/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (C) 1996
 *      David L. Nugent.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/wait.h>

#include <err.h>
#include <errno.h>
#include <pwd.h>
#include <libutil.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "pwupd.h"

char *
getpwpath(char const * file)
{
        static char pathbuf[MAXPATHLEN];

        snprintf(pathbuf, sizeof pathbuf, "%s/%s", conf.etcpath, file);

        return (pathbuf);
}

static int
pwdb_check(void)
{
        int             i = 0;
        pid_t           pid;
        char           *args[10];

        args[i++] = _PATH_PWD_MKDB;
        args[i++] = "-C";

        if (strcmp(conf.etcpath, _PATH_PWD) != 0) {
                args[i++] = "-d";
                args[i++] = conf.etcpath;
        }
        args[i++] = getpwpath(_MASTERPASSWD);
        args[i] = NULL;

        if ((pid = fork()) == -1)       /* Error (errno set) */
                i = errno;
        else if (pid == 0) {    /* Child */
                execv(args[0], args);
                _exit(1);
        } else {                /* Parent */
                waitpid(pid, &i, 0);
                if (WEXITSTATUS(i))
                        i = EIO;
        }

        return (i);
}

static int
pw_update(struct passwd * pwd, char const * user)
{
        struct passwd   *pw = NULL;
        struct passwd   *old_pw = NULL;
        int              rc, pfd, tfd;

        if ((rc = pwdb_check()) != 0)
                return (rc);

        if (pwd != NULL)
                pw = pw_dup(pwd);

        if (user != NULL)
                old_pw = GETPWNAM(user);

        if (pw_init(conf.etcpath, NULL))
                err(1, "pw_init()");
        if ((pfd = pw_lock()) == -1) {
                pw_fini();
                err(1, "pw_lock()");
        }
        if ((tfd = pw_tmp(-1)) == -1) {
                pw_fini();
                err(1, "pw_tmp()");
        }
        if (pw_copy(pfd, tfd, pw, old_pw) == -1) {
                pw_fini();
                close(tfd);
                err(1, "pw_copy()");
        }
        fsync(tfd);
        close(tfd);
        /*
         * in case of deletion of a user, the whole database
         * needs to be regenerated
         */
        if (pw_mkdb(pw != NULL ? pw->pw_name : NULL) == -1) {
                pw_fini();
                errx(1, "pw_mkdb()");
        }
        free(pw);
        pw_fini();

        return (0);
}

int
addpwent(struct passwd * pwd)
{

        return (pw_update(pwd, NULL));
}

int
chgpwent(char const * login, struct passwd * pwd)
{

        return (pw_update(pwd, login));
}

int
delpwent(struct passwd * pwd)
{

        return (pw_update(NULL, pwd->pw_name));
}