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- /*
- This file is part of GNUnet.
- Copyright (C) 2013, 2016 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.c
- * @brief api to interact with the identity service
- * @author Christian Grothoff
- */
- #include "platform.h"
- #include "gnunet_util_lib.h"
- #include "gnunet_constants.h"
- #include "gnunet_protocols.h"
- #include "gnunet_identity_service.h"
- #include "identity.h"
- #define LOG(kind, ...) GNUNET_log_from (kind, "identity-api", __VA_ARGS__)
- /**
- * Handle for an operation with the identity service.
- */
- struct GNUNET_IDENTITY_Operation
- {
- /**
- * Main identity handle.
- */
- struct GNUNET_IDENTITY_Handle *h;
- /**
- * We keep operations in a DLL.
- */
- struct GNUNET_IDENTITY_Operation *next;
- /**
- * We keep operations in a DLL.
- */
- struct GNUNET_IDENTITY_Operation *prev;
- /**
- * Message to send to the identity service.
- * Allocated at the end of this struct.
- */
- const struct GNUNET_MessageHeader *msg;
- /**
- * Continuation to invoke with the result of the transmission; @e cb
- * and @e create_cont will be NULL in this case.
- */
- GNUNET_IDENTITY_Continuation cont;
- /**
- * Continuation to invoke with the result of the transmission; @e cb
- * and @a cb will be NULL in this case.
- */
- GNUNET_IDENTITY_CreateContinuation create_cont;
- /**
- * Private key to return to @e create_cont, or NULL.
- */
- struct GNUNET_CRYPTO_EcdsaPrivateKey *pk;
- /**
- * Continuation to invoke with the result of the transmission for
- * 'get' operations (@e cont and @a create_cont will be NULL in this case).
- */
- GNUNET_IDENTITY_Callback cb;
- /**
- * Closure for @e cont or @e cb.
- */
- void *cls;
- };
- /**
- * Handle for the service.
- */
- struct GNUNET_IDENTITY_Handle
- {
- /**
- * Configuration to use.
- */
- const struct GNUNET_CONFIGURATION_Handle *cfg;
- /**
- * Connection to service.
- */
- struct GNUNET_MQ_Handle *mq;
- /**
- * Hash map from the hash of the public key to the
- * respective `GNUNET_IDENTITY_Ego` handle.
- */
- struct GNUNET_CONTAINER_MultiHashMap *egos;
- /**
- * Function to call when we receive updates.
- */
- GNUNET_IDENTITY_Callback cb;
- /**
- * Closure for @e cb.
- */
- void *cb_cls;
- /**
- * Head of active operations.
- */
- struct GNUNET_IDENTITY_Operation *op_head;
- /**
- * Tail of active operations.
- */
- struct GNUNET_IDENTITY_Operation *op_tail;
- /**
- * Task doing exponential back-off trying to reconnect.
- */
- struct GNUNET_SCHEDULER_Task *reconnect_task;
- /**
- * Time for next connect retry.
- */
- struct GNUNET_TIME_Relative reconnect_delay;
- /**
- * Are we polling for incoming messages right now?
- */
- int in_receive;
- };
- /**
- * Obtain the ego representing 'anonymous' users.
- *
- * @return handle for the anonymous user, must not be freed
- */
- const struct GNUNET_IDENTITY_Ego *
- GNUNET_IDENTITY_ego_get_anonymous ()
- {
- static struct GNUNET_IDENTITY_Ego anon;
- struct GNUNET_CRYPTO_EcdsaPublicKey pub;
- if (NULL != anon.pk)
- return &anon;
- anon.pk = (struct GNUNET_CRYPTO_EcdsaPrivateKey *)
- GNUNET_CRYPTO_ecdsa_key_get_anonymous ();
- GNUNET_CRYPTO_ecdsa_key_get_public (anon.pk, &pub);
- GNUNET_CRYPTO_hash (&pub, sizeof (pub), &anon.id);
- return &anon;
- }
- /**
- * Try again to connect to the identity service.
- *
- * @param cls handle to the identity service.
- */
- static void
- reconnect (void *cls);
- /**
- * Free ego from hash map.
