/*
 * RPC binding API
 *
 * Copyright 2001 Ove Kåven, TransGaming Technologies
 * Copyright 2003 Mike Hearn
 * Copyright 2004 Filip Navara
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * TODO:
 *  - a whole lot
 */

#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>

#include "windef.h"
#include "winbase.h"
#include "winnls.h"
#include "winerror.h"
#include "winreg.h"
#include "winternl.h"
#include "wine/unicode.h"

#include "rpc.h"
#include "rpcndr.h"

#include "wine/debug.h"

#include "rpc_binding.h"
#include "rpc_message.h"

WINE_DEFAULT_DEBUG_CHANNEL(rpc);

LPSTR RPCRT4_strndupA(LPCSTR src, INT slen)
{
  DWORD len;
  LPSTR s;
  if (!src) return NULL;
  if (slen == -1) slen = strlen(src);
  len = slen;
  s = HeapAlloc(GetProcessHeap(), 0, len+1);
  memcpy(s, src, len);
  s[len] = 0;
  return s;
}

LPSTR RPCRT4_strdupWtoA(LPWSTR src)
{
  DWORD len;
  LPSTR s;
  if (!src) return NULL;
  len = WideCharToMultiByte(CP_ACP, 0, src, -1, NULL, 0, NULL, NULL);
  s = HeapAlloc(GetProcessHeap(), 0, len);
  WideCharToMultiByte(CP_ACP, 0, src, -1, s, len, NULL, NULL);
  return s;
}

LPWSTR RPCRT4_strdupAtoW(LPSTR src)
{
  DWORD len;
  LPWSTR s;
  if (!src) return NULL;
  len = MultiByteToWideChar(CP_ACP, 0, src, -1, NULL, 0);
  s = HeapAlloc(GetProcessHeap(), 0, len*sizeof(WCHAR));
  MultiByteToWideChar(CP_ACP, 0, src, -1, s, len);
  return s;
}

LPWSTR RPCRT4_strndupW(LPWSTR src, INT slen)
{
  DWORD len;
  LPWSTR s;
  if (!src) return NULL;
  if (slen == -1) slen = strlenW(src);
  len = slen;
  s = HeapAlloc(GetProcessHeap(), 0, (len+1)*sizeof(WCHAR));
  memcpy(s, src, len*sizeof(WCHAR));
  s[len] = 0;
  return s;
}

void RPCRT4_strfree(LPSTR src)
{
  HeapFree(GetProcessHeap(), 0, src);
}

RPC_STATUS RPCRT4_CreateConnection(RpcConnection** Connection, BOOL server, LPSTR Protseq, LPSTR NetworkAddr, LPSTR Endpoint, LPSTR NetworkOptions, RpcBinding* Binding)
{
  RpcConnection* NewConnection;

  NewConnection = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(RpcConnection));
  NewConnection->server = server;
  NewConnection->Protseq = RPCRT4_strdupA(Protseq);
  NewConnection->NetworkAddr = RPCRT4_strdupA(NetworkAddr);
  NewConnection->Endpoint = RPCRT4_strdupA(Endpoint);
  NewConnection->Used = Binding;
  NewConnection->MaxTransmissionSize = RPC_MAX_PACKET_SIZE;

  TRACE("connection: %p\n", NewConnection);
  *Connection = NewConnection;

  return RPC_S_OK;
}

RPC_STATUS RPCRT4_DestroyConnection(RpcConnection* Connection)
{
  TRACE("connection: %p\n", Connection);

  RPCRT4_CloseConnection(Connection);
  RPCRT4_strfree(Connection->Endpoint);
  RPCRT4_strfree(Connection->NetworkAddr);
  RPCRT4_strfree(Connection->Protseq);
  HeapFree(GetProcessHeap(), 0, Connection);
  return RPC_S_OK;
}

