plugin_gnsrecord_abd.c File Reference

gnsrecord plugin to provide the API for ABD records More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "delegate_misc.h"
#include "abd_serialization.h"
#include "gnunet_abd_service.h"
#include "gnunet_gnsrecord_lib.h"
#include "gnunet_gnsrecord_plugin.h"
#include "gnunet_signatures.h"

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Functions
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. More...
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. More...
static uint32_t	abd_typename_to_number (void *cls, const char *gns_typename)
	Convert a type name (e.g. More...
static const char *	abd_number_to_typename (void *cls, uint32_t type)
	Convert a type number to the corresponding type string (e.g. More...
void *	libgnunet_plugin_gnsrecord_abd_init (void *cls)
	Entry point for the plugin. More...
void *	libgnunet_plugin_gnsrecord_abd_done (void *cls)
	Exit point from the plugin. More...

Variables
struct {
const char *   name
uint32_t   number
}	name_map []
	Mapping of record type numbers to human-readable record type names. More...

Detailed Description

gnsrecord plugin to provide the API for ABD records

Author

Martin Schanzenbach

Definition in file plugin_gnsrecord_abd.c.

Function Documentation

abd_value_to_string()

static char * abd_value_to_string ( void *  cls, uint32_t  type, const void *  data, size_t  data_size  )

static

Convert the 'value' of a record to a string.

Parameters

cls	closure, unused
type	type of the record
data	value in binary encoding
data_size	number of bytes in data

Returns

NULL on error, otherwise human-readable representation of the value

Definition at line 46 of file plugin_gnsrecord_abd.c.

{
  const char *cdata;
 
  switch (type)
  {
  case GNUNET_GNSRECORD_TYPE_ATTRIBUTE:
    {
      struct GNUNET_ABD_DelegationRecord sets;
      char *attr_str;
      char *subject_pkey;
      char *tmp_str;
      int i;
      if (data_size < sizeof (struct GNUNET_ABD_DelegationRecord))
        return NULL; /* malformed */
 
      GNUNET_memcpy (&sets, data, sizeof (sets));
      cdata = data;
 
      struct GNUNET_ABD_DelegationSet set[ntohl (sets.set_count)];
      if (GNUNET_OK !=
          GNUNET_ABD_delegation_set_deserialize (GNUNET_ntohll (
                                                   sets.data_size),
                                                 &cdata[sizeof (sets)],
                                                 ntohl (sets.set_count),
                                                 set))
        return NULL;
 
      for (i = 0; i < ntohl (sets.set_count); i++)
      {
        subject_pkey =
          GNUNET_CRYPTO_public_key_to_string (&set[i].subject_key);
 
        if (0 == set[i].subject_attribute_len)
        {
          if (0 == i)
          {
            GNUNET_asprintf (&attr_str, "%s", subject_pkey);
          }
          else
          {
            GNUNET_asprintf (&tmp_str, "%s,%s", attr_str, subject_pkey);
            GNUNET_free (attr_str);
            attr_str = tmp_str;
          }
        }
        else
        {
          if (0 == i)
          {
            GNUNET_asprintf (&attr_str,
                             "%s %s",
                             subject_pkey,
                             set[i].subject_attribute);
          }
          else
          {
            GNUNET_asprintf (&tmp_str,
                             "%s,%s %s",
                             attr_str,
                             subject_pkey,
                             set[i].subject_attribute);
            GNUNET_free (attr_str);
            attr_str = tmp_str;
          }
        }
        GNUNET_free (subject_pkey);
      }
      return attr_str;
    }
  case GNUNET_GNSRECORD_TYPE_DELEGATE:
    {
      struct GNUNET_ABD_Delegate *cred;
      char *cred_str;
 
      cred = GNUNET_ABD_delegate_deserialize (data, data_size);
      cred_str = GNUNET_ABD_delegate_to_string (cred);
      GNUNET_free (cred);
      return cred_str;
    }
  default:
    return NULL;
  }
}

References cred, data, data_size, GNUNET_ABD_DelegationRecord::data_size, GNUNET_ABD_delegate_deserialize(), GNUNET_ABD_delegate_to_string(), GNUNET_ABD_delegation_set_deserialize(), GNUNET_asprintf(), GNUNET_CRYPTO_public_key_to_string(), GNUNET_free, GNUNET_GNSRECORD_TYPE_ATTRIBUTE, GNUNET_GNSRECORD_TYPE_DELEGATE, GNUNET_memcpy, GNUNET_ntohll(), GNUNET_OK, GNUNET_ABD_DelegationRecord::set_count, GNUNET_ABD_DelegationSet::subject_attribute, GNUNET_ABD_DelegationSet::subject_attribute_len, GNUNET_ABD_DelegationSet::subject_key, subject_pkey, and type.

