1 /* $NetBSD: rmjob.c,v 1.11 1997/07/10 06:19:54 mikel Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)rmjob.c 8.1 (Berkeley) 6/6/93"; 39 #else 40 static char rcsid[] = "$NetBSD"; 41 #endif 42 #endif /* not lint */ 43 44 #include <sys/param.h> 45 46 #include <signal.h> 47 #include <errno.h> 48 #include <dirent.h> 49 #include <unistd.h> 50 #include <stdlib.h> 51 #include <stdio.h> 52 #include <string.h> 53 #include <ctype.h> 54 #include "lp.h" 55 #include "lp.local.h" 56 #include "pathnames.h" 57 58 /* 59 * rmjob - remove the specified jobs from the queue. 60 */ 61 62 /* 63 * Stuff for handling lprm specifications 64 */ 65 extern char *user[]; /* users to process */ 66 extern int users; /* # of users in user array */ 67 extern int requ[]; /* job number of spool entries */ 68 extern int requests; /* # of spool requests */ 69 extern char *person; /* name of person doing lprm */ 70 71 static char root[] = "root"; 72 static int all = 0; /* eliminate all files (root only) */ 73 static int cur_daemon; /* daemon's pid */ 74 static char current[40]; /* active control file name */ 75 76 extern uid_t uid, euid; /* real and effective user id's */ 77 78 static void do_unlink __P((char *)); 79 80 void 81 rmjob() 82 { 83 register int i, nitems; 84 int assasinated = 0; 85 struct dirent **files; 86 char *cp; 87 88 if ((i = cgetent(&bp, printcapdb, printer)) == -2) 89 fatal("can't open printer description file"); 90 else if (i == -1) 91 fatal("unknown printer"); 92 else if (i == -3) 93 fatal("potential reference loop detected in printcap file"); 94 if (cgetstr(bp, "lp", &LP) < 0) 95 LP = _PATH_DEFDEVLP; 96 if (cgetstr(bp, "rp", &RP) < 0) 97 RP = DEFLP; 98 if (cgetstr(bp, "sd", &SD) < 0) 99 SD = _PATH_DEFSPOOL; 100 if (cgetstr(bp,"lo", &LO) < 0) 101 LO = DEFLOCK; 102 cgetstr(bp, "rm", &RM); 103 if ((cp = checkremote()) != NULL) 104 printf("Warning: %s\n", cp); 105 106 /* 107 * If the format was `lprm -' and the user isn't the super-user, 108 * then fake things to look like he said `lprm user'. 109 */ 110 if (users < 0) { 111 if (getuid() == 0) 112 all = 1; /* all files in local queue */ 113 else { 114 user[0] = person; 115 users = 1; 116 } 117 } 118 if (!strcmp(person, "-all")) { 119 if (from == host) 120 fatal("The login name \"-all\" is reserved"); 121 all = 1; /* all those from 'from' */ 122 person = root; 123 } 124 125 seteuid(euid); 126 if (chdir(SD) < 0) 127 fatal("cannot chdir to spool directory"); 128 if ((nitems = scandir(".", &files, iscf, NULL)) < 0) 129 fatal("cannot access spool directory"); 130 seteuid(uid); 131 132 if (nitems) { 133 /* 134 * Check for an active printer daemon (in which case we 135 * kill it if it is reading our file) then remove stuff 136 * (after which we have to restart the daemon). 137 */ 138 if (lockchk(LO) && chk(current)) { 139 seteuid(euid); 140 assasinated = kill(cur_daemon, SIGINT) == 0; 141 seteuid(uid); 142 if (!assasinated) 143 fatal("cannot kill printer daemon"); 144 } 145 /* 146 * process the files 147 */ 148 for (i = 0; i < nitems; i++) 149 process(files[i]->d_name); 150 } 151 rmremote(); 152 /* 153 * Restart the printer daemon if it was killed 154 */ 155 if (assasinated && !startdaemon(printer)) 156 fatal("cannot restart printer daemon\n"); 157 exit(0); 158 } 159 160 /* 161 * Process a lock file: collect the pid of the active 162 * daemon and the file name of the active spool entry. 163 * Return boolean indicating existence of a lock file. 164 */ 165 int 166 lockchk(s) 167 char *s; 168 { 169 register FILE *fp; 170 register int i, n; 171 172 seteuid(euid); 173 if ((fp = fopen(s, "r")) == NULL) { 174 if (errno == EACCES) 175 fatal("can't access lock file"); 176 else 177 return(0); 178 } 179 seteuid(uid); 180 if (!getline(fp)) { 181 (void)fclose(fp); 182 return(0); /* no daemon present */ 183 } 184 cur_daemon = atoi(line); 185 if (kill(cur_daemon, 0) < 0 && errno != EPERM) { 186 (void)fclose(fp); 187 return(0); /* no daemon present */ 188 } 189 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) { 190 if (i > 5) { 191 n = 1; 192 break; 193 } 194 sleep(i); 195 } 196 current[n-1] = '\0'; 197 (void)fclose(fp); 198 return(1); 199 } 200 201 /* 202 * Process a control file. 203 */ 204 void 205 process(file) 