contrib/sendmail-8.14/sendmail/recipient.c

   1 /*
   2  * Copyright (c) 1998-2003, 2006 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  * Copyright (c) 1983, 1995-1997 Eric P. Allman.  All rights reserved.
   5  * Copyright (c) 1988, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * By using this file, you agree to the terms and conditions set
   9  * forth in the LICENSE file which can be found at the top level of
  10  * the sendmail distribution.
  11  *
  12  */
  13
  14 #include <sendmail.h>
  15
  16 SM_RCSID("@(#)$Id: recipient.c,v 8.349 2007/07/10 17:01:22 ca Exp $")
  17
  18 static void     includetimeout __P((int));
  19 static ADDRESS  *self_reference __P((ADDRESS *));
  20 static int      sortexpensive __P((ADDRESS *, ADDRESS *));
  21 static int      sortbysignature __P((ADDRESS *, ADDRESS *));
  22 static int      sorthost __P((ADDRESS *, ADDRESS *));
  23
  24 typedef int     sortfn_t __P((ADDRESS *, ADDRESS *));
  25
  26 /*
  27 **  SORTHOST -- strcmp()-like func for host portion of an ADDRESS
  28 **
  29 **      Parameters:
  30 **              xx -- first ADDRESS
  31 **              yy -- second ADDRESS
  32 **
  33 **      Returns:
  34 **              <0 when xx->q_host is less than yy->q_host
  35 **              >0 when xx->q_host is greater than yy->q_host
  36 **              0 when equal
  37 */
  38
  39 static int
  40 sorthost(xx, yy)
  41         register ADDRESS *xx;
  42         register ADDRESS *yy;
  43 {
  44 #if _FFR_HOST_SORT_REVERSE
  45         /* XXX maybe compare hostnames from the end? */
  46         return sm_strrevcasecmp(xx->q_host, yy->q_host);
  47 #else /* _FFR_HOST_SORT_REVERSE */
  48         return sm_strcasecmp(xx->q_host, yy->q_host);
  49 #endif /* _FFR_HOST_SORT_REVERSE */
  50 }
  51
  52 /*
  53 **  SORTEXPENSIVE -- strcmp()-like func for expensive mailers
  54 **
  55 **  The mailer has been noted already as "expensive" for 'xx'. This
  56 **  will give a result relative to 'yy'. Expensive mailers get rated
  57 **  "greater than" non-expensive mailers because during the delivery phase
  58 **  it will get queued -- no use it getting in the way of less expensive
  59 **  recipients. We avoid an MX RR lookup when both 'xx' and 'yy' are
  60 **  expensive since an MX RR lookup happens when extracted from the queue
  61 **  later.
  62 **
  63 **      Parameters:
  64 **              xx -- first ADDRESS
  65 **              yy -- second ADDRESS
  66 **
  67 **      Returns:
  68 **              <0 when xx->q_host is less than yy->q_host and both are
  69 **                      expensive
  70 **              >0 when xx->q_host is greater than yy->q_host, or when
  71 **                      'yy' is non-expensive
  72 **              0 when equal (by expense and q_host)
  73 */
  74
  75 static int
  76 sortexpensive(xx, yy)
  77         ADDRESS *xx;
  78         ADDRESS *yy;
  79 {
  80         if (!bitnset(M_EXPENSIVE, yy->q_mailer->m_flags))
  81                 return 1; /* xx should go later */
  82 #if _FFR_HOST_SORT_REVERSE
  83         /* XXX maybe compare hostnames from the end? */
  84         return sm_strrevcasecmp(xx->q_host, yy->q_host);
  85 #else /* _FFR_HOST_SORT_REVERSE */
  86         return sm_strcasecmp(xx->q_host, yy->q_host);
  87 #endif /* _FFR_HOST_SORT_REVERSE */
  88 }
  89
  90 /*
  91 **  SORTBYSIGNATURE -- a strcmp()-like func for q_mailer and q_host in ADDRESS
  92 **
  93 **      Parameters:
  94 **              xx -- first ADDRESS
  95 **              yy -- second ADDRESS
  96 **
  97 **      Returns:
  98 **              0 when the "signature"'s are same
  99 **              <0 when xx->q_signature is less than yy->q_signature
 100 **              >0 when xx->q_signature is greater than yy->q_signature
 101 **
 102 **      Side Effect:
 103 **              May set ADDRESS pointer for q_signature if not already set.
 104 */
 105
 106 static int
 107 sortbysignature(xx, yy)
 108         ADDRESS *xx;
 109         ADDRESS *yy;
 110 {
 111         register int ret;
 112
 113         /* Let's avoid redoing the signature over and over again */
 114         if (xx->q_signature == NULL)
 115                 xx->q_signature = hostsignature(xx->q_mailer, xx->q_host);
 116         if (yy->q_signature == NULL)
 117                 yy->q_signature = hostsignature(yy->q_mailer, yy->q_host);
 118         ret = strcmp(xx->q_signature, yy->q_signature);
 119
 120         /*
 121         **  If the two signatures are the same then we will return a sort
 122         **  value based on 'q_user'. But note that we have reversed xx and yy
 123         **  on purpose. This additional compare helps reduce the number of
 124         **  sameaddr() calls and loops in recipient() for the case when
 125         **  the rcpt list has been provided already in-order.
 126         */
 127
 128         if (ret == 0)
 129                 return strcmp(yy->q_user, xx->q_user);
 130         else
 131                 return ret;
 132 }
 133
 134 /*
 135 **  SENDTOLIST -- Designate a send list.
 136 **
 137 **      The parameter is a comma-separated list of people to send to.
 138 **      This routine arranges to send to all of them.
 139 **
 140 **      Parameters:
 141 **              list -- the send list.
 142 **              ctladdr -- the address template for the person to
 143 **                      send to -- effective uid/gid are important.
 144 **                      This is typically the alias that caused this
 145 **                      expansion.
 146 **              sendq -- a pointer to the head of a queue to put
 147 **                      these people into.
 148 **              aliaslevel -- the current alias nesting depth -- to
 149 **                      diagnose loops.
 150 **              e -- the envelope in which to add these recipients.
 151 **
 152 **      Returns:
 153 **              The number of addresses actually on the list.
 154 */
 155
 156 /* q_flags bits inherited from ctladdr */
 157 #define QINHERITEDBITS  (QPINGONSUCCESS|QPINGONFAILURE|QPINGONDELAY|QHASNOTIFY)
 158
 159 int
 160 sendtolist(list, ctladdr, sendq, aliaslevel, e)
 161         char *list;
 162         ADDRESS *ctladdr;
 163         ADDRESS **sendq;
 164         int aliaslevel;
 165         register ENVELOPE *e;
 166 {
 167         register char *p;
 168         register ADDRESS *SM_NONVOLATILE al; /* list of addresses to send to */
 169         SM_NONVOLATILE char delimiter;          /* the address delimiter */
 170         SM_NONVOLATILE int naddrs;
 171         SM_NONVOLATILE int i;
 172         char *endp;
 173         char *oldto = e->e_to;
 174         char *SM_NONVOLATILE bufp;
 175         char buf[MAXNAME + 1];
 176
 177         if (list == NULL)
 178         {
 179                 syserr("sendtolist: null list");
 180                 return 0;
 181         }
 182
 183         if (tTd(25, 1))
 184         {
 185                 sm_dprintf("sendto: %s\n   ctladdr=", list);
 186                 printaddr(sm_debug_file(), ctladdr, false);
 187         }
 188
 189         /* heuristic to determine old versus new style addresses */
 190         if (ctladdr == NULL &&
 191             (strchr(list, ',') != NULL || strchr(list, ';') != NULL ||
 192              strchr(list, '<') != NULL || strchr(list, '(') != NULL))
 193                 e->e_flags &= ~EF_OLDSTYLE;
 194         delimiter = ' ';
 195         if (!bitset(EF_OLDSTYLE, e->e_flags) || ctladdr != NULL)
 196                 delimiter = ',';
 197
 198         al = NULL;
 199         naddrs = 0;
 200
 201         /* make sure we have enough space to copy the string */
 202         i = strlen(list) + 1;
 203         if (i <= sizeof(buf))
 204         {
 205                 bufp = buf;
 206                 i = sizeof(buf);
 207         }
 208         else
 209                 bufp = sm_malloc_x(i);
 210         endp = bufp + i;
 211
 212         SM_TRY
 213         {
 214                 (void) sm_strlcpy(bufp, denlstring(list, false, true), i);
 215
 216                 macdefine(&e->e_macro, A_PERM, macid("{addr_type}"), "e r");
 217                 for (p = bufp; *p != '\0'; )
 218                 {
 219                         auto char *delimptr;
 220                         register ADDRESS *a;
 221
 222                         SM_ASSERT(p < endp);
 223
 224                         /* parse the address */
 225                         while ((isascii(*p) && isspace(*p)) || *p == ',')
 226                                 p++;
 227                         SM_ASSERT(p < endp);
 228                         a = parseaddr(p, NULLADDR, RF_COPYALL, delimiter,
 229                                       &delimptr, e, true);
 230                         p = delimptr;
 231                         SM_ASSERT(p < endp);
 232                         if (a == NULL)
 233                                 continue;
 234                         a->q_next = al;
 235                         a->q_alias = ctladdr;
 236
 237                         /* arrange to inherit attributes from parent */
 238                         if (ctladdr != NULL)
 239                         {
 240                                 ADDRESS *b;
 241
 242                                 /* self reference test */
 243                                 if (sameaddr(ctladdr, a))
 244                                 {
 245                                         if (tTd(27, 5))
 246                                         {
 247                                                 sm_dprintf("sendtolist: QSELFREF ");
 248                                                 printaddr(sm_debug_file(), ctladdr, false);
 249                                         }
 250                                         ctladdr->q_flags |= QSELFREF;
 251                                 }
 252
 253                                 /* check for address loops */
 254                                 b = self_reference(a);
 255                                 if (b != NULL)
 256                                 {
 257                                         b->q_flags |= QSELFREF;
 258                                         if (tTd(27, 5))
 259                                         {
 260                                                 sm_dprintf("sendtolist: QSELFREF ");
 261                                                 printaddr(sm_debug_file(), b, false);
 262                                         }
 263                                         if (a != b)
 264                                         {
 265                                                 if (tTd(27, 5))
 266                                                 {
 267                                                         sm_dprintf("sendtolist: QS_DONTSEND ");
 268                                                         printaddr(sm_debug_file(), a, false);
 269                                                 }
 270                                                 a->q_state = QS_DONTSEND;
 271                                                 b->q_flags |= a->q_flags & QNOTREMOTE;
 272                                                 continue;
 273                                         }
 274                                 }
 275
 276                                 /* full name */
 277                                 if (a->q_fullname == NULL)
 278                                         a->q_fullname = ctladdr->q_fullname;
 279
 280                                 /* various flag bits */
 281                                 a->q_flags &= ~QINHERITEDBITS;
 282                                 a->q_flags |= ctladdr->q_flags & QINHERITEDBITS;
 283
 284                                 /* DSN recipient information */
 285                                 a->q_finalrcpt = ctladdr->q_finalrcpt;
 286                                 a->q_orcpt = ctladdr->q_orcpt;
 287                         }
 288
 289                         al = a;
 290                 }
 291
 292                 /* arrange to send to everyone on the local send list */
 293                 while (al != NULL)
 294                 {
 295                         register ADDRESS *a = al;
 296
 297                         al = a->q_next;
 298                         a = recipient(a, sendq, aliaslevel, e);
 299                         naddrs++;
 300                 }
 301         }
 302         SM_FINALLY
 303         {
 304                 e->e_to = oldto;
 305                 if (bufp != buf)
 306                         sm_free(bufp);
 307                 macdefine(&e->e_macro, A_PERM, macid("{addr_type}"), NULL);
 308         }
 309         SM_END_TRY
 310         return naddrs;
 311 }
 312
 313 #if MILTER
 314 /*
 315 **  REMOVEFROMLIST -- Remove addresses from a send list.
