2 This file is part of GNUnet.
3 (C) 2003--2014 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 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
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.
15 You should have received a copy of the GNU General Public License
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.
23 * @brief Parses and produces uri strings.
24 * @author Igor Wronsky, Christian Grothoff
26 * GNUnet URIs are of the general form "gnunet://MODULE/IDENTIFIER".
27 * The specific structure of "IDENTIFIER" depends on the module and
28 * maybe differenciated into additional subcategories if applicable.
29 * This module only deals with fs identifiers (MODULE = "fs").
32 * This module only parses URIs for the AFS module. The FS URIs fall
33 * into four categories, "chk", "sks", "ksk" and "loc". The first three
34 * categories were named in analogy (!) to Freenet, but they do NOT
35 * work in exactly the same way. They are very similar from the user's
36 * point of view (unique file identifier, subspace, keyword), but the
37 * implementation is rather different in pretty much every detail.
38 * The concrete URI formats are:
42 * First, there are URIs that identify a file. They have the format
43 * "gnunet://fs/chk/HEX1.HEX2.SIZE". These URIs can be used to
44 * download the file. The description, filename, mime-type and other
45 * meta-data is NOT part of the file-URI since a URI uniquely
46 * identifies a resource (and the contents of the file would be the
47 * same even if it had a different description).
51 * The second category identifies entries in a namespace. The format
52 * is "gnunet://fs/sks/NAMESPACE/IDENTIFIER" where the namespace
53 * should be given in HEX. Applications may allow using a nickname
54 * for the namespace if the nickname is not ambiguous. The identifier
55 * can be either an ASCII sequence or a HEX-encoding. If the
56 * identifier is in ASCII but the format is ambiguous and could denote
57 * a HEX-string a "/" is appended to indicate ASCII encoding.
61 * The third category identifies ordinary searches. The format is
62 * "gnunet://fs/ksk/KEYWORD[+KEYWORD]*". Using the "+" syntax
63 * it is possible to encode searches with the boolean "AND" operator.
64 * "+" is used since it indicates a commutative 'and' operation and
65 * is unlikely to be used in a keyword by itself.
69 * The last category identifies a datum on a specific machine. The
70 * format is "gnunet://fs/loc/HEX1.HEX2.SIZE.PEER.SIG.EXPTIME". PEER is
71 * the BinName of the public key of the peer storing the datum. The
72 * signature (SIG) certifies that this peer has this content.
73 * HEX1, HEX2 and SIZE correspond to a 'chk' URI.
77 * The encoding for hexadecimal values is defined in the hashing.c
78 * module in the gnunetutil library and discussed there.
82 #include "gnunet_fs_service.h"
83 #include "gnunet_signatures.h"
94 * Get a unique key from a URI. This is for putting URIs
95 * into HashMaps. The key may change between FS implementations.
97 * @param uri uri to convert to a unique key
98 * @param key where to store the unique key
101 GNUNET_FS_uri_to_key (const struct GNUNET_FS_Uri *uri,
102 struct GNUNET_HashCode *key)
106 case GNUNET_FS_URI_CHK:
107 *key = uri->data.chk.chk.query;
109 case GNUNET_FS_URI_SKS:
110 GNUNET_CRYPTO_hash (uri->data.sks.identifier,
111 strlen (uri->data.sks.identifier), key);
113 case GNUNET_FS_URI_KSK:
114 if (uri->data.ksk.keywordCount > 0)
115 GNUNET_CRYPTO_hash (uri->data.ksk.keywords[0],
116 strlen (uri->data.ksk.keywords[0]), key);
118 case GNUNET_FS_URI_LOC:
119 GNUNET_CRYPTO_hash (&uri->data.loc.fi,
120 sizeof (struct FileIdentifier) +
121 sizeof (struct GNUNET_PeerIdentity),
125 memset (key, 0, sizeof (struct GNUNET_HashCode));
132 * Convert keyword URI to a human readable format
133 * (i.e. the search query that was used in the first place)
135 * @param uri ksk uri to convert to a string
136 * @return string with the keywords
139 GNUNET_FS_uri_ksk_to_string_fancy (const struct GNUNET_FS_Uri *uri)
146 unsigned int keywordCount;
148 if ((NULL == uri) || (GNUNET_FS_URI_KSK != uri->type))
153 keywords = uri->data.ksk.keywords;
154 keywordCount = uri->data.ksk.keywordCount;
155 n = keywordCount + 1;
156 for (i = 0; i < keywordCount; i++)
158 keyword = keywords[i];
159 n += strlen (keyword) - 1;
160 if (NULL != strstr (&keyword[1], " "))
162 if (keyword[0] == '+')
165 ret = GNUNET_malloc (n);
167 for (i = 0; i < keywordCount; i++)
169 keyword = keywords[i];
170 if (NULL != strstr (&keyword[1], " "))
173 if (keyword[0] == '+')
174 strcat (ret, keyword);
176 strcat (ret, &keyword[1]);
181 if (keyword[0] == '+')
182 strcat (ret, keyword);
184 strcat (ret, &keyword[1]);
193 * Given a keyword with %-encoding (and possibly quotes to protect
194 * spaces), return a copy of the keyword without %-encoding and
195 * without double-quotes (%22). Also, add a space at the beginning
196 * if there is not a '+'.
