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, 92, 93, 94, 96, 1999 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs; see the file COPYING.  If not, write to
  19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22 /* Important notice: defining MAIL_USE_FLOCK or MAIL_USE_LOCKF *will
  23    cause loss of mail* if you do it on a system that does not normally
  24    use flock as its way of interlocking access to inbox files.  The
  25    setting of MAIL_USE_FLOCK and MAIL_USE_LOCKF *must agree* with the
  26    system's own conventions.  It is not a choice that is up to you.
  27
  28    So, if your system uses lock files rather than flock, then the only way
  29    you can get proper operation is to enable movemail to write lockfiles there.
  30    This means you must either give that directory access modes
  31    that permit everyone to write lockfiles in it, or you must make movemail
  32    a setuid or setgid program.  */
  33
  34 /*
  35  * Modified January, 1986 by Michael R. Gretzinger (Project Athena)
  36  *
  37  * Added POP (Post Office Protocol) service.  When compiled -DMAIL_USE_POP
  38  * movemail will accept input filename arguments of the form
  39  * "po:username".  This will cause movemail to open a connection to
  40  * a pop server running on $MAILHOST (environment variable).  Movemail
  41  * must be setuid to root in order to work with POP.
  42  *
  43  * New module: popmail.c
  44  * Modified routines:
  45  *      main - added code within #ifdef MAIL_USE_POP; added setuid (getuid ())
  46  *              after POP code.
  47  * New routines in movemail.c:
  48  *      get_errmsg - return pointer to system error message
  49  *
  50  * Modified August, 1993 by Jonathan Kamens (OpenVision Technologies)
  51  *
  52  * Move all of the POP code into a separate file, "pop.c".
  53  * Use strerror instead of get_errmsg.
  54  *
  55  */
  56
  57 #define NO_SHORTNAMES   /* Tell config not to load remap.h */
  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
  65 #include <getopt.h>
  66 #ifdef HAVE_UNISTD_H
  67 #include <unistd.h>
  68 #endif
  69 #ifdef HAVE_FCNTL_H
  70 #include <fcntl.h>
  71 #endif
  72 #include "syswait.h"
  73 #ifdef MAIL_USE_POP
  74 #include "pop.h"
  75 #endif
  76
  77 #ifdef MSDOS
  78 #undef access
  79 #endif /* MSDOS */
  80
  81 #ifndef DIRECTORY_SEP
  82 #define DIRECTORY_SEP '/'
  83 #endif
  84 #ifndef IS_DIRECTORY_SEP
  85 #define IS_DIRECTORY_SEP(_c_) ((_c_) == DIRECTORY_SEP)
  86 #endif
  87
  88 #ifdef WINDOWSNT
  89 #include "ntlib.h"
  90 #undef access
  91 #undef unlink
  92 #define fork() 0
  93 #define wait(var) (*(var) = 0)
  94 /* Unfortunately, Samba doesn't seem to properly lock Unix files even
  95    though the locking call succeeds (and indeed blocks local access from
  96    other NT programs).  If you have direct file access using an NFS
  97    client or something other than Samba, the locking call might work
  98    properly - make sure it does before you enable this!
  99
 100    [18-Feb-97 andrewi] I now believe my comment above to be incorrect,
 101    since it was based on a misunderstanding of how locking calls are
 102    implemented and used on Unix.  */
 103 //#define DISABLE_DIRECT_ACCESS
 104
 105 #include <fcntl.h>
 106 #endif /* WINDOWSNT */
 107
 108 #ifndef F_OK
 109 #define F_OK 0
 110 #define X_OK 1
 111 #define W_OK 2
 112 #define R_OK 4
 113 #endif
 114
 115 #if defined (XENIX) || defined (WINDOWSNT)
 116 #include <sys/locking.h>
 117 #endif
 118
 119 #ifdef MAIL_USE_LOCKF
 120 #define MAIL_USE_SYSTEM_LOCK
 121 #endif
 122
 123 #ifdef MAIL_USE_FLOCK
 124 #define MAIL_USE_SYSTEM_LOCK
 125 #endif
 126
 127 #ifdef MAIL_USE_MMDF
 128 extern int lk_open (), lk_close ();
 129 #endif
 130
 131 #if !defined (MAIL_USE_SYSTEM_LOCK) && !defined (MAIL_USE_MMDF) && \
