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Diffstat (limited to 'src/namestore/namestore_api.c')
| -rw-r--r-- | src/namestore/namestore_api.c | 1194 |
1 files changed, 1194 insertions, 0 deletions
diff --git a/src/namestore/namestore_api.c b/src/namestore/namestore_api.c new file mode 100644 index 0000000..1d41399 --- /dev/null +++ b/src/namestore/namestore_api.c @@ -0,0 +1,1194 @@ +/* + This file is part of GNUnet. + (C) 2009, 2010 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 namestore/namestore_api.c + * @brief API to access the NAMESTORE service + * @author Martin Schanzenbach + * @author Matthias Wachs + */ + +#include "platform.h" +#include "gnunet_util_lib.h" +#include "gnunet_constants.h" +#include "gnunet_arm_service.h" +#include "gnunet_namestore_service.h" +#include "namestore.h" +#define DEBUG_GNS_API GNUNET_EXTRA_LOGGING + +#define LOG(kind,...) GNUNET_log_from (kind, "gns-api",__VA_ARGS__) + +/** + * A QueueEntry. + */ +struct GNUNET_NAMESTORE_QueueEntry +{ + struct GNUNET_NAMESTORE_QueueEntry *next; + struct GNUNET_NAMESTORE_QueueEntry *prev; + + struct GNUNET_NAMESTORE_Handle *nsh; + + uint32_t op_id; + + GNUNET_NAMESTORE_ContinuationWithStatus cont; + void *cont_cls; + + GNUNET_NAMESTORE_RecordProcessor proc; + void *proc_cls; + + char *data; /*stub data pointer*/ +}; + + +/** + * Zone iterator + */ +struct GNUNET_NAMESTORE_ZoneIterator +{ + struct GNUNET_NAMESTORE_ZoneIterator *next; + struct GNUNET_NAMESTORE_ZoneIterator *prev; + + uint32_t op_id; + + struct GNUNET_NAMESTORE_Handle *h; + GNUNET_NAMESTORE_RecordProcessor proc; + void* proc_cls; + GNUNET_HashCode zone; + uint32_t no_flags; + uint32_t flags; +}; + + +/** + * Message in linked list we should send to the service. The + * actual binary message follows this struct. + */ +struct PendingMessage +{ + + /** + * Kept in a DLL. + */ + struct PendingMessage *next; + + /** + * Kept in a DLL. + */ + struct PendingMessage *prev; + + /** + * Size of the message. + */ + size_t size; + + /** + * Is this the 'START' message? + */ + int is_init; +}; + + +/** + * Connection to the NAMESTORE service. + */ +struct GNUNET_NAMESTORE_Handle +{ + + /** + * Configuration to use. + */ + const struct GNUNET_CONFIGURATION_Handle *cfg; + + /** + * Socket (if available). + */ + struct GNUNET_CLIENT_Connection *client; + + /** + * Currently pending transmission request (or NULL). + */ + struct GNUNET_CLIENT_TransmitHandle *th; + + /** + * Reconnect task + */ + GNUNET_SCHEDULER_TaskIdentifier reconnect_task; + + /** + * Pending messages to send to the service + */ + + struct PendingMessage * pending_head; + struct PendingMessage * pending_tail; + + /** + * Should we reconnect to service due to some serious error? + */ + int reconnect; + + + /** + * Pending namestore queue entries + */ + struct GNUNET_NAMESTORE_QueueEntry * op_head; + struct GNUNET_NAMESTORE_QueueEntry * op_tail; + + uint32_t op_id; + + /** + * Pending namestore zone iterator entries + */ + struct GNUNET_NAMESTORE_ZoneIterator * z_head; + struct GNUNET_NAMESTORE_ZoneIterator * z_tail; +}; + +struct GNUNET_NAMESTORE_SimpleRecord +{ + /** + * DLL + */ + struct GNUNET_NAMESTORE_SimpleRecord *next; + + /** + * DLL + */ + struct GNUNET_NAMESTORE_SimpleRecord *prev; + + const char *name; + const GNUNET_HashCode *zone; + uint32_t record_type; + struct GNUNET_TIME_Absolute expiration; + enum GNUNET_NAMESTORE_RecordFlags flags; + size_t data_size; + const void *data; +}; + + +/** + * Disconnect from service and then reconnect. + * + * @param h our handle + */ +static void +force_reconnect (struct GNUNET_NAMESTORE_Handle *h); + +static void +handle_lookup_name_response (struct GNUNET_NAMESTORE_QueueEntry *qe, + struct LookupNameResponseMessage * msg, + size_t size) +{ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' \n", + "LOOKUP_NAME_RESPONSE"); + + struct GNUNET_NAMESTORE_Handle *h = qe->nsh; + struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key; + char *name; + struct