198 * @param in string with %-encoding
199 * @param emsg where to store the parser error message (if any)
200 * @return decodded string with leading space (or preserved plus)
203 percent_decode_keyword (const char *in,
212 out = GNUNET_strdup (in);
215 while (out[rpos] != '\0')
217 if (out[rpos] == '%')
219 if (1 != SSCANF (&out[rpos + 1], "%2X", &hx))
222 *emsg = GNUNET_strdup (_(/* xgettext:no-c-format */
223 "Malformed KSK URI (`%' must be followed by HEX number)"));
228 continue; /* skip double quote */
229 out[wpos++] = (char) hx;
233 out[wpos++] = out[rpos++];
239 ret = GNUNET_strdup (out);
243 /* need to prefix with space */
244 ret = GNUNET_malloc (strlen (out) + 2);
252 #define GNUNET_FS_URI_KSK_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_KSK_INFIX
257 * @param s an uri string
258 * @param emsg where to store the parser error message (if any)
259 * @return NULL on error, otherwise the KSK URI
261 static struct GNUNET_FS_Uri *
262 uri_ksk_parse (const char *s,
265 struct GNUNET_FS_Uri *ret;
275 GNUNET_assert (NULL != s);
277 pos = strlen (GNUNET_FS_URI_KSK_PREFIX);
278 if ((slen <= pos) || (0 != strncmp (s, GNUNET_FS_URI_KSK_PREFIX, pos)))
279 return NULL; /* not KSK URI */
280 if ((s[slen - 1] == '+') || (s[pos] == '+'))
283 GNUNET_strdup (_("Malformed KSK URI (must not begin or end with `+')"));
288 for (i = pos; i < slen; i++)
290 if ((s[i] == '%') && (&s[i] == strstr (&s[i], "%22")))
292 saw_quote = (saw_quote + 1) % 2;
296 if ((s[i] == '+') && (saw_quote == 0))
301 *emsg = GNUNET_strdup (_("Malformed KSK URI (`++' not allowed)"));
308 *emsg = GNUNET_strdup (_("Malformed KSK URI (quotes not balanced)"));
312 dup = GNUNET_strdup (s);
313 keywords = GNUNET_malloc (max * sizeof (char *));
314 for (i = slen - 1; i >= (int) pos; i--)
316 if ((s[i] == '%') && (&s[i] == strstr (&s[i], "%22")))
318 saw_quote = (saw_quote + 1) % 2;
322 if ((dup[i] == '+') && (saw_quote == 0))
324 keywords[--max] = percent_decode_keyword (&dup[i + 1], emsg);
325 if (NULL == keywords[max])
330 keywords[--max] = percent_decode_keyword (&dup[pos], emsg);
331 if (NULL == keywords[max])
333 GNUNET_assert (0 == max);
335 ret = GNUNET_new (struct GNUNET_FS_Uri);
336 ret->type = GNUNET_FS_URI_KSK;
337 ret->data.ksk.keywordCount = iret;
338 ret->data.ksk.keywords = keywords;
341 for (i = 0; i < max; i++)
342 GNUNET_free_non_null (keywords[i]);
343 GNUNET_free (keywords);
349 #define GNUNET_FS_URI_SKS_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_SKS_INFIX
354 * @param s an uri string
355 * @param emsg where to store the parser error message (if any)
356 * @return NULL on error, SKS URI otherwise
358 static struct GNUNET_FS_Uri *
359 uri_sks_parse (const char *s,
362 struct GNUNET_FS_Uri *ret;
363 struct GNUNET_CRYPTO_EcdsaPublicKey ns;
367 GNUNET_assert (s != NULL);
368 pos = strlen (GNUNET_FS_URI_SKS_PREFIX);
369 if ((strlen (s) <= pos) || (0 != strncmp (s, GNUNET_FS_URI_SKS_PREFIX, pos)))
370 return NULL; /* not an SKS URI */
371 end = strchr (&s[pos], '/');
372 if ( (NULL == end) ||
374 GNUNET_STRINGS_string_to_data (&s[pos],
379 *emsg = GNUNET_strdup (_("Malformed SKS URI (wrong syntax)"));
380 return NULL; /* malformed */
382 end++; /* skip over '/' */
383 ret = GNUNET_new (struct GNUNET_FS_Uri);
384 ret->type = GNUNET_FS_URI_SKS;
385 ret->data.sks.ns = ns;
386 ret->data.sks.identifier = GNUNET_strdup (end);
390 #define GNUNET_FS_URI_CHK_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_CHK_INFIX
396 * @param s an uri string
397 * @param emsg where to store the parser error message (if any)
398 * @return NULL on error, CHK URI otherwise
400 static struct GNUNET_FS_Uri *
401 uri_chk_parse (const char *s,
404 struct GNUNET_FS_Uri *ret;
405 struct FileIdentifier fi;
407 unsigned long long flen;
409 char h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
410 char h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
414 GNUNET_assert (s != NULL);
416 pos = strlen (GNUNET_FS_URI_CHK_PREFIX);
417 if ((slen < pos + 2 * sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
418 (0 != strncmp (s, GNUNET_FS_URI_CHK_PREFIX, pos)))
419 return NULL; /* not a CHK URI */
420 if ((s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
421 (s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
423 *emsg = GNUNET_strdup (_("Malformed CHK URI (wrong syntax)"));
426 memcpy (h1, &s[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
427 h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
428 memcpy (h2, &s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)],
429 sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
430 h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
432 if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &fi.chk.key)) ||
433 (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &fi.chk.query)) ||
435 SSCANF (&s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
438 *emsg = GNUNET_strdup (_("Malformed CHK URI (failed to decode CHK)"));
441 fi.file_length = GNUNET_htonll (flen);
442 ret = GNUNET_new (struct GNUNET_FS_Uri);
443 ret->type = GNUNET_FS_URI_CHK;
449 GNUNET_NETWORK_STRUCT_BEGIN
451 * Structure that defines how the contents of a location URI must be
452 * assembled in memory to create or verify the signature of a location
455 struct LocUriAssembly
458 * What is being signed (rest of this struct).
460 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
463 * Expiration time of the offer.
465 struct GNUNET_TIME_AbsoluteNBO exptime;
468 * File being offered.
470 struct FileIdentifier fi;
473 * Peer offering the file.
475 struct GNUNET_PeerIdentity peer;
478 GNUNET_NETWORK_STRUCT_END
481 #define GNUNET_FS_URI_LOC_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_LOC_INFIX
483 #define SIGNATURE_ASCII_LENGTH 103
487 * Also verifies validity of the location URI.
489 * @param s an uri string
490 * @param emsg where to store the parser error message (if any)
491 * @return NULL on error, valid LOC URI otherwise
493 static struct GNUNET_FS_Uri *
494 uri_loc_parse (const char *s,
497 struct GNUNET_FS_Uri *uri;
498 char h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
499 char h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
502 unsigned long long exptime;
503 unsigned long long flen;
504 struct GNUNET_TIME_Absolute et;
505 struct GNUNET_CRYPTO_EddsaSignature sig;
506 struct LocUriAssembly ass;
510 pos = strlen (GNUNET_FS_URI_LOC_PREFIX);
511 if ((slen < pos + 2 * sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
512 (0 != strncmp (s, GNUNET_FS_URI_LOC_PREFIX, pos)))
513 return NULL; /* not a LOC URI */
514 if ((s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
515 (s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
517 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax)"));
520 memcpy (h1, &s[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
521 h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
522 memcpy (h2, &s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)],
523 sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
524 h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
526 if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &ass.fi.chk.key)) ||
527 (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &ass.fi.chk.query)) ||
529 SSCANF (&s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
532 *emsg = GNUNET_strdup (_("LOC URI malformed (no CHK)"));
535 ass.fi.file_length = GNUNET_htonll (flen);
537 npos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2;
538 while ((s[npos] != '\0') && (s[npos] != '.'))
