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 /*
  12  * Thu Feb 12 21:00 CST 2015            Marcin Cieslak <saper@saper.info>
  13  *    Replaced setgid() calls with setegid() so that it works with dot
  14  *    locking on FreeBSD.  setegid() should be supported on modern POSIX
  15  *    systems.
  16  *
  17  * Revised: Sat Apr 14 17:08:17 PDT 1990 (marvit@hplabs)
  18  *    Added hpux hacks to set and reset gid to be "mail" as needed. The reset
  19  *    is necessary so inc'ed mail is the group of the inc'er, rather than
  20  *    "mail". We setgid to egid only when [un]locking the mail file. This
  21  *    is also a major security precaution which will not be explained here.
  22  *
  23  * Fri Feb  7 16:04:57 PST 1992         John Romine <bug-mh@ics.uci.edu>
  24  *   NB: I'm not 100% sure that this setgid stuff is secure even now.
  25  *
  26  * See the *GROUPPRIVS() macros later. I'm reasonably happy with the setgid
  27  * attribute. Running setuid root is probably not a terribly good idea, though.
  28  *       -- Peter Maydell <pmaydell@chiark.greenend.org.uk>, 04/1998
  29  *
  30  * Peter Maydell's patch slightly modified for nmh 0.28-pre2.
  31  * Ruud de Rooij <ruud@debian.org>  Wed, 22 Jul 1998 13:24:22 +0200
  32  */
  33 #endif
  34
  35 #include <h/mh.h>
  36 #include <h/utils.h>
  37 #include <fcntl.h>
  38 #include <h/dropsbr.h>
  39 #include <h/popsbr.h>
  40 #include <h/fmt_scan.h>
  41 #include <h/scansbr.h>
  42 #include <h/signals.h>
  43 #include <h/tws.h>
  44 #include <h/mts.h>
  45
  46 #ifndef CYRUS_SASL
  47 # define SASLminc(a) (a)
  48 #else
  49 # define SASLminc(a)  0
  50 #endif
  51
  52 #define INC_SWITCHES \
  53     X("audit audit-file", 0, AUDSW) \
  54     X("noaudit", 0, NAUDSW) \
  55     X("changecur", 0, CHGSW) \
  56     X("nochangecur", 0, NCHGSW) \
  57     X("file name", 0, FILESW) \
  58     X("form formatfile", 0, FORMSW) \
  59     X("format string", 5, FMTSW) \
  60     X("host hostname", 0, HOSTSW) \
  61     X("user username", 0, USERSW) \
  62     X("pack file", 0, PACKSW) \
  63     X("nopack", 0, NPACKSW) \
  64     X("port name/number", 0, PORTSW) \
  65     X("silent", 0, SILSW) \
  66     X("nosilent", 0, NSILSW) \
  67     X("truncate", 0, TRNCSW) \
  68     X("notruncate", 0, NTRNCSW) \
  69     X("width columns", 0, WIDTHSW) \
  70     X("version", 0, VERSIONSW) \
  71     X("help", 0, HELPSW) \
  72     X("snoop", -5, SNOOPSW) \
  73     X("sasl", SASLminc(-4), SASLSW) \
  74     X("nosasl", SASLminc(-6), NOSASLSW) \
  75     X("saslmech", SASLminc(-8), SASLMECHSW) \
  76     X("proxy command", 0, PROXYSW) \
  77
  78 #define X(sw, minchars, id) id,
  79 DEFINE_SWITCH_ENUM(INC);
  80 #undef X
  81
  82 #define X(sw, minchars, id) { sw, minchars, id },
  83 DEFINE_SWITCH_ARRAY(INC, switches);
  84 #undef X
  85
  86 /*
  87  * flags for the mail source
  88  */
  89 #define INC_FILE  0
  90 #define INC_POP   1
  91
  92 static int inc_type;
  93 static struct Maildir_entry {
  94         char *filename;
  95         time_t mtime;
  96 } *Maildir = NULL;
  97 static int num_maildir_entries = 0;
  98 static int snoop = 0;
  99
 100 extern char response[];
 101
 102 static int size;
 103 static long pos;
 104
 105 static int mbx_style = MMDF_FORMAT;
 106 static int pd = NOTOK;
 107
 108 static long start;
 109 static long stop;
 110
 111 static char *packfile = NULL;
 112 static FILE *pf = NULL;
 113
 114 /* This is an attempt to simplify things by putting all the
 115  * privilege ops into macros.
 116  * *GROUPPRIVS() is related to handling the setgid MAIL property,
 117  * and only applies if MAILGROUP is defined.
