usr.sbin/lpr/lpd/recvjob.c

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. All advertising materials mentioning features or use of this software
  15  *    must display the following acknowledgement:
  16  *      This product includes software developed by the University of
  17  *      California, Berkeley and its contributors.
  18  * 4. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * @(#) Copyright (c) 1983, 1993 The Regents of the University of California.  All rights reserved.
  35  * @(#)recvjob.c        8.2 (Berkeley) 4/27/95
  36  * $FreeBSD: src/usr.sbin/lpr/lpd/recvjob.c,v 1.14.2.13 2002/06/19 01:46:48 gad Exp $
  37  * $DragonFly: src/usr.sbin/lpr/lpd/recvjob.c,v 1.4 2004/12/18 22:48:03 swildner Exp $
  38  */
  39
  40 /*
  41  * Receive printer jobs from the network, queue them and
  42  * start the printer daemon.
  43  */
  44 #include <sys/param.h>
  45 #include <sys/mount.h>
  46 #include <sys/stat.h>
  47
  48 #include <unistd.h>
  49 #include <signal.h>
  50 #include <fcntl.h>
  51 #include <dirent.h>
  52 #include <errno.h>
  53 #include <syslog.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include "lp.h"
  58 #include "lp.local.h"
  59 #include "ctlinfo.h"
  60 #include "extern.h"
  61 #include "pathnames.h"
  62
  63 #define ack()   write(STDOUT_FILENO, sp, (size_t)1);
  64
  65 static char      dfname[NAME_MAX];      /* data files */
  66 static int       minfree;       /* keep at least minfree blocks available */
  67 static const char       *sp = "";
  68 static char      tfname[NAME_MAX];      /* tmp copy of cf before linking */
  69
  70 static int       chksize(int _size);
  71 static void      frecverr(const char *_msg, ...) __printf0like(1, 2);
  72 static int       noresponse(void);
  73 static void      rcleanup(int _signo);
  74 static int       read_number(const char *_fn);
  75 static int       readfile(struct printer *_pp, char *_file, size_t _size);
  76 static int       readjob(struct printer *_pp);
  77
  78
  79 void
  80 recvjob(const char *printer)
  81 {
  82         struct stat stb;
  83         int status;
  84         struct printer myprinter, *pp = &myprinter;
  85
  86         /*
  87          * Perform lookup for printer name or abbreviation
  88          */
  89         init_printer(pp);
  90         status = getprintcap(printer, pp);
  91         switch (status) {
  92         case PCAPERR_OSERR:
  93                 frecverr("cannot open printer description file");
  94                 break;
  95         case PCAPERR_NOTFOUND:
  96                 frecverr("unknown printer %s", printer);
  97                 break;
  98         case PCAPERR_TCLOOP:
  99                 fatal(pp, "potential reference loop detected in printcap file");
 100         default:
 101                 break;
 102         }
 103
 104         close(2);                       /* set up log file */
 105         if (open(pp->log_file, O_WRONLY|O_APPEND, 0664) < 0) {
 106                 syslog(LOG_ERR, "%s: %m", pp->log_file);
 107                 open(_PATH_DEVNULL, O_WRONLY);
 108         }
 109
 110         if (chdir(pp->spool_dir) < 0)
 111                 frecverr("%s: chdir(%s): %s", pp->printer, pp->spool_dir,
 112                     strerror(errno));
 113         if (stat(pp->lock_file, &stb) == 0) {
 114                 if (stb.st_mode & 010) {
 115                         /* queue is disabled */
 116                         putchar('\1');          /* return error code */
 117                         exit(1);
 118                 }
 119         } else if (stat(pp->spool_dir, &stb) < 0)
 120                 frecverr("%s: stat(%s): %s", pp->printer, pp->spool_dir,
 121                     strerror(errno));
 122         minfree = 2 * read_number("minfree");   /* scale KB to 512 blocks */
 123         signal(SIGTERM, rcleanup);
 124         signal(SIGPIPE, rcleanup);
 125
 126         if (readjob(pp))
 127                 printjob(pp);
 128 }
 129
 130 /*
 131  * Read printer jobs sent by lpd and copy them to the spooling directory.
 132  * Return the number of jobs successfully transfered.
