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

   1
   2 /*
   3  * inc.c -- incorporate messages from a maildrop into a folder
   4  *
   5  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   6  * COPYRIGHT file in the root directory of the nmh distribution for
   7  * complete copyright information.
   8  */
   9
  10 #ifdef MAILGROUP
  11 /* Revised: Sat Apr 14 17:08:17 PDT 1990 (marvit@hplabs)
  12  *    Added hpux hacks to set and reset gid to be "mail" as needed. The reset
  13  *    is necessary so inc'ed mail is the group of the inc'er, rather than
  14  *    "mail". We setgid to egid only when [un]locking the mail file. This
  15  *    is also a major security precaution which will not be explained here.
  16  *
  17  * Fri Feb  7 16:04:57 PST 1992         John Romine <bug-mh@ics.uci.edu>
  18  *   NB: I'm not 100% sure that this setgid stuff is secure even now.
  19  *
  20  * See the *GROUPPRIVS() macros later. I'm reasonably happy with the setgid
  21  * attribute. Running setuid root is probably not a terribly good idea, though.
  22  *       -- Peter Maydell <pmaydell@chiark.greenend.org.uk>, 04/1998
  23  *
  24  * Peter Maydell's patch slightly modified for nmh 0.28-pre2.
  25  * Ruud de Rooij <ruud@debian.org>  Wed, 22 Jul 1998 13:24:22 +0200
  26  */
  27 #endif
  28
  29 #include <h/mh.h>
  30 #include <h/utils.h>
  31 #include <fcntl.h>
  32
  33 #ifdef POP
  34 # include <h/dropsbr.h>
  35 # include <h/popsbr.h>
  36 #endif
  37
  38 #include <h/fmt_scan.h>
  39 #include <h/scansbr.h>
  40 #include <h/signals.h>
  41 #include <h/tws.h>
  42 #include <h/mts.h>
  43 #include <errno.h>
  44 #include <signal.h>
  45
  46 #ifndef POP
  47 # define POPminc(a) (a)
  48 #else
  49 # define POPminc(a)  0
  50 #endif
  51
  52 #ifndef CYRUS_SASL
  53 # define SASLminc(a) (a)
  54 #else
  55 # define SASLminc(a)  0
  56 #endif
  57
  58 static struct swit switches[] = {
  59 #define AUDSW                      0
  60     { "audit audit-file", 0 },
  61 #define NAUDSW                     1
  62     { "noaudit", 0 },
  63 #define CHGSW                      2
  64     { "changecur", 0 },
  65 #define NCHGSW                     3
  66     { "nochangecur", 0 },
  67 #define FILESW                     4
  68     { "file name", 0 },
  69 #define FORMSW                     5
  70     { "form formatfile", 0 },
  71 #define FMTSW                      6
  72     { "format string", 5 },
  73 #define HOSTSW                     7
  74     { "host hostname", POPminc (-4) },
  75 #define USERSW                     8
  76     { "user username", POPminc (-4) },
  77 #define PACKSW                     9
  78     { "pack file", POPminc (-4) },
  79 #define NPACKSW                   10
  80     { "nopack", POPminc (-6) },
  81 #define PORTSW                    11
  82     { "port name/number", POPminc (-4) },
  83 #define SILSW                     12
  84     { "silent", 0 },
  85 #define NSILSW                    13
  86     { "nosilent", 0 },
  87 #define TRNCSW                    14
  88     { "truncate", 0 },
  89 #define NTRNCSW                   15
  90     { "notruncate", 0 },
  91 #define WIDTHSW                   16
  92     { "width columns", 0 },
  93 #define VERSIONSW                 17
  94     { "version", 0 },
  95 #define HELPSW                    18
  96     { "help", 0 },
  97 #define SNOOPSW                   19
  98     { "snoop", -5 },
  99 #define SASLSW                    20
 100     { "sasl", SASLminc(-4) },
 101 #define SASLMECHSW                21
 102     { "saslmech", SASLminc(-8) },
 103 #define PROXYSW                   22
 104     { "proxy command", POPminc(-5) },
 105     { NULL, 0 }
 106 };
 107
 108 /*
 109  * flags for the mail source
 110  */
 111 #define INC_FILE  0
 112 #define INC_POP   1
 113
 114 static int inc_type;
 115 static struct Maildir_entry {
 116         char *filename;
 117         time_t mtime;
 118 } *Maildir = NULL;
 119 static int num_maildir_entries = 0;
 120 static int snoop = 0;
 121
 122 #ifdef POP
 123 extern char response[];
 124
 125 static int size;
 126 static long pos;
 127
 128 static int mbx_style = MMDF_FORMAT;
 129 static int pd = NOTOK;
 130 #endif /* POP */
 131
 132 static long start;
 133 static long stop;
 134
 135 static char *packfile = NULL;
 136 static FILE *pf = NULL;
 137
 138 /* This is an attempt to simplify things by putting all the
 139  * privilege ops into macros.
