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/*
This file is part of TALER
(C) 2016, 2017 Inria and GNUnet e.V.
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 bank-lib/fakebank.c
* @brief library that fakes being a Taler bank for testcases
* @author Christian Grothoff <christian@grothoff.org>
*/
#include "platform.h"
#include "taler_fakebank_lib.h"
#include "taler_bank_service.h"
/**
* Maximum POST request size (for /admin/add/incoming)
*/
#define REQUEST_BUFFER_MAX (4*1024)
/**
* Details about a transcation we (as the simulated bank) received.
*/
struct Transaction
{
/**
* We store transactions in a DLL.
*/
struct Transaction *next;
/**
* We store transactions in a DLL.
*/
struct Transaction *prev;
/**
* Amount to be transferred.
*/
struct TALER_Amount amount;
/**
* Account to debit.
*/
uint64_t debit_account;
/**
* Account to credit.
*/
uint64_t credit_account;
/**
* Subject of the transfer.
*/
char *subject;
/**
* Base URL of the exchange.
*/
char *exchange_base_url;
/**
* When did the transaction happen?
*/
struct GNUNET_TIME_Absolute date;
/**
* Number of this transaction.
*/
uint64_t serial_id;
};
/**
* Handle for the fake bank.
*/
struct TALER_FAKEBANK_Handle
{
/**
* We store transactions in a DLL.
*/
struct Transaction *transactions_head;
/**
* We store transactions in a DLL.
*/
struct Transaction *transactions_tail;
/**
* HTTP server we run to pretend to be the "test" bank.
*/
struct MHD_Daemon *mhd_bank;
/**
* Task running HTTP server for the "test" bank.
*/
struct GNUNET_SCHEDULER_Task *mhd_task;
/**
* Number of transactions.
*/
uint64_t serial_counter;
};
/**
* Check that the @a want_amount was transferred from
* the @a want_debit to the @a want_credit account. If
* so, set the @a subject to the transfer identifier.
* If not, return #GNUNET_SYSERR.
*
* @param h bank instance
* @param want_amount transfer amount desired
* @param want_debit account that should have been debited
* @param want_credit account that should have been credited
* @param exchange_base_url expected base URL of the exchange
* i.e. "https://example.com/"; may include a port
* @param[out] subject set to the wire transfer identifier
* @return #GNUNET_OK on success
*/
int
TALER_FAKEBANK_check (struct TALER_FAKEBANK_Handle *h,
const struct TALER_Amount *want_amount,
uint64_t want_debit,
uint64_t want_credit,
const char *exchange_base_url,
char **subject)
{
for (struct Transaction *t = h->transactions_head; NULL != t; t = t->next)
{
if ( (want_debit == t->debit_account) &&
(want_credit == t->credit_account) &&
(0 == TALER_amount_cmp (want_amount,
&t->amount)) &&
(0 == strcasecmp (exchange_base_url,
t->exchange_base_url)) )
{
GNUNET_CONTAINER_DLL_remove (h->transactions_head,
h->transactions_tail,
t);
*subject = t->subject;
GNUNET_free (t->exchange_base_url);
GNUNET_free (t);
return GNUNET_OK;
}
}
fprintf (stderr,
"Did not find matching transaction!\nI have:\n");
for (struct Transaction *t = h->transactions_head; NULL != t; t = t->next)
{
char *s;
s = TALER_amount_to_string (&t->amount);
fprintf (stderr,
"%llu -> %llu (%s) from %s\n",
(unsigned long long) t->debit_account,
(unsigned long long) t->credit_account,
s,
t->exchange_base_url);
GNUNET_free (s);
}
return GNUNET_SYSERR;
}
/**
* Tell the fakebank to create another wire transfer.
