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 #include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */
33 #include <sys/param.h>
34 #include <sys/uio.h>
35
36 #include <ctype.h>
37 #include <dirent.h>
38 #include <err.h>
39 #include <errno.h>
40 #include <signal.h>
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #define psignal foil_gcc_psignal
45 #define sys_siglist foil_gcc_siglist
46 #include <unistd.h>
47 #undef psignal
48 #undef sys_siglist
49
50 #include "lp.h"
51 #include "lp.local.h"
52 #include "pathnames.h"
53
54 /*
55 * rmjob - remove the specified jobs from the queue.
56 */
57
58 /*
59 * Stuff for handling lprm specifications
60 */
61 static char root[] = "root";
62 static int all = 0; /* eliminate all files (root only) */
63 static int cur_daemon; /* daemon's pid */
64 static char current[7+MAXHOSTNAMELEN]; /* active control file name */
65
66 static void alarmhandler(int _signo);
67 static void do_unlink(char *_file);
68 static int isowner(char *_owner, char *_file, const char *_cfhost);
69
70 void
rmjob(const char * printer)71 rmjob(const char *printer)
72 {
73 register int i, nitems;
74 int assassinated = 0;
75 struct dirent **files;
76 char *cp;
77 struct printer myprinter, *pp = &myprinter;
78
79 init_printer(pp);
80 if ((i = getprintcap(printer, pp)) < 0)
81 fatal(pp, "getprintcap: %s", pcaperr(i));
82 if ((cp = checkremote(pp))) {
83 printf("Warning: %s\n", cp);
84 free(cp);
85 }
86
87 /*
88 * If the format was `lprm -' and the user isn't the super-user,
89 * then fake things to look like he said `lprm user'.
90 */
91 if (users < 0) {
92 if (getuid() == 0)
93 all = 1; /* all files in local queue */
94 else {
95 user[0] = person;
96 users = 1;
97 }
98 }
99 if (!strcmp(person, "-all")) {
100 if (from_host == local_host)
101 fatal(pp, "The login name \"-all\" is reserved");
102 all = 1; /* all those from 'from_host' */
103 person = root;
104 }
105
106 PRIV_START
107 if (chdir(pp->spool_dir) < 0)
108 fatal(pp, "cannot chdir to spool directory");
109 if ((nitems = scandir(".", &files, iscf, NULL)) < 0)
110 fatal(pp, "cannot access spool directory");
111 PRIV_END
112
113 if (nitems) {
114 /*
115 * Check for an active printer daemon (in which case we
116 * kill it if it is reading our file) then remove stuff
117 * (after which we have to restart the daemon).
118 */
119 if (lockchk(pp, pp->lock_file) && chk(current)) {
120 PRIV_START
121 assassinated = kill(cur_daemon, SIGINT) == 0;
122 PRIV_END
123 if (!assassinated)
124 fatal(pp, "cannot kill printer daemon");
125 }
126 /*
127 * process the files
128 */
129 for (i = 0; i < nitems; i++)
130 process(pp, files[i]->d_name);
131 }
132 rmremote(pp);
133 /*
134 * Restart the printer daemon if it was killed
135 */
136 if (assassinated && !startdaemon(pp))
137 fatal(pp, "cannot restart printer daemon\n");
138 exit(0);
139 }
140
141 /*
142 * Process a lock file: collect the pid of the active
143 * daemon and the file name of the active spool entry.
144 * Return boolean indicating existence of a lock file.
145 */
146 int
lockchk(struct printer * pp,char * slockf)147 lockchk(struct printer *pp, char *slockf)
148 {
149 register FILE *fp;
150 register int i, n;
151
152 PRIV_START
153 if ((fp = fopen(slockf, "r")) == NULL) {
154 if (errno == EACCES)
155 fatal(pp, "%s: %s", slockf, strerror(errno));
156 else
157 return(0);
158 }
159 PRIV_END
160 if (!get_line(fp)) {
161 (void) fclose(fp);
162 return(0); /* no daemon present */
163 }
164 cur_daemon = atoi(line);
165 if (kill(cur_daemon, 0) < 0 && errno != EPERM) {
166 (void) fclose(fp);
167 return(0); /* no daemon present */
168 }
169 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) {
170 if (i > 5) {
171 n = 1;
172 break;
173 }
174 sleep(i);
175 }
176 current[n-1] = '\0';
177 (void) fclose(fp);
178 return(1);
179 }
180
181 /*
182 * Process a control file.
183 */
184 void
process(const struct printer * pp,char * file)185 process(const struct printer *pp, char *file)
186 {
187 FILE *cfp;
188
189 if (!chk(file))
190 return;
191 PRIV_START
192 if ((cfp = fopen(file, "r")) == NULL)
193 fatal(pp, "cannot open %s", file);
194 PRIV_END
195 while (get_line(cfp)) {
196 switch (line[0]) {
197 case 'U': /* unlink associated files */
198 if (strchr(line+1, '/') || strncmp(line+1, "df", 2))
199 break;
200 do_unlink(line+1);
201 }
202 }
203 (void) fclose(cfp);
204 do_unlink(file);
205 }
206
207 static void
do_unlink(char * file)208 do_unlink(char *file)
209 {
210 int ret;
211
212 if (from_host != local_host)
213 printf("%s: ", local_host);
214 PRIV_START
215 ret = unlink(file);
216 PRIV_END
217 printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file);
218 }
219
220 /*
221 * Do the dirty work in checking
222 */
223 int
chk(char * file)224 chk(char *file)
225 {
226 int *r, jnum;
227 char **u;
228 const char *cfhost;
229 FILE *cfp;
230
231 /*
232 * Check for valid cf file name (mostly checking current).
