programs/rpcss/np_server.c

   1 /*
   2  * RPCSS named pipe server
   3  *
   4  * Copyright (C) 2002 Greg Turner
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <assert.h>
  22
  23 #include "rpcss.h"
  24 #include "wine/debug.h"
  25
  26 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  27
  28 static HANDLE np_server_end;
  29 static HANDLE np_server_work_event;
  30 static CRITICAL_SECTION np_server_cs;
  31 static LONG srv_thread_count;
  32 static BOOL server_live;
  33
  34 LONG RPCSS_SrvThreadCount(void)
  35 {
  36   return srv_thread_count;
  37 }
  38
  39 BOOL RPCSS_UnBecomePipeServer(void)
  40 {
  41   WINE_TRACE("\n");
  42
  43   WINE_TRACE("shutting down pipe.\n");
  44   server_live = FALSE;
  45   if (!CloseHandle(np_server_end))
  46     WINE_WARN("Failed to close named pipe.\n");
  47   if (!CloseHandle(np_server_work_event))
  48     WINE_WARN("Failed to close the event handle.\n");
  49   DeleteCriticalSection(&np_server_cs);
  50
  51   return TRUE;
  52 }
  53
  54 static void RPCSS_ServerProcessRANMessage(PRPCSS_NP_MESSAGE pMsg, PRPCSS_NP_REPLY pReply)
  55 {
  56   WINE_TRACE("\n");
  57   pReply->as_uint = 0;
  58 }
  59
  60 static void RPCSS_ServerProcessREGISTEREPMessage(PRPCSS_NP_MESSAGE pMsg, PRPCSS_NP_REPLY pReply,
  61   char *vardata)
  62 {
  63   WINE_TRACE("\n");
  64
  65   RPCSS_RegisterRpcEndpoints(
  66     pMsg->message.registerepmsg.iface,
  67     pMsg->message.registerepmsg.object_count,
  68     pMsg->message.registerepmsg.binding_count,
  69     pMsg->message.registerepmsg.no_replace,
  70     vardata,
  71     pMsg->vardata_payload_size
  72   );
  73
  74   /* no reply */
  75   pReply->as_uint = 0;
  76 }
  77
  78 static void RPCSS_ServerProcessUNREGISTEREPMessage(PRPCSS_NP_MESSAGE pMsg,
  79   PRPCSS_NP_REPLY pReply, char *vardata)
  80 {
  81   WINE_TRACE("\n");
  82
  83   RPCSS_UnregisterRpcEndpoints(
  84     pMsg->message.unregisterepmsg.iface,
  85     pMsg->message.unregisterepmsg.object_count,
  86     pMsg->message.unregisterepmsg.binding_count,
  87     vardata,
  88     pMsg->vardata_payload_size
  89   );
  90
  91   /* no reply */
  92   pReply->as_uint = 0;
  93 }
  94
  95 static void RPCSS_ServerProcessRESOLVEEPMessage(PRPCSS_NP_MESSAGE pMsg,
  96   PRPCSS_NP_REPLY pReply, char *vardata)
  97 {
  98   WINE_TRACE("\n");
  99
 100   /* for now, reply is placed into *pReply.as_string, on success, by RPCSS_ResolveRpcEndpoints */
 101   ZeroMemory(pReply->as_string, MAX_RPCSS_NP_REPLY_STRING_LEN);
 102   RPCSS_ResolveRpcEndpoints(
 103     pMsg->message.resolveepmsg.iface,
 104     pMsg->message.resolveepmsg.object,
 105     vardata,
 106     pReply->as_string
 107   );
 108 }
 109
 110 static void RPCSS_ServerProcessMessage(PRPCSS_NP_MESSAGE pMsg, PRPCSS_NP_REPLY pReply, char *vardata)
 111 {
 112   WINE_TRACE("\n");
 113   ZeroMemory(pReply, sizeof(*pReply));
 114   switch (pMsg->message_type) {
 115     case RPCSS_NP_MESSAGE_TYPEID_RANMSG:
 116       RPCSS_ServerProcessRANMessage(pMsg, pReply);
 117       break;
 118     case RPCSS_NP_MESSAGE_TYPEID_REGISTEREPMSG:
 119       RPCSS_ServerProcessREGISTEREPMessage(pMsg, pReply, vardata);
 120       break;
 121     case RPCSS_NP_MESSAGE_TYPEID_UNREGISTEREPMSG:
 122       RPCSS_ServerProcessUNREGISTEREPMessage(pMsg, pReply, vardata);
 123       break;
 124     case RPCSS_NP_MESSAGE_TYPEID_RESOLVEEPMSG:
 125       RPCSS_ServerProcessRESOLVEEPMessage(pMsg, pReply, vardata);
 126       break;
 127     default:
 128       WINE_ERR("Message type unknown!!  No action taken.\n");
 129   }
 130 }
 131
 132 /* each message gets its own thread.  this is it. */
 133 static DWORD WINAPI HandlerThread(LPVOID lpvPipeHandle)
