server: Move afs_pid out of mmd struct.
[paraslash.git] / attribute.c
1 /* Copyright (C) 1997 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
2
3 /** \file attribute.c Attribute handling functions. */
4
5 #include <regex.h>
6 #include <osl.h>
7 #include <lopsub.h>
8
9 #include "server_cmd.lsg.h"
10 #include "para.h"
11 #include "error.h"
12 #include "crypt.h"
13 #include "string.h"
14 #include "afh.h"
15 #include "afs.h"
16 #include "ipc.h"
17 #include "sideband.h"
18 #include "command.h"
19
20 static struct osl_table *attribute_table;
21 static int greatest_att_bitnum;
22
23 /** The columns of the attribute table. */
24 enum attribute_table_columns {
25 /** The bit number (0-63). */
26 ATTCOL_BITNUM,
27 /** The name of the attribute. */
28 ATTCOL_NAME,
29 /** Number of columns in this table. */
30 NUM_ATT_COLUMNS
31 };
32
33 static int char_compare(const struct osl_object *obj1, const struct osl_object *obj2)
34 {
35 const unsigned char *c1 = (const unsigned char*)obj1->data;
36 const unsigned char *c2 = (const unsigned char*)obj2->data;
37 if (*c1 > *c2)
38 return 1;
39 if (*c1 < *c2)
40 return -1;
41 return 0;
42 }
43
44 static struct osl_column_description att_cols[] = {
45 [ATTCOL_BITNUM] = {
46 .storage_type = OSL_MAPPED_STORAGE,
47 .storage_flags = OSL_RBTREE | OSL_FIXED_SIZE | OSL_UNIQUE,
48 .name = "bitnum",
49 .compare_function = char_compare,
50 .data_size = 1
51 },
52 [ATTCOL_NAME] = {
53 .storage_type = OSL_MAPPED_STORAGE,
54 .storage_flags = OSL_RBTREE | OSL_UNIQUE,
55 .name = "name",
56 .compare_function = string_compare,
57 }
58 };
59
60 static struct osl_table_description attribute_table_desc = {
61 .name = "attributes",
62 .num_columns = NUM_ATT_COLUMNS,
63 .flags = 0,
64 .column_descriptions = att_cols
65 };
66
67 static void find_greatest_att_bitnum(void)
68 {
69 unsigned char c = 63;
70 do {
71 struct osl_row *row;
72 struct osl_object obj = {.data = &c, .size = 1};
73 if (osl_get_row(attribute_table, ATTCOL_BITNUM, &obj,
74 &row) >= 0) {
75 greatest_att_bitnum = c;
76 return;
77 }
78 } while (c--);
79 PARA_INFO_LOG("no attributes\n");
80 greatest_att_bitnum = -E_NO_ATTRIBUTES;
81 }
82
83 /**
84 * Retrieve the identifier (number) of an attribute.
85 *
86 * \param att_name The name of the attribute.
87 * \param bitnum Result pointer.
88 *
89 * \return Positive on success, negative on errors.
90 */
91 int get_attribute_bitnum_by_name(const char *att_name, unsigned char *bitnum)
92 {
93 struct osl_object obj = {.data = (char *)att_name,
94 .size = strlen(att_name) + 1};
95 struct osl_row *row;
96 int ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
97
98 if (ret < 0)
99 return ret;
100 ret = osl(osl_get_object(attribute_table, row, ATTCOL_BITNUM, &obj));
101 if (ret < 0)
102 return ret;
103 *bitnum = *(unsigned char *)obj.data;
104 return 1;
105 }
106
107 /** Data passed to the action function of lsatt */
108 static int print_attribute(struct osl_table *table, struct osl_row *row,
109 const char *name, void *data)
110 {
111 struct afs_callback_arg *aca = data;
112 bool l_given = SERVER_CMD_OPT_GIVEN(LSATT, LONG, aca->lpr);
113 struct osl_object bitnum_obj;
114 int ret;
115
116 if (!l_given) {
117 para_printf(&aca->pbout, "%s\n", name);
118 return 1;
119 }
120 ret = osl(osl_get_object(table, row, ATTCOL_BITNUM, &bitnum_obj));
121 if (ret < 0) {
122 para_printf(&aca->pbout, "%s: %s\n", name, para_strerror(-ret));
123 return ret;
124 }
125 para_printf(&aca->pbout, "%u\t%s\n", *(unsigned char*)bitnum_obj.data,
126 name);
127 return 1;
128 }
129
130 static int com_lsatt_callback(struct afs_callback_arg *aca)
131 {
132 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(LSATT);
133 bool i_given, r_given;
134 int ret;
135 struct pattern_match_data pmd = {
136 .table = attribute_table,
137 .loop_col_num = ATTCOL_NAME,
138 .match_col_num = ATTCOL_NAME,
