GNUnet  0.11.x
Data Structures | Macros | Functions
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_CONTAINER_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:

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 269 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 363 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 402 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 490 of file fs_uri.c.

◆ SIGNATURE_ASCII_LENGTH

#define SIGNATURE_ASCII_LENGTH   103

Definition at line 492 of file fs_uri.c.

◆ TOKENS

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

Where to break up keywords.

Definition at line 1630 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 219 of file fs_uri.c.

220 {
221  char *out;
222  char *ret;
223  unsigned int rpos;
224  unsigned int wpos;
225  unsigned int hx;
226 
227  out = GNUNET_strdup (in);
228  rpos = 0;
229  wpos = 0;
230  while (out[rpos] != '\0')
231  {
232  if (out[rpos] == '%')
233  {
234  if (1 != sscanf (&out[rpos + 1], "%2X", &hx))
235  {
236  GNUNET_free (out);
237  *emsg = GNUNET_strdup (
238  _ ( /* xgettext:no-c-format */
239  "Malformed KSK URI (`%' must be followed by HEX number)"));
240  return NULL;
241  }
242  rpos += 3;
243  if (hx == '"')
244  continue; /* skip double quote */
245  out[wpos++] = (char) hx;
246  }
247  else
248  {
249  out[wpos++] = out[rpos++];
250  }
251  }
252  out[wpos] = '\0';
253  if (out[0] == '+')
254  {
255  ret = GNUNET_strdup (out);
256  }
257  else
258  {
259  /* need to prefix with space */
260  ret = GNUNET_malloc (strlen (out) + 2);
261  strcpy (ret, " ");
262  strcat (ret, out);
263  }
264  GNUNET_free (out);
265  return ret;
266 }
static int ret
Return value of the commandline.
Definition: gnunet-abd.c:81
#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:177

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 279 of file fs_uri.c.

280 {
281  struct GNUNET_FS_Uri *ret;
282  char **keywords;
283  unsigned int pos;
284  int max;
285  int iret;
286  int i;
287  size_t slen;
288  char *dup;
289  int saw_quote;
290 
291  slen = strlen (s);
292  pos = strlen (GNUNET_FS_URI_KSK_PREFIX);
293  if ((slen <= pos) || (0 != strncmp (s, GNUNET_FS_URI_KSK_PREFIX, pos)))
294  return NULL; /* not KSK URI */
295  if ((s[slen - 1] == '+') || (s[pos] == '+'))
296  {
297  *emsg =
298  GNUNET_strdup (_ ("Malformed KSK URI (must not begin or end with `+')"));
299  return NULL;
300  }
301  max = 1;
302  saw_quote = 0;
303  for (i = pos; i < slen; i++)
304  {
305  if ((s[i] == '%') && (&s[i] == strstr (&s[i], "%22")))
306  {
307  saw_quote = (saw_quote + 1) % 2;
308  i += 3;
309  continue;
310  }
311  if ((s[i] == '+') && (saw_quote == 0))
312  {
313  max++;
314  if (s[i - 1] == '+')
315  {
316  *emsg = GNUNET_strdup (_ ("Malformed KSK URI (`++' not allowed)"));
317  return NULL;
318  }
319  }
320  }
321  if (saw_quote == 1)
322  {
323  *emsg = GNUNET_strdup (_ ("Malformed KSK URI (quotes not balanced)"));
324  return NULL;
325  }
326  iret = max;
327  dup = GNUNET_strdup (s);
328  keywords = GNUNET_new_array (max, char *);
329  for (i = slen - 1; i >= (int) pos; i--)
330  {
331  if ((s[i] == '%') && (&s[i] == strstr (&s[i], "%22")))
332  {
333  saw_quote = (saw_quote + 1) % 2;
334  continue;
335  }
336  if ((dup[i] == '+') && (saw_quote == 0))
337  {
338  keywords[--max] = percent_decode_keyword (&dup[i + 1], emsg);
339  if (NULL == keywords[max])
340  goto CLEANUP;
341  dup[i] = '\0';
342  }
343  }
344  keywords[--max] = percent_decode_keyword (&dup[pos], emsg);
345  if (NULL == keywords[max])
346  goto CLEANUP;
347  GNUNET_assert (0 == max);
348  GNUNET_free (dup);
349  ret = GNUNET_new (struct GNUNET_FS_Uri);
350  ret->type = GNUNET_FS_URI_KSK;
351  ret->data.ksk.keywordCount = iret;
352  ret->data.ksk.keywords = keywords;
353  return ret;
354 CLEANUP:
355  for (i = 0; i < max; i++)
356  GNUNET_free (keywords[i]);
358  GNUNET_free (dup);
359  return NULL;
360 }
@ GNUNET_FS_URI_KSK
Keyword search key (query with keywords).
Definition: fs_api.h:153
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:219
#define GNUNET_FS_URI_KSK_PREFIX
Definition: fs_uri.c:269
#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:166
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:185

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 373 of file fs_uri.c.

