core: Add gpgme_op_query_swdb and helper.

* src/gpgme.h.in (gpgme_query_swdb_result_t): New.
(gpgme_op_query_swdb): New.
(gpgme_op_query_swdb_result): New.
* src/libgpgme.vers, src/gpgme.def: Add the two new functions.
* src/queryswdb.c: New.
* src/Makefile.am (main_sources): Add new file.
* src/context.h (OPDATA_QUERY_SWDB): New.
* src/engine-backend.h (struct engine_ops): Add field 'query_swdb'.
Adjust all initializer.
* src/engine.c (_gpgme_engine_op_query_swdb): New.
* src/engine-gpgconf.c (parse_swdb_line): New.
(gpgconf_query_swdb): New.
(_gpgme_engine_ops_gpgconf): Register that function.

* src/util.h (GPG_ERR_TOO_OLD): Define for older libgpg-error.
(GPG_ERR_ENGINE_TOO_OLD): Ditto.

* tests/run-swdb.c: New.
* tests/Makefile.am (noinst_PROGRAMS): Add new debug tool.

Signed-off-by: Werner Koch <[email protected]>

1 files changed, 121 insertions, 0 deletions

diff --git a/src/queryswdb.c b/src/queryswdb.c
new file mode 100644
index 00000000..ce50b1e8
--- /dev/null
+++ b/src/queryswdb.c
@@ -0,0 +1,121 @@
+/* queryswdb.c - Access to the SWDB file
+ * Copyright (C) 2016 g10 Code GmbH
+ *
+ * This file is part of GPGME.
+ *
+ * GPGME 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 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * GPGME 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdlib.h>
+#include <assert.h>
+
+#include "gpgme.h"
+#include "debug.h"
+#include "context.h"
+#include "ops.h"
+
+
+typedef struct
+{
+  struct _gpgme_op_query_swdb_result result;
+
+} *op_data_t;
+
+
+
+static void
+release_op_data (void *hook)
+{
+  op_data_t opd = (op_data_t) hook;
+  gpgme_query_swdb_result_t result = &opd->result;
+
+  assert (!result->next);
+  free (result->name);
+  free (result->iversion);
+  free (result->version);
+}
+
+
+gpgme_query_swdb_result_t
+gpgme_op_query_swdb_result (gpgme_ctx_t ctx)
+{
+  void *hook;
+  op_data_t opd;
+  gpgme_error_t err;
+
+  TRACE_BEG (DEBUG_CTX, "gpgme_op_query_swdb_result", ctx);
+
+  err = _gpgme_op_data_lookup (ctx, OPDATA_QUERY_SWDB, &hook, -1, NULL);
+  opd = hook;
+
+  if (err || !opd)
+    {
+      TRACE_SUC0 ("result=(null)");
+      return NULL;
+    }
+
+  TRACE_SUC1 ("result=%p", &opd->result);
+  return &opd->result;
+}
+
+
+
+/* Query the swdb for software package NAME and check against the
+ * installed version given by IVERSION.  If IVERSION is NULL a check
+ * is only done if GPGME can figure out the version by itself
+ * (e.g. for "gpgme" or "gnupg").  RESERVED should be 0.
+ *
+ * Note that we only implemented the synchronous variant of this
+ * function but the API is prepared for an asynchronous variant.
+ */
+gpgme_error_t
+gpgme_op_query_swdb (gpgme_ctx_t ctx, const char *name, const char *iversion,
+                     unsigned int reserved)
+{
+  gpgme_error_t err;
+  void *hook;
+  op_data_t opd;
+
+  TRACE_BEG2 (DEBUG_CTX, "gpgme_op_query_swdb", ctx,
+	      "name=%s, iversion=%a", name, iversion);
+
+  if (!ctx || reserved)
+    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
+
+  if (ctx->protocol != GPGME_PROTOCOL_GPGCONF)
+    return TRACE_ERR (gpg_error (GPG_ERR_UNSUPPORTED_PROTOCOL));
+
+  if (!name)
+    name = "gpgme";
+
+  if (!iversion && !strcmp (name, "gpgme"))
+    iversion = VERSION;
+
+  err = _gpgme_op_reset (ctx, 1);
+  if (err)
+    return err;
+
+  err = _gpgme_op_data_lookup (ctx, OPDATA_QUERY_SWDB, &hook,
+                               sizeof (*opd), release_op_data);
+  opd = hook;
+  if (err)
+    return TRACE_ERR (err);
+
+  err = _gpgme_engine_op_query_swdb (ctx->engine, name, iversion,
+                                     &opd->result);
+  return TRACE_ERR (err);
+}