git.marmaro.de Git - mmh/blob - uip/slocal.c

   1 /*
   2 ** slocal.c -- asynchronously filter and deliver new mail
   3 **
   4 ** This code is Copyright (c) 2002, by the authors of nmh.  See the
   5 ** COPYRIGHT file in the root directory of the nmh distribution for
   6 ** complete copyright information.
   7 */
   8
   9 /*
  10 **  Under sendmail, users should add the line
  11 **
  12 **      "| /usr/local/nmh/lib/slocal"
  13 **
  14 **  to their $HOME/.forward file.
  15 **
  16 */
  17
  18 /* Changed to use getutent() and friends.  Assumes that when getutent() exists,
  19 ** a number of other things also exist.  Please check.
  20 ** Ruud de Rooij <ruud@ruud.org>  Sun, 28 May 2000 17:28:55 +0200
  21 */
  22
  23 #include <h/mh.h>
  24 #include <h/dropsbr.h>
  25 #include <h/rcvmail.h>
  26 #include <h/signals.h>
  27 #include <h/tws.h>
  28 #include <h/mts.h>
  29 #include <h/utils.h>
  30
  31 #include <pwd.h>
  32 #include <signal.h>
  33 #include <sys/ioctl.h>
  34 #include <fcntl.h>
  35
  36 #ifdef INITGROUPS_HEADER
  37 #include INITGROUPS_HEADER
  38 #else
  39 /*
  40 ** On AIX 4.1, initgroups() is defined and even documented (giving the
  41 ** parameter types as char* and int), but doesn't have a prototype in any
  42 ** of the system header files.  AIX 4.3, SunOS 4.1.3, and ULTRIX 4.2A have
  43 ** the same problem.
  44 */
  45 extern int  initgroups(char*, int);
  46 #endif
  47
  48 /*
  49 ** This define is needed for Berkeley db v2 and above to
  50 ** make the header file expose the 'historical' ndbm APIs.
  51 ** We define it unconditionally because this is simple and
  52 ** harmless.
  53 */
  54 #define DB_DBM_HSEARCH 1
  55 #ifdef NDBM_HEADER
  56 #include NDBM_HEADER
  57 #endif
  58
  59 #include <utmp.h>
  60
  61 #ifndef HAVE_GETUTENT
  62 # ifndef UTMP_FILE
  63 #  ifdef _PATH_UTMP
  64 #   define UTMP_FILE _PATH_UTMP
  65 #  else
  66 #   define UTMP_FILE "/etc/utmp"
  67 #  endif
  68 # endif
  69 #endif
  70
  71 static struct swit switches[] = {
  72 #define ADDRSW  0
  73         { "addr address", 0 },
  74 #define USERSW  1
  75         { "user name", 0 },
  76 #define FILESW  2
  77         { "file file", 0 },
  78 #define SENDERSW  3
  79         { "sender address", 0 },
  80 #define MAILBOXSW  4
  81         { "mailbox file", 0 },
  82 #define HOMESW  5
  83         { "home directory", -4 },
  84 #define INFOSW  6
  85         { "info data", 0 },
  86 #define MAILSW  7
  87         { "maildelivery file", 0 },
  88 #define VERBSW  8
  89         { "verbose", 0 },
  90 #define NVERBSW  9
  91         { "noverbose", 0 },
  92 #define SUPPRESSDUP   10
  93         { "suppressdup", 0 },
  94 #define NSUPPRESSDUP 11
  95         { "nosuppressdup", 0 },
  96 #define DEBUGSW  12
  97         { "debug", 0 },
  98 #define VERSIONSW  13
  99         { "version", 0 },
 100 #define HELPSW  14
 101         { "help", 0 },
 102         { NULL, 0 }
 103 };
 104
 105 static int globbed = 0;  /* have we built "vars" table yet? */
 106 static int parsed = 0;  /* have we built header field table yet   */
 107 static int utmped = 0;  /* have we scanned umtp(x) file yet */
 108 static int suppressdup = 0;  /* are we suppressing duplicate messages? */
 109
 110 static int verbose = 0;
 111 static int debug = 0;
 112
 113 static char *addr = NULL;
 114 static char *user = NULL;
 115 static char *info = NULL;
 116 static char *file = NULL;
 117 static char *sender = NULL;
 118 static char *envelope = NULL;  /* envelope information ("From " line)  */
 119 static char *mbox = NULL;
 120 static char *home = NULL;
 121
 122 static struct passwd *pw;  /* passwd file entry */
 123
 124 static char ddate[BUFSIZ];  /* record the delivery date */
 125 struct tws *now;
 126
 127 static jmp_buf myctx;
 128
 129 /* flags for pair->p_flags */
 130 #define P_NIL  0x00
 131 #define P_ADR  0x01  /* field is address */
 132 #define P_HID  0x02  /* special (fake) field */
 133 #define P_CHK  0x04
 134
 135 struct pair {
 136         char *p_name;
 137         char *p_value;
 138         char  p_flags;
 139 };
 140
 141 #define NVEC 100
 142
 143 /*
 144 ** Lookup table for matching fields and patterns
 145 ** in messages.  The rest of the table is added
 146 ** when the message is parsed.
 147 */
 148 static struct pair hdrs[NVEC + 1] = {
 149         { "source",  NULL, P_HID },
 150         { "addr",  NULL, P_HID },
 151         { "Return-Path",  NULL, P_ADR },
 152         { "Reply-To",  NULL, P_ADR },
 153         { "From",  NULL, P_ADR },
 154         { "Sender",  NULL, P_ADR },
 155         { "To",  NULL, P_ADR },
 156         { "cc",  NULL, P_ADR },
 157         { "Resent-Reply-To", NULL, P_ADR },
 158         { "Resent-From",  NULL, P_ADR },
 159         { "Resent-Sender",   NULL, P_ADR },
 160         { "Resent-To",  NULL, P_ADR },
 161         { "Resent-Cc",  NULL, P_ADR },
 162         { NULL, NULL, 0 }
 163 };
 164
 165 /*
 166 ** The list of builtin variables to expand in a string
 167 ** before it is executed by the "pipe" or "qpipe" action.
