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symlink.c
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Wed, Feb 26, 07:43

symlink.c
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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with this
* work for additional information regarding copyright ownership. The ASF
* licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
#include "winutils.h"
//----------------------------------------------------------------------------
// Function: Symlink
//
// Description:
// The main method for symlink command
//
// Returns:
// 0: on success
//
// Notes:
//
int Symlink(__in int argc, __in_ecount(argc) wchar_t *argv[])
{
PWSTR longLinkName = NULL;
PWSTR longFileName = NULL;
DWORD dwErrorCode = ERROR_SUCCESS;
BOOL isDir = FALSE;
DWORD dwRtnCode = ERROR_SUCCESS;
DWORD dwFlag = 0;
int ret = SUCCESS;
if (argc != 3)
{
SymlinkUsage();
return FAILURE;
}
dwErrorCode = ConvertToLongPath(argv[1], &longLinkName);
if (dwErrorCode != ERROR_SUCCESS)
{
ret = FAILURE;
goto SymlinkEnd;
}
dwErrorCode = ConvertToLongPath(argv[2], &longFileName);
if (dwErrorCode != ERROR_SUCCESS)
{
ret = FAILURE;
goto SymlinkEnd;
}
if (wcschr(longLinkName, L'/') != NULL || wcschr(longFileName, L'/') != NULL)
{
// Reject forward-slash separated paths as they result in unusable symlinks.
//
fwprintf(stderr,
L"Rejecting forward-slash separated path which would result in an "
L"unusable symlink: link = %s, target = %s\n", longLinkName, longFileName);
ret = FAILURE;
goto SymlinkEnd;
}
// Check if the the process's access token has the privilege to create
// symbolic links. Without this step, the call to CreateSymbolicLink() from
// users have the privilege to create symbolic links will still succeed.
// This is just an additional step to do the privilege check by not using
// error code from CreateSymbolicLink() method.
//
if (!EnablePrivilege(L"SeCreateSymbolicLinkPrivilege"))
{
fwprintf(stderr,
L"No privilege to create symbolic links.\n");
ret = SYMLINK_NO_PRIVILEGE;
goto SymlinkEnd;
}
if ((dwRtnCode = DirectoryCheck(longFileName, &isDir)) != ERROR_SUCCESS)
{
ReportErrorCode(L"DirectoryCheck", dwRtnCode);
ret = FAILURE;
goto SymlinkEnd;
}
if (isDir)
dwFlag = SYMBOLIC_LINK_FLAG_DIRECTORY;
if (!CreateSymbolicLinkW(longLinkName, longFileName, dwFlag))
{
ReportErrorCode(L"CreateSymbolicLink", GetLastError());
ret = FAILURE;
goto SymlinkEnd;
}
SymlinkEnd:
LocalFree(longLinkName);
LocalFree(longFileName);
return ret;
}
void SymlinkUsage()
{
fwprintf(stdout, L"\
Usage: symlink [LINKNAME] [FILENAME]\n\
Creates a symbolic link\n\
\n\
0 is returned on success.\n\
2 is returned if the user does no have privilege to create symbolic links.\n\
1 is returned for all other errors.\n\
\n\
The default security settings in Windows disallow non-elevated administrators\n\
and all non-administrators from creating symbolic links. The security settings\n\
for symbolic links can be changed in the Local Security Policy management\n\
console.\n");
}

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