Add sideband implementation.
[paraslash.git] / attribute.c
1 /*
2 * Copyright (C) 1997-2012 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file attribute.c Attribute handling functions. */
8
9 #include <regex.h>
10 #include <osl.h>
11
12 #include "para.h"
13 #include "error.h"
14 #include "crypt.h"
15 #include "string.h"
16 #include "afh.h"
17 #include "afs.h"
18 #include "ipc.h"
19 #include "sideband.h"
20 #include "command.h"
21
22 static struct osl_table *attribute_table;
23 static int greatest_att_bitnum;
24
25 /** The columns of the attribute table. */
26 enum attribute_table_columns {
27 /** The bit number (0-63). */
28 ATTCOL_BITNUM,
29 /** The name of the attribute. */
30 ATTCOL_NAME,
31 /** Number of columns in this table. */
32 NUM_ATT_COLUMNS
33 };
34
35 static int char_compare(const struct osl_object *obj1, const struct osl_object *obj2)
36 {
37 const unsigned char *c1 = (const unsigned char*)obj1->data;
38 const unsigned char *c2 = (const unsigned char*)obj2->data;
39 if (*c1 > *c2)
40 return 1;
41 if (*c1 < *c2)
42 return -1;
43 return 0;
44 }
45
46 static struct osl_column_description att_cols[] = {
47 [ATTCOL_BITNUM] = {
48 .storage_type = OSL_MAPPED_STORAGE,
49 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
50 .name = "bitnum",
51 .compare_function = char_compare,
52 .data_size = 1
53 },
54 [ATTCOL_NAME] = {
55 .storage_type = OSL_MAPPED_STORAGE,
56 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
57 .name = "name",
58 .compare_function = string_compare,
59 }
60 };
61
62 static struct osl_table_description attribute_table_desc = {
63 .name = "attributes",
64 .num_columns = NUM_ATT_COLUMNS,
65 .flags = 0,
66 .column_descriptions = att_cols
67 };
68
69 static void find_greatest_att_bitnum(void)
70 {
71 unsigned char c = 63;
72 do {
73 struct osl_row *row;
74 struct osl_object obj = {.data = &c, .size = 1};
75 if (osl_get_row(attribute_table, ATTCOL_BITNUM, &obj,
76 &row) >= 0) {
77 greatest_att_bitnum = c;
78 return;
79 }
80 } while (c--);
81 PARA_INFO_LOG("no attributes\n");
82 greatest_att_bitnum = -E_NO_ATTRIBUTES;
83 }
84
85 /**
86 * Retrieve the identifier (number) of an attribute.
87 *
88 * \param att_name The name of the attribute.
89 * \param bitnum Result pointer.
90 *
91 * \return Positive on success, negative on errors.
92 */
93 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum)
94 {
95 struct osl_object obj = {.data = (char *)att_name,
96 .size = strlen(att_name) + 1};
97 struct osl_row *row;
98 int ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
99
100 if (ret < 0)
101 return ret;
102 ret = osl(osl_get_object(attribute_table, row, ATTCOL_BITNUM, &obj));
103 if (ret < 0)
104 return ret;
105 *bitnum = *(unsigned char *)obj.data;
106 return 1;
107 }
108
109 /**
110 * Flags used by the lsatt command.
111 *
112 * \param \sa com_lsatt().
