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

   1
   2 /*
   3  * inc.c -- incorporate messages from a maildrop into a folder
   4  *
   5  * $Id$
   6  *
   7  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   8  * COPYRIGHT file in the root directory of the nmh distribution for
   9  * complete copyright information.
  10  */
  11
  12 #ifdef MAILGROUP
  13 /* Revised: Sat Apr 14 17:08:17 PDT 1990 (marvit@hplabs)
  14  *    Added hpux hacks to set and reset gid to be "mail" as needed. The reset
  15  *    is necessary so inc'ed mail is the group of the inc'er, rather than
  16  *    "mail". We setgid to egid only when [un]locking the mail file. This
  17  *    is also a major security precaution which will not be explained here.
  18  *
  19  * Fri Feb  7 16:04:57 PST 1992         John Romine <bug-mh@ics.uci.edu>
  20  *   NB: I'm not 100% sure that this setgid stuff is secure even now.
  21  *
  22  * See the *GROUPPRIVS() macros later. I'm reasonably happy with the setgid
  23  * attribute. Running setuid root is probably not a terribly good idea, though.
  24  *       -- Peter Maydell <pmaydell@chiark.greenend.org.uk>, 04/1998
  25  *
  26  * Peter Maydell's patch slightly modified for nmh 0.28-pre2.
  27  * Ruud de Rooij <ruud@debian.org>  Wed, 22 Jul 1998 13:24:22 +0200
  28  */
  29 #endif
  30
  31 #include <h/mh.h>
  32 #include <fcntl.h>
  33
  34 #ifdef POP
  35 # include <h/dropsbr.h>
  36 # include <h/popsbr.h>
  37 #endif
  38
  39 #ifdef HESIOD
  40 # include <hesiod.h>
  41 #endif
  42
  43 #include <h/fmt_scan.h>
  44 #include <h/scansbr.h>
  45 #include <h/signals.h>
  46 #include <h/tws.h>
  47 #include <h/mts.h>
  48 #include <errno.h>
  49 #include <signal.h>
  50
  51 #ifndef POP
  52 # define POPminc(a) (a)
  53 #else
  54 # define POPminc(a)  0
  55 #endif
  56
  57 #ifndef RPOP
  58 # define RPOPminc(a) (a)
  59 #else
  60 # define RPOPminc(a)  0
  61 #endif
  62
  63 #ifndef APOP
  64 # define APOPminc(a) (a)
  65 #else
  66 # define APOPminc(a)  0
  67 #endif
  68
  69 #ifndef KPOP
  70 # define KPOPminc(a) (a)
  71 #else
  72 # define KPOPminc(a)  0
  73 #endif
  74
  75 #ifndef CYRUS_SASL
  76 # define SASLminc(a) (a)
  77 #else
  78 # define SASLminc(a)  0
  79 #endif
  80
  81 static struct swit switches[] = {
  82 #define AUDSW                      0
  83     { "audit audit-file", 0 },
  84 #define NAUDSW                     1
  85     { "noaudit", 0 },
  86 #define CHGSW                      2
  87     { "changecur", 0 },
  88 #define NCHGSW                     3
  89     { "nochangecur", 0 },
  90 #define FILESW                     4
  91     { "file name", 0 },
  92 #define FORMSW                     5
  93     { "form formatfile", 0 },
  94 #define FMTSW                      6
  95     { "format string", 5 },
  96 #define HOSTSW                     7
  97     { "host hostname", POPminc (-4) },
  98 #define USERSW                     8
  99     { "user username", POPminc (-4) },
 100 #define PACKSW                     9
 101     { "pack file", POPminc (-4) },
 102 #define NPACKSW                   10
 103     { "nopack", POPminc (-6) },
 104 #define APOPSW                    11
 105     { "apop", APOPminc (-4) },
 106 #define NAPOPSW                   12
 107     { "noapop", APOPminc (-6) },
 108 #define RPOPSW                    13
 109     { "rpop", RPOPminc (-4) },
 110 #define NRPOPSW                   14
 111     { "norpop", RPOPminc (-6) },
 112 #define SILSW                     15
 113     { "silent", 0 },
 114 #define NSILSW                    16
 115     { "nosilent", 0 },
 116 #define TRNCSW                    17
 117     { "truncate", 0 },
 118 #define NTRNCSW                   18
 119     { "notruncate", 0 },
 120 #define WIDTHSW                   19
 121     { "width columns", 0 },
 122 #define VERSIONSW                 20
 123     { "version", 0 },
 124 #define HELPSW                    21
 125     { "help", 0 },
 126 #define SNOOPSW                   22
 127     { "snoop", -5 },
 128 #define KPOPSW                    23
 129     { "kpop", KPOPminc (-4) },
 130 #define SASLSW                    24
 131     { "sasl", SASLminc(-4) },
 132 #define SASLMECHSW                25
 133     { "saslmech", SASLminc(-8) },
 134 #define PROXYSW                   26
 135     { "proxy command", POPminc(-5) },
 136     { NULL, 0 }
 137 };
 138
 139 /*
 140  * flags for the mail source
 141  */
 142 #define INC_FILE  0
 143 #define INC_POP   1
 144
 145 static int inc_type;
 146 static int snoop = 0;
 147
 148 #ifdef POP
 149 extern char response[];
 150
 151 static char *packfile = NULL;
 152 static int size;
 153 static long pos;
 154 static long start;
 155 static long stop;
 156
 157 static int mbx_style = MMDF_FORMAT;
 158 static int pd = NOTOK;
 159 static FILE *pf = NULL;
 160 #endif /* POP */
 161
 162 /* This is an attempt to simplify things by putting all the
 163  * privilege ops into macros.