 132         (defined (HAVE_LIBMAIL) || defined (HAVE_LIBLOCKFILE)) && \
 133         defined (HAVE_MAILLOCK_H)
 134 #include <maillock.h>
 135 /* We can't use maillock unless we know what directory system mail
 136    files appear in. */
 137 #ifdef MAILDIR
 138 #define MAIL_USE_MAILLOCK
 139 static char *mail_spool_name ();
 140 #endif
 141 #endif
 142
 143 #ifndef errno
 144 extern int errno;
 145 #endif
 146 char *strerror ();
 147 #ifdef HAVE_INDEX
 148 extern char *index __P ((const char *, int));
 149 #endif
 150 #ifdef HAVE_RINDEX
 151 extern char *rindex __P((const char *, int));
 152 #endif
 153
 154 void fatal ();
 155 void error ();
 156 void pfatal_with_name ();
 157 void pfatal_and_delete ();
 158 char *concat ();
 159 long *xmalloc ();
 160 int popmail ();
 161 int pop_retr ();
 162 int mbx_write ();
 163 int mbx_delimit_begin ();
 164 int mbx_delimit_end ();
 165
 166 /* Nonzero means this is name of a lock file to delete on fatal error.  */
 167 char *delete_lockname;
 168
 169 int
 170 main (argc, argv)
 171      int argc;
 172      char **argv;
 173 {
 174   char *inname, *outname;
 175   int indesc, outdesc;
 176   int nread;
 177   WAITTYPE status;
 178   int c, preserve_mail = 0;
 179
 180 #ifndef MAIL_USE_SYSTEM_LOCK
 181   struct stat st;
 182   long now;
 183   int tem;
 184   char *lockname, *p;
 185   char *tempname;
 186   int desc;
 187 #endif /* not MAIL_USE_SYSTEM_LOCK */
 188
 189 #ifdef MAIL_USE_MAILLOCK
 190   char *spool_name;
 191 #endif
 192
 193 #ifdef MAIL_USE_POP
 194   int pop_reverse_order = 0;
 195 # define ARGSTR "pr"
 196 #else /* ! MAIL_USE_POP */
 197 # define ARGSTR "p"
 198 #endif /* MAIL_USE_POP */
 199
 200 #ifdef WINDOWSNT
 201   /* Ensure all file i/o is in binary mode. */
 202   _fmode = _O_BINARY;
 203 #endif
 204
 205   delete_lockname = 0;
 206
 207   while ((c = getopt (argc, argv, ARGSTR)) != EOF)
 208     {
 209       switch (c) {
 210 #ifdef MAIL_USE_POP
 211       case 'r':
 212         pop_reverse_order = 1;
 213         break;
 214 #endif
 215       case 'p':
 216         preserve_mail++;
 217         break;
 218       default:
 219         exit(1);
 220       }
 221     }
 222
 223   if (
 224 #ifdef MAIL_USE_POP
 225       (argc - optind < 2) || (argc - optind > 3)
 226 #else
 227       (argc - optind != 2)
 228 #endif
 229       )
 230     {
 231       fprintf (stderr, "Usage: movemail [-p] inbox destfile%s\n",
 232 #ifdef MAIL_USE_POP
 233                " [POP-password]"
 234 #else
 235                ""
 236 #endif
 237                );
 238       exit (1);
 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);
 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 != write (outdesc, buf, nread))
 470               {
 471                 int saved_errno = errno;
 472                 unlink (outname);
 473                 errno = saved_errno;
 474                 pfatal_with_name (outname);
 475               }
 476             if (nread < sizeof buf)
 477               break;
 478 #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK)
 479             if (spool_name)
 480               {
 481                 now = time (0);
 482                 if (now - touched_lock > 60)
 483                   {
 484                     touchlock ();
 485                     touched_lock = now;
 486                   }
 487               }
 488 #endif /* MAIL_USE_MAILLOCK */
 489           }
 490       }
 491
 492 #ifdef BSD_SYSTEM
 493       if (fsync (outdesc) < 0)
 494         pfatal_and_delete (outname);
 495 #endif
 496
 497       /* Check to make sure no errors before we zap the inbox.  */
 498       if (close (outdesc) != 0)
 499         pfatal_and_delete (outname);
 500
 501 #ifdef MAIL_USE_SYSTEM_LOCK
 502       if (! preserve_mail)
 503         {
 504 #if defined (STRIDE) || defined (XENIX)
 505           /* Stride, xenix have file locking, but no ftruncate.