113 */
114 enum lsatt_flags {
115 /** Whether "-a" was given for the lsatt command. */
116 LSATT_FLAG_SORT_BY_ID = 1,
117 /** Whether "-l" was given for the lsatt command. */
118 LSATT_FLAG_LONG = 2,
119 /** Reverse sort order. */
120 LSATT_FLAG_REVERSE = 4
121 };
122
123 /** Data passed to the action function of lsatt */
124 struct lsatt_action_data {
125 /** The result buffer. */
126 struct para_buffer pb;
127 /** The given flags for the lsatt command. */
128 unsigned flags;
129 };
130
131 static int print_attribute(struct osl_table *table, struct osl_row *row,
132 const char *name, void *data)
133 {
134 struct lsatt_action_data *laad = data;
135 struct osl_object bitnum_obj;
136 int ret;
137
138 if (!(laad->flags & LSATT_FLAG_LONG))
139 return para_printf(&laad->pb, "%s\n", name);
140 ret = osl(osl_get_object(table, row, ATTCOL_BITNUM, &bitnum_obj));
141 if (ret < 0) {
142 para_printf(&laad->pb, "%s: %s\n", name, para_strerror(-ret));
143 return ret;
144 }
145 return para_printf(&laad->pb, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
146 name);
147 }
148
149 static void com_lsatt_callback(int fd, const struct osl_object *query)
150 {
151 struct lsatt_action_data laad = {
152 .flags = *(unsigned *) query->data,
153 .pb = {
154 .max_size = shm_get_shmmax(),
155 .private_data = &(struct afs_max_size_handler_data) {
156 .fd = fd,
157 },
158 .max_size_handler = afs_max_size_handler
159 }
160
161 };
162 struct pattern_match_data pmd = {
163 .table = attribute_table,
164 .loop_col_num = ATTCOL_BITNUM,
165 .match_col_num = ATTCOL_NAME,
166 .patterns = {.data = (char *)query->data + sizeof(laad.flags),
167 .size = query->size - sizeof(laad.flags)},
168 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
169 .data = &laad,
170 .action = print_attribute
171 };
172 if (laad.flags & LSATT_FLAG_SORT_BY_ID)
173 pmd.loop_col_num = ATTCOL_NAME;
174 if (laad.flags & LSATT_FLAG_REVERSE)
175 pmd.pm_flags |= PM_REVERSE_LOOP;
176 for_each_matching_row(&pmd);
177 if (laad.pb.offset)
178 pass_buffer_as_shm(laad.pb.buf, laad.pb.offset, &fd);
179 free(laad.pb.buf);
180 }
181
182 int com_lsatt(struct command_context *cc)
183 {
184 unsigned flags = 0;
185 struct osl_object options = {.data = &flags, .size = sizeof(flags)};
186 int ret, i;
187
188 for (i = 1; i < cc->argc; i++) {
189 const char *arg = cc->argv[i];
190 if (arg[0] != '-')
191 break;
192 if (!strcmp(arg, "--")) {
193 i++;
194 break;
195 }
196 if (!strcmp(arg, "-i")) {
197 flags |= LSATT_FLAG_SORT_BY_ID;
198 continue;
199 }
200 if (!strcmp(arg, "-l")) {
201 flags |= LSATT_FLAG_LONG;
202 continue;
203 }
204 if (!strcmp(arg, "-r")) {
205 flags |= LSATT_FLAG_REVERSE;
206 continue;
207 }
208 }
209 ret = send_option_arg_callback_request(&options, cc->argc - i, cc->argv + i,
210 com_lsatt_callback, afs_cb_result_handler, cc);
211 if (!ret) {
212 if (cc->argc > 1)
213 ret = sc_send_va_buffer(&cc->scc, "no matches\n");
214 } else if (ret < 0)
215 sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
216 return ret;
217 }
218
219 static void com_setatt_callback(__a_unused int fd, const struct osl_object *query)
220 {
221 char *p;
222 uint64_t add_mask = 0, del_mask = 0;
223 int ret;
224 size_t len;
225 struct osl_object obj;
226 struct osl_row *row;
227
228 for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
229 char c;
230
231 len = strlen(p);
232 ret = -E_ATTR_SYNTAX;
233 if (!*p)
234 goto out;
235 c = p[len - 1];
236 if (c != '+' && c != '-')
237 break;
238 p[len - 1] = '\0';
239 obj.data = p;
240 obj.size = len + 1;
241 ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
242 if (ret < 0)
243 goto out;
244 ret = osl(osl_get_object(attribute_table, row, ATTCOL_BITNUM,
245 &obj));
246 if (ret < 0)
