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