/*-
 * 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 <err.h>
#include <fcntl.h>
#include <locale.h>
#include <string.h>
#include <sysexits.h>
#include <unistd.h>

#include "pw.h"

const char     *Modes[] = {
  "add", "del", "mod", "show", "next",
  NULL};
const char     *Which[] = {"user", "group", NULL};
static const char *Combo1[] = {
  "useradd", "userdel", "usermod", "usershow", "usernext",
  "lock", "unlock",
  "groupadd", "groupdel", "groupmod", "groupshow", "groupnext",
  NULL};
static const char *Combo2[] = {
  "adduser", "deluser", "moduser", "showuser", "nextuser",
  "lock", "unlock",
  "addgroup", "delgroup", "modgroup", "showgroup", "nextgroup",
  NULL};

struct pwf PWF =
{
        PWF_REGULAR,
        setpwent,
        endpwent,
        getpwent,
        getpwuid,
        getpwnam,
        setgrent,
        endgrent,
        getgrent,
        getgrgid,
        getgrnam,

};
struct pwf VPWF =
{
        PWF_ALT,
        vsetpwent,
        vendpwent,
        vgetpwent,
        vgetpwuid,
        vgetpwnam,
        vsetgrent,
        vendgrent,
        vgetgrent,
        vgetgrgid,
        vgetgrnam,
};

static int (*cmdfunc[W_NUM][M_NUM])(int argc, char **argv, char *_name) = {
        { /* user */
                pw_user_add,
                pw_user_del,
                pw_user_mod,
                pw_user_show,
                pw_user_next,
                pw_user_lock,
                pw_user_unlock,
        },
        { /* group */
                pw_group_add,
                pw_group_del,
                pw_group_mod,
                pw_group_show,
                pw_group_next,
        }
};

struct pwconf conf;

static int      mode = -1;
static int      which = -1;

static int      getindex(const char *words[], const char *word);
static void     cmdhelp(int mode, int which);

int
main(int argc, char *argv[])
{
        int             tmp;
        struct stat     st;
        char            arg, *arg1;
        bool            relocated, nis;

        arg1 = NULL;
        relocated = nis = false;
        memset(&conf, 0, sizeof(conf));
        strlcpy(conf.rootdir, "/", sizeof(conf.rootdir));
        strlcpy(conf.etcpath, _PATH_PWD, sizeof(conf.etcpath));
        conf.fd = -1;
        conf.checkduplicate = true;

        setlocale(LC_ALL, "");

        /*
         * Break off the first couple of words to determine what exactly
         * we're being asked to do
         */
        while (argc > 1) {
                if (*argv[1] == '-') {
                        /*
                         * Special case, allow pw -V<dir> <operation> [args] for
                         * scripts etc.
                         *
                         * The -M option before the keyword is handled
                         * differently from -M after a keyword.
                         */
                        arg = argv[1][1];
                        if (arg == 'V' || arg == 'R') {
                                if (relocated)
                                        errx(EXIT_FAILURE, "Both '-R' and '-V' "
                                            "specified, only one accepted");
                                relocated = true;
                                optarg = &argv[1][2];
                                if (*optarg == '\0') {
                                        if (stat(argv[2], &st) != 0)
                                                errx(EX_OSFILE,
                                                    "no such directory `%s'",
                                                    argv[2]);
                                        if (!S_ISDIR(st.st_mode))
                                                errx(EX_OSFILE,
                                                    "`%s' not a directory",
                                                    argv[2]);
                                        optarg = argv[2];
                                        ++argv;
                                        --argc;
                                }
                                memcpy(&PWF, &VPWF, sizeof PWF);
                                if (arg == 'R') {
                                        strlcpy(conf.rootdir, optarg,
                                            sizeof(conf.rootdir));
                                        PWF._altdir = PWF_ROOTDIR;
                                }
                                snprintf(conf.etcpath, sizeof(conf.etcpath),
                                    "%s%s", optarg, arg == 'R' ?
                                    _PATH_PWD : "");
                                conf.altroot = true;
                        } else if (mode == -1 && which == -1 && arg == 'M') {
                                int fd;

