GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/lpr/lpd/../common_source/rmjob.c Lines: 0 167 0.0 %
Date: 2017-11-13 Branches: 0 156 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: rmjob.c,v 1.23 2016/01/12 23:35:13 tb Exp $	*/
2
/*	$NetBSD: rmjob.c,v 1.16 2000/04/16 14:43:58 mrg Exp $	*/
3
4
/*
5
 * Copyright (c) 1983, 1993
6
 *	The Regents of the University of California.  All rights reserved.
7
 *
8
 * Redistribution and use in source and binary forms, with or without
9
 * modification, are permitted provided that the following conditions
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 * are met:
11
 * 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. 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
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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
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
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 * 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 <signal.h>
34
#include <errno.h>
35
#include <fcntl.h>
36
#include <dirent.h>
37
#include <unistd.h>
38
#include <limits.h>
39
#include <stdlib.h>
40
#include <stdio.h>
41
#include <string.h>
42
#include <ctype.h>
43
#include "lp.h"
44
#include "lp.local.h"
45
#include "pathnames.h"
46
47
/*
48
 * rmjob - remove the specified jobs from the queue.
49
 */
50
51
/*
52
 * Stuff for handling lprm specifications
53
 */
54
extern char	*user[];		/* users to process */
55
extern int	users;			/* # of users in user array */
56
extern int	requ[];			/* job number of spool entries */
57
extern int	requests;		/* # of spool requests */
58
extern char	*person;		/* name of person doing lprm */
59
60
static char	root[] = "root";
61
static int	all = 0;		/* eliminate all files (root only) */
62
static int	cur_daemon;		/* daemon's pid */
63
static char	current[NAME_MAX];	/* active control file name */
64
65
static void	alarmer(int);
66
static int	chk(char *);
67
static void	do_unlink(char *);
68
static int	iscf(const struct dirent *);
69
static int	isowner(char *, char *);
70
static int	lockchk(char *);
71
static void	process(char *);
72
static void	rmremote(void);
73
74
void
75
rmjob(void)
76
{
77
	int i, nitems;
78
	int assassinated = 0;
79
	struct dirent **files;
80
	char *cp;
81
82
	if ((i = cgetent(&bp, printcapdb, printer)) == -2)
83
		fatal("can't open printer description file");
84
	else if (i == -1)
85
		fatal("unknown printer");
86
	else if (i == -3)
87
		fatal("potential reference loop detected in printcap file");
88
	if (cgetstr(bp, DEFLP, &LP) < 0)
89
		LP = _PATH_DEFDEVLP;
90
	if (cgetstr(bp, "rp", &RP) < 0)
91
		RP = DEFLP;
92
	if (cgetstr(bp, "sd", &SD) < 0)
93
		SD = _PATH_DEFSPOOL;
94
	if (cgetstr(bp,"lo", &LO) < 0)
95
		LO = DEFLOCK;
96
	cgetstr(bp, "rm", &RM);
97
	if ((cp = checkremote()) != NULL)
98
		printf("Warning: %s\n", cp);
99
100
	/*
101
	 * If the format was `lprm -' and the user isn't the super-user,
102
	 *  then fake things to look like he said `lprm user'.
103
	 */
104
	if (users < 0) {
105
		if (getuid() == 0)
106
			all = 1;	/* all files in local queue */
107
		else {
108
			user[0] = person;
109
			users = 1;
110
		}
111
	}
112
	if (!strcmp(person, "-all")) {
113
		if (from == host)
114
			fatal("The login name \"-all\" is reserved");
115
		all = 1;	/* all those from 'from' */
116
		person = root;
117
	}
118
119
	PRIV_START;
120
	if (chdir(SD) < 0)
121
		fatal("cannot chdir to spool directory");
122
	if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
123
		fatal("cannot access spool directory");
124
	PRIV_END;
125
126
	if (nitems) {
127
		/*
128
		 * Check for an active printer daemon.  If one is running
129
		 * and it is reading our file, kill it, then remove stuff.
130
		 * Lastly, restart the daemon if it is not (or no longer)
131
		 * running.
