GNUnet 0.21.1
fs_uri.c File Reference

Parses and produces uri strings. More...

#include "platform.h"
#include "gnunet_fs_service.h"
#include "gnunet_signatures.h"
#include "fs_api.h"
#include <unitypes.h>
#include <unicase.h>
#include <uniconv.h>
#include <unistr.h>
#include <unistdio.h>
Include dependency graph for fs_uri.c:

Go to the source code of this file.

Data Structures

struct  LocUriAssembly
 Structure that defines how the contents of a location URI must be assembled in memory to create or verify the signature of a location URI. More...
 

Macros

#define GNUNET_FS_URI_KSK_PREFIX   GNUNET_FS_URI_PREFIX GNUNET_FS_URI_KSK_INFIX
 
#define GNUNET_FS_URI_SKS_PREFIX   GNUNET_FS_URI_PREFIX GNUNET_FS_URI_SKS_INFIX
 
#define GNUNET_FS_URI_CHK_PREFIX   GNUNET_FS_URI_PREFIX GNUNET_FS_URI_CHK_INFIX
 
#define GNUNET_FS_URI_LOC_PREFIX   GNUNET_FS_URI_PREFIX GNUNET_FS_URI_LOC_INFIX
 
#define SIGNATURE_ASCII_LENGTH   103
 
#define TOKENS   "_. /-!?#&+@\"\'\\;:,()[]{}$<>|"
 Where to break up keywords. More...
 

Functions

int GNUNET_FS_uri_to_key (const struct GNUNET_FS_Uri *uri, struct GNUNET_HashCode *key)
 Get a unique key from a URI. More...
 
char * GNUNET_FS_uri_ksk_to_string_fancy (const struct GNUNET_FS_Uri *uri)
 Convert keyword URI to a human readable format (i.e. More...
 
static char * percent_decode_keyword (const char *in, char **emsg)
 Given a keyword with %-encoding (and possibly quotes to protect spaces), return a copy of the keyword without %-encoding and without double-quotes (%22). More...
 
static struct GNUNET_FS_Uriuri_ksk_parse (const char *s, char **emsg)
 Parse a KSK URI. More...
 
static struct GNUNET_FS_Uriuri_sks_parse (const char *s, char **emsg)
 Parse an SKS URI. More...
 
static struct GNUNET_FS_Uriuri_chk_parse (const char *s, char **emsg)
 Parse a CHK URI. More...
 
static struct GNUNET_FS_Uriuri_loc_parse (const char *s, char **emsg)
 Parse a LOC URI. More...
 
struct GNUNET_FS_UriGNUNET_FS_uri_parse (const char *uri, char **emsg)
 Convert a UTF-8 String to a URI. More...
 
void GNUNET_FS_uri_destroy (struct GNUNET_FS_Uri *uri)
 Free URI. More...
 
unsigned int GNUNET_FS_uri_ksk_get_keyword_count (const struct GNUNET_FS_Uri *uri)
 How many keywords are ANDed in this keyword URI? More...
 
int GNUNET_FS_uri_ksk_get_keywords (const struct GNUNET_FS_Uri *uri, GNUNET_FS_KeywordIterator iterator, void *iterator_cls)
 Iterate over all keywords in this keyword URI. More...
 
void GNUNET_FS_uri_ksk_add_keyword (struct GNUNET_FS_Uri *uri, const char *keyword, int is_mandatory)
 Add the given keyword to the set of keywords represented by the URI. More...
 
void GNUNET_FS_uri_ksk_remove_keyword (struct GNUNET_FS_Uri *uri, const char *keyword)
 Remove the given keyword from the set of keywords represented by the URI. More...
 
int GNUNET_FS_uri_loc_get_peer_identity (const struct GNUNET_FS_Uri *uri, struct GNUNET_PeerIdentity *peer)
 Obtain the identity of the peer offering the data. More...
 
struct GNUNET_TIME_Absolute GNUNET_FS_uri_loc_get_expiration (const struct GNUNET_FS_Uri *uri)
 Obtain the expiration of the LOC URI. More...
 
struct GNUNET_FS_UriGNUNET_FS_uri_loc_get_uri (const struct GNUNET_FS_Uri *uri)
 Obtain the URI of the content itself. More...
 
struct GNUNET_FS_UriGNUNET_FS_uri_loc_create (const struct GNUNET_FS_Uri *base_uri, const struct GNUNET_CRYPTO_EddsaPrivateKey *sign_key, struct GNUNET_TIME_Absolute expiration_time)
 Construct a location URI (this peer will be used for the location). More...
 
struct GNUNET_FS_UriGNUNET_FS_uri_sks_create (const struct GNUNET_CRYPTO_EcdsaPublicKey *ns, const char *id)
 Create an SKS URI from a namespace ID and an identifier. More...
 
struct GNUNET_FS_UriGNUNET_FS_uri_ksk_merge (const struct GNUNET_FS_Uri *u1, const struct GNUNET_FS_Uri *u2)
 Merge the sets of keywords from two KSK URIs. More...
 
struct GNUNET_FS_UriGNUNET_FS_uri_dup (const struct GNUNET_FS_Uri *uri)
 Duplicate URI. More...
 
struct GNUNET_FS_UriGNUNET_FS_uri_ksk_create (const char *keywords, char **emsg)
 Create an FS URI from a single user-supplied string of keywords. More...
 
struct GNUNET_FS_UriGNUNET_FS_uri_ksk_create_from_args (unsigned int argc, const char **argv)
 Create an FS URI from a user-supplied command line of keywords. More...
 
int GNUNET_FS_uri_test_equal (const struct GNUNET_FS_Uri *u1, const struct GNUNET_FS_Uri *u2)
 Test if two URIs are equal. More...
 
int GNUNET_FS_uri_test_sks (const struct GNUNET_FS_Uri *uri)
 Is this a namespace URI? More...
 
int GNUNET_FS_uri_sks_get_namespace (const struct GNUNET_FS_Uri *uri, struct GNUNET_CRYPTO_EcdsaPublicKey *pseudonym)
 Get the ID of a namespace from the given namespace URI. More...
 
char * GNUNET_FS_uri_sks_get_content_id (const struct GNUNET_FS_Uri *uri)
 Get the content identifier of an SKS URI. More...
 
int GNUNET_FS_uri_test_ksk (const struct GNUNET_FS_Uri *uri)
 Is this a keyword URI? More...
 
int GNUNET_FS_uri_test_chk (const struct GNUNET_FS_Uri *uri)
 Is this a file (or directory) URI? More...
 
uint64_t GNUNET_FS_uri_chk_get_file_size (const struct GNUNET_FS_Uri *uri)
 What is the size of the file that this URI refers to? More...
 
int GNUNET_FS_uri_test_loc (const struct GNUNET_FS_Uri *uri)
 Is this a location URI? More...
 
static void insert_non_mandatory_keyword (const char *s, char **array, int index)
 Add a keyword as non-mandatory (with ' '-prefix) to the given keyword list at offset 'index'. More...
 