 118  * Basically, SAVEGROUPPRIVS() is called right at the top of main()
 119  * to initialise things, and then DROPGROUPPRIVS() and GETGROUPPRIVS()
 120  * do the obvious thing.
 121  *
 122  * There's probably a better implementation if we're allowed to use
 123  * BSD-style setreuid() rather than using POSIX saved-ids.
 124  * Anyway, if you're euid root it's a bit pointless to drop the group
 125  * permissions...
 126  *
 127  * I'm pretty happy that the security is good provided we aren't setuid root.
 128  * The only things we trust with group=mail privilege are lkfopen()
 129  * and lkfclose().
 130  */
 131
 132 /*
 133  * For setting and returning to "mail" gid
 134  */
 135 #ifdef MAILGROUP
 136 static gid_t return_gid;
 137 #define TRYDROPGROUPPRIVS() DROPGROUPPRIVS()
 138 #define DROPGROUPPRIVS() \
 139     if (setegid(getgid()) != 0) { \
 140         adios ("setegid", "unable to restore group to %ld", (long) getgid()); \
 141     }
 142 #define GETGROUPPRIVS() \
 143     if (setegid(return_gid) != 0) { \
 144         adios ("setegid", "unable to set group to %ld", (long) return_gid); \
 145     }
 146 #define SAVEGROUPPRIVS() return_gid = getegid()
 147 #else
 148 /* define *GROUPPRIVS() as null; this avoids having lots of "#ifdef MAILGROUP"s */
 149 #define TRYDROPGROUPPRIVS()
 150 #define DROPGROUPPRIVS()
 151 #define GETGROUPPRIVS()
 152 #define SAVEGROUPPRIVS()
 153 #endif /* not MAILGROUP */
 154
 155 /* these variables have to be globals so that done() can correctly clean up the lockfile */
 156 static int locked = 0;
 157 static char *newmail;
 158 static FILE *in;
 159
 160 /*
 161  * prototypes
 162  */
 163 char *map_name(char *);
 164
 165 static void inc_done(int) NORETURN;
 166 static int pop_action(char *);
 167 static int pop_pack(char *);
 168 static int map_count(void);
 169
 170 int
 171 maildir_srt(const void *va, const void *vb)
 172 {
 173     const struct Maildir_entry *a = va, *b = vb;
 174     if (a->mtime > b->mtime)
 175       return 1;
 176     else if (a->mtime < b->mtime)
 177       return -1;
 178     else
 179       return 0;
 180 }
 181
 182 int
 183 main (int argc, char **argv)
 184 {
 185     int chgflag = 1, trnflag = 1;
 186     int noisy = 1, width = -1;
 187     int hghnum = 0, msgnum = 0;
 188     int sasl = 0;
 189     int incerr = 0; /* <0 if inc hits an error which means it should not truncate mailspool */
 190     char *cp, *maildir = NULL, *folder = NULL;
 191     char *format = NULL, *form = NULL;
 192     char *host = NULL, *port = NULL, *user = NULL, *proxy = NULL;
 193     char *audfile = NULL, *from = NULL, *saslmech = NULL;
 194     char buf[BUFSIZ], **argp, *nfs, **arguments;
 195     struct msgs *mp = NULL;
 196     struct stat st, s1;
 197     FILE *aud = NULL;
 198     char b[PATH_MAX + 1];
 199     char *maildir_copy = NULL;  /* copy of mail directory because the static gets overwritten */
 200
 201     int nmsgs, nbytes;
 202     char *MAILHOST_env_variable;
 203
 204     done=inc_done;
 205
 206 /* absolutely the first thing we do is save our privileges,
 207  * and drop them if we can.
 208  */
 209     SAVEGROUPPRIVS();
 210     TRYDROPGROUPPRIVS();
 211
 212     if (nmh_init(argv[0], 1)) { return 1; }
 213
 214     mts_init (invo_name);
 215     arguments = getarguments (invo_name, argc, argv, 1);
 216     argp = arguments;
 217
 218     /*
 219      * Scheme is:
 220      *        use MAILHOST environment variable if present,
 221      *  else try Hesiod.
 222      *  If that fails, use the default (if any)
 223      *  provided by mts.conf in mts_init()
 224      */
 225     if ((MAILHOST_env_variable = getenv("MAILHOST")) != NULL)
 226         pophost = MAILHOST_env_variable;
 227     /*
 228      * If there is a valid "pophost" entry in mts.conf,
 229      * then use it as the default host.