 168 */
 169 static struct pair vars[] = {
 170         { "sender",   NULL, P_NIL },
 171         { "address",  NULL, P_NIL },
 172         { "size",  NULL, P_NIL },
 173         { "reply-to", NULL, P_CHK },
 174         { "info",  NULL, P_NIL },
 175         { NULL, NULL, 0 }
 176 };
 177
 178 extern char **environ;
 179
 180 /*
 181 ** static prototypes
 182 */
 183 static int localmail(int, char *);
 184 static int usr_delivery(int, char *, int);
 185 static int split(char *, char **);
 186 static int parse(int);
 187 static void expand(char *, char *, int);
 188 static void glob(int);
 189 static struct pair *lookup(struct pair *, char *);
 190 static int logged_in(void);
 191 static int timely(char *, char *);
 192 static int usr_file(int, char *);
 193 static int usr_pipe(int, char *, char *, char **, int);
 194 static int usr_folder(int, char *);
 195 static RETSIGTYPE alrmser(int);
 196 static void get_sender(char *, char **);
 197 static int copy_message(int, char *, int);
 198 static void verbose_printf(char *fmt, ...);
 199 static void adorn(char *, char *, ...);
 200 static void debug_printf(char *fmt, ...);
 201 static int suppress_duplicates(int, char *);
 202 static char *trim(char *);
 203
 204
 205 int
 206 main(int argc, char **argv)
 207 {
 208         int fd, status;
 209         FILE *fp = stdin;
 210         char *cp, *mdlvr = NULL, buf[BUFSIZ];
 211         char mailbox[BUFSIZ], tmpfil[BUFSIZ];
 212         char **argp, **arguments;
 213
 214 #ifdef LOCALE
 215         setlocale(LC_ALL, "");
 216 #endif
 217         invo_name = mhbasename(*argv);
 218
 219         /* foil search of user profile/context */
 220         if (context_foil(NULL) == -1)
 221                 done(1);
 222
 223         mts_init(invo_name);
 224         arguments = getarguments(invo_name, argc, argv, 0);
 225         argp = arguments;
 226
 227         /* Parse arguments */
 228         while ((cp = *argp++)) {
 229                 if (*cp == '-') {
 230                         switch (smatch(++cp, switches)) {
 231                         case AMBIGSW:
 232                                 ambigsw(cp, switches);
 233                                 done(1);
 234                         case UNKWNSW:
 235                                 adios(NULL, "-%s unknown", cp);
 236
 237                         case HELPSW:
 238                                 snprintf(buf, sizeof(buf), "%s [switches] [address info sender]", invo_name);
 239                                 print_help(buf, switches, 0);
 240                                 done(1);
 241                         case VERSIONSW:
 242                                 print_version(invo_name);
 243                                 done(1);
 244
 245                         case ADDRSW:
 246                                 if (!(addr = *argp++))
 247                                         /* allow -xyz arguments */
 248                                         adios(NULL, "missing argument to %s",
 249                                                         argp[-2]);
 250                                 continue;
 251                         case INFOSW:
 252                                 if (!(info = *argp++))
 253                                         /* allow -xyz arguments */
 254                                         adios(NULL, "missing argument to %s",
 255                                                         argp[-2]);
 256                                 continue;
 257                         case USERSW:
 258                                 if (!(user = *argp++))
 259                                         /* allow -xyz arguments */
 260                                         adios(NULL, "missing argument to %s",
 261                                                         argp[-2]);
 262                                 continue;
 263                         case FILESW:
 264                                 if (!(file = *argp++) || *file == '-')
 265                                         adios(NULL, "missing argument to %s",
 266                                                         argp[-2]);
 267                                 continue;
 268                         case SENDERSW:
 269                                 if (!(sender = *argp++))
 270                                         /* allow -xyz arguments */
 271                                         adios(NULL, "missing argument to %s",
 272                                                         argp[-2]);
 273                                 continue;
 274                         case MAILBOXSW:
 275                                 if (!(mbox = *argp++) || *mbox == '-')
 276                                         adios(NULL, "missing argument to %s",
 277                                                         argp[-2]);
 278                                 continue;
 279                         case HOMESW:
 280                                 if (!(home = *argp++) || *home == '-')
 281                                         adios(NULL, "missing argument to %s",
 282                                                         argp[-2]);
 283                                 continue;
 284
 285                         case MAILSW:
 286                                 if (!(cp = *argp++) || *cp == '-')
 287                                         adios(NULL, "missing argument to %s",
 288                                                         argp[-2]);
 289                                 if (mdlvr)
 290                                         adios(NULL, "only one maildelivery file at a time!");
 291                                 mdlvr = cp;
 292                                 continue;
 293
 294                         case VERBSW:
 295                                 verbose++;
 296                                 continue;
 297                         case NVERBSW:
 298                                 verbose = 0;
 299                                 continue;
 300
 301                         case SUPPRESSDUP:
 302                                 suppressdup++;
 303                                 continue;
 304                         case NSUPPRESSDUP:
 305                                 suppressdup = 0;
 306                                 continue;
 307                         case DEBUGSW:
 308                                 debug++;
 309                                 continue;
 310                         }
 311                 }
 312
 313                 switch (argp - (argv + 1)) {
 314                 case 1:
 315                         addr = cp;
 316                         break;
 317                 case 2:
 318                         info = cp;
 319                         break;
 320                 case 3:
 321                         sender = cp;
 322                         break;
 323                 }
 324         }
 325
 326         if (addr == NULL)
 327                 addr = getusername();
 328         if (user == NULL)
 329                 user = (cp = strchr(addr, '.')) ? ++cp : addr;
 330         if ((pw = getpwnam(user)) == NULL)
 331                 adios(NULL, "no such local user as %s", user);
 332
 333         if (chdir(pw->pw_dir) == -1)
 334                 chdir("/");
 335         umask(0077);
 336
 337         if (geteuid() == 0) {
 338                 setgid(pw->pw_gid);
 339                 initgroups(pw->pw_name, pw->pw_gid);
 340                 setuid(pw->pw_uid);
 341         }
 342
 343         if (info == NULL)
 344                 info = "";
 345
 346         setbuf(stdin, NULL);
 347
 348         /* Record the delivery time */
 349         if ((now = dlocaltimenow()) == NULL)
 350                 adios(NULL, "unable to ascertain local time");
 351         snprintf(ddate, sizeof(ddate), "Delivery-Date: %s\n", dtimenow(0));
 352
 353         /*
 354         ** Copy the message to a temporary file
 355         */
 356         if (file) {
 357                 int tempfd;
 358
 359                 /* getting message from file */
 360                 if ((tempfd = open(file, O_RDONLY)) == -1)
 361                         adios(file, "unable to open");
 362                 if (debug)
 363                         debug_printf("retrieving message from file \"%s\"\n",
 364                                         file);
 365                 if ((fd = copy_message(tempfd, tmpfil, 1)) == -1)
 366                         adios(NULL, "unable to create temporary file");
 367                 close(tempfd);
 368         } else {
 369                 /* getting message from stdin */
 370                 if (debug)
 371                         debug_printf("retrieving message from stdin\n");
 372                 if ((fd = copy_message(fileno(stdin), tmpfil, 1)) == -1)
 373                         adios(NULL, "unable to create temporary file");
 374         }
 375
 376         if (debug)
 377                 debug_printf("temporary file=\"%s\"\n", tmpfil);
 378
 379         /*
 380         ** Delete the temp file now or a copy of every single message
 381         ** passed through slocal will be left in the /tmp directory until
 382         ** deleted manually!  This unlink() used to be under an 'else'
 383         ** of the 'if (debug)' above, but since some people like to
 384         ** always run slocal with -debug and log the results, the /tmp
 385         ** directory would get choked over time.  Of course, now that
 386         ** we always delete the temp file, the "temporary file=" message
 387         ** above is somewhat pointless -- someone watching debug output
 388         ** wouldn't have a chance to 'tail -f' or 'ln' the temp file
 389         ** before it's unlinked.  The best thing would be to delay this
 390         ** unlink() until later if debug == 1, but I'll leave that for
 391         ** someone who cares about the temp-file-accessing functionality
 392         ** (they'll have to watch out for cases where we adios()).
