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[] = "from: @(#)rmjob.c 5.7 (Berkeley) 6/1/90";*/ 36 static char rcsid[] = "$Id: rmjob.c,v 1.2 1993/08/01 17:59:11 mycroft Exp $"; 37 #endif /* not lint */ 38 39 /* 40 * rmjob - remove the specified jobs from the queue. 41 */ 42 43 #include "lp.h" 44 #include "pathnames.h" 45 46 /* 47 * Stuff for handling lprm specifications 48 */ 49 extern char *user[]; /* users to process */ 50 extern int users; /* # of users in user array */ 51 extern int requ[]; /* job number of spool entries */ 52 extern int requests; /* # of spool requests */ 53 extern char *person; /* name of person doing lprm */ 54 55 char root[] = "root"; 56 int all = 0; /* eliminate all files (root only) */ 57 int cur_daemon; /* daemon's pid */ 58 char current[40]; /* active control file name */ 59 60 int iscf(); 61 62 rmjob() 63 { 64 register int i, nitems; 65 int assasinated = 0; 66 struct direct **files; 67 char *cp; 68 69 if ((i = pgetent(line, printer)) < 0) 70 fatal("cannot open printer description file"); 71 else if (i == 0) 72 fatal("unknown printer"); 73 if ((SD = pgetstr("sd", &bp)) == NULL) 74 SD = _PATH_DEFSPOOL; 75 if ((LO = pgetstr("lo", &bp)) == NULL) 76 LO = DEFLOCK; 77 if ((LP = pgetstr("lp", &bp)) == NULL) 78 LP = _PATH_DEFDEVLP; 79 if ((RP = pgetstr("rp", &bp)) == NULL) 80 RP = DEFLP; 81 RM = pgetstr("rm", &bp); 82 if (cp = checkremote()) 83 printf("Warning: %s\n", cp); 84 85 /* 86 * If the format was `lprm -' and the user isn't the super-user, 87 * then fake things to look like he said `lprm user'. 88 */ 89 if (users < 0) { 90 if (getuid() == 0) 91 all = 1; /* all files in local queue */ 92 else { 93 user[0] = person; 94 users = 1; 95 } 96 } 97 if (!strcmp(person, "-all")) { 98 if (from == host) 99 fatal("The login name \"-all\" is reserved"); 100 all = 1; /* all those from 'from' */ 101 person = root; 102 } 103 104 if (chdir(SD) < 0) 105 fatal("cannot chdir to spool directory"); 106 if ((nitems = scandir(".", &files, iscf, NULL)) < 0) 107 fatal("cannot access spool directory"); 108 109 if (nitems) { 110 /* 111 * Check for an active printer daemon (in which case we 112 * kill it if it is reading our file) then remove stuff 113 * (after which we have to restart the daemon). 114 */ 115 if (lockchk(LO) && chk(current)) { 116 assasinated = kill(cur_daemon, SIGINT) == 0; 117 if (!assasinated) 118 fatal("cannot kill printer daemon"); 119 } 120 /* 121 * process the files 122 */ 123 for (i = 0; i < nitems; i++) 124 process(files[i]->d_name); 125 } 126 rmremote(); 127 /* 128 * Restart the printer daemon if it was killed 129 */ 130 if (assasinated && !startdaemon(printer)) 131 fatal("cannot restart printer daemon\n"); 132 exit(0); 133 } 134 135 /* 136 * Process a lock file: collect the pid of the active 137 * daemon and the file name of the active spool entry. 138 * Return boolean indicating existence of a lock file. 139 */ 140 lockchk(s) 141 char *s; 142 { 143 register FILE *fp; 144 register int i, n; 145 146 if ((fp = fopen(s, "r")) == NULL) 147 if (errno == EACCES) 148 fatal("can't access lock file"); 149 else 150 return(0); 151 if (!getline(fp)) { 152 (void) fclose(fp); 153 return(0); /* no daemon present */ 154 } 155 cur_daemon = atoi(line); 156 if (kill(cur_daemon, 0) < 0) { 157 (void) fclose(fp); 158 return(0); /* no daemon present */ 159 } 160 for (i = 1; (n = fread(current, sizeof(char), sizeof(current), fp)) <= 0; i++) { 161 if (i > 5) { 162 n = 1; 163 break; 164 } 165 sleep(i); 166 } 167 current[n-1] = '\0'; 168 (void) fclose(fp); 169 return(1); 170 } 171 172 /* 173 * Process a control file. 174 */ 175 