132
		 */
133
		if (lockchk(LO) && chk(current)) {
134
			PRIV_START;
135
			assassinated = kill(cur_daemon, SIGINT) == 0;
136
			PRIV_END;
137
			if (!assassinated)
138
				fatal("cannot kill printer daemon");
139
		}
140
		/*
141
		 * process the files
142
		 */
143
		for (i = 0; i < nitems; i++)
144
			process(files[i]->d_name);
145
	}
146
	rmremote();
147
	/*
148
	 * Restart the printer daemon if it was killed
149
	 */
150
	if (assassinated && !startdaemon(printer))
151
		fatal("cannot restart printer daemon");
152
	exit(0);
153
}
154
155
/*
156
 * Process a lock file: collect the pid of the active
157
 * daemon and the file name of the active spool entry.
158
 * Return boolean indicating existence of a lock file.
159
 */
160
static int
161
lockchk(char *s)
162
{
163
	FILE *fp = NULL;
164
	int fd, i, n;
165
166
	/* NOTE: lock file is owned by root, not the user. */
167
	PRIV_START;
168
	fd = safe_open(s, O_RDONLY|O_NOFOLLOW, 0);
169
	PRIV_END;
170
	if (fd < 0 || (fp = fdopen(fd, "r")) == NULL) {
171
		if (fd >= 0)
172
			close(fd);
173
		if (errno == EACCES)
174
			fatal("can't access lock file");
175
		else
176
			return(0);
177
	}
178
	if (!get_line(fp)) {
179
		(void)fclose(fp);
180
		return(0);		/* no daemon present */
181
	}
182
	cur_daemon = atoi(line);
183
	if (kill(cur_daemon, 0) < 0 && errno != EPERM) {
184
		(void)fclose(fp);
185
		return(0);		/* no daemon present */
186
	}
187
	for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) {
188
		if (i > 5) {
189
			n = 1;
190
			break;
191
		}
192
		sleep(i);
193
	}
194
	current[n-1] = '\0';
195
	(void)fclose(fp);
196
	return(1);
197
}
198
199
/*
200
 * Process a control file.
201
 */
202
static void
203
process(char *file)
204
{
205
	FILE *cfp = NULL;
206
	int fd;
207
208
	if (!chk(file))
209
		return;
210
	PRIV_START;
211
	fd = safe_open(file, O_RDONLY|O_NOFOLLOW, 0);
212
	PRIV_END;
213
	if (fd < 0 || (cfp = fdopen(fd, "r")) == NULL) {
214
		if (fd >= 0)
215
			close(fd);
216
		fatal("cannot open %s", file);
217
	}
218
	while (get_line(cfp)) {
219
		switch (line[0]) {
220
		case 'U':  /* unlink associated files */
221
			if (strchr(line+1, '/') || strncmp(line+1, "df", 2))
222
				break;
223
			do_unlink(line+1);
224
		}
225
	}
226
	(void)fclose(cfp);
227
	do_unlink(file);
228
}
229
230
static void
231
do_unlink(char *file)
232
{
233
	int	ret;
234
235
	if (from != host)
236
		printf("%s: ", host);
237
	PRIV_START;
238
	ret = unlink(file);
239
	PRIV_END;
240
	printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file);
241
}
242
243
/*
244
 * Do the dirty work in checking
245
 */
246
static int
247
chk(char *file)
248
{
249
	int *r, n, fd;
250
	char **u, *cp;
251
	FILE *cfp = NULL;
252
253
	/*
254
	 * Check for valid cf file name (mostly checking current).
255
	 */
256
	if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f')
257
		return(0);
258
259
	if (all && (from == host || !strcmp(from, file+6)))
260
		return(1);
261
262
	/*
263
	 * get the owner's name from the control file.