RPC_STATUS RPCRT4_OpenConnection(RpcConnection* Connection)
{
  TRACE("(Connection == ^%p)\n", Connection);
  if (!Connection->conn) {
    if (Connection->server) { /* server */
      /* protseq=ncalrpc: supposed to use NT LPC ports,
       * but we'll implement it with named pipes for now */
      if (strcmp(Connection->Protseq, "ncalrpc") == 0) {
        static LPCSTR prefix = "\\\\.\\pipe\\lrpc\\";
        LPSTR pname;
        pname = HeapAlloc(GetProcessHeap(), 0, strlen(prefix) + strlen(Connection->Endpoint) + 1);
        strcat(strcpy(pname, prefix), Connection->Endpoint);
        TRACE("listening on %s\n", pname);
        Connection->conn = CreateNamedPipeA(pname, PIPE_ACCESS_DUPLEX,
                                         PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE, PIPE_UNLIMITED_INSTANCES,
                                         RPC_MAX_PACKET_SIZE, RPC_MAX_PACKET_SIZE, 5000, NULL);
        HeapFree(GetProcessHeap(), 0, pname);
        memset(&Connection->ovl, 0, sizeof(Connection->ovl));
        Connection->ovl.hEvent = CreateEventW(NULL, TRUE, FALSE, NULL);
        if (!ConnectNamedPipe(Connection->conn, &Connection->ovl)) {
          WARN("Couldn't ConnectNamedPipe (error was %ld)\n", GetLastError());
          if (GetLastError() == ERROR_PIPE_CONNECTED) {
            SetEvent(Connection->ovl.hEvent);
            return RPC_S_OK;
          } else if (GetLastError() == ERROR_IO_PENDING) {
            return RPC_S_OK;
          }
          return RPC_S_SERVER_UNAVAILABLE;
        }
      }
      /* protseq=ncacn_np: named pipes */
      else if (strcmp(Connection->Protseq, "ncacn_np") == 0) {
        static LPCSTR prefix = "\\\\.";
        LPSTR pname;
        pname = HeapAlloc(GetProcessHeap(), 0, strlen(prefix) + strlen(Connection->Endpoint) + 1);
        strcat(strcpy(pname, prefix), Connection->Endpoint);
        TRACE("listening on %s\n", pname);
        Connection->conn = CreateNamedPipeA(pname, PIPE_ACCESS_DUPLEX,
                                         PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT, PIPE_UNLIMITED_INSTANCES,
                                         RPC_MAX_PACKET_SIZE, RPC_MAX_PACKET_SIZE, 5000, NULL);
        HeapFree(GetProcessHeap(), 0, pname);
        memset(&Connection->ovl, 0, sizeof(Connection->ovl));
        Connection->ovl.hEvent = CreateEventW(NULL, TRUE, FALSE, NULL);
        if (!ConnectNamedPipe(Connection->conn, &Connection->ovl)) {
          if (GetLastError() == ERROR_PIPE_CONNECTED) {
            SetEvent(Connection->ovl.hEvent);
            return RPC_S_OK;
          } else if (GetLastError() == ERROR_IO_PENDING) {
            return RPC_S_OK;
          }
          WARN("Couldn't ConnectNamedPipe (error was %ld)\n", GetLastError());
          return RPC_S_SERVER_UNAVAILABLE;
        }
      }
      else {
        ERR("protseq %s not supported\n", Connection->Protseq);
        return RPC_S_PROTSEQ_NOT_SUPPORTED;
      }
    }
    else { /* client */
      /* protseq=ncalrpc: supposed to use NT LPC ports,
       * but we'll implement it with named pipes for now */
      if (strcmp(Connection->Protseq, "ncalrpc") == 0) {
        static LPCSTR prefix = "\\\\.\\pipe\\lrpc\\";
        LPSTR pname;
        HANDLE conn;
        DWORD err;
        DWORD dwMode;

        pname = HeapAlloc(GetProcessHeap(), 0, strlen(prefix) + strlen(Connection->Endpoint) + 1);
        strcat(strcpy(pname, prefix), Connection->Endpoint);
        TRACE("connecting to %s\n", pname);
        while (TRUE) {
          if (WaitNamedPipeA(pname, NMPWAIT_WAIT_FOREVER)) {
            conn = CreateFileA(pname, GENERIC_READ|GENERIC_WRITE, 0, NULL,
                               OPEN_EXISTING, 0, 0);
            if (conn != INVALID_HANDLE_VALUE) break;
            err = GetLastError();
            if (err == ERROR_PIPE_BUSY) continue;
            TRACE("connection failed, error=%lx\n", err);
            HeapFree(GetProcessHeap(), 0, pname);
            return RPC_S_SERVER_TOO_BUSY;
          } else {
            err = GetLastError();
            WARN("connection failed, error=%lx\n", err);
            HeapFree(GetProcessHeap(), 0, pname);
            return RPC_S_SERVER_UNAVAILABLE;
          }
        }

        /* success */
        HeapFree(GetProcessHeap(), 0, pname);
        memset(&Connection->ovl, 0, sizeof(Connection->ovl));
        /* pipe is connected; change to message-read mode. */
        dwMode = PIPE_READMODE_MESSAGE; 
        SetNamedPipeHandleState(conn, &dwMode, NULL, NULL);
        Connection->ovl.hEvent = CreateEventW(NULL, TRUE, FALSE, NULL);
        Connection->conn = conn;
      }
      /* protseq=ncacn_np: named pipes */
      else if (strcmp(Connection->Protseq, "ncacn_np") == 0) {
        static LPCSTR prefix = "\\\\.";
        LPSTR pname;
        HANDLE conn;
        DWORD err;
        DWORD dwMode;

        pname = HeapAlloc(GetProcessHeap(), 0, strlen(prefix) + strlen(Connection->Endpoint) + 1);
        strcat(strcpy(pname, prefix), Connection->Endpoint);
        TRACE("connecting to %s\n", pname);
        conn = CreateFileA(pname, GENERIC_READ|GENERIC_WRITE, 0, NULL,
                           OPEN_EXISTING, 0, 0);
        if (conn == INVALID_HANDLE_VALUE) {
          err = GetLastError();
          /* we don't need to handle ERROR_PIPE_BUSY here,
           * the doc says that it is returned to the app */
          WARN("connection failed, error=%lx\n", err);
          HeapFree(GetProcessHeap(), 0, pname);
          if (err == ERROR_PIPE_BUSY)
            return RPC_S_SERVER_TOO_BUSY;
          else
            return RPC_S_SERVER_UNAVAILABLE;
        }

        /* success */
        HeapFree(GetProcessHeap(), 0, pname);
        memset(&Connection->ovl, 0, sizeof(Connection->ovl));
        /* pipe is connected; change to message-read mode. */
        dwMode = PIPE_READMODE_MESSAGE;
        SetNamedPipeHandleState(conn, &dwMode, NULL, NULL);
        Connection->ovl.hEvent = CreateEventW(NULL, TRUE, FALSE, NULL);
        Connection->conn = conn;
      } else {
        ERR("protseq %s not supported\n", Connection->Protseq);
        return RPC_S_PROTSEQ_NOT_SUPPORTED;
      }
    }
  }
  return RPC_S_OK;
}

