GNUnet  0.17.6
plugin_gnsrecord_abd.c
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1 /*
2  This file is part of GNUnet
3  Copyright (C) 2013 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19 */
20 
26 #include "platform.h"
27 
28 #include "gnunet_util_lib.h"
29 
30 #include "delegate_misc.h"
31 #include "abd_serialization.h"
32 #include "gnunet_abd_service.h"
33 #include "gnunet_gnsrecord_lib.h"
35 #include "gnunet_signatures.h"
45 static char *
47  uint32_t type,
48  const void *data,
49  size_t data_size)
50 {
51  const char *cdata;
52 
53  switch (type)
54  {
56  {
57  struct GNUNET_ABD_DelegationRecord sets;
58  char *attr_str;
59  char *subject_pkey;
60  char *tmp_str;
61  int i;
62  if (data_size < sizeof (struct GNUNET_ABD_DelegationRecord))
63  return NULL; /* malformed */
64 
65  GNUNET_memcpy (&sets, data, sizeof (sets));
66  cdata = data;
67 
68  struct GNUNET_ABD_DelegationSet set[ntohl (sets.set_count)];
69  if (GNUNET_OK !=
71  sets.data_size),
72  &cdata[sizeof (sets)],
73  ntohl (sets.set_count),
74  set))
75  return NULL;
76 
77  for (i = 0; i < ntohl (sets.set_count); i++)
78  {
79  subject_pkey =
81 
82  if (0 == set[i].subject_attribute_len)
83  {
84  if (0 == i)
85  {
86  GNUNET_asprintf (&attr_str, "%s", subject_pkey);
87  }
88  else
89  {
90  GNUNET_asprintf (&tmp_str, "%s,%s", attr_str, subject_pkey);
91  GNUNET_free (attr_str);
92  attr_str = tmp_str;
93  }
94  }
95  else
96  {
97  if (0 == i)
98  {
99  GNUNET_asprintf (&attr_str,
100  "%s %s",
101  subject_pkey,
102  set[i].subject_attribute);
103  }
104  else
105  {
106  GNUNET_asprintf (&tmp_str,
107  "%s,%s %s",
108  attr_str,
109  subject_pkey,
110  set[i].subject_attribute);
111  GNUNET_free (attr_str);
112  attr_str = tmp_str;
113  }
114  }
116  }
117  return attr_str;
118  }
120  {
121  struct GNUNET_ABD_Delegate *cred;
122  char *cred_str;
123 
125  cred_str = GNUNET_ABD_delegate_to_string (cred);
126  GNUNET_free (cred);
127  return cred_str;
128  }
129  default:
130  return NULL;
131  }
132 }
133 
134 
146 static int
148  uint32_t type,
149  const char *s,
150  void **data,
151  size_t *data_size)
152 {
153  if (NULL == s)
154  return GNUNET_SYSERR;
155  switch (type)
156  {
158  {
159  struct GNUNET_ABD_DelegationRecord *sets;
160  char attr_str[253 + 1];
161  char subject_pkey[58 + 1];
162  char *token;
163  char *tmp_str;
164  int matches = 0;
165  int entries;
166  size_t tmp_data_size;
167  int i;
168 
169  tmp_str = GNUNET_strdup (s);
170  token = strtok (tmp_str, ",");
171  entries = 0;
172  tmp_data_size = 0;
173  *data_size = sizeof (struct GNUNET_ABD_DelegationRecord);
174  while (NULL != token)
175  {
176  // also fills the variables subject_pley and attr_str if "regex"-like match
177  matches = sscanf (token, "%s %s", subject_pkey, attr_str);
178 
179  if (0 == matches)
180  {
182  _ ("Unable to parse ATTR record string `%s'\n"),
183  s);
184  GNUNET_free (tmp_str);
185  return GNUNET_SYSERR;
186  }
187 
188  entries++;
189  token = strtok (NULL, ",");
190  }
191  GNUNET_free (tmp_str);
192 
193  tmp_str = GNUNET_strdup (s);
194  token = strtok (tmp_str, ",");
195  if (NULL == token)
196  {
197  GNUNET_free (tmp_str);
198  GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Malformed string %s\n", s);
199  return GNUNET_SYSERR;
200  }
201 