Referenced by libgnunet_plugin_gnsrecord_abd_init().

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abd_string_to_value()

static int abd_string_to_value ( void *  cls, uint32_t  type, const char *  s, void **  data, size_t *  data_size  )

static

Convert human-readable version of a 'value' of a record to the binary representation.

Parameters

cls	closure, unused
type	type of the record
s	human-readable string
data	set to value in binary encoding (will be allocated)
data_size	set to number of bytes in data

Returns

GNUNET_OK on success

Definition at line 147 of file plugin_gnsrecord_abd.c.

{
  if (NULL == s)
    return GNUNET_SYSERR;
  switch (type)
  {
  case GNUNET_GNSRECORD_TYPE_ATTRIBUTE:
    {
      struct GNUNET_ABD_DelegationRecord *sets;
      char attr_str[253 + 1];
      char subject_pkey[58 + 1];
      char *token;
      char *tmp_str;
      int matches = 0;
      int entries;
      size_t tmp_data_size;
      int i;
 
      tmp_str = GNUNET_strdup (s);
      token = strtok (tmp_str, ",");
      entries = 0;
      tmp_data_size = 0;
      *data_size = sizeof (struct GNUNET_ABD_DelegationRecord);
      while (NULL != token)
      {
        // also fills the variables subject_pley and attr_str if "regex"-like match
        matches = sscanf (token, "%s %s", subject_pkey, attr_str);
 
        if (0 == matches)
        {
          GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                      _ ("Unable to parse ATTR record string `%s'\n"),
                      s);
          GNUNET_free (tmp_str);
          return GNUNET_SYSERR;
        }
 
        entries++;
        token = strtok (NULL, ",");
      }
      GNUNET_free (tmp_str);
 
      tmp_str = GNUNET_strdup (s);
      token = strtok (tmp_str, ",");
      if (NULL == token)
      {
        GNUNET_free (tmp_str);
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Malformed string %s\n", s);
        return GNUNET_SYSERR;
      }
 
      struct GNUNET_ABD_DelegationSet set[entries];
      // sets memory to be 0, starting at *set for the size of struct * entries
      memset (set, 0, sizeof (struct GNUNET_ABD_DelegationSet) * entries);
      for (i = 0; i < entries; i++)
      {
        matches = sscanf (token, "%s %s", subject_pkey, attr_str);
 
        // sets the public key for the set entry
        if (GNUNET_SYSERR ==
            GNUNET_CRYPTO_public_key_from_string (subject_pkey,
                                                    &set[i].subject_key))
        {
          GNUNET_free (tmp_str);
          return GNUNET_SYSERR;
        }
 
        // If not just key, also set subject attribute (Not A.a <- B but A.a <- B.b)
        if (2 == matches)
        {
          set[i].subject_attribute_len = strlen (attr_str) + 1;
          set[i].subject_attribute = GNUNET_strdup (attr_str);
        }
        // If more entries, then token string can take the next entry (separated by ',') by calling strtok again
        token = strtok (NULL, ",");
      }
      tmp_data_size = GNUNET_ABD_delegation_set_get_size (entries, set);
 
      if (-1 == tmp_data_size)
      {
        GNUNET_free (tmp_str);
        return GNUNET_SYSERR;
      }
      *data_size += tmp_data_size;
      *data = sets = GNUNET_malloc (*data_size);
      GNUNET_ABD_delegation_set_serialize (entries,
                                           set,
                                           tmp_data_size,
                                           (char *) &sets[1]);
      for (i = 0; i < entries; i++)
      {
        if (0 != set[i].subject_attribute_len)
        {
          GNUNET_free_nz ((char *) set[i].subject_attribute);
          set[i].subject_attribute = NULL;
        }
      }
      sets->set_count = htonl (entries);
      sets->data_size = GNUNET_htonll (tmp_data_size);
 
      GNUNET_free (tmp_str);
      return GNUNET_OK;
    }
  case GNUNET_GNSRECORD_TYPE_DELEGATE:
    {
      struct GNUNET_ABD_Delegate *cred;
      cred = GNUNET_ABD_delegate_from_string (s);
 
      *data_size = GNUNET_ABD_delegate_serialize (cred, (char **) data);
      GNUNET_free (cred);
      return GNUNET_OK;
    }
  default:
    return GNUNET_SYSERR;
  }
}

