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 <h/utils.h>
  33 #include <fcntl.h>
  34
  35 #ifdef POP
  36 # include <h/dropsbr.h>
  37 # include <h/popsbr.h>
  38 #endif
  39
  40 #ifdef HESIOD
  41 # include <hesiod.h>
  42 #endif
  43
  44 #include <h/fmt_scan.h>
  45 #include <h/scansbr.h>
  46 #include <h/signals.h>
  47 #include <h/tws.h>
  48 #include <h/mts.h>
  49 #include <errno.h>
  50 #include <signal.h>
  51
  52 #ifndef POP
  53 # define POPminc(a) (a)
  54 #else
  55 # define POPminc(a)  0
  56 #endif
  57
  58 #ifndef RPOP
  59 # define RPOPminc(a) (a)
  60 #else
  61 # define RPOPminc(a)  0
  62 #endif
  63
  64 #ifndef APOP
  65 # define APOPminc(a) (a)
  66 #else
  67 # define APOPminc(a)  0
  68 #endif
  69
  70 #ifndef KPOP
  71 # define KPOPminc(a) (a)
  72 #else
  73 # define KPOPminc(a)  0
  74 #endif
  75
  76 #ifndef CYRUS_SASL
  77 # define SASLminc(a) (a)
  78 #else
  79 # define SASLminc(a)  0
  80 #endif
  81
  82 static struct swit switches[] = {
  83 #define AUDSW                      0
  84     { "audit audit-file", 0 },
  85 #define NAUDSW                     1
  86     { "noaudit", 0 },
  87 #define CHGSW                      2
  88     { "changecur", 0 },
  89 #define NCHGSW                     3
  90     { "nochangecur", 0 },
  91 #define FILESW                     4
  92     { "file name", 0 },
  93 #define FORMSW                     5
  94     { "form formatfile", 0 },
  95 #define FMTSW                      6
  96     { "format string", 5 },
  97 #define HOSTSW                     7
  98     { "host hostname", POPminc (-4) },
  99 #define USERSW                     8
 100     { "user username", POPminc (-4) },
 101 #define PACKSW                     9
 102     { "pack file", POPminc (-4) },
 103 #define NPACKSW                   10
 104     { "nopack", POPminc (-6) },
 105 #define APOPSW                    11
 106     { "apop", APOPminc (-4) },
 107 #define NAPOPSW                   12
 108     { "noapop", APOPminc (-6) },
 109 #define RPOPSW                    13
 110     { "rpop", RPOPminc (-4) },
 111 #define NRPOPSW                   14
 112     { "norpop", RPOPminc (-6) },
 113 #define SILSW                     15
 114     { "silent", 0 },
 115 #define NSILSW                    16
 116     { "nosilent", 0 },
 117 #define TRNCSW                    17
 118     { "truncate", 0 },
 119 #define NTRNCSW                   18
 120     { "notruncate", 0 },
 121 #define WIDTHSW                   19
 122     { "width columns", 0 },
 123 #define VERSIONSW                 20
 124     { "version", 0 },
 125 #define HELPSW                    21
 126     { "help", 0 },
 127 #define SNOOPSW                   22
 128     { "snoop", -5 },
 129 #define KPOPSW                    23
 130     { "kpop", KPOPminc (-4) },
 131 #define SASLSW                    24
 132     { "sasl", SASLminc(-4) },
 133 #define SASLMECHSW                25
 134     { "saslmech", SASLminc(-8) },
 135 #define PROXYSW                   26
 136     { "proxy command", POPminc(-5) },
 137     { NULL, 0 }
 138 };
 139
 140 /*
 141  * flags for the mail source
 142  */
 143 #define INC_FILE  0
 144 #define INC_POP   1
 145
 146 static int inc_type;
 147 static int snoop = 0;
 148
 149 #ifdef POP
 150 extern char response[];
 151
 152 static char *packfile = NULL;
 153 static int size;
 154 static long pos;
 155 static long start;
 156 static long stop;
 157
 158 static int mbx_style = MMDF_FORMAT;
 159 static int pd = NOTOK;
 160 static FILE *pf = NULL;
 161 #endif /* POP */
 162
 163 /* This is an attempt to simplify things by putting all the
 164  * privilege ops into macros.
 165  * *GROUPPRIVS() is related to handling the setgid MAIL property,
 166  * and only applies if MAILGROUP is defined.
