usr.sbin/lpr/chkprintcap/chkprintcap.c

   1 /*
   2  * Copyright 1997 Massachusetts Institute of Technology
   3  *
   4  * Permission to use, copy, modify, and distribute this software and
   5  * its documentation for any purpose and without fee is hereby
   6  * granted, provided that both the above copyright notice and this
   7  * permission notice appear in all copies, that both the above
   8  * copyright notice and this permission notice appear in all
   9  * supporting documentation, and that the name of M.I.T. not be used
  10  * in advertising or publicity pertaining to distribution of the
  11  * software without specific, written prior permission.  M.I.T. makes
  12  * no representations about the suitability of this software for any
  13  * purpose.  It is provided "as is" without express or implied
  14  * warranty.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
  17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
  20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (C) 1997, Massachusetts Institute of Technology
  30  * $FreeBSD: src/usr.sbin/lpr/chkprintcap/chkprintcap.c,v 1.3.2.2 2002/04/18 20:45:23 gad Exp $
  31  * $DragonFly: src/usr.sbin/lpr/chkprintcap/chkprintcap.c,v 1.2 2003/06/17 04:29:55 dillon Exp $
  32  */
  33
  34 #include <sys/types.h>
  35 #include <sys/queue.h>
  36 #include <sys/stat.h>
  37
  38 #include <err.h>
  39 #include <errno.h>
  40 #include <grp.h>
  41 #include <stdio.h>
  42 #include <string.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45
  46 #include <sys/param.h>          /* needed for lp.h but not used here */
  47 #include <dirent.h>             /* ditto */
  48 #include "lp.h"
  49 #include "lp.local.h"
  50 #include "pathnames.h"
  51 #include "skimprintcap.h"
  52
  53 static  void check_spool_dirs(void);
  54 static  int interpret_error(const struct printer *pp, int error);
  55 static  void make_spool_dir(const struct printer *pp);
  56 static  void note_spool_dir(const struct printer *pp, const struct stat *st);
  57 static  void usage(void) __dead2;
  58
  59 static  int problems;           /* number of problems encountered */
  60
  61 /*
  62  * chkprintcap - check the printcap file for syntactic and semantic errors
  63  * Returns the number of problems found.
  64  */
  65 int
  66 main(int argc, char **argv)
  67 {
  68         struct skiminfo *skres;
  69         char *pcap_fname;
  70         int c, error, makedirs, more, queuecnt, verbosity;
  71         struct printer myprinter, *pp;
  72
  73         makedirs = 0;
  74         queuecnt = 0;
  75         verbosity = 0;
  76         pcap_fname = NULL;
  77         pp = &myprinter;
  78
  79         while ((c = getopt(argc, argv, "df:v")) != -1) {
  80                 switch (c) {
  81                 case 'd':
  82                         makedirs = 1;
  83                         break;
  84
  85                 case 'f':
  86                         pcap_fname = strdup(optarg);
  87                         setprintcap(pcap_fname);
  88                         break;
  89
  90                 case 'v':
  91                         verbosity++;
  92                         break;
  93
  94                 default:
  95                         usage();
  96                 }
  97         }
  98
  99         if (optind != argc)
 100                 usage();
 101
 102         if (pcap_fname == NULL)
 103                 pcap_fname = strdup(_PATH_PRINTCAP);
 104
 105         /*
 106          * Skim through the printcap file looking for simple user-mistakes
 107          * which will produce the wrong result for the user, but which may
 108          * be pretty hard for the user to notice.  Such user-mistakes will
 109          * only generate warning messages.  The (fatal-) problem count will
 110          * only be incremented if there is a system problem trying to read
 111          * the printcap file.
 112         */
 113         skres = skim_printcap(pcap_fname, verbosity);
 114         if (skres->fatalerr)
 115                 return (skres->fatalerr);
 116
 117         /*
 118          * Now use the standard capability-db routines to check the values
 119          * in each of the queues defined in the printcap file.
 120         */
 121         more = firstprinter(pp, &error);
 122         if (interpret_error(pp, error) && more)
 123                 goto next;
 124
 125         while (more) {
 126                 struct stat stab;
 127
 128                 queuecnt++;
 129                 errno = 0;
 130                 if (stat(pp->spool_dir, &stab) < 0) {
 131                         if (errno == ENOENT && makedirs) {
 132                                 make_spool_dir(pp);
 133                         } else {
 134                                 problems++;
 135                                 warn("%s: %s", pp->printer, pp->spool_dir);
 136                         }
 137                 } else {
 138                         note_spool_dir(pp, &stab);
 139                 }
 140
 141                 /* Make other queue-specific validity checks here... */
 142
 143 next:
 144                 more = nextprinter(pp, &error);
 145                 if (interpret_error(pp, error) && more)
 146                         goto next;
 147         }
 148
 149         check_spool_dirs();
 150
 151         if (queuecnt != skres->entries) {
 152                 warnx("WARNING: found %d entries when skimming %s,",
 153                     skres->entries, pcap_fname);
 154                 warnx("WARNING:  but only found %d queues to process!",
 155                     queuecnt);
 156         }
 157         return (problems);
 158 }
 159
 160 /*
 161  * Interpret the error code.  Returns 1 if we should skip to the next
 162  * record (as this record is unlikely to make sense).  If the problem
 163  * is very severe, exit.  Otherwise, return zero.
