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 <errno.h> 45 #include <signal.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #define psignal foil_gcc_psignal 50 #define sys_siglist foil_gcc_siglist 51 #include <unistd.h> 52 #undef psignal 53 #undef sys_siglist 54 55 #include "lp.h" 56 #include "lp.local.h" 57 #include "pathnames.h" 58 59 /* 60 * rmjob - remove the specified jobs from the queue. 61 */ 62 63 /* 64 * Stuff for handling lprm specifications 65 */ 66 static char root[] = "root"; 67 static int all = 0; /* eliminate all files (root only) */ 68 static int cur_daemon; /* daemon's pid */ 69 static char current[7+MAXHOSTNAMELEN]; /* active control file name */ 70 71 extern uid_t uid, euid; /* real and effective user id's */ 72 73 static void alarmhandler(int _signo); 74 static void do_unlink(char *_file); 75 static int isowner(char *_owner, char *_file, const char *_cfhost); 76 77 void 78 rmjob(const char *printer) 79 { 80 register int i, nitems; 81 int assassinated = 0; 82 struct dirent **files; 83 char *cp; 84 struct printer myprinter, *pp = &myprinter; 85 86 init_printer(pp); 87 if ((i = getprintcap(printer, pp)) < 0) 88 fatal(pp, "getprintcap: %s", pcaperr(i)); 89 if ((cp = checkremote(pp))) { 90 printf("Warning: %s\n", cp); 91 free(cp); 92 } 93 94 /* 95 * If the format was `lprm -' and the user isn't the super-user, 96 * then fake things to look like he said `lprm user'. 97 */ 98 if (users < 0) { 99 if (getuid() == 0) 100 all = 1; /* all files in local queue */ 101 else { 102 user[0] = person; 103 users = 1; 104 } 105 } 106 if (!strcmp(person, "-all")) { 107 if (from_host == local_host) 108 fatal(pp, "The login name \"-all\" is reserved"); 109 all = 1; /* all those from 'from_host' */ 110 person = root; 111 } 112 113 seteuid(euid); 114 if (chdir(pp->spool_dir) < 0) 115 fatal(pp, "cannot chdir to spool directory"); 116 if ((nitems = scandir(".", &files, iscf, NULL)) < 0) 117 fatal(pp, "cannot access spool directory"); 118 seteuid(uid); 119 120 if (nitems) { 121 /* 122 * Check for an active printer daemon (in which case we 123 * kill it if it is reading our file) then remove stuff 124 * (after which we have to restart the daemon). 125 */ 126 if (lockchk(pp, pp->lock_file) && chk(current)) { 127 seteuid(euid); 128 assassinated = kill(cur_daemon, SIGINT) == 0; 129 seteuid(uid); 130 if (!assassinated) 131 fatal(pp, "cannot kill printer daemon"); 132 } 133 /* 134 * process the files 135 */ 136 for (i = 0; i < nitems; i++) 137 process(pp, files[i]->d_name); 138 } 139 rmremote(pp); 140 /* 141 * Restart the printer daemon if it was killed 142 */ 143 if (assassinated && !startdaemon(pp)) 144 fatal(pp, "cannot restart printer daemon\n"); 145 exit(0); 146 } 147 148 /* 149 * Process a lock file: collect the pid of the active 150 * daemon and the file name of the active spool entry. 151 * Return boolean indicating existence of a lock file. 152 */ 153 int 154 lockchk(struct printer *pp, char *slockf) 155 { 156 register FILE *fp; 157 register int i, n; 158 159 seteuid(euid); 160 if ((fp = fopen(slockf, "r")) == NULL) { 161 if (errno == EACCES) 162 fatal(pp, "%s: %s", slockf, strerror(errno)); 163 else 164 return(0); 165 } 166 seteuid(uid); 167 if (!getline(fp)) { 168 (void) fclose(fp); 169 return(0); /* no daemon present */ 170 } 171 cur_daemon = atoi(line); 172 if (kill(cur_daemon, 0) < 0 && errno != EPERM) { 173 (void) fclose(fp); 174 return(0); /* no daemon present */ 175 } 176 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) { 177 if (i > 5) { 178 n = 1; 179 break; 180 } 181 sleep(i); 182 } 183 current[n-1] = '\0'; 184 (void) fclose(fp); 185 return(1); 186 } 187 188 /* 189 * Process a control file. 190 */ 191 void 192 process(const struct printer *pp, char *file) 193 { 194 FILE *cfp; 195 196 if (!chk(file)) 197 return; 198 seteuid(euid); 199 if ((cfp = fopen(file, "r")) == NULL) 200 fatal(pp, "cannot open %s", file); 201 seteuid(uid); 202 while (getline(cfp)) { 203 switch (line[0]) { 204 case 'U': /* unlink associated files */ 205 if (strchr(line+1, '/') || strncmp(line+1, "df", 2)) 206 break; 207 do_unlink(line+1); 208 } 209 } 210 (void) fclose(cfp); 211 do_unlink(file); 212 } 213 214 static void 215 do_unlink(char *file) 216 { 217 int ret; 218 219 if (from_host != local_host) 220 printf("%s: ", local_host); 221 seteuid(euid); 222 ret = unlink(file); 223 seteuid(uid); 224 printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file); 225 } 226 227 /* 228 * Do the dirty work in checking 229 */ 230 int 231 chk(char *file) 232 { 233 int *r, jnum; 234 char **u; 235 const char *cfhost; 236 FILE *cfp; 237 238 /* 239 * Check for valid cf file name (mostly checking current). 