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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <assert.h>
  22
  23 #include "winbase.h"
  24 #include "wine/rpcss_shared.h"
  25 #include "wine/debug.h"
  26
  27 #include "rpc_binding.h"
  28
  29 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  30
  31 HANDLE RPCRT4_RpcssNPConnect(void)
  32 {
  33   HANDLE the_pipe = NULL;
  34   DWORD dwmode, wait_result;
  35   HANDLE master_mutex = RPCRT4_GetMasterMutex();
  36
  37   TRACE("\n");
  38
  39   while (TRUE) {
  40
  41     wait_result = WaitForSingleObject(master_mutex, MASTER_MUTEX_TIMEOUT);
  42     switch (wait_result) {
  43       case WAIT_ABANDONED:
  44       case WAIT_OBJECT_0:
  45         break;
  46       case WAIT_FAILED:
  47       case WAIT_TIMEOUT:
  48       default:
  49         ERR("This should never happen: couldn't enter mutex.\n");
  50         return NULL;
  51     }
  52
  53     /* try to open the client side of the named pipe. */
  54     the_pipe = CreateFileA(
  55       NAME_RPCSS_NAMED_PIPE,           /* pipe name */
  56       GENERIC_READ | GENERIC_WRITE,    /* r/w access */
  57       0,                               /* no sharing */
  58       NULL,                            /* no security attributes */
  59       OPEN_EXISTING,                   /* open an existing pipe */
  60       0,                               /* default attributes */
  61       NULL                             /* no template file */
  62     );
  63
  64     if (the_pipe != INVALID_HANDLE_VALUE)
  65       break;
  66
  67     if (GetLastError() != ERROR_PIPE_BUSY) {
  68       WARN("Unable to open named pipe %s (assuming unavailable).\n",
  69         debugstr_a(NAME_RPCSS_NAMED_PIPE));
  70       the_pipe = NULL;
  71       break;
  72     }
  73
  74     WARN("Named pipe busy (will wait)\n");
  75
  76     if (!ReleaseMutex(master_mutex))
  77       ERR("Failed to release master mutex.  Expect deadlock.\n");
  78
  79     /* wait for the named pipe.  We are only
  80        willing to wait only 5 seconds.  It should be available /very/ soon. */
  81     if (! WaitNamedPipeA(NAME_RPCSS_NAMED_PIPE, MASTER_MUTEX_WAITNAMEDPIPE_TIMEOUT))
  82     {
  83       ERR("Named pipe unavailable after waiting.  Something is probably wrong.\n");
  84       return NULL;
  85     }
  86
  87   }
  88
  89   if (the_pipe) {
  90     dwmode = PIPE_READMODE_MESSAGE;
  91     /* SetNamedPipeHandleState not implemented ATM, but still seems to work somehow. */
  92     if (! SetNamedPipeHandleState(the_pipe, &dwmode, NULL, NULL))
  93       WARN("Failed to set pipe handle state\n");
  94   }
  95
  96   if (!ReleaseMutex(master_mutex))
  97     ERR("Uh oh, failed to leave the RPC Master Mutex!\n");
  98
  99   return the_pipe;
 100 }
 101
 102 BOOL RPCRT4_SendReceiveNPMsg(HANDLE np, PRPCSS_NP_MESSAGE msg, char *vardata, PRPCSS_NP_REPLY reply)
 103 {
 104   DWORD count;
 105   UINT32 payload_offset;
 106   RPCSS_NP_MESSAGE vardata_payload_msg;
 107
 108   TRACE("(np == %p, msg == %p, vardata == %p, reply == %p)\n",
 109     np, msg, vardata, reply);
 110
 111   if (! WriteFile(np, msg, sizeof(RPCSS_NP_MESSAGE), &count, NULL)) {
 112     ERR("write failed.\n");
 113     return FALSE;
 114   }
 115
 116   if (count != sizeof(RPCSS_NP_MESSAGE)) {
 117     ERR("write count mismatch.\n");
 118     return FALSE;
 119   }
 120
 121   /* process the vardata payload if necessary */
 122   vardata_payload_msg.message_type = RPCSS_NP_MESSAGE_TYPEID_VARDATAPAYLOADMSG;
 123   vardata_payload_msg.vardata_payload_size = 0; /* meaningless */
 124   for ( payload_offset = 0; payload_offset < msg->vardata_payload_size;
 125         payload_offset += VARDATA_PAYLOAD_BYTES ) {
 126     TRACE("sending vardata payload.  vd=%p, po=%d, ps=%d\n", vardata,
 127       payload_offset, msg->vardata_payload_size);
 128     ZeroMemory(vardata_payload_msg.message.vardatapayloadmsg.payload, VARDATA_PAYLOAD_BYTES);
 129     CopyMemory(vardata_payload_msg.message.vardatapayloadmsg.payload,
 130                vardata,
 131                min( VARDATA_PAYLOAD_BYTES, msg->vardata_payload_size - payload_offset ));
 132     vardata += VARDATA_PAYLOAD_BYTES;
 133     if (! WriteFile(np, &vardata_payload_msg, sizeof(RPCSS_NP_MESSAGE), &count, NULL)) {
 134       ERR("vardata write failed at %u bytes.\n", payload_offset);
 135       return FALSE;
 136     }
 137   }
 138
 139   if (! ReadFile(np, reply, sizeof(RPCSS_NP_REPLY), &count, NULL)) {
 140     ERR("read failed.\n");
 141     return FALSE;
 142   }
 143
 144   if (count != sizeof(RPCSS_NP_REPLY)) {
 145     ERR("read count mismatch. got %ld, expected %u.\n", count, sizeof(RPCSS_NP_REPLY));
 146     return FALSE;
 147   }
 148
 149   /* message execution was successful */
 150   return TRUE;
 151 }