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/*++
Copyright (c) 1995 Microsoft Corporation
Module Name :
rpcutil.c
Abstract:
This module defines functions that may help to replace the rpc util functions from rpcutil.lib
Author:
Murali R. Krishnan ( MuraliK ) 15-Sept-1995
Environment: Win32 User Mode
Project:
Common Code for Internet Services
Functions Exported:
MIDL_user_allocate() MIDL_user_free() RpcBindHandleForServer() RpcBindHandleFree()
Revision History:
Murali R. Krishnan (MuraliK) 21-Dec-1995 Support TcpIp binding & free. Murali R. Krishnan (MuraliK) 20-Feb-1996 Support Lpc binding & free.
--*/
/************************************************************
* Include Headers ************************************************************/
# include <windows.h>
# include <rpc.h>
# include "apiutil.h"
#ifndef _NO_TRACING_
#include <pudebug.h>
#else
# if DBG
# include <stdio.h>
# include <stdlib.h>
# define DBGPRINTF(s) { CHAR rgchBuff[1024]; \
sprintf s ; \ OutputDebugStringA( rgchBuff); \ }# define DBG_CONTEXT ( rgchBuff)
# else // DBG
# define DBGPRINTF(s) /* nothing */
# define DBG_CONTEXT /* nothing */
# endif // DBG
# endif // _NO_TRACING_
#define ISRPC_CLIENT_OVER_TCPIP 0x00000001
#define ISRPC_CLIENT_OVER_NP 0x00000002
#define ISRPC_CLIENT_OVER_SPX 0x00000004
#define ISRPC_CLIENT_OVER_LPC 0x00000008
// # define MAX_COMPUTERNAME_LENGTH (255)
/************************************************************
* Functions ************************************************************/
PVOIDMIDL_user_allocate(IN size_t size)/*++
Routine Description:
MIDL memory allocation.
Arguments:
size : Memory size requested.
Return Value:
Pointer to the allocated memory block.
--*/{ PVOID pvBlob;
pvBlob = LocalAlloc( LPTR, size);
return( pvBlob );
} // MIDL_user_allocate()
VOIDMIDL_user_free(IN PVOID pvBlob)/*++
Routine Description:
MIDL memory free .
Arguments:
pvBlob : Pointer to a memory block that is freed.
Return Value:
None.
--*/{ LocalFree( pvBlob);
return;} // MIDL_user_free()
RPC_STATUSRpcBindHandleOverNamedPipe( OUT handle_t * pBindingHandle, IN LPWSTR pwszServerName, IN LPWSTR pwszEndpoint, IN LPWSTR pwszOptions )/*++
This function uses the parameters supplied and generates a named pipe binding handle for RPC.
Arguments: pBindingHandle pointer to location which will contain binding handle on successful return pwszServerName pointer to string containing the name of the server to which, this function will obtain a binding. pwszEndpoint pointer to string containing the Named Pipe Endpoint pwszOptions pointer to string containing any additional options for binding.
Returns: RPC_STATUS - RPC_S_OK on success Also on success, the binding handle is stored in pBindingHandle. It should freed after usage, using the RpcBindingFree() function.
--*/{ RPC_STATUS rpcStatus; LPWSTR pwszBinding = NULL;
if ( pBindingHandle != NULL) {
*pBindingHandle = NULL; // init the value
}
//
// Compose the binding string for named pipe binding
//
rpcStatus = RpcStringBindingComposeW(0, // ObjUuid
L"ncacn_np", // prot seq: named pipe
pwszServerName, // NetworkAddr
pwszEndpoint, // Endpoint
pwszOptions, // Options
&pwszBinding); // StringBinding
if ( rpcStatus == RPC_S_OK ) {
//
// establish the binding handle using string binding.
//
rpcStatus = RpcBindingFromStringBindingW(pwszBinding, pBindingHandle ); }
//
// Cleanup and return back.
//
if ( pwszBinding != NULL) { RpcStringFreeW(&pwszBinding); }
if ( rpcStatus != RPC_S_OK) {
if ( pBindingHandle != NULL && *pBindingHandle != NULL) {
// RPC should have freed the binding handle.
