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                                 mmdfldir[0] ? mmdfldir : pw->pw_dir,
 409                                 mmdflfil[0] ? mmdflfil : pw->pw_name);
 410                 mbox = mailbox;
 411         }
 412         if (home == NULL)
 413                 home = pw->pw_dir;
 414
 415         if (debug) {
 416                 debug_printf("addr=\"%s\"\n", trim(addr));
 417                 debug_printf("user=\"%s\"\n", trim(user));
 418                 debug_printf("info=\"%s\"\n", trim(info));
 419                 debug_printf("sender=\"%s\"\n", trim(sender));
 420                 debug_printf("envelope=\"%s\"\n",
 421                                 envelope ? trim(envelope) : "");
 422                 debug_printf("mbox=\"%s\"\n", trim(mbox));
 423                 debug_printf("home=\"%s\"\n", trim(home));
 424                 debug_printf("ddate=\"%s\"\n", trim(ddate));
 425                 debug_printf("now=%02d:%02d\n\n", now->tw_hour, now->tw_min);
 426         }
 427
 428         /* deliver the message */
 429         status = localmail(fd, mdlvr);
 430
 431         done(status != -1 ? RCV_MOK : RCV_MBX);
 432         return 1;
 433 }
 434
 435
 436 /*
 437 ** Main routine for delivering message.
 438 */
 439
 440 static int
 441 localmail(int fd, char *mdlvr)
 442 {
 443         /* check if this message is a duplicate */
 444         if (suppressdup && suppress_duplicates(fd, mdlvr ?
 445                         mdlvr : ".maildelivery") == DONE)
 446                 return 0;
 447
 448         /* delivery according to personal Maildelivery file */
 449         if (usr_delivery(fd, mdlvr ? mdlvr : ".maildelivery", 0) != -1)
 450                 return 0;
 451
 452         /* delivery according to global Maildelivery file */
 453         if (usr_delivery(fd, maildelivery, 1) != -1)
 454                 return 0;
 455
 456         if (verbose)
 457                 verbose_printf("(delivering to standard mail spool)\n");
 458
 459         /* last resort - deliver to standard mail spool */
 460         return usr_file(fd, mbox);
 461 }
 462
 463
 464 #define matches(a,b) (stringdex(b, a) >= 0)
 465
 466 /*
 467 ** Parse the delivery file, and process incoming message.
 468 */
 469
 470 static int
 471 usr_delivery(int fd, char *delivery, int su)
 472 {
 473         int i, accept, status=1, won, vecp, next;
 474         char *field, *pattern, *action, *result, *string;
 475         char buffer[BUFSIZ], tmpbuf[BUFSIZ];
 476         char *cp, *vec[NVEC];
 477         struct stat st;
 478         struct pair *p;
 479         FILE *fp;
 480
 481         /* open the delivery file */
 482         if ((fp = fopen(delivery, "r")) == NULL)
 483                 return -1;
 484
 485         /* check if delivery file has bad ownership or permissions */
 486         if (fstat(fileno(fp), &st) == -1 ||
 487                         (st.st_uid != 0 && (su || st.st_uid != pw->pw_uid)) ||
 488                         st.st_mode & (S_IWGRP|S_IWOTH)) {
 489                 if (verbose) {
 490                         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);
 491                 }
 492                 return -1;
 493         }
 494
 495         won = 0;
 496         next = 1;
 497
 498         /* read and process delivery file */
 499         while (fgets(buffer, sizeof(buffer), fp)) {
 500                 /* skip comments and empty lines */
 501                 if (*buffer == '#' || *buffer == '\n')
 502                         continue;
 503
 504                 /* zap trailing newline */
 505                 if ((cp = strchr(buffer, '\n')))
 506                         *cp = 0;
 507
 508                 /* split buffer into fields */
 509                 vecp = split(buffer, vec);
 510
 511                 /* check for too few fields */
 512                 if (vecp < 5) {
 513                         if (debug)
 514                                 debug_printf("WARNING: entry with only %d fields, skipping.\n", vecp);
 515                         continue;
 516                 }
 517
 518                 if (debug) {
 519                         for (i = 0; vec[i]; i++)
 520                                 debug_printf("vec[%d]: \"%s\"\n",
 521                                                 i, trim(vec[i]));
 522                 }
 523
 524                 field   = vec[0];
 525                 pattern = vec[1];
 526                 action  = vec[2];
 527                 result  = vec[3];
 528                 string  = vec[4];
 529
 530                 /* find out how to perform the action */
 531                 switch (result[0]) {
 532                 case 'N':
 533                 case 'n':
 534                         /*
 535                         ** If previous condition failed, don't
 536                         ** do this - else fall through
 537                         */
 538                          if (!next)
 539                                 continue;  /* else fall */
 540
 541                 case '?':
 542                         /*
 543                         ** If already delivered, skip this action.
 544                         ** Else consider delivered if action is
 545                         ** successful.
