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.
17 * @file util/gnunet-uri.c
18 * @brief tool to dispatch URIs to the appropriate GNUnet helper process
19 * @author Christian Grothoff
22 #include "gnunet_util_lib.h"
27 static long unsigned int exit_code = 1;
30 * Helper process we started.
32 static struct GNUNET_OS_Process *p;
35 * Pipe used to communicate shutdown via signal.
37 static struct GNUNET_DISK_PipeHandle *sigpipe;
41 * Task triggered whenever we receive a SIGCHLD (child
42 * process died) or when user presses CTRL-C.
44 * @param cls closure, NULL
47 maint_child_death (void *cls)
49 enum GNUNET_OS_ProcessStatusType type;
52 GNUNET_OS_process_status (p, &type, &exit_code)) ||
53 (type != GNUNET_OS_PROCESS_EXITED) )
54 GNUNET_break (0 == GNUNET_OS_process_kill (p, GNUNET_TERM_SIG));
55 GNUNET_OS_process_destroy (p);
60 * Main function that will be run by the scheduler.
63 * @param args remaining command-line arguments
64 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
65 * @param cfg configuration
68 run (void *cls, char *const *args, const char *cfgfile,
69 const struct GNUNET_CONFIGURATION_Handle *cfg)
75 struct GNUNET_SCHEDULER_Task * rt;
77 if (NULL == (uri = args[0]))
80 _("No URI specified on command line\n"));
83 if (0 != strncasecmp ("gnunet://", uri, strlen ("gnunet://")))
86 _("Invalid URI: does not start with `%s'\n"),
90 uri += strlen ("gnunet://");
91 if (NULL == (slash = strchr (uri, '/')))
93 fprintf (stderr, _("Invalid URI: fails to specify subsystem\n"));
96 subsystem = GNUNET_strndup (uri, slash - uri);
98 GNUNET_CONFIGURATION_get_value_string (cfg,
103 fprintf (stderr, _("No handler known for subsystem `%s'\n"), subsystem);
104 GNUNET_free (subsystem);
107 GNUNET_free (subsystem);
108 rt = GNUNET_SCHEDULER_add_read_file (GNUNET_TIME_UNIT_FOREVER_REL,
109 GNUNET_DISK_pipe_handle (sigpipe,
110 GNUNET_DISK_PIPE_END_READ),
111 &maint_child_death, NULL);
112 p = GNUNET_OS_start_process (GNUNET_NO, 0,
118 GNUNET_free (program);
120 GNUNET_SCHEDULER_cancel (rt);
125 * Signal handler called for SIGCHLD. Triggers the
126 * respective handler by writing to the trigger pipe.
129 sighandler_child_death ()
132 int old_errno = errno; /* back-up errno */
135 GNUNET_DISK_file_write (GNUNET_DISK_pipe_handle
136 (sigpipe, GNUNET_DISK_PIPE_END_WRITE),
138 errno = old_errno; /* restore errno */
143 * The main function to handle gnunet://-URIs.
145 * @param argc number of arguments from the command line
146 * @param argv command line arguments
147 * @return 0 ok, 1 on error
150 main (int argc, char *const *argv)
152 static const struct GNUNET_GETOPT_CommandLineOption options[] = {
153 GNUNET_GETOPT_OPTION_END
155 struct GNUNET_SIGNAL_Context *shc_chld;
158 if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
160 sigpipe = GNUNET_DISK_pipe (GNUNET_NO, GNUNET_NO, GNUNET_NO, GNUNET_NO);
161 GNUNET_assert (sigpipe != NULL);
163 GNUNET_SIGNAL_handler_install (GNUNET_SIGCHLD, &sighandler_child_death);
164 ret = GNUNET_PROGRAM_run (argc, argv, "gnunet-uri URI",
165 gettext_noop ("Perform default-actions for GNUnet URIs"),
166 options, &run, NULL);
167 GNUNET_SIGNAL_handler_uninstall (shc_chld);
169 GNUNET_DISK_pipe_close (sigpipe);
171 GNUNET_free ((void *) argv);
172 return ((GNUNET_OK == ret) && (0 == exit_code)) ? 0 : 1;
175 /* end of gnunet-uri.c */