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                                 exit(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                                 exit(0);
 197                         case VERSIONSW:
 198                                 print_version(invo_name);
 199                                 exit(0);
 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         return (status != -1 ? RCV_MOK : RCV_MBX);
 401 }
 402
 403
 404 /*
 405 ** Main routine for delivering message.
 406 */
 407 static int
 408 localmail(int fd, char *mdlvr)
 409 {
 410         char buf[BUFSIZ];
 411
 412         /* delivery according to personal Maildelivery file */
 413         if (usr_delivery(fd, mdlvr ? mdlvr : ".maildelivery", 0) != -1) {
 414                 return 0;
 415         }
 416         /* delivery according to global Maildelivery file */
 417         snprintf(buf, sizeof buf, "%s/%s", mhetcdir, "maildelivery");
 418         if (usr_delivery(fd, buf, 1) != -1) {
 419                 return 0;
 420         }
 421         if (verbose) {
 422                 verbose_printf("(delivering to standard mail spool)\n");
 423         }
 424         /* last resort - deliver to standard mail spool */
 425         return usr_file(fd, mbox);
 426 }
 427
 428
 429 #define matches(a,b) (stringdex(b, a) >= 0)
 430
 431 /*
 432 ** Parse the delivery file, and process incoming message.
 433 */
 434 static int
 435 usr_delivery(int fd, char *delivery, int su)
 436 {
 437         int i, accept, status=1, won, vecp, next;
 438         char *field, *pattern, *action, *result, *string;
 439         char buffer[BUFSIZ], tmpbuf[BUFSIZ];
 440         char *cp, *vec[NVEC];
 441         struct stat st;
 442         struct pair *p;
 443         FILE *fp;
 444
 445         /* open the delivery file */
 446         if (!(fp = fopen(delivery, "r"))) {
 447                 return -1;
 448         }
 449         /* check if delivery file has bad ownership or permissions */
 450         if (fstat(fileno(fp), &st) == -1 ||
 451                         (st.st_uid != 0 && (su || st.st_uid != pw->pw_uid)) ||
 452                         st.st_mode & (S_IWGRP|S_IWOTH)) {
 453                 if (verbose) {
 454                         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);
 455                 }
 456                 return -1;
 457         }
 458
 459         won = 0;
 460         next = 1;
 461
 462         /* read and process delivery file */
 463         while (fgets(buffer, sizeof(buffer), fp)) {
 464                 /* skip comments and empty lines */
 465                 if (*buffer == '#' || *buffer == '\n') {
 466                         continue;
 467                 }
 468                 /* zap trailing newline */
 469                 if ((cp = strchr(buffer, '\n'))) {
 470                         *cp = '\0';
 471                 }
 472                 /* split buffer into fields */
 473                 vecp = split(buffer, vec);
 474
 475                 /* check for too few fields */
 476                 if (vecp < 5) {
 477                         if (debug)
 478                                 debug_printf("WARNING: entry with only %d fields, skipping.\n", vecp);
 479                         continue;
 480                 }
 481
 482                 if (debug) {
 483                         for (i = 0; vec[i]; i++) {
 484                                 debug_printf("vec[%d]: \"%s\"\n",
 485                                                 i, trimstr(vec[i]));
 486                         }
 487                 }
 488
 489                 field   = vec[0];
 490                 pattern = vec[1];
 491                 action  = vec[2];
 492                 result  = vec[3];
 493                 string  = vec[4];
 494
 495                 /* find out how to perform the action */
 496                 switch (result[0]) {
 497                 case 'N':
 498                 case 'n':
 499                         /*
 500                         ** If previous condition failed, don't
 501                         ** do this - else fall through
 502                         */
 503                         if (!next) {
 504                                 continue;
 505                         }
 506                         /* fall */
 507
 508                 case '?':
 509                         /*
 510                         ** If already delivered, skip this action.
 511                         ** Else consider delivered if action is
 512                         ** successful.
 513                         */
 514                         if (won) {
 515                                 continue;
 516                         }
 517                         /* fall */
 518
 519                 case 'A':
 520                 case 'a':
 521                         /*
 522                         ** Take action, and consider delivered if
 523                         ** action is successful.