 546                         */
 547                         if (won)
 548                                 continue;  /* else fall */
 549
 550                 case 'A':
 551                 case 'a':
 552                         /*
 553                         ** Take action, and consider delivered if
 554                         ** action is successful.
 555                         */
 556                         accept = 1;
 557                         break;
 558
 559                 case 'R':
 560                 case 'r':
 561                 default:
 562                         /*
 563                         ** Take action, but don't consider delivered,
 564                         ** even if action is successful
 565                         */
 566                         accept = 0;
 567                         break;
 568                 }
 569
 570                 if (vecp > 5) {
 571                         if (!mh_strcasecmp(vec[5], "select")) {
 572                                 if (logged_in() != -1)
 573                                         continue;
 574                                 if (vecp > 7 && timely(vec[6], vec[7]) == -1)
 575                                         continue;
 576                         }
 577                 }
 578
 579                 /* check if the field matches */
 580                 switch (*field) {
 581                 case '*':
 582                 /* always matches */
 583                         break;
 584
 585                 case 'd':
 586                 /*
 587                 ** "default" matches only if the message hasn't
 588                 ** been delivered yet.
 589                 */
 590                         if (!mh_strcasecmp(field, "default")) {
 591                                 if (won)
 592                                         continue;
 593                                 break;
 594                         }  /* else fall */
 595
 596                 default:
 597                         /* parse message and build lookup table */
 598                         if (!parsed && parse(fd) == -1) {
 599                                 fclose(fp);
 600                                 return -1;
 601                         }
 602                         /*
 603                         ** find header field in lookup table, and
 604                         ** see if the pattern matches.
 605                         */
 606                         if ((p = lookup(hdrs, field)) && (p->p_value != NULL)
 607                                         && matches(p->p_value, pattern)) {
 608                                 next = 1;
 609                         } else {
 610                                 next = 0;
 611                                 continue;
 612                         }
 613                         break;
 614                 }
 615
 616                 /* find out the action to perform */
 617                 switch (*action) {
 618                 case 'q':
 619                         /* deliver to quoted pipe */
 620                         if (mh_strcasecmp(action, "qpipe"))
 621                                 continue;  /* else fall */
 622                 case '^':
 623                         expand(tmpbuf, string, fd);
 624                         if (split(tmpbuf, vec) < 1)
 625                                 continue;
 626                         status = usr_pipe(fd, tmpbuf, vec[0], vec, 0);
 627                         break;
 628
 629                 case 'p':
 630                         /* deliver to pipe */
 631                         if (mh_strcasecmp(action, "pipe"))
 632                                 continue;  /* else fall */
 633                 case '|':
 634                         vec[2] = "sh";
 635                         vec[3] = "-c";
 636                         expand(tmpbuf, string, fd);
 637                         vec[4] = tmpbuf;
 638                         vec[5] = NULL;
 639                         status = usr_pipe(fd, tmpbuf, "/bin/sh",
 640                                         vec + 2, 0);
 641                         break;
 642
 643                 case 'f':
 644                         /* mbox format */
 645                         if (!mh_strcasecmp(action, "file")) {
 646                                 status = usr_file(fd, string);
 647                                 break;
 648                         }
 649                         /* deliver to nmh folder */
 650                         else if (mh_strcasecmp(action, "folder"))
 651                                 continue;  /* else fall */
 652                 case '+':
 653                         status = usr_folder(fd, string);
 654                         break;
 655
 656                 case 'm':
 657                         /* mbox format */
 658                         if (mh_strcasecmp(action, "mbox"))
 659                                 continue;  /* else fall */
 660
 661                 case '>':
 662                         /* mbox format */
 663                         status = usr_file(fd, string);
 664                         break;
 665
 666                 case 'd':
 667                         /* ignore message */
 668                         if (mh_strcasecmp(action, "destroy"))
 669                                 continue;
 670                         status = 0;
 671                         break;
 672                 }
 673
 674                 if (status)
 675                         next = 0;  /* action failed, mark for 'N' result */
 676
 677                 if (accept && status == 0)
 678                         won++;
 679         }
 680
 681         fclose(fp);
 682         return (won ? 0 : -1);
 683 }
 684
 685
 686 #define QUOTE  '\\'
 687
 688 /*
 689 ** Split buffer into fields (delimited by whitespace or
 690 ** comma's).  Return the number of fields found.
 691 */
 692
 693 static int
 694 split(char *cp, char **vec)
 695 {
 696         int i;
 697         unsigned char *s;
 698
 699         s = cp;
 700
 701         /* split into a maximum of NVEC fields */
 702         for (i = 0; i <= NVEC;) {
 703                 vec[i] = NULL;
 704
 705                 /* zap any whitespace and comma's */
 706                 while (isspace(*s) || *s == ',')
 707                         *s++ = 0;
 708
 709                 /* end of buffer, time to leave */
 710                 if (*s == 0)
 711                         break;
 712
 713                 /* get double quote text as a single field */
 714                 if (*s == '"') {
 715                         for (vec[i++] = ++s; *s && *s != '"'; s++) {
 716                                 /*
 717                                 ** Check for escaped double quote.  We need
 718                                 ** to shift the string to remove slash.
