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
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
|
/* Socket I/O operations
Copyright (C) 1995 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <string.h> /* For bzero() */
#include <unistd.h> /* For getpid() */
#include <sys/types.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <hurd.h> /* for getauth() */
#include <hurd/hurd_types.h>
#include <hurd/auth.h>
#include "sock.h"
#include "pipe.h"
#include "connq.h"
#include "sserver.h"
#include "io_S.h"
#include "interrupt_S.h"
/* Read data from an IO object. If offset if -1, read from the object
maintained file pointer. If the object is not seekable, offset is
ignored. The amount desired to be read is in amount. */
error_t
S_io_read (struct sock_user *user,
char **data, mach_msg_type_number_t *data_len,
off_t offset, mach_msg_type_number_t amount)
{
error_t err;
struct pipe *pipe;
if (!user)
return EOPNOTSUPP;
{unsigned refs;
mach_port_get_refs (mach_task_self (), user->pi.port_right, MACH_PORT_RIGHT_SEND, &refs);
debug (user, "send rights: %d", refs);}
err = sock_aquire_read_pipe (user->sock, &pipe);
if (!err)
{
err =
pipe_read (pipe, user->sock->flags & SOCK_NONBLOCK, NULL, NULL,
data, data_len, amount, NULL, NULL, NULL, NULL);
pipe_release (pipe);
}
return err;
}
/* Write data to an IO object. If offset is -1, write at the object
maintained file pointer. If the object is not seekable, offset is
ignored. The amount successfully written is returned in amount. A
given user should not have more than one outstanding io_write on an
object at a time; servers implement congestion control by delaying
responses to io_write. Servers may drop data (returning ENOBUFS)
if they recevie more than one write when not prepared for it. */
error_t
S_io_write (struct sock_user *user,
char *data, mach_msg_type_number_t data_len,
off_t offset, mach_msg_type_number_t *amount)
{
error_t err;
struct pipe *pipe;
if (!user)
return EOPNOTSUPP;
{unsigned refs;
mach_port_get_refs (mach_task_self (), user->pi.port_right, MACH_PORT_RIGHT_SEND, &refs);
debug (user, "send rights: %d", refs);}
err = sock_aquire_write_pipe (user->sock, &pipe);
if (!err)
{
struct addr *source_addr;
/* We could provide a source address for all writes, but we only do so
for connectionless sockets because that's the only place it's
required, and it's more efficient not to. */
if (pipe->class->flags & PIPE_CLASS_CONNECTIONLESS)
err = sock_get_addr (user->sock, &source_addr);
else
source_addr = NULL;
if (!err)
{
err = pipe_write (pipe, source_addr,
data, data_len, NULL, 0, NULL, 0,
amount);
if (source_addr)
ports_port_deref (source_addr);
}
pipe_release (pipe);
}
return err;
}
/* Cause a pending request on this object to immediately return. The
exact semantics are dependent on the specific object. */
error_t
S_interrupt_operation (mach_port_t port)
{
struct pipe *pipe;
struct sock_user *user = ports_lookup_port (sock_port_bucket, port, 0);
if (!user)
return EOPNOTSUPP;
debug (user, "interrupt, sock: %p", user->sock);
{unsigned refs;
mach_port_get_refs (mach_task_self (), user->pi.port_right, MACH_PORT_RIGHT_SEND, &refs);
debug (user, "send rights: %d", refs);}
