g13: First chunk of code to support dm-crypt.wk/g13work

* g13/call-syshelp.c, g13/call-syshelp.h: New.
* g13/g13-syshelp.c, g13/g13-syshelp.h: New.
* g13/sh-cmd.c: New.
* g13/sh-blockdev.c: New.
* g13/sh-exectool.c: New.
* g13/sh-dmcrypt.c: New.
* g13/Makefile.am (sbin_PROGRAMS): Add g13-syshelp.c
(g13_syshelp_SOURCES): New.
(g13_syshelp_LDADD): New.

* g13/g13.c (opts): Add option --type.
(g13_deinit_default_ctrl): New.
(main): Implement that option.  Call g13_deinit_default_ctrl.
* g13/g13.h (struct call_syshelp_s): New declaration.
(server_control_s): Add field syshelp_local.
* g13/keyblob.h (KEYBLOB_TAG_CREATED): New.
(KEYBLOB_TAG_ALGOSTR): New.
(KEYBLOB_TAG_HDRCOPY): New.
* g13/backend.c (be_parse_conttype_name): New.
(be_get_detached_name): Add CONTTYPE_DM_CRYPT.

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

1 files changed, 124 insertions, 0 deletions

diff --git a/g13/call-syshelp.c b/g13/call-syshelp.c
new file mode 100644
index 000000000..2086dd1db
--- /dev/null
+++ b/g13/call-syshelp.c
@@ -0,0 +1,124 @@
+/* call-syshelp.c - Communication with g13-syshelp
+ * Copyright (C) 2015 Werner Koch
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG 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 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG 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 this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <assert.h>
+#include <npth.h>
+
+#include "g13.h"
+#include <assuan.h>
+#include "i18n.h"
+#include "utils.h"
+
+/* Local data for this module.  A pointer to this is stored in the
+   CTRL object of each connection.  */
+struct call_syshelp_s
+{
+  assuan_context_t assctx;  /* The Assuan context for the current
+                               g13-syshep connection.  */
+};
+
+
+/* Fork off the syshelp tool if this has not already been done.  */
+static gpg_error_t
+start_syshelp (ctrl_t ctrl)
+{
+  gpg_error_t err;
+  assuan_context_t ctx;
+  assuan_fd_t no_close_list[3];
+  int i;
+
+  if (ctrl->syshelp_local->assctx)
+    return 0; /* Already set.  */
+
+  if (opt.verbose)
+    log_info ("starting a new syshelp\n");
+
+  if (es_fflush (NULL))
+    {
+      err = gpg_error_from_syserror ();
+      log_error ("error flushing pending output: %s\n", gpg_strerror (err));
+      return err;
+    }
+
+  i = 0;
+  if (log_get_fd () != -1)
+    no_close_list[i++] = assuan_fd_from_posix_fd (log_get_fd ());
+  no_close_list[i++] = assuan_fd_from_posix_fd (es_fileno (es_stderr));
+  no_close_list[i] = ASSUAN_INVALID_FD;
+
+  err = assuan_new (&ctx);
+  if (err)
+    {
+      log_error ("can't allocate assuan context: %s\n", gpg_strerror (err));
+      return err;
+    }
+
+  /* Call userv to start g13-syshelp.  This userv script needs tpo be
+     installed under the name "gnupg-g13-syshelp":
+
+       if ( glob service-user root
+          )
+           reset
+           suppress-args
+           execute /home/wk/b/gnupg/g13/g13-syshelp -v
+       else
+           error Nothing to do for this service-user
+       fi
+       quit
+  */
+  {
+    const char *argv[3];
+
+    argv[0] = "userv";
+    argv[1] = "gnupg-g13-syshelp";
+    argv[2] = NULL;
+
+    err = assuan_pipe_connect (ctx, "/usr/bin/userv", argv,
+                               no_close_list, NULL, NULL, 0);
+  }
+  if (err)
+    {
+      log_error ("can't connect to '%s' - : %s\n",
+                 "g13-syshelp", gpg_strerror (err));
+      log_info ("(is userv and its gnupg-g13-syshelp script installed?)\n");
+      assuan_release (ctx);
+      return err;
+    }
+  ctrl->syshelp_local->assctx = ctx;
+
+  if (DBG_IPC)
+    log_debug ("connection to g13-syshelp established\n");
+
+  return 0;
+}
+
+
+/* Release local resources associated with CTRL.  */
+void
+call_syshelp_release (ctrl_t ctrl)
+{
+  assuan_release (ctrl->syshelp_local->assctx);
+  ctrl->syshelp_local->assctx = NULL;
+}