/*
This file is part of GNUnet
- (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Christian Grothoff (and other contributing authors)
+ (C) 2003-2013 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 2, or (at your
+ 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
/**
* @file fs/fs_namespace.c
- * @brief create and destroy namespaces
+ * @brief publishing to namespaces, and tracking updateable entries
+ * for our namespaces
* @author Christian Grothoff
*/
#include "platform.h"
#include "gnunet_signatures.h"
#include "gnunet_util_lib.h"
#include "gnunet_fs_service.h"
-#include "fs.h"
-
-/**
- * Return the name of the directory in which we store
- * our local namespaces (or rather, their public keys).
- *
- * @param h global fs handle
- * @return NULL on error, otherwise the name of the directory
- */
-static char *
-get_namespace_directory (struct GNUNET_FS_Handle *h)
-{
- char *dn;
-
- if (GNUNET_OK !=
- GNUNET_CONFIGURATION_get_value_filename (h->cfg,
- "FS",
- "IDENTITY_DIR",
- &dn))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Configuration fails to specify `%s' in section `%s'\n"),
- "IDENTITY_DIR",
- "fs");
- return NULL;
- }
- return dn;
-}
+#include "fs_api.h"
+#include "fs_publish_ublock.h"
/**
- * Context for advertising a namespace.
+ * Information about an (updateable) node in the
+ * namespace.
*/
-struct AdvertisementContext
+struct NamespaceUpdateNode
{
/**
- * Function to call with the result.
+ * Identifier for this node.
*/
- GNUNET_FS_PublishContinuation cont;
+ char *id;
/**
- * Closure for cont.
+ * Identifier of children of this node.
*/
- void *cont_cls;
+ char *update;
/**
- * Datastore handle.
+ * Metadata for this entry.
*/
- struct GNUNET_DATASTORE_Handle *dsh;
+ struct GNUNET_CONTAINER_MetaData *md;
/**
- * Our KSK URI.
- */
- struct GNUNET_FS_Uri *ksk_uri;
+ * URI of this entry in the namespace.
+ */
+ struct GNUNET_FS_Uri *uri;
/**
- * Plaintext.
+ * Namespace update generation ID. Used to ensure
+ * freshness of the tree_id.
*/
- char *pt;
+ unsigned int nug;
/**
- * NBlock to sign and store.
+ * TREE this entry belongs to (if nug is current).
*/
- struct NBlock *nb;
+ unsigned int tree_id;
+
+};
+
+
+/**
+ * Handle to update information for a namespace.
+ */
+struct GNUNET_FS_UpdateInformationGraph
+{
/**
- * The namespace.
+ * Handle to the FS service context.
*/
- struct GNUNET_FS_Namespace *ns;
+ struct GNUNET_FS_Handle *h;
/**
- * Expiration time.
+ * Array with information about nodes in the namespace.
*/
- struct GNUNET_TIME_Absolute expiration;
+ struct NamespaceUpdateNode **update_nodes;
/**
- * Number of bytes of plaintext.
- */
- size_t pt_size;
+ * Private key for the namespace.
+ */
+ struct GNUNET_CRYPTO_EccPrivateKey ns;
/**
- * Anonymity level.
+ * Hash map mapping identifiers of update nodes
+ * to the update nodes (initialized on-demand).
*/
- uint32_t anonymity;
+ struct GNUNET_CONTAINER_MultiHashMap *update_map;
/**
- * Content priority.
+ * Size of the update nodes array.
*/
- uint32_t priority;
+ unsigned int update_node_count;
/**
- * Current keyword offset.
+ * Reference counter.
*/
- unsigned int pos;
+ unsigned int rc;
+
+ /**
+ * Generator for unique nug numbers.
+ */
+ unsigned int nug_gen;
};
/**
- * Continuation called to notify client about result of the
- * operation.
+ * Return the name of the directory in which we store
+ * the update information graph for the given local namespace.
*
- * @param cls closure (our struct AdvertismentContext)
- * @param success GNUNET_SYSERR on failure
- * @param msg NULL on success, otherwise an error message
+ * @param h file-sharing handle
+ * @param ns namespace handle
+ * @return NULL on error, otherwise the name of the directory
+ */
+static char *
+get_update_information_directory (struct GNUNET_FS_Handle *h,
+ const struct GNUNET_CRYPTO_EccPrivateKey *ns)
+{
+ char *dn;
+ char *ret;
+ struct GNUNET_CRYPTO_EccPublicSignKey pub;
+ struct GNUNET_HashCode hc;
+ struct GNUNET_CRYPTO_HashAsciiEncoded enc;
+
+ if (GNUNET_OK !=
+ GNUNET_CONFIGURATION_get_value_filename (h->cfg, "FS", "UPDATE_DIR",
+ &dn))
+ {
+ GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
+ "fs", "UPDATE_DIR");
+ return NULL;
+ }
+ GNUNET_CRYPTO_ecc_key_get_public_for_signature (ns, &pub);
+ GNUNET_CRYPTO_hash (&pub, sizeof (pub), &hc);
+ GNUNET_CRYPTO_hash_to_enc (&hc,
+ &enc);
+ GNUNET_asprintf (&ret, "%s%s%s",
+ dn,
+ DIR_SEPARATOR_STR,
+ (const char *) enc.encoding);
+ GNUNET_free (dn);
+ return ret;
+}
+
+
+/**
+ * Release memory occupied by UIG datastructure.
