dlls/rpcrt4/rpcss_np_client.c

   1 /*
   2  * RPCSS named pipe client implementation
   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 #include <stdarg.h>
  23
  24 #include "windef.h"
  25 #include "winbase.h"
  26 #include "wine/rpcss_shared.h"
  27 #include "wine/debug.h"
  28
  29 #include "rpc_binding.h"
  30
  31 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  32
  33 HANDLE RPCRT4_RpcssNPConnect(void)
  34 {
  35   HANDLE the_pipe;
  36   DWORD dwmode, wait_result;
  37   HANDLE master_mutex = RPCRT4_GetMasterMutex();
  38
  39   TRACE("\n");
  40
  41   while (TRUE) {
  42
  43     wait_result = WaitForSingleObject(master_mutex, MASTER_MUTEX_TIMEOUT);
  44     switch (wait_result) {
  45       case WAIT_ABANDONED:
  46       case WAIT_OBJECT_0:
  47         break;
  48       case WAIT_FAILED:
  49       case WAIT_TIMEOUT:
  50       default:
  51         ERR("This should never happen: couldn't enter mutex.\n");
  52         return NULL;
  53     }
  54
  55     /* try to open the client side of the named pipe. */
  56     the_pipe = CreateFileA(
  57       NAME_RPCSS_NAMED_PIPE,           /* pipe name */
  58       GENERIC_READ | GENERIC_WRITE,    /* r/w access */
  59       0,                               /* no sharing */
  60       NULL,                            /* no security attributes */
  61       OPEN_EXISTING,                   /* open an existing pipe */
  62       0,                               /* default attributes */
  63       NULL                             /* no template file */
  64     );
  65
  66     if (the_pipe != INVALID_HANDLE_VALUE)
  67       break;
  68
  69     if (GetLastError() != ERROR_PIPE_BUSY) {
  70       WARN("Unable to open named pipe %s (assuming unavailable).\n",
  71         debugstr_a(NAME_RPCSS_NAMED_PIPE));
  72       break;
  73     }
  74
  75     WARN("Named pipe busy (will wait)\n");
  76
  77     if (!ReleaseMutex(master_mutex))
  78       ERR("Failed to release master mutex.  Expect deadlock.\n");
  79
  80     /* wait for the named pipe.  We are only willing to wait for 5 seconds.
  81        It should be available /very/ soon. */
  82     if (! WaitNamedPipeA(NAME_RPCSS_NAMED_PIPE, MASTER_MUTEX_WAITNAMEDPIPE_TIMEOUT))
  83     {
  84       ERR("Named pipe unavailable after waiting.  Something is probably wrong.\n");
  85       break;
  86     }
  87
  88   }
  89
  90   if (the_pipe != INVALID_HANDLE_VALUE) {
  91     dwmode = PIPE_READMODE_MESSAGE;
  92     /* SetNamedPipeHandleState not implemented ATM, but still seems to work somehow. */
  93     if (! SetNamedPipeHandleState(the_pipe, &dwmode, NULL, NULL))
  94       WARN("Failed to set pipe handle state\n");
  95   }
  96
  97   if (!ReleaseMutex(master_mutex))
  98     ERR("Uh oh, failed to leave the RPC Master Mutex!\n");
  99
 100   return the_pipe;
 101 }
 102
 103 BOOL RPCRT4_SendReceiveNPMsg(HANDLE np, PRPCSS_NP_MESSAGE msg, char *vardata, PRPCSS_NP_REPLY reply)
 104 {
 105   DWORD count;
 106   UINT32 payload_offset;
 107   RPCSS_NP_MESSAGE vardata_payload_msg;
 108
 109   TRACE("(np == %p, msg == %p, vardata == %p, reply == %p)\n",
 110     np, msg, vardata, reply);
 111
 112   if (! WriteFile(np, msg, sizeof(RPCSS_NP_MESSAGE), &count, NULL)) {
 113     ERR("write failed.\n");
 114     return FALSE;
 115   }
 116
 117   if (count != sizeof(RPCSS_NP_MESSAGE)) {
 118     ERR("write count mismatch.\n");
 119     return FALSE;
 120   }
 121
 122   /* process the vardata payload if necessary */
 123   vardata_payload_msg.message_type = RPCSS_NP_MESSAGE_TYPEID_VARDATAPAYLOADMSG;
 124   vardata_payload_msg.vardata_payload_size = 0; /* meaningless */
 125   for ( payload_offset = 0; payload_offset < msg->vardata_payload_size;
 126         payload_offset += VARDATA_PAYLOAD_BYTES ) {
 127     TRACE("sending vardata payload.  vd=%p, po=%d, ps=%d\n", vardata,
 128       payload_offset, msg->vardata_payload_size);
 129     ZeroMemory(vardata_payload_msg.message.vardatapayloadmsg.payload, VARDATA_PAYLOAD_BYTES);
 130     CopyMemory(vardata_payload_msg.message.vardatapayloadmsg.payload,
 131                vardata,
 132                min( VARDATA_PAYLOAD_BYTES, msg->vardata_payload_size - payload_offset ));
 133     vardata += VARDATA_PAYLOAD_BYTES;
 134     if (! WriteFile(np, &vardata_payload_msg, sizeof(RPCSS_NP_MESSAGE), &count, NULL)) {
 135       ERR("vardata write failed at %u bytes.\n", payload_offset);
 136       return FALSE;
 137     }
 138   }
 139
 140   if (! ReadFile(np, reply, sizeof(RPCSS_NP_REPLY), &count, NULL)) {
 141     ERR("read failed.\n");
 142     return FALSE;
 143   }
 144
 145   if (count != sizeof(RPCSS_NP_REPLY)) {
 146     ERR("read count mismatch. got %d.\n", count);
 147     return FALSE;
 148   }
 149
 150   /* message execution was successful */
 151   return TRUE;
 152 }