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/*
This file is part of TALER
(C) 2015--2019 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 wire/payto.c
* @brief Functions for parsing payto:// URIs
* @author Christian Grothoff <christian@grothoff.org>
*/
#include "platform.h"
#include "taler_util.h"
#include "taler_bank_service.h"
#include "taler_wire_lib.h"
/**
* Maximum legal 'value' for an account number, based on IEEE double (for JavaScript compatibility).
*/
#define MAX_ACCOUNT_NO (1LLU << 52)
/**
* Release memory allocated in @a acc.
*
* @param acc account to free, the pointer itself is NOT free'd.
*/
void
TALER_WIRE_account_free (struct TALER_Account *acc)
{
switch (acc->type)
{
case TALER_PAC_NONE:
return;
case TALER_PAC_X_TALER_BANK:
GNUNET_free (acc->details.x_taler_bank.hostname);
acc->details.x_taler_bank.hostname = NULL;
GNUNET_free (acc->details.x_taler_bank.account_base_url);
acc->details.x_taler_bank.account_base_url = NULL;
break;
case TALER_PAC_IBAN:
GNUNET_free (acc->details.iban.number);
acc->details.iban.number = NULL;
break;
}
acc->type = TALER_PAC_NONE;
}
/* Taken from GNU gettext */
/**
* Entry in the country table.
*/
struct CountryTableEntry
{
/**
* 2-Character international country code.
*/
const char *code;
/**
* Long English name of the country.
*/
const char *english;
};
/* Keep the following table in sync with gettext.
WARNING: the entries should stay sorted according to the code */
/**
* List of country codes.
*/
static const struct CountryTableEntry country_table[] = {
{ "AE", "U.A.E." },
{ "AF", "Afghanistan" },
{ "AL", "Albania" },
{ "AM", "Armenia" },
{ "AN", "Netherlands Antilles" },
{ "AR", "Argentina" },
{ "AT", "Austria" },
{ "AU", "Australia" },
{ "AZ", "Azerbaijan" },
{ "BA", "Bosnia and Herzegovina" },
{ "BD", "Bangladesh" },
{ "BE", "Belgium" },
{ "BG", "Bulgaria" },
{ "BH", "Bahrain" },
{ "BN", "Brunei Darussalam" },
{ "BO", "Bolivia" },
{ "BR", "Brazil" },
{ "BT", "Bhutan" },
{ "BY", "Belarus" },
{ "BZ", "Belize" },
{ "CA", "Canada" },
{ "CG", "Congo" },
{ "CH", "Switzerland" },
{ "CI", "Cote d'Ivoire" },
{ "CL", "Chile" },
{ "CM", "Cameroon" },
{ "CN", "People's Republic of China" },
{ "CO", "Colombia" },
{ "CR", "Costa Rica" },
{ "CS", "Serbia and Montenegro" },
{ "CZ", "Czech Republic" },
{ "DE", "Germany" },
{ "DK", "Denmark" },
{ "DO", "Dominican Republic" },
{ "DZ", "Algeria" },
{ "EC", "Ecuador" },
{ "EE", "Estonia" },
{ "EG", "Egypt" },
{ "ER", "Eritrea" },
{ "ES", "Spain" },
{ "ET", "Ethiopia" },
{ "FI", "Finland" },
{ "FO", "Faroe Islands" },
{ "FR", "France" },
{ "GB", "United Kingdom" },
{ "GD", "Caribbean" },
{ "GE", "Georgia" },
{ "GL", "Greenland" },
{ "GR", "Greece" },
{ "GT", "Guatemala" },
{ "HK", "Hong Kong" },
{ "HK", "Hong Kong S.A.R." },
{ "HN", "Honduras" },
{ "HR", "Croatia" },
{ "HT", "Haiti" },
{ "HU", "Hungary" },
{ "ID", "Indonesia" },
{ "IE", "Ireland" },
{ "IL", "Israel" },
{ "IN", "India" },
{ "IQ", "Iraq" },
{ "IR", "Iran" },
{ "IS", "Iceland" },
{ "IT", "Italy" },
{ "JM", "Jamaica" },
{ "JO", "Jordan" },
{ "JP", "Japan" },
{ "KE", "Kenya" },
{ "KG", "Kyrgyzstan" },
{ "KH", "Cambodia" },
{ "KR", "South Korea" },
{ "KW", "Kuwait" },
{ "KZ", "Kazakhstan" },
{ "LA", "Laos" },
{ "LB", "Lebanon" },
{ "LI", "Liechtenstein" },
{ "LK", "Sri Lanka" },
{ "LT", "Lithuania" },
{ "LU", "Luxembourg" },
{ "LV", "Latvia" },
{ "LY", "Libya" },
{ "MA", "Morocco" },
{ "MC", "Principality of Monaco" },
{ "MD", "Moldava" },
{ "MD", "Moldova" },
{ "ME", "Montenegro" },
{ "MK", "Former Yugoslav Republic of Macedonia" },
{ "ML", "Mali" },
{ "MM", "Myanmar" },
{ "MN", "Mongolia" },
{ "MO", "Macau S.A.R." },
{ "MT", "Malta" },