374 {
375  struct GNUNET_FS_Uri *ret;
377  size_t pos;
378  char *end;
379 
380  pos = strlen (GNUNET_FS_URI_SKS_PREFIX);
381  if ((strlen (s) <= pos) || (0 != strncmp (s, GNUNET_FS_URI_SKS_PREFIX, pos)))
382  return NULL; /* not an SKS URI */
383  end = strchr (&s[pos], '/');
384  if ((NULL == end) ||
386  end - &s[pos],
387  &ns,
388  sizeof(ns))))
389  {
390  *emsg = GNUNET_strdup (_ ("Malformed SKS URI (wrong syntax)"));
391  return NULL; /* malformed */
392  }
393  end++; /* skip over '/' */
394  ret = GNUNET_new (struct GNUNET_FS_Uri);
395  ret->type = GNUNET_FS_URI_SKS;
396  ret->data.sks.ns = ns;
397  ret->data.sks.identifier = GNUNET_strdup (end);
398  return ret;
399 }
@ GNUNET_FS_URI_SKS
Signed key space (file in namespace).
Definition: fs_api.h:148
#define GNUNET_FS_URI_SKS_PREFIX
Definition: fs_uri.c:363
static struct GNUNET_NAMESTORE_Handle * ns
Handle to the namestore.
Definition: gnunet-abd.c:41
static int end
Set if we are to shutdown all services (including ARM).
Definition: gnunet-arm.c:34
@ GNUNET_OK
Definition: gnunet_common.h:95
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 413 of file fs_uri.c.

414 {
415  struct GNUNET_FS_Uri *ret;
416  struct FileIdentifier fi;
417  unsigned int pos;
418  unsigned long long flen;
419  size_t slen;
420  char h1[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)];
421  char h2[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)];
422 
423  slen = strlen (s);
424  pos = strlen (GNUNET_FS_URI_CHK_PREFIX);
425  if ((slen < pos + 2 * sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
426  (0 != strncmp (s, GNUNET_FS_URI_CHK_PREFIX, pos)))
427  return NULL; /* not a CHK URI */
428  if ((s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
429  (s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
430  {
431  *emsg = GNUNET_strdup (_ ("Malformed CHK URI (wrong syntax)"));
432  return NULL;
433  }
434  GNUNET_memcpy (h1, &s[pos], sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded));
435  h1[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
436  GNUNET_memcpy (h2,
437  &s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)],
438  sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded));
439  h2[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
440 
441  if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &fi.chk.key)) ||
442  (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &fi.chk.query)) ||
443  (1 !=
444  sscanf (&s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
445  "%llu",
446  &flen)))
447  {
448  *emsg = GNUNET_strdup (_ ("Malformed CHK URI (failed to decode CHK)"));
449  return NULL;
450  }
451  fi.file_length = GNUNET_htonll (flen);
452  ret = GNUNET_new (struct GNUNET_FS_Uri);
453  ret->type = GNUNET_FS_URI_CHK;
454  ret->data.chk = fi;
455  return ret;
456 }
@ GNUNET_FS_URI_CHK
Content-hash-key (simple file).
Definition: fs_api.h:143
#define GNUNET_FS_URI_CHK_PREFIX
Definition: fs_uri.c:402
uint64_t GNUNET_htonll(uint64_t n)
Convert unsigned 64-bit integer to network byte order.
Definition: common_endian.c:36
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_CRYPTO_hash_from_string(enc, result)
Convert ASCII encoding back to struct GNUNET_HashCode
complete information needed to download a file.
Definition: fs_api.h:94
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 503 of file fs_uri.c.

