diplodocus.org Git - nmh/blob - uip/inc.c

   1
   2 /*
   3  * inc.c -- incorporate messages from a maildrop into a folder
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #ifdef MAILGROUP
  11 /* Revised: Sat Apr 14 17:08:17 PDT 1990 (marvit@hplabs)
  12  *    Added hpux hacks to set and reset gid to be "mail" as needed. The reset
  13  *    is necessary so inc'ed mail is the group of the inc'er, rather than
  14  *    "mail". We setgid to egid only when [un]locking the mail file. This
  15  *    is also a major security precaution which will not be explained here.
  16  *
  17  * Fri Feb  7 16:04:57 PST 1992         John Romine <bug-mh@ics.uci.edu>
  18  *   NB: I'm not 100% sure that this setgid stuff is secure even now.
  19  *
  20  * See the *GROUPPRIVS() macros later. I'm reasonably happy with the setgid
  21  * attribute. Running setuid root is probably not a terribly good idea, though.
  22  *       -- Peter Maydell <pmaydell@chiark.greenend.org.uk>, 04/1998
  23  *
  24  * Peter Maydell's patch slightly modified for nmh 0.28-pre2.
  25  * Ruud de Rooij <ruud@debian.org>  Wed, 22 Jul 1998 13:24:22 +0200
  26  */
  27 #endif
  28
  29 #include <h/mh.h>
  30 #include <h/utils.h>
  31 #include <fcntl.h>
  32
  33 #include <h/dropsbr.h>
  34 #include <h/popsbr.h>
  35 #include <h/fmt_scan.h>
  36 #include <h/scansbr.h>
  37 #include <h/signals.h>
  38 #include <h/tws.h>
  39 #include <h/mts.h>
  40 #include <signal.h>
  41
  42 #ifndef CYRUS_SASL
  43 # define SASLminc(a) (a)
  44 #else
  45 # define SASLminc(a)  0
  46 #endif
  47
  48 #define INC_SWITCHES \
  49     X("audit audit-file", 0, AUDSW) \
  50     X("noaudit", 0, NAUDSW) \
  51     X("changecur", 0, CHGSW) \
  52     X("nochangecur", 0, NCHGSW) \
  53     X("file name", 0, FILESW) \
  54     X("form formatfile", 0, FORMSW) \
  55     X("format string", 5, FMTSW) \
  56     X("host hostname", 0, HOSTSW) \
  57     X("user username", 0, USERSW) \
  58     X("pack file", 0, PACKSW) \
  59     X("nopack", 0, NPACKSW) \
  60     X("port name/number", 0, PORTSW) \
  61     X("silent", 0, SILSW) \
  62     X("nosilent", 0, NSILSW) \
  63     X("truncate", 0, TRNCSW) \
  64     X("notruncate", 0, NTRNCSW) \
  65     X("width columns", 0, WIDTHSW) \
  66     X("version", 0, VERSIONSW) \
  67     X("help", 0, HELPSW) \
  68     X("snoop", -5, SNOOPSW) \
  69     X("sasl", SASLminc(-4), SASLSW) \
  70     X("nosasl", SASLminc(-6), NOSASLSW) \
  71     X("saslmech", SASLminc(-8), SASLMECHSW) \
  72     X("proxy command", 0, PROXYSW) \
  73
  74 #define X(sw, minchars, id) id,
  75 DEFINE_SWITCH_ENUM(INC);
  76 #undef X
  77
  78 #define X(sw, minchars, id) { sw, minchars, id },
  79 DEFINE_SWITCH_ARRAY(INC, switches);
  80 #undef X
  81
  82 /*
  83  * flags for the mail source
  84  */
  85 #define INC_FILE  0
  86 #define INC_POP   1
  87
  88 static int inc_type;
  89 static struct Maildir_entry {
  90         char *filename;
  91         time_t mtime;
  92 } *Maildir = NULL;
  93 static int num_maildir_entries = 0;
  94 static int snoop = 0;
  95
  96 extern char response[];
  97
  98 static int size;
  99 static long pos;
 100
 101 static int mbx_style = MMDF_FORMAT;
 102 static int pd = NOTOK;
 103
 104 static long start;
 105 static long stop;
 106
 107 static char *packfile = NULL;
 108 static FILE *pf = NULL;
 109
 110 /* This is an attempt to simplify things by putting all the
 111  * privilege ops into macros.
 112  * *GROUPPRIVS() is related to handling the setgid MAIL property,
 113  * and only applies if MAILGROUP is defined.