 140  * *GROUPPRIVS() is related to handling the setgid MAIL property,
 141  * and only applies if MAILGROUP is defined.
 142  * *USERPRIVS() is related to handling the setuid root property,
 143  * and only applies if POP is defined [why does POP => setuid root?]
 144  * Basically, SAVEGROUPPRIVS() is called right at the top of main()
 145  * to initialise things, and then DROPGROUPPRIVS() and GETGROUPPRIVS()
 146  * do the obvious thing. TRYDROPGROUPPRIVS() has to be safe to call
 147  * before DROPUSERPRIVS() is called [this is needed because setgid()
 148  * sets both effective and real uids if euid is root.]
 149  *
 150  * There's probably a better implementation if we're allowed to use
 151  * BSD-style setreuid() rather than using POSIX saved-ids.
 152  * Anyway, if you're euid root it's a bit pointless to drop the group
 153  * permissions...
 154  *
 155  * I'm pretty happy that the security is good provided we aren't setuid root.
 156  * The only things we trust with group=mail privilege are lkfopen()
 157  * and lkfclose().
 158  */
 159
 160 /*
 161  * For setting and returning to "mail" gid
 162  */
 163 #ifdef MAILGROUP
 164 static int return_gid;
 165 #ifndef POP
 166 /* easy case; we're not setuid root, so can drop group privs
 167  * immediately.
 168  */
 169 #define TRYDROPGROUPPRIVS() DROPGROUPPRIVS()
 170 #else /* POP ie we are setuid root */
 171 #define TRYDROPGROUPPRIVS() \
 172 if (geteuid() != 0) DROPGROUPPRIVS()
 173 #endif
 174 #define DROPGROUPPRIVS() setgid(getgid())
 175 #define GETGROUPPRIVS() setgid(return_gid)
 176 #define SAVEGROUPPRIVS() return_gid = getegid()
 177 #else
 178 /* define *GROUPPRIVS() as null; this avoids having lots of "#ifdef MAILGROUP"s */
 179 #define TRYDROPGROUPPRIVS()
 180 #define DROPGROUPPRIVS()
 181 #define GETGROUPPRIVS()
 182 #define SAVEGROUPPRIVS()
 183 #endif /* not MAILGROUP */
 184
 185 /* these variables have to be globals so that done() can correctly clean up the lockfile */
 186 static int locked = 0;
 187 static char *newmail;
 188 static FILE *in;
 189
 190 /*
 191  * prototypes
 192  */
 193 char *map_name(char *);
 194
 195 static void inc_done(int) NORETURN;
 196 #ifdef POP
 197 static int pop_action(char *);
 198 static int pop_pack(char *);
 199 static int map_count(void);
 200 #endif
 201
 202 int
 203 maildir_srt(const void *va, const void *vb)
 204 {
 205     const struct Maildir_entry *a = va, *b = vb;
 206     if (a->mtime > b->mtime)
 207       return 1;
 208     else if (a->mtime < b->mtime)
 209       return -1;
 210     else
 211       return 0;
 212 }
 213
 214 int
 215 main (int argc, char **argv)
 216 {
 217     int chgflag = 1, trnflag = 1;
 218     int noisy = 1, width = 0;
 219     int hghnum = 0, msgnum = 0;
 220     int sasl = 0;
 221     int incerr = 0; /* <0 if inc hits an error which means it should not truncate mailspool */
 222     char *cp, *maildir = NULL, *folder = NULL;
 223     char *format = NULL, *form = NULL;
 224     char *host = NULL, *port = NULL, *user = NULL, *proxy = NULL;
 225     char *audfile = NULL, *from = NULL, *saslmech = NULL;
 226     char buf[BUFSIZ], **argp, *nfs, **arguments;
 227     struct msgs *mp = NULL;
 228     struct stat st, s1;
 229     FILE *aud = NULL;
 230     char b[MAXPATHLEN + 1];
 231     char *maildir_copy = NULL;  /* copy of mail directory because the static gets overwritten */
 232
 233 #ifdef POP
 234     int nmsgs, nbytes;
 235     char *pass = NULL;
 236     char *MAILHOST_env_variable;
 237 #endif
 238
 239 #ifdef MHE
 240     FILE *mhe = NULL;
 241 #endif
 242
 243     done=inc_done;
 244
 245 /* absolutely the first thing we do is save our privileges,
 246  * and drop them if we can.
 247  */
 248     SAVEGROUPPRIVS();
 249     TRYDROPGROUPPRIVS();
 250
 251 #ifdef LOCALE
 252     setlocale(LC_ALL, "");
 253 #endif
 254     invo_name = r1bindex (argv[0], '/');
 255
 256     /* read user profile/context */
 257     context_read();
 258
 259     mts_init (invo_name);
 260     arguments = getarguments (invo_name, argc, argv, 1);
 261     argp = arguments;
 262
 263 #ifdef POP
 264     /*
 265      * Scheme is:
 266      *        use MAILHOST environment variable if present,
 267      *  else try Hesiod.
