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/*
This file is part of TALER
Copyright (C) 2015, 2016, 2017 Inria
TALER 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.
TALER 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
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file taler-exchange-wire.c
* @brief Create signed response for /wire requests.
* @author Christian Grothoff
*/
#include <platform.h>
#include <jansson.h>
#include <gnunet/gnunet_json_lib.h>
#include "taler_crypto_lib.h"
#include "taler_util.h"
#include "taler_wire_lib.h"
#include "taler_signatures.h"
/**
* Filename of the master private key.
*/
static char *masterkeyfile;
/**
* Account holder information in JSON format.
*/
static json_t *account_holder;
/**
* Which wire method is this for?
*/
static char *method;
/**
* Where to write the result.
*/
static char *output_filename;
/**
* Return value from main().
*/
static int global_ret;
/**
* Main function that will be run.
*
* @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)
{
struct GNUNET_CRYPTO_EddsaPrivateKey *eddsa_priv;
struct TALER_MasterPrivateKeyP key;
struct TALER_MasterSignatureP sig;
char *json_out;
struct GNUNET_HashCode salt;
struct TALER_WIRE_Plugin *plugin;
if ( (NULL == masterkeyfile) &&
(GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_filename (cfg,
"exchange",
"MASTER_PRIV_FILE",
&masterkeyfile)) )
{
fprintf (stderr,
"Master key file not given in neither configuration nor command-line\n");
global_ret = 1;
return;
}
if (GNUNET_YES != GNUNET_DISK_file_test (masterkeyfile))
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Exchange master private key `%s' does not exist yet, creating it!\n",
masterkeyfile);
eddsa_priv = GNUNET_CRYPTO_eddsa_key_create_from_file (masterkeyfile);
if (NULL == eddsa_priv)
{
fprintf (stderr,
"Failed to initialize master key from file `%s'\n",
masterkeyfile);
global_ret = 1;
return;
}
if (NULL == method)
{
json_t *test;
const char *m;
test = json_object_get(account_holder,
"type");
if ( (NULL == test) ||
(NULL == (m = json_string_value (test))))
{
fprintf (stderr,
"Required -t argument missing\n");
global_ret = 1;
return;
}
method = GNUNET_strdup (m);
}
else
{
json_object_set_new (account_holder,
"type",
json_string (method));
}
key.eddsa_priv = *eddsa_priv;
GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE,
&salt,
sizeof (salt));
plugin = TALER_WIRE_plugin_load (cfg,
method);
if (NULL == plugin)
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Wire transfer method `%s' not supported\n",
method);
GNUNET_free (method);
global_ret = 1;
return;
}
GNUNET_free (method);
if (GNUNET_OK !=
plugin->sign_wire_details (plugin->cls,
account_holder,
&key,
&salt,
&sig))
{
/* sign function should have logged applicable errors */
json_decref (account_holder);
TALER_WIRE_plugin_unload (plugin);
global_ret = 1;
return;
}
TALER_WIRE_plugin_unload (plugin);
GNUNET_free (eddsa_priv);
/* add signature and salt to JSON message */
json_object_set_new (account_holder,
"salt",
GNUNET_JSON_from_data (&salt,
sizeof (salt)));
json_object_set_new (account_holder,
"sig",
GNUNET_JSON_from_data (&sig,
sizeof (sig)));
/* dump result to stdout */
json_out = json_dumps (account_holder,
JSON_INDENT(2));
json_decref (account_holder);
GNUNET_assert (NULL != json_out);
if (NULL != output_filename)
{
if (NULL != stdout)
fclose (stdout);
stdout = fopen (output_filename,
"w+");
if (NULL == stdout)
{
fprintf (stderr,
"Failed to open `%s': %s\n",
output_filename,
STRERROR (errno));
return;
}
}
fprintf (stdout,
"%s",
json_out);
fflush (stdout);
free (json_out);
}
/**
* The main function of the taler-exchange-wire tool. This tool is
* used to sign the bank account details using the master key.
*
* @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)
{
const struct GNUNET_GETOPT_CommandLineOption options[] = {
GNUNET_GETOPT_option_mandatory
(GNUNET_JSON_getopt ('j',
"json",
"JSON",
"account information in JSON format",
&account_holder)),
GNUNET_GETOPT_option_filename ('m',
"master-key",
"FILENAME",
"master key file (private key)",
&masterkeyfile),
GNUNET_GETOPT_option_string ('t',
"type",
"METHOD",
"which wire transfer method (i.e. 'test' or 'sepa') is this for?",
&method),
GNUNET_GETOPT_option_filename ('o',
"output",
"FILENAME",
"where to write the result",
&output_filename),
GNUNET_GETOPT_OPTION_END
};
/* force linker to link against libtalerutil; if we do
not do this, the linker may "optimize" libtalerutil
away and skip #TALER_OS_init(), which we do need */
(void) TALER_project_data_default ();
GNUNET_assert (GNUNET_OK ==
GNUNET_log_setup ("taler-exchange-wire",
"WARNING",
NULL));
if (GNUNET_OK !=
GNUNET_PROGRAM_run (argc, argv,
"taler-exchange-wire",
"Setup /wire response",
options,
&run, NULL))
return 1;
return global_ret;
}
/* end of taler-exchange-wire.c */
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