- *
- * @param cls identity service handle
- * @param key unused
- * @param value ego to free
- * @return #GNUNET_OK (continue to iterate)
- */
- static int
- free_ego (void *cls, const struct GNUNET_HashCode *key, void *value)
- {
- struct GNUNET_IDENTITY_Handle *h = cls;
- struct GNUNET_IDENTITY_Ego *ego = value;
- if (NULL != h->cb)
- h->cb (h->cb_cls, ego, &ego->ctx, NULL);
- GNUNET_free (ego->pk);
- GNUNET_free (ego->name);
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (h->egos, key, value));
- GNUNET_free (ego);
- return GNUNET_OK;
- }
- /**
- * Reschedule a connect attempt to the service.
- *
- * @param h transport service to reconnect
- */
- static void
- reschedule_connect (struct GNUNET_IDENTITY_Handle *h)
- {
- struct GNUNET_IDENTITY_Operation *op;
- GNUNET_assert (NULL == h->reconnect_task);
- if (NULL != h->mq)
- {
- GNUNET_MQ_destroy (h->mq);
- h->mq = NULL;
- }
- while (NULL != (op = h->op_head))
- {
- GNUNET_CONTAINER_DLL_remove (h->op_head, h->op_tail, op);
- if (NULL != op->cont)
- op->cont (op->cls, "Error in communication with the identity service");
- else if (NULL != op->cb)
- op->cb (op->cls, NULL, NULL, NULL);
- else if (NULL != op->create_cont)
- op->create_cont (op->cls,
- NULL,
- "Failed to communicate with the identity service");
- GNUNET_free_non_null (op->pk);
- GNUNET_free (op);
- }
- GNUNET_CONTAINER_multihashmap_iterate (h->egos, &free_ego, h);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Scheduling task to reconnect to identity service in %s.\n",
- GNUNET_STRINGS_relative_time_to_string (h->reconnect_delay, GNUNET_YES));
- h->reconnect_task =
- GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
- h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
- }
- /**
- * 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_Handle *`
- * @param error error code
- */
- static void
- mq_error_handler (void *cls, enum GNUNET_MQ_Error error)
- {
- struct GNUNET_IDENTITY_Handle *h = cls;
- reschedule_connect (h);
- }
- /**
- * 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_Handle *h = cls;
- struct GNUNET_IDENTITY_Operation *op;
- uint16_t size = ntohs (rcm->header.size) - sizeof (*rcm);
- const char *str = (0 == size) ? NULL : (const char *) &rcm[1];
- op = h->op_head;
- if (NULL == op)
- {
- GNUNET_break (0);
- reschedule_connect (h);
- return;
- }
- GNUNET_CONTAINER_DLL_remove (h->op_head, h->op_tail, op);
- if (NULL != op->cont)
- op->cont (op->cls, str);
- else if (NULL != op->cb)
- op->cb (op->cls, NULL, NULL, NULL);
- else if (NULL != op->create_cont)
- op->create_cont (op->cls, (NULL == str) ? op->pk : NULL, str);
- GNUNET_free_non_null (op->pk);
- GNUNET_free (op);
- }
- /**
- * 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_Handle *h = 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;
- if (GNUNET_YES == ntohs (um->end_of_list))
- {
- /* end of initial list of data */
- if (NULL != h->cb)
- h->cb (h->cb_cls, NULL, NULL, NULL);
- return;
- }
- GNUNET_CRYPTO_ecdsa_key_get_public (&um->private_key, &pub);
- GNUNET_CRYPTO_hash (&pub, sizeof (pub), &id);
- ego = GNUNET_CONTAINER_multihashmap_get (h->egos, &id);
- if (NULL == ego)
- {
- /* ego was created */
- if (NULL == str)
- {
- /* deletion of unknown ego? not allowed */
- GNUNET_break (0);
- reschedule_connect (h);
- return;
- }
- ego = GNUNET_new (struct GNUNET_IDENTITY_Ego);
- ego->pk = GNUNET_new (struct GNUNET_CRYPTO_EcdsaPrivateKey);
- *ego->pk = um->private_key;
- ego->name = GNUNET_strdup (str);
- ego->id = id;
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_put (
- h->egos,
- &ego->id,
- ego,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
- }
- if (NULL == str)
- {
- /* ego was deleted */
- GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove (h->egos,
- &ego->id,
- ego));
- }
- else
- {
- /* ego changed name */
- GNUNET_free (ego->name);
- ego->name = GNUNET_strdup (str);
- }
- /* inform application about change */
- if (NULL != h->cb)
- h->cb (h->cb_cls, ego, &ego->ctx, str);
- /* complete deletion */
- if (NULL == str)
- {
- GNUNET_free (ego->pk);
- GNUNET_free (ego->name);
- GNUNET_free (ego);
- }
- }
- /**
- * Function called when we receive a set default message from the
- * service.