 393         */
 394         unlink(tmpfil);
 395
 396         if (!(fp = fdopen(fd, "r+")))
 397                 adios(NULL, "unable to access temporary file");
 398
 399         /*
 400         ** If no sender given, extract it
 401         ** from envelope information.
 402         */
 403         if (sender == NULL)
 404                 get_sender(envelope, &sender);
 405
 406         if (mbox == NULL) {
 407                 snprintf(mailbox, sizeof(mailbox), "%s/%s",
 408                                 mailspool, pw->pw_name);
 409                 mbox = mailbox;
 410         }
 411         if (home == NULL)
 412                 home = pw->pw_dir;
 413
 414         if (debug) {
 415                 debug_printf("addr=\"%s\"\n", trim(addr));
 416                 debug_printf("user=\"%s\"\n", trim(user));
 417                 debug_printf("info=\"%s\"\n", trim(info));
 418                 debug_printf("sender=\"%s\"\n", trim(sender));
 419                 debug_printf("envelope=\"%s\"\n",
 420                                 envelope ? trim(envelope) : "");
 421                 debug_printf("mbox=\"%s\"\n", trim(mbox));
 422                 debug_printf("home=\"%s\"\n", trim(home));
 423                 debug_printf("ddate=\"%s\"\n", trim(ddate));
 424                 debug_printf("now=%02d:%02d\n\n", now->tw_hour, now->tw_min);
 425         }
 426
 427         /* deliver the message */
 428         status = localmail(fd, mdlvr);
 429
 430         done(status != -1 ? RCV_MOK : RCV_MBX);
 431         return 1;
 432 }
 433
 434
 435 /*
 436 ** Main routine for delivering message.
 437 */
 438
 439 static int
 440 localmail(int fd, char *mdlvr)
 441 {
 442         /* check if this message is a duplicate */
 443         if (suppressdup && suppress_duplicates(fd, mdlvr ?
 444                         mdlvr : ".maildelivery") == DONE)
 445                 return 0;
 446
 447         /* delivery according to personal Maildelivery file */
 448         if (usr_delivery(fd, mdlvr ? mdlvr : ".maildelivery", 0) != -1)
 449                 return 0;
 450
 451         /* delivery according to global Maildelivery file */
 452         if (usr_delivery(fd, maildelivery, 1) != -1)
 453                 return 0;
 454
 455         if (verbose)
 456                 verbose_printf("(delivering to standard mail spool)\n");
 457
 458         /* last resort - deliver to standard mail spool */
 459         return usr_file(fd, mbox);
 460 }
 461
 462
 463 #define matches(a,b) (stringdex(b, a) >= 0)
 464
 465 /*
 466 ** Parse the delivery file, and process incoming message.
 467 */
 468
 469 static int
 470 usr_delivery(int fd, char *delivery, int su)
 471 {
 472         int i, accept, status=1, won, vecp, next;
 473         char *field, *pattern, *action, *result, *string;
 474         char buffer[BUFSIZ], tmpbuf[BUFSIZ];
 475         char *cp, *vec[NVEC];
 476         struct stat st;
 477         struct pair *p;
 478         FILE *fp;
 479
 480         /* open the delivery file */
 481         if ((fp = fopen(delivery, "r")) == NULL)
 482                 return -1;
 483
 484         /* check if delivery file has bad ownership or permissions */
 485         if (fstat(fileno(fp), &st) == -1 ||
 486                         (st.st_uid != 0 && (su || st.st_uid != pw->pw_uid)) ||
 487                         st.st_mode & (S_IWGRP|S_IWOTH)) {
 488                 if (verbose) {
 489                         verbose_printf("WARNING: %s has bad ownership/modes (su=%d,uid=%d,owner=%d,mode=0%o)\n", delivery, su, (int) pw->pw_uid, (int) st.st_uid, (int) st.st_mode);
 490                 }
 491                 return -1;
 492         }
 493
 494         won = 0;
 495         next = 1;
 496
 497         /* read and process delivery file */
 498         while (fgets(buffer, sizeof(buffer), fp)) {
 499                 /* skip comments and empty lines */
 500                 if (*buffer == '#' || *buffer == '\n')
 501                         continue;
 502
 503                 /* zap trailing newline */
 504                 if ((cp = strchr(buffer, '\n')))
 505                         *cp = 0;
 506
 507                 /* split buffer into fields */
 508                 vecp = split(buffer, vec);
 509
 510                 /* check for too few fields */
 511                 if (vecp < 5) {
 512                         if (debug)
 513                                 debug_printf("WARNING: entry with only %d fields, skipping.\n", vecp);
 514                         continue;
 515                 }
 516
 517                 if (debug) {
 518                         for (i = 0; vec[i]; i++)
 519                                 debug_printf("vec[%d]: \"%s\"\n",
 520                                                 i, trim(vec[i]));
 521                 }
 522
 523                 field   = vec[0];
 524                 pattern = vec[1];
 525                 action  = vec[2];
 526                 result  = vec[3];
 527                 string  = vec[4];
 528
 529                 /* find out how to perform the action */
 530                 switch (result[0]) {
 531                 case 'N':
 532                 case 'n':
 533                         /*
 534                         ** If previous condition failed, don't
 535                         ** do this - else fall through
 536                         */
 537                          if (!next)
 538                                 continue;  /* else fall */
 539
 540                 case '?':
 541                         /*
 542                         ** If already delivered, skip this action.
 543                         ** Else consider delivered if action is
 544                         ** successful.
 545                         */
 546                         if (won)
 547                                 continue;  /* else fall */
 548
 549                 case 'A':
 550                 case 'a':
 551                         /*
 552                         ** Take action, and consider delivered if
 553                         ** action is successful.