 133  */
 134 static int
 135 readjob(struct printer *pp)
 136 {
 137         int size;
 138         int cfcnt, dfcnt;
 139         char *cp, *clastp, *errmsg;
 140         char givenid[32], givenhost[MAXHOSTNAMELEN];
 141
 142         ack();
 143         cfcnt = 0;
 144         dfcnt = 0;
 145         for (;;) {
 146                 /*
 147                  * Read a command to tell us what to do
 148                  */
 149                 cp = line;
 150                 clastp = line + sizeof(line) - 1;
 151                 do {
 152                         size = read(STDOUT_FILENO, cp, (size_t)1);
 153                         if (size != (ssize_t)1) {
 154                                 if (size < (ssize_t)0) {
 155                                         frecverr("%s: lost connection",
 156                                             pp->printer);
 157                                         /*NOTREACHED*/
 158                                 }
 159                                 return (cfcnt);
 160                         }
 161                 } while ((*cp++ != '\n') && (cp <= clastp));
 162                 if (cp > clastp) {
 163                         frecverr("%s: readjob overflow", pp->printer);
 164                         /*NOTREACHED*/
 165                 }
 166                 *--cp = '\0';
 167                 cp = line;
 168                 switch (*cp++) {
 169                 case '\1':      /* cleanup because data sent was bad */
 170                         rcleanup(0);
 171                         continue;
 172
 173                 case '\2':      /* read cf file */
 174                         size = 0;
 175                         dfcnt = 0;
 176                         while (*cp >= '0' && *cp <= '9')
 177                                 size = size * 10 + (*cp++ - '0');
 178                         if (*cp++ != ' ')
 179                                 break;
 180                         /*
 181                          * host name has been authenticated, we use our
 182                          * view of the host name since we may be passed
 183                          * something different than what gethostbyaddr()
 184                          * returns
 185                          */
 186                         strlcpy(cp + 6, from_host, sizeof(line)
 187                             + (size_t)(line - cp - 6));
 188                         if (strchr(cp, '/')) {
 189                                 frecverr("readjob: %s: illegal path name", cp);
 190                                 /*NOTREACHED*/
 191                         }
 192                         strlcpy(tfname, cp, sizeof(tfname));
 193                         tfname[sizeof (tfname) - 1] = '\0';
 194                         tfname[0] = 't';
 195                         if (!chksize(size)) {
 196                                 write(STDOUT_FILENO, "\2", (size_t)1);
 197                                 continue;
 198                         }
 199                         if (!readfile(pp, tfname, (size_t)size)) {
 200                                 rcleanup(0);
 201                                 continue;
 202                         }
 203                         errmsg = ctl_renametf(pp->printer, tfname);
 204                         tfname[0] = '\0';
 205                         if (errmsg != NULL) {
 206                                 frecverr("%s: %s", pp->printer, errmsg);
 207                                 /*NOTREACHED*/
 208                         }
 209                         cfcnt++;
 210                         continue;
 211
 212                 case '\3':      /* read df file */
 213                         *givenid = '\0';
 214                         *givenhost = '\0';
 215                         size = 0;
 216                         while (*cp >= '0' && *cp <= '9')
 217                                 size = size * 10 + (*cp++ - '0');
 218                         if (*cp++ != ' ')
 219                                 break;
 220                         if (strchr(cp, '/')) {
 221                                 frecverr("readjob: %s: illegal path name", cp);
 222                                 /*NOTREACHED*/
 223                         }
 224                         if (!chksize(size)) {
 225                                 write(STDOUT_FILENO, "\2", (size_t)1);
 226                                 continue;
 227                         }
 228                         strlcpy(dfname, cp, sizeof(dfname));
 229                         dfcnt++;
 230                         trstat_init(pp, dfname, dfcnt);
 231                         readfile(pp, dfname, (size_t)size);
 232                         trstat_write(pp, TR_RECVING, (size_t)size, givenid,
 233                             from_host, givenhost);
 234                         continue;
 235                 }
 236                 frecverr("protocol screwup: %s", line);
 237                 /*NOTREACHED*/
 238         }
 239 }
 240
 241 /*
 242  * Read files send by lpd and copy them to the spooling directory.