- *
- * @param cls closure
- * @param sdm message received
- * @return #GNUNET_OK if the message is well-formed
- */
- static int
- check_identity_set_default (void *cls, const struct SetDefaultMessage *sdm)
- {
- uint16_t size = ntohs (sdm->header.size) - sizeof (*sdm);
- uint16_t name_len = ntohs (sdm->name_len);
- const char *str = (const char *) &sdm[1];
- if ((size != name_len) || ((0 != name_len) && ('\0' != str[name_len - 1])))
- {
- GNUNET_break (0);
- return GNUNET_SYSERR;
- }
- GNUNET_break (0 == ntohs (sdm->reserved));
- return GNUNET_OK;
- }
- /**
- * Type of a function to call when we receive a message
- * from the service.
- *
- * @param cls closure
- * @param sdm message received
- */
- static void
- handle_identity_set_default (void *cls, const struct SetDefaultMessage *sdm)
- {
- struct GNUNET_IDENTITY_Handle *h = cls;
- struct GNUNET_IDENTITY_Operation *op;
- struct GNUNET_CRYPTO_EcdsaPublicKey pub;
- struct GNUNET_HashCode id;
- struct GNUNET_IDENTITY_Ego *ego;
- GNUNET_CRYPTO_ecdsa_key_get_public (&sdm->private_key, &pub);
- GNUNET_CRYPTO_hash (&pub, sizeof (pub), &id);
- ego = GNUNET_CONTAINER_multihashmap_get (h->egos, &id);
- if (NULL == ego)
- {
- GNUNET_break (0);
- reschedule_connect (h);
- return;
- }
- op = h->op_head;
- if (NULL == op)
- {
- GNUNET_break (0);
- reschedule_connect (h);
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Received SET_DEFAULT message from identity service\n");
- GNUNET_CONTAINER_DLL_remove (h->op_head, h->op_tail, op);
- if (NULL != op->cb)
- op->cb (op->cls, ego, &ego->ctx, ego->name);
- GNUNET_free (op);
- }
- /**
- * Try again to connect to the identity service.
- *
- * @param cls handle to the identity service.
- */
- static void
- reconnect (void *cls)
- {
- struct GNUNET_IDENTITY_Handle *h = cls;
- struct GNUNET_MQ_MessageHandler handlers[] =
- {GNUNET_MQ_hd_var_size (identity_result_code,
- GNUNET_MESSAGE_TYPE_IDENTITY_RESULT_CODE,
- struct ResultCodeMessage,
- h),
- GNUNET_MQ_hd_var_size (identity_update,
- GNUNET_MESSAGE_TYPE_IDENTITY_UPDATE,
- struct UpdateMessage,
- h),
- GNUNET_MQ_hd_var_size (identity_set_default,
- GNUNET_MESSAGE_TYPE_IDENTITY_SET_DEFAULT,
- struct SetDefaultMessage,
- h),
- GNUNET_MQ_handler_end ()};
- struct GNUNET_MQ_Envelope *env;
- struct GNUNET_MessageHeader *msg;
- h->reconnect_task = NULL;
- LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to identity service.\n");
- GNUNET_assert (NULL == h->mq);
- h->mq =
- GNUNET_CLIENT_connect (h->cfg, "identity", handlers, &mq_error_handler, h);
- if (NULL == h->mq)
- return;
- if (NULL != h->cb)
- {
- env = GNUNET_MQ_msg (msg, GNUNET_MESSAGE_TYPE_IDENTITY_START);
- GNUNET_MQ_send (h->mq, env);
- }
- }
- /**
- * Connect to the identity service.