 164  * *GROUPPRIVS() is related to handling the setgid MAIL property,
 165  * and only applies if MAILGROUP is defined.
 166  * *USERPRIVS() is related to handling the setuid root property,
 167  * and only applies if POP is defined [why does POP => setuid root?]
 168  * Basically, SAVEGROUPPRIVS() is called right at the top of main()
 169  * to initialise things, and then DROPGROUPPRIVS() and GETGROUPPRIVS()
 170  * do the obvious thing. TRYDROPGROUPPRIVS() has to be safe to call
 171  * before DROPUSERPRIVS() is called [this is needed because setgid()
 172  * sets both effective and real uids if euid is root.]
 173  *
 174  * There's probably a better implementation if we're allowed to use
 175  * BSD-style setreuid() rather than using POSIX saved-ids.
 176  * Anyway, if you're euid root it's a bit pointless to drop the group
 177  * permissions...
 178  *
 179  * I'm pretty happy that the security is good provided we aren't setuid root.
 180  * The only things we trust with group=mail privilege are lkfopen()
 181  * and lkfclose().
 182  */
 183
 184 /*
 185  * For setting and returning to "mail" gid
 186  */
 187 #ifdef MAILGROUP
 188 static int return_gid;
 189 #ifndef POP
 190 /* easy case; we're not setuid root, so can drop group privs
 191  * immediately.
 192  */
 193 #define TRYDROPGROUPPRIVS() DROPGROUPPRIVS()
 194 #else /* POP ie we are setuid root */
 195 #define TRYDROPGROUPPRIVS() \
 196 if (geteuid() != 0) DROPGROUPPRIVS()
 197 #endif
 198 #define DROPGROUPPRIVS() setgid(getgid())
 199 #define GETGROUPPRIVS() setgid(return_gid)
 200 #define SAVEGROUPPRIVS() return_gid = getegid()
 201 #else
 202 /* define *GROUPPRIVS() as null; this avoids having lots of "#ifdef MAILGROUP"s */
 203 #define TRYDROPGROUPPRIVS()
 204 #define DROPGROUPPRIVS()
 205 #define GETGROUPPRIVS()
 206 #define SAVEGROUPPRIVS()
 207 #endif /* not MAILGROUP */
 208
 209 #ifdef POP
 210 #define DROPUSERPRIVS() setuid(getuid())
 211 #else
 212 #define DROPUSERPRIVS()
 213 #endif
 214
 215 /* these variables have to be globals so that done() can correctly clean up the lockfile */
 216 static int locked = 0;
 217 static char *newmail;
 218 static FILE *in;
 219
 220 /*
 221  * prototypes
 222  */
 223 char *map_name(char *);
 224
 225 #ifdef POP
 226 int done(int);
 227 static int pop_action(char *);
 228 static int pop_pack(char *);
 229 static int map_count(void);
 230 #endif
 231
 232
 233 int
 234 main (int argc, char **argv)
 235 {
 236     int chgflag = 1, trnflag = 1;
 237     int noisy = 1, width = 0;
 238     int rpop, i, hghnum, msgnum;
 239     int kpop = 0, sasl = 0;
 240     char *cp, *maildir, *folder = NULL;
 241     char *format = NULL, *form = NULL;
 242     char *host = NULL, *user = NULL, *proxy = NULL;
 243     char *audfile = NULL, *from = NULL, *saslmech = NULL;
 244     char buf[BUFSIZ], **argp, *nfs, **arguments;
 245     struct msgs *mp;
 246     struct stat st, s1;
 247     FILE *aud = NULL;
 248     char        b[MAXPATHLEN + 1];
 249     char        *maildir_copy;          /* copy of mail directory because the static gets overwritten */
 250
 251 #ifdef POP
 252     int nmsgs, nbytes, p = 0;
 253     char *pass = NULL;
 254     char *MAILHOST_env_variable;
 255 #endif
 256
 257 #ifdef MHE
 258     FILE *mhe = NULL;
 259 #endif
 260
 261 #ifdef HESIOD
 262     struct hes_postoffice *po;
 263 #endif
 264
 265 /* absolutely the first thing we do is save our privileges,
 266  * and drop them if we can.
