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 #ifndef lint 35 #if 0 36 static char sccsid[] = "@(#)rmjob.c 8.2 (Berkeley) 4/28/95"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* not lint */ 41 42 #include <sys/param.h> 43 #include <sys/uio.h> 44 45 #include <ctype.h> 46 #include <dirent.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 extern uid_t uid, euid; /* real and effective user id's */ 75 76 static void alarmhandler __P((int)); 77 static void do_unlink __P((char *)); 78 79 void 80 rmjob(printer) 81 const char *printer; 82 { 83 register int i, nitems; 84 int assasinated = 0; 85 struct dirent **files; 86 char *cp; 87 struct printer myprinter, *pp = &myprinter; 88 89 init_printer(pp); 90 if ((i = getprintcap(printer, pp)) < 0) 91 fatal(pp, "getprintcap: %s", pcaperr(i)); 92 if ((cp = checkremote(pp))) { 93 printf("Warning: %s\n", cp); 94 free(cp); 95 } 96 97 /* 98 * If the format was `lprm -' and the user isn't the super-user, 99 * then fake things to look like he said `lprm user'. 100 */ 101 if (users < 0) { 102 if (getuid() == 0) 103 all = 1; /* all files in local queue */ 104 else { 105 user[0] = person; 106 users = 1; 107 } 108 } 109 if (!strcmp(person, "-all")) { 110 if (from == host) 111 fatal(pp, "The login name \"-all\" is reserved"); 112 all = 1; /* all those from 'from' */ 113 person = root; 114 } 115 116 seteuid(euid); 117 if (chdir(pp->spool_dir) < 0) 118 fatal(pp, "cannot chdir to spool directory"); 119 if ((nitems = scandir(".", &files, iscf, NULL)) < 0) 120 fatal(pp, "cannot access spool directory"); 121 seteuid(uid); 122 123 if (nitems) { 124 /* 125 * Check for an active printer daemon (in which case we 126 * kill it if it is reading our file) then remove stuff 127 * (after which we have to restart the daemon). 128 */ 129 if (lockchk(pp, pp->lock_file) && chk(current)) { 130 seteuid(euid); 131 assasinated = kill(cur_daemon, SIGINT) == 0; 132 seteuid(uid); 133 if (!assasinated) 134 fatal(pp, "cannot kill printer daemon"); 135 } 136 /* 137 * process the files 138 */ 139 for (i = 0; i < nitems; i++) 140 process(pp, files[i]->d_name); 141 } 142 rmremote(pp); 143 /* 144 * Restart the printer daemon if it was killed 145 */ 146 if (assasinated && !startdaemon(pp)) 147 fatal(pp, "cannot restart printer daemon\n"); 148 exit(0); 149 } 150 151 /* 152 * Process a lock file: collect the pid of the active 153 * daemon and the file name of the active spool entry. 154 * Return boolean indicating existence of a lock file. 155 */ 156 int 157 lockchk(pp, s) 158 struct printer *pp; 159 char *s; 160 { 161 register FILE *fp; 162 register int i, n; 163 164 seteuid(euid); 165 if ((fp = fopen(s, "r")) == NULL) { 166 if (errno == EACCES) 167 fatal(pp, "%s: %s", s, strerror(errno)); 168 else 169 return(0); 170 } 171 seteuid(uid); 172 if (!getline(fp)) { 173 (void) fclose(fp); 174 return(0); /* no daemon present */ 175 } 176 cur_daemon = atoi(line); 177 if (kill(cur_daemon, 0) < 0 && errno != EPERM) { 178 (void) fclose(fp); 179 return(0); /* no daemon present */ 180 } 181 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) { 182 if (i > 5) { 183 n = 1; 184 break; 185 } 186 sleep(i); 187 } 188 current[n-1] = '\0'; 189 (void) fclose(fp); 190 return(1); 191 } 192 193 /* 194 * Process a control file. 195 */ 196 void 197 process(pp, file) 198 const struct printer *pp; 199 char *file; 200 { 201 FILE *cfp; 202 203 if (!chk(file)) 204 return; 205 seteuid(euid); 206 if ((cfp = fopen(file, "r")) == NULL) 207 fatal(pp, "cannot open %s", file); 208 seteuid(uid); 209 while (getline(cfp)) { 210 switch (line[0]) { 211 case 'U': /* unlink associated files */ 212 if (strchr(line+1, '/') || strncmp(line+1, "df", 2)) 213 break; 214 do_unlink(line+1); 215 } 216 } 217 (void) fclose(cfp); 218 do_unlink(file); 219 } 220 221 static void 222 do_unlink(file) 223 char *file; 224 { 225 int ret; 226 227 if (from != host) 228 printf("%s: ", host); 229 seteuid(euid); 230 ret = unlink(file); 231 seteuid(uid); 232 printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file); 233 } 234 235 /* 236 * Do the dirty work in checking 237 */ 238 int 239 chk(file) 240 char *file; 241 { 242 register int *r, n; 243 register char **u, *cp; 244 FILE *cfp; 245 246 /* 247 * Check for valid cf file name (mostly checking current). 