RPC_STATUS RPCRT4_CloseConnection(RpcConnection* Connection)
{
  TRACE("(Connection == ^%p)\n", Connection);
  if (Connection->conn) {
    FlushFileBuffers(Connection->conn);
    CloseHandle(Connection->conn);
    Connection->conn = 0;
  }
  if (Connection->ovl.hEvent) {
    CloseHandle(Connection->ovl.hEvent);
    Connection->ovl.hEvent = 0;
  }
  return RPC_S_OK;
}

RPC_STATUS RPCRT4_SpawnConnection(RpcConnection** Connection, RpcConnection* OldConnection)
{
  RpcConnection* NewConnection;
  RPC_STATUS err = RPCRT4_CreateConnection(&NewConnection, OldConnection->server, OldConnection->Protseq,
                                           OldConnection->NetworkAddr, OldConnection->Endpoint, NULL, NULL);
  if (err == RPC_S_OK) {
    /* because of the way named pipes work, we'll transfer the connected pipe
     * to the child, then reopen the server binding to continue listening */
    NewConnection->conn = OldConnection->conn;
    NewConnection->ovl = OldConnection->ovl;
    OldConnection->conn = 0;
    memset(&OldConnection->ovl, 0, sizeof(OldConnection->ovl));
    *Connection = NewConnection;
    RPCRT4_OpenConnection(OldConnection);
  }
  return err;
}

static RPC_STATUS RPCRT4_AllocBinding(RpcBinding** Binding, BOOL server)
{
  RpcBinding* NewBinding;

  NewBinding = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(RpcBinding));
  NewBinding->refs = 1;
  NewBinding->server = server;

  *Binding = NewBinding;

  return RPC_S_OK;
}

RPC_STATUS RPCRT4_CreateBindingA(RpcBinding** Binding, BOOL server, LPSTR Protseq)
{
  RpcBinding* NewBinding;

  RPCRT4_AllocBinding(&NewBinding, server);
  NewBinding->Protseq = RPCRT4_strdupA(Protseq);

  TRACE("binding: %p\n", NewBinding);
  *Binding = NewBinding;

  return RPC_S_OK;
}

RPC_STATUS RPCRT4_CreateBindingW(RpcBinding** Binding, BOOL server, LPWSTR Protseq)
{
  RpcBinding* NewBinding;

  RPCRT4_AllocBinding(&NewBinding, server);
  NewBinding->Protseq = RPCRT4_strdupWtoA(Protseq);

  TRACE("binding: %p\n", NewBinding);
  *Binding = NewBinding;

  return RPC_S_OK;
}

RPC_STATUS RPCRT4_CompleteBindingA(RpcBinding* Binding, LPSTR NetworkAddr,  LPSTR Endpoint,  LPSTR NetworkOptions)
{
  TRACE("(RpcBinding == ^%p, NetworkAddr == \"%s\", EndPoint == \"%s\", NetworkOptions == \"%s\")\n", Binding,
   debugstr_a(NetworkAddr), debugstr_a(Endpoint), debugstr_a(NetworkOptions));

  RPCRT4_strfree(Binding->NetworkAddr);
  Binding->NetworkAddr = RPCRT4_strdupA(NetworkAddr);
  RPCRT4_strfree(Binding->Endpoint);
  if (Endpoint) {
    Binding->Endpoint = RPCRT4_strdupA(Endpoint);
  } else {
    Binding->Endpoint = RPCRT4_strdupA("");
  }
  if (!Binding->Endpoint) ERR("out of memory?\n");

  return RPC_S_OK;
}

RPC_STATUS RPCRT4_CompleteBindingW(RpcBinding* Binding, LPWSTR NetworkAddr, LPWSTR Endpoint, LPWSTR NetworkOptions)
{
  TRACE("(RpcBinding == ^%p, NetworkAddr == \"%s\", EndPoint == \"%s\", NetworkOptions == \"%s\")\n", Binding, 
   debugstr_w(NetworkAddr), debugstr_w(Endpoint), debugstr_w(NetworkOptions));

  RPCRT4_strfree(Binding->NetworkAddr);
  Binding->NetworkAddr = RPCRT4_strdupWtoA(NetworkAddr);
  RPCRT4_strfree(Binding->Endpoint);
  if (Endpoint) {
    Binding->Endpoint = RPCRT4_strdupWtoA(Endpoint);
  } else {
    Binding->Endpoint = RPCRT4_strdupA("");
  }
  if (!Binding->Endpoint) ERR("out of memory?\n");

  return RPC_S_OK;
}

RPC_STATUS RPCRT4_ResolveBinding(RpcBinding* Binding, LPSTR Endpoint)
{
  TRACE("(RpcBinding == ^%p, EndPoint == \"%s\"\n", Binding, Endpoint);

  RPCRT4_strfree(Binding->Endpoint);
  Binding->Endpoint = RPCRT4_strdupA(Endpoint);

  return RPC_S_OK;
}

RPC_STATUS RPCRT4_SetBindingObject(RpcBinding* Binding, UUID* ObjectUuid)
{
  TRACE("(*RpcBinding == ^%p, UUID == %s)\n", Binding, debugstr_guid(ObjectUuid)); 
  if (ObjectUuid) memcpy(&Binding->ObjectUuid, ObjectUuid, sizeof(UUID));
  else UuidCreateNil(&Binding->ObjectUuid);
  return RPC_S_OK;
}

RPC_STATUS RPCRT4_MakeBinding(RpcBinding** Binding, RpcConnection* Connection)
{
  RpcBinding* NewBinding;
  TRACE("(RpcBinding == ^%p, Connection == ^%p)\n", Binding, Connection);