/* Interrupt pending reads on this socket. We don't bother with writes
since they never block. */
if (sock_aquire_read_pipe (user->sock, &pipe) == 0)
{
/* Indicate to currently waiting threads they've been interrupted. */
pipe->interrupt_seq_num++;
pipe_kick (pipe);
pipe_release (pipe);
}
ports_port_deref (user);
return 0;
}
/* Tell how much data can be read from the object without blocking for
a "long time" (this should be the same meaning of "long time" used
by the nonblocking flag. */
error_t
S_io_readable (struct sock_user *user, mach_msg_type_number_t *amount)
{
error_t err;
struct pipe *pipe;
if (!user)
return EOPNOTSUPP;
err = sock_aquire_read_pipe (user->sock, &pipe);
if (!err)
{
*amount = pipe_readable (user->sock->read_pipe, 1);
pipe_release (pipe);
}
return err;
}
/* Change current read/write offset */
error_t
S_io_seek (struct sock_user *user,
off_t offset, int whence, off_t *new_offset)
{
return user ? ESPIPE : EOPNOTSUPP;
}
/* Return a new port with the same semantics as the existing port. */
error_t
S_io_duplicate (struct sock_user *user,
mach_port_t *new_port, mach_msg_type_name_t *new_port_type)
{
error_t err;
if (!user)
return EOPNOTSUPP;
debug (user, "duping, sock: %p", user->sock);
err = sock_create_port (user->sock, new_port);
if (! err)
*new_port_type = MACH_MSG_TYPE_MAKE_SEND;
{unsigned refs;
mach_port_get_refs (mach_task_self (), user->pi.port_right, MACH_PORT_RIGHT_SEND, &refs);
debug (user, "send rights: %d", refs);}
return err;
}
/* SELECT_TYPE is the bitwise OR of SELECT_READ, SELECT_WRITE, and SELECT_URG.
Block until one of the indicated types of i/o can be done "quickly", and
return the types that are then available. ID_TAG is returned as passed; it
is just for the convenience of the user in matching up reply messages with
specific requests sent. */
error_t
S_io_select (struct sock_user *user, int *select_type, int *id_tag)
{
error_t err = 0;
struct sock *sock;
if (!user)
return EOPNOTSUPP;
*select_type |= ~SELECT_URG; /* We never return these. */
sock = user->sock;
debug (sock, "lock");
mutex_lock (&sock->lock);
if (sock->connq)
/* Sock is used for accepting connections, not I/O. For these, you can
only select for reading, which will block until a connection request
comes along. */
{
debug (sock, "unlock");
mutex_unlock (&sock->lock);
if (*select_type & SELECT_WRITE)
/* Meaningless for a non-i/o socket. */
debug (sock, "ebadf");
return EBADF;
if (*select_type & SELECT_READ)
/* Wait for a connect. Passing in NULL for REQ means that the
request won't be dequeued. */
{debug (sock, "waiting for connection");
return
connq_listen (sock->connq, sock->flags & SOCK_NONBLOCK, NULL, NULL);
}
}
else
/* Sock is a normal read/write socket. */
{
if ((*select_type & SELECT_WRITE) && !sock->write_pipe)
{
debug (sock, "unlock");
mutex_unlock (&sock->lock);
debug (sock, "ebadf");
return EBADF;
}
/* Otherwise, pipes are always writable... */
if (*select_type & SELECT_READ)
{
struct pipe *pipe = sock->read_pipe;
pipe_aquire (pipe);
/* We unlock SOCK here, as it's not subsequently used, and we might
go to sleep waiting for readable data. */
debug (sock, "unlock");
mutex_unlock (&sock->lock);
if (!pipe)
{debug (sock, "ebadf");