References _, cred, data, data_size, GNUNET_ABD_DelegationRecord::data_size, GNUNET_ABD_delegate_from_string(), GNUNET_ABD_delegate_serialize(), GNUNET_ABD_delegation_set_get_size(), GNUNET_ABD_delegation_set_serialize(), GNUNET_CRYPTO_public_key_from_string(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_free_nz, GNUNET_GNSRECORD_TYPE_ATTRIBUTE, GNUNET_GNSRECORD_TYPE_DELEGATE, GNUNET_htonll(), GNUNET_log, GNUNET_malloc, GNUNET_OK, GNUNET_strdup, GNUNET_SYSERR, warningfilter::matches, GNUNET_ABD_DelegationRecord::set_count, GNUNET_ABD_DelegationSet::subject_attribute, GNUNET_ABD_DelegationSet::subject_attribute_len, GNUNET_ABD_DelegationSet::subject_key, subject_pkey, and type.

Referenced by libgnunet_plugin_gnsrecord_abd_init().

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abd_typename_to_number()

static uint32_t abd_typename_to_number ( void *  cls, const char *  gns_typename  )

static

Convert a type name (e.g.

"AAAA") to the corresponding number.

Parameters

cls	closure, unused
gns_typename	name to convert

Returns

corresponding number, UINT32_MAX on error

Definition at line 290 of file plugin_gnsrecord_abd.c.

{
  unsigned int i;
 
  i = 0;
  while ((name_map[i].name != NULL) &&
         (0 != strcasecmp (gns_typename, name_map[i].name)))
    i++;
  return name_map[i].number;
}

References name, and name_map.

Referenced by libgnunet_plugin_gnsrecord_abd_init().

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abd_number_to_typename()

static const char * abd_number_to_typename ( void *  cls, uint32_t  type  )

static

Convert a type number to the corresponding type string (e.g.

1 to "A")

Parameters

cls	closure, unused
type	number of a type to convert

Returns

corresponding typestring, NULL on error

Definition at line 310 of file plugin_gnsrecord_abd.c.

{
  unsigned int i;
 
  i = 0;
  while ((name_map[i].name != NULL) && (type != name_map[i].number))
    i++;
  return name_map[i].name;
}

References name, name_map, number, and type.

Referenced by libgnunet_plugin_gnsrecord_abd_init().

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libgnunet_plugin_gnsrecord_abd_init()

void * libgnunet_plugin_gnsrecord_abd_init

(

void *

cls

)

Entry point for the plugin.

Parameters

cls

NULL

Returns

the exported block API

Definition at line 328 of file plugin_gnsrecord_abd.c.

{
  struct GNUNET_GNSRECORD_PluginFunctions *api;
 
  api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
  api->value_to_string = &abd_value_to_string;
  api->string_to_value = &abd_string_to_value;
  api->typename_to_number = &abd_typename_to_number;
  api->number_to_typename = &abd_number_to_typename;
  return api;
}

References abd_number_to_typename(), abd_string_to_value(), abd_typename_to_number(), abd_value_to_string(), GNUNET_new, GNUNET_GNSRECORD_PluginFunctions::number_to_typename, GNUNET_GNSRECORD_PluginFunctions::string_to_value, GNUNET_GNSRECORD_PluginFunctions::typename_to_number, and GNUNET_GNSRECORD_PluginFunctions::value_to_string.

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libgnunet_plugin_gnsrecord_abd_done()

void * libgnunet_plugin_gnsrecord_abd_done

(

void *

cls

)

Exit point from the plugin.

Parameters

cls	the return value from libgnunet_plugin_block_test_init

Returns

NULL

Definition at line 348 of file plugin_gnsrecord_abd.c.

{
  struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
 
  GNUNET_free (api);
  return NULL;
}

References GNUNET_GNSRECORD_PluginFunctions::cls, and GNUNET_free.

Variable Documentation

name

const char* name

Definition at line 275 of file plugin_gnsrecord_abd.c.

Referenced by abd_number_to_typename(), and abd_typename_to_number().

number

uint32_t number

Definition at line 276 of file plugin_gnsrecord_abd.c.

Referenced by abd_number_to_typename(), decode_bytes(), encode_bytes(), GNUNET_CONFIGURATION_get_value_float(), GNUNET_CONFIGURATION_get_value_number(), GNUNET_CONFIGURATION_set_value_number(), GNUNET_GNS_protocol_number_to_name(), and least_square_root().

struct { ... } name_map[]

Initial value:

= {{"ATTR", GNUNET_GNSRECORD_TYPE_ATTRIBUTE},
                {"DEL", GNUNET_GNSRECORD_TYPE_DELEGATE},
                {NULL, UINT32_MAX}}

Mapping of record type numbers to human-readable record type names.

Referenced by abd_number_to_typename(), and abd_typename_to_number().