 114  * Basically, SAVEGROUPPRIVS() is called right at the top of main()
 115  * to initialise things, and then DROPGROUPPRIVS() and GETGROUPPRIVS()
 116  * do the obvious thing.
 117  *
 118  * There's probably a better implementation if we're allowed to use
 119  * BSD-style setreuid() rather than using POSIX saved-ids.
 120  * Anyway, if you're euid root it's a bit pointless to drop the group
 121  * permissions...
 122  *
 123  * I'm pretty happy that the security is good provided we aren't setuid root.
 124  * The only things we trust with group=mail privilege are lkfopen()
 125  * and lkfclose().
 126  */
 127
 128 /*
 129  * For setting and returning to "mail" gid
 130  */
 131 #ifdef MAILGROUP
 132 static int return_gid;
 133 #define TRYDROPGROUPPRIVS() DROPGROUPPRIVS()
 134 #define DROPGROUPPRIVS() setgid(getgid())
 135 #define GETGROUPPRIVS() setgid(return_gid)
 136 #define SAVEGROUPPRIVS() return_gid = getegid()
 137 #else
 138 /* define *GROUPPRIVS() as null; this avoids having lots of "#ifdef MAILGROUP"s */
 139 #define TRYDROPGROUPPRIVS()
 140 #define DROPGROUPPRIVS()
 141 #define GETGROUPPRIVS()
 142 #define SAVEGROUPPRIVS()
 143 #endif /* not MAILGROUP */
 144
 145 /* these variables have to be globals so that done() can correctly clean up the lockfile */
 146 static int locked = 0;
 147 static char *newmail;
 148 static FILE *in;
 149
 150 /*
 151  * prototypes
 152  */
 153 char *map_name(char *);
 154
 155 static void inc_done(int) NORETURN;
 156 static int pop_action(char *);
 157 static int pop_pack(char *);
 158 static int map_count(void);
 159
 160 int
 161 maildir_srt(const void *va, const void *vb)
 162 {
 163     const struct Maildir_entry *a = va, *b = vb;
 164     if (a->mtime > b->mtime)
 165       return 1;
 166     else if (a->mtime < b->mtime)
 167       return -1;
 168     else
 169       return 0;
 170 }
 171
 172 int
 173 main (int argc, char **argv)
 174 {
 175     int chgflag = 1, trnflag = 1;
 176     int noisy = 1, width = 0;
 177     int hghnum = 0, msgnum = 0;
 178     int sasl = 0;
 179     int incerr = 0; /* <0 if inc hits an error which means it should not truncate mailspool */
 180     char *cp, *maildir = NULL, *folder = NULL;
 181     char *format = NULL, *form = NULL;
 182     char *host = NULL, *port = NULL, *user = NULL, *proxy = NULL;
 183     char *audfile = NULL, *from = NULL, *saslmech = NULL;
 184     char buf[BUFSIZ], **argp, *nfs, **arguments;
 185     struct msgs *mp = NULL;
 186     struct stat st, s1;
 187     FILE *aud = NULL;
 188     char b[PATH_MAX + 1];
 189     char *maildir_copy = NULL;  /* copy of mail directory because the static gets overwritten */
 190
 191     int nmsgs, nbytes;
 192     char *MAILHOST_env_variable;
 193
 194     done=inc_done;
 195
 196 /* absolutely the first thing we do is save our privileges,
 197  * and drop them if we can.
 198  */
 199     SAVEGROUPPRIVS();
 200     TRYDROPGROUPPRIVS();
 201
 202 #ifdef LOCALE
 203     setlocale(LC_ALL, "");
 204 #endif
 205     invo_name = r1bindex (argv[0], '/');
 206
 207     /* read user profile/context */
 208     context_read();
 209
 210     mts_init (invo_name);
 211     arguments = getarguments (invo_name, argc, argv, 1);
 212     argp = arguments;
 213
 214     /*
 215      * Scheme is:
 216      *        use MAILHOST environment variable if present,
 217      *  else try Hesiod.
 218      *  If that fails, use the default (if any)
 219      *  provided by mts.conf in mts_init()
 220      */
 221     if ((MAILHOST_env_variable = getenv("MAILHOST")) != NULL)
 222         pophost = MAILHOST_env_variable;
 223     /*
 224      * If there is a valid "pophost" entry in mts.conf,
 225      * then use it as the default host.