 267  */
 268     SAVEGROUPPRIVS();
 269     TRYDROPGROUPPRIVS();
 270
 271 #ifdef LOCALE
 272     setlocale(LC_ALL, "");
 273 #endif
 274     invo_name = r1bindex (argv[0], '/');
 275
 276     /* read user profile/context */
 277     context_read();
 278
 279     mts_init (invo_name);
 280     arguments = getarguments (invo_name, argc, argv, 1);
 281     argp = arguments;
 282
 283 #ifdef POP
 284     /*
 285      * Scheme is:
 286      *        use MAILHOST environment variable if present,
 287      *  else try Hesiod.
 288      *  If that fails, use the default (if any)
 289      *  provided by mts.conf in mts_init()
 290      */
 291     if ((MAILHOST_env_variable = getenv("MAILHOST")) != NULL)
 292         pophost = MAILHOST_env_variable;
 293 # ifdef HESIOD
 294     else if ((po = hes_getmailhost(getusername())) != NULL &&
 295              strcmp(po->po_type, "POP") == 0)
 296         pophost = po->po_host;
 297 # endif /* HESIOD */
 298     /*
 299      * If there is a valid "pophost" entry in mts.conf,
 300      * then use it as the default host.
 301      */
 302     if (pophost && *pophost)
 303         host = pophost;
 304
 305     if ((cp = getenv ("MHPOPDEBUG")) && *cp)
 306         snoop++;
 307 #endif /* POP */
 308
 309     rpop = 0;
 310
 311     while ((cp = *argp++)) {
 312         if (*cp == '-') {
 313             switch (smatch (++cp, switches)) {
 314             case AMBIGSW:
 315                 ambigsw (cp, switches);
 316                 done (1);
 317             case UNKWNSW:
 318                 adios (NULL, "-%s unknown", cp);
 319
 320             case HELPSW:
 321                 snprintf (buf, sizeof(buf), "%s [+folder] [switches]", invo_name);
 322                 print_help (buf, switches, 1);
 323                 done (1);
 324             case VERSIONSW:
 325                 print_version(invo_name);
 326                 done (1);
 327
 328             case AUDSW:
 329                 if (!(cp = *argp++) || *cp == '-')
 330                     adios (NULL, "missing argument to %s", argp[-2]);
 331                 audfile = getcpy (m_maildir (cp));
 332                 continue;
 333             case NAUDSW:
 334                 audfile = NULL;
 335                 continue;
 336
 337             case CHGSW:
 338                 chgflag++;
 339                 continue;
 340             case NCHGSW:
 341                 chgflag = 0;
 342                 continue;
 343
 344             /*
 345              * The flag `trnflag' has the value:
 346              *
 347              * 2 if -truncate is given
 348              * 1 by default (truncating is default)
 349              * 0 if -notruncate is given
 350              */
 351             case TRNCSW:
 352                 trnflag = 2;
 353                 continue;
 354             case NTRNCSW:
 355                 trnflag = 0;
 356                 continue;
 357
 358             case FILESW:
 359                 if (!(cp = *argp++) || *cp == '-')
 360                     adios (NULL, "missing argument to %s", argp[-2]);
 361                 from = path (cp, TFILE);
 362
 363                 /*
 364                  * If the truncate file is in default state,
 365                  * change to not truncate.