- *
- * @param cfg the configuration to use
- * @param cb function to call on all identity events, can be NULL
- * @param cb_cls closure for @a cb
- * @return handle to use
- */
- struct GNUNET_IDENTITY_Handle *
- GNUNET_IDENTITY_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
- GNUNET_IDENTITY_Callback cb,
- void *cb_cls)
- {
- struct GNUNET_IDENTITY_Handle *h;
- h = GNUNET_new (struct GNUNET_IDENTITY_Handle);
- h->cfg = cfg;
- h->cb = cb;
- h->cb_cls = cb_cls;
- h->egos = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_YES);
- reconnect (h);
- if (NULL == h->mq)
- {
- GNUNET_free (h);
- return NULL;
- }
- return h;
- }
- /**
- * Obtain the ECC key associated with a ego.
- *
- * @param ego the ego
- * @return associated ECC key, valid as long as the ego is valid
- */
- const struct GNUNET_CRYPTO_EcdsaPrivateKey *
- GNUNET_IDENTITY_ego_get_private_key (const struct GNUNET_IDENTITY_Ego *ego)
- {
- return ego->pk;
- }
- /**
- * Get the identifier (public key) of an ego.
- *
- * @param ego identity handle with the private key
- * @param pk set to ego's public key
- */
- void
- GNUNET_IDENTITY_ego_get_public_key (const struct GNUNET_IDENTITY_Ego *ego,
- struct GNUNET_CRYPTO_EcdsaPublicKey *pk)
- {
- GNUNET_CRYPTO_ecdsa_key_get_public (ego->pk, pk);
- }
- /**
- * Obtain the identity that is currently preferred/default
- * for a service.
- *
- * @param h identity service to query
- * @param service_name for which service is an identity wanted
- * @param cb function to call with the result (will only be called once)
- * @param cb_cls closure for @a cb
- * @return handle to abort the operation
- */
- struct GNUNET_IDENTITY_Operation *
- GNUNET_IDENTITY_get (struct GNUNET_IDENTITY_Handle *h,
- const char *service_name,
- GNUNET_IDENTITY_Callback cb,
- void *cb_cls)
- {
- struct GNUNET_IDENTITY_Operation *op;
- struct GNUNET_MQ_Envelope *env;
- struct GetDefaultMessage *gdm;
- size_t slen;
- if (NULL == h->mq)
- return NULL;
- GNUNET_assert (NULL != h->cb);
- slen = strlen (service_name) + 1;
- if (slen >= GNUNET_MAX_MESSAGE_SIZE - sizeof (struct GetDefaultMessage))
- {
- GNUNET_break (0);
- return NULL;
- }
- op = GNUNET_new (struct GNUNET_IDENTITY_Operation);
- op->h = h;
- op->cb = cb;
- op->cls = cb_cls;
- GNUNET_CONTAINER_DLL_insert_tail (h->op_head, h->op_tail, op);
- env =
- GNUNET_MQ_msg_extra (gdm, slen, GNUNET_MESSAGE_TYPE_IDENTITY_GET_DEFAULT);
- gdm->name_len = htons (slen);
- gdm->reserved = htons (0);
- GNUNET_memcpy (&gdm[1], service_name, slen);
- GNUNET_MQ_send (h->mq, env);
- return op;
- }
- /**
- * Set the preferred/default identity for a service.