 316 **
 317 **      The parameter is a comma-separated list of recipients to remove.
 318 **      Note that it only deletes matching addresses.  If those addresses
 319 **      have been expanded already in the sendq, it won't mark the
 320 **      expanded recipients as QS_REMOVED.
 321 **
 322 **      Parameters:
 323 **              list -- the list to remove.
 324 **              sendq -- a pointer to the head of a queue to remove
 325 **                      these addresses from.
 326 **              e -- the envelope in which to remove these recipients.
 327 **
 328 **      Returns:
 329 **              The number of addresses removed from the list.
 330 **
 331 */
 332
 333 int
 334 removefromlist(list, sendq, e)
 335         char *list;
 336         ADDRESS **sendq;
 337         ENVELOPE *e;
 338 {
 339         SM_NONVOLATILE char delimiter;          /* the address delimiter */
 340         SM_NONVOLATILE int naddrs;
 341         SM_NONVOLATILE int i;
 342         char *p;
 343         char *oldto = e->e_to;
 344         char *SM_NONVOLATILE bufp;
 345         char buf[MAXNAME + 1];
 346
 347         if (list == NULL)
 348         {
 349                 syserr("removefromlist: null list");
 350                 return 0;
 351         }
 352
 353         if (tTd(25, 1))
 354                 sm_dprintf("removefromlist: %s\n", list);
 355
 356         /* heuristic to determine old versus new style addresses */
 357         if (strchr(list, ',') != NULL || strchr(list, ';') != NULL ||
 358             strchr(list, '<') != NULL || strchr(list, '(') != NULL)
 359                 e->e_flags &= ~EF_OLDSTYLE;
 360         delimiter = ' ';
 361         if (!bitset(EF_OLDSTYLE, e->e_flags))
 362                 delimiter = ',';
 363
 364         naddrs = 0;
 365
 366         /* make sure we have enough space to copy the string */
 367         i = strlen(list) + 1;
 368         if (i <= sizeof(buf))
 369         {
 370                 bufp = buf;
 371                 i = sizeof(buf);
 372         }
 373         else
 374                 bufp = sm_malloc_x(i);
 375
 376         SM_TRY
 377         {
 378                 (void) sm_strlcpy(bufp, denlstring(list, false, true), i);
 379
 380 #if _FFR_ADDR_TYPE_MODES
 381                 if (AddrTypeModes)
 382                         macdefine(&e->e_macro, A_PERM, macid("{addr_type}"),
 383                                   "e r d");
 384                 else
 385 #endif /* _FFR_ADDR_TYPE_MODES */
 386                 macdefine(&e->e_macro, A_PERM, macid("{addr_type}"), "e r");
 387                 for (p = bufp; *p != '\0'; )
 388                 {
 389                         ADDRESS a;      /* parsed address to be removed */
 390                         ADDRESS *q;
 391                         ADDRESS **pq;
 392                         char *delimptr;
 393
 394                         /* parse the address */
 395                         while ((isascii(*p) && isspace(*p)) || *p == ',')
 396                                 p++;
 397                         if (parseaddr(p, &a, RF_COPYALL|RF_RM_ADDR,
 398                                       delimiter, &delimptr, e, true) == NULL)
 399                         {
 400                                 p = delimptr;
 401                                 continue;
 402                         }
 403                         p = delimptr;
 404                         for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next)
 405                         {
 406                                 if (!QS_IS_DEAD(q->q_state) &&
 407                                     (sameaddr(q, &a) ||
 408                                      strcmp(q->q_paddr, a.q_paddr) == 0))
 409                                 {
 410                                         if (tTd(25, 5))
 411                                         {
 412                                                 sm_dprintf("removefromlist: QS_REMOVED ");
 413                                                 printaddr(sm_debug_file(), &a, false);
 414                                         }
 415                                         q->q_state = QS_REMOVED;
 416                                         naddrs++;
 417                                         break;
 418                                 }
 419                         }
 420                 }
 421         }
 422         SM_FINALLY
 423         {
 424                 e->e_to = oldto;
 425                 if (bufp != buf)
 426                         sm_free(bufp);
 427                 macdefine(&e->e_macro, A_PERM, macid("{addr_type}"), NULL);
 428         }
 429         SM_END_TRY
 430         return naddrs;
 431 }
 432 #endif /* MILTER */
 433
 434 /*
 435 **  RECIPIENT -- Designate a message recipient
 436 **      Saves the named person for future mailing (after some checks).
 437 **
 438 **      Parameters:
 439 **              new -- the (preparsed) address header for the recipient.
 440 **              sendq -- a pointer to the head of a queue to put the
 441 **                      recipient in.  Duplicate suppression is done
 442 **                      in this queue.
 443 **              aliaslevel -- the current alias nesting depth.
 444 **              e -- the current envelope.
 445 **
 446 **      Returns:
 447 **              The actual address in the queue.  This will be "a" if
 448 **              the address is not a duplicate, else the original address.