 226      */
 227     if (pophost && *pophost)
 228         host = pophost;
 229
 230     while ((cp = *argp++)) {
 231         if (*cp == '-') {
 232             switch (smatch (++cp, switches)) {
 233             case AMBIGSW:
 234                 ambigsw (cp, switches);
 235                 done (1);
 236             case UNKWNSW:
 237                 adios (NULL, "-%s unknown", cp);
 238
 239             case HELPSW:
 240                 snprintf (buf, sizeof(buf), "%s [+folder] [switches]", invo_name);
 241                 print_help (buf, switches, 1);
 242                 done (0);
 243             case VERSIONSW:
 244                 print_version(invo_name);
 245                 done (0);
 246
 247             case AUDSW:
 248                 if (!(cp = *argp++) || *cp == '-')
 249                     adios (NULL, "missing argument to %s", argp[-2]);
 250                 audfile = getcpy (m_maildir (cp));
 251                 continue;
 252             case NAUDSW:
 253                 audfile = NULL;
 254                 continue;
 255
 256             case CHGSW:
 257                 chgflag++;
 258                 continue;
 259             case NCHGSW:
 260                 chgflag = 0;
 261                 continue;
 262
 263             /*
 264              * The flag `trnflag' has the value:
 265              *
 266              * 2 if -truncate is given
 267              * 1 by default (truncating is default)
 268              * 0 if -notruncate is given
 269              */
 270             case TRNCSW:
 271                 trnflag = 2;
 272                 continue;
 273             case NTRNCSW:
 274                 trnflag = 0;
 275                 continue;
 276
 277             case FILESW:
 278                 if (!(cp = *argp++) || *cp == '-')
 279                     adios (NULL, "missing argument to %s", argp[-2]);
 280                 from = path (cp, TFILE);
 281
 282                 /*
 283                  * If the truncate file is in default state,
 284                  * change to not truncate.
 285                  */
 286                 if (trnflag == 1)
 287                     trnflag = 0;
 288                 continue;
 289
 290             case SILSW:
 291                 noisy = 0;
 292                 continue;
 293             case NSILSW:
 294                 noisy++;
 295                 continue;
 296
 297             case FORMSW:
 298                 if (!(form = *argp++) || *form == '-')
 299                     adios (NULL, "missing argument to %s", argp[-2]);
 300                 format = NULL;
 301                 continue;
 302             case FMTSW:
 303                 if (!(format = *argp++) || *format == '-')
 304                     adios (NULL, "missing argument to %s", argp[-2]);
 305                 form = NULL;
 306                 continue;
 307
 308             case WIDTHSW:
 309                 if (!(cp = *argp++) || *cp == '-')
 310                     adios (NULL, "missing argument to %s", argp[-2]);
 311                 width = atoi (cp);
 312                 continue;
 313
 314             case HOSTSW:
 315                 if (!(host = *argp++) || *host == '-')
 316                     adios (NULL, "missing argument to %s", argp[-2]);
 317                 continue;
 318
 319             case PORTSW:
 320                 if (!(port = *argp++) || *port == '-')
 321                     adios (NULL, "missing argument to %s", argp[-2]);
 322                 continue;
 323
 324             case USERSW:
 325                 if (!(user = *argp++) || *user == '-')
 326                     adios (NULL, "missing argument to %s", argp[-2]);
 327                 continue;
 328
 329             case PACKSW:
 330                 if (!(packfile = *argp++) || *packfile == '-')
 331                     adios (NULL, "missing argument to %s", argp[-2]);
 332                 continue;
 333             case NPACKSW:
 334                 packfile = NULL;
 335                 continue;
 336
 337             case SNOOPSW:
 338                 snoop++;
 339                 continue;
 340
 341             case SASLSW:
 342                 sasl++;
 343                 continue;
 344             case NOSASLSW:
 345                 sasl = 0;
 346                 continue;
 347
 348             case SASLMECHSW:
 349                 if (!(saslmech = *argp++) || *saslmech == '-')
 350                     adios (NULL, "missing argument to %s", argp[-2]);
 351                 continue;
 352             case PROXYSW:
 353                 if (!(proxy = *argp++) || *proxy == '-')
 354                     adios (NULL, "missing argument to %s", argp[-2]);
 355                 continue;
 356             }
 357         }
 358         if (*cp == '+' || *cp == '@') {
 359             if (folder)
 360                 adios (NULL, "only one folder at a time!");
 361             else
 362                 folder = pluspath (cp);
 363         } else {
 364             adios (NULL, "usage: %s [+folder] [switches]", invo_name);
 365         }
 366     }
 367
 368     /* NOTE: above this point you should use TRYDROPGROUPPRIVS(),
 369      * not DROPGROUPPRIVS().
