newlib/winsup/cygwin/fhandler_netdrive.cc

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/* fhandler_netdrive.cc: fhandler for // and //MACHINE handling
Copyright 2005 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <unistd.h>
#include <stdlib.h>
#include <sys/cygwin.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "sigproc.h"
#include "cygthread.h"
#include <assert.h>
#include <winnetwk.h>
#include <dirent.h>
enum
{
GET_RESOURCE_INFO = 0,
GET_RESOURCE_OPENENUM = 1,
GET_RESOURCE_OPENENUMTOP = 2,
GET_RESOURCE_ENUM = 3
};
struct netdriveinf
{
int what;
int ret;
PVOID in;
PVOID out;
DWORD outsize;
HANDLE sem;
};
static DWORD WINAPI
thread_netdrive (void *arg)
{
netdriveinf *ndi = (netdriveinf *) arg;
LPTSTR dummy = NULL;
LPNETRESOURCE nro, nro2;
DWORD size;
HANDLE enumhdl;
ReleaseSemaphore (ndi->sem, 1, NULL);
switch (ndi->what)
{
case GET_RESOURCE_INFO:
nro = (LPNETRESOURCE) alloca (size = 4096);
ndi->ret = WNetGetResourceInformation ((LPNETRESOURCE) ndi->in,
nro, &size, &dummy);
break;
case GET_RESOURCE_OPENENUM:
case GET_RESOURCE_OPENENUMTOP:
nro = (LPNETRESOURCE) alloca (size = 4096);
ndi->ret = WNetGetResourceInformation ((LPNETRESOURCE) ndi->in,
nro, &size, &dummy);
if (ndi->ret != NO_ERROR)
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break;
if (ndi->what == GET_RESOURCE_OPENENUMTOP)
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{
nro2 = nro;
nro = (LPNETRESOURCE) alloca (size = 4096);
ndi->ret = WNetGetResourceParent (nro2, nro, &size);
if (ndi->ret != NO_ERROR)
break;
}
ndi->ret = WNetOpenEnum (RESOURCE_GLOBALNET, RESOURCETYPE_DISK, 0, nro,
&enumhdl);
if (ndi->ret == NO_ERROR)
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*(HANDLE *) ndi->out = enumhdl;
break;
case GET_RESOURCE_ENUM:
ndi->ret = WNetEnumResource ((HANDLE) ndi->in, (size = 1, &size),
(LPNETRESOURCE) ndi->out, &ndi->outsize);
break;
}
ReleaseSemaphore (ndi->sem, 1, NULL);
return 0;
}
static DWORD
create_thread_and_wait (int what, PVOID in, PVOID out, DWORD outsize,
const char *name)
{
netdriveinf ndi = { what, 0, in, out, outsize,
CreateSemaphore (&sec_none_nih, 0, 2, NULL) };
cygthread *thr = new cygthread (thread_netdrive, 0, &ndi, name);
if (thr->detach (ndi.sem))
ndi.ret = ERROR_OPERATION_ABORTED;
CloseHandle (ndi.sem);
return ndi.ret;
}
/* Returns 0 if path doesn't exist, >0 if path is a directory,
-1 if path is a file, -2 if it's a symlink. */
int
fhandler_netdrive::exists ()
{
char *to;
const char *from;
size_t len = strlen (get_name ());
if (len == 2)
return 1;
char namebuf[len + 1];
for (to = namebuf, from = get_name (); *from; to++, from++)
*to = (*from == '/') ? '\\' : *from;
*to = '\0';
NETRESOURCE nr = {0};
nr.dwScope = RESOURCE_GLOBALNET;
nr.dwType = RESOURCETYPE_DISK;
nr.lpLocalName = NULL;
nr.lpRemoteName = namebuf;
DWORD ret = create_thread_and_wait (GET_RESOURCE_INFO, &nr, NULL, 0,
"WNetGetResourceInformation");
if (ret != ERROR_MORE_DATA && ret != NO_ERROR)
return 0;
return 1;
