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 <netdb.h>     // getaddrinfo
  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         while( *((volatile typeof(Client->Socket)*)&Client->Socket) == 0 )
 140                 ;
 141         Threads_SetThread( Client->ClientID );
 142
 143         while( Client->ClientID != -1 )
 144         {
 145                 fd_set  fds;
 146                  int    nfd = Client->Socket+1;
 147                 FD_ZERO(&fds);
 148                 FD_SET(Client->Socket, &fds);
 149
 150                 int rv = select(nfd, &fds, NULL, NULL, NULL);   // TODO: Timeouts?
 151                 if(rv < 0) {
 152                         perror("select");
 153                         continue ;
 154                 }
 155                 Log_Debug("Server", "%p: rv=%i", Client, rv);
 156
 157                 if( FD_ISSET(Client->Socket, &fds) )
 158                 {
 159                         const int       ciMaxParamCount = 6;
 160                         char    lbuf[sizeof(tRequestHeader) + ciMaxParamCount*sizeof(tRequestValue)];
 161                         tRequestHeader  *hdr = (void*)lbuf;
 162                         size_t  len = recv(Client->Socket, (void*)hdr, sizeof(*hdr), 0);
 163 //                      Log_Debug("Server", "%i bytes of header", len);
 164                         if( len == 0 )  break;
 165                         if( len == -1 ) {
 166                                 perror("recv header");
 167 //                              Log_Warning("Server", "recv() error - %s", strerror(errno));
 168                                 break;
 169                         }
 170                         if( len != sizeof(*hdr) ) {
 171                                 // Oops?
 172                                 Log_Warning("Server", "FD%i bad sized (%i != exp %i)",
 173                                         Client->Socket, len, sizeof(*hdr));
 174                                 continue ;
 175                         }
 176
 177                         if( hdr->NParams > ciMaxParamCount ) {
 178                                 // Oops.
 179                                 Log_Warning("Server", "FD%i too many params (%i > max %i)",
 180                                         Client->Socket, hdr->NParams, ciMaxParamCount);
 181                                 break ;
 182                         }
 183
 184                         if( hdr->NParams > 0 )
 185                         {
 186                                 len = recv(Client->Socket, (void*)hdr->Params, hdr->NParams*sizeof(tRequestValue), 0);
 187 //                              Log_Debug("Server", "%i bytes of params", len);
 188                                 if( len != hdr->NParams*sizeof(tRequestValue) ) {
 189                                         // Oops.
 190                                         perror("recv params");
 191                                         Log_Warning("Sever", "Recieving params failed");
 192                                         break ;
 193                                 }
 194                         }
 195                         else
 196                         {
 197 //                              Log_Debug("Server", "No params?");
 198                         }
 199
 200                         // Get buffer size
 201                         size_t  hdrsize = sizeof(tRequestHeader) + hdr->NParams*sizeof(tRequestValue);
 202                         size_t  bufsize = hdrsize;
 203                          int    i;
 204                         for( i = 0; i < hdr->NParams; i ++ )
 205                         {
 206                                 if( hdr->Params[i].Flags & ARG_FLAG_ZEROED )
 207                                         ;
 208                                 else {
 209                                         bufsize += hdr->Params[i].Length;
 210                                 }
 211                         }
 212
 213                         // Allocate full buffer
 214                         hdr = malloc(bufsize);
 215                         memcpy(hdr, lbuf, hdrsize);
 216                         if( bufsize > hdrsize )
 217                         {
 218                                 size_t  rem = bufsize - hdrsize;
 219                                 char    *ptr = (void*)( hdr->Params + hdr->NParams );
 220                                 while( rem )
 221                                 {
 222                                         len = recv(Client->Socket, ptr, rem, 0);
 223 //                                      Log_Debug("Server", "%i bytes of data", len);
 224                                         if( len == -1 ) {
 225                                                 // Oops?
