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22 * @file credential/plugin_gnsrecord_credential.c
23 * @brief gnsrecord plugin to provide the API for CREDENTIAL records
24 * @author Adnan Husain
28 #include "gnunet_util_lib.h"
29 #include "gnunet_gnsrecord_lib.h"
30 #include "gnunet_credential_service.h"
31 #include "gnunet_gnsrecord_plugin.h"
35 * Convert the 'value' of a record to a string.
37 * @param cls closure, unused
38 * @param type type of the record
39 * @param data value in binary encoding
40 * @param data_size number of bytes in @a data
41 * @return NULL on error, otherwise human-readable representation of the value
44 credential_value_to_string (void *cls,
54 case GNUNET_GNSRECORD_TYPE_ATTRIBUTE:
56 struct GNUNET_CREDENTIAL_AttributeRecordData attr;
60 if (data_size < sizeof (struct GNUNET_CREDENTIAL_AttributeRecordData))
61 return NULL; /* malformed */
66 subject_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&attr.subject_key);
67 GNUNET_asprintf (&attr_str,
70 &cdata[sizeof (attr)]);
71 GNUNET_free (subject_pkey);
74 case GNUNET_GNSRECORD_TYPE_CREDENTIAL:
76 struct GNUNET_CREDENTIAL_CredentialRecordData cred;
77 struct GNUNET_TIME_Absolute etime_abs;
82 const char *expiration;
85 if (data_size < sizeof (struct GNUNET_CREDENTIAL_CredentialRecordData))
86 return NULL; /* malformed */
91 subject_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred.subject_key);
92 issuer_pkey = GNUNET_CRYPTO_ecdsa_public_key_to_string (&cred.issuer_key);
93 etime_abs.abs_value_us = GNUNET_ntohll(cred.expiration);
94 expiration = GNUNET_STRINGS_absolute_time_to_string (etime_abs);
95 GNUNET_STRINGS_base64_encode ((char*)&cred.sig,
96 sizeof (struct GNUNET_CRYPTO_EcdsaSignature),
98 GNUNET_asprintf (&cred_str,
99 "%s.%s -> %s exp:%s sig:%s",
101 &cdata[sizeof (cred)],
105 GNUNET_free (subject_pkey);
106 GNUNET_free (issuer_pkey);
107 GNUNET_free (signature);
117 * Convert human-readable version of a 'value' of a record to the binary
120 * @param cls closure, unused
121 * @param type type of the record
122 * @param s human-readable string
123 * @param data set to value in binary encoding (will be allocated)
124 * @param data_size set to number of bytes in @a data
125 * @return #GNUNET_OK on success
128 credential_string_to_value (void *cls,
135 return GNUNET_SYSERR;
138 case GNUNET_GNSRECORD_TYPE_CREDENTIAL:
140 struct GNUNET_CREDENTIAL_CredentialRecordData *cred;
142 size_t enclen = (sizeof (struct GNUNET_CRYPTO_EcdsaPublicKey)) * 8;
144 enclen += 5 - enclen % 5;
145 enclen /= 5; /* 260/5 = 52 */
146 char subject_pkey[enclen + 1];
147 char issuer_pkey[enclen + 1];
149 char signature[128]; //TODO max payload size
150 char expiration[256];
152 struct GNUNET_CRYPTO_EcdsaSignature *sig;
153 struct GNUNET_TIME_Absolute etime_abs;
156 "%52s.%253s -> %52s exp:%255s sig:%127s",
163 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
164 _("Unable to parse CRED record string `%s'\n"),
166 return GNUNET_SYSERR;
168 *data_size = sizeof (struct GNUNET_CREDENTIAL_CredentialRecordData) + strlen (name) + 1;
169 *data = cred = GNUNET_malloc (*data_size);
170 GNUNET_CRYPTO_ecdsa_public_key_from_string (subject_pkey,
171 strlen (subject_pkey),
173 GNUNET_CRYPTO_ecdsa_public_key_from_string (issuer_pkey,
174 strlen (issuer_pkey),
176 GNUNET_STRINGS_fancy_time_to_absolute (expiration,
178 GNUNET_STRINGS_base64_decode (signature,
182 cred->expiration = htonl (etime_abs.abs_value_us);
184 GNUNET_memcpy (&cred[1],
189 *data = GNUNET_strdup (s);
190 *data_size = strlen (s);
194 return GNUNET_SYSERR;
200 * Mapping of record type numbers to human-readable
207 { "CRED", GNUNET_GNSRECORD_TYPE_CREDENTIAL },
213 * Convert a type name (i.e. "AAAA") to the corresponding number.
215 * @param cls closure, unused
216 * @param gns_typename name to convert
217 * @return corresponding number, UINT32_MAX on error
220 credential_typename_to_number (void *cls,
221 const char *gns_typename)
226 while ( (name_map[i].name != NULL) &&
227 (0 != strcasecmp (gns_typename, name_map[i].name)) )
229 return name_map[i].number;
234 * Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
236 * @param cls closure, unused
237 * @param type number of a type to convert
238 * @return corresponding typestring, NULL on error
241 credential_number_to_typename (void *cls,
247 while ( (name_map[i].name != NULL) &&
248 (type != name_map[i].number) )
250 return name_map[i].name;
255 * Entry point for the plugin.
258 * @return the exported block API
261 libgnunet_plugin_gnsrecord_credential_init (void *cls)
263 struct GNUNET_GNSRECORD_PluginFunctions *api;
265 api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
266 api->value_to_string = &credential_value_to_string;
267 api->string_to_value = &credential_string_to_value;
268 api->typename_to_number = &credential_typename_to_number;
269 api->number_to_typename = &credential_number_to_typename;
275 * Exit point from the plugin.
277 * @param cls the return value from #libgnunet_plugin_block_test_init
281 libgnunet_plugin_gnsrecord_credential_done (void *cls)
283 struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
289 /* end of plugin_gnsrecord_credential.c */