 524                         */
 525                         accept = 1;
 526                         break;
 527
 528                 case 'R':
 529                 case 'r':
 530                 default:
 531                         /*
 532                         ** Take action, but don't consider delivered,
 533                         ** even if action is successful
 534                         */
 535                         accept = 0;
 536                         break;
 537                 }
 538
 539                 /* check if the field matches */
 540                 switch (*field) {
 541                 case '*':
 542                         /* always matches */
 543                         break;
 544
 545                 case 'd':
 546                         /*
 547                         ** "default" matches only if the message hasn't
 548                         ** been delivered yet.
 549                         */
 550                         if (mh_strcasecmp(field, "default")==0) {
 551                                 if (won) {
 552                                         continue;
 553                                 }
 554                                 break;
 555                         }
 556                         /* fall */
 557                 default:
 558                         /* parse message and build lookup table */
 559                         if (!parsed && parse(fd) == -1) {
 560                                 fclose(fp);
 561                                 return -1;
 562                         }
 563                         /*
 564                         ** find header field in lookup table, and
 565                         ** see if the pattern matches.
 566                         */
 567                         if ((p = lookup(hdrs, field)) && p->p_value &&
 568                                         matches(p->p_value, pattern)) {
 569                                 next = 1;
 570                         } else {
 571                                 next = 0;
 572                                 continue;
 573                         }
 574                         break;
 575                 }
 576
 577                 /* find out the action to perform */
 578                 switch (*action) {
 579                 case 'q':
 580                         /* deliver to quoted pipe */
 581                         if (mh_strcasecmp(action, "qpipe")) {
 582                                 continue;
 583                         }
 584                         /* fall */
 585                 case '^':
 586                         expand(tmpbuf, string, fd);
 587                         if (split(tmpbuf, vec) < 1) {
 588                                 continue;
 589                         }
 590                         status = usr_pipe(fd, tmpbuf, vec[0], vec, 0);
 591                         break;
 592
 593                 case 'p':
 594                         /* deliver to pipe */
 595                         if (mh_strcasecmp(action, "pipe")) {
 596                                 continue;
 597                         }
 598                         /* fall */
 599                 case '|':
 600                         vec[2] = "sh";
 601                         vec[3] = "-c";
 602                         expand(tmpbuf, string, fd);
 603                         vec[4] = tmpbuf;
 604                         vec[5] = NULL;
 605                         status = usr_pipe(fd, tmpbuf, "/bin/sh", vec+2, 0);
 606                         break;
 607
 608                 case 'f':
 609                         if (mh_strcasecmp(action, "file")==0) {
 610                                 /* mbox format */
 611                                 status = usr_file(fd, string);
 612                                 break;
 613                         }
 614                         if (mh_strcasecmp(action, "folder")!=0) {
 615                                 continue;
 616                         }
 617                         /* fall */
 618                 case '+':
 619                         /* deliver to nmh folder */
 620                         status = usr_folder(fd, string);
 621                         break;
 622
 623                 case 'm':
 624                         /* mbox format */
 625                         if (mh_strcasecmp(action, "mbox")!=0) {
 626                                 continue;
 627                         }
 628                         /* fall */
 629                 case '>':
 630                         /* mbox format */
 631                         status = usr_file(fd, string);
 632                         break;
 633
 634                 case 'd':
 635                         /* ignore message */
 636                         if (mh_strcasecmp(action, "destroy")!=0) {
 637                                 continue;
 638                         }
 639                         status = 0;
 640                         break;
 641                 }
 642
 643                 if (status) {
 644                         next = 0;  /* action failed, mark for 'N' result */
 645                 } else if (accept) {
 646                         won++;
 647                 }
 648         }
 649
 650         fclose(fp);
 651         return (won ? 0 : -1);
 652 }
 653
 654
 655 /*
 656 ** Split buffer into fields (delimited by whitespace or
 657 ** comma's).  Return the number of fields found.