247 goto out;
248 if (c == '+')
249 add_mask |= (1UL << *(unsigned char *)obj.data);
250 else
251 del_mask |= (1UL << *(unsigned char *)obj.data);
252 }
253 ret = -E_ATTR_SYNTAX;
254 if (!add_mask && !del_mask)
255 goto out;
256 PARA_DEBUG_LOG("masks: %llx:%llx\n",(long long unsigned)add_mask,
257 (long long unsigned)del_mask);
258 for (; p < (char *)query->data + query->size; p += len + 1) { /* TODO: fnmatch */
259 struct afs_info old_afsi, new_afsi;
260 struct afsi_change_event_data aced = {.old_afsi = &old_afsi};
261
262 len = strlen(p);
263 ret = aft_get_row_of_path(p, &aced.aft_row);
264 if (ret < 0)
265 goto out;
266 ret = get_afsi_object_of_row(aced.aft_row, &obj);
267 if (ret < 0)
268 goto out;
269 ret = load_afsi(&old_afsi, &obj);
270 if (ret < 0)
271 goto out;
272 new_afsi = old_afsi;
273 new_afsi.attributes |= add_mask;
274 new_afsi.attributes &= ~del_mask;
275 save_afsi(&new_afsi, &obj); /* in-place update */
276 afs_event(AFSI_CHANGE, NULL, &aced);
277 }
278 out:
279 if (ret < 0)
280 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
281 }
282
283 int com_setatt(struct command_context *cc)
284 {
285 if (cc->argc < 3)
286 return -E_ATTR_SYNTAX;
287 return send_standard_callback_request(cc->argc - 1, cc->argv + 1,
288 com_setatt_callback, NULL, NULL);
289 }
290
291 struct addatt_event_data {
292 const char *name;
293 unsigned char bitnum;
294 };
295
296
297 static void com_addatt_callback(int fd, const struct osl_object *query)
298 {
299 char *p;
300 int ret = 1, ret2 = 0;
301 struct para_buffer pb = {
302 .max_size = shm_get_shmmax(),
303 .private_data = &(struct afs_max_size_handler_data) {
304 .fd = fd,
305 },
306 .max_size_handler = afs_max_size_handler
307 };
308 size_t len;
309
310 for (p = query->data; p < (char *)query->data + query->size; p += len + 1) {
311 struct osl_object objs[NUM_ATT_COLUMNS];
312 struct osl_row *row;
313 unsigned char bitnum;
314 struct addatt_event_data aed;
315
316 len = strlen(p);
317 if (!len || p[len - 1] == '-' || p[len - 1] == '+') {
318 ret2 = para_printf(&pb, "invalid attribute name: %s\n", p);
319 if (ret2 < 0)
320 goto out;
321 continue;
322 }
323 ret = get_attribute_bitnum_by_name(p, &bitnum);
324 if (ret >= 0) {
325 ret2 = para_printf(&pb, "attribute \"%s\" already exists\n", p);
326 if (ret2 < 0)
327 goto out;
328 continue;
329 }
330 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND)) /* error */
331 goto out;
332 objs[ATTCOL_BITNUM].size = 1;
333 /* find smallest unused attribute */
334 for (bitnum = 0; bitnum < 64; bitnum++) {
335 objs[ATTCOL_BITNUM].data = &bitnum;
336 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM,
337 &objs[ATTCOL_BITNUM], &row));
338 if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
339 break; /* this bitnum is unused, use it */
340 if (ret < 0) /* error */
341 goto out;
342 /* this bit is already in use, try next bit */
343 }
344 if (bitnum == 64) {
345 ret = -E_ATT_TABLE_FULL;
346 goto out;
347 }
348 objs[ATTCOL_NAME].data = p;
349 objs[ATTCOL_NAME].size = len + 1;
350 ret = osl(osl_add_row(attribute_table, objs));
351 if (ret < 0)
352 goto out;
353 aed.name = p;
354 aed.bitnum = bitnum;
355 afs_event(ATTRIBUTE_ADD, &pb, &aed);
356 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, (int)bitnum);
357 }
358 out:
359 if (ret < 0 && ret2 >= 0)
360 para_printf(&pb, "%s: %s\n", p, para_strerror(-ret));
361 if (pb.offset)
362 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
363 free(pb.buf);
364 }
365
366 int com_addatt(struct command_context *cc)
367 {
368 int ret;
369
370 if (cc->argc < 2)
371 return -E_ATTR_SYNTAX;
372 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
373 com_addatt_callback, afs_cb_result_handler, cc);
374 if (ret < 0)
