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;
321 if ((dup[i] == '+') && (saw_quote == 0))
323 keywords[--max] = percent_decode_keyword (&dup[i + 1], emsg);
324 if (NULL == keywords[max])
329 keywords[--max] = percent_decode_keyword (&dup[pos], emsg);
330 if (NULL == keywords[max])
332 GNUNET_assert (0 == max);
334 ret = GNUNET_new (struct GNUNET_FS_Uri);
335 ret->type = GNUNET_FS_URI_KSK;
336 ret->data.ksk.keywordCount = iret;
337 ret->data.ksk.keywords = keywords;
340 for (i = 0; i < max; i++)
341 GNUNET_free_non_null (keywords[i]);
342 GNUNET_free (keywords);
348 #define GNUNET_FS_URI_SKS_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_SKS_INFIX
353 * @param s an uri string
354 * @param emsg where to store the parser error message (if any)
355 * @return NULL on error, SKS URI otherwise
357 static struct GNUNET_FS_Uri *
358 uri_sks_parse (const char *s,
361 struct GNUNET_FS_Uri *ret;
362 struct GNUNET_CRYPTO_EcdsaPublicKey ns;
366 GNUNET_assert (s != NULL);
367 pos = strlen (GNUNET_FS_URI_SKS_PREFIX);
368 if ((strlen (s) <= pos) || (0 != strncmp (s, GNUNET_FS_URI_SKS_PREFIX, pos)))
369 return NULL; /* not an SKS URI */
370 end = strchr (&s[pos], '/');
371 if ( (NULL == end) ||
373 GNUNET_STRINGS_string_to_data (&s[pos],
378 *emsg = GNUNET_strdup (_("Malformed SKS URI (wrong syntax)"));
379 return NULL; /* malformed */
381 end++; /* skip over '/' */
382 ret = GNUNET_new (struct GNUNET_FS_Uri);
383 ret->type = GNUNET_FS_URI_SKS;
384 ret->data.sks.ns = ns;
385 ret->data.sks.identifier = GNUNET_strdup (end);
389 #define GNUNET_FS_URI_CHK_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_CHK_INFIX
395 * @param s an uri string
396 * @param emsg where to store the parser error message (if any)
397 * @return NULL on error, CHK URI otherwise
399 static struct GNUNET_FS_Uri *
400 uri_chk_parse (const char *s,
403 struct GNUNET_FS_Uri *ret;
404 struct FileIdentifier fi;
406 unsigned long long flen;
408 char h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
409 char h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
413 GNUNET_assert (s != NULL);
415 pos = strlen (GNUNET_FS_URI_CHK_PREFIX);
416 if ((slen < pos + 2 * sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
417 (0 != strncmp (s, GNUNET_FS_URI_CHK_PREFIX, pos)))
418 return NULL; /* not a CHK URI */
419 if ((s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
420 (s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
422 *emsg = GNUNET_strdup (_("Malformed CHK URI (wrong syntax)"));
425 memcpy (h1, &s[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
426 h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
427 memcpy (h2, &s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)],
428 sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
429 h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
431 if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &fi.chk.key)) ||
432 (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &fi.chk.query)) ||
434 SSCANF (&s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
437 *emsg = GNUNET_strdup (_("Malformed CHK URI (failed to decode CHK)"));
440 fi.file_length = GNUNET_htonll (flen);
441 ret = GNUNET_new (struct GNUNET_FS_Uri);
442 ret->type = GNUNET_FS_URI_CHK;
448 GNUNET_NETWORK_STRUCT_BEGIN
450 * Structure that defines how the contents of a location URI must be
451 * assembled in memory to create or verify the signature of a location
454 struct LocUriAssembly
457 * What is being signed (rest of this struct).
459 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
462 * Expiration time of the offer.
464 struct GNUNET_TIME_AbsoluteNBO exptime;
467 * File being offered.
469 struct FileIdentifier fi;
472 * Peer offering the file.
474 struct GNUNET_PeerIdentity peer;
477 GNUNET_NETWORK_STRUCT_END
480 #define GNUNET_FS_URI_LOC_PREFIX GNUNET_FS_URI_PREFIX GNUNET_FS_URI_LOC_INFIX
482 #define SIGNATURE_ASCII_LENGTH 103
486 * Also verifies validity of the location URI.
488 * @param s an uri string
489 * @param emsg where to store the parser error message (if any)
490 * @return NULL on error, valid LOC URI otherwise
492 static struct GNUNET_FS_Uri *
493 uri_loc_parse (const char *s,
496 struct GNUNET_FS_Uri *uri;
497 char h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
498 char h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)];
501 unsigned long long exptime;
502 unsigned long long flen;
503 struct GNUNET_TIME_Absolute et;
504 struct GNUNET_CRYPTO_EddsaSignature sig;
505 struct LocUriAssembly ass;
509 pos = strlen (GNUNET_FS_URI_LOC_PREFIX);
510 if ((slen < pos + 2 * sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
511 (0 != strncmp (s, GNUNET_FS_URI_LOC_PREFIX, pos)))
512 return NULL; /* not a LOC URI */
513 if ((s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
514 (s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
516 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax)"));
519 memcpy (h1, &s[pos], sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
520 h1[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
521 memcpy (h2, &s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded)],
522 sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded));
523 h2[sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
525 if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &ass.fi.chk.key)) ||
526 (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &ass.fi.chk.query)) ||
528 SSCANF (&s[pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
531 *emsg = GNUNET_strdup (_("LOC URI malformed (no CHK)"));
534 ass.fi.file_length = GNUNET_htonll (flen);
536 npos = pos + sizeof (struct GNUNET_CRYPTO_HashAsciiEncoded) * 2;
537 while ((s[npos] != '\0') && (s[npos] != '.'))