 268      *  If that fails, use the default (if any)
 269      *  provided by mts.conf in mts_init()
 270      */
 271     if ((MAILHOST_env_variable = getenv("MAILHOST")) != NULL)
 272         pophost = MAILHOST_env_variable;
 273     /*
 274      * If there is a valid "pophost" entry in mts.conf,
 275      * then use it as the default host.
 276      */
 277     if (pophost && *pophost)
 278         host = pophost;
 279
 280     if ((cp = getenv ("MHPOPDEBUG")) && *cp)
 281         snoop++;
 282 #endif /* POP */
 283
 284     while ((cp = *argp++)) {
 285         if (*cp == '-') {
 286             switch (smatch (++cp, switches)) {
 287             case AMBIGSW:
 288                 ambigsw (cp, switches);
 289                 done (1);
 290             case UNKWNSW:
 291                 adios (NULL, "-%s unknown", cp);
 292
 293             case HELPSW:
 294                 snprintf (buf, sizeof(buf), "%s [+folder] [switches]", invo_name);
 295                 print_help (buf, switches, 1);
 296                 done (1);
 297             case VERSIONSW:
 298                 print_version(invo_name);
 299                 done (1);
 300
 301             case AUDSW:
 302                 if (!(cp = *argp++) || *cp == '-')
 303                     adios (NULL, "missing argument to %s", argp[-2]);
 304                 audfile = getcpy (m_maildir (cp));
 305                 continue;
 306             case NAUDSW:
 307                 audfile = NULL;
 308                 continue;
 309
 310             case CHGSW:
 311                 chgflag++;
 312                 continue;
 313             case NCHGSW:
 314                 chgflag = 0;
 315                 continue;
 316
 317             /*
 318              * The flag `trnflag' has the value:
 319              *
 320              * 2 if -truncate is given
 321              * 1 by default (truncating is default)
 322              * 0 if -notruncate is given
 323              */
 324             case TRNCSW:
 325                 trnflag = 2;
 326                 continue;
 327             case NTRNCSW:
 328                 trnflag = 0;
 329                 continue;
 330
 331             case FILESW:
 332                 if (!(cp = *argp++) || *cp == '-')
 333                     adios (NULL, "missing argument to %s", argp[-2]);
 334                 from = path (cp, TFILE);
 335
 336                 /*
 337                  * If the truncate file is in default state,
 338                  * change to not truncate.
 339                  */
 340                 if (trnflag == 1)
 341                     trnflag = 0;
 342                 continue;
 343
 344             case SILSW:
 345                 noisy = 0;
 346                 continue;
 347             case NSILSW:
 348                 noisy++;
 349                 continue;
 350
 351             case FORMSW:
 352                 if (!(form = *argp++) || *form == '-')
 353                     adios (NULL, "missing argument to %s", argp[-2]);
 354                 format = NULL;
 355                 continue;
 356             case FMTSW:
 357                 if (!(format = *argp++) || *format == '-')
 358                     adios (NULL, "missing argument to %s", argp[-2]);
 359                 form = NULL;
 360                 continue;
 361
 362             case WIDTHSW:
 363                 if (!(cp = *argp++) || *cp == '-')
 364                     adios (NULL, "missing argument to %s", argp[-2]);
 365                 width = atoi (cp);
 366                 continue;
 367
 368             case HOSTSW:
 369                 if (!(host = *argp++) || *host == '-')
 370                     adios (NULL, "missing argument to %s", argp[-2]);
 371                 continue;
 372
 373             case PORTSW:
 374                 if (!(host = *argp++) || *port == '-')
 375                     adios (NULL, "missing argument to %s", argp[-2]);
 376                 continue;
 377
 378             case USERSW:
 379                 if (!(user = *argp++) || *user == '-')
 380                     adios (NULL, "missing argument to %s", argp[-2]);
 381                 continue;
 382
 383             case PACKSW:
 384 #ifndef POP
 385                 if (!(cp = *argp++) || *cp == '-')
 386                     adios (NULL, "missing argument to %s", argp[-2]);
 387 #else /* POP */
 388                 if (!(packfile = *argp++) || *packfile == '-')
 389                     adios (NULL, "missing argument to %s", argp[-2]);
 390 #endif /* POP */
 391                 continue;
 392             case NPACKSW:
 393 #ifdef POP
 394                 packfile = NULL;
 395 #endif /* POP */
 396                 continue;
 397
 398             case SNOOPSW:
 399                 snoop++;
 400                 continue;
 401
 402             case SASLSW:
 403                 sasl++;
 404                 continue;
 405
 406             case SASLMECHSW:
 407                 if (!(saslmech = *argp++) || *saslmech == '-')
 408                     adios (NULL, "missing argument to %s", argp[-2]);
 409                 continue;
 410             case PROXYSW:
 411                 if (!(proxy = *argp++) || *proxy == '-')
 412                     adios (NULL, "missing argument to %s", argp[-2]);
 413                 continue;
 414             }
 415         }
 416         if (*cp == '+' || *cp == '@') {
 417             if (folder)
 418                 adios (NULL, "only one folder at a time!");
 419             else
 420                 folder = pluspath (cp);
 421         } else {
 422             adios (NULL, "usage: %s [+folder] [switches]", invo_name);
 423         }
 424     }
 425
 426     /* NOTE: above this point you should use TRYDROPGROUPPRIVS(),
 427      * not DROPGROUPPRIVS().