 370      */
 371     if (host && !*host)
 372         host = NULL;
 373
 374     /* guarantee dropping group priveleges; we might not have done so earlier */
 375     DROPGROUPPRIVS();
 376
 377     /*
 378      * Where are we getting the new mail?
 379      */
 380     if (from)
 381         inc_type = INC_FILE;
 382     else if (host)
 383         inc_type = INC_POP;
 384     else
 385         inc_type = INC_FILE;
 386
 387     /*
 388      * Are we getting the mail from
 389      * a POP server?
 390      */
 391     if (inc_type == INC_POP) {
 392         struct nmh_creds creds = { 0, 0, 0 };
 393
 394         /*
 395          * initialize POP connection
 396          */
 397         nmh_get_credentials (host, user, sasl, &creds);
 398         if (pop_init (host, port, creds.user, creds.password, proxy, snoop,
 399                       sasl, saslmech) == NOTOK)
 400             adios (NULL, "%s", response);
 401
 402         /* Check if there are any messages */
 403         if (pop_stat (&nmsgs, &nbytes) == NOTOK)
 404             adios (NULL, "%s", response);
 405
 406         if (nmsgs == 0) {
 407             pop_quit();
 408             adios (NULL, "no mail to incorporate");
 409         }
 410     }
 411
 412     /*
 413      * We will get the mail from a file
 414      * (typically the standard maildrop)
 415      */
 416
 417     if (inc_type == INC_FILE) {
 418         if (from)
 419             newmail = from;
 420         else if ((newmail = getenv ("MAILDROP")) && *newmail)
 421             newmail = m_mailpath (newmail);
 422         else if ((newmail = context_find ("maildrop")) && *newmail)
 423             newmail = m_mailpath (newmail);
 424         else {
 425             newmail = concat (MAILDIR, "/", MAILFIL, NULL);
 426         }
 427         if (stat (newmail, &s1) == NOTOK || s1.st_size == 0)
 428             adios (NULL, "no mail to incorporate");
 429         if (s1.st_mode & S_IFDIR) {
 430             DIR *md;
 431             struct dirent *de;
 432             struct stat ms;
 433             int i;
 434             i = 0;
 435             cp = concat (newmail, "/new", NULL);
 436             if ((md = opendir(cp)) == NULL)
 437                 adios (NULL, "unable to open %s", cp);
 438             while ((de = readdir (md)) != NULL) {
 439                 if (de->d_name[0] == '.')
 440                     continue;
 441                 if (i >= num_maildir_entries) {
 442                     if ((Maildir = realloc(Maildir, sizeof(*Maildir) * (2*i+16))) == NULL)
 443                         adios(NULL, "not enough memory for %d messages", 2*i+16);
 444                     num_maildir_entries = 2*i+16;
 445                 }
 446                 Maildir[i].filename = concat (cp, "/", de->d_name, NULL);
 447                 if (stat(Maildir[i].filename, &ms) != 0)
 448                    adios (Maildir[i].filename, "couldn't get delivery time");
 449                 Maildir[i].mtime = ms.st_mtime;
 450                 i++;
 451             }
 452             free (cp);
 453             closedir (md);
 454             cp = concat (newmail, "/cur", NULL);
 455             if ((md = opendir(cp)) == NULL)
 456                 adios (NULL, "unable to open %s", cp);
 457             while ((de = readdir (md)) != NULL) {
 458                 if (de->d_name[0] == '.')
 459                     continue;
 460                 if (i >= num_maildir_entries) {
 461                     if ((Maildir = realloc(Maildir, sizeof(*Maildir) * (2*i+16))) == NULL)
 462                         adios(NULL, "not enough memory for %d messages", 2*i+16);
 463                     num_maildir_entries = 2*i+16;
 464                 }
 465                 Maildir[i].filename = concat (cp, "/", de->d_name, NULL);
 466                 if (stat(Maildir[i].filename, &ms) != 0)
 467                    adios (Maildir[i].filename, "couldn't get delivery time");
 468                 Maildir[i].mtime = ms.st_mtime;
 469                 i++;
 470             }
 471             free (cp);
 472             closedir (md);
 473             if (i == 0)
 474                 adios (NULL, "no mail to incorporate");
 475             num_maildir_entries = i;
 476             qsort (Maildir, num_maildir_entries, sizeof(*Maildir), maildir_srt);
 477         }
 478
 479         if ((cp = strdup(newmail)) == (char *)0)
 480             adios (NULL, "error allocating memory to copy newmail");
 481
 482         newmail = cp;
 483     }
 484
 485     /* skip the folder setup */
 486     if ((inc_type == INC_POP) && packfile)
 487         goto go_to_it;
 488
 489     if (!context_find ("path"))
 490         free (path ("./", TFOLDER));
 491     if (!folder)
 492         folder = getfolder (0);
 493     maildir = m_maildir (folder);
 494
 495     if ((maildir_copy = strdup(maildir)) == (char *)0)
 496         adios (maildir, "error allocating memory to copy maildir");
 497
 498     if (!folder_exists(maildir)) {
 499         /* If the folder doesn't exist, and we're given the -silent flag,
 500          * just fail.
