1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if 0
31#ifndef lint
32static char sccsid[] = "@(#)rmjob.c	8.2 (Berkeley) 4/28/95";
33#endif /* not lint */
34#endif
35
36#include "lp.cdefs.h"		/* A cross-platform version of <sys/cdefs.h> */
37__FBSDID("$FreeBSD: releng/10.3/usr.sbin/lpr/common_source/rmjob.c 242091 2012-10-25 20:16:38Z ed $");
38
39#include <sys/param.h>
40#include <sys/uio.h>
41
42#include <ctype.h>
43#include <dirent.h>
44#include <err.h>
45#include <errno.h>
46#include <signal.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#define psignal foil_gcc_psignal
51#define	sys_siglist foil_gcc_siglist
52#include <unistd.h>
53#undef psignal
54#undef sys_siglist
55
56#include "lp.h"
57#include "lp.local.h"
58#include "pathnames.h"
59
60/*
61 * rmjob - remove the specified jobs from the queue.
62 */
63
64/*
65 * Stuff for handling lprm specifications
66 */
67static char	root[] = "root";
68static int	all = 0;		/* eliminate all files (root only) */
69static int	cur_daemon;		/* daemon's pid */
70static char	current[7+MAXHOSTNAMELEN];  /* active control file name */
71
72static	void	alarmhandler(int _signo);
73static	void	do_unlink(char *_file);
74static int	 isowner(char *_owner, char *_file, const char *_cfhost);
75
76void
77rmjob(const char *printer)
78{
79	register int i, nitems;
80	int assassinated = 0;
81	struct dirent **files;
82	char *cp;
83	struct printer myprinter, *pp = &myprinter;
84
85	init_printer(pp);
86	if ((i = getprintcap(printer, pp)) < 0)
87		fatal(pp, "getprintcap: %s", pcaperr(i));
88	if ((cp = checkremote(pp))) {
89		printf("Warning: %s\n", cp);
90		free(cp);
91	}
92
93	/*
94	 * If the format was `lprm -' and the user isn't the super-user,
95	 *  then fake things to look like he said `lprm user'.
96	 */
97	if (users < 0) {
98		if (getuid() == 0)
99			all = 1;	/* all files in local queue */
100		else {
101			user[0] = person;
102			users = 1;
103		}
104	}
105	if (!strcmp(person, "-all")) {
106		if (from_host == local_host)
107			fatal(pp, "The login name \"-all\" is reserved");
108		all = 1;	/* all those from 'from_host' */
109		person = root;
110	}
111
112	PRIV_START
113	if (chdir(pp->spool_dir) < 0)
114		fatal(pp, "cannot chdir to spool directory");
115	if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
116		fatal(pp, "cannot access spool directory");
117	PRIV_END
118
119	if (nitems) {
120		/*
121		 * Check for an active printer daemon (in which case we
122		 *  kill it if it is reading our file) then remove stuff
123		 *  (after which we have to restart the daemon).
124		 */
125		if (lockchk(pp, pp->lock_file) && chk(current)) {
126			PRIV_START
127			assassinated = kill(cur_daemon, SIGINT) == 0;
128			PRIV_END
129			if (!assassinated)
130				fatal(pp, "cannot kill printer daemon");
131		}
132		/*
133		 * process the files
134		 */
135		for (i = 0; i < nitems; i++)
136			process(pp, files[i]->d_name);
137	}
138	rmremote(pp);
139	/*
140	 * Restart the printer daemon if it was killed
141	 */
142	if (assassinated && !startdaemon(pp))
143		fatal(pp, "cannot restart printer daemon\n");
144	exit(0);
145}
146
147/*
148 * Process a lock file: collect the pid of the active
149 *  daemon and the file name of the active spool entry.
150 * Return boolean indicating existence of a lock file.
151 */
152int
153lockchk(struct printer *pp, char *slockf)
154{
155	register FILE *fp;
156	register int i, n;
157
158	PRIV_START
159	if ((fp = fopen(slockf, "r")) == NULL) {
160		if (errno == EACCES)
161			fatal(pp, "%s: %s", slockf, strerror(errno));
162		else
163			return(0);
164	}
165	PRIV_END
166	if (!getline(fp)) {
167		(void) fclose(fp);
168		return(0);		/* no daemon present */
169	}
170	cur_daemon = atoi(line);
171	if (kill(cur_daemon, 0) < 0 && errno != EPERM) {
172		(void) fclose(fp);
173		return(0);		/* no daemon present */
174	}
175	for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) {
176		if (i > 5) {
177			n = 1;
178			break;
179		}
180		sleep(i);
181	}
182	current[n-1] = '\0';
183	(void) fclose(fp);
184	return(1);
185}
186
187/*
188 * Process a control file.
189 */
190void
191process(const struct printer *pp, char *file)
192{
193	FILE *cfp;
194
195	if (!chk(file))
196		return;
197	PRIV_START
198	if ((cfp = fopen(file, "r")) == NULL)
199		fatal(pp, "cannot open %s", file);
200	PRIV_END
201	while (getline(cfp)) {
202		switch (line[0]) {
203		case 'U':  /* unlink associated files */
204			if (strchr(line+1, '/') || strncmp(line+1, "df", 2))
205				break;
206			do_unlink(line+1);
207		}
208	}
209	(void) fclose(cfp);
210	do_unlink(file);
211}
212
213static void
214do_unlink(char *file)
215{
216	int	ret;
217
218	if (from_host != local_host)
219		printf("%s: ", local_host);
220	PRIV_START
221	ret = unlink(file);
222	PRIV_END
223	printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file);
224}
225
226/*
227 * Do the dirty work in checking
228 */
229int
230chk(char *file)
231{
232	int *r, jnum;
233	char **u;
234	const char *cfhost;
235	FILE *cfp;
236
237	/*
238	 * Check for valid cf file name (mostly checking current).