 506              This mess will do. */
 507           close (open (inname, O_CREAT | O_TRUNC | O_RDWR, 0666));
 508 #else
 509           ftruncate (indesc, 0L);
 510 #endif /* STRIDE or XENIX */
 511         }
 512 #endif /* MAIL_USE_SYSTEM_LOCK */
 513
 514 #ifdef MAIL_USE_MMDF
 515       lk_close (indesc, 0, 0, 0);
 516 #else
 517       close (indesc);
 518 #endif
 519
 520 #ifndef MAIL_USE_SYSTEM_LOCK
 521       if (! preserve_mail)
 522         {
 523           /* Delete the input file; if we can't, at least get rid of its
 524              contents.  */
 525 #ifdef MAIL_UNLINK_SPOOL
 526           /* This is generally bad to do, because it destroys the permissions
 527              that were set on the file.  Better to just empty the file.  */
 528           if (unlink (inname) < 0 && errno != ENOENT)
 529 #endif /* MAIL_UNLINK_SPOOL */
 530             creat (inname, 0600);
 531         }
 532 #endif /* not MAIL_USE_SYSTEM_LOCK */
 533
 534 #ifdef MAIL_USE_MAILLOCK
 535       /* This has to occur in the child, i.e., in the process that
 536          acquired the lock! */
 537       if (spool_name)
 538         mailunlock ();
 539 #endif
 540       exit (0);
 541     }
 542
 543   wait (&status);
 544   if (!WIFEXITED (status))
 545     exit (1);
 546   else if (WRETCODE (status) != 0)
 547     exit (WRETCODE (status));
 548
 549 #if !defined (MAIL_USE_MMDF) && !defined (MAIL_USE_SYSTEM_LOCK)
 550 #ifdef MAIL_USE_MAILLOCK
 551   if (! spool_name)
 552 #endif /* MAIL_USE_MAILLOCK */
 553     unlink (lockname);
 554 #endif /* not MAIL_USE_MMDF and not MAIL_USE_SYSTEM_LOCK */
 555
 556 #endif /* ! DISABLE_DIRECT_ACCESS */
 557
 558   return 0;
 559 }
 560
 561 #ifdef MAIL_USE_MAILLOCK
 562 /* This function uses stat to confirm that the mail directory is
 563    identical to the directory of the input file, rather than just
 564    string-comparing the two paths, because one or both of them might
 565    be symbolic links pointing to some other directory. */
 566 static char *
 567 mail_spool_name (inname)
 568      char *inname;
 569 {
 570   struct stat stat1, stat2;
 571   char *indir, *fname;
 572   int status;
 573
 574   if (! (fname = rindex (inname, '/')))
 575     return NULL;
 576
 577   fname++;
 578
 579   if (stat (MAILDIR, &stat1) < 0)
 580     return NULL;
 581
 582   indir = (char *) xmalloc (fname - inname + 1);
 583   strncpy (indir, inname, fname - inname);
 584   indir[fname-inname] = '\0';
 585
 586
 587   status = stat (indir, &stat2);
 588
 589   free (indir);
 590
 591   if (status < 0)
 592     return NULL;
 593
 594   if (stat1.st_dev == stat2.st_dev
 595       && stat1.st_ino == stat2.st_ino)
 596     return fname;
 597
 598   return NULL;
 599 }
 600 #endif /* MAIL_USE_MAILLOCK */
 601 \f
 602 /* Print error message and exit.  */
 603
 604 void
 605 fatal (s1, s2)
 606      char *s1, *s2;
 607 {
 608   if (delete_lockname)
 609     unlink (delete_lockname);
 610   error (s1, s2, 0);
 611   exit (1);
 612 }
 613
 614 /* Print error message.  `s1' is printf control string, `s2' and `s3'
 615    are args for it or null. */
 616
 617 void
 618 error (s1, s2, s3)
 619      char *s1, *s2, *s3;
 620 {
 621   fprintf (stderr, "movemail: ");
 622   if (s3)
 623     fprintf (stderr, s1, s2, s3);
 624   else if (s2)
 625     fprintf (stderr, s1, s2);
 626   else
 627     fprintf (stderr, s1);
 628   fprintf (stderr, "\n");
 629 }
 630
 631 void
 632 pfatal_with_name (name)
 633      char *name;
 634 {
 635   char *s = concat ("", strerror (errno), " for %s");
 636   fatal (s, name);
 637 }
 638
 639 void
 640 pfatal_and_delete (name)
 641      char *name;
 642 {
 643   char *s = concat ("", strerror (errno), " for %s");
 644   unlink (name);
 645   fatal (s, name);
 646 }
 647
 648 /* Return a newly-allocated string whose contents concatenate those of s1, s2, s3.  */
 649
 650 char *
 651 concat (s1, s2, s3)
 652      char *s1, *s2, *s3;
 653 {
 654   int len1 = strlen (s1), len2 = strlen (s2), len3 = strlen (s3);
