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