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[taler-sync] 01/02: wip
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gnunet |
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Subject: |
[taler-sync] 01/02: wip |
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Date: |
Thu, 14 Nov 2019 19:34:06 +0100 |
This is an automated email from the git hooks/post-receive script.
grothoff pushed a commit to branch master
in repository sync.
commit 0ccb604a22f4134c682a5399aedfc239de2f608b
Author: Christian Grothoff <address@hidden>
AuthorDate: Thu Nov 14 18:51:46 2019 +0100
wip
---
src/Makefile.am | 2 +-
src/include/sync_database_plugin.h | 173 +++++++++++++++++++++++++-------
src/syncdb/Makefile.am | 6 +-
src/syncdb/plugin_sync_postgres.c | 196 ++++++++++++++++++++++++++++++++-----
src/syncdb/sync_db_plugin.c | 22 ++---
src/util/Makefile.am | 28 ++++++
src/util/os_installation.c | 71 ++++++++++++++
src/util/sync-config | 17 ++++
8 files changed, 443 insertions(+), 72 deletions(-)
diff --git a/src/Makefile.am b/src/Makefile.am
index 0746ad4..cd274f1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,3 +1,3 @@
# This Makefile is in the public domain
AM_CPPFLAGS = -I$(top_srcdir)/src/include
-SUBDIRS = include syncdb sync lib
+SUBDIRS = include util syncdb sync lib
diff --git a/src/include/sync_database_plugin.h
b/src/include/sync_database_plugin.h
index 5563cf3..b847888 100644
--- a/src/include/sync_database_plugin.h
+++ b/src/include/sync_database_plugin.h
@@ -1,25 +1,25 @@
/*
- This file is part of Sync
+ This file is part of GNU Taler
Copyright (C) 2019 Taler Systems SA
- Sync is free software; you can redistribute it and/or modify it under the
+ Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free
Software
Foundation; either version 3, or (at your option) any later version.
- Sync is distributed in the hope that it will be useful, but WITHOUT ANY
+ Taler 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
- Sync; see the file COPYING.GPL. If not, see <http://www.gnu.org/licenses/>
+ Taler; see the file COPYING.GPL. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file include/sync_database_plugin.h
* @brief database access for Sync
* @author Christian Grothoff
*/
-#ifndef TALER_SYNC_DATABASE_PLUGIN_H
-#define TALER_SYNC_DATABASE_PLUGIN_H
+#ifndef SYNC_DATABASE_PLUGIN_H
+#define SYNC_DATABASE_PLUGIN_H
#include <gnunet/gnunet_util_lib.h>
#include <sync_error_codes.h>
@@ -27,6 +27,79 @@
#include <jansson.h>
#include <taler/taler_util.h>
+/**
+ * Private key identifying an account.
+ */
+struct SYNC_AccountPrivateKey
+{
+ /**
+ * We use EdDSA.
+ */
+ struct GNUNET_EdDSAPrivateKey eddsa_priv;
+};
+
+
+/**
+ * Public key identifying an account.
+ */
+struct SYNC_AccountPublicKey
+{
+ /**
+ * We use EdDSA.
+ */
+ struct GNUNET_EdDSAPrivateKey eddsa_priv;
+};
+
+
+/**
+ * Signature made with an account's public key.
+ */
+struct SYNC_AccountSignature
+{
+ /**
+ * We use EdDSA.
+ */
+ struct GNUNET_EdDSASignature eddsa_sig;
+};
+
+
+/**
+ * Possible status codes returned from the SYNC database.
+ */
+enum SYNC_DB_QueryStatus
+{
+ /**
+ * Update failed because the old backup hash does not match what we
previously had in the DB.
+ */
+ SYNC_DB_OLD_BACKUP_MISSMATCH = -4,
+
+ /**
+ * Account is unpaid.
+ */
+ SYNC_DB_QS_PAYMENT_REQUIRED = -3,
+
+ /**
+ * Hard database issue, retries futile.
+ */
+ SYNC_DB_HARD_ERROR = -2,
+
+ /**
+ * Soft database error, retrying may help.
+ */
+ SYNC_DB_SOFT_ERROR = -1,
+
+ /**
+ * Database succeeded, but no results.