375 sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
376 return ret;
377 }
378
379 static void com_mvatt_callback(int fd, const struct osl_object *query)
380 {
381 char *old = query->data;
382 size_t size = strlen(old) + 1;
383 char *new = old + size;
384 struct osl_object obj = {.data = old, .size = size};
385 struct osl_row *row;
386 struct para_buffer pb = {
387 .max_size = shm_get_shmmax(),
388 .private_data = &(struct afs_max_size_handler_data) {
389 .fd = fd,
390 },
391 .max_size_handler = afs_max_size_handler,
392 };
393 int ret;
394
395 ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
396 if (ret < 0)
397 goto out;
398 obj.data = new;
399 obj.size = strlen(new) + 1;
400 ret = osl(osl_update_object(attribute_table, row, ATTCOL_NAME, &obj));
401 out:
402 if (ret < 0)
403 para_printf(&pb, "%s\n", para_strerror(-ret));
404 else
405 afs_event(ATTRIBUTE_RENAME, &pb, NULL);
406 if (pb.offset)
407 pass_buffer_as_shm(pb.buf, pb.offset, &fd);
408 free(pb.buf);
409 }
410
411 int com_mvatt(struct command_context *cc)
412 {
413 int ret;
414
415 if (cc->argc != 3)
416 return -E_ATTR_SYNTAX;
417 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
418 com_mvatt_callback, afs_cb_result_handler, cc);
419 if (ret < 0)
420 sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
421 return ret;
422 }
423
424 /** Data passed to the action handler of com_rmatt(). */
425 struct remove_attribute_action_data {
426 /** Message buffer. */
427 struct para_buffer pb;
428 /** Numver of attributes removed. */
429 int num_removed;
430 /** Bitwise "or" of the removed attributes. */
431 uint64_t mask_of_removed_atts;
432 };
433
434 static int remove_attribute(struct osl_table *table, struct osl_row *row,
435 const char *name, void *data)
436 {
437 struct remove_attribute_action_data *raad = data;
438 int ret;
439 struct rmatt_event_data red = {.name = name};
440
441 ret = get_attribute_bitnum_by_name(name, &red.bitnum);
442 if (ret < 0)
443 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
444 ret = osl(osl_del_row(table, row));
445 if (ret < 0)
446 return para_printf(&raad->pb, "%s: %s\n", name, para_strerror(-ret));
447 ret = para_printf(&raad->pb, "removed attribute %s\n", name);
448 raad->num_removed++;
449 raad->mask_of_removed_atts |= (1 << red.bitnum);
450 afs_event(ATTRIBUTE_REMOVE, &raad->pb, &red);
451 return ret;
452 }
453
454 static void com_rmatt_callback(int fd, const struct osl_object *query)
455 {
456 struct remove_attribute_action_data raad = {
457 .num_removed = 0,
458 .pb = {
459 .max_size = shm_get_shmmax(),
460 .private_data = &(struct afs_max_size_handler_data) {
461 .fd = fd,
462 },
463 .max_size_handler = afs_max_size_handler,
464 }
465 };
466 int ret, ret2 = 0;
467 struct pattern_match_data pmd = {
468 .table = attribute_table,
469 .patterns = *query,
470 .loop_col_num = ATTCOL_BITNUM,
471 .match_col_num = ATTCOL_NAME,
472 .data = &raad,
473 .action = remove_attribute
474 };
475 ret = for_each_matching_row(&pmd);
476 if (ret < 0)
477 ret2 = para_printf(&raad.pb, "%s\n", para_strerror(-ret));
478 else if (!raad.num_removed)
479 ret2 = para_printf(&raad.pb, "no match -- nothing removed\n");
480 if (ret2 >= 0 && raad.pb.offset)
481 pass_buffer_as_shm(raad.pb.buf, raad.pb.offset, &fd);
482 free(raad.pb.buf);
483 }
484
485 int com_rmatt(struct command_context *cc)
486 {
487 int ret;
488
489 if (cc->argc < 2)
490 return -E_ATTR_SYNTAX;
491 ret = send_standard_callback_request(cc->argc - 1, cc->argv + 1,
492 com_rmatt_callback, afs_cb_result_handler, cc);
493 if (ret < 0)
494 sc_send_va_buffer(&cc->scc, "%s\n", para_strerror(-ret));
495 return ret;
496 }
497
498 /**
499 * Return a binary representation of the given attribute value.
