lib-src/movemail.c

   1 /* movemail foo bar -- move file foo to file bar,
   2    locking file foo the way /bin/mail respects.
   3
   4 Copyright (C) 1986, 1992-1994, 1996, 1999, 2001-2013 Free Software
   5 Foundation, Inc.
   6
   7 This file is part of GNU Emacs.
   8
   9 GNU Emacs is free software: you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation, either version 3 of the License, or
  12 (at your option) any later version.
  13
  14 GNU Emacs is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22
  23 /* Important notice: defining MAIL_USE_FLOCK or MAIL_USE_LOCKF *will
  24    cause loss of mail* if you do it on a system that does not normally
  25    use flock/lockf as its way of interlocking access to inbox files.  The
  26    setting of MAIL_USE_FLOCK and MAIL_USE_LOCKF *must agree* with the
  27    system's own conventions.  It is not a choice that is up to you.
  28
  29    So, if your system uses lock files rather than flock, then the only way
  30    you can get proper operation is to enable movemail to write lockfiles there.
  31    This means you must either give that directory access modes
  32    that permit everyone to write lockfiles in it, or you must make movemail
  33    a setuid or setgid program.  */
  34
  35 /*
  36  * Modified January, 1986 by Michael R. Gretzinger (Project Athena)
  37  *
  38  * Added POP (Post Office Protocol) service.  When compiled -DMAIL_USE_POP
  39  * movemail will accept input filename arguments of the form
  40  * "po:username".  This will cause movemail to open a connection to
  41  * a pop server running on $MAILHOST (environment variable).  Movemail
  42  * must be setuid to root in order to work with POP.
  43  *
  44  * New module: popmail.c
  45  * Modified routines:
  46  *      main - added code within #ifdef MAIL_USE_POP; added setuid (getuid ())
  47  *              after POP code.
  48  * New routines in movemail.c:
  49  *      get_errmsg - return pointer to system error message
  50  *
  51  * Modified August, 1993 by Jonathan Kamens (OpenVision Technologies)
  52  *
  53  * Move all of the POP code into a separate file, "pop.c".
  54  * Use strerror instead of get_errmsg.
  55  *
  56  */
  57
  58 #include <config.h>
  59 #include <sys/types.h>
  60 #include <sys/stat.h>
  61 #include <sys/file.h>
  62 #include <stdio.h>
  63 #include <errno.h>
  64 #include <time.h>
  65
  66 #include <getopt.h>
  67 #include <unistd.h>
  68 #include <fcntl.h>
  69 #include <string.h>
  70 #include "syswait.h"
  71 #ifdef MAIL_USE_POP
  72 #include "pop.h"
  73 #endif
  74
  75 #ifdef MSDOS
  76 #undef access
  77 #endif /* MSDOS */
  78
  79 #ifdef WINDOWSNT
  80 #include "ntlib.h"
  81 #undef access
  82 #undef unlink
  83 #define fork() 0
  84 #define wait(var) (*(var) = 0)
  85 /* Unfortunately, Samba doesn't seem to properly lock Unix files even
  86    though the locking call succeeds (and indeed blocks local access from
  87    other NT programs).  If you have direct file access using an NFS
  88    client or something other than Samba, the locking call might work
  89    properly - make sure it does before you enable this!