248 */ 249 if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f') 250 return(0); 251 252 if (all && (from == host || !strcmp(from, file+6))) 253 return(1); 254 255 /* 256 * get the owner's name from the control file. 257 */ 258 seteuid(euid); 259 if ((cfp = fopen(file, "r")) == NULL) 260 return(0); 261 seteuid(uid); 262 while (getline(cfp)) { 263 if (line[0] == 'P') 264 break; 265 } 266 (void) fclose(cfp); 267 if (line[0] != 'P') 268 return(0); 269 270 if (users == 0 && requests == 0) 271 return(!strcmp(file, current) && isowner(line+1, file)); 272 /* 273 * Check the request list 274 */ 275 for (n = 0, cp = file+3; isdigit(*cp); ) 276 n = n * 10 + (*cp++ - '0'); 277 for (r = requ; r < &requ[requests]; r++) 278 if (*r == n && isowner(line+1, file)) 279 return(1); 280 /* 281 * Check to see if it's in the user list 282 */ 283 for (u = user; u < &user[users]; u++) 284 if (!strcmp(*u, line+1) && isowner(line+1, file)) 285 return(1); 286 return(0); 287 } 288 289 /* 290 * If root is removing a file on the local machine, allow it. 291 * If root is removing a file from a remote machine, only allow 292 * files sent from the remote machine to be removed. 293 * Normal users can only remove the file from where it was sent. 294 */ 295 int 296 isowner(owner, file) 297 char *owner, *file; 298 { 299 if (!strcmp(person, root) && (from == host || !strcmp(from, file+6))) 300 return(1); 301 if (!strcmp(person, owner) && !strcmp(from, file+6)) 302 return(1); 303 if (from != host) 304 printf("%s: ", host); 305 printf("%s: Permission denied\n", file); 306 return(0); 307 } 308 309 /* 310 * Check to see if we are sending files to a remote machine. If we are, 311 * then try removing files on the remote machine. 312 */ 313 void 314 rmremote(pp) 315 const struct printer *pp; 316 { 317 int i, rem, niov, totlen; 318 char buf[BUFSIZ]; 319 void (*savealrm)(int); 320 struct iovec *iov; 321 322 if (!pp->remote) 323 return; /* not sending to a remote machine */ 324 325 /* 326 * Flush stdout so the user can see what has been deleted 327 * while we wait (possibly) for the connection. 328 */ 329 fflush(stdout); 330 331 /* 332 * Counting: 333 * 4 == "\5" + remote_queue + " " + person 334 * 2 * users == " " + user[i] for each user 335 * requests == asprintf results for each request 336 * 1 == "\n" 337 * Although laborious, doing it this way makes it possible for 338 * us to process requests of indeterminate length without 339 * applying an arbitrary limit. Arbitrary Limits Are Bad (tm). 340 */ 341 niov = 4 + 2 * users + requests + 1; 342 iov = malloc(niov * sizeof *iov); 343 if (iov == 0) 344 fatal(pp, "out of memory"); 345 iov[0].iov_base = "\5"; 346 iov[1].iov_base = pp->remote_queue; 347 iov[2].iov_base = " "; 348 iov[3].iov_base = all ? "-all" : person; 349 for (i = 0; i < users; i++) { 350 iov[4 + 2 * i].iov_base = " "; 351 iov[4 + 2 * i + 1].iov_base = user[i]; 352 } 353 for (i = 0; i < requests; i++) { 354 asprintf(&iov[4 + 2 * users + i].iov_base, " %d", requ[i]); 355 if (iov[4 + 2 * users + i].iov_base == 0) 356 fatal(pp, "out of memory"); 357 } 358 iov[4 + 2 * users + requests].iov_base = "\n"; 359 for (totlen = i = 0; i < niov; i++) 360 totlen += (iov[i].iov_len = strlen(iov[i].iov_base)); 361 362 savealrm = signal(SIGALRM, alarmhandler); 363 alarm(pp->conn_timeout); 364 rem = getport(pp, pp->remote_host, 0); 365 (void)signal(SIGALRM, savealrm); 366 if (rem < 0) { 367 if (from != host) 368 printf("%s: ", host); 369 printf("connection to %s is down\n", pp->remote_host); 370 } else { 371 if (writev(rem, iov, niov) != totlen) 372 fatal(pp, "Lost connection"); 373 while ((i = read(rem, buf, sizeof(buf))) > 0) 374 (void) fwrite(buf, 1, i, stdout); 375 (void) close(rem); 376 } 377 for (i = 0; i < requests; i++) 378 free(iov[4 + 2 * users + i].iov_base); 379 free(iov); 380 } 381 382 /* 383 * Return 1 if the filename begins with 'cf' 384 */ 385 int 386 iscf(d) 387 struct dirent *d; 388 { 389 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 390 } 391 392 void 393 alarmhandler(signo) 394 int signo; 395 { 396 /* ignored */ 397 } 398