contrib/sendmail/src/mci.c

   1 /*
   2  * Copyright (c) 1998-2003 Sendmail, Inc. and its suppliers.
   3  *      All rights reserved.
   4  * Copyright (c) 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  * $FreeBSD: src/contrib/sendmail/src/mci.c,v 1.3.6.12 2003/10/30 22:31:44 gshapiro Exp $
  13  */
  14
  15 #include <sendmail.h>
  16
  17 SM_RCSID("@(#)$Id: mci.c,v 8.205.2.4 2003/03/31 17:35:27 ca Exp $")
  18
  19 #if NETINET || NETINET6
  20 # include <arpa/inet.h>
  21 #endif /* NETINET || NETINET6 */
  22
  23 #include <dirent.h>
  24
  25 static int      mci_generate_persistent_path __P((const char *, char *,
  26                                                   int, bool));
  27 static bool     mci_load_persistent __P((MCI *));
  28 static void     mci_uncache __P((MCI **, bool));
  29 static int      mci_lock_host_statfile __P((MCI *));
  30 static int      mci_read_persistent __P((SM_FILE_T *, MCI *));
  31
  32 /*
  33 **  Mail Connection Information (MCI) Caching Module.
  34 **
  35 **      There are actually two separate things cached.  The first is
  36 **      the set of all open connections -- these are stored in a
  37 **      (small) list.  The second is stored in the symbol table; it
  38 **      has the overall status for all hosts, whether or not there
  39 **      is a connection open currently.
  40 **
  41 **      There should never be too many connections open (since this
  42 **      could flood the socket table), nor should a connection be
  43 **      allowed to sit idly for too long.
  44 **
  45 **      MaxMciCache is the maximum number of open connections that
  46 **      will be supported.
  47 **
  48 **      MciCacheTimeout is the time (in seconds) that a connection
  49 **      is permitted to survive without activity.
  50 **
  51 **      We actually try any cached connections by sending a NOOP
  52 **      before we use them; if the NOOP fails we close down the
  53 **      connection and reopen it.  Note that this means that a
  54 **      server SMTP that doesn't support NOOP will hose the
  55 **      algorithm -- but that doesn't seem too likely.
  56 **
  57 **      The persistent MCI code is donated by Mark Lovell and Paul
  58 **      Vixie.  It is based on the long term host status code in KJS
  59 **      written by Paul but has been adapted by Mark to fit into the
  60 **      MCI structure.
  61 */
  62
  63 static MCI      **MciCache;             /* the open connection cache */
  64
  65 /*
  66 **  MCI_CACHE -- enter a connection structure into the open connection cache
  67 **
  68 **      This may cause something else to be flushed.
  69 **
  70 **      Parameters:
  71 **              mci -- the connection to cache.
  72 **
  73 **      Returns:
  74 **              none.
  75 */
  76
  77 void
  78 mci_cache(mci)
  79         register MCI *mci;
  80 {
  81         register MCI **mcislot;
  82
  83         /*
  84         **  Find the best slot.  This may cause expired connections
  85         **  to be closed.
  86         */
  87
  88         mcislot = mci_scan(mci);
  89         if (mcislot == NULL)
  90         {
  91                 /* we don't support caching */
  92                 return;
  93         }
  94
  95         if (mci->mci_host == NULL)
  96                 return;
  97
  98         /* if this is already cached, we are done */
  99         if (bitset(MCIF_CACHED, mci->mci_flags))
 100                 return;
 101
 102         /* otherwise we may have to clear the slot */
 103         if (*mcislot != NULL)
 104                 mci_uncache(mcislot, true);
 105
 106         if (tTd(42, 5))
 107                 sm_dprintf("mci_cache: caching %p (%s) in slot %d\n",
 108                            mci, mci->mci_host, (int) (mcislot - MciCache));
 109         if (tTd(91, 100))
 110                 sm_syslog(LOG_DEBUG, CurEnv->e_id,
 111                           "mci_cache: caching %lx (%.100s) in slot %d",
 112                           (unsigned long) mci, mci->mci_host,
 113                           (int) (mcislot - MciCache));
 114
 115         *mcislot = mci;
 116         mci->mci_flags |= MCIF_CACHED;
 117 }
 118 /*
 119 **  MCI_SCAN -- scan the cache, flush junk, and return best slot
 120 **
 121 **      Parameters:
 122 **              savemci -- never flush this one.  Can be null.
 123 **
 124 **      Returns:
 125 **              The LRU (or empty) slot.
 126 */
 127
 128 MCI **
 129 mci_scan(savemci)
 130         MCI *savemci;
 131 {
 132         time_t now;
 133         register MCI **bestmci;
 134         register MCI *mci;
 135         register int i;
 136
 137         if (MaxMciCache <= 0)
 138         {
 139                 /* we don't support caching */
 140                 return NULL;
 141         }
 142
 143         if (MciCache == NULL)
 144         {
 145                 /* first call */
 146                 MciCache = (MCI **) sm_pmalloc_x(MaxMciCache * sizeof *MciCache);
 147                 memset((char *) MciCache, '\0', MaxMciCache * sizeof *MciCache);
 148                 return &MciCache[0];
 149         }
 150
 151         now = curtime();
 152         bestmci = &MciCache[0];
 153         for (i = 0; i < MaxMciCache; i++)
 154         {
 155                 mci = MciCache[i];
 156                 if (mci == NULL || mci->mci_state == MCIS_CLOSED)
 157                 {
 158                         bestmci = &MciCache[i];
 159                         continue;
 160                 }
 161                 if ((mci->mci_lastuse + MciCacheTimeout <= now ||
 162                      (mci->mci_mailer != NULL &&
 163                       mci->mci_mailer->m_maxdeliveries > 0 &&
 164                       mci->mci_deliveries + 1 >= mci->mci_mailer->m_maxdeliveries))&&
 165                     mci != savemci)
 166                 {
 167                         /* connection idle too long or too many deliveries */
 168                         bestmci = &MciCache[i];
 169
 170                         /* close it */
 171                         mci_uncache(bestmci, true);
 172                         continue;
 173                 }
 174                 if (*bestmci == NULL)
 175                         continue;
 176                 if (mci->mci_lastuse < (*bestmci)->mci_lastuse)
 177                         bestmci = &MciCache[i];
 178         }
 179         return bestmci;
 180 }
 181 /*
 182 **  MCI_UNCACHE -- remove a connection from a slot.