  90
  91    [18-Feb-97 andrewi] I now believe my comment above to be incorrect,
  92    since it was based on a misunderstanding of how locking calls are
  93    implemented and used on Unix.  */
  94 //#define DISABLE_DIRECT_ACCESS
  95
  96 #include <fcntl.h>
  97 #endif /* WINDOWSNT */
  98
  99 #ifdef WINDOWSNT
 100 #include <sys/locking.h>
 101 #endif
 102
 103 /* If your system uses the `flock' or `lockf' system call for mail locking,
 104    define MAIL_USE_SYSTEM_LOCK.  If your system type should always define
 105    MAIL_USE_LOCKF or MAIL_USE_FLOCK but configure does not do this,
 106    please make a bug report.  */
 107
 108 #ifdef MAIL_USE_LOCKF
 109 #define MAIL_USE_SYSTEM_LOCK
 110 #endif
 111
 112 #ifdef MAIL_USE_FLOCK
 113 #define MAIL_USE_SYSTEM_LOCK
 114 #endif
 115
 116 #ifdef MAIL_USE_MMDF
 117 extern int lk_open (), lk_close ();
 118 #endif
 119
 120 #if !defined (MAIL_USE_SYSTEM_LOCK) && !defined (MAIL_USE_MMDF) && \
 121         (defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 122         defined (HAVE_MAILLOCK_H)
 123 #include <maillock.h>
 124 /* We can't use maillock unless we know what directory system mail
 125    files appear in. */
 126 #ifdef MAILDIR
 127 #define MAIL_USE_MAILLOCK
 128 static char *mail_spool_name (char *);
 129 #endif
 130 #endif
 131
 132 static _Noreturn void fatal (const char *s1, const char *s2, const char *s3);
 133 static void error (const char *s1, const char *s2, const char *s3);
 134 static _Noreturn void pfatal_with_name (char *name);
 135 static _Noreturn void pfatal_and_delete (char *name);
 136 #ifdef MAIL_USE_POP
 137 static int popmail (char *mailbox, char *outfile, int preserve, char *password, int reverse_order);
 138 static int pop_retr (popserver server, int msgno, FILE *arg);
 139 static int mbx_write (char *line, int len, FILE *mbf);
 140 static int mbx_delimit_begin (FILE *mbf);
 141 static int mbx_delimit_end (FILE *mbf);
 142 #endif
 143
 144 #if (defined MAIL_USE_MAILLOCK                                          \
 145      || (!defined DISABLE_DIRECT_ACCESS && !defined MAIL_USE_MMDF       \
 146          && !defined MAIL_USE_SYSTEM_LOCK))
 147 /* Like malloc but get fatal error if memory is exhausted.  */
 148
 149 static void *
 150 xmalloc (size_t size)
 151 {
 152   void *result = malloc (size);
 153   if (!result)
 154     fatal ("virtual memory exhausted", 0, 0);
 155   return result;
 156 }
 157 #endif
 158
 159 /* Nonzero means this is name of a lock file to delete on fatal error.  */
 160 static char *delete_lockname;
 161
 162 int
 163 main (int argc, char **argv)
 164 {
 165   char *inname, *outname;
 166   int indesc, outdesc;
 167   ssize_t nread;
 168   int wait_status;
 169   int c, preserve_mail = 0;
 170
 171 #ifndef MAIL_USE_SYSTEM_LOCK
 172   struct stat st;
 173   int tem;
 174   char *lockname;
 175   char *tempname;
 176   size_t inname_len, inname_dirlen;
 177   int desc;
 178 #endif /* not MAIL_USE_SYSTEM_LOCK */
 179
 180 #ifdef MAIL_USE_MAILLOCK
 181   char *spool_name;
 182 #endif
 183
 184 #ifdef MAIL_USE_POP
 185   int pop_reverse_order = 0;
 186 # define ARGSTR "pr"
 187 #else /* ! MAIL_USE_POP */
 188 # define ARGSTR "p"
 189 #endif /* MAIL_USE_POP */
 190
 191   uid_t real_gid = getgid ();
 192   uid_t priv_gid = getegid ();
 193
 194 #ifdef WINDOWSNT
 195   /* Ensure all file i/o is in binary mode. */
 196   _fmode = _O_BINARY;
 197 #endif
 198
 199   delete_lockname = 0;
 200
 201   while ((c = getopt (argc, argv, ARGSTR)) != EOF)
 202     {
 203       switch (c) {
 204 #ifdef MAIL_USE_POP
 205       case 'r':
 206         pop_reverse_order = 1;
 207         break;
 208 #endif
 209       case 'p':
 210         preserve_mail++;
 211         break;
 212       default:
 213         exit (EXIT_FAILURE);
 214       }
 215     }
 216
 217   if (
 218 #ifdef MAIL_USE_POP
 219       (argc - optind < 2) || (argc - optind > 3)
 220 #else
 221       (argc - optind != 2)
 222 #endif
