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, 2002, 2003, 2004,
   4                  2005 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 2, 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 != 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 (EXIT_SUCCESS);
 541     }
 542
 543   wait (&status);
 544   if (!WIFEXITED (status))
 545     exit (EXIT_FAILURE);
 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 EXIT_SUCCESS;
 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, s3)
 606      char *s1, *s2, *s3;
 607 {
 608   if (delete_lockname)
 609     unlink (delete_lockname);
 610   error (s1, s2, s3);
 611   exit (EXIT_FAILURE);
 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   fatal ("%s for %s", strerror (errno), name);
 636 }
 637
 638 void
 639 pfatal_and_delete (name)
 640      char *name;
 641 {
 642   char *s = strerror (errno);
 643   unlink (name);
 644   fatal ("%s for %s", s, name);
 645 }
 646
 647 /* Return a newly-allocated string whose contents concatenate those of s1, s2, s3.  */
 648
 649 char *
 650 concat (s1, s2, s3)
 651      char *s1, *s2, *s3;
 652 {
 653   int len1 = strlen (s1), len2 = strlen (s2), len3 = strlen (s3);
 654   char *result = (char *) xmalloc (len1 + len2 + len3 + 1);
 655
 656   strcpy (result, s1);
 657   strcpy (result + len1, s2);
 658   strcpy (result + len1 + len2, s3);
 659   *(result + len1 + len2 + len3) = 0;
 660
 661   return result;
 662 }
 663
 664 /* Like malloc but get fatal error if memory is exhausted.  */
 665
 666 long *
 667 xmalloc (size)
 668      unsigned size;
 669 {
 670   long *result = (long *) malloc (size);
 671   if (!result)
 672     fatal ("virtual memory exhausted", 0, 0);
 673   return result;
 674 }
 675 \f
 676 /* This is the guts of the interface to the Post Office Protocol.  */
 677
 678 #ifdef MAIL_USE_POP
 679
 680 #ifndef WINDOWSNT
 681 #include <sys/socket.h>
 682 #include <netinet/in.h>
 683 #include <netdb.h>
 684 #else
 685 #undef _WINSOCKAPI_
 686 #include <winsock.h>
 687 #endif
 688 #include <pwd.h>
 689
 690 #define NOTOK (-1)
 691 #define OK 0
 692 #define DONE 1
 693
 694 char *progname;
 695 FILE *sfi;
 696 FILE *sfo;
 697 char ibuffer[BUFSIZ];
 698 char obuffer[BUFSIZ];
 699 char Errmsg[200];               /* POP errors, at least, can exceed
 700                                    the original length of 80.  */
 701
 702 /*
 703  * The full legal syntax for a POP mailbox specification for movemail
 704  * is "po:username:hostname".  The ":hostname" is optional; if it is
 705  * omitted, the MAILHOST environment variable will be consulted.  Note
 706  * that by the time popmail() is called the "po:" has been stripped
 707  * off of the front of the mailbox name.
 708  *
 709  * If the mailbox is in the form "po:username:hostname", then it is
 710  * modified by this function -- the second colon is replaced by a
 711  * null.
 712  *
 713  * Return a value suitable for passing to `exit'.
 714  */
 715
 716 int
 717 popmail (mailbox, outfile, preserve, password, reverse_order)
 718      char *mailbox;
 719      char *outfile;
 720      int preserve;
 721      char *password;
 722      int reverse_order;
 723 {
 724   int nmsgs, nbytes;
 725   register int i;
 726   int mbfi;
 727   FILE *mbf;
 728   char *getenv ();
 729   popserver server;
 730   int start, end, increment;
 731   char *user, *hostname;
 732
 733   user = mailbox;
 734   if ((hostname = index(mailbox, ':')))
 735     *hostname++ = '\0';
 736
 737   server = pop_open (hostname, user, password, POP_NO_GETPASS);
 738   if (! server)
 739     {
 740       error ("Error connecting to POP server: %s", pop_error, 0);
 741       return EXIT_FAILURE;
 742     }
 743
 744   if (pop_stat (server, &nmsgs, &nbytes))
 745     {
 746       error ("Error getting message count from POP server: %s", pop_error, 0);
 747       return EXIT_FAILURE;
 748     }
 749
 750   if (!nmsgs)
 751     {
 752       pop_close (server);
 753       return EXIT_SUCCESS;
 754     }
 755
 756   mbfi = open (outfile, O_WRONLY | O_CREAT | O_EXCL, 0666);
 757   if (mbfi < 0)
 758     {
 759       pop_close (server);
 760       error ("Error in open: %s, %s", strerror (errno), outfile);
 761       return EXIT_FAILURE;
 762     }
 763   fchown (mbfi, getuid (), -1);
 764
 765   if ((mbf = fdopen (mbfi, "wb")) == NULL)
 766     {
 767       pop_close (server);
 768       error ("Error in fdopen: %s", strerror (errno), 0);
 769       close (mbfi);
 770       unlink (outfile);
 771       return EXIT_FAILURE;
 772     }
 773
 774   if (reverse_order)
 775     {
 776       start = nmsgs;
 777       end = 1;
 778       increment = -1;
 779     }
 780   else
 781     {
 782       start = 1;
 783       end = nmsgs;
