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np: NPAddConnection: support file systems not managed by the launcher

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This commit is contained in:
Bill Zissimopoulos
2026-02-03 21:03:04 +02:00
parent 2aa682ffa1
commit f021496302
1 changed files with 53 additions and 0 deletions
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53
src/dll/np.c
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@@ -454,6 +454,41 @@ exit:
return NpResult;
}
static BOOLEAN FspNpCheckRemoteVolume(PWSTR RemoteName)
{
PWSTR ClassName, InstanceName, P;
ULONG ClassNameLen, InstanceNameLen;
WCHAR RemoteNameBuf[9 + sizeof(((FSP_FSCTL_VOLUME_PARAMS *)0)->Prefix) / sizeof(WCHAR)];
HANDLE Handle;
DWORD Bytes;
BOOLEAN Result;
if (!FspNpParseRemoteName(RemoteName,
&ClassName, &ClassNameLen, &InstanceName, &InstanceNameLen))
return FALSE;
Result = FALSE;
P = RemoteNameBuf;
*P++ = L'\\'; *P++ = L'\\'; *P++ = L'?'; *P++ = L'\\';
*P++ = L'U'; *P++ = L'N'; *P++ = L'C'; *P++ = L'\\';
memcpy(P, ClassName, ClassNameLen * sizeof(WCHAR)); P += ClassNameLen; *P++ = L'\\';
memcpy(P, InstanceName, InstanceNameLen * sizeof(WCHAR)); P += InstanceNameLen; *P++ = L'\\';
*P++ = L'\0';
Handle = CreateFileW(RemoteNameBuf,
FILE_READ_ATTRIBUTES, 0, 0, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0);
if (INVALID_HANDLE_VALUE != Handle)
{
/* the file system is up and running; is it WinFsp? */
if (DeviceIoControl(Handle, FSP_FSCTL_QUERY_WINFSP, 0, 0, 0, 0, &Bytes, 0))
Result = TRUE;
CloseHandle(Handle);
}
return Result;
}
DWORD APIENTRY NPGetConnection(
LPWSTR lpLocalName, LPWSTR lpRemoteName, LPDWORD lpnBufferLen)
{
@@ -573,7 +608,16 @@ DWORD APIENTRY NPAddConnection(LPNETRESOURCEW lpNetResource, LPWSTR lpPassword,
NpResult = FspNpGetRemoteInfo(lpRemoteName, 0, &CredentialsKind, &AllowImpersonation);
if (WN_SUCCESS != NpResult)
{
/*
* This may still be a WinFsp network file system, but not managed by the Launcher.
* So if it is already live, one of ours and we do not need to map a drive, then go
* ahead and report success.
*/
if (L'\0' == LocalNameBuf[0] && FspNpCheckRemoteVolume(lpRemoteName))
NpResult = WN_SUCCESS;
return NpResult;
}
#if defined(FSP_NP_CREDENTIAL_MANAGER)
/* if we need credentials and none were passed check with the credential manager */
@@ -720,6 +764,15 @@ DWORD APIENTRY NPAddConnection(LPNETRESOURCEW lpNetResource, LPWSTR lpPassword,
/* we are not being asked for a drive mapping, so whatever we have is good! */
NpResult = WN_SUCCESS;
break;
case WN_NO_NETWORK:
/*
* This may still be a WinFsp network file system, but not managed by the Launcher.
* So if it is already live, one of ours and we do not need to map a drive, then go
* ahead and report success.
*/
if (L'\0' == LocalNameBuf[0] && FspNpCheckRemoteVolume(lpRemoteName))
NpResult = WN_SUCCESS;
break;
default:
NpResult = WN_NO_NETWORK;
break;