 167  * *USERPRIVS() is related to handling the setuid root property,
 168  * and only applies if POP is defined [why does POP => setuid root?]
 169  * Basically, SAVEGROUPPRIVS() is called right at the top of main()
 170  * to initialise things, and then DROPGROUPPRIVS() and GETGROUPPRIVS()
 171  * do the obvious thing. TRYDROPGROUPPRIVS() has to be safe to call
 172  * before DROPUSERPRIVS() is called [this is needed because setgid()
 173  * sets both effective and real uids if euid is root.]
 174  *
 175  * There's probably a better implementation if we're allowed to use
 176  * BSD-style setreuid() rather than using POSIX saved-ids.
 177  * Anyway, if you're euid root it's a bit pointless to drop the group
 178  * permissions...
 179  *
 180  * I'm pretty happy that the security is good provided we aren't setuid root.
 181  * The only things we trust with group=mail privilege are lkfopen()
 182  * and lkfclose().
 183  */
 184
 185 /*
 186  * For setting and returning to "mail" gid
 187  */
 188 #ifdef MAILGROUP
 189 static int return_gid;
 190 #ifndef POP
 191 /* easy case; we're not setuid root, so can drop group privs
 192  * immediately.
 193  */
 194 #define TRYDROPGROUPPRIVS() DROPGROUPPRIVS()
 195 #else /* POP ie we are setuid root */
 196 #define TRYDROPGROUPPRIVS() \
 197 if (geteuid() != 0) DROPGROUPPRIVS()
 198 #endif
 199 #define DROPGROUPPRIVS() setgid(getgid())
 200 #define GETGROUPPRIVS() setgid(return_gid)
 201 #define SAVEGROUPPRIVS() return_gid = getegid()
 202 #else
 203 /* define *GROUPPRIVS() as null; this avoids having lots of "#ifdef MAILGROUP"s */
 204 #define TRYDROPGROUPPRIVS()
 205 #define DROPGROUPPRIVS()
 206 #define GETGROUPPRIVS()
 207 #define SAVEGROUPPRIVS()
 208 #endif /* not MAILGROUP */
 209
 210 #ifdef POP
 211 #define DROPUSERPRIVS() setuid(getuid())
 212 #else
 213 #define DROPUSERPRIVS()
 214 #endif
 215
 216 /* these variables have to be globals so that done() can correctly clean up the lockfile */
 217 static int locked = 0;
 218 static char *newmail;
 219 static FILE *in;
 220
 221 /*
 222  * prototypes
 223  */
 224 char *map_name(char *);
 225
 226 static void inc_done(int);
 227 #ifdef POP
 228 static int pop_action(char *);
 229 static int pop_pack(char *);
 230 static int map_count(void);
 231 #endif
 232
 233
 234 int
 235 main (int argc, char **argv)
 236 {
 237     int chgflag = 1, trnflag = 1;
 238     int noisy = 1, width = 0;
 239     int rpop, i, hghnum, msgnum;
 240     int kpop = 0, sasl = 0;
 241     char *cp, *maildir, *folder = NULL;
 242     char *format = NULL, *form = NULL;
 243     char *host = NULL, *user = NULL, *proxy = NULL;
 244     char *audfile = NULL, *from = NULL, *saslmech = NULL;
 245     char buf[BUFSIZ], **argp, *nfs, **arguments;
 246     struct msgs *mp;
 247     struct stat st, s1;
 248     FILE *aud = NULL;
 249     char        b[MAXPATHLEN + 1];
 250     char        *maildir_copy;          /* copy of mail directory because the static gets overwritten */
 251
 252 #ifdef POP
 253     int nmsgs, nbytes, p = 0;
 254     char *pass = NULL;
 255     char *MAILHOST_env_variable;
 256 #endif
 257
 258 #ifdef MHE
 259     FILE *mhe = NULL;
 260 #endif
 261
 262 #ifdef HESIOD
 263     struct hes_postoffice *po;
 264 #endif
 265
 266     done=inc_done;
 267
 268 /* absolutely the first thing we do is save our privileges,
 269  * and drop them if we can.
 270  */
 271     SAVEGROUPPRIVS();
 272     TRYDROPGROUPPRIVS();
 273
 274 #ifdef LOCALE
 275     setlocale(LC_ALL, "");
 276 #endif
 277     invo_name = r1bindex (argv[0], '/');
 278
 279     /* read user profile/context */
 280     context_read();
 281
 282     mts_init (invo_name);
 283     arguments = getarguments (invo_name, argc, argv, 1);
 284     argp = arguments;
 285
 286 #ifdef POP
 287     /*
 288      * Scheme is:
 289      *        use MAILHOST environment variable if present,
 290      *  else try Hesiod.