541 *emsg = GNUNET_strdup (_("LOC URI malformed (missing LOC)"));
545 if ( (strlen (&s[npos]) <= GNUNET_CRYPTO_PKEY_ASCII_LENGTH + 1) ||
546 ('.' != s[npos+GNUNET_CRYPTO_PKEY_ASCII_LENGTH]) )
549 GNUNET_strdup (_("LOC URI malformed (wrong syntax for public key)"));
552 GNUNET_CRYPTO_eddsa_public_key_from_string (&s[npos],
553 GNUNET_CRYPTO_PKEY_ASCII_LENGTH,
554 &ass.peer.public_key))
557 GNUNET_strdup (_("LOC URI malformed (could not decode public key)"));
560 npos += GNUNET_CRYPTO_PKEY_ASCII_LENGTH;
561 if (s[npos++] != '.')
563 *emsg = GNUNET_strdup (_("LOC URI malformed (could not find signature)"));
566 if ( (strlen (&s[npos]) <= SIGNATURE_ASCII_LENGTH + 1) ||
567 ('.' != s[npos + SIGNATURE_ASCII_LENGTH]) )
569 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax for signature)"));
573 GNUNET_STRINGS_string_to_data (&s[npos],
574 SIGNATURE_ASCII_LENGTH,
576 sizeof (struct GNUNET_CRYPTO_EddsaSignature)))
578 *emsg = GNUNET_strdup (_("LOC URI malformed (could not decode signature)"));
581 npos += SIGNATURE_ASCII_LENGTH;
582 if (s[npos++] != '.')
584 *emsg = GNUNET_strdup (_("LOC URI malformed (wrong syntax for expiration time)"));
587 if (1 != SSCANF (&s[npos], "%llu", &exptime))
590 GNUNET_strdup (_("LOC URI malformed (could not parse expiration time)"));
593 ass.purpose.size = htonl (sizeof (struct LocUriAssembly));
594 ass.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT);
595 et.abs_value_us = exptime * 1000LL * 1000LL;
596 ass.exptime = GNUNET_TIME_absolute_hton (et);
598 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT,
599 &ass.purpose, &sig, &ass.peer.public_key))
602 GNUNET_strdup (_("LOC URI malformed (signature failed validation)"));
605 uri = GNUNET_new (struct GNUNET_FS_Uri);
606 uri->type = GNUNET_FS_URI_LOC;
607 uri->data.loc.fi = ass.fi;
608 uri->data.loc.peer = ass.peer;
609 uri->data.loc.expirationTime = et;
610 uri->data.loc.contentSignature = sig;
619 * Convert a UTF-8 String to a URI.
621 * @param uri string to parse
622 * @param emsg where to store the parser error message (if any)
623 * @return NULL on error
625 struct GNUNET_FS_Uri *
626 GNUNET_FS_uri_parse (const char *uri,
629 struct GNUNET_FS_Uri *ret;
635 if ((NULL != (ret = uri_chk_parse (uri, emsg))) ||
636 (NULL != (ret = uri_ksk_parse (uri, emsg))) ||
637 (NULL != (ret = uri_sks_parse (uri, emsg))) ||
638 (NULL != (ret = uri_loc_parse (uri, emsg))))
641 *emsg = GNUNET_strdup (_("Unrecognized URI type"));
651 * @param uri uri to free
654 GNUNET_FS_uri_destroy (struct GNUNET_FS_Uri *uri)
660 case GNUNET_FS_URI_KSK:
661 for (i = 0; i < uri->data.ksk.keywordCount; i++)
662 GNUNET_free (uri->data.ksk.keywords[i]);
663 GNUNET_array_grow (uri->data.ksk.keywords, uri->data.ksk.keywordCount, 0);
665 case GNUNET_FS_URI_SKS:
666 GNUNET_free (uri->data.sks.identifier);
668 case GNUNET_FS_URI_LOC:
679 * How many keywords are ANDed in this keyword URI?
681 * @param uri ksk uri to get the number of keywords from
682 * @return 0 if this is not a keyword URI
685 GNUNET_FS_uri_ksk_get_keyword_count (const struct GNUNET_FS_Uri *uri)
687 if (uri->type != GNUNET_FS_URI_KSK)
689 return uri->data.ksk.keywordCount;
694 * Iterate over all keywords in this keyword URI.
696 * @param uri ksk uri to get the keywords from
697 * @param iterator function to call on each keyword
698 * @param iterator_cls closure for iterator
699 * @return -1 if this is not a keyword URI, otherwise number of
700 * keywords iterated over until iterator aborted
703 GNUNET_FS_uri_ksk_get_keywords (const struct GNUNET_FS_Uri *uri,
704 GNUNET_FS_KeywordIterator iterator,
710 if (uri->type != GNUNET_FS_URI_KSK)
712 if (NULL == iterator)
713 return uri->data.ksk.keywordCount;
714 for (i = 0; i < uri->data.ksk.keywordCount; i++)
716 keyword = uri->data.ksk.keywords[i];
717 /* first character of keyword indicates
718 * if it is mandatory or not */
719 if (GNUNET_OK != iterator (iterator_cls, &keyword[1], keyword[0] == '+'))
727 * Add the given keyword to the set of keywords represented by the URI.
728 * Does nothing if the keyword is already present.
730 * @param uri ksk uri to modify
731 * @param keyword keyword to add
732 * @param is_mandatory is this keyword mandatory?