 658 */
 659 static int
 660 split(char *cp, char **vec)
 661 {
 662         int i;
 663         unsigned char *s;
 664
 665         s = cp;
 666
 667         /* split into a maximum of NVEC fields */
 668         for (i = 0; i <= NVEC;) {
 669                 vec[i] = NULL;
 670
 671                 /* zap any whitespace and comma's */
 672                 while (isspace(*s) || *s == ',') {
 673                         *s++ = '\0';
 674                 }
 675                 /* end of buffer, time to leave */
 676                 if (!*s) {
 677                         break;
 678                 }
 679                 /* get double quote text as a single field */
 680                 if (*s == '"') {
 681                         for (vec[i++] = ++s; *s && *s != '"'; s++) {
 682                                 /*
 683                                 ** Check for escaped double quote.  We need
 684                                 ** to shift the string to remove slash.
 685                                 */
 686                                 if (*s == '\\') {
 687                                         if (*++s == '"') {
 688                                                 strcpy(s - 1, s);
 689                                         }
 690                                         s--;
 691                                 }
 692                         }
 693                         if (*s == '"') {
 694                                 /* zap trailing double quote */
 695                                 *s++ = '\0';
 696                         }
 697                         continue;
 698                 }
 699
 700                 if (*s == '\\' && *++s != '"') {
 701                         s--;
 702                 }
 703                 vec[i++] = s++;
 704
 705                 /* move forward to next field delimiter */
 706                 while (*s && !isspace(*s) && *s != ',') {
 707                         s++;
 708                 }
 709         }
 710         vec[i] = NULL;
 711
 712         return i;
 713 }
 714
 715
 716 /*
 717 ** Parse the headers of a message, and build the
 718 ** lookup table for matching fields and patterns.
 719 */
 720 static int
 721 parse(int fd)
 722 {
 723         int i, state;
 724         int fd1;
 725         char *cp, *dp, *lp;
 726         char name[NAMESZ], field[BUFSIZ];
 727         struct pair *p, *q;
 728         FILE  *in;
 729
 730         if (parsed++) {
 731                 return 0;
 732         }
 733
 734         /* get a new FILE pointer to message */
 735         if ((fd1 = dup(fd)) == -1) {
 736                 return -1;
 737         }
 738         if (!(in = fdopen(fd1, "r"))) {
 739                 close(fd1);
 740                 return -1;
 741         }
 742         rewind(in);
 743
 744         /* add special entries to lookup table */
 745         if ((p = lookup(hdrs, "source"))) {
 746                 p->p_value = getcpy(sender);
 747         }
 748         if ((p = lookup(hdrs, "addr"))) {
 749                 p->p_value = getcpy(addr);
 750         }
 751
 752         /*
 753         ** Scan the headers of the message and build a lookup table.
 754         */
 755         for (i = 0, state = FLD;;) {
 756                 switch (state = m_getfld(state, name, field, sizeof(field),
 757                                 in)) {
 758                 case FLD:
 759                 case FLDEOF:
 760                 case FLDPLUS:
 761                         lp = getcpy(field);
 762                         while (state == FLDPLUS) {
 763                                 state = m_getfld(state, name, field,
 764                                                 sizeof(field), in);
 765                                 lp = add(field, lp);
 766                         }
 767                         for (p = hdrs; p->p_name; p++) {
 768                                 if (mh_strcasecmp(p->p_name, name)!=0) {
 769                                         if (!(p->p_flags & P_HID)) {
 770                                                 if ((cp = p->p_value)) {
 771                                                         if (p->p_flags & P_ADR) {
 772                                                                 dp = cp + strlen(cp) - 1;
 773                                                                 if (*dp == '\n') {
 774                                                                         *dp = '\0';
 775                                                                 }
 776                                                                 cp = add(",\n\t", cp);
 777                                                         } else {
 778                                                                 cp = add("\t", cp);
 779                                                         }
 780                                                 }
 781                                                 p->p_value = add(lp, cp);
 782                                         }
