1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if 0
33#ifndef lint
34static char sccsid[] = "@(#)rmjob.c	8.2 (Berkeley) 4/28/95";
35#endif /* not lint */
36#endif
37
38#include "lp.cdefs.h"		/* A cross-platform version of <sys/cdefs.h> */
39__FBSDID("$FreeBSD$");
40
41#include <sys/param.h>
42#include <sys/uio.h>
43
44#include <ctype.h>
45#include <dirent.h>
46#include <err.h>
47#include <errno.h>
48#include <signal.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#define psignal foil_gcc_psignal
53#define	sys_siglist foil_gcc_siglist
54#include <unistd.h>
55#undef psignal
56#undef sys_siglist
57
58#include "lp.h"
59#include "lp.local.h"
60#include "pathnames.h"
61
62/*
63 * rmjob - remove the specified jobs from the queue.
64 */
65
66/*
67 * Stuff for handling lprm specifications
68 */
69static char	root[] = "root";
70static int	all = 0;		/* eliminate all files (root only) */
71static int	cur_daemon;		/* daemon's pid */
72static char	current[7+MAXHOSTNAMELEN];  /* active control file name */
73
74static	void	alarmhandler(int _signo);
75static	void	do_unlink(char *_file);
76static int	 isowner(char *_owner, char *_file, const char *_cfhost);
77
78void
79rmjob(const char *printer)
80{
81	register int i, nitems;
82	int assassinated = 0;
83	struct dirent **files;
84	char *cp;
85	struct printer myprinter, *pp = &myprinter;
86
87	init_printer(pp);
88	if ((i = getprintcap(printer, pp)) < 0)
89		fatal(pp, "getprintcap: %s", pcaperr(i));
90	if ((cp = checkremote(pp))) {
91		printf("Warning: %s\n", cp);
92		free(cp);
93	}
94
95	/*
96	 * If the format was `lprm -' and the user isn't the super-user,
97	 *  then fake things to look like he said `lprm user'.
98	 */
99	if (users < 0) {
100		if (getuid() == 0)
101			all = 1;	/* all files in local queue */
102		else {
103			user[0] = person;
104			users = 1;
105		}
106	}
107	if (!strcmp(person, "-all")) {
108		if (from_host == local_host)
109			fatal(pp, "The login name \"-all\" is reserved");
110		all = 1;	/* all those from 'from_host' */
111		person = root;
112	}
113
114	PRIV_START
115	if (chdir(pp->spool_dir) < 0)
116		fatal(pp, "cannot chdir to spool directory");
117	if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
118		fatal(pp, "cannot access spool directory");
119	PRIV_END
120
121	if (nitems) {
122		/*
123		 * Check for an active printer daemon (in which case we
124		 *  kill it if it is reading our file) then remove stuff
125		 *  (after which we have to restart the daemon).
126		 */
127		if (lockchk(pp, pp->lock_file) && chk(current)) {
128			PRIV_START
129			assassinated = kill(cur_daemon, SIGINT) == 0;
130			PRIV_END
131			if (!assassinated)
132				fatal(pp, "cannot kill printer daemon");
133		}
134		/*
135		 * process the files
136		 */
137		for (i = 0; i < nitems; i++)
138			process(pp, files[i]->d_name);
139	}
140	rmremote(pp);
141	/*
142	 * Restart the printer daemon if it was killed
143	 */
144	if (assassinated && !startdaemon(pp))
145		fatal(pp, "cannot restart printer daemon\n");
146	exit(0);
147}
148
149/*
150 * Process a lock file: collect the pid of the active
151 *  daemon and the file name of the active spool entry.
152 * Return boolean indicating existence of a lock file.
153 */
154int
155lockchk(struct printer *pp, char *slockf)
156{
157	register FILE *fp;
158	register int i, n;
159
160	PRIV_START
161	if ((fp = fopen(slockf, "r")) == NULL) {
162		if (errno == EACCES)
163			fatal(pp, "%s: %s", slockf, strerror(errno));
164		else
165			return(0);
166	}
167	PRIV_END
168	if (!get_line(fp)) {
169		(void) fclose(fp);
170		return(0);		/* no daemon present */
171	}
172	cur_daemon = atoi(line);
173	if (kill(cur_daemon, 0) < 0 && errno != EPERM) {
174		(void) fclose(fp);
175		return(0);		/* no daemon present */
176	}
177	for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) {
178		if (i > 5) {
179			n = 1;
180			break;
181		}
182		sleep(i);
183	}
184	current[n-1] = '\0';
185	(void) fclose(fp);
186	return(1);
187}
188
189/*
190 * Process a control file.
191 */
192void
193process(const struct printer *pp, char *file)
194{
195	FILE *cfp;
196
197	if (!chk(file))
198		return;
199	PRIV_START
200	if ((cfp = fopen(file, "r")) == NULL)
201		fatal(pp, "cannot open %s", file);
202	PRIV_END
203	while (get_line(cfp)) {
204		switch (line[0]) {
205		case 'U':  /* unlink associated files */
206			if (strchr(line+1, '/') || strncmp(line+1, "df", 2))
207				break;
208			do_unlink(line+1);
209		}
210	}
211	(void) fclose(cfp);
212	do_unlink(file);
213}
214
215static void
216do_unlink(char *file)
217{
218	int	ret;
219
220	if (from_host != local_host)
221		printf("%s: ", local_host);
222	PRIV_START
223	ret = unlink(file);
224	PRIV_END
225	printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file);
226}
227
228/*
229 * Do the dirty work in checking
230 */
231int
232chk(char *file)
233{
234	int *r, jnum;
235	char **u;
236	const char *cfhost;
237	FILE *cfp;
238
239	/*
240	 * Check for valid cf file name (mostly checking current).