 183 **
 184 **      May close a connection.
 185 **
 186 **      Parameters:
 187 **              mcislot -- the slot to empty.
 188 **              doquit -- if true, send QUIT protocol on this connection.
 189 **                        if false, we are assumed to be in a forked child;
 190 **                              all we want to do is close the file(s).
 191 **
 192 **      Returns:
 193 **              none.
 194 */
 195
 196 static void
 197 mci_uncache(mcislot, doquit)
 198         register MCI **mcislot;
 199         bool doquit;
 200 {
 201         register MCI *mci;
 202         extern ENVELOPE BlankEnvelope;
 203
 204         mci = *mcislot;
 205         if (mci == NULL)
 206                 return;
 207         *mcislot = NULL;
 208         if (mci->mci_host == NULL)
 209                 return;
 210
 211         mci_unlock_host(mci);
 212
 213         if (tTd(42, 5))
 214                 sm_dprintf("mci_uncache: uncaching %p (%s) from slot %d (%d)\n",
 215                            mci, mci->mci_host, (int) (mcislot - MciCache),
 216                            doquit);
 217         if (tTd(91, 100))
 218                 sm_syslog(LOG_DEBUG, CurEnv->e_id,
 219                           "mci_uncache: uncaching %lx (%.100s) from slot %d (%d)",
 220                           (unsigned long) mci, mci->mci_host,
 221                           (int) (mcislot - MciCache), doquit);
 222
 223         mci->mci_deliveries = 0;
 224         if (doquit)
 225         {
 226                 message("Closing connection to %s", mci->mci_host);
 227
 228                 mci->mci_flags &= ~MCIF_CACHED;
 229
 230                 /* only uses the envelope to flush the transcript file */
 231                 if (mci->mci_state != MCIS_CLOSED)
 232                         smtpquit(mci->mci_mailer, mci, &BlankEnvelope);
 233 #if XLA
 234                 xla_host_end(mci->mci_host);
 235 #endif /* XLA */
 236         }
 237         else
 238         {
 239                 if (mci->mci_in != NULL)
 240                         (void) sm_io_close(mci->mci_in, SM_TIME_DEFAULT);
 241                 if (mci->mci_out != NULL)
 242                         (void) sm_io_close(mci->mci_out, SM_TIME_DEFAULT);
 243                 mci->mci_in = mci->mci_out = NULL;
 244                 mci->mci_state = MCIS_CLOSED;
 245                 mci->mci_exitstat = EX_OK;
 246                 mci->mci_errno = 0;
 247                 mci->mci_flags = 0;
 248
 249                 mci->mci_retryrcpt = false;
 250                 mci->mci_tolist = NULL;
 251 #if PIPELINING
 252                 mci->mci_okrcpts = 0;
 253 #endif /* PIPELINING */
 254         }
 255
 256         SM_FREE_CLR(mci->mci_status);
 257         SM_FREE_CLR(mci->mci_rstatus);
 258         SM_FREE_CLR(mci->mci_heloname);
 259         if (mci->mci_rpool != NULL)
 260         {
 261                 sm_rpool_free(mci->mci_rpool);
 262                 mci->mci_macro.mac_rpool = NULL;
 263                 mci->mci_rpool = NULL;
 264         }
 265 }
 266 /*
 267 **  MCI_FLUSH -- flush the entire cache
 268 **
 269 **      Parameters:
 270 **              doquit -- if true, send QUIT protocol.
 271 **                        if false, just close the connection.
 272 **              allbut -- but leave this one open.
 273 **
 274 **      Returns:
 275 **              none.
 276 */
 277
 278 void
 279 mci_flush(doquit, allbut)
 280         bool doquit;
 281         MCI *allbut;
 282 {
 283         register int i;
 284
 285         if (MciCache == NULL)
 286                 return;
 287
 288         for (i = 0; i < MaxMciCache; i++)
 289         {
 290                 if (allbut != MciCache[i])
 291                         mci_uncache(&MciCache[i], doquit);
 292         }
 293 }
 294 /*
 295 **  MCI_GET -- get information about a particular host
 296 **
 297 **      Parameters:
 298 **              host -- host to look for.
 299 **              m -- mailer.
 300 **
 301 **      Returns:
 302 **              mci for this host (might be new).
 303 */
 304
 305 MCI *
 306 mci_get(host, m)
 307         char *host;
 308         MAILER *m;
 309 {
 310         register MCI *mci;
 311         register STAB *s;
 312         extern SOCKADDR CurHostAddr;
 313
 314         /* clear CurHostAddr so we don't get a bogus address with this name */
 315         memset(&CurHostAddr, '\0', sizeof CurHostAddr);
 316
 317         /* clear out any expired connections */
 318         (void) mci_scan(NULL);
 319
 320         if (m->m_mno < 0)
 321                 syserr("!negative mno %d (%s)", m->m_mno, m->m_name);
 322
 323         s = stab(host, ST_MCI + m->m_mno, ST_ENTER);
 324         mci = &s->s_mci;
 325
 326         /* initialize per-message data */
 327         mci->mci_retryrcpt = false;
 328         mci->mci_tolist = NULL;
 329 #if PIPELINING
 330         mci->mci_okrcpts = 0;
 331 #endif /* PIPELINING */
 332
 333         if (mci->mci_rpool == NULL)
 334                 mci->mci_rpool = sm_rpool_new_x(NULL);
 335
 336         if (mci->mci_macro.mac_rpool == NULL)
 337                 mci->mci_macro.mac_rpool = mci->mci_rpool;
 338
 339         /*
 340         **  We don't need to load the persistent data if we have data
 341         **  already loaded in the cache.