504 {
505  struct GNUNET_FS_Uri *uri;
506  char h1[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)];
507  char h2[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)];
508  unsigned int pos;
509  unsigned int npos;
510  unsigned long long exptime;
511  unsigned long long flen;
512  struct GNUNET_TIME_Absolute et;
513  struct GNUNET_CRYPTO_EddsaSignature sig;
514  struct LocUriAssembly ass;
515  size_t slen;
516 
517  slen = strlen (s);
518  pos = strlen (GNUNET_FS_URI_LOC_PREFIX);
519  if ((slen < pos + 2 * sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) + 1) ||
520  (0 != strncmp (s, GNUNET_FS_URI_LOC_PREFIX, pos)))
521  return NULL; /* not a LOC URI */
522  if ((s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] != '.') ||
523  (s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) * 2 - 1] != '.'))
524  {
525  *emsg = GNUNET_strdup (_ ("LOC URI malformed (wrong syntax)"));
526  return NULL;
527  }
528  GNUNET_memcpy (h1, &s[pos], sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded));
529  h1[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
530  GNUNET_memcpy (h2,
531  &s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded)],
532  sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded));
533  h2[sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) - 1] = '\0';
534 
535  if ((GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h1, &ass.fi.chk.key)) ||
536  (GNUNET_OK != GNUNET_CRYPTO_hash_from_string (h2, &ass.fi.chk.query)) ||
537  (1 !=
538  sscanf (&s[pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) * 2],
539  "%llu",
540  &flen)))
541  {
542  *emsg = GNUNET_strdup (_ ("LOC URI malformed (no CHK)"));
543  return NULL;
544  }
545  ass.fi.file_length = GNUNET_htonll (flen);
546 
547  npos = pos + sizeof(struct GNUNET_CRYPTO_HashAsciiEncoded) * 2;
548  while ((s[npos] != '\0') && (s[npos] != '.'))
549  npos++;
550  if (s[npos] == '\0')
551  {
552  *emsg = GNUNET_strdup (_ ("LOC URI malformed (missing LOC)"));
553  goto ERR;
554  }
555  npos++;
556  if ((strlen (&s[npos]) <= GNUNET_CRYPTO_PKEY_ASCII_LENGTH + 1) ||
557  ('.' != s[npos + GNUNET_CRYPTO_PKEY_ASCII_LENGTH]))
558  {
559  *emsg =
560  GNUNET_strdup (_ ("LOC URI malformed (wrong syntax for public key)"));
561  }
562  if (
563  GNUNET_OK !=
566  &ass.peer.public_key))
567  {
568  *emsg =
569  GNUNET_strdup (_ ("LOC URI malformed (could not decode public key)"));
570  goto ERR;
571  }
573  if (s[npos++] != '.')
574  {
575  *emsg = GNUNET_strdup (_ ("LOC URI malformed (could not find signature)"));
576  goto ERR;
577  }
578  if ((strlen (&s[npos]) <= SIGNATURE_ASCII_LENGTH + 1) ||
579  ('.' != s[npos + SIGNATURE_ASCII_LENGTH]))
580  {
581  *emsg =
582  GNUNET_strdup (_ ("LOC URI malformed (wrong syntax for signature)"));
583  goto ERR;
584  }
585  if (GNUNET_OK !=
588  &sig,
589  sizeof(
591  {
592  *emsg =
593  GNUNET_strdup (_ ("LOC URI malformed (could not decode signature)"));
594  goto ERR;
595  }
596  npos += SIGNATURE_ASCII_LENGTH;
597  if (s[npos++] != '.')
598  {
599  *emsg = GNUNET_strdup (
600  _ ("LOC URI malformed (wrong syntax for expiration time)"));
601  goto ERR;
602  }
603  if (1 != sscanf (&s[npos], "%llu", &exptime))
604  {
605  *emsg =
606  GNUNET_strdup (_ ("LOC URI malformed (could not parse expiration time)"));
607  goto ERR;
608  }
609  ass.purpose.size = htonl (sizeof(struct LocUriAssembly));
610  ass.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_PEER_PLACEMENT);
611  et.abs_value_us = exptime * 1000LL * 1000LL;
612  ass.exptime = GNUNET_TIME_absolute_hton (et);
613  if (GNUNET_OK !=
615  &ass,
616  &sig,
617  &ass.peer.public_key))
618  {
619  *emsg =
620  GNUNET_strdup (_ ("LOC URI malformed (signature failed validation)"));
621  goto ERR;
622  }
623  uri = GNUNET_new (struct GNUNET_FS_Uri);
625  uri->data.loc.fi = ass.fi;
626  uri->data.loc.peer = ass.peer;
627  uri->data.loc.expirationTime = et;
628  uri->data.loc.contentSignature = sig;
629 
630  return uri;
631 ERR:
632  return NULL;
633 }
@ GNUNET_FS_URI_LOC
Location (chk with identity of hosting peer).
Definition: fs_api.h:158
#define GNUNET_FS_URI_LOC_PREFIX
Definition: fs_uri.c:490
#define SIGNATURE_ASCII_LENGTH
Definition: fs_uri.c:492
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_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:357
#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...
#define GNUNET_CRYPTO_eddsa_verify(purp, ps, sig, pub)
Verify EdDSA signature.
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:637
an ECC signature using EdDSA.
union GNUNET_FS_Uri::@13 data
enum GNUNET_FS_UriType type
Type of the URI.
Definition: fs_api.h:170
struct Location loc
Information needed to retrieve a file including signed location (identity of a peer) of the content.
Definition: fs_api.h:217
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:466
struct GNUNET_TIME_Absolute expirationTime
Time when this location URI expires.
Definition: fs_api.h:126
struct GNUNET_CRYPTO_EddsaSignature contentSignature
Signature over the GNUNET_EC_FileIdentifier, peer identity and expiration time.
Definition: fs_api.h:132
struct FileIdentifier fi
Information about the shared file.
Definition: fs_api.h:116
struct GNUNET_PeerIdentity peer
Identity of the peer sharing the file.
Definition: fs_api.h:121

