lib-src/movemail.c

   1 /* movemail foo bar -- move file foo to file bar,
   2    locking file foo the way /bin/mail respects.
   3    Copyright (C) 1986, 1992, 1993, 1994, 1996, 1999, 2001, 2002, 2003, 2004,
   4                  2005, 2006, 2007, 2008  Free Software Foundation, Inc.
   5
   6 This file is part of GNU Emacs.
   7
   8 GNU Emacs is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 3, or (at your option)
  11 any later version.
  12
  13 GNU Emacs is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU Emacs; see the file COPYING.  If not, write to
  20 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21 Boston, MA 02110-1301, USA.  */
  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 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 #define NO_SHORTNAMES   /* Tell config not to load remap.h */
  59 #include <config.h>
  60 #include <sys/types.h>
  61 #include <sys/stat.h>
  62 #include <sys/file.h>
  63 #include <stdio.h>
  64 #include <errno.h>
  65
  66 #include <getopt.h>
  67 #ifdef HAVE_UNISTD_H
  68 #include <unistd.h>
  69 #endif
  70 #ifdef HAVE_FCNTL_H
  71 #include <fcntl.h>
  72 #endif
  73 #include "syswait.h"
  74 #ifdef MAIL_USE_POP
  75 #include "pop.h"
  76 #endif
  77
  78 #ifdef MSDOS
  79 #undef access
  80 #endif /* MSDOS */
  81
  82 #ifndef DIRECTORY_SEP
  83 #define DIRECTORY_SEP '/'
  84 #endif
  85 #ifndef IS_DIRECTORY_SEP
  86 #define IS_DIRECTORY_SEP(_c_) ((_c_) == DIRECTORY_SEP)
  87 #endif
  88
  89 #ifdef WINDOWSNT
  90 #include "ntlib.h"
  91 #undef access
  92 #undef unlink
  93 #define fork() 0
  94 #define wait(var) (*(var) = 0)
  95 /* Unfortunately, Samba doesn't seem to properly lock Unix files even
  96    though the locking call succeeds (and indeed blocks local access from
  97    other NT programs).  If you have direct file access using an NFS
  98    client or something other than Samba, the locking call might work
  99    properly - make sure it does before you enable this!
 100
 101    [18-Feb-97 andrewi] I now believe my comment above to be incorrect,
 102    since it was based on a misunderstanding of how locking calls are
 103    implemented and used on Unix.  */
 104 //#define DISABLE_DIRECT_ACCESS
 105
 106 #include <fcntl.h>
 107 #endif /* WINDOWSNT */
 108
 109 #ifndef F_OK
 110 #define F_OK 0
 111 #define X_OK 1
 112 #define W_OK 2
 113 #define R_OK 4
 114 #endif
 115
 116 #ifdef WINDOWSNT
 117 #include <sys/locking.h>
 118 #endif
 119
 120 #ifdef MAIL_USE_LOCKF
 121 #define MAIL_USE_SYSTEM_LOCK
 122 #endif
 123
 124 #ifdef MAIL_USE_FLOCK
 125 #define MAIL_USE_SYSTEM_LOCK
 126 #endif
 127
 128 #ifdef MAIL_USE_MMDF
 129 extern int lk_open (), lk_close ();
 130 #endif
 131
 132 #if !defined (MAIL_USE_SYSTEM_LOCK) && !defined (MAIL_USE_MMDF) && \
 133         (defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 134         defined (HAVE_MAILLOCK_H)
 135 #include <maillock.h>
 136 /* We can't use maillock unless we know what directory system mail
 137    files appear in. */
 138 #ifdef MAILDIR
 139 #define MAIL_USE_MAILLOCK
 140 static char *mail_spool_name ();
 141 #endif
 142 #endif
 143
 144 #ifndef errno
 145 extern int errno;
 146 #endif
 147 char *strerror ();
 148 #ifdef HAVE_INDEX
 149 extern char *index __P ((const char *, int));
 150 #endif
 151 #ifdef HAVE_RINDEX
 152 extern char *rindex __P((const char *, int));
 153 #endif
 154
 155 void fatal ();
 156 void error ();
 157 void pfatal_with_name ();
 158 void pfatal_and_delete ();
 159 char *concat ();
 160 long *xmalloc ();
 161 int popmail ();
 162 int pop_retr ();
 163 int mbx_write ();
 164 int mbx_delimit_begin ();