 342         */
 343
 344         if (mci->mci_host == NULL &&
 345             (mci->mci_host = s->s_name) != NULL &&
 346             !mci_load_persistent(mci))
 347         {
 348                 if (tTd(42, 2))
 349                         sm_dprintf("mci_get(%s %s): lock failed\n",
 350                                 host, m->m_name);
 351                 mci->mci_exitstat = EX_TEMPFAIL;
 352                 mci->mci_state = MCIS_CLOSED;
 353                 mci->mci_statfile = NULL;
 354                 return mci;
 355         }
 356
 357         if (tTd(42, 2))
 358         {
 359                 sm_dprintf("mci_get(%s %s): mci_state=%d, _flags=%lx, _exitstat=%d, _errno=%d\n",
 360                         host, m->m_name, mci->mci_state, mci->mci_flags,
 361                         mci->mci_exitstat, mci->mci_errno);
 362         }
 363
 364         if (mci->mci_state == MCIS_OPEN)
 365         {
 366                 /* poke the connection to see if it's still alive */
 367                 (void) smtpprobe(mci);
 368
 369                 /* reset the stored state in the event of a timeout */
 370                 if (mci->mci_state != MCIS_OPEN)
 371                 {
 372                         mci->mci_errno = 0;
 373                         mci->mci_exitstat = EX_OK;
 374                         mci->mci_state = MCIS_CLOSED;
 375                 }
 376                 else
 377                 {
 378                         /* get peer host address */
 379                         /* (this should really be in the mci struct) */
 380                         SOCKADDR_LEN_T socklen = sizeof CurHostAddr;
 381
 382                         (void) getpeername(sm_io_getinfo(mci->mci_in,
 383                                                          SM_IO_WHAT_FD, NULL),
 384                                 (struct sockaddr *) &CurHostAddr, &socklen);
 385                 }
 386         }
 387         if (mci->mci_state == MCIS_CLOSED)
 388         {
 389                 time_t now = curtime();
 390
 391                 /* if this info is stale, ignore it */
 392                 if (mci->mci_lastuse + MciInfoTimeout <= now)
 393                 {
 394                         mci->mci_lastuse = now;
 395                         mci->mci_errno = 0;
 396                         mci->mci_exitstat = EX_OK;
 397                 }
 398         }
 399
 400         return mci;
 401 }
 402 /*
 403 **  MCI_NEW -- allocate new MCI structure
 404 **
 405 **      Parameters:
 406 **              rpool -- if non-NULL: allocate from that rpool.
 407 **
 408 **      Returns:
 409 **              mci (new).
 410 */
 411
 412 MCI *
 413 mci_new(rpool)
 414         SM_RPOOL_T *rpool;
 415 {
 416         register MCI *mci;
 417
 418         if (rpool == NULL)
 419                 mci = (MCI *) sm_malloc_x(sizeof *mci);
 420         else
 421                 mci = (MCI *) sm_rpool_malloc_x(rpool, sizeof *mci);
 422         memset((char *) mci, '\0', sizeof *mci);
 423         mci->mci_rpool = sm_rpool_new_x(NULL);
 424         mci->mci_macro.mac_rpool = mci->mci_rpool;
 425         return mci;
 426 }
 427 /*
 428 **  MCI_MATCH -- check connection cache for a particular host
 429 **
 430 **      Parameters:
 431 **              host -- host to look for.
 432 **              m -- mailer.
 433 **
 434 **      Returns:
 435 **              true iff open connection exists.
 436 */
 437
 438 bool
 439 mci_match(host, m)
 440         char *host;
 441         MAILER *m;
 442 {
 443         register MCI *mci;
 444         register STAB *s;
 445
 446         if (m->m_mno < 0 || m->m_mno > MAXMAILERS)
 447                 return false;
 448         s = stab(host, ST_MCI + m->m_mno, ST_FIND);
 449         if (s == NULL)
 450                 return false;
 451
 452         mci = &s->s_mci;
 453         return mci->mci_state == MCIS_OPEN;
 454 }
 455 /*
 456 **  MCI_SETSTAT -- set status codes in MCI structure.
 457 **
 458 **      Parameters:
 459 **              mci -- the MCI structure to set.
 460 **              xstat -- the exit status code.
 461 **              dstat -- the DSN status code.
 462 **              rstat -- the SMTP status code.
 463 **
 464 **      Returns:
 465 **              none.
 466 */
 467
 468 void
 469 mci_setstat(mci, xstat, dstat, rstat)
 470         MCI *mci;
 471         int xstat;
 472         char *dstat;
 473         char *rstat;
 474 {
 475         /* protocol errors should never be interpreted as sticky */
 476         if (xstat != EX_NOTSTICKY && xstat != EX_PROTOCOL)
 477                 mci->mci_exitstat = xstat;
 478
 479         SM_FREE_CLR(mci->mci_status);
 480         if (dstat != NULL)
 481                 mci->mci_status = sm_strdup_x(dstat);
 482
 483         SM_FREE_CLR(mci->mci_rstatus);
 484         if (rstat != NULL)
 485                 mci->mci_rstatus = sm_strdup_x(rstat);
 486 }
 487 /*
 488 **  MCI_DUMP -- dump the contents of an MCI structure.
 489 **
 490 **      Parameters:
 491 **              mci -- the MCI structure to dump.
 492 **
 493 **      Returns:
 494 **              none.
 495 **
 496 **      Side Effects:
 497 **              none.