+ *
+ * @param uig data structure to free
*/
static void
-advertisement_cont (void *cls,
- int success,
- const char *msg)
+free_update_information_graph (struct GNUNET_FS_UpdateInformationGraph *uig)
{
- struct AdvertisementContext *ac = cls;
- const char *keyword;
- GNUNET_HashCode key;
- GNUNET_HashCode query;
- struct GNUNET_CRYPTO_AesSessionKey skey;
- struct GNUNET_CRYPTO_AesInitializationVector iv;
- struct GNUNET_CRYPTO_RsaPrivateKey *pk;
-
- if (GNUNET_OK != success)
- {
- /* error! */
- GNUNET_DATASTORE_disconnect (ac->dsh, GNUNET_NO);
- ac->cont (ac->cont_cls, NULL, msg);
- GNUNET_FS_uri_destroy (ac->ksk_uri);
- GNUNET_free (ac->pt);
- GNUNET_free (ac->nb);
- GNUNET_FS_namespace_delete (ac->ns, GNUNET_NO);
- GNUNET_free (ac);
- return;
- }
- if (ac->pos == ac->ksk_uri->data.ksk.keywordCount)
- {
- /* done! */
- GNUNET_DATASTORE_disconnect (ac->dsh, GNUNET_NO);
- ac->cont (ac->cont_cls, ac->ksk_uri, NULL);
- GNUNET_FS_uri_destroy (ac->ksk_uri);
- GNUNET_free (ac->pt);
- GNUNET_free (ac->nb);
- GNUNET_FS_namespace_delete (ac->ns, GNUNET_NO);
- GNUNET_free (ac);
- return;
- }
- keyword = ac->ksk_uri->data.ksk.keywords[ac->pos++];
- /* first character of keyword indicates if it is
- mandatory or not -- ignore for hashing */
- GNUNET_CRYPTO_hash (&keyword[1], strlen (&keyword[1]), &key);
- GNUNET_CRYPTO_hash_to_aes_key (&key, &skey, &iv);
- GNUNET_CRYPTO_aes_encrypt (ac->pt,
- ac->pt_size,
- &skey,
- &iv,
- &ac->nb[1]);
- GNUNET_break (GNUNET_OK ==
- GNUNET_CRYPTO_rsa_sign (ac->ns->key,
- &ac->nb->ns_purpose,
- &ac->nb->ns_signature));
- pk = GNUNET_CRYPTO_rsa_key_create_from_hash (&key);
- GNUNET_CRYPTO_rsa_key_get_public (pk, &ac->nb->keyspace);
- GNUNET_CRYPTO_hash (&ac->nb->keyspace,
- sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
- &query);
- GNUNET_break (GNUNET_OK ==
- GNUNET_CRYPTO_rsa_sign (pk,
- &ac->nb->ksk_purpose,
- &ac->nb->ksk_signature));
- GNUNET_CRYPTO_rsa_key_free (pk);
- GNUNET_DATASTORE_put (ac->dsh,
- 0 /* no reservation */,
- &query,
- ac->pt_size + sizeof (struct NBlock),
- ac->nb,
- GNUNET_DATASTORE_BLOCKTYPE_NBLOCK,
- ac->priority,
- ac->anonymity,
- ac->expiration,
- GNUNET_CONSTANTS_SERVICE_TIMEOUT,
- &advertisement_cont,
- ac);
+ unsigned int i;
+ struct NamespaceUpdateNode *nsn;
+
+ for (i = 0; i < uig->update_node_count; i++)
+ {
+ nsn = uig->update_nodes[i];
+ GNUNET_CONTAINER_meta_data_destroy (nsn->md);
+ GNUNET_FS_uri_destroy (nsn->uri);
+ GNUNET_free (nsn->id);
+ GNUNET_free (nsn->update);
+ GNUNET_free (nsn);
+ }
+ GNUNET_array_grow (uig->update_nodes, uig->update_node_count,
+ 0);
+ if (NULL != uig->update_map)
+ GNUNET_CONTAINER_multihashmap_destroy (uig->update_map);
+ GNUNET_free (uig);
}
/**
- * Publish an advertismement for a namespace.
+ * Write a namespace's update node graph to a file.