241	 */
242	if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f')
243		return(0);
244
245	jnum = calc_jobnum(file, &cfhost);
246	if (all && (from_host == local_host || !strcmp(from_host, cfhost)))
247		return(1);
248
249	/*
250	 * get the owner's name from the control file.
251	 */
252	PRIV_START
253	if ((cfp = fopen(file, "r")) == NULL)
254		return(0);
255	PRIV_END
256	while (get_line(cfp)) {
257		if (line[0] == 'P')
258			break;
259	}
260	(void) fclose(cfp);
261	if (line[0] != 'P')
262		return(0);
263
264	if (users == 0 && requests == 0)
265		return(!strcmp(file, current) && isowner(line+1, file, cfhost));
266	/*
267	 * Check the request list
268	 */
269	for (r = requ; r < &requ[requests]; r++)
270		if (*r == jnum && isowner(line+1, file, cfhost))
271			return(1);
272	/*
273	 * Check to see if it's in the user list
274	 */
275	for (u = user; u < &user[users]; u++)
276		if (!strcmp(*u, line+1) && isowner(line+1, file, cfhost))
277			return(1);
278	return(0);
279}
280
281/*
282 * If root is removing a file on the local machine, allow it.
283 * If root is removing a file from a remote machine, only allow
284 * files sent from the remote machine to be removed.
285 * Normal users can only remove the file from where it was sent.
286 */
287static int
288isowner(char *owner, char *file, const char *cfhost)
289{
290	if (!strcmp(person, root) && (from_host == local_host ||
291	    !strcmp(from_host, cfhost)))
292		return (1);
293	if (!strcmp(person, owner) && !strcmp(from_host, cfhost))
294		return (1);
295	if (from_host != local_host)
296		printf("%s: ", local_host);
297	printf("%s: Permission denied\n", file);
298	return(0);
299}
300
301/*
302 * Check to see if we are sending files to a remote machine. If we are,
303 * then try removing files on the remote machine.
304 */
305void
306rmremote(const struct printer *pp)
307{
308	int i, elem, firstreq, niov, rem, totlen;
309	char buf[BUFSIZ];
310	void (*savealrm)(int);
311	struct iovec *iov;
312
313	if (!pp->remote)
314		return;	/* not sending to a remote machine */
315
316	/*
317	 * Flush stdout so the user can see what has been deleted
318	 * while we wait (possibly) for the connection.
319	 */
320	fflush(stdout);
321
322	/*
323	 * Counting:
324	 *	4 == "\5" + remote_queue + " " + person
325	 *	2 * users == " " + user[i] for each user
326	 *	requests == asprintf results for each request
327	 *	1 == "\n"
328	 * Although laborious, doing it this way makes it possible for
329	 * us to process requests of indeterminate length without
330	 * applying an arbitrary limit.  Arbitrary Limits Are Bad (tm).
331	 */
332	if (users > 0)
333		niov = 4 + 2 * users + requests + 1;
334	else
335		niov = 4 + requests + 1;
336	iov = malloc(niov * sizeof *iov);
337	if (iov == NULL)
338		fatal(pp, "out of memory in rmremote()");
339	iov[0].iov_base = "\5";
340	iov[1].iov_base = pp->remote_queue;
341	iov[2].iov_base = " ";
342	iov[3].iov_base = all ? "-all" : person;
343	elem = 4;
344	for (i = 0; i < users; i++) {
345		iov[elem].iov_base = " ";
346		iov[elem + 1].iov_base = user[i];
347		elem += 2;
348	}
349	firstreq = elem;
350	for (i = 0; i < requests; i++) {
351		asprintf((char **)&iov[elem].iov_base, " %d", requ[i]);
352		if (iov[elem].iov_base == 0)
353			fatal(pp, "out of memory in rmremote()");
354		elem++;
355	}
356	iov[elem++].iov_base = "\n";
357	for (totlen = i = 0; i < niov; i++)
358		totlen += (iov[i].iov_len = strlen(iov[i].iov_base));
359
360	savealrm = signal(SIGALRM, alarmhandler);
361	alarm(pp->conn_timeout);
362	rem = getport(pp, pp->remote_host, 0);
363	(void)signal(SIGALRM, savealrm);
364	if (rem < 0) {
365		if (from_host != local_host)
366			printf("%s: ", local_host);
367		printf("connection to %s is down\n", pp->remote_host);
368	} else {
369		if (writev(rem, iov, niov) != totlen)
370			fatal(pp, "Lost connection");
371		while ((i = read(rem, buf, sizeof(buf))) > 0)
372			(void) fwrite(buf, 1, i, stdout);
373		(void) close(rem);
374	}
375	for (i = 0; i < requests; i++)
376		free(iov[firstreq + i].iov_base);
377	free(iov);
378}
379
380/*
381 * Return 1 if the filename begins with 'cf'
382 */
383int
384iscf(const struct dirent *d)
385{
386	return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
387}
388
389void
390alarmhandler(int signo __unused)
391{
392	/* the signal is ignored */
393	/* (the '__unused' is just to avoid a compile-time warning) */
394}
395