 498 */
 499
 500 struct mcifbits
 501 {
 502         int     mcif_bit;       /* flag bit */
 503         char    *mcif_name;     /* flag name */
 504 };
 505 static struct mcifbits  MciFlags[] =
 506 {
 507         { MCIF_VALID,           "VALID"         },
 508         { MCIF_CACHED,          "CACHED"        },
 509         { MCIF_ESMTP,           "ESMTP"         },
 510         { MCIF_EXPN,            "EXPN"          },
 511         { MCIF_SIZE,            "SIZE"          },
 512         { MCIF_8BITMIME,        "8BITMIME"      },
 513         { MCIF_7BIT,            "7BIT"          },
 514         { MCIF_INHEADER,        "INHEADER"      },
 515         { MCIF_CVT8TO7,         "CVT8TO7"       },
 516         { MCIF_DSN,             "DSN"           },
 517         { MCIF_8BITOK,          "8BITOK"        },
 518         { MCIF_CVT7TO8,         "CVT7TO8"       },
 519         { MCIF_INMIME,          "INMIME"        },
 520         { MCIF_AUTH,            "AUTH"          },
 521         { MCIF_AUTHACT,         "AUTHACT"       },
 522         { MCIF_ENHSTAT,         "ENHSTAT"       },
 523         { MCIF_PIPELINED,       "PIPELINED"     },
 524 #if STARTTLS
 525         { MCIF_TLS,             "TLS"           },
 526         { MCIF_TLSACT,          "TLSACT"        },
 527 #endif /* STARTTLS */
 528         { MCIF_DLVR_BY,         "DLVR_BY"       },
 529         { 0,                    NULL            }
 530 };
 531
 532 void
 533 mci_dump(mci, logit)
 534         register MCI *mci;
 535         bool logit;
 536 {
 537         register char *p;
 538         char *sep;
 539         char buf[4000];
 540
 541         sep = logit ? " " : "\n\t";
 542         p = buf;
 543         (void) sm_snprintf(p, SPACELEFT(buf, p), "MCI@%p: ", mci);
 544         p += strlen(p);
 545         if (mci == NULL)
 546         {
 547                 (void) sm_snprintf(p, SPACELEFT(buf, p), "NULL");
 548                 goto printit;
 549         }
 550         (void) sm_snprintf(p, SPACELEFT(buf, p), "flags=%lx", mci->mci_flags);
 551         p += strlen(p);
 552
 553         /*
 554         **  The following check is just for paranoia.  It protects the
 555         **  assignment in the if() clause. If there's not some minimum
 556         **  amount of space we can stop right now. The check will not
 557         **  trigger as long as sizeof(buf)=4000.
 558         */
 559
 560         if (p >= buf + sizeof(buf) - 4)
 561                 goto printit;
 562         if (mci->mci_flags != 0)
 563         {
 564                 struct mcifbits *f;
 565
 566                 *p++ = '<';     /* protected above */
 567                 for (f = MciFlags; f->mcif_bit != 0; f++)
 568                 {
 569                         if (!bitset(f->mcif_bit, mci->mci_flags))
 570                                 continue;
 571                         (void) sm_strlcpyn(p, SPACELEFT(buf, p), 2,
 572                                            f->mcif_name, ",");
 573                         p += strlen(p);
 574                 }
 575                 p[-1] = '>';
 576         }
 577
 578         /* Note: sm_snprintf() takes care of NULL arguments for %s */
 579         (void) sm_snprintf(p, SPACELEFT(buf, p),
 580                 ",%serrno=%d, herrno=%d, exitstat=%d, state=%d, pid=%d,%s",
 581                 sep, mci->mci_errno, mci->mci_herrno,
 582                 mci->mci_exitstat, mci->mci_state, (int) mci->mci_pid, sep);
 583         p += strlen(p);
 584         (void) sm_snprintf(p, SPACELEFT(buf, p),
 585                 "maxsize=%ld, phase=%s, mailer=%s,%s",
 586                 mci->mci_maxsize, mci->mci_phase,
 587                 mci->mci_mailer == NULL ? "NULL" : mci->mci_mailer->m_name,
 588                 sep);
 589         p += strlen(p);
 590         (void) sm_snprintf(p, SPACELEFT(buf, p),
 591                 "status=%s, rstatus=%s,%s",
 592                 mci->mci_status, mci->mci_rstatus, sep);
 593         p += strlen(p);
 594         (void) sm_snprintf(p, SPACELEFT(buf, p),
 595                 "host=%s, lastuse=%s",
 596                 mci->mci_host, ctime(&mci->mci_lastuse));
 597 printit:
 598         if (logit)
 599                 sm_syslog(LOG_DEBUG, CurEnv->e_id, "%.1000s", buf);
 600         else
 601                 (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT, "%s\n", buf);
 602 }
 603 /*
 604 **  MCI_DUMP_ALL -- print the entire MCI cache
 605 **
 606 **      Parameters:
 607 **              logit -- if set, log the result instead of printing
 608 **                      to stdout.
 609 **
 610 **      Returns:
 611 **              none.
 612 */
 613
 614 void
 615 mci_dump_all(logit)
 616         bool logit;
 617 {
 618         register int i;
 619
 620         if (MciCache == NULL)
 621                 return;
 622
 623         for (i = 0; i < MaxMciCache; i++)
 624                 mci_dump(MciCache[i], logit);
 625 }
 626 /*
 627 **  MCI_LOCK_HOST -- Lock host while sending.
 628 **
 629 **      If we are contacting a host, we'll need to
 630 **      update the status information in the host status
 631 **      file, and if we want to do that, we ought to have
 632 **      locked it. This has the (according to some)
 633 **      desirable effect of serializing connectivity with
 634 **      remote hosts -- i.e.: one connection to a given
 635 **      host at a time.
 636 **
 637 **      Parameters:
 638 **              mci -- containing the host we want to lock.
 639 **
 640 **      Returns:
 641 **              EX_OK       -- got the lock.
 642 **              EX_TEMPFAIL -- didn't get the lock.