264
	 */
265
	PRIV_START;
266
	fd = safe_open(file, O_RDONLY|O_NOFOLLOW, 0);
267
	PRIV_END;
268
	if (fd < 0 || (cfp = fdopen(fd, "r")) == NULL) {
269
		if (fd >= 0)
270
			close(fd);
271
		return(0);
272
	}
273
	while (get_line(cfp)) {
274
		if (line[0] == 'P')
275
			break;
276
	}
277
	(void)fclose(cfp);
278
	if (line[0] != 'P')
279
		return(0);
280
281
	if (users == 0 && requests == 0)
282
		return(!strcmp(file, current) && isowner(line+1, file));
283
	/*
284
	 * Check the request list
285
	 */
286
	for (n = 0, cp = file+3; isdigit((unsigned char)*cp); )
287
		n = n * 10 + (*cp++ - '0');
288
	for (r = requ; r < &requ[requests]; r++)
289
		if (*r == n && isowner(line+1, file))
290
			return(1);
291
	/*
292
	 * Check to see if it's in the user list
293
	 */
294
	for (u = user; u < &user[users]; u++)
295
		if (!strcmp(*u, line+1) && isowner(line+1, file))
296
			return(1);
297
	return(0);
298
}
299
300
/*
301
 * If root is removing a file on the local machine, allow it.
302
 * If root is removing a file from a remote machine, only allow
303
 * files sent from the remote machine to be removed.
304
 * Normal users can only remove the file from where it was sent.
305
 */
306
static int
307
isowner(char *owner, char *file)
308
{
309
	if (!strcmp(person, root) && (from == host || !strcmp(from, file+6)))
310
		return(1);
311
	if (!strcmp(person, owner) && !strcmp(from, file+6))
312
		return(1);
313
	if (from != host)
314
		printf("%s: ", host);
315
	printf("%s: Permission denied\n", file);
316
	return(0);
317
}
318
319
/*
320
 * Check to see if we are sending files to a remote machine. If we are,
321
 * then try removing files on the remote machine.
322
 */
323
static void
324
rmremote(void)
325
{
326
	char *cp;
327
	int i, rem;
328
	size_t n;
329
	char buf[BUFSIZ];
330
331
	if (!remote)
332
		return;	/* not sending to a remote machine */
333
334
	/*
335
	 * Flush stdout so the user can see what has been deleted
336
	 * while we wait (possibly) for the connection.
337
	 */
338
	fflush(stdout);
339
340
	/* the trailing space will be replaced with a newline later */
341
	n = snprintf(buf, sizeof(buf), "\5%s %s ", RP, all ? "-all" : person);
342
	if (n == -1 || n >= sizeof(buf))
343
		goto bad;
344
	cp = buf + n;
345
	for (i = 0; i < users; i++) {
346
		n = strlcpy(cp, user[i], sizeof(buf) - (cp - buf + 1));
347
		if (n >= sizeof(buf) - (cp - buf + 1))
348
			goto bad;
349
		cp += n;
350
		*cp++ = ' ';
351
	}
352
	*cp = '\0';
353
	for (i = 0; i < requests; i++) {
354
		n = snprintf(cp, sizeof(buf) - (cp - buf), "%d ", requ[i]);
355
		if (n == -1 || n >= sizeof(buf) - (cp - buf))
356
			goto bad;
357
		cp += n;
358
	}
359
	cp[-1] = '\n';		/* replace space with newline, leave the NUL */
360
	rem = getport(RM, 0);
361
	if (rem < 0) {
362
		if (from != host)
363
			printf("%s: ", host);
364
		printf("connection to %s is down\n", RM);
365
	} else {
366
		struct sigaction osa, nsa;
367
368
		memset(&nsa, 0, sizeof(nsa));
369
		nsa.sa_handler = alarmer;
370
		sigemptyset(&nsa.sa_mask);
371
		nsa.sa_flags = 0;
372
		(void)sigaction(SIGALRM, &nsa, &osa);
373
		alarm(wait_time);
374
375
		i = strlen(buf);
376
		if (write(rem, buf, i) != i)
377
			fatal("Lost connection");
378
		while ((i = read(rem, buf, sizeof(buf))) > 0)
379
			(void)fwrite(buf, 1, i, stdout);
380
		alarm(0);
381
		(void)sigaction(SIGALRM, &osa, NULL);
382
		(void)close(rem);
383
	}
384
	return;
385
bad:
386
	printf("remote buffer too large\n");
387
	return;
388
}
389
390
static void
391
alarmer(int s)
392
{
393
	/* nothing */
394
}
395
396
/*
397
 * Return 1 if the filename begins with 'cf'
398
 */
399
static int
400
iscf(const struct dirent *d)
401
{
402
	return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
403
}