202  struct GNUNET_ABD_DelegationSet set[entries];
203  // sets memory to be 0, starting at *set for the size of struct * entries
204  memset (set, 0, sizeof (struct GNUNET_ABD_DelegationSet) * entries);
205  for (i = 0; i < entries; i++)
206  {
207  matches = sscanf (token, "%s %s", subject_pkey, attr_str);
208 
209  // sets the public key for the set entry
210  if (GNUNET_SYSERR ==
212  &set[i].subject_key))
213  {
214  GNUNET_free (tmp_str);
215  return GNUNET_SYSERR;
216  }
217 
218  // If not just key, also set subject attribute (Not A.a <- B but A.a <- B.b)
219  if (2 == matches)
220  {
221  set[i].subject_attribute_len = strlen (attr_str) + 1;
222  set[i].subject_attribute = GNUNET_strdup (attr_str);
223  }
224  // If more entries, then token string can take the next entry (separated by ',') by calling strtok again
225  token = strtok (NULL, ",");
226  }
227  tmp_data_size = GNUNET_ABD_delegation_set_get_size (entries, set);
228 
229  if (-1 == tmp_data_size)
230  {
231  GNUNET_free (tmp_str);
232  return GNUNET_SYSERR;
233  }
234  *data_size += tmp_data_size;
235  *data = sets = GNUNET_malloc (*data_size);
237  set,
238  tmp_data_size,
239  (char *) &sets[1]);
240  for (i = 0; i < entries; i++)
241  {
242  if (0 != set[i].subject_attribute_len)
243  {
244  GNUNET_free_nz ((char *) set[i].subject_attribute);
245  set[i].subject_attribute = NULL;
246  }
247  }
248  sets->set_count = htonl (entries);
249  sets->data_size = GNUNET_htonll (tmp_data_size);
250 
251  GNUNET_free (tmp_str);
252  return GNUNET_OK;
253  }
255  {
256  struct GNUNET_ABD_Delegate *cred;
258 
259  *data_size = GNUNET_ABD_delegate_serialize (cred, (char **) data);
260  GNUNET_free (cred);
261  return GNUNET_OK;
262  }
263  default:
264  return GNUNET_SYSERR;
265  }
266 }
267 
268 
273 static struct
274 {
275  const char *name;
276  uint32_t number;
279  {NULL, UINT32_MAX}};
280 
281 
289 static uint32_t
290 abd_typename_to_number (void *cls, const char *gns_typename)
291 {
292  unsigned int i;
293 
294  i = 0;
295  while ((name_map[i].name != NULL) &&
296  (0 != strcasecmp (gns_typename, name_map[i].name)))
297  i++;
298  return name_map[i].number;
299 }
300 
301 
309 static const char *
310 abd_number_to_typename (void *cls, uint32_t type)
311 {
312  unsigned int i;
313 
314  i = 0;
315  while ((name_map[i].name != NULL) && (type != name_map[i].number))
316  i++;
317  return name_map[i].name;
318 }
319 
320 
327 void *
329 {
331 
337  return api;
338 }
339 
340 
347 void *
349 {
351 
352  GNUNET_free (api);
353  return NULL;
354 }
355 
356 
357 /* end of plugin_gnsrecord_abd.c */
size_t GNUNET_ABD_delegation_set_get_size(unsigned int ds_count, const struct GNUNET_ABD_DelegationSet *dsr)
Calculate how many bytes we will need to serialize the given delegation chain.
int GNUNET_ABD_delegate_serialize(struct GNUNET_ABD_Delegate *dele, char **data)
struct GNUNET_ABD_Delegate * GNUNET_ABD_delegate_deserialize(const char *data, size_t data_size)
int GNUNET_ABD_delegation_set_deserialize(size_t len, const char *src, unsigned int d_count, struct GNUNET_ABD_DelegationSet *dsr)
Deserialize the given destination.
ssize_t GNUNET_ABD_delegation_set_serialize(unsigned int d_count, const struct GNUNET_ABD_DelegationSet *dsr, size_t dest_size, char *dest)
Serizalize the given delegation chain entries and abd.