 554                         */
 555                         accept = 1;
 556                         break;
 557
 558                 case 'R':
 559                 case 'r':
 560                 default:
 561                         /*
 562                         ** Take action, but don't consider delivered,
 563                         ** even if action is successful
 564                         */
 565                         accept = 0;
 566                         break;
 567                 }
 568
 569                 if (vecp > 5) {
 570                         if (!mh_strcasecmp(vec[5], "select")) {
 571                                 if (logged_in() != -1)
 572                                         continue;
 573                                 if (vecp > 7 && timely(vec[6], vec[7]) == -1)
 574                                         continue;
 575                         }
 576                 }
 577
 578                 /* check if the field matches */
 579                 switch (*field) {
 580                 case '*':
 581                 /* always matches */
 582                         break;
 583
 584                 case 'd':
 585                 /*
 586                 ** "default" matches only if the message hasn't
 587                 ** been delivered yet.
 588                 */
 589                         if (!mh_strcasecmp(field, "default")) {
 590                                 if (won)
 591                                         continue;
 592                                 break;
 593                         }  /* else fall */
 594
 595                 default:
 596                         /* parse message and build lookup table */
 597                         if (!parsed && parse(fd) == -1) {
 598                                 fclose(fp);
 599                                 return -1;
 600                         }
 601                         /*
 602                         ** find header field in lookup table, and
 603                         ** see if the pattern matches.
 604                         */
 605                         if ((p = lookup(hdrs, field)) && (p->p_value != NULL)
 606                                         && matches(p->p_value, pattern)) {
 607                                 next = 1;
 608                         } else {
 609                                 next = 0;
 610                                 continue;
 611                         }
 612                         break;
 613                 }
 614
 615                 /* find out the action to perform */
 616                 switch (*action) {
 617                 case 'q':
 618                         /* deliver to quoted pipe */
 619                         if (mh_strcasecmp(action, "qpipe"))
 620                                 continue;  /* else fall */
 621                 case '^':
 622                         expand(tmpbuf, string, fd);
 623                         if (split(tmpbuf, vec) < 1)
 624                                 continue;
 625                         status = usr_pipe(fd, tmpbuf, vec[0], vec, 0);
 626                         break;
 627
 628                 case 'p':
 629                         /* deliver to pipe */
 630                         if (mh_strcasecmp(action, "pipe"))
 631                                 continue;  /* else fall */
 632                 case '|':
 633                         vec[2] = "sh";
 634                         vec[3] = "-c";
 635                         expand(tmpbuf, string, fd);
 636                         vec[4] = tmpbuf;
 637                         vec[5] = NULL;
 638                         status = usr_pipe(fd, tmpbuf, "/bin/sh",
 639                                         vec + 2, 0);
 640                         break;
 641
 642                 case 'f':
 643                         /* mbox format */
 644                         if (!mh_strcasecmp(action, "file")) {
 645                                 status = usr_file(fd, string);
 646                                 break;
 647                         }
 648                         /* deliver to nmh folder */
 649                         else if (mh_strcasecmp(action, "folder"))
 650                                 continue;  /* else fall */
 651                 case '+':
 652                         status = usr_folder(fd, string);
 653                         break;
 654
 655                 case 'm':
 656                         /* mbox format */
 657                         if (mh_strcasecmp(action, "mbox"))
 658                                 continue;  /* else fall */
 659
 660                 case '>':
 661                         /* mbox format */
 662                         status = usr_file(fd, string);
 663                         break;
 664
 665                 case 'd':
 666                         /* ignore message */
 667                         if (mh_strcasecmp(action, "destroy"))
 668                                 continue;
 669                         status = 0;
 670                         break;
 671                 }
 672
 673                 if (status)
 674                         next = 0;  /* action failed, mark for 'N' result */
 675
 676                 if (accept && status == 0)
 677                         won++;
 678         }
 679
 680         fclose(fp);
 681         return (won ? 0 : -1);
 682 }
 683
 684
 685 #define QUOTE  '\\'
 686
 687 /*
 688 ** Split buffer into fields (delimited by whitespace or
 689 ** comma's).  Return the number of fields found.
 690 */
 691
 692 static int
 693 split(char *cp, char **vec)
 694 {
 695         int i;
 696         unsigned char *s;
 697
 698         s = cp;
 699
 700         /* split into a maximum of NVEC fields */
 701         for (i = 0; i <= NVEC;) {
 702                 vec[i] = NULL;
 703
 704                 /* zap any whitespace and comma's */
 705                 while (isspace(*s) || *s == ',')
 706                         *s++ = 0;
 707
 708                 /* end of buffer, time to leave */
 709                 if (*s == 0)
 710                         break;
 711
 712                 /* get double quote text as a single field */
 713                 if (*s == '"') {
 714                         for (vec[i++] = ++s; *s && *s != '"'; s++) {
 715                                 /*
 716                                 ** Check for escaped double quote.  We need
 717                                 ** to shift the string to remove slash.
 718                                 */
 719                                 if (*s == QUOTE) {
 720                                         if (*++s == '"')
 721                                                 strcpy(s - 1, s);
 722                                         s--;
 723                                 }
 724                         }
 725                         if (*s == '"')  /* zap trailing double quote */
 726                                 *s++ = 0;
 727                         continue;
 728                 }
 729
 730                 if (*s == QUOTE && *++s != '"')
 731                         s--;
 732                 vec[i++] = s++;
 733
 734                 /* move forward to next field delimiter */
 735                 while (*s && !isspace(*s) && *s != ',')
 736                         s++;
 737         }
 738         vec[i] = NULL;
 739
 740         return i;
 741 }
 742
 743
 744 /*
 745 ** Parse the headers of a message, and build the
 746 ** lookup table for matching fields and patterns.
 747 */
 748
 749 static int
 750 parse(int fd)
 751 {
 752         int i, state;
 753         int fd1;
 754         char *cp, *dp, *lp;
 755         char name[NAMESZ], field[BUFSIZ];
 756         struct pair *p, *q;
 757         FILE  *in;
 758
 759         if (parsed++)
 760                 return 0;
 761
 762         /* get a new FILE pointer to message */
 763         if ((fd1 = dup(fd)) == -1)
 764                 return -1;
 765         if ((in = fdopen(fd1, "r")) == NULL) {
 766                 close(fd1);
 767                 return -1;
 768         }
 769         rewind(in);
 770
 771         /* add special entries to lookup table */
 772         if ((p = lookup(hdrs, "source")))
 773                 p->p_value = getcpy(sender);
 774         if ((p = lookup(hdrs, "addr")))
 775                 p->p_value = getcpy(addr);
 776
 777         /*
 778          * Scan the headers of the message and build
 779          * a lookup table.