500 *
501 * \param atts Pointer to the attribute value.
502 * \param buf Result.
503 *
504 * This function prints a string of at most 64 characters plus the terminating
505 * \p NULL character into \a buf which must be provided by the caller and at
506 * least 65 bytes long. The "x" character is used for set attributes and "-" is
507 * used for unset attributes.
508 *
509 * In practice, not all 64 attributes are defined. In this case, the function
510 * only prints \a N + 1 charaters where \a N is the greatest id of a defined
511 * attribute.
512 */
513 void get_attribute_bitmap(const uint64_t *atts, char *buf)
514 {
515 int i;
516 const uint64_t one = 1;
517
518 for (i = 0; i <= greatest_att_bitnum; i++)
519 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
520 buf[i] = '\0';
521 }
522
523 /**
524 * Get a string containing the set attributes in text form.
525 *
526 * \param atts The attribute bitmap.
527 * \param delim The delimiter to separate matching attribute names.
528 * \param text Result pointer.
529 *
530 * \return Positive on success, negative on errors. If no attributes have
531 * been defined, \a *text is NULL.
532 */
533 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
534 {
535 int i, ret;
536 const uint64_t one = 1;
537
538 *text = NULL;
539 if (greatest_att_bitnum < 0) { /* no attributes available */
540 *text = para_strdup("(no attributes available)");
541 return 1;
542 }
543 for (i = 0; i <= greatest_att_bitnum; i++) {
544 unsigned char bn = i;
545 struct osl_object obj = {.data = &bn, .size = 1};
546 struct osl_row *row;
547
548 if (!(*atts & (one << i)))
549 continue;
550 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row));
551 if (ret < 0)
552 goto err;
553 ret = osl(osl_get_object(attribute_table, row, ATTCOL_NAME, &obj));
554 if (ret < 0)
555 goto err;
556 if (*text) {
557 char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
558 free(*text);
559 *text = tmp;
560 } else
561 *text = para_strdup(obj.data);
562 }
563 if (!*text) /* no attributes set */
564 *text = para_strdup("");
565 return 1;
566 err:
567 free(*text);
568 return ret;
569 }
570
571 /**
572 * Close the attribute table.
573 *
574 * \sa osl_close_table().
575 */
576 static void attribute_close(void)
577 {
578 osl_close_table(attribute_table, OSL_MARK_CLEAN);
579 attribute_table = NULL;
580 }
581
582 /**
583 * Open the attribute table.
584 *
585 * \param dir The database directory.
586 *
587 * \return Positive on success, negative on errors.
588 *
589 * \sa osl_open_table().
590 */
591 static int attribute_open(const char *dir)
592 {
593 int ret;
594
595 attribute_table_desc.dir = dir;
596 ret = osl(osl_open_table(&attribute_table_desc, &attribute_table));
597 greatest_att_bitnum = -1; /* no atts available */
598 if (ret >= 0) {
599 find_greatest_att_bitnum();
600 return ret;
601 }
602 attribute_table = NULL;
603 if (ret >= 0 || ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
604 return 1;
605 return ret;
606 }
607
608 static int attribute_create(const char *dir)
609 {
610 attribute_table_desc.dir = dir;
611 return osl(osl_create_table(&attribute_table_desc));
612 }
613
614 /**
615 * Initialize the attribute table structure.
616 *
617 * \param t The table structure to initialize.
618 */
619 void attribute_init(struct afs_table *t)
620 {
621 t->open = attribute_open;
622 t->close = attribute_close;
623 t->create = attribute_create;
624 }