  RPCRT4_AllocBinding(&NewBinding, Connection->server);
  NewBinding->Protseq = RPCRT4_strdupA(Connection->Protseq);
  NewBinding->NetworkAddr = RPCRT4_strdupA(Connection->NetworkAddr);
  NewBinding->Endpoint = RPCRT4_strdupA(Connection->Endpoint);
  NewBinding->FromConn = Connection;

  TRACE("binding: %p\n", NewBinding);
  *Binding = NewBinding;

  return RPC_S_OK;
}

RPC_STATUS RPCRT4_ExportBinding(RpcBinding** Binding, RpcBinding* OldBinding)
{
  InterlockedIncrement(&OldBinding->refs);
  *Binding = OldBinding;
  return RPC_S_OK;
}

RPC_STATUS RPCRT4_DestroyBinding(RpcBinding* Binding)
{
  if (InterlockedDecrement(&Binding->refs))
    return RPC_S_OK;

  TRACE("binding: %p\n", Binding);
  /* FIXME: release connections */
  RPCRT4_strfree(Binding->Endpoint);
  RPCRT4_strfree(Binding->NetworkAddr);
  RPCRT4_strfree(Binding->Protseq);
  HeapFree(GetProcessHeap(), 0, Binding);
  return RPC_S_OK;
}

RPC_STATUS RPCRT4_OpenBinding(RpcBinding* Binding, RpcConnection** Connection,
                              PRPC_SYNTAX_IDENTIFIER TransferSyntax,
                              PRPC_SYNTAX_IDENTIFIER InterfaceId)
{
  RpcConnection* NewConnection;
  RPC_STATUS status;

  TRACE("(Binding == ^%p)\n", Binding);

  /* if we try to bind a new interface and the connection is already opened,
   * close the current connection and create a new with the new binding. */ 
  if (!Binding->server && Binding->FromConn &&
      memcmp(&Binding->FromConn->ActiveInterface, InterfaceId,
             sizeof(RPC_SYNTAX_IDENTIFIER))) {

    TRACE("releasing pre-existing connection\n");
    RPCRT4_DestroyConnection(Binding->FromConn);
    Binding->FromConn = NULL;
  } else {
    /* we already have a connection with acceptable binding, so use it */
    if (Binding->FromConn) {
      *Connection = Binding->FromConn;
      return RPC_S_OK;
    }
  }
  
  /* create a new connection */
  RPCRT4_CreateConnection(&NewConnection, Binding->server, Binding->Protseq, Binding->NetworkAddr, Binding->Endpoint, NULL, Binding);
  *Connection = NewConnection;
  status = RPCRT4_OpenConnection(NewConnection);
  if (status != RPC_S_OK) {
    return status;
  }

  /* we need to send a binding packet if we are client. */
  if (!(*Connection)->server) {
    RpcPktHdr *hdr;
    DWORD count;
    BYTE *response;
    RpcPktHdr *response_hdr;

    TRACE("sending bind request to server\n");

    hdr = RPCRT4_BuildBindHeader(NDR_LOCAL_DATA_REPRESENTATION,
                                 RPC_MAX_PACKET_SIZE, RPC_MAX_PACKET_SIZE,
                                 InterfaceId, TransferSyntax);

    status = RPCRT4_Send(*Connection, hdr, NULL, 0);
    if (status != RPC_S_OK) {
      RPCRT4_DestroyConnection(*Connection);
      return status;
    }

    response = HeapAlloc(GetProcessHeap(), 0, RPC_MAX_PACKET_SIZE);
    if (response == NULL) {
      WARN("Can't allocate memory for binding response\n");
      RPCRT4_DestroyConnection(*Connection);
      return E_OUTOFMEMORY;
    }

    /* get a reply */
    if (!ReadFile(NewConnection->conn, response, RPC_MAX_PACKET_SIZE, &count, NULL)) {
      WARN("ReadFile failed with error %ld\n", GetLastError());
      RPCRT4_DestroyConnection(*Connection);
      return RPC_S_PROTOCOL_ERROR;
    }

    if (count < sizeof(response_hdr->common)) {
      WARN("received invalid header\n");
      RPCRT4_DestroyConnection(*Connection);
      return RPC_S_PROTOCOL_ERROR;
    }

    response_hdr = (RpcPktHdr*)response;

    if (response_hdr->common.rpc_ver != RPC_VER_MAJOR ||
        response_hdr->common.rpc_ver_minor != RPC_VER_MINOR ||
        response_hdr->common.ptype != PKT_BIND_ACK) {
      WARN("invalid protocol version or rejection packet\n");
      RPCRT4_DestroyConnection(*Connection);
      return RPC_S_PROTOCOL_ERROR;
    }

    if (response_hdr->bind_ack.max_tsize < RPC_MIN_PACKET_SIZE) {
      WARN("server doesn't allow large enough packets\n");
      RPCRT4_DestroyConnection(*Connection);
      return RPC_S_PROTOCOL_ERROR;
    }

    /* FIXME: do more checks? */

    (*Connection)->MaxTransmissionSize = response_hdr->bind_ack.max_tsize;
    (*Connection)->ActiveInterface = *InterfaceId;
  }

  return RPC_S_OK;
}

RPC_STATUS RPCRT4_CloseBinding(RpcBinding* Binding, RpcConnection* Connection)
{
  TRACE("(Binding == ^%p)\n", Binding);
  if (!Connection) return RPC_S_OK;
  if (Binding->FromConn == Connection) return RPC_S_OK;
  return RPCRT4_DestroyConnection(Connection);
}