 449 **
 450 */
 451
 452 ADDRESS *
 453 recipient(new, sendq, aliaslevel, e)
 454         register ADDRESS *new;
 455         register ADDRESS **sendq;
 456         int aliaslevel;
 457         register ENVELOPE *e;
 458 {
 459         register ADDRESS *q;
 460         ADDRESS **pq;
 461         ADDRESS **prev;
 462         register struct mailer *m;
 463         register char *p;
 464         int i, buflen;
 465         bool quoted;            /* set if the addr has a quote bit */
 466         bool insert;
 467         int findusercount;
 468         bool initialdontsend;
 469         char *buf;
 470         char buf0[MAXNAME + 1];         /* unquoted image of the user name */
 471         sortfn_t *sortfn;
 472
 473         p = NULL;
 474         quoted = false;
 475         insert = false;
 476         findusercount = 0;
 477         initialdontsend = QS_IS_DEAD(new->q_state);
 478         e->e_to = new->q_paddr;
 479         m = new->q_mailer;
 480         errno = 0;
 481         if (aliaslevel == 0)
 482                 new->q_flags |= QPRIMARY;
 483         if (tTd(26, 1))
 484         {
 485                 sm_dprintf("\nrecipient (%d): ", aliaslevel);
 486                 printaddr(sm_debug_file(), new, false);
 487         }
 488
 489         /* if this is primary, use it as original recipient */
 490         if (new->q_alias == NULL)
 491         {
 492                 if (e->e_origrcpt == NULL)
 493                         e->e_origrcpt = new->q_paddr;
 494                 else if (e->e_origrcpt != new->q_paddr)
 495                         e->e_origrcpt = "";
 496         }
 497
 498         /* find parent recipient for finalrcpt and orcpt */
 499         for (q = new; q->q_alias != NULL; q = q->q_alias)
 500                 continue;
 501
 502         /* find final recipient DSN address */
 503         if (new->q_finalrcpt == NULL &&
 504             e->e_from.q_mailer != NULL)
 505         {
 506                 char frbuf[MAXLINE];
 507
 508                 p = e->e_from.q_mailer->m_addrtype;
 509                 if (p == NULL)
 510                         p = "rfc822";
 511                 if (sm_strcasecmp(p, "rfc822") != 0)
 512                 {
 513                         (void) sm_snprintf(frbuf, sizeof(frbuf), "%s; %.800s",
 514                                            q->q_mailer->m_addrtype,
 515                                            q->q_user);
 516                 }
 517                 else if (strchr(q->q_user, '@') != NULL)
 518                 {
 519                         (void) sm_snprintf(frbuf, sizeof(frbuf), "%s; %.800s",
 520                                            p, q->q_user);
 521                 }
 522                 else if (strchr(q->q_paddr, '@') != NULL)
 523                 {
 524                         char *qp;
 525                         bool b;
 526
 527                         qp = q->q_paddr;
 528
 529                         /* strip brackets from address */
 530                         b = false;
 531                         if (*qp == '<')
 532                         {
 533                                 b = qp[strlen(qp) - 1] == '>';
 534                                 if (b)
 535                                         qp[strlen(qp) - 1] = '\0';
 536                                 qp++;
 537                         }
 538                         (void) sm_snprintf(frbuf, sizeof(frbuf), "%s; %.800s",
 539                                            p, qp);
 540
 541                         /* undo damage */
 542                         if (b)
 543                                 qp[strlen(qp)] = '>';
 544                 }
 545                 else
 546                 {
 547                         (void) sm_snprintf(frbuf, sizeof(frbuf),
 548                                            "%s; %.700s@%.100s",
 549                                            p, q->q_user, MyHostName);
 550                 }
 551                 new->q_finalrcpt = sm_rpool_strdup_x(e->e_rpool, frbuf);
 552         }
 553
 554 #if _FFR_GEN_ORCPT
 555         /* set ORCPT DSN arg if not already set */
 556         if (new->q_orcpt == NULL)
 557         {
 558                 /* check for an existing ORCPT */
 559                 if (q->q_orcpt != NULL)
 560                         new->q_orcpt = q->q_orcpt;
 561                 else
 562                 {
 563                         /* make our own */
 564                         bool b = false;
 565                         char *qp;
 566                         char obuf[MAXLINE];
 567
 568                         if (e->e_from.q_mailer != NULL)
 569                                 p = e->e_from.q_mailer->m_addrtype;
 570                         if (p == NULL)
 571                                 p = "rfc822";
 572                         (void) sm_strlcpyn(obuf, sizeof(obuf), 2, p, ";");
 573
 574                         qp = q->q_paddr;
 575
 576                         /* FFR: Needs to strip comments from stdin addrs */
 577
 578                         /* strip brackets from address */
 579                         if (*qp == '<')
 580                         {
 581                                 b = qp[strlen(qp) - 1] == '>';
 582                                 if (b)
 583                                         qp[strlen(qp) - 1] = '\0';
 584                                 qp++;
 585                         }
 586
 587                         p = xtextify(denlstring(qp, true, false), "=");
 588
 589                         if (sm_strlcat(obuf, p, sizeof(obuf)) >= sizeof(obuf))
 590                         {
 591                                 /* if too big, don't use it */
 592                                 obuf[0] = '\0';
 593                         }
 594
 595                         /* undo damage */
 596                         if (b)
 597                                 qp[strlen(qp)] = '>';
 598
 599                         if (obuf[0] != '\0')
 600                                 new->q_orcpt =
 601                                         sm_rpool_strdup_x(e->e_rpool, obuf);
 602                 }
 603         }
 604 #endif /* _FFR_GEN_ORCPT */
 605
 606         /* break aliasing loops */
 607         if (aliaslevel > MaxAliasRecursion)
 608         {
 609                 new->q_state = QS_BADADDR;
 610                 new->q_status = "5.4.6";
 611                 if (new->q_alias != NULL)
 612                 {
 613                         new->q_alias->q_state = QS_BADADDR;
 614                         new->q_alias->q_status = "5.4.6";
 615                 }
 616                 if ((SuprErrs || !LogUsrErrs) && LogLevel > 0)
 617                 {
 618                         sm_syslog(LOG_ERR, e->e_id,
 619                                 "aliasing/forwarding loop broken: %s (%d aliases deep; %d max)",
 620                                 FileName != NULL ? FileName : "", aliaslevel,
 621                                 MaxAliasRecursion);
 622                 }
 623                 usrerrenh(new->q_status,
 624                           "554 aliasing/forwarding loop broken (%d aliases deep; %d max)",
 625                           aliaslevel, MaxAliasRecursion);
 626                 return new;
 627         }
 628
 629         /*
 630         **  Finish setting up address structure.
 631         */
 632
 633         /* get unquoted user for file, program or user.name check */
 634         i = strlen(new->q_user);
 635         if (i >= sizeof(buf0))
 636         {
 637                 buflen = i + 1;
 638                 buf = xalloc(buflen);
 639         }
 640         else
 641         {
 642                 buf = buf0;
 643                 buflen = sizeof(buf0);
 644         }
 645         (void) sm_strlcpy(buf, new->q_user, buflen);
 646         for (p = buf; *p != '\0' && !quoted; p++)
 647         {
 648                 if (*p == '\\')
 649                         quoted = true;
 650         }
 651         stripquotes(buf);
 652
 653         /* check for direct mailing to restricted mailers */
 654         if (m == ProgMailer)
 655         {
 656                 if (new->q_alias == NULL || UseMSP ||
 657                     bitset(EF_UNSAFE, e->e_flags))
 658                 {
 659                         new->q_state = QS_BADADDR;
 660                         new->q_status = "5.7.1";
 661                         usrerrenh(new->q_status,
 662                                   "550 Cannot mail directly to programs");
 663                 }
 664                 else if (bitset(QBOGUSSHELL, new->q_alias->q_flags))
 665                 {
 666                         new->q_state = QS_BADADDR;
 667                         new->q_status = "5.7.1";
 668                         if (new->q_alias->q_ruser == NULL)
 669                                 usrerrenh(new->q_status,
 670                                           "550 UID %d is an unknown user: cannot mail to programs",
 671                                           new->q_alias->q_uid);
 672                         else
 673                                 usrerrenh(new->q_status,
 674                                           "550 User %s@%s doesn't have a valid shell for mailing to programs",
 675                                           new->q_alias->q_ruser, MyHostName);
 676                 }
 677                 else if (bitset(QUNSAFEADDR, new->q_alias->q_flags))
 678                 {
 679                         new->q_state = QS_BADADDR;
 680                         new->q_status = "5.7.1";
 681                         new->q_rstatus = "550 Unsafe for mailing to programs";
 682                         usrerrenh(new->q_status,
 683                                   "550 Address %s is unsafe for mailing to programs",
 684                                   new->q_alias->q_paddr);
 685                 }
 686         }
 687
 688         /*
 689         **  Look up this person in the recipient list.
 690         **      If they are there already, return, otherwise continue.
 691         **      If the list is empty, just add it.  Notice the cute
 692         **      hack to make from addresses suppress things correctly:
 693         **      the QS_DUPLICATE state will be set in the send list.
 694         **      [Please note: the emphasis is on "hack."]
 695         */
 696
 697         prev = NULL;
 698
 699         /*
 700         **  If this message is going to the queue or FastSplit is set
 701         **  and it is the first try and the envelope hasn't split, then we
 702         **  avoid doing an MX RR lookup now because one will be done when the
 703         **  message is extracted from the queue later. It can go to the queue
 704         **  because all messages are going to the queue or this mailer of
 705         **  the current recipient is marked expensive.
 706         */
 707
 708         if (UseMSP || WILL_BE_QUEUED(e->e_sendmode) ||
 709             (!bitset(EF_SPLIT, e->e_flags) && e->e_ntries == 0 &&
 710              FastSplit > 0))
 711                 sortfn = sorthost;
 712         else if (NoConnect && bitnset(M_EXPENSIVE, new->q_mailer->m_flags))
 713                 sortfn = sortexpensive;
 714         else
 715                 sortfn = sortbysignature;
 716
 717         for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next)
 718         {
 719                 /*
 720                 **  If address is "less than" it should be inserted now.
 721                 **  If address is "greater than" current comparison it'll
 722                 **  insert later in the list; so loop again (if possible).
 723                 **  If address is "equal" (different equal than sameaddr()
 724                 **  call) then check if sameaddr() will be true.
 725                 **  Because this list is now sorted, it'll mean fewer
 726                 **  comparisons and fewer loops which is important for more
 727                 **  recipients.
 728                 */
 729
 730                 i = (*sortfn)(new, q);
 731                 if (i == 0) /* equal */
 732                 {
 733                         /*
 734                         **  Sortbysignature() has said that the two have
 735                         **  equal MX RR's and the same user. Calling sameaddr()
 736                         **  now checks if the two hosts are as identical as the
 737                         **  MX RR's are (which might not be the case)
 738                         **  before saying these are the identical addresses.
 739                         */
 740
 741                         if (sameaddr(q, new) &&
 742                             (bitset(QRCPTOK, q->q_flags) ||
 743                              !bitset(QPRIMARY, q->q_flags)))
 744                         {
 745                                 if (tTd(26, 1))
 746                                 {
 747                                         sm_dprintf("%s in sendq: ",
 748                                                    new->q_paddr);
 749                                         printaddr(sm_debug_file(), q, false);
 750                                 }
 751                                 if (!bitset(QPRIMARY, q->q_flags))
 752                                 {
 753                                         if (!QS_IS_DEAD(new->q_state))
 754                                                 message("duplicate suppressed");
 755                                         else
 756                                                 q->q_state = QS_DUPLICATE;
 757                                         q->q_flags |= new->q_flags;
 758                                 }
 759                                 else if (bitset(QSELFREF, q->q_flags)
 760                                          || q->q_state == QS_REMOVED)
 761                                 {
 762                                         /*
 763                                         **  If an earlier milter removed the
 764                                         **  address, a later one can still add
 765                                         **  it back.
 766                                         */
 767
 768                                         q->q_state = new->q_state;
 769                                         q->q_flags |= new->q_flags;
 770                                 }
 771                                 new = q;
 772                                 goto done;
 773                         }
 774                 }
 775                 else if (i < 0) /* less than */
 776                 {
 777                         insert = true;
 778                         break;
 779                 }
 780                 prev = pq;
 781         }
 782
 783         /* pq should point to an address, never NULL */
 784         SM_ASSERT(pq != NULL);
 785
 786         /* add address on list */
 787         if (insert)
 788         {
 789                 /*
 790                 **  insert before 'pq'. Only possible when at least 1
 791                 **  ADDRESS is in the list already.