233 */
234 if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f')
235 return(0);
236
237 jnum = calc_jobnum(file, &cfhost);
238 if (all && (from_host == local_host || !strcmp(from_host, cfhost)))
239 return(1);
240
241 /*
242 * get the owner's name from the control file.
243 */
244 PRIV_START
245 if ((cfp = fopen(file, "r")) == NULL)
246 return(0);
247 PRIV_END
248 while (get_line(cfp)) {
249 if (line[0] == 'P')
250 break;
251 }
252 (void) fclose(cfp);
253 if (line[0] != 'P')
254 return(0);
255
256 if (users == 0 && requests == 0)
257 return(!strcmp(file, current) && isowner(line+1, file, cfhost));
258 /*
259 * Check the request list
260 */
261 for (r = requ; r < &requ[requests]; r++)
262 if (*r == jnum && isowner(line+1, file, cfhost))
263 return(1);
264 /*
265 * Check to see if it's in the user list
266 */
267 for (u = user; u < &user[users]; u++)
268 if (!strcmp(*u, line+1) && isowner(line+1, file, cfhost))
269 return(1);
270 return(0);
271 }
272
273 /*
274 * If root is removing a file on the local machine, allow it.
275 * If root is removing a file from a remote machine, only allow
276 * files sent from the remote machine to be removed.
277 * Normal users can only remove the file from where it was sent.
278 */
279 static int
isowner(char * owner,char * file,const char * cfhost)280 isowner(char *owner, char *file, const char *cfhost)
281 {
282 if (!strcmp(person, root) && (from_host == local_host ||
283 !strcmp(from_host, cfhost)))
284 return (1);
285 if (!strcmp(person, owner) && !strcmp(from_host, cfhost))
286 return (1);
287 if (from_host != local_host)
288 printf("%s: ", local_host);
289 printf("%s: Permission denied\n", file);
290 return(0);
291 }
292
293 /*
294 * Check to see if we are sending files to a remote machine. If we are,
295 * then try removing files on the remote machine.
296 */
297 void
rmremote(const struct printer * pp)298 rmremote(const struct printer *pp)
299 {
300 int i, elem, firstreq, niov, rem, totlen;
301 char buf[BUFSIZ];
302 void (*savealrm)(int);
303 struct iovec *iov;
304
305 if (!pp->remote)
306 return; /* not sending to a remote machine */
307
308 /*
309 * Flush stdout so the user can see what has been deleted
310 * while we wait (possibly) for the connection.
311 */
312 fflush(stdout);
313
314 /*
315 * Counting:
316 * 4 == "\5" + remote_queue + " " + person
317 * 2 * users == " " + user[i] for each user
318 * requests == asprintf results for each request
319 * 1 == "\n"
320 * Although laborious, doing it this way makes it possible for
321 * us to process requests of indeterminate length without
322 * applying an arbitrary limit. Arbitrary Limits Are Bad (tm).
323 */
324 if (users > 0)
325 niov = 4 + 2 * users + requests + 1;
326 else
327 niov = 4 + requests + 1;
328 iov = malloc(niov * sizeof *iov);
329 if (iov == NULL)
330 fatal(pp, "out of memory in rmremote()");
331 iov[0].iov_base = "\5";
332 iov[1].iov_base = pp->remote_queue;
333 iov[2].iov_base = " ";
334 iov[3].iov_base = all ? "-all" : person;
335 elem = 4;
336 for (i = 0; i < users; i++) {
337 iov[elem].iov_base = " ";
338 iov[elem + 1].iov_base = user[i];
339 elem += 2;
340 }
341 firstreq = elem;
342 for (i = 0; i < requests; i++) {
343 asprintf((char **)&iov[elem].iov_base, " %d", requ[i]);
344 if (iov[elem].iov_base == 0)
345 fatal(pp, "out of memory in rmremote()");
346 elem++;
347 }
348 iov[elem++].iov_base = "\n";
349 for (totlen = i = 0; i < niov; i++)
350 totlen += (iov[i].iov_len = strlen(iov[i].iov_base));
351
352 savealrm = signal(SIGALRM, alarmhandler);
353 alarm(pp->conn_timeout);
354 rem = getport(pp, pp->remote_host, 0);
355 (void)signal(SIGALRM, savealrm);
356 if (rem < 0) {
357 if (from_host != local_host)
358 printf("%s: ", local_host);
359 printf("connection to %s is down\n", pp->remote_host);
360 } else {
361 if (writev(rem, iov, niov) != totlen)
362 fatal(pp, "Lost connection");
363 while ((i = read(rem, buf, sizeof(buf))) > 0)
364 (void) fwrite(buf, 1, i, stdout);
365 (void) close(rem);
366 }
367 for (i = 0; i < requests; i++)
368 free(iov[firstreq + i].iov_base);
369 free(iov);
370 }
371
372 /*
373 * Return 1 if the filename begins with 'cf'
374 */
375 int
iscf(const struct dirent * d)376 iscf(const struct dirent *d)
377 {
378 return(d->d_name[0] == 'c' && d->d_name[1] == 'f');
379 }
380
381 void
alarmhandler(int signo __unused)382 alarmhandler(int signo __unused)
383 {
384 /* the signal is ignored */
385 /* (the '__unused' is just to avoid a compile-time warning) */
386 }
387