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