 428      */
 429 #ifdef POP
 430     if (host && !*host)
 431         host = NULL;
 432 #endif /* POP */
 433
 434     /* guarantee dropping group priveleges; we might not have done so earlier */
 435     DROPGROUPPRIVS();
 436
 437     /*
 438      * Where are we getting the new mail?
 439      */
 440     if (from)
 441         inc_type = INC_FILE;
 442 #ifdef POP
 443     else if (host)
 444         inc_type = INC_POP;
 445 #endif
 446     else
 447         inc_type = INC_FILE;
 448
 449 #ifdef POP
 450     /*
 451      * Are we getting the mail from
 452      * a POP server?
 453      */
 454     if (inc_type == INC_POP) {
 455         if (user == NULL)
 456             user = getusername ();
 457         if (sasl)
 458             pass = getusername ();
 459         else
 460             ruserpass (host, &user, &pass);
 461
 462         /*
 463          * initialize POP connection
 464          */
 465         if (pop_init (host, port, user, pass, proxy, snoop, sasl,
 466                       saslmech) == NOTOK)
 467             adios (NULL, "%s", response);
 468
 469         /* Check if there are any messages */
 470         if (pop_stat (&nmsgs, &nbytes) == NOTOK)
 471             adios (NULL, "%s", response);
 472
 473         if (nmsgs == 0) {
 474             pop_quit();
 475             adios (NULL, "no mail to incorporate");
 476         }
 477     }
 478 #endif /* POP */
 479
 480     /*
 481      * We will get the mail from a file
 482      * (typically the standard maildrop)
 483      */
 484
 485     if (inc_type == INC_FILE) {
 486         if (from)
 487             newmail = from;
 488         else if ((newmail = getenv ("MAILDROP")) && *newmail)
 489             newmail = m_mailpath (newmail);
 490         else if ((newmail = context_find ("maildrop")) && *newmail)
 491             newmail = m_mailpath (newmail);
 492         else {
 493             newmail = concat (MAILDIR, "/", MAILFIL, NULL);
 494         }
 495         if (stat (newmail, &s1) == NOTOK || s1.st_size == 0)
 496             adios (NULL, "no mail to incorporate");
 497         if (s1.st_mode & S_IFDIR) {
 498             DIR *md;
 499             struct dirent *de;
 500             struct stat ms;
 501             int i;
 502             i = 0;
 503             cp = concat (newmail, "/new", NULL);
 504             if ((md = opendir(cp)) == NULL)
 505                 adios (NULL, "unable to open %s", cp);
 506             while ((de = readdir (md)) != NULL) {
 507                 if (de->d_name[0] == '.')
 508                     continue;
 509                 if (i >= num_maildir_entries) {
 510                     if ((Maildir = realloc(Maildir, sizeof(*Maildir) * (2*i+16))) == NULL)
 511                         adios(NULL, "not enough memory for %d messages", 2*i+16);
 512                     num_maildir_entries = 2*i+16;
 513                 }
 514                 Maildir[i].filename = concat (cp, "/", de->d_name, NULL);
 515                 if (stat(Maildir[i].filename, &ms) != 0)
 516                    adios (Maildir[i].filename, "couldn't get delivery time");
 517                 Maildir[i].mtime = ms.st_mtime;
 518                 i++;
 519             }
 520             free (cp);
 521             closedir (md);
 522             cp = concat (newmail, "/cur", NULL);
 523             if ((md = opendir(cp)) == NULL)
 524                 adios (NULL, "unable to open %s", cp);
 525             while ((de = readdir (md)) != NULL) {
 526                 if (de->d_name[0] == '.')