 230      */
 231     if (pophost && *pophost)
 232         host = pophost;
 233
 234     while ((cp = *argp++)) {
 235         if (*cp == '-') {
 236             switch (smatch (++cp, switches)) {
 237             case AMBIGSW:
 238                 ambigsw (cp, switches);
 239                 done (1);
 240             case UNKWNSW:
 241                 adios (NULL, "-%s unknown", cp);
 242
 243             case HELPSW:
 244                 snprintf (buf, sizeof(buf), "%s [+folder] [switches]", invo_name);
 245                 print_help (buf, switches, 1);
 246                 done (0);
 247             case VERSIONSW:
 248                 print_version(invo_name);
 249                 done (0);
 250
 251             case AUDSW:
 252                 if (!(cp = *argp++) || *cp == '-')
 253                     adios (NULL, "missing argument to %s", argp[-2]);
 254                 audfile = getcpy (m_maildir (cp));
 255                 continue;
 256             case NAUDSW:
 257                 audfile = NULL;
 258                 continue;
 259
 260             case CHGSW:
 261                 chgflag++;
 262                 continue;
 263             case NCHGSW:
 264                 chgflag = 0;
 265                 continue;
 266
 267             /*
 268              * The flag `trnflag' has the value:
 269              *
 270              * 2 if -truncate is given
 271              * 1 by default (truncating is default)
 272              * 0 if -notruncate is given
 273              */
 274             case TRNCSW:
 275                 trnflag = 2;
 276                 continue;
 277             case NTRNCSW:
 278                 trnflag = 0;
 279                 continue;
 280
 281             case FILESW:
 282                 if (!(cp = *argp++) || *cp == '-')
 283                     adios (NULL, "missing argument to %s", argp[-2]);
 284                 from = path (cp, TFILE);
 285
 286                 /*
 287                  * If the truncate file is in default state,
 288                  * change to not truncate.
 289                  */
 290                 if (trnflag == 1)
 291                     trnflag = 0;
 292                 continue;
 293
 294             case SILSW:
 295                 noisy = 0;
 296                 continue;
 297             case NSILSW:
 298                 noisy++;
 299                 continue;
 300
 301             case FORMSW:
 302                 if (!(form = *argp++) || *form == '-')
 303                     adios (NULL, "missing argument to %s", argp[-2]);
 304                 format = NULL;
 305                 continue;
 306             case FMTSW:
 307                 if (!(format = *argp++) || *format == '-')
 308                     adios (NULL, "missing argument to %s", argp[-2]);
 309                 form = NULL;
 310                 continue;
 311
 312             case WIDTHSW:
 313                 if (!(cp = *argp++) || *cp == '-')
 314                     adios (NULL, "missing argument to %s", argp[-2]);
 315                 width = atoi (cp);
 316                 continue;
 317
 318             case HOSTSW:
 319                 if (!(host = *argp++) || *host == '-')
 320                     adios (NULL, "missing argument to %s", argp[-2]);
 321                 continue;
 322
 323             case PORTSW:
 324                 if (!(port = *argp++) || *port == '-')
 325                     adios (NULL, "missing argument to %s", argp[-2]);
 326                 continue;
 327
 328             case USERSW:
 329                 if (!(user = *argp++) || *user == '-')
 330                     adios (NULL, "missing argument to %s", argp[-2]);
 331                 continue;
 332
 333             case PACKSW:
 334                 if (!(packfile = *argp++) || *packfile == '-')
 335                     adios (NULL, "missing argument to %s", argp[-2]);
 336                 continue;
 337             case NPACKSW:
 338                 packfile = NULL;
 339                 continue;
 340
 341             case SNOOPSW:
 342                 snoop++;
 343                 continue;
 344
 345             case SASLSW:
 346                 sasl++;
 347                 continue;
 348             case NOSASLSW:
 349                 sasl = 0;
 350                 continue;
 351
 352             case SASLMECHSW:
 353                 if (!(saslmech = *argp++) || *saslmech == '-')
 354                     adios (NULL, "missing argument to %s", argp[-2]);
 355                 continue;
 356             case PROXYSW:
 357                 if (!(proxy = *argp++) || *proxy == '-')
 358                     adios (NULL, "missing argument to %s", argp[-2]);
 359                 continue;
 360             }
 361         }
 362         if (*cp == '+' || *cp == '@') {
 363             if (folder)
 364                 adios (NULL, "only one folder at a time!");
 365             else
 366                 folder = pluspath (cp);
 367         } else {
 368             adios (NULL, "usage: %s [+folder] [switches]", invo_name);
 369         }
 370     }
 371
 372     /* NOTE: above this point you should use TRYDROPGROUPPRIVS(),
 373      * not DROPGROUPPRIVS().