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, LocUriAssembly::purpose, GNUNET_CRYPTO_EccSignaturePurpose::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 1416 of file fs_uri.c.

1417 {
1418  char *nkword;
1419 
1420  GNUNET_asprintf (&nkword,
1421  " %s", /* space to mark as 'non mandatory' */
1422  s);
1423  array[index] = nkword;
1424 }
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 1437 of file fs_uri.c.

1438 {
1439  int j;
1440 
1441  for (j = array_length - 1; j >= 0; j--)
1442  if (0 == strcmp (&array[j][1], s))
1443  return GNUNET_YES;
1444  return GNUNET_NO;
1445 }
@ GNUNET_YES
Definition: gnunet_common.h:97
@ GNUNET_NO
Definition: gnunet_common.h:94

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 1452 of file fs_uri.c.

1455 {
1456  uint8_t *free_str = NULL;
1457  uint8_t *str_to_normalize = (uint8_t *) data;
1458  uint8_t *normalized;
1459  size_t r_len;
1460 
1461  if (str_to_normalize == NULL)
1462  return NULL;
1463  /* Don't trust libextractor */
1464  if (format == EXTRACTOR_METAFORMAT_UTF8)
1465  {
1466  free_str = (uint8_t *) u8_check ((const uint8_t *) data, data_len);
1467  if (free_str == NULL)
1468  free_str = NULL;
1469  else
1471  }
1472  if (format == EXTRACTOR_METAFORMAT_C_STRING)
1473  {
1474  free_str = u8_strconv_from_encoding (data,
1475  locale_charset (),
1476  iconveh_escape_sequence);
1477  if (free_str == NULL)
1478  return NULL;
1479  }
1480 
1481  normalized = u8_tolower (str_to_normalize,
1482  strlen ((char *) str_to_normalize),
1483  NULL,
1484  UNINORM_NFD,
1485  NULL,
1486  &r_len);
1487  /* free_str is allocated by libunistring internally, use free() */
1488  if (free_str != NULL)
1489  free (free_str);
1490  if (normalized != NULL)
1491  {
1492  /* u8_tolower allocates a non-NULL-terminated string! */
1493  free_str = GNUNET_malloc (r_len + 1);
1494  GNUNET_memcpy (free_str, normalized, r_len);
1495  free_str[r_len] = '\0';
1496  free (normalized);
1497  normalized = free_str;
1498  }
1499  return (char *) normalized;
1500 }
uint32_t data
The data value.
@ EXTRACTOR_METAFORMAT_C_STRING
0-terminated string.
@ EXTRACTOR_METAFORMAT_UTF8
0-terminated, UTF-8 encoded string.

References data, EXTRACTOR_METAFORMAT_C_STRING, EXTRACTOR_METAFORMAT_UTF8, 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 1508 of file fs_uri.c.

1509 {
1510  size_t count;
1511  ucs4_t c;
1512 
1513  GNUNET_assert (s != NULL);
1514  if (s[0] == 0)
1515  return 0;
1516  for (count = 0; s != NULL; count++)
1517  s = u8_next (&c, s);
1518  return count - 1;
1519 }

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 1539 of file fs_uri.c.

