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., 51 Franklin Street, Fifth Floor,
  20 Boston, MA 02110-1301, 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 (EXIT_FAILURE);
 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 #ifdef MAIL_USE_POP
 232       fprintf (stderr, "Usage: movemail [-p] inbox destfile%s\n",
 233                " [POP-password]");
 234 #else
 235       fprintf (stderr, "Usage: movemail [-p] inbox destfile%s\n", "");
 236 #endif
 237       exit (EXIT_FAILURE);
 238     }
 239
 240   inname = argv[optind];
 241   outname = argv[optind+1];
 242
 243 #ifdef MAIL_USE_MMDF
 244   mmdf_init (argv[0]);
 245 #endif
 246
 247   if (*outname == 0)
 248     fatal ("Destination file name is empty", 0, 0);
 249
 250   /* Check access to output file.  */
 251   if (access (outname, F_OK) == 0 && access (outname, W_OK) != 0)
 252     pfatal_with_name (outname);
 253
 254   /* Also check that outname's directory is writable to the real uid.  */
 255   {
 256     char *buf = (char *) xmalloc (strlen (outname) + 1);
 257     char *p;
 258     strcpy (buf, outname);
 259     p = buf + strlen (buf);
 260     while (p > buf && !IS_DIRECTORY_SEP (p[-1]))
 261       *--p = 0;
 262     if (p == buf)
 263       *p++ = '.';
 264     if (access (buf, W_OK) != 0)
 265       pfatal_with_name (buf);
 266     free (buf);
 267   }
 268
 269 #ifdef MAIL_USE_POP
 270   if (!strncmp (inname, "po:", 3))
 271     {
 272       int status;
 273
 274       status = popmail (inname + 3, outname, preserve_mail,
 275                         (argc - optind == 3) ? argv[optind+2] : NULL,
 276                         pop_reverse_order);
 277       exit (status);
 278     }
 279
 280   setuid (getuid ());
 281 #endif /* MAIL_USE_POP */
 282
 283 #ifndef DISABLE_DIRECT_ACCESS
 284
 285   /* Check access to input file.  */
 286   if (access (inname, R_OK | W_OK) != 0)
 287     pfatal_with_name (inname);
 288
 289 #ifndef MAIL_USE_MMDF
 290 #ifndef MAIL_USE_SYSTEM_LOCK
 291 #ifdef MAIL_USE_MAILLOCK
 292   spool_name = mail_spool_name (inname);
 293   if (! spool_name)
 294 #endif
 295     {
 296       /* Use a lock file named after our first argument with .lock appended:
 297          If it exists, the mail file is locked.  */
 298       /* Note: this locking mechanism is *required* by the mailer
 299          (on systems which use it) to prevent loss of mail.
 300
 301          On systems that use a lock file, extracting the mail without locking
 302          WILL occasionally cause loss of mail due to timing errors!
 303
 304          So, if creation of the lock file fails
 305          due to access permission on the mail spool directory,
 306          you simply MUST change the permission
 307          and/or make movemail a setgid program
 308          so it can create lock files properly.
 309
 310          You might also wish to verify that your system is one
 311          which uses lock files for this purpose.  Some systems use other methods.
 312
 313          If your system uses the `flock' system call for mail locking,
 314          define MAIL_USE_SYSTEM_LOCK in config.h or the s-*.h file
 315          and recompile movemail.  If the s- file for your system
 316          should define MAIL_USE_SYSTEM_LOCK but does not, send a bug report
 317          to bug-gnu-emacs@prep.ai.mit.edu so we can fix it.  */
 318
 319       lockname = concat (inname, ".lock", "");
 320       tempname = (char *) xmalloc (strlen (inname) + strlen ("EXXXXXX") + 1);
 321       strcpy (tempname, inname);
 322       p = tempname + strlen (tempname);
 323       while (p != tempname && !IS_DIRECTORY_SEP (p[-1]))
 324         p--;
 325       *p = 0;
 326       strcpy (p, "EXXXXXX");
 327       mktemp (tempname);
 328       unlink (tempname);
 329
 330       while (1)
 331         {
 332           /* Create the lock file, but not under the lock file name.  */
 333           /* Give up if cannot do that.  */
 334           desc = open (tempname, O_WRONLY | O_CREAT | O_EXCL, 0666);
 335           if (desc < 0)
 336             {
 337               char *message = (char *) xmalloc (strlen (tempname) + 50);
 338               sprintf (message, "creating %s, which would become the lock file",
 339                        tempname);
 340               pfatal_with_name (message);
 341             }
 342           close (desc);
 343
 344           tem = link (tempname, lockname);
 345           unlink (tempname);
 346           if (tem >= 0)
 347             break;
 348           sleep (1);
 349
 350           /* If lock file is five minutes old, unlock it.
