1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * 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 static char sccsid[] = "@(#)rmjob.c 5.10 (Berkeley) 8/31/92"; 36 #endif /* not lint */ 37 38 #include <sys/param.h> 39 40 #include <signal.h> 41 #include <errno.h> 42 #include <dirent.h> 43 #include <unistd.h> 44 #include <stdlib.h> 45 #include <stdio.h> 46 #include <string.h> 47 #include <ctype.h> 48 #include "lp.h" 49 #include "lp.local.h" 50 #include "pathnames.h" 51 52 /* 53 * rmjob - remove the specified jobs from the queue. 54 */ 55 56 /* 57 * Stuff for handling lprm specifications 58 */ 59 extern char *user[]; /* users to process */ 60 extern int users; /* # of users in user array */ 61 extern int requ[]; /* job number of spool entries */ 62 extern int requests; /* # of spool requests */ 63 extern char *person; /* name of person doing lprm */ 64 65 static char root[] = "root"; 66 static int all = 0; /* eliminate all files (root only) */ 67 static int cur_daemon; /* daemon's pid */ 68 static char current[40]; /* active control file name */ 69 70 void 71 rmjob() 72 { 73 register int i, nitems; 74 int assasinated = 0; 75 struct dirent **files; 76 char *cp; 77 78 if ((i = cgetent(&bp, printcapdb, printer)) == -2) 79 fatal("can't open printer description file"); 80 else if (i == -1) 81 fatal("unknown printer"); 82 else if (i == -3) 83 fatal("potential reference loop detected in printcap file"); 84 if (cgetstr(bp, "lp", &LP) < 0) 85 LP = _PATH_DEFDEVLP; 86 if (cgetstr(bp, "rp", &RP) < 0) 87 RP = DEFLP; 88 if (cgetstr(bp, "sd", &SD) < 0) 89 SD = _PATH_DEFSPOOL; 90 if (cgetstr(bp,"lo", &LO) < 0) 91 LO = DEFLOCK; 92 cgetstr(bp, "rm", &RM); 93 if (cp = checkremote()) 94 printf("Warning: %s\n", cp); 95 96 /* 97 * If the format was `lprm -' and the user isn't the super-user, 98 * then fake things to look like he said `lprm user'. 99 */ 100 if (users < 0) { 101 if (getuid() == 0) 102 all = 1; /* all files in local queue */ 103 else { 104 user[0] = person; 105 users = 1; 106 } 107 } 108 if (!strcmp(person, "-all")) { 109 if (from == host) 110 fatal("The login name \"-all\" is reserved"); 111 all = 1; /* all those from 'from' */ 112 person = root; 113 } 114 115 if (chdir(SD) < 0) 116 fatal("cannot chdir to spool directory"); 117 if ((nitems = scandir(".", &files, iscf, NULL)) < 0) 118 fatal("cannot access spool directory"); 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(LO) && chk(current)) { 127 assasinated = kill(cur_daemon, SIGINT) == 0; 128 if (!assasinated) 129 fatal("cannot kill printer daemon"); 130 } 131 /* 132 * process the files 133 */ 134 for (i = 0; i < nitems; i++) 135 process(files[i]->d_name); 136 } 137 rmremote(); 138 /* 139 * Restart the printer daemon if it was killed 140 */ 141 if (assasinated && !startdaemon(printer)) 142 fatal("cannot restart printer daemon\n"); 143 exit(0); 144 } 145 146 /* 147 * Process a lock file: collect the pid of the active 148 * daemon and the file name of the active spool entry. 149 * Return boolean indicating existence of a lock file. 150 */ 151 int 152 lockchk(s) 153 char *s; 154 { 155 register FILE *fp; 156 register int i, n; 157 158 if ((fp = fopen(s, "r")) == NULL) 159 if (errno == EACCES) 160 fatal("can't access lock file"); 161 else 162 return(0); 163 if (!getline(fp)) { 164 (void) fclose(fp); 165 return(0); /* no daemon present */ 166 } 167 cur_daemon = atoi(line); 168 if (kill(cur_daemon, 0) < 0) { 169 (void) fclose(fp); 170 return(0); /* no daemon present */ 171 } 172 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) { 173 if (i > 5) { 174 n = 1; 175 break; 176 } 177 sleep(i); 178 } 179 current[n-1] = '\0'; 180 (void) fclose(fp); 181 return(1); 182 } 183 184 /* 185 * Process a control file. 186 */ 187 void 188 process(file) 189 char *file; 190 { 191 FILE *cfp; 192 193 if (!chk(file)) 194 return; 195 if ((cfp = fopen(file, "r")) == NULL) 196 fatal("cannot open %s", file); 197 while (getline(cfp)) { 198 switch (line[0]) { 199 case 'U': /* unlink associated files */ 200 if (from != host) 201 printf("%s: ", host); 202 printf(unlink(line+1) ? "cannot dequeue %s\n" : 203 "%s dequeued\n", line+1); 204 } 205 } 206 (void) fclose(cfp); 207 if (from != host) 208 printf("%s: ", host); 209 printf(unlink(file) ? "cannot dequeue %s\n" : "%s dequeued\n", file); 210 } 211 212 /* 213 * Do the dirty work in checking 214 */ 215 int 216 chk(file) 217 char *file; 218 { 219 register int *r, n; 220 register char **u, *cp; 221 FILE *cfp; 222 223 /* 224 * Check for valid cf file name (mostly checking current). 225 */ 226 if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f') 227 return(0); 228 229 if (all && (from == host || !strcmp(from, file+6))) 230 return(1); 231 232 /* 233 * get the owner's name from the control file. 234 */ 235 if ((cfp = fopen(file, "r")) == NULL) 236 return(0); 237 while (getline(cfp)) { 238 if (line[0] == 'P') 239 break; 240 } 241 (void) fclose(cfp); 242 if (line[0] != 'P') 243 return(0); 244 245 if (users == 0 && requests == 0) 246 return(!strcmp(file, current) && isowner(line+1, file)); 247 /* 248 * Check the request list 249 */ 250 for (n = 0, cp = file+3; isdigit(*cp); ) 251 n = n * 10 + (*cp++ - '0'); 252 for (r = requ; r < &requ[requests]; r++) 253 if (*r == n && isowner(line+1, file)) 254 return(1); 255 /* 256 * Check to see if it's in the user list 257 */ 258 for (u = user; u < &user[users]; u++) 259 if (!strcmp(*u, line+1) && isowner(line+1, file)) 260 return(1); 261 return(0); 262 } 263 264 /* 265 * If root is removing a file on the local machine, allow it. 266 * If root is removing a file from a remote machine, only allow 267 * files sent from the remote machine to be removed. 268 * Normal users can only remove the file from where it was sent. 269 */ 270 int 271 isowner(owner, file) 272 char *owner, *file; 273 { 274 if (!strcmp(person, root) && (from == host || !strcmp(from, file+6))) 275 return(1); 276 if (!strcmp(person, owner) && !strcmp(from, file+6)) 277 return(1); 278 if (from != host) 279 printf("%s: ", host); 280 printf("%s: Permission denied\n", file); 281 return(0); 282 } 283 284 /* 285 * Check to see if we are sending files to a remote machine. If we are, 286 * then try removing files on the remote machine. 287 */ 288 void 289 rmremote() 290 { 291 register char *cp; 292 register int i, rem; 293 char buf[BUFSIZ]; 294 295 if (!sendtorem) 296 return; /* not sending to a remote machine */ 297 298 /* 299 * Flush stdout so the user can see what has been deleted 300 * while we wait (possibly) for the connection. 301 */ 302 fflush(stdout); 303 304 (void)snprintf(buf, sizeof(buf), "\5%s %s", RP, all ? "-all" : person); 305 cp = buf; 306 for (i = 0; i < users; i++) { 307 cp += strlen(cp); 308 *cp++ = ' '; 309 strcpy(cp, user[i]); 310 } 311 for (i = 0; i < requests; i++) { 312 cp += strlen(cp); 313 (void) sprintf(cp, " %d", requ[i]); 314 } 315 strcat(cp, "\n"); 316 rem = getport(RM); 317 if (rem < 0) { 318 if (from != host) 319 printf("%s: ", host); 320 printf("connection to %s is down\n", RM); 321 } else { 322 i = strlen(buf); 323 if (write(rem, buf, i) != i) 324 fatal("Lost connection"); 325 while ((i = read(rem, buf, sizeof(buf))) > 0) 326 (void) fwrite(buf, 1, i, stdout); 327 (void) close(rem); 328 } 329 } 330 331 /* 332 * Return 1 if the filename begins with 'cf' 333 */ 334 int 335 iscf(d) 336 struct dirent *d; 337 { 338 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 339 } 340