 366                  */
 367                 if (trnflag == 1)
 368                     trnflag = 0;
 369                 continue;
 370
 371             case SILSW:
 372                 noisy = 0;
 373                 continue;
 374             case NSILSW:
 375                 noisy++;
 376                 continue;
 377
 378             case FORMSW:
 379                 if (!(form = *argp++) || *form == '-')
 380                     adios (NULL, "missing argument to %s", argp[-2]);
 381                 format = NULL;
 382                 continue;
 383             case FMTSW:
 384                 if (!(format = *argp++) || *format == '-')
 385                     adios (NULL, "missing argument to %s", argp[-2]);
 386                 form = NULL;
 387                 continue;
 388
 389             case WIDTHSW:
 390                 if (!(cp = *argp++) || *cp == '-')
 391                     adios (NULL, "missing argument to %s", argp[-2]);
 392                 width = atoi (cp);
 393                 continue;
 394
 395             case HOSTSW:
 396                 if (!(host = *argp++) || *host == '-')
 397                     adios (NULL, "missing argument to %s", argp[-2]);
 398                 continue;
 399             case USERSW:
 400                 if (!(user = *argp++) || *user == '-')
 401                     adios (NULL, "missing argument to %s", argp[-2]);
 402                 continue;
 403
 404             case PACKSW:
 405 #ifndef POP
 406                 if (!(cp = *argp++) || *cp == '-')
 407                     adios (NULL, "missing argument to %s", argp[-2]);
 408 #else /* POP */
 409                 if (!(packfile = *argp++) || *packfile == '-')
 410                     adios (NULL, "missing argument to %s", argp[-2]);
 411 #endif /* POP */
 412                 continue;
 413             case NPACKSW:
 414 #ifdef POP
 415                 packfile = NULL;
 416 #endif /* POP */
 417                 continue;
 418
 419             case APOPSW:
 420                 rpop = -1;
 421                 continue;
 422             case NAPOPSW:
 423                 rpop = 0;
 424                 continue;
 425
 426             case RPOPSW:
 427                 rpop = 1;
 428                 continue;
 429             case NRPOPSW:
 430                 rpop = 0;
 431                 continue;
 432
 433             case KPOPSW:
 434                 kpop = 1;
 435                 continue;
 436
 437             case SNOOPSW:
 438                 snoop++;
 439                 continue;
 440
 441             case SASLSW:
 442                 sasl++;
 443                 continue;
 444
 445             case SASLMECHSW:
 446                 if (!(saslmech = *argp++) || *saslmech == '-')
 447                     adios (NULL, "missing argument to %s", argp[-2]);
 448                 continue;
 449             case PROXYSW:
 450                 if (!(proxy = *argp++) || *proxy == '-')
 451                     adios (NULL, "missing argument to %s", argp[-2]);
 452                 continue;
 453             }
 454         }
 455         if (*cp == '+' || *cp == '@') {
 456             if (folder)
 457                 adios (NULL, "only one folder at a time!");
 458             else
 459                 folder = path (cp + 1, *cp == '+' ? TFOLDER : TSUBCWF);
 460         } else {
 461             adios (NULL, "usage: %s [+folder] [switches]", invo_name);
 462         }
 463     }
 464
 465     /* NOTE: above this point you should use TRYDROPGROUPPRIVS(),
 466      * not DROPGROUPPRIVS().
 467      */
 468 #ifdef POP
 469     if (host && !*host)
 470         host = NULL;
 471     if (from || !host || rpop <= 0)
 472         DROPUSERPRIVS();
 473 #endif /* POP */
 474
 475     /* guarantee dropping group priveleges; we might not have done so earlier */
 476     DROPGROUPPRIVS();
 477
 478     /*
 479      * Where are we getting the new mail?
 480      */
 481     if (from)
 482         inc_type = INC_FILE;
 483 #ifdef POP
 484     else if (host)
 485         inc_type = INC_POP;
 486 #endif
 487     else
 488         inc_type = INC_FILE;
 489
 490 #ifdef POP
 491     /*
 492      * Are we getting the mail from
 493      * a POP server?