/* utility functions for string composing and parsing */
static unsigned RPCRT4_strcopyA(LPSTR data, LPCSTR src)
{
  unsigned len = strlen(src);
  memcpy(data, src, len*sizeof(CHAR));
  return len;
}

static unsigned RPCRT4_strcopyW(LPWSTR data, LPCWSTR src)
{
  unsigned len = strlenW(src);
  memcpy(data, src, len*sizeof(WCHAR));
  return len;
}

static LPSTR RPCRT4_strconcatA(LPSTR dst, LPCSTR src)
{
  DWORD len = strlen(dst), slen = strlen(src);
  LPSTR ndst = HeapReAlloc(GetProcessHeap(), 0, dst, (len+slen+2)*sizeof(CHAR));
  if (!ndst)
  {
    HeapFree(GetProcessHeap(), 0, dst);
    return NULL;
  }
  ndst[len] = ',';
  memcpy(ndst+len+1, src, slen+1);
  return ndst;
}

static LPWSTR RPCRT4_strconcatW(LPWSTR dst, LPCWSTR src)
{
  DWORD len = strlenW(dst), slen = strlenW(src);
  LPWSTR ndst = HeapReAlloc(GetProcessHeap(), 0, dst, (len+slen+2)*sizeof(WCHAR));
  if (!ndst) 
  {
    HeapFree(GetProcessHeap(), 0, dst);
    return NULL;
  }
  ndst[len] = ',';
  memcpy(ndst+len+1, src, (slen+1)*sizeof(WCHAR));
  return ndst;
}


/***********************************************************************
 *             RpcStringBindingComposeA (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcStringBindingComposeA(unsigned char *ObjUuid, unsigned char *Protseq,
                                           unsigned char *NetworkAddr, unsigned char *Endpoint,
                                           unsigned char *Options, unsigned char** StringBinding )
{
  DWORD len = 1;
  LPSTR data;

  TRACE( "(%s,%s,%s,%s,%s,%p)\n",
        debugstr_a( ObjUuid ), debugstr_a( Protseq ),
        debugstr_a( NetworkAddr ), debugstr_a( Endpoint ),
        debugstr_a( Options ), StringBinding );

  if (ObjUuid && *ObjUuid) len += strlen(ObjUuid) + 1;
  if (Protseq && *Protseq) len += strlen(Protseq) + 1;
  if (NetworkAddr && *NetworkAddr) len += strlen(NetworkAddr);
  if (Endpoint && *Endpoint) len += strlen(Endpoint) + 2;
  if (Options && *Options) len += strlen(Options) + 2;

  data = HeapAlloc(GetProcessHeap(), 0, len);
  *StringBinding = data;

  if (ObjUuid && *ObjUuid) {
    data += RPCRT4_strcopyA(data, ObjUuid);
    *data++ = '@';
  }
  if (Protseq && *Protseq) {
    data += RPCRT4_strcopyA(data, Protseq);
    *data++ = ':';
  }
  if (NetworkAddr && *NetworkAddr)
    data += RPCRT4_strcopyA(data, NetworkAddr);

  if ((Endpoint && *Endpoint) ||
      (Options && *Options)) {
    *data++ = '[';
    if (Endpoint && *Endpoint) {
      data += RPCRT4_strcopyA(data, Endpoint);
      if (Options && *Options) *data++ = ',';
    }
    if (Options && *Options) {
      data += RPCRT4_strcopyA(data, Options);
    }
    *data++ = ']';
  }
  *data = 0;

  return RPC_S_OK;
}

/***********************************************************************
 *             RpcStringBindingComposeW (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcStringBindingComposeW( LPWSTR ObjUuid, LPWSTR Protseq,
                                            LPWSTR NetworkAddr, LPWSTR Endpoint,
                                            LPWSTR Options, LPWSTR* StringBinding )
{
  DWORD len = 1;
  LPWSTR data;

  TRACE("(%s,%s,%s,%s,%s,%p)\n",
       debugstr_w( ObjUuid ), debugstr_w( Protseq ),
       debugstr_w( NetworkAddr ), debugstr_w( Endpoint ),
       debugstr_w( Options ), StringBinding);

  if (ObjUuid && *ObjUuid) len += strlenW(ObjUuid) + 1;
  if (Protseq && *Protseq) len += strlenW(Protseq) + 1;
  if (NetworkAddr && *NetworkAddr) len += strlenW(NetworkAddr);
  if (Endpoint && *Endpoint) len += strlenW(Endpoint) + 2;
  if (Options && *Options) len += strlenW(Options) + 2;

  data = HeapAlloc(GetProcessHeap(), 0, len*sizeof(WCHAR));
  *StringBinding = data;

  if (ObjUuid && *ObjUuid) {
    data += RPCRT4_strcopyW(data, ObjUuid);
    *data++ = '@';
  }
  if (Protseq && *Protseq) {
    data += RPCRT4_strcopyW(data, Protseq);
    *data++ = ':';
  }
  if (NetworkAddr && *NetworkAddr) {
    data += RPCRT4_strcopyW(data, NetworkAddr);
  }
  if ((Endpoint && *Endpoint) ||
      (Options && *Options)) {
    *data++ = '[';
    if (Endpoint && *Endpoint) {
      data += RPCRT4_strcopyW(data, Endpoint);
      if (Options && *Options) *data++ = ',';
    }
    if (Options && *Options) {
      data += RPCRT4_strcopyW(data, Options);
    }
    *data++ = ']';
  }
  *data = 0;

  return RPC_S_OK;
}


/***********************************************************************
 *             RpcStringBindingParseA (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcStringBindingParseA( unsigned char *StringBinding, unsigned char **ObjUuid,
                                          unsigned char **Protseq, unsigned char **NetworkAddr,
                                          unsigned char **Endpoint, unsigned char **Options)
{
  CHAR *data, *next;
  static const char ep_opt[] = "endpoint=";