 783                                         free(lp);
 784                                         break;
 785                                 }
 786                         }
 787                         if (!p->p_name && i < NVEC) {
 788                                 p->p_name = getcpy(name);
 789                                 p->p_value = lp;
 790                                 p->p_flags = P_NIL;
 791                                 p++, i++;
 792                                 p->p_name = NULL;
 793                         }
 794                         if (state != FLDEOF) {
 795                                 continue;
 796                         }
 797                         break;
 798
 799                 case BODY:
 800                 case BODYEOF:
 801                 case FILEEOF:
 802                         break;
 803
 804                 case LENERR:
 805                 case FMTERR:
 806                         advise(NULL, "format error in message");
 807                         break;
 808
 809                 default:
 810                         advise(NULL, "internal error in m_getfld");
 811                         fclose(in);
 812                         return -1;
 813                 }
 814                 break;
 815         }
 816         fclose(in);
 817
 818         if ((p = lookup(vars, "reply-to"))) {
 819                 if (!(q = lookup(hdrs, "reply-to")) || !q->p_value) {
 820                         q = lookup(hdrs, "from");
 821                 }
 822                 p->p_value = getcpy(q ? q->p_value : "");
 823                 p->p_flags &= ~P_CHK;
 824                 if (debug) {
 825                         debug_printf("vars[%d]: name=\"%s\" value=\"%s\"\n",
 826                                         p - vars, p->p_name, trimstr(p->p_value));
 827                 }
 828         }
 829         if (debug) {
 830                 for (p = hdrs; p->p_name; p++) {
 831                         debug_printf("hdrs[%d]: name=\"%s\" value=\"%s\"\n",
 832                                         p - hdrs, p->p_name,
 833                                         p->p_value ? trimstr(p->p_value) : "");
 834                 }
 835         }
 836         return 0;
 837 }
 838
 839
 840 /*
 841 ** Expand any builtin variables such as $(sender),
 842 ** $(address), etc., in a string.
 843 */
 844 static void
 845 expand(char *s1, char *s2, int fd)
 846 {
 847         char c, *cp;
 848         struct pair *p;
 849
 850         if (!globbed) {
 851                 glob(fd);
 852         }
 853         while ((c = *s2++)) {
 854                 if (c != '$' || *s2 != '(') {
 855                         *s1++ = c;
 856                 } else {
 857                         for (cp = ++s2; *s2 && *s2 != ')'; s2++) {
 858                                 continue;
 859                         }
 860                         if (*s2 != ')') {
 861                                 s2 = --cp;
 862                                 continue;
 863                         }
 864                         *s2++ = '\0';
 865                         if ((p = lookup(vars, cp))) {
 866                                 if (!parsed && (p->p_flags & P_CHK)) {
 867                                         parse(fd);
 868                                 }
 869                                 strcpy(s1, p->p_value);
 870                                 s1 += strlen(s1);
 871                         }
 872                 }
 873         }
 874         *s1 = '\0';
 875 }
 876
 877
 878 /*
 879 ** Fill in the information missing from the "vars"
 880 ** table, which is necessary to expand any builtin
 881 ** variables in the string for a "pipe" or "qpipe"
 882 ** action.
 883 */
 884 static void
 885 glob(int fd)
 886 {
 887         char buffer[BUFSIZ];
 888         struct stat st;
 889         struct pair *p;
 890
 891         if (globbed++) {
 892                 return;
 893         }
 894         if ((p = lookup(vars, "sender"))) {
 895                 p->p_value = getcpy(sender);
 896         }
 897         if ((p = lookup(vars, "address"))) {
 898                 p->p_value = getcpy(addr);
 899         }
 900         if ((p = lookup(vars, "size"))) {
 901                 snprintf(buffer, sizeof(buffer), "%d",
 902                                 fstat(fd, &st) != -1 ? (int) st.st_size : 0);
 903                 p->p_value = getcpy(buffer);
 904         }
 905         if ((p = lookup(vars, "info"))) {
 906                 p->p_value = getcpy(info);
 907         }
 908         if (debug) {
 909                 for (p = vars; p->p_name; p++) {
 910                         debug_printf("vars[%d]: name=\"%s\" value=\"%s\"\n",
 911                                         p - vars, p->p_name, trimstr(p->p_value));
 912                 }
 913         }
 914 }
 915
 916
 917 /*
 918 ** Find a matching name in a lookup table.  If found,
 919 ** return the "pairs" entry, else return NULL.
