390 lines
9.2 KiB
C
390 lines
9.2 KiB
C
/* $NetBSD: rmjob.c,v 1.13 1997/10/05 15:12:04 mrg Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)rmjob.c 8.2 (Berkeley) 4/28/95";
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#else
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__RCSID("$NetBSD: rmjob.c,v 1.13 1997/10/05 15:12:04 mrg Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <signal.h>
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#include <errno.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include "lp.h"
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#include "lp.local.h"
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#include "pathnames.h"
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/*
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* rmjob - remove the specified jobs from the queue.
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*/
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/*
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* Stuff for handling lprm specifications
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*/
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extern char *user[]; /* users to process */
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extern int users; /* # of users in user array */
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extern int requ[]; /* job number of spool entries */
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extern int requests; /* # of spool requests */
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extern char *person; /* name of person doing lprm */
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static char root[] = "root";
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static int all = 0; /* eliminate all files (root only) */
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static int cur_daemon; /* daemon's pid */
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static char current[40]; /* active control file name */
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extern uid_t uid, euid; /* real and effective user id's */
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static void do_unlink __P((char *));
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void
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rmjob()
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{
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int i, nitems;
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int assasinated = 0;
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struct dirent **files;
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char *cp;
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if ((i = cgetent(&bp, printcapdb, printer)) == -2)
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fatal("can't open printer description file");
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else if (i == -1)
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fatal("unknown printer");
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else if (i == -3)
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fatal("potential reference loop detected in printcap file");
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if (cgetstr(bp, "lp", &LP) < 0)
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LP = _PATH_DEFDEVLP;
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if (cgetstr(bp, "rp", &RP) < 0)
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RP = DEFLP;
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if (cgetstr(bp, "sd", &SD) < 0)
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SD = _PATH_DEFSPOOL;
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if (cgetstr(bp,"lo", &LO) < 0)
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LO = DEFLOCK;
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cgetstr(bp, "rm", &RM);
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if ((cp = checkremote()) != NULL)
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printf("Warning: %s\n", cp);
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/*
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* If the format was `lprm -' and the user isn't the super-user,
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* then fake things to look like he said `lprm user'.
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*/
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if (users < 0) {
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if (getuid() == 0)
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all = 1; /* all files in local queue */
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else {
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user[0] = person;
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users = 1;
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}
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}
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if (!strcmp(person, "-all")) {
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if (from == host)
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fatal("The login name \"-all\" is reserved");
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all = 1; /* all those from 'from' */
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person = root;
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}
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seteuid(euid);
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if (chdir(SD) < 0)
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fatal("cannot chdir to spool directory");
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if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
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fatal("cannot access spool directory");
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seteuid(uid);
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if (nitems) {
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/*
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* Check for an active printer daemon (in which case we
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* kill it if it is reading our file) then remove stuff
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* (after which we have to restart the daemon).
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*/
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if (lockchk(LO) && chk(current)) {
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seteuid(euid);
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assasinated = kill(cur_daemon, SIGINT) == 0;
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seteuid(uid);
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if (!assasinated)
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fatal("cannot kill printer daemon");
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}
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/*
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* process the files
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*/
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for (i = 0; i < nitems; i++)
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process(files[i]->d_name);
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}
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rmremote();
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/*
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* Restart the printer daemon if it was killed
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*/
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if (assasinated && !startdaemon(printer))
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fatal("cannot restart printer daemon\n");
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exit(0);
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}
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/*
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* Process a lock file: collect the pid of the active
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* daemon and the file name of the active spool entry.
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* Return boolean indicating existence of a lock file.
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*/
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int
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lockchk(s)
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char *s;
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{
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FILE *fp;
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int i, n;
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seteuid(euid);
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if ((fp = fopen(s, "r")) == NULL) {
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if (errno == EACCES)
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fatal("can't access lock file");
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else
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return(0);
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}
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seteuid(uid);
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if (!getline(fp)) {
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(void)fclose(fp);
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return(0); /* no daemon present */
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}
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cur_daemon = atoi(line);
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if (kill(cur_daemon, 0) < 0 && errno != EPERM) {
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(void)fclose(fp);
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return(0); /* no daemon present */
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}
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for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) {
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if (i > 5) {
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n = 1;
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break;
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}
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sleep(i);
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}
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current[n-1] = '\0';
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(void)fclose(fp);
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return(1);
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}
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/*
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* Process a control file.