206 char *file; 207 { 208 FILE *cfp; 209 210 if (!chk(file)) 211 return; 212 seteuid(euid); 213 if ((cfp = fopen(file, "r")) == NULL) 214 fatal("cannot open %s", file); 215 seteuid(uid); 216 while (getline(cfp)) { 217 switch (line[0]) { 218 case 'U': /* unlink associated files */ 219 do_unlink(line+1); 220 } 221 } 222 (void)fclose(cfp); 223 do_unlink(file); 224 } 225 226 static void 227 do_unlink(file) 228 char *file; 229 { 230 int ret; 231 232 if (from != host) 233 printf("%s: ", host); 234 seteuid(euid); 235 ret = unlink(file); 236 seteuid(uid); 237 printf(ret ? "cannot dequeue %s\n" : "%s dequeued\n", file); 238 } 239 240 /* 241 * Do the dirty work in checking 242 */ 243 int 244 chk(file) 245 char *file; 246 { 247 register int *r, n; 248 register char **u, *cp; 249 FILE *cfp; 250 251 /* 252 * Check for valid cf file name (mostly checking current). 253 */ 254 if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f') 255 return(0); 256 257 if (all && (from == host || !strcmp(from, file+6))) 258 return(1); 259 260 /* 261 * get the owner's name from the control file. 262 */ 263 seteuid(euid); 264 if ((cfp = fopen(file, "r")) == NULL) 265 return(0); 266 seteuid(uid); 267 while (getline(cfp)) { 268 if (line[0] == 'P') 269 break; 270 } 271 (void)fclose(cfp); 272 if (line[0] != 'P') 273 return(0); 274 275 if (users == 0 && requests == 0) 276 return(!strcmp(file, current) && isowner(line+1, file)); 277 /* 278 * Check the request list 279 */ 280 for (n = 0, cp = file+3; isdigit(*cp); ) 281 n = n * 10 + (*cp++ - '0'); 282 for (r = requ; r < &requ[requests]; r++) 283 if (*r == n && isowner(line+1, file)) 284 return(1); 285 /* 286 * Check to see if it's in the user list 287 */ 288 for (u = user; u < &user[users]; u++) 289 if (!strcmp(*u, line+1) && isowner(line+1, file)) 290 return(1); 291 return(0); 292 } 293 294 /* 295 * If root is removing a file on the local machine, allow it. 296 * If root is removing a file from a remote machine, only allow 297 * files sent from the remote machine to be removed. 298 * Normal users can only remove the file from where it was sent. 299 */ 300 int 301 isowner(owner, file) 302 char *owner, *file; 303 { 304 if (!strcmp(person, root) && (from == host || !strcmp(from, file+6))) 305 return(1); 306 if (!strcmp(person, owner) && !strcmp(from, file+6)) 307 return(1); 308 if (from != host) 309 printf("%s: ", host); 310 printf("%s: Permission denied\n", file); 311 return(0); 312 } 313 314 /* 315 * Check to see if we are sending files to a remote machine. If we are, 316 * then try removing files on the remote machine. 317 */ 318 void 319 rmremote() 320 { 321 register char *cp, *s; 322 register int i, rem, len; 323 324 if (!sendtorem) 325 return; /* not sending to a remote machine */ 326 327 /* 328 * Flush stdout so the user can see what has been deleted 329 * while we wait (possibly) for the connection. 330 */ 331 fflush(stdout); 332 333 /* \5 RP space all */ 334 len = 1 + strlen(RP) + 1 + strlen(all ? "-all" : person); 335 for (i = 0; i < users; i++) { 336 len += strlen(user[i]) + 1; 337 } 338 for (i = 0; i < requests; i++) { 339 len += snprintf(line, sizeof(line), " %d", requ[i]); 340 } 341 /* newline nul */ 342 len += 2; 343 if (len > sizeof(line)) 344 s = malloc(len); 345 else 346 s = line; 347 cp = s; 348 349 cp += snprintf(s, len, "\5%s %s", RP, all ? "-all" : person); 350 for (i = 0; i < users; i++) { 351 *cp++ = ' '; 352 strncpy(cp, user[i], len - (cp - s) - 2); 353 cp += strlen(cp); 354 } 355 for (i = 0; i < requests; i++) { 356 (void)snprintf(cp, len - (cp - s) - 1, " %d", requ[i]); 357 cp += strlen(cp); 358 } 359 cp[0] = '\n'; 360 cp[1] = '\0'; 361 362 rem = getport(RM); 363 if (rem < 0) { 364 if (from != host) 365 printf("%s: ", host); 366 printf("connection to %s is down\n", RM); 367 } else { 368 if (write(rem, s, len) != len) 369 fatal("Lost connection"); 370 if (len > sizeof(line)) 371 (void)free(s); 372 while ((i = read(rem, line, sizeof(line))) > 0) 373 (void)fwrite(line, 1, i, stdout); 374 (void)close(rem); 375 } 376 } 377 378 /* 379 * Return 1 if the filename begins with 'cf' 380 */ 381 int 382 iscf(d) 383 struct dirent *d; 384 { 385 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 386 } 387