+ */
+ SYNC_DB_NO_RESULTS = 0,
+
+ /**
+ * Database succeeded, one change or result.
+ */
+ SYNC_DB_ONE_RESULT = 1
+};
+
+
/**
* Handle to interact with the database.
*
@@ -67,51 +140,85 @@ struct SYNC_DatabasePlugin
* truth and financial records older than @a fin_expire.
*
* @param cls closure
- * @param fin_expire financial records older than the given
- * time stamp should be garbage collected (usual
- * values might be something like 6-10 years in the past)
+ * @param expire backups older than the given time stamp should be garbage
collected
* @return transaction status
*/
enum SYNC_DB_QueryStatus
(*gc)(void *cls,
- struct GNUNET_TIME_Absolute fin_expire);
+ struct GNUNET_TIME_Absolute expire);
/**
- * Do a pre-flight check that we are not in an uncommitted transaction.
- * If we are, try to commit the previous transaction and output a warning.
- * Does not return anything, as we will continue regardless of the outcome.
- *
- * @param cls the `struct PostgresClosure` with the plugin-specific state
- */
- void
- (*preflight) (void *cls);
-
- /**
- * Check that the database connection is still up.
- *
- * @param pg connection to check
- */
- void
- (*check_connection) (void *cls);
+ * Store backup. Only applicable for the FIRST backup under
+ * an @a account_pub. Use @e update_backup_TR to update an
+ * existing backup.
+ *
+ * @param cls closure
+ * @param account_pub account to store @a backup under
+ * @param account_sig signature affirming storage request
+ * @param backup_hash hash of @a backup
+ * @param backup_size number of bytes in @a backup
+ * @param backup raw data to backup
+ * @return transaction status
+ */
+ enum SYNC_DB_QueryStatus
+ (*store_backup_TR)(void *cls,
+ const struct SYNC_AccountPublicKey *account_pub,
+ const struct SYNC_AccountSignature *account_sig,
+ const struct GNUNET_HashCode *backup_hash,
+ size_t backup_size,
+ const void *backup);
/**
- * Store backup.
+ * Update backup.
*
* @param cls closure
+ * @param account_pub account to store @a backup under
+ * @param account_sig signature affirming storage request
+ * @param old_backup_hash hash of the previous backup (must match)
+ * @param backup_hash hash of @a backup
+ * @param backup_size number of bytes in @a backup
+ * @param backup raw data to backup
* @return transaction status
*/
- enum GNUNET_DB_QueryStatus
- (*store_backup)(void *cls,
- ...);
+ enum SYNC_DB_QueryStatus
+ (*update_backup_TR)(void *cls,
+ const struct SYNC_AccountPublicKey *account_pub,
+ const struct GNUNET_HashCode *old_backup_hash,
+ const struct SYNC_AccountSignature *account_sig,
+ const struct GNUNET_HashCode *backup_hash,
+ size_t backup_size,
+ const void *backup);
/**
* Obtain backup.
*
* @param cls closure
+ * @param account_pub account to store @a backup under
+ * @param account_sig[OUT] set to signature affirming storage request
+ * @param backup_hash[OUT] set to hash of @a backup
+ * @param backup_size[OUT] set to number of bytes in @a backup
+ * @param backup[OUT] set to raw data to backup, caller MUST FREE
*/
- enum GNUNET_DB_QueryStatus
- (*lookup_backup)(void *cls,
- ...);
+ enum SYNC_DB_QueryStatus
+ (*lookup_backup_TR)(void *cls,
+ const struct SYNC_AccountPublicKey *account_pub,
+ struct SYNC_AccountSignature *account_sig,
+ struct GNUNET_HashCode *backup_hash,
+ size_t *backup_size,
+ void **backup);
+
+ /**
+ * Increment account lifetime.
