1 | /* Copyright (C) 1992-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <hurd.h> |
19 | #include <hurd/msg_server.h> |
20 | #include <hurd/fd.h> |
21 | #include <unistd.h> |
22 | #include <limits.h> |
23 | #include <string.h> |
24 | #include <argz.h> |
25 | |
26 | |
27 | #define AUTHCHECK \ |
28 | if (auth != mach_task_self () && ! __USEPORT (AUTH, port == auth)) \ |
29 | return EPERM |
30 | |
31 | |
32 | /* Snarfing and frobbing the init ports. */ |
33 | |
34 | kern_return_t |
35 | _S_msg_get_init_port (mach_port_t msgport, mach_port_t auth, int which, |
36 | mach_port_t *result, mach_msg_type_name_t *result_type) |
37 | { |
38 | AUTHCHECK; |
39 | *result_type = MACH_MSG_TYPE_MOVE_SEND; |
40 | /* This function adds a new user reference for the *RESULT it gives back. |
41 | Our reply message uses a move-send right that consumes this reference. */ |
42 | return _hurd_ports_get (which, result); |
43 | } |
44 | |
45 | kern_return_t |
46 | _S_msg_set_init_port (mach_port_t msgport, mach_port_t auth, |
47 | int which, mach_port_t port) |
48 | { |
49 | error_t err; |
50 | |
51 | AUTHCHECK; |
52 | |
53 | err = _hurd_ports_set (which, port); |
54 | if (err == 0) |
55 | __mach_port_deallocate (__mach_task_self (), port); |
56 | |
57 | return 0; |
58 | } |
59 | |
60 | kern_return_t |
61 | _S_msg_get_init_ports (mach_port_t msgport, mach_port_t auth, |
62 | mach_port_t **ports, |
63 | mach_msg_type_name_t *ports_type, |
64 | mach_msg_type_number_t *nports) |
65 | { |
66 | mach_msg_type_number_t i; |
67 | error_t err; |
68 | |
69 | AUTHCHECK; |
70 | |
71 | if (err = __vm_allocate (__mach_task_self (), (vm_address_t *) ports, |
72 | _hurd_nports * sizeof (mach_port_t), 1)) |
73 | return err; |
74 | *nports = _hurd_nports; |
75 | |
76 | for (i = 0; i < _hurd_nports; ++i) |
77 | /* This function adds a new user ref for the *RESULT it gives back. |
78 | Our reply message uses move-send rights that consumes this ref. */ |
79 | if (err = _hurd_ports_get (i, &(*ports)[i])) |
80 | { |
81 | /* Died part way through. Deallocate the ports already fetched. */ |
82 | while (i-- > 0) |
83 | __mach_port_deallocate (__mach_task_self (), (*ports)[i]); |
84 | __vm_deallocate (__mach_task_self (), |
85 | (vm_address_t) *ports, |
86 | *nports * sizeof (mach_port_t)); |
87 | return err; |
88 | } |
89 | |
90 | *ports_type = MACH_MSG_TYPE_MOVE_SEND; |
91 | return 0; |
92 | } |
93 | |
94 | kern_return_t |
95 | _S_msg_set_init_ports (mach_port_t msgport, mach_port_t auth, |
96 | const mach_port_t *ports, mach_msg_type_number_t nports) |
97 | { |
98 | mach_msg_type_number_t i; |
99 | error_t err; |
100 | |
101 | AUTHCHECK; |
102 | |
103 | for (i = 0; i < _hurd_nports; ++i) |
104 | { |
105 | if (err = _hurd_ports_set (i, ports[i])) |
106 | return err; |
107 | else |
108 | __mach_port_deallocate (__mach_task_self (), ports[i]); |
109 | } |
110 | |
111 | return 0; |
112 | } |
113 | |
114 | /* Snarfing and frobbing the init ints. */ |
115 | |
116 | static kern_return_t |