 351              Five minutes should be good enough to cope with crashes
 352              and wedgitude, and long enough to avoid being fooled
 353              by time differences between machines.  */
 354           if (stat (lockname, &st) >= 0)
 355             {
 356               now = time (0);
 357               if (st.st_ctime < now - 300)
 358                 unlink (lockname);
 359             }
 360         }
 361
 362       delete_lockname = lockname;
 363     }
 364 #endif /* not MAIL_USE_SYSTEM_LOCK */
 365 #endif /* not MAIL_USE_MMDF */
 366
 367   if (fork () == 0)
 368     {
 369       int lockcount = 0;
 370       int status = 0;
 371 #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK)
 372       long touched_lock, now;
 373 #endif
 374
 375       setuid (getuid ());
 376
 377 #ifndef MAIL_USE_MMDF
 378 #ifdef MAIL_USE_SYSTEM_LOCK
 379       indesc = open (inname, O_RDWR);
 380 #else  /* if not MAIL_USE_SYSTEM_LOCK */
 381       indesc = open (inname, O_RDONLY);
 382 #endif /* not MAIL_USE_SYSTEM_LOCK */
 383 #else  /* MAIL_USE_MMDF */
 384       indesc = lk_open (inname, O_RDONLY, 0, 0, 10);
 385 #endif /* MAIL_USE_MMDF */
 386
 387       if (indesc < 0)
 388         pfatal_with_name (inname);
 389
 390 #if defined (BSD_SYSTEM) || defined (XENIX)
 391       /* In case movemail is setuid to root, make sure the user can
 392          read the output file.  */
 393       /* This is desirable for all systems
 394          but I don't want to assume all have the umask system call */
 395       umask (umask (0) & 0333);
 396 #endif /* BSD_SYSTEM || XENIX */
 397       outdesc = open (outname, O_WRONLY | O_CREAT | O_EXCL, 0666);
 398       if (outdesc < 0)
 399         pfatal_with_name (outname);
 400
 401       /* This label exists so we can retry locking
 402          after a delay, if it got EAGAIN or EBUSY.  */
 403     retry_lock:
 404
 405       /* Try to lock it.  */
 406 #ifdef MAIL_USE_MAILLOCK
 407       if (spool_name)
 408         {
 409           /* The "0 - " is to make it a negative number if maillock returns
 410              non-zero. */
 411           status = 0 - maillock (spool_name, 1);
 412 #ifdef HAVE_TOUCHLOCK
 413           touched_lock = time (0);
 414 #endif
 415           lockcount = 5;
 416         }
 417       else
 418 #endif /* MAIL_USE_MAILLOCK */
 419         {
 420 #ifdef MAIL_USE_SYSTEM_LOCK
 421 #ifdef MAIL_USE_LOCKF
 422           status = lockf (indesc, F_LOCK, 0);
 423 #else /* not MAIL_USE_LOCKF */
 424 #ifdef XENIX
 425           status = locking (indesc, LK_RLCK, 0L);
 426 #else
 427 #ifdef WINDOWSNT
 428           status = locking (indesc, LK_RLCK, -1L);
 429 #else
 430           status = flock (indesc, LOCK_EX);
 431 #endif
 432 #endif
 433 #endif /* not MAIL_USE_LOCKF */
 434 #endif /* MAIL_USE_SYSTEM_LOCK */
 435         }
 436
 437       /* If it fails, retry up to 5 times
 438          for certain failure codes.  */
 439       if (status < 0)
 440         {
 441           if (++lockcount <= 5)
 442             {
 443 #ifdef EAGAIN
 444               if (errno == EAGAIN)
 445                 {
 446                   sleep (1);
 447                   goto retry_lock;
 448                 }
 449 #endif
 450 #ifdef EBUSY
 451               if (errno == EBUSY)
 452                 {
 453                   sleep (1);
 454                   goto retry_lock;
 455                 }
 456 #endif
 457             }
 458
 459           pfatal_with_name (inname);
 460         }
 461
 462       {
 463         char buf[1024];
 464
 465         while (1)
 466           {
 467             nread = read (indesc, buf, sizeof buf);
 468             if (nread != write (outdesc, buf, nread))
 469               {
 470                 int saved_errno = errno;
 471                 unlink (outname);
 472                 errno = saved_errno;
 473                 pfatal_with_name (outname);
 474               }
 475             if (nread < sizeof buf)
 476               break;
 477 #if defined (MAIL_USE_MAILLOCK) && defined (HAVE_TOUCHLOCK)
 478             if (spool_name)
 479               {
 480                 now = time (0);
 481                 if (now - touched_lock > 60)
 482                   {
 483                     touchlock ();
 484                     touched_lock = now;
 485                   }
 486               }
 487 #endif /* MAIL_USE_MAILLOCK */
 488           }
 489       }
 490
 491 #ifdef BSD_SYSTEM
 492       if (fsync (outdesc) < 0)
 493         pfatal_and_delete (outname);
 494 #endif
 495
 496       /* Check to make sure no errors before we zap the inbox.  */
 497       if (close (outdesc) != 0)
 498         pfatal_and_delete (outname);
 499
 500 #ifdef MAIL_USE_SYSTEM_LOCK
 501       if (! preserve_mail)
 502         {
 503 #if defined (STRIDE) || defined (XENIX)
 504           /* Stride, xenix have file locking, but no ftruncate.