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*/
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void
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process(file)
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char *file;
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{
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FILE *cfp;
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if (!chk(file))
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return;
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seteuid(euid);
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if ((cfp = fopen(file, "r")) == NULL)
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fatal("cannot open %s", file);
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seteuid(uid);
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while (getline(cfp)) {
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switch (line[0]) {
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case 'U': /* unlink associated files */
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if (strchr(line+1, '/') || strncmp(line+1, "df", 2))
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break;
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do_unlink(line+1);
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}
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}
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(void)fclose(cfp);
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do_unlink(file);
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}
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static void
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do_unlink(file)
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char *file;
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{
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int ret;
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if (from != host)
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printf("%s: ", host);
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seteuid(euid);
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ret = unlink(file);
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seteuid(uid);
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printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file);
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}
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/*
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* Do the dirty work in checking
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*/
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int
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chk(file)
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char *file;
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{
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int *r, n;
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char **u, *cp;
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FILE *cfp;
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/*
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* Check for valid cf file name (mostly checking current).
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*/
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if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f')
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return(0);
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if (all && (from == host || !strcmp(from, file+6)))
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return(1);
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/*
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* get the owner's name from the control file.
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*/
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seteuid(euid);
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if ((cfp = fopen(file, "r")) == NULL)
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return(0);
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seteuid(uid);
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while (getline(cfp)) {
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if (line[0] == 'P')
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break;
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}
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(void)fclose(cfp);
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if (line[0] != 'P')
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return(0);
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if (users == 0 && requests == 0)
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return(!strcmp(file, current) && isowner(line+1, file));
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/*
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* Check the request list
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*/
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for (n = 0, cp = file+3; isdigit(*cp); )
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n = n * 10 + (*cp++ - '0');
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for (r = requ; r < &requ[requests]; r++)
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if (*r == n && isowner(line+1, file))
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return(1);
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/*
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* Check to see if it's in the user list
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*/
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for (u = user; u < &user[users]; u++)
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if (!strcmp(*u, line+1) && isowner(line+1, file))
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return(1);
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return(0);
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}
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/*
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* If root is removing a file on the local machine, allow it.
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* If root is removing a file from a remote machine, only allow
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* files sent from the remote machine to be removed.
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* Normal users can only remove the file from where it was sent.
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*/
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int
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isowner(owner, file)
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char *owner, *file;
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{
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if (!strcmp(person, root) && (from == host || !strcmp(from, file+6)))
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return(1);
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if (!strcmp(person, owner) && !strcmp(from, file+6))
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return(1);
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if (from != host)
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printf("%s: ", host);
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printf("%s: Permission denied\n", file);
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return(0);
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}
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/*
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* Check to see if we are sending files to a remote machine. If we are,
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* then try removing files on the remote machine.
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*/
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void
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rmremote()
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{
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char *cp, *s;
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int i, rem, len;
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if (!remote)
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return; /* not sending to a remote machine */
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/*
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* Flush stdout so the user can see what has been deleted
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* while we wait (possibly) for the connection.
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*/
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fflush(stdout);
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/* \5 RP space all */
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len = 1 + strlen(RP) + 1 + strlen(all ? "-all" : person);
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for (i = 0; i < users; i++) {
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len += strlen(user[i]) + 1;
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}
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for (i = 0; i < requests; i++) {
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len += snprintf(line, sizeof(line), " %d", requ[i]);
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}
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/* newline nul */
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len += 2;
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if (len > sizeof(line))
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s = malloc(len);
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else
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s = line;
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cp = s;
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cp += snprintf(s, len, "\5%s %s", RP, all ? "-all" : person);
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for (i = 0; i < users; i++) {
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*cp++ = ' ';
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strncpy(cp, user[i], len - (cp - s) - 2);
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cp += strlen(cp);
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}
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for (i = 0; i < requests; i++) {
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(void)snprintf(cp, len - (cp - s) - 1, " %d", requ[i]);
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cp += strlen(cp);
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}
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cp[0] = '\n';
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cp[1] = '\0';
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rem = getport(RM, 0);
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if (rem < 0) {
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if (from != host)
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printf("%s: ", host);
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printf("connection to %s is down\n", RM);
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} else {
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if (write(rem, s, len) != len)
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fatal("Lost connection");
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if (len > sizeof(line))
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(void)free(s);
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while ((i = read(rem, line, sizeof(line))) > 0)
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(void)fwrite(line, 1, i, stdout);
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(void)close(rem);
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}
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}
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/*
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* Return 1 if the filename begins with 'cf'
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*/
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int
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iscf(d)
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struct dirent *d;
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{
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return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
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}
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