 226                                                 perror("recv data");
 227                                                 Log_Warning("Sever", "Recieving data failed");
 228                                                 break ;
 229                                         }
 230                                         rem -= len;
 231                                         ptr += len;
 232                                 }
 233                                 if( rem ) {
 234                                         break;
 235                                 }
 236                         }
 237 //                      else
 238 //                              Log_Debug("Server", "no data");
 239
 240                          int    retlen;
 241                         tRequestHeader  *retHeader;
 242                         retHeader = SyscallRecieve(hdr, &retlen);
 243                         if( !retHeader ) {
 244                                 // Some sort of error
 245                                 Log_Warning("Server", "SyscallRecieve failed?");
 246                                 continue ;
 247                         }
 248
 249                         send(Client->Socket, (void*)retHeader, retlen, 0);
 250
 251                         // Clean up
 252                         free(hdr);
 253                 }
 254         }
 255         #else
 256         tRequestHeader  *retHeader;
 257         tRequestHeader  errorHeader;
 258          int    retSize = 0;
 259          int    sentSize;
 260          int    cur_client_id = 0;
 261         while( Client->ClientID != -1 )
 262         {
 263                 // Wait for something to do
 264                 if( Client->CurrentRequest == NULL )
 265                         SDL_CondWait(Client->WaitFlag, Client->Mutex);
 266                 if( Client->CurrentRequest == NULL )
 267                         continue ;
 268
 269 //              Log_Debug("AcessSrv", "Worker got message %p", Client->CurrentRequest);
 270
 271                 if(Client->ClientID != cur_client_id) {
 272 //                      Log_Debug("AcessSrv", "Client thread ID changed from %i to %i",
 273 //                              cur_client_id, Client->ClientID);
 274                         Threads_SetThread( Client->ClientID );
 275                         cur_client_id = Client->ClientID;
 276                 }
 277
 278                 // Debug
 279                 {
 280                         int     callid = Client->CurrentRequest->CallID;
 281                         Log_Debug("AcessSrv", "Client %i request %i %s",
 282                                 Client->ClientID, callid,
 283                                 callid < N_SYSCALLS ? casSYSCALL_NAMES[callid] : "UNK"
 284                                 );
 285                 }
 286
 287                 // Get the response
 288                 retHeader = SyscallRecieve(Client->CurrentRequest, &retSize);
 289
 290                 if( !retHeader ) {
 291                         // Return an error to the client
 292                         printf("ERROR: SyscallRecieve failed\n");
 293                         errorHeader.CallID = Client->CurrentRequest->CallID;
 294                         errorHeader.NParams = 0;
 295                         retHeader = &errorHeader;
 296                         retSize = sizeof(errorHeader);
 297                 }
 298
 299                 // Set ID
 300                 retHeader->ClientID = Client->ClientID;
 301
 302                 // Mark the thread as ready for another job
 303                 free(Client->CurrentRequest);
 304                 Client->CurrentRequest = 0;
 305
 306 //              Log_Debug("AcessSrv", "Sending %i to %x:%i (Client %i)",
 307 //                      retSize, ntohl(Client->ClientAddr.sin_addr.s_addr),
 308 //                      ntohs(Client->ClientAddr.sin_port),
 309 //                      Client->ClientID
 310 //                      );
 311
 312                 // Return the data
 313                 sentSize = sendto(gSocket, retHeader, retSize, 0,
 314                         (struct sockaddr*)&Client->ClientAddr, sizeof(Client->ClientAddr)
 315                         );
 316                 if( sentSize != retSize ) {
 317                         perror("Server_WorkerThread - send");
 318                 }
 319
 320                 // Free allocated header
 321                 if( retHeader != &errorHeader )
 322                         free( retHeader );
 323         }
 324         #endif
 325         Log_Notice("Server", "Terminated Worker %p", ClientPtr);
 326         return 0;
 327 }
 328
 329 int SyscallServer(void)
 330 {
 331         struct sockaddr_in      server;
 332
 333         #ifdef __WIN32__
 334         /* Open windows connection */
 335         if (WSAStartup(0x0101, &gWinsock) != 0)
 336         {
 337                 fprintf(stderr, "Could not open Windows connection.\n");
 338                 exit(0);
 339         }
 340         #endif
 341
 342         #if USE_TCP
 343         // Open TCP Connection
 344         gSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 345         #else
 346         // Open UDP Connection
 347         gSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
 348         #endif
 349         if (gSocket == INVALID_SOCKET)
 350         {
 351                 fprintf(stderr, "Could not create socket.\n");
 352                 #if __WIN32__
 353                 WSACleanup();
 354                 #endif
 355                 exit(0);
 356         }
 357
 358         // Set server address
 359         memset(&server, 0, sizeof(struct sockaddr_in));
 360         server.sin_family = AF_INET;
 361         server.sin_port = htons(SERVER_PORT);
 362         server.sin_addr.s_addr = htonl(INADDR_ANY);
 363
 364         // Bind
 365         if( bind(gSocket, (struct sockaddr *)&server, sizeof(struct sockaddr_in)) == -1 )
 366         {
 367                 fprintf(stderr, "Cannot bind address to socket.\n");
 368                 perror("SyscallServer - bind");
 369                 #if __WIN32__
 370                 closesocket(gSocket);
 371                 WSACleanup();
 372                 #else
 373                 close(gSocket);
 374                 #endif
 375                 exit(0);
 376         }
 377
 378         #if USE_TCP
 379         listen(gSocket, 5);
 380         #endif
 381
 382         Log_Notice("AcessSrv", "Listening on 0.0.0.0:%i", SERVER_PORT);
 383         gpServer_ListenThread = SDL_CreateThread( Server_ListenThread, NULL );
 384         return 0;
 385 }
 386
 387 int Server_Shutdown(void)
 388 {
 389         close(gSocket);
 390         for( int i = 0; i < MAX_CLIENTS; i ++ )
 391         {
 392                 if( gaServer_Clients[i].ClientID == 0 )
 393                         continue ;
 394                 Threads_PostEvent( Threads_GetThread(gaServer_Clients[i].ClientID), 0 );
 395                 gaServer_Clients[i].ClientID = -1;
 396                 #if USE_TCP
 397                 close(gaServer_Clients[i].Socket);
 398                 #else
 399                 SDL_CondSignal(gaServer_Clients[i].WaitFlag);
 400                 #endif
 401         }
 402         return 0;
 403 }
 404
 405 int Server_ListenThread(void *Unused)
 406 {
 407         // Wait for something to do :)
 408         for( ;; )
 409         {
 410                 #if USE_TCP
 411                 struct sockaddr_in      clientaddr;
 412                 socklen_t       clientSize = sizeof(clientaddr);
 413                  int    clientSock = accept(gSocket, (struct sockaddr*)&clientaddr, &clientSize);
 414                 if( clientSock < 0 ) {
 415                         perror("SyscallServer - accept");
 416                         break ;
 417                 }
 418
 419                 char    addrstr[4*8+8+1];
 420                 getnameinfo((struct sockaddr*)&clientaddr, sizeof(clientaddr),
 421                         addrstr, sizeof(addrstr), NULL, 0, NI_NUMERICHOST);
 422                 Log_Debug("Server", "Client connection %s:%i", addrstr, ntohs(clientaddr.sin_port));
 423
 424                 // Perform auth
 425                 size_t  len;
 426                 tRequestAuthHdr authhdr;
 427                 len = recv(clientSock, (void*)&authhdr, sizeof(authhdr), 0);
 428                 if( len != sizeof(authhdr) ) {
 429                         // Some form of error?