 223       )
 224     {
 225 #ifdef MAIL_USE_POP
 226       fprintf (stderr, "Usage: movemail [-p] [-r] inbox destfile%s\n",
 227                " [POP-password]");
 228 #else
 229       fprintf (stderr, "Usage: movemail [-p] inbox destfile%s\n", "");
 230 #endif
 231       exit (EXIT_FAILURE);
 232     }
 233
 234   inname = argv[optind];
 235   outname = argv[optind+1];
 236
 237 #ifdef MAIL_USE_MMDF
 238   mmdf_init (argv[0]);
 239 #endif
 240
 241   if (*outname == 0)
 242     fatal ("Destination file name is empty", 0, 0);
 243
 244 #ifdef MAIL_USE_POP
 245   if (!strncmp (inname, "po:", 3))
 246     {
 247       int status;
 248
 249       status = popmail (inname + 3, outname, preserve_mail,
 250                         (argc - optind == 3) ? argv[optind+2] : NULL,
 251                         pop_reverse_order);
 252       exit (status);
 253     }
 254
 255   if (setuid (getuid ()) < 0)
 256     fatal ("Failed to drop privileges", 0, 0);
 257
 258 #endif /* MAIL_USE_POP */
 259
 260 #ifndef DISABLE_DIRECT_ACCESS
 261 #ifndef MAIL_USE_MMDF
 262 #ifndef MAIL_USE_SYSTEM_LOCK
 263 #ifdef MAIL_USE_MAILLOCK
 264   spool_name = mail_spool_name (inname);
 265   if (spool_name)
 266     {
 267 #ifdef lint
 268       lockname = 0;
 269 #endif
 270     }
 271   else
 272 #endif
 273     {
 274       /* Use a lock file named after our first argument with .lock appended:
 275          If it exists, the mail file is locked.  */
 276       /* Note: this locking mechanism is *required* by the mailer
 277          (on systems which use it) to prevent loss of mail.
 278
 279          On systems that use a lock file, extracting the mail without locking
 280          WILL occasionally cause loss of mail due to timing errors!
 281
 282          So, if creation of the lock file fails due to access
 283          permission on the mail spool directory, you simply MUST
 284          change the permission and/or make movemail a setgid program
 285          so it can create lock files properly.
 286
 287          You might also wish to verify that your system is one which
 288          uses lock files for this purpose.  Some systems use other methods.  */
 289
 290       inname_len = strlen (inname);
 291       lockname = xmalloc (inname_len + sizeof ".lock");
 292       strcpy (lockname, inname);
 293       strcpy (lockname + inname_len, ".lock");
 294       for (inname_dirlen = inname_len;
 295            inname_dirlen && !IS_DIRECTORY_SEP (inname[inname_dirlen - 1]);
 296            inname_dirlen--)
 297         continue;
 298       tempname = xmalloc (inname_dirlen + sizeof "EXXXXXX");
 299
 300       while (1)
 301         {
 302           /* Create the lock file, but not under the lock file name.  */
 303           /* Give up if cannot do that.  */
 304
 305           memcpy (tempname, inname, inname_dirlen);
 306           strcpy (tempname + inname_dirlen, "EXXXXXX");
 307 #ifdef HAVE_MKSTEMP
 308           desc = mkstemp (tempname);
 309 #else
 310           mktemp (tempname);
 311           if (!*tempname)
 312             desc = -1;
 313           else
 314             {
 315               unlink (tempname);
 316               desc = open (tempname, O_WRONLY | O_CREAT | O_EXCL, 0600);
 317             }
 318 #endif
 319           if (desc < 0)
 320             {
 321               int mkstemp_errno = errno;
 322               error ("error while creating what would become the lock file",
 323                      0, 0);
 324               errno = mkstemp_errno;
 325               pfatal_with_name (tempname);
 326             }
 327           close (desc);
 328
 329           tem = link (tempname, lockname);
 330
 331           if (tem < 0 && errno != EEXIST)
 332             pfatal_with_name (lockname);
 333
 334           unlink (tempname);
 335           if (tem >= 0)
 336             break;
 337           sleep (1);
 338
 339           /* If lock file is five minutes old, unlock it.