*
- * @param h handle to the file sharing subsystem
- * @param ksk_uri keywords to use for advertisment
- * @param namespace handle for the namespace that should be advertised
- * @param meta meta-data for the namespace advertisement
- * @param anonymity for the namespace advertismement
- * @param priority for the namespace advertisement
- * @param expiration for the namespace advertisement
- * @param rootEntry name of the root of the namespace
- * @param cont continuation
- * @param cont_cls closure for cont
+ * @param uig update information graph to dump
*/
-void
-GNUNET_FS_namespace_advertise (struct GNUNET_FS_Handle *h,
- struct GNUNET_FS_Uri *ksk_uri,
- struct GNUNET_FS_Namespace *namespace,
- const struct GNUNET_CONTAINER_MetaData *meta,
- uint32_t anonymity,
- uint32_t priority,
- struct GNUNET_TIME_Absolute expiration,
- const char *rootEntry,
- GNUNET_FS_PublishContinuation cont,
- void *cont_cls)
+static void
+write_update_information_graph (struct GNUNET_FS_UpdateInformationGraph *uig)
{
- size_t reslen;
- size_t size;
- ssize_t mdsize;
- struct NBlock *nb;
- char *mdst;
- struct GNUNET_DATASTORE_Handle *dsh;
- struct AdvertisementContext *ctx;
- char *pt;
-
- /* create advertisements */
- mdsize = GNUNET_CONTAINER_meta_data_get_serialized_size (meta);
- if (-1 == mdsize)
- {
- cont (cont_cls, NULL, _("Failed to serialize meta data"));
- return;
- }
- reslen = strlen (rootEntry) + 1;
- size = mdsize + sizeof (struct NBlock) + reslen;
- if (size > MAX_NBLOCK_SIZE)
+ char *fn;
+ struct GNUNET_BIO_WriteHandle *wh;
+ unsigned int i;
+ struct NamespaceUpdateNode *n;
+ char *uris;
+
+ fn = get_update_information_directory (uig->h,
+ &uig->ns);
+ wh = GNUNET_BIO_write_open (fn);
+ if (NULL == wh)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
+ _("Failed to open `%s' for writing: %s\n"), STRERROR (errno));
+ GNUNET_free (fn);
+ return;
+ }
+ if (GNUNET_OK != GNUNET_BIO_write_int32 (wh, uig->update_node_count))
+ goto END;
+ for (i = 0; i < uig->update_node_count; i++)
+ {
+ n = uig->update_nodes[i];
+ uris = GNUNET_FS_uri_to_string (n->uri);
+ if ((GNUNET_OK != GNUNET_BIO_write_string (wh, n->id)) ||
+ (GNUNET_OK != GNUNET_BIO_write_meta_data (wh, n->md)) ||
+ (GNUNET_OK != GNUNET_BIO_write_string (wh, n->update)) ||
+ (GNUNET_OK != GNUNET_BIO_write_string (wh, uris)))
{
- size = MAX_NBLOCK_SIZE;
- mdsize = size - sizeof (struct NBlock) - reslen;
+ GNUNET_free (uris);
+ break;
}
+ GNUNET_free (uris);
+ }
+END:
+ if (GNUNET_OK != GNUNET_BIO_write_close (wh))
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Failed to write `%s': %s\n"),
+ STRERROR (errno));
+ GNUNET_free (fn);
+}
+
- pt = GNUNET_malloc (mdsize + reslen);
- memcpy (pt, rootEntry, reslen);
- mdst = &pt[reslen];
- mdsize = GNUNET_CONTAINER_meta_data_serialize (meta,
- &mdst,
- mdsize,
- GNUNET_CONTAINER_META_DATA_SERIALIZE_PART);
- if (mdsize == -1)
+/**
+ * Read the namespace update node graph from a file.