1540 {
1541  int count = 0;
1542  char *open_paren;
1543  char *close_paren;
1544  char *ss;
1545  char tmp;
1546 
1547  if (NULL == s)
1548  return 0;
1549  ss = GNUNET_strdup (s);
1550  open_paren = ss - 1;
1551  while (NULL != (open_paren = strpbrk (open_paren + 1, "[{(")))
1552  {
1553  int match = 0;
1554 
1555  close_paren = strpbrk (open_paren + 1, "]})");
1556  if (NULL == close_paren)
1557  continue;
1558  switch (open_paren[0])
1559  {
1560  case '[':
1561  if (']' == close_paren[0])
1562  match = 1;
1563  break;
1564 
1565  case '{':
1566  if ('}' == close_paren[0])
1567  match = 1;
1568  break;
1569 
1570  case '(':
1571  if (')' == close_paren[0])
1572  match = 1;
1573  break;
1574 
1575  default:
1576  break;
1577  }
1578  if (match && (close_paren - open_paren > 1))
1579  {
1580  tmp = close_paren[0];
1581  close_paren[0] = '\0';
1582  /* Keywords must be at least 3 characters long */
1583  if (u8_strcount ((const uint8_t *) &open_paren[1]) <= 2)
1584  {
1585  close_paren[0] = tmp;
1586  continue;
1587  }
1588  if (NULL != array)
1589  {
1590  char *normalized;
1591  if (GNUNET_NO == find_duplicate ((const char *) &open_paren[1],
1592  (const char **) array,
1593  index + count))
1594  {
1595  insert_non_mandatory_keyword ((const char *) &open_paren[1],
1596  array,
1597  index + count);
1598  count++;
1599  }
1601  &open_paren[1],
1602  close_paren - &open_paren[1]);
1603  if (normalized != NULL)
1604  {
1605  if (GNUNET_NO == find_duplicate ((const char *) normalized,
1606  (const char **) array,
1607  index + count))
1608  {
1609  insert_non_mandatory_keyword ((const char *) normalized,
1610  array,
1611  index + count);
1612  count++;
1613  }
1614  GNUNET_free (normalized);
1615  }
1616  }
1617  else
1618  count++;
1619  close_paren[0] = tmp;
1620  }
1621  }
1622  GNUNET_free (ss);
1623  return count;
1624 }
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:1416
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:1508
static char * normalize_metadata(enum EXTRACTOR_MetaFormat format, const char *data, size_t data_len)
FIXME: comment.
Definition: fs_uri.c:1452
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:1437

References EXTRACTOR_METAFORMAT_UTF8, 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 1647 of file fs_uri.c.

1648 {
1649  char *p;
1650  char *ss;
1651  int seps = 0;
1652 
1653  ss = GNUNET_strdup (s);
1654  for (p = strtok (ss, TOKENS); p != NULL; p = strtok (NULL, TOKENS))
1655  {
1656  /* Keywords must be at least 3 characters long */
1657  if (u8_strcount ((const uint8_t *) p) <= 2)
1658  continue;
1659  if (NULL != array)
1660  {
1661  char *normalized;
1662  if (GNUNET_NO == find_duplicate (p, (const char **) array, index + seps))
1663  {
1664  insert_non_mandatory_keyword (p, array, index + seps);
1665  seps++;
1666  }
1667  normalized =
1669  if (normalized != NULL)
1670  {
1671  if (GNUNET_NO == find_duplicate ((const char *) normalized,
1672  (const char **) array,
1673  index + seps))
1674  {
1675  insert_non_mandatory_keyword ((const char *) normalized,
1676  array,
1677  index + seps);
1678  seps++;
1679  }
1680  GNUNET_free (normalized);
1681  }
1682  }
1683  else
1684  seps++;
1685  }
1686  GNUNET_free (ss);
1687  return seps;
1688 }
#define TOKENS
Where to break up keywords.
Definition: fs_uri.c:1630
static struct GNUNET_OS_Process * p
Helper process we started.
Definition: gnunet-uri.c:37

References EXTRACTOR_METAFORMAT_UTF8, 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 1712 of file fs_uri.c.