 505              This mess will do. */
 506           close (open (inname, O_CREAT | O_TRUNC | O_RDWR, 0666));
 507 #else
 508           ftruncate (indesc, 0L);
 509 #endif /* STRIDE or XENIX */
 510         }
 511 #endif /* MAIL_USE_SYSTEM_LOCK */
 512
 513 #ifdef MAIL_USE_MMDF
 514       lk_close (indesc, 0, 0, 0);
 515 #else
 516       close (indesc);
 517 #endif
 518
 519 #ifndef MAIL_USE_SYSTEM_LOCK
 520       if (! preserve_mail)
 521         {
 522           /* Delete the input file; if we can't, at least get rid of its
 523              contents.  */
 524 #ifdef MAIL_UNLINK_SPOOL
 525           /* This is generally bad to do, because it destroys the permissions
 526              that were set on the file.  Better to just empty the file.  */
 527           if (unlink (inname) < 0 && errno != ENOENT)
 528 #endif /* MAIL_UNLINK_SPOOL */
 529             creat (inname, 0600);
 530         }
 531 #endif /* not MAIL_USE_SYSTEM_LOCK */
 532
 533 #ifdef MAIL_USE_MAILLOCK
 534       /* This has to occur in the child, i.e., in the process that
 535          acquired the lock! */
 536       if (spool_name)
 537         mailunlock ();
 538 #endif
 539       exit (EXIT_SUCCESS);
 540     }
 541
 542   wait (&status);
 543   if (!WIFEXITED (status))
 544     exit (EXIT_FAILURE);
 545   else if (WRETCODE (status) != 0)
 546     exit (WRETCODE (status));
 547
 548 #if !defined (MAIL_USE_MMDF) && !defined (MAIL_USE_SYSTEM_LOCK)
 549 #ifdef MAIL_USE_MAILLOCK
 550   if (! spool_name)
 551 #endif /* MAIL_USE_MAILLOCK */
 552     unlink (lockname);
 553 #endif /* not MAIL_USE_MMDF and not MAIL_USE_SYSTEM_LOCK */
 554
 555 #endif /* ! DISABLE_DIRECT_ACCESS */
 556
 557   return EXIT_SUCCESS;
 558 }
 559
 560 #ifdef MAIL_USE_MAILLOCK
 561 /* This function uses stat to confirm that the mail directory is
 562    identical to the directory of the input file, rather than just
 563    string-comparing the two paths, because one or both of them might
 564    be symbolic links pointing to some other directory. */
 565 static char *
 566 mail_spool_name (inname)
 567      char *inname;
 568 {
 569   struct stat stat1, stat2;
 570   char *indir, *fname;
 571   int status;
 572
 573   if (! (fname = rindex (inname, '/')))
 574     return NULL;
 575
 576   fname++;
 577
 578   if (stat (MAILDIR, &stat1) < 0)
 579     return NULL;
 580
 581   indir = (char *) xmalloc (fname - inname + 1);
 582   strncpy (indir, inname, fname - inname);
 583   indir[fname-inname] = '\0';
 584
 585
 586   status = stat (indir, &stat2);
 587
 588   free (indir);
 589
 590   if (status < 0)
 591     return NULL;
 592
 593   if (stat1.st_dev == stat2.st_dev
 594       && stat1.st_ino == stat2.st_ino)
 595     return fname;
 596
 597   return NULL;
 598 }
 599 #endif /* MAIL_USE_MAILLOCK */
 600 \f
 601 /* Print error message and exit.  */
 602
 603 void
 604 fatal (s1, s2, s3)
 605      char *s1, *s2, *s3;
 606 {
 607   if (delete_lockname)
 608     unlink (delete_lockname);
 609   error (s1, s2, s3);
 610   exit (EXIT_FAILURE);
 611 }
 612
 613 /* Print error message.  `s1' is printf control string, `s2' and `s3'
 614    are args for it or null. */
 615
 616 void
 617 error (s1, s2, s3)
 618      char *s1, *s2, *s3;
 619 {
 620   fprintf (stderr, "movemail: ");
 621   if (s3)
 622     fprintf (stderr, s1, s2, s3);
 623   else if (s2)
 624     fprintf (stderr, s1, s2);
 625   else
 626     fprintf (stderr, s1);
 627   fprintf (stderr, "\n");
 628 }
 629
 630 void
 631 pfatal_with_name (name)
 632      char *name;
 633 {