{ "MV", "Maldives" },
{ "MX", "Mexico" },
{ "MY", "Malaysia" },
{ "NG", "Nigeria" },
{ "NI", "Nicaragua" },
{ "NL", "Netherlands" },
{ "NO", "Norway" },
{ "NP", "Nepal" },
{ "NZ", "New Zealand" },
{ "OM", "Oman" },
{ "PA", "Panama" },
{ "PE", "Peru" },
{ "PH", "Philippines" },
{ "PK", "Islamic Republic of Pakistan" },
{ "PL", "Poland" },
{ "PR", "Puerto Rico" },
{ "PT", "Portugal" },
{ "PY", "Paraguay" },
{ "QA", "Qatar" },
{ "RE", "Reunion" },
{ "RO", "Romania" },
{ "RS", "Serbia" },
{ "RU", "Russia" },
{ "RW", "Rwanda" },
{ "SA", "Saudi Arabia" },
{ "SE", "Sweden" },
{ "SG", "Singapore" },
{ "SI", "Slovenia" },
{ "SK", "Slovak" },
{ "SN", "Senegal" },
{ "SO", "Somalia" },
{ "SR", "Suriname" },
{ "SV", "El Salvador" },
{ "SY", "Syria" },
{ "TH", "Thailand" },
{ "TJ", "Tajikistan" },
{ "TM", "Turkmenistan" },
{ "TN", "Tunisia" },
{ "TR", "Turkey" },
{ "TT", "Trinidad and Tobago" },
{ "TW", "Taiwan" },
{ "TZ", "Tanzania" },
{ "UA", "Ukraine" },
{ "US", "United States" },
{ "UY", "Uruguay" },
{ "VA", "Vatican" },
{ "VE", "Venezuela" },
{ "VN", "Viet Nam" },
{ "YE", "Yemen" },
{ "ZA", "South Africa" },
{ "ZW", "Zimbabwe" }
};
/**
* Country code comparator function, for binary search with bsearch().
*
* @param ptr1 pointer to a `struct table_entry`
* @param ptr2 pointer to a `struct table_entry`
* @return result of strncmp()'ing the 2-digit country codes of the entries
*/
static int
cmp_country_code (const void *ptr1,
const void *ptr2)
{
const struct CountryTableEntry *cc1 = ptr1;
const struct CountryTableEntry *cc2 = ptr2;
return strncmp (cc1->code,
cc2->code,
2);
}
/**
* Validates given IBAN according to the European Banking Standards. See:
* http://www.europeanpaymentscouncil.eu/documents/ECBS%20IBAN%20standard%20EBS204_V3.2.pdf
*
* @param iban the IBAN number to validate
* @return #GNUNET_YES if correctly formatted; #GNUNET_NO if not
*/
static int
validate_iban (const char *iban)
{
char cc[2];
char ibancpy[35];
struct CountryTableEntry cc_entry;
unsigned int len;
char *nbuf;
unsigned long long dividend;
unsigned long long remainder;
int nread;
int ret;
unsigned int i;
unsigned int j;
len = strlen (iban);
if (len > 34)
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"IBAN number too long to be valid\n");
return GNUNET_NO;
}
strncpy (cc, iban, 2);
strncpy (ibancpy, iban + 4, len - 4);
strncpy (ibancpy + len - 4, iban, 4);
ibancpy[len] = '\0';
cc_entry.code = cc;
cc_entry.english = NULL;
if (NULL ==
bsearch (&cc_entry,
country_table,
sizeof (country_table) / sizeof (struct CountryTableEntry),
sizeof (struct CountryTableEntry),
&cmp_country_code))
{
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"Country code `%c%c' not supported\n",
cc[0],
cc[1]);
return GNUNET_NO;
}
nbuf = GNUNET_malloc ((len * 2) + 1);
for (i = 0, j = 0; i < len; i++)
{
if (isalpha ((unsigned char) ibancpy[i]))
{
if (2 != snprintf (&nbuf[j],
3,
"%2u",
(ibancpy[i] - 'A' + 10)))
{
GNUNET_free (nbuf);
return GNUNET_NO;
}
j += 2;
continue;
}
nbuf[j] = ibancpy[i];
j++;
}
for (j = 0; '\0' != nbuf[j]; j++)
GNUNET_assert (isdigit ( (unsigned char) nbuf[j]));
GNUNET_assert (sizeof(dividend) >= 8);
remainder = 0;
for (unsigned int i = 0; i<j; i += 16)
{
if (1 !=
(ret = sscanf (&nbuf[i],
"%16llu %n",
÷nd,
&nread)))
{
GNUNET_free (nbuf);
GNUNET_break_op (0);
return GNUNET_NO;
}
if (0 != remainder)
dividend += remainder * (pow (10, nread));
remainder = dividend % 97;
}
GNUNET_free (nbuf);
if (1 == remainder)
return GNUNET_YES;
GNUNET_log (GNUNET_ERROR_TYPE_INFO,
"IBAN checksum wrong\n");
return GNUNET_NO;
}
/**
* Parse payto://iban/ account URL (only account information,
* wire subject and amount are ignored).