*
* @param h fake bank handle
* @param debit_account account to debit
* @param credit_account account to credit
* @param amount amount to transfer
* @param subject wire transfer subject to use
* @param exchange_base_url exchange URL
* @return serial_id of the transfer
*/
uint64_t
TALER_FAKEBANK_make_transfer (struct TALER_FAKEBANK_Handle *h,
uint64_t debit_account,
uint64_t credit_account,
const struct TALER_Amount *amount,
const char *subject,
const char *exchange_base_url)
{
struct Transaction *t;
GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
"Making transfer from %llu to %llu over %s and subject %s\n",
(unsigned long long) debit_account,
(unsigned long long) credit_account,
TALER_amount2s (amount),
subject);
t = GNUNET_new (struct Transaction);
t->debit_account = debit_account;
t->credit_account = credit_account;
t->amount = *amount;
t->exchange_base_url = GNUNET_strdup (exchange_base_url);
t->serial_id = ++h->serial_counter;
t->date = GNUNET_TIME_absolute_get ();
t->subject = GNUNET_strdup (subject);
GNUNET_TIME_round_abs (&t->date);
GNUNET_CONTAINER_DLL_insert_tail (h->transactions_head,
h->transactions_tail,
t);
return t->serial_id;
}
/**
* Check that no wire transfers were ordered (or at least none
* that have not been taken care of via #TALER_FAKEBANK_check()).
* If any transactions are onrecord, return #GNUNET_SYSERR.
*
* @param h bank instance
* @return #GNUNET_OK on success
*/
int
TALER_FAKEBANK_check_empty (struct TALER_FAKEBANK_Handle *h)
{
struct Transaction *t;
if (NULL == h->transactions_head)
return GNUNET_OK;
fprintf (stderr,
"Expected empty transaction set, but I have:\n");
for (t = h->transactions_head; NULL != t; t = t->next)
{
char *s;
s = TALER_amount_to_string (&t->amount);
fprintf (stderr,
"%llu -> %llu (%s) from %s\n",
(unsigned long long) t->debit_account,
(unsigned long long) t->credit_account,
s,
t->exchange_base_url);
GNUNET_free (s);
}
return GNUNET_SYSERR;
}
/**
* Stop running the fake bank.
*
* @param h bank to stop
*/
void
TALER_FAKEBANK_stop (struct TALER_FAKEBANK_Handle *h)
{
struct Transaction *t;
while (NULL != (t = h->transactions_head))
{
GNUNET_CONTAINER_DLL_remove (h->transactions_head,
h->transactions_tail,
t);
GNUNET_free (t->subject);
GNUNET_free (t->exchange_base_url);
GNUNET_free (t);
}
if (NULL != h->mhd_task)
{
GNUNET_SCHEDULER_cancel (h->mhd_task);
h->mhd_task = NULL;
}
if (NULL != h->mhd_bank)
{
MHD_stop_daemon (h->mhd_bank);
h->mhd_bank = NULL;
}
GNUNET_free (h);
}
/**
* Function called whenever MHD is done with a request. If the
* request was a POST, we may have stored a `struct Buffer *` in the
* @a con_cls that might still need to be cleaned up. Call the
* respective function to free the memory.
*
* @param cls client-defined closure
* @param connection connection handle
* @param con_cls value as set by the last call to
* the #MHD_AccessHandlerCallback
* @param toe reason for request termination
* @see #MHD_OPTION_NOTIFY_COMPLETED
* @ingroup request
*/
static void
handle_mhd_completion_callback (void *cls,
struct MHD_Connection *connection,
void **con_cls,
enum MHD_RequestTerminationCode toe)
{
/* struct TALER_FAKEBANK_Handle *h = cls; */
GNUNET_JSON_post_parser_cleanup (*con_cls);
*con_cls = NULL;
}
/**
* Handle incoming HTTP request for /admin/add/incoming.