 374      */
 375     if (host && !*host)
 376         host = NULL;
 377
 378     /* guarantee dropping group priveleges; we might not have done so earlier */
 379     DROPGROUPPRIVS();
 380
 381     /*
 382      * Where are we getting the new mail?
 383      */
 384     if (from)
 385         inc_type = INC_FILE;
 386     else if (host)
 387         inc_type = INC_POP;
 388     else
 389         inc_type = INC_FILE;
 390
 391     /*
 392      * Are we getting the mail from
 393      * a POP server?
 394      */
 395     if (inc_type == INC_POP) {
 396         struct nmh_creds creds = { 0, 0, 0 };
 397
 398         /*
 399          * initialize POP connection
 400          */
 401         nmh_get_credentials (host, user, sasl, &creds);
 402         if (pop_init (host, port, creds.user, creds.password, proxy, snoop,
 403                       sasl, saslmech) == NOTOK)
 404             adios (NULL, "%s", response);
 405
 406         /* Check if there are any messages */
 407         if (pop_stat (&nmsgs, &nbytes) == NOTOK)
 408             adios (NULL, "%s", response);
 409
 410         if (nmsgs == 0) {
 411             pop_quit();
 412             adios (NULL, "no mail to incorporate");
 413         }
 414     }
 415
 416     /*
 417      * We will get the mail from a file
 418      * (typically the standard maildrop)
 419      */
 420
 421     if (inc_type == INC_FILE) {
 422         if (from)
 423             newmail = from;
 424         else if ((newmail = getenv ("MAILDROP")) && *newmail)
 425             newmail = m_mailpath (newmail);
 426         else if ((newmail = context_find ("maildrop")) && *newmail)
 427             newmail = m_mailpath (newmail);
 428         else {
 429             newmail = concat (MAILDIR, "/", MAILFIL, NULL);
 430         }
 431         if (stat (newmail, &s1) == NOTOK || s1.st_size == 0)
 432             adios (NULL, "no mail to incorporate");
 433         if (s1.st_mode & S_IFDIR) {
 434             DIR *md;
 435             struct dirent *de;
 436             struct stat ms;
 437             int i;
 438             i = 0;
 439             cp = concat (newmail, "/new", NULL);
 440             if ((md = opendir(cp)) == NULL)
 441                 adios (NULL, "unable to open %s", cp);
 442             while ((de = readdir (md)) != NULL) {
 443                 if (de->d_name[0] == '.')
 444                     continue;
 445                 if (i >= num_maildir_entries) {
 446                     if ((Maildir = realloc(Maildir, sizeof(*Maildir) * (2*i+16))) == NULL)
 447                         adios(NULL, "not enough memory for %d messages", 2*i+16);
 448                     num_maildir_entries = 2*i+16;
 449                 }
 450                 Maildir[i].filename = concat (cp, "/", de->d_name, NULL);
 451                 if (stat(Maildir[i].filename, &ms) != 0)
 452                    adios (Maildir[i].filename, "couldn't get delivery time");
 453                 Maildir[i].mtime = ms.st_mtime;
 454                 i++;
 455             }
 456             free (cp);
 457             closedir (md);
 458             cp = concat (newmail, "/cur", NULL);
 459             if ((md = opendir(cp)) == NULL)
 460                 adios (NULL, "unable to open %s", cp);
 461             while ((de = readdir (md)) != NULL) {
 462                 if (de->d_name[0] == '.')
 463                     continue;
 464                 if (i >= num_maildir_entries) {
 465                     if ((Maildir = realloc(Maildir, sizeof(*Maildir) * (2*i+16))) == NULL)
 466                         adios(NULL, "not enough memory for %d messages", 2*i+16);
 467                     num_maildir_entries = 2*i+16;
 468                 }
 469                 Maildir[i].filename = concat (cp, "/", de->d_name, NULL);
 470                 if (stat(Maildir[i].filename, &ms) != 0)
 471                    adios (Maildir[i].filename, "couldn't get delivery time");
 472                 Maildir[i].mtime = ms.st_mtime;
 473                 i++;
 474             }
 475             free (cp);
 476             closedir (md);
 477             if (i == 0)
 478                 adios (NULL, "no mail to incorporate");
 479             num_maildir_entries = i;
 480             qsort (Maildir, num_maildir_entries, sizeof(*Maildir), maildir_srt);
 481         }
 482
 483         if ((cp = strdup(newmail)) == (char *)0)
 484             adios (NULL, "error allocating memory to copy newmail");
 485
 486         newmail = cp;
 487     }
 488
 489     /* skip the folder setup */
 490     if ((inc_type == INC_POP) && packfile)
 491         goto go_to_it;
 492
 493     if (!context_find ("path"))
 494         free (path ("./", TFOLDER));
 495     if (!folder)
 496         folder = getfolder (0);
 497     maildir = m_maildir (folder);
 498
 499     if ((maildir_copy = strdup(maildir)) == (char *)0)
 500         adios (maildir, "error allocating memory to copy maildir");
 501
 502     if (!folder_exists(maildir)) {
 503         /* If the folder doesn't exist, and we're given the -silent flag,
 504          * just fail.