 792                 */
 793
 794                 new->q_next = *pq;
 795                 if (prev == NULL)
 796                         *sendq = new; /* To be the first ADDRESS */
 797                 else
 798                         (*prev)->q_next = new;
 799         }
 800         else
 801         {
 802                 /*
 803                 **  Place in list at current 'pq' position. Possible
 804                 **  when there are 0 or more ADDRESS's in the list.
 805                 */
 806
 807                 new->q_next = NULL;
 808                 *pq = new;
 809         }
 810
 811         /* added a new address: clear split flag */
 812         e->e_flags &= ~EF_SPLIT;
 813
 814         /*
 815         **  Alias the name and handle special mailer types.
 816         */
 817
 818   trylocaluser:
 819         if (tTd(29, 7))
 820         {
 821                 sm_dprintf("at trylocaluser: ");
 822                 printaddr(sm_debug_file(), new, false);
 823         }
 824
 825         if (!QS_IS_OK(new->q_state))
 826         {
 827                 if (QS_IS_UNDELIVERED(new->q_state))
 828                         e->e_nrcpts++;
 829                 goto testselfdestruct;
 830         }
 831
 832         if (m == InclMailer)
 833         {
 834                 new->q_state = QS_INCLUDED;
 835                 if (new->q_alias == NULL || UseMSP ||
 836                     bitset(EF_UNSAFE, e->e_flags))
 837                 {
 838                         new->q_state = QS_BADADDR;
 839                         new->q_status = "5.7.1";
 840                         usrerrenh(new->q_status,
 841                                   "550 Cannot mail directly to :include:s");
 842                 }
 843                 else
 844                 {
 845                         int ret;
 846
 847                         message("including file %s", new->q_user);
 848                         ret = include(new->q_user, false, new,
 849                                       sendq, aliaslevel, e);
 850                         if (transienterror(ret))
 851                         {
 852                                 if (LogLevel > 2)
 853                                         sm_syslog(LOG_ERR, e->e_id,
 854                                                   "include %s: transient error: %s",
 855                                                   shortenstring(new->q_user,
 856                                                                 MAXSHORTSTR),
 857                                                                 sm_errstring(ret));
 858                                 new->q_state = QS_QUEUEUP;
 859                                 usrerr("451 4.2.4 Cannot open %s: %s",
 860                                         shortenstring(new->q_user,
 861                                                       MAXSHORTSTR),
 862                                         sm_errstring(ret));
 863                         }
 864                         else if (ret != 0)
 865                         {
 866                                 new->q_state = QS_BADADDR;
 867                                 new->q_status = "5.2.4";
 868                                 usrerrenh(new->q_status,
 869                                           "550 Cannot open %s: %s",
 870                                           shortenstring(new->q_user,
 871                                                         MAXSHORTSTR),
 872                                           sm_errstring(ret));
 873                         }
 874                 }
 875         }
 876         else if (m == FileMailer)
 877         {
 878                 /* check if allowed */
 879                 if (new->q_alias == NULL || UseMSP ||
 880                     bitset(EF_UNSAFE, e->e_flags))
 881                 {
 882                         new->q_state = QS_BADADDR;
 883                         new->q_status = "5.7.1";
 884                         usrerrenh(new->q_status,
 885                                   "550 Cannot mail directly to files");
 886                 }
 887                 else if (bitset(QBOGUSSHELL, new->q_alias->q_flags))
 888                 {
 889                         new->q_state = QS_BADADDR;
 890                         new->q_status = "5.7.1";
 891                         if (new->q_alias->q_ruser == NULL)
 892                                 usrerrenh(new->q_status,
 893                                           "550 UID %d is an unknown user: cannot mail to files",
 894                                           new->q_alias->q_uid);
 895                         else
 896                                 usrerrenh(new->q_status,
 897                                           "550 User %s@%s doesn't have a valid shell for mailing to files",
 898                                           new->q_alias->q_ruser, MyHostName);
 899                 }
 900                 else if (bitset(QUNSAFEADDR, new->q_alias->q_flags))
 901                 {
 902                         new->q_state = QS_BADADDR;
 903                         new->q_status = "5.7.1";
 904                         new->q_rstatus = "550 Unsafe for mailing to files";
 905                         usrerrenh(new->q_status,
 906                                   "550 Address %s is unsafe for mailing to files",
 907                                   new->q_alias->q_paddr);
 908                 }
 909         }
 910
 911         /* try aliasing */
 912         if (!quoted && QS_IS_OK(new->q_state) &&
 913             bitnset(M_ALIASABLE, m->m_flags))
 914                 alias(new, sendq, aliaslevel, e);
 915
 916 #if USERDB
 917         /* if not aliased, look it up in the user database */
 918         if (!bitset(QNOTREMOTE, new->q_flags) &&
 919             QS_IS_SENDABLE(new->q_state) &&
 920             bitnset(M_CHECKUDB, m->m_flags))
 921         {
 922                 if (udbexpand(new, sendq, aliaslevel, e) == EX_TEMPFAIL)
 923                 {
 924                         new->q_state = QS_QUEUEUP;
 925                         if (e->e_message == NULL)
 926                                 e->e_message = sm_rpool_strdup_x(e->e_rpool,
 927                                                 "Deferred: user database error");
 928                         if (new->q_message == NULL)
 929                                 new->q_message = "Deferred: user database error";
 930                         if (LogLevel > 8)
 931                                 sm_syslog(LOG_INFO, e->e_id,
 932                                           "deferred: udbexpand: %s",
 933                                           sm_errstring(errno));
 934                         message("queued (user database error): %s",
 935                                 sm_errstring(errno));
 936                         e->e_nrcpts++;
 937                         goto testselfdestruct;
 938                 }
 939         }
 940 #endif /* USERDB */
 941
 942         /*
 943         **  If we have a level two config file, then pass the name through
 944         **  Ruleset 5 before sending it off.  Ruleset 5 has the right
 945         **  to rewrite it to another mailer.  This gives us a hook
 946         **  after local aliasing has been done.
 947         */
 948
 949         if (tTd(29, 5))
 950         {
 951                 sm_dprintf("recipient: testing local?  cl=%d, rr5=%p\n\t",
 952                            ConfigLevel, RewriteRules[5]);
 953                 printaddr(sm_debug_file(), new, false);
 954         }
 955         if (ConfigLevel >= 2 && RewriteRules[5] != NULL &&
 956             bitnset(M_TRYRULESET5, m->m_flags) &&
 957             !bitset(QNOTREMOTE, new->q_flags) &&
 958             QS_IS_OK(new->q_state))
 959         {
 960                 maplocaluser(new, sendq, aliaslevel + 1, e);
 961         }
 962
 963         /*
 964         **  If it didn't get rewritten to another mailer, go ahead
 965         **  and deliver it.
 966         */
 967
 968         if (QS_IS_OK(new->q_state) &&
 969             bitnset(M_HASPWENT, m->m_flags))
 970         {
 971                 auto bool fuzzy;
 972                 SM_MBDB_T user;
 973                 int status;
 974
 975                 /* warning -- finduser may trash buf */
 976                 status = finduser(buf, &fuzzy, &user);
 977                 switch (status)
 978                 {
 979                   case EX_TEMPFAIL:
 980                         new->q_state = QS_QUEUEUP;
 981                         new->q_status = "4.5.2";
 982                         giveresponse(EX_TEMPFAIL, new->q_status, m, NULL,
 983                                      new->q_alias, (time_t) 0, e, new);
 984                         break;
 985                   default:
 986                         new->q_state = QS_BADADDR;
 987                         new->q_status = "5.1.1";
 988                         new->q_rstatus = "550 5.1.1 User unknown";
 989                         giveresponse(EX_NOUSER, new->q_status, m, NULL,
 990                                      new->q_alias, (time_t) 0, e, new);
 991                         break;
 992                   case EX_OK:
 993                         if (fuzzy)
 994                         {
 995                                 /* name was a fuzzy match */
 996                                 new->q_user = sm_rpool_strdup_x(e->e_rpool,
 997                                                                 user.mbdb_name);
 998                                 if (findusercount++ > 3)
 999                                 {
1000                                         new->q_state = QS_BADADDR;
1001                                         new->q_status = "5.4.6";
1002                                         usrerrenh(new->q_status,
1003                                                   "554 aliasing/forwarding loop for %s broken",
1004                                                   user.mbdb_name);
1005                                         goto done;
1006                                 }
1007
1008                                 /* see if it aliases */
1009                                 (void) sm_strlcpy(buf, user.mbdb_name, buflen);
1010                                 goto trylocaluser;
1011                         }
1012                         if (*user.mbdb_homedir == '\0')
1013                                 new->q_home = NULL;
1014                         else if (strcmp(user.mbdb_homedir, "/") == 0)
1015                                 new->q_home = "";
1016                         else
1017                                 new->q_home = sm_rpool_strdup_x(e->e_rpool,
1018                                                         user.mbdb_homedir);
1019                         if (user.mbdb_uid != SM_NO_UID)
1020                         {
1021                                 new->q_uid = user.mbdb_uid;
1022                                 new->q_gid = user.mbdb_gid;
1023                                 new->q_flags |= QGOODUID;
1024                         }
1025                         new->q_ruser = sm_rpool_strdup_x(e->e_rpool,
1026                                                          user.mbdb_name);
1027                         if (user.mbdb_fullname[0] != '\0')
1028                                 new->q_fullname = sm_rpool_strdup_x(e->e_rpool,
1029                                                         user.mbdb_fullname);
1030                         if (!usershellok(user.mbdb_name, user.mbdb_shell))
1031                         {
1032                                 new->q_flags |= QBOGUSSHELL;
1033                         }
1034                         if (bitset(EF_VRFYONLY, e->e_flags))
1035                         {
1036                                 /* don't do any more now */
1037                                 new->q_state = QS_VERIFIED;
1038                         }
1039                         else if (!quoted)
1040                                 forward(new, sendq, aliaslevel, e);
1041                 }
1042         }
1043         if (!QS_IS_DEAD(new->q_state))
1044                 e->e_nrcpts++;
1045
1046   testselfdestruct:
1047         new->q_flags |= QTHISPASS;
1048         if (tTd(26, 8))
1049         {
1050                 sm_dprintf("testselfdestruct: ");
1051                 printaddr(sm_debug_file(), new, false);
1052                 if (tTd(26, 10))
1053                 {
1054                         sm_dprintf("SENDQ:\n");
1055                         printaddr(sm_debug_file(), *sendq, true);
1056                         sm_dprintf("----\n");
1057                 }
1058         }
1059         if (new->q_alias == NULL && new != &e->e_from &&
1060             QS_IS_DEAD(new->q_state))
1061         {
1062                 for (q = *sendq; q != NULL; q = q->q_next)
1063                 {
1064                         if (!QS_IS_DEAD(q->q_state))
1065                                 break;
1066                 }
1067                 if (q == NULL)
1068                 {
1069                         new->q_state = QS_BADADDR;
1070                         new->q_status = "5.4.6";
1071                         usrerrenh(new->q_status,
1072                                   "554 aliasing/forwarding loop broken");
1073                 }
1074         }
1075
1076   done:
1077         new->q_flags |= QTHISPASS;
1078         if (buf != buf0)
1079                 sm_free(buf); /* XXX leak if above code raises exception */
1080
1081         /*
1082         **  If we are at the top level, check to see if this has
1083         **  expanded to exactly one address.  If so, it can inherit
1084         **  the primaryness of the address.