542 *emsg = GNUNET_strdup (_("LOC URI malformed (missing LOC)"));
546 if ( (strlen (&s[npos]) <= GNUNET_CRYPTO_PKEY_ASCII_LENGTH + 1) ||
547 ('.' != s[npos+GNUNET_CRYPTO_PKEY_ASCII_LENGTH]) )
550 GNUNET_strdup (_("LOC URI malformed (wrong syntax for public key)"));
553 GNUNET_CRYPTO_eddsa_public_key_from_string (&s[npos],
554 GNUNET_CRYPTO_PKEY_ASCII_LENGTH,
555 &ass.peer.public_key))
558 GNUNET_strdup (_("LOC URI malformed (could not decode public key)"));
561 npos += GNUNET_CRYPTO_PKEY_ASCII_LENGTH;
562 if (s[npos++] != '.')
564 *emsg = GNUNET_strdup (_("LOC URI malformed (could not find signature)"));
567 if ( (strlen (&s[npos]) <= SIGNATURE_ASCII_LENGTH + 1) ||
568 ('.' != s[npos + SIGNATURE_ASCII_LENGTH]) )
570 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax for signature)"));
574 GNUNET_STRINGS_string_to_data (&s[npos],
575 SIGNATURE_ASCII_LENGTH,
577 sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
579 *emsg = GNUNET_strdup (_("LOC URI malformed (could not decode signature)"));
582 npos += SIGNATURE_ASCII_LENGTH;
583 if (s[npos++] != '.')
585 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax for expiration time)"));
588 if (1 != SSCANF (&s[npos], "%llu", &exptime))
591 GNUNET_strdup (_("LOC URI malformed (could not parse expiration time)"));
594 ass.purpose.size = htonl (sizeof (struct LocUriAssembly));
595 ass.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT);
596 et.abs_value_us = exptime * 1000LL * 1000LL;
597 ass.exptime = GNUNET_TIME_absolute_hton (et);
599 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT,
600 &ass.purpose, &sig, &ass.peer.public_key))
603 GNUNET_strdup (_("LOC URI malformed (signature failed validation)"));
606 uri = GNUNET_new (struct GNUNET_FS_Uri);
607 uri->type = GNUNET_FS_URI_LOC;
608 uri->data.loc.fi = ass.fi;
609 uri->data.loc.peer = ass.peer;
610 uri->data.loc.expirationTime = et;
611 uri->data.loc.contentSignature = sig;
620 * Convert a UTF-8 String to a URI.
622 * @param uri string to parse
623 * @param emsg where to store the parser error message (if any)
624 * @return NULL on error
626 struct GNUNET_FS_Uri *
627 GNUNET_FS_uri_parse (const char *uri,
630 struct GNUNET_FS_Uri *ret;
636 if ((NULL != (ret = uri_chk_parse (uri, emsg))) ||
637 (NULL != (ret = uri_ksk_parse (uri, emsg))) ||
638 (NULL != (ret = uri_sks_parse (uri, emsg))) ||
639 (NULL != (ret = uri_loc_parse (uri, emsg))))
642 *emsg = GNUNET_strdup (_("Unrecognized URI type"));
652 * @param uri uri to free
655 GNUNET_FS_uri_destroy (struct GNUNET_FS_Uri *uri)
661 case GNUNET_FS_URI_KSK:
662 for (i = 0; i < uri->data.ksk.keywordCount; i++)
663 GNUNET_free (uri->data.ksk.keywords[i]);
664 GNUNET_array_grow (uri->data.ksk.keywords, uri->data.ksk.keywordCount, 0);
666 case GNUNET_FS_URI_SKS:
667 GNUNET_free (uri->data.sks.identifier);
669 case GNUNET_FS_URI_LOC:
680 * How many keywords are ANDed in this keyword URI?
682 * @param uri ksk uri to get the number of keywords from
683 * @return 0 if this is not a keyword URI
686 GNUNET_FS_uri_ksk_get_keyword_count (const struct GNUNET_FS_Uri *uri)
688 if (uri->type != GNUNET_FS_URI_KSK)
690 return uri->data.ksk.keywordCount;
695 * Iterate over all keywords in this keyword URI.
697 * @param uri ksk uri to get the keywords from
698 * @param iterator function to call on each keyword
699 * @param iterator_cls closure for iterator
700 * @return -1 if this is not a keyword URI, otherwise number of
701 * keywords iterated over until iterator aborted
704 GNUNET_FS_uri_ksk_get_keywords (const struct GNUNET_FS_Uri *uri,
705 GNUNET_FS_KeywordIterator iterator,
711 if (uri->type != GNUNET_FS_URI_KSK)
713 if (NULL == iterator)
714 return uri->data.ksk.keywordCount;
715 for (i = 0; i < uri->data.ksk.keywordCount; i++)
717 keyword = uri->data.ksk.keywords[i];
718 /* first character of keyword indicates
719 * if it is mandatory or not */
720 if (GNUNET_OK != iterator (iterator_cls, &keyword[1], keyword[0] == '+'))
728 * Add the given keyword to the set of keywords represented by the URI.
729 * Does nothing if the keyword is already present.
731 * @param uri ksk uri to modify
732 * @param keyword keyword to add
733 * @param is_mandatory is this keyword mandatory?
736 GNUNET_FS_uri_ksk_add_keyword (struct GNUNET_FS_Uri *uri,
744 GNUNET_assert (uri->type == GNUNET_FS_URI_KSK);
745 for (i = 0; i < uri->data.ksk.keywordCount; i++)
747 old = uri->data.ksk.keywords[i];
748 if (0 == strcmp (&old[1], keyword))
751 GNUNET_asprintf (&n, is_mandatory ? "+%s" : " %s", keyword);
752 GNUNET_array_append (uri->data.ksk.keywords, uri->data.ksk.keywordCount, n);
757 * Remove the given keyword from the set of keywords represented by the URI.
758 * Does nothing if the keyword is not present.
760 * @param uri ksk uri to modify
761 * @param keyword keyword to add
764 GNUNET_FS_uri_ksk_remove_keyword (struct GNUNET_FS_Uri *uri,
770 GNUNET_assert (uri->type == GNUNET_FS_URI_KSK);
771 for (i = 0; i < uri->data.ksk.keywordCount; i++)
773 old = uri->data.ksk.keywords[i];
774 if (0 == strcmp (&old[1], keyword))
776 uri->data.ksk.keywords[i] =
777 uri->data.ksk.keywords[uri->data.ksk.keywordCount - 1];
778 GNUNET_array_grow (uri->data.ksk.keywords, uri->data.ksk.keywordCount,
779 uri->data.ksk.keywordCount - 1);
788 * Obtain the identity of the peer offering the data
790 * @param uri the location URI to inspect
791 * @param peer where to store the identify of the peer (presumably) offering the content
792 * @return #GNUNET_SYSERR if this is not a location URI, otherwise #GNUNET_OK
795 GNUNET_FS_uri_loc_get_peer_identity (const struct GNUNET_FS_Uri *uri,
796 struct GNUNET_PeerIdentity *peer)
798 if (uri->type != GNUNET_FS_URI_LOC)
799 return GNUNET_SYSERR;
800 *peer = uri->data.loc.peer;
806 * Obtain the expiration of the LOC URI.