117 | get_int (int which, int *value) |
118 | { |
119 | switch (which) |
120 | { |
121 | case INIT_UMASK: |
122 | *value = _hurd_umask; |
123 | return 0; |
124 | case INIT_SIGPENDING: |
125 | { |
126 | struct hurd_sigstate *ss = _hurd_global_sigstate; |
127 | __spin_lock (&ss->lock); |
128 | *value = ss->pending; |
129 | __spin_unlock (&ss->lock); |
130 | return 0; |
131 | } |
132 | case INIT_SIGIGN: |
133 | { |
134 | struct hurd_sigstate *ss = _hurd_global_sigstate; |
135 | sigset_t ign; |
136 | int sig; |
137 | __spin_lock (&ss->lock); |
138 | __sigemptyset (&ign); |
139 | for (sig = 1; sig < NSIG; ++sig) |
140 | if (ss->actions[sig].sa_handler == SIG_IGN) |
141 | __sigaddset (&ign, sig); |
142 | __spin_unlock (&ss->lock); |
143 | *value = ign; |
144 | return 0; |
145 | } |
146 | default: |
147 | return EINVAL; |
148 | } |
149 | } |
150 | |
151 | kern_return_t |
152 | _S_msg_get_init_int (mach_port_t msgport, mach_port_t auth, |
153 | int which, int *value) |
154 | { |
155 | AUTHCHECK; |
156 | |
157 | return get_int (which, value); |
158 | } |
159 | |
160 | kern_return_t |
161 | _S_msg_get_init_ints (mach_port_t msgport, mach_port_t auth, |
162 | int **values, mach_msg_type_number_t *nvalues) |
163 | { |
164 | error_t err; |
165 | mach_msg_type_number_t i; |
166 | |
167 | AUTHCHECK; |
168 | |
169 | if (err = __vm_allocate (__mach_task_self (), (vm_address_t *) values, |
170 | INIT_INT_MAX * sizeof (int), 1)) |
171 | return err; |
172 | *nvalues = INIT_INT_MAX; |
173 | |
174 | for (i = 0; i < INIT_INT_MAX; ++i) |
175 | switch (err = get_int (i, &(*values)[i])) |
176 | { |
177 | case 0: /* Success. */ |
178 | break; |
179 | case EINVAL: /* Unknown index. */ |
180 | (*values)[i] = 0; |
181 | break; |
182 | default: /* Lossage. */ |
183 | __vm_deallocate (__mach_task_self (), |
184 | (vm_address_t) *values, INIT_INT_MAX * sizeof (int)); |
185 | return err; |
186 | } |
187 | |
188 | return 0; |
189 | } |
190 | |
191 | |
192 | static kern_return_t |
193 | set_int (int which, int value) |
194 | { |
195 | switch (which) |
196 | { |
197 | case INIT_UMASK: |
198 | _hurd_umask = value; |
199 | return 0; |
200 | |
201 | /* These are pretty odd things to do. But you asked for it. */ |
202 | case INIT_SIGPENDING: |
203 | { |
204 | struct hurd_sigstate *ss = _hurd_global_sigstate; |
205 | __spin_lock (&ss->lock); |
206 | ss->pending = value; |
207 | __spin_unlock (&ss->lock); |
208 | return 0; |
209 | } |
210 | case INIT_SIGIGN: |
211 | { |
212 | struct hurd_sigstate *ss = _hurd_global_sigstate; |
213 | int sig; |
214 | const sigset_t ign = value; |
215 | __spin_lock (&ss->lock); |
216 | for (sig = 1; sig < NSIG; ++sig) |
217 | { |
218 | if (__sigismember (&ign, sig)) |
219 | ss->actions[sig].sa_handler = SIG_IGN; |
220 | else if (ss->actions[sig].sa_handler == SIG_IGN) |
221 | ss->actions[sig].sa_handler = SIG_DFL; |
222 | } |
223 | __spin_unlock (&ss->lock); |
224 | return 0; |
225 | |
226 | case INIT_TRACEMASK: |