 165 int mbx_delimit_end ();
 166
 167 /* Nonzero means this is name of a lock file to delete on fatal error.  */
 168 char *delete_lockname;
 169
 170 int
 171 main (argc, argv)
 172      int argc;
 173      char **argv;
 174 {
 175   char *inname, *outname;
 176   int indesc, outdesc;
 177   int nread;
 178   WAITTYPE status;
 179   int c, preserve_mail = 0;
 180
 181 #ifndef MAIL_USE_SYSTEM_LOCK
 182   struct stat st;
 183   long now;
 184   int tem;
 185   char *lockname, *p;
 186   char *tempname;
 187   int desc;
 188 #endif /* not MAIL_USE_SYSTEM_LOCK */
 189
 190 #ifdef MAIL_USE_MAILLOCK
 191   char *spool_name;
 192 #endif
 193
 194 #ifdef MAIL_USE_POP
 195   int pop_reverse_order = 0;
 196 # define ARGSTR "pr"
 197 #else /* ! MAIL_USE_POP */
 198 # define ARGSTR "p"
 199 #endif /* MAIL_USE_POP */
 200
 201 #ifdef WINDOWSNT
 202   /* Ensure all file i/o is in binary mode. */
 203   _fmode = _O_BINARY;
 204 #endif
 205
 206   delete_lockname = 0;
 207
 208   while ((c = getopt (argc, argv, ARGSTR)) != EOF)
 209     {
 210       switch (c) {
 211 #ifdef MAIL_USE_POP
 212       case 'r':
 213         pop_reverse_order = 1;
 214         break;
 215 #endif
 216       case 'p':
 217         preserve_mail++;
 218         break;
 219       default:
 220         exit (EXIT_FAILURE);
 221       }
 222     }
 223
 224   if (
 225 #ifdef MAIL_USE_POP
 226       (argc - optind < 2) || (argc - optind > 3)
 227 #else
 228       (argc - optind != 2)
 229 #endif
 230       )
 231     {
 232 #ifdef MAIL_USE_POP
 233       fprintf (stderr, "Usage: movemail [-p] inbox destfile%s\n",
 234                " [POP-password]");
 235 #else
 236       fprintf (stderr, "Usage: movemail [-p] inbox destfile%s\n", "");
 237 #endif
 238       exit (EXIT_FAILURE);
 239     }
 240
 241   inname = argv[optind];
 242   outname = argv[optind+1];
 243
 244 #ifdef MAIL_USE_MMDF
 245   mmdf_init (argv[0]);
 246 #endif
 247
 248   if (*outname == 0)
 249     fatal ("Destination file name is empty", 0, 0);
 250
 251   /* Check access to output file.  */
 252   if (access (outname, F_OK) == 0 && access (outname, W_OK) != 0)
 253     pfatal_with_name (outname);
 254
 255   /* Also check that outname's directory is writable to the real uid.  */
 256   {
 257     char *buf = (char *) xmalloc (strlen (outname) + 1);
 258     char *p;
 259     strcpy (buf, outname);
 260     p = buf + strlen (buf);
 261     while (p > buf && !IS_DIRECTORY_SEP (p[-1]))
 262       *--p = 0;
 263     if (p == buf)
 264       *p++ = '.';
 265     if (access (buf, W_OK) != 0)
 266       pfatal_with_name (buf);
 267     free (buf);
 268   }
 269
 270 #ifdef MAIL_USE_POP
 271   if (!strncmp (inname, "po:", 3))
 272     {
 273       int status;
 274
 275       status = popmail (inname + 3, outname, preserve_mail,
 276                         (argc - optind == 3) ? argv[optind+2] : NULL,
 277                         pop_reverse_order);
 278       exit (status);
 279     }
 280
 281   setuid (getuid ());
 282 #endif /* MAIL_USE_POP */
 283
 284 #ifndef DISABLE_DIRECT_ACCESS
 285
 286   /* Check access to input file.  */
 287   if (access (inname, R_OK | W_OK) != 0)
 288     pfatal_with_name (inname);
 289
 290 #ifndef MAIL_USE_MMDF
 291 #ifndef MAIL_USE_SYSTEM_LOCK
 292 #ifdef MAIL_USE_MAILLOCK
 293   spool_name = mail_spool_name (inname);
 294   if (! spool_name)
 295 #endif
 296     {
 297       /* Use a lock file named after our first argument with .lock appended:
 298          If it exists, the mail file is locked.  */
 299       /* Note: this locking mechanism is *required* by the mailer
 300          (on systems which use it) to prevent loss of mail.