735 GNUNET_FS_uri_ksk_add_keyword (struct GNUNET_FS_Uri *uri,
743 GNUNET_assert (uri->type == GNUNET_FS_URI_KSK);
744 for (i = 0; i < uri->data.ksk.keywordCount; i++)
746 old = uri->data.ksk.keywords[i];
747 if (0 == strcmp (&old[1], keyword))
750 GNUNET_asprintf (&n, is_mandatory ? "+%s" : " %s", keyword);
751 GNUNET_array_append (uri->data.ksk.keywords, uri->data.ksk.keywordCount, n);
756 * Remove the given keyword from the set of keywords represented by the URI.
757 * Does nothing if the keyword is not present.
759 * @param uri ksk uri to modify
760 * @param keyword keyword to add
763 GNUNET_FS_uri_ksk_remove_keyword (struct GNUNET_FS_Uri *uri,
769 GNUNET_assert (uri->type == GNUNET_FS_URI_KSK);
770 for (i = 0; i < uri->data.ksk.keywordCount; i++)
772 old = uri->data.ksk.keywords[i];
773 if (0 == strcmp (&old[1], keyword))
775 uri->data.ksk.keywords[i] =
776 uri->data.ksk.keywords[uri->data.ksk.keywordCount - 1];
777 GNUNET_array_grow (uri->data.ksk.keywords, uri->data.ksk.keywordCount,
778 uri->data.ksk.keywordCount - 1);
787 * Obtain the identity of the peer offering the data
789 * @param uri the location URI to inspect
790 * @param peer where to store the identify of the peer (presumably) offering the content
791 * @return #GNUNET_SYSERR if this is not a location URI, otherwise #GNUNET_OK
794 GNUNET_FS_uri_loc_get_peer_identity (const struct GNUNET_FS_Uri *uri,
795 struct GNUNET_PeerIdentity *peer)
797 if (uri->type != GNUNET_FS_URI_LOC)
798 return GNUNET_SYSERR;
799 *peer = uri->data.loc.peer;
805 * Obtain the expiration of the LOC URI.
807 * @param uri location URI to get the expiration from
808 * @return expiration time of the URI
810 struct GNUNET_TIME_Absolute
811 GNUNET_FS_uri_loc_get_expiration (const struct GNUNET_FS_Uri *uri)
813 GNUNET_assert (uri->type == GNUNET_FS_URI_LOC);
814 return uri->data.loc.expirationTime;
819 * Obtain the URI of the content itself.
821 * @param uri location URI to get the content URI from
822 * @return NULL if argument is not a location URI
824 struct GNUNET_FS_Uri *
825 GNUNET_FS_uri_loc_get_uri (const struct GNUNET_FS_Uri *uri)
827 struct GNUNET_FS_Uri *ret;
829 if (uri->type != GNUNET_FS_URI_LOC)
831 ret = GNUNET_new (struct GNUNET_FS_Uri);
832 ret->type = GNUNET_FS_URI_CHK;
833 ret->data.chk = uri->data.loc.fi;
839 * Construct a location URI (this peer will be used for the location).
840 * This function should only be called from within gnunet-service-fs,
841 * as it requires the peer's private key which is generally unavailable
842 * to processes directly under the user's control. However, for
843 * testing and as it logically fits under URIs, it is in this API.
845 * @param base_uri content offered by the sender
846 * @param sign_key private key of the peer
847 * @param expiration_time how long will the content be offered?
848 * @return the location URI, NULL on error
850 struct GNUNET_FS_Uri *
851 GNUNET_FS_uri_loc_create (const struct GNUNET_FS_Uri *base_uri,
852 const struct GNUNET_CRYPTO_EddsaPrivateKey *sign_key,
853 struct GNUNET_TIME_Absolute expiration_time)
855 struct GNUNET_FS_Uri *uri;
856 struct GNUNET_CRYPTO_EddsaPublicKey my_public_key;
857 struct LocUriAssembly ass;
858 struct GNUNET_TIME_Absolute et;
860 if (GNUNET_FS_URI_CHK != base_uri->type)
862 /* we round expiration time to full seconds for SKS URIs */
863 et.abs_value_us = (expiration_time.abs_value_us / 1000000LL) * 1000000LL;
864 GNUNET_CRYPTO_eddsa_key_get_public (sign_key,
866 ass.purpose.size = htonl (sizeof (struct LocUriAssembly));
867 ass.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT);
868 ass.exptime = GNUNET_TIME_absolute_hton (et);
869 ass.fi = base_uri->data.chk;
870 ass.peer.public_key = my_public_key;
871 uri = GNUNET_new (struct GNUNET_FS_Uri);
872 uri->type = GNUNET_FS_URI_LOC;
873 uri->data.loc.fi = base_uri->data.chk;
874 uri->data.loc.expirationTime = et;
875 uri->data.loc.peer.public_key = my_public_key;
876 GNUNET_assert (GNUNET_OK ==
877 GNUNET_CRYPTO_eddsa_sign (sign_key,
879 &uri->data.loc.contentSignature));
885 * Create an SKS URI from a namespace ID and an identifier.
887 * @param ns namespace ID
888 * @param id identifier
889 * @return an FS URI for the given namespace and identifier
891 struct GNUNET_FS_Uri *
892 GNUNET_FS_uri_sks_create (const struct GNUNET_CRYPTO_EcdsaPublicKey *ns,
895 struct GNUNET_FS_Uri *ns_uri;
897 ns_uri = GNUNET_new (struct GNUNET_FS_Uri);
898 ns_uri->type = GNUNET_FS_URI_SKS;
899 ns_uri->data.sks.ns = *ns;
900 ns_uri->data.sks.identifier = GNUNET_strdup (id);
906 * Merge the sets of keywords from two KSK URIs.
907 * (useful for merging the canonicalized keywords with
908 * the original keywords for sharing).