- *
- * @param h identity service to inform
- * @param service_name for which service is an identity set
- * @param ego new default identity to be set for this service
- * @param cont function to call once the operation finished
- * @param cont_cls closure for @a cont
- * @return handle to abort the operation
- */
- struct GNUNET_IDENTITY_Operation *
- GNUNET_IDENTITY_set (struct GNUNET_IDENTITY_Handle *h,
- const char *service_name,
- struct GNUNET_IDENTITY_Ego *ego,
- GNUNET_IDENTITY_Continuation cont,
- void *cont_cls)
- {
- struct GNUNET_IDENTITY_Operation *op;
- struct GNUNET_MQ_Envelope *env;
- struct SetDefaultMessage *sdm;
- size_t slen;
- if (NULL == h->mq)
- return NULL;
- GNUNET_assert (NULL != h->cb);
- slen = strlen (service_name) + 1;
- if (slen >= GNUNET_MAX_MESSAGE_SIZE - sizeof (struct SetDefaultMessage))
- {
- GNUNET_break (0);
- return NULL;
- }
- op = GNUNET_new (struct GNUNET_IDENTITY_Operation);
- op->h = h;
- op->cont = cont;
- op->cls = cont_cls;
- GNUNET_CONTAINER_DLL_insert_tail (h->op_head, h->op_tail, op);
- env =
- GNUNET_MQ_msg_extra (sdm, slen, GNUNET_MESSAGE_TYPE_IDENTITY_SET_DEFAULT);
- sdm->name_len = htons (slen);
- sdm->reserved = htons (0);
- sdm->private_key = *ego->pk;
- GNUNET_memcpy (&sdm[1], service_name, slen);
- GNUNET_MQ_send (h->mq, env);
- return op;
- }
- /**
- * Create a new identity with the given name.
- *
- * @param h identity service to use
- * @param name desired name
- * @param cont function to call with the result (will only be called once)
- * @param cont_cls closure for @a cont
- * @return handle to abort the operation
- */
- struct GNUNET_IDENTITY_Operation *
- GNUNET_IDENTITY_create (struct GNUNET_IDENTITY_Handle *h,
- const char *name,
- GNUNET_IDENTITY_CreateContinuation cont,
- void *cont_cls)
- {
- struct GNUNET_IDENTITY_Operation *op;
- struct GNUNET_MQ_Envelope *env;
- struct CreateRequestMessage *crm;
- struct GNUNET_CRYPTO_EcdsaPrivateKey *pk;
- size_t slen;
- if (NULL == h->mq)
- return NULL;
- slen = strlen (name) + 1;
- if (slen >= GNUNET_MAX_MESSAGE_SIZE - sizeof (struct CreateRequestMessage))
- {
- GNUNET_break (0);
- return NULL;
- }
- op = GNUNET_new (struct GNUNET_IDENTITY_Operation);
- op->h = h;
- op->create_cont = cont;
- op->cls = cont_cls;
- GNUNET_CONTAINER_DLL_insert_tail (h->op_head, h->op_tail, op);
- env = GNUNET_MQ_msg_extra (crm, slen, GNUNET_MESSAGE_TYPE_IDENTITY_CREATE);
- crm->name_len = htons (slen);
- crm->reserved = htons (0);
- pk = GNUNET_CRYPTO_ecdsa_key_create ();
- crm->private_key = *pk;
- op->pk = pk;
- GNUNET_memcpy (&crm[1], name, slen);
- GNUNET_MQ_send (h->mq, env);
- return op;
- }
- /**
- * Renames an existing identity.
- *
- * @param h identity service to use
- * @param old_name old name
- * @param new_name desired new name
- * @param cb function to call with the result (will only be called once)
- * @param cb_cls closure for @a cb
- * @return handle to abort the operation
- */
- struct GNUNET_IDENTITY_Operation *
- GNUNET_IDENTITY_rename (struct GNUNET_IDENTITY_Handle *h,
- const char *old_name,
- const char *new_name,
- GNUNET_IDENTITY_Continuation cb,
- void *cb_cls)
- {
- struct GNUNET_IDENTITY_Operation *op;
- struct GNUNET_MQ_Envelope *env;
- struct RenameMessage *grm;
- size_t slen_old;
- size_t slen_new;
- char *dst;
- if (NULL == h->mq)
- return NULL;
- slen_old = strlen (old_name) + 1;
- slen_new = strlen (new_name) + 1;
- if ((slen_old >= GNUNET_MAX_MESSAGE_SIZE) ||
- (slen_new >= GNUNET_MAX_MESSAGE_SIZE) ||
- (slen_old + slen_new >=
- GNUNET_MAX_MESSAGE_SIZE - sizeof (struct RenameMessage)))
- {
- GNUNET_break (0);
- return NULL;
- }
- op = GNUNET_new (struct GNUNET_IDENTITY_Operation);
- op->h = h;
- op->cont = cb;
- op->cls = cb_cls;
- GNUNET_CONTAINER_DLL_insert_tail (h->op_head, h->op_tail, op);
- env = GNUNET_MQ_msg_extra (grm,
- slen_old + slen_new,
- GNUNET_MESSAGE_TYPE_IDENTITY_RENAME);
- grm->old_name_len = htons (slen_old);
- grm->new_name_len = htons (slen_new);
- dst = (char *) &grm[1];
- GNUNET_memcpy (dst, old_name, slen_old);
- GNUNET_memcpy (&dst[slen_old], new_name, slen_new);
- GNUNET_MQ_send (h->mq, env);
- return op;
- }
- /**
- * Delete an existing identity.
