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#define SYMLINK_FLAG_RELATIVE 1
typedef struct _REPARSE_DATA_BUFFER {
ULONG ReparseTag;
USHORT ReparseDataLength;
USHORT Reserved;
union {
struct {
USHORT SubstituteNameOffset;
USHORT SubstituteNameLength;
USHORT PrintNameOffset;
USHORT PrintNameLength;
ULONG Flags;
WCHAR PathBuffer[1];
} SymbolicLinkReparseBuffer;
struct {
USHORT SubstituteNameOffset;
USHORT SubstituteNameLength;
USHORT PrintNameOffset;
USHORT PrintNameLength;
WCHAR PathBuffer[1];
} MountPointReparseBuffer;
struct {
UCHAR DataBuffer[1];
} GenericReparseBuffer;
};
} REPARSE_DATA_BUFFER, *PREPARSE_DATA_BUFFER;
bool CreateReparsePoint(CommandData *Cmd,const wchar *Name,FileHeader *hd)
{
static bool PrivSet=false;
if (!PrivSet)
{
SetPrivilege(SE_RESTORE_NAME);
// Not sure if we really need it, but let's request anyway.
SetPrivilege(SE_CREATE_SYMBOLIC_LINK_NAME);
PrivSet=true;
}
const std::wstring &SubstName=hd->RedirName;
size_t SubstLength=SubstName.size();
// REPARSE_DATA_BUFFER receives both SubstName and PrintName strings,
// thus "*2" below. PrintName is either shorter or same length as SubstName.
const DWORD BufSize=sizeof(REPARSE_DATA_BUFFER)+((DWORD)SubstLength+1)*2*sizeof(wchar);
std::vector<byte> Buf(BufSize);
REPARSE_DATA_BUFFER *rdb=(REPARSE_DATA_BUFFER *)Buf.data();
// Remove \??\ NTFS junction prefix of present.
bool WinPrefix=SubstName.rfind(L"\\??\\",0)!=std::wstring::npos;
std::wstring PrintName=WinPrefix ? SubstName.substr(4):SubstName;
if (WinPrefix && PrintName.rfind(L"UNC\\",0)!=std::wstring::npos)
PrintName=L"\\"+PrintName.substr(3); // Convert UNC\server\share to \\server\share.
size_t PrintLength=PrintName.size();
bool AbsPath=WinPrefix;
// IsFullPath is not really needed here, AbsPath check is enough.
// We added it just for extra safety, in case some Windows version would
// allow to create absolute targets with SYMLINK_FLAG_RELATIVE.
// Use hd->FileName instead of Name, since Name can include the destination
// path as a prefix, which can confuse IsRelativeSymlinkSafe algorithm.
if (!Cmd->AbsoluteLinks && (AbsPath || IsFullPath(hd->RedirName) ||
!IsRelativeSymlinkSafe(Cmd,hd->FileName,Name,hd->RedirName)))
{
uiMsg(UIERROR_SKIPUNSAFELINK,hd->FileName,hd->RedirName);
ErrHandler.SetErrorCode(RARX_WARNING);
return false;
}
CreatePath(Name,true,Cmd->DisableNames);
// Overwrite prompt was already issued and confirmed earlier, so we can
// remove existing symlink or regular file here. PrepareToDelete was also
// called earlier inside of uiAskReplaceEx.
if (FileExist(Name))
if (IsDir(GetFileAttr(Name)))
DelDir(Name);
else
DelFile(Name);
// 'DirTarget' check is important for Unix symlinks to directories.
// Unix symlinks do not have their own 'directory' attribute.