 301
 302          On systems that use a lock file, extracting the mail without locking
 303          WILL occasionally cause loss of mail due to timing errors!
 304
 305          So, if creation of the lock file fails
 306          due to access permission on the mail spool directory,
 307          you simply MUST change the permission
 308          and/or make movemail a setgid program
 309          so it can create lock files properly.
 310
 311          You might also wish to verify that your system is one
 312          which uses lock files for this purpose.  Some systems use other methods.
 313
 314          If your system uses the `flock' system call for mail locking,
 315          define MAIL_USE_SYSTEM_LOCK in config.h or the s-*.h file
 316          and recompile movemail.  If the s- file for your system
 317          should define MAIL_USE_SYSTEM_LOCK but does not, send a bug report
 318          to bug-gnu-emacs@prep.ai.mit.edu so we can fix it.  */
 319
 320       lockname = concat (inname, ".lock", "");
 321       tempname = (char *) xmalloc (strlen (inname) + strlen ("EXXXXXX") + 1);
 322       strcpy (tempname, inname);
 323       p = tempname + strlen (tempname);
 324       while (p != tempname && !IS_DIRECTORY_SEP (p[-1]))
 325         p--;
 326       *p = 0;
 327       strcpy (p, "EXXXXXX");
 328       mktemp (tempname);
 329       unlink (tempname);
 330
 331       while (1)
 332         {
 333           /* Create the lock file, but not under the lock file name.  */
 334           /* Give up if cannot do that.  */
 335           desc = open (tempname, O_WRONLY | O_CREAT | O_EXCL, 0666);
 336           if (desc < 0)
 337             {
 338               char *message = (char *) xmalloc (strlen (tempname) + 50);
 339               sprintf (message, "creating %s, which would become the lock file",
 340                        tempname);
 341               pfatal_with_name (message);
 342             }
 343           close (desc);
 344
 345           tem = link (tempname, lockname);
 346           unlink (tempname);
 347           if (tem >= 0)
 348             break;
 349           sleep (1);
 350
 351           /* If lock file is five minutes old, unlock it.
 352              Five minutes should be good enough to cope with crashes
 353              and wedgitude, and long enough to avoid being fooled
 354              by time differences between machines.  */
 355           if (stat (lockname, &st) >= 0)
 356             {
 357               now = time (0);
 358               if (st.st_ctime < now - 300)
 359                 unlink (lockname);
 360             }
 361         }
 362
 363       delete_lockname = lockname;
 364     }
 365 #endif /* not MAIL_USE_SYSTEM_LOCK */
 366 #endif /* not MAIL_USE_MMDF */
 367
 368   if (fork () == 0)
 369     {
 370       int lockcount = 0;
 371       int status = 0;
 372 #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK)
 373       long touched_lock, now;
 374 #endif
 375
 376       setuid (getuid ());
 377
 378 #ifndef MAIL_USE_MMDF
 379 #ifdef MAIL_USE_SYSTEM_LOCK
 380       indesc = open (inname, O_RDWR);
 381 #else  /* if not MAIL_USE_SYSTEM_LOCK */
 382       indesc = open (inname, O_RDONLY);
 383 #endif /* not MAIL_USE_SYSTEM_LOCK */
 384 #else  /* MAIL_USE_MMDF */
 385       indesc = lk_open (inname, O_RDONLY, 0, 0, 10);
 386 #endif /* MAIL_USE_MMDF */
 387
 388       if (indesc < 0)
 389         pfatal_with_name (inname);
 390
 391 #ifdef BSD_SYSTEM
 392       /* In case movemail is setuid to root, make sure the user can
 393          read the output file.  */
 394       /* This is desirable for all systems
 395          but I don't want to assume all have the umask system call */
 396       umask (umask (0) & 0333);
 397 #endif /* BSD_SYSTEM */
 398       outdesc = open (outname, O_WRONLY | O_CREAT | O_EXCL, 0666);
 399       if (outdesc < 0)
 400         pfatal_with_name (outname);
 401
 402       /* This label exists so we can retry locking
 403          after a delay, if it got EAGAIN or EBUSY.  */
 404     retry_lock:
 405
 406       /* Try to lock it.  */