 291      *  If that fails, use the default (if any)
 292      *  provided by mts.conf in mts_init()
 293      */
 294     if ((MAILHOST_env_variable = getenv("MAILHOST")) != NULL)
 295         pophost = MAILHOST_env_variable;
 296 # ifdef HESIOD
 297     else if ((po = hes_getmailhost(getusername())) != NULL &&
 298              strcmp(po->po_type, "POP") == 0)
 299         pophost = po->po_host;
 300 # endif /* HESIOD */
 301     /*
 302      * If there is a valid "pophost" entry in mts.conf,
 303      * then use it as the default host.
 304      */
 305     if (pophost && *pophost)
 306         host = pophost;
 307
 308     if ((cp = getenv ("MHPOPDEBUG")) && *cp)
 309         snoop++;
 310 #endif /* POP */
 311
 312     rpop = 0;
 313
 314     while ((cp = *argp++)) {
 315         if (*cp == '-') {
 316             switch (smatch (++cp, switches)) {
 317             case AMBIGSW:
 318                 ambigsw (cp, switches);
 319                 done (1);
 320             case UNKWNSW:
 321                 adios (NULL, "-%s unknown", cp);
 322
 323             case HELPSW:
 324                 snprintf (buf, sizeof(buf), "%s [+folder] [switches]", invo_name);
 325                 print_help (buf, switches, 1);
 326                 done (1);
 327             case VERSIONSW:
 328                 print_version(invo_name);
 329                 done (1);
 330
 331             case AUDSW:
 332                 if (!(cp = *argp++) || *cp == '-')
 333                     adios (NULL, "missing argument to %s", argp[-2]);
 334                 audfile = getcpy (m_maildir (cp));
 335                 continue;
 336             case NAUDSW:
 337                 audfile = NULL;
 338                 continue;
 339
 340             case CHGSW:
 341                 chgflag++;
 342                 continue;
 343             case NCHGSW:
 344                 chgflag = 0;
 345                 continue;
 346
 347             /*
 348              * The flag `trnflag' has the value:
 349              *
 350              * 2 if -truncate is given
 351              * 1 by default (truncating is default)
 352              * 0 if -notruncate is given
 353              */
 354             case TRNCSW:
 355                 trnflag = 2;
 356                 continue;
 357             case NTRNCSW:
 358                 trnflag = 0;
 359                 continue;
 360
 361             case FILESW:
 362                 if (!(cp = *argp++) || *cp == '-')
 363                     adios (NULL, "missing argument to %s", argp[-2]);
 364                 from = path (cp, TFILE);
 365
 366                 /*
 367                  * If the truncate file is in default state,
 368                  * change to not truncate.
 369                  */
 370                 if (trnflag == 1)
 371                     trnflag = 0;
 372                 continue;
 373
 374             case SILSW:
 375                 noisy = 0;
 376                 continue;
 377             case NSILSW:
 378                 noisy++;
 379                 continue;
 380
 381             case FORMSW:
 382                 if (!(form = *argp++) || *form == '-')
 383                     adios (NULL, "missing argument to %s", argp[-2]);
 384                 format = NULL;
 385                 continue;
 386             case FMTSW:
 387                 if (!(format = *argp++) || *format == '-')
 388                     adios (NULL, "missing argument to %s", argp[-2]);
 389                 form = NULL;
 390                 continue;
 391
 392             case WIDTHSW:
 393                 if (!(cp = *argp++) || *cp == '-')
 394                     adios (NULL, "missing argument to %s", argp[-2]);
 395                 width = atoi (cp);
 396                 continue;
 397
 398             case HOSTSW:
 399                 if (!(host = *argp++) || *host == '-')
 400                     adios (NULL, "missing argument to %s", argp[-2]);
 401                 continue;
 402             case USERSW:
 403                 if (!(user = *argp++) || *user == '-')
 404                     adios (NULL, "missing argument to %s", argp[-2]);
 405                 continue;
 406
 407             case PACKSW:
 408 #ifndef POP
 409                 if (!(cp = *argp++) || *cp == '-')
 410                     adios (NULL, "missing argument to %s", argp[-2]);
 411 #else /* POP */
 412                 if (!(packfile = *argp++) || *packfile == '-')
 413                     adios (NULL, "missing argument to %s", argp[-2]);
 414 #endif /* POP */
 415                 continue;
 416             case NPACKSW:
 417 #ifdef POP
 418                 packfile = NULL;
 419 #endif /* POP */
 420                 continue;
 421