*
* @param h the fakebank handle
* @param connection the connection
* @param upload_data request data
* @param upload_data_size size of @a upload_data in bytes
* @param con_cls closure for request (a `struct Buffer *`)
* @return MHD result code
*/
static int
handle_admin_add_incoming (struct TALER_FAKEBANK_Handle *h,
struct MHD_Connection *connection,
const char *upload_data,
size_t *upload_data_size,
void **con_cls)
{
enum GNUNET_JSON_PostResult pr;
json_t *json;
struct MHD_Response *resp;
int ret;
uint64_t serial_id;
pr = GNUNET_JSON_post_parser (REQUEST_BUFFER_MAX,
con_cls,
upload_data,
upload_data_size,
&json);
switch (pr)
{
case GNUNET_JSON_PR_OUT_OF_MEMORY:
GNUNET_break (0);
return MHD_NO;
case GNUNET_JSON_PR_CONTINUE:
return MHD_YES;
case GNUNET_JSON_PR_REQUEST_TOO_LARGE:
GNUNET_break (0);
return MHD_NO;
case GNUNET_JSON_PR_JSON_INVALID:
GNUNET_break (0);
return MHD_NO;
case GNUNET_JSON_PR_SUCCESS:
break;
}
{
const char *wtid;
uint64_t debit_account;
uint64_t credit_account;
const char *base_url;
struct TALER_Amount amount;
struct GNUNET_JSON_Specification spec[] = {
GNUNET_JSON_spec_string ("wtid", &wtid),
GNUNET_JSON_spec_uint64 ("debit_account", &debit_account),
GNUNET_JSON_spec_uint64 ("credit_account", &credit_account),
TALER_JSON_spec_amount ("amount", &amount),
GNUNET_JSON_spec_string ("exchange_url", &base_url),
GNUNET_JSON_spec_end ()
};
if (GNUNET_OK !=
GNUNET_JSON_parse (json,
spec,
NULL, NULL))
{
GNUNET_break (0);
json_decref (json);
return MHD_NO;
}
serial_id = TALER_FAKEBANK_make_transfer (h,
debit_account,
credit_account,
&amount,
wtid,
base_url);
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Receiving incoming wire transfer: %llu->%llu from %s\n",
(unsigned long long) debit_account,
(unsigned long long) credit_account,
base_url);
}
json_decref (json);
/* Finally build response object */
{
void *json_str;
size_t json_len;
json = json_pack ("{s:I}",
"serial_id",
(json_int_t) serial_id);
json_str = json_dumps (json,
JSON_INDENT(2));
json_decref (json);
if (NULL == json_str)
{
GNUNET_break (0);
return MHD_NO;
}
json_len = strlen (json_str);
resp = MHD_create_response_from_buffer (json_len,
json_str,
MHD_RESPMEM_MUST_FREE);
if (NULL == resp)
{
GNUNET_break (0);
free (json_str);
return MHD_NO;
}
(void) MHD_add_response_header (resp,
MHD_HTTP_HEADER_CONTENT_TYPE,
"application/json");
}
ret = MHD_queue_response (connection,
MHD_HTTP_OK,
resp);
MHD_destroy_response (resp);
return ret;
}
/**
* Handle incoming HTTP request for /history
*
* @param h the fakebank handle
* @param connection the connection
* @param con_cls place to store state, not used
* @return MHD result code
*/
static int
handle_history (struct TALER_FAKEBANK_Handle *h,
struct MHD_Connection *connection,
void **con_cls)
{
const char *auth;
const char *delta;
const char *start;
const char *dir;
const char *acc;
unsigned long long account_number;
unsigned long long start_number;
long long count;
enum TALER_BANK_Direction direction;
struct Transaction *pos;
json_t *history;
json_t *jresponse;
int ret;
auth = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"auth");
delta = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"delta");
dir = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"direction");
start = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"start");
acc = MHD_lookup_connection_value (connection,
MHD_GET_ARGUMENT_KIND,
"account_number");
if ( (NULL == auth) ||
(0 != strcasecmp (auth,
