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lprm.c revision 1.20 
      1 /*	$NetBSD: lprm.c,v 1.20 2019/02/03 03:19:31 mrg Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 #ifndef lint
     35 __COPYRIGHT("@(#) Copyright (c) 1983, 1993\
     36  The Regents of the University of California.  All rights reserved.");
     37 #if 0
     38 static char sccsid[] = "@(#)lprm.c	8.1 (Berkeley) 6/6/93";
     39 #else
     40 __RCSID("$NetBSD: lprm.c,v 1.20 2019/02/03 03:19:31 mrg Exp $");
     41 #endif
     42 #endif /* not lint */
     43 
     44 /*
     45  * lprm - remove the current user's spool entry
     46  *
     47  * lprm [-] [[job #] [user] ...]
     48  *
     49  * Using information in the lock file, lprm will kill the
     50  * currently active daemon (if necessary), remove the associated files,
     51  * and startup a new daemon.  Privileged users may remove anyone's spool
     52  * entries, otherwise one can only remove their own.
     53  */
     54 
     55 #include <sys/param.h>
     56 
     57 #include <err.h>
     58 #include <syslog.h>
     59 #include <dirent.h>
     60 #include <pwd.h>
     61 #include <unistd.h>
     62 #include <stdlib.h>
     63 #include <stdio.h>
     64 #include <string.h>
     65 #include <ctype.h>
     66 
     67 #include "lp.h"
     68 #include "lp.local.h"
     69 
     70 /*
     71  * Stuff for handling job specifications
     72  */
     73 char	*person;		/* name of person doing lprm */
     74 int	 requ[MAXREQUESTS];	/* job number of spool entries */
     75 int	 requests;		/* # of spool requests */
     76 char	*user[MAXUSERS];	/* users to process */
     77 int	 users;			/* # of users in user array */
     78 uid_t	 uid, euid;		/* real and effective user id's */
     79 
     80 static char	luser[16];	/* buffer for person */
     81 
     82 static void usage(void) __dead;
     83 
     84 int
     85 main(int argc, char *argv[])
     86 {
     87 	char *arg;
     88 	struct passwd *p;
     89 
     90 	uid = getuid();
     91 	euid = geteuid();
     92 	seteuid(uid);	/* be safe */
     93 	setprogname(*argv);
     94 	gethostname(host, sizeof(host));
     95 	host[sizeof(host) - 1] = '\0';
     96 	openlog("lpd", 0, LOG_LPR);
     97 	if ((p = getpwuid(getuid())) == NULL)
     98 		fatal("Who are you?");
     99 	if (strlen(p->pw_name) >= sizeof(luser))
    100 		fatal("Your name is too long");
    101 	strlcpy(luser, p->pw_name, sizeof(luser));
    102 	person = luser;
    103 	while (--argc) {
    104 		if ((arg = *++argv)[0] == '-')
    105 			switch (arg[1]) {
    106 			case 'P':
    107 				if (arg[2])
    108 					printer = &arg[2];
    109 				else if (argc > 1) {
    110 					argc--;
    111 					printer = *++argv;
    112 				}
    113 				break;
    114 			case 'w':
    115 				if (arg[2])
    116 					wait_time = atoi(&arg[2]);
    117 				else if (argc > 1) {
    118 					argc--;
    119 					wait_time = atoi(*++argv);
    120 				}
    121 				if (wait_time < 0)
    122 					errx(1, "wait time must be positive: %d",
    123 					    wait_time);
    124 				if (wait_time < 30)
    125 				    warnx("warning: wait time less than 30 seconds");
    126 				break;
    127 			case '\0':
    128 				if (!users) {
    129 					users = -1;
    130 					break;
    131 				}
    132 				/* FALLTHROUGH */
    133 			default:
    134 				usage();
    135 			}
    136 		else {
    137 			if (users < 0)
    138 				usage();
    139 			if (isdigit((unsigned char)arg[0])) {
    140 				if (requests >= MAXREQUESTS)
    141 					fatal("Too many requests");
    142 				requ[requests++] = atoi(arg);
    143 			} else {
    144 				if (users >= MAXUSERS)
    145 					fatal("Too many users");
    146 				user[users++] = arg;
    147 			}
    148 		}
    149 	}
    150 	if (printer == NULL && (printer = getenv("PRINTER")) == NULL)
    151 		printer = DEFLP;
    152 
    153 	rmjob();
    154 	exit(0);
    155 }
    156 
    157 static void
    158 usage(void)
    159 {
    160 	(void)fprintf(stderr,
    161 	    "Usage: %s [-] [-Pprinter] [-w maxwait] [[job #] [user] ...]\n",
    162 	    getprogname());
    163 	exit(2);
    164 }
    165