2 This file is part of GNUnet.
3 Copyright (C) 2012 GNUnet e.V.
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your 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 Affero General Public License for more details.
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
18 SPDX-License-Identifier: AGPL3.0-or-later
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"
32 static long unsigned int exit_code = 1;
35 * Helper process we started.
37 static struct GNUNET_OS_Process *p;
40 * Pipe used to communicate shutdown via signal.
42 static struct GNUNET_DISK_PipeHandle *sigpipe;
46 * Task triggered whenever we receive a SIGCHLD (child
47 * process died) or when user presses CTRL-C.
49 * @param cls closure, NULL
52 maint_child_death (void *cls)
54 enum GNUNET_OS_ProcessStatusType type;
57 if ((GNUNET_OK != GNUNET_OS_process_status (p, &type, &exit_code)) ||
58 (type != GNUNET_OS_PROCESS_EXITED))
59 GNUNET_break (0 == GNUNET_OS_process_kill (p, GNUNET_TERM_SIG));
60 GNUNET_OS_process_destroy (p);
65 * Main function that will be run by the scheduler.
68 * @param args remaining command-line arguments
69 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
70 * @param cfg configuration
76 const struct GNUNET_CONFIGURATION_Handle *cfg)
82 struct GNUNET_SCHEDULER_Task *rt;
86 if (NULL == (uri = args[0]))
88 fprintf (stderr, _ ("No URI specified on command line\n"));
91 if (0 != strncasecmp ("gnunet://", uri, strlen ("gnunet://")))
94 _ ("Invalid URI: does not start with `%s'\n"),
98 uri += strlen ("gnunet://");
99 if (NULL == (slash = strchr (uri, '/')))
101 fprintf (stderr, _ ("Invalid URI: fails to specify subsystem\n"));
104 subsystem = GNUNET_strndup (uri, slash - uri);
106 GNUNET_CONFIGURATION_get_value_string (cfg, "uri", subsystem, &program))
108 fprintf (stderr, _ ("No handler known for subsystem `%s'\n"), subsystem);
109 GNUNET_free (subsystem);
112 GNUNET_free (subsystem);
113 rt = GNUNET_SCHEDULER_add_read_file (
114 GNUNET_TIME_UNIT_FOREVER_REL,
115 GNUNET_DISK_pipe_handle (sigpipe, GNUNET_DISK_PIPE_END_READ),
118 p = GNUNET_OS_start_process (GNUNET_NO,
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 */
145 GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle (sigpipe,
146 GNUNET_DISK_PIPE_END_WRITE),
149 errno = old_errno; /* restore errno */
154 * The main function to handle gnunet://-URIs.
156 * @param argc number of arguments from the command line
157 * @param argv command line arguments
158 * @return 0 ok, 1 on error
161 main (int argc, char *const *argv)
163 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
164 GNUNET_GETOPT_OPTION_END};
165 struct GNUNET_SIGNAL_Context *shc_chld;
168 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
170 sigpipe = GNUNET_DISK_pipe (GNUNET_NO, GNUNET_NO, GNUNET_NO, GNUNET_NO);
171 GNUNET_assert (sigpipe != NULL);
173 GNUNET_SIGNAL_handler_install (GNUNET_SIGCHLD, &sighandler_child_death);
174 ret = GNUNET_PROGRAM_run (argc,
178 "Perform default-actions for GNUnet URIs"),
182 GNUNET_SIGNAL_handler_uninstall (shc_chld);
184 GNUNET_DISK_pipe_close (sigpipe);
186 GNUNET_free ((void *) argv);
187 return ((GNUNET_OK == ret) && (0 == exit_code)) ? 0 : 1;
190 /* end of gnunet-uri.c */