 780          */
 781         for (i = 0, state = FLD;;) {
 782                 switch (state = m_getfld(state, name, field, sizeof(field),
 783                                 in)) {
 784                 case FLD:
 785                 case FLDEOF:
 786                 case FLDPLUS:
 787                         lp = getcpy(field);
 788                         while (state == FLDPLUS) {
 789                                 state = m_getfld(state, name, field,
 790                                                 sizeof(field), in);
 791                                 lp = add(field, lp);
 792                         }
 793                         for (p = hdrs; p->p_name; p++) {
 794                                 if (!mh_strcasecmp(p->p_name, name)) {
 795                                         if (!(p->p_flags & P_HID)) {
 796                                                 if ((cp = p->p_value)) {
 797                                                         if (p->p_flags & P_ADR) {
 798                                                                 dp = cp + strlen(cp) - 1;
 799                                                                 if (*dp == '\n')
 800                                                                         *dp = 0;
 801                                                                 cp = add(",\n\t", cp);
 802                                                         } else {
 803                                                                 cp = add("\t", cp);
 804                                                         }
 805                                                 }
 806                                                 p->p_value = add(lp, cp);
 807                                         }
 808                                         free(lp);
 809                                         break;
 810                                 }
 811                         }
 812                         if (p->p_name == NULL && i < NVEC) {
 813                                 p->p_name = getcpy(name);
 814                                 p->p_value = lp;
 815                                 p->p_flags = P_NIL;
 816                                 p++, i++;
 817                                 p->p_name = NULL;
 818                         }
 819                         if (state != FLDEOF)
 820                                 continue;
 821                         break;
 822
 823                 case BODY:
 824                 case BODYEOF:
 825                 case FILEEOF:
 826                         break;
 827
 828                 case LENERR:
 829                 case FMTERR:
 830                         advise(NULL, "format error in message");
 831                         break;
 832
 833                 default:
 834                         advise(NULL, "internal error in m_getfld");
 835                         fclose(in);
 836                         return -1;
 837                 }
 838                 break;
 839         }
 840         fclose(in);
 841
 842         if ((p = lookup(vars, "reply-to"))) {
 843                 if ((q = lookup(hdrs, "reply-to")) == NULL ||
 844                                 q->p_value == NULL)
 845                         q = lookup(hdrs, "from");
 846                 p->p_value = getcpy(q ? q->p_value : "");
 847                 p->p_flags &= ~P_CHK;
 848                 if (debug)
 849                         debug_printf("vars[%d]: name=\"%s\" value=\"%s\"\n",
 850                                         p - vars, p->p_name, trim(p->p_value));
 851         }
 852         if (debug) {
 853                 for (p = hdrs; p->p_name; p++)
 854                         debug_printf("hdrs[%d]: name=\"%s\" value=\"%s\"\n",
 855                                 p - hdrs, p->p_name,
 856                                 p->p_value ? trim(p->p_value) : "");
 857         }
 858
 859         return 0;
 860 }
 861
 862
 863 #define LPAREN '('
 864 #define RPAREN ')'
 865
 866 /*
 867 ** Expand any builtin variables such as $(sender),
 868 ** $(address), etc., in a string.
 869 */
 870
 871 static void
 872 expand(char *s1, char *s2, int fd)
 873 {
 874         char c, *cp;
 875         struct pair *p;
 876
 877         if (!globbed)
 878                 glob(fd);
 879
 880         while ((c = *s2++)) {
 881                 if (c != '$' || *s2 != LPAREN) {
 882                         *s1++ = c;
 883                 } else {
 884                         for (cp = ++s2; *s2 && *s2 != RPAREN; s2++)
 885                                 continue;
 886                         if (*s2 != RPAREN) {
 887                                 s2 = --cp;
 888                                 continue;
 889                         }
 890                         *s2++ = 0;
 891                         if ((p = lookup(vars, cp))) {
 892                                 if (!parsed && (p->p_flags & P_CHK))
 893                                         parse(fd);
 894
 895                                 strcpy(s1, p->p_value);
 896                                 s1 += strlen(s1);
 897                         }
 898                 }
 899         }
 900         *s1 = 0;
 901 }
 902
 903
 904 /*
 905 ** Fill in the information missing from the "vars"
 906 ** table, which is necessary to expand any builtin
 907 ** variables in the string for a "pipe" or "qpipe"
 908 ** action.
 909 */
 910
 911 static void
 912 glob(int fd)
 913 {
 914         char buffer[BUFSIZ];
 915         struct stat st;
 916         struct pair *p;
 917
 918         if (globbed++)
 919                 return;
 920
 921         if ((p = lookup(vars, "sender")))
 922                 p->p_value = getcpy(sender);
 923         if ((p = lookup(vars, "address")))
 924                 p->p_value = getcpy(addr);
 925         if ((p = lookup(vars, "size"))) {
 926                 snprintf(buffer, sizeof(buffer), "%d",
 927                                 fstat(fd, &st) != -1 ? (int) st.st_size : 0);
 928                 p->p_value = getcpy(buffer);
 929         }
 930         if ((p = lookup(vars, "info")))
 931                 p->p_value = getcpy(info);
 932
 933         if (debug) {
 934                 for (p = vars; p->p_name; p++)
 935                         debug_printf("vars[%d]: name=\"%s\" value=\"%s\"\n",
 936                                         p - vars, p->p_name, trim(p->p_value));
 937         }
 938 }
 939
 940
 941 /*
 942 ** Find a matching name in a lookup table.  If found,
 943 ** return the "pairs" entry, else return NULL.
 944 */
 945
 946 static struct pair *
 947 lookup(struct pair *pairs, char *key)
 948 {
 949         for (; pairs->p_name; pairs++)
 950                 if (!mh_strcasecmp(pairs->p_name, key))
 951                         return pairs;
 952
 953         return NULL;
 954 }
 955
 956
 957 /*
 958 ** Check utmp(x) file to see if user is currently
 959 ** logged in.