 134 {
 135   RPCSS_NP_MESSAGE msg, vardata_payload_msg;
 136   char *c, *vardata = NULL;
 137   RPCSS_NP_REPLY reply;
 138   DWORD bytesread, written;
 139   BOOL success, had_payload = FALSE;
 140   HANDLE mypipe;
 141
 142   mypipe = (HANDLE) lpvPipeHandle;
 143
 144   WINE_TRACE("mypipe: %p\n", mypipe);
 145
 146   success = ReadFile(
 147     mypipe,                   /* pipe handle */
 148     (char *) &msg,            /* message buffer */
 149     sizeof(RPCSS_NP_MESSAGE), /* message buffer size */
 150     &bytesread,               /* receives number of bytes read */
 151     NULL                      /* not overlapped */
 152   );
 153
 154   if (msg.vardata_payload_size) {
 155     had_payload = TRUE;
 156     /* this fudge space allows us not to worry about exceeding the buffer space
 157        on the last read */
 158     vardata = LocalAlloc(LPTR, (msg.vardata_payload_size) + VARDATA_PAYLOAD_BYTES);
 159     if (!vardata) {
 160       WINE_ERR("vardata memory allocation failure.\n");
 161       success = FALSE;
 162     } else {
 163       for ( c = vardata; (c - vardata) < msg.vardata_payload_size;
 164             c += VARDATA_PAYLOAD_BYTES) {
 165         success = ReadFile(
 166           mypipe,
 167           (char *) &vardata_payload_msg,
 168           sizeof(RPCSS_NP_MESSAGE),
 169           &bytesread,
 170           NULL
 171         );
 172         if ( (!success) || (bytesread != sizeof(RPCSS_NP_MESSAGE)) ||
 173              (vardata_payload_msg.message_type != RPCSS_NP_MESSAGE_TYPEID_VARDATAPAYLOADMSG) ) {
 174           WINE_ERR("vardata payload read failure! (s=%s,br=%d,mt=%u,mt_exp=%u\n",
 175             success ? "TRUE" : "FALSE", bytesread,
 176             vardata_payload_msg.message_type, RPCSS_NP_MESSAGE_TYPEID_VARDATAPAYLOADMSG);
 177           success = FALSE;
 178           break;
 179         }
 180         CopyMemory(c, vardata_payload_msg.message.vardatapayloadmsg.payload, VARDATA_PAYLOAD_BYTES);
 181         WINE_TRACE("payload read.\n");
 182       }
 183     }
 184   }
 185
 186   if (success && (bytesread == sizeof(RPCSS_NP_MESSAGE))) {
 187     WINE_TRACE("read success.\n");
 188     /* process the message and send a reply, serializing requests. */
 189     EnterCriticalSection(&np_server_cs);
 190     WINE_TRACE("processing message.\n");
 191     RPCSS_ServerProcessMessage(&msg, &reply, vardata);
 192     LeaveCriticalSection(&np_server_cs);
 193
 194     if (had_payload) LocalFree(vardata);
 195
 196     WINE_TRACE("message processed, sending reply....\n");
 197
 198     success = WriteFile(
 199       mypipe,                 /* pipe handle */
 200       (char *) &reply,        /* reply buffer */
 201       sizeof(RPCSS_NP_REPLY), /* reply buffer size */
 202       &written,               /* receives number of bytes written */
 203       NULL                    /* not overlapped */
 204     );
 205
 206     if ( (!success) || (written != sizeof(RPCSS_NP_REPLY)) )
 207       WINE_WARN("Message reply failed. (success=%d, br=%d)\n", success, written);
 208     else
 209       WINE_TRACE("Reply sent successfully.\n");
 210   } else
 211     WINE_WARN("Message receipt failed.\n");
 212
 213   FlushFileBuffers(mypipe);
 214   DisconnectNamedPipe(mypipe);
 215   CloseHandle(mypipe);
 216   InterlockedDecrement(&srv_thread_count);
 217   return 0;
 218 }
 219
 220 static DWORD WINAPI NPMainWorkThread(LPVOID ignored)
 221 {
 222   BOOL connected;
 223   HANDLE hthread, master_mutex = RPCSS_GetMasterMutex();
 224   DWORD threadid, wait_result;
 225
 226   WINE_TRACE("\n");
 227
 228   while (server_live) {
 229     connected = ConnectNamedPipe(np_server_end, NULL) ?