 340              Five minutes should be good enough to cope with crashes
 341              and wedgitude, and long enough to avoid being fooled
 342              by time differences between machines.  */
 343           if (stat (lockname, &st) >= 0)
 344             {
 345               time_t now = time (0);
 346               if (st.st_ctime < now - 300)
 347                 unlink (lockname);
 348             }
 349         }
 350
 351       delete_lockname = lockname;
 352     }
 353 #endif /* not MAIL_USE_SYSTEM_LOCK */
 354 #endif /* not MAIL_USE_MMDF */
 355
 356   if (fork () == 0)
 357     {
 358       int lockcount = 0;
 359       int status = 0;
 360 #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK)
 361       time_t touched_lock;
 362 # ifdef lint
 363       touched_lock = 0;
 364 # endif
 365 #endif
 366
 367       if (setuid (getuid ()) < 0 || setregid (-1, real_gid) < 0)
 368         fatal ("Failed to drop privileges", 0, 0);
 369
 370 #ifndef MAIL_USE_MMDF
 371 #ifdef MAIL_USE_SYSTEM_LOCK
 372       indesc = open (inname, O_RDWR);
 373 #else  /* if not MAIL_USE_SYSTEM_LOCK */
 374       indesc = open (inname, O_RDONLY);
 375 #endif /* not MAIL_USE_SYSTEM_LOCK */
 376 #else  /* MAIL_USE_MMDF */
 377       indesc = lk_open (inname, O_RDONLY, 0, 0, 10);
 378 #endif /* MAIL_USE_MMDF */
 379
 380       if (indesc < 0)
 381         pfatal_with_name (inname);
 382
 383       /* Make sure the user can read the output file.  */
 384       umask (umask (0) & 0377);
 385
 386       outdesc = open (outname, O_WRONLY | O_CREAT | O_EXCL, 0666);
 387       if (outdesc < 0)
 388         pfatal_with_name (outname);
 389
 390       if (setregid (-1, priv_gid) < 0)
 391         fatal ("Failed to regain privileges", 0, 0);
 392
 393       /* This label exists so we can retry locking
 394          after a delay, if it got EAGAIN or EBUSY.  */
 395     retry_lock:
 396
 397       /* Try to lock it.  */
 398 #ifdef MAIL_USE_MAILLOCK
 399       if (spool_name)
 400         {
 401           /* The "0 - " is to make it a negative number if maillock returns
 402              non-zero. */
 403           status = 0 - maillock (spool_name, 1);
 404 #ifdef HAVE_TOUCHLOCK
 405           touched_lock = time (0);
 406 #endif
 407           lockcount = 5;
 408         }
 409       else
 410 #endif /* MAIL_USE_MAILLOCK */
 411         {
 412 #ifdef MAIL_USE_SYSTEM_LOCK
 413 #ifdef MAIL_USE_LOCKF
 414           status = lockf (indesc, F_LOCK, 0);
 415 #else /* not MAIL_USE_LOCKF */
 416 #ifdef WINDOWSNT
 417           status = locking (indesc, LK_RLCK, -1L);
 418 #else
 419           status = flock (indesc, LOCK_EX);
 420 #endif
 421 #endif /* not MAIL_USE_LOCKF */
 422 #endif /* MAIL_USE_SYSTEM_LOCK */
 423         }
 424
 425       /* If it fails, retry up to 5 times
 426          for certain failure codes.  */
 427       if (status < 0)
 428         {
 429           if (++lockcount <= 5 && (errno == EAGAIN || errno == EBUSY))
 430             {
 431               sleep (1);
 432               goto retry_lock;
 433             }
 434
 435           pfatal_with_name (inname);
 436         }
 437
 438       {
 439         char buf[1024];
 440
 441         while (1)
 442           {
 443             nread = read (indesc, buf, sizeof buf);
 444             if (nread < 0)
 445               pfatal_with_name (inname);
 446             if (nread != write (outdesc, buf, nread))
 447               {
 448                 int saved_errno = errno;
 449                 unlink (outname);
 450                 errno = saved_errno;
 451                 pfatal_with_name (outname);
 452               }
 453             if (nread < sizeof buf)
 454               break;
 455 #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK)
 456             if (spool_name)
 457               {
 458                 time_t now = time (0);