if (hd->Dir || hd->DirTarget)
{
if (!CreateDir(Name))
{
uiMsg(UIERROR_DIRCREATE,L"",Name);
ErrHandler.SetErrorCode(RARX_CREATE);
return false;
}
}
else
{
HANDLE hFile=CreateFile(Name,GENERIC_WRITE,0,NULL,CREATE_NEW,FILE_ATTRIBUTE_NORMAL,NULL);
if (hFile == INVALID_HANDLE_VALUE)
{
ErrHandler.CreateErrorMsg(Name);
return false;
}
CloseHandle(hFile);
}
if (hd->RedirType==FSREDIR_JUNCTION)
{
rdb->ReparseTag=IO_REPARSE_TAG_MOUNT_POINT;
rdb->ReparseDataLength=USHORT(
sizeof(rdb->MountPointReparseBuffer.SubstituteNameOffset)+
sizeof(rdb->MountPointReparseBuffer.SubstituteNameLength)+
sizeof(rdb->MountPointReparseBuffer.PrintNameOffset)+
sizeof(rdb->MountPointReparseBuffer.PrintNameLength)+
(SubstLength+1)*sizeof(WCHAR)+(PrintLength+1)*sizeof(WCHAR));
rdb->Reserved=0;
rdb->MountPointReparseBuffer.SubstituteNameOffset=0;
rdb->MountPointReparseBuffer.SubstituteNameLength=USHORT(SubstLength*sizeof(WCHAR));
wcscpy(rdb->MountPointReparseBuffer.PathBuffer,SubstName.data());
rdb->MountPointReparseBuffer.PrintNameOffset=USHORT((SubstLength+1)*sizeof(WCHAR));
rdb->MountPointReparseBuffer.PrintNameLength=USHORT(PrintLength*sizeof(WCHAR));
wcscpy(rdb->MountPointReparseBuffer.PathBuffer+SubstLength+1,PrintName.data());
}
else
if (hd->RedirType==FSREDIR_WINSYMLINK || hd->RedirType==FSREDIR_UNIXSYMLINK)
{
rdb->ReparseTag=IO_REPARSE_TAG_SYMLINK;
rdb->ReparseDataLength=USHORT(
sizeof(rdb->SymbolicLinkReparseBuffer.SubstituteNameOffset)+
sizeof(rdb->SymbolicLinkReparseBuffer.SubstituteNameLength)+
sizeof(rdb->SymbolicLinkReparseBuffer.PrintNameOffset)+
sizeof(rdb->SymbolicLinkReparseBuffer.PrintNameLength)+
sizeof(rdb->SymbolicLinkReparseBuffer.Flags)+
(SubstLength+1)*sizeof(WCHAR)+(PrintLength+1)*sizeof(WCHAR));
rdb->Reserved=0;
rdb->SymbolicLinkReparseBuffer.SubstituteNameOffset=0;
rdb->SymbolicLinkReparseBuffer.SubstituteNameLength=USHORT(SubstLength*sizeof(WCHAR));
wcscpy(rdb->SymbolicLinkReparseBuffer.PathBuffer,SubstName.data());
rdb->SymbolicLinkReparseBuffer.PrintNameOffset=USHORT((SubstLength+1)*sizeof(WCHAR));
rdb->SymbolicLinkReparseBuffer.PrintNameLength=USHORT(PrintLength*sizeof(WCHAR));
wcscpy(rdb->SymbolicLinkReparseBuffer.PathBuffer+SubstLength+1,PrintName.data());
rdb->SymbolicLinkReparseBuffer.Flags=AbsPath ? 0:SYMLINK_FLAG_RELATIVE;
}
else
return false;
HANDLE hFile=CreateFile(Name,GENERIC_READ|GENERIC_WRITE,0,NULL,
OPEN_EXISTING,FILE_FLAG_OPEN_REPARSE_POINT|
FILE_FLAG_BACKUP_SEMANTICS,NULL);
if (hFile==INVALID_HANDLE_VALUE)
{
ErrHandler.CreateErrorMsg(Name);
ErrHandler.SetErrorCode(RARX_CREATE);
return false;
}
DWORD Returned;
if (!DeviceIoControl(hFile,FSCTL_SET_REPARSE_POINT,rdb,
FIELD_OFFSET(REPARSE_DATA_BUFFER,GenericReparseBuffer)+
rdb->ReparseDataLength,NULL,0,&Returned,NULL))
{
CloseHandle(hFile);
uiMsg(UIERROR_SLINKCREATE,L"",Name);
DWORD LastError=GetLastError();
if ((LastError==ERROR_ACCESS_DENIED || LastError==ERROR_PRIVILEGE_NOT_HELD) &&
!IsUserAdmin())
uiMsg(UIERROR_NEEDADMIN);
ErrHandler.SysErrMsg();
ErrHandler.SetErrorCode(RARX_CREATE);
if (hd->Dir)
RemoveDirectory(Name);
else
DeleteFile(Name);
return false;
}
File LinkFile;
LinkFile.SetHandle(hFile);
LinkFile.SetOpenFileTime(
Cmd->xmtime==EXTTIME_NONE ? NULL:&hd->mtime,
Cmd->xctime==EXTTIME_NONE ? NULL:&hd->ctime,
Cmd->xatime==EXTTIME_NONE ? NULL:&hd->atime);
LinkFile.Close();
if (!Cmd->IgnoreGeneralAttr)
SetFileAttr(Name,hd->FileAttr);
return true;
}
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