static int find_duplicate (const char *s, const char **array, int array_length)
 Test if the given keyword s is already present in the given array, ignoring the '+'-mandatory prefix in the array. More...
 
static char * normalize_metadata (enum EXTRACTOR_MetaFormat format, const char *data, size_t data_len)
 FIXME: comment. More...
 
static size_t u8_strcount (const uint8_t *s)
 Counts the number of UTF-8 characters (not bytes) in the string, returns that count. More...
 
static int get_keywords_from_parens (const char *s, char **array, int index)
 Break the filename up by matching [], () and {} pairs to make keywords. More...
 
static int get_keywords_from_tokens (const char *s, char **array, int index)
 Break the filename up by TOKENS to make keywords. More...
 
static int gather_uri_data (void *cls, const char *plugin_name, enum EXTRACTOR_MetaType type, enum EXTRACTOR_MetaFormat format, const char *data_mime_type, const char *data, size_t data_len)
 Function called on each value in the meta data. More...
 
struct GNUNET_FS_UriGNUNET_FS_uri_ksk_create_from_meta_data (const struct GNUNET_FS_MetaData *md)
 Construct a keyword-URI from meta-data (take all entries in the meta-data and construct one large keyword URI that lists all keywords that can be found in the meta-data). More...
 
static int needs_percent (char c)
 In URI-encoding, does the given character need to be encoded using %-encoding? More...
 
static char * uri_ksk_to_string (const struct GNUNET_FS_Uri *uri)
 Convert a KSK URI to a string. More...
 
static char * uri_sks_to_string (const struct GNUNET_FS_Uri *uri)
 Convert SKS URI to a string. More...
 
static char * uri_chk_to_string (const struct GNUNET_FS_Uri *uri)
 Convert a CHK URI to a string. More...
 
static char * uri_loc_to_string (const struct GNUNET_FS_Uri *uri)
 Convert a LOC URI to a string. More...
 
char * GNUNET_FS_uri_to_string (const struct GNUNET_FS_Uri *uri)
 Convert a URI to a UTF-8 String. More...
 

Detailed Description

Parses and produces uri strings.

Author
Igor Wronsky, Christian Grothoff

GNUnet URIs are of the general form "gnunet://MODULE/IDENTIFIER". The specific structure of "IDENTIFIER" depends on the module and maybe differentiated into additional subcategories if applicable. This module only deals with fs identifiers (MODULE = "fs").

This module only parses URIs for the AFS module. The FS URIs fall into four categories, "chk", "sks", "ksk" and "loc". The first three categories were named in analogy (!) to Freenet, but they do NOT work in exactly the same way. They are very similar from the user's point of view (unique file identifier, subspace, keyword), but the implementation is rather different in pretty much every detail. The concrete URI formats are:

  • First, there are URIs that identify a file. They have the format "gnunet://fs/chk/HEX1.HEX2.SIZE". These URIs can be used to download the file. The description, filename, mime-type and other meta-data is NOT part of the file-URI since a URI uniquely identifies a resource (and the contents of the file would be the same even if it had a different description).

  • The second category identifies entries in a namespace. The format is "gnunet://fs/sks/NAMESPACE/IDENTIFIER" where the namespace should be given in HEX. Applications may allow using a nickname for the namespace if the nickname is not ambiguous. The identifier can be either an ASCII sequence or a HEX-encoding. If the identifier is in ASCII but the format is ambiguous and could denote a HEX-string a "/" is appended to indicate ASCII encoding.

  • The third category identifies ordinary searches. The format is "gnunet://fs/ksk/KEYWORD[+KEYWORD]*". Using the "+" syntax it is possible to encode searches with the boolean "AND" operator. "+" is used since it indicates a commutative 'and' operation and is unlikely to be used in a keyword by itself.

  • The last category identifies a datum on a specific machine. The format is "gnunet://fs/loc/HEX1.HEX2.SIZE.PEER.SIG.EXPTIME". PEER is the BinName of the public key of the peer storing the datum. The signature (SIG) certifies that this peer has this content. HEX1, HEX2 and SIZE correspond to a 'chk' URI.

The encoding for hexadecimal values is defined in the hashing.c module in the gnunetutil library and discussed there.

Definition in file fs_uri.c.

Macro Definition Documentation

◆ GNUNET_FS_URI_KSK_PREFIX

#define GNUNET_FS_URI_KSK_PREFIX   GNUNET_FS_URI_PREFIX GNUNET_FS_URI_KSK_INFIX

Definition at line 262 of file fs_uri.c.

◆ GNUNET_FS_URI_SKS_PREFIX

#define GNUNET_FS_URI_SKS_PREFIX   GNUNET_FS_URI_PREFIX GNUNET_FS_URI_SKS_INFIX

Definition at line 356 of file fs_uri.c.

◆ GNUNET_FS_URI_CHK_PREFIX

#define GNUNET_FS_URI_CHK_PREFIX   GNUNET_FS_URI_PREFIX GNUNET_FS_URI_CHK_INFIX

Definition at line 395 of file fs_uri.c.

◆ GNUNET_FS_URI_LOC_PREFIX

#define GNUNET_FS_URI_LOC_PREFIX   GNUNET_FS_URI_PREFIX GNUNET_FS_URI_LOC_INFIX

Definition at line 483 of file fs_uri.c.

◆ SIGNATURE_ASCII_LENGTH

#define SIGNATURE_ASCII_LENGTH   103

Definition at line 485 of file fs_uri.c.

◆ TOKENS

#define TOKENS   "_. /-!?#&+@\"\'\\;:,()[]{}$<>|"

Where to break up keywords.

Definition at line 1614 of file fs_uri.c.

Function Documentation

◆ percent_decode_keyword()

static char * percent_decode_keyword ( const char *  in,
char **  emsg 
)
static

Given a keyword with %-encoding (and possibly quotes to protect spaces), return a copy of the keyword without %-encoding and without double-quotes (%22).

Also, add a space at the beginning if there is not a '+'.

Parameters
instring with %-encoding
emsgwhere to store the parser error message (if any)
Returns
decoded string with leading space (or preserved plus)

Definition at line 212 of file fs_uri.c.

213{
214 char *out;
215 char *ret;
216 unsigned int rpos;
217 unsigned int wpos;
218 unsigned int hx;
219
220 out = GNUNET_strdup (in);
221 rpos = 0;
222 wpos = 0;
223 while (out[rpos] != '\0')
224 {
225 if (out[rpos] == '%')
226 {
227 if (1 != sscanf (&out[rpos + 1], "%2X", &hx))
228 {
229 GNUNET_free (out);
230 *emsg = GNUNET_strdup (
231 _ ( /* xgettext:no-c-format */
232 "Malformed KSK URI (`%' must be followed by HEX number)"));
233 return NULL;
234 }
235 rpos += 3;
236 if (hx == '"')
237 continue; /* skip double quote */
238 out[wpos++] = (char) hx;
239 }
240 else
241 {
242 out[wpos++] = out[rpos++];
243 }
244 }
245 out[wpos] = '\0';
246 if (out[0] == '+')
247 {
248 ret = GNUNET_strdup (out);
249 }
250 else
251 {
252 /* need to prefix with space */
253 ret = GNUNET_malloc (strlen (out) + 2);
254 strcpy (ret, " ");
255 strcat (ret, out);
256 }
257 GNUNET_free (out);
258 return ret;
259}
static int ret
Final status code.
Definition: gnunet-arm.c:94
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_free(ptr)
Wrapper around free.
#define _(String)
GNU gettext support macro.
Definition: platform.h:178

References _, GNUNET_free, GNUNET_malloc, GNUNET_strdup, and ret.