return EBADF;
}
if (! pipe_is_readable (pipe, 1))
/* Nothing to read on PIPE yet... */
if (*select_type & ~SELECT_READ)
/* But there's other stuff to report, so return that. */
*select_type &= ~SELECT_READ;
else
/* The user only cares about reading, so wait until something is
readable. */
err = pipe_wait (pipe, 0, 1);
pipe_release (pipe);
}
else
{debug (sock, "unlock");
mutex_unlock (&sock->lock);
}
}
debug (sock, "out");
return err;
}
/* Return the current status of the object. Not all the fields of the
io_statuf_t are meaningful for all objects; however, the access and
modify times, the optimal IO size, and the fs type are meaningful
for all objects. */
error_t
S_io_stat (struct sock_user *user, struct stat *st)
{
struct sock *sock;
struct pipe *rpipe, *wpipe;
void copy_time (time_value_t *from, time_t *to_sec, unsigned long *to_usec)
{
*to_sec = from->seconds;
*to_usec = from->microseconds;
}
if (!user)
return EOPNOTSUPP;
sock = user->sock;
bzero (st, sizeof (struct stat));
st->st_fstype = FSTYPE_SOCKET;
st->st_fsid = getpid ();
st->st_ino = sock->id;
/* As we try to be clever with large transfers, ask for them. */
st->st_blksize = vm_page_size * 16;
debug (sock, "lock");
mutex_lock (&sock->lock); /* Make sure the pipes don't go away... */
rpipe = sock->read_pipe;
wpipe = sock->write_pipe;
mutex_lock (&rpipe->lock);
copy_time (&rpipe->read_time, &st->st_atime, &st->st_atime_usec);
/* This seems useful. */
st->st_size = pipe_readable (rpipe, 1);
mutex_unlock (&rpipe->lock);
if (wpipe)
{
mutex_lock (&wpipe->lock);
copy_time (&wpipe->write_time, &st->st_mtime, &st->st_mtime_usec);
mutex_unlock (&wpipe->lock);
}
copy_time (&sock->change_time, &st->st_ctime, &st->st_ctime_usec);
/* When RPIPE == WPIPE, it *is* a fifo; also the fifo server uses sockets. */
st->st_mode = (wpipe == rpipe ? S_IFIFO : S_IFSOCK);
debug (sock, "unlock");
mutex_unlock (&sock->lock);
return 0;
}
error_t
S_io_get_openmodes (struct sock_user *user, int *bits)
{
unsigned flags;
if (!user)
return EOPNOTSUPP;
flags = user->sock->flags;
*bits =
(flags & SOCK_NONBLOCK ? O_NONBLOCK : 0)
| (flags & SOCK_SHUTDOWN_READ ? 0 : O_READ)
| (flags & SOCK_SHUTDOWN_WRITE ? 0 : O_WRITE);
return 0;
}
error_t
S_io_set_all_openmodes (struct sock_user *user, int bits)
{
if (!user)
return EOPNOTSUPP;
debug (user->sock, "lock");
mutex_lock (&user->sock->lock);
if (bits & SOCK_NONBLOCK)
user->sock->flags |= SOCK_NONBLOCK;
else
user->sock->flags &= ~SOCK_NONBLOCK;
debug (user->sock, "unlock");
mutex_unlock (&user->sock->lock);
return 0;
}
error_t
S_io_set_some_openmodes (struct sock_user *user, int bits)
{
if (!user)
return EOPNOTSUPP;
debug (user->sock, "lock");
mutex_lock (&user->sock->lock);
if (bits & SOCK_NONBLOCK)
user->sock->flags |= SOCK_NONBLOCK;
debug (user->sock, "unlock");
mutex_unlock (&user->sock->lock);
return 0;
}
error_t
S_io_clear_some_openmodes (struct sock_user *user, int bits)
{
if (!user)
return EOPNOTSUPP;
debug (user->sock, "lock");
mutex_lock (&user->sock->lock);
if (bits & SOCK_NONBLOCK)
user->sock->flags &= ~SOCK_NONBLOCK;
debug (user->sock, "unlock");
mutex_unlock (&user->sock->lock);
return 0;
}
#define NIDS 10
error_t