+ *
+ * @param h FS handle to use
+ * @param ns namespace to read
+ * @return update graph, never NULL
+ */
+static struct GNUNET_FS_UpdateInformationGraph *
+read_update_information_graph (struct GNUNET_FS_Handle *h,
+ const struct GNUNET_CRYPTO_EccPrivateKey *ns)
+{
+ struct GNUNET_FS_UpdateInformationGraph *uig;
+ char *fn;
+ struct GNUNET_BIO_ReadHandle *rh;
+ unsigned int i;
+ struct NamespaceUpdateNode *n;
+ char *uris;
+ uint32_t count;
+ char *emsg;
+
+ uig = GNUNET_new (struct GNUNET_FS_UpdateInformationGraph);
+ uig->h = h;
+ uig->ns = *ns;
+ fn = get_update_information_directory (h, ns);
+ if (GNUNET_YES != GNUNET_DISK_file_test (fn))
+ {
+ GNUNET_free (fn);
+ return uig;
+ }
+ rh = GNUNET_BIO_read_open (fn);
+ if (NULL == rh)
+ {
+ GNUNET_free (fn);
+ return uig;
+ }
+ if (GNUNET_OK != GNUNET_BIO_read_int32 (rh, &count))
+ {
+ GNUNET_break (0);
+ goto END;
+ }
+ if (count > 1024 * 1024)
+ {
+ GNUNET_break (0);
+ goto END;
+ }
+ if (0 == count)
+ goto END;
+ uig->update_nodes =
+ GNUNET_malloc (count * sizeof (struct NamespaceUpdateNode *));
+
+ for (i = 0; i < count; i++)
+ {
+ n = GNUNET_new (struct NamespaceUpdateNode);
+ if ((GNUNET_OK != GNUNET_BIO_read_string (rh, "identifier", &n->id, 1024))
+ || (GNUNET_OK != GNUNET_BIO_read_meta_data (rh, "meta", &n->md)) ||
+ (GNUNET_OK !=
+ GNUNET_BIO_read_string (rh, "update-id", &n->update, 1024)) ||
+ (GNUNET_OK != GNUNET_BIO_read_string (rh, "uri", &uris, 1024 * 2)))
{
GNUNET_break (0);
- GNUNET_free (pt);
- cont (cont_cls, NULL, _("Failed to serialize meta data"));
- return;
+ GNUNET_free_non_null (n->id);
+ GNUNET_free_non_null (n->update);
+ if (n->md != NULL)
+ GNUNET_CONTAINER_meta_data_destroy (n->md);
+ GNUNET_free (n);
+ break;
}
- size = mdsize + sizeof (struct NBlock) + reslen;
- nb = GNUNET_malloc (size);
- GNUNET_CRYPTO_rsa_key_get_public (namespace->key,
- &nb->subspace);
- nb->ns_purpose.size = htonl (mdsize + reslen +
- sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
- sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
- nb->ns_purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_FS_NBLOCK);
- nb->ksk_purpose.size = htonl (size - sizeof (struct GNUNET_CRYPTO_RsaSignature));
- nb->ksk_purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_FS_NBLOCK_KSIG);
- dsh = GNUNET_DATASTORE_connect (h->cfg, h->sched);
- if (NULL == dsh)
+ n->uri = GNUNET_FS_uri_parse (uris, &emsg);
+ GNUNET_free (uris);
+ if (n->uri == NULL)
{
- GNUNET_free (nb);
- GNUNET_free (pt);
- cont (cont_cls, NULL, _("Failed to connect to datastore service"));
- return;
- }
- ctx = GNUNET_malloc (sizeof (struct AdvertisementContext));
- ctx->cont = cont;
- ctx->cont_cls = cont_cls;
- ctx->dsh = dsh;
- ctx->ksk_uri = GNUNET_FS_uri_dup (ksk_uri);
- ctx->nb = nb;
- ctx->pt = pt;
- ctx->pt_size = mdsize + reslen;
- ctx->ns = namespace;
- ctx->ns->rc++;
- ctx->anonymity = anonymity;
- ctx->priority = priority;
- ctx->expiration = expiration;
- advertisement_cont (ctx, GNUNET_OK, NULL);
+ GNUNET_break (0);
+ GNUNET_free (emsg);
+ GNUNET_free (n->id);
+ GNUNET_free_non_null (n->update);
+ GNUNET_CONTAINER_meta_data_destroy (n->md);
+ GNUNET_free (n);
+ break;
+ }
+ uig->update_nodes[i] = n;
+ }
+ uig->update_node_count = i;
+ END:
+ if (GNUNET_OK != GNUNET_BIO_read_close (rh, &emsg))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Failed to read `%s': %s\n"),
+ fn, emsg);
+ GNUNET_free (emsg);
+ }
+ GNUNET_free (fn);
+ return uig;
}
/**
- * Create a namespace with the given name; if one already
- * exists, return a handle to the existing namespace.
+ * Context for the SKS publication.
+ */
+struct GNUNET_FS_PublishSksContext
+{
+
+ /**
+ * URI of the new entry in the namespace.
+ */
+ struct GNUNET_FS_Uri *uri;
+
+ /**
+ * Namespace update node to add to namespace on success (or to be
+ * deleted if publishing failed).
+ */
+ struct NamespaceUpdateNode *nsn;
+
+ /**
+ * Namespace we're publishing to.
+ */
+ struct GNUNET_CRYPTO_EccPrivateKey ns;
+
+ /**
+ * Handle to the datastore.
+ */
+ struct GNUNET_DATASTORE_Handle *dsh;
+
+ /**
+ * Handle to FS.
+ */
+ struct GNUNET_FS_Handle *h;
+
+ /**
+ * Function to call once we're done.
+ */
+ GNUNET_FS_PublishContinuation cont;
+
+ /**
+ * Closure for cont.
