update_totp_counter.c (2269B)
1 /* 2 This file is part of Anastasis 3 Copyright (C) 2026 Anastasis SARL 4 5 Anastasis is free software; you can redistribute it and/or modify it under the 6 terms of the GNU Affero General Public License as published by the Free Software 7 Foundation; either version 3, or (at your option) any later version. 8 9 Anastasis is distributed in the hope that it will be useful, but WITHOUT ANY 10 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR 11 A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details. 12 13 You should have received a copy of the GNU Affero General Public License along with 14 Anastasis; see the file COPYING.GPL. If not, see <http://www.gnu.org/licenses/> 15 */ 16 /** 17 * @file stasis/update_totp_counter.c 18 * @brief Anastasis database: accept a TOTP time step counter once 19 * @author Christian Grothoff 20 */ 21 #include "platform.h" 22 #include "anastasis-db_pg.h" 23 #include "anastasis/anastasis-database/update_totp_counter.h" 24 #include "anastasis/anastasis-database/transaction.h" 25 #include "anastasis/anastasis-database/preflight.h" 26 #include <taler/taler_pq_lib.h> 27 28 29 /** 30 * Consume the TOTP time step @a counter for @a truth_uuid. 31 * 32 * The comparison and the store are one statement on purpose: the row lock 33 * taken by the UPDATE is what keeps two requests that carry the same code from 34 * both being told they won. 35 * 36 * @param truth_uuid identification of the challenge the code belongs to 37 * @param counter time step counter the code was computed for 38 * @return transaction status 39 */ 40 enum GNUNET_DB_QueryStatus 41 ANASTASIS_DB_update_totp_counter ( 42 const struct ANASTASIS_CRYPTO_TruthUUIDP *truth_uuid, 43 uint64_t counter) 44 { 45 struct GNUNET_PQ_QueryParam params[] = { 46 GNUNET_PQ_query_param_auto_from_type (truth_uuid), 47 GNUNET_PQ_query_param_uint64 (&counter), 48 GNUNET_PQ_query_param_end 49 }; 50 51 PREPARE ("update_totp_counter", 52 "UPDATE anastasis_truth" 53 " SET last_totp_counter=$2" 54 " WHERE truth_uuid=$1" 55 " AND last_totp_counter < $2;"); 56 return GNUNET_PQ_eval_prepared_non_select (pg->conn, 57 "update_totp_counter", 58 params); 59 } 60 61 62 /* end of update_totp_counter.c */