 422             case APOPSW:
 423                 rpop = -1;
 424                 continue;
 425             case NAPOPSW:
 426                 rpop = 0;
 427                 continue;
 428
 429             case RPOPSW:
 430                 rpop = 1;
 431                 continue;
 432             case NRPOPSW:
 433                 rpop = 0;
 434                 continue;
 435
 436             case KPOPSW:
 437                 kpop = 1;
 438                 continue;
 439
 440             case SNOOPSW:
 441                 snoop++;
 442                 continue;
 443
 444             case SASLSW:
 445                 sasl++;
 446                 continue;
 447
 448             case SASLMECHSW:
 449                 if (!(saslmech = *argp++) || *saslmech == '-')
 450                     adios (NULL, "missing argument to %s", argp[-2]);
 451                 continue;
 452             case PROXYSW:
 453                 if (!(proxy = *argp++) || *proxy == '-')
 454                     adios (NULL, "missing argument to %s", argp[-2]);
 455                 continue;
 456             }
 457         }
 458         if (*cp == '+' || *cp == '@') {
 459             if (folder)
 460                 adios (NULL, "only one folder at a time!");
 461             else
 462                 folder = pluspath (cp);
 463         } else {
 464             adios (NULL, "usage: %s [+folder] [switches]", invo_name);
 465         }
 466     }
 467
 468     /* NOTE: above this point you should use TRYDROPGROUPPRIVS(),
 469      * not DROPGROUPPRIVS().
 470      */
 471 #ifdef POP
 472     if (host && !*host)
 473         host = NULL;
 474     if (from || !host || rpop <= 0)
 475         DROPUSERPRIVS();
 476 #endif /* POP */
 477
 478     /* guarantee dropping group priveleges; we might not have done so earlier */
 479     DROPGROUPPRIVS();
 480
 481     /*
 482      * Where are we getting the new mail?
 483      */
 484     if (from)
 485         inc_type = INC_FILE;
 486 #ifdef POP
 487     else if (host)
 488         inc_type = INC_POP;
 489 #endif
 490     else
 491         inc_type = INC_FILE;
 492
 493 #ifdef POP
 494     /*
 495      * Are we getting the mail from
 496      * a POP server?
 497      */
 498     if (inc_type == INC_POP) {
 499         if (user == NULL)
 500             user = getusername ();
 501         if ( strcmp( POPSERVICE, "kpop" ) == 0 ) {
 502             kpop = 1;
 503         }
 504         if (kpop || sasl || ( rpop > 0))
 505             pass = getusername ();
 506         else
 507             ruserpass (host, &user, &pass);
 508
 509         /*
 510          * initialize POP connection
 511          */
 512         if (pop_init (host, user, pass, proxy, snoop, kpop ? 1 : rpop, kpop,
 513                       sasl, saslmech) == NOTOK)
 514             adios (NULL, "%s", response);
 515
 516         /* Check if there are any messages */
 517         if (pop_stat (&nmsgs, &nbytes) == NOTOK)
 518             adios (NULL, "%s", response);
 519
 520         if (rpop > 0)
 521             DROPUSERPRIVS();
 522         if (nmsgs == 0) {
 523             pop_quit();
 524             adios (NULL, "no mail to incorporate");
 525         }
 526     }
 527 #endif /* POP */
 528
 529     /*
 530      * We will get the mail from a file
 531      * (typically the standard maildrop)
 532      */
 533
 534     if (inc_type == INC_FILE) {
 535         if (from)
 536             newmail = from;
 537         else if ((newmail = getenv ("MAILDROP")) && *newmail)
 538             newmail = m_mailpath (newmail);
 539         else if ((newmail = context_find ("maildrop")) && *newmail)
 540             newmail = m_mailpath (newmail);
 541         else {
 542             newmail = concat (MAILDIR, "/", MAILFIL, NULL);
 543         }
 544         if (stat (newmail, &s1) == NOTOK || s1.st_size == 0)
 545             adios (NULL, "no mail to incorporate");
 546
 547         if ((cp = strdup(newmail)) == (char *)0)
 548             adios (maildir, "error allocating memory to copy newmail");
 549
 550         newmail = cp;
 551     }
 552
 553 #ifdef POP
 554     /* skip the folder setup */
 555     if ((inc_type == INC_POP) && packfile)
 556         goto go_to_it;
 557 #endif /* POP */
 558
 559     if (!context_find ("path"))
 560         free (path ("./", TFOLDER));
 561     if (!folder)
 562         folder = getfolder (0);
 563     maildir = m_maildir (folder);
 564
 565     if ((maildir_copy = strdup(maildir)) == (char *)0)
 566         adios (maildir, "error allocating memory to copy maildir");
 567
 568     if (!folder_exists(maildir)) {
 569         /* If the folder doesn't exist, and we're given the -silent flag,
 570          * just fail.
