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/*
This file is part of GNUnet.
(C) 2012 Christian Grothoff (and other contributing authors)
GNUnet 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, 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNUnet; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
/**
* @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"
/**
* Global return value.
*/
static int ret = 1;
/**
* 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
* @param tc scheduler context
*/
static void
maint_child_death (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
{
enum GNUNET_OS_ProcessStatusType type;
unsigned long code;
if ( (GNUNET_OK ==
GNUNET_OS_process_status (p, &type, &code)) &&
(type == GNUNET_OS_PROCESS_EXITED) &&
(0 == code) )
ret = 0;
else
GNUNET_break (0 == GNUNET_OS_process_kill (p, SIGTERM));
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;
GNUNET_SCHEDULER_TaskIdentifier rt;
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_NO, 0,
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_NO, GNUNET_NO, GNUNET_NO, GNUNET_NO);
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 ((void *) argv);
return (GNUNET_OK == ret) ? 0 : 1;
}
/* end of gnunet-uri.c */
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