Referenced by uri_ksk_parse().

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◆ uri_ksk_parse()

static struct GNUNET_FS_Uri * uri_ksk_parse ( const char *  s,
char **  emsg 
)
static

Parse a KSK URI.

Parameters
san uri string
emsgwhere to store the parser error message (if any)
Returns
NULL on error, otherwise the KSK URI

Definition at line 272 of file fs_uri.c.

273{
274 struct GNUNET_FS_Uri *ret;
275 char **keywords;
276 unsigned int pos;
277 int max;
278 int iret;
279 int i;
280 size_t slen;
281 char *dup;
282 int saw_quote;
283
284 slen = strlen (s);
285 pos = strlen (GNUNET_FS_URI_KSK_PREFIX);
286 if ((slen <= pos) || (0 != strncmp (s, GNUNET_FS_URI_KSK_PREFIX, pos)))
287 return NULL; /* not KSK URI */
288 if ((s[slen - 1] == '+') || (s[pos] == '+'))
289 {
290 *emsg =
291 GNUNET_strdup (_ ("Malformed KSK URI (must not begin or end with `+')"));
292 return NULL;
293 }
294 max = 1;
295 saw_quote = 0;
296 for (i = pos; i < slen; i++)
297 {
298 if ((s[i] == '%') && (&s[i] == strstr (&s[i], "%22")))
299 {
300 saw_quote = (saw_quote + 1) % 2;
301 i += 3;
302 continue;
303 }
304 if ((s[i] == '+') && (saw_quote == 0))
305 {
306 max++;
307 if (s[i - 1] == '+')
308 {
309 *emsg = GNUNET_strdup (_ ("Malformed KSK URI (`++' not allowed)"));
310 return NULL;
311 }
312 }
313 }
314 if (saw_quote == 1)
315 {
316 *emsg = GNUNET_strdup (_ ("Malformed KSK URI (quotes not balanced)"));
317 return NULL;
318 }
319 iret = max;
320 dup = GNUNET_strdup (s);
321 keywords = GNUNET_new_array (max, char *);
322 for (i = slen - 1; i >= (int) pos; i--)
323 {
324 if ((s[i] == '%') && (&s[i] == strstr (&s[i], "%22")))
325 {
326 saw_quote = (saw_quote + 1) % 2;
327 continue;
328 }
329 if ((dup[i] == '+') && (saw_quote == 0))
330 {
331 keywords[--max] = percent_decode_keyword (&dup[i + 1], emsg);
332 if (NULL == keywords[max])
333 goto CLEANUP;
334 dup[i] = '\0';
335 }
336 }
337 keywords[--max] = percent_decode_keyword (&dup[pos], emsg);
338 if (NULL == keywords[max])
339 goto CLEANUP;
340 GNUNET_assert (0 == max);
341 GNUNET_free (dup);
342 ret = GNUNET_new (struct GNUNET_FS_Uri);
343 ret->type = GNUNET_FS_URI_KSK;
344 ret->data.ksk.keywordCount = iret;
345 ret->data.ksk.keywords = keywords;
346 return ret;
347 CLEANUP:
348 for (i = 0; i < max; i++)
351 GNUNET_free (dup);
352 return NULL;
353}
@ GNUNET_FS_URI_KSK
Keyword search key (query with keywords).
Definition: fs_api.h:154
static char * percent_decode_keyword(const char *in, char **emsg)
Given a keyword with %-encoding (and possibly quotes to protect spaces), return a copy of the keyword...
Definition: fs_uri.c:212
#define GNUNET_FS_URI_KSK_PREFIX
Definition: fs_uri.c:262
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_new_array(n, type)
Allocate a size n array with structs or unions of the given type.
#define max(x, y)
A Universal Resource Identifier (URI), opaque.
Definition: fs_api.h:167
char ** keywords
Keywords start with a '+' if they are mandatory (in which case the '+' is NOT part of the keyword) an...
Definition: fs_api.h:186

References _, GNUNET_assert, GNUNET_free, GNUNET_FS_URI_KSK, GNUNET_FS_URI_KSK_PREFIX, GNUNET_new, GNUNET_new_array, GNUNET_strdup, consensus-simulation::int, GNUNET_FS_Uri::keywords, max, percent_decode_keyword(), and ret.

Referenced by GNUNET_FS_uri_parse().

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◆ uri_sks_parse()

static struct GNUNET_FS_Uri * uri_sks_parse ( const char *  s,
char **  emsg 
)
static

Parse an SKS URI.

Parameters
san uri string
emsgwhere to store the parser error message (if any)
Returns
NULL on error, SKS URI otherwise

Definition at line 366 of file fs_uri.c.

367{
368 struct GNUNET_FS_Uri *ret;
370 size_t pos;
371 char *end;
372
373 pos = strlen (GNUNET_FS_URI_SKS_PREFIX);
374 if ((strlen (s) <= pos) || (0 != strncmp (s, GNUNET_FS_URI_SKS_PREFIX, pos)))
375 return NULL; /* not an SKS URI */
376 end = strchr (&s[pos], '/');
377 if ((NULL == end) ||
379 end - &s[pos],
380 &ns,
381 sizeof(ns))))
382 {
383 *emsg = GNUNET_strdup (_ ("Malformed SKS URI (wrong syntax)"));
384 return NULL; /* malformed */
385 }
386 end++; /* skip over '/' */
387 ret = GNUNET_new (struct GNUNET_FS_Uri);
388 ret->type = GNUNET_FS_URI_SKS;
389 ret->data.sks.ns = ns;
390 ret->data.sks.identifier = GNUNET_strdup (end);
391 return ret;
392}
@ GNUNET_FS_URI_SKS
Signed key space (file in namespace).
Definition: fs_api.h:149
#define GNUNET_FS_URI_SKS_PREFIX
Definition: fs_uri.c:356
static int end
Set if we are to shutdown all services (including ARM).
Definition: gnunet-arm.c:34
static struct GNUNET_NAMECACHE_Handle * ns
Handle to the namecache.
@ GNUNET_OK
enum GNUNET_GenericReturnValue GNUNET_STRINGS_string_to_data(const char *enc, size_t enclen, void *out, size_t out_size)
Convert CrockfordBase32 encoding back to data.
Definition: strings.c:789
Public ECC key (always for Curve25519) encoded in a format suitable for network transmission and ECDS...

