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 000000000..cf50d058e
--- /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-attribute/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 attr_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 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 = 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 */