  TRACE("(%s,%p,%p,%p,%p,%p)\n", debugstr_a(StringBinding),
       ObjUuid, Protseq, NetworkAddr, Endpoint, Options);

  if (ObjUuid) *ObjUuid = NULL;
  if (Protseq) *Protseq = NULL;
  if (NetworkAddr) *NetworkAddr = NULL;
  if (Endpoint) *Endpoint = NULL;
  if (Options) *Options = NULL;

  data = StringBinding;

  next = strchr(data, '@');
  if (next) {
    if (ObjUuid) *ObjUuid = RPCRT4_strndupA(data, next - data);
    data = next+1;
  }

  next = strchr(data, ':');
  if (next) {
    if (Protseq) *Protseq = RPCRT4_strndupA(data, next - data);
    data = next+1;
  }

  next = strchr(data, '[');
  if (next) {
    CHAR *close, *opt;

    if (NetworkAddr) *NetworkAddr = RPCRT4_strndupA(data, next - data);
    data = next+1;
    close = strchr(data, ']');
    if (!close) goto fail;

    /* tokenize options */
    while (data < close) {
      next = strchr(data, ',');
      if (!next || next > close) next = close;
      /* FIXME: this is kind of inefficient */
      opt = RPCRT4_strndupA(data, next - data);
      data = next+1;

      /* parse option */
      next = strchr(opt, '=');
      if (!next) {
        /* not an option, must be an endpoint */
        if (*Endpoint) goto fail;
        *Endpoint = opt;
      } else {
        if (strncmp(opt, ep_opt, strlen(ep_opt)) == 0) {
          /* endpoint option */
          if (*Endpoint) goto fail;
          *Endpoint = RPCRT4_strdupA(next+1);
          HeapFree(GetProcessHeap(), 0, opt);
        } else {
          /* network option */
          if (*Options) {
            /* FIXME: this is kind of inefficient */
            *Options = RPCRT4_strconcatA(*Options, opt);
            HeapFree(GetProcessHeap(), 0, opt);
          } else 
	    *Options = opt;
        }
      }
    }

    data = close+1;
    if (*data) goto fail;
  }
  else if (NetworkAddr) 
    *NetworkAddr = RPCRT4_strdupA(data);

  return RPC_S_OK;

fail:
  if (ObjUuid) RpcStringFreeA((unsigned char**)ObjUuid);
  if (Protseq) RpcStringFreeA((unsigned char**)Protseq);
  if (NetworkAddr) RpcStringFreeA((unsigned char**)NetworkAddr);
  if (Endpoint) RpcStringFreeA((unsigned char**)Endpoint);
  if (Options) RpcStringFreeA((unsigned char**)Options);
  return RPC_S_INVALID_STRING_BINDING;
}

/***********************************************************************
 *             RpcStringBindingParseW (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcStringBindingParseW( LPWSTR StringBinding, LPWSTR *ObjUuid,
                                          LPWSTR *Protseq, LPWSTR *NetworkAddr,
                                          LPWSTR *Endpoint, LPWSTR *Options)
{
  WCHAR *data, *next;
  static const WCHAR ep_opt[] = {'e','n','d','p','o','i','n','t','=',0};

  TRACE("(%s,%p,%p,%p,%p,%p)\n", debugstr_w(StringBinding),
       ObjUuid, Protseq, NetworkAddr, Endpoint, Options);

  if (ObjUuid) *ObjUuid = NULL;
  if (Protseq) *Protseq = NULL;
  if (NetworkAddr) *NetworkAddr = NULL;
  if (Endpoint) *Endpoint = NULL;
  if (Options) *Options = NULL;

  data = StringBinding;

  next = strchrW(data, '@');
  if (next) {
    if (ObjUuid) *ObjUuid = RPCRT4_strndupW(data, next - data);
    data = next+1;
  }

  next = strchrW(data, ':');
  if (next) {
    if (Protseq) *Protseq = RPCRT4_strndupW(data, next - data);
    data = next+1;
  }

  next = strchrW(data, '[');
  if (next) {
    WCHAR *close, *opt;

    if (NetworkAddr) *NetworkAddr = RPCRT4_strndupW(data, next - data);
    data = next+1;
    close = strchrW(data, ']');
    if (!close) goto fail;

    /* tokenize options */
    while (data < close) {
      next = strchrW(data, ',');
      if (!next || next > close) next = close;
      /* FIXME: this is kind of inefficient */
      opt = RPCRT4_strndupW(data, next - data);
      data = next+1;