// We will free it now.
RpcBindingFree(pBindingHandle); *pBindingHandle = NULL; } }
return (rpcStatus);
} // RpcBindHandleOverNamedPipe()
RPC_STATUSRpcBindHandleOverLpc( OUT handle_t * pBindingHandle, IN LPWSTR pwszEndpoint, IN LPWSTR pwszOptions )/*++
This function uses the parameters supplied and generates a lpc binding handle for RPC.
Arguments: pBindingHandle pointer to location which will contain binding handle on successful return pwszEndpoint pointer to string containing the lpc Endpoint pwszOptions pointer to string containing any additional options for binding.
Returns: RPC_STATUS - RPC_S_OK on success Also on success, the binding handle is stored in pBindingHandle. It should freed after usage, using the RpcBindingFree() function.
--*/{ RPC_STATUS rpcStatus; LPWSTR pwszBinding = NULL;
if ( pBindingHandle != NULL) {
*pBindingHandle = NULL; // init the value
}
//
// Compose the binding string for named pipe binding
//
rpcStatus = RpcStringBindingComposeW(0, // ObjUuid
L"ncalrpc", // prot seq: lpc
NULL, // NetworkAddr
pwszEndpoint, // Endpoint
pwszOptions, // Options
&pwszBinding); // StringBinding
if ( rpcStatus == RPC_S_OK ) {
//
// establish the binding handle using string binding.
//
rpcStatus = RpcBindingFromStringBindingW(pwszBinding, pBindingHandle ); }
//
// Cleanup and return back.
//
if ( pwszBinding != NULL) { RpcStringFreeW(&pwszBinding); }
if ( rpcStatus != RPC_S_OK) {
if ( pBindingHandle != NULL && *pBindingHandle != NULL) {
// RPC should have freed the binding handle.
// We will free it now.
RpcBindingFree(pBindingHandle); *pBindingHandle = NULL; } }
return (rpcStatus);
} // RpcBindHandleOverLpc()
#ifndef CHICAGO
//
// If changes are made to the NT version, check out the windows 95
// version located right after this routine and see if the change
// needs to be propagated there too.
//
RPC_STATUSRpcBindHandleOverTcpIp( OUT handle_t * pBindingHandle, IN LPWSTR pwszServerName, IN LPWSTR pwszInterfaceName )/*++
NT Version
This function uses the parameters supplied and generates a dynamic end point binding handle for RPC over TCP/IP.
Arguments: pBindingHandle pointer to location which will contain binding handle on successful return pwszServerName pointer to string containing the name of the server to which, this function will obtain a binding. pwszInterfaceName pointer to string containing the interface name
Returns: RPC_STATUS - RPC_S_OK on success Also on success, the binding handle is stored in pBindingHandle. It should freed after usage, using the RpcBindingFree() function.
--*/{ RPC_STATUS rpcStatus; LPWSTR pwszBinding = NULL;
if ( pBindingHandle != NULL) {
*pBindingHandle = NULL; // init the value
} else return RPC_S_INVALID_BINDING;
//
// Compose the binding string for named pipe binding
//
rpcStatus = RpcStringBindingComposeW(0, // ObjUuid
L"ncacn_ip_tcp", // tcpip seq
pwszServerName, // NetworkAddr
NULL, // Endpoint
L"", // Options
&pwszBinding); // StringBinding
DBGPRINTF( (DBG_CONTEXT, "\nRpcStringBindingComposeW(%S, %S) return %S." " Error = %ld\n", L"ncacn_ip_tcp", pwszServerName, pwszBinding, rpcStatus) );
if ( rpcStatus == RPC_S_OK ) {
//
// establish the binding handle using string binding.