API to serialize and deserialize delegation chains and abds.
char * GNUNET_ABD_delegate_to_string(const struct GNUNET_ABD_Delegate *cred)
Definition: delegate_misc.c:37
struct GNUNET_ABD_Delegate * GNUNET_ABD_delegate_from_string(const char *s)
Definition: delegate_misc.c:80
Delegate helper functions.
#define GNUNET_GNSRECORD_TYPE_ATTRIBUTE
For ABD reverse lookups.
#define GNUNET_GNSRECORD_TYPE_DELEGATE
For ABD policies.
struct GNUNET_IDENTITY_PublicKey subject_pkey
Subject key.
Definition: gnunet-abd.c:101
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
uint32_t data
The data value.
API that can be used to manipulate GNS record data.
Plugin API for GNS record types.
enum GNUNET_GenericReturnValue GNUNET_IDENTITY_public_key_from_string(const char *str, struct GNUNET_IDENTITY_PublicKey *key)
Parses a (Base32) string representation of the public key.
char * GNUNET_IDENTITY_public_key_to_string(const struct GNUNET_IDENTITY_PublicKey *key)
Creates a (Base32) string representation of the public key.
#define GNUNET_log(kind,...)
uint64_t GNUNET_ntohll(uint64_t n)
Convert unsigned 64-bit integer to host byte order.
Definition: common_endian.c:53
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.
@ GNUNET_OK
Definition: gnunet_common.h:99
@ GNUNET_SYSERR
Definition: gnunet_common.h:97
@ GNUNET_ERROR_TYPE_ERROR
int int GNUNET_asprintf(char **buf, const char *format,...) __attribute__((format(printf
Like asprintf, just portable.
#define GNUNET_strdup(a)
Wrapper around GNUNET_xstrdup_.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
#define GNUNET_malloc(size)
Wrapper around malloc.
#define GNUNET_free(ptr)
Wrapper around free.
#define GNUNET_free_nz(ptr)
Wrapper around free.
dictionary matches
#define _(String)
GNU gettext support macro.
Definition: platform.h:177
static int abd_string_to_value(void *cls, uint32_t type, const char *s, void **data, size_t *data_size)
Convert human-readable version of a 'value' of a record to the binary representation.
void * libgnunet_plugin_gnsrecord_abd_init(void *cls)
Entry point for the plugin.
void * libgnunet_plugin_gnsrecord_abd_done(void *cls)
Exit point from the plugin.
const char * name
static char * abd_value_to_string(void *cls, uint32_t type, const void *data, size_t data_size)
Convert the 'value' of a record to a string.
static const char * abd_number_to_typename(void *cls, uint32_t type)
Convert a type number to the corresponding type string (e.g.
uint32_t number
static struct @0 name_map[]
Mapping of record type numbers to human-readable record type names.
static uint32_t abd_typename_to_number(void *cls, const char *gns_typename)
Convert a type name (e.g.
The attribute delegation record.
uint64_t data_size
Length of delegation sets.
uint32_t set_count
Number of delegation sets in this record.
The attribute delegation record.
const char * subject_attribute
The subject attribute.
struct GNUNET_IDENTITY_PublicKey subject_key
Public key of the subject this attribute was delegated to.
Each plugin is required to return a pointer to a struct of this type as the return value from its ent...
GNUNET_GNSRECORD_TypenameToNumberFunction typename_to_number
Typename to number.
GNUNET_GNSRECORD_NumberToTypenameFunction number_to_typename
Number to typename.
GNUNET_GNSRECORD_ValueToStringFunction value_to_string
Conversion to string.
void * cls
Closure for all of the callbacks.
GNUNET_GNSRECORD_StringToValueFunction string_to_value
Conversion to binary.
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model
struct ListEntry * entries
List of peers in the list.