      /* parse option */
      next = strchrW(opt, '=');
      if (!next) {
        /* not an option, must be an endpoint */
        if (*Endpoint) goto fail;
        *Endpoint = opt;
      } else {
        if (strncmpW(opt, ep_opt, strlenW(ep_opt)) == 0) {
          /* endpoint option */
          if (*Endpoint) goto fail;
          *Endpoint = RPCRT4_strdupW(next+1);
          HeapFree(GetProcessHeap(), 0, opt);
        } else {
          /* network option */
          if (*Options) {
            /* FIXME: this is kind of inefficient */
            *Options = RPCRT4_strconcatW(*Options, opt);
            HeapFree(GetProcessHeap(), 0, opt);
          } else 
	    *Options = opt;
        }
      }
    }

    data = close+1;
    if (*data) goto fail;
  } else if (NetworkAddr) 
    *NetworkAddr = RPCRT4_strdupW(data);

  return RPC_S_OK;

fail:
  if (ObjUuid) RpcStringFreeW(ObjUuid);
  if (Protseq) RpcStringFreeW(Protseq);
  if (NetworkAddr) RpcStringFreeW(NetworkAddr);
  if (Endpoint) RpcStringFreeW(Endpoint);
  if (Options) RpcStringFreeW(Options);
  return RPC_S_INVALID_STRING_BINDING;
}

/***********************************************************************
 *             RpcBindingFree (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcBindingFree( RPC_BINDING_HANDLE* Binding )
{
  RPC_STATUS status;
  TRACE("(%p) = %p\n", Binding, *Binding);
  status = RPCRT4_DestroyBinding(*Binding);
  if (status == RPC_S_OK) *Binding = 0;
  return status;
}
  
/***********************************************************************
 *             RpcBindingVectorFree (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcBindingVectorFree( RPC_BINDING_VECTOR** BindingVector )
{
  RPC_STATUS status;
  unsigned long c;

  TRACE("(%p)\n", BindingVector);
  for (c=0; c<(*BindingVector)->Count; c++) {
    status = RpcBindingFree(&(*BindingVector)->BindingH[c]);
  }
  HeapFree(GetProcessHeap(), 0, *BindingVector);
  *BindingVector = NULL;
  return RPC_S_OK;
}
  
/***********************************************************************
 *             RpcBindingInqObject (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcBindingInqObject( RPC_BINDING_HANDLE Binding, UUID* ObjectUuid )
{
  RpcBinding* bind = (RpcBinding*)Binding;

  TRACE("(%p,%p) = %s\n", Binding, ObjectUuid, debugstr_guid(&bind->ObjectUuid));
  memcpy(ObjectUuid, &bind->ObjectUuid, sizeof(UUID));
  return RPC_S_OK;
}
  
/***********************************************************************
 *             RpcBindingSetObject (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcBindingSetObject( RPC_BINDING_HANDLE Binding, UUID* ObjectUuid )
{
  RpcBinding* bind = (RpcBinding*)Binding;

  TRACE("(%p,%s)\n", Binding, debugstr_guid(ObjectUuid));
  if (bind->server) return RPC_S_WRONG_KIND_OF_BINDING;
  return RPCRT4_SetBindingObject(Binding, ObjectUuid);
}

/***********************************************************************
 *             RpcBindingFromStringBindingA (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcBindingFromStringBindingA( unsigned char *StringBinding, RPC_BINDING_HANDLE* Binding )
{
  RPC_STATUS ret;
  RpcBinding* bind = NULL;
  unsigned char *ObjectUuid, *Protseq, *NetworkAddr, *Endpoint, *Options;
  UUID Uuid;

  TRACE("(%s,%p)\n", debugstr_a(StringBinding), Binding);

  ret = RpcStringBindingParseA(StringBinding, &ObjectUuid, &Protseq,
                              &NetworkAddr, &Endpoint, &Options);
  if (ret != RPC_S_OK) return ret;

  ret = UuidFromStringA(ObjectUuid, &Uuid);

  if (ret == RPC_S_OK)
    ret = RPCRT4_CreateBindingA(&bind, FALSE, Protseq);
  if (ret == RPC_S_OK)
    ret = RPCRT4_SetBindingObject(bind, &Uuid);
  if (ret == RPC_S_OK)
    ret = RPCRT4_CompleteBindingA(bind, NetworkAddr, Endpoint, Options);

  RpcStringFreeA((unsigned char**)&Options);
  RpcStringFreeA((unsigned char**)&Endpoint);
  RpcStringFreeA((unsigned char**)&NetworkAddr);
  RpcStringFreeA((unsigned char**)&Protseq);
  RpcStringFreeA((unsigned char**)&ObjectUuid);

  if (ret == RPC_S_OK) 
    *Binding = (RPC_BINDING_HANDLE)bind;
  else 
    RPCRT4_DestroyBinding(bind);

  return ret;
}

/***********************************************************************
 *             RpcBindingFromStringBindingW (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcBindingFromStringBindingW( LPWSTR StringBinding, RPC_BINDING_HANDLE* Binding )
{
  RPC_STATUS ret;
  RpcBinding* bind = NULL;
  LPWSTR ObjectUuid, Protseq, NetworkAddr, Endpoint, Options;
  UUID Uuid;

  TRACE("(%s,%p)\n", debugstr_w(StringBinding), Binding);

  ret = RpcStringBindingParseW(StringBinding, &ObjectUuid, &Protseq,
                              &NetworkAddr, &Endpoint, &Options);
  if (ret != RPC_S_OK) return ret;

  ret = UuidFromStringW(ObjectUuid, &Uuid);

  if (ret == RPC_S_OK)
    ret = RPCRT4_CreateBindingW(&bind, FALSE, Protseq);
  if (ret == RPC_S_OK)
    ret = RPCRT4_SetBindingObject(bind, &Uuid);
  if (ret == RPC_S_OK)
    ret = RPCRT4_CompleteBindingW(bind, NetworkAddr, Endpoint, Options);