240 */ 241 if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f') 242 return(0); 243 244 jnum = calc_jobnum(file, &cfhost); 245 if (all && (from_host == local_host || !strcmp(from_host, cfhost))) 246 return(1); 247 248 /* 249 * get the owner's name from the control file. 250 */ 251 seteuid(euid); 252 if ((cfp = fopen(file, "r")) == NULL) 253 return(0); 254 seteuid(uid); 255 while (getline(cfp)) { 256 if (line[0] == 'P') 257 break; 258 } 259 (void) fclose(cfp); 260 if (line[0] != 'P') 261 return(0); 262 263 if (users == 0 && requests == 0) 264 return(!strcmp(file, current) && isowner(line+1, file, cfhost)); 265 /* 266 * Check the request list 267 */ 268 for (r = requ; r < &requ[requests]; r++) 269 if (*r == jnum && isowner(line+1, file, cfhost)) 270 return(1); 271 /* 272 * Check to see if it's in the user list 273 */ 274 for (u = user; u < &user[users]; u++) 275 if (!strcmp(*u, line+1) && isowner(line+1, file, cfhost)) 276 return(1); 277 return(0); 278 } 279 280 /* 281 * If root is removing a file on the local machine, allow it. 282 * If root is removing a file from a remote machine, only allow 283 * files sent from the remote machine to be removed. 284 * Normal users can only remove the file from where it was sent. 285 */ 286 static int 287 isowner(char *owner, char *file, const char *cfhost) 288 { 289 if (!strcmp(person, root) && (from_host == local_host || 290 !strcmp(from_host, cfhost))) 291 return (1); 292 if (!strcmp(person, owner) && !strcmp(from_host, cfhost)) 293 return (1); 294 if (from_host != local_host) 295 printf("%s: ", local_host); 296 printf("%s: Permission denied\n", file); 297 return(0); 298 } 299 300 /* 301 * Check to see if we are sending files to a remote machine. If we are, 302 * then try removing files on the remote machine. 303 */ 304 void 305 rmremote(const struct printer *pp) 306 { 307 int i, elem, firstreq, niov, rem, totlen; 308 char buf[BUFSIZ]; 309 void (*savealrm)(int); 310 struct iovec *iov; 311 312 if (!pp->remote) 313 return; /* not sending to a remote machine */ 314 315 /* 316 * Flush stdout so the user can see what has been deleted 317 * while we wait (possibly) for the connection. 318 */ 319 fflush(stdout); 320 321 /* 322 * Counting: 323 * 4 == "\5" + remote_queue + " " + person 324 * 2 * users == " " + user[i] for each user 325 * requests == asprintf results for each request 326 * 1 == "\n" 327 * Although laborious, doing it this way makes it possible for 328 * us to process requests of indeterminate length without 329 * applying an arbitrary limit. Arbitrary Limits Are Bad (tm). 330 */ 331 if (users > 0) 332 niov = 4 + 2 * users + requests + 1; 333 else 334 niov = 4 + requests + 1; 335 iov = malloc(niov * sizeof *iov); 336 if (iov == 0) 337 fatal(pp, "out of memory in rmremote()"); 338 iov[0].iov_base = "\5"; 339 iov[1].iov_base = pp->remote_queue; 340 iov[2].iov_base = " "; 341 iov[3].iov_base = all ? "-all" : person; 342 elem = 4; 343 for (i = 0; i < users; i++) { 344 iov[elem].iov_base = " "; 345 iov[elem + 1].iov_base = user[i]; 346 elem += 2; 347 } 348 firstreq = elem; 349 for (i = 0; i < requests; i++) { 350 asprintf((char **)&iov[elem].iov_base, " %d", requ[i]); 351 if (iov[elem].iov_base == 0) 352 fatal(pp, "out of memory in rmremote()"); 353 elem++; 354 } 355 iov[elem++].iov_base = "\n"; 356 for (totlen = i = 0; i < niov; i++) 357 totlen += (iov[i].iov_len = strlen(iov[i].iov_base)); 358 359 savealrm = signal(SIGALRM, alarmhandler); 360 alarm(pp->conn_timeout); 361 rem = getport(pp, pp->remote_host, 0); 362 (void)signal(SIGALRM, savealrm); 363 if (rem < 0) { 364 if (from_host != local_host) 365 printf("%s: ", local_host); 366 printf("connection to %s is down\n", pp->remote_host); 367 } else { 368 if (writev(rem, iov, niov) != totlen) 369 fatal(pp, "Lost connection"); 370 while ((i = read(rem, buf, sizeof(buf))) > 0) 371 (void) fwrite(buf, 1, i, stdout); 372 (void) close(rem); 373 } 374 for (i = 0; i < requests; i++) 375 free(iov[firstreq + i].iov_base); 376 free(iov); 377 } 378 379 /* 380 * Return 1 if the filename begins with 'cf' 381 */ 382 int 383 iscf(const struct dirent *d) 384 { 385 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 386 } 387 388 void 389 alarmhandler(int signo __unused) 390 { 391 /* the signal is ignored */ 392 /* (the '__unused' is just to avoid a compile-time warning) */ 393 } 394