 230       TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);
 231
 232     if (connected) {
 233       /* is "work" the act of connecting pipes, or the act of serving
 234          requests successfully?  for now I will make it the former. */
 235       if (!SetEvent(np_server_work_event))
 236         WINE_WARN("failed to signal np_server_work_event.\n");
 237
 238       /* Create a thread for this client.  */
 239       InterlockedIncrement(&srv_thread_count);
 240       hthread = CreateThread(
 241         NULL,                      /* no security attribute */
 242         0,                         /* default stack size */
 243         HandlerThread,
 244         (LPVOID) np_server_end,    /* thread parameter */
 245         0,                         /* not suspended */
 246         &threadid                  /* returns thread ID  (not used) */
 247       );
 248
 249       if (hthread) {
 250         WINE_TRACE("Spawned handler thread: %p\n", hthread);
 251         CloseHandle(hthread);
 252
 253         /* for safety's sake, hold the mutex while we switch the pipe */
 254
 255         wait_result = WaitForSingleObject(master_mutex, MASTER_MUTEX_TIMEOUT);
 256
 257         switch (wait_result) {
 258           case WAIT_ABANDONED: /* ? */
 259           case WAIT_OBJECT_0:
 260             /* we have ownership */
 261             break;
 262           case WAIT_FAILED:
 263           case WAIT_TIMEOUT:
 264           default:
 265             /* huh? */
 266             wait_result = WAIT_FAILED;
 267         }
 268
 269         if (wait_result == WAIT_FAILED) {
 270           WINE_ERR("Couldn't enter master mutex.  Expect problems.\n");
 271         } else {
 272           /* now create a new named pipe instance to listen on */
 273           np_server_end = CreateNamedPipe(
 274             NAME_RPCSS_NAMED_PIPE,                                 /* pipe name */
 275             PIPE_ACCESS_DUPLEX,                                    /* pipe open mode */
 276             PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT, /* pipe-specific modes */
 277             PIPE_UNLIMITED_INSTANCES,                              /* maximum instances */
 278             sizeof(RPCSS_NP_REPLY),                                /* output buffer size */
 279             sizeof(RPCSS_NP_MESSAGE),                              /* input buffer size */
 280             2000,                                                  /* time-out interval */
 281             NULL                                                   /* SD */
 282           );
 283
 284           if (np_server_end == INVALID_HANDLE_VALUE) {
 285             WINE_ERR("Failed to recreate named pipe!\n");
 286             /* not sure what to do? */
 287             assert(FALSE);
 288           }
 289
 290           if (!ReleaseMutex(master_mutex))
 291             WINE_ERR("Uh oh.  Couldn't leave master mutex.  Expect deadlock.\n");
 292         }
 293       } else {
 294         WINE_ERR("Failed to spawn handler thread!\n");
 295         DisconnectNamedPipe(np_server_end);
 296         InterlockedDecrement(&srv_thread_count);
 297       }
 298     }
 299   }
 300   WINE_TRACE("Server thread shutdown.\n");
 301   return 0;
 302 }
 303
 304 static HANDLE RPCSS_NPConnect(void)
 305 {
 306   HANDLE the_pipe;
 307   DWORD dwmode, wait_result;
 308   HANDLE master_mutex = RPCSS_GetMasterMutex();
 309
 310   WINE_TRACE("\n");
 311
 312   while (TRUE) {
 313
 314     wait_result = WaitForSingleObject(master_mutex, MASTER_MUTEX_TIMEOUT);
 315     switch (wait_result) {
 316       case WAIT_ABANDONED:
 317       case WAIT_OBJECT_0:
 318         break;
 319       case WAIT_FAILED:
 320       case WAIT_TIMEOUT:
 321       default:
 322         WINE_ERR("This should never happen: couldn't enter mutex.\n");
