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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 identity/identity_api_lookup.c
- * @brief api to lookup an ego
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_identity_service.h"
- #include "identity.h"
- #define LOG(kind, ...) GNUNET_log_from (kind, "identity-api", __VA_ARGS__)
- /**
- * Handle for ego lookup.
- */
- struct GNUNET_IDENTITY_EgoLookup
- {
- /**
- * Connection to service.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Name of the ego we are looking up.
- */
- char *name;
- /**
- * Function to call with the result.
- */
- GNUNET_IDENTITY_EgoCallback cb;
- /**
- * Closure for @e cb
- */
- void *cb_cls;
- };
- /**
- * We received a result code from the service. Check the message
- * is well-formed.
- *
- * @param cls closure
- * @param rcm result message received
- * @return #GNUNET_OK if the message is well-formed
- */
- static int
- check_identity_result_code (void *cls, const struct ResultCodeMessage *rcm)
- {
- if (sizeof (*rcm) != htons (rcm->header.size))
- GNUNET_MQ_check_zero_termination (rcm);
- return GNUNET_OK;
- }
- /**
- * We received a result code from the service.
- *
- * @param cls closure
- * @param rcm result message received
- */
- static void
- handle_identity_result_code (void *cls, const struct ResultCodeMessage *rcm)
- {
- struct GNUNET_IDENTITY_EgoLookup *el = cls;
- el->cb (el->cb_cls, NULL);
- GNUNET_IDENTITY_ego_lookup_cancel (el);
- }
- /**
- * Check validity of identity update message.
- *
- * @param cls closure
- * @param um message received
- * @return #GNUNET_OK if the message is well-formed
- */
- static int
- check_identity_update (void *cls, const struct UpdateMessage *um)
- {
- uint16_t size = ntohs (um->header.size);
- uint16_t name_len = ntohs (um->name_len);
- const char *str = (const char *) &um[1];
- if ((size != name_len + sizeof (struct UpdateMessage)) ||
- ((0 != name_len) && ('\0' != str[name_len - 1])))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
- }
- /**
- * Handle identity update message.
- *
- * @param cls closure
- * @param um message received
- */
- static void
- handle_identity_update (void *cls, const struct UpdateMessage *um)
- {
- struct GNUNET_IDENTITY_EgoLookup *el = cls;
- uint16_t name_len = ntohs (um->name_len);
- const char *str = (0 == name_len) ? NULL : (const char *) &um[1];
- struct GNUNET_CRYPTO_EcdsaPublicKey pub;
- struct GNUNET_HashCode id;
- struct GNUNET_IDENTITY_Ego ego;
- GNUNET_break (GNUNET_YES != ntohs (um->end_of_list));
- GNUNET_CRYPTO_ecdsa_key_get_public (&um->private_key, &pub);
- GNUNET_CRYPTO_hash (&pub, sizeof (pub), &id);
- ego.pk = (struct GNUNET_CRYPTO_EcdsaPrivateKey *) &um->private_key;
- ego.name = (char *) str;
- ego.id = id;
- el->cb (el->cb_cls, &ego);
- GNUNET_IDENTITY_ego_lookup_cancel (el);
- }
- /**
- * Generic error handler, called with the appropriate error code and
- * the same closure specified at the creation of the message queue.
- * Not every message queue implementation supports an error handler.
- *
- * @param cls closure with the `struct GNUNET_IDENTITY_EgoLookup *`
- * @param error error code
- */
- static void
- mq_error_handler (void *cls, enum GNUNET_MQ_Error error)
- {
- struct GNUNET_IDENTITY_EgoLookup *el = cls;
- el->cb (el->cb_cls, NULL);
- }
- /**
- * Lookup an ego by name.
- *
- * @param cfg configuration to use
- * @param name name to look up
- * @param cb callback to invoke with the result
- * @param cb_cls closure for @a cb
- * @return NULL on error
- */
- struct GNUNET_IDENTITY_EgoLookup *
- GNUNET_IDENTITY_ego_lookup (const struct GNUNET_CONFIGURATION_Handle *cfg,
- const char *name,
- GNUNET_IDENTITY_EgoCallback cb,
- void *cb_cls)
- {
- struct GNUNET_IDENTITY_EgoLookup *el;
- struct GNUNET_MQ_Envelope *env;
- struct GNUNET_MessageHeader *req;
- size_t nlen;
- GNUNET_assert (NULL != cb);
- el = GNUNET_new (struct GNUNET_IDENTITY_EgoLookup);
- el->cb = cb;
- el->cb_cls = cb_cls;
- {
- struct GNUNET_MQ_MessageHandler handlers[] =
- {GNUNET_MQ_hd_var_size (identity_result_code,
- GNUNET_MESSAGE_TYPE_IDENTITY_RESULT_CODE,
- struct ResultCodeMessage,
- el),
- GNUNET_MQ_hd_var_size (identity_update,
- GNUNET_MESSAGE_TYPE_IDENTITY_UPDATE,
- struct UpdateMessage,
- el),
- GNUNET_MQ_handler_end ()};
- el->mq =
- GNUNET_CLIENT_connect (cfg, "identity", handlers, &mq_error_handler, el);
- }
- if (NULL == el->mq)
- {
- GNUNET_break (0);
- GNUNET_free (el);
- return NULL;
- }
- el->name = GNUNET_strdup (name);
- nlen = strlen (name) + 1;
- env = GNUNET_MQ_msg_extra (req, nlen, GNUNET_MESSAGE_TYPE_IDENTITY_LOOKUP);
- memcpy (&req[1], name, nlen);
- GNUNET_MQ_send (el->mq, env);
- return el;
- }
- /**
- * Abort ego lookup attempt.
- *
- * @param el handle for lookup to abort
- */
- void
- GNUNET_IDENTITY_ego_lookup_cancel (struct GNUNET_IDENTITY_EgoLookup *el)
- {
- GNUNET_MQ_destroy (el->mq);
- GNUNET_free (el->name);
- GNUNET_free (el);
- }
- /* end of identity_api_lookup.c */
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