139 .pm_flags = PM_NO_PATTERN_MATCHES_EVERYTHING,
140 .data = aca,
141 .action = print_attribute
142 };
143
144 ret = lls(lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr));
145 assert(ret >= 0);
146 pmd.lpr = aca->lpr;
147 i_given = SERVER_CMD_OPT_GIVEN(LSATT, ID_SORT, aca->lpr);
148 r_given = SERVER_CMD_OPT_GIVEN(LSATT, REVERSE, aca->lpr);
149
150 if (i_given)
151 pmd.loop_col_num = ATTCOL_BITNUM;
152 if (r_given)
153 pmd.pm_flags |= PM_REVERSE_LOOP;
154 ret = for_each_matching_row(&pmd);
155 if (ret < 0)
156 goto out;
157 if (pmd.num_matches == 0)
158 ret = -E_NO_MATCH;
159 out:
160 lls_free_parse_result(aca->lpr, cmd);
161 return ret;
162 }
163
164 static int com_lsatt(struct command_context *cc, struct lls_parse_result *lpr)
165 {
166 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(LSATT);
167 return send_lls_callback_request(com_lsatt_callback, cmd, lpr, cc);
168 }
169 EXPORT_SERVER_CMD_HANDLER(lsatt);
170
171 struct addatt_event_data {
172 const char *name;
173 unsigned char bitnum;
174 };
175
176 static int com_addatt_callback(struct afs_callback_arg *aca)
177 {
178 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(ADDATT);
179 int i, ret = 1;
180 size_t len;
181 unsigned num_inputs;
182
183 ret = lls(lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr));
184 assert(ret >= 0);
185 num_inputs = lls_num_inputs(aca->lpr);
186 for (i = 0; i < num_inputs; i++) {
187 const char *name = lls_input(i, aca->lpr);
188 struct osl_object objs[NUM_ATT_COLUMNS];
189 struct osl_row *row;
190 unsigned char bitnum;
191 struct addatt_event_data aed;
192
193 len = strlen(name);
194 if (len == 0 || name[len - 1] == '-' || name[len - 1] == '+') {
195 para_printf(&aca->pbout,
196 "invalid attribute name: %s\n", name);
197 continue;
198 }
199 ret = get_attribute_bitnum_by_name(name, &bitnum);
200 if (ret >= 0) {
201 para_printf(&aca->pbout,
202 "attribute \"%s\" already exists\n", name);
203 continue;
204 }
205 if (ret != -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND)) /* error */
206 goto out;
207 objs[ATTCOL_BITNUM].size = 1;
208 /* find smallest unused attribute */
209 for (bitnum = 0; bitnum < 64; bitnum++) {
210 objs[ATTCOL_BITNUM].data = &bitnum;
211 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM,
212 &objs[ATTCOL_BITNUM], &row));
213 if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_RB_KEY_NOT_FOUND))
214 break; /* this bitnum is unused, use it */
215 if (ret < 0) /* error */
216 goto out;
217 /* this bit is already in use, try next bit */
218 }
219 if (bitnum == 64) {
220 ret = -E_ATT_TABLE_FULL;
221 goto out;
222 }
223 objs[ATTCOL_NAME].data = (char *)name;
224 objs[ATTCOL_NAME].size = len + 1;
225 ret = osl(osl_add_row(attribute_table, objs));
226 if (ret < 0)
227 goto out;
228 aed.name = name;
229 aed.bitnum = bitnum;
230 ret = afs_event(ATTRIBUTE_ADD, &aca->pbout, &aed);
231 if (ret < 0)
232 goto out;
233 greatest_att_bitnum = PARA_MAX(greatest_att_bitnum, (int)bitnum);
234 }
235 out:
236 if (ret < 0)
237 para_printf(&aca->pbout, "error while adding %s\n",
238 lls_input(i, aca->lpr));
239 return ret;
240 }
241
242 static int com_addatt(struct command_context *cc, struct lls_parse_result *lpr)
243 {
244 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(ADDATT);
245 char *errctx;
246 int ret = lls(lls_check_arg_count(lpr, 1, 64, &errctx));
247
248 if (ret < 0) {
249 send_errctx(cc, errctx);
250 return ret;
251 }
252 return send_lls_callback_request(com_addatt_callback, cmd, lpr, cc);
253 }
254 EXPORT_SERVER_CMD_HANDLER(addatt);
255
256 static int com_mvatt_callback(struct afs_callback_arg *aca)
257 {
258 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(MVATT);
259 const char *old, *new;
260 struct osl_object obj;
261 struct osl_row *row;
262 int ret;
263
264 ret = lls(lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr));