 571          */
 572         if (noisy)
 573             create_folder(maildir, 0, done);
 574         else
 575             done (1);
 576     }
 577
 578     if (chdir (maildir) == NOTOK)
 579         adios (maildir, "unable to change directory to");
 580
 581     /* read folder and create message structure */
 582     if (!(mp = folder_read (folder)))
 583         adios (NULL, "unable to read folder %s", folder);
 584
 585 #ifdef POP
 586 go_to_it:
 587 #endif /* POP */
 588
 589     if (inc_type == INC_FILE) {
 590         if (access (newmail, W_OK) != NOTOK) {
 591             locked++;
 592             if (trnflag) {
 593                 SIGNAL (SIGHUP, SIG_IGN);
 594                 SIGNAL (SIGINT, SIG_IGN);
 595                 SIGNAL (SIGQUIT, SIG_IGN);
 596                 SIGNAL (SIGTERM, SIG_IGN);
 597             }
 598
 599             GETGROUPPRIVS();       /* Reset gid to lock mail file */
 600             in = lkfopen (newmail, "r");
 601             DROPGROUPPRIVS();
 602             if (in == NULL)
 603                 adios (NULL, "unable to lock and fopen %s", newmail);
 604             fstat (fileno(in), &s1);
 605         } else {
 606             trnflag = 0;
 607             if ((in = fopen (newmail, "r")) == NULL)
 608                 adios (newmail, "unable to read");
 609         }
 610     }
 611
 612     /* This shouldn't be necessary but it can't hurt. */
 613     DROPGROUPPRIVS();
 614
 615     if (audfile) {
 616         if ((i = stat (audfile, &st)) == NOTOK)
 617             advise (NULL, "Creating Receive-Audit: %s", audfile);
 618         if ((aud = fopen (audfile, "a")) == NULL)
 619             adios (audfile, "unable to append to");
 620         else if (i == NOTOK)
 621             chmod (audfile, m_gmprot ());
 622
 623 #ifdef POP
 624         fprintf (aud, from ? "<<inc>> %s -ms %s\n"
 625                  : host ? "<<inc>> %s -host %s -user %s%s\n"
 626                  : "<<inc>> %s\n",
 627                  dtimenow (0), from ? from : host, user,
 628                  rpop < 0 ? " -apop" : rpop > 0 ? " -rpop" : "");
 629 #else /* POP */
 630         fprintf (aud, from ? "<<inc>> %s  -ms %s\n" : "<<inc>> %s\n",
 631                  dtimenow (0), from);
 632 #endif /* POP */
 633     }
 634
 635 #ifdef MHE
 636     if (context_find ("mhe")) {
 637         cp = concat (maildir, "/++", NULL);
 638         i = stat (cp, &st);
 639         if ((mhe = fopen (cp, "a")) == NULL)
 640             admonish (cp, "unable to append to");
 641         else
 642             if (i == NOTOK)
 643                 chmod (cp, m_gmprot ());
 644         free (cp);
 645     }
 646 #endif /* MHE */
 647
 648     /* Get new format string */
 649     nfs = new_fs (form, format, FORMAT);
 650
 651     if (noisy) {
 652         printf ("Incorporating new mail into %s...\n\n", folder);
 653         fflush (stdout);
 654     }
 655
 656 #ifdef POP
 657     /*
 658      * Get the mail from a POP server
 659      */
 660     if (inc_type == INC_POP) {
 661         if (packfile) {
 662             packfile = path (packfile, TFILE);
 663             if (stat (packfile, &st) == NOTOK) {
 664                 if (errno != ENOENT)
 665                     adios (packfile, "error on file");
 666                 cp = concat ("Create file \"", packfile, "\"? ", NULL);
 667                 if (noisy && !getanswer (cp))
 668                     done (1);
 669                 free (cp);
 670             }
 671             msgnum = map_count ();
 672             if ((pd = mbx_open (packfile, mbx_style, getuid(), getgid(), m_gmprot()))
 673                 == NOTOK)
 674                 adios (packfile, "unable to open");
 675             if ((pf = fdopen (pd, "w+")) == NULL)
 676                 adios (NULL, "unable to fdopen %s", packfile);
 677         } else {
 678             hghnum = msgnum = mp->hghmsg;
 679             /*
 680              * Check if we have enough message space for all the new
 681              * messages.  If not, then realloc the folder and add enough
 682              * space for all new messages plus 10 additional slots.