808 * @param uri location URI to get the expiration from
809 * @return expiration time of the URI
811 struct GNUNET_TIME_Absolute
812 GNUNET_FS_uri_loc_get_expiration (const struct GNUNET_FS_Uri *uri)
814 GNUNET_assert (uri->type == GNUNET_FS_URI_LOC);
815 return uri->data.loc.expirationTime;
820 * Obtain the URI of the content itself.
822 * @param uri location URI to get the content URI from
823 * @return NULL if argument is not a location URI
825 struct GNUNET_FS_Uri *
826 GNUNET_FS_uri_loc_get_uri (const struct GNUNET_FS_Uri *uri)
828 struct GNUNET_FS_Uri *ret;
830 if (uri->type != GNUNET_FS_URI_LOC)
832 ret = GNUNET_new (struct GNUNET_FS_Uri);
833 ret->type = GNUNET_FS_URI_CHK;
834 ret->data.chk = uri->data.loc.fi;
840 * Construct a location URI (this peer will be used for the location).
842 * @param baseUri content offered by the sender
843 * @param cfg configuration information (used to find our hostkey)
844 * @param expiration_time how long will the content be offered?
845 * @return the location URI, NULL on error
847 struct GNUNET_FS_Uri *
848 GNUNET_FS_uri_loc_create (const struct GNUNET_FS_Uri *baseUri,
849 const struct GNUNET_CONFIGURATION_Handle *cfg,
850 struct GNUNET_TIME_Absolute expiration_time)
852 struct GNUNET_FS_Uri *uri;
853 struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
854 struct GNUNET_CRYPTO_EddsaPublicKey my_public_key;
856 struct LocUriAssembly ass;
857 struct GNUNET_TIME_Absolute et;
859 if (baseUri->type != GNUNET_FS_URI_CHK)
862 GNUNET_CONFIGURATION_get_value_filename (cfg, "PEER", "PRIVATE_KEY",
865 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
866 _("Lacking key configuration settings.\n"));
869 if (NULL == (my_private_key = GNUNET_CRYPTO_eddsa_key_create_from_file (keyfile)))
871 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
872 _("Could not access hostkey file `%s'.\n"), keyfile);
873 GNUNET_free (keyfile);
876 GNUNET_free (keyfile);
877 /* we round expiration time to full seconds for SKS URIs */
878 et.abs_value_us = (expiration_time.abs_value_us / 1000000LL) * 1000000LL;
879 GNUNET_CRYPTO_eddsa_key_get_public (my_private_key, &my_public_key);
880 ass.purpose.size = htonl (sizeof (struct LocUriAssembly));
881 ass.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT);
882 ass.exptime = GNUNET_TIME_absolute_hton (et);
883 ass.fi = baseUri->data.chk;
884 ass.peer.public_key = my_public_key;
885 uri = GNUNET_new (struct GNUNET_FS_Uri);
886 uri->type = GNUNET_FS_URI_LOC;
887 uri->data.loc.fi = baseUri->data.chk;
888 uri->data.loc.expirationTime = et;
889 uri->data.loc.peer.public_key = my_public_key;
890 GNUNET_assert (GNUNET_OK ==
891 GNUNET_CRYPTO_eddsa_sign (my_private_key, &ass.purpose,
892 &uri->data.loc.contentSignature));
893 GNUNET_free (my_private_key);
899 * Create an SKS URI from a namespace ID and an identifier.
901 * @param ns namespace ID
902 * @param id identifier
903 * @return an FS URI for the given namespace and identifier
905 struct GNUNET_FS_Uri *
906 GNUNET_FS_uri_sks_create (const struct GNUNET_CRYPTO_EcdsaPublicKey *ns,
909 struct GNUNET_FS_Uri *ns_uri;
911 ns_uri = GNUNET_new (struct GNUNET_FS_Uri);
912 ns_uri->type = GNUNET_FS_URI_SKS;
913 ns_uri->data.sks.ns = *ns;
914 ns_uri->data.sks.identifier = GNUNET_strdup (id);
920 * Merge the sets of keywords from two KSK URIs.
921 * (useful for merging the canonicalized keywords with
922 * the original keywords for sharing).
924 * @param u1 first uri
925 * @param u2 second uri
926 * @return merged URI, NULL on error
928 struct GNUNET_FS_Uri *
929 GNUNET_FS_uri_ksk_merge (const struct GNUNET_FS_Uri *u1,
930 const struct GNUNET_FS_Uri *u2)
932 struct GNUNET_FS_Uri *ret;
940 if ((u1 == NULL) && (u2 == NULL))
943 return GNUNET_FS_uri_dup (u2);
945 return GNUNET_FS_uri_dup (u1);
946 if ((u1->type != GNUNET_FS_URI_KSK) || (u2->type != GNUNET_FS_URI_KSK))
951 kc = u1->data.ksk.keywordCount;
952 kl = GNUNET_malloc ((kc + u2->data.ksk.keywordCount) * sizeof (char *));
953 for (i = 0; i < u1->data.ksk.keywordCount; i++)
954 kl[i] = GNUNET_strdup (u1->data.ksk.keywords[i]);
955 for (i = 0; i < u2->data.ksk.keywordCount; i++)
957 kp = u2->data.ksk.keywords[i];
959 for (j = 0; j < u1->data.ksk.keywordCount; j++)
960 if (0 == strcmp (kp + 1, kl[j] + 1))
968 kl[kc++] = GNUNET_strdup (kp);
970 ret = GNUNET_new (struct GNUNET_FS_Uri);
971 ret->type = GNUNET_FS_URI_KSK;
972 ret->data.ksk.keywordCount = kc;
973 ret->data.ksk.keywords = kl;
981 * @param uri the URI to duplicate
982 * @return copy of the URI
984 struct GNUNET_FS_Uri *
985 GNUNET_FS_uri_dup (const struct GNUNET_FS_Uri *uri)
987 struct GNUNET_FS_Uri *ret;
992 ret = GNUNET_new (struct GNUNET_FS_Uri);
993 memcpy (ret, uri, sizeof (struct GNUNET_FS_Uri));
996 case GNUNET_FS_URI_KSK:
997 if (ret->data.ksk.keywordCount >=
998 GNUNET_MAX_MALLOC_CHECKED / sizeof (char *))
1004 if (ret->data.ksk.keywordCount > 0)
1006 ret->data.ksk.keywords =
1007 GNUNET_malloc (ret->data.ksk.keywordCount * sizeof (char *));
1008 for (i = 0; i < ret->data.ksk.keywordCount; i++)
1009 ret->data.ksk.keywords[i] = GNUNET_strdup (uri->data.ksk.keywords[i]);
1012 ret->data.ksk.keywords = NULL; /* just to be sure */
1014 case GNUNET_FS_URI_SKS:
1015 ret->data.sks.identifier = GNUNET_strdup (uri->data.sks.identifier);
1017 case GNUNET_FS_URI_LOC:
1027 * Create an FS URI from a single user-supplied string of keywords.