S_io_reauthenticate (struct sock_user *user, mach_port_t rendezvous)
{
error_t err;
mach_port_t auth_server;
mach_port_t new_user_port;
uid_t uids_buf[NIDS], aux_uids_buf[NIDS];
uid_t *uids = uids_buf, *aux_uids = aux_uids_buf;
gid_t gids_buf[NIDS], aux_gids_buf[NIDS];
gid_t *gids = gids_buf, *aux_gids = aux_gids_buf;
unsigned num_uids = NIDS, num_aux_uids = NIDS;
unsigned num_gids = NIDS, num_aux_gids = NIDS;
if (!user)
return EOPNOTSUPP;
err = sock_create_port (user->sock, &new_user_port);
if (err)
return err;
debug (user, "old: %p, new: %d", user, new_user_port);
auth_server = getauth ();
err =
auth_server_authenticate (auth_server, ports_get_right (user),
MACH_MSG_TYPE_MAKE_SEND,
rendezvous, MACH_MSG_TYPE_MOVE_SEND,
new_user_port, MACH_MSG_TYPE_MAKE_SEND,
&uids, &num_uids, &aux_uids, &num_aux_uids,
&gids, &num_gids, &aux_gids, &num_aux_gids);
mach_port_deallocate (mach_task_self (), auth_server);
/* Throw away the ids we went through all that trouble to get... */
#define TRASH_IDS(ids, buf, num) \
if (buf != ids) \
vm_deallocate (mach_task_self (), (vm_address_t)ids, num * sizeof (uid_t));
TRASH_IDS (uids, uids_buf, num_uids);
TRASH_IDS (gids, gids_buf, num_gids);
TRASH_IDS (aux_uids, aux_uids_buf, num_aux_uids);
TRASH_IDS (aux_gids, aux_gids_buf, num_aux_gids);
return err;
}
error_t
S_io_restrict_auth (struct sock_user *user,
mach_port_t *new_port,
mach_msg_type_name_t *new_port_type,
uid_t *uids, unsigned num_uids,
uid_t *gids, unsigned num_gids)
{
if (!user)
return EOPNOTSUPP;
*new_port_type = MACH_MSG_TYPE_MAKE_SEND;
return sock_create_port (user->sock, new_port);
}
/* Stubs for currently unsupported rpcs. */
error_t
S_io_async(struct sock_user *user,
mach_port_t notify_port,
mach_port_t *async_id_port,
mach_msg_type_name_t *async_id_port_type)
{
return EOPNOTSUPP;
}
error_t
S_io_mod_owner(struct sock_user *user, pid_t owner)
{
return EOPNOTSUPP;
}
error_t
S_io_get_owner(struct sock_user *user, pid_t *owner)
{
return EOPNOTSUPP;
}
error_t
S_io_get_icky_async_id (struct sock_user *user,
mach_port_t *icky_async_id_port,
mach_msg_type_name_t *icky_async_id_port_type)
{
return EOPNOTSUPP;
}
error_t
S_io_map (struct sock_user *user,
mach_port_t *memobj_rd, mach_msg_type_name_t *memobj_rd_type,
mach_port_t *memobj_wt, mach_msg_type_name_t *memobj_wt_type)
{
return EOPNOTSUPP;
}
error_t
S_io_map_cntl (struct sock_user *user,
mach_port_t *mem, mach_msg_type_name_t *mem_type)
{
return EOPNOTSUPP;
}
error_t
S_io_get_conch (struct sock_user *user)
{
return EOPNOTSUPP;
}
error_t
S_io_release_conch (struct sock_user *user)
{
return EOPNOTSUPP;
}
error_t
S_io_eofnotify (struct sock_user *user)
{
return EOPNOTSUPP;
}
error_t
S_io_prenotify (struct sock_user *user, vm_offset_t start, vm_offset_t end)
{
return EOPNOTSUPP;
}
error_t
S_io_postnotify (struct sock_user *user, vm_offset_t start, vm_offset_t end)
{
return EOPNOTSUPP;
}
error_t
S_io_readsleep (struct sock_user *user)
{
return EOPNOTSUPP;
}
error_t
S_io_readnotify (struct sock_user *user)
{
return EOPNOTSUPP;
}
error_t
S_io_sigio (struct sock_user *user)
{
return EOPNOTSUPP;
}
error_t
S_io_server_version (struct sock_user *user,
char *name, int *maj, int *min, int *edit)
{
return EOPNOTSUPP;
}
|