2 This file is part of GNUnet.
3 (C) 2012 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file util/gnunet-uri.c
23 * @brief tool to dispatch URIs to the appropriate GNUnet helper process
24 * @author Christian Grothoff
27 #include "gnunet_util_lib.h"
31 * Global return value.
36 * Helper process we started.
38 static struct GNUNET_OS_Process *p;
41 * Pipe used to communicate shutdown via signal.
43 static struct GNUNET_DISK_PipeHandle *sigpipe;
47 * Task triggered whenever we receive a SIGCHLD (child
48 * process died) or when user presses CTRL-C.
50 * @param cls closure, NULL
51 * @param tc scheduler context
54 maint_child_death (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
56 enum GNUNET_OS_ProcessStatusType type;
60 GNUNET_OS_process_status (p, &type, &code)) &&
61 (type == GNUNET_OS_PROCESS_EXITED) &&
65 GNUNET_break (0 == GNUNET_OS_process_kill (p, SIGTERM));
66 GNUNET_OS_process_destroy (p);
71 * Main function that will be run by the scheduler.
74 * @param args remaining command-line arguments
75 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
76 * @param cfg configuration
79 run (void *cls, char *const *args, const char *cfgfile,
80 const struct GNUNET_CONFIGURATION_Handle *cfg)
86 GNUNET_SCHEDULER_TaskIdentifier rt;
88 if (NULL == (uri = args[0]))
90 fprintf (stderr, _("No URI specified on command line\n"));
93 if (0 != strncasecmp ("gnunet://", uri, strlen ("gnunet://")))
95 fprintf (stderr, _("Invalid URI: does not start with `%s'\n"),
99 uri += strlen ("gnunet://");
100 if (NULL == (slash = strchr (uri, '/')))
102 fprintf (stderr, _("Invalid URI: fails to specify subsystem\n"));
105 subsystem = GNUNET_strndup (uri, slash - uri);
107 GNUNET_CONFIGURATION_get_value_string (cfg,
112 fprintf (stderr, _("No handler known for subsystem `%s'\n"), subsystem);
113 GNUNET_free (subsystem);
116 GNUNET_free (subsystem);
117 rt = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
118 GNUNET_DISK_pipe_handle (sigpipe,
119 GNUNET_DISK_PIPE_END_READ),
120 &maint_child_death, NULL);
121 p = GNUNET_OS_start_process (GNUNET_NO, 0,
127 GNUNET_free (program);
129 GNUNET_SCHEDULER_cancel (rt);
134 * Signal handler called for SIGCHLD. Triggers the
135 * respective handler by writing to the trigger pipe.
138 sighandler_child_death ()
141 int old_errno = errno; /* back-up errno */
144 GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle
145 (sigpipe, GNUNET_DISK_PIPE_END_WRITE),
147 errno = old_errno; /* restore errno */
152 * The main function to handle gnunet://-URIs.
154 * @param argc number of arguments from the command line
155 * @param argv command line arguments
156 * @return 0 ok, 1 on error
159 main (int argc, char *const *argv)
161 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
162 GNUNET_GETOPT_OPTION_END
164 struct GNUNET_SIGNAL_Context *shc_chld;
167 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
169 sigpipe = GNUNET_DISK_pipe (GNUNET_NO, GNUNET_NO, GNUNET_NO, GNUNET_NO);
170 GNUNET_assert (sigpipe != NULL);
172 GNUNET_SIGNAL_handler_install (GNUNET_SIGCHLD, &sighandler_child_death);
173 ret = GNUNET_PROGRAM_run (argc, argv, "gnunet-uri URI",
174 gettext_noop ("Perform default-actions for GNUnet URIs"),
175 options, &run, NULL);
176 GNUNET_SIGNAL_handler_uninstall (shc_chld);
178 GNUNET_DISK_pipe_close (sigpipe);
180 GNUNET_free ((void *) argv);
181 return (GNUNET_OK == ret) ? 0 : 1;
184 /* end of gnunet-uri.c */