 407 #ifdef MAIL_USE_MAILLOCK
 408       if (spool_name)
 409         {
 410           /* The "0 - " is to make it a negative number if maillock returns
 411              non-zero. */
 412           status = 0 - maillock (spool_name, 1);
 413 #ifdef HAVE_TOUCHLOCK
 414           touched_lock = time (0);
 415 #endif
 416           lockcount = 5;
 417         }
 418       else
 419 #endif /* MAIL_USE_MAILLOCK */
 420         {
 421 #ifdef MAIL_USE_SYSTEM_LOCK
 422 #ifdef MAIL_USE_LOCKF
 423           status = lockf (indesc, F_LOCK, 0);
 424 #else /* not MAIL_USE_LOCKF */
 425 #ifdef WINDOWSNT
 426           status = locking (indesc, LK_RLCK, -1L);
 427 #else
 428           status = flock (indesc, LOCK_EX);
 429 #endif
 430 #endif /* not MAIL_USE_LOCKF */
 431 #endif /* MAIL_USE_SYSTEM_LOCK */
 432         }
 433
 434       /* If it fails, retry up to 5 times
 435          for certain failure codes.  */
 436       if (status < 0)
 437         {
 438           if (++lockcount <= 5)
 439             {
 440 #ifdef EAGAIN
 441               if (errno == EAGAIN)
 442                 {
 443                   sleep (1);
 444                   goto retry_lock;
 445                 }
 446 #endif
 447 #ifdef EBUSY
 448               if (errno == EBUSY)
 449                 {
 450                   sleep (1);
 451                   goto retry_lock;
 452                 }
 453 #endif
 454             }
 455
 456           pfatal_with_name (inname);
 457         }
 458
 459       {
 460         char buf[1024];
 461
 462         while (1)
 463           {
 464             nread = read (indesc, buf, sizeof buf);
 465             if (nread < 0)
 466               pfatal_with_name (inname);
 467             if (nread != write (outdesc, buf, nread))
 468               {
 469                 int saved_errno = errno;
 470                 unlink (outname);
 471                 errno = saved_errno;
 472                 pfatal_with_name (outname);
 473               }
 474             if (nread < sizeof buf)
 475               break;
 476 #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK)
 477             if (spool_name)
 478               {
 479                 now = time (0);
 480                 if (now - touched_lock > 60)
 481                   {
 482                     touchlock ();
 483                     touched_lock = now;
 484                   }
 485               }
 486 #endif /* MAIL_USE_MAILLOCK */
 487           }
 488       }
 489
 490 #ifdef BSD_SYSTEM
 491       if (fsync (outdesc) < 0)
 492         pfatal_and_delete (outname);
 493 #endif
 494
 495       /* Check to make sure no errors before we zap the inbox.  */
 496       if (close (outdesc) != 0)
 497         pfatal_and_delete (outname);
 498
 499 #ifdef MAIL_USE_SYSTEM_LOCK
 500       if (! preserve_mail)
 501         {
 502           ftruncate (indesc, 0L);
 503         }
 504 #endif /* MAIL_USE_SYSTEM_LOCK */
 505
 506 #ifdef MAIL_USE_MMDF
 507       lk_close (indesc, 0, 0, 0);
 508 #else
 509       close (indesc);
 510 #endif
 511
 512 #ifndef MAIL_USE_SYSTEM_LOCK
 513       if (! preserve_mail)
 514         {
 515           /* Delete the input file; if we can't, at least get rid of its
 516              contents.  */
 517 #ifdef MAIL_UNLINK_SPOOL
 518           /* This is generally bad to do, because it destroys the permissions
 519              that were set on the file.  Better to just empty the file.  */
 520           if (unlink (inname) < 0 && errno != ENOENT)
 521 #endif /* MAIL_UNLINK_SPOOL */
 522             creat (inname, 0600);
 523         }
 524 #endif /* not MAIL_USE_SYSTEM_LOCK */
 525
 526 #ifdef MAIL_USE_MAILLOCK
 527       /* This has to occur in the child, i.e., in the process that
 528          acquired the lock! */
 529       if (spool_name)
 530         mailunlock ();
 531 #endif
 532       exit (EXIT_SUCCESS);
 533     }
 534
 535   wait (&status);
 536   if (!WIFEXITED (status))
 537     exit (EXIT_FAILURE);
 538   else if (WRETCODE (status) != 0)
 539     exit (WRETCODE (status));
 540
 541 #if !defined (MAIL_USE_MMDF) && !defined (MAIL_USE_SYSTEM_LOCK)
