2 This file is part of GNUnet
3 (C) 2003, 2004, 2005, 2006, 2007, 2008 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file util/pseudonym.c
23 * @brief helper functions
24 * @author Christian Grothoff
28 #include "gnunet_common.h"
29 #include "gnunet_container_lib.h"
30 #include "gnunet_disk_lib.h"
31 #include "gnunet_pseudonym_lib.h"
32 #include "gnunet_bio_lib.h"
37 #define PS_METADATA_DIR DIR_SEPARATOR_STR "data" DIR_SEPARATOR_STR "pseudonyms/metadata" DIR_SEPARATOR_STR
42 #define PS_NAMES_DIR DIR_SEPARATOR_STR "data" DIR_SEPARATOR_STR "pseudonyms/names" DIR_SEPARATOR_STR
48 struct DiscoveryCallback
54 struct DiscoveryCallback *next;
59 GNUNET_PSEUDONYM_Iterator callback;
71 static struct DiscoveryCallback *head;
74 * Internal notification about new tracked URI.
79 internal_notify (const GNUNET_HashCode * id,
80 const struct GNUNET_CONTAINER_MetaData *md, int rating)
82 struct DiscoveryCallback *pos;
87 pos->callback (pos->closure, id, md, rating);
93 * Register callback to be invoked whenever we discover
99 GNUNET_PSEUDONYM_discovery_callback_register (const struct
100 GNUNET_CONFIGURATION_Handle
102 GNUNET_PSEUDONYM_Iterator
103 iterator, void *closure)
105 struct DiscoveryCallback *list;
107 list = GNUNET_malloc (sizeof (struct DiscoveryCallback));
108 list->callback = iterator;
109 list->closure = closure;
112 GNUNET_PSEUDONYM_list_all (cfg, iterator, closure);
117 * Unregister pseudonym discovery callback.
122 GNUNET_PSEUDONYM_discovery_callback_unregister (GNUNET_PSEUDONYM_Iterator
123 iterator, void *closure)
125 struct DiscoveryCallback *prev;
126 struct DiscoveryCallback *pos;
130 while ((pos != NULL) &&
131 ((pos->callback != iterator) || (pos->closure != closure)))
137 return GNUNET_SYSERR;
141 prev->next = pos->next;
148 * Get the filename (or directory name) for the given
149 * pseudonym identifier and directory prefix.
154 get_data_filename (const struct GNUNET_CONFIGURATION_Handle
155 *cfg, const char *prefix, const GNUNET_HashCode * psid)
157 struct GNUNET_CRYPTO_HashAsciiEncoded enc;
160 GNUNET_CRYPTO_hash_to_enc (psid, &enc);
161 return GNUNET_DISK_get_home_filename (cfg,
162 GNUNET_CLIENT_SERVICE_NAME,
165 NULL) ? NULL : (const char *) &enc,
174 write_pseudonym_info (const struct GNUNET_CONFIGURATION_Handle *cfg,
175 const GNUNET_HashCode * nsid,
176 const struct GNUNET_CONTAINER_MetaData *meta,
177 int32_t ranking, const char *ns_name)
181 fn = get_data_filename (cfg, PS_METADATA_DIR, nsid);
182 GNUNET_assert (fn != NULL);
183 struct GNUNET_BIO_WriteHandle *fileW;
184 fileW = GNUNET_BIO_write_open(fn);
185 GNUNET_assert (NULL != fileW);
186 GNUNET_assert (GNUNET_OK == GNUNET_BIO_write_int32(fileW, ranking));
187 GNUNET_assert (GNUNET_OK == GNUNET_BIO_write_string(fileW, ns_name));
188 GNUNET_assert (GNUNET_OK == GNUNET_BIO_write_meta_data(fileW, meta));
189 GNUNET_assert(GNUNET_OK == GNUNET_BIO_write_close(fileW));
191 /* create entry for pseudonym name in names */
192 GNUNET_free_non_null (GNUNET_PSEUDONYM_id_to_name (cfg, nsid));
200 read_info (const struct GNUNET_CONFIGURATION_Handle *cfg,
201 const GNUNET_HashCode * nsid,
202 struct GNUNET_CONTAINER_MetaData **meta,
203 int32_t * ranking, char **ns_name)
208 fn = get_data_filename (cfg, PS_METADATA_DIR, nsid);
209 GNUNET_assert (fn != NULL);
210 struct GNUNET_BIO_ReadHandle *fileR;
211 fileR = GNUNET_BIO_read_open(fn);
212 GNUNET_assert (NULL != fileR);
213 GNUNET_assert (GNUNET_OK == GNUNET_BIO_read_int32__(fileR, "Read int32 error!", ranking));
214 GNUNET_assert (GNUNET_OK == GNUNET_BIO_read_string(fileR, "Read string error!", ns_name, 200));
215 GNUNET_assert (GNUNET_OK == GNUNET_BIO_read_meta_data(fileR, "Read meta data error!", meta));
216 GNUNET_assert(GNUNET_OK == GNUNET_BIO_read_close(fileR, &emsg));
224 * Return the unique, human readable name for the given namespace.