 323         return NULL;
 324     }
 325
 326     /* try to open the client side of the named pipe. */
 327     the_pipe = CreateFileA(
 328       NAME_RPCSS_NAMED_PIPE,           /* pipe name */
 329       GENERIC_READ | GENERIC_WRITE,    /* r/w access */
 330       0,                               /* no sharing */
 331       NULL,                            /* no security attributes */
 332       OPEN_EXISTING,                   /* open an existing pipe */
 333       0,                               /* default attributes */
 334       NULL                             /* no template file */
 335     );
 336
 337     if (the_pipe != INVALID_HANDLE_VALUE)
 338       break;
 339
 340     if (GetLastError() != ERROR_PIPE_BUSY) {
 341       WINE_WARN("Unable to open named pipe %s (assuming unavailable).\n",
 342         wine_dbgstr_a(NAME_RPCSS_NAMED_PIPE));
 343       break;
 344     }
 345
 346     WINE_WARN("Named pipe busy (will wait)\n");
 347
 348     if (!ReleaseMutex(master_mutex))
 349       WINE_ERR("Failed to release master mutex.  Expect deadlock.\n");
 350
 351     /* wait for the named pipe.  We are only
 352        willing to wait only 5 seconds.  It should be available /very/ soon. */
 353     if (! WaitNamedPipeA(NAME_RPCSS_NAMED_PIPE, MASTER_MUTEX_WAITNAMEDPIPE_TIMEOUT))
 354     {
 355       WINE_ERR("Named pipe unavailable after waiting.  Something is probably wrong.\n");
 356       return NULL;
 357     }
 358
 359   }
 360
 361   if (the_pipe != INVALID_HANDLE_VALUE) {
 362     dwmode = PIPE_READMODE_MESSAGE;
 363     /* SetNamedPipeHandleState not implemented ATM, but still seems to work somehow. */
 364     if (! SetNamedPipeHandleState(the_pipe, &dwmode, NULL, NULL))
 365       WINE_WARN("Failed to set pipe handle state\n");
 366   }
 367
 368   if (!ReleaseMutex(master_mutex))
 369     WINE_ERR("Uh oh, failed to leave the RPC Master Mutex!\n");
 370
 371   return the_pipe;
 372 }
 373
 374 static BOOL RPCSS_SendReceiveNPMsg(HANDLE np, PRPCSS_NP_MESSAGE msg, PRPCSS_NP_REPLY reply)
 375 {
 376   DWORD count;
 377
 378   WINE_TRACE("(np == %p, msg == %p, reply == %p)\n", np, msg, reply);
 379
 380   if (! WriteFile(np, msg, sizeof(RPCSS_NP_MESSAGE), &count, NULL)) {
 381     WINE_ERR("write failed.\n");
 382     return FALSE;
 383   }
 384
 385   if (count != sizeof(RPCSS_NP_MESSAGE)) {
 386     WINE_ERR("write count mismatch.\n");
 387     return FALSE;
 388   }
 389
 390   if (! ReadFile(np, reply, sizeof(RPCSS_NP_REPLY), &count, NULL)) {
 391     WINE_ERR("read failed.\n");
 392     return FALSE;
 393   }
 394
 395   if (count != sizeof(RPCSS_NP_REPLY)) {
 396     WINE_ERR("read count mismatch, got %d.\n", count);
 397     return FALSE;
 398   }
 399
 400   /* message execution was successful */
 401   return TRUE;
 402 }
 403
 404 BOOL RPCSS_BecomePipeServer(void)
 405 {
 406   RPCSS_NP_MESSAGE msg;
 407   RPCSS_NP_REPLY reply;
 408   BOOL rslt = TRUE;
 409   HANDLE client_handle, hthread, master_mutex = RPCSS_GetMasterMutex();
 410   DWORD threadid, wait_result;
 411
 412   WINE_TRACE("\n");
 413
 414   wait_result = WaitForSingleObject(master_mutex, MASTER_MUTEX_TIMEOUT);
 415
 416   switch (wait_result) {
 417     case WAIT_ABANDONED: /* ? */
 418     case WAIT_OBJECT_0:
 419       /* we have ownership */
 420       break;
 421     case WAIT_FAILED:
 422     case WAIT_TIMEOUT:
 423     default:
 424       WINE_ERR("Couldn't enter master mutex.\n");
 425       return FALSE;
 426   }
 427
 428   /* now we have the master mutex.  during this time we will
 429    *
 430    *   o check if an rpcss already listens on the pipe.  If so,
 431    *     we will tell it we were invoked, which will cause the
 432    *     other end to update its timeouts.  After, we just return
 433    *     false.