+ */
+ void *cont_cls;
+
+ /**
+ * Handle for our UBlock operation request.
+ */
+ struct GNUNET_FS_PublishUblockContext *uc;
+};
+
+
+/**
+ * Function called by the UBlock construction with
+ * the result from the PUT (UBlock) request.
+ *
+ * @param cls closure of type "struct GNUNET_FS_PublishSksContext*"
+ * @param msg error message (or NULL)
+ */
+static void
+sks_publish_cont (void *cls,
+ const char *msg)
+{
+ struct GNUNET_FS_PublishSksContext *psc = cls;
+ struct GNUNET_FS_UpdateInformationGraph *uig;
+
+ psc->uc = NULL;
+ if (NULL != msg)
+ {
+ if (NULL != psc->cont)
+ psc->cont (psc->cont_cls, NULL, msg);
+ GNUNET_FS_publish_sks_cancel (psc);
+ return;
+ }
+ if (NULL != psc->nsn)
+ {
+ /* FIXME: this can be done much more
+ * efficiently by simply appending to the
+ * file and overwriting the 4-byte header */
+ uig = read_update_information_graph (psc->h,
+ &psc->ns);
+ GNUNET_array_append (uig->update_nodes,
+ uig->update_node_count,
+ psc->nsn);
+ psc->nsn = NULL;
+ write_update_information_graph (uig);
+ free_update_information_graph (uig);
+ }
+ if (NULL != psc->cont)
+ psc->cont (psc->cont_cls, psc->uri, NULL);
+ GNUNET_FS_publish_sks_cancel (psc);
+}
+
+
+/**
+ * Publish an SBlock on GNUnet.
*
* @param h handle to the file sharing subsystem
- * @param name name to use for the namespace
- * @return handle to the namespace, NULL on error
+ * @param ns namespace to publish in
+ * @param identifier identifier to use
+ * @param update update identifier to use
+ * @param meta metadata to use
+ * @param uri URI to refer to in the SBlock
+ * @param bo block options
+ * @param options publication options
+ * @param cont continuation
+ * @param cont_cls closure for cont
+ * @return NULL on error ('cont' will still be called)
*/
-struct GNUNET_FS_Namespace *
-GNUNET_FS_namespace_create (struct GNUNET_FS_Handle *h,
- const char *name)
+struct GNUNET_FS_PublishSksContext *
+GNUNET_FS_publish_sks (struct GNUNET_FS_Handle *h,
+ const struct GNUNET_CRYPTO_EccPrivateKey *ns,
+ const char *identifier, const char *update,
+ const struct GNUNET_CONTAINER_MetaData *meta,
+ const struct GNUNET_FS_Uri *uri,
+ const struct GNUNET_FS_BlockOptions *bo,
+ enum GNUNET_FS_PublishOptions options,
+ GNUNET_FS_PublishContinuation cont, void *cont_cls)
{
- char *dn;
- char *fn;
- struct GNUNET_FS_Namespace *ret;
-
- dn = get_namespace_directory (h);
- GNUNET_asprintf (&fn,
- "%s%s%s",
- dn,
- DIR_SEPARATOR_STR,
- name);
- GNUNET_free (dn);
- ret = GNUNET_malloc (sizeof (struct GNUNET_FS_Namespace));
- ret->rc = 1;
- ret->key = GNUNET_CRYPTO_rsa_key_create_from_file (fn);
- if (ret->key == NULL)
+ struct GNUNET_FS_PublishSksContext *psc;
+ struct GNUNET_FS_Uri *sks_uri;
+
+ sks_uri = GNUNET_new (struct GNUNET_FS_Uri);
+ sks_uri->type = GNUNET_FS_URI_SKS;
+ sks_uri->data.sks.identifier = GNUNET_strdup (identifier);
+ GNUNET_CRYPTO_ecc_key_get_public_for_signature (ns,
+ &sks_uri->data.sks.ns);
+
+ psc = GNUNET_new (struct GNUNET_FS_PublishSksContext);
+ psc->h = h;
+ psc->uri = sks_uri;
+ psc->cont = cont;
+ psc->cont_cls = cont_cls;
+ psc->ns = *ns;
+ if (0 == (options & GNUNET_FS_PUBLISH_OPTION_SIMULATE_ONLY))
+ {
+ psc->dsh = GNUNET_DATASTORE_connect (h->cfg);
+ if (NULL == psc->dsh)
{
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to create or read private key for namespace `%s'\n"),
- name);
- GNUNET_free (ret);
- GNUNET_free (fn);
+ sks_publish_cont (psc,
+ _("Failed to connect to datastore."));
return NULL;
}
- ret->filename = fn;
- return ret;
+ }
+ if (NULL != update)
+ {
+ psc->nsn = GNUNET_new (struct NamespaceUpdateNode);
+ psc->nsn->id = GNUNET_strdup (identifier);
+ psc->nsn->update = GNUNET_strdup (update);
+ psc->nsn->md = GNUNET_CONTAINER_meta_data_duplicate (meta);
+ psc->nsn->uri = GNUNET_FS_uri_dup (uri);
+ }
+ psc->uc = GNUNET_FS_publish_ublock_ (h,
+ psc->dsh,
+ identifier,
+ update,
+ ns,
+ meta,
+ uri,
+ bo,
+ options,
+ &sks_publish_cont,
+ psc);
+ return psc;
}
/**
- * Delete a namespace handle. Can be used for a clean shutdown (free
- * memory) or also to freeze the namespace to prevent further
- * insertions by anyone.