226 * @param cfg configuration
227 * @param nsid cryptographic ID of the namespace
228 * @return NULL on failure (should never happen)
231 GNUNET_PSEUDONYM_id_to_name (const struct GNUNET_CONFIGURATION_Handle *cfg,
232 const GNUNET_HashCode * nsid)
234 struct GNUNET_CONTAINER_MetaData *meta;
239 struct GNUNET_DISK_FileHandle *fh;
245 int32_t *rank = &temp;
249 if (GNUNET_OK == read_info (cfg, nsid, &meta, rank, &name))
251 if ((meta != NULL) && (name == NULL))
252 name = GNUNET_CONTAINER_meta_data_get_first_by_types (meta,
255 EXTRACTOR_DESCRIPTION,
265 GNUNET_CONTAINER_meta_data_destroy (meta);
270 name = GNUNET_strdup (_("no-name"));
271 GNUNET_CRYPTO_hash (name, strlen (name), &nh);
272 fn = get_data_filename (cfg, PS_NAMES_DIR, &nh);
273 GNUNET_assert (fn != NULL);
276 if (0 == STAT (fn, &sbuf))
277 GNUNET_DISK_file_size (fn, &len, GNUNET_YES);
278 fh = GNUNET_DISK_file_open (fn, GNUNET_DISK_OPEN_CREATE
279 | GNUNET_DISK_OPEN_READWRITE,
280 GNUNET_DISK_PERM_USER_READ |
281 GNUNET_DISK_PERM_USER_WRITE);
284 while ((len >= sizeof (GNUNET_HashCode)) &&
285 (sizeof (GNUNET_HashCode)
286 == GNUNET_DISK_file_read (fh, &nh, sizeof (GNUNET_HashCode))))
288 if (0 == memcmp (&nh, nsid, sizeof (GNUNET_HashCode)))
294 len -= sizeof (GNUNET_HashCode);
299 if (sizeof (GNUNET_HashCode) !=
300 GNUNET_DISK_file_write (fh, nsid, sizeof (GNUNET_HashCode)))
301 GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING, "write", fn);
303 GNUNET_DISK_file_close (fh);
304 ret = GNUNET_malloc (strlen (name) + 32);
305 GNUNET_snprintf (ret, strlen (name) + 32, "%s-%u", name, idx);
312 * Get the namespace ID belonging to the given namespace name.
314 * @param cfg configuration to use
315 * @param ns_uname human-readable name for the namespace
316 * @param nsid set to namespace ID based on 'ns_uname'
317 * @return GNUNET_OK on success
320 GNUNET_PSEUDONYM_name_to_id (const struct GNUNET_CONFIGURATION_Handle *cfg,
321 const char *ns_uname, GNUNET_HashCode * nsid)
329 struct GNUNET_DISK_FileHandle *fh;
332 slen = strlen (ns_uname);
333 while ((slen > 0) && (1 != sscanf (&ns_uname[slen - 1], "-%u", &idx)))
336 return GNUNET_SYSERR;
337 name = GNUNET_strdup (ns_uname);
338 name[slen - 1] = '\0';
339 GNUNET_CRYPTO_hash (name, strlen (name), &nh);
341 fn = get_data_filename (cfg, PS_NAMES_DIR, &nh);
342 GNUNET_assert (fn != NULL);
344 if ((GNUNET_OK != GNUNET_DISK_file_test (fn) ||
345 (GNUNET_OK != GNUNET_DISK_file_size (fn, &len, GNUNET_YES))) ||
346 ((idx + 1) * sizeof (GNUNET_HashCode) > len))
349 return GNUNET_SYSERR;
351 fh = GNUNET_DISK_file_open (fn, GNUNET_DISK_OPEN_CREATE
352 | GNUNET_DISK_OPEN_READWRITE,
353 GNUNET_DISK_PERM_USER_READ |
354 GNUNET_DISK_PERM_USER_WRITE);
356 GNUNET_DISK_file_seek (fh, idx * sizeof (GNUNET_HashCode),
357 GNUNET_DISK_SEEK_SET);
358 if (sizeof (GNUNET_HashCode) !=
359 GNUNET_DISK_file_read (fh, nsid, sizeof (GNUNET_HashCode)))
361 GNUNET_DISK_file_close (fh);
362 return GNUNET_SYSERR;
364 GNUNET_DISK_file_close (fh);
373 struct ListPseudonymClosure
379 GNUNET_PSEUDONYM_Iterator iterator;
389 const struct GNUNET_CONFIGURATION_Handle *cfg;
398 list_pseudonym_helper (void *cls, const char *fullname)
400 struct ListPseudonymClosure *c = cls;
404 struct GNUNET_CONTAINER_MetaData *meta;
406 const char *str = "not null";
408 if (strlen (fullname) < sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded))
411 &fullname[strlen (fullname) + 1 -
412 sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
413 if (fn[-1] != DIR_SEPARATOR)
416 if (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (fn, &id))
417 return GNUNET_OK; /* invalid name */
418 if (GNUNET_OK != read_info (c->cfg, &id, &meta, &rating, &str))
419 return GNUNET_OK; /* ignore entry */
420 if (c->iterator != NULL)
421 ret = c->iterator (c->closure, &id, meta, rating);
422 GNUNET_CONTAINER_meta_data_destroy (meta);
428 * List all available pseudonyms.