 719                                 */
 720                                 if (*s == QUOTE) {
 721                                         if (*++s == '"')
 722                                                 strcpy(s - 1, s);
 723                                         s--;
 724                                 }
 725                         }
 726                         if (*s == '"')  /* zap trailing double quote */
 727                                 *s++ = 0;
 728                         continue;
 729                 }
 730
 731                 if (*s == QUOTE && *++s != '"')
 732                         s--;
 733                 vec[i++] = s++;
 734
 735                 /* move forward to next field delimiter */
 736                 while (*s && !isspace(*s) && *s != ',')
 737                         s++;
 738         }
 739         vec[i] = NULL;
 740
 741         return i;
 742 }
 743
 744
 745 /*
 746 ** Parse the headers of a message, and build the
 747 ** lookup table for matching fields and patterns.
 748 */
 749
 750 static int
 751 parse(int fd)
 752 {
 753         int i, state;
 754         int fd1;
 755         char *cp, *dp, *lp;
 756         char name[NAMESZ], field[BUFSIZ];
 757         struct pair *p, *q;
 758         FILE  *in;
 759
 760         if (parsed++)
 761                 return 0;
 762
 763         /* get a new FILE pointer to message */
 764         if ((fd1 = dup(fd)) == -1)
 765                 return -1;
 766         if ((in = fdopen(fd1, "r")) == NULL) {
 767                 close(fd1);
 768                 return -1;
 769         }
 770         rewind(in);
 771
 772         /* add special entries to lookup table */
 773         if ((p = lookup(hdrs, "source")))
 774                 p->p_value = getcpy(sender);
 775         if ((p = lookup(hdrs, "addr")))
 776                 p->p_value = getcpy(addr);
 777
 778         /*
 779          * Scan the headers of the message and build
 780          * a lookup table.
 781          */
 782         for (i = 0, state = FLD;;) {
 783                 switch (state = m_getfld(state, name, field, sizeof(field),
 784                                 in)) {
 785                 case FLD:
 786                 case FLDEOF:
 787                 case FLDPLUS:
 788                         lp = getcpy(field);
 789                         while (state == FLDPLUS) {
 790                                 state = m_getfld(state, name, field,
 791                                                 sizeof(field), in);
 792                                 lp = add(field, lp);
 793                         }
 794                         for (p = hdrs; p->p_name; p++) {
 795                                 if (!mh_strcasecmp(p->p_name, name)) {
 796                                         if (!(p->p_flags & P_HID)) {
 797                                                 if ((cp = p->p_value)) {
 798                                                         if (p->p_flags & P_ADR) {
 799                                                                 dp = cp + strlen(cp) - 1;
 800                                                                 if (*dp == '\n')
 801                                                                         *dp = 0;
 802                                                                 cp = add(",\n\t", cp);
 803                                                         } else {
 804                                                                 cp = add("\t", cp);
 805                                                         }
 806                                                 }
 807                                                 p->p_value = add(lp, cp);
 808                                         }
 809                                         free(lp);
 810                                         break;
 811                                 }
 812                         }
 813                         if (p->p_name == NULL && i < NVEC) {
 814                                 p->p_name = getcpy(name);
 815                                 p->p_value = lp;
 816                                 p->p_flags = P_NIL;
 817                                 p++, i++;
 818                                 p->p_name = NULL;
 819                         }
 820                         if (state != FLDEOF)
 821                                 continue;
 822                         break;
 823
 824                 case BODY:
 825                 case BODYEOF:
 826                 case FILEEOF:
 827                         break;
 828
 829                 case LENERR:
 830                 case FMTERR:
 831                         advise(NULL, "format error in message");
 832                         break;
 833
 834                 default:
 835                         advise(NULL, "internal error in m_getfld");
 836                         fclose(in);
 837                         return -1;
 838                 }
 839                 break;
 840         }
 841         fclose(in);
 842
 843         if ((p = lookup(vars, "reply-to"))) {
 844                 if ((q = lookup(hdrs, "reply-to")) == NULL ||
 845                                 q->p_value == NULL)
 846                         q = lookup(hdrs, "from");
 847                 p->p_value = getcpy(q ? q->p_value : "");
 848                 p->p_flags &= ~P_CHK;
 849                 if (debug)
 850                         debug_printf("vars[%d]: name=\"%s\" value=\"%s\"\n",
 851                                         p - vars, p->p_name, trim(p->p_value));
 852         }
 853         if (debug) {
 854                 for (p = hdrs; p->p_name; p++)
 855                         debug_printf("hdrs[%d]: name=\"%s\" value=\"%s\"\n",
 856                                 p - hdrs, p->p_name,
 857                                 p->p_value ? trim(p->p_value) : "");
 858         }
 859
 860         return 0;
 861 }
 862
 863
 864 #define LPAREN '('
 865 #define RPAREN ')'
 866
 867 /*
 868 ** Expand any builtin variables such as $(sender),
 869 ** $(address), etc., in a string.