910 * @param u1 first uri
911 * @param u2 second uri
912 * @return merged URI, NULL on error
914 struct GNUNET_FS_Uri *
915 GNUNET_FS_uri_ksk_merge (const struct GNUNET_FS_Uri *u1,
916 const struct GNUNET_FS_Uri *u2)
918 struct GNUNET_FS_Uri *ret;
926 if ((u1 == NULL) && (u2 == NULL))
929 return GNUNET_FS_uri_dup (u2);
931 return GNUNET_FS_uri_dup (u1);
932 if ((u1->type != GNUNET_FS_URI_KSK) || (u2->type != GNUNET_FS_URI_KSK))
937 kc = u1->data.ksk.keywordCount;
938 kl = GNUNET_malloc ((kc + u2->data.ksk.keywordCount) * sizeof (char *));
939 for (i = 0; i < u1->data.ksk.keywordCount; i++)
940 kl[i] = GNUNET_strdup (u1->data.ksk.keywords[i]);
941 for (i = 0; i < u2->data.ksk.keywordCount; i++)
943 kp = u2->data.ksk.keywords[i];
945 for (j = 0; j < u1->data.ksk.keywordCount; j++)
946 if (0 == strcmp (kp + 1, kl[j] + 1))
954 kl[kc++] = GNUNET_strdup (kp);
956 ret = GNUNET_new (struct GNUNET_FS_Uri);
957 ret->type = GNUNET_FS_URI_KSK;
958 ret->data.ksk.keywordCount = kc;
959 ret->data.ksk.keywords = kl;
967 * @param uri the URI to duplicate
968 * @return copy of the URI
970 struct GNUNET_FS_Uri *
971 GNUNET_FS_uri_dup (const struct GNUNET_FS_Uri *uri)
973 struct GNUNET_FS_Uri *ret;
978 ret = GNUNET_new (struct GNUNET_FS_Uri);
979 memcpy (ret, uri, sizeof (struct GNUNET_FS_Uri));
982 case GNUNET_FS_URI_KSK:
983 if (ret->data.ksk.keywordCount >=
984 GNUNET_MAX_MALLOC_CHECKED / sizeof (char *))
990 if (ret->data.ksk.keywordCount > 0)
992 ret->data.ksk.keywords =
993 GNUNET_malloc (ret->data.ksk.keywordCount * sizeof (char *));
994 for (i = 0; i < ret->data.ksk.keywordCount; i++)
995 ret->data.ksk.keywords[i] = GNUNET_strdup (uri->data.ksk.keywords[i]);
998 ret->data.ksk.keywords = NULL; /* just to be sure */
1000 case GNUNET_FS_URI_SKS:
1001 ret->data.sks.identifier = GNUNET_strdup (uri->data.sks.identifier);
1003 case GNUNET_FS_URI_LOC:
1013 * Create an FS URI from a single user-supplied string of keywords.
1014 * The string is broken up at spaces into individual keywords.
1015 * Keywords that start with "+" are mandatory. Double-quotes can
1016 * be used to prevent breaking up strings at spaces (and also
1017 * to specify non-mandatory keywords starting with "+").
1019 * Keywords must contain a balanced number of double quotes and
1020 * double quotes can not be used in the actual keywords (for
1021 * example, the string '""foo bar""' will be turned into two
1022 * "OR"ed keywords 'foo' and 'bar', not into '"foo bar"'.
1024 * @param keywords the keyword string
1025 * @param emsg where to store an error message
1026 * @return an FS URI for the given keywords, NULL
1027 * if keywords is not legal (i.e. empty).
1029 struct GNUNET_FS_Uri *
1030 GNUNET_FS_uri_ksk_create (const char *keywords,
1034 unsigned int num_Words;
1037 struct GNUNET_FS_Uri *uri;
1041 if (keywords == NULL)
1043 *emsg = GNUNET_strdup (_("No keywords specified!\n"));
1047 searchString = GNUNET_strdup (keywords);
1052 while ('\0' != *pos)
1054 if ((saw_quote == 0) && (isspace ((unsigned char) *pos)))
1058 else if (0 == inWord)
1064 saw_quote = (saw_quote + 1) % 2;
1069 GNUNET_free (searchString);
1070 *emsg = GNUNET_strdup (_("No keywords specified!\n"));
1075 GNUNET_free (searchString);
1076 *emsg = GNUNET_strdup (_("Number of double-quotes not balanced!\n"));
1079 keywordarr = GNUNET_malloc (num_Words * sizeof (char *));
1083 while ('\0' != *pos)
1085 if ((saw_quote == 0) && (isspace ((unsigned char) *pos)))
1090 else if (0 == inWord)
1092 keywordarr[num_Words] = pos;
1097 saw_quote = (saw_quote + 1) % 2;
1101 GNUNET_FS_uri_ksk_create_from_args (num_Words,
1102 (const char **) keywordarr);
1103 GNUNET_free (keywordarr);
1104 GNUNET_free (searchString);
1110 * Create an FS URI from a user-supplied command line of keywords.
1111 * Arguments should start with "+" to indicate mandatory
1114 * @param argc number of keywords
1115 * @param argv keywords (double quotes are not required for
1116 * keywords containing spaces; however, double
1117 * quotes are required for keywords starting with
1118 * "+"); there is no mechanism for having double
1119 * quotes in the actual keywords (if the user
1120 * did specifically specify double quotes, the
1121 * caller should convert each double quote
1122 * into two single quotes).
1123 * @return an FS URI for the given keywords, NULL
1124 * if keywords is not legal (i.e. empty).
