1 files changed, 192 insertions, 0 deletions

diff --git a/src/cli/util/gnunet-uri.c b/src/cli/util/gnunet-uri.c
new file mode 100644
index 000000000..128167cc5
--- /dev/null
+++ b/src/cli/util/gnunet-uri.c
@@ -0,0 +1,192 @@
+/*
+     This file is part of GNUnet.
+     Copyright (C) 2012 GNUnet e.V.
+
+     GNUnet is free software: you can redistribute it and/or modify it
+     under the terms of the GNU Affero General Public License as published
+     by the Free Software Foundation, either version 3 of the License,
+     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
+     Affero General Public License for more details.
+
+     You should have received a copy of the GNU Affero General Public License
+     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+     SPDX-License-Identifier: AGPL3.0-or-later
+ */
+
+/**
+ * @file util/gnunet-uri.c
+ * @brief tool to dispatch URIs to the appropriate GNUnet helper process
+ * @author Christian Grothoff
+ */
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+
+/**
+ * Handler exit code
+ */
+static long unsigned int exit_code = 0;
+
+/**
+ * Helper process we started.
+ */
+static struct GNUNET_OS_Process *p;
+
+/**
+ * Pipe used to communicate shutdown via signal.
+ */
+static struct GNUNET_DISK_PipeHandle *sigpipe;
+
+
+/**
+ * Task triggered whenever we receive a SIGCHLD (child
+ * process died) or when user presses CTRL-C.
+ *
+ * @param cls closure, NULL
+ */
+static void
+maint_child_death (void *cls)
+{
+  enum GNUNET_OS_ProcessStatusType type;
+
+  (void) cls;
+  if ((GNUNET_OK != GNUNET_OS_process_status (p, &type, &exit_code)) ||
+      (type != GNUNET_OS_PROCESS_EXITED))
+    GNUNET_break (0 == GNUNET_OS_process_kill (p, GNUNET_TERM_SIG));
+  GNUNET_OS_process_destroy (p);
+}
+
+
+/**
+ * Main function that will be run by the scheduler.
+ *
+ * @param cls closure
+ * @param args remaining command-line arguments
+ * @param cfgfile name of the configuration file used (for saving, can be NULL!)
+ * @param cfg configuration
+ */
+static void
+run (void *cls,
+     char *const *args,
+     const char *cfgfile,
+     const struct GNUNET_CONFIGURATION_Handle *cfg)
+{
+  const char *uri;
+  const char *slash;
+  char *subsystem;
+  char *program;
+  struct GNUNET_SCHEDULER_Task *rt;
+
+  (void) cls;
+  (void) cfgfile;
+  if (NULL == (uri = args[0]))
+  {
+    fprintf (stderr, _ ("No URI specified on command line\n"));
+    return;
+  }
+  if (0 != strncasecmp ("gnunet://", uri, strlen ("gnunet://")))
+  {
+    fprintf (stderr,
+             _ ("Invalid URI: does not start with `%s'\n"),
+             "gnunet://");
+    return;
+  }
+  uri += strlen ("gnunet://");
+  if (NULL == (slash = strchr (uri, '/')))
+  {
+    fprintf (stderr, _ ("Invalid URI: fails to specify subsystem\n"));
+    return;
+  }
+  subsystem = GNUNET_strndup (uri, slash - uri);
+  if (GNUNET_OK !=
+      GNUNET_CONFIGURATION_get_value_string (cfg, "uri", subsystem, &program))
+  {
+    fprintf (stderr, _ ("No handler known for subsystem `%s'\n"), subsystem);
+    GNUNET_free (subsystem);
+    return;
+  }
+  GNUNET_free (subsystem);
+  rt = GNUNET_SCHEDULER_add_read_file (
+    GNUNET_TIME_UNIT_FOREVER_REL,
+    GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ),
+    &maint_child_death,
+    NULL);
+  p = GNUNET_OS_start_process (GNUNET_OS_INHERIT_STD_NONE,
+                               NULL,
+                               NULL,
+                               NULL,
+                               program,
+                               program,
+                               args[0],
+                               NULL);
+  GNUNET_free (program);
+  if (NULL == p)
+    GNUNET_SCHEDULER_cancel (rt);
+}
+
+
+/**
+ * Signal handler called for SIGCHLD.  Triggers the
+ * respective handler by writing to the trigger pipe.
+ */
+static void
+sighandler_child_death ()
+{
+  static char c;
+  int old_errno = errno; /* back-up errno */
+
+  GNUNET_break (
+    1 ==
+    GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle (sigpipe,
+                                                     GNUNET_DISK_PIPE_END_WRITE),
+                            &c,
+                            sizeof(c)));
+  errno = old_errno; /* restore errno */
+}
+
+
+/**
+ * The main function to handle gnunet://-URIs.
+ *
+ * @param argc number of arguments from the command line
+ * @param argv command line arguments
+ * @return 0 ok, 1 on error
+ */
+int
+main (int argc, char *const *argv)
+{
+  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
+    GNUNET_GETOPT_OPTION_END
+  };
+  struct GNUNET_SIGNAL_Context *shc_chld;
+  int ret;
+
+  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
+    return 2;
+  sigpipe = GNUNET_DISK_pipe (GNUNET_DISK_PF_NONE);
+  GNUNET_assert (sigpipe != NULL);
+  shc_chld =
+    GNUNET_SIGNAL_handler_install (GNUNET_SIGCHLD, &sighandler_child_death);
+  ret = GNUNET_PROGRAM_run (argc,
+                            argv,
+                            "gnunet-uri URI",
+                            gettext_noop (
+                              "Perform default-actions for GNUnet URIs"),
+                            options,
+                            &run,
+                            NULL);
+  GNUNET_SIGNAL_handler_uninstall (shc_chld);
+  shc_chld = NULL;
+  GNUNET_DISK_pipe_close (sigpipe);
+  sigpipe = NULL;
+  GNUNET_free_nz ((void *) argv);
+  return ((GNUNET_OK == ret) && (0 == exit_code)) ? 0 : 1;
+}
+
+
+/* end of gnunet-uri.c */