitFlag, Client->Mutex);
 267                 if( Client->CurrentRequest == NULL )
 268                         continue ;
 269
 270 //              Log_Debug("AcessSrv", "Worker got message %p", Client->CurrentRequest);
 271
 272                 if(Client->ClientID != cur_client_id) {
 273 //                      Log_Debug("AcessSrv", "Client thread ID changed from %i to %i",
 274 //                              cur_client_id, Client->ClientID);
 275                         Threads_SetThread( Client->ClientID );
 276                         cur_client_id = Client->ClientID;
 277                 }
 278
 279                 // Debug
 280                 {
 281                         int     callid = Client->CurrentRequest->CallID;
 282                         Log_Debug("AcessSrv", "Client %i request %i %s",
 283                                 Client->ClientID, callid,
 284                                 callid < N_SYSCALLS ? casSYSCALL_NAMES[callid] : "UNK"
 285                                 );
 286                 }
 287
 288                 // Get the response
 289                 retHeader = SyscallRecieve(Client->CurrentRequest, &retSize);
 290
 291                 if( !retHeader ) {
 292                         // Return an error to the client
 293                         printf("ERROR: SyscallRecieve failed\n");
 294                         errorHeader.CallID = Client->CurrentRequest->CallID;
 295                         errorHeader.NParams = 0;
 296                         retHeader = &errorHeader;
 297                         retSize = sizeof(errorHeader);
 298                 }
 299
 300                 // Set ID
 301                 retHeader->ClientID = Client->ClientID;
 302
 303                 // Mark the thread as ready for another job
 304                 free(Client->CurrentRequest);
 305                 Client->CurrentRequest = 0;
 306
 307 //              Log_Debug("AcessSrv", "Sending %i to %x:%i (Client %i)",
 308 //                      retSize, ntohl(Client->ClientAddr.sin_addr.s_addr),
 309 //                      ntohs(Client->ClientAddr.sin_port),
 310 //                      Client->ClientID
 311 //                      );
 312
 313                 // Return the data
 314                 sentSize = sendto(gSocket, retHeader, retSize, 0,
 315                         (struct sockaddr*)&Client->ClientAddr, sizeof(Client->ClientAddr)
 316                         );
 317                 if( sentSize != retSize ) {
 318                         perror("Server_WorkerThread - send");
 319                 }
 320
 321                 // Free allocated header
 322                 if( retHeader != &errorHeader )
 323                         free( retHeader );
 324         }
 325         #endif
 326         Log_Notice("Server", "Terminated Worker %p", ClientPtr);
 327         return 0;
 328 }
 329
 330 int SyscallServer(void)
 331 {
 332         struct sockaddr_in      server;
 333
 334         #ifdef __WIN32__
 335         /* Open windows connection */
 336         if (WSAStartup(0x0101, &gWinsock) != 0)
 337         {
 338                 fprintf(stderr, "Could not open Windows connection.\n");
 339                 exit(0);
 340         }
 341         #endif
 342
 343         #if USE_TCP
 344         // Open TCP Connection
 345         gSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 346         #else
 347         // Open UDP Connection
 348         gSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 349         #endif
 350         if (gSocket == INVALID_SOCKET)
 351         {
 352                 fprintf(stderr, "Could not create socket.\n");
 353                 #if __WIN32__
 354                 WSACleanup();
 355                 #endif
 356                 exit(0);
 357         }
 358
 359         // Set server address
 360         memset(&server, 0, sizeof(struct sockaddr_in));
 361         server.sin_family = AF_INET;
 362         server.sin_port = htons(SERVER_PORT);
 363         server.sin_addr.s_addr = htonl(INADDR_ANY);
 364
 365         // Bind
 366         if( bind(gSocket, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) == -1 )
 367         {
 368                 fprintf(stderr, "Cannot bind address to socket.\n");
 369                 perror("SyscallServer - bind");
 370                 #if __WIN32__
 371                 closesocket(gSocket);
 372                 WSACleanup();
 373                 #else
 374                 close(gSocket);
 375                 #endif
 376                 exit(0);
 377         }
 378
 379         #if USE_TCP
 380         listen(gSocket, 5);
 381         #endif
 382
 383         Log_Notice("AcessSrv", "Listening on 0.0.0.0:%i", SERVER_PORT);
 384         gpServer_ListenThread = SDL_CreateThread( Server_ListenThread, NULL );
 385         return 0;
 386 }
 387
 388 int Server_Shutdown(void)
 389 {
 390         close(gSocket);
 391         for( int i = 0; i < MAX_CLIENTS; i ++ )
 392         {
 393                 if( gaServer_Clients[i].ClientID == 0 )
 394                         continue ;
 395                 Threads_PostEvent( Threads_GetThread(gaServer_Clients[i].ClientID), 0 );
 396                 gaServer_Clients[i].ClientID = -1;
 397                 #if USE_TCP
 398                 close(gaServer_Clients[i].Socket);
 399                 #else
 400                 SDL_CondSignal(gaServer_Clients[i].WaitFlag);
 401                 #endif
 402         }
 403         return 0;
 404 }
 405
 406 int Server_ListenThread(void *Unused)
 407 {
 408         // Wait for something to do :)
 409         for( ;; )
 410         {
 411                 #if USE_TCP
 412                 struct sockaddr_in      clientaddr;
 413                 socklen_t       clientSize = sizeof(clientaddr);
 414                  int    clientSock = accept(gSocket, (struct sockaddr*)&clientaddr, &clientSize);
 415                 if( clientSock < 0 ) {
 416                         perror("SyscallServer - accept");
 417                         break ;
 418                 }
 419
 420                 char    addrstr[4*8+8+1];
 421                 getnameinfo((struct sockaddr*)&clientaddr, sizeof(clientaddr),
 422                         addrstr, sizeof(addrstr), NULL, 0, NI_NUMERICHOST);
 423                 Log_Debug("Server", "Client connection %s:%i", addrstr, ntohs(clientaddr.sin_port));
 424
 425                 // Perform auth
 426                 size_t  len;
 427                 tRequestAuthHdr authhdr;
 428                 len = recv(clientSock, (void*)&authhdr, sizeof(authhdr), 0);
 429                 if( len != sizeof(authhdr) ) {
 430                         // Some form of error?