 960 */
 961
 962 #ifdef HAVE_GETUTENT
 963 static int
 964 logged_in(void)
 965 {
 966         struct utmp * utp;
 967
 968         if (utmped)
 969                 return utmped;
 970
 971         setutent();
 972
 973         while ((utp = getutent()) != NULL) {
 974                 if (
 975 #ifdef HAVE_STRUCT_UTMP_UT_TYPE
 976                                 utp->ut_type == USER_PROCESS &&
 977 #endif
 978                                 utp->ut_name[0] != 0 &&
 979                                 strncmp(user, utp->ut_name,
 980                                 sizeof(utp->ut_name)) == 0) {
 981                         if (debug)
 982                                 continue;
 983                         endutent();
 984                         return (utmped = DONE);
 985                 }
 986         }
 987
 988         endutent();
 989         return (utmped = NOTOK);
 990 }
 991 #else
 992 static int
 993 logged_in(void)
 994 {
 995         struct utmp ut;
 996         FILE *uf;
 997
 998         if (utmped)
 999                 return utmped;
1000
1001         if ((uf = fopen(UTMP_FILE, "r")) == NULL)
1002                 return NOTOK;
1003
1004         while (fread((char *) &ut, sizeof(ut), 1, uf) == 1) {
1005                 if (ut.ut_name[0] != 0 &&
1006                                 strncmp(user, ut.ut_name, sizeof(ut.ut_name))
1007                                 == 0) {
1008                         if (debug)
1009                                 continue;
1010                         fclose(uf);
1011                         return (utmped = DONE);
1012                 }
1013         }
1014
1015         fclose(uf);
1016         return (utmped = NOTOK);
1017 }
1018 #endif
1019
1020 #define check(t,a,b)  if (t < a || t > b) return -1
1021 #define cmpar(h1,m1,h2,m2)  if (h1 < h2 || (h1 == h2 && m1 < m2)) return 0
1022
1023 static int
1024 timely(char *t1, char *t2)
1025 {
1026         int t1hours, t1mins, t2hours, t2mins;
1027
1028         if (sscanf(t1, "%d:%d", &t1hours, &t1mins) != 2)
1029                 return -1;
1030         check(t1hours, 0, 23);
1031         check(t1mins, 0, 59);
1032
1033         if (sscanf(t2, "%d:%d", &t2hours, &t2mins) != 2)
1034                 return -1;
1035         check(t2hours, 0, 23);
1036         check(t2mins, 0, 59);
1037
1038         cmpar(now->tw_hour, now->tw_min, t1hours, t1mins);
1039         cmpar(t2hours, t2mins, now->tw_hour, now->tw_min);
1040
1041         return -1;
1042 }
1043
1044
1045 /*
1046 ** Deliver message by appending to a file.
1047 */
1048
1049 static int
1050 usr_file(int fd, char *mailbox)
1051 {
1052         int md;
1053
1054         if (verbose)
1055                 verbose_printf("delivering to file \"%s\"", mailbox);
1056
1057         if (verbose)
1058                 verbose_printf(" (mbox style)");
1059
1060         /* open and lock the file */
1061         if ((md = mbx_open(mailbox, pw->pw_uid, pw->pw_gid,
1062                         m_gmprot())) == -1) {
1063                 if (verbose)
1064                         adorn("", "unable to open:");
1065                 return -1;
1066         }
1067
1068         lseek(fd, (off_t) 0, SEEK_SET);
1069
1070         /* append message to file */
1071         if (mbx_copy(mailbox, md, fd, verbose) == -1) {
1072                 if (verbose)
1073                         adorn("", "error writing to:");
1074                 return -1;
1075         }
1076
1077         /* close and unlock file */
1078         if (mbx_close(mailbox, md) == NOTOK) {
1079                 if (verbose)
1080                         adorn("", "error closing:");
1081                 return -1;
1082         }
1083
1084         if (verbose)
1085                 verbose_printf(", success.\n");
1086         return 0;
1087 }
1088
1089
1090 /*
1091 ** Deliver message to a nmh folder.
1092 */
1093
1094 static int
1095 usr_folder(int fd, char *string)
1096 {
1097         int status;
1098         char folder[BUFSIZ], *vec[3];
1099
1100         /* get folder name ready */
1101         if (*string == '+')
1102                 strncpy(folder, string, sizeof(folder));
1103         else
1104                 snprintf(folder, sizeof(folder), "+%s", string);
1105
1106         if (verbose)
1107                 verbose_printf("delivering to folder \"%s\"", folder + 1);
1108
1109         vec[0] = "rcvstore";
1110         vec[1] = folder;
1111         vec[2] = NULL;
1112
1113         /* use rcvstore to put message in folder */
1114         status = usr_pipe(fd, "rcvstore", rcvstoreproc, vec, 1);
1115
1116 #if 0
1117         /*
1118         ** Currently, verbose status messages are handled by usr_pipe().
1119         */
1120         if (verbose) {
1121                 if (status == 0)
1122                         verbose_printf(", success.\n");
1123                 else
1124                         verbose_printf(", failed.\n");
1125         }
1126 #endif
1127
1128         return status;
1129 }
1130
1131 /*
1132 ** Deliver message to a process.
1133 */
1134
1135 static int
1136 usr_pipe(int fd, char *cmd, char *pgm, char **vec, int suppress)
1137 {
1138         pid_t child_id;
1139         int i, bytes, seconds, status;
1140         struct stat st;
1141
1142         if (verbose && !suppress)
1143                 verbose_printf("delivering to pipe \"%s\"", cmd);
1144
1145         lseek(fd, (off_t) 0, SEEK_SET);
1146
1147         for (i = 0; (child_id = fork()) == -1 && i < 5; i++)
1148                 sleep(5);
1149
1150         switch (child_id) {
1151         case -1:
1152                 /* fork error */
1153                 if (verbose)
1154                         adorn("fork", "unable to");
1155                 return -1;
1156
1157         case 0:
1158                 /* child process */
1159                 if (fd != 0)
1160                         dup2(fd, 0);
1161                 freopen("/dev/null", "w", stdout);
1162                 freopen("/dev/null", "w", stderr);
1163                 if (fd != 3)
1164                         dup2(fd, 3);
1165                 closefds(4);
1166
1167 #ifdef TIOCNOTTY
1168                 if ((fd = open("/dev/tty", O_RDWR)) != -1) {
1169                         ioctl(fd, TIOCNOTTY, NULL);
1170                         close(fd);
1171                 }
1172 #endif /* TIOCNOTTY */
1173
1174                 /* put in own process group */
1175                 setpgid((pid_t) 0, getpid());
1176
1177                 *environ = NULL;
1178                 m_putenv("USER", pw->pw_name);
1179                 m_putenv("HOME", pw->pw_dir);
1180                 m_putenv("SHELL", pw->pw_shell);
1181
1182                 execvp(pgm, vec);
1183                 _exit(-1);
1184
1185         default:
1186                 /* parent process */
1187                 if (!setjmp(myctx)) {
1188                         SIGNAL(SIGALRM, alrmser);
1189                         bytes = fstat(fd, &st) != -1 ?