 870 */
 871
 872 static void
 873 expand(char *s1, char *s2, int fd)
 874 {
 875         char c, *cp;
 876         struct pair *p;
 877
 878         if (!globbed)
 879                 glob(fd);
 880
 881         while ((c = *s2++)) {
 882                 if (c != '$' || *s2 != LPAREN) {
 883                         *s1++ = c;
 884                 } else {
 885                         for (cp = ++s2; *s2 && *s2 != RPAREN; s2++)
 886                                 continue;
 887                         if (*s2 != RPAREN) {
 888                                 s2 = --cp;
 889                                 continue;
 890                         }
 891                         *s2++ = 0;
 892                         if ((p = lookup(vars, cp))) {
 893                                 if (!parsed && (p->p_flags & P_CHK))
 894                                         parse(fd);
 895
 896                                 strcpy(s1, p->p_value);
 897                                 s1 += strlen(s1);
 898                         }
 899                 }
 900         }
 901         *s1 = 0;
 902 }
 903
 904
 905 /*
 906 ** Fill in the information missing from the "vars"
 907 ** table, which is necessary to expand any builtin
 908 ** variables in the string for a "pipe" or "qpipe"
 909 ** action.
 910 */
 911
 912 static void
 913 glob(int fd)
 914 {
 915         char buffer[BUFSIZ];
 916         struct stat st;
 917         struct pair *p;
 918
 919         if (globbed++)
 920                 return;
 921
 922         if ((p = lookup(vars, "sender")))
 923                 p->p_value = getcpy(sender);
 924         if ((p = lookup(vars, "address")))
 925                 p->p_value = getcpy(addr);
 926         if ((p = lookup(vars, "size"))) {
 927                 snprintf(buffer, sizeof(buffer), "%d",
 928                                 fstat(fd, &st) != -1 ? (int) st.st_size : 0);
 929                 p->p_value = getcpy(buffer);
 930         }
 931         if ((p = lookup(vars, "info")))
 932                 p->p_value = getcpy(info);
 933
 934         if (debug) {
 935                 for (p = vars; p->p_name; p++)
 936                         debug_printf("vars[%d]: name=\"%s\" value=\"%s\"\n",
 937                                         p - vars, p->p_name, trim(p->p_value));
 938         }
 939 }
 940
 941
 942 /*
 943 ** Find a matching name in a lookup table.  If found,
 944 ** return the "pairs" entry, else return NULL.
 945 */
 946
 947 static struct pair *
 948 lookup(struct pair *pairs, char *key)
 949 {
 950         for (; pairs->p_name; pairs++)
 951                 if (!mh_strcasecmp(pairs->p_name, key))
 952                         return pairs;
 953
 954         return NULL;
 955 }
 956
 957
 958 /*
 959 ** Check utmp(x) file to see if user is currently
 960 ** logged in.
 961 */
 962
 963 #ifdef HAVE_GETUTENT
 964 static int
 965 logged_in(void)
 966 {
 967         struct utmp * utp;
 968
 969         if (utmped)
 970                 return utmped;
 971
 972         setutent();
 973
 974         while ((utp = getutent()) != NULL) {
 975                 if (
 976 #ifdef HAVE_STRUCT_UTMP_UT_TYPE
 977                                 utp->ut_type == USER_PROCESS &&
 978 #endif
 979                                 utp->ut_name[0] != 0 &&
 980                                 strncmp(user, utp->ut_name,
 981                                 sizeof(utp->ut_name)) == 0) {
 982                         if (debug)
 983                                 continue;
 984                         endutent();
 985                         return (utmped = DONE);
 986                 }
 987         }
 988
 989         endutent();
 990         return (utmped = NOTOK);
 991 }
 992 #else
 993 static int
 994 logged_in(void)
 995 {
 996         struct utmp ut;
 997         FILE *uf;
 998
 999         if (utmped)
1000                 return utmped;
1001
1002         if ((uf = fopen(UTMP_FILE, "r")) == NULL)
1003                 return NOTOK;
1004
1005         while (fread((char *) &ut, sizeof(ut), 1, uf) == 1) {
1006                 if (ut.ut_name[0] != 0 &&
1007                                 strncmp(user, ut.ut_name, sizeof(ut.ut_name))
1008                                 == 0) {
1009                         if (debug)
1010                                 continue;
1011                         fclose(uf);
1012                         return (utmped = DONE);
1013                 }
1014         }
1015
1016         fclose(uf);
1017         return (utmped = NOTOK);
1018 }
1019 #endif
1020
1021 #define check(t,a,b)  if (t < a || t > b) return -1
1022 #define cmpar(h1,m1,h2,m2)  if (h1 < h2 || (h1 == h2 && m1 < m2)) return 0
1023
1024 static int
1025 timely(char *t1, char *t2)
1026 {
1027         int t1hours, t1mins, t2hours, t2mins;
1028
1029         if (sscanf(t1, "%d:%d", &t1hours, &t1mins) != 2)
1030                 return -1;
1031         check(t1hours, 0, 23);
1032         check(t1mins, 0, 59);
1033
1034         if (sscanf(t2, "%d:%d", &t2hours, &t2mins) != 2)
1035                 return -1;
1036         check(t2hours, 0, 23);
1037         check(t2mins, 0, 59);
1038
1039         cmpar(now->tw_hour, now->tw_min, t1hours, t1mins);
1040         cmpar(t2hours, t2mins, now->tw_hour, now->tw_min);
1041
1042         return -1;
1043 }
1044
1045
1046 /*
1047 ** Deliver message by appending to a file.