+ *
+ * @param cls closure
+ * @param account_pub which account received a payment
+ * @param lifetime for how long is the account now paid (increment)
+ * @return transaction status
+ */
+ enum SYNC_DB_QueryStatus
+ (*increment_lifetime_TR)(void *cls,
+ const struct SYNC_AccountPublicKey *account_pub,
+ struct GNUNET_TIME_Relative lifetime);
};
#endif
diff --git a/src/syncdb/Makefile.am b/src/syncdb/Makefile.am
index 56db964..9b3d4b0 100644
--- a/src/syncdb/Makefile.am
+++ b/src/syncdb/Makefile.am
@@ -1,7 +1,7 @@
# This Makefile.am is in the public domain
AM_CPPFLAGS = -I$(top_srcdir)/src/include
-plugindir = $(libdir)/taler
+plugindir = $(libdir)/sync
if HAVE_POSTGRESQL
if HAVE_GNUNETPQ
@@ -27,11 +27,11 @@ libsyncdb_la_LIBADD = \
-lgnunetutil
libsyncdb_la_LDFLAGS = \
$(POSTGRESQL_LDFLAGS) \
- -version-info 2:0:0 \
+ -version-info 0:0:0 \
-no-undefined
libsync_plugin_db_postgres_la_SOURCES = \
- plugin_sync_postgres.c
+ plugin_syncdb_postgres.c
libsync_plugin_db_postgres_la_LIBADD = \
$(LTLIBINTL)
libsync_plugin_db_postgres_la_LDFLAGS = \
diff --git a/src/syncdb/plugin_sync_postgres.c
b/src/syncdb/plugin_sync_postgres.c
index 4e63198..59df4d5 100644
--- a/src/syncdb/plugin_sync_postgres.c
+++ b/src/syncdb/plugin_sync_postgres.c
@@ -15,10 +15,8 @@
*/
/**
* @file sync/plugin_syncdb_postgres.c
- * @brief database helper functions for postgres used by the sync
- * @author Sree Harsha Totakura <address@hidden>
+ * @brief database helper functions for postgres used by sync
* @author Christian Grothoff
- * @author Marcello Stanisci
*/
#include "platform.h"
#include <gnunet/gnunet_util_lib.h>
@@ -27,12 +25,6 @@
#include "sync_database_plugin.h"
#include "sync_database_lib.h"
-/**
- * How often do we re-try if we run into a DB serialization error?
- */
-#define MAX_RETRIES 3
-
-
/**
* Type of the "cls" argument given to each of the functions in
* our API.
@@ -69,6 +61,7 @@ postgres_drop_tables (void *cls)
{
struct PostgresClosure *pg = cls;
struct GNUNET_PQ_ExecuteStatement es[] = {
+ GNUNET_PQ_make_try_execute ("DROP TABLE IF EXISTS accounts CASCADE;"),
GNUNET_PQ_make_try_execute ("DROP TABLE IF EXISTS backups;"),
GNUNET_PQ_EXECUTE_STATEMENT_END
};
@@ -125,6 +118,7 @@ postgres_preflight (void *cls)
pg->transaction_name = NULL;
}
+
/**
* Start a transaction.
*
@@ -157,12 +151,13 @@ begin_transaction (void *cls,
return GNUNET_OK;
}
+
/**
-* Roll back the current transaction of a database connection.
-*
-* @param cls the `struct PostgresClosure` with the plugin-specific state
-* @return #GNUNET_OK on success
-*/
+ * Roll back the current transaction of a database connection.
+ *
+ * @param cls the `struct PostgresClosure` with the plugin-specific state
+ * @return #GNUNET_OK on success
+ */
static void
rollback (void *cls)
{
@@ -182,14 +177,14 @@ rollback (void *cls)
pg->transaction_name = NULL;
}
+
/**
* Commit the current transaction of a database connection.
*
* @param cls the `struct PostgresClosure` with the plugin-specific state
* @return transaction status code
*/
-
-static enum SYNC_DB_QueryStatus
+static enum GNUNET_DB_QueryStatus
commit_transaction (void *cls)
{
struct PostgresClosure *pg = cls;
@@ -206,6 +201,108 @@ commit_transaction (void *cls)
}
+/**
+ * Function called to perform "garbage collection" on the
+ * database, expiring records we no longer require. Deletes
+ * all user records that are not paid up (and by cascade deletes
+ * the associated recovery documents). Also deletes expired
+ * truth and financial records older than @a fin_expire.
+ *
+ * @param cls closure
+ * @param expire backups older than the given time stamp should be garbage
collected
+ * @return transaction status
+ */
+static enum SYNC_DB_QueryStatus
+postgres_gc (void *cls,
+ struct GNUNET_TIME_Absolute expire)
+{
+}
+
+
+/**
+ * Store backup. Only applicable for the FIRST backup under
+ * an @a account_pub. Use @e update_backup_TR to update an
+ * existing backup.