GNUNET_NAMESTORE_RecordData *rd = NULL; + struct GNUNET_CRYPTO_RsaSignature *signature = NULL; + struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded dummy; + struct GNUNET_TIME_Absolute expire; + unsigned int rd_count = 0; + size_t msg_len = 0; + size_t name_len = 0; + int contains_sig = GNUNET_NO; + + rd_count = ntohl (msg->rc_count); + msg_len = ntohs (msg->header.size); + name_len = ntohs (msg->name_len); + contains_sig = ntohs (msg->contains_sig); + expire = GNUNET_TIME_absolute_ntoh(msg->expire); + + if (msg_len != sizeof (struct LookupNameResponseMessage) + + sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + + name_len + + rd_count * sizeof (struct GNUNET_NAMESTORE_RecordData) + + contains_sig * sizeof (struct GNUNET_CRYPTO_RsaSignature)) + { + GNUNET_break_op (0); + return; + } + + zone_key = (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *) &msg[1]; + name = (char *) &zone_key[1]; + rd = (struct GNUNET_NAMESTORE_RecordData *) &name[name_len]; + + /* reset values if values not contained */ + if (contains_sig == GNUNET_NO) + signature = NULL; + else + signature = (struct GNUNET_CRYPTO_RsaSignature *) &rd[rd_count]; + if (rd_count == 0) + rd = NULL; + if (name_len == 0) + name = NULL; + + memset (&dummy, '0', sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded)); + if (0 == memcmp (zone_key, &dummy, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded))) + zone_key = NULL; + + if (qe->proc != NULL) + { + qe->proc (qe->proc_cls, zone_key, expire, name, rd_count, rd, signature); + } + /* Operation done, remove */ + GNUNET_CONTAINER_DLL_remove(h->op_head, h->op_tail, qe); + GNUNET_free (qe); +} + + +static void +handle_record_put_response (struct GNUNET_NAMESTORE_QueueEntry *qe, + struct RecordPutResponseMessage* msg, + size_t size) +{ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' \n", + "RECORD_PUT_RESPONSE"); + + struct GNUNET_NAMESTORE_Handle *h = qe->nsh; + int res = GNUNET_OK; + + if (ntohs (msg->op_result) == GNUNET_OK) + { + res = GNUNET_OK; + if (qe->cont != NULL) + { + qe->cont (qe->cont_cls, res, _("Namestore added record successfully")); + } + + } + else if (ntohs (msg->op_result) == GNUNET_NO) + { + res = GNUNET_SYSERR; + if (qe->cont != NULL) + { + qe->cont (qe->cont_cls, res, _("Namestore failed to add record")); + } + } + else + { + GNUNET_break_op (0); + return; + } + + /* Operation done, remove */ + GNUNET_CONTAINER_DLL_remove(h->op_head, h->op_tail, qe); + + GNUNET_free (qe); +} + + +static void +handle_record_create_response (struct GNUNET_NAMESTORE_QueueEntry *qe, + struct RecordCreateResponseMessage* msg, + size_t size) +{ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' \n", + "RECORD_CREATE_RESPONSE"); + + struct GNUNET_NAMESTORE_Handle *h = qe->nsh; + int res = GNUNET_OK; + + if (ntohs (msg->op_result) == GNUNET_OK) + { + res = GNUNET_OK; + if (qe->cont != NULL) + { + qe->cont (qe->cont_cls, res, _("Namestore added record successfully")); + } + + } + else if (ntohs (msg->op_result) == GNUNET_NO) + { + res = GNUNET_SYSERR; + if (qe->cont != NULL) + { + qe->cont (qe->cont_cls, res, _("Namestore failed to add record")); + } + } + else + { + GNUNET_break_op (0); + return; + } + + /* Operation done, remove */ + GNUNET_CONTAINER_DLL_remove(h->op_head, h->op_tail, qe); + + GNUNET_free (qe); +} + + +static void +manage_record_operations (struct GNUNET_NAMESTORE_QueueEntry *qe, + const struct GNUNET_MessageHeader *msg, + int type, size_t size) +{ + + /* handle different message type */ + switch (type) { + case GNUNET_MESSAGE_TYPE_NAMESTORE_LOOKUP_NAME_RESPONSE: + if (size < sizeof (struct LookupNameResponseMessage)) + { + GNUNET_break_op (0); + break; + } + handle_lookup_name_response (qe, (struct LookupNameResponseMessage *) msg, size); + break; + case GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_PUT_RESPONSE: + if (size != sizeof (struct RecordPutResponseMessage)) + { + GNUNET_break_op (0); + break; + } + handle_record_put_response (qe, (struct