227 | _hurdsig_traced = value; |
228 | return 0; |
229 | } |
230 | default: |
231 | return EINVAL; |
232 | } |
233 | } |
234 | |
235 | kern_return_t |
236 | _S_msg_set_init_int (mach_port_t msgport, mach_port_t auth, |
237 | int which, int value) |
238 | { |
239 | AUTHCHECK; |
240 | |
241 | return set_int (which, value); |
242 | } |
243 | |
244 | kern_return_t |
245 | _S_msg_set_init_ints (mach_port_t msgport, mach_port_t auth, |
246 | const int *values, mach_msg_type_number_t nvalues) |
247 | { |
248 | error_t err; |
249 | mach_msg_type_number_t i; |
250 | |
251 | AUTHCHECK; |
252 | |
253 | for (i = 0; i < INIT_INT_MAX; ++i) |
254 | switch (err = set_int (i, values[i])) |
255 | { |
256 | case 0: /* Success. */ |
257 | break; |
258 | case EINVAL: /* Unknown index. */ |
259 | break; |
260 | default: /* Lossage. */ |
261 | return err; |
262 | } |
263 | |
264 | return 0; |
265 | } |
266 | |
267 | |
268 | kern_return_t |
269 | _S_msg_get_fd (mach_port_t msgport, mach_port_t auth, int which, |
270 | mach_port_t *result, mach_msg_type_name_t *result_type) |
271 | { |
272 | AUTHCHECK; |
273 | |
274 | /* This creates a new user reference for the send right. |
275 | Our reply message will move that reference to the caller. */ |
276 | *result = __getdport (which); |
277 | if (*result == MACH_PORT_NULL) |
278 | return errno; |
279 | *result_type = MACH_MSG_TYPE_MOVE_SEND; |
280 | |
281 | return 0; |
282 | } |
283 | |
284 | kern_return_t |
285 | _S_msg_set_fd (mach_port_t msgport, mach_port_t auth, |
286 | int which, mach_port_t port) |
287 | { |
288 | AUTHCHECK; |
289 | |
290 | /* We consume the reference if successful. */ |
291 | return HURD_FD_USE (which, (_hurd_port2fd (descriptor, port, 0), 0)); |
292 | } |
293 | |
294 | /* Snarfing and frobbing environment variables. */ |
295 | |
296 | kern_return_t |
297 | _S_msg_get_env_variable (mach_port_t msgport, |
298 | const_string_t variable, // |
299 | char **data, mach_msg_type_number_t *datalen) |
300 | { |
301 | error_t err; |
302 | mach_msg_type_number_t valuelen; |
303 | const char *value = getenv (variable); |
304 | |
305 | if (value == NULL) |
306 | return ENOENT; |
307 | |
308 | valuelen = strlen (value); |
309 | if (valuelen > *datalen) |
310 | { |
311 | if (err = __vm_allocate (__mach_task_self (), |
312 | (vm_address_t *) data, valuelen, 1)) |
313 | return err; |
314 | } |
315 | |
316 | memcpy (*data, value, valuelen); |
317 | *datalen = valuelen; |
318 | |
319 | return 0; |
320 | } |
321 | |
322 | |
323 | kern_return_t |
324 | _S_msg_set_env_variable (mach_port_t msgport, mach_port_t auth, |
325 | const_string_t variable, // |
326 | const_string_t value, // |
327 | int replace) |
328 | { |
329 | AUTHCHECK; |
330 | |
331 | if (__setenv (variable, value, replace)) /* XXX name space */ |
332 | return errno; |
333 | return 0; |
334 | } |
335 | |
336 | kern_return_t |
337 | _S_msg_get_environment (mach_port_t msgport, |
338 | char **data, mach_msg_type_number_t *datalen) |
339 | { |