 501          */
 502         if (noisy)
 503             create_folder(maildir, 0, done);
 504         else
 505             done (1);
 506     }
 507
 508     if (chdir (maildir) == NOTOK)
 509         adios (maildir, "unable to change directory to");
 510
 511     /* read folder and create message structure */
 512     if (!(mp = folder_read (folder, 0)))
 513         adios (NULL, "unable to read folder %s", folder);
 514
 515 go_to_it:
 516
 517     if (inc_type == INC_FILE && Maildir == NULL) {
 518         if (access (newmail, W_OK) != NOTOK) {
 519             locked++;
 520             if (trnflag) {
 521                 SIGNAL (SIGHUP, SIG_IGN);
 522                 SIGNAL (SIGINT, SIG_IGN);
 523                 SIGNAL (SIGQUIT, SIG_IGN);
 524                 SIGNAL (SIGTERM, SIG_IGN);
 525             }
 526
 527             GETGROUPPRIVS();       /* Reset gid to lock mail file */
 528             in = lkfopenspool (newmail, "r");
 529             DROPGROUPPRIVS();
 530             if (in == NULL)
 531                 adios (NULL, "unable to lock and fopen %s", newmail);
 532             fstat (fileno(in), &s1);
 533         } else {
 534             trnflag = 0;
 535             if ((in = fopen (newmail, "r")) == NULL)
 536                 adios (newmail, "unable to read");
 537         }
 538     }
 539
 540     /* This shouldn't be necessary but it can't hurt. */
 541     DROPGROUPPRIVS();
 542
 543     if (audfile) {
 544         int i;
 545         if ((i = stat (audfile, &st)) == NOTOK)
 546             advise (NULL, "Creating Receive-Audit: %s", audfile);
 547         if ((aud = fopen (audfile, "a")) == NULL)
 548             adios (audfile, "unable to append to");
 549         else if (i == NOTOK)
 550             chmod (audfile, m_gmprot ());
 551
 552         fprintf (aud, from ? "<<inc>> %s -ms %s\n"
 553                  : host ? "<<inc>> %s -host %s -user %s\n"
 554                  : "<<inc>> %s\n",
 555                  dtimenow (0), from ? from : host, user);
 556     }
 557
 558     /* Get new format string */
 559     nfs = new_fs (form, format, FORMAT);
 560
 561     if (noisy) {
 562         printf ("Incorporating new mail into %s...\n\n", folder);
 563         fflush (stdout);
 564     }
 565
 566
 567     /*
 568      * Get the mail from a POP server
 569      */
 570     if (inc_type == INC_POP) {
 571         int i;
 572         if (packfile) {
 573             packfile = path (packfile, TFILE);
 574             if (stat (packfile, &st) == NOTOK) {
 575                 if (errno != ENOENT)
 576                     adios (packfile, "error on file");
 577                 cp = concat ("Create file \"", packfile, "\"? ", NULL);
 578                 if (noisy && !getanswer (cp))
 579                     done (1);
 580                 free (cp);
 581             }
 582             msgnum = map_count ();
 583             if ((pd = mbx_open (packfile, mbx_style, getuid(), getgid(), m_gmprot()))
 584                 == NOTOK)
 585                 adios (packfile, "unable to open");
 586             if ((pf = fdopen (pd, "w+")) == NULL)
 587                 adios (NULL, "unable to fdopen %s", packfile);
 588         } else {
 589             hghnum = msgnum = mp->hghmsg;
 590         }
 591
 592         for (i = 1; i <= nmsgs; i++) {
 593             msgnum++;
 594             if (packfile) {
 595                 fseek (pf, 0L, SEEK_CUR);
 596                 pos = ftell (pf);
 597                 size = 0;
 598                 fwrite (mmdlm1, 1, strlen (mmdlm1), pf);
 599                 start = ftell (pf);
 600
 601                 if (pop_retr (i, pop_pack) == NOTOK)
 602                     adios (NULL, "%s", response);
 603
 604                 fseek (pf, 0L, SEEK_CUR);
 605                 stop = ftell (pf);
 606                 if (fflush (pf))
 607                     adios (packfile, "write error on");
 608                 fseek (pf, start, SEEK_SET);