//
rpcStatus = RpcBindingFromStringBindingW(pwszBinding, pBindingHandle );
DBGPRINTF( (DBG_CONTEXT, "RpcBindingFromStringBindingW(%S) return %d." "Binding=%p\n", pwszBinding, rpcStatus, *pBindingHandle) ); }
if ( rpcStatus == RPC_S_OK) {
//
// set up the security information
//
rpcStatus = RpcBindingSetAuthInfoW(*pBindingHandle, pwszInterfaceName, // pszPrincipalName
RPC_C_AUTHN_LEVEL_CONNECT, RPC_C_AUTHN_WINNT, NULL, // AuthnIdentity
0 // AuthzSvc
); DBGPRINTF( (DBG_CONTEXT, "RpcBindingSetAuthInfo(%S(Interface=%S), %p)" " return %d.\n", pwszBinding, pwszInterfaceName, *pBindingHandle, rpcStatus ) );
}
//
// Cleanup and return back.
//
if ( pwszBinding != NULL) {
DWORD rpcStatus1 = RpcStringFreeW(&pwszBinding); DBGPRINTF( (DBG_CONTEXT, "RpcStringFreeW() returns %d.", rpcStatus1) );
}
if ( rpcStatus != RPC_S_OK) {
if ( pBindingHandle != NULL && *pBindingHandle != NULL) {
// RPC should have freed the binding handle.
// We will free it now.
DWORD rpcStatus1 = RpcBindingFree(pBindingHandle); DBGPRINTF( (DBG_CONTEXT, "RpcBindingFree() returns %d.\n", rpcStatus1) ); *pBindingHandle = NULL; } }
return (rpcStatus);
} // RpcBindHandleOverTcpIp()
#else // CHICAGO
RPC_STATUSRpcBindHandleOverTcpIp( OUT handle_t * pBindingHandle, IN LPWSTR pwszServerName, IN LPWSTR pwszInterfaceName )/*++
Windows 95 version
This function uses the parameters supplied and generates a dynamic end point binding handle for RPC over TCP/IP.
Arguments: pBindingHandle pointer to location which will contain binding handle on successful return pwszServerName pointer to string containing the name of the server to which, this function will obtain a binding. pwszInterfaceName pointer to string containing the interface name
Returns: RPC_STATUS - RPC_S_OK on success Also on success, the binding handle is stored in pBindingHandle. It should freed after usage, using the RpcBindingFree() function.
--*/{ RPC_STATUS rpcStatus; LPSTR pszBindingA = NULL; CHAR szServerA[MAX_PATH]; CHAR szInterfaceA[MAX_PATH]; int cch;
if ( pBindingHandle != NULL) {
*pBindingHandle = NULL; // init the value
} else return RPC_S_INVALID_BINDING;
*szServerA = '0';
if (pwszServerName) cch = WideCharToMultiByte(CP_ACP, 0, pwszServerName, -1, szServerA, sizeof(szServerA)/sizeof(CHAR), NULL,NULL );
*szInterfaceA = '0';
if(pwszInterfaceName) cch = WideCharToMultiByte(CP_ACP, 0, pwszInterfaceName, -1, szInterfaceA, sizeof(szInterfaceA)/sizeof(CHAR), NULL,NULL );
//
// Compose the binding string for named pipe binding
//
rpcStatus = RpcStringBindingCompose(0, // ObjUuid
"ncacn_ip_tcp", // tcpip seq
szServerA, // NetworkAddr
NULL, // Endpoint
NULL, //L"", // Options
&pszBindingA); // StringBinding
DBGPRINTF( (DBG_CONTEXT, "\nRpcStringBindingCompose(%s, %s) return %s." " Error = %ld\n", "ncacn_ip_tcp", szServerA, pszBindingA, rpcStatus) );
if ( rpcStatus == RPC_S_OK ) {
//
// establish the binding handle using string binding.
//
rpcStatus = RpcBindingFromStringBinding(pszBindingA, pBindingHandle );
DBGPRINTF( (DBG_CONTEXT, "RpcBindingFromStringBinding(%s) return %d." "Binding=%p\n", pszBindingA, rpcStatus, *pBindingHandle) ); }
if ( rpcStatus == RPC_S_OK) {
//
// set up the security information
//
rpcStatus = RpcBindingSetAuthInfo(*pBindingHandle, szInterfaceA, // pszPrincipalName
RPC_C_AUTHN_LEVEL_CONNECT, RPC_C_AUTHN_WINNT, NULL, // AuthnIdentity
0 // AuthzSvc
); DBGPRINTF( (DBG_CONTEXT, "RpcBindingSetAuthInfo(%s(Interface=%s), %p)" " return %d.\n", pszBindingA, szInterfaceA, *pBindingHandle, rpcStatus ) );
}
//
// Cleanup and return back.
