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- /*
- This file is part of GNUnet
- (C) 2013 Christian Grothoff (and other contributing authors)
- 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., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
- */
- /**
- * @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)
- {
- 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))
- return NULL;
- pr = data;
- if (0 != ntohl (pr->version))
- return NULL;
- pkey = GNUNET_CRYPTO_eddsa_public_key_to_string (&pr->peer.public_key);
- GNUNET_asprintf (&ret,
- "%u-%s",
- ntohl (pr->line),
- pkey);
- 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)
- {
- if (NULL == s)
- return GNUNET_SYSERR;
- switch (type)
- {
- case GNUNET_GNSRECORD_TYPE_PHONE:
- {
- struct GNUNET_CONVERSATION_PhoneRecord *pr;
- unsigned int line;
- const char *dash;
- struct GNUNET_PeerIdentity peer;
- if ( (NULL == (dash = strchr (s, '-'))) ||
- (1 != sscanf (s, "%u-", &line)) ||
- (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 (0);
- pr->line = htonl ((uint32_t) line);
- 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;
- 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;
- 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;
- 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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