 609             } else {
 610                 cp = getcpy (m_name (msgnum));
 611                 if ((pf = fopen (cp, "w+")) == NULL)
 612                     adios (cp, "unable to write");
 613                 chmod (cp, m_gmprot ());
 614                 start = stop = 0L;
 615
 616                 if (pop_retr (i, pop_action) == NOTOK)
 617                     adios (NULL, "%s", response);
 618
 619                 if (fflush (pf))
 620                     adios (cp, "write error on");
 621                 fseek (pf, 0L, SEEK_SET);
 622             }
 623             switch (incerr = scan (pf, msgnum, 0, nfs, width,
 624                               packfile ? 0 : msgnum == mp->hghmsg + 1 && chgflag,
 625                               1, NULL, stop - start, noisy)) {
 626             case SCNEOF:
 627                 printf ("%*d  empty\n", DMAXFOLDER, msgnum);
 628                 break;
 629
 630             case SCNFAT:
 631                 trnflag = 0;
 632                 noisy++;
 633                 /* advise (cp, "unable to read"); already advised */
 634                 /* fall thru */
 635
 636             case SCNERR:
 637             case SCNNUM:
 638                 break;
 639
 640             case SCNMSG:
 641             case SCNENC:
 642             default:
 643                 if (aud)
 644                     fputs (scanl, aud);
 645                 if (noisy)
 646                     fflush (stdout);
 647                 break;
 648             }
 649             if (packfile) {
 650                 fseek (pf, stop, SEEK_SET);
 651                 fwrite (mmdlm2, 1, strlen (mmdlm2), pf);
 652                 if (fflush (pf) || ferror (pf)) {
 653                     int e = errno;
 654                     pop_quit ();
 655                     errno = e;
 656                     adios (packfile, "write error on");
 657                 }
 658                 map_write (packfile, pd, 0, 0L, start, stop, pos, size, noisy);
 659             } else {
 660                 if (ferror(pf) || fclose (pf)) {
 661                     int e = errno;
 662                     unlink (cp);
 663                     pop_quit ();
 664                     errno = e;
 665                     adios (cp, "write error on");
 666                 }
 667                 free (cp);
 668             }
 669
 670             if (trnflag && pop_dele (i) == NOTOK)
 671                 adios (NULL, "%s", response);
 672         }
 673
 674         if (pop_quit () == NOTOK)
 675             adios (NULL, "%s", response);
 676         if (packfile) {
 677             mbx_close (packfile, pd);
 678             pd = NOTOK;
 679         }
 680     }
 681
 682     /*
 683      * Get the mail from file (usually mail spool)
 684      */
 685     if (inc_type == INC_FILE && Maildir == NULL) {
 686         scan_detect_mbox_style (in);            /* the MAGIC invocation... */
 687         hghnum = msgnum = mp->hghmsg;
 688         for (;;) {
 689             /* create scanline for new message */
 690             switch (incerr = scan (in, msgnum + 1, msgnum + 1, nfs, width,
 691                               msgnum == hghnum && chgflag, 1, NULL, 0L, noisy)) {
 692             case SCNFAT:
 693             case SCNEOF:
 694                 break;
 695
 696             case SCNERR:
 697                 if (aud)
 698                     fputs ("inc aborted!\n", aud);
 699                 advise (NULL, "aborted!");      /* doesn't clean up locks! */
 700                 break;
 701
 702             case SCNNUM:
 703                 advise (NULL, "BUG in %s, number out of range", invo_name);
 704                 break;
 705
 706             default:
 707                 advise (NULL, "BUG in %s, scan() botch (%d)", invo_name, incerr);
 708                 break;
 709
 710             case SCNMSG:
 711             case SCNENC:
 712                 /*
 713                  *  Run the external program hook on the message.