1126 struct GNUNET_FS_Uri *
1127 GNUNET_FS_uri_ksk_create_from_args (unsigned int argc,
1131 struct GNUNET_FS_Uri *uri;
1132 const char *keyword;
1140 /* allow URI to be given as one and only keyword and
1141 * handle accordingly */
1143 if ((argc == 1) && (strlen (argv[0]) > strlen (GNUNET_FS_URI_PREFIX)) &&
1145 strncmp (argv[0], GNUNET_FS_URI_PREFIX, strlen (GNUNET_FS_URI_PREFIX)))
1146 && (NULL != (uri = GNUNET_FS_uri_parse (argv[0], &emsg))))
1148 GNUNET_free_non_null (emsg);
1149 uri = GNUNET_new (struct GNUNET_FS_Uri);
1150 uri->type = GNUNET_FS_URI_KSK;
1151 uri->data.ksk.keywordCount = argc;
1152 uri->data.ksk.keywords = GNUNET_malloc (argc * sizeof (char *));
1153 for (i = 0; i < argc; i++)
1156 if (keyword[0] == '+')
1157 val = GNUNET_strdup (keyword);
1159 GNUNET_asprintf (&val, " %s", keyword);
1170 uri->data.ksk.keywords[i] = val;
1177 * Test if two URIs are equal.
1179 * @param u1 one of the URIs
1180 * @param u2 the other URI
1181 * @return #GNUNET_YES if the URIs are equal
1184 GNUNET_FS_uri_test_equal (const struct GNUNET_FS_Uri *u1,
1185 const struct GNUNET_FS_Uri *u2)
1191 GNUNET_assert (u1 != NULL);
1192 GNUNET_assert (u2 != NULL);
1193 if (u1->type != u2->type)
1197 case GNUNET_FS_URI_CHK:
1199 memcmp (&u1->data.chk, &u2->data.chk, sizeof (struct FileIdentifier)))
1202 case GNUNET_FS_URI_SKS:
1204 memcmp (&u1->data.sks.ns, &u2->data.sks.ns,
1205 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey))) &&
1206 (0 == strcmp (u1->data.sks.identifier, u2->data.sks.identifier)))
1210 case GNUNET_FS_URI_KSK:
1211 if (u1->data.ksk.keywordCount != u2->data.ksk.keywordCount)
1213 for (i = 0; i < u1->data.ksk.keywordCount; i++)
1216 for (j = 0; j < u2->data.ksk.keywordCount; j++)
1218 if (0 == strcmp (u1->data.ksk.keywords[i], u2->data.ksk.keywords[j]))
1224 if (ret == GNUNET_NO)
1228 case GNUNET_FS_URI_LOC:
1230 (&u1->data.loc, &u2->data.loc,
1231 sizeof (struct FileIdentifier) +
1232 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey) +
1233 sizeof (struct GNUNET_TIME_Absolute) + sizeof (unsigned short) +
1234 sizeof (unsigned short)) != 0)
1244 * Is this a namespace URI?
1246 * @param uri the uri to check
1247 * @return #GNUNET_YES if this is an SKS uri
1250 GNUNET_FS_uri_test_sks (const struct GNUNET_FS_Uri *uri)
1252 return uri->type == GNUNET_FS_URI_SKS;
1257 * Get the ID of a namespace from the given
1260 * @param uri the uri to get the namespace ID from
1261 * @param pseudonym where to store the ID of the namespace
1262 * @return #GNUNET_OK on success
1265 GNUNET_FS_uri_sks_get_namespace (const struct GNUNET_FS_Uri *uri,
1266 struct GNUNET_CRYPTO_EcdsaPublicKey *pseudonym)
1268 if (!GNUNET_FS_uri_test_sks (uri))
1271 return GNUNET_SYSERR;
1273 *pseudonym = uri->data.sks.ns;
1279 * Get the content identifier of an SKS URI.
1281 * @param uri the sks uri
1282 * @return NULL on error (not a valid SKS URI)
1285 GNUNET_FS_uri_sks_get_content_id (const struct GNUNET_FS_Uri *uri)
1287 if (!GNUNET_FS_uri_test_sks (uri))
1292 return GNUNET_strdup (uri->data.sks.identifier);
1297 * Is this a keyword URI?
1299 * @param uri the uri
1300 * @return #GNUNET_YES if this is a KSK uri
1303 GNUNET_FS_uri_test_ksk (const struct GNUNET_FS_Uri *uri)
1308 if (uri->type == GNUNET_FS_URI_KSK)
1310 for (i=0;i < uri->data.ksk.keywordCount; i++)
1311 GNUNET_assert (uri->data.ksk.keywords[i] != NULL);
1314 return uri->type == GNUNET_FS_URI_KSK;
1319 * Is this a file (or directory) URI?
1321 * @param uri the uri to check
1322 * @return #GNUNET_YES if this is a CHK uri
1325 GNUNET_FS_uri_test_chk (const struct GNUNET_FS_Uri *uri)
1327 return uri->type == GNUNET_FS_URI_CHK;
1332 * What is the size of the file that this URI
1335 * @param uri the CHK URI to inspect
1336 * @return size of the file as specified in the CHK URI
1339 GNUNET_FS_uri_chk_get_file_size (const struct GNUNET_FS_Uri * uri)
1343 case GNUNET_FS_URI_CHK:
1344 return GNUNET_ntohll (uri->data.chk.file_length);
1345 case GNUNET_FS_URI_LOC:
1346 return GNUNET_ntohll (uri->data.loc.fi.file_length);
1350 return 0; /* unreachable */
1355 * Is this a location URI?
