diff options
Diffstat (limited to 'src/identity-attribute/identity_attribute.c')
| -rw-r--r-- | src/identity-attribute/identity_attribute.c | 421 |
1 files changed, 421 insertions, 0 deletions
diff --git a/src/identity-attribute/identity_attribute.c b/src/identity-attribute/identity_attribute.c new file mode 100644 index 0000000000..a8aae6ced7 --- /dev/null +++ b/src/identity-attribute/identity_attribute.c @@ -0,0 +1,421 @@ +/* + This file is part of GNUnet + Copyright (C) 2010-2015 GNUnet e.V. + + GNUnet is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 3, or (at your + option) any later version. + + GNUnet is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with GNUnet; see the file COPYING. If not, write to the + Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. + */ + +/** + * @file identity-provider/identity_attribute.c + * @brief helper library to manage identity attributes + * @author Martin Schanzenbach + */ +#include "platform.h" +#include "gnunet_util_lib.h" +#include "identity_attribute.h" +#include "gnunet_identity_attribute_plugin.h" + +/** + * Handle for a plugin + */ +struct Plugin +{ + /** + * Name of the plugin + */ + char *library_name; + + /** + * Plugin API + */ + struct GNUNET_IDENTITY_ATTRIBUTE_PluginFunctions *api; +}; + +/** + * Plugins + */ +static struct Plugin **attr_plugins; + +/** + * Number of plugins + */ +static unsigned int num_plugins; + +/** + * Init canary + */ +static int initialized; + +/** + * Add a plugin + */ +static void +add_plugin (void* cls, + const char *library_name, + void *lib_ret) +{ + struct GNUNET_IDENTITY_ATTRIBUTE_PluginFunctions *api = lib_ret; + struct Plugin *plugin; + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Loading attribute plugin `%s'\n", + library_name); + plugin = GNUNET_new (struct Plugin); + plugin->api = api; + plugin->library_name = GNUNET_strdup (library_name); + GNUNET_array_append (attr_plugins, num_plugins, plugin); +} + +/** + * Load plugins + */ +static void +init() +{ + if (GNUNET_YES == initialized) + return; + initialized = GNUNET_YES; + GNUNET_PLUGIN_load_all ("libgnunet_plugin_identity_attribute_", NULL, + &add_plugin, NULL); +} + +/** + * Convert a type name to the corresponding number + * + * @param typename name to convert + * @return corresponding number, UINT32_MAX on error + */ +uint32_t +GNUNET_IDENTITY_ATTRIBUTE_typename_to_number (const char *typename) +{ + unsigned int i; + struct Plugin *plugin; + uint32_t ret; + + init (); + for (i = 0; i < num_plugins; i++) + { + plugin = attr_plugins[i]; + if (UINT32_MAX != (ret = plugin->api->typename_to_number (plugin->api->cls, + typename))) + return ret; + } + return UINT32_MAX; +} + +/** + * Convert a type number to the corresponding type string + * + * @param type number of a type + * @return corresponding typestring, NULL on error + */ +const char* +GNUNET_IDENTITY_ATTRIBUTE_number_to_typename (uint32_t type) +{ + unsigned int i; + struct Plugin *plugin; + const char *ret; + + init (); + for (i = 0; i < num_plugins; i++) + { + plugin = attr_plugins[i]; + if (NULL != (ret = plugin->api->number_to_typename (plugin->api->cls, + type))) + return ret; + } + return NULL; +} + +/** + * Convert human-readable version of a 'claim' of an attribute to the binary + * representation + * + * @param type type of the claim + * @param s human-readable string + * @param data set to value in binary encoding (will be allocated) + * @param data_size set to number of bytes in @a data + * @return #GNUNET_OK on success + */ +int +GNUNET_IDENTITY_ATTRIBUTE_string_to_value (uint32_t type, + const char *s, + void **data, + size_t *data_size) +{ + unsigned int i; + struct Plugin *plugin; + + init (); + for (i = 0; i < num_plugins; i++) + { + plugin = attr_plugins[i]; + if (GNUNET_OK == plugin->api->string_to_value (plugin->api->cls, + type, + s, + data, + data_size)) + return GNUNET_OK; + } + return GNUNET_SYSERR; +} + +/** + * Convert the 'claim' of an attribute to a string + * + * @param type the type of attribute + * @param data claim in binary encoding + * @param data_size number of bytes in @a data + * @return NULL on error, otherwise human-readable representation of the claim + */ +char * +GNUNET_IDENTITY_ATTRIBUTE_value_to_string (uint32_t type, + const void* data, + size_t data_size) +{ + unsigned int i; + struct Plugin *plugin; + char *ret; + + init(); + for (i = 0; i < num_plugins; i++) + { + plugin = attr_plugins[i]; + if (NULL != (ret = plugin->api->value_to_string (plugin->api->cls, + type, + data, + data_size))) + return ret; + } + return NULL; +} + +/** + * Create a new attribute. + * + * @param name the attribute name + * @param type the attribute type + * @param data the attribute value + * @param data_size the attribute value size + * @return the new attribute + */ +struct GNUNET_IDENTITY_ATTRIBUTE_Claim * +GNUNET_IDENTITY_ATTRIBUTE_claim_new (const char* attr_name, + uint32_t attr_type, + const void* data, + size_t data_size) +{ + struct GNUNET_IDENTITY_ATTRIBUTE_Claim *attr; + char *write_ptr; + + attr = GNUNET_malloc (sizeof (struct GNUNET_IDENTITY_ATTRIBUTE_Claim) + + strlen (attr_name) + 1 + + data_size); + attr->type = attr_type; + attr->data_size = data_size; + attr->version = 0; + write_ptr = (char*)&attr[1]; + GNUNET_memcpy (write_ptr, + attr_name, + strlen (attr_name) + 1); + attr->name = write_ptr; + write_ptr += strlen (attr->name) + 1; + GNUNET_memcpy (write_ptr, + data, + data_size); + attr->data = write_ptr; + return attr; +} + +size_t +GNUNET_IDENTITY_ATTRIBUTE_list_serialize_get_size (const struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList *attrs) +{ + struct GNUNET_IDENTITY_ATTRIBUTE_ClaimListEntry *le; + size_t len = 0; + for (le = attrs->list_head; NULL != le; le = le->next) + len += GNUNET_IDENTITY_ATTRIBUTE_serialize_get_size (le->claim); + return len; +} + +size_t +GNUNET_IDENTITY_ATTRIBUTE_list_serialize (const struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList *attrs, + char *result) +{ + struct GNUNET_IDENTITY_ATTRIBUTE_ClaimListEntry *le; + size_t len; + size_t total_len; + char* write_ptr; + + write_ptr = result; + total_len = 0; + for (le = attrs->list_head; NULL != le; le = le->next) + { + len = GNUNET_IDENTITY_ATTRIBUTE_serialize (le->claim, + write_ptr); + total_len += len; + write_ptr += len; + } + return total_len; +} + +struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList * +GNUNET_IDENTITY_ATTRIBUTE_list_deserialize (const char* data, + size_t data_size) +{ + struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList *attrs; + struct GNUNET_IDENTITY_ATTRIBUTE_ClaimListEntry *le; + size_t attr_len; + const char* read_ptr; + + if (data_size < sizeof (struct Attribute)) + return NULL; + + attrs = GNUNET_new (struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList); + read_ptr = data; + while (((data + data_size) - read_ptr) >= sizeof (struct Attribute)) + { + + le = GNUNET_new (struct GNUNET_IDENTITY_ATTRIBUTE_ClaimListEntry); + le->claim = GNUNET_IDENTITY_ATTRIBUTE_deserialize (read_ptr, + data_size - (read_ptr - data)); + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, + "Deserialized attribute %s\n", le->claim->name); + GNUNET_CONTAINER_DLL_insert (attrs->list_head, + attrs->list_tail, + le); + attr_len = GNUNET_IDENTITY_ATTRIBUTE_serialize_get_size (le->claim); + read_ptr += attr_len; + } + return attrs; +} + +struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList* +GNUNET_IDENTITY_ATTRIBUTE_list_dup (const struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList *attrs) +{ + struct GNUNET_IDENTITY_ATTRIBUTE_ClaimListEntry *le; + struct GNUNET_IDENTITY_ATTRIBUTE_ClaimListEntry *result_le; + struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList *result; + size_t len; + + result = GNUNET_new (struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList); + for (le = attrs->list_head; NULL != le; le = le->next) + { + result_le = GNUNET_new (struct GNUNET_IDENTITY_ATTRIBUTE_ClaimListEntry); + len = sizeof (struct GNUNET_IDENTITY_ATTRIBUTE_Claim) + le->claim->data_size; + result_le->claim = GNUNET_malloc (len); + GNUNET_memcpy (result_le->claim, + le->claim, + len); + result_le->claim->name = (const char*)&result_le->claim[1]; + GNUNET_CONTAINER_DLL_insert (result->list_head, + result->list_tail, + result_le); + } + return result; +} + + +void +GNUNET_IDENTITY_ATTRIBUTE_list_destroy (struct GNUNET_IDENTITY_ATTRIBUTE_ClaimList *attrs) +{ + struct GNUNET_IDENTITY_ATTRIBUTE_ClaimListEntry *le; + struct GNUNET_IDENTITY_ATTRIBUTE_ClaimListEntry *tmp_le; + + for (le = attrs->list_head; NULL != le;) + { + GNUNET_free (le->claim); + tmp_le = le; + le = le->next; + GNUNET_free (tmp_le); + } + GNUNET_free (attrs); + +} + +size_t +GNUNET_IDENTITY_ATTRIBUTE_serialize_get_size (const struct GNUNET_IDENTITY_ATTRIBUTE_Claim *attr) +{ + return sizeof (struct Attribute) + + strlen (attr->name) + + attr->data_size; +} + +size_t +GNUNET_IDENTITY_ATTRIBUTE_serialize (const struct GNUNET_IDENTITY_ATTRIBUTE_Claim *attr, + char *result) +{ + size_t data_len_ser; + size_t name_len; + struct Attribute *attr_ser; + char* write_ptr; + + attr_ser = (struct Attribute*)result; + attr_ser->attribute_type = htons (attr->type); + attr_ser->attribute_version = htonl (attr->version); + name_len = strlen (attr->name); + attr_ser->name_len = htons (name_len); + write_ptr = (char*)&attr_ser[1]; + GNUNET_memcpy (write_ptr, attr->name, name_len); + write_ptr += name_len; + //TODO plugin-ize + //data_len_ser = plugin->serialize_attribute_value (attr, + // &attr_ser[1]); + data_len_ser = attr->data_size; + GNUNET_memcpy (write_ptr, attr->data, attr->data_size); + attr_ser->data_size = htons (data_len_ser); + + return sizeof (struct Attribute) + strlen (attr->name) + attr->data_size; +} + +struct GNUNET_IDENTITY_ATTRIBUTE_Claim * +GNUNET_IDENTITY_ATTRIBUTE_deserialize (const char* data, + size_t data_size) +{ + struct GNUNET_IDENTITY_ATTRIBUTE_Claim *attr; + struct Attribute *attr_ser; + size_t data_len; + size_t name_len; + char* write_ptr; + + if (data_size < sizeof (struct Attribute)) + return NULL; + + attr_ser = (struct Attribute*)data; + data_len = ntohs (attr_ser->data_size); + name_len = ntohs (attr_ser->name_len); + attr = GNUNET_malloc (sizeof (struct GNUNET_IDENTITY_ATTRIBUTE_Claim) + + data_len + name_len + 1); + attr->type = ntohs (attr_ser->attribute_type); + attr->version = ntohl (attr_ser->attribute_version); + attr->data_size = ntohs (attr_ser->data_size); + + write_ptr = (char*)&attr[1]; + GNUNET_memcpy (write_ptr, + &attr_ser[1], + name_len); + write_ptr[name_len] = '\0'; + attr->name = write_ptr; + + write_ptr += name_len + 1; + GNUNET_memcpy (write_ptr, + (char*)&attr_ser[1] + name_len, + attr->data_size); + attr->data = write_ptr; + return attr; + +} + +/* end of identity_attribute.c */ |