 542 #ifdef MAIL_USE_MAILLOCK
 543   if (! spool_name)
 544 #endif /* MAIL_USE_MAILLOCK */
 545     unlink (lockname);
 546 #endif /* not MAIL_USE_MMDF and not MAIL_USE_SYSTEM_LOCK */
 547
 548 #endif /* ! DISABLE_DIRECT_ACCESS */
 549
 550   return EXIT_SUCCESS;
 551 }
 552
 553 #ifdef MAIL_USE_MAILLOCK
 554 /* This function uses stat to confirm that the mail directory is
 555    identical to the directory of the input file, rather than just
 556    string-comparing the two paths, because one or both of them might
 557    be symbolic links pointing to some other directory. */
 558 static char *
 559 mail_spool_name (inname)
 560      char *inname;
 561 {
 562   struct stat stat1, stat2;
 563   char *indir, *fname;
 564   int status;
 565
 566   if (! (fname = rindex (inname, '/')))
 567     return NULL;
 568
 569   fname++;
 570
 571   if (stat (MAILDIR, &stat1) < 0)
 572     return NULL;
 573
 574   indir = (char *) xmalloc (fname - inname + 1);
 575   strncpy (indir, inname, fname - inname);
 576   indir[fname-inname] = '\0';
 577
 578
 579   status = stat (indir, &stat2);
 580
 581   free (indir);
 582
 583   if (status < 0)
 584     return NULL;
 585
 586   if (stat1.st_dev == stat2.st_dev
 587       && stat1.st_ino == stat2.st_ino)
 588     return fname;
 589
 590   return NULL;
 591 }
 592 #endif /* MAIL_USE_MAILLOCK */
 593 \f
 594 /* Print error message and exit.  */
 595
 596 void
 597 fatal (s1, s2, s3)
 598      char *s1, *s2, *s3;
 599 {
 600   if (delete_lockname)
 601     unlink (delete_lockname);
 602   error (s1, s2, s3);
 603   exit (EXIT_FAILURE);
 604 }
 605
 606 /* Print error message.  `s1' is printf control string, `s2' and `s3'
 607    are args for it or null. */
 608
 609 void
 610 error (s1, s2, s3)
 611      char *s1, *s2, *s3;
 612 {
 613   fprintf (stderr, "movemail: ");
 614   if (s3)
 615     fprintf (stderr, s1, s2, s3);
 616   else if (s2)
 617     fprintf (stderr, s1, s2);
 618   else
 619     fprintf (stderr, s1);
 620   fprintf (stderr, "\n");
 621 }
 622
 623 void
 624 pfatal_with_name (name)
 625      char *name;
 626 {
 627   fatal ("%s for %s", strerror (errno), name);
 628 }
 629
 630 void
 631 pfatal_and_delete (name)
 632      char *name;
 633 {
 634   char *s = strerror (errno);
 635   unlink (name);
 636   fatal ("%s for %s", s, name);
 637 }
 638
 639 /* Return a newly-allocated string whose contents concatenate those of s1, s2, s3.  */
 640
 641 char *
 642 concat (s1, s2, s3)
 643      char *s1, *s2, *s3;
 644 {
 645   int len1 = strlen (s1), len2 = strlen (s2), len3 = strlen (s3);
 646   char *result = (char *) xmalloc (len1 + len2 + len3 + 1);
 647
 648   strcpy (result, s1);
 649   strcpy (result + len1, s2);
 650   strcpy (result + len1 + len2, s3);
 651   *(result + len1 + len2 + len3) = 0;
 652
 653   return result;
 654 }
 655
 656 /* Like malloc but get fatal error if memory is exhausted.  */
 657
 658 long *
 659 xmalloc (size)
 660      unsigned size;
 661 {
 662   long *result = (long *) malloc (size);
 663   if (!result)
 664     fatal ("virtual memory exhausted", 0, 0);
 665   return result;
 666 }
 667 \f
 668 /* This is the guts of the interface to the Post Office Protocol.  */
 669
 670 #ifdef MAIL_USE_POP
 671
 672 #ifndef WINDOWSNT
 673 #include <sys/socket.h>
 674 #include <netinet/in.h>
 675 #include <netdb.h>
 676 #else
 677 #undef _WINSOCKAPI_
 678 #include <winsock.h>
 679 #endif
 680 #include <pwd.h>
 681
 682 #define NOTOK (-1)
 683 #define OK 0
 684 #define DONE 1
 685
 686 char *progname;
 687 FILE *sfi;
 688 FILE *sfo;
 689 char ibuffer[BUFSIZ];
 690 char obuffer[BUFSIZ];
 691 char Errmsg[200];               /* POP errors, at least, can exceed
 692                                    the original length of 80.  */
 693
 694 /*
 695  * The full legal syntax for a POP mailbox specification for movemail
 696  * is "po:username:hostname".  The ":hostname" is optional; if it is
 697  * omitted, the MAILHOST environment variable will be consulted.  Note
 698  * that by the time popmail() is called the "po:" has been stripped
 699  * off of the front of the mailbox name.
