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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2020, Microsoft Corporation.
*
* Author(s): Steve French <stfrench@microsoft.com>
* Suresh Jayaraman <sjayaraman@suse.de>
* Jeff Layton <jlayton@kernel.org>
*/
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/inet.h>
#include <linux/ctype.h>
#include "cifsglob.h"
#include "cifsproto.h"
/* extract the host portion of the UNC string */
char *extract_hostname(const char *unc)
{
const char *src;
char *dst, *delim;
unsigned int len;
/* skip double chars at beginning of string */
/* BB: check validity of these bytes? */
if (strlen(unc) < 3)
return ERR_PTR(-EINVAL);
for (src = unc; *src && *src == '\\'; src++)
;
if (!*src)
return ERR_PTR(-EINVAL);
/* delimiter between hostname and sharename is always '\\' now */
delim = strchr(src, '\\');
if (!delim)
return ERR_PTR(-EINVAL);
len = delim - src;
dst = kmalloc((len + 1), GFP_KERNEL);
if (dst == NULL)
return ERR_PTR(-ENOMEM);
memcpy(dst, src, len);
dst[len] = '\0';
return dst;
}
char *extract_sharename(const char *unc)
{
const char *src;
char *delim, *dst;
/* skip double chars at the beginning */
src = unc + 2;
/* share name is always preceded by '\\' now */
delim = strchr(src, '\\');
if (!delim)
return ERR_PTR(-EINVAL);
delim++;
/* caller has to free the memory */
dst = kstrdup(delim, GFP_KERNEL);
if (!dst)
return ERR_PTR(-ENOMEM);
return dst;
}
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