 527                     continue;
 528                 if (i >= num_maildir_entries) {
 529                     if ((Maildir = realloc(Maildir, sizeof(*Maildir) * (2*i+16))) == NULL)
 530                         adios(NULL, "not enough memory for %d messages", 2*i+16);
 531                     num_maildir_entries = 2*i+16;
 532                 }
 533                 Maildir[i].filename = concat (cp, "/", de->d_name, NULL);
 534                 if (stat(Maildir[i].filename, &ms) != 0)
 535                    adios (Maildir[i].filename, "couldn't get delivery time");
 536                 Maildir[i].mtime = ms.st_mtime;
 537                 i++;
 538             }
 539             free (cp);
 540             closedir (md);
 541             if (i == 0)
 542                 adios (NULL, "no mail to incorporate");
 543             num_maildir_entries = i;
 544             qsort (Maildir, num_maildir_entries, sizeof(*Maildir), maildir_srt);
 545         }
 546
 547         if ((cp = strdup(newmail)) == (char *)0)
 548             adios (NULL, "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 && Maildir == NULL) {
 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         int i;
 617         if ((i = stat (audfile, &st)) == NOTOK)
 618             advise (NULL, "Creating Receive-Audit: %s", audfile);
 619         if ((aud = fopen (audfile, "a")) == NULL)
 620             adios (audfile, "unable to append to");
 621         else if (i == NOTOK)
 622             chmod (audfile, m_gmprot ());
 623
 624 #ifdef POP
 625         fprintf (aud, from ? "<<inc>> %s -ms %s\n"
 626                  : host ? "<<inc>> %s -host %s -user %s\n"
 627                  : "<<inc>> %s\n",
 628                  dtimenow (0), from ? from : host, user);
 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         int i;
 638         cp = concat (maildir, "/++", NULL);
 639         i = stat (cp, &st);
 640         if ((mhe = fopen (cp, "a")) == NULL)
 641             admonish (cp, "unable to append to");
 642         else
 643             if (i == NOTOK)
 644                 chmod (cp, m_gmprot ());
 645         free (cp);
 646     }
 647 #endif /* MHE */
 648
 649     /* Get new format string */
 650     nfs = new_fs (form, format, FORMAT);
 651
 652     if (noisy) {
 653         printf ("Incorporating new mail into %s...\n\n", folder);
 654         fflush (stdout);
 655     }
 656
 657 #ifdef POP
 658     /*
 659      * Get the mail from a POP server
 660      */
 661     if (inc_type == INC_POP) {
 662         int i;
 663         if (packfile) {
 664             packfile = path (packfile, TFILE);
 665             if (stat (packfile, &st) == NOTOK) {
 666                 if (errno != ENOENT)
 667                     adios (packfile, "error on file");
 668                 cp = concat ("Create file \"", packfile, "\"? ", NULL);
 669                 if (noisy && !getanswer (cp))
 670                     done (1);
 671                 free (cp);
 672             }
 673             msgnum = map_count ();
 674             if ((pd = mbx_open (packfile, mbx_style, getuid(), getgid(), m_gmprot()))
 675                 == NOTOK)
 676                 adios (packfile, "unable to open");
 677             if ((pf = fdopen (pd, "w+")) == NULL)
 678                 adios (NULL, "unable to fdopen %s", packfile);
 679         } else {
 680             hghnum = msgnum = mp->hghmsg;
 681             /*
 682              * Check if we have enough message space for all the new
 683              * messages.  If not, then realloc the folder and add enough
 684              * space for all new messages plus 10 additional slots.
 685              */
 686             if (mp->hghmsg + nmsgs >= mp->hghoff
 687                 && !(mp = folder_realloc (mp, mp->lowoff, mp->hghmsg + nmsgs + 10)))
 688                 adios (NULL, "unable to allocate folder storage");
 689         }
 690
 691         for (i = 1; i <= nmsgs; i++) {
 692             msgnum++;
 693             if (packfile) {
 694                 fseek (pf, 0L, SEEK_CUR);
 695                 pos = ftell (pf);
 696                 size = 0;
 697                 fwrite (mmdlm1, 1, strlen (mmdlm1), pf);
 698                 start = ftell (pf);
 699
 700                 if (pop_retr (i, pop_pack) == NOTOK)
 701                     adios (NULL, "%s", response);
 702
 703                 fseek (pf, 0L, SEEK_CUR);
 704                 stop = ftell (pf);
 705                 if (fflush (pf))
 706                     adios (packfile, "write error on");
 707                 fseek (pf, start, SEEK_SET);
 708             } else {
 709                 cp = getcpy (m_name (msgnum));
 710                 if ((pf = fopen (cp, "w+")) == NULL)
 711                     adios (cp, "unable to write");
 712                 chmod (cp, m_gmprot ());
 713                 start = stop = 0L;
 714
 715                 if (pop_retr (i, pop_action) == NOTOK)
 716                     adios (NULL, "%s", response);
 717
 718                 if (fflush (pf))
 719                     adios (cp, "write error on");
 720                 fseek (pf, 0L, SEEK_SET);
 721             }
 722             switch (incerr = scan (pf, msgnum, 0, nfs, width,
 723                               packfile ? 0 : msgnum == mp->hghmsg + 1 && chgflag,
 724                               1, NULL, stop - start, noisy)) {
 725             case SCNEOF:
 726                 printf ("%*d  empty\n", DMAXFOLDER, msgnum);
 727                 break;