 714                  */
 715
 716                 (void)snprintf(b, sizeof (b), "%s/%d", maildir_copy, msgnum + 1);
 717                 (void)ext_hook("add-hook", b, (char *)0);
 718
 719                 if (aud)
 720                     fputs (scanl, aud);
 721                 if (noisy)
 722                     fflush (stdout);
 723
 724                 msgnum++;
 725                 continue;
 726             }
 727             /* If we get here there was some sort of error from scan(),
 728              * so stop processing anything more from the spool.
 729              */
 730             break;
 731         }
 732     } else if (inc_type == INC_FILE) { /* Maildir inbox to process */
 733         char *sp;
 734         FILE *sf;
 735         int i;
 736
 737         hghnum = msgnum = mp->hghmsg;
 738         for (i = 0; i < num_maildir_entries; i++) {
 739             msgnum++;
 740
 741             sp = Maildir[i].filename;
 742             cp = getcpy (m_name (msgnum));
 743             pf = NULL;
 744             if (!trnflag || link(sp, cp) == -1) {
 745                 static char buf[65536];
 746                 size_t nrd;
 747
 748                 if ((sf = fopen (sp, "r")) == NULL)
 749                     adios (sp, "unable to read for copy");
 750                 if ((pf = fopen (cp, "w+")) == NULL)
 751                     adios (cp, "unable to write for copy");
 752                 while ((nrd = fread(buf, 1, sizeof(buf), sf)) > 0)
 753                     if (fwrite(buf, 1, nrd, pf) != nrd)
 754                         break;
 755                 if (ferror(sf) || fflush(pf) || ferror(pf)) {
 756                         int e = errno;
 757                         fclose(pf); fclose(sf); unlink(cp);
 758                         errno = e;
 759                         adios(cp, "copy error %s -> %s", sp, cp);
 760                 }
 761                 fclose (sf);
 762                 sf = NULL;
 763             }
 764             if (pf == NULL && (pf = fopen (cp, "r")) == NULL)
 765                 adios (cp, "not available");
 766             chmod (cp, m_gmprot ());
 767
 768             fseek (pf, 0L, SEEK_SET);
 769             switch (incerr = scan (pf, msgnum, 0, nfs, width,
 770                               msgnum == mp->hghmsg + 1 && chgflag,
 771                               1, NULL, stop - start, noisy)) {
 772             case SCNEOF:
 773                 printf ("%*d  empty\n", DMAXFOLDER, msgnum);
 774                 break;
 775
 776             case SCNFAT:
 777                 trnflag = 0;
 778                 noisy++;
 779                 /* advise (cp, "unable to read"); already advised */
 780                 /* fall thru */
 781
 782             case SCNERR:
 783             case SCNNUM:
 784                 break;
 785
 786             case SCNMSG:
 787             case SCNENC:
 788             default:
 789                 /*
 790                  *  Run the external program hook on the message.
 791                  */
 792
 793                 (void)snprintf(b, sizeof (b), "%s/%d", maildir_copy, msgnum + 1);
 794                 (void)ext_hook("add-hook", b, (char *)0);
 795
 796                 if (aud)
 797                     fputs (scanl, aud);
 798                 if (noisy)
 799                     fflush (stdout);
 800                 break;
 801             }
 802             if (ferror(pf) || fclose (pf)) {
 803                 int e = errno;
 804                 unlink (cp);
 805                 errno = e;
 806                 adios (cp, "write error on");
 807             }
 808             pf = NULL;
 809             free (cp);
 810
 811             if (trnflag && unlink (sp) == NOTOK)
 812                 adios (sp, "couldn't unlink");
 813             free (sp); /* Free Maildir[i]->filename */
 814         }
 815         free (Maildir); /* From now on Maildir is just a flag - don't dref! */
 816     }
 817
 818     scan_finished ();
 819
 820     if (incerr < 0) {           /* error */
 821         if (locked) {
 822             GETGROUPPRIVS();      /* Be sure we can unlock mail file */
 823             (void) lkfclosespool (in, newmail); in = NULL;
 824             DROPGROUPPRIVS();    /* And then return us to normal privileges */
 825         } else {
 826             fclose (in); in = NULL;
 827         }
 828         adios (NULL, "failed");
 829     }
 830
 831     if (aud)
 832         fclose (aud);
 833
 834     if (noisy)
 835         fflush (stdout);
 836
 837     if ((inc_type == INC_POP) && packfile)
 838         done (0);
 839
 840     /*
 841      * truncate file we are incorporating from
 842      */
 843     if (inc_type == INC_FILE && Maildir == NULL) {
 844         if (trnflag) {
 845             if (stat (newmail, &st) != NOTOK && s1.st_mtime != st.st_mtime)
 846                 advise (NULL, "new messages have arrived!\007");
 847             else {
 848                 int newfd;
 849                 if ((newfd = creat (newmail, 0600)) != NOTOK)
 850                     close (newfd);
 851                 else
 852                     admonish (newmail, "error zero'ing");
 853                 unlink(map_name(newmail));
 854             }
 855         } else {
 856             if (noisy)
 857                 printf ("%s not zero'd\n", newmail);
 858         }
 859     }
 860
 861     if (msgnum == hghnum) {
 862         admonish (NULL, "no messages incorporated");
 863     } else {
 864         /*
 865          * Lock the sequence file now, and loop to set the right flags
 866          * in the folder structure
 867          */
 868
 869         struct msgs *mp2;
 870         int i;
 871
 872         context_replace (pfolder, folder);      /* update current folder */
 873
 874         if ((mp2 = folder_read(folder, 1)) == NULL) {
 875             admonish(NULL, "Unable to reread folder %s", folder);
 876             goto skip;
 877         }
 878
 879         /*
 880          * Shouldn't happen, but just in case ...
