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 #if defined (XENIX) || defined (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 #if defined (BSD_SYSTEM) || defined (XENIX)
 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 || XENIX */
 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 XENIX
 426           status = locking (indesc, LK_RLCK, 0L);
 427 #else
 428 #ifdef WINDOWSNT
 429           status = locking (indesc, LK_RLCK, -1L);
 430 #else
 431           status = flock (indesc, LOCK_EX);
 432 #endif
 433 #endif
 434 #endif /* not MAIL_USE_LOCKF */
 435 #endif /* MAIL_USE_SYSTEM_LOCK */
 436         }
 437
 438       /* If it fails, retry up to 5 times
 439          for certain failure codes.  */
 440       if (status < 0)
 441         {
 442           if (++lockcount <= 5)
 443             {
 444 #ifdef EAGAIN
 445               if (errno == EAGAIN)
 446                 {
 447                   sleep (1);
 448                   goto retry_lock;
 449                 }
 450 #endif
 451 #ifdef EBUSY
 452               if (errno == EBUSY)
 453                 {
 454                   sleep (1);
 455                   goto retry_lock;
 456                 }
 457 #endif
 458             }
 459
 460           pfatal_with_name (inname);
 461         }
 462
 463       {
 464         char buf[1024];
 465
 466         while (1)
 467           {
 468             nread = read (indesc, buf, sizeof buf);
 469             if (nread < 0)
 470               pfatal_with_name (inname);
 471             if (nread != write (outdesc, buf, nread))
 472               {
 473                 int saved_errno = errno;
 474                 unlink (outname);
 475                 errno = saved_errno;
 476                 pfatal_with_name (outname);
 477               }
 478             if (nread < sizeof buf)
 479               break;
 480 #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK)
 481             if (spool_name)
 482               {
 483                 now = time (0);
 484                 if (now - touched_lock > 60)
 485                   {
 486                     touchlock ();
 487                     touched_lock = now;
 488                   }
 489               }
 490 #endif /* MAIL_USE_MAILLOCK */
 491           }
 492       }
 493
 494 #ifdef BSD_SYSTEM
 495       if (fsync (outdesc) < 0)
 496         pfatal_and_delete (outname);
 497 #endif
 498
 499       /* Check to make sure no errors before we zap the inbox.  */
 500       if (close (outdesc) != 0)
 501         pfatal_and_delete (outname);
 502
 503 #ifdef MAIL_USE_SYSTEM_LOCK
 504       if (! preserve_mail)
 505         {
 506           ftruncate (indesc, 0L);
 507         }
 508 #endif /* MAIL_USE_SYSTEM_LOCK */
 509
 510 #ifdef MAIL_USE_MMDF
 511       lk_close (indesc, 0, 0, 0);
 512 #else
 513       close (indesc);
 514 #endif
 515
 516 #ifndef MAIL_USE_SYSTEM_LOCK
 517       if (! preserve_mail)
 518         {
 519           /* Delete the input file; if we can't, at least get rid of its
 520              contents.  */
 521 #ifdef MAIL_UNLINK_SPOOL
 522           /* This is generally bad to do, because it destroys the permissions
 523              that were set on the file.  Better to just empty the file.  */
 524           if (unlink (inname) < 0 && errno != ENOENT)
 525 #endif /* MAIL_UNLINK_SPOOL */
 526             creat (inname, 0600);
 527         }
 528 #endif /* not MAIL_USE_SYSTEM_LOCK */
 529
 530 #ifdef MAIL_USE_MAILLOCK
 531       /* This has to occur in the child, i.e., in the process that
 532          acquired the lock! */
 533       if (spool_name)
 534         mailunlock ();
 535 #endif
 536       exit (EXIT_SUCCESS);
 537     }
 538
 539   wait (&status);
 540   if (!WIFEXITED (status))
 541     exit (EXIT_FAILURE);
 542   else if (WRETCODE (status) != 0)
 543     exit (WRETCODE (status));
 544
 545 #if !defined (MAIL_USE_MMDF) && !defined (MAIL_USE_SYSTEM_LOCK)
 546 #ifdef MAIL_USE_MAILLOCK
 547   if (! spool_name)
 548 #endif /* MAIL_USE_MAILLOCK */