References _, end, GNUNET_FS_URI_SKS, GNUNET_FS_URI_SKS_PREFIX, GNUNET_new, GNUNET_OK, GNUNET_strdup, GNUNET_STRINGS_string_to_data(), ns, and ret.

Referenced by GNUNET_FS_uri_parse().

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◆ uri_chk_parse()

static struct GNUNET_FS_Uri * uri_chk_parse ( const char *  s,
char **  emsg 
)
static

Parse a CHK URI.

Parameters
san uri string
emsgwhere to store the parser error message (if any)
Returns
NULL on error, CHK URI otherwise

Definition at line 406 of file fs_uri.c.

407{
408 struct GNUNET_FS_Uri *ret;
409 struct FileIdentifier fi;
410 unsigned int pos;
411 unsigned long long flen;
412 size_t slen;
413 char h1[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)];
414 char h2[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)];
415
416 slen = strlen (s);
417 pos = strlen (GNUNET_FS_URI_CHK_PREFIX);
418 if ((slen < pos + 2 * sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
419 (0 != strncmp (s, GNUNET_FS_URI_CHK_PREFIX, pos)))
420 return NULL; /* not a CHK URI */
421 if ((s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
422 (s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
423 {
424 *emsg = GNUNET_strdup (_ ("Malformed CHK URI (wrong syntax)"));
425 return NULL;
426 }
427 GNUNET_memcpy (h1, &s[pos], sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded));
428 h1[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
429 GNUNET_memcpy (h2,
430 &s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)],
431 sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded));
432 h2[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
433
434 if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &fi.chk.key)) ||
435 (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &fi.chk.query)) ||
436 (1 !=
437 sscanf (&s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
438 "%llu",
439 &flen)))
440 {
441 *emsg = GNUNET_strdup (_ ("Malformed CHK URI (failed to decode CHK)"));
442 return NULL;
443 }
444 fi.file_length = GNUNET_htonll (flen);
445 ret = GNUNET_new (struct GNUNET_FS_Uri);
446 ret->type = GNUNET_FS_URI_CHK;
447 ret->data.chk = fi;
448 return ret;
449}
@ GNUNET_FS_URI_CHK
Content-hash-key (simple file).
Definition: fs_api.h:144
#define GNUNET_FS_URI_CHK_PREFIX
Definition: fs_uri.c:395
#define GNUNET_CRYPTO_hash_from_string(enc, result)
Convert ASCII encoding back to struct GNUNET_HashCode
uint64_t GNUNET_htonll(uint64_t n)
Convert unsigned 64-bit integer to network byte order.
Definition: common_endian.c:37
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
complete information needed to download a file.
Definition: fs_api.h:95
0-terminated ASCII encoding of a struct GNUNET_HashCode.

References _, FileIdentifier::chk, FileIdentifier::file_length, GNUNET_CRYPTO_hash_from_string, GNUNET_FS_URI_CHK, GNUNET_FS_URI_CHK_PREFIX, GNUNET_htonll(), GNUNET_memcpy, GNUNET_new, GNUNET_OK, GNUNET_strdup, ContentHashKey::key, ContentHashKey::query, and ret.

Referenced by GNUNET_FS_uri_parse().

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◆ uri_loc_parse()

static struct GNUNET_FS_Uri * uri_loc_parse ( const char *  s,
char **  emsg 
)
static

Parse a LOC URI.

Also verifies validity of the location URI.

Parameters
san uri string
emsgwhere to store the parser error message (if any)
Returns
NULL on error, valid LOC URI otherwise

Definition at line 496 of file fs_uri.c.

497{
498 struct GNUNET_FS_Uri *uri;
499 char h1[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)];
500 char h2[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)];
501 unsigned int pos;
502 unsigned int npos;
503 unsigned long long exptime;
504 unsigned long long flen;
505 struct GNUNET_TIME_Absolute et;
507 struct LocUriAssembly ass;
508 size_t slen;
509
510 slen = strlen (s);
511 pos = strlen (GNUNET_FS_URI_LOC_PREFIX);
512 if ((slen < pos + 2 * sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
513 (0 != strncmp (s, GNUNET_FS_URI_LOC_PREFIX, pos)))
514 return NULL; /* not a LOC URI */
515 if ((s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
516 (s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
517 {
518 *emsg = GNUNET_strdup (_ ("LOC URI malformed (wrong syntax)"));
519 return NULL;
520 }
521 GNUNET_memcpy (h1, &s[pos], sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded));
522 h1[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
523 GNUNET_memcpy (h2,
524 &s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)],
525 sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded));
526 h2[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
527
528 if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &ass.fi.chk.key)) ||
529 (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &ass.fi.chk.query)) ||
530 (1 !=
531 sscanf (&s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
532 "%llu",
533 &flen)))
534 {
535 *emsg = GNUNET_strdup (_ ("LOC URI malformed (no CHK)"));
536 return NULL;
537 }
538 ass.fi.file_length = GNUNET_htonll (flen);
539
540 npos = pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) * 2;
541 while ((s[npos] != '\0') && (s[npos] != '.'))
542 npos++;
543 if (s[npos] == '\0')
544 {
545 *emsg = GNUNET_strdup (_ ("LOC URI malformed (missing LOC)"));
546 goto ERR;
547 }
548 npos++;
549 if ((strlen (&s[npos]) <= GNUNET_CRYPTO_PKEY_ASCII_LENGTH + 1) ||
550 ('.' != s[npos + GNUNET_CRYPTO_PKEY_ASCII_LENGTH]))
551 {
552 *emsg =
553 GNUNET_strdup (_ ("LOC URI malformed (wrong syntax for public key)"));
554 }
555 if (
556 GNUNET_OK !=
559 &ass.peer.public_key))
560 {
561 *emsg =
562 GNUNET_strdup (_ ("LOC URI malformed (could not decode public key)"));
563 goto ERR;
564 }
566 if (s[npos++] != '.')
567 {
568 *emsg = GNUNET_strdup (_ ("LOC URI malformed (could not find signature)"));
569 goto ERR;
570 }
571 if ((strlen (&s[npos]) <= SIGNATURE_ASCII_LENGTH + 1) ||
572 ('.' != s[npos + SIGNATURE_ASCII_LENGTH]))
573 {
574 *emsg =
575 GNUNET_strdup (_ ("LOC URI malformed (wrong syntax for signature)"));
576 goto ERR;
577 }
578 if (GNUNET_OK !=
581 &sig,
582 sizeof(
584 {
585 *emsg =
586 GNUNET_strdup (_ ("LOC URI malformed (could not decode signature)"));
587 goto ERR;
588 }
590 if (s[npos++] != '.')
591 {
592 *emsg = GNUNET_strdup (
593 _ ("LOC URI malformed (wrong syntax for expiration time)"));
594 goto ERR;
595 }
596 if (1 != sscanf (&s[npos], "%llu", &exptime))
597 {
598 *emsg =
599 GNUNET_strdup (_ ("LOC URI malformed (could not parse expiration time)"));
600 goto ERR;
601 }
602 ass.purpose.size = htonl (sizeof(struct LocUriAssembly));
603 ass.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT);
604 et.abs_value_us = exptime * 1000LL * 1000LL;
605 ass.exptime = GNUNET_TIME_absolute_hton (et);
606 if (GNUNET_OK !=
608 &ass,
609 &sig,
610 &ass.peer.public_key))
611 {
612 *emsg =
613 GNUNET_strdup (_ ("LOC URI malformed (signature failed validation)"));
614 goto ERR;
615 }
616 uri = GNUNET_new (struct GNUNET_FS_Uri);
618 uri->data.loc.fi = ass.fi;
619 uri->data.loc.peer = ass.peer;
622
623 return uri;
624 ERR:
625 return NULL;
626}
@ GNUNET_FS_URI_LOC
Location (chk with identity of hosting peer).
Definition: fs_api.h:159
#define GNUNET_FS_URI_LOC_PREFIX
Definition: fs_uri.c:483
#define SIGNATURE_ASCII_LENGTH
Definition: fs_uri.c:485
static struct GNUNET_FS_Uri * uri
Value of URI provided on command-line (when not publishing a file but just creating UBlocks to refer ...
#define GNUNET_CRYPTO_eddsa_verify(purp, ps, sig, pub)
Verify EdDSA signature.
#define GNUNET_CRYPTO_PKEY_ASCII_LENGTH
How many characters (without 0-terminator) are our ASCII-encoded public keys (ECDSA/EDDSA/ECDHE).
enum GNUNET_GenericReturnValue GNUNET_CRYPTO_eddsa_public_key_from_string(const char *enc, size_t enclen, struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Convert a string representing a public key to a public key.
Definition: crypto_ecc.c:358
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:638
#define GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT
Signature by which a peer affirms that it is providing a certain bit of content for use in LOCation U...
an ECC signature using EdDSA.
union GNUNET_FS_Uri::@49 data
enum GNUNET_FS_UriType type
Type of the URI.
Definition: fs_api.h:171
struct Location loc
Information needed to retrieve a file including signed location (identity of a peer) of the content.
Definition: fs_api.h:218
Time for absolute times used by GNUnet, in microseconds.
Structure that defines how the contents of a location URI must be assembled in memory to create or ve...
Definition: fs_uri.c:459
struct GNUNET_TIME_Absolute expirationTime
Time when this location URI expires.
Definition: fs_api.h:127
struct GNUNET_CRYPTO_EddsaSignature contentSignature
Signature over the GNUNET_EC_FileIdentifier, peer identity and expiration time.
Definition: fs_api.h:133
struct FileIdentifier fi
Information about the shared file.
Definition: fs_api.h:117
struct GNUNET_PeerIdentity peer
Identity of the peer sharing the file.
Definition: fs_api.h:122