 643 */
 644
 645 int
 646 mci_lock_host(mci)
 647         MCI *mci;
 648 {
 649         if (mci == NULL)
 650         {
 651                 if (tTd(56, 1))
 652                         sm_dprintf("mci_lock_host: NULL mci\n");
 653                 return EX_OK;
 654         }
 655
 656         if (!SingleThreadDelivery)
 657                 return EX_OK;
 658
 659         return mci_lock_host_statfile(mci);
 660 }
 661
 662 static int
 663 mci_lock_host_statfile(mci)
 664         MCI *mci;
 665 {
 666         int save_errno = errno;
 667         int retVal = EX_OK;
 668         char fname[MAXPATHLEN];
 669
 670         if (HostStatDir == NULL || mci->mci_host == NULL)
 671                 return EX_OK;
 672
 673         if (tTd(56, 2))
 674                 sm_dprintf("mci_lock_host: attempting to lock %s\n",
 675                            mci->mci_host);
 676
 677         if (mci_generate_persistent_path(mci->mci_host, fname, sizeof fname,
 678                                          true) < 0)
 679         {
 680                 /* of course this should never happen */
 681                 if (tTd(56, 2))
 682                         sm_dprintf("mci_lock_host: Failed to generate host path for %s\n",
 683                                    mci->mci_host);
 684
 685                 retVal = EX_TEMPFAIL;
 686                 goto cleanup;
 687         }
 688
 689         mci->mci_statfile = safefopen(fname, O_RDWR, FileMode,
 690                                       SFF_NOLOCK|SFF_NOLINK|SFF_OPENASROOT|SFF_REGONLY|SFF_SAFEDIRPATH|SFF_CREAT);
 691
 692         if (mci->mci_statfile == NULL)
 693         {
 694                 syserr("mci_lock_host: cannot create host lock file %s", fname);
 695                 goto cleanup;
 696         }
 697
 698         if (!lockfile(sm_io_getinfo(mci->mci_statfile, SM_IO_WHAT_FD, NULL),
 699                       fname, "", LOCK_EX|LOCK_NB))
 700         {
 701                 if (tTd(56, 2))
 702                         sm_dprintf("mci_lock_host: couldn't get lock on %s\n",
 703                                 fname);
 704                 (void) sm_io_close(mci->mci_statfile, SM_TIME_DEFAULT);
 705                 mci->mci_statfile = NULL;
 706                 retVal = EX_TEMPFAIL;
 707                 goto cleanup;
 708         }
 709
 710         if (tTd(56, 12) && mci->mci_statfile != NULL)
 711                 sm_dprintf("mci_lock_host: Sanity check -- lock is good\n");
 712
 713 cleanup:
 714         errno = save_errno;
 715         return retVal;
 716 }
 717 /*
 718 **  MCI_UNLOCK_HOST -- unlock host
 719 **
 720 **      Clean up the lock on a host, close the file, let
 721 **      someone else use it.
 722 **
 723 **      Parameters:
 724 **              mci -- us.
 725 **
 726 **      Returns:
 727 **              nothing.
 728 */
 729
 730 void
 731 mci_unlock_host(mci)
 732         MCI *mci;
 733 {
 734         int save_errno = errno;
 735
 736         if (mci == NULL)
 737         {
 738                 if (tTd(56, 1))
 739                         sm_dprintf("mci_unlock_host: NULL mci\n");
 740                 return;
 741         }
 742
 743         if (HostStatDir == NULL || mci->mci_host == NULL)
 744                 return;
 745
 746         if (!SingleThreadDelivery && mci_lock_host_statfile(mci) == EX_TEMPFAIL)
 747         {
 748                 if (tTd(56, 1))
 749                         sm_dprintf("mci_unlock_host: stat file already locked\n");
 750         }
 751         else
 752         {
 753                 if (tTd(56, 2))
 754                         sm_dprintf("mci_unlock_host: store prior to unlock\n");
 755                 mci_store_persistent(mci);
 756         }
 757
 758         if (mci->mci_statfile != NULL)
 759         {
 760                 (void) sm_io_close(mci->mci_statfile, SM_TIME_DEFAULT);
 761                 mci->mci_statfile = NULL;
 762         }
 763
 764         errno = save_errno;
 765 }
 766 /*
 767 **  MCI_LOAD_PERSISTENT -- load persistent host info
 768 **
 769 **      Load information about host that is kept
 770 **      in common for all running sendmails.
 771 **
 772 **      Parameters:
 773 **              mci -- the host/connection to load persistent info for.
 774 **
 775 **      Returns:
 776 **              true -- lock was successful
 777 **              false -- lock failed
 778 */
 779
 780 static bool
 781 mci_load_persistent(mci)
 782         MCI *mci;
 783 {
 784         int save_errno = errno;
 785         bool locked = true;
 786         SM_FILE_T *fp;
 787         char fname[MAXPATHLEN];
 788
 789         if (mci == NULL)
 790         {
 791                 if (tTd(56, 1))
 792                         sm_dprintf("mci_load_persistent: NULL mci\n");
 793                 return true;
 794         }
 795
 796         if (IgnoreHostStatus || HostStatDir == NULL || mci->mci_host == NULL)
 797                 return true;
 798
 799         /* Already have the persistent information in memory */
 800         if (SingleThreadDelivery && mci->mci_statfile != NULL)
 801                 return true;
 802
 803         if (tTd(56, 1))
 804                 sm_dprintf("mci_load_persistent: Attempting to load persistent information for %s\n",
 805                            mci->mci_host);
 806
 807         if (mci_generate_persistent_path(mci->mci_host, fname, sizeof fname,
 808                                          false) < 0)
 809         {
 810                 /* Not much we can do if the file isn't there... */
 811                 if (tTd(56, 1))
 812                         sm_dprintf("mci_load_persistent: Couldn't generate host path\n");
 813                 goto cleanup;
 814         }
 815
 816         fp = safefopen(fname, O_RDONLY, FileMode,
 817                        SFF_NOLOCK|SFF_NOLINK|SFF_OPENASROOT|SFF_REGONLY|SFF_SAFEDIRPATH);
 818         if (fp == NULL)
 819         {
 820                 /* I can't think of any reason this should ever happen */
 821                 if (tTd(56, 1))
 822                         sm_dprintf("mci_load_persistent: open(%s): %s\n",
 823                                 fname, sm_errstring(errno));
 824                 goto cleanup;
 825         }
 826
 827         FileName = fname;
 828         locked = lockfile(sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL), fname, "",
 829                           LOCK_SH|LOCK_NB);
 830         if (locked)
 831         {
 832                 (void) mci_read_persistent(fp, mci);
 833                 (void) lockfile(sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL), fname,
 834                                 "", LOCK_UN);
 835         }
 836         FileName = NULL;
 837         (void) sm_io_close(fp, SM_TIME_DEFAULT);
 838
 839 cleanup:
 840         errno = save_errno;
 841         return locked;
 842 }
 843 /*
 844 **  MCI_READ_PERSISTENT -- read persistent host status file
 845 **
 846 **      Parameters:
 847 **              fp -- the file pointer to read.
 848 **              mci -- the pointer to fill in.
 849 **
 850 **      Returns:
 851 **              -1 -- if the file was corrupt.
 852 **              0 -- otherwise.
 853 **
 854 **      Warning:
 855 **              This code makes the assumption that this data
 856 **              will be read in an atomic fashion, and that the data
 857 **              was written in an atomic fashion.  Any other functioning
 858 **              may lead to some form of insanity.  This should be
 859 **              perfectly safe due to underlying stdio buffering.
