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 32 static 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("$FreeBSD$"); 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 */ 67 static char root[] = "root"; 68 static int all = 0; /* eliminate all files (root only) */ 69 static int cur_daemon; /* daemon's pid */ 70 static char current[7+MAXHOSTNAMELEN]; /* active control file name */ 71 72 static void alarmhandler(int _signo); 73 static void do_unlink(char *_file); 74 static int isowner(char *_owner, char *_file, const char *_cfhost); 75 76 void 77 rmjob(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 */ 152 int 153 lockchk(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 */ 190 void 191 process(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 } 212 213 static void 214 do_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 */ 229 int 230 chk(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 */ 285 static int 286 isowner(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 */ 303 void 304 rmremote(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 */ 381 int 382 iscf(const struct dirent *d) 383 { 384 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 385 } 386 387 void 388 alarmhandler(int signo __unused) 389 { 390 /* the signal is ignored */ 391 /* (the '__unused' is just to avoid a compile-time warning) */ 392 } 393