1190                                         (int) st.st_size : 100;
1191
1192                         /*
1193                         ** amount of time to wait depends on
1194                         ** message size
1195                         */
1196                         if (bytes <= 100) {
1197                                 /* give at least 5 minutes */
1198                                 seconds = 300;
1199                         } else if (bytes >= 90000) {
1200                                 /* a half hour is long enough */
1201                                 seconds = 1800;
1202                         } else {
1203                                 seconds = (bytes / 60) + 300;
1204                         }
1205                         alarm((unsigned int) seconds);
1206                         status = pidwait(child_id, 0);
1207                         alarm(0);
1208
1209                         if (verbose) {
1210                                 if (status == 0)
1211                                         verbose_printf(", success.\n");
1212                                 else
1213                                         if ((status & 0xff00) == 0xff00)
1214                                                 verbose_printf(", system error\n");
1215                                         else
1216                                                 pidstatus(status, stdout, ", failed");
1217                         }
1218                         return (status == 0 ? 0 : -1);
1219                 } else {
1220                         /*
1221                         ** Ruthlessly kill the child and anything
1222                         ** else in its process group.
1223                         */
1224                         KILLPG(child_id, SIGKILL);
1225                         if (verbose)
1226                                 verbose_printf(", timed-out; terminated\n");
1227                         return -1;
1228                 }
1229         }
1230 }
1231
1232
1233 static RETSIGTYPE
1234 alrmser(int i)
1235 {
1236 #ifndef RELIABLE_SIGNALS
1237         SIGNAL(SIGALRM, alrmser);
1238 #endif
1239
1240         longjmp(myctx, DONE);
1241 }
1242
1243
1244 /*
1245 ** Get the `sender' from the envelope
1246 ** information ("From " line).
1247 */
1248
1249 static void
1250 get_sender(char *envelope, char **sender)
1251 {
1252         int i;
1253         unsigned char *cp;
1254         unsigned char buffer[BUFSIZ];
1255
1256         if (envelope == NULL) {
1257                 *sender = getcpy("");
1258                 return;
1259         }
1260
1261         i = strlen("From ");
1262         strncpy(buffer, envelope + i, sizeof(buffer));
1263         if ((cp = strchr(buffer, '\n'))) {
1264                 *cp = 0;
1265                 cp -= 24;
1266                 if (cp < buffer)
1267                         cp = buffer;
1268         } else {
1269                 cp = buffer;
1270         }
1271         *cp = 0;
1272
1273         for (cp = buffer + strlen(buffer) - 1; cp >= buffer; cp--)
1274                 if (isspace(*cp))
1275                         *cp = 0;
1276                 else
1277                         break;
1278         *sender = getcpy(buffer);
1279 }
1280
1281
1282 /*
1283 ** Copy message into a temporary file.
1284 ** While copying, it will do some header processing
1285 ** including the extraction of the envelope information.
1286 */
1287
1288 static int
1289 copy_message(int qd, char *tmpfil, int fold)
1290 {
1291         int i, first = 1, fd1, fd2;
1292         char buffer[BUFSIZ];
1293         FILE *qfp, *ffp;
1294         char *tfile = NULL;
1295
1296         tfile = m_mktemp2(NULL, invo_name, &fd1, NULL);
1297         if (tfile == NULL) return -1;
1298         fchmod(fd1, 0600);
1299         strncpy(tmpfil, tfile, BUFSIZ);
1300
1301         if (!fold) {
1302                 while ((i = read(qd, buffer, sizeof(buffer))) > 0)
1303                         if (write(fd1, buffer, i) != i) {
1304 you_lose:
1305                                 close(fd1);
1306                                 unlink(tmpfil);
1307                                 return -1;
1308                         }
1309                 if (i == -1)
1310                         goto you_lose;
1311                 lseek(fd1, (off_t) 0, SEEK_SET);
1312                 return fd1;
1313         }
1314
1315         /* dup the fd for incoming message */
1316         if ((fd2 = dup(qd)) == -1) {
1317                 close(fd1);
1318                 return -1;
1319         }
1320
1321         /* now create a FILE pointer for it */
1322         if ((qfp = fdopen(fd2, "r")) == NULL) {
1323                 close(fd1);
1324                 close(fd2);
1325                 return -1;
1326         }
1327
1328         /* dup the fd for temporary file */
1329         if ((fd2 = dup(fd1)) == -1) {
1330                 close(fd1);
1331                 fclose(qfp);
1332                 return -1;
1333         }
1334
1335         /* now create a FILE pointer for it */
1336         if ((ffp = fdopen(fd2, "r+")) == NULL) {
1337                 close(fd1);
1338                 close(fd2);
1339                 fclose(qfp);
1340                 return -1;
1341         }
1342
1343         /*
1344         ** copy message into temporary file
1345         ** and massage the headers.  Save
1346         ** a copy of the "From " line for later.
1347         */
1348         i = strlen("From ");
1349         while (fgets(buffer, sizeof(buffer), qfp)) {
1350                 if (first) {
1351                         first = 0;
1352                         if (strncmp(buffer, "From ", i)==0) {
1353 #ifdef RPATHS
1354                                 char *fp, *cp, *hp, *ep;
1355 #endif
1356                                 /*
1357                                 ** get copy of envelope information
1358                                 ** ("From " line)
1359                                 */
1360                                 envelope = getcpy(buffer);
1361
1362 #if 0
1363                                 /*
1364                                 ** First go ahead and put "From " line
1365                                 ** in message
1366                                 */
1367                                 fputs(buffer, ffp);
1368                                 if (ferror(ffp))
1369                                         goto fputs_error;
1370 #endif
1371
1372 #ifdef RPATHS
1373                                 /*
1374                                 ** Now create a "Return-Path:" line
1375                                 ** from the "From " line.