 431                         Log_Warning("Server", "Client auth block bad size (%i != exp %i)",
 432                                 len, sizeof(authhdr));
 433                         close(clientSock);
 434                         continue ;
 435                 }
 436
 437                 Log_Debug("Server", "Client assumed PID %i", authhdr.pid);
 438
 439                 tClient *client;
 440                 if( authhdr.pid == 0 ) {
 441                         // Allocate PID and client structure/thread
 442                         client = Server_GetClient(0);
 443                         client->Socket = clientSock;
 444                         authhdr.pid = client->ClientID;
 445                 }
 446                 else {
 447                         // Get client structure and make sure it's unused
 448                         // - Auth token / verifcation?
 449                         client = Server_GetClient(authhdr.pid);
 450                         if( !client ) {
 451                                 Log_Warning("Server", "Can't allocate a client struct for %s:%i",
 452                                         addrstr, clientaddr.sin_port);
 453                                 close(clientSock);
 454                                 continue ;
 455                         }
 456                         if( client->Socket != 0 ) {
 457                                 Log_Warning("Server", "Client (%i)%p owned by FD%i but %s:%i tried to use it",
 458                                         authhdr.pid, client, addrstr, clientaddr.sin_port);
 459                                 close(clientSock);
 460                                 continue;
 461                         }
 462                         else {
 463                                 client->Socket = clientSock;
 464                         }
 465                 }
 466                 Log_Debug("Server", "Client given PID %i - info %p", authhdr.pid, client);
 467
 468                 len = send(clientSock, (void*)&authhdr, sizeof(authhdr), 0);
 469                 if( len != sizeof(authhdr) ) {
 470                         // Ok, this is an error
 471                         perror("Sending auth reply");
 472                 }
 473
 474                 // All done, client thread should be watching now
 475
 476                 #else
 477                 char    data[BUFSIZ];
 478                 tRequestHeader  *req = (void*)data;
 479                 struct sockaddr_in      addr;
 480                 uint    clientSize = sizeof(addr);
 481                  int    length;
 482                 tClient *client;
 483
 484                 length = recvfrom(gSocket, data, BUFSIZ, 0, (struct sockaddr*)&addr, &clientSize);
 485
 486                 if( length == -1 ) {
 487                         perror("SyscallServer - recv");
 488                         break;
 489                 }
 490
 491                 // Hand off to a worker thread
 492                 // - TODO: Actually have worker threads
 493 //              Log_Debug("Server", "%i bytes from %x:%i", length,
 494 //                      ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
 495
 496                 client = Server_GetClient(req->ClientID);
 497                 // NOTE: Hack - Should check if all zero
 498                 if( req->ClientID == 0 || client->ClientAddr.sin_port == 0 )
 499                 {
 500                         memcpy(&client->ClientAddr, &addr, sizeof(addr));
 501                 }
 502                 else if( memcmp(&client->ClientAddr, &addr, sizeof(addr)) != 0 )
 503                 {
 504                         printf("ClientID %i used by %x:%i\n",
 505                                 client->ClientID, ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
 506                         printf(" actually owned by %x:%i\n",
 507                                 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
 508                         continue;
 509                 }
 510
 511                 if( client->CurrentRequest ) {
 512                         printf("Worker thread for %x:%i is busy\n",
 513                                 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
 514                         continue;
 515                 }
 516
 517 //              Log_Debug("AcessSrv", "Message from Client %i (%p)",
 518 //                      client->ClientID, client);
 519
 520                 // Make a copy of the request data
 521                 req = malloc(length);
 522                 memcpy(req, data, length);
 523                 client->CurrentRequest = req;
 524                 SDL_CondSignal(client->WaitFlag);
 525                 #endif
 526         }
 527         return -1;
 528 }