 700  *
 701  * If the mailbox is in the form "po:username:hostname", then it is
 702  * modified by this function -- the second colon is replaced by a
 703  * null.
 704  *
 705  * Return a value suitable for passing to `exit'.
 706  */
 707
 708 int
 709 popmail (mailbox, outfile, preserve, password, reverse_order)
 710      char *mailbox;
 711      char *outfile;
 712      int preserve;
 713      char *password;
 714      int reverse_order;
 715 {
 716   int nmsgs, nbytes;
 717   register int i;
 718   int mbfi;
 719   FILE *mbf;
 720   char *getenv ();
 721   popserver server;
 722   int start, end, increment;
 723   char *user, *hostname;
 724
 725   user = mailbox;
 726   if ((hostname = index(mailbox, ':')))
 727     *hostname++ = '\0';
 728
 729   server = pop_open (hostname, user, password, POP_NO_GETPASS);
 730   if (! server)
 731     {
 732       error ("Error connecting to POP server: %s", pop_error, 0);
 733       return EXIT_FAILURE;
 734     }
 735
 736   if (pop_stat (server, &nmsgs, &nbytes))
 737     {
 738       error ("Error getting message count from POP server: %s", pop_error, 0);
 739       return EXIT_FAILURE;
 740     }
 741
 742   if (!nmsgs)
 743     {
 744       pop_close (server);
 745       return EXIT_SUCCESS;
 746     }
 747
 748   mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
 749   if (mbfi < 0)
 750     {
 751       pop_close (server);
 752       error ("Error in open: %s, %s", strerror (errno), outfile);
 753       return EXIT_FAILURE;
 754     }
 755   fchown (mbfi, getuid (), -1);
 756
 757   if ((mbf = fdopen (mbfi, "wb")) == NULL)
 758     {
 759       pop_close (server);
 760       error ("Error in fdopen: %s", strerror (errno), 0);
 761       close (mbfi);
 762       unlink (outfile);
 763       return EXIT_FAILURE;
 764     }
 765
 766   if (reverse_order)
 767     {
 768       start = nmsgs;
 769       end = 1;
 770       increment = -1;
 771     }
 772   else
 773     {
 774       start = 1;
 775       end = nmsgs;
 776       increment = 1;
 777     }
 778
 779   for (i = start; i * increment <= end * increment; i += increment)
 780     {
 781       mbx_delimit_begin (mbf);
 782       if (pop_retr (server, i, mbf) != OK)
 783         {
 784           error ("%s", Errmsg, 0);
 785           close (mbfi);
 786           return EXIT_FAILURE;
 787         }
 788       mbx_delimit_end (mbf);
 789       fflush (mbf);
 790       if (ferror (mbf))
 791         {
 792           error ("Error in fflush: %s", strerror (errno), 0);
 793           pop_close (server);
 794           close (mbfi);
 795           return EXIT_FAILURE;
 796         }
 797     }
 798
 799   /* On AFS, a call to write only modifies the file in the local
 800    *     workstation's AFS cache.  The changes are not written to the server
 801    *      until a call to fsync or close is made.  Users with AFS home
 802    *      directories have lost mail when over quota because these checks were
 803    *      not made in previous versions of movemail. */
 804
 805 #ifdef BSD_SYSTEM
 806   if (fsync (mbfi) < 0)
 807     {
 808       error ("Error in fsync: %s", strerror (errno), 0);
 809       return EXIT_FAILURE;
 810     }
 811 #endif
 812
 813   if (close (mbfi) == -1)
 814     {
 815       error ("Error in close: %s", strerror (errno), 0);
 816       return EXIT_FAILURE;
 817     }
 818
 819   if (! preserve)