+ *
+ * @param cls closure
+ * @param account_pub account to store @a backup under
+ * @param account_sig signature affirming storage request
+ * @param backup_hash hash of @a backup
+ * @param backup_size number of bytes in @a backup
+ * @param backup raw data to backup
+ * @return transaction status
+ */
+static enum SYNC_DB_QueryStatus
+postgres_store_backup (void *cls,
+ const struct SYNC_AccountPublicKey *account_pub,
+ const struct SYNC_AccountSignature *account_sig,
+ const struct GNUNET_HashCode *backup_hash,
+ size_t backup_size,
+ const void *backup)
+{
+}
+
+
+/**
+ * Update backup.
+ *
+ * @param cls closure
+ * @param account_pub account to store @a backup under
+ * @param account_sig signature affirming storage request
+ * @param old_backup_hash hash of the previous backup (must match)
+ * @param backup_hash hash of @a backup
+ * @param backup_size number of bytes in @a backup
+ * @param backup raw data to backup
+ * @return transaction status
+ */
+static enum SYNC_DB_QueryStatus
+postgres_update_backup (void *cls,
+ const struct SYNC_AccountPublicKey *account_pub,
+ const struct GNUNET_HashCode *old_backup_hash,
+ const struct SYNC_AccountSignature *account_sig,
+ const struct GNUNET_HashCode *backup_hash,
+ size_t backup_size,
+ const void *backup)
+{
+}
+
+
+/**
+ * Obtain backup.
+ *
+ * @param cls closure
+ * @param account_pub account to store @a backup under
+ * @param account_sig[OUT] set to signature affirming storage request
+ * @param backup_hash[OUT] set to hash of @a backup
+ * @param backup_size[OUT] set to number of bytes in @a backup
+ * @param backup[OUT] set to raw data to backup, caller MUST FREE
+ */
+static enum SYNC_DB_QueryStatus
+postgres_lookup_backup (void *cls,
+ const struct SYNC_AccountPublicKey *account_pub,
+ struct SYNC_AccountSignature *account_sig,
+ struct GNUNET_HashCode *backup_hash,
+ size_t *backup_size,
+ void **backup)
+{
+}
+
+
+/**
+ * Increment account lifetime.
+ *
+ * @param cls closure
+ * @param account_pub which account received a payment
+ * @param lifetime for how long is the account now paid (increment)
+ * @return transaction status
+ */
+static enum SYNC_DB_QueryStatus
+postgres_increment_lifetime (void *cls,
+ const struct SYNC_AccountPublicKey *account_pub,
+ struct GNUNET_TIME_Relative lifetime)
+{
+}
+
/**
* Initialize Postgres database subsystem.
@@ -223,19 +320,68 @@ libsync_plugin_db_postgres_init (void *cls)
/* Orders created by the frontend, not signed or given a nonce yet.