process(file) 176 char *file; 177 { 178 FILE *cfp; 179 180 if (!chk(file)) 181 return; 182 if ((cfp = fopen(file, "r")) == NULL) 183 fatal("cannot open %s", file); 184 while (getline(cfp)) { 185 switch (line[0]) { 186 case 'U': /* unlink associated files */ 187 if (from != host) 188 printf("%s: ", host); 189 printf(unlink(line+1) ? "cannot dequeue %s\n" : 190 "%s dequeued\n", line+1); 191 } 192 } 193 (void) fclose(cfp); 194 if (from != host) 195 printf("%s: ", host); 196 printf(unlink(file) ? "cannot dequeue %s\n" : "%s dequeued\n", file); 197 } 198 199 /* 200 * Do the dirty work in checking 201 */ 202 chk(file) 203 char *file; 204 { 205 register int *r, n; 206 register char **u, *cp; 207 FILE *cfp; 208 209 /* 210 * Check for valid cf file name (mostly checking current). 211 */ 212 if (strlen(file) < 7 || file[0] != 'c' || file[1] != 'f') 213 return(0); 214 215 if (all && (from == host || !strcmp(from, file+6))) 216 return(1); 217 218 /* 219 * get the owner's name from the control file. 220 */ 221 if ((cfp = fopen(file, "r")) == NULL) 222 return(0); 223 while (getline(cfp)) { 224 if (line[0] == 'P') 225 break; 226 } 227 (void) fclose(cfp); 228 if (line[0] != 'P') 229 return(0); 230 231 if (users == 0 && requests == 0) 232 return(!strcmp(file, current) && isowner(line+1, file)); 233 /* 234 * Check the request list 235 */ 236 for (n = 0, cp = file+3; isdigit(*cp); ) 237 n = n * 10 + (*cp++ - '0'); 238 for (r = requ; r < &requ[requests]; r++) 239 if (*r == n && isowner(line+1, file)) 240 return(1); 241 /* 242 * Check to see if it's in the user list 243 */ 244 for (u = user; u < &user[users]; u++) 245 if (!strcmp(*u, line+1) && isowner(line+1, file)) 246 return(1); 247 return(0); 248 } 249 250 /* 251 * If root is removing a file on the local machine, allow it. 252 * If root is removing a file from a remote machine, only allow 253 * files sent from the remote machine to be removed. 254 * Normal users can only remove the file from where it was sent. 255 */ 256 isowner(owner, file) 257 char *owner, *file; 258 { 259 if (!strcmp(person, root) && (from == host || !strcmp(from, file+6))) 260 return(1); 261 if (!strcmp(person, owner) && !strcmp(from, file+6)) 262 return(1); 263 if (from != host) 264 printf("%s: ", host); 265 printf("%s: Permission denied\n", file); 266 return(0); 267 } 268 269 /* 270 * Check to see if we are sending files to a remote machine. If we are, 271 * then try removing files on the remote machine. 272 */ 273 rmremote() 274 { 275 register char *cp; 276 register int i, rem; 277 char buf[BUFSIZ]; 278 279 if (!sendtorem) 280 return; /* not sending to a remote machine */ 281 282 /* 283 * Flush stdout so the user can see what has been deleted 284 * while we wait (possibly) for the connection. 285 */ 286 fflush(stdout); 287 288 sprintf(buf, "\5%s %s", RP, all ? "-all" : person); 289 cp = buf; 290 for (i = 0; i < users; i++) { 291 cp += strlen(cp); 292 *cp++ = ' '; 293 strcpy(cp, user[i]); 294 } 295 for (i = 0; i < requests; i++) { 296 cp += strlen(cp); 297 (void) sprintf(cp, " %d", requ[i]); 298 } 299 strcat(cp, "\n"); 300 rem = getport(RM); 301 if (rem < 0) { 302 if (from != host) 303 printf("%s: ", host); 304 printf("connection to %s is down\n", RM); 305 } else { 306 i = strlen(buf); 307 if (write(rem, buf, i) != i) 308 fatal("Lost connection"); 309 while ((i = read(rem, buf, sizeof(buf))) > 0) 310 (void) fwrite(buf, 1, i, stdout); 311 (void) close(rem); 312 } 313 } 314 315 /* 316 * Return 1 if the filename begins with 'cf' 317 */ 318 iscf(d) 319 struct direct *d; 320 { 321 return(d->d_name[0] == 'c' && d->d_name[1] == 'f'); 322 } 323