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 80 void 81 rmjob(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 == local_host) 111 fatal(pp, "The login name \"-all\" is reserved"); 112 all = 1; /* all those from 'from_host' */ 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(struct printer *pp, char *slockf) 158 { 159 register FILE *fp; 160 register int i, n; 161 162 seteuid(euid); 163 if ((fp = fopen(slockf, "r")) == NULL) { 164 if (errno == EACCES) 165 fatal(pp, "%s: %s", slockf, strerror(errno)); 166 else 167 return(0); 168 } 169 seteuid(uid); 170 if (!getline(fp)) { 171 (void) fclose(fp); 172 return(0); /* no daemon present */ 173 } 174 cur_daemon = atoi(line); 175 if (kill(cur_daemon, 0) < 0 && errno != EPERM) { 176 (void) fclose(fp); 177 return(0); /* no daemon present */ 178 } 179 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) { 180 if (i > 5) { 181 n = 1; 182 break; 183 } 184 sleep(i); 185 } 186 current[n-1] = '\0'; 187 (void) fclose(fp); 188 return(1); 189 } 190 191 /* 192 * Process a control file. 193 */ 194 void 195 process(const struct printer *pp, char *file) 196 { 197 FILE *cfp; 198 199 if (!chk(file)) 200 return; 201 seteuid(euid); 202 if ((cfp = fopen(file, "r")) == NULL) 203 fatal(pp, "cannot open %s", file); 204 seteuid(uid); 205 while (getline(cfp)) { 206 switch (line[0]) { 207 case 'U': /* unlink associated files */ 208 if (strchr(line+1, '/') || strncmp(line+1, "df", 2)) 209 break; 210 do_unlink(line+1); 211 } 212 } 213 (void) fclose(cfp); 214 do_unlink(file); 215 } 216 217 static void 218 do_unlink(char *file) 219 { 220 int ret; 221 222 if (from_host != local_host) 223 printf("%s: ", local_host); 224 seteuid(euid); 225 ret = unlink(file); 226 seteuid(uid); 227 printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file); 228 } 229 230 /* 231 * Do the dirty work in checking 232 */ 233 int 234 chk(char *file) 235 { 236 register int *r, n; 237 register char **u, *cp; 238 FILE *cfp; 239 240 /* 241 * Check for valid cf file name (mostly checking current). 242 */ 243 if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f') 244 return(0); 245 246 if (all && (from_host == local_host || !strcmp(from_host, file+6))) 247 return(1); 248 249 /* 250 * get the owner's name from the control file. 251 */ 252 seteuid(euid); 253 if ((cfp = fopen(file, "r")) == NULL) 254 return(0); 255 seteuid(uid); 256 while (getline(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)); 266 /* 267 * Check the request list 268 */ 269 for (n = 0, cp = file+3; isdigit(*cp); ) 270 n = n * 10 + (*cp++ - '0'); 271 for (r = requ; r < &requ[requests]; r++) 272 if (*r == n && isowner(line+1, file)) 273 return(1); 274 /* 275 * Check to see if it's in the user list 276 */ 277 for (u = user; u < &user[users]; u++) 278 if (!strcmp(*u, line+1) && isowner(line+1, file)) 279 return(1); 280 return(0); 281 } 282 283 /* 284 * If root is removing a file on the local machine, allow it. 285 * If root is removing a file from a remote machine, only allow 286 * files sent from the remote machine to be removed. 287 * Normal users can only remove the file from where it was sent. 288 */ 289 int 290 isowner(char *owner, char *file) 291 { 292 if (!strcmp(person, root) && (from_host == local_host || 293 !strcmp(from_host, file+6))) 294 return (1); 295 if (!strcmp(person, owner) && !strcmp(from_host, file+6)) 296 return (1); 297 if (from_host != local_host) 298 printf("%s: ", local_host); 299 printf("%s: Permission denied\n", file); 300 return(0); 301 } 302 303 /* 304 * Check to see if we are sending files to a remote machine. If we are, 305 * then try removing files on the remote machine. 306 */ 307 void 308 rmremote(const struct printer *pp) 309 { 310 int i, elem, firstreq, niov, rem, totlen; 311 char buf[BUFSIZ]; 312 void (*savealrm)(int); 313 struct iovec *iov; 314 315 if (!pp->remote) 316 return; /* not sending to a remote machine */ 317 318 /* 319 * Flush stdout so the user can see what has been deleted 320 * while we wait (possibly) for the connection. 321 */ 322 fflush(stdout); 323 324 /* 325 * Counting: 326 * 4 == "\5" + remote_queue + " " + person 327 * 2 * users == " " + user[i] for each user 328 * requests == asprintf results for each request 329 * 1 == "\n" 330 * Although laborious, doing it this way makes it possible for 331 * us to process requests of indeterminate length without 332 * applying an arbitrary limit. Arbitrary Limits Are Bad (tm). 333 */ 334 if (users > 0) 335 niov = 4 + 2 * users + requests + 1; 336 else 337 niov = 4 + requests + 1; 338 iov = malloc(niov * sizeof *iov); 339 if (iov == 0) 340 fatal(pp, "out of memory in rmremote()"); 341 iov[0].iov_base = "\5"; 342 iov[1].iov_base = pp->remote_queue; 343 iov[2].iov_base = " "; 344 iov[3].iov_base = all ? "-all" : person; 345 elem = 4; 346 for (i = 0; i < users; i++) { 347 iov[elem].iov_base = " "; 348 iov[elem + 1].iov_base = user[i]; 349 elem += 2; 350 } 351 firstreq = elem; 352 for (i = 0; i < requests; i++) { 353 asprintf((char **)&iov[elem].iov_base, " %d", requ[i]); 354 if (iov[elem].iov_base == 0) 355 fatal(pp, "out of memory in rmremote()"); 356 elem++; 357 } 358 iov[elem++].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 != local_host) 368 printf("%s: ", local_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[firstreq + i].iov_base); 379 free(iov); 380 } 381 382 /* 383 * Return 1 if the filename begins with 'cf' 384 */ 385 int 386 iscf(struct dirent *d) 387 { 388 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 389 } 390 391 void 392 alarmhandler(int signo __unused) 393 { 394 /* the signal is ignored */ 395 /* (the '__unused' is just to avoid a compile-time warning) */ 396 } 397