References _, GNUNET_TIME_Absolute::abs_value_us, FileIdentifier::chk, Location::contentSignature, GNUNET_FS_Uri::data, Location::expirationTime, LocUriAssembly::exptime, Location::fi, LocUriAssembly::fi, FileIdentifier::file_length, GNUNET_CRYPTO_eddsa_public_key_from_string(), GNUNET_CRYPTO_eddsa_verify, GNUNET_CRYPTO_hash_from_string, GNUNET_CRYPTO_PKEY_ASCII_LENGTH, GNUNET_FS_URI_LOC, GNUNET_FS_URI_LOC_PREFIX, GNUNET_htonll(), GNUNET_memcpy, GNUNET_new, GNUNET_OK, GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT, GNUNET_strdup, GNUNET_STRINGS_string_to_data(), GNUNET_TIME_absolute_hton(), ContentHashKey::key, GNUNET_FS_Uri::loc, Location::peer, LocUriAssembly::peer, GNUNET_PeerIdentity::public_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, LocUriAssembly::purpose, ContentHashKey::query, SIGNATURE_ASCII_LENGTH, GNUNET_CRYPTO_EccSignaturePurpose::size, GNUNET_FS_Uri::type, and uri.

Referenced by GNUNET_FS_uri_parse().

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◆ insert_non_mandatory_keyword()

static void insert_non_mandatory_keyword ( const char *  s,
char **  array,
int  index 
)
static

Add a keyword as non-mandatory (with ' '-prefix) to the given keyword list at offset 'index'.

The array is guaranteed to be long enough.

Parameters
skeyword to add
arrayarray to add the keyword to
indexoffset where to add the keyword

Definition at line 1400 of file fs_uri.c.

1401{
1402 char *nkword;
1403
1404 GNUNET_asprintf (&nkword,
1405 " %s", /* space to mark as 'non mandatory' */
1406 s);
1407 array[index] = nkword;
1408}
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.

References GNUNET_asprintf().

Referenced by gather_uri_data(), get_keywords_from_parens(), and get_keywords_from_tokens().

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◆ find_duplicate()

static int find_duplicate ( const char *  s,
const char **  array,
int  array_length 
)
static

Test if the given keyword s is already present in the given array, ignoring the '+'-mandatory prefix in the array.

Parameters
skeyword to test
arraykeywords to test against, with ' ' or '+' prefix to ignore
array_lengthlength of the array
Returns
GNUNET_YES if the keyword exists, GNUNET_NO if not

Definition at line 1421 of file fs_uri.c.

1422{
1423 int j;
1424
1425 for (j = array_length - 1; j >= 0; j--)
1426 if (0 == strcmp (&array[j][1], s))
1427 return GNUNET_YES;
1428 return GNUNET_NO;
1429}
@ GNUNET_YES
@ GNUNET_NO

References GNUNET_NO, and GNUNET_YES.

Referenced by gather_uri_data(), get_keywords_from_parens(), and get_keywords_from_tokens().

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◆ normalize_metadata()

static char * normalize_metadata ( enum EXTRACTOR_MetaFormat  format,
const char *  data,
size_t  data_len 
)
static

FIXME: comment.

Definition at line 1436 of file fs_uri.c.

1439{
1440 uint8_t *free_str = NULL;
1441 uint8_t *str_to_normalize = (uint8_t *) data;
1442 uint8_t *normalized;
1443 size_t r_len;
1444
1445 if (str_to_normalize == NULL)
1446 return NULL;
1447 /* Don't trust libextractor */
1448 if (format == EXTRACTOR_METAFORMAT_UTF8)
1449 {
1450 free_str = (uint8_t *) u8_check ((const uint8_t *) data, data_len);
1451 if (free_str == NULL)
1452 free_str = NULL;
1453 else
1454 format = EXTRACTOR_METAFORMAT_C_STRING;
1455 }
1456 if (format == EXTRACTOR_METAFORMAT_C_STRING)
1457 {
1458 free_str = u8_strconv_from_encoding (data,
1459 locale_charset (),
1460 iconveh_escape_sequence);
1461 if (free_str == NULL)
1462 return NULL;
1463 }
1464
1465 normalized = u8_tolower (str_to_normalize,
1466 strlen ((char *) str_to_normalize),
1467 NULL,
1468 UNINORM_NFD,
1469 NULL,
1470 &r_len);
1471 /* free_str is allocated by libunistring internally, use free() */
1472 if (free_str != NULL)
1473 free (free_str);
1474 if (normalized != NULL)
1475 {
1476 /* u8_tolower allocates a non-NULL-terminated string! */
1477 free_str = GNUNET_malloc (r_len + 1);
1478 GNUNET_memcpy (free_str, normalized, r_len);
1479 free_str[r_len] = '\0';
1480 free (normalized);
1481 normalized = free_str;
1482 }
1483 return (char *) normalized;
1484}
static char * data
The data to insert into the dht.

