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/*
This file is part of GNUnet
Copyright (C) 2013 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
*/
/**
* @file conversation/plugin_gnsrecord_conversation.c
* @brief 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
*/
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_gnsrecord_lib.h"
#include "gnunet_conversation_service.h"
#include "gnunet_gnsrecord_plugin.h"
/**
* Convert the 'value' of a record to a string.
*
* @param cls closure, unused
* @param type type of the record
* @param data value in binary encoding
* @param data_size number of bytes in @a data
* @return NULL on error, otherwise human-readable representation of the value
*/
static char *
conversation_value_to_string (void *cls,
uint32_t type,
const void *data,
size_t data_size)
{
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;
}
}
/**
* Convert human-readable version of a 'value' of a record to the binary
* representation.
*
* @param cls closure, unused
* @param type type of the record
* @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
*/
static int
conversation_string_to_value (void *cls,
uint32_t type,
const char *s,
void **data,
size_t *data_size)
{
(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[103];
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;
}
}
/**
* Mapping of record type numbers to human-readable
* record type names.
*/
static struct {
const char *name;
uint32_t number;
} name_map[] = {
{ "PHONE", GNUNET_GNSRECORD_TYPE_PHONE },
{ NULL, UINT32_MAX }
};
/**
* Convert a type name (i.e. "AAAA") to the corresponding number.
*
* @param cls closure, unused
* @param gns_typename name to convert
* @return corresponding number, UINT32_MAX on error
*/
static uint32_t
conversation_typename_to_number (void *cls,
const char *gns_typename)
{
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;
}
/**
* Convert a type number (i.e. 1) to the corresponding type string (i.e. "A")
*
* @param cls closure, unused
* @param type number of a type to convert
* @return corresponding typestring, NULL on error
*/
static const char *
conversation_number_to_typename (void *cls,
uint32_t type)
{
unsigned int i;
(void) cls;
i=0;
while ( (name_map[i].name != NULL) &&
(type != name_map[i].number) )
i++;
return name_map[i].name;
}
/**
* Entry point for the plugin.
*
* @param cls NULL
* @return the exported block API
*/
void *
libgnunet_plugin_gnsrecord_conversation_init (void *cls)
{
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;
}
/**
* Exit point from the plugin.
*
* @param cls the return value from #libgnunet_plugin_block_test_init
* @return NULL
*/
void *
libgnunet_plugin_gnsrecord_conversation_done (void *cls)
{
struct GNUNET_GNSRECORD_PluginFunctions *api = cls;
GNUNET_free (api);
return NULL;
}
/* end of plugin_gnsrecord_conversation.c */
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