+ * Abort the SKS publishing operation.
*
- * @param namespace handle to the namespace that should be deleted / freed
- * @param freeze prevents future insertions; creating a namespace
- * with the same name again will create a fresh namespace instead
+ * @param psc context of the operation to abort.
+ */
+void
+GNUNET_FS_publish_sks_cancel (struct GNUNET_FS_PublishSksContext *psc)
+{
+ if (NULL != psc->uc)
+ {
+ GNUNET_FS_publish_ublock_cancel_ (psc->uc);
+ psc->uc = NULL;
+ }
+ if (NULL != psc->dsh)
+ {
+ GNUNET_DATASTORE_disconnect (psc->dsh, GNUNET_NO);
+ psc->dsh = NULL;
+ }
+ GNUNET_FS_uri_destroy (psc->uri);
+ if (NULL != psc->nsn)
+ {
+ GNUNET_CONTAINER_meta_data_destroy (psc->nsn->md);
+ GNUNET_FS_uri_destroy (psc->nsn->uri);
+ GNUNET_free (psc->nsn->id);
+ GNUNET_free (psc->nsn->update);
+ GNUNET_free (psc->nsn);
+ }
+ GNUNET_free (psc);
+}
+
+
+/**
+ * Closure for 'process_update_node'.
+ */
+struct ProcessUpdateClosure
+{
+ /**
+ * Function to call for each node.
+ */
+ GNUNET_FS_IdentifierProcessor ip;
+
+ /**
+ * Closure for 'ip'.
+ */
+ void *ip_cls;
+};
+
+
+/**
+ * Call the iterator in the closure for each node.
*
- * @return GNUNET_OK on success, GNUNET_SYSERR on error
+ * @param cls closure (of type 'struct ProcessUpdateClosure *')
+ * @param key current key code
+ * @param value value in the hash map (of type 'struct NamespaceUpdateNode *')
+ * @return GNUNET_YES if we should continue to
+ * iterate,
+ * GNUNET_NO if not.
*/
-int
-GNUNET_FS_namespace_delete (struct GNUNET_FS_Namespace *namespace,
- int freeze)
+static int
+process_update_node (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
{
- namespace->rc--;
- if (freeze)
- {
- if (0 != UNLINK (namespace->filename))
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
- "unlink",
- namespace->filename);
- }
- if (0 == namespace->rc)
- {
- GNUNET_CRYPTO_rsa_key_free (namespace->key);
- GNUNET_free (namespace->filename);
- GNUNET_free (namespace);
- }
- return GNUNET_OK;
+ struct ProcessUpdateClosure *pc = cls;
+ struct NamespaceUpdateNode *nsn = value;
+
+ pc->ip (pc->ip_cls,
+ nsn->id,
+ nsn->uri,
+ nsn->md,
+ nsn->update);
+ return GNUNET_YES;
}
/**
- * Context for the 'process_namespace' callback.
- * Specifies a function to call on each namespace.
+ * Closure for 'find_trees'.
*/
-struct ProcessNamespaceContext
+struct FindTreeClosure
{
/**
- * Function to call.
+ * UIG we are operating on.
+ */
+ struct GNUNET_FS_UpdateInformationGraph *uig;
+
+ /**
+ * Array with 'head's of TREEs.
+ */
+ struct NamespaceUpdateNode **tree_array;
+
+ /**
+ * Size of 'tree_array'
+ */
+ unsigned int tree_array_size;
+
+ /**
+ * Current generational ID used.
*/
- GNUNET_FS_NamespaceInfoProcessor cb;
+ unsigned int nug;
/**
- * Closure for 'cb'.
+ * Identifier for the current TREE, or UINT_MAX for none yet.
*/
- void *cb_cls;
+ unsigned int id;
};
/**
- * Function called with a filename of a namespace. Reads the key and
- * calls the callback.
+ * Find all nodes reachable from the current node (including the
+ * current node itself). If they are in no tree, add them to the
+ * current one. If they are the head of another tree, merge the
+ * trees. If they are in the middle of another tree, let them be.