//
if ( pszBindingA != NULL) {
DWORD rpcStatus1 = RpcStringFree(&pszBindingA); DBGPRINTF( (DBG_CONTEXT, "RpcStringFreeW() returns %d.", rpcStatus1) );
}
if ( rpcStatus != RPC_S_OK) {
if ( pBindingHandle != NULL && *pBindingHandle != NULL) {
// RPC should have freed the binding handle.
// We will free it now.
DWORD rpcStatus1 = RpcBindingFree(pBindingHandle); DBGPRINTF( (DBG_CONTEXT, "RpcBindingFree() returns %d.\n", rpcStatus1) ); *pBindingHandle = NULL; } }
return (rpcStatus);
} // RpcBindHandleOverTcpIp()
#endif
#ifndef CHICAGO
DWORDRpcuFindProtocolToUse( IN LPCWSTR pwszServerName)/*++
Given the server name this funciton determines the protocol to use for RPC binding.
The transport used is determined dynamically based on following rules.
If server name is NULL or 127.0.0.1 or same as local computer name then use the LPC.
If server name starts with a leading "\\" (double slash), then attempt RPC binding over NamedPipe.
If server name does not start with leading "\\", then attempt RPC binding over TCPIP.
If TCPIP binding fails, then this function tries binding over NamedPipe.
Argument: pwszServerName - pointer to string containing the name of the server
Returns: DWORD containing the type of protocol to use.
--*/{ static WCHAR g_wchLocalMachineName[ MAX_COMPUTERNAME_LENGTH + 1]; BOOL fLeadingSlashes; DWORD dwBindProtocol = ISRPC_CLIENT_OVER_NP; BOOL fLocalMachine;
if ( pwszServerName == NULL || _wcsicmp( L"127.0.0.1", pwszServerName) == 0) {
return (ISRPC_CLIENT_OVER_LPC); }
if ( g_wchLocalMachineName[0] == L'\0') {
DWORD cchComputerNameLen = MAX_COMPUTERNAME_LENGTH+1;
//
// Obtain the local computer name
//
if (!GetComputerNameW( g_wchLocalMachineName, &cchComputerNameLen) ) {
*g_wchLocalMachineName = L'\0'; } }
fLeadingSlashes = ((*pwszServerName == L'\\') && (*(pwszServerName+1) == L'\\') );
//
// Check to see if machine name matches local computer name
// if so, use LPC
//
fLocalMachine = !_wcsicmp( g_wchLocalMachineName, ((fLeadingSlashes) ? (pwszServerName + 2) : pwszServerName) );
if ( fLocalMachine) {
return (ISRPC_CLIENT_OVER_LPC); }
if ( !fLeadingSlashes) {
DWORD nDots; LPCWSTR pszName;
//
// Check if the name has dotted decimal name.
// If so then suggest TCP binding.
//
for( nDots = 0, pszName = pwszServerName; ((pszName = wcschr( pszName, L'.' )) != NULL); nDots++, pszName++) ;
if ( nDots == 3) {
//
// if the string has 3 DOTs exactly then this string must represent
// an IpAddress.
//
return(ISRPC_CLIENT_OVER_TCPIP); } }
return ( ISRPC_CLIENT_OVER_NP);} // RpcuFindProtocolToUse()
#endif
RPC_STATUSRpcBindHandleForServer( OUT handle_t * pBindingHandle, IN LPWSTR pwszServerName, IN LPWSTR pwszInterfaceName, IN LPWSTR pwszOptions )/*++
This function uses the parameters supplied and generates a binding handle for RPC.
It is assumed that binding over named pipe uses static end point with the interface name and options as provided.
Arguments: pBindingHandle pointer to location which will contain binding handle on successful return pwszServerName pointer to string containing the name of the server to which, this function will obtain a binding. pwszInterfaceName pointer to string containing the interface name pwszOptions pointer to string containing any additional options for binding.