239	 */
240	if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f')
241		return(0);
242
243	jnum = calc_jobnum(file, &cfhost);
244	if (all && (from_host == local_host || !strcmp(from_host, cfhost)))
245		return(1);
246
247	/*
248	 * get the owner's name from the control file.
249	 */
250	PRIV_START
251	if ((cfp = fopen(file, "r")) == NULL)
252		return(0);
253	PRIV_END
254	while (getline(cfp)) {
255		if (line[0] == 'P')
256			break;
257	}
258	(void) fclose(cfp);
259	if (line[0] != 'P')
260		return(0);
261
262	if (users == 0 && requests == 0)
263		return(!strcmp(file, current) && isowner(line+1, file, cfhost));
264	/*
265	 * Check the request list
266	 */
267	for (r = requ; r < &requ[requests]; r++)
268		if (*r == jnum && isowner(line+1, file, cfhost))
269			return(1);
270	/*
271	 * Check to see if it's in the user list
272	 */
273	for (u = user; u < &user[users]; u++)
274		if (!strcmp(*u, line+1) && isowner(line+1, file, cfhost))
275			return(1);
276	return(0);
277}
278
279/*
280 * If root is removing a file on the local machine, allow it.
281 * If root is removing a file from a remote machine, only allow
282 * files sent from the remote machine to be removed.
283 * Normal users can only remove the file from where it was sent.
284 */
285static int
286isowner(char *owner, char *file, const char *cfhost)
287{
288	if (!strcmp(person, root) && (from_host == local_host ||
289	    !strcmp(from_host, cfhost)))
290		return (1);
291	if (!strcmp(person, owner) && !strcmp(from_host, cfhost))
292		return (1);
293	if (from_host != local_host)
294		printf("%s: ", local_host);
295	printf("%s: Permission denied\n", file);
296	return(0);
297}
298
299/*
300 * Check to see if we are sending files to a remote machine. If we are,
301 * then try removing files on the remote machine.
302 */
303void
304rmremote(const struct printer *pp)
305{
306	int i, elem, firstreq, niov, rem, totlen;
307	char buf[BUFSIZ];
308	void (*savealrm)(int);
309	struct iovec *iov;
310
311	if (!pp->remote)
312		return;	/* not sending to a remote machine */
313
314	/*
315	 * Flush stdout so the user can see what has been deleted
316	 * while we wait (possibly) for the connection.
317	 */
318	fflush(stdout);
319
320	/*
321	 * Counting:
322	 *	4 == "\5" + remote_queue + " " + person
323	 *	2 * users == " " + user[i] for each user
324	 *	requests == asprintf results for each request
325	 *	1 == "\n"
326	 * Although laborious, doing it this way makes it possible for
327	 * us to process requests of indeterminate length without
328	 * applying an arbitrary limit.  Arbitrary Limits Are Bad (tm).
329	 */
330	if (users > 0)
331		niov = 4 + 2 * users + requests + 1;
332	else
333		niov = 4 + requests + 1;
334	iov = malloc(niov * sizeof *iov);
335	if (iov == 0)
336		fatal(pp, "out of memory in rmremote()");
337	iov[0].iov_base = "\5";
338	iov[1].iov_base = pp->remote_queue;
339	iov[2].iov_base = " ";
340	iov[3].iov_base = all ? "-all" : person;
341	elem = 4;
342	for (i = 0; i < users; i++) {
343		iov[elem].iov_base = " ";
344		iov[elem + 1].iov_base = user[i];
345		elem += 2;
346	}
347	firstreq = elem;
348	for (i = 0; i < requests; i++) {
349		asprintf((char **)&iov[elem].iov_base, " %d", requ[i]);
350		if (iov[elem].iov_base == 0)
351			fatal(pp, "out of memory in rmremote()");
352		elem++;
353	}
354	iov[elem++].iov_base = "\n";
355	for (totlen = i = 0; i < niov; i++)
356		totlen += (iov[i].iov_len = strlen(iov[i].iov_base));
357
358	savealrm = signal(SIGALRM, alarmhandler);
359	alarm(pp->conn_timeout);
360	rem = getport(pp, pp->remote_host, 0);
361	(void)signal(SIGALRM, savealrm);
362	if (rem < 0) {
363		if (from_host != local_host)
364			printf("%s: ", local_host);
365		printf("connection to %s is down\n", pp->remote_host);
366	} else {
367		if (writev(rem, iov, niov) != totlen)
368			fatal(pp, "Lost connection");
369		while ((i = read(rem, buf, sizeof(buf))) > 0)
370			(void) fwrite(buf, 1, i, stdout);
371		(void) close(rem);
372	}
373	for (i = 0; i < requests; i++)
374		free(iov[firstreq + i].iov_base);
375	free(iov);
376}
377
378/*
379 * Return 1 if the filename begins with 'cf'
380 */
381int
382iscf(const struct dirent *d)
383{
384	return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
385}
386
387void
388alarmhandler(int signo __unused)
389{
390	/* the signal is ignored */
391	/* (the '__unused' is just to avoid a compile-time warning) */
392}
393