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Diffstat (limited to 'src/util/gnunet-uri.c')
| -rw-r--r-- | src/util/gnunet-uri.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/src/util/gnunet-uri.c b/src/util/gnunet-uri.c new file mode 100644 index 0000000..5ca1f4e --- /dev/null +++ b/src/util/gnunet-uri.c @@ -0,0 +1,184 @@ +/* + 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 */ |