 683              */
 684             if (mp->hghmsg + nmsgs >= mp->hghoff
 685                 && !(mp = folder_realloc (mp, mp->lowoff, mp->hghmsg + nmsgs + 10)))
 686                 adios (NULL, "unable to allocate folder storage");
 687         }
 688
 689         for (i = 1; i <= nmsgs; i++) {
 690             msgnum++;
 691             if (packfile) {
 692                 fseek (pf, 0L, SEEK_CUR);
 693                 pos = ftell (pf);
 694                 size = 0;
 695                 fwrite (mmdlm1, 1, strlen (mmdlm1), pf);
 696                 start = ftell (pf);
 697
 698                 if (pop_retr (i, pop_pack) == NOTOK)
 699                     adios (NULL, "%s", response);
 700
 701                 fseek (pf, 0L, SEEK_CUR);
 702                 stop = ftell (pf);
 703                 if (fflush (pf))
 704                     adios (packfile, "write error on");
 705                 fseek (pf, start, SEEK_SET);
 706             } else {
 707                 cp = getcpy (m_name (msgnum));
 708                 if ((pf = fopen (cp, "w+")) == NULL)
 709                     adios (cp, "unable to write");
 710                 chmod (cp, m_gmprot ());
 711                 start = stop = 0L;
 712
 713                 if (pop_retr (i, pop_action) == NOTOK)
 714                     adios (NULL, "%s", response);
 715
 716                 if (fflush (pf))
 717                     adios (cp, "write error on");
 718                 fseek (pf, 0L, SEEK_SET);
 719             }
 720             switch (p = scan (pf, msgnum, 0, nfs, width,
 721                               packfile ? 0 : msgnum == mp->hghmsg + 1 && chgflag,
 722                               1, NULL, stop - start, noisy)) {
 723             case SCNEOF:
 724                 printf ("%*d  empty\n", DMAXFOLDER, msgnum);
 725                 break;
 726
 727             case SCNFAT:
 728                 trnflag = 0;
 729                 noisy++;
 730                 /* advise (cp, "unable to read"); already advised */
 731                 /* fall thru */
 732
 733             case SCNERR:
 734             case SCNNUM:
 735                 break;
 736
 737             case SCNMSG:
 738             case SCNENC:
 739             default:
 740                 if (aud)
 741                     fputs (scanl, aud);
 742 # ifdef MHE
 743                 if (mhe)
 744                     fputs (scanl, mhe);
 745 # endif /* MHE */
 746                 if (noisy)
 747                     fflush (stdout);
 748                 if (!packfile) {
 749                     clear_msg_flags (mp, msgnum);
 750                     set_exists (mp, msgnum);
 751                     set_unseen (mp, msgnum);
 752                     mp->msgflags |= SEQMOD;
 753                 }
 754                 break;
 755             }
 756             if (packfile) {
 757                 fseek (pf, stop, SEEK_SET);
 758                 fwrite (mmdlm2, 1, strlen (mmdlm2), pf);
 759                 if (fflush (pf) || ferror (pf)) {
 760                     int e = errno;
 761                     pop_quit ();
 762                     errno = e;
 763                     adios (packfile, "write error on");
 764                 }
 765                 map_write (packfile, pd, 0, 0L, start, stop, pos, size, noisy);
 766             } else {
 767                 if (ferror(pf) || fclose (pf)) {
 768                     int e = errno;
 769                     unlink (cp);
 770                     pop_quit ();
 771                     errno = e;
 772                     adios (cp, "write error on");
 773                 }
 774                 free (cp);
 775             }
 776
 777             if (trnflag && pop_dele (i) == NOTOK)
 778                 adios (NULL, "%s", response);
 779         }
 780
 781         if (pop_quit () == NOTOK)
 782             adios (NULL, "%s", response);
 783         if (packfile) {
 784             mbx_close (packfile, pd);
 785             pd = NOTOK;
 786         }
 787     }
 788 #endif /* POP */
 789
 790     /*
 791      * Get the mail from file (usually mail spool)
 792      */
 793     if (inc_type == INC_FILE) {
 794         m_unknown (in);         /* the MAGIC invocation... */
 795         hghnum = msgnum = mp->hghmsg;
 796         for (i = 0;;) {
 797             /*
 798              * Check if we need to allocate more space for message status.
