summaryrefslogtreecommitdiffstats
path: root/winsup/cygwin/fhandler_netdrive.cc
blob: 654360f2275254b14a9d76bfcd25d32295234dd3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
/* fhandler_netdrive.cc: fhandler for // and //MACHINE handling

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 <stdlib.h>
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "cygthread.h"
#include "tls_pbuf.h"

#include <dirent.h>

enum
  {
    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;
  };

struct net_hdls
  {
    HANDLE net;
    HANDLE dom;
  };

static DWORD WINAPI
thread_netdrive (void *arg)
{
  netdriveinf *ndi = (netdriveinf *) arg;
  WCHAR provider[256], *dummy = NULL;
  LPNETRESOURCEW nro;
  DWORD cnt, size;
  struct net_hdls *nh;
  tmp_pathbuf tp;

  ReleaseSemaphore (ndi->sem, 1, NULL);
  switch (ndi->what)
    {
    case GET_RESOURCE_OPENENUMTOP:
      nro = (LPNETRESOURCEW) tp.c_get ();
      nh = (struct net_hdls *) ndi->out;
      ndi->ret = WNetGetProviderNameW (WNNC_NET_LANMAN, provider,
				       (size = 256, &size));
      if (ndi->ret != NO_ERROR)
	break;
      memset (nro, 0, sizeof *nro);
      nro->dwScope = RESOURCE_GLOBALNET;
      nro->dwType = RESOURCETYPE_ANY;
      nro->dwDisplayType = RESOURCEDISPLAYTYPE_GROUP;
      nro->dwUsage = RESOURCEUSAGE_RESERVED | RESOURCEUSAGE_CONTAINER;
      nro->lpRemoteName = provider;
      nro->lpProvider = provider;
      ndi->ret = WNetOpenEnumW (RESOURCE_GLOBALNET, RESOURCETYPE_DISK,
				RESOURCEUSAGE_ALL, nro, &nh->net);
      if (ndi->ret != NO_ERROR)
	break;
      while ((ndi->ret = WNetEnumResourceW (nh->net, (cnt = 1, &cnt), nro,
					    (size = NT_MAX_PATH, &size)))
	     == NO_ERROR)
	{
	  ndi->ret = WNetOpenEnumW (RESOURCE_GLOBALNET, RESOURCETYPE_DISK,
				    RESOURCEUSAGE_ALL, nro, &nh->dom);
	  if (ndi->ret == NO_ERROR)
	    break;
	}
      break;
    case GET_RESOURCE_OPENENUM:
      nro = (LPNETRESOURCEW) tp.c_get ();
      nh = (struct net_hdls *) ndi->out;
      ndi->ret = WNetGetProviderNameW (WNNC_NET_LANMAN, provider,
				      (size = 256, &size));
      if (ndi->ret != NO_ERROR)
	break;
      ((LPNETRESOURCEW) ndi->in)->lpProvider = provider;
      ndi->ret = WNetGetResourceInformationW ((LPNETRESOURCEW) ndi->in, nro,
					      (size = NT_MAX_PATH, &size),
					      &dummy);
      if (ndi->ret != NO_ERROR)
	break;
      ndi->ret = WNetOpenEnumW (RESOURCE_GLOBALNET, RESOURCETYPE_DISK,
				RESOURCEUSAGE_ALL, nro, &nh->dom);
      break;
    case GET_RESOURCE_ENUM:
      nh = (struct net_hdls *) ndi->in;
      if (!nh->dom)
	{
	  ndi->ret = ERROR_NO_MORE_ITEMS;
	  break;
	}
      nro = (LPNETRESOURCEW) tp.c_get ();
      while ((ndi->ret = WNetEnumResourceW (nh->dom, (cnt = 1, &cnt),
					    (LPNETRESOURCEW) ndi->out,
					    &ndi->outsize)) != NO_ERROR
	     && nh->net)
	{
	  WNetCloseEnum (nh->dom);
	  nh->dom = NULL;
	  while ((ndi->ret = WNetEnumResourceW (nh->net, (cnt = 1, &cnt), nro,
						(size = NT_MAX_PATH, &size)))
		 == NO_ERROR)
	    {
	      ndi->ret = WNetOpenEnumW (RESOURCE_GLOBALNET, RESOURCETYPE_DISK,
					RESOURCEUSAGE_ALL, nro, &nh->dom);
	      if (ndi->ret == NO_ERROR)
		break;
	    }
	  if (ndi->ret != NO_ERROR)
	    break;
	}
      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, &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.  */
virtual_ftype_t
fhandler_netdrive::exists ()
{
  char *to;
  const char *from;
  size_t len = strlen (get_name ());
  if (len == 2)
    return virt_rootdir;

  char namebuf[len + 1];
  tmp_pathbuf tp;
  PWCHAR name = tp.w_get ();