}
fhandler_netdrive::fhandler_netdrive ():
fhandler_virtual ()
{
}
int
fhandler_netdrive::fstat (struct __stat64 *buf)
{
const char *path = get_name ();
debug_printf ("fstat (%s)", path);
fhandler_base::fstat (buf);
buf->st_mode = S_IFDIR | STD_RBITS | STD_XBITS;
buf->st_ino = get_namehash ();
return 0;
}
int
fhandler_netdrive::readdir (DIR *dir, dirent *de)
{
DWORD size;
NETRESOURCE *nro;
DWORD ret;
int res;
if (!dir->__d_position)
{
size_t len = strlen (get_name ());
char *namebuf;
NETRESOURCE nr = { 0 };
if (len == 2) /* // */
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{
namebuf = (char *) alloca (MAX_COMPUTERNAME_LENGTH + 3);
strcpy (namebuf, "\\\\");
size = MAX_COMPUTERNAME_LENGTH + 1;
if (!GetComputerName (namebuf + 2, &size))
{
res = geterrno_from_win_error ();
goto out;
}
}
else
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{
const char *from;
char *to;
namebuf = (char *) alloca (len + 1);
for (to = namebuf, from = get_name (); *from; to++, from++)
*to = (*from == '/') ? '\\' : *from;
*to = '\0';
}
nr.lpRemoteName = namebuf;
nr.dwType = RESOURCETYPE_DISK;
nro = (NETRESOURCE *) alloca (4096);
ret = create_thread_and_wait (len == 2 ? GET_RESOURCE_OPENENUMTOP
: GET_RESOURCE_OPENENUM,
&nr, &dir->__handle, 0, "WNetOpenEnum");
if (ret != NO_ERROR)
{
dir->__handle = INVALID_HANDLE_VALUE;
res = geterrno_from_win_error (ret);
goto out;
}
}
ret = create_thread_and_wait (GET_RESOURCE_ENUM, dir->__handle,
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nro = (LPNETRESOURCE) alloca (16384),
16384, "WnetEnumResource");
if (ret != NO_ERROR)
res = geterrno_from_win_error (ret);
else
{
dir->__d_position++;
char *bs = strrchr (nro->lpRemoteName, '\\');
strcpy (de->d_name, bs ? bs + 1 : nro->lpRemoteName);
if (strlen (get_name ()) == 2)
de->d_ino = hash_path_name (get_namehash (), de->d_name);
else
de->d_ino = readdir_get_ino (dir, nro->lpRemoteName, false);
res = 0;
}
out:
syscall_printf ("%d = readdir (%p, %p)", res, dir, de);
return res;
}
void
fhandler_netdrive::seekdir (DIR *dir, _off64_t pos)
{
rewinddir (dir);
if (pos < 0)
return;
while (dir->__d_position < pos)
if (!readdir (dir, dir->__d_dirent))
break;
}
void
fhandler_netdrive::rewinddir (DIR *dir)
{
if (dir->__handle != INVALID_HANDLE_VALUE)
WNetCloseEnum (dir->__handle);
dir->__handle = INVALID_HANDLE_VALUE;
return fhandler_virtual::rewinddir (dir);
}
int
fhandler_netdrive::closedir (DIR *dir)
{
rewinddir (dir);
return fhandler_virtual::closedir (dir);
}
int
fhandler_netdrive::open (int flags, mode_t mode)
{
int res = fhandler_virtual::open (flags, mode);
if (!res)
goto out;
nohandle (true);
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
{
set_errno (EEXIST);
res = 0;
goto out;
}
else if (flags & O_WRONLY)
{
set_errno (EISDIR);
res = 0;
goto out;
}
res = 1;
set_flags ((flags & ~O_TEXT) | O_BINARY | O_DIROPEN);
set_open_status ();
out:
syscall_printf ("%d = fhandler_netdrive::open (%p, %d)", res, flags, mode);
return res;
}