340 | /* Pack the environment into an array with nulls separating elements. */ |
341 | if (__environ != NULL) |
342 | { |
343 | char *ap, **p; |
344 | size_t envlen = 0; |
345 | |
346 | for (p = __environ; *p != NULL; ++p) |
347 | envlen += strlen (s: *p) + 1; |
348 | |
349 | if (envlen > *datalen) |
350 | { |
351 | if (__vm_allocate (__mach_task_self (), |
352 | (vm_address_t *) data, envlen, 1)) |
353 | return ENOMEM; |
354 | } |
355 | |
356 | ap = *data; |
357 | for (p = __environ; *p != NULL; ++p) |
358 | ap = __memccpy (dest: ap, src: *p, c: '\0', ULONG_MAX); |
359 | |
360 | *datalen = envlen; |
361 | } |
362 | else |
363 | *datalen = 0; |
364 | |
365 | return 0; |
366 | } |
367 | |
368 | kern_return_t |
369 | _S_msg_set_environment (mach_port_t msgport, mach_port_t auth, |
370 | const char *data, mach_msg_type_number_t datalen) |
371 | { |
372 | int _hurd_split_args (char *, mach_msg_type_number_t, char **); |
373 | int envc; |
374 | char **envp; |
375 | |
376 | AUTHCHECK; |
377 | |
378 | envc = __argz_count (argz: data, len: datalen); |
379 | envp = malloc ((envc + 1) * sizeof (char *)); |
380 | if (envp == NULL) |
381 | return errno; |
382 | __argz_extract (argz: data, len: datalen, argv: envp); |
383 | __environ = envp; /* XXX cooperate with loadenv et al */ |
384 | return 0; |
385 | } |
386 | |
387 | |
388 | kern_return_t |
389 | _S_msg_get_dtable (mach_port_t process, |
390 | mach_port_t auth, |
391 | portarray_t *dtable, |
392 | mach_msg_type_name_t *dtablePoly, |
393 | mach_msg_type_number_t *dtableCnt) |
394 | { |
395 | mach_port_t *ports; |
396 | mach_msg_type_number_t i; |
397 | error_t err; |
398 | |
399 | AUTHCHECK; |
400 | |
401 | HURD_CRITICAL_BEGIN; |
402 | __mutex_lock (&_hurd_dtable_lock); |
403 | |
404 | if (err = __vm_allocate (__mach_task_self (), (vm_address_t *) &ports, |
405 | _hurd_dtablesize * sizeof(mach_port_t), 1)) |
406 | goto out; |
407 | |
408 | for (i = 0; i < _hurd_dtablesize; i++) |
409 | { |
410 | struct hurd_fd *cell = _hurd_dtable[i]; |
411 | if (cell == NULL) |
412 | ports[i] = MACH_PORT_NULL; |
413 | else |
414 | { |
415 | __spin_lock (&cell->port.lock); |
416 | if (cell->port.port == MACH_PORT_NULL) |
417 | ports[i] = MACH_PORT_NULL; |
418 | else |
419 | { |
420 | ports[i] = cell->port.port; |
421 | /* We will move this send right. */ |
422 | __mach_port_mod_refs (__mach_task_self (), ports[i], |
423 | MACH_PORT_RIGHT_SEND, +1); |
424 | } |
425 | __spin_unlock (&cell->port.lock); |
426 | } |
427 | } |
428 | |
429 | *dtable = ports; |
430 | *dtablePoly = MACH_MSG_TYPE_MOVE_SEND; |
431 | *dtableCnt = _hurd_dtablesize; |
432 | |
433 | out: |
434 | __mutex_unlock (&_hurd_dtable_lock); |
435 | HURD_CRITICAL_END; |
436 | return err; |
437 | } |
438 | |
439 | /* XXX */ |
440 | |
441 | kern_return_t |
442 | _S_msg_set_dtable (mach_port_t process, |
443 | mach_port_t refport, |
444 | const_portarray_t dtable, |
445 | mach_msg_type_number_t dtableCnt) |
446 | { return EOPNOTSUPP; } |
447 | |