/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  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.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS 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 "lp.cdefs.h"           /* A cross-platform version of <sys/cdefs.h> */
/*
 * lprm - remove the current user's spool entry
 *
 * lprm [-] [[job #] [user] ...]
 *
 * Using information in the lock file, lprm will kill the
 * currently active daemon (if necessary), remove the associated files,
 * and startup a new daemon.  Priviledged users may remove anyone's spool
 * entries, otherwise one can only remove their own.
 */

#include <sys/param.h>

#include <syslog.h>
#include <dirent.h>
#include <err.h>
#include <pwd.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "lp.h"
#include "lp.local.h"

/*
 * Stuff for handling job specifications
 */
char    *person;                /* name of person doing lprm */
int      requ[MAXREQUESTS];     /* job number of spool entries */
int      requests;              /* # of spool requests */
char    *user[MAXUSERS];        /* users to process */
int      users;                 /* # of users in user array */
uid_t    uid, euid;             /* real and effective user id's */

static char     luser[16];      /* buffer for person */

int              main(int argc, char *_argv[]);
static void      usage(void);

int
main(int argc, char *argv[])
{
        char *arg;
        const char *printer;
        struct passwd *p;
        static char root[] = "root";

        printer = NULL;
        uid = getuid();
        euid = geteuid();
        PRIV_END        /* be safe */
        progname = argv[0];
        gethostname(local_host, sizeof(local_host));
        openlog("lpd", 0, LOG_LPR);

        /*
         * Bogus code later checks for string equality between 
         * `person' and "root", so if we are root, better make sure
         * that code will succeed.
         */
        if (getuid() == 0) {
                person = root;
        } else if ((person = getlogin()) == NULL) {
                if ((p = getpwuid(getuid())) == NULL)
                        fatal(0, "Who are you?");
                if (strlen(p->pw_name) >= sizeof(luser))
                        fatal(0, "Your name is too long");
                strcpy(luser, p->pw_name);
                person = luser;
        }
        while (--argc) {
                if ((arg = *++argv)[0] == '-')
                        switch (arg[1]) {
                        case 'P':
                                if (arg[2])
                                        printer = &arg[2];
                                else if (argc > 1) {
                                        argc--;
                                        printer = *++argv;
                                }
                                break;
                        case '\0':
                                if (!users) {
                                        users = -1;
                                        break;
                                }
                        default:
                                usage();
                        }
                else {
                        if (users < 0)
                                usage();
                        if (isdigit(arg[0])) {
                                if (requests >= MAXREQUESTS)
                                        fatal(0, "Too many requests");
                                requ[requests++] = atoi(arg);
                        } else {
                                if (users >= MAXUSERS)
                                        fatal(0, "Too many users");
                                user[users++] = arg;
                        }
                }
        }
        if (printer == NULL && (printer = getenv("PRINTER")) == NULL)
                printer = DEFLP;

        rmjob(printer);
        exit(0);
}

static void
usage(void)
{
        fprintf(stderr, "usage: lprm [-] [-Pprinter] [[job #] [user] ...]\n");
        exit(2);
}