 434    *
 435    *   o otherwise, we establish the pipe for ourselves and get
 436    *     ready to listen on it
 437    */
 438
 439   if ((client_handle = RPCSS_NPConnect()) != INVALID_HANDLE_VALUE) {
 440     ZeroMemory(&msg, sizeof(msg));
 441     msg.message_type = RPCSS_NP_MESSAGE_TYPEID_RANMSG;
 442     msg.message.ranmsg.timeout = 1000;
 443     msg.vardata_payload_size = 0;
 444     if (!RPCSS_SendReceiveNPMsg(client_handle, &msg, &reply))
 445       WINE_ERR("Something is amiss: RPC_SendReceive failed.\n");
 446     CloseHandle(client_handle);
 447     rslt = FALSE;
 448   }
 449   if (rslt) {
 450     np_server_work_event = CreateEventA(NULL, FALSE, FALSE, "RpcNpServerWorkEvent");
 451     if (np_server_work_event == NULL) {
 452       /* dunno what we can do then */
 453       WINE_ERR("Unable to create the np_server_work_event\n");
 454       assert(FALSE);
 455     }
 456     InitializeCriticalSection(&np_server_cs);
 457
 458     np_server_end = CreateNamedPipe(
 459       NAME_RPCSS_NAMED_PIPE,                                   /* pipe name */
 460       PIPE_ACCESS_DUPLEX,                                      /* pipe open mode */
 461       PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT,   /* pipe-specific modes */
 462       PIPE_UNLIMITED_INSTANCES,                                /* maximum number of instances */
 463       sizeof(RPCSS_NP_REPLY),                                  /* output buffer size */
 464       sizeof(RPCSS_NP_MESSAGE),                                /* input buffer size */
 465       2000,                                                    /* time-out interval */
 466       NULL                                                     /* SD */
 467     );
 468
 469     if (np_server_end == INVALID_HANDLE_VALUE) {
 470       WINE_ERR("Failed to create named pipe!\n");
 471       DeleteCriticalSection(&np_server_cs);
 472       if (!CloseHandle(np_server_work_event)) /* we will leak the handle... */
 473         WINE_WARN("Failed to close np_server_work_event handle!\n");
 474       np_server_work_event = NULL;
 475       np_server_end = NULL;
 476       rslt = FALSE;
 477     }
 478   }
 479
 480   server_live = rslt;
 481
 482   if (rslt) {
 483     /* OK, now spawn the (single) server thread */
 484     hthread = CreateThread(
 485       NULL,                      /* no security attribute */
 486       0,                         /* default stack size */
 487       NPMainWorkThread,
 488       NULL,             /* thread parameter */
 489       0,                         /* not suspended */
 490       &threadid                  /* returns thread ID  (not used) */
 491     );
 492     if (hthread) {
 493       WINE_TRACE("Created server thread.\n");
 494       CloseHandle(hthread);
 495     } else {
 496       WINE_ERR("Serious error: unable to create server thread!\n");
 497       if (!CloseHandle(np_server_work_event)) /* we will leak the handle... */
 498         WINE_WARN("Failed to close np_server_work_event handle!\n");
 499       if (!CloseHandle(np_server_end)) /* we will leak the handle... */
 500         WINE_WARN("Unable to close named pipe handle!\n");
 501       DeleteCriticalSection(&np_server_cs);
 502       np_server_end = NULL;
 503       np_server_work_event = NULL;
 504       rslt = FALSE;
 505       server_live = FALSE;
 506     }
 507   }
 508   if (!ReleaseMutex(master_mutex))
 509     WINE_ERR("Unable to leave master mutex!??\n");
 510
 511   return rslt;
 512 }
 513
 514 BOOL RPCSS_NPDoWork(HANDLE exit_handle)
 515 {
 516   HANDLE handles[2];
 517   DWORD waitresult;
 518
 519   handles[0] = np_server_work_event;
 520   handles[1] = exit_handle;
 521   waitresult = WaitForMultipleObjects(2, handles, FALSE, INFINITE);
 522
 523   if (waitresult == WAIT_OBJECT_0)
 524     return TRUE;
 525
 526   return FALSE;
 527 }