 799              * If so, then add space for an additional 100 messages.
 800              */
 801             if (msgnum >= mp->hghoff
 802                 && !(mp = folder_realloc (mp, mp->lowoff, mp->hghoff + 100))) {
 803                 advise (NULL, "unable to allocate folder storage");
 804                 i = NOTOK;
 805                 break;
 806             }
 807
 808 #if 0
 809             /* copy file from spool to tmp file */
 810             tmpfilenam = m_scratch ("", invo_name);
 811             if ((fd = creat (tmpfilenam, m_gmprot ())) == NOTOK)
 812                 adios (tmpfilenam, "unable to create");
 813             chmod (tmpfilenam, m_gmprot ());
 814             if (!(in2 = fdopen (fd, "r+")))
 815                 adios (tmpfilenam, "unable to access");
 816             cpymsg (in, in2);
 817
 818             /* link message into folder */
 819             newmsg = folder_addmsg(mp, tmpfilenam);
 820 #endif
 821             /* create scanline for new message */
 822             switch (i = scan (in, msgnum + 1, msgnum + 1, nfs, width,
 823                               msgnum == hghnum && chgflag, 1, NULL, 0L, noisy)) {
 824             case SCNFAT:
 825             case SCNEOF:
 826                 break;
 827
 828             case SCNERR:
 829                 if (aud)
 830                     fputs ("inc aborted!\n", aud);
 831                 advise (NULL, "aborted!");      /* doesn't clean up locks! */
 832                 break;
 833
 834             case SCNNUM:
 835                 advise (NULL, "BUG in %s, number out of range", invo_name);
 836                 break;
 837
 838             default:
 839                 advise (NULL, "BUG in %s, scan() botch (%d)", invo_name, i);
 840                 break;
 841
 842             case SCNMSG:
 843             case SCNENC:
 844                 /*
 845                  *  Run the external program hook on the message.
 846                  */
 847
 848                 (void)snprintf(b, sizeof (b), "%s/%d", maildir_copy, msgnum + 1);
 849                 (void)ext_hook("add-hook", b, (char *)0);
 850
 851                 if (aud)
 852                     fputs (scanl, aud);
 853 #ifdef MHE
 854                 if (mhe)
 855                     fputs (scanl, mhe);
 856 #endif /* MHE */
 857                 if (noisy)
 858                     fflush (stdout);
 859
 860                 msgnum++;
 861                 mp->hghmsg++;
 862                 mp->nummsg++;
 863                 if (mp->lowmsg == 0) mp->lowmsg = 1;
 864
 865                 clear_msg_flags (mp, msgnum);
 866                 set_exists (mp, msgnum);
 867                 set_unseen (mp, msgnum);
 868                 mp->msgflags |= SEQMOD;
 869                 continue;
 870             }
 871             break;
 872         }
 873     }
 874
 875 #ifdef POP
 876     if (p < 0) {                /* error */
 877 #else
 878     if (i < 0) {                /* error */
 879 #endif
 880         if (locked) {
 881             GETGROUPPRIVS();      /* Be sure we can unlock mail file */
 882             (void) lkfclose (in, newmail); in = NULL;
 883             DROPGROUPPRIVS();    /* And then return us to normal privileges */
 884         } else {
 885             fclose (in); in = NULL;
 886         }
 887         adios (NULL, "failed");
 888     }
 889
 890     if (aud)
 891         fclose (aud);
 892
 893 #ifdef MHE
 894     if (mhe)
 895         fclose (mhe);
 896 #endif /* MHE */
 897
 898     if (noisy)
 899         fflush (stdout);
 900
 901 #ifdef POP
 902     if ((inc_type == INC_POP) && packfile)
 903         done (0);
 904 #endif /* POP */
 905
 906     /*
 907      * truncate file we are incorporating from
 908      */
 909     if (inc_type == INC_FILE) {
 910         if (trnflag) {
 911             if (stat (newmail, &st) != NOTOK && s1.st_mtime != st.st_mtime)