1376                                 */
1377                                 hp = cp = strchr(fp = envelope + i, ' ');
1378                                 while ((hp = strchr(++hp, 'r')))
1379                                         if (uprf(hp, "remote from")) {
1380                                                 hp = strrchr(hp, ' ');
1381                                                 break;
1382                                         }
1383                                 if (hp) {
1384                                         /*
1385                                         ** return path for UUCP style
1386                                         ** addressing
1387                                         */
1388                                         ep = strchr(++hp, '\n');
1389                                         snprintf(buffer, sizeof(buffer), "Return-Path: %.*s!%.*s\n", (int)(ep - hp), hp, (int)(cp - fp), fp);
1390                                 } else {
1391                                         /*
1392                                         ** return path for standard domain
1393                                         ** addressing
1394                                         */
1395                                         snprintf(buffer, sizeof(buffer), "Return-Path: %.*s\n", (int)(cp - fp), fp);
1396                                 }
1397
1398                                 /* Add Return-Path header to message */
1399                                 fputs(buffer, ffp);
1400                                 if (ferror(ffp))
1401                                         goto fputs_error;
1402 #endif
1403                                 /* Put the delivery date in message */
1404                                 fputs(ddate, ffp);
1405                                 if (ferror(ffp))
1406                                         goto fputs_error;
1407
1408                                 continue;
1409                         }
1410                 }
1411
1412                 fputs(buffer, ffp);
1413                 if (ferror(ffp))
1414                         goto fputs_error;
1415         }
1416
1417         fclose(ffp);
1418         if (ferror(qfp)) {
1419                 close(fd1);
1420                 fclose(qfp);
1421                 return -1;
1422         }
1423         fclose(qfp);
1424         lseek(fd1, (off_t) 0, SEEK_SET);
1425         return fd1;
1426
1427
1428 fputs_error:
1429         close(fd1);
1430         fclose(ffp);
1431         fclose(qfp);
1432         return -1;
1433 }
1434
1435 /*
1436 ** Trim strings for pretty printing of debugging output
1437 */
1438
1439 static char *
1440 trim(char *cp)
1441 {
1442         char buffer[BUFSIZ*4];
1443         unsigned char *bp, *sp;
1444
1445         if (cp == NULL)
1446                 return NULL;
1447
1448         /* copy string into temp buffer */
1449         strncpy(buffer, cp, sizeof(buffer));
1450         bp = buffer;
1451
1452         /* skip over leading whitespace */
1453         while (isspace(*bp))
1454                 bp++;
1455
1456         /* start at the end and zap trailing whitespace */
1457         for (sp = bp + strlen(bp) - 1; sp >= bp; sp--) {
1458                 if (isspace(*sp))
1459                         *sp = 0;
1460                 else
1461                         break;
1462         }
1463
1464         /* replace remaining whitespace with spaces */
1465         for (sp = bp; *sp; sp++)
1466                 if (isspace(*sp))
1467                         *sp = ' ';
1468
1469         /* now return a copy */
1470         return getcpy(bp);
1471 }
1472
1473 /*
1474 ** Function for printing `verbose' messages.
1475 */
1476
1477 static void
1478 verbose_printf(char *fmt, ...)
1479 {
1480         va_list ap;
1481
1482         va_start(ap, fmt);
1483         vfprintf(stdout, fmt, ap);
1484         va_end(ap);
1485
1486         fflush(stdout);  /* now flush output */
1487 }
1488
1489
1490 /*
1491 ** Function for printing `verbose' delivery
1492 ** error messages.
1493 */
1494
1495 static void
1496 adorn(char *what, char *fmt, ...)
1497 {
1498         va_list ap;
1499         int eindex;
1500         char *s;
1501
1502         eindex = errno;  /* save the errno */
1503         fprintf(stdout, ", ");
1504
1505         va_start(ap, fmt);
1506         vfprintf(stdout, fmt, ap);
1507         va_end(ap);
1508
1509         if (what) {
1510                 if (*what)
1511                         fprintf(stdout, " %s: ", what);
1512                 if ((s = strerror(eindex)))
1513                         fprintf(stdout, "%s", s);
1514                 else
1515                         fprintf(stdout, "Error %d", eindex);
1516         }
1517
1518         fputc('\n', stdout);
1519         fflush(stdout);
1520 }
1521
1522
1523 /*
1524 ** Function for printing `debug' messages.
1525 */
1526
1527 static void
1528 debug_printf(char *fmt, ...)
1529 {
1530         va_list ap;
1531
1532         va_start(ap, fmt);
1533         vfprintf(stderr, fmt, ap);
1534         va_end(ap);
1535 }
1536
1537
1538 /*
1539 ** Check ndbm/db file(s) to see if the Message-Id of this
1540 ** message matches the Message-Id of a previous message,
1541 ** so we can discard it.  If it doesn't match, we add the
1542 ** Message-Id of this message to the ndbm/db file.
1543 */
1544 static int
1545 suppress_duplicates(int fd, char *file)
1546 {
1547         int fd1, lockfd, state, result;
1548         char *cp, buf[BUFSIZ], name[NAMESZ];
1549         datum key, value;
1550         DBM *db;
1551         FILE *in;
1552
1553         if ((fd1 = dup(fd)) == -1)
1554                 return -1;
1555         if (!(in = fdopen(fd1, "r"))) {
1556                 close(fd1);
1557                 return -1;
1558         }
1559         rewind(in);
1560
1561         for (state = FLD;;) {
1562                 state = m_getfld(state, name, buf, sizeof(buf), in);
1563                 switch (state) {
1564                 case FLD:
1565                 case FLDPLUS:
1566                 case FLDEOF:
1567                         /* Search for the message ID */
1568                         if (mh_strcasecmp(name, "Message-ID")) {
1569                                 while (state == FLDPLUS)
1570                                         state = m_getfld(state, name, buf,
1571                                                         sizeof(buf), in);
1572                                 continue;
1573                         }
1574
1575                         cp = getcpy(buf);
1576                         while (state == FLDPLUS) {
1577                                 state = m_getfld(state, name, buf,
1578                                                 sizeof(buf), in);
1579                                 cp = add(buf, cp);
1580                         }
1581                         key.dptr = trimcpy(cp);
1582                         key.dsize = strlen(key.dptr) + 1;
1583                         free(cp);
1584                         cp = key.dptr;
1585
1586                         if (!(db = dbm_open(file, O_RDWR | O_CREAT, 0600))) {
1587                                 advise(file, "unable to perform dbm_open on");
1588                                 free(cp);
1589                                 fclose(in);
1590                                 return -1;
1591                         }
1592                         /*
1593                         ** Since it is difficult to portable lock a ndbm
1594                         ** file, we will open and lock the Maildelivery
1595                         ** file instead.  This will fail if your Maildelivery
1596                         ** file doesn't exist.
1597                         */
1598                         if ((lockfd = lkopen(file, O_RDWR, 0)) == -1) {
1599                                 advise(file, "unable to perform file locking on");
1600                                 free(cp);
1601                                 fclose(in);
1602                                 return -1;
1603                         }
1604                         value = dbm_fetch(db, key);
1605                         if (value.dptr) {
1606                                 if (verbose)
1607                                         verbose_printf("Message-ID: %s\n            already received on %s", cp, value.dptr);
1608                                 result = DONE;
1609                         } else {
1610                                 value.dptr  = ddate + sizeof("Delivery-Date:");
1611                                 value.dsize = strlen(value.dptr) + 1;
1612                                 if (dbm_store(db, key, value, DBM_INSERT))
1613                                         advise(file, "possibly corrupt file");
1614                                 result = 0;
1615                         }
1616
1617                         dbm_close(db);
1618                         lkclose(lockfd, file);
1619                         free(cp);
1620                         fclose(in);
1621                         return result;
1622                         break;
1623
1624                 case BODY:
1625                 case BODYEOF:
1626                 case FILEEOF:
1627                         break;
1628
1629                 case LENERR:
1630                 case FMTERR:
1631                 default:
1632                         break;
1633                 }
1634
1635                 break;
1636         }
1637
1638         fclose(in);
1639         return 0;
1640 }