 728
 729             case SCNFAT:
 730                 trnflag = 0;
 731                 noisy++;
 732                 /* advise (cp, "unable to read"); already advised */
 733                 /* fall thru */
 734
 735             case SCNERR:
 736             case SCNNUM:
 737                 break;
 738
 739             case SCNMSG:
 740             case SCNENC:
 741             default:
 742                 if (aud)
 743                     fputs (scanl, aud);
 744 # ifdef MHE
 745                 if (mhe)
 746                     fputs (scanl, mhe);
 747 # endif /* MHE */
 748                 if (noisy)
 749                     fflush (stdout);
 750                 if (!packfile) {
 751                     clear_msg_flags (mp, msgnum);
 752                     set_exists (mp, msgnum);
 753                     set_unseen (mp, msgnum);
 754                     mp->msgflags |= SEQMOD;
 755                 }
 756                 break;
 757             }
 758             if (packfile) {
 759                 fseek (pf, stop, SEEK_SET);
 760                 fwrite (mmdlm2, 1, strlen (mmdlm2), pf);
 761                 if (fflush (pf) || ferror (pf)) {
 762                     int e = errno;
 763                     pop_quit ();
 764                     errno = e;
 765                     adios (packfile, "write error on");
 766                 }
 767                 map_write (packfile, pd, 0, 0L, start, stop, pos, size, noisy);
 768             } else {
 769                 if (ferror(pf) || fclose (pf)) {
 770                     int e = errno;
 771                     unlink (cp);
 772                     pop_quit ();
 773                     errno = e;
 774                     adios (cp, "write error on");
 775                 }
 776                 free (cp);
 777             }
 778
 779             if (trnflag && pop_dele (i) == NOTOK)
 780                 adios (NULL, "%s", response);
 781         }
 782
 783         if (pop_quit () == NOTOK)
 784             adios (NULL, "%s", response);
 785         if (packfile) {
 786             mbx_close (packfile, pd);
 787             pd = NOTOK;
 788         }
 789     }
 790 #endif /* POP */
 791
 792     /*
 793      * Get the mail from file (usually mail spool)
 794      */
 795     if (inc_type == INC_FILE && Maildir == NULL) {
 796         m_unknown (in);         /* the MAGIC invocation... */
 797         hghnum = msgnum = mp->hghmsg;
 798         for (;;) {
 799             /*
 800              * Check if we need to allocate more space for message status.
 801              * If so, then add space for an additional 100 messages.
 802              */
 803             if (msgnum >= mp->hghoff
 804                 && !(mp = folder_realloc (mp, mp->lowoff, mp->hghoff + 100))) {
 805                 advise (NULL, "unable to allocate folder storage");
 806                 incerr = NOTOK;
 807                 break;
 808             }
 809
 810 #if 0
 811             /* copy file from spool to tmp file */
 812             tmpfilenam = m_scratch ("", invo_name);
 813             if ((fd = creat (tmpfilenam, m_gmprot ())) == NOTOK)
 814                 adios (tmpfilenam, "unable to create");
 815             chmod (tmpfilenam, m_gmprot ());
 816             if (!(in2 = fdopen (fd, "r+")))
 817                 adios (tmpfilenam, "unable to access");
 818             cpymsg (in, in2);
 819
 820             /* link message into folder */
 821             newmsg = folder_addmsg(mp, tmpfilenam);
 822 #endif
 823             /* create scanline for new message */
 824             switch (incerr = scan (in, msgnum + 1, msgnum + 1, nfs, width,
 825                               msgnum == hghnum && chgflag, 1, NULL, 0L, noisy)) {
 826             case SCNFAT:
 827             case SCNEOF:
 828                 break;
 829
 830             case SCNERR:
 831                 if (aud)
 832                     fputs ("inc aborted!\n", aud);
 833                 advise (NULL, "aborted!");      /* doesn't clean up locks! */
 834                 break;
 835
 836             case SCNNUM:
 837                 advise (NULL, "BUG in %s, number out of range", invo_name);
 838                 break;
 839
 840             default:
 841                 advise (NULL, "BUG in %s, scan() botch (%d)", invo_name, incerr);
 842                 break;
 843
 844             case SCNMSG:
 845             case SCNENC:
 846                 /*
 847                  *  Run the external program hook on the message.
 848                  */
 849
 850                 (void)snprintf(b, sizeof (b), "%s/%d", maildir_copy, msgnum + 1);
 851                 (void)ext_hook("add-hook", b, (char *)0);
 852
 853                 if (aud)
 854                     fputs (scanl, aud);
 855 #ifdef MHE
 856                 if (mhe)
 857                     fputs (scanl, mhe);
 858 #endif /* MHE */
 859                 if (noisy)
 860                     fflush (stdout);
 861
 862                 msgnum++;
 863                 mp->hghmsg++;
 864                 mp->nummsg++;
 865                 if (mp->lowmsg == 0) mp->lowmsg = 1;
 866
 867                 clear_msg_flags (mp, msgnum);
 868                 set_exists (mp, msgnum);
 869                 set_unseen (mp, msgnum);
 870                 mp->msgflags |= SEQMOD;
 871                 continue;
 872             }
 873             /* If we get here there was some sort of error from scan(),
 874              * so stop processing anything more from the spool.