"basic")) ||
(NULL == acc) ||
(NULL == delta) )
{
/* Invalid request, given that this is fakebank we impolitely just
kill the connection instead of returning a nice error. */
GNUNET_break (0);
return MHD_NO;
}
if ( (1 != sscanf (delta,
"%lld",
&count)) ||
(1 != sscanf (acc,
"%llu",
&account_number)) ||
( (NULL != start) &&
(1 != sscanf (start,
"%llu",
&start_number)) ) ||
( (NULL != dir) &&
(0 != strcasecmp (dir,
"CREDIT")) &&
(0 != strcasecmp (dir,
"DEBIT")) ) )
{
/* Invalid request, given that this is fakebank we impolitely just
kill the connection instead of returning a nice error. */
GNUNET_break (0);
return MHD_NO;
}
if (NULL == dir)
direction = TALER_BANK_DIRECTION_BOTH;
else if (0 == strcasecmp (dir,
"CREDIT"))
direction = TALER_BANK_DIRECTION_CREDIT;
else
direction = TALER_BANK_DIRECTION_DEBIT;
if (NULL == start)
{
if (count > 0)
pos = h->transactions_head;
else
pos = h->transactions_tail;
}
else if (NULL != h->transactions_head)
{
for (pos = h->transactions_head;
NULL != pos;
pos = pos->next)
if (pos->serial_id == start_number)
break;
if (NULL == pos)
{
GNUNET_break (0);
return MHD_NO;
}
/* range is exclusive, skip the matching entry */
if (count > 0)
pos = pos->next;
if (count < 0)
pos = pos->prev;
}
else
{
/* list is empty */
pos = NULL;
}
history = json_array ();
while ( (NULL != pos) &&
(0 != count) )
{
json_t *trans;
char *subject;
if (! ( ( (account_number == pos->debit_account) &&
(0 != (direction & TALER_BANK_DIRECTION_DEBIT)) ) ||
( (account_number == pos->credit_account) &&
(0 != (direction & TALER_BANK_DIRECTION_CREDIT) ) ) ) )
{
if (count > 0)
pos = pos->next;
if (count < 0)
pos = pos->prev;
continue;
}
GNUNET_asprintf (&subject,
"%s %s",
pos->subject,
pos->exchange_base_url);
trans = json_pack ("{s:I, s:o, s:o, s:s, s:I, s:s}",
"row_id", (json_int_t) pos->serial_id,
"date", GNUNET_JSON_from_time_abs (pos->date),
"amount", TALER_JSON_from_amount (&pos->amount),
"sign", (account_number == pos->debit_account) ? "-" : "+",
"counterpart", (json_int_t) ( (account_number == pos->debit_account)
? pos->credit_account
: pos->debit_account),
"wt_subject", subject);
GNUNET_free (subject);
json_array_append (history,
trans);
if (count > 0)
{
pos = pos->next;
count--;
}
if (count < 0)
{
pos = pos->prev;
count++;
}
}
if (0 == json_array_size (history))
{
struct MHD_Response *resp;
json_decref (history);
resp = MHD_create_response_from_buffer (0,
"",
MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_response (connection,
MHD_HTTP_NO_CONTENT,
resp);
MHD_destroy_response (resp);
return ret;
}
jresponse = json_pack ("{s:o}",
"data", history);
if (NULL == jresponse)
{
GNUNET_break (0);
return MHD_NO;
}
/* Finally build response object */
{
struct MHD_Response *resp;
void *json_str;
size_t json_len;
json_str = json_dumps (jresponse,
JSON_INDENT(2));
json_decref (jresponse);
if (NULL == json_str)
{
GNUNET_break (0);
return MHD_NO;
}
json_len = strlen (json_str);
resp = MHD_create_response_from_buffer (json_len,
json_str,
MHD_RESPMEM_MUST_FREE);
if (NULL == resp)
{
GNUNET_break (0);
free (json_str);
return MHD_NO;
}
(void) MHD_add_response_header (resp,
MHD_HTTP_HEADER_CONTENT_TYPE,
"application/json");
ret = MHD_queue_response (connection,
MHD_HTTP_OK,
resp);
MHD_destroy_response (resp);
}
return ret;
}
/**
* Handle incoming HTTP request.
*
* @param cls a `struct TALER_FAKEBANK_Handle`
* @param connection the connection
* @param url the requested url
* @param method the method (POST, GET, ...)