 860 */
 861
 862 static int
 863 mci_read_persistent(fp, mci)
 864         SM_FILE_T *fp;
 865         register MCI *mci;
 866 {
 867         int ver;
 868         register char *p;
 869         int saveLineNumber = LineNumber;
 870         char buf[MAXLINE];
 871
 872         if (fp == NULL)
 873                 syserr("mci_read_persistent: NULL fp");
 874         if (mci == NULL)
 875                 syserr("mci_read_persistent: NULL mci");
 876         if (tTd(56, 93))
 877         {
 878                 sm_dprintf("mci_read_persistent: fp=%lx, mci=",
 879                            (unsigned long) fp);
 880         }
 881
 882         SM_FREE_CLR(mci->mci_status);
 883         SM_FREE_CLR(mci->mci_rstatus);
 884
 885         sm_io_rewind(fp, SM_TIME_DEFAULT);
 886         ver = -1;
 887         LineNumber = 0;
 888         while (sm_io_fgets(fp, SM_TIME_DEFAULT, buf, sizeof buf) != NULL)
 889         {
 890                 LineNumber++;
 891                 p = strchr(buf, '\n');
 892                 if (p != NULL)
 893                         *p = '\0';
 894                 switch (buf[0])
 895                 {
 896                   case 'V':             /* version stamp */
 897                         ver = atoi(&buf[1]);
 898                         if (ver < 0 || ver > 0)
 899                                 syserr("Unknown host status version %d: %d max",
 900                                         ver, 0);
 901                         break;
 902
 903                   case 'E':             /* UNIX error number */
 904                         mci->mci_errno = atoi(&buf[1]);
 905                         break;
 906
 907                   case 'H':             /* DNS error number */
 908                         mci->mci_herrno = atoi(&buf[1]);
 909                         break;
 910
 911                   case 'S':             /* UNIX exit status */
 912                         mci->mci_exitstat = atoi(&buf[1]);
 913                         break;
 914
 915                   case 'D':             /* DSN status */
 916                         mci->mci_status = newstr(&buf[1]);
 917                         break;
 918
 919                   case 'R':             /* SMTP status */
 920                         mci->mci_rstatus = newstr(&buf[1]);
 921                         break;
 922
 923                   case 'U':             /* last usage time */
 924                         mci->mci_lastuse = atol(&buf[1]);
 925                         break;
 926
 927                   case '.':             /* end of file */
 928                         if (tTd(56, 93))
 929                                 mci_dump(mci, false);
 930                         return 0;
 931
 932                   default:
 933                         sm_syslog(LOG_CRIT, NOQID,
 934                                   "%s: line %d: Unknown host status line \"%s\"",
 935                                   FileName == NULL ? mci->mci_host : FileName,
 936                                   LineNumber, buf);
 937                         LineNumber = saveLineNumber;
 938                         return -1;
 939                 }
 940         }
 941         LineNumber = saveLineNumber;
 942         if (tTd(56, 93))
 943                 sm_dprintf("incomplete (missing dot for EOF)\n");
 944         if (ver < 0)
 945                 return -1;
 946         return 0;
 947 }
 948 /*
 949 **  MCI_STORE_PERSISTENT -- Store persistent MCI information
 950 **
 951 **      Store information about host that is kept
 952 **      in common for all running sendmails.
 953 **
 954 **      Parameters:
 955 **              mci -- the host/connection to store persistent info for.
 956 **
 957 **      Returns:
 958 **              none.
 959 */
 960
 961 void
 962 mci_store_persistent(mci)
 963         MCI *mci;
 964 {
 965         int save_errno = errno;
 966
 967         if (mci == NULL)
 968         {
 969                 if (tTd(56, 1))
 970                         sm_dprintf("mci_store_persistent: NULL mci\n");
 971                 return;
 972         }
 973
 974         if (HostStatDir == NULL || mci->mci_host == NULL)
 975                 return;
 976
 977         if (tTd(56, 1))
 978                 sm_dprintf("mci_store_persistent: Storing information for %s\n",
 979                            mci->mci_host);
 980
 981         if (mci->mci_statfile == NULL)
 982         {
 983                 if (tTd(56, 1))
 984                         sm_dprintf("mci_store_persistent: no statfile\n");
 985                 return;
 986         }
 987
 988         sm_io_rewind(mci->mci_statfile, SM_TIME_DEFAULT);
 989 #if !NOFTRUNCATE
 990         (void) ftruncate(sm_io_getinfo(mci->mci_statfile, SM_IO_WHAT_FD, NULL),
 991                          (off_t) 0);
 992 #endif /* !NOFTRUNCATE */
 993
 994         (void) sm_io_fprintf(mci->mci_statfile, SM_TIME_DEFAULT, "V0\n");
 995         (void) sm_io_fprintf(mci->mci_statfile, SM_TIME_DEFAULT, "E%d\n",
 996                              mci->mci_errno);
 997         (void) sm_io_fprintf(mci->mci_statfile, SM_TIME_DEFAULT, "H%d\n",
 998                              mci->mci_herrno);
 999         (void) sm_io_fprintf(mci->mci_statfile, SM_TIME_DEFAULT, "S%d\n",
1000                              mci->mci_exitstat);
1001         if (mci->mci_status != NULL)
1002                 (void) sm_io_fprintf(mci->mci_statfile, SM_TIME_DEFAULT,
1003                                      "D%.80s\n",
1004                                      denlstring(mci->mci_status, true, false));
1005         if (mci->mci_rstatus != NULL)
1006                 (void) sm_io_fprintf(mci->mci_statfile, SM_TIME_DEFAULT,
1007                                      "R%.80s\n",
1008                                      denlstring(mci->mci_rstatus, true, false));
1009         (void) sm_io_fprintf(mci->mci_statfile, SM_TIME_DEFAULT, "U%ld\n",
1010                              (long)(mci->mci_lastuse));
1011         (void) sm_io_fprintf(mci->mci_statfile, SM_TIME_DEFAULT, ".\n");
1012
1013         (void) sm_io_flush(mci->mci_statfile, SM_TIME_DEFAULT);
1014
1015         errno = save_errno;
1016         return;
1017 }
1018 /*
1019 **  MCI_TRAVERSE_PERSISTENT -- walk persistent status tree
1020 **
1021 **      Recursively find all the mci host files in `pathname'.  Default to
1022 **              main host status directory if no path is provided.