1048 */
1049
1050 static int
1051 usr_file(int fd, char *mailbox)
1052 {
1053         int md;
1054
1055         if (verbose)
1056                 verbose_printf("delivering to file \"%s\"", mailbox);
1057
1058         if (verbose)
1059                 verbose_printf(" (mbox style)");
1060
1061         /* open and lock the file */
1062         if ((md = mbx_open(mailbox, pw->pw_uid, pw->pw_gid,
1063                         m_gmprot())) == -1) {
1064                 if (verbose)
1065                         adorn("", "unable to open:");
1066                 return -1;
1067         }
1068
1069         lseek(fd, (off_t) 0, SEEK_SET);
1070
1071         /* append message to file */
1072         if (mbx_copy(mailbox, md, fd, NULL, verbose)
1073                         == -1) {
1074                 if (verbose)
1075                         adorn("", "error writing to:");
1076                 return -1;
1077         }
1078
1079         /* close and unlock file */
1080         if (mbx_close(mailbox, md) == NOTOK) {
1081                 if (verbose)
1082                         adorn("", "error closing:");
1083                 return -1;
1084         }
1085
1086         if (verbose)
1087                 verbose_printf(", success.\n");
1088         return 0;
1089 }
1090
1091
1092 /*
1093 ** Deliver message to a nmh folder.
1094 */
1095
1096 static int
1097 usr_folder(int fd, char *string)
1098 {
1099         int status;
1100         char folder[BUFSIZ], *vec[3];
1101
1102         /* get folder name ready */
1103         if (*string == '+')
1104                 strncpy(folder, string, sizeof(folder));
1105         else
1106                 snprintf(folder, sizeof(folder), "+%s", string);
1107
1108         if (verbose)
1109                 verbose_printf("delivering to folder \"%s\"", folder + 1);
1110
1111         vec[0] = "rcvstore";
1112         vec[1] = folder;
1113         vec[2] = NULL;
1114
1115         /* use rcvstore to put message in folder */
1116         status = usr_pipe(fd, "rcvstore", rcvstoreproc, vec, 1);
1117
1118 #if 0
1119         /*
1120         ** Currently, verbose status messages are handled by usr_pipe().
1121         */
1122         if (verbose) {
1123                 if (status == 0)
1124                         verbose_printf(", success.\n");
1125                 else
1126                         verbose_printf(", failed.\n");
1127         }
1128 #endif
1129
1130         return status;
1131 }
1132
1133 /*
1134 ** Deliver message to a process.
1135 */
1136
1137 static int
1138 usr_pipe(int fd, char *cmd, char *pgm, char **vec, int suppress)
1139 {
1140         pid_t child_id;
1141         int i, bytes, seconds, status;
1142         struct stat st;
1143
1144         if (verbose && !suppress)
1145                 verbose_printf("delivering to pipe \"%s\"", cmd);
1146
1147         lseek(fd, (off_t) 0, SEEK_SET);
1148
1149         for (i = 0; (child_id = fork()) == -1 && i < 5; i++)
1150                 sleep(5);
1151
1152         switch (child_id) {
1153         case -1:
1154                 /* fork error */
1155                 if (verbose)
1156                         adorn("fork", "unable to");
1157                 return -1;
1158
1159         case 0:
1160                 /* child process */
1161                 if (fd != 0)
1162                         dup2(fd, 0);
1163                 freopen("/dev/null", "w", stdout);
1164                 freopen("/dev/null", "w", stderr);
1165                 if (fd != 3)
1166                         dup2(fd, 3);
1167                 closefds(4);
1168
1169 #ifdef TIOCNOTTY
1170                 if ((fd = open("/dev/tty", O_RDWR)) != -1) {
1171                         ioctl(fd, TIOCNOTTY, NULL);
1172                         close(fd);
1173                 }
1174 #endif /* TIOCNOTTY */
1175
1176                 /* put in own process group */
1177                 setpgid((pid_t) 0, getpid());
1178
1179                 *environ = NULL;
1180                 m_putenv("USER", pw->pw_name);
1181                 m_putenv("HOME", pw->pw_dir);
1182                 m_putenv("SHELL", pw->pw_shell);
1183
1184                 execvp(pgm, vec);
1185                 _exit(-1);
1186
1187         default:
1188                 /* parent process */
1189                 if (!setjmp(myctx)) {
1190                         SIGNAL(SIGALRM, alrmser);
1191                         bytes = fstat(fd, &st) != -1 ?
