/*-
 * 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.
 *
 * $FreeBSD: src/usr.sbin/pw/pwupd.c,v 1.21 2008/07/17 13:47:59 jhb Exp $
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdarg.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/wait.h>

#include "pwupd.h"

#define HAVE_PWDB_C     1
#define HAVE_PWDB_U     1

static char pathpwd[] = _PATH_PWD;
static char * pwpath = pathpwd;
 
int
setpwdir(const char * dir)
{
        if (dir == NULL)
                return -1;
        else {
                char * d = malloc(strlen(dir)+1);
                if (d == NULL)
                        return -1;
                pwpath = strcpy(d, dir);
        }
        return 0;
}

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

        snprintf(pathbuf, sizeof pathbuf, "%s/%s", pwpath, file);
        return pathbuf;
}

int
pwdb(char *arg,...)
{
        int             i = 0;
        pid_t           pid;
        va_list         ap;
        char           *args[10];

        args[i++] = _PATH_PWD_MKDB;
        va_start(ap, arg);
        while (i < 6 && arg != NULL) {
                args[i++] = arg;
                arg = va_arg(ap, char *);
        }
        if (pwpath != pathpwd) {
                args[i++] = "-d";
                args[i++] = pwpath;
        }
        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;
}

int
fmtpwentry(char *buf, struct passwd * pwd, int type)
{
        int             l;
        char           *pw;

        pw = (type == PWF_MASTER) ?
            ((pwd->pw_passwd == NULL) ? "" : pwd->pw_passwd) : "*";

        if (type == PWF_PASSWD)
                l = sprintf(buf, "%s:*:%ld:%ld:%s:%s:%s\n",
                       pwd->pw_name, (long) pwd->pw_uid, (long) pwd->pw_gid,
                            pwd->pw_gecos ? pwd->pw_gecos : "User &",
                            pwd->pw_dir, pwd->pw_shell);
        else
                l = sprintf(buf, "%s:%s:%ld:%ld:%s:%lu:%lu:%s:%s:%s\n",
                   pwd->pw_name, pw, (long) pwd->pw_uid, (long) pwd->pw_gid,
                            pwd->pw_class ? pwd->pw_class : "",
                            (unsigned long) pwd->pw_change,
                            (unsigned long) pwd->pw_expire,
                            pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
        return l;
}


int
fmtpwent(char *buf, struct passwd * pwd)
{
        return fmtpwentry(buf, pwd, PWF_STANDARD);
}

static int
pw_update(struct passwd * pwd, char const * user, int mode)
{
        int             rc = 0;

        ENDPWENT();

        /*
         * First, let's check the see if the database is alright
         * Note: -C is only available in FreeBSD 2.2 and above
         */
#ifdef HAVE_PWDB_C
        rc = pwdb("-C", NULL);  /* Check only */
        if (rc == 0) {
#else
        {                               /* No -C */
#endif
                char            pfx[PWBUFSZ];
                char            pwbuf[PWBUFSZ];
                int             l = snprintf(pfx, PWBUFSZ, "%s:", user);
#ifdef HAVE_PWDB_U
                int             isrename = pwd!=NULL && strcmp(user, pwd->pw_name);
#endif

                /*
                 * Update the passwd file first
                 */
                if (pwd == NULL)
                        *pwbuf = '\0';
                else
                        fmtpwentry(pwbuf, pwd, PWF_PASSWD);

                if (l < 0)
                        l = 0;
                rc = fileupdate(getpwpath(_PASSWD), 0644, pwbuf, pfx, l, mode);
                if (rc == 0) {

                        /*
                         * Then the master.passwd file
                         */
                        if (pwd != NULL)
                                fmtpwentry(pwbuf, pwd, PWF_MASTER);
                        rc = fileupdate(getpwpath(_MASTERPASSWD), 0600, pwbuf, pfx, l, mode);
                        if (rc == 0) {
#ifdef HAVE_PWDB_U
                                if (mode == UPD_DELETE || isrename)
#endif
                                        rc = pwdb(NULL);
#ifdef HAVE_PWDB_U
                                else
                                        rc = pwdb("-u", user, NULL);
#endif
                        }
                }
        }
        return rc;
}

int
addpwent(struct passwd * pwd)
{
        return pw_update(pwd, pwd->pw_name, UPD_CREATE);
}

int
chgpwent(char const * login, struct passwd * pwd)
{
        return pw_update(pwd, login, UPD_REPLACE);
}

int
delpwent(struct passwd * pwd)
{
        return pw_update(NULL, pwd->pw_name, UPD_DELETE);
}