 784       increment = 1;
 785     }
 786
 787   for (i = start; i * increment <= end * increment; i += increment)
 788     {
 789       mbx_delimit_begin (mbf);
 790       if (pop_retr (server, i, mbf) != OK)
 791         {
 792           error ("%s", Errmsg, 0);
 793           close (mbfi);
 794           return EXIT_FAILURE;
 795         }
 796       mbx_delimit_end (mbf);
 797       fflush (mbf);
 798       if (ferror (mbf))
 799         {
 800           error ("Error in fflush: %s", strerror (errno), 0);
 801           pop_close (server);
 802           close (mbfi);
 803           return EXIT_FAILURE;
 804         }
 805     }
 806
 807   /* On AFS, a call to write only modifies the file in the local
 808    *     workstation's AFS cache.  The changes are not written to the server
 809    *      until a call to fsync or close is made.  Users with AFS home
 810    *      directories have lost mail when over quota because these checks were
 811    *      not made in previous versions of movemail. */
 812
 813 #ifdef BSD_SYSTEM
 814   if (fsync (mbfi) < 0)
 815     {
 816       error ("Error in fsync: %s", strerror (errno), 0);
 817       return EXIT_FAILURE;
 818     }
 819 #endif
 820
 821   if (close (mbfi) == -1)
 822     {
 823       error ("Error in close: %s", strerror (errno), 0);
 824       return EXIT_FAILURE;
 825     }
 826
 827   if (! preserve)
 828     for (i = 1; i <= nmsgs; i++)
 829       {
 830         if (pop_delete (server, i))
 831           {
 832             error ("Error from POP server: %s", pop_error, 0);
 833             pop_close (server);
 834             return EXIT_FAILURE;
 835           }
 836       }
 837
 838   if (pop_quit (server))
 839     {
 840       error ("Error from POP server: %s", pop_error, 0);
 841       return EXIT_FAILURE;
 842     }
 843
 844   return EXIT_SUCCESS;
 845 }
 846
 847 int
 848 pop_retr (server, msgno, arg)
 849      popserver server;
 850      int msgno;
 851      FILE *arg;
 852 {
 853   extern char *strerror ();
 854   char *line;
 855   int ret;
 856
 857   if (pop_retrieve_first (server, msgno, &line))
 858     {
 859       char *error = concat ("Error from POP server: ", pop_error, "");
 860       strncpy (Errmsg, error, sizeof (Errmsg));
 861       Errmsg[sizeof (Errmsg)-1] = '\0';
 862       free(error);
 863       return (NOTOK);
 864     }
 865
 866   while ((ret = pop_retrieve_next (server, &line)) >= 0)
 867     {
 868       if (! line)
 869         break;
 870
 871       if (mbx_write (line, ret, arg) != OK)
 872         {
 873           strcpy (Errmsg, strerror (errno));
 874           pop_close (server);
 875           return (NOTOK);
 876         }
 877     }
 878
 879   if (ret)
 880     {
 881       char *error = concat ("Error from POP server: ", pop_error, "");
 882       strncpy (Errmsg, error, sizeof (Errmsg));
 883       Errmsg[sizeof (Errmsg)-1] = '\0';
 884       free(error);
 885       return (NOTOK);
 886     }
 887
 888   return (OK);
 889 }
 890
 891 /* Do this as a macro instead of using strcmp to save on execution time. */
 892 #define IS_FROM_LINE(a) ((a[0] == 'F') \
 893                          && (a[1] == 'r') \
 894                          && (a[2] == 'o') \
 895                          && (a[3] == 'm') \
 896                          && (a[4] == ' '))
 897
 898 int
 899 mbx_write (line, len, mbf)
 900      char *line;
 901      int len;
 902      FILE *mbf;
 903 {
 904 #ifdef MOVEMAIL_QUOTE_POP_FROM_LINES
 905   if (IS_FROM_LINE (line))
 906     {
 907       if (fputc ('>', mbf) == EOF)
 908         return (NOTOK);
 909     }
 910 #endif
 911   if (line[0] == '\037')
 912     {
 913       if (fputs ("^_", mbf) == EOF)
 914         return (NOTOK);
 915       line++;
 916       len--;
 917     }
 918   if (fwrite (line, 1, len, mbf) != len)
 919     return (NOTOK);
 920   if (fputc (0x0a, mbf) == EOF)
 921     return (NOTOK);
 922   return (OK);
 923 }
 924
 925 int
 926 mbx_delimit_begin (mbf)
 927      FILE *mbf;
 928 {
 929   if (fputs ("\f\n0, unseen,,\n", mbf) == EOF)
 930     return (NOTOK);
 931   return (OK);
 932 }
 933
 934 int
 935 mbx_delimit_end (mbf)
 936      FILE *mbf;
 937 {
 938   if (putc ('\037', mbf) == EOF)
 939     return (NOTOK);
 940   return (OK);
 941 }
 942
 943 #endif /* MAIL_USE_POP */
 944 \f
 945 #ifndef HAVE_STRERROR
 946 char *
 947 strerror (errnum)
 948      int errnum;
 949 {
 950   extern char *sys_errlist[];
 951   extern int sys_nerr;
 952
 953   if (errnum >= 0 && errnum < sys_nerr)
 954     return sys_errlist[errnum];
 955   return (char *) "Unknown error";
 956 }
 957
 958 #endif /* ! HAVE_STRERROR */
 959
 960 /* arch-tag: 1c323112-41fe-4fe5-8de9-494de631f73f
 961    (do not change this comment) */
 962
 963 /* movemail.c ends here */