 920 */
 921 static struct pair *
 922 lookup(struct pair *pairs, char *key)
 923 {
 924         for (; pairs->p_name; pairs++) {
 925                 if (!mh_strcasecmp(pairs->p_name, key)) {
 926                         return pairs;
 927                 }
 928         }
 929         return NULL;
 930 }
 931
 932
 933 /*
 934 ** Deliver message by appending to a file, using rcvpack(1).
 935 */
 936 static int
 937 usr_file(int fd, char *mailbox)
 938 {
 939         char *vec[3];
 940
 941         if (verbose) {
 942                 verbose_printf("delivering to file \"%s\" (mbox style)",
 943                                 mailbox);
 944         }
 945         vec[0] = "rcvpack";
 946         vec[1] = mailbox;
 947         vec[2] = NULL;
 948
 949         return usr_pipe(fd, "rcvpack", "rcvpack", vec, 1);
 950 }
 951
 952
 953 /*
 954 ** Deliver message to a nmh folder, using rcvstore(1).
 955 */
 956 static int
 957 usr_folder(int fd, char *string)
 958 {
 959         char folder[BUFSIZ], *vec[3];
 960
 961         /* get folder name ready */
 962         if (*string == '+') {
 963                 strncpy(folder, string, sizeof(folder));
 964         }else {
 965                 snprintf(folder, sizeof(folder), "+%s", string);
 966         }
 967         if (verbose) {
 968                 verbose_printf("delivering to folder \"%s\"", folder + 1);
 969         }
 970         vec[0] = "rcvstore";
 971         vec[1] = folder;
 972         vec[2] = NULL;
 973
 974         return usr_pipe(fd, "rcvstore", "rcvstore", vec, 1);
 975 }
 976
 977 /*
 978 ** Deliver message to a process.
 979 */
 980 static int
 981 usr_pipe(int fd, char *cmd, char *pgm, char **vec, int suppress)
 982 {
 983         pid_t child_id;
 984         int bytes, seconds, status, n;
 985         struct stat st;
 986         char *path;
 987
 988         if (verbose && !suppress) {
 989                 verbose_printf("delivering to pipe \"%s\"", cmd);
 990         }
 991         lseek(fd, (off_t) 0, SEEK_SET);
 992
 993         switch ((child_id = fork())) {
 994         case -1:
 995                 /* fork error */
 996                 if (verbose) {
 997                         adorn("fork", "unable to");
 998                 }
 999                 return -1;
1000
1001         case 0:
1002                 /* child process */
1003                 if (fd != 0) {
1004                         dup2(fd, 0);
1005                 }
1006                 freopen("/dev/null", "w", stdout);
1007                 freopen("/dev/null", "w", stderr);
1008                 if (fd != 3) {
1009                         dup2(fd, 3);
1010                 }
1011                 for (n=4; n<OPEN_MAX; n++) {
1012                         close(n);
1013                 }
1014
1015 #ifdef TIOCNOTTY
1016                 if ((fd = open("/dev/tty", O_RDWR)) != -1) {
1017                         ioctl(fd, TIOCNOTTY, NULL);
1018                         close(fd);
1019                 }
1020 #endif /* TIOCNOTTY */
1021
1022                 /* put in own process group */
1023                 setpgid((pid_t) 0, getpid());
1024
1025                 path = getenv("PATH");
1026                 *environ = NULL;
1027                 m_putenv("USER", pw->pw_name);
1028                 m_putenv("HOME", pw->pw_dir);
1029                 m_putenv("SHELL", pw->pw_shell);
1030                 m_putenv("PATH", path);
1031
1032                 execvp(pgm, vec);
1033                 _exit(-1);
1034
1035         default:
1036                 /* parent process */
1037                 if (setjmp(myctx)) {
1038                         /*
1039                         ** Ruthlessly kill the child and anything
1040                         ** else in its process group.