1028 * The string is broken up at spaces into individual keywords.
1029 * Keywords that start with "+" are mandatory. Double-quotes can
1030 * be used to prevent breaking up strings at spaces (and also
1031 * to specify non-mandatory keywords starting with "+").
1033 * Keywords must contain a balanced number of double quotes and
1034 * double quotes can not be used in the actual keywords (for
1035 * example, the string '""foo bar""' will be turned into two
1036 * "OR"ed keywords 'foo' and 'bar', not into '"foo bar"'.
1038 * @param keywords the keyword string
1039 * @param emsg where to store an error message
1040 * @return an FS URI for the given keywords, NULL
1041 * if keywords is not legal (i.e. empty).
1043 struct GNUNET_FS_Uri *
1044 GNUNET_FS_uri_ksk_create (const char *keywords,
1048 unsigned int num_Words;
1051 struct GNUNET_FS_Uri *uri;
1055 if (keywords == NULL)
1057 *emsg = GNUNET_strdup (_("No keywords specified!\n"));
1061 searchString = GNUNET_strdup (keywords);
1066 while ('\0' != *pos)
1068 if ((saw_quote == 0) && (isspace ((unsigned char) *pos)))
1072 else if (0 == inWord)
1078 saw_quote = (saw_quote + 1) % 2;
1083 GNUNET_free (searchString);
1084 *emsg = GNUNET_strdup (_("No keywords specified!\n"));
1089 GNUNET_free (searchString);
1090 *emsg = GNUNET_strdup (_("Number of double-quotes not balanced!\n"));
1093 keywordarr = GNUNET_malloc (num_Words * sizeof (char *));
1097 while ('\0' != *pos)
1099 if ((saw_quote == 0) && (isspace ((unsigned char) *pos)))
1104 else if (0 == inWord)
1106 keywordarr[num_Words] = pos;
1111 saw_quote = (saw_quote + 1) % 2;
1115 GNUNET_FS_uri_ksk_create_from_args (num_Words,
1116 (const char **) keywordarr);
1117 GNUNET_free (keywordarr);
1118 GNUNET_free (searchString);
1124 * Create an FS URI from a user-supplied command line of keywords.
1125 * Arguments should start with "+" to indicate mandatory
1128 * @param argc number of keywords
1129 * @param argv keywords (double quotes are not required for
1130 * keywords containing spaces; however, double
1131 * quotes are required for keywords starting with
1132 * "+"); there is no mechanism for having double
1133 * quotes in the actual keywords (if the user
1134 * did specifically specify double quotes, the
1135 * caller should convert each double quote
1136 * into two single quotes).
1137 * @return an FS URI for the given keywords, NULL
1138 * if keywords is not legal (i.e. empty).
1140 struct GNUNET_FS_Uri *
1141 GNUNET_FS_uri_ksk_create_from_args (unsigned int argc,
1145 struct GNUNET_FS_Uri *uri;
1146 const char *keyword;
1154 /* allow URI to be given as one and only keyword and
1155 * handle accordingly */
1157 if ((argc == 1) && (strlen (argv[0]) > strlen (GNUNET_FS_URI_PREFIX)) &&
1159 strncmp (argv[0], GNUNET_FS_URI_PREFIX, strlen (GNUNET_FS_URI_PREFIX)))
1160 && (NULL != (uri = GNUNET_FS_uri_parse (argv[0], &emsg))))
1162 GNUNET_free_non_null (emsg);
1163 uri = GNUNET_new (struct GNUNET_FS_Uri);
1164 uri->type = GNUNET_FS_URI_KSK;
1165 uri->data.ksk.keywordCount = argc;
1166 uri->data.ksk.keywords = GNUNET_malloc (argc * sizeof (char *));
1167 for (i = 0; i < argc; i++)
1170 if (keyword[0] == '+')
1171 val = GNUNET_strdup (keyword);
1173 GNUNET_asprintf (&val, " %s", keyword);
1184 uri->data.ksk.keywords[i] = val;
1191 * Test if two URIs are equal.
1193 * @param u1 one of the URIs
1194 * @param u2 the other URI
1195 * @return #GNUNET_YES if the URIs are equal
1198 GNUNET_FS_uri_test_equal (const struct GNUNET_FS_Uri *u1,
1199 const struct GNUNET_FS_Uri *u2)
1205 GNUNET_assert (u1 != NULL);
1206 GNUNET_assert (u2 != NULL);
1207 if (u1->type != u2->type)
1211 case GNUNET_FS_URI_CHK:
1213 memcmp (&u1->data.chk, &u2->data.chk, sizeof (struct FileIdentifier)))
1216 case GNUNET_FS_URI_SKS:
1218 memcmp (&u1->data.sks.ns, &u2->data.sks.ns,
1219 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey))) &&
1220 (0 == strcmp (u1->data.sks.identifier, u2->data.sks.identifier)))
1224 case GNUNET_FS_URI_KSK:
1225 if (u1->data.ksk.keywordCount != u2->data.ksk.keywordCount)
1227 for (i = 0; i < u1->data.ksk.keywordCount; i++)
1230 for (j = 0; j < u2->data.ksk.keywordCount; j++)
1232 if (0 == strcmp (u1->data.ksk.keywords[i], u2->data.ksk.keywords[j]))
1238 if (ret == GNUNET_NO)
1242 case GNUNET_FS_URI_LOC:
1244 (&u1->data.loc, &u2->data.loc,
1245 sizeof (struct FileIdentifier) +
1246 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey) +
1247 sizeof (struct GNUNET_TIME_Absolute) + sizeof (unsigned short) +
1248 sizeof (unsigned short)) != 0)
1258 * Is this a namespace URI?