 549     unlink (lockname);
 550 #endif /* not MAIL_USE_MMDF and not MAIL_USE_SYSTEM_LOCK */
 551
 552 #endif /* ! DISABLE_DIRECT_ACCESS */
 553
 554   return EXIT_SUCCESS;
 555 }
 556
 557 #ifdef MAIL_USE_MAILLOCK
 558 /* This function uses stat to confirm that the mail directory is
 559    identical to the directory of the input file, rather than just
 560    string-comparing the two paths, because one or both of them might
 561    be symbolic links pointing to some other directory. */
 562 static char *
 563 mail_spool_name (inname)
 564      char *inname;
 565 {
 566   struct stat stat1, stat2;
 567   char *indir, *fname;
 568   int status;
 569
 570   if (! (fname = rindex (inname, '/')))
 571     return NULL;
 572
 573   fname++;
 574
 575   if (stat (MAILDIR, &stat1) < 0)
 576     return NULL;
 577
 578   indir = (char *) xmalloc (fname - inname + 1);
 579   strncpy (indir, inname, fname - inname);
 580   indir[fname-inname] = '\0';
 581
 582
 583   status = stat (indir, &stat2);
 584
 585   free (indir);
 586
 587   if (status < 0)
 588     return NULL;
 589
 590   if (stat1.st_dev == stat2.st_dev
 591       && stat1.st_ino == stat2.st_ino)
 592     return fname;
 593
 594   return NULL;
 595 }
 596 #endif /* MAIL_USE_MAILLOCK */
 597 \f
 598 /* Print error message and exit.  */
 599
 600 void
 601 fatal (s1, s2, s3)
 602      char *s1, *s2, *s3;
 603 {
 604   if (delete_lockname)
 605     unlink (delete_lockname);
 606   error (s1, s2, s3);
 607   exit (EXIT_FAILURE);
 608 }
 609
 610 /* Print error message.  `s1' is printf control string, `s2' and `s3'
 611    are args for it or null. */
 612
 613 void
 614 error (s1, s2, s3)
 615      char *s1, *s2, *s3;
 616 {
 617   fprintf (stderr, "movemail: ");
 618   if (s3)
 619     fprintf (stderr, s1, s2, s3);
 620   else if (s2)
 621     fprintf (stderr, s1, s2);
 622   else
 623     fprintf (stderr, s1);
 624   fprintf (stderr, "\n");
 625 }
 626
 627 void
 628 pfatal_with_name (name)
 629      char *name;
 630 {
 631   fatal ("%s for %s", strerror (errno), name);
 632 }
 633
 634 void
 635 pfatal_and_delete (name)
 636      char *name;
 637 {
 638   char *s = strerror (errno);
 639   unlink (name);
 640   fatal ("%s for %s", s, name);
 641 }
 642
 643 /* Return a newly-allocated string whose contents concatenate those of s1, s2, s3.  */
 644
 645 char *
 646 concat (s1, s2, s3)
 647      char *s1, *s2, *s3;
 648 {
 649   int len1 = strlen (s1), len2 = strlen (s2), len3 = strlen (s3);
 650   char *result = (char *) xmalloc (len1 + len2 + len3 + 1);
 651
 652   strcpy (result, s1);
 653   strcpy (result + len1, s2);
 654   strcpy (result + len1 + len2, s3);
 655   *(result + len1 + len2 + len3) = 0;
 656
 657   return result;
 658 }
 659
 660 /* Like malloc but get fatal error if memory is exhausted.  */
 661
 662 long *
 663 xmalloc (size)
 664      unsigned size;
 665 {
 666   long *result = (long *) malloc (size);
 667   if (!result)
 668     fatal ("virtual memory exhausted", 0, 0);
 669   return result;
 670 }
 671 \f
 672 /* This is the guts of the interface to the Post Office Protocol.  */
 673
 674 #ifdef MAIL_USE_POP
 675
 676 #ifndef WINDOWSNT
 677 #include <sys/socket.h>
 678 #include <netinet/in.h>
 679 #include <netdb.h>
 680 #else
 681 #undef _WINSOCKAPI_
 682 #include <winsock.h>
 683 #endif
 684 #include <pwd.h>
 685
 686 #define NOTOK (-1)
 687 #define OK 0
 688 #define DONE 1
 689
 690 char *progname;
 691 FILE *sfi;
 692 FILE *sfo;
 693 char ibuffer[BUFSIZ];
 694 char obuffer[BUFSIZ];
 695 char Errmsg[200];               /* POP errors, at least, can exceed
 696                                    the original length of 80.  */
 697
 698 /*
 699  * The full legal syntax for a POP mailbox specification for movemail
 700  * is "po:username:hostname".  The ":hostname" is optional; if it is
 701  * omitted, the MAILHOST environment variable will be consulted.  Note
 702  * that by the time popmail() is called the "po:" has been stripped
 703  * off of the front of the mailbox name.