1023 **      Call (*action)(pathname, host) for each file found.
1024 **
1025 **      Note: all information is collected in a list before it is processed.
1026 **      This may not be the best way to do it, but it seems safest, since
1027 **      the file system would be touched while we are attempting to traverse
1028 **      the directory tree otherwise (during purges).
1029 **
1030 **      Parameters:
1031 **              action -- function to call on each node.  If returns < 0,
1032 **                      return immediately.
1033 **              pathname -- root of tree.  If null, use main host status
1034 **                      directory.
1035 **
1036 **      Returns:
1037 **              < 0 -- if any action routine returns a negative value, that
1038 **                      value is returned.
1039 **              0 -- if we successfully went to completion.
1040 **              > 0 -- return status from action()
1041 */
1042
1043 int
1044 mci_traverse_persistent(action, pathname)
1045         int (*action)();
1046         char *pathname;
1047 {
1048         struct stat statbuf;
1049         DIR *d;
1050         int ret;
1051
1052         if (pathname == NULL)
1053                 pathname = HostStatDir;
1054         if (pathname == NULL)
1055                 return -1;
1056
1057         if (tTd(56, 1))
1058                 sm_dprintf("mci_traverse: pathname is %s\n", pathname);
1059
1060         ret = stat(pathname, &statbuf);
1061         if (ret < 0)
1062         {
1063                 if (tTd(56, 2))
1064                         sm_dprintf("mci_traverse: Failed to stat %s: %s\n",
1065                                 pathname, sm_errstring(errno));
1066                 return ret;
1067         }
1068         if (S_ISDIR(statbuf.st_mode))
1069         {
1070                 bool leftone, removedone;
1071                 size_t len;
1072                 char *newptr;
1073                 struct dirent *e;
1074                 char newpath[MAXPATHLEN];
1075
1076                 if ((d = opendir(pathname)) == NULL)
1077                 {
1078                         if (tTd(56, 2))
1079                                 sm_dprintf("mci_traverse: opendir %s: %s\n",
1080                                         pathname, sm_errstring(errno));
1081                         return -1;
1082                 }
1083                 len = sizeof(newpath) - MAXNAMLEN - 3;
1084                 if (sm_strlcpy(newpath, pathname, len) >= len)
1085                 {
1086                         if (tTd(56, 2))
1087                                 sm_dprintf("mci_traverse: path \"%s\" too long",
1088                                         pathname);
1089                         return -1;
1090                 }
1091                 newptr = newpath + strlen(newpath);
1092                 *newptr++ = '/';
1093
1094                 /*
1095                 **  repeat until no file has been removed
1096                 **  this may become ugly when several files "expire"
1097                 **  during these loops, but it's better than doing
1098                 **  a rewinddir() inside the inner loop
1099                 */
1100
1101                 do
1102                 {
1103                         leftone = removedone = false;
1104                         while ((e = readdir(d)) != NULL)
1105                         {
1106                                 if (e->d_name[0] == '.')
1107                                         continue;
1108
1109                                 (void) sm_strlcpy(newptr, e->d_name,
1110                                                sizeof newpath -
1111                                                (newptr - newpath));
1112
1113                                 if (StopRequest)
1114                                         stop_sendmail();
1115                                 ret = mci_traverse_persistent(action, newpath);
1116                                 if (ret < 0)
1117                                         break;
1118                                 if (ret == 1)
1119                                         leftone = true;
1120                                 if (!removedone && ret == 0 &&
1121                                     action == mci_purge_persistent)
1122                                         removedone = true;
1123                         }
1124                         if (ret < 0)
1125                                 break;
1126
1127                         /*
1128                         **  The following appears to be
1129                         **  necessary during purges, since
1130                         **  we modify the directory structure
1131                         */
1132
1133                         if (removedone)
1134                                 rewinddir(d);
1135                         if (tTd(56, 40))
1136                                 sm_dprintf("mci_traverse: path %s: ret %d removed %d left %d\n",
1137                                         pathname, ret, removedone, leftone);
1138                 } while (removedone);
1139
1140                 /* purge (or whatever) the directory proper */
1141                 if (!leftone)
1142                 {
1143                         *--newptr = '\0';
1144                         ret = (*action)(newpath, NULL);
1145                 }
1146                 (void) closedir(d);
1147         }
1148         else if (S_ISREG(statbuf.st_mode))
1149         {
1150                 char *end = pathname + strlen(pathname) - 1;
1151                 char *start;
1152                 char *scan;
1153                 char host[MAXHOSTNAMELEN];
1154                 char *hostptr = host;
1155
1156                 /*
1157                 **  Reconstruct the host name from the path to the
1158                 **  persistent information.
1159                 */
1160
1161                 do
1162                 {
1163                         if (hostptr != host)
1164                                 *(hostptr++) = '.';
1165                         start = end;
1166                         while (start > pathname && *(start - 1) != '/')
1167                                 start--;
1168
1169                         if (*end == '.')
1170                                 end--;
1171
1172                         for (scan = start; scan <= end; scan++)
1173                                 *(hostptr++) = *scan;
1174
1175                         end = start - 2;
1176                 } while (end > pathname && *end == '.');
1177
1178                 *hostptr = '\0';
1179
1180                 /*
1181                 **  Do something with the file containing the persistent
1182                 **  information.
1183                 */
1184
1185                 ret = (*action)(pathname, host);
1186         }
1187
1188         return ret;
1189 }
1190 /*
1191 **  MCI_PRINT_PERSISTENT -- print persistent info
1192 **
1193 **      Dump the persistent information in the file 'pathname'
1194 **
1195 **      Parameters:
1196 **              pathname -- the pathname to the status file.
1197 **              hostname -- the corresponding host name.