1041                         */
1042                         kill(-child_id, SIGKILL);
1043                         if (verbose)
1044                                 verbose_printf(", timed-out; terminated\n");
1045                         return -1;
1046                 }
1047                 SIGNAL(SIGALRM, alrmser);
1048                 bytes = fstat(fd, &st) != -1 ? (int) st.st_size : 100;
1049
1050                 /* amount of time to wait depends on message size */
1051                 if (bytes <= 100) {
1052                         /* give at least 5 minutes */
1053                         seconds = 300;
1054                 } else if (bytes >= 90000) {
1055                         /* a half hour is long enough */
1056                         seconds = 1800;
1057                 } else {
1058                         seconds = (bytes / 60) + 300;
1059                 }
1060                 alarm((unsigned int) seconds);
1061                 status = pidwait(child_id, 0);
1062                 alarm(0);
1063
1064                 if (verbose) {
1065                         if (!status) {
1066                                 verbose_printf(", success.\n");
1067                         } else if ((status & 0xff00) == 0xff00) {
1068                                 verbose_printf(", system error\n");
1069                         } else {
1070                                 pidstatus(status, stdout, ", failed");
1071                         }
1072                 }
1073                 return (status == 0 ? 0 : -1);
1074         }
1075 }
1076
1077
1078 static void
1079 alrmser(int i)
1080 {
1081         longjmp(myctx, DONE);
1082 }
1083
1084
1085 /*
1086 ** Get the `sender' from the envelope
1087 ** information ("From " line).
1088 */
1089 static void
1090 get_sender(char *envelope, char **sender)
1091 {
1092         int i;
1093         unsigned char *cp;
1094         unsigned char buffer[BUFSIZ];
1095
1096         if (!envelope) {
1097                 *sender = getcpy("");
1098                 return;
1099         }
1100
1101         i = strlen("From ");
1102         strncpy(buffer, envelope + i, sizeof(buffer));
1103         buffer[sizeof buffer -1] = '\0';  /* ensure termination */
1104         if ((cp = strchr(buffer, '\n'))) {
1105                 *cp = '\0';
1106                 cp -= 24;
1107                 if (cp < buffer) {
1108                         cp = buffer;
1109                 }
1110         } else {
1111                 cp = buffer;
1112         }
1113         *cp = '\0';
1114
1115         for (cp = buffer + strlen(buffer) - 1; cp >= buffer; cp--)
1116                 if (isspace(*cp)) {
1117                         *cp = '\0';
1118                 } else {
1119                         break;
1120                 }
1121         *sender = getcpy(buffer);
1122 }
1123
1124
1125 /*
1126 ** Copy message into a temporary file.
1127 ** While copying, it will do some header processing
1128 ** including the extraction of the envelope information.
1129 */
1130 static int
1131 copy_message(int qd, char *tmpfil, int fold)
1132 {
1133         int i, first = 1, fd1, fd2;
1134         char buffer[BUFSIZ];
1135         FILE *qfp, *ffp;
1136         char *tfile = NULL;
1137
1138         tfile = m_mktemp2("/tmp/", invo_name, &fd1, NULL);
1139         if (tfile == NULL) return -1;
1140         fchmod(fd1, 0600);
1141         strncpy(tmpfil, tfile, BUFSIZ);
1142
1143         if (!fold) {
1144                 while ((i = read(qd, buffer, sizeof(buffer))) > 0) {
1145                         if (write(fd1, buffer, i) != i) {
1146 you_lose:
1147                                 close(fd1);
1148                                 unlink(tmpfil);
1149                                 return -1;
1150                         }
1151                 }
1152                 if (i == -1) {
1153                         goto you_lose;
1154                 }
1155                 lseek(fd1, (off_t) 0, SEEK_SET);
1156                 return fd1;
1157         }
1158
1159         /* dup the fd for incoming message */
1160         if ((fd2 = dup(qd)) == -1) {
1161                 close(fd1);
1162                 return -1;
1163         }
1164
1165         /* now create a FILE pointer for it */
1166         if (!(qfp = fdopen(fd2, "r"))) {
1167                 close(fd1);
1168                 close(fd2);
1169                 return -1;
1170         }
1171
1172         /* dup the fd for temporary file */
1173         if ((fd2 = dup(fd1)) == -1) {
1174                 close(fd1);
1175                 fclose(qfp);
1176                 return -1;
1177         }
1178
1179         /* now create a FILE pointer for it */
1180         if (!(ffp = fdopen(fd2, "r+"))) {
1181                 close(fd1);
1182                 close(fd2);
1183                 fclose(qfp);
1184                 return -1;
1185         }
1186
1187         /*
1188         ** copy message into temporary file
1189         ** and massage the headers.  Save
1190         ** a copy of the "From " line for later.