1719 {
1720  struct GNUNET_FS_Uri *uri = cls;
1721  char *normalized_data;
1722  const char *sep;
1723 
1724  if ((format != EXTRACTOR_METAFORMAT_UTF8) &&
1725  (format != EXTRACTOR_METAFORMAT_C_STRING))
1726  return 0;
1727  /* Keywords must be at least 3 characters long
1728  * If given non-utf8 string it will, most likely, find it to be invalid,
1729  * and will return the length of its valid part, skipping the keyword.
1730  * If it does - fix the extractor, not this check!
1731  */if (u8_strcount ((const uint8_t *) data) <= 2)
1732  return 0;
1733  if ((EXTRACTOR_METATYPE_MIMETYPE == type) &&
1734  (NULL != (sep = memchr (data, '/', data_len))) && (sep != data))
1735  {
1736  char *xtra;
1737 
1738  GNUNET_asprintf (&xtra, "mimetype:%.*s", (int) (sep - data), data);
1739  if (! find_duplicate (xtra,
1740  (const char **) uri->data.ksk.keywords,
1741  uri->data.ksk.keywordCount))
1742  {
1744  uri->data.ksk.keywords,
1745  uri->data.ksk.keywordCount);
1746  uri->data.ksk.keywordCount++;
1747  }
1748  GNUNET_free (xtra);
1749  }
1750 
1751  normalized_data = normalize_metadata (format, data, data_len);
1752  if (! find_duplicate (data,
1753  (const char **) uri->data.ksk.keywords,
1754  uri->data.ksk.keywordCount))
1755  {
1757  uri->data.ksk.keywords,
1758  uri->data.ksk.keywordCount);
1759  uri->data.ksk.keywordCount++;
1760  }
1761  if (NULL != normalized_data)
1762  {
1763  if (! find_duplicate (normalized_data,
1764  (const char **) uri->data.ksk.keywords,
1765  uri->data.ksk.keywordCount))
1766  {
1767  insert_non_mandatory_keyword (normalized_data,
1768  uri->data.ksk.keywords,
1769  uri->data.ksk.keywordCount);
1770  uri->data.ksk.keywordCount++;
1771  }
1772  GNUNET_free (normalized_data);
1773  }
1774  return 0;
1775 }
@ EXTRACTOR_METATYPE_MIMETYPE
struct GNUNET_FS_Uri::@13::@14 ksk
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model

References GNUNET_FS_Uri::data, data, EXTRACTOR_METAFORMAT_C_STRING, EXTRACTOR_METAFORMAT_UTF8, EXTRACTOR_METATYPE_MIMETYPE, find_duplicate(), GNUNET_asprintf(), GNUNET_free, insert_non_mandatory_keyword(), 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 1844 of file fs_uri.c.

1845 {
1846  return(! ((isalnum ((unsigned char) c)) || (c == '-') || (c == '_') ||
1847  (c == '.') || (c == '~')));
1848 }

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 1858 of file fs_uri.c.

1859 {
1860  char **keywords;
1861  unsigned int keywordCount;
1862  size_t n;
1863  char *ret;
1864  unsigned int i;
1865  unsigned int j;
1866  unsigned int wpos;
1867  size_t slen;
1868  const char *keyword;
1869 
1870  if (uri->type != GNUNET_FS_URI_KSK)
1871  return NULL;
1872  keywords = uri->data.ksk.keywords;
1873  keywordCount = uri->data.ksk.keywordCount;
1874  n = keywordCount + strlen (GNUNET_FS_URI_PREFIX)
1875  + strlen (GNUNET_FS_URI_KSK_INFIX) + 1;
1876  for (i = 0; i < keywordCount; i++)
1877  {
1878  keyword = keywords[i];
1879  slen = strlen (keyword);
1880  n += slen;
1881  for (j = 0; j < slen; j++)
1882  {
1883  if ((j == 0) && (keyword[j] == ' '))
1884  {
1885  n--;
1886  continue; /* skip leading space */
1887  }
1888  if (needs_percent (keyword[j]))
1889  n += 2; /* will use %-encoding */
1890  }
1891  }
1892  ret = GNUNET_malloc (n);
1893  strcpy (ret, GNUNET_FS_URI_PREFIX);
1894  strcat (ret, GNUNET_FS_URI_KSK_INFIX);
1895  wpos = strlen (ret);
1896  for (i = 0; i < keywordCount; i++)
1897  {
1898  keyword = keywords[i];
1899  slen = strlen (keyword);
1900  for (j = 0; j < slen; j++)
1901  {
1902  if ((j == 0) && (keyword[j] == ' '))
1903  continue; /* skip leading space */
1904  if (needs_percent (keyword[j]))
1905  {
1906  sprintf (&ret[wpos], "%%%02X", (unsigned char) keyword[j]);
1907  wpos += 3;
1908  }
1909  else
1910  {
1911  ret[wpos++] = keyword[j];
1912  }
1913  }
1914  if (i != keywordCount - 1)
1915  ret[wpos++] = '+';
1916  }
1917  return ret;
1918 }
static int needs_percent(char c)
In URI-encoding, does the given character need to be encoded using %-encoding?
Definition: fs_uri.c:1844
#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.

