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 34 static 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 */ 69 static char root[] = "root"; 70 static int all = 0; /* eliminate all files (root only) */ 71 static int cur_daemon; /* daemon's pid */ 72 static char current[7+MAXHOSTNAMELEN]; /* active control file name */ 73 74 static void alarmhandler(int _signo); 75 static void do_unlink(char *_file); 76 static int isowner(char *_owner, char *_file, const char *_cfhost); 77 78 void 79 rmjob(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 */ 154 int 155 lockchk(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 */ 192 void 193 process(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 } 214 215 static void 216 do_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 */ 231 int 232 chk(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 */ 287 static int 288 isowner(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 */ 305 void 306 rmremote(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 */ 383 int 384 iscf(const struct dirent *d) 385 { 386 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 387 } 388 389 void 390 alarmhandler(int signo __unused) 391 { 392 /* the signal is ignored */ 393 /* (the '__unused' is just to avoid a compile-time warning) */ 394 } 395