  for (to = namebuf, from = get_name (); *from; to++, from++)
    *to = (*from == '/') ? '\\' : *from;
  *to = '\0';

  struct net_hdls nh =  { NULL, NULL };
  NETRESOURCEW nr = {0};
  nr.dwType = RESOURCETYPE_DISK;
  sys_mbstowcs (name, NT_MAX_PATH, namebuf);
  nr.lpRemoteName = name;
  DWORD ret = create_thread_and_wait (GET_RESOURCE_OPENENUM,
				      &nr, &nh, 0, "WNetOpenEnum");
  if (nh.dom)
    WNetCloseEnum (nh.dom);
  return ret != NO_ERROR ? virt_none : virt_directory;
}

fhandler_netdrive::fhandler_netdrive ():
  fhandler_virtual ()
{
}

int __reg2
fhandler_netdrive::fstat (struct stat *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_ino ();

  return 0;
}

int
fhandler_netdrive::readdir (DIR *dir, dirent *de)
{
  NETRESOURCEW *nro;
  DWORD ret;
  int res;
  tmp_pathbuf tp;

  if (!dir->__d_position)
    {
      size_t len = strlen (get_name ());
      PWCHAR name = NULL;
      NETRESOURCEW nr = { 0 };
      struct net_hdls *nh;

      if (len != 2)	/* // */
	{
	  const char *from;
	  char *to;
	  char *namebuf = (char *) alloca (len + 1);
	  for (to = namebuf, from = get_name (); *from; to++, from++)
	    *to = (*from == '/') ? '\\' : *from;
	  *to = '\0';
	  name = tp.w_get ();
	  sys_mbstowcs (name, NT_MAX_PATH, namebuf);
	}
      nr.lpRemoteName = name;
      nr.dwType = RESOURCETYPE_DISK;
      nh = (struct net_hdls *) ccalloc (HEAP_FHANDLER, 1, sizeof *nh);
      ret = create_thread_and_wait (len == 2 ? GET_RESOURCE_OPENENUMTOP
					     : GET_RESOURCE_OPENENUM,
				    &nr, nh, 0, "WNetOpenEnum");
      if (ret != NO_ERROR)
	{
	  dir->__handle = INVALID_HANDLE_VALUE;
	  res = geterrno_from_win_error (ret);
	  goto out;
	}
      dir->__handle = (HANDLE) nh;
    }
  nro = (LPNETRESOURCEW) tp.c_get ();
  ret = create_thread_and_wait (GET_RESOURCE_ENUM, dir->__handle, nro,
				NT_MAX_PATH, "WnetEnumResource");
  if (ret != NO_ERROR)
    res = geterrno_from_win_error (ret);
  else
    {
      dir->__d_position++;
      PWCHAR bs = wcsrchr (nro->lpRemoteName, L'\\');
      bs = bs ? bs + 1 : nro->lpRemoteName;
      if (strlen (get_name ()) == 2)
	{
	  UNICODE_STRING ss, ds;
	  
	  tp.u_get (&ds);
	  RtlInitUnicodeString (&ss, bs);
	  RtlDowncaseUnicodeString (&ds, &ss, FALSE);
	  sys_wcstombs (de->d_name, sizeof de->d_name,
			ds.Buffer, ds.Length / sizeof (WCHAR));
	  de->d_ino = hash_path_name (get_ino (), de->d_name);
	}
      else
	{
	  sys_wcstombs (de->d_name, sizeof de->d_name, bs);
	  char *rpath = tp.c_get ();
	  sys_wcstombs (rpath, NT_MAX_PATH, nro->lpRemoteName);
	  de->d_ino = readdir_get_ino (rpath, false);
	  /* We can't trust remote inode numbers of only 32 bit.  That means,
	     remote NT4 NTFS, as well as shares of Samba version < 3.0. */
	  if (de->d_ino <= UINT32_MAX)
	    de->d_ino = hash_path_name (0, rpath);
	}
      de->d_type = DT_DIR;

      res = 0;
    }
out:
  syscall_printf ("%d = readdir(%p, %p)", res, dir, de);
  return res;
}

void
fhandler_netdrive::seekdir (DIR *dir, long 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)
    {
      struct net_hdls *nh = (struct net_hdls *) dir->__handle;
      if (nh->dom)
	WNetCloseEnum (nh->dom);
      if (nh->net)
	WNetCloseEnum (nh->net);
      cfree (nh);
    }
  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)
{
  if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
    {
      set_errno (EEXIST);
      return 0;
    }
  if (flags & O_WRONLY)
    {
      set_errno (EISDIR);
      return 0;
    }
  /* Open a fake handle to \\Device\\Null */
  return open_null (flags);
}

int
fhandler_netdrive::close ()
{
  /* Skip fhandler_virtual::close, which is a no-op. */
  return fhandler_base::close ();
}