265 assert(ret >= 0);
266 old = lls_input(0, aca->lpr);
267 new = lls_input(1, aca->lpr);
268 obj.data = (char *)old;
269 obj.size = strlen(old) + 1;
270 ret = osl(osl_get_row(attribute_table, ATTCOL_NAME, &obj, &row));
271 if (ret < 0)
272 goto out;
273 obj.data = (char *)new;
274 obj.size = strlen(new) + 1;
275 /* The update fails if the destination attribute exists. */
276 ret = osl(osl_update_object(attribute_table, row, ATTCOL_NAME, &obj));
277 out:
278 if (ret < 0)
279 para_printf(&aca->pbout, "cannot rename %s to %s\n", old, new);
280 else
281 ret = afs_event(ATTRIBUTE_RENAME, &aca->pbout, NULL);
282 lls_free_parse_result(aca->lpr, cmd);
283 return ret;
284 }
285
286 static int com_mvatt(struct command_context *cc, struct lls_parse_result *lpr)
287 {
288 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(MVATT);
289 char *errctx;
290 int ret = lls(lls_check_arg_count(lpr, 2, 2, &errctx));
291 if (ret < 0) {
292 send_errctx(cc, errctx);
293 return ret;
294 }
295 return send_lls_callback_request(com_mvatt_callback, cmd, lpr, cc);
296 }
297 EXPORT_SERVER_CMD_HANDLER(mvatt);
298
299 static int remove_attribute(struct osl_table *table, struct osl_row *row,
300 const char *name, void *data)
301 {
302 struct afs_callback_arg *aca = data;
303 int ret;
304 struct rmatt_event_data red = {.name = name};
305
306 ret = get_attribute_bitnum_by_name(name, &red.bitnum);
307 if (ret < 0) {
308 para_printf(&aca->pbout, "cannot remove %s\n", name);
309 return ret;
310 }
311 para_printf(&aca->pbout, "removing attribute %s\n", name);
312 ret = osl(osl_del_row(table, row));
313 if (ret < 0) {
314 para_printf(&aca->pbout, "cannot remove %s\n", name);
315 return ret;
316 }
317 return afs_event(ATTRIBUTE_REMOVE, &aca->pbout, &red);
318 }
319
320 static int com_rmatt_callback(struct afs_callback_arg *aca)
321 {
322 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(RMATT);
323 int ret;
324 struct pattern_match_data pmd = {
325 .table = attribute_table,
326 .loop_col_num = ATTCOL_BITNUM,
327 .match_col_num = ATTCOL_NAME,
328 .data = aca,
329 .action = remove_attribute
330 };
331 ret = lls(lls_deserialize_parse_result(aca->query.data, cmd, &aca->lpr));
332 assert(ret >= 0);
333 pmd.lpr = aca->lpr;
334 ret = for_each_matching_row(&pmd);
335 if (ret < 0)
336 goto out;
337 if (pmd.num_matches == 0)
338 ret = -E_NO_MATCH;
339 out:
340 lls_free_parse_result(aca->lpr, cmd);
341 return ret;
342 }
343
344 static int com_rmatt(struct command_context *cc, struct lls_parse_result *lpr)
345 {
346 const struct lls_command *cmd = SERVER_CMD_CMD_PTR(RMATT);
347 char *errctx;
348 int ret = lls(lls_check_arg_count(lpr, 1, INT_MAX, &errctx));
349
350 if (ret < 0) {
351 send_errctx(cc, errctx);
352 return ret;
353 }
354 return send_lls_callback_request(com_rmatt_callback, cmd, lpr, cc);
355 }
356 EXPORT_SERVER_CMD_HANDLER(rmatt);
357
358 /**
359 * Return a binary representation of the given attribute value.
360 *
361 * \param atts Pointer to the attribute value.
362 * \param buf Result.
363 *
364 * This function prints a string of at most 64 characters plus the terminating
365 * \p NULL character into \a buf which must be provided by the caller and at
366 * least 65 bytes long. The "x" character is used for set attributes and "-" is
367 * used for unset attributes.
368 *
369 * In practice, not all 64 attributes are defined. In this case, the function
370 * only prints \a N + 1 characters where \a N is the greatest id of a defined
371 * attribute.
372 */
373 void get_attribute_bitmap(const uint64_t *atts, char *buf)
374 {
375 int i;
376 const uint64_t one = 1;
377
378 for (i = 0; i <= greatest_att_bitnum; i++)
379 buf[greatest_att_bitnum - i] = (*atts & (one << i))? 'x' : '-';
380 buf[i] = '\0';
381 }
382
383 /**
384 * Get a string containing the set attributes in text form.