References data, GNUNET_malloc, and GNUNET_memcpy.

Referenced by gather_uri_data(), get_keywords_from_parens(), and get_keywords_from_tokens().

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◆ u8_strcount()

static size_t u8_strcount ( const uint8_t *  s)
static

Counts the number of UTF-8 characters (not bytes) in the string, returns that count.

Definition at line 1492 of file fs_uri.c.

1493{
1494 size_t count;
1495 ucs4_t c;
1496
1497 GNUNET_assert (s != NULL);
1498 if (s[0] == 0)
1499 return 0;
1500 for (count = 0; s != NULL; count++)
1501 s = u8_next (&c, s);
1502 return count - 1;
1503}

References GNUNET_assert.

Referenced by gather_uri_data(), get_keywords_from_parens(), and get_keywords_from_tokens().

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◆ get_keywords_from_parens()

static int get_keywords_from_parens ( const char *  s,
char **  array,
int  index 
)
static

Break the filename up by matching [], () and {} pairs to make keywords.

In case of nesting parentheses only the inner pair counts. You can't escape parentheses to scan something like "[blah\{foo]" to make a "blah{foo" keyword, this function is only a heuristic!

Parameters
sstring to break down.
arrayarray to fill with enclosed tokens. If NULL, then tokens are only counted.
indexindex at which to start filling the array (entries prior to it are used to check for duplicates). ignored if array == NULL.
Returns
number of tokens counted (including duplicates), or number of tokens extracted (excluding duplicates). 0 if there are no matching parens in the string (when counting), or when all tokens were duplicates (when extracting).

Definition at line 1523 of file fs_uri.c.

1524{
1525 int count = 0;
1526 char *open_paren;
1527 char *close_paren;
1528 char *ss;
1529 char tmp;
1530
1531 if (NULL == s)
1532 return 0;
1533 ss = GNUNET_strdup (s);
1534 open_paren = ss - 1;
1535 while (NULL != (open_paren = strpbrk (open_paren + 1, "[{(")))
1536 {
1537 int match = 0;
1538
1539 close_paren = strpbrk (open_paren + 1, "]})");
1540 if (NULL == close_paren)
1541 continue;
1542 switch (open_paren[0])
1543 {
1544 case '[':
1545 if (']' == close_paren[0])
1546 match = 1;
1547 break;
1548
1549 case '{':
1550 if ('}' == close_paren[0])
1551 match = 1;
1552 break;
1553
1554 case '(':
1555 if (')' == close_paren[0])
1556 match = 1;
1557 break;
1558
1559 default:
1560 break;
1561 }
1562 if (match && (close_paren - open_paren > 1))
1563 {
1564 tmp = close_paren[0];
1565 close_paren[0] = '\0';
1566 /* Keywords must be at least 3 characters long */
1567 if (u8_strcount ((const uint8_t *) &open_paren[1]) <= 2)
1568 {
1569 close_paren[0] = tmp;
1570 continue;
1571 }
1572 if (NULL != array)
1573 {
1574 char *normalized;
1575 if (GNUNET_NO == find_duplicate ((const char *) &open_paren[1],
1576 (const char **) array,
1577 index + count))
1578 {
1579 insert_non_mandatory_keyword ((const char *) &open_paren[1],
1580 array,
1581 index + count);
1582 count++;
1583 }
1584 normalized = normalize_metadata (EXTRACTOR_METAFORMAT_UTF8,
1585 &open_paren[1],
1586 close_paren - &open_paren[1]);
1587 if (normalized != NULL)
1588 {
1589 if (GNUNET_NO == find_duplicate ((const char *) normalized,
1590 (const char **) array,
1591 index + count))
1592 {
1593 insert_non_mandatory_keyword ((const char *) normalized,
1594 array,
1595 index + count);
1596 count++;
1597 }
1598 GNUNET_free (normalized);
1599 }
1600 }
1601 else
1602 count++;
1603 close_paren[0] = tmp;
1604 }
1605 }
1606 GNUNET_free (ss);
1607 return count;
1608}
static void insert_non_mandatory_keyword(const char *s, char **array, int index)
Add a keyword as non-mandatory (with ' '-prefix) to the given keyword list at offset 'index'.
Definition: fs_uri.c:1400
static size_t u8_strcount(const uint8_t *s)
Counts the number of UTF-8 characters (not bytes) in the string, returns that count.
Definition: fs_uri.c:1492
static char * normalize_metadata(enum EXTRACTOR_MetaFormat format, const char *data, size_t data_len)
FIXME: comment.
Definition: fs_uri.c:1436
static int find_duplicate(const char *s, const char **array, int array_length)
Test if the given keyword s is already present in the given array, ignoring the '+'-mandatory prefix ...
Definition: fs_uri.c:1421

References find_duplicate(), GNUNET_free, GNUNET_NO, GNUNET_strdup, insert_non_mandatory_keyword(), normalize_metadata(), and u8_strcount().

Referenced by GNUNET_FS_uri_ksk_create_from_meta_data().

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◆ get_keywords_from_tokens()

static int get_keywords_from_tokens ( const char *  s,
char **  array,
int  index 
)
static

Break the filename up by TOKENS to make keywords.

Parameters
sstring to break down.
arrayarray to fill with tokens. If NULL, then tokens are only counted.
indexindex at which to start filling the array (entries prior to it are used to check for duplicates). ignored if array == NULL.
Returns
number of tokens (>1) counted (including duplicates), or number of tokens extracted (excluding duplicates). 0 if there are no separators in the string (when counting), or when all tokens were duplicates (when extracting).

Definition at line 1631 of file fs_uri.c.

