/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "apr.h"
#include "apr_lib.h"
#include "apr_strings.h"
#include "apr_errno.h"
#include "apr_file_io.h"
#include "apr_general.h"
#include "apr_version.h"
#if !APR_VERSION_AT_LEAST(2,0,0)
#include "apu_version.h"
#endif

#define MAX_STRING_LEN 256

#define ALG_PLAIN 0
#define ALG_CRYPT 1
#define ALG_APMD5 2
#define ALG_APSHA 3
#define ALG_BCRYPT 4

#define BCRYPT_DEFAULT_COST 5

#define ERR_FILEPERM 1
#define ERR_SYNTAX 2
#define ERR_PWMISMATCH 3
#define ERR_INTERRUPTED 4
#define ERR_OVERFLOW 5
#define ERR_BADUSER 6
#define ERR_INVALID 7
#define ERR_RANDOM 8
#define ERR_GENERAL 9
#define ERR_ALG_NOT_SUPP 10

#define NL APR_EOL_STR

#if defined(WIN32) || defined(NETWARE)
#define CRYPT_ALGO_SUPPORTED 0
#define PLAIN_ALGO_SUPPORTED 1
#else
#define CRYPT_ALGO_SUPPORTED 1
#define PLAIN_ALGO_SUPPORTED 0
#endif

#if APR_VERSION_AT_LEAST(2,0,0) || \
    (APU_MAJOR_VERSION == 1 && APU_MINOR_VERSION >= 5)
#define BCRYPT_ALGO_SUPPORTED 1
#else
#define BCRYPT_ALGO_SUPPORTED 0
#endif

/*
 * Must be initialized with apr_file_open_stderr() before using any of the
 * below functions.
 */
extern apr_file_t *errfile;

struct passwd_ctx {
    apr_pool_t      *pool;
    const char      *errstr;
    char            *out;
    apr_size_t      out_len;
    char            *passwd;
    int             alg;
    int             cost;
    enum {
        PW_PROMPT = 0,
        PW_ARG,
        PW_STDIN
    } passwd_src;
};

/*
 * Write a line to the file. On error, print a message and exit
 */
void putline(apr_file_t *f, const char *l);

/*
 * The following functions return zero on success; otherwise, one of
 * the ERR_* codes is returned and an error message is stored in ctx->errstr.
 */

/*
 * Parse the algorithm specific options.
 */
int parse_common_options(struct passwd_ctx *ctx, char opt, const char *opt_arg);

/*
 * Ask for password with verification.
 */
int get_password(struct passwd_ctx *ctx);

/*
 * Make a password record from the given information.
 */
int mkhash(struct passwd_ctx *ctx);