+ * We can tell that a node is already in an tree by checking if
+ * its 'nug' field is set to the current 'nug' value. It is the
+ * head of an tree if it is in the 'tree_array' under its respective
+ * 'tree_id'.
+ *
+ * In short, we're trying to find the smallest number of tree to
+ * cover a directed graph.
*
- * @param cls closure (struct ProcessNamespaceContext)
- * @param filename complete filename (absolute path)
- * @return GNUNET_OK to continue to iterate,
- * GNUNET_SYSERR to abort iteration with error!
+ * @param cls closure (of type 'struct FindTreeClosure')
+ * @param key current key code
+ * @param value value in the hash map
+ * @return GNUNET_YES if we should continue to
+ * iterate,
+ * GNUNET_NO if not.
*/
static int
-process_namespace (void *cls,
- const char *filename)
+find_trees (void *cls,
+ const struct GNUNET_HashCode *key,
+ void *value)
{
- struct ProcessNamespaceContext *pnc = cls;
- struct GNUNET_CRYPTO_RsaPrivateKey *key;
- struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pk;
- GNUNET_HashCode id;
- const char *name;
- const char *t;
-
- key = GNUNET_CRYPTO_rsa_key_create_from_file (filename);
- if (key == NULL)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
- _("Failed to read namespace private key file `%s', deleting it!\n"),
- filename);
- if (0 != UNLINK (filename))
- GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
- "unlink",
- filename);
- return GNUNET_OK;
- }
- GNUNET_CRYPTO_rsa_key_get_public (key, &pk);
- GNUNET_CRYPTO_rsa_key_free (key);
- GNUNET_CRYPTO_hash (&pk, sizeof(pk), &id);
- name = filename;
- while (NULL != (t = strstr (name, DIR_SEPARATOR_STR)))
- name = t + 1;
- pnc->cb (pnc->cb_cls,
- name,
- &id);
- return GNUNET_OK;
+ struct FindTreeClosure *fc = cls;
+ struct NamespaceUpdateNode *nsn = value;
+ struct GNUNET_HashCode hc;
+
+ if (nsn->nug == fc->nug)
+ {
+ if (UINT_MAX == nsn->tree_id)
+ return GNUNET_YES; /* circular */
+ GNUNET_assert (nsn->tree_id < fc->tree_array_size);
+ if (fc->tree_array[nsn->tree_id] != nsn)
+ return GNUNET_YES; /* part of "another" (directed) TREE,
+ * and not root of it, end trace */
+ if (nsn->tree_id == fc->id)
+ return GNUNET_YES; /* that's our own root (can this be?) */
+ /* merge existing TREE, we have a root for both */
+ fc->tree_array[nsn->tree_id] = NULL;
+ if (UINT_MAX == fc->id)
+ fc->id = nsn->tree_id; /* take over ID */
+ }
+ else
+ {
+ nsn->nug = fc->nug;
+ nsn->tree_id = UINT_MAX; /* mark as undef */
+ /* trace */
+ GNUNET_CRYPTO_hash (nsn->update, strlen (nsn->update), &hc);
+ GNUNET_CONTAINER_multihashmap_get_multiple (fc->uig->update_map, &hc,
+ &find_trees, fc);
+ }
+ return GNUNET_YES;
}
/**
- * Build a list of all available local (!) namespaces The returned
- * names are only the nicknames since we only iterate over the local
- * namespaces.
+ * List all of the identifiers in the namespace for which we could
+ * produce an update. Namespace updates form a graph where each node
+ * has a name. Each node can have any number of URI/meta-data entries
+ * which can each be linked to other nodes. Cycles are possible.
*
- * @param h handle to the file sharing subsystem
- * @param cb function to call on each known namespace
- * @param cb_cls closure for cb
+ * Calling this function with "next_id" NULL will cause the library to
+ * call "ip" with a root for each strongly connected component of the
+ * graph (a root being a node from which all other nodes in the Tree
+ * are reachable).
+ *
+ * Calling this function with "next_id" being the name of a node will
+ * cause the library to call "ip" with all children of the node. Note
+ * that cycles within the final tree are possible (including self-loops).
+ * I know, odd definition of a tree, but the GUI will display an actual
+ * tree (GtkTreeView), so that's what counts for the term here.