1260 * @param uri the uri to check
1261 * @return #GNUNET_YES if this is an SKS uri
1264 GNUNET_FS_uri_test_sks (const struct GNUNET_FS_Uri *uri)
1266 return uri->type == GNUNET_FS_URI_SKS;
1271 * Get the ID of a namespace from the given
1274 * @param uri the uri to get the namespace ID from
1275 * @param pseudonym where to store the ID of the namespace
1276 * @return #GNUNET_OK on success
1279 GNUNET_FS_uri_sks_get_namespace (const struct GNUNET_FS_Uri *uri,
1280 struct GNUNET_CRYPTO_EcdsaPublicKey *pseudonym)
1282 if (!GNUNET_FS_uri_test_sks (uri))
1285 return GNUNET_SYSERR;
1287 *pseudonym = uri->data.sks.ns;
1293 * Get the content identifier of an SKS URI.
1295 * @param uri the sks uri
1296 * @return NULL on error (not a valid SKS URI)
1299 GNUNET_FS_uri_sks_get_content_id (const struct GNUNET_FS_Uri *uri)
1301 if (!GNUNET_FS_uri_test_sks (uri))
1306 return GNUNET_strdup (uri->data.sks.identifier);
1311 * Is this a keyword URI?
1313 * @param uri the uri
1314 * @return #GNUNET_YES if this is a KSK uri
1317 GNUNET_FS_uri_test_ksk (const struct GNUNET_FS_Uri *uri)
1322 if (uri->type == GNUNET_FS_URI_KSK)
1324 for (i=0;i < uri->data.ksk.keywordCount; i++)
1325 GNUNET_assert (uri->data.ksk.keywords[i] != NULL);
1328 return uri->type == GNUNET_FS_URI_KSK;
1333 * Is this a file (or directory) URI?
1335 * @param uri the uri to check
1336 * @return #GNUNET_YES if this is a CHK uri
1339 GNUNET_FS_uri_test_chk (const struct GNUNET_FS_Uri *uri)
1341 return uri->type == GNUNET_FS_URI_CHK;
1346 * What is the size of the file that this URI
1349 * @param uri the CHK URI to inspect
1350 * @return size of the file as specified in the CHK URI
1353 GNUNET_FS_uri_chk_get_file_size (const struct GNUNET_FS_Uri * uri)
1357 case GNUNET_FS_URI_CHK:
1358 return GNUNET_ntohll (uri->data.chk.file_length);
1359 case GNUNET_FS_URI_LOC:
1360 return GNUNET_ntohll (uri->data.loc.fi.file_length);
1364 return 0; /* unreachable */
1369 * Is this a location URI?
1371 * @param uri the uri to check
1372 * @return #GNUNET_YES if this is a LOC uri
1375 GNUNET_FS_uri_test_loc (const struct GNUNET_FS_Uri *uri)
1377 return uri->type == GNUNET_FS_URI_LOC;
1382 * Add a keyword as non-mandatory (with ' '-prefix) to the
1383 * given keyword list at offset 'index'. The array is
1384 * guaranteed to be long enough.
1386 * @param s keyword to add
1387 * @param array array to add the keyword to
1388 * @param index offset where to add the keyword
1391 insert_non_mandatory_keyword (const char *s,
1397 GNUNET_asprintf (&nkword,
1398 " %s", /* space to mark as 'non mandatory' */
1400 array[index] = nkword;
1405 * Test if the given keyword @a s is already present in the
1406 * given array, ignoring the '+'-mandatory prefix in the array.
1408 * @param s keyword to test
1409 * @param array keywords to test against, with ' ' or '+' prefix to ignore
1410 * @param array_length length of the @a array
1411 * @return #GNUNET_YES if the keyword exists, #GNUNET_NO if not
1414 find_duplicate (const char *s,
1420 for (j = array_length - 1; j >= 0; j--)
1421 if (0 == strcmp (&array[j][1], s))
1431 normalize_metadata (enum EXTRACTOR_MetaFormat format,
1435 uint8_t *free_str = NULL;
1436 uint8_t *str_to_normalize = (uint8_t *) data;
1437 uint8_t *normalized;
1439 if (str_to_normalize == NULL)
1441 /* Don't trust libextractor */
1442 if (format == EXTRACTOR_METAFORMAT_UTF8)
1444 free_str = (uint8_t *) u8_check ((const uint8_t *) data, data_len);
1445 if (free_str == NULL)
1448 format = EXTRACTOR_METAFORMAT_C_STRING;
1450 if (format == EXTRACTOR_METAFORMAT_C_STRING)
1452 free_str = u8_strconv_from_encoding (data, locale_charset (), iconveh_escape_sequence);
1453 if (free_str == NULL)
1457 normalized = u8_tolower (str_to_normalize, strlen ((char *) str_to_normalize), NULL, UNINORM_NFD, NULL, &r_len);
1458 /* free_str is allocated by libunistring internally, use free() */
1459 if (free_str != NULL)
1461 if (normalized != NULL)
1463 /* u8_tolower allocates a non-NULL-terminated string! */
1464 free_str = GNUNET_malloc (r_len + 1);
1465 memcpy (free_str, normalized, r_len);
1466 free_str[r_len] = '\0';
1468 normalized = free_str;
1470 return (char *) normalized;
1475 * Counts the number of UTF-8 characters (not bytes) in the string,
1476 * returns that count.
1479 u8_strcount (const uint8_t *s)
1483 GNUNET_assert (s != NULL);
1486 for (count = 0; s != NULL; count++)
1487 s = u8_next (&c, s);
1493 * Break the filename up by matching [], () and {} pairs to make
1494 * keywords. In case of nesting parentheses only the inner pair counts.
1495 * You can't escape parentheses to scan something like "[blah\{foo]" to
1496 * make a "blah{foo" keyword, this function is only a heuristic!
1498 * @param s string to break down.
1499 * @param array array to fill with enclosed tokens. If NULL, then tokens
1501 * @param index index at which to start filling the array (entries prior
1502 * to it are used to check for duplicates). ignored if @a array == NULL.
1503 * @return number of tokens counted (including duplicates), or number of
1504 * tokens extracted (excluding duplicates). 0 if there are no
1505 * matching parens in the string (when counting), or when all tokens
1506 * were duplicates (when extracting).