 875              */
 876             break;
 877         }
 878     } else if (inc_type == INC_FILE) { /* Maildir inbox to process */
 879         char *sp;
 880         FILE *sf;
 881         int i;
 882
 883         hghnum = msgnum = mp->hghmsg;
 884         for (i = 0; i < num_maildir_entries; i++) {
 885             msgnum++;
 886             /*
 887              * Check if we need to allocate more space for message status.
 888              * If so, then add space for an additional 100 messages.
 889              */
 890             if (msgnum >= mp->hghoff
 891                 && !(mp = folder_realloc (mp, mp->lowoff, mp->hghoff + 100))) {
 892                 advise (NULL, "unable to allocate folder storage");
 893                 incerr = NOTOK;
 894                 break;
 895             }
 896
 897             sp = Maildir[i].filename;
 898             cp = getcpy (m_name (msgnum));
 899             pf = NULL;
 900             if (!trnflag || link(sp, cp) == -1) {
 901                 static char buf[65536];
 902                 size_t nrd;
 903
 904                 if ((sf = fopen (sp, "r")) == NULL)
 905                     adios (sp, "unable to read for copy");
 906                 if ((pf = fopen (cp, "w+")) == NULL)
 907                     adios (cp, "unable to write for copy");
 908                 while ((nrd = fread(buf, 1, sizeof(buf), sf)) > 0)
 909                     if (fwrite(buf, 1, nrd, pf) != nrd)
 910                         break;
 911                 if (ferror(sf) || fflush(pf) || ferror(pf)) {
 912                         int e = errno;
 913                         fclose(pf); fclose(sf); unlink(cp);
 914                         errno = e;
 915                         adios(cp, "copy error %s -> %s", sp, cp);
 916                 }
 917                 fclose (sf);
 918                 sf = NULL;
 919             }
 920             if (pf == NULL && (pf = fopen (cp, "r")) == NULL)
 921                 adios (cp, "not available");
 922             chmod (cp, m_gmprot ());
 923
 924             fseek (pf, 0L, SEEK_SET);
 925             switch (incerr = scan (pf, msgnum, 0, nfs, width,
 926                               msgnum == mp->hghmsg + 1 && chgflag,
 927                               1, NULL, stop - start, noisy)) {
 928             case SCNEOF:
 929                 printf ("%*d  empty\n", DMAXFOLDER, msgnum);
 930                 break;
 931
 932             case SCNFAT:
 933                 trnflag = 0;
 934                 noisy++;
 935                 /* advise (cp, "unable to read"); already advised */
 936                 /* fall thru */
 937
 938             case SCNERR:
 939             case SCNNUM:
 940                 break;
 941
 942             case SCNMSG:
 943             case SCNENC:
 944             default:
 945                 /*
 946                  *  Run the external program hook on the message.
 947                  */
 948
 949                 (void)snprintf(b, sizeof (b), "%s/%d", maildir_copy, msgnum + 1);
 950                 (void)ext_hook("add-hook", b, (char *)0);
 951
 952                 if (aud)
 953                     fputs (scanl, aud);
 954 # ifdef MHE
 955                 if (mhe)
 956                     fputs (scanl, mhe);
 957 # endif /* MHE */
 958                 if (noisy)
 959                     fflush (stdout);
 960                 if (!packfile) {
 961                     clear_msg_flags (mp, msgnum);
 962                     set_exists (mp, msgnum);
 963                     set_unseen (mp, msgnum);
 964                     mp->msgflags |= SEQMOD;
 965                 }
 966                 break;
 967             }
 968             if (ferror(pf) || fclose (pf)) {
 969                 int e = errno;
 970                 unlink (cp);
 971                 errno = e;
 972                 adios (cp, "write error on");
 973             }
 974             pf = NULL;
 975             free (cp);
 976
 977             if (trnflag && unlink (sp) == NOTOK)
 978                 adios (sp, "couldn't unlink");
 979             free (sp); /* Free Maildir[i]->filename */
 980         }
 981         free (Maildir); /* From now on Maildir is just a flag - don't dref! */
 982     }
 983
 984     if (incerr < 0) {           /* error */
 985         if (locked) {
 986             GETGROUPPRIVS();      /* Be sure we can unlock mail file */
 987             (void) lkfclose (in, newmail); in = NULL;
 988             DROPGROUPPRIVS();    /* And then return us to normal privileges */
 989         } else {
 990             fclose (in); in = NULL;
 991         }
