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Cygwin: fhandler_netdrive: fix character conversion required for NFS shares

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While filenames on NFS shares are converted internally to a widechar
representation of the input bytes treated as the default system ANSI
codepage (CP_ACP), this doesn't hold for share names.  The names
returned by WNetEnumResourceW are just the original bytes dropped
verbatim into WCHAR.

The original conversion from 7db1c6fc4e2a ("Cygwin: //server: revert
to using WNet and support NFS shares") was erroneous in that it
treated the bytes as ISO-8859-1, not as CP_ACP codepoints.

Fix the conversion to convert from CP_ACP to widechar.  Use a tmp_pathbuf
buffer for the new widechar string instead of malloc/free.  Extend the
comment, better explaining the encoding difference between files and
shares.

Fixes: 7db1c6fc4e2a ("Cygwin: //server: revert to using WNet and support NFS shares")
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2025-02-27 13:51:39 +01:00
parent dc094c7665
commit d4a5c2be8b
1 changed files with 17 additions and 12 deletions
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29
winsup/cygwin/fhandler/netdrive.cc
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@ -317,6 +317,7 @@ thread_netdrive_wnet (void *arg)
size_t entry_cache_size = DIR_cache.count ();
WCHAR provider[256], *dummy = NULL;
wchar_t srv_name[CYG_MAX_PATH];
wchar_t *nfs_namebuf = NULL;
NETRESOURCEW nri = { 0 };
LPNETRESOURCEW nro;
NETINFOSTRUCT netinfo;
@ -397,6 +398,10 @@ thread_netdrive_wnet (void *arg)
ndi->err = ENOENT;
goto out;
}
/* We need a temporary buffer for the multibyte to widechar conversion
only required for NFS shares. */
if (!nfs_namebuf)
nfs_namebuf = tp.w_get ();
break;
case WNNC_NET_DAV:
/* WebDAV enumeration isn't supported, by the provider, but we can
@ -447,19 +452,21 @@ thread_netdrive_wnet (void *arg)
if (net_type == WNNC_NET_MS_NFS)
{
wchar_t *nm = name;
/* Convert from "ANSI embedded in widechar" to multibyte and convert
back to widechar. */
/* With MS NFS, the bytes of the share name on the remote side
are simply dropped into a WCHAR buffer without conversion to
Unicode. So convert from "multibyte embedded in widechar" to
real multibyte and then convert back to widechar here.
Quirky: This conversion is already performed for files on an
MS NFS filesystem when calling NtQueryDirectoryFile, but it's
not performed on the strings returned by WNetEnumResourceW. */
char mbname[wcslen (name) + 1];
char *mb = mbname;
while ((*mb++ = *nm++))
while ((*mb++ = *name++))
;
sys_mbstowcs_alloc (&name, HEAP_NOTHEAP, mbname);
if (!name)
{
ndi->err = ENOMEM;
goto out;
}
name = nfs_namebuf;
MultiByteToWideChar (CP_ACP, 0, mbname, -1, name, NT_MAX_PATH);
}
/* Some providers have deep links so convert embedded '\\' to '/' here */
for (wchar_t *bs = name; (bs = wcschr (bs, L'\\')); *bs++ = L'/')
@ -470,8 +477,6 @@ thread_netdrive_wnet (void *arg)
break;
if (cache_idx >= entry_cache_size)
DIR_cache.add (name);
if (net_type == WNNC_NET_MS_NFS)
free (name);
}
out:
if (dom)