RecordPutResponseMessage *) msg, size); + break; + case GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_CREATE_RESPONSE: + if (size != sizeof (struct RecordCreateResponseMessage)) + { + GNUNET_break_op (0); + break; + } + handle_record_create_response (qe, (struct RecordCreateResponseMessage *) msg, size); + break; + default: + GNUNET_break_op (0); + break; + } +} + +static void +handle_zone_iteration_response (struct GNUNET_NAMESTORE_ZoneIterator *ze, + struct ZoneIterationResponseMessage *msg, + size_t size) +{ + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received `%s' \n", + "ZONE_ITERATION_RESPONSE"); + + + if (ze->proc != NULL) + { + // FIXME + ze->proc(ze->proc_cls, NULL, GNUNET_TIME_absolute_get_forever(), "dummy", 0, NULL, NULL); + } +} + + +static void +manage_zone_operations (struct GNUNET_NAMESTORE_ZoneIterator *ze, + const struct GNUNET_MessageHeader *msg, + int type, size_t size) +{ + + /* handle different message type */ + switch (type) { + case GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_RESPONSE: + if (size < sizeof (struct ZoneIterationResponseMessage)) + { + GNUNET_break_op (0); + break; + } + handle_zone_iteration_response (ze, (struct ZoneIterationResponseMessage *) msg, size); + break; + default: + GNUNET_break_op (0); + break; + } +} + +/** + * Type of a function to call when we receive a message + * from the service. + * + * @param cls the 'struct GNUNET_NAMESTORE_SchedulingHandle' + * @param msg message received, NULL on timeout or fatal error + */ +static void +process_namestore_message (void *cls, const struct GNUNET_MessageHeader *msg) +{ + struct GNUNET_NAMESTORE_Handle *h = cls; + struct GenericMessage * gm; + struct GNUNET_NAMESTORE_QueueEntry *qe; + struct GNUNET_NAMESTORE_ZoneIterator *ze; + uint16_t size; + uint16_t type; + uint32_t op_id = UINT32_MAX; + + if (NULL == msg) + { + force_reconnect (h); + return; + } + + size = ntohs (msg->size); + type = ntohs (msg->type); + + if (size < sizeof (struct GenericMessage)) + { + GNUNET_break_op (0); + GNUNET_CLIENT_receive (h->client, &process_namestore_message, h, + GNUNET_TIME_UNIT_FOREVER_REL); + return; + } + + gm = (struct GenericMessage *) msg; + op_id = ntohl (gm->op_id); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received message type %i size %i op %u\n", type, size, op_id); + + /* Find matching operation */ + if (op_id > h->op_id) + { + /* No matching pending operation found */ + GNUNET_break_op (0); + GNUNET_CLIENT_receive (h->client, &process_namestore_message, h, + GNUNET_TIME_UNIT_FOREVER_REL); + return; + } + + /* Is it a record related operation ? */ + for (qe = h->op_head; qe != NULL; qe = qe->next) + { + if (qe->op_id == op_id) + break; + } + if (qe != NULL) + { + manage_record_operations (qe, msg, type, size); + } + + /* Is it a zone iteration operation ? */ + for (ze = h->z_head; ze != NULL; ze = ze->next) + { + if (ze->op_id == op_id) + break; + } + if (ze != NULL) + { + manage_zone_operations (ze, msg, type, size); + } + + GNUNET_CLIENT_receive (h->client, &process_namestore_message, h, + GNUNET_TIME_UNIT_FOREVER_REL); + + if (GNUNET_YES == h->reconnect) + force_reconnect (h); + +} + + +/** + * Transmit messages from the message queue to the service + * (if there are any, and if we are not already trying). + * + * @param h handle to use + */ +static void +do_transmit (struct GNUNET_NAMESTORE_Handle *h); + + +/** + * We can now transmit a message to NAMESTORE. Do it. + * + * @param cls the 'struct GNUNET_NAMESTORE_Handle' + * @param size number of bytes we can transmit + * @param buf where to copy the messages + * @return number of bytes copied into buf + */ +static size_t +transmit_message_to_namestore (void *cls, size_t size, void *buf) +{ + struct GNUNET_NAMESTORE_Handle *h = cls; + struct PendingMessage *p; + size_t ret; + char *cbuf; + + h->th = NULL; + if ((size == 0) || (buf == NULL)) + { + force_reconnect (h); + return 0; + } + ret = 0; + cbuf = buf; + while ((NULL != (p = h->pending_head)) && (p->size <= size)) + { + memcpy (&cbuf[ret], &p[1], p->size); + ret += p->size; + size -= p->size; + GNUNET_CONTAINER_DLL_remove (h->pending_head, h->pending_tail, p); + if (GNUNET_YES == p->is_init) + GNUNET_CLIENT_receive (h->client, &process_namestore_message, h, + GNUNET_TIME_UNIT_FOREVER_REL); + GNUNET_free (p); + } + do_transmit (h); + return ret; +} + + +/** + * Transmit messages from the message queue to the service + * (if there are any, and if we are not already trying). + * + * @param h handle to use + */ +static void +do_transmit (struct GNUNET_NAMESTORE_Handle *h) +{ + struct PendingMessage *p; + + if (NULL != h->th) + return; + if (NULL == (p = h->pending_head)) + return; + if (NULL == h->client) + return; /* currently reconnecting */ + + h->th = GNUNET_CLIENT_notify_transmit_ready (h->client, p->size, + GNUNET_TIME_UNIT_FOREVER_REL, + GNUNET_NO, &transmit_message_to_namestore, + h); +} + + +/** + * Reconnect to namestore service. + * + * @param h the handle to the namestore service + */ +static void +reconnect (struct GNUNET_NAMESTORE_Handle *h) +{ + struct PendingMessage *p; + struct StartMessage *init; + + GNUNET_assert (NULL == h->client); + h->client = GNUNET_CLIENT_connect ("namestore", h->cfg); + GNUNET_assert (NULL != h->client); + + if ((NULL == (p = h->pending_head)) || (GNUNET_YES != p->is_init)) + { + p = GNUNET_malloc (sizeof (struct PendingMessage) + + sizeof (struct StartMessage)); + p->size = sizeof (struct StartMessage); + p->is_init = GNUNET_YES; + init = (struct StartMessage *) &p[1]; + init->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_START); + init->header.size = htons (sizeof (struct StartMessage)); + GNUNET_CONTAINER_DLL_insert (h->pending_head, h->pending_tail, p); + } + do_transmit (h); +} + +/** + * Re-establish the connection to the service. + * + * @param cls handle to use to re-connect. + * @param tc scheduler context + */ +static void +reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) +{ + struct GNUNET_NAMESTORE_Handle *h = cls; + + h->reconnect_task = GNUNET_SCHEDULER_NO_TASK; + reconnect (h); +} + + +/** + * Disconnect from service and then reconnect. + * + * @param h our handle + */ +static void +force_reconnect (struct GNUNET_NAMESTORE_Handle *h) +{ + h->reconnect = GNUNET_NO; + GNUNET_CLIENT_disconnect (h->client, GNUNET_NO); + h->client = NULL; + h->reconnect_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS, + &reconnect_task, + h); +} + +static uint32_t +get_op_id (struct GNUNET_NAMESTORE_Handle *h) +{ + uint32_t op_id = h->op_id; + h->op_id ++; + return op_id; +} + +/** + * Initialize the connection with the NAMESTORE service. + * + * @param cfg configuration to use + * @return handle to the GNS service, or NULL on error + */ +struct GNUNET_NAMESTORE_Handle * +GNUNET_NAMESTORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg) +{ + struct GNUNET_NAMESTORE_Handle *h; + + h = GNUNET_malloc (sizeof (struct GNUNET_NAMESTORE_Handle)); + h->cfg = cfg; + h->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect_task, h); + h->op_id = 0; + return h; +} + + +/** + * Disconnect from the namestore service (and free associated + * resources). + * + * @param h handle to the namestore + * @param drop set to GNUNET_YES to delete all data in namestore (!) + */ +void +GNUNET_NAMESTORE_disconnect (struct GNUNET_NAMESTORE_Handle *h, int drop) +{ + struct PendingMessage *p; + struct GNUNET_NAMESTORE_QueueEntry *q; + struct GNUNET_NAMESTORE_ZoneIterator *z; + + GNUNET_assert (h != NULL); + + while (NULL != (p = h->pending_head)) + { + GNUNET_CONTAINER_DLL_remove (h->pending_head, h->pending_tail, p); + GNUNET_free (p); + } + + while (NULL != (q = h->op_head)) + { + GNUNET_CONTAINER_DLL_remove (h->op_head, h->op_tail, q); + GNUNET_free (q); + } + + while (NULL != (z = h->z_head)) + { + GNUNET_CONTAINER_DLL_remove (h->z_head, h->z_tail, z); + GNUNET_free (z); + } + + if (NULL != h->client) + { + GNUNET_CLIENT_disconnect (h->client, GNUNET_NO); + h->client = NULL; + } + if (GNUNET_SCHEDULER_NO_TASK != h->reconnect_task) + { + GNUNET_SCHEDULER_cancel (h->reconnect_task); + h->reconnect_task = GNUNET_SCHEDULER_NO_TASK; + } + GNUNET_free(h); + h = NULL; +} + + +/** + * Store an item in the namestore. If the item is already present, + * the expiration time is updated to the max of the existing time and + * the new time. This API is used when we cache signatures from other + * authorities. + * + * @param h handle to the namestore + * @param zone_key public key of the zone + * @param name name that is being mapped (at most 255 characters long) + * @param expire when does the corresponding block in the DHT expire (until + * when should we never do a DHT lookup for the same name again)? + * @param rd_count number of entries in 'rd' array + * @param rd array of records with data to store + * @param signature signature for all the records in the zone under the given name + * @param cont continuation to call when done + * @param cont_cls closure for cont + * @return handle to abort the request + */ +struct GNUNET_NAMESTORE_QueueEntry * +GNUNET_NAMESTORE_record_put (struct GNUNET_NAMESTORE_Handle *h, + const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key, + const char *name, + struct GNUNET_TIME_Absolute expire, + unsigned int rd_count, + const struct GNUNET_NAMESTORE_RecordData *rd, + const struct GNUNET_CRYPTO_RsaSignature *signature, + GNUNET_NAMESTORE_ContinuationWithStatus cont, + void *cont_cls) +{ + struct GNUNET_NAMESTORE_QueueEntry *qe; + struct PendingMessage *pe; + + /* pointer to elements */ + struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *zone_key_tmp; + char * rd_tmp; + char * rd_ser; + char * name_tmp; + + size_t msg_size = 0; + size_t name_len = strlen(name) + 1; + size_t rd_ser_len = 0; + uint32_t id = 0; + + GNUNET_assert (NULL != h); + id = get_op_id(h); + qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry)); + qe->nsh = h; + qe->cont = cont; + qe->cont_cls = cont_cls; + qe->op_id = id; + GNUNET_CONTAINER_DLL_insert_tail(h->op_head, h->op_tail, qe); + + /* set msg_size*/ + rd_ser_len = GNUNET_NAMESTORE_records_serialize(&rd_ser, rd_count, rd); + + struct RecordPutMessage * msg; + msg_size = sizeof (struct RecordPutMessage) + sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded) + name_len + rd_ser_len; + + /* create msg here */ + pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size); + pe->size = msg_size; + pe->is_init = GNUNET_NO; + msg = (struct RecordPutMessage *) &pe[1]; + zone_key_tmp = (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *) &msg[1]; + name_tmp = (char *) &zone_key_tmp[1]; + rd_tmp = &name_tmp[name_len]; + + msg->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_PUT); + msg->header.size = htons (msg_size); + msg->op_id = htonl (id); + memcpy (zone_key_tmp, zone_key, sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded)); + msg->signature = *signature; + msg->name_len = htons (name_len); + memcpy (name_tmp, name, name_len); + msg->expire = GNUNET_TIME_absolute_hton (expire); + msg->rd_len = htons (rd_ser_len); + + memcpy (rd_tmp, rd_ser, rd_ser_len); + GNUNET_free (rd_ser); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message for name `%s' with size %u\n", "NAMESTORE_RECORD_PUT", name, msg_size); + + GNUNET_CONTAINER_DLL_insert_tail (h->pending_head, h->pending_tail, pe); + do_transmit(h); + + return qe; +} + + +/** + * Check if a signature is valid. This API is used by the GNS Block + * to validate signatures received from the network. + * + * @param public_key public key of the zone + * @param name name that is being mapped (at most 255 characters long) + * @param rd_count number of entries in 'rd' array + * @param rd array of records with data to store + * @param signature signature for all the records in the zone under the given name + * @return GNUNET_OK if the signature is valid + */ +int +GNUNET_NAMESTORE_verify_signature (const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key, + const char *name, + unsigned int rd_count, + const struct GNUNET_NAMESTORE_RecordData *rd, + const struct GNUNET_CRYPTO_RsaSignature *signature) +{ + return GNUNET_SYSERR; +} + +/** + * Store an item in the namestore. If the item is already present, + * the expiration time is updated to the max of the existing time and + * the new time. This API is used by the authority of a zone. + * + * @param h handle to the namestore + * @param pkey private key of the zone + * @param name name that is being mapped (at most 255 characters long) + * @param rd record data to store + * @param cont continuation to call when done + * @param cont_cls closure for cont + * @return handle to abort the request + */ +struct GNUNET_NAMESTORE_QueueEntry * +GNUNET_NAMESTORE_record_create (struct GNUNET_NAMESTORE_Handle *h, + const struct GNUNET_CRYPTO_RsaPrivateKey *pkey, + const char *name, + const struct GNUNET_NAMESTORE_RecordData *rd, + GNUNET_NAMESTORE_ContinuationWithStatus cont, + void *cont_cls) +{ + struct GNUNET_NAMESTORE_QueueEntry *qe; + struct PendingMessage *pe; + char * name_tmp; + char * rd_tmp; + char * rd_ser; + size_t rd_ser_len = 0; + size_t msg_size = 0; + size_t name_len = 0; + uint32_t id = 0; + + GNUNET_assert (NULL != h); + + id = get_op_id(h); + qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry)); + qe->nsh = h; + qe->cont = cont; + qe->cont_cls = cont_cls; + qe->op_id = id; + + /* set msg_size*/ + rd_ser_len = GNUNET_NAMESTORE_records_serialize(&rd_ser, 1, rd); + struct RecordCreateMessage * msg; + msg_size = sizeof (struct RecordCreateMessage) + name_len + rd_ser_len; + + /* create msg here */ + pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size); + pe->size = msg_size; + pe->is_init = GNUNET_NO; + msg = (struct RecordCreateMessage *) &pe[1]; + + name_tmp = (char *) &msg[1]; + rd_tmp = &name_tmp[name_len]; + + msg->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_CREATE); + msg->header.size = htons (msg_size); + msg->op_id = htonl (id); + //msg->signature = *signature; + msg->name_len = htons (name_len); + memcpy (name_tmp, name, name_len); + memcpy (rd_tmp, rd_ser, rd_ser_len); + GNUNET_free (rd_ser); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message for name `%s' with size %u\n", "NAMESTORE_RECORD_CREATE", name, msg_size); + + GNUNET_CONTAINER_DLL_insert_tail (h->pending_head, h->pending_tail, pe); + do_transmit(h); + return qe; +} + + +/** + * Explicitly remove some content from the database. The + * "cont"inuation will be called with status "GNUNET_OK" if content + * was removed, "GNUNET_NO" if no matching entry was found and + * "GNUNET_SYSERR" on all other types of errors. + * This API is used by the authority of a zone. + * + * @param h handle to the namestore + * @param pkey private key of the zone + * @param name name that is being mapped (at most 255 characters long) + * @param rd record data + * @param cont continuation to call when done + * @param cont_cls closure for cont + * @return handle to abort the request + */ +struct GNUNET_NAMESTORE_QueueEntry * +GNUNET_NAMESTORE_record_remove (struct GNUNET_NAMESTORE_Handle *h, + const struct GNUNET_CRYPTO_RsaPrivateKey *pkey, + const char *name, + const struct GNUNET_NAMESTORE_RecordData *rd, + GNUNET_NAMESTORE_ContinuationWithStatus cont, + void *cont_cls) +{ + struct GNUNET_NAMESTORE_QueueEntry *qe; + struct PendingMessage *pe; + char * rd_tmp; + char * rd_ser; + char * name_tmp; + size_t rd_ser_len = 0; + size_t msg_size = 0; + size_t name_len = 0; + uint32_t id = 0; + + GNUNET_assert (NULL != h); + + id = get_op_id(h); + qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry)); + qe->nsh = h; + qe->cont = cont; + qe->cont_cls = cont_cls; + qe->op_id = id; + + /* set msg_size*/ + rd_ser_len = GNUNET_NAMESTORE_records_serialize(&rd_ser, 1, rd); + struct RecordRemoveMessage * msg; + msg_size = sizeof (struct RecordRemoveMessage) + name_len + rd_ser_len; + + /* create msg here */ + pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size); + pe->size = msg_size; + pe->is_init = GNUNET_NO; + msg = (struct RecordRemoveMessage *) &pe[1]; + + name_tmp = (char *) &msg[1]; + rd_tmp = &name_tmp[name_len]; + + msg->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_RECORD_REMOVE); + msg->header.size = htons (msg_size); + msg->op_id = htonl (id); + //msg->signature = *signature; + msg->name_len = htons (name_len); + memcpy (name_tmp, name, name_len); + memcpy (rd_tmp, rd_ser, rd_ser_len); + GNUNET_free (rd_ser); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message for name `%s' with size %u\n", "NAMESTORE_RECORD_REMOVE", name, msg_size); + + GNUNET_CONTAINER_DLL_insert_tail (h->pending_head, h->pending_tail, pe); + do_transmit(h); + return qe; +} + + +/** + * Get a result for a particular key from the namestore. The processor + * will only be called once. + * + * @param h handle to the namestore + * @param zone zone to look up a record from + * @param name name to look up + * @param record_type desired record type, 0 for all + * @param proc function to call on the matching records, or with + * NULL (rd_count == 0) if there are no matching records + * @param proc_cls closure for proc + * @return a handle that can be used to + * cancel + */ +struct GNUNET_NAMESTORE_QueueEntry * +GNUNET_NAMESTORE_lookup_record (struct GNUNET_NAMESTORE_Handle *h, + const GNUNET_HashCode *zone, + const char *name, + uint32_t record_type, + GNUNET_NAMESTORE_RecordProcessor proc, void *proc_cls) +{ + struct GNUNET_NAMESTORE_QueueEntry *qe; + struct PendingMessage *pe; + size_t msg_size = 0; + size_t name_len = 0; + uint32_t id = 0; + + GNUNET_assert (NULL != h); + GNUNET_assert (NULL != zone); + GNUNET_assert (NULL != name); + + name_len = strlen (name) + 1; + if ((name_len == 0) || (name_len > 256)) + { + GNUNET_break (0); + return NULL; + } + + id = get_op_id(h); + qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry)); + qe->nsh = h; + qe->proc = proc; + qe->proc_cls = proc_cls; + qe->op_id = id; + GNUNET_CONTAINER_DLL_insert_tail(h->op_head, h->op_tail, qe); + + /* set msg_size*/ + msg_size = sizeof (struct LookupNameMessage) + name_len; + pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size); + + /* create msg here */ + struct LookupNameMessage * msg; + pe->size = msg_size; + pe->is_init = GNUNET_NO; + msg = (struct LookupNameMessage *) &pe[1]; + msg->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_LOOKUP_NAME); + msg->header.size = htons (msg_size); + msg->op_id = htonl (id); + msg->record_type = htonl (record_type); + msg->zone = *zone; + msg->name_len = htonl (name_len); + memcpy (&msg[1], name, name_len); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message for name `%s'\n", "NAMESTORE_LOOKUP_NAME", name); + + /* transmit message */ + GNUNET_CONTAINER_DLL_insert_tail (h->pending_head, h->pending_tail, pe); + do_transmit(h); + + return qe; +} + + + +/** + * Starts a new zone iteration (used to periodically PUT all of our + * records into our DHT). This MUST lock the GNUNET_NAMESTORE_Handle + * for any other calls than GNUNET_NAMESTORE_zone_iterator_next and + * GNUNET_NAMESTORE_zone_iteration_stop. "proc" will be called once + * immediately, and then again after + * "GNUNET_NAMESTORE_zone_iterator_next" is invoked. + * + * @param h handle to the namestore + * @param zone zone to access, NULL for all zones + * @param must_have_flags flags that must be set for the record to be returned + * @param must_not_have_flags flags that must NOT be set for the record to be returned + * @param proc function to call on each name from the zone; it + * will be called repeatedly with a value (if available) + * and always once at the end with a name of NULL. + * @param proc_cls closure for proc + * @return an iterator handle to use for iteration + */ +struct GNUNET_NAMESTORE_ZoneIterator * +GNUNET_NAMESTORE_zone_iteration_start (struct GNUNET_NAMESTORE_Handle *h, + const GNUNET_HashCode *zone, + enum