1192                                         (int) st.st_size : 100;
1193
1194                         /*
1195                         ** amount of time to wait depends on
1196                         ** message size
1197                         */
1198                         if (bytes <= 100) {
1199                                 /* give at least 5 minutes */
1200                                 seconds = 300;
1201                         } else if (bytes >= 90000) {
1202                                 /* a half hour is long enough */
1203                                 seconds = 1800;
1204                         } else {
1205                                 seconds = (bytes / 60) + 300;
1206                         }
1207                         alarm((unsigned int) seconds);
1208                         status = pidwait(child_id, 0);
1209                         alarm(0);
1210
1211                         if (verbose) {
1212                                 if (status == 0)
1213                                         verbose_printf(", success.\n");
1214                                 else
1215                                         if ((status & 0xff00) == 0xff00)
1216                                                 verbose_printf(", system error\n");
1217                                         else
1218                                                 pidstatus(status, stdout, ", failed");
1219                         }
1220                         return (status == 0 ? 0 : -1);
1221                 } else {
1222                         /*
1223                         ** Ruthlessly kill the child and anything
1224                         ** else in its process group.
1225                         */
1226                         KILLPG(child_id, SIGKILL);
1227                         if (verbose)
1228                                 verbose_printf(", timed-out; terminated\n");
1229                         return -1;
1230                 }
1231         }
1232 }
1233
1234
1235 static RETSIGTYPE
1236 alrmser(int i)
1237 {
1238 #ifndef RELIABLE_SIGNALS
1239         SIGNAL(SIGALRM, alrmser);
1240 #endif
1241
1242         longjmp(myctx, DONE);
1243 }
1244
1245
1246 /*
1247 ** Get the `sender' from the envelope
1248 ** information ("From " line).
1249 */
1250
1251 static void
1252 get_sender(char *envelope, char **sender)
1253 {
1254         int i;
1255         unsigned char *cp;
1256         unsigned char buffer[BUFSIZ];
1257
1258         if (envelope == NULL) {
1259                 *sender = getcpy("");
1260                 return;
1261         }
1262
1263         i = strlen("From ");
1264         strncpy(buffer, envelope + i, sizeof(buffer));
1265         if ((cp = strchr(buffer, '\n'))) {
1266                 *cp = 0;
1267                 cp -= 24;
1268                 if (cp < buffer)
1269                         cp = buffer;
1270         } else {
1271                 cp = buffer;
1272         }
1273         *cp = 0;
1274
1275         for (cp = buffer + strlen(buffer) - 1; cp >= buffer; cp--)
1276                 if (isspace(*cp))
1277                         *cp = 0;
1278                 else
1279                         break;
1280         *sender = getcpy(buffer);
1281 }
1282
1283
1284 /*
1285 ** Copy message into a temporary file.
1286 ** While copying, it will do some header processing
1287 ** including the extraction of the envelope information.
1288 */
1289
1290 static int
1291 copy_message(int qd, char *tmpfil, int fold)
1292 {
1293         int i, first = 1, fd1, fd2;
1294         char buffer[BUFSIZ];
1295         FILE *qfp, *ffp;
1296         char *tfile = NULL;
1297
1298         tfile = m_mktemp2(NULL, invo_name, &fd1, NULL);
1299         if (tfile == NULL) return -1;
1300         fchmod(fd1, 0600);
1301         strncpy(tmpfil, tfile, BUFSIZ);
1302
1303         if (!fold) {
1304                 while ((i = read(qd, buffer, sizeof(buffer))) > 0)
1305                         if (write(fd1, buffer, i) != i) {
1306 you_lose:
1307                                 close(fd1);
1308                                 unlink(tmpfil);
1309                                 return -1;
1310                         }
1311                 if (i == -1)
1312                         goto you_lose;
1313                 lseek(fd1, (off_t) 0, SEEK_SET);
1314                 return fd1;
1315         }
1316
1317         /* dup the fd for incoming message */
1318         if ((fd2 = dup(qd)) == -1) {
1319                 close(fd1);
1320                 return -1;
1321         }
1322
1323         /* now create a FILE pointer for it */
1324         if ((qfp = fdopen(fd2, "r")) == NULL) {
1325                 close(fd1);
1326                 close(fd2);
1327                 return -1;
1328         }
1329
1330         /* dup the fd for temporary file */
1331         if ((fd2 = dup(fd1)) == -1) {
1332                 close(fd1);
1333                 fclose(qfp);
1334                 return -1;
1335         }
1336
1337         /* now create a FILE pointer for it */
1338         if ((ffp = fdopen(fd2, "r+")) == NULL) {
1339                 close(fd1);
1340                 close(fd2);
1341                 fclose(qfp);
1342                 return -1;
1343         }
1344
1345         /*
1346         ** copy message into temporary file
1347         ** and massage the headers.  Save
1348         ** a copy of the "From " line for later.