1085         **
1086         **  While we're at it, clear the QTHISPASS bits.
1087         */
1088
1089         if (aliaslevel == 0)
1090         {
1091                 int nrcpts = 0;
1092                 ADDRESS *only = NULL;
1093
1094                 for (q = *sendq; q != NULL; q = q->q_next)
1095                 {
1096                         if (bitset(QTHISPASS, q->q_flags) &&
1097                             QS_IS_SENDABLE(q->q_state))
1098                         {
1099                                 nrcpts++;
1100                                 only = q;
1101                         }
1102                         q->q_flags &= ~QTHISPASS;
1103                 }
1104                 if (nrcpts == 1)
1105                 {
1106                         /* check to see if this actually got a new owner */
1107                         q = only;
1108                         while ((q = q->q_alias) != NULL)
1109                         {
1110                                 if (q->q_owner != NULL)
1111                                         break;
1112                         }
1113                         if (q == NULL)
1114                                 only->q_flags |= QPRIMARY;
1115                 }
1116                 else if (!initialdontsend && nrcpts > 0)
1117                 {
1118                         /* arrange for return receipt */
1119                         e->e_flags |= EF_SENDRECEIPT;
1120                         new->q_flags |= QEXPANDED;
1121                         if (e->e_xfp != NULL &&
1122                             bitset(QPINGONSUCCESS, new->q_flags))
1123                                 (void) sm_io_fprintf(e->e_xfp, SM_TIME_DEFAULT,
1124                                                      "%s... expanded to multiple addresses\n",
1125                                                      new->q_paddr);
1126                 }
1127         }
1128         new->q_flags |= QRCPTOK;
1129         (void) sm_snprintf(buf0, sizeof(buf0), "%d", e->e_nrcpts);
1130         macdefine(&e->e_macro, A_TEMP, macid("{nrcpts}"), buf0);
1131         return new;
1132 }
1133
1134 /*
1135 **  FINDUSER -- find the password entry for a user.
1136 **
1137 **      This looks a lot like getpwnam, except that it may want to
1138 **      do some fancier pattern matching in /etc/passwd.
1139 **
1140 **      This routine contains most of the time of many sendmail runs.
1141 **      It deserves to be optimized.
1142 **
1143 **      Parameters:
1144 **              name -- the name to match against.
1145 **              fuzzyp -- an outarg that is set to true if this entry
1146 **                      was found using the fuzzy matching algorithm;
1147 **                      set to false otherwise.
1148 **              user -- structure to fill in if user is found
1149 **
1150 **      Returns:
1151 **              On success, fill in *user, set *fuzzyp and return EX_OK.
1152 **              If the user was not found, return EX_NOUSER.
1153 **              On error, return EX_TEMPFAIL or EX_OSERR.
1154 **
1155 **      Side Effects:
1156 **              may modify name.
1157 */
1158
1159 int
1160 finduser(name, fuzzyp, user)
1161         char *name;
1162         bool *fuzzyp;
1163         SM_MBDB_T *user;
1164 {
1165 #if MATCHGECOS
1166         register struct passwd *pw;
1167 #endif /* MATCHGECOS */
1168         register char *p;
1169         bool tryagain;
1170         int status;
1171
1172         if (tTd(29, 4))
1173                 sm_dprintf("finduser(%s): ", name);
1174
1175         *fuzzyp = false;
1176
1177 #if HESIOD
1178         /* DEC Hesiod getpwnam accepts numeric strings -- short circuit it */
1179         for (p = name; *p != '\0'; p++)
1180                 if (!isascii(*p) || !isdigit(*p))
1181                         break;
1182         if (*p == '\0')
1183         {
1184                 if (tTd(29, 4))
1185                         sm_dprintf("failed (numeric input)\n");
1186                 return EX_NOUSER;
1187         }
1188 #endif /* HESIOD */
1189
1190         /* look up this login name using fast path */
1191         status = sm_mbdb_lookup(name, user);
1192         if (status != EX_NOUSER)
1193         {
1194                 if (tTd(29, 4))
1195                         sm_dprintf("%s (non-fuzzy)\n", sm_strexit(status));
1196                 return status;
1197         }
1198
1199         /* try mapping it to lower case */
1200         tryagain = false;
1201         for (p = name; *p != '\0'; p++)
1202         {
1203                 if (isascii(*p) && isupper(*p))
1204                 {
1205                         *p = tolower(*p);
1206                         tryagain = true;
1207                 }
1208         }
1209         if (tryagain && (status = sm_mbdb_lookup(name, user)) != EX_NOUSER)
1210         {
1211                 if (tTd(29, 4))
1212                         sm_dprintf("%s (lower case)\n", sm_strexit(status));
1213                 *fuzzyp = true;
1214                 return status;
1215         }
1216
1217 #if MATCHGECOS
1218         /* see if fuzzy matching allowed */
1219         if (!MatchGecos)
1220         {
1221                 if (tTd(29, 4))
1222                         sm_dprintf("not found (fuzzy disabled)\n");
1223                 return EX_NOUSER;
1224         }
1225
1226         /* search for a matching full name instead */
1227         for (p = name; *p != '\0'; p++)
1228         {
1229                 if (*p == (SpaceSub & 0177) || *p == '_')
1230                         *p = ' ';
1231         }
1232         (void) setpwent();
1233         while ((pw = getpwent()) != NULL)
1234         {
1235                 char buf[MAXNAME + 1];
1236
1237 # if 0
1238                 if (sm_strcasecmp(pw->pw_name, name) == 0)
1239                 {
1240                         if (tTd(29, 4))
1241                                 sm_dprintf("found (case wrapped)\n");
1242                         break;
1243                 }
1244 # endif /* 0 */
1245
1246                 sm_pwfullname(pw->pw_gecos, pw->pw_name, buf, sizeof(buf));
1247                 if (strchr(buf, ' ') != NULL && sm_strcasecmp(buf, name) == 0)
1248                 {
1249                         if (tTd(29, 4))
1250                                 sm_dprintf("fuzzy matches %s\n", pw->pw_name);
1251                         message("sending to login name %s", pw->pw_name);
1252                         break;
1253                 }
1254         }
1255         if (pw != NULL)
1256                 *fuzzyp = true;
1257         else if (tTd(29, 4))
1258                 sm_dprintf("no fuzzy match found\n");
1259 # if DEC_OSF_BROKEN_GETPWENT    /* DEC OSF/1 3.2 or earlier */
1260         endpwent();
1261 # endif /* DEC_OSF_BROKEN_GETPWENT */
1262         if (pw == NULL)
1263                 return EX_NOUSER;
1264         sm_mbdb_frompw(user, pw);
1265         return EX_OK;
1266 #else /* MATCHGECOS */
1267         if (tTd(29, 4))
1268                 sm_dprintf("not found (fuzzy disabled)\n");
1269         return EX_NOUSER;
1270 #endif /* MATCHGECOS */
1271 }
1272
1273 /*
1274 **  WRITABLE -- predicate returning if the file is writable.
1275 **
1276 **      This routine must duplicate the algorithm in sys/fio.c.
1277 **      Unfortunately, we cannot use the access call since we
1278 **      won't necessarily be the real uid when we try to
1279 **      actually open the file.
1280 **
1281 **      Notice that ANY file with ANY execute bit is automatically
1282 **      not writable.  This is also enforced by mailfile.
1283 **
1284 **      Parameters:
1285 **              filename -- the file name to check.
1286 **              ctladdr -- the controlling address for this file.
1287 **              flags -- SFF_* flags to control the function.
1288 **
1289 **      Returns:
1290 **              true -- if we will be able to write this file.
1291 **              false -- if we cannot write this file.
1292 **
1293 **      Side Effects:
1294 **              none.