 655   char *result = (char *) xmalloc (len1 + len2 + len3 + 1);
 656
 657   strcpy (result, s1);
 658   strcpy (result + len1, s2);
 659   strcpy (result + len1 + len2, s3);
 660   *(result + len1 + len2 + len3) = 0;
 661
 662   return result;
 663 }
 664
 665 /* Like malloc but get fatal error if memory is exhausted.  */
 666
 667 long *
 668 xmalloc (size)
 669      unsigned size;
 670 {
 671   long *result = (long *) malloc (size);
 672   if (!result)
 673     fatal ("virtual memory exhausted", 0);
 674   return result;
 675 }
 676 \f
 677 /* This is the guts of the interface to the Post Office Protocol.  */
 678
 679 #ifdef MAIL_USE_POP
 680
 681 #ifndef WINDOWSNT
 682 #include <sys/socket.h>
 683 #include <netinet/in.h>
 684 #include <netdb.h>
 685 #else
 686 #undef _WINSOCKAPI_
 687 #include <winsock.h>
 688 #endif
 689 #include <pwd.h>
 690
 691 #define NOTOK (-1)
 692 #define OK 0
 693 #define DONE 1
 694
 695 char *progname;
 696 FILE *sfi;
 697 FILE *sfo;
 698 char ibuffer[BUFSIZ];
 699 char obuffer[BUFSIZ];
 700 char Errmsg[200];               /* POP errors, at least, can exceed
 701                                    the original length of 80.  */
 702
 703 /*
 704  * The full legal syntax for a POP mailbox specification for movemail
 705  * is "po:username:hostname".  The ":hostname" is optional; if it is
 706  * omitted, the MAILHOST environment variable will be consulted.  Note
 707  * that by the time popmail() is called the "po:" has been stripped
 708  * off of the front of the mailbox name.
 709  *
 710  * If the mailbox is in the form "po:username:hostname", then it is
 711  * modified by this function -- the second colon is replaced by a
 712  * null.
 713  */
 714
 715 int
 716 popmail (mailbox, outfile, preserve, password, reverse_order)
 717      char *mailbox;
 718      char *outfile;
 719      int preserve;
 720      char *password;
 721      int reverse_order;
 722 {
 723   int nmsgs, nbytes;
 724   register int i;
 725   int mbfi;
 726   FILE *mbf;
 727   char *getenv ();
 728   popserver server;
 729   int start, end, increment;
 730   char *user, *hostname;
 731
 732   user = mailbox;
 733   if ((hostname = index(mailbox, ':')))
 734     *hostname++ = '\0';
 735
 736   server = pop_open (hostname, user, password, POP_NO_GETPASS);
 737   if (! server)
 738     {
 739       error ("Error connecting to POP server: %s", pop_error, 0);
 740       return (1);
 741     }
 742
 743   if (pop_stat (server, &nmsgs, &nbytes))
 744     {
 745       error ("Error getting message count from POP server: %s", pop_error, 0);
 746       return (1);
 747     }
 748
 749   if (!nmsgs)
 750     {
 751       pop_close (server);
 752       return (0);
 753     }
 754
 755   mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
 756   if (mbfi < 0)
 757     {
 758       pop_close (server);
 759       error ("Error in open: %s, %s", strerror (errno), outfile);
 760       return (1);
 761     }
 762   fchown (mbfi, getuid (), -1);
 763
 764   if ((mbf = fdopen (mbfi, "wb")) == NULL)
 765     {
 766       pop_close (server);
 767       error ("Error in fdopen: %s", strerror (errno), 0);
 768       close (mbfi);
 769       unlink (outfile);
 770       return (1);
 771     }
 772
 773   if (reverse_order)
 774     {
 775       start = nmsgs;
 776       end = 1;
 777       increment = -1;
 778     }
 779   else
 780     {
 781       start = 1;
 782       end = nmsgs;
 783       increment = 1;
 784     }
 785
 786   for (i = start; i * increment <= end * increment; i += increment)
 787     {
 788       mbx_delimit_begin (mbf);
 789       if (pop_retr (server, i, mbf) != OK)
 790         {
 791           error (Errmsg, 0, 0);
 792           close (mbfi);
 793           return (1);
 794         }
 795       mbx_delimit_end (mbf);
 796       fflush (mbf);
 797       if (ferror (mbf))
 798         {
 799           error ("Error in fflush: %s", strerror (errno), 0);
 800           pop_close (server);
 801           close (mbfi);