1357 * @param uri the uri to check
1358 * @return #GNUNET_YES if this is a LOC uri
1361 GNUNET_FS_uri_test_loc (const struct GNUNET_FS_Uri *uri)
1363 return uri->type == GNUNET_FS_URI_LOC;
1368 * Add a keyword as non-mandatory (with ' '-prefix) to the
1369 * given keyword list at offset 'index'. The array is
1370 * guaranteed to be long enough.
1372 * @param s keyword to add
1373 * @param array array to add the keyword to
1374 * @param index offset where to add the keyword
1377 insert_non_mandatory_keyword (const char *s,
1383 GNUNET_asprintf (&nkword,
1384 " %s", /* space to mark as 'non mandatory' */
1386 array[index] = nkword;
1391 * Test if the given keyword @a s is already present in the
1392 * given array, ignoring the '+'-mandatory prefix in the array.
1394 * @param s keyword to test
1395 * @param array keywords to test against, with ' ' or '+' prefix to ignore
1396 * @param array_length length of the @a array
1397 * @return #GNUNET_YES if the keyword exists, #GNUNET_NO if not
1400 find_duplicate (const char *s,
1406 for (j = array_length - 1; j >= 0; j--)
1407 if (0 == strcmp (&array[j][1], s))
1417 normalize_metadata (enum EXTRACTOR_MetaFormat format,
1421 uint8_t *free_str = NULL;
1422 uint8_t *str_to_normalize = (uint8_t *) data;
1423 uint8_t *normalized;
1425 if (str_to_normalize == NULL)
1427 /* Don't trust libextractor */
1428 if (format == EXTRACTOR_METAFORMAT_UTF8)
1430 free_str = (uint8_t *) u8_check ((const uint8_t *) data, data_len);
1431 if (free_str == NULL)
1434 format = EXTRACTOR_METAFORMAT_C_STRING;
1436 if (format == EXTRACTOR_METAFORMAT_C_STRING)
1438 free_str = u8_strconv_from_encoding (data, locale_charset (), iconveh_escape_sequence);
1439 if (free_str == NULL)
1443 normalized = u8_tolower (str_to_normalize, strlen ((char *) str_to_normalize), NULL, UNINORM_NFD, NULL, &r_len);
1444 /* free_str is allocated by libunistring internally, use free() */
1445 if (free_str != NULL)
1447 if (normalized != NULL)
1449 /* u8_tolower allocates a non-NULL-terminated string! */
1450 free_str = GNUNET_malloc (r_len + 1);
1451 memcpy (free_str, normalized, r_len);
1452 free_str[r_len] = '\0';
1454 normalized = free_str;
1456 return (char *) normalized;
1461 * Counts the number of UTF-8 characters (not bytes) in the string,
1462 * returns that count.
1465 u8_strcount (const uint8_t *s)
1469 GNUNET_assert (s != NULL);
1472 for (count = 0; s != NULL; count++)
1473 s = u8_next (&c, s);
1479 * Break the filename up by matching [], () and {} pairs to make
1480 * keywords. In case of nesting parentheses only the inner pair counts.
1481 * You can't escape parentheses to scan something like "[blah\{foo]" to
1482 * make a "blah{foo" keyword, this function is only a heuristic!
1484 * @param s string to break down.
1485 * @param array array to fill with enclosed tokens. If NULL, then tokens
1487 * @param index index at which to start filling the array (entries prior
1488 * to it are used to check for duplicates). ignored if @a array == NULL.
1489 * @return number of tokens counted (including duplicates), or number of
1490 * tokens extracted (excluding duplicates). 0 if there are no
1491 * matching parens in the string (when counting), or when all tokens
1492 * were duplicates (when extracting).
1495 get_keywords_from_parens (const char *s,
1507 ss = GNUNET_strdup (s);
1508 open_paren = ss - 1;
1509 while (NULL != (open_paren = strpbrk (open_paren + 1, "[{(")))
1513 close_paren = strpbrk (open_paren + 1, "]})");
1514 if (NULL == close_paren)
1516 switch (open_paren[0])
1519 if (']' == close_paren[0])
1523 if ('}' == close_paren[0])
1527 if (')' == close_paren[0])
1533 if (match && (close_paren - open_paren > 1))
1535 tmp = close_paren[0];
1536 close_paren[0] = '\0';
1537 /* Keywords must be at least 3 characters long */
1538 if (u8_strcount ((const uint8_t *) &open_paren[1]) <= 2)
1540 close_paren[0] = tmp;
1546 if (GNUNET_NO == find_duplicate ((const char *) &open_paren[1],
1547 (const char **) array, index + count))
1549 insert_non_mandatory_keyword ((const char *) &open_paren[1], array,
1553 normalized = normalize_metadata (EXTRACTOR_METAFORMAT_UTF8,
1554 &open_paren[1], close_paren - &open_paren[1]);
1555 if (normalized != NULL)
1557 if (GNUNET_NO == find_duplicate ((const char *) normalized,
1558 (const char **) array, index + count))
1560 insert_non_mandatory_keyword ((const char *) normalized, array,
1564 GNUNET_free (normalized);
1569 close_paren[0] = tmp;
1578 * Where to break up keywords
1580 #define TOKENS "_. /-!?#&+@\"\'\\;:,()[]{}$<>|"
1583 * Break the filename up by TOKENS to make
1586 * @param s string to break down.
1587 * @param array array to fill with tokens. If NULL, then tokens are only
1589 * @param index index at which to start filling the array (entries prior
1590 * to it are used to check for duplicates). ignored if @a array == NULL.
1591 * @return number of tokens (>1) counted (including duplicates), or number of
1592 * tokens extracted (excluding duplicates). 0 if there are no
1593 * separators in the string (when counting), or when all tokens were
1594 * duplicates (when extracting).