GNUNET_NAMESTORE_RecordFlags must_have_flags, + enum GNUNET_NAMESTORE_RecordFlags must_not_have_flags, + GNUNET_NAMESTORE_RecordProcessor proc, + void *proc_cls) +{ + struct GNUNET_NAMESTORE_ZoneIterator *it; + struct PendingMessage *pe; + size_t msg_size = 0; + uint32_t id = 0; + + GNUNET_assert (NULL != h); + GNUNET_assert (NULL != zone); + + id = get_op_id(h); + it = GNUNET_malloc (sizeof (struct GNUNET_NAMESTORE_ZoneIterator)); + it->h = h; + it->proc = proc; + it->proc_cls = proc; + it->op_id = id; + it->zone = *zone; + GNUNET_CONTAINER_DLL_insert_tail(h->z_head, h->z_tail, it); + + /* set msg_size*/ + msg_size = sizeof (struct ZoneIterationStartMessage); + pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size); + + /* create msg here */ + struct ZoneIterationStartMessage * msg; + pe->size = msg_size; + pe->is_init = GNUNET_NO; + msg = (struct ZoneIterationStartMessage *) &pe[1]; + msg->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_START); + msg->header.size = htons (msg_size); + msg->op_id = htonl (id); + msg->zone = *zone; + msg->must_have_flags = ntohs (must_have_flags); + msg->must_not_have_flags = ntohs (must_not_have_flags); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message for zone `%s'\n", "ZONE_ITERATION_START", GNUNET_h2s(zone)); + + /* transmit message */ + GNUNET_CONTAINER_DLL_insert_tail (h->pending_head, h->pending_tail, pe); + do_transmit(h); + + return it; +} + + +/** + * Calls the record processor specified in GNUNET_NAMESTORE_zone_iteration_start + * for the next record. + * + * @param it the iterator + */ +void +GNUNET_NAMESTORE_zone_iterator_next (struct GNUNET_NAMESTORE_ZoneIterator *it) +{ + struct GNUNET_NAMESTORE_Handle *h; + struct PendingMessage *pe; + size_t msg_size = 0; + + GNUNET_assert (NULL != it); + h = it->h; + + /* set msg_size*/ + msg_size = sizeof (struct ZoneIterationNextMessage); + pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size); + + /* create msg here */ + struct ZoneIterationNextMessage * msg; + pe->size = msg_size; + pe->is_init = GNUNET_NO; + msg = (struct ZoneIterationNextMessage *) &pe[1]; + msg->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_NEXT); + msg->header.size = htons (msg_size); + msg->op_id = htonl (it->op_id); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message for name `%s'\n", "ZONE_ITERATION_NEXT", GNUNET_h2s(&it->zone)); + + /* transmit message */ + GNUNET_CONTAINER_DLL_insert_tail (h->pending_head, h->pending_tail, pe); + do_transmit(h); +} + + +/** + * Stops iteration and releases the namestore handle for further calls. + * + * @param it the iterator + */ +void +GNUNET_NAMESTORE_zone_iteration_stop (struct GNUNET_NAMESTORE_ZoneIterator *it) +{ + GNUNET_assert (NULL != it); + struct PendingMessage *pe; + size_t msg_size = 0; + struct GNUNET_NAMESTORE_Handle *h = it->h; + + /* set msg_size*/ + msg_size = sizeof (struct ZoneIterationStopMessage); + pe = GNUNET_malloc(sizeof (struct PendingMessage) + msg_size); + + /* create msg here */ + struct ZoneIterationStopMessage * msg; + pe->size = msg_size; + pe->is_init = GNUNET_NO; + msg = (struct ZoneIterationStopMessage *) &pe[1]; + msg->header.type = htons (GNUNET_MESSAGE_TYPE_NAMESTORE_ZONE_ITERATION_STOP); + msg->header.size = htons (msg_size); + msg->op_id = htonl (it->op_id); + + GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending `%s' message for name `%s'\n", "ZONE_ITERATION_STOP", GNUNET_h2s(&it->zone)); + + /* transmit message */ + GNUNET_CONTAINER_DLL_insert_tail (h->pending_head, h->pending_tail, pe); + do_transmit(h); +} + + +/** + * Cancel a namestore operation. The final callback from the + * operation must not have been done yet. + * + * @param qe operation to cancel + */ +void +GNUNET_NAMESTORE_cancel (struct GNUNET_NAMESTORE_QueueEntry *qe) +{ + struct GNUNET_NAMESTORE_Handle *h = qe->nsh; + + GNUNET_assert (qe != NULL); + + GNUNET_CONTAINER_DLL_remove(h->op_head, h->op_tail, qe); + GNUNET_free(qe); + +} + +/* end of namestore_api.c */ |