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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.
- You should have received a copy of the GNU Affero General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
- SPDX-License-Identifier: AGPL3.0-or-later
- */
- /**
- * @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 (e.g. "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 to the corresponding type string (e.g. 1 to "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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