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 = NULL;
  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       the_pipe = NULL;
  73       break;
  74     }
  75
  76     WARN("Named pipe busy (will wait)\n");
  77
  78     if (!ReleaseMutex(master_mutex))
  79       ERR("Failed to release master mutex.  Expect deadlock.\n");
  80
  81     /* wait for the named pipe.  We are only
  82        willing to wait only 5 seconds.  It should be available /very/ soon. */
  83     if (! WaitNamedPipeA(NAME_RPCSS_NAMED_PIPE, MASTER_MUTEX_WAITNAMEDPIPE_TIMEOUT))
  84     {
  85       ERR("Named pipe unavailable after waiting.  Something is probably wrong.\n");
  86       the_pipe = NULL;
  87       break;
  88     }
  89
  90   }
  91
  92   if (the_pipe) {
  93     dwmode = PIPE_READMODE_MESSAGE;
  94     /* SetNamedPipeHandleState not implemented ATM, but still seems to work somehow. */
  95     if (! SetNamedPipeHandleState(the_pipe, &dwmode, NULL, NULL))
  96       WARN("Failed to set pipe handle state\n");
  97   }
  98
  99   if (!ReleaseMutex(master_mutex))
 100     ERR("Uh oh, failed to leave the RPC Master Mutex!\n");
 101
 102   return the_pipe;
 103 }
 104
 105 BOOL RPCRT4_SendReceiveNPMsg(HANDLE np, PRPCSS_NP_MESSAGE msg, char *vardata, PRPCSS_NP_REPLY reply)
 106 {
 107   DWORD count;
 108   UINT32 payload_offset;
 109   RPCSS_NP_MESSAGE vardata_payload_msg;
 110
 111   TRACE("(np == %p, msg == %p, vardata == %p, reply == %p)\n",
 112     np, msg, vardata, reply);
 113
 114   if (! WriteFile(np, msg, sizeof(RPCSS_NP_MESSAGE), &count, NULL)) {
 115     ERR("write failed.\n");
 116     return FALSE;
 117   }
 118
 119   if (count != sizeof(RPCSS_NP_MESSAGE)) {
 120     ERR("write count mismatch.\n");
 121     return FALSE;
 122   }
 123
 124   /* process the vardata payload if necessary */
 125   vardata_payload_msg.message_type = RPCSS_NP_MESSAGE_TYPEID_VARDATAPAYLOADMSG;
 126   vardata_payload_msg.vardata_payload_size = 0; /* meaningless */
 127   for ( payload_offset = 0; payload_offset < msg->vardata_payload_size;
 128         payload_offset += VARDATA_PAYLOAD_BYTES ) {
 129     TRACE("sending vardata payload.  vd=%p, po=%d, ps=%d\n", vardata,
 130       payload_offset, msg->vardata_payload_size);
 131     ZeroMemory(vardata_payload_msg.message.vardatapayloadmsg.payload, VARDATA_PAYLOAD_BYTES);
 132     CopyMemory(vardata_payload_msg.message.vardatapayloadmsg.payload,
 133                vardata,
 134                min( VARDATA_PAYLOAD_BYTES, msg->vardata_payload_size - payload_offset ));
 135     vardata += VARDATA_PAYLOAD_BYTES;
 136     if (! WriteFile(np, &vardata_payload_msg, sizeof(RPCSS_NP_MESSAGE), &count, NULL)) {
 137       ERR("vardata write failed at %u bytes.\n", payload_offset);
 138       return FALSE;
 139     }
 140   }
 141
 142   if (! ReadFile(np, reply, sizeof(RPCSS_NP_REPLY), &count, NULL)) {
 143     ERR("read failed.\n");
 144     return FALSE;
 145   }
 146
 147   if (count != sizeof(RPCSS_NP_REPLY)) {
 148     ERR("read count mismatch. got %ld.\n", count);
 149     return FALSE;
 150   }
 151
 152   /* message execution was successful */
 153   return TRUE;
 154 }