+ *
+ * @param h fs handle to use
+ * @param ns namespace to inspect for updateable content
+ * @param next_id ID to look for; use NULL to look for tree roots
+ * @param ip function to call on each updateable identifier
+ * @param ip_cls closure for ip
*/
-void
-GNUNET_FS_namespace_list (struct GNUNET_FS_Handle *h,
- GNUNET_FS_NamespaceInfoProcessor cb,
- void *cb_cls)
+void
+GNUNET_FS_namespace_list_updateable (struct GNUNET_FS_Handle *h,
+ const struct GNUNET_CRYPTO_EccPrivateKey *ns,
+ const char *next_id,
+ GNUNET_FS_IdentifierProcessor ip,
+ void *ip_cls)
{
- char *dn;
- struct ProcessNamespaceContext ctx;
-
- dn = get_namespace_directory (h);
- if (dn == NULL)
+ unsigned int i;
+ unsigned int nug;
+ struct GNUNET_HashCode hc;
+ struct NamespaceUpdateNode *nsn;
+ struct ProcessUpdateClosure pc;
+ struct FindTreeClosure fc;
+ struct GNUNET_FS_UpdateInformationGraph *uig;
+
+ uig = read_update_information_graph (h, ns);
+ if (NULL == uig->update_nodes)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "No updateable nodes found for ID `%s'\n", next_id);
+ free_update_information_graph (uig);
+ return; /* no nodes */
+ }
+ uig->update_map =
+ GNUNET_CONTAINER_multihashmap_create (2 +
+ 3 * uig->update_node_count /
+ 4,
+ GNUNET_NO);
+ for (i = 0; i < uig->update_node_count; i++)
+ {
+ nsn = uig->update_nodes[i];
+ GNUNET_CRYPTO_hash (nsn->id, strlen (nsn->id), &hc);
+ GNUNET_CONTAINER_multihashmap_put (uig->update_map, &hc, nsn,
+ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
+ }
+ if (NULL != next_id)
+ {
+ GNUNET_CRYPTO_hash (next_id, strlen (next_id), &hc);
+ pc.ip = ip;
+ pc.ip_cls = ip_cls;
+ GNUNET_CONTAINER_multihashmap_get_multiple (uig->update_map, &hc,
+ &process_update_node, &pc);
+ free_update_information_graph (uig);
return;
- ctx.cb = cb;
- ctx.cb_cls = cb_cls;
- GNUNET_DISK_directory_scan (dn,
- &process_namespace,
- &ctx);
- GNUNET_free (dn);
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Calculating TREEs to find roots of update trees\n");
+ /* Find heads of TREEs in update graph */
+ nug = ++uig->nug_gen;
+ fc.tree_array = NULL;
+ fc.tree_array_size = 0;
+
+ for (i = 0; i < uig->update_node_count; i++)
+ {
+ nsn = uig->update_nodes[i];
+ if (nsn->nug == nug)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "TREE of node `%s' is %u\n", nsn->id,
+ nsn->nug);
+ continue; /* already placed in TREE */
+ }
+ GNUNET_CRYPTO_hash (nsn->update, strlen (nsn->update), &hc);
+ nsn->nug = nug;
+ nsn->tree_id = UINT_MAX;
+ fc.id = UINT_MAX;
+ fc.nug = nug;
+ fc.uig = uig;
+ GNUNET_CONTAINER_multihashmap_get_multiple (uig->update_map, &hc,
+ &find_trees, &fc);
+ if (UINT_MAX == fc.id)
+ {
+ /* start new TREE */
+ for (fc.id = 0; fc.id < fc.tree_array_size; fc.id++)
+ {
+ if (NULL == fc.tree_array[fc.id])
+ {
+ fc.tree_array[fc.id] = nsn;
+ nsn->tree_id = fc.id;
+ break;
+ }
+ }
+ if (fc.id == fc.tree_array_size)
+ {
+ GNUNET_array_append (fc.tree_array, fc.tree_array_size, nsn);
+ nsn->tree_id = fc.id;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Starting new TREE %u with node `%s'\n", nsn->tree_id,
+ nsn->id);
+ /* put all nodes with same identifier into this TREE */
+ GNUNET_CRYPTO_hash (nsn->id, strlen (nsn->id), &hc);
+ fc.id = nsn->tree_id;
+ fc.nug = nug;
+ fc.uig = uig;
+ GNUNET_CONTAINER_multihashmap_get_multiple (uig->update_map, &hc,
+ &find_trees, &fc);
+ }
+ else
+ {
+ /* make head of TREE "id" */
+ fc.tree_array[fc.id] = nsn;
+ nsn->tree_id = fc.id;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "TREE of node `%s' is %u\n", nsn->id,
+ fc.id);
+ }
+ for (i = 0; i < fc.tree_array_size; i++)
+ {
+ nsn = fc.tree_array[i];
+ if (NULL != nsn)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Root of TREE %u is node `%s'\n", i,
+ nsn->id);
+ ip (ip_cls, nsn->id, nsn->uri, nsn->md, nsn->update);
+ }
+ }
+ GNUNET_array_grow (fc.tree_array, fc.tree_array_size, 0);
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Done processing TREEs\n");
+ free_update_information_graph (uig);
}
-/* end of fs_namespace.c */
+/* end of fs_namespace.c */
projects / oweals / gnunet.git / blobdiff