                                optarg = &argv[1][2];
                                if (*optarg == '\0') {
                                        optarg = argv[2];
                                        ++argv;
                                        --argc;
                                }
                                fd = open(optarg,
                                    O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC,
                                    0644);
                                if (fd == -1)
                                        errx(EX_OSERR,
                                            "Cannot open metalog `%s'",
                                            optarg);
                                conf.metalog = fdopen(fd, "ae");
                        } else
                                break;
                } else if (mode == -1 && (tmp = getindex(Modes, argv[1])) != -1)
                        mode = tmp;
                else if (which == -1 && (tmp = getindex(Which, argv[1])) != -1)
                        which = tmp;
                else if ((mode == -1 && which == -1) &&
                         ((tmp = getindex(Combo1, argv[1])) != -1 ||
                          (tmp = getindex(Combo2, argv[1])) != -1)) {
                        which = tmp / M_NUM;
                        mode = tmp % M_NUM;
                } else if (strcmp(argv[1], "help") == 0 && argv[2] == NULL)
                        cmdhelp(mode, which);
                else if (which != -1 && mode != -1)
                        arg1 = argv[1];
                else
                        errx(EX_USAGE, "unknown keyword `%s'", argv[1]);
                ++argv;
                --argc;
        }

        /*
         * Bail out unless the user is specific!
         */
        if (mode == -1 || which == -1)
                cmdhelp(mode, which);

        conf.rootfd = open(conf.rootdir, O_DIRECTORY|O_CLOEXEC);
        if (conf.rootfd == -1)
                errx(EXIT_FAILURE, "Unable to open '%s'", conf.rootdir);

        if (conf.metalog != NULL && (which != W_USER || mode != M_ADD))
                errx(EXIT_FAILURE,
            "metalog can only be specified with 'useradd'");

        return (cmdfunc[which][mode](argc, argv, arg1));
}


static int
getindex(const char *words[], const char *word)
{
        int     i = 0;

        while (words[i]) {
                if (strcmp(words[i], word) == 0)
                        return (i);
                i++;
        }
        return (-1);
}


/*
 * This is probably an overkill for a cmdline help system, but it reflects
 * the complexity of the command line.
 */

static void
cmdhelp(int mode, int which)
{
        if (which == -1)
                fprintf(stderr, "usage:\n  pw [user|group|lock|unlock] [add|del|mod|show|next] [help|switches/values]\n");
        else if (mode == -1)
                fprintf(stderr, "usage:\n  pw %s [add|del|mod|show|next] [help|switches/values]\n", Which[which]);
        else {