 459                 if (now - touched_lock > 60)
 460                   {
 461                     touchlock ();
 462                     touched_lock = now;
 463                   }
 464               }
 465 #endif /* MAIL_USE_MAILLOCK */
 466           }
 467       }
 468
 469       if (fsync (outdesc) != 0 && errno != EINVAL)
 470         pfatal_and_delete (outname);
 471
 472       /* Prevent symlink attacks truncating other users' mailboxes */
 473       if (setregid (-1, real_gid) < 0)
 474         fatal ("Failed to drop privileges", 0, 0);
 475
 476       /* Check to make sure no errors before we zap the inbox.  */
 477       if (close (outdesc) != 0)
 478         pfatal_and_delete (outname);
 479
 480 #ifdef MAIL_USE_SYSTEM_LOCK
 481       if (! preserve_mail)
 482         {
 483           if (ftruncate (indesc, 0L) != 0)
 484             pfatal_with_name (inname);
 485         }
 486 #endif /* MAIL_USE_SYSTEM_LOCK */
 487
 488 #ifdef MAIL_USE_MMDF
 489       lk_close (indesc, 0, 0, 0);
 490 #else
 491       close (indesc);
 492 #endif
 493
 494 #ifndef MAIL_USE_SYSTEM_LOCK
 495       if (! preserve_mail)
 496         {
 497           /* Delete the input file; if we can't, at least get rid of its
 498              contents.  */
 499 #ifdef MAIL_UNLINK_SPOOL
 500           /* This is generally bad to do, because it destroys the permissions
 501              that were set on the file.  Better to just empty the file.  */
 502           if (unlink (inname) < 0 && errno != ENOENT)
 503 #endif /* MAIL_UNLINK_SPOOL */
 504             creat (inname, 0600);
 505         }
 506 #endif /* not MAIL_USE_SYSTEM_LOCK */
 507
 508       /* End of mailbox truncation */
 509       if (setregid (-1, priv_gid) < 0)
 510         fatal ("Failed to regain privileges", 0, 0);
 511
 512 #ifdef MAIL_USE_MAILLOCK
 513       /* This has to occur in the child, i.e., in the process that
 514          acquired the lock! */
 515       if (spool_name)
 516         mailunlock ();
 517 #endif
 518       exit (EXIT_SUCCESS);
 519     }
 520
 521   wait (&wait_status);
 522   if (!WIFEXITED (wait_status))
 523     exit (EXIT_FAILURE);
 524   else if (WEXITSTATUS (wait_status) != 0)
 525     exit (WEXITSTATUS (wait_status));
 526
 527 #if !defined (MAIL_USE_MMDF) && !defined (MAIL_USE_SYSTEM_LOCK)
 528 #ifdef MAIL_USE_MAILLOCK
 529   if (! spool_name)
 530 #endif /* MAIL_USE_MAILLOCK */
 531     unlink (lockname);
 532 #endif /* not MAIL_USE_MMDF and not MAIL_USE_SYSTEM_LOCK */
 533
 534 #endif /* ! DISABLE_DIRECT_ACCESS */
 535
 536   return EXIT_SUCCESS;
 537 }
 538
 539 #ifdef MAIL_USE_MAILLOCK
 540 /* This function uses stat to confirm that the mail directory is
 541    identical to the directory of the input file, rather than just
 542    string-comparing the two paths, because one or both of them might
 543    be symbolic links pointing to some other directory. */
 544 static char *
 545 mail_spool_name (char *inname)
 546 {
 547   struct stat stat1, stat2;
 548   char *indir, *fname;
 549   int status;
 550
 551   if (! (fname = strrchr (inname, '/')))
 552     return NULL;
 553
 554   fname++;
 555
 556   if (stat (MAILDIR, &stat1) < 0)
 557     return NULL;
 558
 559   indir = xmalloc (fname - inname + 1);
 560   memcpy (indir, inname, fname - inname);
 561   indir[fname-inname] = '\0';
 562
 563
 564   status = stat (indir, &stat2);
 565
 566   free (indir);
 567
 568   if (status < 0)
 569     return NULL;
 570
 571   if (stat1.st_dev == stat2.st_dev
 572       && stat1.st_ino == stat2.st_ino)
 573     return fname;
 574
 575   return NULL;
 576 }
 577 #endif /* MAIL_USE_MAILLOCK */
 578 \f
 579 /* Print error message and exit.  */
 580
 581 static void
 582 fatal (const char *s1, const char *s2, const char *s3)
 583 {
 584   if (delete_lockname)
 585     unlink (delete_lockname);