385 *
386 * \param atts The attribute bitmap.
387 * \param delim The delimiter to separate matching attribute names.
388 * \param text Result pointer.
389 *
390 * \return Positive on success, negative on errors. If no attributes have
391 * been defined, \a *text is NULL.
392 */
393 int get_attribute_text(uint64_t *atts, const char *delim, char **text)
394 {
395 int i, ret;
396 const uint64_t one = 1;
397
398 *text = NULL;
399 if (greatest_att_bitnum < 0) { /* no attributes available */
400 *text = para_strdup("(no attributes available)");
401 return 1;
402 }
403 for (i = 0; i <= greatest_att_bitnum; i++) {
404 unsigned char bn = i;
405 struct osl_object obj = {.data = &bn, .size = 1};
406 struct osl_row *row;
407
408 if (!(*atts & (one << i)))
409 continue;
410 ret = osl(osl_get_row(attribute_table, ATTCOL_BITNUM, &obj, &row));
411 if (ret < 0)
412 goto err;
413 ret = osl(osl_get_object(attribute_table, row, ATTCOL_NAME, &obj));
414 if (ret < 0)
415 goto err;
416 if (*text) {
417 char *tmp = make_message("%s%s%s", *text, delim, (char *)obj.data);
418 free(*text);
419 *text = tmp;
420 } else
421 *text = para_strdup(obj.data);
422 }
423 if (!*text) /* no attributes set */
424 *text = para_strdup("");
425 return 1;
426 err:
427 free(*text);
428 return ret;
429 }
430
431 static int att_logical_or(struct osl_row *row, void *data)
432 {
433 uint64_t *att_mask = data, one = 1;
434 struct osl_object bitnum_obj;
435 int ret = osl_get_object(attribute_table, row, ATTCOL_BITNUM, &bitnum_obj);
436
437 if (ret < 0)
438 return ret;
439 *att_mask |= one << *(unsigned char *)bitnum_obj.data;
440 return 0;
441 }
442
443 /**
444 * Compute the attribute bit mask and check each afs info bitmap.
445 *
446 * \param aca The query field of \a aca is ignored.
447 *
448 * This iterates over all attributes in the attribute table and computes the
449 * logical or of 1 << b where b is the bit number of the attribute. The
450 * resulting bit mask is passed to aft_check_attributes() which performs the
451 * actual check.
452 *
453 * \return Standard.
454 *
455 * \sa \ref aft_check_attributes().
456 */
457 int attribute_check_callback(struct afs_callback_arg *aca)
458 {
459 int ret;
460 uint64_t att_mask = 0; /* bits corresponding to a attributes */
461
462 ret = osl_rbtree_loop(attribute_table, ATTCOL_BITNUM, &att_mask,
463 att_logical_or);
464 if (ret < 0) {
465 PARA_ERROR_LOG("attribute table loop failed: %s\n",
466 para_strerror(-ret));
467 return ret;
468 }
469 return aft_check_attributes(att_mask, &aca->pbout);
470 }
471
472 /**
473 * Close the attribute table.
474 *
475 * \sa \ref osl_close_table().
476 */
477 static void attribute_close(void)
478 {
479 osl_close_table(attribute_table, OSL_MARK_CLEAN);
480 attribute_table = NULL;
481 }
482
483 /**
484 * Open the attribute table.
485 *
486 * \param dir The database directory.
487 *
488 * \return Positive on success, negative on errors.
489 *
490 * \sa \ref osl_open_table().
491 */
492 static int attribute_open(const char *dir)
493 {
494 int ret;
495
496 attribute_table_desc.dir = dir;
497 ret = osl(osl_open_table(&attribute_table_desc, &attribute_table));
498 greatest_att_bitnum = -1; /* no atts available */
499 if (ret >= 0) {
500 find_greatest_att_bitnum();
501 return ret;
502 }
503 attribute_table = NULL;
504 if (ret == -OSL_ERRNO_TO_PARA_ERROR(E_OSL_NOENT))
505 return 1;
506 return ret;
507 }
508
509 static int attribute_create(const char *dir)
510 {
511 attribute_table_desc.dir = dir;
512 return osl(osl_create_table(&attribute_table_desc));
513 }
514
515 /**
516 * Initialize the attribute table structure.
517 *
518 * \param t The table structure to initialize.
519 */
520 void attribute_init(struct afs_table *t)
521 {
522 t->open = attribute_open;
523 t->close = attribute_close;
524 t->create = attribute_create;
525 }