 164  */
 165 static int
 166 interpret_error(const struct printer *pp, int error)
 167 {
 168         switch(error) {
 169         case PCAPERR_OSERR:
 170                 err(++problems, "reading printer database");
 171         case PCAPERR_TCLOOP:
 172                 ++problems;
 173                 warnx("%s: loop detected in tc= expansion", pp->printer);
 174                 return 1;
 175         case PCAPERR_TCOPEN:
 176                 warnx("%s: unresolved tc= expansion", pp->printer);
 177                 return 1;
 178         case PCAPERR_SUCCESS:
 179                 break;
 180         default:
 181                 errx(++problems, "unknown printcap library error %d", error);
 182         }
 183         return 0;
 184 }
 185
 186 /*
 187  * Keep the list of spool directories.  Note that we don't whine
 188  * until all spool directories are noted, so that all of the more serious
 189  * problems are noted first.  We keep the list sorted by st_dev and
 190  * st_ino, so that the problem spool directories can be noted in
 191  * a single loop.
 192  */
 193 struct  dirlist {
 194         LIST_ENTRY(dirlist) link;
 195         struct stat stab;
 196         char *path;
 197         char *printer;
 198 };
 199
 200 static  LIST_HEAD(, dirlist) dirlist;
 201
 202 static int
 203 lessp(const struct dirlist *a, const struct dirlist *b)
 204 {
 205         if (a->stab.st_dev == b->stab.st_dev)
 206                 return a->stab.st_ino < b->stab.st_ino;
 207         return a->stab.st_dev < b->stab.st_dev;
 208 }
 209
 210 static int
 211 equal(const struct dirlist *a, const struct dirlist *b)
 212 {
 213         return ((a->stab.st_dev == b->stab.st_dev)
 214                 && (a->stab.st_ino == b->stab.st_ino));
 215 }
 216
 217 static void
 218 note_spool_dir(const struct printer *pp, const struct stat *st)
 219 {
 220         struct dirlist *dp, *dp2, *last;
 221
 222         dp = malloc(sizeof *dp);
 223         if (dp == 0)
 224                 err(++problems, "malloc(%lu)", (u_long)sizeof *dp);
 225
 226         dp->stab = *st;
 227         dp->printer = strdup(pp->printer);
 228         if (dp->printer == 0)
 229                 err(++problems, "malloc(%lu)", strlen(pp->printer) + 1UL);
 230         dp->path = strdup(pp->spool_dir);
 231         if (dp->path == 0)
 232                 err(++problems, "malloc(%lu)", strlen(pp->spool_dir) + 1UL);
 233
 234         last = 0;
 235         LIST_FOREACH(dp2, &dirlist, link) {
 236                 if(!lessp(dp, dp2))
 237                         break;
 238                 last = dp2;
 239         }
 240
 241         if (last) {
 242                 LIST_INSERT_AFTER(last, dp, link);
 243         } else {
 244                 LIST_INSERT_HEAD(&dirlist, dp, link);
 245         }
 246 }
 247
 248 static void
 249 check_spool_dirs(void)
 250 {
 251         struct dirlist *dp, *dp2;
 252
 253         for (dp = LIST_FIRST(&dirlist); dp; dp = dp2) {
 254                 dp2 = LIST_NEXT(dp, link);
 255
 256                 if (dp2 != 0 && equal(dp, dp2)) {
 257                         ++problems;
 258                         if (strcmp(dp->path, dp2->path) == 0) {
 259                                 warnx("%s and %s share the same spool, %s",
 260                                       dp->printer, dp2->printer, dp->path);
 261                         } else {
 262                                 warnx("%s (%s) and %s (%s) are the same "
 263                                       "directory", dp->path, dp->printer,
 264                                       dp2->path, dp2->printer);
 265                         }
 266                         continue;
 267                 }
 268                 /* Should probably check owners and modes here. */
 269         }
 270 }
 271
 272 #ifndef SPOOL_DIR_MODE
 273 #define SPOOL_DIR_MODE  (S_IRUSR | S_IWUSR | S_IXUSR \
 274                          | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH)
 275 #endif
 276
 277 static void
 278 make_spool_dir(const struct printer *pp)
 279 {
 280         char *sd = pp->spool_dir;
 281         struct group *gr;
 282         struct stat stab;
 283
 284         if (mkdir(sd, S_IRUSR | S_IXUSR) < 0) {
 285                 problems++;
 286                 warn("%s: mkdir %s", pp->printer, sd);
 287                 return;
 288         }
 289         gr = getgrnam("daemon");
 290         if (gr == 0)
 291                 errx(++problems, "cannot locate daemon group");
 292
 293         if (chown(sd, pp->daemon_user, gr->gr_gid) < 0) {
 294                 ++problems;
 295                 warn("%s: cannot change ownership to %ld:%ld", sd,
 296                      (long)pp->daemon_user, (long)gr->gr_gid);
 297                 return;
 298         }
 299
 300         if (chmod(sd, SPOOL_DIR_MODE) < 0) {
 301                 ++problems;
 302                 warn("%s: cannot change mode to %lo", sd, (long)SPOOL_DIR_MODE);
 303                 return;
 304         }
 305         if (stat(sd, &stab) < 0)
 306                 err(++problems, "stat: %s", sd);
 307
 308         note_spool_dir(pp, &stab);
 309 }
 310
 311 static void
 312 usage(void)
 313 {
 314         fprintf(stderr, "usage:\n\tchkprintcap [-dv] [-f printcapfile]\n");
 315         exit(1);
 316 }