The contract terms will change (nonce will be added) when moved to the
contract terms table */
+ GNUNET_PQ_make_execute ("CREATE TABLE IF NOT EXISTS accounts"
+ "("
+ "account_pub BYTEA PRIMARY KEY CHECK
(length(account_pub)=32),"
+ "expiration_date INT8 NOT NULL"
+ ");"),
GNUNET_PQ_make_execute ("CREATE TABLE IF NOT EXISTS backups"
- "("
- "data BYTEA NOT NULL,"
+ "("
+ "account_pub BYTEA PRIMARY KEY REFERENCES accounts
(account_pub),"
+ "account_sig BYTEA NOT NULL CHECK
(length(account_sig)=64),"
+ "backup_hash BYTEA NOT NULL CHECK
(length(backup_hash)=64),"
+ "data BYTEA NOT NULL"
");"),
+ /* index for gc */
+ GNUNET_PQ_make_try_execute (
+ "CREATE INDEX accounts_expire ON "
+ "accounts (expiration_date);"),
GNUNET_PQ_EXECUTE_STATEMENT_END
};
struct GNUNET_PQ_PreparedStatement ps[] = {
+ GNUNET_PQ_make_prepare ("account_insert",
+ "INSERT INTO accounts "
+ "("
+ "account_pub,"
+ "expiration_date"
+ ") VALUES "
+ "($1,$2);",
+ 2),
+ GNUNET_PQ_make_prepare ("account_update",
+ "UPDATE accounts "
+ "SET"
+ " expiration_date=expiration_data+$1 "
+ "WHERE"
+ " account_pub=$2;",
+ 2),
+ GNUNET_PQ_make_prepare ("gc",
+ "DELETE FROM accounts "
+ "WHERE"
+ " expiration_data<$1;",
+ 1),
GNUNET_PQ_make_prepare ("backup_insert",
"INSERT INTO backups "
- "(data"
+ "("
+ "account_pub,"
+ "account_sig,"
+ "backup_hash,"
+ "data"
") VALUES "
- "($1);",
- 1),
+ "($1,$2,$3,$4);",
+ 4),
+ GNUNET_PQ_make_prepare ("backup_update",
+ "UPDATE backups "
+ " SET"
+ " backup_hash=$1,"
+ " account_sig=$2,"
+ " data=$3"
+ " WHERE"
+ " account_pub=$4"
+ " AND"
+ " backup_hash=$5"
+ ") VALUES "
+ "($1,$2,$3,$4,$5);",
+ 5),
GNUNET_PQ_make_prepare ("do_commit",
"COMMIT",
0),
@@ -256,9 +402,10 @@ libsync_plugin_db_postgres_init (void *cls)
plugin = GNUNET_new (struct SYNC_DatabasePlugin);
plugin->cls = pg;
plugin->drop_tables = &postgres_drop_tables;
- plugin->preflight = &postgres_preflight;
- plugin->rollback = &rollback;
- plugin->commit = &commit_transaction;
+ plugin->gc = &postgres_gc;
+ plugin->store_backup_TR = &postgres_store_backup;
+ plugin->update_backup_TR = &postgres_update_backup;
+ plugin->increment_lifetime_TR = &postgres_increment_lifetime;
return plugin;
}
@@ -281,4 +428,5 @@ libsync_plugin_db_postgres_done (void *cls)
return NULL;
}
+
/* end of plugin_syncdb_postgres.c */
diff --git a/src/syncdb/sync_db_plugin.c b/src/syncdb/sync_db_plugin.c
index 6b2c6e0..6c4f8d5 100644
--- a/src/syncdb/sync_db_plugin.c
+++ b/src/syncdb/sync_db_plugin.c
@@ -1,6 +1,6 @@
/*
This file is part of TALER
- Copyright (C) 2015, 2016 GNUnet e.V. and INRIA
+ Copyright (C) 2019 Taler Systems SA
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free
Software
@@ -14,13 +14,13 @@
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
- * @file merchantdb/merchantdb_plugin.c
+ * @file syncdb/sync_db_plugin.c
* @brief Logic to load database plugin
* @author Christian Grothoff
* @author Sree Harsha Totakura <address@hidden>
*/
#include "platform.h"
-#include "anastasis_database_plugin.h"
+#include "sync_database_plugin.h"
#include <ltdl.h>
@@ -30,27 +30,27 @@
* @param cfg configuration to use
* @return #GNUNET_OK on success
*/
-struct ANASTASIS_DatabasePlugin *
-ANASTASIS_DB_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg)
+struct SYNC_DatabasePlugin *
+SYNC_DB_plugin_load (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
char *plugin_name;
char *lib_name;
struct GNUNET_CONFIGURATION_Handle *cfg_dup;
- struct ANASTASIS_DatabasePlugin *plugin;
+ struct SYNC_DatabasePlugin *plugin;
if (GNUNET_SYSERR ==
GNUNET_CONFIGURATION_get_value_string (cfg,
- "anastasis",
+ "sync",
"db",