1632{
1633 char *p;
1634 char *ss;
1635 int seps = 0;
1636
1637 ss = GNUNET_strdup (s);
1638 for (p = strtok (ss, TOKENS); p != NULL; p = strtok (NULL, TOKENS))
1639 {
1640 /* Keywords must be at least 3 characters long */
1641 if (u8_strcount ((const uint8_t *) p) <= 2)
1642 continue;
1643 if (NULL != array)
1644 {
1645 char *normalized;
1646 if (GNUNET_NO == find_duplicate (p, (const char **) array, index + seps))
1647 {
1648 insert_non_mandatory_keyword (p, array, index + seps);
1649 seps++;
1650 }
1651 normalized =
1652 normalize_metadata (EXTRACTOR_METAFORMAT_UTF8, p, strlen (p));
1653 if (normalized != NULL)
1654 {
1655 if (GNUNET_NO == find_duplicate ((const char *) normalized,
1656 (const char **) array,
1657 index + seps))
1658 {
1659 insert_non_mandatory_keyword ((const char *) normalized,
1660 array,
1661 index + seps);
1662 seps++;
1663 }
1664 GNUNET_free (normalized);
1665 }
1666 }
1667 else
1668 seps++;
1669 }
1670 GNUNET_free (ss);
1671 return seps;
1672}
#define TOKENS
Where to break up keywords.
Definition: fs_uri.c:1614
static struct GNUNET_OS_Process * p
Helper process we started.
Definition: gnunet-uri.c:38

References find_duplicate(), GNUNET_free, GNUNET_NO, GNUNET_strdup, insert_non_mandatory_keyword(), normalize_metadata(), p, TOKENS, and u8_strcount().

Referenced by GNUNET_FS_uri_ksk_create_from_meta_data().

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◆ gather_uri_data()

static int gather_uri_data ( void *  cls,
const char *  plugin_name,
enum EXTRACTOR_MetaType  type,
enum EXTRACTOR_MetaFormat  format,
const char *  data_mime_type,
const char *  data,
size_t  data_len 
)
static

Function called on each value in the meta data.

Adds it to the URI.

Parameters
clsURI to update
plugin_namename of the plugin that produced this value; special values can be used (e.g. '<zlib>' for zlib being used in the main libextractor library and yielding meta data).
typelibextractor-type describing the meta data
formatbasic format information about data
data_mime_typemime-type of data (not of the original file); can be NULL (if mime-type is not known)
dataactual meta-data found
data_lennumber of bytes in data
Returns
0 (always)

Definition at line 1696 of file fs_uri.c.

1703{
1704 struct GNUNET_FS_Uri *uri = cls;
1705 char *normalized_data;
1706 const char *sep;
1707
1708 if ((format != EXTRACTOR_METAFORMAT_UTF8) &&
1709 (format != EXTRACTOR_METAFORMAT_C_STRING))
1710 return 0;
1711 /* Keywords must be at least 3 characters long
1712 * If given non-utf8 string it will, most likely, find it to be invalid,
1713 * and will return the length of its valid part, skipping the keyword.
1714 * If it does - fix the extractor, not this check!
1715 */if (u8_strcount ((const uint8_t *) data) <= 2)
1716 return 0;
1717 if ((EXTRACTOR_METATYPE_MIMETYPE == type) &&
1718 (NULL != (sep = memchr (data, '/', data_len))) && (sep != data))
1719 {
1720 char *xtra;
1721
1722 GNUNET_asprintf (&xtra, "mimetype:%.*s", (int) (sep - data), data);
1723 if (! find_duplicate (xtra,
1724 (const char **) uri->data.ksk.keywords,
1726 {
1731 }
1732 GNUNET_free (xtra);
1733 }
1734
1735 normalized_data = normalize_metadata (format, data, data_len);
1736 if (! find_duplicate (data,
1737 (const char **) uri->data.ksk.keywords,
1739 {
1744 }
1745 if (NULL != normalized_data)
1746 {
1747 if (! find_duplicate (normalized_data,
1748 (const char **) uri->data.ksk.keywords,
1750 {
1751 insert_non_mandatory_keyword (normalized_data,
1755 }
1756 GNUNET_free (normalized_data);
1757 }
1758 return 0;
1759}
static uint32_t type
Type string converted to DNS type value.
struct GNUNET_FS_Uri::@49::@50 ksk
unsigned int keywordCount
Size of the keywords array.
Definition: fs_api.h:191

References data, GNUNET_FS_Uri::data, find_duplicate(), GNUNET_asprintf(), GNUNET_free, insert_non_mandatory_keyword(), GNUNET_FS_Uri::keywordCount, GNUNET_FS_Uri::keywords, GNUNET_FS_Uri::ksk, normalize_metadata(), type, u8_strcount(), and uri.

Referenced by GNUNET_FS_uri_ksk_create_from_meta_data().

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◆ needs_percent()

static int needs_percent ( char  c)
static

In URI-encoding, does the given character need to be encoded using %-encoding?

Definition at line 1828 of file fs_uri.c.

1829{
1830 return(! ((isalnum ((unsigned char) c)) || (c == '-') || (c == '_') ||
1831 (c == '.') || (c == '~')));
1832}

Referenced by uri_ksk_to_string().

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◆ uri_ksk_to_string()

static char * uri_ksk_to_string ( const struct GNUNET_FS_Uri uri)
static

Convert a KSK URI to a string.

Parameters
urithe URI to convert
Returns
NULL on error (i.e. keywordCount == 0)

Definition at line 1842 of file fs_uri.c.

1843{
1844 char **keywords;
1845 unsigned int keywordCount;
1846 size_t n;
1847 char *ret;
1848 unsigned int i;
1849 unsigned int j;
1850 unsigned int wpos;
1851 size_t slen;
1852 const char *keyword;
1853
1854 if (uri->type != GNUNET_FS_URI_KSK)
1855 return NULL;
1856 keywords = uri->data.ksk.keywords;
1857 keywordCount = uri->data.ksk.keywordCount;
1858 n = keywordCount + strlen (GNUNET_FS_URI_PREFIX)
1859 + strlen (GNUNET_FS_URI_KSK_INFIX) + 1;
1860 for (i = 0; i < keywordCount; i++)
1861 {
1862 keyword = keywords[i];
1863 slen = strlen (keyword);
1864 n += slen;
1865 for (j = 0; j < slen; j++)
1866 {
1867 if ((j == 0) && (keyword[j] == ' '))
1868 {
1869 n--;
1870 continue; /* skip leading space */
1871 }
1872 if (needs_percent (keyword[j]))
1873 n += 2; /* will use %-encoding */
1874 }
1875 }
1876 ret = GNUNET_malloc (n);
1877 strcpy (ret, GNUNET_FS_URI_PREFIX);
1878 strcat (ret, GNUNET_FS_URI_KSK_INFIX);
1879 wpos = strlen (ret);
1880 for (i = 0; i < keywordCount; i++)
1881 {
1882 keyword = keywords[i];
1883 slen = strlen (keyword);
1884 for (j = 0; j < slen; j++)
1885 {
1886 if ((j == 0) && (keyword[j] == ' '))
1887 continue; /* skip leading space */
1888 if (needs_percent (keyword[j]))
1889 {
1890 sprintf (&ret[wpos], "%%%02X", (unsigned char) keyword[j]);
1891 wpos += 3;
1892 }
1893 else
1894 {
1895 ret[wpos++] = keyword[j];
1896 }
1897 }
1898 if (i != keywordCount - 1)
1899 ret[wpos++] = '+';
1900 }
1901 return ret;
1902}
static int needs_percent(char c)
In URI-encoding, does the given character need to be encoded using %-encoding?
Definition: fs_uri.c:1828
#define GNUNET_FS_URI_KSK_INFIX
#define GNUNET_FS_URI_PREFIX

References GNUNET_FS_Uri::data, GNUNET_FS_URI_KSK, GNUNET_FS_URI_KSK_INFIX, GNUNET_FS_URI_PREFIX, GNUNET_malloc, GNUNET_FS_Uri::keywordCount, GNUNET_FS_Uri::keywords, GNUNET_FS_Uri::ksk, needs_percent(), ret, GNUNET_FS_Uri::type, and uri.