 505          */
 506         if (noisy)
 507             create_folder(maildir, 0, done);
 508         else
 509             done (1);
 510     }
 511
 512     if (chdir (maildir) == NOTOK)
 513         adios (maildir, "unable to change directory to");
 514
 515     /* read folder and create message structure */
 516     if (!(mp = folder_read (folder, 0)))
 517         adios (NULL, "unable to read folder %s", folder);
 518
 519 go_to_it:
 520
 521     if (inc_type == INC_FILE && Maildir == NULL) {
 522         if (access (newmail, W_OK) != NOTOK) {
 523             locked++;
 524             if (trnflag) {
 525                 SIGNAL (SIGHUP, SIG_IGN);
 526                 SIGNAL (SIGINT, SIG_IGN);
 527                 SIGNAL (SIGQUIT, SIG_IGN);
 528                 SIGNAL (SIGTERM, SIG_IGN);
 529             }
 530
 531             GETGROUPPRIVS();       /* Reset gid to lock mail file */
 532             in = lkfopenspool (newmail, "r");
 533             DROPGROUPPRIVS();
 534             if (in == NULL)
 535                 adios (NULL, "unable to lock and fopen %s", newmail);
 536             fstat (fileno(in), &s1);
 537         } else {
 538             trnflag = 0;
 539             if ((in = fopen (newmail, "r")) == NULL)
 540                 adios (newmail, "unable to read");
 541         }
 542     }
 543
 544     /* This shouldn't be necessary but it can't hurt. */
 545     DROPGROUPPRIVS();
 546
 547     if (audfile) {
 548         int i;
 549         if ((i = stat (audfile, &st)) == NOTOK)
 550             advise (NULL, "Creating Receive-Audit: %s", audfile);
 551         if ((aud = fopen (audfile, "a")) == NULL)
 552             adios (audfile, "unable to append to");
 553         else if (i == NOTOK)
 554             chmod (audfile, m_gmprot ());
 555
 556         if (from)
 557             fprintf (aud, "<<inc>> %s -ms %s\n", dtimenow(0), from);
 558         else {
 559             if (host)
 560                 fprintf (aud, "<<inc>> %s -host %s -user %s\n", dtimenow(0),
 561                          host, user);
 562             else
 563                 fprintf (aud, "<<inc>> %s\n", dtimenow (0));
 564         }
 565     }
 566
 567     /* Get new format string */
 568     nfs = new_fs (form, format, FORMAT);
 569
 570     if (noisy) {
 571         printf ("Incorporating new mail into %s...\n\n", folder);
 572         fflush (stdout);
 573     }
 574
 575
 576     /*
 577      * Get the mail from a POP server
 578      */
 579     if (inc_type == INC_POP) {
 580         int i;
 581         if (packfile) {
 582             packfile = path (packfile, TFILE);
 583             if (stat (packfile, &st) == NOTOK) {
 584                 if (errno != ENOENT)
 585                     adios (packfile, "error on file");
 586                 cp = concat ("Create file \"", packfile, "\"? ", NULL);
 587                 if (noisy && !getanswer (cp))
 588                     done (1);
 589                 free (cp);
 590             }
 591             msgnum = map_count ();
 592             if ((pd = mbx_open (packfile, mbx_style, getuid(), getgid(), m_gmprot()))
 593                 == NOTOK)
 594                 adios (packfile, "unable to open");
 595             if ((pf = fdopen (pd, "w+")) == NULL)
 596                 adios (NULL, "unable to fdopen %s", packfile);
 597         } else {
 598             hghnum = msgnum = mp->hghmsg;
 599         }
 600
 601         for (i = 1; i <= nmsgs; i++) {
 602             charstring_t scanl = NULL;
 603
 604             msgnum++;
 605             if (packfile) {
 606                 fseek (pf, 0L, SEEK_CUR);
 607                 pos = ftell (pf);
 608                 size = 0;
 609                 if (fwrite (mmdlm1, 1, strlen (mmdlm1), pf) < strlen (mmdlm1)) {
 610                     advise (mmdlm1, "fwrite");
 611                 }
 612                 start = ftell (pf);
 613
 614                 if (pop_retr (i, pop_pack) == NOTOK)
 615                     adios (NULL, "%s", response);
 616
 617                 fseek (pf, 0L, SEEK_CUR);
 618                 stop = ftell (pf);
 619                 if (fflush (pf))
 620                     adios (packfile, "write error on");
 621                 fseek (pf, start, SEEK_SET);
 622             } else {