  RpcStringFreeW(&Options);
  RpcStringFreeW(&Endpoint);
  RpcStringFreeW(&NetworkAddr);
  RpcStringFreeW(&Protseq);
  RpcStringFreeW(&ObjectUuid);

  if (ret == RPC_S_OK)
    *Binding = (RPC_BINDING_HANDLE)bind;
  else
    RPCRT4_DestroyBinding(bind);

  return ret;
}
  
/***********************************************************************
 *             RpcBindingToStringBindingA (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcBindingToStringBindingA( RPC_BINDING_HANDLE Binding, unsigned char** StringBinding )
{
  RPC_STATUS ret;
  RpcBinding* bind = (RpcBinding*)Binding;
  LPSTR ObjectUuid;

  TRACE("(%p,%p)\n", Binding, StringBinding);

  ret = UuidToStringA(&bind->ObjectUuid, (unsigned char**)&ObjectUuid);
  if (ret != RPC_S_OK) return ret;

  ret = RpcStringBindingComposeA(ObjectUuid, bind->Protseq, bind->NetworkAddr,
                                 bind->Endpoint, NULL, StringBinding);

  RpcStringFreeA((unsigned char**)&ObjectUuid);

  return ret;
}
  
/***********************************************************************
 *             RpcBindingToStringBindingW (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcBindingToStringBindingW( RPC_BINDING_HANDLE Binding, unsigned short** StringBinding )
{
  RPC_STATUS ret;
  unsigned char *str = NULL;
  TRACE("(%p,%p)\n", Binding, StringBinding);
  ret = RpcBindingToStringBindingA(Binding, &str);
  *StringBinding = RPCRT4_strdupAtoW(str);
  RpcStringFreeA((unsigned char**)&str);
  return ret;
}

/***********************************************************************
 *             I_RpcBindingSetAsync (RPCRT4.@)
 * NOTES
 *  Exists in win9x and winNT, but with different number of arguments
 *  (9x version has 3 arguments, NT has 2).
 */
RPC_STATUS WINAPI I_RpcBindingSetAsync( RPC_BINDING_HANDLE Binding, RPC_BLOCKING_FN BlockingFn)
{
  RpcBinding* bind = (RpcBinding*)Binding;

  TRACE( "(%p,%p): stub\n", Binding, BlockingFn );

  bind->BlockingFn = BlockingFn;

  return RPC_S_OK;
}

/***********************************************************************
 *             RpcNetworkIsProtseqValidA (RPCRT4.@)
 */
RPC_STATUS WINAPI RpcNetworkIsProtseqValidA(unsigned char *protseq) {
  UNICODE_STRING protseqW;

  if (!protseq) return RPC_S_INVALID_RPC_PROTSEQ; /* ? */
  
  if (RtlCreateUnicodeStringFromAsciiz(&protseqW, protseq)) {
    RPC_STATUS ret = RpcNetworkIsProtseqValidW(protseqW.Buffer);
    RtlFreeUnicodeString(&protseqW);
    return ret;
  } else return RPC_S_OUT_OF_MEMORY;
}

/***********************************************************************
 *             RpcNetworkIsProtseqValidW (RPCRT4.@)
 * 
 * Checks if the given protocol sequence is known by the RPC system.
 * If it is, returns RPC_S_OK, otherwise RPC_S_PROTSEQ_NOT_SUPPORTED.
 *
 * We currently support:
 *   ncalrpc   local-only rpc over LPC (LPC is not really used)
 *   ncacn_np  rpc over named pipes
 */
RPC_STATUS WINAPI RpcNetworkIsProtseqValidW(LPWSTR protseq) {
  static const WCHAR protseqsW[][15] = { 
    {'n','c','a','l','r','p','c',0},
    {'n','c','a','c','n','_','n','p',0}
  };
  static const int count = sizeof(protseqsW) / sizeof(protseqsW[0]);
  int i;

  if (!protseq) return RPC_S_INVALID_RPC_PROTSEQ; /* ? */

  for (i = 0; i < count; i++) {
    if (!strcmpW(protseq, protseqsW[i])) return RPC_S_OK;
  }
  
  FIXME("Unknown protseq %s - we probably need to implement it one day\n", debugstr_w(protseq));
  return RPC_S_PROTSEQ_NOT_SUPPORTED;
}

/***********************************************************************
 *             RpcImpersonateClient (RPCRT4.@)
 *
 * Impersonates the client connected via a binding handle so that security
 * checks are done in the context of the client.
 *
 * PARAMS
 *  BindingHandle [I] Handle to the binding to the client.
 *
 * RETURNS
 *  Success: RPS_S_OK.
 *  Failure: RPC_STATUS value.
 *
 * NOTES
 *
 * If BindingHandle is NULL then the function impersonates the client
 * connected to the binding handle of the current thread.
 */
RPC_STATUS WINAPI RpcImpersonateClient(RPC_BINDING_HANDLE BindingHandle)
{
    FIXME("(%p): stub\n", BindingHandle);
    return RPC_S_OK;
}

/***********************************************************************
 *             RpcRevertToSelfEx (RPCRT4.@)
 *
 * Stops impersonating the client connected to the binding handle so that security
 * checks are no longer done in the context of the client.
 *
 * PARAMS
 *  BindingHandle [I] Handle to the binding to the client.
 *
 * RETURNS
 *  Success: RPS_S_OK.
 *  Failure: RPC_STATUS value.
 *
 * NOTES
 *
 * If BindingHandle is NULL then the function stops impersonating the client
 * connected to the binding handle of the current thread.
 */
RPC_STATUS WINAPI RpcRevertToSelfEx(RPC_BINDING_HANDLE BindingHandle)
{
    FIXME("(%p): stub\n", BindingHandle);
    return RPC_S_OK;
}