1295 */
1296
1297 bool
1298 writable(filename, ctladdr, flags)
1299         char *filename;
1300         ADDRESS *ctladdr;
1301         long flags;
1302 {
1303         uid_t euid = 0;
1304         gid_t egid = 0;
1305         char *user = NULL;
1306
1307         if (tTd(44, 5))
1308                 sm_dprintf("writable(%s, 0x%lx)\n", filename, flags);
1309
1310         /*
1311         **  File does exist -- check that it is writable.
1312         */
1313
1314         if (geteuid() != 0)
1315         {
1316                 euid = geteuid();
1317                 egid = getegid();
1318                 user = NULL;
1319         }
1320         else if (ctladdr != NULL)
1321         {
1322                 euid = ctladdr->q_uid;
1323                 egid = ctladdr->q_gid;
1324                 user = ctladdr->q_user;
1325         }
1326         else if (bitset(SFF_RUNASREALUID, flags))
1327         {
1328                 euid = RealUid;
1329                 egid = RealGid;
1330                 user = RealUserName;
1331         }
1332         else if (FileMailer != NULL && !bitset(SFF_ROOTOK, flags))
1333         {
1334                 if (FileMailer->m_uid == NO_UID)
1335                 {
1336                         euid = DefUid;
1337                         user = DefUser;
1338                 }
1339                 else
1340                 {
1341                         euid = FileMailer->m_uid;
1342                         user = NULL;
1343                 }
1344                 if (FileMailer->m_gid == NO_GID)
1345                         egid = DefGid;
1346                 else
1347                         egid = FileMailer->m_gid;
1348         }
1349         else
1350         {
1351                 euid = egid = 0;
1352                 user = NULL;
1353         }
1354         if (!bitset(SFF_ROOTOK, flags))
1355         {
1356                 if (euid == 0)
1357                 {
1358                         euid = DefUid;
1359                         user = DefUser;
1360                 }
1361                 if (egid == 0)
1362                         egid = DefGid;
1363         }
1364         if (geteuid() == 0 &&
1365             (ctladdr == NULL || !bitset(QGOODUID, ctladdr->q_flags)))
1366                 flags |= SFF_SETUIDOK;
1367
1368         if (!bitnset(DBS_FILEDELIVERYTOSYMLINK, DontBlameSendmail))
1369                 flags |= SFF_NOSLINK;
1370         if (!bitnset(DBS_FILEDELIVERYTOHARDLINK, DontBlameSendmail))
1371                 flags |= SFF_NOHLINK;
1372
1373         errno = safefile(filename, euid, egid, user, flags, S_IWRITE, NULL);
1374         return errno == 0;
1375 }
1376
1377 /*
1378 **  INCLUDE -- handle :include: specification.
1379 **
1380 **      Parameters:
1381 **              fname -- filename to include.
1382 **              forwarding -- if true, we are reading a .forward file.
1383 **                      if false, it's a :include: file.
1384 **              ctladdr -- address template to use to fill in these
1385 **                      addresses -- effective user/group id are
1386 **                      the important things.
1387 **              sendq -- a pointer to the head of the send queue
1388 **                      to put these addresses in.
1389 **              aliaslevel -- the alias nesting depth.
1390 **              e -- the current envelope.
1391 **
1392 **      Returns:
1393 **              open error status
1394 **
1395 **      Side Effects:
1396 **              reads the :include: file and sends to everyone
1397 **              listed in that file.
1398 **
1399 **      Security Note:
1400 **              If you have restricted chown (that is, you can't
1401 **              give a file away), it is reasonable to allow programs
1402 **              and files called from this :include: file to be to be
1403 **              run as the owner of the :include: file.  This is bogus
1404 **              if there is any chance of someone giving away a file.
1405 **              We assume that pre-POSIX systems can give away files.
1406 **
1407 **              There is an additional restriction that if you
1408 **              forward to a :include: file, it will not take on
1409 **              the ownership of the :include: file.  This may not
1410 **              be necessary, but shouldn't hurt.
1411 */
1412
1413 static jmp_buf  CtxIncludeTimeout;
1414
1415 int
1416 include(fname, forwarding, ctladdr, sendq, aliaslevel, e)
1417         char *fname;
1418         bool forwarding;
1419         ADDRESS *ctladdr;
1420         ADDRESS **sendq;
1421         int aliaslevel;
1422         ENVELOPE *e;
1423 {
1424         SM_FILE_T *volatile fp = NULL;
1425         char *oldto = e->e_to;
1426         char *oldfilename = FileName;
1427         int oldlinenumber = LineNumber;
1428         register SM_EVENT *ev = NULL;
1429         int nincludes;
1430         int mode;
1431         volatile bool maxreached = false;
1432         register ADDRESS *ca;
1433         volatile uid_t saveduid;
1434         volatile gid_t savedgid;
1435         volatile uid_t uid;
1436         volatile gid_t gid;
1437         char *volatile user;
1438         int rval = 0;
1439         volatile long sfflags = SFF_REGONLY;
1440         register char *p;
1441         bool safechown = false;
1442         volatile bool safedir = false;
1443         struct stat st;
1444         char buf[MAXLINE];
1445
1446         if (tTd(27, 2))
1447                 sm_dprintf("include(%s)\n", fname);
1448         if (tTd(27, 4))
1449                 sm_dprintf("   ruid=%d euid=%d\n",
1450                         (int) getuid(), (int) geteuid());
1451         if (tTd(27, 14))
1452         {
1453                 sm_dprintf("ctladdr ");
1454                 printaddr(sm_debug_file(), ctladdr, false);
1455         }
1456
1457         if (tTd(27, 9))
1458                 sm_dprintf("include: old uid = %d/%d\n",
1459                            (int) getuid(), (int) geteuid());
1460
1461         if (forwarding)
1462         {
1463                 sfflags |= SFF_MUSTOWN|SFF_ROOTOK;
1464                 if (!bitnset(DBS_GROUPWRITABLEFORWARDFILE, DontBlameSendmail))
1465                         sfflags |= SFF_NOGWFILES;
1466                 if (!bitnset(DBS_WORLDWRITABLEFORWARDFILE, DontBlameSendmail))
1467                         sfflags |= SFF_NOWWFILES;
1468         }
1469         else
1470         {
1471                 if (!bitnset(DBS_GROUPWRITABLEINCLUDEFILE, DontBlameSendmail))
1472                         sfflags |= SFF_NOGWFILES;
1473                 if (!bitnset(DBS_WORLDWRITABLEINCLUDEFILE, DontBlameSendmail))
1474                         sfflags |= SFF_NOWWFILES;
1475         }
1476
1477         /*
1478         **  If RunAsUser set, won't be able to run programs as user
1479         **  so mark them as unsafe unless the administrator knows better.
1480         */
1481
1482         if ((geteuid() != 0 || RunAsUid != 0) &&
1483             !bitnset(DBS_NONROOTSAFEADDR, DontBlameSendmail))
1484         {
1485                 if (tTd(27, 4))
1486                         sm_dprintf("include: not safe (euid=%d, RunAsUid=%d)\n",
1487                                    (int) geteuid(), (int) RunAsUid);
1488                 ctladdr->q_flags |= QUNSAFEADDR;
1489         }
1490
1491         ca = getctladdr(ctladdr);
1492         if (ca == NULL ||
1493             (ca->q_uid == DefUid && ca->q_gid == 0))
1494         {
1495                 uid = DefUid;
1496                 gid = DefGid;
1497                 user = DefUser;
1498         }
1499         else
1500         {
1501                 uid = ca->q_uid;
1502                 gid = ca->q_gid;
1503                 user = ca->q_user;
1504         }
1505 #if MAILER_SETUID_METHOD != USE_SETUID
1506         saveduid = geteuid();
1507         savedgid = getegid();
1508         if (saveduid == 0)
1509         {
1510                 if (!DontInitGroups)
1511                 {
1512                         if (initgroups(user, gid) == -1)
1513                         {
1514                                 rval = EAGAIN;
1515                                 syserr("include: initgroups(%s, %d) failed",
1516                                         user, gid);
1517                                 goto resetuid;
1518                         }
1519                 }
1520                 else
1521                 {
1522                         GIDSET_T gidset[1];
1523
1524                         gidset[0] = gid;
1525                         if (setgroups(1, gidset) == -1)
1526                         {
1527                                 rval = EAGAIN;
1528                                 syserr("include: setgroups() failed");
1529                                 goto resetuid;
1530                         }
1531                 }
1532
1533                 if (gid != 0 && setgid(gid) < -1)
1534                 {
1535                         rval = EAGAIN;
1536                         syserr("setgid(%d) failure", gid);
1537                         goto resetuid;
1538                 }
1539                 if (uid != 0)
1540                 {
1541 # if MAILER_SETUID_METHOD == USE_SETEUID
1542                         if (seteuid(uid) < 0)
1543                         {
1544                                 rval = EAGAIN;
1545                                 syserr("seteuid(%d) failure (real=%d, eff=%d)",
1546                                         uid, (int) getuid(), (int) geteuid());
1547                                 goto resetuid;
1548                         }
1549 # endif /* MAILER_SETUID_METHOD == USE_SETEUID */
1550 # if MAILER_SETUID_METHOD == USE_SETREUID
1551                         if (setreuid(0, uid) < 0)
1552                         {
1553                                 rval = EAGAIN;
1554                                 syserr("setreuid(0, %d) failure (real=%d, eff=%d)",
1555                                         uid, (int) getuid(), (int) geteuid());
1556                                 goto resetuid;
1557                         }
1558 # endif /* MAILER_SETUID_METHOD == USE_SETREUID */
1559                 }
1560         }
1561 #endif /* MAILER_SETUID_METHOD != USE_SETUID */
1562
1563         if (tTd(27, 9))
1564                 sm_dprintf("include: new uid = %d/%d\n",
1565                            (int) getuid(), (int) geteuid());
1566
1567         /*
1568         **  If home directory is remote mounted but server is down,
1569         **  this can hang or give errors; use a timeout to avoid this
1570         */
1571
1572         if (setjmp(CtxIncludeTimeout) != 0)
1573         {
1574                 ctladdr->q_state = QS_QUEUEUP;
1575                 errno = 0;
1576
1577                 /* return pseudo-error code */
1578                 rval = E_SM_OPENTIMEOUT;
1579                 goto resetuid;
1580         }
1581         if (TimeOuts.to_fileopen > 0)
1582                 ev = sm_setevent(TimeOuts.to_fileopen, includetimeout, 0);
1583         else
1584                 ev = NULL;
1585
1586
1587         /* check for writable parent directory */
1588         p = strrchr(fname, '/');
1589         if (p != NULL)
1590         {
1591                 int ret;
1592
1593                 *p = '\0';
1594                 ret = safedirpath(fname, uid, gid, user,
1595                                   sfflags|SFF_SAFEDIRPATH, 0, 0);
1596                 if (ret == 0)
1597                 {
1598                         /* in safe directory: relax chown & link rules */
1599                         safedir = true;
1600                         sfflags |= SFF_NOPATHCHECK;
1601                 }
1602                 else
1603                 {
1604                         if (bitnset((forwarding ?