*
* @param account_url URL to parse
* @param account[out] set to information, can be NULL
* @return #TALER_EC_NONE if @a account_url is well-formed
*/
static enum TALER_ErrorCode
parse_payto_iban (const char *account_url,
struct TALER_Account *account)
{
const char *iban;
const char *q;
char *result;
#define PREFIX "payto://iban/"
if (0 != strncasecmp (account_url,
PREFIX,
strlen (PREFIX)))
return TALER_EC_PAYTO_WRONG_METHOD;
iban = &account_url[strlen (PREFIX)];
#undef PREFIX
q = strchr (iban,
'?');
if (NULL != q)
{
result = GNUNET_strndup (iban,
q - iban);
}
else
{
result = GNUNET_strdup (iban);
}
if (GNUNET_OK !=
validate_iban (result))
{
GNUNET_free (result);
return TALER_EC_PAYTO_MALFORMED;
}
if (NULL != account)
{
account->type = TALER_PAC_IBAN;
account->details.iban.number = result;
}
else
{
GNUNET_free (result);
}
return TALER_EC_NONE;
}
/**
* Parse payto://x-taler-bank/ account URL (only account information,
* wire subject and amount are ignored).
*
* @param account_url URL to parse
* @param account[out] set to information, can be NULL
* @return #TALER_EC_NONE if @a account_url is well-formed
*/
static enum TALER_ErrorCode
parse_payto_x_taler_bank (const char *account_url,
struct TALER_Account *r_account)
{
const char *hostname;
const char *account;
const char *q;
unsigned int port;
char *p;
#define PREFIX "payto://x-taler-bank/"
if (0 != strncasecmp (account_url,
PREFIX,
strlen (PREFIX)))
return TALER_EC_PAYTO_WRONG_METHOD;
hostname = &account_url[strlen (PREFIX)];
if (NULL == (account = strchr (hostname,
(unsigned char) '/')))
return TALER_EC_PAYTO_MALFORMED;
account++;
if (NULL == r_account)
return TALER_EC_NONE;
q = strchr (account,
(unsigned char) '?');
if (0 == q)
q = account + strlen (account);
r_account->details.x_taler_bank.hostname
= GNUNET_strndup (hostname,
account - hostname);
port = 443; /* if non given, equals 443. */
if (NULL != (p = strchr (r_account->details.x_taler_bank.hostname,
(unsigned char) ':')))
{
p++;
if (1 != sscanf (p,
"%u",
&port))
{
GNUNET_break (0);
TALER_LOG_ERROR ("Malformed host from payto:// URI\n");
GNUNET_free (r_account->details.x_taler_bank.hostname);
r_account->details.x_taler_bank.hostname = NULL;
return TALER_EC_PAYTO_MALFORMED;
}
}
if (443 != port)
{
GNUNET_assert
(GNUNET_SYSERR != GNUNET_asprintf
(&r_account->details.x_taler_bank.account_base_url,
"http://%s/%.*s",
r_account->details.x_taler_bank.hostname,
(int) (q - account),
account));
}
else
{
GNUNET_assert
(GNUNET_SYSERR != GNUNET_asprintf
(&r_account->details.x_taler_bank.account_base_url,
"https://%s/%.*s",
r_account->details.x_taler_bank.hostname,
(int) (q - account),
account));
}
r_account->type = TALER_PAC_X_TALER_BANK;
return TALER_EC_NONE;
}
typedef enum TALER_ErrorCode
(*Parser)(const char *account_url,
struct TALER_Account *r_account);
/**
* Parse @a payto_url and store the result in @a acc
*
* @param payto_url URL to parse
* @param acc[in,out] account to initialize, free using #TALER_WIRE_account_free() later
* @return #TALER_EC_NONE if @a payto_url is well-formed
*/
enum TALER_ErrorCode
TALER_WIRE_payto_to_account (const char *payto_url,
struct TALER_Account *acc)
{
Parser parsers[] = {
&parse_payto_x_taler_bank,
&parse_payto_iban,
NULL
};
for (unsigned int i = 0; NULL != parsers[i]; i++)
{
enum TALER_ErrorCode ec = parsers[i](payto_url,
acc);
if (TALER_EC_PAYTO_WRONG_METHOD == ec)
continue;
return ec;
}
return TALER_EC_PAYTO_WRONG_METHOD;
}
/* end of payto.c */
|