plugin_gnsrecord_conversation.c File Reference

gnsrecord plugin to provide the API for fundamental GNS records This includes the VPN record because GNS resolution is expected to understand VPN records and (if needed) map the result to A/AAAA. More...

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_gnsrecord_lib.h"
#include "gnunet_conversation_service.h"
#include "gnunet_gnsrecord_plugin.h"

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Functions
static char *	conversation_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	conversation_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	conversation_typename_to_number (void *cls, const char *gns_typename)
	Convert a type name (e.g. More...
static const char *	conversation_number_to_typename (void *cls, uint32_t type)
	Convert a type number to the corresponding type string (e.g. More...
void *	libgnunet_plugin_gnsrecord_conversation_init (void *cls)
	Entry point for the plugin. More...
void *	libgnunet_plugin_gnsrecord_conversation_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 fundamental GNS records This includes the VPN record because GNS resolution is expected to understand VPN records and (if needed) map the result to A/AAAA.

Author

Christian Grothoff

Definition in file plugin_gnsrecord_conversation.c.

Function Documentation

conversation_value_to_string()

static char * conversation_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 47 of file plugin_gnsrecord_conversation.c.

{
  char *s;
 
  (void) cls;
  switch (type)
  {
  case GNUNET_GNSRECORD_TYPE_PHONE:
    {
      const struct GNUNET_CONVERSATION_PhoneRecord *pr;
      char *ret;
      char *pkey;
 
      if (data_size != sizeof(struct GNUNET_CONVERSATION_PhoneRecord))
      {
        GNUNET_break_op (0);
        return NULL;
      }
      pr = data;
      if (1 != ntohl (pr->version))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    _ ("PHONE version %u not supported\n"),
                    ntohl (pr->version));
        return NULL;
      }
      pkey = GNUNET_CRYPTO_eddsa_public_key_to_string (&pr->peer.public_key);
      s = GNUNET_STRINGS_data_to_string_alloc (&pr->line_port,
                                               sizeof(struct GNUNET_HashCode));
 
      GNUNET_asprintf (&ret,
                       "%s-%s",
                       s,
                       pkey);
      GNUNET_free (s);
      GNUNET_free (pkey);
      return ret;
    }
 
  default:
    return NULL;
  }
}

References _, data, data_size, GNUNET_asprintf(), GNUNET_break_op, GNUNET_CRYPTO_eddsa_public_key_to_string(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_GNSRECORD_TYPE_PHONE, GNUNET_log, GNUNET_STRINGS_data_to_string_alloc(), GNUNET_CONVERSATION_PhoneRecord::line_port, GNUNET_CONVERSATION_PhoneRecord::peer, pkey, GNUNET_PeerIdentity::public_key, ret, type, and GNUNET_CONVERSATION_PhoneRecord::version.

Referenced by libgnunet_plugin_gnsrecord_conversation_init().

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conversation_string_to_value()

static int conversation_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 107 of file plugin_gnsrecord_conversation.c.

{
  (void) cls;
  if (NULL == s)
  {
    GNUNET_break (0);
    return GNUNET_SYSERR;
  }
  switch (type)
  {
  case GNUNET_GNSRECORD_TYPE_PHONE:
    {
      struct GNUNET_CONVERSATION_PhoneRecord *pr;
      char line_port[104];
      const char *dash;
      struct GNUNET_PeerIdentity peer;
 
      if ((NULL == (dash = strchr (s, '-'))) ||
          (1 != sscanf (s, "%103s-", line_port)) ||
          (GNUNET_OK !=
           GNUNET_CRYPTO_eddsa_public_key_from_string (dash + 1,
                                                       strlen (dash + 1),
                                                       &peer.public_key)))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    _ ("Unable to parse PHONE record `%s'\n"),
                    s);
        return GNUNET_SYSERR;
      }
      pr = GNUNET_new (struct GNUNET_CONVERSATION_PhoneRecord);
      pr->version = htonl (1);
      pr->reserved = htonl (0);
      if (GNUNET_OK !=
          GNUNET_STRINGS_string_to_data (line_port,
                                         strlen (line_port),
                                         &pr->line_port,
                                         sizeof(struct GNUNET_HashCode)))
      {
        GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
                    _ ("Unable to parse PHONE record `%s'\n"),
                    s);
        GNUNET_free (pr);
        return GNUNET_SYSERR;
      }
      pr->peer = peer;
      *data = pr;
      *data_size = sizeof(struct GNUNET_CONVERSATION_PhoneRecord);
      return GNUNET_OK;
    }
 
  default:
    return GNUNET_SYSERR;
  }
}

References _, data, data_size, GNUNET_break, GNUNET_CRYPTO_eddsa_public_key_from_string(), GNUNET_ERROR_TYPE_ERROR, GNUNET_free, GNUNET_GNSRECORD_TYPE_PHONE, GNUNET_log, GNUNET_new, GNUNET_OK, GNUNET_STRINGS_string_to_data(), GNUNET_SYSERR, GNUNET_CONVERSATION_PhoneRecord::line_port, GNUNET_CONVERSATION_PhoneRecord::peer, GNUNET_PeerIdentity::public_key, GNUNET_CONVERSATION_PhoneRecord::reserved, type, and GNUNET_CONVERSATION_PhoneRecord::version.

Referenced by libgnunet_plugin_gnsrecord_conversation_init().

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conversation_typename_to_number()

static uint32_t conversation_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 189 of file plugin_gnsrecord_conversation.c.

{
  unsigned int i;
 
  (void) cls;
  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_conversation_init().

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conversation_number_to_typename()

static const char * conversation_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 211 of file plugin_gnsrecord_conversation.c.

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

References name, name_map, and type.

Referenced by libgnunet_plugin_gnsrecord_conversation_init().

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libgnunet_plugin_gnsrecord_conversation_init()

void * libgnunet_plugin_gnsrecord_conversation_init

(

void *

cls

)

Entry point for the plugin.

Parameters

cls

NULL

Returns

the exported block API

Definition at line 232 of file plugin_gnsrecord_conversation.c.

{
  struct GNUNET_GNSRECORD_PluginFunctions *api;
 
  (void) cls;
  api = GNUNET_new (struct GNUNET_GNSRECORD_PluginFunctions);
  api->value_to_string = &conversation_value_to_string;
  api->string_to_value = &conversation_string_to_value;
  api->typename_to_number = &conversation_typename_to_number;
  api->number_to_typename = &conversation_number_to_typename;
  return api;
}

References GNUNET_GNSRECORD_PluginFunctions::cls, conversation_number_to_typename(), conversation_string_to_value(), conversation_typename_to_number(), conversation_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_conversation_done()

void * libgnunet_plugin_gnsrecord_conversation_done

(

void *

cls

)

Exit point from the plugin.

Parameters

cls	the return value from libgnunet_plugin_block_test_init

Returns

NULL

Definition at line 253 of file plugin_gnsrecord_conversation.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 173 of file plugin_gnsrecord_conversation.c.

Referenced by conversation_number_to_typename(), and conversation_typename_to_number().

number

uint32_t number

Definition at line 174 of file plugin_gnsrecord_conversation.c.

struct { ... } name_map[]

Initial value:

= {
  { "PHONE", GNUNET_GNSRECORD_TYPE_PHONE },
  { NULL, UINT32_MAX }
}

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

Referenced by conversation_number_to_typename(), and conversation_typename_to_number().