1509 get_keywords_from_parens (const char *s,
1521 ss = GNUNET_strdup (s);
1522 open_paren = ss - 1;
1523 while (NULL != (open_paren = strpbrk (open_paren + 1, "[{(")))
1527 close_paren = strpbrk (open_paren + 1, "]})");
1528 if (NULL == close_paren)
1530 switch (open_paren[0])
1533 if (']' == close_paren[0])
1537 if ('}' == close_paren[0])
1541 if (')' == close_paren[0])
1547 if (match && (close_paren - open_paren > 1))
1549 tmp = close_paren[0];
1550 close_paren[0] = '\0';
1551 /* Keywords must be at least 3 characters long */
1552 if (u8_strcount ((const uint8_t *) &open_paren[1]) <= 2)
1554 close_paren[0] = tmp;
1560 if (GNUNET_NO == find_duplicate ((const char *) &open_paren[1],
1561 (const char **) array, index + count))
1563 insert_non_mandatory_keyword ((const char *) &open_paren[1], array,
1567 normalized = normalize_metadata (EXTRACTOR_METAFORMAT_UTF8,
1568 &open_paren[1], close_paren - &open_paren[1]);
1569 if (normalized != NULL)
1571 if (GNUNET_NO == find_duplicate ((const char *) normalized,
1572 (const char **) array, index + count))
1574 insert_non_mandatory_keyword ((const char *) normalized, array,
1578 GNUNET_free (normalized);
1583 close_paren[0] = tmp;
1592 * Where to break up keywords
1594 #define TOKENS "_. /-!?#&+@\"\'\\;:,()[]{}$<>|"
1597 * Break the filename up by TOKENS to make
1600 * @param s string to break down.
1601 * @param array array to fill with tokens. If NULL, then tokens are only
1603 * @param index index at which to start filling the array (entries prior
1604 * to it are used to check for duplicates). ignored if @a array == NULL.
1605 * @return number of tokens (>1) counted (including duplicates), or number of
1606 * tokens extracted (excluding duplicates). 0 if there are no
1607 * separators in the string (when counting), or when all tokens were
1608 * duplicates (when extracting).
1611 get_keywords_from_tokens (const char *s,
1619 ss = GNUNET_strdup (s);
1620 for (p = strtok (ss, TOKENS); p != NULL; p = strtok (NULL, TOKENS))
1622 /* Keywords must be at least 3 characters long */
1623 if (u8_strcount ((const uint8_t *) p) <= 2)
1628 if (GNUNET_NO == find_duplicate (p, (const char **) array, index + seps))
1630 insert_non_mandatory_keyword (p, array,
1634 normalized = normalize_metadata (EXTRACTOR_METAFORMAT_UTF8,
1636 if (normalized != NULL)
1638 if (GNUNET_NO == find_duplicate ((const char *) normalized,
1639 (const char **) array, index + seps))
1641 insert_non_mandatory_keyword ((const char *) normalized, array,
1645 GNUNET_free (normalized);
1658 * Function called on each value in the meta data.
1659 * Adds it to the URI.
1661 * @param cls URI to update
1662 * @param plugin_name name of the plugin that produced this value;
1663 * special values can be used (i.e. '<zlib>' for zlib being
1664 * used in the main libextractor library and yielding
1666 * @param type libextractor-type describing the meta data
1667 * @param format basic format information about data
1668 * @param data_mime_type mime-type of data (not of the original file);
1669 * can be NULL (if mime-type is not known)
1670 * @param data actual meta-data found
1671 * @param data_len number of bytes in @a data
1672 * @return 0 (always)
1675 gather_uri_data (void *cls, const char *plugin_name,
1676 enum EXTRACTOR_MetaType type,
1677 enum EXTRACTOR_MetaFormat format,
1678 const char *data_mime_type,
1682 struct GNUNET_FS_Uri *uri = cls;
1683 char *normalized_data;
1686 if ((format != EXTRACTOR_METAFORMAT_UTF8) &&
1687 (format != EXTRACTOR_METAFORMAT_C_STRING))
1689 /* Keywords must be at least 3 characters long
1690 * If given non-utf8 string it will, most likely, find it to be invalid,
1691 * and will return the length of its valid part, skipping the keyword.
1692 * If it does - fix the extractor, not this check!
1694 if (u8_strcount ((const uint8_t *) data) <= 2)
1696 if ( (EXTRACTOR_METATYPE_MIMETYPE == type) &&
1697 (NULL != (sep = memchr (data, '/', data_len))) &&
1702 GNUNET_asprintf (&xtra,
1706 if (! find_duplicate (xtra,
1707 (const char **) uri->data.ksk.keywords,
1708 uri->data.ksk.keywordCount))
1710 insert_non_mandatory_keyword (xtra,
1711 uri->data.ksk.keywords,
1712 uri->data.ksk.keywordCount);
1713 uri->data.ksk.keywordCount++;
1718 normalized_data = normalize_metadata (format, data, data_len);
1719 if (! find_duplicate (data,
1720 (const char **) uri->data.ksk.keywords,
1721 uri->data.ksk.keywordCount))
1723 insert_non_mandatory_keyword (data,
1724 uri->data.ksk.keywords, uri->data.ksk.keywordCount);
1725 uri->data.ksk.keywordCount++;
1727 if (NULL != normalized_data)
1729 if (! find_duplicate (normalized_data,
1730 (const char **) uri->data.ksk.keywords,
1731 uri->data.ksk.keywordCount))
1733 insert_non_mandatory_keyword (normalized_data,
1734 uri->data.ksk.keywords, uri->data.ksk.keywordCount);
1735 uri->data.ksk.keywordCount++;
1737 GNUNET_free (normalized_data);
1744 * Construct a keyword-URI from meta-data (take all entries
1745 * in the meta-data and construct one large keyword URI
1746 * that lists all keywords that can be found in the meta-data).