 494      */
 495     if (inc_type == INC_POP) {
 496         if (user == NULL)
 497             user = getusername ();
 498         if ( strcmp( POPSERVICE, "kpop" ) == 0 ) {
 499             kpop = 1;
 500         }
 501         if (kpop || sasl || ( rpop > 0))
 502             pass = getusername ();
 503         else
 504             ruserpass (host, &user, &pass);
 505
 506         /*
 507          * initialize POP connection
 508          */
 509         if (pop_init (host, user, pass, proxy, snoop, kpop ? 1 : rpop, kpop,
 510                       sasl, saslmech) == NOTOK)
 511             adios (NULL, "%s", response);
 512
 513         /* Check if there are any messages */
 514         if (pop_stat (&nmsgs, &nbytes) == NOTOK)
 515             adios (NULL, "%s", response);
 516
 517         if (rpop > 0)
 518             DROPUSERPRIVS();
 519         if (nmsgs == 0) {
 520             pop_quit();
 521             adios (NULL, "no mail to incorporate");
 522         }
 523     }
 524 #endif /* POP */
 525
 526     /*
 527      * We will get the mail from a file
 528      * (typically the standard maildrop)
 529      */
 530
 531     if (inc_type == INC_FILE) {
 532         if (from)
 533             newmail = from;
 534         else if ((newmail = getenv ("MAILDROP")) && *newmail)
 535             newmail = m_mailpath (newmail);
 536         else if ((newmail = context_find ("maildrop")) && *newmail)
 537             newmail = m_mailpath (newmail);
 538         else {
 539             newmail = concat (MAILDIR, "/", MAILFIL, NULL);
 540         }
 541         if (stat (newmail, &s1) == NOTOK || s1.st_size == 0)
 542             adios (NULL, "no mail to incorporate");
 543
 544         if ((cp = strdup(newmail)) == (char *)0)
 545             adios (maildir, "error allocating memory to copy newmail");
 546
 547         newmail = cp;
 548     }
 549
 550 #ifdef POP
 551     /* skip the folder setup */
 552     if ((inc_type == INC_POP) && packfile)
 553         goto go_to_it;
 554 #endif /* POP */
 555
 556     if (!context_find ("path"))
 557         free (path ("./", TFOLDER));
 558     if (!folder)
 559         folder = getfolder (0);
 560     maildir = m_maildir (folder);
 561
 562     if ((maildir_copy = strdup(maildir)) == (char *)0)
 563         adios (maildir, "error allocating memory to copy maildir");
 564
 565     if (noisy)
 566         create_folder(maildir, 0, done);
 567     else
 568         done (1);
 569
 570     if (chdir (maildir) == NOTOK)
 571         adios (maildir, "unable to change directory to");
 572
 573     /* read folder and create message structure */
 574     if (!(mp = folder_read (folder)))
 575         adios (NULL, "unable to read folder %s", folder);
 576
 577 #ifdef POP
 578 go_to_it:
 579 #endif /* POP */
 580
 581     if (inc_type == INC_FILE) {
 582         if (access (newmail, W_OK) != NOTOK) {
 583             locked++;
 584             if (trnflag) {
 585                 SIGNAL (SIGHUP, SIG_IGN);
 586                 SIGNAL (SIGINT, SIG_IGN);
 587                 SIGNAL (SIGQUIT, SIG_IGN);
 588                 SIGNAL (SIGTERM, SIG_IGN);
 589             }
 590
 591             GETGROUPPRIVS();       /* Reset gid to lock mail file */
 592             in = lkfopen (newmail, "r");
 593             DROPGROUPPRIVS();
 594             if (in == NULL)
 595                 adios (NULL, "unable to lock and fopen %s", newmail);
 596             fstat (fileno(in), &s1);
 597         } else {
 598             trnflag = 0;
 599             if ((in = fopen (newmail, "r")) == NULL)
 600                 adios (newmail, "unable to read");
 601         }
 602     }
 603
 604     /* This shouldn't be necessary but it can't hurt. */
 605     DROPGROUPPRIVS();
 606
 607     if (audfile) {
 608         if ((i = stat (audfile, &st)) == NOTOK)
 609             advise (NULL, "Creating Receive-Audit: %s", audfile);
 610         if ((aud = fopen (audfile, "a")) == NULL)
 611             adios (audfile, "unable to append to");
 612         else if (i == NOTOK)
 613             chmod (audfile, m_gmprot ());
 614
 615 #ifdef POP
 616         fprintf (aud, from ? "<<inc>> %s -ms %s\n"
 617                  : host ? "<<inc>> %s -host %s -user %s%s\n"
 618                  : "<<inc>> %s\n",
 619                  dtimenow (0), from ? from : host, user,
 620                  rpop < 0 ? " -apop" : rpop > 0 ? " -rpop" : "");
 621 #else /* POP */
 622         fprintf (aud, from ? "<<inc>> %s  -ms %s\n" : "<<inc>> %s\n",
 623                  dtimenow (0), from);
 624 #endif /* POP */
 625     }
 626
 627 #ifdef MHE
 628     if (context_find ("mhe")) {
 629         cp = concat (maildir, "/++", NULL);
 630         i = stat (cp, &st);
 631         if ((mhe = fopen (cp, "a")) == NULL)
 632             admonish (cp, "unable to append to");
 633         else
 634             if (i == NOTOK)
 635                 chmod (cp, m_gmprot ());
 636         free (cp);
 637     }
 638 #endif /* MHE */
 639
 640     /* Get new format string */
 641     nfs = new_fs (form, format, FORMAT);
 642
 643     if (noisy) {
 644         printf ("Incorporating new mail into %s...\n\n", folder);
 645         fflush (stdout);
 646     }
 647
 648 #ifdef POP
 649     /*
 650      * Get the mail from a POP server
 651      */
 652     if (inc_type == INC_POP) {
 653         if (packfile) {
 654             packfile = path (packfile, TFILE);
 655             if (stat (packfile, &st) == NOTOK) {
 656                 if (errno != ENOENT)
 657                     adios (packfile, "error on file");
 658                 cp = concat ("Create file \"", packfile, "\"? ", NULL);
 659                 if (noisy && !getanswer (cp))
 660                     done (1);
 661                 free (cp);
 662             }
 663             msgnum = map_count ();
 664             if ((pd = mbx_open (packfile, mbx_style, getuid(), getgid(), m_gmprot()))
 665                 == NOTOK)
 666                 adios (packfile, "unable to open");
 667             if ((pf = fdopen (pd, "w+")) == NULL)
 668                 adios (NULL, "unable to fdopen %s", packfile);
 669         } else {
 670             hghnum = msgnum = mp->hghmsg;
 671             /*
 672              * Check if we have enough message space for all the new
 673              * messages.  If not, then realloc the folder and add enough
 674              * space for all new messages plus 10 additional slots.