 586   error (s1, s2, s3);
 587   exit (EXIT_FAILURE);
 588 }
 589
 590 /* Print error message.  `s1' is printf control string, `s2' and `s3'
 591    are args for it or null. */
 592
 593 static void
 594 error (const char *s1, const char *s2, const char *s3)
 595 {
 596   fprintf (stderr, "movemail: ");
 597   if (s3)
 598     fprintf (stderr, s1, s2, s3);
 599   else if (s2)
 600     fprintf (stderr, s1, s2);
 601   else
 602     fprintf (stderr, "%s", s1);
 603   fprintf (stderr, "\n");
 604 }
 605
 606 static void
 607 pfatal_with_name (char *name)
 608 {
 609   fatal ("%s for %s", strerror (errno), name);
 610 }
 611
 612 static void
 613 pfatal_and_delete (char *name)
 614 {
 615   char *s = strerror (errno);
 616   unlink (name);
 617   fatal ("%s for %s", s, name);
 618 }
 619 \f
 620 /* This is the guts of the interface to the Post Office Protocol.  */
 621
 622 #ifdef MAIL_USE_POP
 623
 624 #ifndef WINDOWSNT
 625 #include <sys/socket.h>
 626 #include <netinet/in.h>
 627 #include <netdb.h>
 628 #else
 629 #undef _WINSOCKAPI_
 630 #include <winsock.h>
 631 #endif
 632 #include <pwd.h>
 633 #include <string.h>
 634
 635 #define NOTOK (-1)
 636 #define OK 0
 637
 638 static char Errmsg[200];        /* POP errors, at least, can exceed
 639                                    the original length of 80.  */
 640
 641 /*
 642  * The full valid syntax for a POP mailbox specification for movemail
 643  * is "po:username:hostname".  The ":hostname" is optional; if it is
 644  * omitted, the MAILHOST environment variable will be consulted.  Note
 645  * that by the time popmail() is called the "po:" has been stripped
 646  * off of the front of the mailbox name.
 647  *
 648  * If the mailbox is in the form "po:username:hostname", then it is
 649  * modified by this function -- the second colon is replaced by a
 650  * null.
 651  *
 652  * Return a value suitable for passing to `exit'.
 653  */
 654
 655 static int
 656 popmail (char *mailbox, char *outfile, int preserve, char *password, int reverse_order)
 657 {
 658   int nmsgs, nbytes;
 659   register int i;
 660   int mbfi;
 661   FILE *mbf;
 662   popserver server;
 663   int start, end, increment;
 664   char *user, *hostname;
 665
 666   user = mailbox;
 667   if ((hostname = strchr (mailbox, ':')))
 668     *hostname++ = '\0';
 669
 670   server = pop_open (hostname, user, password, POP_NO_GETPASS);
 671   if (! server)
 672     {
 673       error ("Error connecting to POP server: %s", pop_error, 0);
 674       return EXIT_FAILURE;
 675     }
 676
 677   if (pop_stat (server, &nmsgs, &nbytes))
 678     {
 679       error ("Error getting message count from POP server: %s", pop_error, 0);
 680       return EXIT_FAILURE;
 681     }
 682
 683   if (!nmsgs)
 684     {
 685       pop_close (server);
 686       return EXIT_SUCCESS;
 687     }
 688
 689   mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
 690   if (mbfi < 0)
 691     {
 692       pop_close (server);
 693       error ("Error in open: %s, %s", strerror (errno), outfile);
 694       return EXIT_FAILURE;
 695     }
 696
 697   if (fchown (mbfi, getuid (), -1) != 0)
 698     {
 699       int fchown_errno = errno;
 700       struct stat st;
 701       if (fstat (mbfi, &st) != 0 || st.st_uid != getuid ())
 702         {
 703           pop_close (server);
 704           error ("Error in fchown: %s, %s", strerror (fchown_errno), outfile);
 705           return EXIT_FAILURE;
 706         }
 707     }
 708
 709   if ((mbf = fdopen (mbfi, "wb")) == NULL)
 710     {
 711       pop_close (server);
 712       error ("Error in fdopen: %s", strerror (errno), 0);
 713       close (mbfi);
 714       unlink (outfile);
 715       return EXIT_FAILURE;
 716     }
 717
 718   if (reverse_order)
 719     {
 720       start = nmsgs;
 721       end = 1;
 722       increment = -1;
 723     }