1349         */
1350         i = strlen("From ");
1351         while (fgets(buffer, sizeof(buffer), qfp)) {
1352                 if (first) {
1353                         first = 0;
1354                         if (strncmp(buffer, "From ", i)==0) {
1355 #ifdef RPATHS
1356                                 char *fp, *cp, *hp, *ep;
1357 #endif
1358                                 /*
1359                                 ** get copy of envelope information
1360                                 ** ("From " line)
1361                                 */
1362                                 envelope = getcpy(buffer);
1363
1364 #if 0
1365                                 /*
1366                                 ** First go ahead and put "From " line
1367                                 ** in message
1368                                 */
1369                                 fputs(buffer, ffp);
1370                                 if (ferror(ffp))
1371                                         goto fputs_error;
1372 #endif
1373
1374 #ifdef RPATHS
1375                                 /*
1376                                 ** Now create a "Return-Path:" line
1377                                 ** from the "From " line.
1378                                 */
1379                                 hp = cp = strchr(fp = envelope + i, ' ');
1380                                 while ((hp = strchr(++hp, 'r')))
1381                                         if (uprf(hp, "remote from")) {
1382                                                 hp = strrchr(hp, ' ');
1383                                                 break;
1384                                         }
1385                                 if (hp) {
1386                                         /*
1387                                         ** return path for UUCP style
1388                                         ** addressing
1389                                         */
1390                                         ep = strchr(++hp, '\n');
1391                                         snprintf(buffer, sizeof(buffer), "Return-Path: %.*s!%.*s\n", (int)(ep - hp), hp, (int)(cp - fp), fp);
1392                                 } else {
1393                                         /*
1394                                         ** return path for standard domain
1395                                         ** addressing
1396                                         */
1397                                         snprintf(buffer, sizeof(buffer), "Return-Path: %.*s\n", (int)(cp - fp), fp);
1398                                 }
1399
1400                                 /* Add Return-Path header to message */
1401                                 fputs(buffer, ffp);
1402                                 if (ferror(ffp))
1403                                         goto fputs_error;
1404 #endif
1405                                 /* Put the delivery date in message */
1406                                 fputs(ddate, ffp);
1407                                 if (ferror(ffp))
1408                                         goto fputs_error;
1409
1410                                 continue;
1411                         }
1412                 }
1413
1414                 fputs(buffer, ffp);
1415                 if (ferror(ffp))
1416                         goto fputs_error;
1417         }
1418
1419         fclose(ffp);
1420         if (ferror(qfp)) {
1421                 close(fd1);
1422                 fclose(qfp);
1423                 return -1;
1424         }
1425         fclose(qfp);
1426         lseek(fd1, (off_t) 0, SEEK_SET);
1427         return fd1;
1428
1429
1430 fputs_error:
1431         close(fd1);
1432         fclose(ffp);
1433         fclose(qfp);
1434         return -1;
1435 }
1436
1437 /*
1438 ** Trim strings for pretty printing of debugging output
1439 */
1440
1441 static char *
1442 trim(char *cp)
1443 {
1444         char buffer[BUFSIZ*4];
1445         unsigned char *bp, *sp;
1446
1447         if (cp == NULL)
1448                 return NULL;
1449
1450         /* copy string into temp buffer */
1451         strncpy(buffer, cp, sizeof(buffer));
1452         bp = buffer;
1453
1454         /* skip over leading whitespace */
1455         while (isspace(*bp))
1456                 bp++;
1457
1458         /* start at the end and zap trailing whitespace */
1459         for (sp = bp + strlen(bp) - 1; sp >= bp; sp--) {
1460                 if (isspace(*sp))
1461                         *sp = 0;
1462                 else
1463                         break;
1464         }
1465
1466         /* replace remaining whitespace with spaces */
1467         for (sp = bp; *sp; sp++)
1468                 if (isspace(*sp))
1469                         *sp = ' ';
1470
1471         /* now return a copy */
1472         return getcpy(bp);
1473 }
1474
1475 /*
1476 ** Function for printing `verbose' messages.
1477 */
1478
1479 static void
1480 verbose_printf(char *fmt, ...)