 430                         Log_Warning("Server", "Client auth block bad size (%i != exp %i)",
 431                                 len, sizeof(authhdr));
 432                         close(clientSock);
 433                         continue ;
 434                 }
 435
 436                 Log_Debug("Server", "Client assumed PID %i", authhdr.pid);
 437
 438                 tClient *client;
 439                 if( authhdr.pid == 0 ) {
 440                         // Allocate PID and client structure/thread
 441                         client = Server_GetClient(0);
 442                         client->Socket = clientSock;
 443                         authhdr.pid = client->ClientID;
 444                 }
 445                 else {
 446                         // Get client structure and make sure it's unused
 447                         // - Auth token / verifcation?
 448                         client = Server_GetClient(authhdr.pid);
 449                         if( !client ) {
 450                                 Log_Warning("Server", "Can't allocate a client struct for %s:%i",
 451                                         addrstr, clientaddr.sin_port);
 452                                 close(clientSock);
 453                                 continue ;
 454                         }
 455                         if( client->Socket != 0 ) {
 456                                 Log_Warning("Server", "Client (%i)%p owned by FD%i but %s:%i tried to use it",
 457                                         authhdr.pid, client, addrstr, clientaddr.sin_port);
 458                                 close(clientSock);
 459                                 continue;
 460                         }
 461                         else {
 462                                 client->Socket = clientSock;
 463                         }
 464                 }
 465                 Log_Debug("Server", "Client given PID %i - info %p", authhdr.pid, client);
 466
 467                 len = send(clientSock, (void*)&authhdr, sizeof(authhdr), 0);
 468                 if( len != sizeof(authhdr) ) {
 469                         // Ok, this is an error
 470                         perror("Sending auth reply");
 471                 }
 472
 473                 // All done, client thread should be watching now
 474
 475                 #else
 476                 char    data[BUFSIZ];
 477                 tRequestHeader  *req = (void*)data;
 478                 struct sockaddr_in      addr;
 479                 uint    clientSize = sizeof(addr);
 480                  int    length;
 481                 tClient *client;
 482
 483                 length = recvfrom(gSocket, data, BUFSIZ, 0, (struct sockaddr*)&addr, &clientSize);
 484
 485                 if( length == -1 ) {
 486                         perror("SyscallServer - recv");
 487                         break;
 488                 }
 489
 490                 // Hand off to a worker thread
 491                 // - TODO: Actually have worker threads
 492 //              Log_Debug("Server", "%i bytes from %x:%i", length,
 493 //                      ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
 494
 495                 client = Server_GetClient(req->ClientID);
 496                 // NOTE: Hack - Should check if all zero
 497                 if( req->ClientID == 0 || client->ClientAddr.sin_port == 0 )
 498                 {
 499                         memcpy(&client->ClientAddr, &addr, sizeof(addr));
 500                 }
 501                 else if( memcmp(&client->ClientAddr, &addr, sizeof(addr)) != 0 )
 502                 {
 503                         printf("ClientID %i used by %x:%i\n",
 504                                 client->ClientID, ntohl(addr.sin_addr.s_addr), ntohs(addr.sin_port));
 505                         printf(" actually owned by %x:%i\n",
 506                                 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
 507                         continue;
 508                 }
 509
 510                 if( client->CurrentRequest ) {
 511                         printf("Worker thread for %x:%i is busy\n",
 512                                 ntohl(client->ClientAddr.sin_addr.s_addr), ntohs(client->ClientAddr.sin_port));
 513                         continue;
 514                 }
 515
 516 //              Log_Debug("AcessSrv", "Message from Client %i (%p)",
 517 //                      client->ClientID, client);
 518
 519                 // Make a copy of the request data
 520                 req = malloc(length);
 521                 memcpy(req, data, length);
 522                 client->CurrentRequest = req;
 523                 SDL_CondSignal(client->WaitFlag);
 524                 #endif
 525         }
 526         return -1;
 527 }