 623                 cp = getcpy (m_name (msgnum));
 624                 if ((pf = fopen (cp, "w+")) == NULL)
 625                     adios (cp, "unable to write");
 626                 chmod (cp, m_gmprot ());
 627                 start = stop = 0L;
 628
 629                 if (pop_retr (i, pop_action) == NOTOK)
 630                     adios (NULL, "%s", response);
 631
 632                 if (fflush (pf))
 633                     adios (cp, "write error on");
 634                 fseek (pf, 0L, SEEK_SET);
 635             }
 636             switch (incerr = scan (pf, msgnum, 0, nfs, width,
 637                               packfile ? 0 : msgnum == mp->hghmsg + 1 && chgflag,
 638                               1, NULL, stop - start, noisy, &scanl)) {
 639             case SCNEOF:
 640                 printf ("%*d  empty\n", DMAXFOLDER, msgnum);
 641                 break;
 642
 643             case SCNFAT:
 644                 trnflag = 0;
 645                 noisy++;
 646                 /* advise (cp, "unable to read"); already advised */
 647                 /* fall thru */
 648
 649             case SCNERR:
 650             case SCNNUM:
 651                 break;
 652
 653             case SCNMSG:
 654             case SCNENC:
 655             default:
 656                 if (aud)
 657                     fputs (charstring_buffer (scanl), aud);
 658                 if (noisy)
 659                     fflush (stdout);
 660                 break;
 661             }
 662             charstring_free (scanl);
 663
 664             if (packfile) {
 665                 fseek (pf, stop, SEEK_SET);
 666                 if (fwrite (mmdlm2, 1, strlen (mmdlm2), pf) < strlen (mmdlm1)) {
 667                     advise (mmdlm2, "fwrite");
 668                 }
 669                 if (fflush (pf) || ferror (pf)) {
 670                     int e = errno;
 671                     pop_quit ();
 672                     errno = e;
 673                     adios (packfile, "write error on");
 674                 }
 675                 map_write (packfile, pd, 0, 0L, start, stop, pos, size, noisy);
 676             } else {
 677                 if (ferror(pf) || fclose (pf)) {
 678                     int e = errno;
 679                     (void) m_unlink (cp);
 680                     pop_quit ();
 681                     errno = e;
 682                     adios (cp, "write error on");
 683                 }
 684                 free (cp);
 685             }
 686
 687             if (trnflag && pop_dele (i) == NOTOK)
 688                 adios (NULL, "%s", response);
 689
 690             scan_finished();
 691         }
 692
 693         if (pop_quit () == NOTOK)
 694             adios (NULL, "%s", response);
 695         if (packfile) {
 696             mbx_close (packfile, pd);
 697             pd = NOTOK;
 698         }
 699     }
 700
 701     /*
 702      * Get the mail from file (usually mail spool)
 703      */
 704     if (inc_type == INC_FILE && Maildir == NULL) {
 705         scan_detect_mbox_style (in);            /* the MAGIC invocation... */
 706         hghnum = msgnum = mp->hghmsg;
 707         for (;;) {
 708             charstring_t scanl = NULL;
 709
 710             /* create scanline for new message */
 711             switch (incerr = scan (in, msgnum + 1, msgnum + 1, nfs, width,
 712                               msgnum == hghnum && chgflag, 1, NULL, 0L, noisy,
 713                               &scanl)) {
 714             case SCNFAT:
 715             case SCNEOF:
 716                 break;
 717
 718             case SCNERR:
 719                 if (aud)
 720                     fputs ("inc aborted!\n", aud);
 721                 advise (NULL, "aborted!");      /* doesn't clean up locks! */
 722                 break;
 723
 724             case SCNNUM:
 725                 advise (NULL, "BUG in %s, number out of range", invo_name);
 726                 break;
 727
 728             default:
 729                 advise (NULL, "BUG in %s, scan() botch (%d)", invo_name, incerr);
 730                 break;
 731
 732             case SCNMSG:
 733             case SCNENC:
 734                 /*
 735                  *  Run the external program hook on the message.