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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 1928 of file fs_uri.c.

1929 {
1930  char *ret;
1931  char buf[1024];
1932 
1933  if (GNUNET_FS_URI_SKS != uri->type)
1934  return NULL;
1935  ret =
1937  sizeof(struct GNUNET_CRYPTO_EcdsaPublicKey),
1938  buf,
1939  sizeof(buf));
1940  GNUNET_assert (NULL != ret);
1941  ret[0] = '\0';
1942  GNUNET_asprintf (&ret,
1943  "%s%s%s/%s",
1946  buf,
1947  uri->data.sks.identifier);
1948  return ret;
1949 }
static char buf[2048]
#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::@13::@15 sks

References buf, 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(), ret, GNUNET_FS_Uri::sks, GNUNET_FS_Uri::type, and uri.

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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 1959 of file fs_uri.c.

1960 {
1961  const struct FileIdentifier *fi;
1962  char *ret;
1963  struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1964  struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1965 
1966  if (uri->type != GNUNET_FS_URI_CHK)
1967  return NULL;
1968  fi = &uri->data.chk;
1969  GNUNET_CRYPTO_hash_to_enc (&fi->chk.key, &keyhash);
1970  GNUNET_CRYPTO_hash_to_enc (&fi->chk.query, &queryhash);
1971 
1972  GNUNET_asprintf (&ret,
1973  "%s%s%s.%s.%llu",
1976  (const char *) &keyhash,
1977  (const char *) &queryhash,
1978  (unsigned long long) GNUNET_ntohll (fi->file_length));
1979  return ret;
1980 }
uint64_t GNUNET_ntohll(uint64_t n)
Convert unsigned 64-bit integer to host byte order.
Definition: common_endian.c:53
#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
struct GNUNET_HashCode key
Hash of the original content, used for encryption.
Definition: fs.h:58
struct GNUNET_HashCode query
Hash of the encrypted content, used for querying.
Definition: fs.h:63
struct ContentHashKey chk
Query and key of the top GNUNET_EC_IBlock.
Definition: fs_api.h:103
uint64_t file_length
Total size of the file in bytes.
Definition: fs_api.h:98
struct FileIdentifier chk
Information needed to retrieve a file (content-hash-key plus file size).
Definition: fs_api.h:211

References GNUNET_FS_Uri::chk, FileIdentifier::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.

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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 1990 of file fs_uri.c.

1991 {
1992  char *ret;
1993  struct GNUNET_CRYPTO_HashAsciiEncoded keyhash;
1994  struct GNUNET_CRYPTO_HashAsciiEncoded queryhash;
1995  char *peer_id;
1996  char peer_sig[SIGNATURE_ASCII_LENGTH + 1];
1997 
1998  GNUNET_CRYPTO_hash_to_enc (&uri->data.loc.fi.chk.key, &keyhash);
1999  GNUNET_CRYPTO_hash_to_enc (&uri->data.loc.fi.chk.query, &queryhash);
2000  peer_id =
2002  GNUNET_assert (
2003  NULL !=
2005  sizeof(struct GNUNET_CRYPTO_EddsaSignature),
2006  peer_sig,
2007  sizeof(peer_sig)));
2008  GNUNET_asprintf (&ret,
2009  "%s%s%s.%s.%llu.%s.%s.%llu",
2012  (const char *) &keyhash,
2013  (const char *) &queryhash,
2014  (unsigned long long) GNUNET_ntohll (
2016  peer_id,
2017  peer_sig,
2018  (unsigned long long)
2020  / 1000000LL);
2021  GNUNET_free (peer_id);
2022  return ret;
2023 }
static char * peer_id
Option –peer.
Definition: gnunet-cadet.c:42
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:251
#define GNUNET_FS_URI_LOC_INFIX
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.

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