 634   fatal ("%s for %s", strerror (errno), name);
 635 }
 636
 637 void
 638 pfatal_and_delete (name)
 639      char *name;
 640 {
 641   char *s = strerror (errno);
 642   unlink (name);
 643   fatal ("%s for %s", s, name);
 644 }
 645
 646 /* Return a newly-allocated string whose contents concatenate those of s1, s2, s3.  */
 647
 648 char *
 649 concat (s1, s2, s3)
 650      char *s1, *s2, *s3;
 651 {
 652   int len1 = strlen (s1), len2 = strlen (s2), len3 = strlen (s3);
 653   char *result = (char *) xmalloc (len1 + len2 + len3 + 1);
 654
 655   strcpy (result, s1);
 656   strcpy (result + len1, s2);
 657   strcpy (result + len1 + len2, s3);
 658   *(result + len1 + len2 + len3) = 0;
 659
 660   return result;
 661 }
 662
 663 /* Like malloc but get fatal error if memory is exhausted.  */
 664
 665 long *
 666 xmalloc (size)
 667      unsigned size;
 668 {
 669   long *result = (long *) malloc (size);
 670   if (!result)
 671     fatal ("virtual memory exhausted", 0, 0);
 672   return result;
 673 }
 674 \f
 675 /* This is the guts of the interface to the Post Office Protocol.  */
 676
 677 #ifdef MAIL_USE_POP
 678
 679 #ifndef WINDOWSNT
 680 #include <sys/socket.h>
 681 #include <netinet/in.h>
 682 #include <netdb.h>
 683 #else
 684 #undef _WINSOCKAPI_
 685 #include <winsock.h>
 686 #endif
 687 #include <pwd.h>
 688
 689 #define NOTOK (-1)
 690 #define OK 0
 691 #define DONE 1
 692
 693 char *progname;
 694 FILE *sfi;
 695 FILE *sfo;
 696 char ibuffer[BUFSIZ];
 697 char obuffer[BUFSIZ];
 698 char Errmsg[200];               /* POP errors, at least, can exceed
 699                                    the original length of 80.  */
 700
 701 /*
 702  * The full legal syntax for a POP mailbox specification for movemail
 703  * is "po:username:hostname".  The ":hostname" is optional; if it is
 704  * omitted, the MAILHOST environment variable will be consulted.  Note
 705  * that by the time popmail() is called the "po:" has been stripped
 706  * off of the front of the mailbox name.
 707  *
 708  * If the mailbox is in the form "po:username:hostname", then it is
 709  * modified by this function -- the second colon is replaced by a
 710  * null.
 711  *
 712  * Return a value suitable for passing to `exit'.
 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 EXIT_FAILURE;
 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 EXIT_FAILURE;
 747     }
 748
 749   if (!nmsgs)
 750     {
 751       pop_close (server);
 752       return EXIT_SUCCESS;
 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 EXIT_FAILURE;
 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 EXIT_FAILURE;
 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 ("%s", Errmsg, 0);
 792           close (mbfi);
 793           return EXIT_FAILURE;
 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 EXIT_FAILURE;
 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 EXIT_FAILURE;
 817     }
 818 #endif
 819
 820   if (close (mbfi) == -1)
 821     {
 822       error ("Error in close: %s", strerror (errno), 0);
 823       return EXIT_FAILURE;
 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 EXIT_FAILURE;
 834           }
 835       }
 836
 837   if (pop_quit (server))
 838     {
 839       error ("Error from POP server: %s", pop_error, 0);
 840       return EXIT_FAILURE;
 841     }
 842
 843   return EXIT_SUCCESS;
 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 */
 958
 959 /* arch-tag: 1c323112-41fe-4fe5-8de9-494de631f73f
 960    (do not change this comment) */
 961
 962 /* movemail.c ends here */