Returns: RPC_STATUS - RPC_S_OK on success Also on success, the binding handle is stored in pBindingHandle. It should freed after usage, using the RpcBindingFree() function.
--*/{ RPC_STATUS rpcStatus = RPC_S_SERVER_UNAVAILABLE; LPWSTR pwszBinding = NULL; DWORD dwBindProtocol = 0;
if ( pBindingHandle != NULL) {
*pBindingHandle = NULL; // init the value
} else return RPC_S_INVALID_BINDING;
#ifndef CHICAGO
dwBindProtocol = RpcuFindProtocolToUse( pwszServerName);#else
dwBindProtocol = ISRPC_CLIENT_OVER_TCPIP;#endif
switch ( dwBindProtocol) {
case ISRPC_CLIENT_OVER_LPC: {
WCHAR rgchLpc[1024];
//
// generate a LPC end point name from the interface name.
// the End point = <InterfaceName>_LPC
//
if ( lstrlenW( pwszInterfaceName) >= ( sizeof(rgchLpc)/sizeof(WCHAR) - 6)) {
SetLastError( ERROR_INVALID_PARAMETER); return ( ERROR_INVALID_PARAMETER); }
lstrcpyW( rgchLpc, pwszInterfaceName); lstrcatW( rgchLpc, L"_LPC");
//
// Attempt binding over static LPC.
//
rpcStatus = RpcBindHandleOverLpc( pBindingHandle, rgchLpc, pwszOptions );
DBGPRINTF(( DBG_CONTEXT, " RpcBindingOverLpc(%S) returns %d." " Handle = %p\n", pwszServerName, rpcStatus, *pBindingHandle));
break; }
case ISRPC_CLIENT_OVER_TCPIP:
// # ifdef RPC_BIND_OVER_TCP
//
// Attempt binding over TCPIP using Dynamic Endpoint.
//
rpcStatus = RpcBindHandleOverTcpIp( pBindingHandle, pwszServerName, pwszInterfaceName);
DBGPRINTF(( DBG_CONTEXT, " RpcBindingOverTcpIp(%S) returns %d. Handle = %p\n", pwszServerName, rpcStatus, *pBindingHandle));
if ( rpcStatus == RPC_S_OK) {
break; // done with RPC binding over TCP
}
// Fall Through
// # endif // RPC_BIND_OVER_TCP
case ISRPC_CLIENT_OVER_NP: { WCHAR rgchNp[1024];
//
// generate a NamedPipe end point name from the interface name.
// the End point = \PIPE\<InterfaceName>
//
lstrcpyW( rgchNp, L"\\PIPE\\"); if ( lstrlenW( pwszInterfaceName) >= ( sizeof(rgchNp)/sizeof(WCHAR) - 10)) {
SetLastError( ERROR_INVALID_PARAMETER); return ( ERROR_INVALID_PARAMETER); }
lstrcatW( rgchNp, pwszInterfaceName);
//
// Attempt binding over static NamedPipe.
//
rpcStatus = RpcBindHandleOverNamedPipe( pBindingHandle, pwszServerName, rgchNp, pwszOptions );
DBGPRINTF(( DBG_CONTEXT, " RpcBindingOverNamedPipe(%S) returns %d." " Handle = %p\n", pwszServerName, rpcStatus, *pBindingHandle)); break; }
default: break;
} // switch()
return ( rpcStatus);
} // RpcBindHandleForServer()
RPC_STATUSRpcBindHandleFree(IN OUT handle_t * pBindingHandle)/*++
Description:
This function frees up the binding handle allocated using RpcBindHandleForServer(). It uses RPC Binding Free routing to do this. This function acts just as a thunk so that the alloc/free of RPC contexts are consolidated within this module.
Arguments: pBindingHandle pointer to RPC binding handle that needs to be freed.
Returns: RPC_STATUS - containig the RPC status. RPC_S_OK for success.
--*/{
return ( RpcBindingFree( pBindingHandle));
} // RpcBindHandleFree()
/************************ End of File ***********************/
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