 704  *
 705  * If the mailbox is in the form "po:username:hostname", then it is
 706  * modified by this function -- the second colon is replaced by a
 707  * null.
 708  *
 709  * Return a value suitable for passing to `exit'.
 710  */
 711
 712 int
 713 popmail (mailbox, outfile, preserve, password, reverse_order)
 714      char *mailbox;
 715      char *outfile;
 716      int preserve;
 717      char *password;
 718      int reverse_order;
 719 {
 720   int nmsgs, nbytes;
 721   register int i;
 722   int mbfi;
 723   FILE *mbf;
 724   char *getenv ();
 725   popserver server;
 726   int start, end, increment;
 727   char *user, *hostname;
 728
 729   user = mailbox;
 730   if ((hostname = index(mailbox, ':')))
 731     *hostname++ = '\0';
 732
 733   server = pop_open (hostname, user, password, POP_NO_GETPASS);
 734   if (! server)
 735     {
 736       error ("Error connecting to POP server: %s", pop_error, 0);
 737       return EXIT_FAILURE;
 738     }
 739
 740   if (pop_stat (server, &nmsgs, &nbytes))
 741     {
 742       error ("Error getting message count from POP server: %s", pop_error, 0);
 743       return EXIT_FAILURE;
 744     }
 745
 746   if (!nmsgs)
 747     {
 748       pop_close (server);
 749       return EXIT_SUCCESS;
 750     }
 751
 752   mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
 753   if (mbfi < 0)
 754     {
 755       pop_close (server);
 756       error ("Error in open: %s, %s", strerror (errno), outfile);
 757       return EXIT_FAILURE;
 758     }
 759   fchown (mbfi, getuid (), -1);
 760
 761   if ((mbf = fdopen (mbfi, "wb")) == NULL)
 762     {
 763       pop_close (server);
 764       error ("Error in fdopen: %s", strerror (errno), 0);
 765       close (mbfi);
 766       unlink (outfile);
 767       return EXIT_FAILURE;
 768     }
 769
 770   if (reverse_order)
 771     {
 772       start = nmsgs;
 773       end = 1;
 774       increment = -1;
 775     }
 776   else
 777     {
 778       start = 1;
 779       end = nmsgs;
 780       increment = 1;
 781     }
 782
 783   for (i = start; i * increment <= end * increment; i += increment)
 784     {
 785       mbx_delimit_begin (mbf);
 786       if (pop_retr (server, i, mbf) != OK)
 787         {
 788           error ("%s", Errmsg, 0);
 789           close (mbfi);
 790           return EXIT_FAILURE;
 791         }
 792       mbx_delimit_end (mbf);
 793       fflush (mbf);
 794       if (ferror (mbf))
 795         {
 796           error ("Error in fflush: %s", strerror (errno), 0);
 797           pop_close (server);
 798           close (mbfi);
 799           return EXIT_FAILURE;
 800         }
 801     }
 802
 803   /* On AFS, a call to write only modifies the file in the local
 804    *     workstation's AFS cache.  The changes are not written to the server
 805    *      until a call to fsync or close is made.  Users with AFS home
 806    *      directories have lost mail when over quota because these checks were
 807    *      not made in previous versions of movemail. */
 808
 809 #ifdef BSD_SYSTEM
 810   if (fsync (mbfi) < 0)
 811     {
 812       error ("Error in fsync: %s", strerror (errno), 0);
 813       return EXIT_FAILURE;
 814     }
 815 #endif
 816
 817   if (close (mbfi) == -1)
 818     {
 819       error ("Error in close: %s", strerror (errno), 0);
 820       return EXIT_FAILURE;
 821     }
 822
 823   if (! preserve)