1191         */
1192         i = strlen("From ");
1193         while (fgets(buffer, sizeof(buffer), qfp)) {
1194                 if (first) {
1195                         first = 0;
1196                         if (strncmp(buffer, "From ", i)==0) {
1197                                 /*
1198                                 ** get copy of envelope information
1199                                 ** ("From " line)
1200                                 */
1201                                 envelope = getcpy(buffer);
1202
1203                                 /* Put the delivery date in message */
1204                                 fputs(ddate, ffp);
1205                                 if (ferror(ffp)) {
1206                                         goto fputs_error;
1207                                 }
1208                                 continue;
1209                         }
1210                 }
1211
1212                 fputs(buffer, ffp);
1213                 if (ferror(ffp)) {
1214                         goto fputs_error;
1215                 }
1216         }
1217
1218         fclose(ffp);
1219         if (ferror(qfp)) {
1220                 close(fd1);
1221                 fclose(qfp);
1222                 return -1;
1223         }
1224         fclose(qfp);
1225         lseek(fd1, (off_t) 0, SEEK_SET);
1226         return fd1;
1227
1228 fputs_error:
1229         close(fd1);
1230         fclose(ffp);
1231         fclose(qfp);
1232         return -1;
1233 }
1234
1235 /*
1236 ** Trim strings for pretty printing of debugging output
1237 */
1238 static char *
1239 trimstr(char *cp)
1240 {
1241         char buffer[BUFSIZ*4];
1242         unsigned char *bp, *sp;
1243
1244         if (!cp) {
1245                 return NULL;
1246         }
1247
1248         /* copy string into temp buffer */
1249         strncpy(buffer, cp, sizeof(buffer));
1250         bp = buffer;
1251
1252         /* skip over leading whitespace */
1253         while (isspace(*bp)) {
1254                 bp++;
1255         }
1256         /* start at the end and zap trailing whitespace */
1257         for (sp = bp + strlen(bp) - 1; sp >= bp; sp--) {
1258                 if (isspace(*sp)) {
1259                         *sp = '\0';
1260                 } else {
1261                         break;
1262                 }
1263         }
1264
1265         /* replace remaining whitespace with spaces */
1266         for (sp = bp; *sp; sp++) {
1267                 if (isspace(*sp)) {
1268                         *sp = ' ';
1269                 }
1270         }
1271         return getcpy(bp);
1272 }
1273
1274 /*
1275 ** Function for printing `verbose' messages.
1276 */
1277 static void
1278 verbose_printf(char *fmt, ...)
1279 {
1280         va_list ap;
1281
1282         va_start(ap, fmt);
1283         vfprintf(stdout, fmt, ap);
1284         va_end(ap);
1285         fflush(stdout);
1286 }
1287
1288
1289 /*
1290 ** Function for printing `verbose' delivery
1291 ** error messages.
1292 */
1293 static void
1294 adorn(char *what, char *fmt, ...)
1295 {
1296         va_list ap;
1297         int eindex;
1298         char *s;
1299
1300         eindex = errno;  /* save the errno */
1301         fprintf(stdout, ", ");
1302
1303         va_start(ap, fmt);
1304         vfprintf(stdout, fmt, ap);
1305         va_end(ap);
1306
1307         if (what) {
1308                 if (*what) {
1309                         fprintf(stdout, " %s: ", what);
1310                 }
1311                 if ((s = strerror(eindex))) {
1312                         fprintf(stdout, "%s", s);
1313                 } else {
1314                         fprintf(stdout, "Error %d", eindex);
1315                 }
1316         }
1317
1318         fputc('\n', stdout);
1319         fflush(stdout);
1320 }
1321
1322
1323 /*
1324 ** Function for printing `debug' messages.
1325 */
1326 static void
1327 debug_printf(char *fmt, ...)
1328 {
1329         va_list ap;
1330
1331         va_start(ap, fmt);
1332         vfprintf(stderr, fmt, ap);
1333         va_end(ap);
1334 }