1605                                      DBS_FORWARDFILEINUNSAFEDIRPATH :
1606                                      DBS_INCLUDEFILEINUNSAFEDIRPATH),
1607                                     DontBlameSendmail))
1608                                 sfflags |= SFF_NOPATHCHECK;
1609                         else if (bitnset((forwarding ?
1610                                           DBS_FORWARDFILEINGROUPWRITABLEDIRPATH :
1611                                           DBS_INCLUDEFILEINGROUPWRITABLEDIRPATH),
1612                                          DontBlameSendmail) &&
1613                                  ret == E_SM_GWDIR)
1614                         {
1615                                 setbitn(DBS_GROUPWRITABLEDIRPATHSAFE,
1616                                         DontBlameSendmail);
1617                                 ret = safedirpath(fname, uid, gid, user,
1618                                                   sfflags|SFF_SAFEDIRPATH,
1619                                                   0, 0);
1620                                 clrbitn(DBS_GROUPWRITABLEDIRPATHSAFE,
1621                                         DontBlameSendmail);
1622                                 if (ret == 0)
1623                                         sfflags |= SFF_NOPATHCHECK;
1624                                 else
1625                                         sfflags |= SFF_SAFEDIRPATH;
1626                         }
1627                         else
1628                                 sfflags |= SFF_SAFEDIRPATH;
1629                         if (ret > E_PSEUDOBASE &&
1630                             !bitnset((forwarding ?
1631                                       DBS_FORWARDFILEINUNSAFEDIRPATHSAFE :
1632                                       DBS_INCLUDEFILEINUNSAFEDIRPATHSAFE),
1633                                      DontBlameSendmail))
1634                         {
1635                                 if (LogLevel > 11)
1636                                         sm_syslog(LOG_INFO, e->e_id,
1637                                                   "%s: unsafe directory path, marked unsafe",
1638                                                   shortenstring(fname, MAXSHORTSTR));
1639                                 ctladdr->q_flags |= QUNSAFEADDR;
1640                         }
1641                 }
1642                 *p = '/';
1643         }
1644
1645         /* allow links only in unwritable directories */
1646         if (!safedir &&
1647             !bitnset((forwarding ?
1648                       DBS_LINKEDFORWARDFILEINWRITABLEDIR :
1649                       DBS_LINKEDINCLUDEFILEINWRITABLEDIR),
1650                      DontBlameSendmail))
1651                 sfflags |= SFF_NOLINK;
1652
1653         rval = safefile(fname, uid, gid, user, sfflags, S_IREAD, &st);
1654         if (rval != 0)
1655         {
1656                 /* don't use this :include: file */
1657                 if (tTd(27, 4))
1658                         sm_dprintf("include: not safe (uid=%d): %s\n",
1659                                    (int) uid, sm_errstring(rval));
1660         }
1661         else if ((fp = sm_io_open(SmFtStdio, SM_TIME_DEFAULT, fname,
1662                                   SM_IO_RDONLY, NULL)) == NULL)
1663         {
1664                 rval = errno;
1665                 if (tTd(27, 4))
1666                         sm_dprintf("include: open: %s\n", sm_errstring(rval));
1667         }
1668         else if (filechanged(fname, sm_io_getinfo(fp,SM_IO_WHAT_FD, NULL), &st))
1669         {
1670                 rval = E_SM_FILECHANGE;
1671                 if (tTd(27, 4))
1672                         sm_dprintf("include: file changed after open\n");
1673         }
1674         if (ev != NULL)
1675                 sm_clrevent(ev);
1676
1677 resetuid:
1678
1679 #if HASSETREUID || USESETEUID
1680         if (saveduid == 0)
1681         {
1682                 if (uid != 0)
1683                 {
1684 # if USESETEUID
1685                         if (seteuid(0) < 0)
1686                                 syserr("!seteuid(0) failure (real=%d, eff=%d)",
1687                                        (int) getuid(), (int) geteuid());
1688 # else /* USESETEUID */
1689                         if (setreuid(-1, 0) < 0)
1690                                 syserr("!setreuid(-1, 0) failure (real=%d, eff=%d)",
1691                                        (int) getuid(), (int) geteuid());
1692                         if (setreuid(RealUid, 0) < 0)
1693                                 syserr("!setreuid(%d, 0) failure (real=%d, eff=%d)",
1694                                        (int) RealUid, (int) getuid(),
1695                                        (int) geteuid());
1696 # endif /* USESETEUID */
1697                 }
1698                 if (setgid(savedgid) < 0)
1699                         syserr("!setgid(%d) failure (real=%d eff=%d)",
1700                                (int) savedgid, (int) getgid(),
1701                                (int) getegid());
1702         }
1703 #endif /* HASSETREUID || USESETEUID */
1704
1705         if (tTd(27, 9))
1706                 sm_dprintf("include: reset uid = %d/%d\n",
1707                            (int) getuid(), (int) geteuid());
1708
1709         if (rval == E_SM_OPENTIMEOUT)
1710                 usrerr("451 4.4.1 open timeout on %s", fname);
1711
1712         if (fp == NULL)
1713                 return rval;
1714
1715         if (fstat(sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL), &st) < 0)
1716         {
1717                 rval = errno;
1718                 syserr("Cannot fstat %s!", fname);
1719                 (void) sm_io_close(fp, SM_TIME_DEFAULT);
1720                 return rval;
1721         }
1722
1723         /* if path was writable, check to avoid file giveaway tricks */
1724         safechown = chownsafe(sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL), safedir);
1725         if (tTd(27, 6))
1726                 sm_dprintf("include: parent of %s is %s, chown is %ssafe\n",
1727                            fname, safedir ? "safe" : "dangerous",
1728                            safechown ? "" : "un");
1729
1730         /* if no controlling user or coming from an alias delivery */
1731         if (safechown &&
1732             (ca == NULL ||
1733              (ca->q_uid == DefUid && ca->q_gid == 0)))
1734         {
1735                 ctladdr->q_uid = st.st_uid;
1736                 ctladdr->q_gid = st.st_gid;
1737                 ctladdr->q_flags |= QGOODUID;
1738         }
1739         if (ca != NULL && ca->q_uid == st.st_uid)
1740         {
1741                 /* optimization -- avoid getpwuid if we already have info */
1742                 ctladdr->q_flags |= ca->q_flags & QBOGUSSHELL;
1743                 ctladdr->q_ruser = ca->q_ruser;
1744         }
1745         else if (!forwarding)
1746         {
1747                 register struct passwd *pw;
1748
1749                 pw = sm_getpwuid(st.st_uid);
1750                 if (pw == NULL)
1751                 {
1752                         ctladdr->q_uid = st.st_uid;
1753                         ctladdr->q_flags |= QBOGUSSHELL;
1754                 }
1755                 else
1756                 {
1757                         char *sh;
1758
1759                         ctladdr->q_ruser = sm_rpool_strdup_x(e->e_rpool,
1760                                                              pw->pw_name);
1761                         if (safechown)
1762                                 sh = pw->pw_shell;
1763                         else
1764                                 sh = "/SENDMAIL/ANY/SHELL/";
1765                         if (!usershellok(pw->pw_name, sh))
1766                         {
1767                                 if (LogLevel > 11)
1768                                         sm_syslog(LOG_INFO, e->e_id,
1769                                                   "%s: user %s has bad shell %s, marked %s",
1770                                                   shortenstring(fname,
1771                                                                 MAXSHORTSTR),
1772                                                   pw->pw_name, sh,
1773                                                   safechown ? "bogus" : "unsafe");
1774                                 if (safechown)
1775                                         ctladdr->q_flags |= QBOGUSSHELL;
1776                                 else
1777                                         ctladdr->q_flags |= QUNSAFEADDR;
1778                         }
1779                 }
1780         }
1781
1782         if (bitset(EF_VRFYONLY, e->e_flags))
1783         {
1784                 /* don't do any more now */
1785                 ctladdr->q_state = QS_VERIFIED;
1786                 e->e_nrcpts++;
1787                 (void) sm_io_close(fp, SM_TIME_DEFAULT);
1788                 return rval;
1789         }
1790
1791         /*
1792         **  Check to see if some bad guy can write this file
1793         **
1794         **      Group write checking could be more clever, e.g.,
1795         **      guessing as to which groups are actually safe ("sys"
1796         **      may be; "user" probably is not).
1797         */
1798
1799         mode = S_IWOTH;
1800         if (!bitnset((forwarding ?