1481 {
1482         va_list ap;
1483
1484         va_start(ap, fmt);
1485         vfprintf(stdout, fmt, ap);
1486         va_end(ap);
1487
1488         fflush(stdout);  /* now flush output */
1489 }
1490
1491
1492 /*
1493 ** Function for printing `verbose' delivery
1494 ** error messages.
1495 */
1496
1497 static void
1498 adorn(char *what, char *fmt, ...)
1499 {
1500         va_list ap;
1501         int eindex;
1502         char *s;
1503
1504         eindex = errno;  /* save the errno */
1505         fprintf(stdout, ", ");
1506
1507         va_start(ap, fmt);
1508         vfprintf(stdout, fmt, ap);
1509         va_end(ap);
1510
1511         if (what) {
1512                 if (*what)
1513                         fprintf(stdout, " %s: ", what);
1514                 if ((s = strerror(eindex)))
1515                         fprintf(stdout, "%s", s);
1516                 else
1517                         fprintf(stdout, "Error %d", eindex);
1518         }
1519
1520         fputc('\n', stdout);
1521         fflush(stdout);
1522 }
1523
1524
1525 /*
1526 ** Function for printing `debug' messages.
1527 */
1528
1529 static void
1530 debug_printf(char *fmt, ...)
1531 {
1532         va_list ap;
1533
1534         va_start(ap, fmt);
1535         vfprintf(stderr, fmt, ap);
1536         va_end(ap);
1537 }
1538
1539
1540 /*
1541 ** Check ndbm/db file(s) to see if the Message-Id of this
1542 ** message matches the Message-Id of a previous message,
1543 ** so we can discard it.  If it doesn't match, we add the
1544 ** Message-Id of this message to the ndbm/db file.
1545 */
1546 static int
1547 suppress_duplicates(int fd, char *file)
1548 {
1549         int fd1, lockfd, state, result;
1550         char *cp, buf[BUFSIZ], name[NAMESZ];
1551         datum key, value;
1552         DBM *db;
1553         FILE *in;
1554
1555         if ((fd1 = dup(fd)) == -1)
1556                 return -1;
1557         if (!(in = fdopen(fd1, "r"))) {
1558                 close(fd1);
1559                 return -1;
1560         }
1561         rewind(in);
1562
1563         for (state = FLD;;) {
1564                 state = m_getfld(state, name, buf, sizeof(buf), in);
1565                 switch (state) {
1566                 case FLD:
1567                 case FLDPLUS:
1568                 case FLDEOF:
1569                         /* Search for the message ID */
1570                         if (mh_strcasecmp(name, "Message-ID")) {
1571                                 while (state == FLDPLUS)
1572                                         state = m_getfld(state, name, buf,
1573                                                         sizeof(buf), in);
1574                                 continue;
1575                         }
1576
1577                         cp = getcpy(buf);
1578                         while (state == FLDPLUS) {
1579                                 state = m_getfld(state, name, buf,
1580                                                 sizeof(buf), in);
1581                                 cp = add(buf, cp);
1582                         }
1583                         key.dptr = trimcpy(cp);
1584                         key.dsize = strlen(key.dptr) + 1;
1585                         free(cp);
1586                         cp = key.dptr;
1587
1588                         if (!(db = dbm_open(file, O_RDWR | O_CREAT, 0600))) {
1589                                 advise(file, "unable to perform dbm_open on");
1590                                 free(cp);
1591                                 fclose(in);
1592                                 return -1;
1593                         }
1594                         /*
1595                         ** Since it is difficult to portable lock a ndbm
1596                         ** file, we will open and lock the Maildelivery
1597                         ** file instead.  This will fail if your Maildelivery
1598                         ** file doesn't exist.
1599                         */
1600                         if ((lockfd = lkopen(file, O_RDWR, 0)) == -1) {
1601                                 advise(file, "unable to perform file locking on");
1602                                 free(cp);
1603                                 fclose(in);
1604                                 return -1;
1605                         }
1606                         value = dbm_fetch(db, key);
1607                         if (value.dptr) {
1608                                 if (verbose)
1609                                         verbose_printf("Message-ID: %s\n            already received on %s", cp, value.dptr);
1610                                 result = DONE;
1611                         } else {
1612                                 value.dptr  = ddate + sizeof("Delivery-Date:");
1613                                 value.dsize = strlen(value.dptr) + 1;
1614                                 if (dbm_store(db, key, value, DBM_INSERT))
1615                                         advise(file, "possibly corrupt file");
1616                                 result = 0;
1617                         }
1618
1619                         dbm_close(db);
1620                         lkclose(lockfd, file);
1621                         free(cp);
1622                         fclose(in);
1623                         return result;
1624                         break;
1625
1626                 case BODY:
1627                 case BODYEOF:
1628                 case FILEEOF:
1629                         break;
1630
1631                 case LENERR:
1632                 case FMTERR:
1633                 default:
1634                         break;
1635                 }
1636
1637                 break;
1638         }
1639
1640         fclose(in);
1641         return 0;
1642 }