 912                 advise (NULL, "new messages have arrived!\007");
 913             else {
 914                 if ((i = creat (newmail, 0600)) != NOTOK)
 915                     close (i);
 916                 else
 917                     admonish (newmail, "error zero'ing");
 918                 unlink(map_name(newmail));
 919             }
 920         } else {
 921             if (noisy)
 922                 printf ("%s not zero'd\n", newmail);
 923         }
 924     }
 925
 926     if (msgnum == hghnum) {
 927         admonish (NULL, "no messages incorporated");
 928     } else {
 929         context_replace (pfolder, folder);      /* update current folder */
 930         if (chgflag)
 931             mp->curmsg = hghnum + 1;
 932         mp->hghmsg = msgnum;
 933         if (mp->lowmsg == 0)
 934             mp->lowmsg = 1;
 935         if (chgflag)            /* sigh... */
 936             seq_setcur (mp, mp->curmsg);
 937     }
 938
 939     /*
 940      * unlock the mail spool
 941      */
 942     if (inc_type == INC_FILE) {
 943         if (locked) {
 944            GETGROUPPRIVS();        /* Be sure we can unlock mail file */
 945            (void) lkfclose (in, newmail); in = NULL;
 946            DROPGROUPPRIVS();       /* And then return us to normal privileges */
 947         } else {
 948             fclose (in); in = NULL;
 949         }
 950     }
 951
 952     seq_setunseen (mp, 0);      /* set the Unseen-Sequence */
 953     seq_save (mp);              /* synchronize sequences   */
 954     context_save ();            /* save the context file   */
 955     done (0);
 956     return 1;
 957 }
 958
 959
 960 #if 0
 961
 962 /*
 963  * Copy message message from spool into
 964  * temporary file.  Massage the "From " line
 965  * while copying.
 966  */
 967
 968 cpymsg (FILE *in, FILE *out)
 969 {
 970     int state;
 971     char *tmpbuf, name[NAMESZ];
 972
 973     for (;;) {
 974         state = m_getfld (state, name, tmpbuf, rlwidth, in);
 975         switch (state) {
 976         case FLD:
 977         case FLDPLUS:
 978             break;
 979         case BODY:
 980             break;
 981         case LENERR:
 982         case FMTERR:
 983             break;
 984         case FILEEOF:
 985             break;
 986         default:
 987         }
 988     }
 989 }
 990 #endif /* if 0 */
 991
 992
 993 static void
 994 inc_done (int status)
 995 {
 996 #ifdef POP
 997     if (packfile && pd != NOTOK)
 998         mbx_close (packfile, pd);
 999 #endif /* POP */
1000     if (locked)
1001     {
1002         GETGROUPPRIVS();
1003         lkfclose(in, newmail);
1004         DROPGROUPPRIVS();
1005     }
1006     exit (status);
1007 }
1008
1009 #ifdef POP
1010 static int
1011 pop_action (char *s)
1012 {
1013     fprintf (pf, "%s\n", s);
1014     stop += strlen (s) + 1;
1015     return 0;  /* Is return value used?  This was missing before 1999-07-15. */
1016 }
1017
1018 static int
1019 pop_pack (char *s)
1020 {
1021     int j;
1022     char buffer[BUFSIZ];
1023
1024     snprintf (buffer, sizeof(buffer), "%s\n", s);
1025     for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
1026         continue;
1027     for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
1028         continue;
1029     fputs (buffer, pf);
1030     size += strlen (buffer) + 1;
1031     return 0;  /* Is return value used?  This was missing before 1999-07-15. */
1032 }
1033
1034 static int
1035 map_count (void)
1036 {
1037     int md;
1038     char *cp;
1039     struct drop d;
1040     struct stat st;
1041
1042     if (stat (packfile, &st) == NOTOK)
1043         return 0;
1044     if ((md = open (cp = map_name (packfile), O_RDONLY)) == NOTOK
1045             || map_chk (cp, md, &d, (long) st.st_size, 1)) {
1046         if (md != NOTOK)
1047             close (md);
1048         return 0;
1049     }
1050     close (md);
1051     return (d.d_id);
1052 }
1053 #endif /* POP */