1801                       DBS_GROUPWRITABLEFORWARDFILESAFE :
1802                       DBS_GROUPWRITABLEINCLUDEFILESAFE),
1803                      DontBlameSendmail))
1804                 mode |= S_IWGRP;
1805
1806         if (bitset(mode, st.st_mode))
1807         {
1808                 if (tTd(27, 6))
1809                         sm_dprintf("include: %s is %s writable, marked unsafe\n",
1810                                    shortenstring(fname, MAXSHORTSTR),
1811                                    bitset(S_IWOTH, st.st_mode) ? "world"
1812                                                                : "group");
1813                 if (LogLevel > 11)
1814                         sm_syslog(LOG_INFO, e->e_id,
1815                                   "%s: %s writable %s file, marked unsafe",
1816                                   shortenstring(fname, MAXSHORTSTR),
1817                                   bitset(S_IWOTH, st.st_mode) ? "world" : "group",
1818                                   forwarding ? "forward" : ":include:");
1819                 ctladdr->q_flags |= QUNSAFEADDR;
1820         }
1821
1822         /* read the file -- each line is a comma-separated list. */
1823         FileName = fname;
1824         LineNumber = 0;
1825         ctladdr->q_flags &= ~QSELFREF;
1826         nincludes = 0;
1827         while (sm_io_fgets(fp, SM_TIME_DEFAULT, buf, sizeof(buf)) != NULL &&
1828                !maxreached)
1829         {
1830                 fixcrlf(buf, true);
1831                 LineNumber++;
1832                 if (buf[0] == '#' || buf[0] == '\0')
1833                         continue;
1834
1835                 /* <sp>#@# introduces a comment anywhere */
1836                 /* for Japanese character sets */
1837                 for (p = buf; (p = strchr(++p, '#')) != NULL; )
1838                 {
1839                         if (p[1] == '@' && p[2] == '#' &&
1840                             isascii(p[-1]) && isspace(p[-1]) &&
1841                             (p[3] == '\0' || (isascii(p[3]) && isspace(p[3]))))
1842                         {
1843                                 --p;
1844                                 while (p > buf && isascii(p[-1]) &&
1845                                        isspace(p[-1]))
1846                                         --p;
1847                                 p[0] = '\0';
1848                                 break;
1849                         }
1850                 }
1851                 if (buf[0] == '\0')
1852                         continue;
1853
1854                 e->e_to = NULL;
1855                 message("%s to %s",
1856                         forwarding ? "forwarding" : "sending", buf);
1857                 if (forwarding && LogLevel > 10)
1858                         sm_syslog(LOG_INFO, e->e_id,
1859                                   "forward %.200s => %s",
1860                                   oldto, shortenstring(buf, MAXSHORTSTR));
1861
1862                 nincludes += sendtolist(buf, ctladdr, sendq, aliaslevel + 1, e);
1863
1864                 if (forwarding &&
1865                     MaxForwardEntries > 0 &&
1866                     nincludes >= MaxForwardEntries)
1867                 {
1868                         /* just stop reading and processing further entries */
1869 #if 0
1870                         /* additional: (?) */
1871                         ctladdr->q_state = QS_DONTSEND;
1872 #endif /* 0 */
1873
1874                         syserr("Attempt to forward to more than %d addresses (in %s)!",
1875                                 MaxForwardEntries, fname);
1876                         maxreached = true;
1877                 }
1878         }
1879
1880         if (sm_io_error(fp) && tTd(27, 3))
1881                 sm_dprintf("include: read error: %s\n", sm_errstring(errno));
1882         if (nincludes > 0 && !bitset(QSELFREF, ctladdr->q_flags))
1883         {
1884                 if (aliaslevel <= MaxAliasRecursion ||
1885                     ctladdr->q_state != QS_BADADDR)
1886                 {
1887                         ctladdr->q_state = QS_DONTSEND;
1888                         if (tTd(27, 5))
1889                         {
1890                                 sm_dprintf("include: QS_DONTSEND ");
1891                                 printaddr(sm_debug_file(), ctladdr, false);
1892                         }
1893                 }
1894         }
1895
1896         (void) sm_io_close(fp, SM_TIME_DEFAULT);
1897         FileName = oldfilename;
1898         LineNumber = oldlinenumber;
1899         e->e_to = oldto;
1900         return rval;
1901 }
1902
1903 static void
1904 includetimeout(ignore)
1905         int ignore;
1906 {
1907         /*
1908         **  NOTE: THIS CAN BE CALLED FROM A SIGNAL HANDLER.  DO NOT ADD
1909         **      ANYTHING TO THIS ROUTINE UNLESS YOU KNOW WHAT YOU ARE
1910         **      DOING.
1911         */
1912
1913         errno = ETIMEDOUT;
1914         longjmp(CtxIncludeTimeout, 1);
1915 }
1916
1917 /*
1918 **  SENDTOARGV -- send to an argument vector.
1919 **
1920 **      Parameters:
1921 **              argv -- argument vector to send to.
1922 **              e -- the current envelope.
1923 **
1924 **      Returns:
1925 **              none.
1926 **
1927 **      Side Effects:
1928 **              puts all addresses on the argument vector onto the
1929 **                      send queue.
1930 */
1931
1932 void
1933 sendtoargv(argv, e)
1934         register char **argv;
1935         register ENVELOPE *e;
1936 {
1937         register char *p;
1938
1939         while ((p = *argv++) != NULL)
1940                 (void) sendtolist(p, NULLADDR, &e->e_sendqueue, 0, e);
1941 }
1942
1943 /*
1944 **  GETCTLADDR -- get controlling address from an address header.
1945 **
1946 **      If none, get one corresponding to the effective userid.
1947 **
1948 **      Parameters:
1949 **              a -- the address to find the controller of.
1950 **
1951 **      Returns:
1952 **              the controlling address.
1953 */
1954
1955 ADDRESS *
1956 getctladdr(a)
1957         register ADDRESS *a;
1958 {
1959         while (a != NULL && !bitset(QGOODUID, a->q_flags))
1960                 a = a->q_alias;
1961         return a;
1962 }
1963
1964 /*
1965 **  SELF_REFERENCE -- check to see if an address references itself
1966 **
1967 **      The check is done through a chain of aliases.  If it is part of
1968 **      a loop, break the loop at the "best" address, that is, the one
1969 **      that exists as a real user.
1970 **
1971 **      This is to handle the case of:
1972 **              awc:            Andrew.Chang
1973 **              Andrew.Chang:   awc@mail.server
1974 **      which is a problem only on mail.server.
1975 **
1976 **      Parameters:
1977 **              a -- the address to check.
1978 **
1979 **      Returns:
1980 **              The address that should be retained.
1981 */
1982
1983 static ADDRESS *
1984 self_reference(a)
1985         ADDRESS *a;
1986 {
1987         ADDRESS *b;             /* top entry in self ref loop */
1988         ADDRESS *c;             /* entry that point to a real mail box */
1989
1990         if (tTd(27, 1))
1991                 sm_dprintf("self_reference(%s)\n", a->q_paddr);
1992
1993         for (b = a->q_alias; b != NULL; b = b->q_alias)
1994         {
1995                 if (sameaddr(a, b))
1996                         break;
1997         }
1998
1999         if (b == NULL)
2000         {
2001                 if (tTd(27, 1))
2002                         sm_dprintf("\t... no self ref\n");
2003                 return NULL;
2004         }
2005
2006         /*
2007         **  Pick the first address that resolved to a real mail box
2008         **  i.e has a mbdb entry.  The returned value will be marked
2009         **  QSELFREF in recipient(), which in turn will disable alias()
2010         **  from marking it as QS_IS_DEAD(), which mean it will be used
2011         **  as a deliverable address.
2012         **
2013         **  The 2 key thing to note here are:
2014         **      1) we are in a recursive call sequence:
2015         **              alias->sendtolist->recipient->alias
2016         **      2) normally, when we return back to alias(), the address
2017         **         will be marked QS_EXPANDED, since alias() assumes the
2018         **         expanded form will be used instead of the current address.
2019         **         This behaviour is turned off if the address is marked
2020         **         QSELFREF.  We set QSELFREF when we return to recipient().
2021         */
2022
2023         c = a;
2024         while (c != NULL)
2025         {
2026                 if (tTd(27, 10))
2027                         sm_dprintf("  %s", c->q_user);
2028                 if (bitnset(M_HASPWENT, c->q_mailer->m_flags))
2029                 {
2030                         SM_MBDB_T user;
2031
2032                         if (tTd(27, 2))
2033                                 sm_dprintf("\t... getpwnam(%s)... ", c->q_user);
2034                         if (sm_mbdb_lookup(c->q_user, &user) == EX_OK)
2035                         {
2036                                 if (tTd(27, 2))
2037                                         sm_dprintf("found\n");
2038
2039                                 /* ought to cache results here */
2040                                 if (sameaddr(b, c))
2041                                         return b;
2042                                 else
2043                                         return c;
2044                         }
2045                         if (tTd(27, 2))
2046                                 sm_dprintf("failed\n");
2047                 }
2048                 else
2049                 {
2050                         /* if local delivery, compare usernames */
2051                         if (bitnset(M_LOCALMAILER, c->q_mailer->m_flags) &&
2052                             b->q_mailer == c->q_mailer)
2053                         {
2054                                 if (tTd(27, 2))
2055                                         sm_dprintf("\t... local match (%s)\n",
2056                                                 c->q_user);
2057                                 if (sameaddr(b, c))
2058                                         return b;
2059                                 else
2060                                         return c;
2061                         }
2062                 }
2063                 if (tTd(27, 10))
2064                         sm_dprintf("\n");
2065                 c = c->q_alias;
2066         }
2067
2068         if (tTd(27, 1))
2069                 sm_dprintf("\t... cannot break loop for \"%s\"\n", a->q_paddr);
2070
2071         return NULL;
2072 }