 736                  */
 737
 738                 (void)snprintf(b, sizeof (b), "%s/%d", maildir_copy, msgnum + 1);
 739                 (void)ext_hook("add-hook", b, (char *)0);
 740
 741                 if (aud)
 742                     fputs (charstring_buffer (scanl), aud);
 743                 if (noisy)
 744                     fflush (stdout);
 745
 746                 msgnum++;
 747                 continue;
 748             }
 749             charstring_free (scanl);
 750
 751             /* If we get here there was some sort of error from scan(),
 752              * so stop processing anything more from the spool.
 753              */
 754             break;
 755         }
 756     } else if (inc_type == INC_FILE) { /* Maildir inbox to process */
 757         char *sp;
 758         FILE *sf;
 759         int i;
 760
 761         hghnum = msgnum = mp->hghmsg;
 762         for (i = 0; i < num_maildir_entries; i++) {
 763             charstring_t scanl = NULL;
 764
 765             msgnum++;
 766
 767             sp = Maildir[i].filename;
 768             cp = getcpy (m_name (msgnum));
 769             pf = NULL;
 770             if (!trnflag || link(sp, cp) == -1) {
 771                 static char buf[65536];
 772                 size_t nrd;
 773
 774                 if ((sf = fopen (sp, "r")) == NULL)
 775                     adios (sp, "unable to read for copy");
 776                 if ((pf = fopen (cp, "w+")) == NULL)
 777                     adios (cp, "unable to write for copy");
 778                 while ((nrd = fread(buf, 1, sizeof(buf), sf)) > 0)
 779                     if (fwrite(buf, 1, nrd, pf) != nrd)
 780                         break;
 781                 if (ferror(sf) || fflush(pf) || ferror(pf)) {
 782                         int e = errno;
 783                         fclose(pf); fclose(sf); (void) m_unlink(cp);
 784                         errno = e;
 785                         adios(cp, "copy error %s -> %s", sp, cp);
 786                 }
 787                 fclose (sf);
 788                 sf = NULL;
 789             }
 790             if (pf == NULL && (pf = fopen (cp, "r")) == NULL)
 791                 adios (cp, "not available");
 792             chmod (cp, m_gmprot ());
 793
 794             fseek (pf, 0L, SEEK_SET);
 795             switch (incerr = scan (pf, msgnum, 0, nfs, width,
 796                               msgnum == mp->hghmsg + 1 && chgflag,
 797                               1, NULL, stop - start, noisy, &scanl)) {
 798             case SCNEOF:
 799                 printf ("%*d  empty\n", DMAXFOLDER, msgnum);
 800                 break;
 801
 802             case SCNFAT:
 803                 trnflag = 0;
 804                 noisy++;
 805                 /* advise (cp, "unable to read"); already advised */
 806                 /* fall thru */
 807
 808             case SCNERR:
 809             case SCNNUM:
 810                 break;
 811
 812             case SCNMSG:
 813             case SCNENC:
 814             default:
 815                 /*
 816                  *  Run the external program hook on the message.
 817                  */
 818
 819                 (void)snprintf(b, sizeof (b), "%s/%d", maildir_copy, msgnum + 1);
 820                 (void)ext_hook("add-hook", b, (char *)0);
 821
 822                 if (aud)
 823                     fputs (charstring_buffer (scanl), aud);
 824                 if (noisy)
 825                     fflush (stdout);
 826                 break;
 827             }
 828             charstring_free (scanl);
 829
 830             if (ferror(pf) || fclose (pf)) {
 831                 int e = errno;
 832                 (void) m_unlink (cp);
 833                 errno = e;
 834                 adios (cp, "write error on");
 835             }
 836             pf = NULL;
 837             free (cp);
 838
 839             if (trnflag && m_unlink (sp) == NOTOK)
 840                 adios (sp, "couldn't unlink");
 841             free (sp); /* Free Maildir[i]->filename */
 842
 843             scan_finished();
 844         }
 845         free (Maildir); /* From now on Maildir is just a flag - don't dref! */
 846     }
 847
 848     scan_finished ();
 849
 850     if (incerr < 0) {           /* error */
 851         if (locked) {
 852             GETGROUPPRIVS();      /* Be sure we can unlock mail file */
 853             (void) lkfclosespool (in, newmail); in = NULL;
 854             DROPGROUPPRIVS();    /* And then return us to normal privileges */
 855         } else {
 856             fclose (in); in = NULL;
 857         }
 858         adios (NULL, "failed");
 859     }
 860
 861     if (aud)
 862         fclose (aud);
 863
 864     if (noisy)
 865         fflush (stdout);
 866
 867     if ((inc_type == INC_POP) && packfile)
 868         done (0);
 869
 870     /*
 871      * truncate file we are incorporating from
 872      */
 873     if (inc_type == INC_FILE && Maildir == NULL) {
 874         if (trnflag) {
 875             if (stat (newmail, &st) != NOTOK && s1.st_mtime != st.st_mtime)
 876                 advise (NULL, "new messages have arrived!\007");
 877             else {
 878                 int newfd;
 879                 if ((newfd = creat (newmail, 0600)) != NOTOK)
 880                     close (newfd);
 881                 else
 882                     admonish (newmail, "error zero'ing");
 883                 (void) m_unlink(map_name(newmail));
 884             }
 885         } else {
 886             if (noisy)
 887                 printf ("%s not zero'd\n", newmail);
 888         }
 889     }
 890
 891     if (msgnum == hghnum) {
 892         admonish (NULL, "no messages incorporated");
 893     } else {
 894         /*
 895          * Lock the sequence file now, and loop to set the right flags
 896          * in the folder structure
 897          */
 898
 899         struct msgs *mp2;
 900         int i;
 901
 902         context_replace (pfolder, folder);      /* update current folder */
 903
 904         if ((mp2 = folder_read(folder, 1)) == NULL) {
 905             admonish(NULL, "Unable to reread folder %s", folder);
 906             goto skip;
 907         }
 908
 909         /*
 910          * Shouldn't happen, but just in case ...