&plugin_name))
{
GNUNET_log_config_missing (GNUNET_ERROR_TYPE_ERROR,
- "anastasis",
+ "sync",
"db");
return NULL;
}
(void) GNUNET_asprintf (&lib_name,
- "libanastasis_plugin_db_%s",
+ "libsync_plugin_db_%s",
plugin_name);
GNUNET_free (plugin_name);
cfg_dup = GNUNET_CONFIGURATION_dup (cfg);
@@ -70,7 +70,7 @@ ANASTASIS_DB_plugin_load (const struct
GNUNET_CONFIGURATION_Handle *cfg)
* @param plugin the plugin to unload
*/
void
-ANASTASIS_DB_plugin_unload (struct ANASTASIS_DatabasePlugin *plugin)
+SYNC_DB_plugin_unload (struct SYNC_DatabasePlugin *plugin)
{
char *lib_name;
@@ -146,4 +146,4 @@ plugin_fini ()
}
-/* end of anastasis_db_plugin.c */
+/* end of sync_db_plugin.c */
diff --git a/src/util/Makefile.am b/src/util/Makefile.am
new file mode 100644
index 0000000..bc1291c
--- /dev/null
+++ b/src/util/Makefile.am
@@ -0,0 +1,28 @@
+# This Makefile.am is in the public domain
+AM_CPPFLAGS = -I$(top_srcdir)/src/include $(LIBGCRYPT_CFLAGS)
+
+if USE_COVERAGE
+ AM_CFLAGS = --coverage -O0
+ XLIB = -lgcov
+endif
+
+
+pkgcfgdir = $(prefix)/share/sync/config.d/
+
+pkgcfg_DATA = \
+ paths.conf
+
+bin_SCRIPTS = \
+ sync-config
+
+lib_LTLIBRARIES = \
+ libsyncutil.la
+
+libsyncutil_la_SOURCES = \
+ os_installation.c
+libsyncutil_la_LIBADD = \
+ -lgnunetutil \
+ $(XLIB)
+libsyncutil_la_LDFLAGS = \
+ -version-info 0:0:0 \
+ -export-dynamic -no-undefined
diff --git a/src/util/os_installation.c b/src/util/os_installation.c
new file mode 100644
index 0000000..85092d1
--- /dev/null
+++ b/src/util/os_installation.c
@@ -0,0 +1,71 @@
+/*
+ This file is part of GNU Taler.
+ Copyright (C) 2019 Taler Systems SA
+
+ Sync 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.
+
+ Sync 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 Sync; see the file COPYING. If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+*/
+
+/**
+ * @file os_installation.c
+ * @brief initialize libgnunet OS subsystem for Sync.
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include <gnunet/gnunet_util_lib.h>
+
+
+/**
+ * Default project data used for installation path detection
+ * for GNU Sync.
+ */
+static const struct GNUNET_OS_ProjectData sync_pd = {
+ .libname = "libsyncutil",
+ .project_dirname = "sync",
+ .binary_name = "sync-httpd",
+ .env_varname = "SYNC_PREFIX",
+ .base_config_varname = "SYNC_BASE_CONFIG",
+ .bug_email = "address@hidden",
+ .homepage = "http://www.gnu.org/s/taler/";,
+ .config_file = "sync.conf",
+ .user_config_file = "~/.config/sync.conf",
+ .version = PACKAGE_VERSION,
+ .is_gnu = 1,
+ .gettext_domain = "sync",
+ .gettext_path = NULL,
+};
+
+
+/**
+ * Return default project data used by Sync.
+ */
+const struct GNUNET_OS_ProjectData *
+SYNC_project_data_default (void)
+{
+ return &sync_pd;
+}
+
+
+/**
+ * Initialize libsyncutil.
+ */
+void __attribute__ ((constructor))
+SYNC_OS_init ()
+{
+ GNUNET_OS_init (&sync_pd);
+}
+
+
+/* end of os_installation.c */
diff --git a/src/util/sync-config b/src/util/sync-config
new file mode 100644
index 0000000..6184167
--- /dev/null
+++ b/src/util/sync-config
@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+set -eu
+
+if ! type gnunet-config >/dev/null; then
+ echo "$0 needs gnunet-config to be installed"
+ exit 1
+fi
+
+# FIXME: not very portable ...
+# FIXME: should use "libdir" instead of prefix/lib, but somehow
+# the recursive expansion does not work ;-(.
+GC=`which gnunet-config`
+ASAN=""
+A=`ldd $GC | grep libasan` && ASAN=`echo $A | awk '{print $3 ":"}'`
+export LD_PRELOAD=${ASAN}${LD_PRELOAD:-}:/home/grothoff/lib/libsyncutil.so
+exec gnunet-config "$@"
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