 675              */
 676             if (mp->hghmsg + nmsgs >= mp->hghoff
 677                 && !(mp = folder_realloc (mp, mp->lowoff, mp->hghmsg + nmsgs + 10)))
 678                 adios (NULL, "unable to allocate folder storage");
 679         }
 680
 681         for (i = 1; i <= nmsgs; i++) {
 682             msgnum++;
 683             if (packfile) {
 684                 fseek (pf, 0L, SEEK_CUR);
 685                 pos = ftell (pf);
 686                 size = 0;
 687                 fwrite (mmdlm1, 1, strlen (mmdlm1), pf);
 688                 start = ftell (pf);
 689
 690                 if (pop_retr (i, pop_pack) == NOTOK)
 691                     adios (NULL, "%s", response);
 692
 693                 fseek (pf, 0L, SEEK_CUR);
 694                 stop = ftell (pf);
 695                 if (fflush (pf))
 696                     adios (packfile, "write error on");
 697                 fseek (pf, start, SEEK_SET);
 698             } else {
 699                 cp = getcpy (m_name (msgnum));
 700                 if ((pf = fopen (cp, "w+")) == NULL)
 701                     adios (cp, "unable to write");
 702                 chmod (cp, m_gmprot ());
 703                 start = stop = 0L;
 704
 705                 if (pop_retr (i, pop_action) == NOTOK)
 706                     adios (NULL, "%s", response);
 707
 708                 if (fflush (pf))
 709                     adios (cp, "write error on");
 710                 fseek (pf, 0L, SEEK_SET);
 711             }
 712             switch (p = scan (pf, msgnum, 0, nfs, width,
 713                               packfile ? 0 : msgnum == mp->hghmsg + 1 && chgflag,
 714                               1, NULL, stop - start, noisy)) {
 715             case SCNEOF:
 716                 printf ("%*d  empty\n", DMAXFOLDER, msgnum);
 717                 break;
 718
 719             case SCNFAT:
 720                 trnflag = 0;
 721                 noisy++;
 722                 /* advise (cp, "unable to read"); already advised */
 723                 /* fall thru */
 724
 725             case SCNERR:
 726             case SCNNUM:
 727                 break;
 728
 729             case SCNMSG:
 730             case SCNENC:
 731             default:
 732                 if (aud)
 733                     fputs (scanl, aud);
 734 # ifdef MHE
 735                 if (mhe)
 736                     fputs (scanl, mhe);
 737 # endif /* MHE */
 738                 if (noisy)
 739                     fflush (stdout);
 740                 if (!packfile) {
 741                     clear_msg_flags (mp, msgnum);
 742                     set_exists (mp, msgnum);
 743                     set_unseen (mp, msgnum);
 744                     mp->msgflags |= SEQMOD;
 745                 }
 746                 break;
 747             }
 748             if (packfile) {
 749                 fseek (pf, stop, SEEK_SET);
 750                 fwrite (mmdlm2, 1, strlen (mmdlm2), pf);
 751                 if (fflush (pf) || ferror (pf)) {
 752                     int e = errno;
 753                     pop_quit ();
 754                     errno = e;
 755                     adios (packfile, "write error on");
 756                 }
 757                 map_write (packfile, pd, 0, 0L, start, stop, pos, size, noisy);
 758             } else {
 759                 if (ferror(pf) || fclose (pf)) {
 760                     int e = errno;
 761                     unlink (cp);
 762                     pop_quit ();
 763                     errno = e;
 764                     adios (cp, "write error on");
 765                 }
 766                 free (cp);
 767             }
 768
 769             if (trnflag && pop_dele (i) == NOTOK)
 770                 adios (NULL, "%s", response);
 771         }
 772
 773         if (pop_quit () == NOTOK)
 774             adios (NULL, "%s", response);
 775         if (packfile) {
 776             mbx_close (packfile, pd);
 777             pd = NOTOK;
 778         }
 779     }
 780 #endif /* POP */
 781
 782     /*
 783      * Get the mail from file (usually mail spool)
 784      */
 785     if (inc_type == INC_FILE) {
 786         m_unknown (in);         /* the MAGIC invocation... */
 787         hghnum = msgnum = mp->hghmsg;
 788         for (i = 0;;) {
 789             /*
 790              * Check if we need to allocate more space for message status.