 992         adios (NULL, "failed");
 993     }
 994
 995     if (aud)
 996         fclose (aud);
 997
 998 #ifdef MHE
 999     if (mhe)
1000         fclose (mhe);
1001 #endif /* MHE */
1002
1003     if (noisy)
1004         fflush (stdout);
1005
1006 #ifdef POP
1007     if ((inc_type == INC_POP) && packfile)
1008         done (0);
1009 #endif /* POP */
1010
1011     /*
1012      * truncate file we are incorporating from
1013      */
1014     if (inc_type == INC_FILE && Maildir == NULL) {
1015         if (trnflag) {
1016             if (stat (newmail, &st) != NOTOK && s1.st_mtime != st.st_mtime)
1017                 advise (NULL, "new messages have arrived!\007");
1018             else {
1019                 int newfd;
1020                 if ((newfd = creat (newmail, 0600)) != NOTOK)
1021                     close (newfd);
1022                 else
1023                     admonish (newmail, "error zero'ing");
1024                 unlink(map_name(newmail));
1025             }
1026         } else {
1027             if (noisy)
1028                 printf ("%s not zero'd\n", newmail);
1029         }
1030     }
1031
1032     if (msgnum == hghnum) {
1033         admonish (NULL, "no messages incorporated");
1034     } else {
1035         context_replace (pfolder, folder);      /* update current folder */
1036         if (chgflag)
1037             mp->curmsg = hghnum + 1;
1038         mp->hghmsg = msgnum;
1039         if (mp->lowmsg == 0)
1040             mp->lowmsg = 1;
1041         if (chgflag)            /* sigh... */
1042             seq_setcur (mp, mp->curmsg);
1043     }
1044
1045     /*
1046      * unlock the mail spool
1047      */
1048     if (inc_type == INC_FILE && Maildir == NULL) {
1049         if (locked) {
1050            GETGROUPPRIVS();        /* Be sure we can unlock mail file */
1051            (void) lkfclose (in, newmail); in = NULL;
1052            DROPGROUPPRIVS();       /* And then return us to normal privileges */
1053         } else {
1054             fclose (in); in = NULL;
1055         }
1056     }
1057
1058     seq_setunseen (mp, 0);      /* set the Unseen-Sequence */
1059     seq_save (mp);              /* synchronize sequences   */
1060     context_save ();            /* save the context file   */
1061     done (0);
1062     return 1;
1063 }
1064
1065
1066 #if 0
1067
1068 /*
1069  * Copy message message from spool into
1070  * temporary file.  Massage the "From " line
1071  * while copying.
1072  */
1073
1074 cpymsg (FILE *in, FILE *out)
1075 {
1076     int state;
1077     char *tmpbuf, name[NAMESZ];
1078
1079     for (;;) {
1080         state = m_getfld (state, name, tmpbuf, rlwidth, in);
1081         switch (state) {
1082         case FLD:
1083         case FLDPLUS:
1084             break;
1085         case BODY:
1086             break;
1087         case LENERR:
1088         case FMTERR:
1089             break;
1090         case FILEEOF:
1091             break;
1092         default:
1093         }
1094     }
1095 }
1096 #endif /* if 0 */
1097
1098
1099 static void
1100 inc_done (int status)
1101 {
1102 #ifdef POP
1103     if (packfile && pd != NOTOK)
1104         mbx_close (packfile, pd);
1105 #endif /* POP */
1106     if (locked)
1107     {
1108         GETGROUPPRIVS();
1109         lkfclose(in, newmail);
1110         DROPGROUPPRIVS();
1111     }
1112     exit (status);
1113 }
1114
1115 #ifdef POP
1116 static int
1117 pop_action (char *s)
1118 {
1119     fprintf (pf, "%s\n", s);
1120     stop += strlen (s) + 1;
1121     return 0;  /* Is return value used?  This was missing before 1999-07-15. */
1122 }
1123
1124 static int
1125 pop_pack (char *s)
1126 {
1127     int j;
1128     char buffer[BUFSIZ];
1129
1130     snprintf (buffer, sizeof(buffer), "%s\n", s);
1131     for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
1132         continue;
1133     for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
1134         continue;
1135     fputs (buffer, pf);
1136     size += strlen (buffer) + 1;
1137     return 0;  /* Is return value used?  This was missing before 1999-07-15. */
1138 }
1139
1140 static int
1141 map_count (void)
1142 {
1143     int md;
1144     char *cp;
1145     struct drop d;
1146     struct stat st;
1147
1148     if (stat (packfile, &st) == NOTOK)
1149         return 0;
1150     if ((md = open (cp = map_name (packfile), O_RDONLY)) == NOTOK
1151             || map_chk (cp, md, &d, (long) st.st_size, 1)) {
1152         if (md != NOTOK)
1153             close (md);
1154         return 0;
1155     }
1156     close (md);
1157     return (d.d_id);
1158 }
1159 #endif /* POP */