1597 get_keywords_from_tokens (const char *s,
1605 ss = GNUNET_strdup (s);
1606 for (p = strtok (ss, TOKENS); p != NULL; p = strtok (NULL, TOKENS))
1608 /* Keywords must be at least 3 characters long */
1609 if (u8_strcount ((const uint8_t *) p) <= 2)
1614 if (GNUNET_NO == find_duplicate (p, (const char **) array, index + seps))
1616 insert_non_mandatory_keyword (p, array,
1620 normalized = normalize_metadata (EXTRACTOR_METAFORMAT_UTF8,
1622 if (normalized != NULL)
1624 if (GNUNET_NO == find_duplicate ((const char *) normalized,
1625 (const char **) array, index + seps))
1627 insert_non_mandatory_keyword ((const char *) normalized, array,
1631 GNUNET_free (normalized);
1644 * Function called on each value in the meta data.
1645 * Adds it to the URI.
1647 * @param cls URI to update
1648 * @param plugin_name name of the plugin that produced this value;
1649 * special values can be used (i.e. '<zlib>' for zlib being
1650 * used in the main libextractor library and yielding
1652 * @param type libextractor-type describing the meta data
1653 * @param format basic format information about data
1654 * @param data_mime_type mime-type of data (not of the original file);
1655 * can be NULL (if mime-type is not known)
1656 * @param data actual meta-data found
1657 * @param data_len number of bytes in @a data
1658 * @return 0 (always)
1661 gather_uri_data (void *cls, const char *plugin_name,
1662 enum EXTRACTOR_MetaType type,
1663 enum EXTRACTOR_MetaFormat format,
1664 const char *data_mime_type,
1668 struct GNUNET_FS_Uri *uri = cls;
1669 char *normalized_data;
1672 if ((format != EXTRACTOR_METAFORMAT_UTF8) &&
1673 (format != EXTRACTOR_METAFORMAT_C_STRING))
1675 /* Keywords must be at least 3 characters long
1676 * If given non-utf8 string it will, most likely, find it to be invalid,
1677 * and will return the length of its valid part, skipping the keyword.
1678 * If it does - fix the extractor, not this check!
1680 if (u8_strcount ((const uint8_t *) data) <= 2)
1682 if ( (EXTRACTOR_METATYPE_MIMETYPE == type) &&
1683 (NULL != (sep = memchr (data, '/', data_len))) &&
1688 GNUNET_asprintf (&xtra,
1692 if (! find_duplicate (xtra,
1693 (const char **) uri->data.ksk.keywords,
1694 uri->data.ksk.keywordCount))
1696 insert_non_mandatory_keyword (xtra,
1697 uri->data.ksk.keywords,
1698 uri->data.ksk.keywordCount);
1699 uri->data.ksk.keywordCount++;
1704 normalized_data = normalize_metadata (format, data, data_len);
1705 if (! find_duplicate (data,
1706 (const char **) uri->data.ksk.keywords,
1707 uri->data.ksk.keywordCount))
1709 insert_non_mandatory_keyword (data,
1710 uri->data.ksk.keywords, uri->data.ksk.keywordCount);
1711 uri->data.ksk.keywordCount++;
1713 if (NULL != normalized_data)
1715 if (! find_duplicate (normalized_data,
1716 (const char **) uri->data.ksk.keywords,
1717 uri->data.ksk.keywordCount))
1719 insert_non_mandatory_keyword (normalized_data,
1720 uri->data.ksk.keywords, uri->data.ksk.keywordCount);
1721 uri->data.ksk.keywordCount++;
1723 GNUNET_free (normalized_data);
1730 * Construct a keyword-URI from meta-data (take all entries
1731 * in the meta-data and construct one large keyword URI
1732 * that lists all keywords that can be found in the meta-data).
1734 * @param md metadata to use
1735 * @return NULL on error, otherwise a KSK URI
1737 struct GNUNET_FS_Uri *
1738 GNUNET_FS_uri_ksk_create_from_meta_data (const struct GNUNET_CONTAINER_MetaData *md)
1740 struct GNUNET_FS_Uri *ret;
1742 char *full_name = NULL;
1745 int tok_keywords = 0;
1746 int paren_keywords = 0;
1750 ret = GNUNET_new (struct GNUNET_FS_Uri);
1751 ret->type = GNUNET_FS_URI_KSK;
1752 ent = GNUNET_CONTAINER_meta_data_iterate (md, NULL, NULL);
1755 full_name = GNUNET_CONTAINER_meta_data_get_first_by_types (md,
1756 EXTRACTOR_METATYPE_GNUNET_ORIGINAL_FILENAME, -1);
1757 if (NULL != full_name)
1759 filename = full_name;
1760 while (NULL != (ss = strstr (filename, DIR_SEPARATOR_STR)))
1762 tok_keywords = get_keywords_from_tokens (filename, NULL, 0);
1763 paren_keywords = get_keywords_from_parens (filename, NULL, 0);
1765 /* x3 because there might be a normalized variant of every keyword,
1766 plus theoretically one more for mime... */
1767 ret->data.ksk.keywords = GNUNET_malloc
1768 (sizeof (char *) * (ent + tok_keywords + paren_keywords) * 3);
1769 GNUNET_CONTAINER_meta_data_iterate (md, &gather_uri_data, ret);
1771 if (tok_keywords > 0)
1772 ret->data.ksk.keywordCount += get_keywords_from_tokens (filename,
1773 ret->data.ksk.keywords,
1774 ret->data.ksk.keywordCount);
1775 if (paren_keywords > 0)
1776 ret->data.ksk.keywordCount += get_keywords_from_parens (filename,
1777 ret->data.ksk.keywords,
1778 ret->data.ksk.keywordCount);
1780 GNUNET_free_non_null (full_name);
1786 * In URI-encoding, does the given character
1787 * need to be encoded using %-encoding?
