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/*
This file is part of GNUnet.
Copyright (C) 2013-2019 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
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
Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
SPDX-License-Identifier: AGPL3.0-or-later
*/
#include <stdio.h>
#include <zbar.h>
#include <stdbool.h>
#include "platform.h"
#include "gnunet_util_lib.h"
#define LOG(fmt, ...) if (verbose == true) printf(fmt, ## __VA_ARGS__)
// Command line options
static char* device = "/dev/video0";
static int verbose = false;
static int silent = false;
// Handler exit code
static long unsigned int exit_code = 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
*/
static void
maint_child_death (void *cls)
{
enum GNUNET_OS_ProcessStatusType type;
if ( (GNUNET_OK !=
GNUNET_OS_process_status (p, &type, &exit_code)) ||
(type != GNUNET_OS_PROCESS_EXITED) )
GNUNET_break (0 == GNUNET_OS_process_kill (p, GNUNET_TERM_SIG));
GNUNET_OS_process_destroy (p);
}
/**
* Dispatch URIs to the appropriate GNUnet helper process
*
* @param cls closure
* @param uri uri to dispatch
* @param cfgfile name of the configuration file used (for saving, can be NULL!)
* @param cfg configuration
*/
static void
gnunet_uri (void *cls, const char *uri, const char *cfgfile,
const struct GNUNET_CONFIGURATION_Handle *cfg)
{
const char *orig_uri;
const char *slash;
char *subsystem;
char *program;
struct GNUNET_SCHEDULER_Task * rt;
orig_uri = uri;
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, NULL,
program,
program,
orig_uri,
NULL);
GNUNET_free (program);
if (NULL == p)
GNUNET_SCHEDULER_cancel (rt);
}
/**
* 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)
{
/* create a Processor */
LOG("Initializing\n");
zbar_processor_t *proc = zbar_processor_create(1);
// FIXME: Wrap all this into a function which returns an error on
// failure. And here ensure the processor is destroyed at the end.
/* configure the Processor */
zbar_processor_parse_config(proc, "enable");
/* initialize the Processor */
LOG("Opening video device %s\n", device);
// FIXME: error handling
zbar_processor_init(proc, device, 1);
/* enable the preview window */
zbar_processor_set_visible(proc, 1);
zbar_processor_set_active(proc, 1);
/* keep scanning until user provides key/mouse input */
//zbar_processor_user_wait(proc, -1);
// read at least one barcode (or until window closed)
LOG("Capturing\n");
int n;
n = zbar_process_one(proc, -1);
LOG("Got %i images\n", n);
// FIXME: Error handling (n = -1)
// hide the preview window
zbar_processor_set_active(proc, 0);
zbar_processor_set_visible(proc, 0);
// extract results
const zbar_symbol_set_t* symbols = zbar_processor_get_results(proc);
const zbar_symbol_t* symbol = zbar_symbol_set_first_symbol(symbols);
if (symbol != NULL) {
const char* data = zbar_symbol_get_data(symbol);
LOG("Found %s \"%s\"\n",
zbar_get_symbol_name(zbar_symbol_get_type(symbol)), data);
gnunet_uri(cls, data, cfgfile, cfg);
if (exit_code != 0) {
printf("Failed to add URI %s\n", data);
} else {
printf("Added URI %s\n", data);
}
}
/* clean up */
zbar_processor_destroy(proc);
};
int
main (int argc, char *const *argv)
{
static int ret;
struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_option_string ('d', "device", "DEVICE",
gettext_noop ("use video-device DEVICE (default: /dev/video0"),
&device),
GNUNET_GETOPT_option_flag ('\0', "verbose",
gettext_noop ("be verbose"),
&verbose),
GNUNET_GETOPT_option_flag ('s', "silent",
gettext_noop ("do not show preview windows"),
&silent),
GNUNET_GETOPT_OPTION_END
};
ret = GNUNET_PROGRAM_run (argc,
argv,
"gnunet-qr",
gettext_noop ("Scan a QR code using a video device and import the uri read"),
options, &run, NULL);
return ((GNUNET_OK == ret) && (0 == exit_code)) ? 0 : 1;
}
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