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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if 0 35 #ifndef lint 36 static char sccsid[] = "@(#)rmjob.c 8.2 (Berkeley) 4/28/95"; 37 #endif /* not lint */ 38 #endif 39 40 #include "lp.cdefs.h" /* A cross-platform version of <sys/cdefs.h> */ 41 __FBSDID("$FreeBSD$"); 42 43 #include <sys/param.h> 44 #include <sys/uio.h> 45 46 #include <ctype.h> 47 #include <dirent.h> 48 #include <errno.h> 49 #include <signal.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #define psignal foil_gcc_psignal 54 #define sys_siglist foil_gcc_siglist 55 #include <unistd.h> 56 #undef psignal 57 #undef sys_siglist 58 59 #include "lp.h" 60 #include "lp.local.h" 61 #include "pathnames.h" 62 63 /* 64 * rmjob - remove the specified jobs from the queue. 65 */ 66 67 /* 68 * Stuff for handling lprm specifications 69 */ 70 static char root[] = "root"; 71 static int all = 0; /* eliminate all files (root only) */ 72 static int cur_daemon; /* daemon's pid */ 73 static char current[7+MAXHOSTNAMELEN]; /* active control file name */ 74 75 extern uid_t uid, euid; /* real and effective user id's */ 76 77 static void alarmhandler(int _signo); 78 static void do_unlink(char *_file); 79 static int isowner(char *_owner, char *_file, const char *_cfhost); 80 81 void 82 rmjob(const char *printer) 83 { 84 register int i, nitems; 85 int assasinated = 0; 86 struct dirent **files; 87 char *cp; 88 struct printer myprinter, *pp = &myprinter; 89 90 init_printer(pp); 91 if ((i = getprintcap(printer, pp)) < 0) 92 fatal(pp, "getprintcap: %s", pcaperr(i)); 93 if ((cp = checkremote(pp))) { 94 printf("Warning: %s\n", cp); 95 free(cp); 96 } 97 98 /* 99 * If the format was `lprm -' and the user isn't the super-user, 100 * then fake things to look like he said `lprm user'. 101 */ 102 if (users < 0) { 103 if (getuid() == 0) 104 all = 1; /* all files in local queue */ 105 else { 106 user[0] = person; 107 users = 1; 108 } 109 } 110 if (!strcmp(person, "-all")) { 111 if (from_host == local_host) 112 fatal(pp, "The login name \"-all\" is reserved"); 113 all = 1; /* all those from 'from_host' */ 114 person = root; 115 } 116 117 seteuid(euid); 118 if (chdir(pp->spool_dir) < 0) 119 fatal(pp, "cannot chdir to spool directory"); 120 if ((nitems = scandir(".", &files, iscf, NULL)) < 0) 121 fatal(pp, "cannot access spool directory"); 122 seteuid(uid); 123 124 if (nitems) { 125 /* 126 * Check for an active printer daemon (in which case we 127 * kill it if it is reading our file) then remove stuff 128 * (after which we have to restart the daemon). 129 */ 130 if (lockchk(pp, pp->lock_file) && chk(current)) { 131 seteuid(euid); 132 assasinated = kill(cur_daemon, SIGINT) == 0; 133 seteuid(uid); 134 if (!assasinated) 135 fatal(pp, "cannot kill printer daemon"); 136 } 137 /* 138 * process the files 139 */ 140 for (i = 0; i < nitems; i++) 141 process(pp, files[i]->d_name); 142 } 143 rmremote(pp); 144 /* 145 * Restart the printer daemon if it was killed 146 */ 147 if (assasinated && !startdaemon(pp)) 148 fatal(pp, "cannot restart printer daemon\n"); 149 exit(0); 150 } 151 152 /* 153 * Process a lock file: collect the pid of the active 154 * daemon and the file name of the active spool entry. 155 * Return boolean indicating existence of a lock file. 156 */ 157 int 158 lockchk(struct printer *pp, char *slockf) 159 { 160 register FILE *fp; 161 register int i, n; 162 163 seteuid(euid); 164 if ((fp = fopen(slockf, "r")) == NULL) { 165 if (errno == EACCES) 166 fatal(pp, "%s: %s", slockf, strerror(errno)); 167 else 168 return(0); 169 } 170 seteuid(uid); 171 if (!getline(fp)) { 172 (void) fclose(fp); 173 return(0); /* no daemon present */ 174 } 175 cur_daemon = atoi(line); 176 if (kill(cur_daemon, 0) < 0 && errno != EPERM) { 177 (void) fclose(fp); 178 return(0); /* no daemon present */ 179 } 180 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) { 181 if (i > 5) { 182 n = 1; 183 break; 184 } 185 sleep(i); 186 } 187 current[n-1] = '\0'; 188 (void) fclose(fp); 189 return(1); 190 } 191 192 /* 193 * Process a control file. 194 */ 195 void 196 process(const struct printer *pp, char *file) 197 { 198 FILE *cfp; 199 200 if (!chk(file)) 201 return; 202 seteuid(euid); 203 if ((cfp = fopen(file, "r")) == NULL) 204 fatal(pp, "cannot open %s", file); 205 seteuid(uid); 206 while (getline(cfp)) { 207 switch (line[0]) { 208 case 'U': /* unlink associated files */ 209 if (strchr(line+1, '/') || strncmp(line+1, "df", 2)) 210 break; 211 do_unlink(line+1); 212 } 213 } 214 (void) fclose(cfp); 215 do_unlink(file); 216 } 217 218 static void 219 do_unlink(char *file) 220 { 221 int ret; 222 223 if (from_host != local_host) 224 printf("%s: ", local_host); 225 seteuid(euid); 226 ret = unlink(file); 227 seteuid(uid); 228 printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file); 229 } 230 231 /* 232 * Do the dirty work in checking 233 */ 234 int 235 chk(char *file) 236 { 237 int *r, jnum; 238 char **u; 239 const char *cfhost; 240 FILE *cfp; 241 242 /* 243 * Check for valid cf file name (mostly checking current). 