1790 needs_percent (char c)
1793 ((isalnum ((unsigned char) c)) || (c == '-') || (c == '_') ||
1794 (c == '.') || (c == '~')));
1799 * Convert a KSK URI to a string.
1801 * @param uri the URI to convert
1802 * @return NULL on error (i.e. keywordCount == 0)
1805 uri_ksk_to_string (const struct GNUNET_FS_Uri *uri)
1808 unsigned int keywordCount;
1815 const char *keyword;
1817 if (uri->type != GNUNET_FS_URI_KSK)
1819 keywords = uri->data.ksk.keywords;
1820 keywordCount = uri->data.ksk.keywordCount;
1821 n = keywordCount + strlen (GNUNET_FS_URI_PREFIX) +
1822 strlen (GNUNET_FS_URI_KSK_INFIX) + 1;
1823 for (i = 0; i < keywordCount; i++)
1825 keyword = keywords[i];
1826 slen = strlen (keyword);
1828 for (j = 0; j < slen; j++)
1830 if ((j == 0) && (keyword[j] == ' '))
1833 continue; /* skip leading space */
1835 if (needs_percent (keyword[j]))
1836 n += 2; /* will use %-encoding */
1839 ret = GNUNET_malloc (n);
1840 strcpy (ret, GNUNET_FS_URI_PREFIX);
1841 strcat (ret, GNUNET_FS_URI_KSK_INFIX);
1842 wpos = strlen (ret);
1843 for (i = 0; i < keywordCount; i++)
1845 keyword = keywords[i];
1846 slen = strlen (keyword);
1847 for (j = 0; j < slen; j++)
1849 if ((j == 0) && (keyword[j] == ' '))
1850 continue; /* skip leading space */
1851 if (needs_percent (keyword[j]))
1853 sprintf (&ret[wpos], "%%%02X", (unsigned char) keyword[j]);
1858 ret[wpos++] = keyword[j];
1861 if (i != keywordCount - 1)
1869 * Convert SKS URI to a string.
1871 * @param uri sks uri to convert
1872 * @return NULL on error
1875 uri_sks_to_string (const struct GNUNET_FS_Uri *uri)
1880 if (GNUNET_FS_URI_SKS != uri->type)
1882 ret = GNUNET_STRINGS_data_to_string (&uri->data.sks.ns,
1883 sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey),
1886 GNUNET_assert (NULL != ret);
1888 GNUNET_asprintf (&ret, "%s%s%s/%s", GNUNET_FS_URI_PREFIX,
1889 GNUNET_FS_URI_SKS_INFIX, buf,
1890 uri->data.sks.identifier);
1896 * Convert a CHK URI to a string.
1898 * @param uri chk uri to convert
1899 * @return NULL on error
1902 uri_chk_to_string (const struct GNUNET_FS_Uri *uri)
1904 const struct FileIdentifier *fi;
1906 struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1907 struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1909 if (uri->type != GNUNET_FS_URI_CHK)
1911 fi = &uri->data.chk;
1912 GNUNET_CRYPTO_hash_to_enc (&fi->chk.key, &keyhash);
1913 GNUNET_CRYPTO_hash_to_enc (&fi->chk.query, &queryhash);
1915 GNUNET_asprintf (&ret, "%s%s%s.%s.%llu", GNUNET_FS_URI_PREFIX,
1916 GNUNET_FS_URI_CHK_INFIX, (const char *) &keyhash,
1917 (const char *) &queryhash, GNUNET_ntohll (fi->file_length));
1923 * Convert a LOC URI to a string.
1925 * @param uri loc uri to convert
1926 * @return NULL on error
1929 uri_loc_to_string (const struct GNUNET_FS_Uri *uri)
1932 struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1933 struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1935 char peer_sig[SIGNATURE_ASCII_LENGTH + 1];
1937 GNUNET_CRYPTO_hash_to_enc (&uri->data.loc.fi.chk.key, &keyhash);
1938 GNUNET_CRYPTO_hash_to_enc (&uri->data.loc.fi.chk.query, &queryhash);
1940 GNUNET_CRYPTO_eddsa_public_key_to_string (&uri->data.loc.peer.public_key);
1941 GNUNET_assert (NULL !=
1942 GNUNET_STRINGS_data_to_string (&uri->data.loc.contentSignature,
1943 sizeof (struct GNUNET_CRYPTO_EddsaSignature),
1945 sizeof (peer_sig)));
1946 GNUNET_asprintf (&ret,
1947 "%s%s%s.%s.%llu.%s.%s.%llu", GNUNET_FS_URI_PREFIX,
1948 GNUNET_FS_URI_LOC_INFIX, (const char *) &keyhash,
1949 (const char *) &queryhash,
1950 (unsigned long long) GNUNET_ntohll (uri->data.loc.
1954 (unsigned long long) uri->data.loc.expirationTime.abs_value_us / 1000000LL);
1955 GNUNET_free (peer_id);
1961 * Convert a URI to a UTF-8 String.
1963 * @param uri uri to convert to a string
1964 * @return the UTF-8 string
1967 GNUNET_FS_uri_to_string (const struct GNUNET_FS_Uri *uri)
1976 case GNUNET_FS_URI_KSK:
1977 return uri_ksk_to_string (uri);
1978 case GNUNET_FS_URI_SKS:
1979 return uri_sks_to_string (uri);
1980 case GNUNET_FS_URI_CHK:
1981 return uri_chk_to_string (uri);
1982 case GNUNET_FS_URI_LOC:
1983 return uri_loc_to_string (uri);
1990 /* end of fs_uri.c */