- *
- * @param h identity service to use
- * @param name name of the identity to delete
- * @param cb function to call with the result (will only be called once)
- * @param cb_cls closure for @a cb
- * @return handle to abort the operation
- */
- struct GNUNET_IDENTITY_Operation *
- GNUNET_IDENTITY_delete (struct GNUNET_IDENTITY_Handle *h,
- const char *name,
- GNUNET_IDENTITY_Continuation cb,
- void *cb_cls)
- {
- struct GNUNET_IDENTITY_Operation *op;
- struct GNUNET_MQ_Envelope *env;
- struct DeleteMessage *gdm;
- size_t slen;
- if (NULL == h->mq)
- return NULL;
- slen = strlen (name) + 1;
- if (slen >= GNUNET_MAX_MESSAGE_SIZE - sizeof (struct DeleteMessage))
- {
- GNUNET_break (0);
- return NULL;
- }
- op = GNUNET_new (struct GNUNET_IDENTITY_Operation);
- op->h = h;
- op->cont = cb;
- op->cls = cb_cls;
- GNUNET_CONTAINER_DLL_insert_tail (h->op_head, h->op_tail, op);
- env = GNUNET_MQ_msg_extra (gdm, slen, GNUNET_MESSAGE_TYPE_IDENTITY_DELETE);
- gdm->name_len = htons (slen);
- gdm->reserved = htons (0);
- GNUNET_memcpy (&gdm[1], name, slen);
- GNUNET_MQ_send (h->mq, env);
- return op;
- }
- /**
- * Cancel an identity operation. Note that the operation MAY still
- * be executed; this merely cancels the continuation; if the request
- * was already transmitted, the service may still choose to complete
- * the operation.
- *
- * @param op operation to cancel
- */
- void
- GNUNET_IDENTITY_cancel (struct GNUNET_IDENTITY_Operation *op)
- {
- op->cont = NULL;
- op->cb = NULL;
- op->create_cont = NULL;
- if (NULL != op->pk)
- {
- GNUNET_free (op->pk);
- op->pk = NULL;
- }
- }
- /**
- * Disconnect from identity service
- *
- * @param h handle to destroy
- */
- void
- GNUNET_IDENTITY_disconnect (struct GNUNET_IDENTITY_Handle *h)
- {
- struct GNUNET_IDENTITY_Operation *op;
- GNUNET_assert (NULL != h);
- if (h->reconnect_task != NULL)
- {
- GNUNET_SCHEDULER_cancel (h->reconnect_task);
- h->reconnect_task = NULL;
- }
- if (NULL != h->egos)
- {
- GNUNET_CONTAINER_multihashmap_iterate (h->egos, &free_ego, h);
- GNUNET_CONTAINER_multihashmap_destroy (h->egos);
- h->egos = NULL;
- }
- while (NULL != (op = h->op_head))
- {
- GNUNET_break (NULL == op->cont);
- GNUNET_CONTAINER_DLL_remove (h->op_head, h->op_tail, op);
- GNUNET_free_non_null (op->pk);
- GNUNET_free (op);
- }
- if (NULL != h->mq)
- {
- GNUNET_MQ_destroy (h->mq);
- h->mq = NULL;
- }
- GNUNET_free (h);
- }
- /* end of identity_api.c */
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