                /*
                 * We need to give mode specific help
                 */
                static const char *help[W_NUM][M_NUM] =
                {
                        {
                                "usage: pw [-M metalog] useradd [name] [switches]\n"
                                "\t-V etcdir      alternate /etc location\n"
                                "\t-R rootdir     alternate root directory\n"
                                "\t-C config      configuration file\n"
                                "\t-M metalog     mtree file, must precede 'useradd'\n"
                                "\t-q             quiet operation\n"
                                "  Adding users:\n"
                                "\t-n name        login name\n"
                                "\t-u uid         user id\n"
                                "\t-c comment     user name/comment\n"
                                "\t-d directory   home directory\n"
                                "\t-e date        account expiry date\n"
                                "\t-p date        password expiry date\n"
                                "\t-g grp         initial group\n"
                                "\t-G grp1,grp2   additional groups\n"
                                "\t-m [ -k dir ]  create and set up home\n"
                                "\t-M mode        home directory permissions\n"
                                "\t-s shell       name of login shell\n"
                                "\t-o             duplicate uid ok\n"
                                "\t-L class       user class\n"
                                "\t-h fd          read password on fd\n"
                                "\t-H fd          read encrypted password on fd\n"
                                "\t-Y             update NIS maps\n"
                                "\t-N             no update\n"
                                "  Setting defaults:\n"
                                "\t-D             set user defaults\n"
                                "\t-b dir         default home root dir\n"
                                "\t-e period      default expiry period\n"
                                "\t-p period      default password change period\n"
                                "\t-g group       default group\n"
                                "\t-G grp1,grp2   additional groups\n"
                                "\t-L class       default user class\n"
                                "\t-k dir         default home skeleton\n"
                                "\t-M mode        home directory permissions\n"
                                "\t-u min,max     set min,max uids\n"
                                "\t-i min,max     set min,max gids\n"
                                "\t-w method      set default password method\n"
                                "\t-s shell       default shell\n"
                                "\t-y path        set NIS passwd file path\n",
                                "usage: pw userdel [uid|name] [switches]\n"
                                "\t-V etcdir      alternate /etc location\n"
                                "\t-R rootdir     alternate root directory\n"
                                "\t-n name        login name\n"
                                "\t-u uid         user id\n"
                                "\t-Y             update NIS maps\n"
                                "\t-y path        set NIS passwd file path\n"
                                "\t-r             remove home & contents\n",
                                "usage: pw usermod [uid|name] [switches]\n"
                                "\t-V etcdir      alternate /etc location\n"
                                "\t-R rootdir     alternate root directory\n"
                                "\t-C config      configuration file\n"
                                "\t-q             quiet operation\n"
                                "\t-F             force add if no user\n"
                                "\t-n name        login name\n"
                                "\t-u uid         user id\n"
                                "\t-c comment     user name/comment\n"
                                "\t-d directory   home directory\n"
                                "\t-e date        account expiry date\n"
                                "\t-p date        password expiry date\n"
                                "\t-g grp         initial group\n"
                                "\t-G grp1,grp2   additional groups\n"
                                "\t-l name        new login name\n"
                                "\t-L class       user class\n"
                                "\t-m [ -k dir ]  create and set up home\n"
                                "\t-M mode        home directory permissions\n"
                                "\t-s shell       name of login shell\n"
                                "\t-w method      set new password using method\n"
                                "\t-h fd          read password on fd\n"
                                "\t-H fd          read encrypted password on fd\n"
                                "\t-Y             update NIS maps\n"
                                "\t-y path        set NIS passwd file path\n"
                                "\t-N             no update\n",
                                "usage: pw usershow [uid|name] [switches]\n"
                                "\t-V etcdir      alternate /etc location\n"
                                "\t-R rootdir     alternate root directory\n"
                                "\t-n name        login name\n"
                                "\t-u uid         user id\n"
                                "\t-F             force print\n"
                                "\t-P             prettier format\n"
                                "\t-a             print all users\n"
                                "\t-7             print in v7 format\n",
                                "usage: pw usernext [switches]\n"
                                "\t-V etcdir      alternate /etc location\n"
                                "\t-R rootdir     alternate root directory\n"
                                "\t-C config      configuration file\n"
                                "\t-q             quiet operation\n",
                                "usage pw: lock [switches]\n"
                                "\t-V etcdir      alternate /etc locations\n"
                                "\t-C config      configuration file\n"
                                "\t-q             quiet operation\n",
                                "usage pw: unlock [switches]\n"
                                "\t-V etcdir      alternate /etc locations\n"
                                "\t-C config      configuration file\n"
                                "\t-q             quiet operation\n"
                        },
                        {
                                "usage: pw groupadd [group|gid] [switches]\n"
                                "\t-V etcdir      alternate /etc location\n"
                                "\t-R rootdir     alternate root directory\n"
                                "\t-C config      configuration file\n"
                                "\t-q             quiet operation\n"
                                "\t-n group       group name\n"
                                "\t-g gid         group id\n"
                                "\t-M usr1,usr2   add users as group members\n"
                                "\t-o             duplicate gid ok\n"
                                "\t-Y             update NIS maps\n"
                                "\t-N             no update\n",
                                "usage: pw groupdel [group|gid] [switches]\n"
                                "\t-V etcdir      alternate /etc location\n"
                                "\t-R rootdir     alternate root directory\n"
                                "\t-n name        group name\n"
                                "\t-g gid         group id\n"
                                "\t-Y             update NIS maps\n",
                                "usage: pw groupmod [group|gid] [switches]\n"
                                "\t-V etcdir      alternate /etc location\n"
                                "\t-R rootdir     alternate root directory\n"
                                "\t-C config      configuration file\n"
                                "\t-q             quiet operation\n"
                                "\t-F             force add if not exists\n"
                                "\t-n name        group name\n"
                                "\t-g gid         group id\n"
                                "\t-M usr1,usr2   replaces users as group members\n"
                                "\t-m usr1,usr2   add users as group members\n"
                                "\t-d usr1,usr2   delete users as group members\n"
                                "\t-l name        new group name\n"
                                "\t-Y             update NIS maps\n"
                                "\t-N             no update\n",
                                "usage: pw groupshow [group|gid] [switches]\n"
                                "\t-V etcdir      alternate /etc location\n"
                                "\t-R rootdir     alternate root directory\n"
                                "\t-n name        group name\n"
                                "\t-g gid         group id\n"
                                "\t-F             force print\n"
                                "\t-P             prettier format\n"
                                "\t-a             print all accounting groups\n",
                                "usage: pw groupnext [switches]\n"
                                "\t-V etcdir      alternate /etc location\n"
                                "\t-R rootdir     alternate root directory\n"
                                "\t-C config      configuration file\n"
                                "\t-q             quiet operation\n"
                        }
                };

                fprintf(stderr, "%s", help[which][mode]);
        }
        exit(EX_USAGE);
}

void
usage(void)
{
        cmdhelp(mode, which);
}