 820     for (i = 1; i <= nmsgs; i++)
 821       {
 822         if (pop_delete (server, i))
 823           {
 824             error ("Error from POP server: %s", pop_error, 0);
 825             pop_close (server);
 826             return EXIT_FAILURE;
 827           }
 828       }
 829
 830   if (pop_quit (server))
 831     {
 832       error ("Error from POP server: %s", pop_error, 0);
 833       return EXIT_FAILURE;
 834     }
 835
 836   return EXIT_SUCCESS;
 837 }
 838
 839 int
 840 pop_retr (server, msgno, arg)
 841      popserver server;
 842      int msgno;
 843      FILE *arg;
 844 {
 845   extern char *strerror ();
 846   char *line;
 847   int ret;
 848
 849   if (pop_retrieve_first (server, msgno, &line))
 850     {
 851       char *error = concat ("Error from POP server: ", pop_error, "");
 852       strncpy (Errmsg, error, sizeof (Errmsg));
 853       Errmsg[sizeof (Errmsg)-1] = '\0';
 854       free(error);
 855       return (NOTOK);
 856     }
 857
 858   while ((ret = pop_retrieve_next (server, &line)) >= 0)
 859     {
 860       if (! line)
 861         break;
 862
 863       if (mbx_write (line, ret, arg) != OK)
 864         {
 865           strcpy (Errmsg, strerror (errno));
 866           pop_close (server);
 867           return (NOTOK);
 868         }
 869     }
 870
 871   if (ret)
 872     {
 873       char *error = concat ("Error from POP server: ", pop_error, "");
 874       strncpy (Errmsg, error, sizeof (Errmsg));
 875       Errmsg[sizeof (Errmsg)-1] = '\0';
 876       free(error);
 877       return (NOTOK);
 878     }
 879
 880   return (OK);
 881 }
 882
 883 /* Do this as a macro instead of using strcmp to save on execution time. */
 884 #define IS_FROM_LINE(a) ((a[0] == 'F') \
 885                          && (a[1] == 'r') \
 886                          && (a[2] == 'o') \
 887                          && (a[3] == 'm') \
 888                          && (a[4] == ' '))
 889
 890 int
 891 mbx_write (line, len, mbf)
 892      char *line;
 893      int len;
 894      FILE *mbf;
 895 {
 896 #ifdef MOVEMAIL_QUOTE_POP_FROM_LINES
 897   if (IS_FROM_LINE (line))
 898     {
 899       if (fputc ('>', mbf) == EOF)
 900         return (NOTOK);
 901     }
 902 #endif
 903   if (line[0] == '\037')
 904     {
 905       if (fputs ("^_", mbf) == EOF)
 906         return (NOTOK);
 907       line++;
 908       len--;
 909     }
 910   if (fwrite (line, 1, len, mbf) != len)
 911     return (NOTOK);
 912   if (fputc (0x0a, mbf) == EOF)
 913     return (NOTOK);
 914   return (OK);
 915 }
 916
 917 int
 918 mbx_delimit_begin (mbf)
 919      FILE *mbf;
 920 {
 921   if (fputs ("\f\n0, unseen,,\n", mbf) == EOF)
 922     return (NOTOK);
 923   return (OK);
 924 }
 925
 926 int
 927 mbx_delimit_end (mbf)
 928      FILE *mbf;
 929 {
 930   if (putc ('\037', mbf) == EOF)
 931     return (NOTOK);
 932   return (OK);
 933 }
 934
 935 #endif /* MAIL_USE_POP */
 936 \f
 937 #ifndef HAVE_STRERROR
 938 char *
 939 strerror (errnum)
 940      int errnum;
 941 {
 942   extern char *sys_errlist[];
 943   extern int sys_nerr;
 944
 945   if (errnum >= 0 && errnum < sys_nerr)
 946     return sys_errlist[errnum];
 947   return (char *) "Unknown error";
 948 }
 949
 950 #endif /* ! HAVE_STRERROR */
 951
 952 /* arch-tag: 1c323112-41fe-4fe5-8de9-494de631f73f
 953    (do not change this comment) */
 954
 955 /* movemail.c ends here */