244 */ 245 if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f') 246 return(0); 247 248 jnum = calc_jobnum(file, &cfhost); 249 if (all && (from_host == local_host || !strcmp(from_host, cfhost))) 250 return(1); 251 252 /* 253 * get the owner's name from the control file. 254 */ 255 seteuid(euid); 256 if ((cfp = fopen(file, "r")) == NULL) 257 return(0); 258 seteuid(uid); 259 while (getline(cfp)) { 260 if (line[0] == 'P') 261 break; 262 } 263 (void) fclose(cfp); 264 if (line[0] != 'P') 265 return(0); 266 267 if (users == 0 && requests == 0) 268 return(!strcmp(file, current) && isowner(line+1, file, cfhost)); 269 /* 270 * Check the request list 271 */ 272 for (r = requ; r < &requ[requests]; r++) 273 if (*r == jnum && isowner(line+1, file, cfhost)) 274 return(1); 275 /* 276 * Check to see if it's in the user list 277 */ 278 for (u = user; u < &user[users]; u++) 279 if (!strcmp(*u, line+1) && isowner(line+1, file, cfhost)) 280 return(1); 281 return(0); 282 } 283 284 /* 285 * If root is removing a file on the local machine, allow it. 286 * If root is removing a file from a remote machine, only allow 287 * files sent from the remote machine to be removed. 288 * Normal users can only remove the file from where it was sent. 289 */ 290 static int 291 isowner(char *owner, char *file, const char *cfhost) 292 { 293 if (!strcmp(person, root) && (from_host == local_host || 294 !strcmp(from_host, cfhost))) 295 return (1); 296 if (!strcmp(person, owner) && !strcmp(from_host, cfhost)) 297 return (1); 298 if (from_host != local_host) 299 printf("%s: ", local_host); 300 printf("%s: Permission denied\n", file); 301 return(0); 302 } 303 304 /* 305 * Check to see if we are sending files to a remote machine. If we are, 306 * then try removing files on the remote machine. 307 */ 308 void 309 rmremote(const struct printer *pp) 310 { 311 int i, elem, firstreq, niov, rem, totlen; 312 char buf[BUFSIZ]; 313 void (*savealrm)(int); 314 struct iovec *iov; 315 316 if (!pp->remote) 317 return; /* not sending to a remote machine */ 318 319 /* 320 * Flush stdout so the user can see what has been deleted 321 * while we wait (possibly) for the connection. 322 */ 323 fflush(stdout); 324 325 /* 326 * Counting: 327 * 4 == "\5" + remote_queue + " " + person 328 * 2 * users == " " + user[i] for each user 329 * requests == asprintf results for each request 330 * 1 == "\n" 331 * Although laborious, doing it this way makes it possible for 332 * us to process requests of indeterminate length without 333 * applying an arbitrary limit. Arbitrary Limits Are Bad (tm). 334 */ 335 if (users > 0) 336 niov = 4 + 2 * users + requests + 1; 337 else 338 niov = 4 + requests + 1; 339 iov = malloc(niov * sizeof *iov); 340 if (iov == 0) 341 fatal(pp, "out of memory in rmremote()"); 342 iov[0].iov_base = "\5"; 343 iov[1].iov_base = pp->remote_queue; 344 iov[2].iov_base = " "; 345 iov[3].iov_base = all ? "-all" : person; 346 elem = 4; 347 for (i = 0; i < users; i++) { 348 iov[elem].iov_base = " "; 349 iov[elem + 1].iov_base = user[i]; 350 elem += 2; 351 } 352 firstreq = elem; 353 for (i = 0; i < requests; i++) { 354 asprintf((char **)&iov[elem].iov_base, " %d", requ[i]); 355 if (iov[elem].iov_base == 0) 356 fatal(pp, "out of memory in rmremote()"); 357 elem++; 358 } 359 iov[elem++].iov_base = "\n"; 360 for (totlen = i = 0; i < niov; i++) 361 totlen += (iov[i].iov_len = strlen(iov[i].iov_base)); 362 363 savealrm = signal(SIGALRM, alarmhandler); 364 alarm(pp->conn_timeout); 365 rem = getport(pp, pp->remote_host, 0); 366 (void)signal(SIGALRM, savealrm); 367 if (rem < 0) { 368 if (from_host != local_host) 369 printf("%s: ", local_host); 370 printf("connection to %s is down\n", pp->remote_host); 371 } else { 372 if (writev(rem, iov, niov) != totlen) 373 fatal(pp, "Lost connection"); 374 while ((i = read(rem, buf, sizeof(buf))) > 0) 375 (void) fwrite(buf, 1, i, stdout); 376 (void) close(rem); 377 } 378 for (i = 0; i < requests; i++) 379 free(iov[firstreq + i].iov_base); 380 free(iov); 381 } 382 383 /* 384 * Return 1 if the filename begins with 'cf' 385 */ 386 int 387 iscf(const struct dirent *d) 388 { 389 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 390 } 391 392 void 393 alarmhandler(int signo __unused) 394 { 395 /* the signal is ignored */ 396 /* (the '__unused' is just to avoid a compile-time warning) */ 397 } 398