* @param version HTTP version (ignored)
* @param upload_data request data
* @param upload_data_size size of @a upload_data in bytes
* @param con_cls closure for request (a `struct Buffer *`)
* @return MHD result code
*/
static int
handle_mhd_request (void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **con_cls)
{
struct TALER_FAKEBANK_Handle *h = cls;
if ( (0 == strcasecmp (url,
"/admin/add/incoming")) &&
(0 == strcasecmp (method,
MHD_HTTP_METHOD_POST)) )
return handle_admin_add_incoming (h,
connection,
upload_data,
upload_data_size,
con_cls);
if ( (0 == strcasecmp (url,
"/history")) &&
(0 == strcasecmp (method,
MHD_HTTP_METHOD_GET)) )
return handle_history (h,
connection,
con_cls);
/* Unexpected URI path, just close the connection. */
/* we're rather impolite here, but it's a testcase. */
GNUNET_break_op (0);
return MHD_NO;
}
/**
* Task run whenever HTTP server operations are pending.
*
* @param cls the `struct TALER_FAKEBANK_Handle`
*/
static void
run_mhd (void *cls);
/**
* Schedule MHD. This function should be called initially when an
* MHD is first getting its client socket, and will then automatically
* always be called later whenever there is work to be done.
*/
static void
schedule_httpd (struct TALER_FAKEBANK_Handle *h)
{
fd_set rs;
fd_set ws;
fd_set es;
struct GNUNET_NETWORK_FDSet *wrs;
struct GNUNET_NETWORK_FDSet *wws;
int max;
int haveto;
MHD_UNSIGNED_LONG_LONG timeout;
struct GNUNET_TIME_Relative tv;
FD_ZERO (&rs);
FD_ZERO (&ws);
FD_ZERO (&es);
max = -1;
if (MHD_YES != MHD_get_fdset (h->mhd_bank, &rs, &ws, &es, &max))
{
GNUNET_assert (0);
return;
}
haveto = MHD_get_timeout (h->mhd_bank, &timeout);
if (MHD_YES == haveto)
tv.rel_value_us = (uint64_t) timeout * 1000LL;
else
tv = GNUNET_TIME_UNIT_FOREVER_REL;
if (-1 != max)
{
wrs = GNUNET_NETWORK_fdset_create ();
wws = GNUNET_NETWORK_fdset_create ();
GNUNET_NETWORK_fdset_copy_native (wrs, &rs, max + 1);
GNUNET_NETWORK_fdset_copy_native (wws, &ws, max + 1);
}
else
{
wrs = NULL;
wws = NULL;
}
if (NULL != h->mhd_task)
GNUNET_SCHEDULER_cancel (h->mhd_task);
h->mhd_task =
GNUNET_SCHEDULER_add_select (GNUNET_SCHEDULER_PRIORITY_DEFAULT,
tv,
wrs,
wws,
&run_mhd, h);
if (NULL != wrs)
GNUNET_NETWORK_fdset_destroy (wrs);
if (NULL != wws)
GNUNET_NETWORK_fdset_destroy (wws);
}
/**
* Task run whenever HTTP server operations are pending.
*
* @param cls the `struct TALER_FAKEBANK_Handle`
*/
static void
run_mhd (void *cls)
{
struct TALER_FAKEBANK_Handle *h = cls;
h->mhd_task = NULL;
MHD_run (h->mhd_bank);
schedule_httpd (h);
}
/**
* Start the fake bank.
*
* @param port port to listen to
* @return NULL on error
*/
struct TALER_FAKEBANK_Handle *
TALER_FAKEBANK_start (uint16_t port)
{
struct TALER_FAKEBANK_Handle *h;
h = GNUNET_new (struct TALER_FAKEBANK_Handle);
h->mhd_bank = MHD_start_daemon (MHD_USE_DEBUG,
port,
NULL, NULL,
&handle_mhd_request, h,
MHD_OPTION_NOTIFY_COMPLETED,
&handle_mhd_completion_callback, h,
MHD_OPTION_END);
if (NULL == h->mhd_bank)
{
GNUNET_free (h);
return NULL;
}
schedule_httpd (h);
return h;
}
/* end of fakebank.c */
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