 824     for (i = 1; i <= nmsgs; i++)
 825       {
 826         if (pop_delete (server, i))
 827           {
 828             error ("Error from POP server: %s", pop_error, 0);
 829             pop_close (server);
 830             return EXIT_FAILURE;
 831           }
 832       }
 833
 834   if (pop_quit (server))
 835     {
 836       error ("Error from POP server: %s", pop_error, 0);
 837       return EXIT_FAILURE;
 838     }
 839
 840   return EXIT_SUCCESS;
 841 }
 842
 843 int
 844 pop_retr (server, msgno, arg)
 845      popserver server;
 846      int msgno;
 847      FILE *arg;
 848 {
 849   extern char *strerror ();
 850   char *line;
 851   int ret;
 852
 853   if (pop_retrieve_first (server, msgno, &line))
 854     {
 855       char *error = concat ("Error from POP server: ", pop_error, "");
 856       strncpy (Errmsg, error, sizeof (Errmsg));
 857       Errmsg[sizeof (Errmsg)-1] = '\0';
 858       free(error);
 859       return (NOTOK);
 860     }
 861
 862   while ((ret = pop_retrieve_next (server, &line)) >= 0)
 863     {
 864       if (! line)
 865         break;
 866
 867       if (mbx_write (line, ret, arg) != OK)
 868         {
 869           strcpy (Errmsg, strerror (errno));
 870           pop_close (server);
 871           return (NOTOK);
 872         }
 873     }
 874
 875   if (ret)
 876     {
 877       char *error = concat ("Error from POP server: ", pop_error, "");
 878       strncpy (Errmsg, error, sizeof (Errmsg));
 879       Errmsg[sizeof (Errmsg)-1] = '\0';
 880       free(error);
 881       return (NOTOK);
 882     }
 883
 884   return (OK);
 885 }
 886
 887 /* Do this as a macro instead of using strcmp to save on execution time. */
 888 #define IS_FROM_LINE(a) ((a[0] == 'F') \
 889                          && (a[1] == 'r') \
 890                          && (a[2] == 'o') \
 891                          && (a[3] == 'm') \
 892                          && (a[4] == ' '))
 893
 894 int
 895 mbx_write (line, len, mbf)
 896      char *line;
 897      int len;
 898      FILE *mbf;
 899 {
 900 #ifdef MOVEMAIL_QUOTE_POP_FROM_LINES
 901   if (IS_FROM_LINE (line))
 902     {
 903       if (fputc ('>', mbf) == EOF)
 904         return (NOTOK);
 905     }
 906 #endif
 907   if (line[0] == '\037')
 908     {
 909       if (fputs ("^_", mbf) == EOF)
 910         return (NOTOK);
 911       line++;
 912       len--;
 913     }
 914   if (fwrite (line, 1, len, mbf) != len)
 915     return (NOTOK);
 916   if (fputc (0x0a, mbf) == EOF)
 917     return (NOTOK);
 918   return (OK);
 919 }
 920
 921 int
 922 mbx_delimit_begin (mbf)
 923      FILE *mbf;
 924 {
 925   if (fputs ("\f\n0, unseen,,\n", mbf) == EOF)
 926     return (NOTOK);
 927   return (OK);
 928 }
 929
 930 int
 931 mbx_delimit_end (mbf)
 932      FILE *mbf;
 933 {
 934   if (putc ('\037', mbf) == EOF)
 935     return (NOTOK);
 936   return (OK);
 937 }
 938
 939 #endif /* MAIL_USE_POP */
 940 \f
 941 #ifndef HAVE_STRERROR
 942 char *
 943 strerror (errnum)
 944      int errnum;
 945 {
 946   extern char *sys_errlist[];
 947   extern int sys_nerr;
 948
 949   if (errnum >= 0 && errnum < sys_nerr)
 950     return sys_errlist[errnum];
 951   return (char *) "Unknown error";
 952 }
 953
 954 #endif /* ! HAVE_STRERROR */
 955
 956 /* arch-tag: 1c323112-41fe-4fe5-8de9-494de631f73f
 957    (do not change this comment) */
 958
 959 /* movemail.c ends here */