 881          */
 882
 883         if (msgnum >= mp2->hghoff
 884                 && !(mp2 = folder_realloc (mp2, mp2->lowoff, msgnum + 1))) {
 885             advise (NULL, "unable to reallocate folder storage");
 886             goto skip;
 887         }
 888
 889         if (chgflag)
 890             mp2->curmsg = hghnum + 1;
 891         mp2->hghmsg = msgnum;
 892
 893         if (mp2->lowmsg == 0)
 894             mp2->lowmsg = 1;
 895         if (chgflag)            /* sigh... */
 896             seq_setcur (mp2, mp2->curmsg);
 897
 898         for (i = hghnum + 1; i <= msgnum; i++) {
 899             clear_msg_flags (mp2, i);
 900             set_exists (mp2, i);
 901             set_unseen (mp2, i);
 902         }
 903         mp2->msgflags |= SEQMOD;
 904         seq_setunseen(mp2, 0);  /* Set the Unseen-Sequence */
 905         seq_save(mp2);          /* Save the sequence file */
 906         folder_free(mp2);
 907     }
 908 skip:
 909
 910     /*
 911      * unlock the mail spool
 912      */
 913     if (inc_type == INC_FILE && Maildir == NULL) {
 914         if (locked) {
 915            GETGROUPPRIVS();        /* Be sure we can unlock mail file */
 916            (void) lkfclosespool (in, newmail); in = NULL;
 917            DROPGROUPPRIVS();       /* And then return us to normal privileges */
 918         } else {
 919             fclose (in); in = NULL;
 920         }
 921     }
 922
 923     context_save ();            /* save the context file   */
 924     done (0);
 925     return 1;
 926 }
 927
 928
 929 static void
 930 inc_done (int status)
 931 {
 932     if (packfile && pd != NOTOK)
 933         mbx_close (packfile, pd);
 934     if (locked)
 935     {
 936         GETGROUPPRIVS();
 937         lkfclosespool(in, newmail);
 938         DROPGROUPPRIVS();
 939     }
 940     exit (status);
 941 }
 942
 943 static int
 944 pop_action (char *s)
 945 {
 946     fprintf (pf, "%s\n", s);
 947     stop += strlen (s) + 1;
 948     return 0;  /* Is return value used?  This was missing before 1999-07-15. */
 949 }
 950
 951 static int
 952 pop_pack (char *s)
 953 {
 954     int j;
 955     char buffer[BUFSIZ];
 956
 957     snprintf (buffer, sizeof(buffer), "%s\n", s);
 958     for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
 959         continue;
 960     for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
 961         continue;
 962     fputs (buffer, pf);
 963     size += strlen (buffer) + 1;
 964     return 0;  /* Is return value used?  This was missing before 1999-07-15. */
 965 }
 966
 967 static int
 968 map_count (void)
 969 {
 970     int md;
 971     char *cp;
 972     struct drop d;
 973     struct stat st;
 974
 975     if (stat (packfile, &st) == NOTOK)
 976         return 0;
 977     if ((md = open (cp = map_name (packfile), O_RDONLY)) == NOTOK
 978             || map_chk (cp, md, &d, (long) st.st_size, 1)) {
 979         if (md != NOTOK)
 980             close (md);
 981         return 0;
 982     }
 983     close (md);
 984     return (d.d_id);
 985 }