1748 * @param md metadata to use
1749 * @return NULL on error, otherwise a KSK URI
1751 struct GNUNET_FS_Uri *
1752 GNUNET_FS_uri_ksk_create_from_meta_data (const struct GNUNET_CONTAINER_MetaData *md)
1754 struct GNUNET_FS_Uri *ret;
1756 char *full_name = NULL;
1759 int tok_keywords = 0;
1760 int paren_keywords = 0;
1764 ret = GNUNET_new (struct GNUNET_FS_Uri);
1765 ret->type = GNUNET_FS_URI_KSK;
1766 ent = GNUNET_CONTAINER_meta_data_iterate (md, NULL, NULL);
1769 full_name = GNUNET_CONTAINER_meta_data_get_first_by_types (md,
1770 EXTRACTOR_METATYPE_GNUNET_ORIGINAL_FILENAME, -1);
1771 if (NULL != full_name)
1773 filename = full_name;
1774 while (NULL != (ss = strstr (filename, DIR_SEPARATOR_STR)))
1776 tok_keywords = get_keywords_from_tokens (filename, NULL, 0);
1777 paren_keywords = get_keywords_from_parens (filename, NULL, 0);
1779 /* x3 because there might be a normalized variant of every keyword,
1780 plus theoretically one more for mime... */
1781 ret->data.ksk.keywords = GNUNET_malloc
1782 (sizeof (char *) * (ent + tok_keywords + paren_keywords) * 3);
1783 GNUNET_CONTAINER_meta_data_iterate (md, &gather_uri_data, ret);
1785 if (tok_keywords > 0)
1786 ret->data.ksk.keywordCount += get_keywords_from_tokens (filename,
1787 ret->data.ksk.keywords,
1788 ret->data.ksk.keywordCount);
1789 if (paren_keywords > 0)
1790 ret->data.ksk.keywordCount += get_keywords_from_parens (filename,
1791 ret->data.ksk.keywords,
1792 ret->data.ksk.keywordCount);
1794 GNUNET_free_non_null (full_name);
1800 * In URI-encoding, does the given character
1801 * need to be encoded using %-encoding?
1804 needs_percent (char c)
1807 ((isalnum ((unsigned char) c)) || (c == '-') || (c == '_') ||
1808 (c == '.') || (c == '~')));
1813 * Convert a KSK URI to a string.
1815 * @param uri the URI to convert
1816 * @return NULL on error (i.e. keywordCount == 0)
1819 uri_ksk_to_string (const struct GNUNET_FS_Uri *uri)
1822 unsigned int keywordCount;
1829 const char *keyword;
1831 if (uri->type != GNUNET_FS_URI_KSK)
1833 keywords = uri->data.ksk.keywords;
1834 keywordCount = uri->data.ksk.keywordCount;
1835 n = keywordCount + strlen (GNUNET_FS_URI_PREFIX) +
1836 strlen (GNUNET_FS_URI_KSK_INFIX) + 1;
1837 for (i = 0; i < keywordCount; i++)
1839 keyword = keywords[i];
1840 slen = strlen (keyword);
1842 for (j = 0; j < slen; j++)
1844 if ((j == 0) && (keyword[j] == ' '))
1847 continue; /* skip leading space */
1849 if (needs_percent (keyword[j]))
1850 n += 2; /* will use %-encoding */
1853 ret = GNUNET_malloc (n);
1854 strcpy (ret, GNUNET_FS_URI_PREFIX);
1855 strcat (ret, GNUNET_FS_URI_KSK_INFIX);
1856 wpos = strlen (ret);
1857 for (i = 0; i < keywordCount; i++)
1859 keyword = keywords[i];
1860 slen = strlen (keyword);
1861 for (j = 0; j < slen; j++)
1863 if ((j == 0) && (keyword[j] == ' '))
1864 continue; /* skip leading space */
1865 if (needs_percent (keyword[j]))
1867 sprintf (&ret[wpos], "%%%02X", (unsigned char) keyword[j]);
1872 ret[wpos++] = keyword[j];
1875 if (i != keywordCount - 1)
1883 * Convert SKS URI to a string.
1885 * @param uri sks uri to convert
1886 * @return NULL on error
1889 uri_sks_to_string (const struct GNUNET_FS_Uri *uri)
1894 if (GNUNET_FS_URI_SKS != uri->type)
1896 ret = GNUNET_STRINGS_data_to_string (&uri->data.sks.ns,
1897 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
1900 GNUNET_assert (NULL != ret);
1902 GNUNET_asprintf (&ret, "%s%s%s/%s", GNUNET_FS_URI_PREFIX,
1903 GNUNET_FS_URI_SKS_INFIX, buf,
1904 uri->data.sks.identifier);
1910 * Convert a CHK URI to a string.
1912 * @param uri chk uri to convert
1913 * @return NULL on error
1916 uri_chk_to_string (const struct GNUNET_FS_Uri *uri)
1918 const struct FileIdentifier *fi;
1920 struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1921 struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1923 if (uri->type != GNUNET_FS_URI_CHK)
1925 fi = &uri->data.chk;
1926 GNUNET_CRYPTO_hash_to_enc (&fi->chk.key, &keyhash);
1927 GNUNET_CRYPTO_hash_to_enc (&fi->chk.query, &queryhash);
1929 GNUNET_asprintf (&ret, "%s%s%s.%s.%llu", GNUNET_FS_URI_PREFIX,
1930 GNUNET_FS_URI_CHK_INFIX, (const char *) &keyhash,
1931 (const char *) &queryhash, GNUNET_ntohll (fi->file_length));
1937 * Convert a LOC URI to a string.
1939 * @param uri loc uri to convert
1940 * @return NULL on error
1943 uri_loc_to_string (const struct GNUNET_FS_Uri *uri)
1946 struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1947 struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1949 char peer_sig[SIGNATURE_ASCII_LENGTH + 1];
1951 GNUNET_CRYPTO_hash_to_enc (&uri->data.loc.fi.chk.key, &keyhash);
1952 GNUNET_CRYPTO_hash_to_enc (&uri->data.loc.fi.chk.query, &queryhash);
1954 GNUNET_CRYPTO_eddsa_public_key_to_string (&uri->data.loc.peer.public_key);
1955 GNUNET_assert (NULL !=
1956 GNUNET_STRINGS_data_to_string (&uri->data.loc.contentSignature,
1957 sizeof (struct GNUNET_CRYPTO_EddsaSignature),
1959 sizeof (peer_sig)));
1960 GNUNET_asprintf (&ret,
1961 "%s%s%s.%s.%llu.%s.%s.%llu", GNUNET_FS_URI_PREFIX,
1962 GNUNET_FS_URI_LOC_INFIX, (const char *) &keyhash,
1963 (const char *) &queryhash,
1964 (unsigned long long) GNUNET_ntohll (uri->data.loc.
1968 (unsigned long long) uri->data.loc.expirationTime.abs_value_us / 1000000LL);
1969 GNUNET_free (peer_id);
1975 * Convert a URI to a UTF-8 String.
1977 * @param uri uri to convert to a string
1978 * @return the UTF-8 string
1981 GNUNET_FS_uri_to_string (const struct GNUNET_FS_Uri *uri)
1990 case GNUNET_FS_URI_KSK:
1991 return uri_ksk_to_string (uri);
1992 case GNUNET_FS_URI_SKS:
1993 return uri_sks_to_string (uri);
1994 case GNUNET_FS_URI_CHK:
1995 return uri_chk_to_string (uri);
1996 case GNUNET_FS_URI_LOC:
1997 return uri_loc_to_string (uri);
2004 /* end of fs_uri.c */