 243  */
 244 static int
 245 readfile(struct printer *pp, char *file, size_t size)
 246 {
 247         char *cp;
 248         char buf[BUFSIZ];
 249         size_t amt, i;
 250         int err, fd, j;
 251
 252         fd = open(file, O_CREAT|O_EXCL|O_WRONLY, FILMOD);
 253         if (fd < 0) {
 254                 frecverr("%s: readfile: error on open(%s): %s",
 255                          pp->printer, file, strerror(errno));
 256                 /*NOTREACHED*/
 257         }
 258         ack();
 259         err = 0;
 260         for (i = 0; i < size; i += BUFSIZ) {
 261                 amt = BUFSIZ;
 262                 cp = buf;
 263                 if (i + amt > size)
 264                         amt = size - i;
 265                 do {
 266                         j = read(STDOUT_FILENO, cp, amt);
 267                         if (j <= 0) {
 268                                 frecverr("%s: lost connection", pp->printer);
 269                                 /*NOTREACHED*/
 270                         }
 271                         amt -= j;
 272                         cp += j;
 273                 } while (amt > 0);
 274                 amt = BUFSIZ;
 275                 if (i + amt > size)
 276                         amt = size - i;
 277                 if (write(fd, buf, amt) != (ssize_t)amt) {
 278                         err++;
 279                         break;
 280                 }
 281         }
 282         close(fd);
 283         if (err) {
 284                 frecverr("%s: write error on close(%s)", pp->printer, file);
 285                 /*NOTREACHED*/
 286         }
 287         if (noresponse()) {             /* file sent had bad data in it */
 288                 if (strchr(file, '/') == NULL)
 289                         unlink(file);
 290                 return (0);
 291         }
 292         ack();
 293         return (1);
 294 }
 295
 296 static int
 297 noresponse(void)
 298 {
 299         char resp;
 300
 301         if (read(STDOUT_FILENO, &resp, (size_t)1) != 1) {
 302                 frecverr("lost connection in noresponse()");
 303                 /*NOTREACHED*/
 304         }
 305         if (resp == '\0')
 306                 return(0);
 307         return(1);
 308 }
 309
 310 /*
 311  * Check to see if there is enough space on the disk for size bytes.
 312  * 1 == OK, 0 == Not OK.
 313  */
 314 static int
 315 chksize(int size)
 316 {
 317         int spacefree;
 318         struct statfs sfb;
 319
 320         if (statfs(".", &sfb) < 0) {
 321                 syslog(LOG_ERR, "%s: %m", "statfs(\".\")");
 322                 return (1);
 323         }
 324         spacefree = sfb.f_bavail * (sfb.f_bsize / 512);
 325         size = (size + 511) / 512;
 326         if (minfree + size > spacefree)
 327                 return(0);
 328         return(1);
 329 }
 330
 331 static int
 332 read_number(const char *fn)
 333 {
 334         char lin[80];
 335         FILE *fp;
 336
 337         if ((fp = fopen(fn, "r")) == NULL)
 338                 return (0);
 339         if (fgets(lin, 80, fp) == NULL) {
 340                 fclose(fp);
 341                 return (0);
 342         }
 343         fclose(fp);
 344         return (atoi(lin));
 345 }
 346
 347 /*
 348  * Remove all the files associated with the current job being transfered.
 349  */
 350 static void
 351 rcleanup(int signo __unused)
 352 {
 353         if (tfname[0] && strchr(tfname, '/') == NULL)
 354                 unlink(tfname);
 355         if (dfname[0] && strchr(dfname, '/') == NULL) {
 356                 do {
 357                         do
 358                                 unlink(dfname);
 359                         while (dfname[2]-- != 'A');
 360                         dfname[2] = 'z';
 361                 } while (dfname[0]-- != 'd');
 362         }
 363         dfname[0] = '\0';
 364 }
 365
 366 #include <stdarg.h>
 367
 368 static void
 369 frecverr(const char *msg, ...)
 370 {
 371         va_list ap;
 372         va_start(ap, msg);
 373         syslog(LOG_ERR, "Error receiving job from %s:", from_host);
 374         vsyslog(LOG_ERR, msg, ap);
 375         va_end(ap);
 376         /*
 377          * rcleanup is not called until AFTER logging the error message,
 378          * because rcleanup will zap some variables which may have been
 379          * supplied as parameters for that msg...
 380          */
 381         rcleanup(0);
 382         /*
 383          * Add a minimal delay before returning the final error code to
 384          * the sending host.  This just in case that machine responds
 385          * this error by INSTANTLY retrying (and instantly re-failing...).
 386          * It would be stupid of the sending host to do that, but if there
 387          * was a broken implementation which did it, the result might be
 388          * obscure performance problems and a flood of syslog messages on
 389          * the receiving host.
 390          */
 391         sleep(2);               /* a paranoid throttling measure */
 392         putchar('\1');          /* return error code */
 393         exit(1);
 394 }