Referenced by GNUNET_FS_uri_to_string().

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◆ uri_sks_to_string()

static char * uri_sks_to_string ( const struct GNUNET_FS_Uri uri)
static

Convert SKS URI to a string.

Parameters
urisks uri to convert
Returns
NULL on error

Definition at line 1912 of file fs_uri.c.

1913{
1914 char *ret;
1915 char buf[1024];
1916
1917 if (GNUNET_FS_URI_SKS != uri->type)
1918 return NULL;
1919 ret =
1921 sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey),
1922 buf,
1923 sizeof(buf));
1924 GNUNET_assert (NULL != ret);
1925 ret[0] = '\0';
1927 "%s%s%s/%s",
1930 buf,
1932 return ret;
1933}
#define GNUNET_FS_URI_SKS_INFIX
char * GNUNET_STRINGS_data_to_string(const void *data, size_t size, char *out, size_t out_size)
Convert binary data to ASCII encoding using CrockfordBase32.
Definition: strings.c:709
struct GNUNET_FS_Uri::@49::@51 sks
struct GNUNET_CRYPTO_EcdsaPublicKey ns
Identifier of the namespace.
Definition: fs_api.h:199
char * identifier
Human-readable identifier chosen for this entry in the namespace.
Definition: fs_api.h:205

References GNUNET_FS_Uri::data, GNUNET_asprintf(), GNUNET_assert, GNUNET_FS_URI_PREFIX, GNUNET_FS_URI_SKS, GNUNET_FS_URI_SKS_INFIX, GNUNET_STRINGS_data_to_string(), GNUNET_FS_Uri::identifier, GNUNET_FS_Uri::ns, ret, GNUNET_FS_Uri::sks, GNUNET_FS_Uri::type, and uri.

Referenced by GNUNET_FS_uri_to_string().

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◆ uri_chk_to_string()

static char * uri_chk_to_string ( const struct GNUNET_FS_Uri uri)
static

Convert a CHK URI to a string.

Parameters
urichk uri to convert
Returns
NULL on error

Definition at line 1943 of file fs_uri.c.

1944{
1945 const struct FileIdentifier *fi;
1946 char *ret;
1947 struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1948 struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1949
1950 if (uri->type != GNUNET_FS_URI_CHK)
1951 return NULL;
1952 fi = &uri->data.chk;
1953 GNUNET_CRYPTO_hash_to_enc (&fi->chk.key, &keyhash);
1954 GNUNET_CRYPTO_hash_to_enc (&fi->chk.query, &queryhash);
1955
1957 "%s%s%s.%s.%llu",
1960 (const char *) &keyhash,
1961 (const char *) &queryhash,
1962 (unsigned long long) GNUNET_ntohll (fi->file_length));
1963 return ret;
1964}
#define GNUNET_FS_URI_CHK_INFIX
void GNUNET_CRYPTO_hash_to_enc(const struct GNUNET_HashCode *block, struct GNUNET_CRYPTO_HashAsciiEncoded *result)
Convert hash to ASCII encoding.
Definition: crypto_hash.c:55
uint64_t GNUNET_ntohll(uint64_t n)
Convert unsigned 64-bit integer to host byte order.
Definition: common_endian.c:54
struct GNUNET_HashCode key
Hash of the original content, used for encryption.
Definition: fs.h:59
struct GNUNET_HashCode query
Hash of the encrypted content, used for querying.
Definition: fs.h:64
struct ContentHashKey chk
Query and key of the top GNUNET_EC_IBlock.
Definition: fs_api.h:104
uint64_t file_length
Total size of the file in bytes.
Definition: fs_api.h:99
struct FileIdentifier chk
Information needed to retrieve a file (content-hash-key plus file size).
Definition: fs_api.h:212

References FileIdentifier::chk, GNUNET_FS_Uri::chk, GNUNET_FS_Uri::data, FileIdentifier::file_length, GNUNET_asprintf(), GNUNET_CRYPTO_hash_to_enc(), GNUNET_FS_URI_CHK, GNUNET_FS_URI_CHK_INFIX, GNUNET_FS_URI_PREFIX, GNUNET_ntohll(), ContentHashKey::key, ContentHashKey::query, ret, GNUNET_FS_Uri::type, and uri.

Referenced by GNUNET_FS_uri_to_string().

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◆ uri_loc_to_string()

static char * uri_loc_to_string ( const struct GNUNET_FS_Uri uri)
static

Convert a LOC URI to a string.

Parameters
uriloc uri to convert
Returns
NULL on error

Definition at line 1974 of file fs_uri.c.

1975{
1976 char *ret;
1977 struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1978 struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1979 char *peer_id;
1980 char peer_sig[SIGNATURE_ASCII_LENGTH + 1];
1981
1984 peer_id =
1987 NULL !=
1989 sizeof(struct GNUNET_CRYPTO_EddsaSignature),
1990 peer_sig,
1991 sizeof(peer_sig)));
1993 "%s%s%s.%s.%llu.%s.%s.%llu",
1996 (const char *) &keyhash,
1997 (const char *) &queryhash,
1998 (unsigned long long) GNUNET_ntohll (
2000 peer_id,
2001 peer_sig,
2002 (unsigned long long)
2004 / 1000000LL);
2006 return ret;
2007}
static char * peer_id
Option –peer.
Definition: gnunet-cadet.c:42
#define GNUNET_FS_URI_LOC_INFIX
char * GNUNET_CRYPTO_eddsa_public_key_to_string(const struct GNUNET_CRYPTO_EddsaPublicKey *pub)
Convert a public key to a string.
Definition: crypto_ecc.c:252
struct GNUNET_CRYPTO_EddsaPublicKey public_key
uint64_t abs_value_us
The actual value.

References GNUNET_TIME_Absolute::abs_value_us, FileIdentifier::chk, Location::contentSignature, GNUNET_FS_Uri::data, Location::expirationTime, Location::fi, FileIdentifier::file_length, GNUNET_asprintf(), GNUNET_assert, GNUNET_CRYPTO_eddsa_public_key_to_string(), GNUNET_CRYPTO_hash_to_enc(), GNUNET_free, GNUNET_FS_URI_LOC_INFIX, GNUNET_FS_URI_PREFIX, GNUNET_ntohll(), GNUNET_STRINGS_data_to_string(), ContentHashKey::key, GNUNET_FS_Uri::loc, Location::peer, peer_id, GNUNET_PeerIdentity::public_key, ContentHashKey::query, ret, SIGNATURE_ASCII_LENGTH, and uri.

Referenced by GNUNET_FS_uri_to_string().

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