 911          */
 912
 913         if (msgnum >= mp2->hghoff
 914                 && !(mp2 = folder_realloc (mp2, mp2->lowoff, msgnum + 1))) {
 915             advise (NULL, "unable to reallocate folder storage");
 916             goto skip;
 917         }
 918
 919         if (chgflag)
 920             mp2->curmsg = hghnum + 1;
 921         mp2->hghmsg = msgnum;
 922
 923         if (mp2->lowmsg == 0)
 924             mp2->lowmsg = 1;
 925         if (chgflag)            /* sigh... */
 926             seq_setcur (mp2, mp2->curmsg);
 927
 928         for (i = hghnum + 1; i <= msgnum; i++) {
 929             clear_msg_flags (mp2, i);
 930             set_exists (mp2, i);
 931             set_unseen (mp2, i);
 932         }
 933         mp2->msgflags |= SEQMOD;
 934         seq_setunseen(mp2, 0);  /* Set the Unseen-Sequence */
 935         seq_save(mp2);          /* Save the sequence file */
 936         folder_free(mp2);
 937     }
 938 skip:
 939
 940     /*
 941      * unlock the mail spool
 942      */
 943     if (inc_type == INC_FILE && Maildir == NULL) {
 944         if (locked) {
 945            GETGROUPPRIVS();        /* Be sure we can unlock mail file */
 946            (void) lkfclosespool (in, newmail); in = NULL;
 947            DROPGROUPPRIVS();       /* And then return us to normal privileges */
 948         } else {
 949             fclose (in); in = NULL;
 950         }
 951     }
 952
 953     context_save ();            /* save the context file   */
 954     done (0);
 955     return 1;
 956 }
 957
 958
 959 static void
 960 inc_done (int status)
 961 {
 962     done = exit;
 963     if (packfile && pd != NOTOK)
 964         mbx_close (packfile, pd);
 965     if (locked)
 966     {
 967         GETGROUPPRIVS();
 968         lkfclosespool(in, newmail);
 969         DROPGROUPPRIVS();
 970     }
 971     exit (status);
 972 }
 973
 974 static int
 975 pop_action (char *s)
 976 {
 977     fprintf (pf, "%s\n", s);
 978     stop += strlen (s) + 1;
 979     return 0;  /* Is return value used?  This was missing before 1999-07-15. */
 980 }
 981
 982 static int
 983 pop_pack (char *s)
 984 {
 985     int j;
 986     char buffer[BUFSIZ];
 987
 988     snprintf (buffer, sizeof(buffer), "%s\n", s);
 989     for ( ; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
 990         continue;
 991     for ( ; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
 992         continue;
 993     fputs (buffer, pf);
 994     size += strlen (buffer) + 1;
 995     return 0;  /* Is return value used?  This was missing before 1999-07-15. */
 996 }
 997
 998 static int
 999 map_count (void)
1000 {
1001     int md;
1002     char *cp;
1003     struct drop d;
1004     struct stat st;
1005
1006     if (stat (packfile, &st) == NOTOK)
1007         return 0;
1008     if ((md = open (cp = map_name (packfile), O_RDONLY)) == NOTOK
1009             || map_chk (cp, md, &d, (long) st.st_size, 1)) {
1010         if (md != NOTOK)
1011             close (md);
1012         return 0;
1013     }
1014     close (md);
1015     return (d.d_id);
1016 }