 791              * If so, then add space for an additional 100 messages.
 792              */
 793             if (msgnum >= mp->hghoff
 794                 && !(mp = folder_realloc (mp, mp->lowoff, mp->hghoff + 100))) {
 795                 advise (NULL, "unable to allocate folder storage");
 796                 i = NOTOK;
 797                 break;
 798             }
 799
 800 #if 0
 801             /* copy file from spool to tmp file */
 802             tmpfilenam = m_scratch ("", invo_name);
 803             if ((fd = creat (tmpfilenam, m_gmprot ())) == NOTOK)
 804                 adios (tmpfilenam, "unable to create");
 805             chmod (tmpfilenam, m_gmprot ());
 806             if (!(in2 = fdopen (fd, "r+")))
 807                 adios (tmpfilenam, "unable to access");
 808             cpymsg (in, in2);
 809
 810             /* link message into folder */
 811             newmsg = folder_addmsg(mp, tmpfilenam);
 812 #endif
 813             /* create scanline for new message */
 814             switch (i = scan (in, msgnum + 1, msgnum + 1, nfs, width,
 815                               msgnum == hghnum && chgflag, 1, NULL, 0L, noisy)) {
 816             case SCNFAT:
 817             case SCNEOF:
 818                 break;
 819
 820             case SCNERR:
 821                 if (aud)
 822                     fputs ("inc aborted!\n", aud);
 823                 advise (NULL, "aborted!");      /* doesn't clean up locks! */
 824                 break;
 825
 826             case SCNNUM:
 827                 advise (NULL, "BUG in %s, number out of range", invo_name);
 828                 break;
 829
 830             default:
 831                 advise (NULL, "BUG in %s, scan() botch (%d)", invo_name, i);
 832                 break;
 833
 834             case SCNMSG:
 835             case SCNENC:
 836                 /*
 837                  *  Run the external program hook on the message.
 838                  */
 839
 840                 (void)snprintf(b, sizeof (b), "%s/%d", maildir_copy, msgnum + 1);
 841                 (void)ext_hook("add-hook", b, (char *)0);
 842
 843                 if (aud)
 844                     fputs (scanl, aud);
 845 #ifdef MHE
 846                 if (mhe)
 847                     fputs (scanl, mhe);
 848 #endif /* MHE */
 849                 if (noisy)
 850                     fflush (stdout);
 851
 852                 msgnum++;
 853                 mp->hghmsg++;
 854                 mp->nummsg++;
 855                 if (mp->lowmsg == 0) mp->lowmsg = 1;
 856
 857                 clear_msg_flags (mp, msgnum);
 858                 set_exists (mp, msgnum);
 859                 set_unseen (mp, msgnum);
 860                 mp->msgflags |= SEQMOD;
 861                 continue;
 862             }
 863             break;
 864         }
 865     }
 866
 867 #ifdef POP
 868     if (p < 0) {                /* error */
 869 #else
 870     if (i < 0) {                /* error */
 871 #endif
 872         if (locked) {
 873             GETGROUPPRIVS();      /* Be sure we can unlock mail file */
 874             (void) lkfclose (in, newmail); in = NULL;
 875             DROPGROUPPRIVS();    /* And then return us to normal privileges */
 876         } else {
 877             fclose (in); in = NULL;
 878         }
 879         adios (NULL, "failed");
 880     }
 881
 882     if (aud)
 883         fclose (aud);
 884
 885 #ifdef MHE
 886     if (mhe)
 887         fclose (mhe);
 888 #endif /* MHE */
 889
 890     if (noisy)
 891         fflush (stdout);
 892
 893 #ifdef POP
 894     if ((inc_type == INC_POP) && packfile)
 895         done (0);
 896 #endif /* POP */
 897
 898     /*
 899      * truncate file we are incorporating from
 900      */
 901     if (inc_type == INC_FILE) {
 902         if (trnflag) {
 903             if (stat (newmail, &st) != NOTOK && s1.st_mtime != st.st_mtime)
 904                 advise (NULL, "new messages have arrived!\007");