 802           return (1);
 803         }
 804     }
 805
 806   /* On AFS, a call to write only modifies the file in the local
 807    *     workstation's AFS cache.  The changes are not written to the server
 808    *      until a call to fsync or close is made.  Users with AFS home
 809    *      directories have lost mail when over quota because these checks were
 810    *      not made in previous versions of movemail. */
 811
 812 #ifdef BSD_SYSTEM
 813   if (fsync (mbfi) < 0)
 814     {
 815       error ("Error in fsync: %s", strerror (errno), 0);
 816       return (1);
 817     }
 818 #endif
 819
 820   if (close (mbfi) == -1)
 821     {
 822       error ("Error in close: %s", strerror (errno), 0);
 823       return (1);
 824     }
 825
 826   if (! preserve)
 827     for (i = 1; i <= nmsgs; i++)
 828       {
 829         if (pop_delete (server, i))
 830           {
 831             error ("Error from POP server: %s", pop_error, 0);
 832             pop_close (server);
 833             return (1);
 834           }
 835       }
 836
 837   if (pop_quit (server))
 838     {
 839       error ("Error from POP server: %s", pop_error, 0);
 840       return (1);
 841     }
 842
 843   return (0);
 844 }
 845
 846 int
 847 pop_retr (server, msgno, arg)
 848      popserver server;
 849      int msgno;
 850      FILE *arg;
 851 {
 852   extern char *strerror ();
 853   char *line;
 854   int ret;
 855
 856   if (pop_retrieve_first (server, msgno, &line))
 857     {
 858       char *error = concat ("Error from POP server: ", pop_error, "");
 859       strncpy (Errmsg, error, sizeof (Errmsg));
 860       Errmsg[sizeof (Errmsg)-1] = '\0';
 861       free(error);
 862       return (NOTOK);
 863     }
 864
 865   while ((ret = pop_retrieve_next (server, &line)) >= 0)
 866     {
 867       if (! line)
 868         break;
 869
 870       if (mbx_write (line, ret, arg) != OK)
 871         {
 872           strcpy (Errmsg, strerror (errno));
 873           pop_close (server);
 874           return (NOTOK);
 875         }
 876     }
 877
 878   if (ret)
 879     {
 880       char *error = concat ("Error from POP server: ", pop_error, "");
 881       strncpy (Errmsg, error, sizeof (Errmsg));
 882       Errmsg[sizeof (Errmsg)-1] = '\0';
 883       free(error);
 884       return (NOTOK);
 885     }
 886
 887   return (OK);
 888 }
 889
 890 /* Do this as a macro instead of using strcmp to save on execution time. */
 891 #define IS_FROM_LINE(a) ((a[0] == 'F') \
 892                          && (a[1] == 'r') \
 893                          && (a[2] == 'o') \
 894                          && (a[3] == 'm') \
 895                          && (a[4] == ' '))
 896
 897 int
 898 mbx_write (line, len, mbf)
 899      char *line;
 900      int len;
 901      FILE *mbf;
 902 {
 903 #ifdef MOVEMAIL_QUOTE_POP_FROM_LINES
 904   if (IS_FROM_LINE (line))
 905     {
 906       if (fputc ('>', mbf) == EOF)
 907         return (NOTOK);
 908     }
 909 #endif
 910   if (line[0] == '\037')
 911     {
 912       if (fputs ("^_", mbf) == EOF)
 913         return (NOTOK);
 914       line++;
 915       len--;
 916     }
 917   if (fwrite (line, 1, len, mbf) != len)
 918     return (NOTOK);
 919   if (fputc (0x0a, mbf) == EOF)
 920     return (NOTOK);
 921   return (OK);
 922 }
 923
 924 int
 925 mbx_delimit_begin (mbf)
 926      FILE *mbf;
 927 {
 928   if (fputs ("\f\n0, unseen,,\n", mbf) == EOF)
 929     return (NOTOK);
 930   return (OK);
 931 }
 932
 933 int
 934 mbx_delimit_end (mbf)
 935      FILE *mbf;
 936 {
 937   if (putc ('\037', mbf) == EOF)
 938     return (NOTOK);
 939   return (OK);
 940 }
 941
 942 #endif /* MAIL_USE_POP */
 943 \f
 944 #ifndef HAVE_STRERROR
 945 char *
 946 strerror (errnum)
 947      int errnum;
 948 {
 949   extern char *sys_errlist[];
 950   extern int sys_nerr;
 951
 952   if (errnum >= 0 && errnum < sys_nerr)
 953     return sys_errlist[errnum];
 954   return (char *) "Unknown error";
 955 }
 956
 957 #endif /* ! HAVE_STRERROR */