430 * @param cfg overall configuration
431 * @param iterator function to call for each pseudonym
432 * @param closure closure for iterator
433 * @return number of pseudonyms found
436 GNUNET_PSEUDONYM_list_all (const struct GNUNET_CONFIGURATION_Handle *cfg,
437 GNUNET_PSEUDONYM_Iterator iterator, void *closure)
439 struct ListPseudonymClosure cls;
443 cls.iterator = iterator;
444 cls.closure = closure;
446 fn = get_data_filename (cfg, PS_METADATA_DIR, NULL);
447 GNUNET_assert (fn != NULL);
448 GNUNET_DISK_directory_create (fn);
449 ret = GNUNET_DISK_directory_scan (fn, &list_pseudonym_helper, &cls);
455 * Change the ranking of a pseudonym.
457 * @param cfg overall configuration
458 * @param nsid id of the pseudonym
459 * @param delta by how much should the rating be
461 * @return new rating of the pseudonym
464 GNUNET_PSEUDONYM_rank (const struct GNUNET_CONFIGURATION_Handle *cfg,
465 const GNUNET_HashCode * nsid, int delta)
467 struct GNUNET_CONTAINER_MetaData *meta;
473 ret = read_info (cfg, nsid, &meta, &ranking, &name);
474 if (ret == GNUNET_SYSERR)
477 meta = GNUNET_CONTAINER_meta_data_create ();
480 write_pseudonym_info (cfg, nsid, meta, ranking, name);
481 GNUNET_CONTAINER_meta_data_destroy (meta);
482 GNUNET_free_non_null (name);
487 * Insert metadata into existing MD record (passed as cls).
489 * @param cls metadata to add to
490 * @param type type of entry to insert
491 * @param data value of entry to insert
494 merge_meta_helper (void *cls, EXTRACTOR_KeywordType type, const char *data)
496 struct GNUNET_CONTAINER_MetaData *meta = cls;
497 GNUNET_CONTAINER_meta_data_insert (meta, type, data);
504 * Add a pseudonym to the set of known pseudonyms.
505 * For all pseudonym advertisements that we discover
506 * FS should automatically call this function.
508 * @param cfg overall configuration
509 * @param id the pseudonym identifier
510 * @param meta metadata for the pseudonym
513 GNUNET_PSEUDONYM_add (const struct GNUNET_CONFIGURATION_Handle *cfg,
514 const GNUNET_HashCode * id,
515 const struct GNUNET_CONTAINER_MetaData *meta)
519 struct GNUNET_CONTAINER_MetaData *old;
524 fn = get_data_filename (cfg, PS_METADATA_DIR, id);
525 GNUNET_assert (fn != NULL);
527 if ((0 == STAT (fn, &sbuf)) &&
528 (GNUNET_OK == read_info (cfg, id, &old, &ranking, &name)))
530 GNUNET_CONTAINER_meta_data_get_contents (meta, &merge_meta_helper, old);
531 write_pseudonym_info (cfg, id, old, ranking, name);
532 GNUNET_CONTAINER_meta_data_destroy (old);
533 GNUNET_free_non_null (name);
537 write_pseudonym_info (cfg, id, meta, ranking, NULL);
540 internal_notify (id, meta, ranking);
547 /* end of pseudonym.c */