 724   else
 725     {
 726       start = 1;
 727       end = nmsgs;
 728       increment = 1;
 729     }
 730
 731   for (i = start; i * increment <= end * increment; i += increment)
 732     {
 733       mbx_delimit_begin (mbf);
 734       if (pop_retr (server, i, mbf) != OK)
 735         {
 736           error ("%s", Errmsg, 0);
 737           close (mbfi);
 738           return EXIT_FAILURE;
 739         }
 740       mbx_delimit_end (mbf);
 741       fflush (mbf);
 742       if (ferror (mbf))
 743         {
 744           error ("Error in fflush: %s", strerror (errno), 0);
 745           pop_close (server);
 746           close (mbfi);
 747           return EXIT_FAILURE;
 748         }
 749     }
 750
 751   if (fsync (mbfi) != 0 && errno != EINVAL)
 752     {
 753       error ("Error in fsync: %s", strerror (errno), 0);
 754       close (mbfi);
 755       return EXIT_FAILURE;
 756     }
 757
 758   if (close (mbfi) != 0)
 759     {
 760       error ("Error in close: %s", strerror (errno), 0);
 761       return EXIT_FAILURE;
 762     }
 763
 764   if (! preserve)
 765     for (i = 1; i <= nmsgs; i++)
 766       {
 767         if (pop_delete (server, i))
 768           {
 769             error ("Error from POP server: %s", pop_error, 0);
 770             pop_close (server);
 771             return EXIT_FAILURE;
 772           }
 773       }
 774
 775   if (pop_quit (server))
 776     {
 777       error ("Error from POP server: %s", pop_error, 0);
 778       return EXIT_FAILURE;
 779     }
 780
 781   return EXIT_SUCCESS;
 782 }
 783
 784 static int
 785 pop_retr (popserver server, int msgno, FILE *arg)
 786 {
 787   char *line;
 788   int ret;
 789
 790   if (pop_retrieve_first (server, msgno, &line))
 791     {
 792       snprintf (Errmsg, sizeof Errmsg, "Error from POP server: %s", pop_error);
 793       return (NOTOK);
 794     }
 795
 796   while ((ret = pop_retrieve_next (server, &line)) >= 0)
 797     {
 798       if (! line)
 799         break;
 800
 801       if (mbx_write (line, ret, arg) != OK)
 802         {
 803           strcpy (Errmsg, strerror (errno));
 804           pop_close (server);
 805           return (NOTOK);
 806         }
 807     }
 808
 809   if (ret)
 810     {
 811       snprintf (Errmsg, sizeof Errmsg, "Error from POP server: %s", pop_error);
 812       return (NOTOK);
 813     }
 814
 815   return (OK);
 816 }
 817
 818 static int
 819 mbx_write (char *line, int len, FILE *mbf)
 820 {
 821 #ifdef MOVEMAIL_QUOTE_POP_FROM_LINES
 822   /* Do this as a macro instead of using strcmp to save on execution time. */
 823   # define IS_FROM_LINE(a) ((a[0] == 'F')       \
 824                             && (a[1] == 'r')    \
 825                             && (a[2] == 'o')    \
 826                             && (a[3] == 'm')    \
 827                             && (a[4] == ' '))
 828   if (IS_FROM_LINE (line))
 829     {
 830       if (fputc ('>', mbf) == EOF)
 831         return (NOTOK);
 832     }
 833 #endif
 834   if (line[0] == '\037')
 835     {
 836       if (fputs ("^_", mbf) == EOF)
 837         return (NOTOK);
 838       line++;
 839       len--;
 840     }
 841   if (fwrite (line, 1, len, mbf) != len)
 842     return (NOTOK);
 843   if (fputc (0x0a, mbf) == EOF)
 844     return (NOTOK);
 845   return (OK);
 846 }
 847
 848 static int
 849 mbx_delimit_begin (FILE *mbf)
 850 {
 851   time_t now;
 852   struct tm *ltime;
 853   char fromline[40] = "From movemail ";
 854
 855   now = time (NULL);
 856   ltime = localtime (&now);
 857
 858   strcat (fromline, asctime (ltime));
 859
 860   if (fputs (fromline, mbf) == EOF)
 861     return (NOTOK);
 862   return (OK);
 863 }
 864
 865 static int
 866 mbx_delimit_end (FILE *mbf)
 867 {
 868   if (putc ('\n', mbf) == EOF)
 869     return (NOTOK);
 870   return (OK);
 871 }
 872
 873 #endif /* MAIL_USE_POP */