 905             else {
 906                 if ((i = creat (newmail, 0600)) != NOTOK)
 907                     close (i);
 908                 else
 909                     admonish (newmail, "error zero'ing");
 910                 unlink(map_name(newmail));
 911             }
 912         } else {
 913             if (noisy)
 914                 printf ("%s not zero'd\n", newmail);
 915         }
 916     }
 917
 918     if (msgnum == hghnum) {
 919         admonish (NULL, "no messages incorporated");
 920     } else {
 921         context_replace (pfolder, folder);      /* update current folder */
 922         if (chgflag)
 923             mp->curmsg = hghnum + 1;
 924         mp->hghmsg = msgnum;
 925         if (mp->lowmsg == 0)
 926             mp->lowmsg = 1;
 927         if (chgflag)            /* sigh... */
 928             seq_setcur (mp, mp->curmsg);
 929     }
 930
 931     /*
 932      * unlock the mail spool
 933      */
 934     if (inc_type == INC_FILE) {
 935         if (locked) {
 936            GETGROUPPRIVS();        /* Be sure we can unlock mail file */
 937            (void) lkfclose (in, newmail); in = NULL;
 938            DROPGROUPPRIVS();       /* And then return us to normal privileges */
 939         } else {
 940             fclose (in); in = NULL;
 941         }
 942     }
 943
 944     seq_setunseen (mp, 0);      /* set the Unseen-Sequence */
 945     seq_save (mp);              /* synchronize sequences   */
 946     context_save ();            /* save the context file   */
 947     return done (0);
 948 }
 949
 950
 951 #if 0
 952
 953 /*
 954  * Copy message message from spool into
 955  * temporary file.  Massage the "From " line
 956  * while copying.
 957  */
 958
 959 cpymsg (FILE *in, FILE *out)
 960 {
 961     int state;
 962     char *tmpbuf, name[NAMESZ];
 963
 964     for (;;) {
 965         state = m_getfld (state, name, tmpbuf, rlwidth, in);
 966         switch (state) {
 967         case FLD:
 968         case FLDPLUS:
 969             break;
 970         case BODY:
 971             break;
 972         case LENERR:
 973         case FMTERR:
 974             break;
 975         case FILEEOF:
 976             break;
 977         default:
 978         }
 979     }
 980 }
 981 #endif /* if 0 */
 982
 983
 984 int
 985 done (int status)
 986 {
 987 #ifdef POP
 988     if (packfile && pd != NOTOK)
 989         mbx_close (packfile, pd);
 990 #endif /* POP */
 991     if (locked)
 992     {
 993         GETGROUPPRIVS();
 994         lkfclose(in, newmail);
 995         DROPGROUPPRIVS();
 996     }
 997     exit (status);
 998     return 1;  /* dead code to satisfy the compiler */
 999 }
1000
1001 #ifdef POP
1002 static int
1003 pop_action (char *s)
1004 {
1005     fprintf (pf, "%s\n", s);
1006     stop += strlen (s) + 1;
1007     return 0;  /* Is return value used?  This was missing before 1999-07-15. */
1008 }
1009
1010 static int
1011 pop_pack (char *s)
1012 {
1013     int j;
1014     char buffer[BUFSIZ];
1015
1016     snprintf (buffer, sizeof(buffer), "%s\n", s);
1017     for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
1018         continue;
1019     for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
1020         continue;
1021     fputs (buffer, pf);
1022     size += strlen (buffer) + 1;
1023     return 0;  /* Is return value used?  This was missing before 1999-07-15. */
1024 }
1025
1026 static int
1027 map_count (void)
1028 {
1029     int md;
1030     char *cp;
1031     struct drop d;
1032     struct stat st;
1033
1034     if (stat (packfile, &st) == NOTOK)
1035         return 0;
1036     if ((md = open (cp = map_name (packfile), O_RDONLY)) == NOTOK
1037             || map_chk (cp, md, &d, (long) st.st_size, 1)) {
1038         if (md != NOTOK)
1039             close (md);
1040         return 0;
1041     }
1042     close (md);
1043     return (d.d_id);
1044 }
1045 #endif /* POP */