1198 **
1199 **      Returns:
1200 **              0
1201 */
1202
1203 int
1204 mci_print_persistent(pathname, hostname)
1205         char *pathname;
1206         char *hostname;
1207 {
1208         static bool initflag = false;
1209         SM_FILE_T *fp;
1210         int width = Verbose ? 78 : 25;
1211         bool locked;
1212         MCI mcib;
1213
1214         /* skip directories */
1215         if (hostname == NULL)
1216                 return 0;
1217
1218         if (StopRequest)
1219                 stop_sendmail();
1220
1221         if (!initflag)
1222         {
1223                 initflag = true;
1224                 (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
1225                                      " -------------- Hostname --------------- How long ago ---------Results---------\n");
1226         }
1227
1228         fp = safefopen(pathname, O_RDONLY, FileMode,
1229                        SFF_NOLOCK|SFF_NOLINK|SFF_OPENASROOT|SFF_REGONLY|SFF_SAFEDIRPATH);
1230
1231         if (fp == NULL)
1232         {
1233                 if (tTd(56, 1))
1234                         sm_dprintf("mci_print_persistent: cannot open %s: %s\n",
1235                                 pathname, sm_errstring(errno));
1236                 return 0;
1237         }
1238
1239         FileName = pathname;
1240         memset(&mcib, '\0', sizeof mcib);
1241         if (mci_read_persistent(fp, &mcib) < 0)
1242         {
1243                 syserr("%s: could not read status file", pathname);
1244                 (void) sm_io_close(fp, SM_TIME_DEFAULT);
1245                 FileName = NULL;
1246                 return 0;
1247         }
1248
1249         locked = !lockfile(sm_io_getinfo(fp, SM_IO_WHAT_FD, NULL), pathname,
1250                            "", LOCK_SH|LOCK_NB);
1251         (void) sm_io_close(fp, SM_TIME_DEFAULT);
1252         FileName = NULL;
1253
1254         (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT, "%c%-39s %12s ",
1255                              locked ? '*' : ' ', hostname,
1256                              pintvl(curtime() - mcib.mci_lastuse, true));
1257         if (mcib.mci_rstatus != NULL)
1258                 (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT, "%.*s\n", width,
1259                                      mcib.mci_rstatus);
1260         else if (mcib.mci_exitstat == EX_TEMPFAIL && mcib.mci_errno != 0)
1261                 (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
1262                                      "Deferred: %.*s\n", width - 10,
1263                                      sm_errstring(mcib.mci_errno));
1264         else if (mcib.mci_exitstat != 0)
1265         {
1266                 char *exmsg = sm_sysexmsg(mcib.mci_exitstat);
1267
1268                 if (exmsg == NULL)
1269                 {
1270                         char buf[80];
1271
1272                         (void) sm_snprintf(buf, sizeof buf,
1273                                 "Unknown mailer error %d",
1274                                 mcib.mci_exitstat);
1275                         (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT, "%.*s\n",
1276                                              width, buf);
1277                 }
1278                 else
1279                         (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT, "%.*s\n",
1280                                              width, &exmsg[5]);
1281         }
1282         else if (mcib.mci_errno == 0)
1283                 (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT, "OK\n");
1284         else
1285                 (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT, "OK: %.*s\n",
1286                                      width - 4, sm_errstring(mcib.mci_errno));
1287
1288         return 0;
1289 }
1290 /*
1291 **  MCI_PURGE_PERSISTENT -- Remove a persistence status file.
1292 **
1293 **      Parameters:
1294 **              pathname -- path to the status file.
1295 **              hostname -- name of host corresponding to that file.
1296 **                      NULL if this is a directory (domain).
1297 **
1298 **      Returns:
1299 **              0 -- ok
1300 **              1 -- file not deleted (too young, incorrect format)
1301 **              < 0 -- some error occurred
1302 */
1303
1304 int
1305 mci_purge_persistent(pathname, hostname)
1306         char *pathname;
1307         char *hostname;
1308 {
1309         struct stat statbuf;
1310         char *end = pathname + strlen(pathname) - 1;
1311         int ret;
1312
1313         if (tTd(56, 1))
1314                 sm_dprintf("mci_purge_persistent: purging %s\n", pathname);
1315
1316         ret = stat(pathname, &statbuf);
1317         if (ret < 0)
1318         {
1319                 if (tTd(56, 2))
1320                         sm_dprintf("mci_purge_persistent: Failed to stat %s: %s\n",
1321                                 pathname, sm_errstring(errno));
1322                 return ret;
1323         }
1324         if (curtime() - statbuf.st_mtime <= MciInfoTimeout)
1325                 return 1;
1326         if (hostname != NULL)
1327         {
1328                 /* remove the file */
1329                 ret = unlink(pathname);
1330                 if (ret < 0)
1331                 {
1332                         if (LogLevel > 8)
1333                                 sm_syslog(LOG_ERR, NOQID,
1334                                           "mci_purge_persistent: failed to unlink %s: %s",
1335                                           pathname, sm_errstring(errno));
1336                         if (tTd(56, 2))
1337                                 sm_dprintf("mci_purge_persistent: failed to unlink %s: %s\n",
1338                                         pathname, sm_errstring(errno));
1339                         return ret;
1340                 }
1341         }
1342         else
1343         {
1344                 /* remove the directory */
1345                 if (*end != '.')
1346                         return 1;
1347
1348                 if (tTd(56, 1))
1349                         sm_dprintf("mci_purge_persistent: dpurge %s\n", pathname);
1350
1351                 ret = rmdir(pathname);
1352                 if (ret < 0)
1353                 {
1354                         if (tTd(56, 2))
1355                                 sm_dprintf("mci_purge_persistent: rmdir %s: %s\n",
1356                                         pathname, sm_errstring(errno));
1357                         return ret;
1358                 }
1359         }
1360
1361         return 0;
1362 }
1363 /*
1364 **  MCI_GENERATE_PERSISTENT_PATH -- generate path from hostname
1365 **
1366 **      Given `host', convert from a.b.c to $HostStatDir/c./b./a,
1367 **      putting the result into `path'.  if `createflag' is set, intervening
1368 **      directories will be created as needed.
1369 **
1370 **      Parameters:
1371 **              host -- host name to convert from.
1372 **              path -- place to store result.
1373 **              pathlen -- length of path buffer.
1374 **              createflag -- if set, create intervening directories as
1375 **                      needed.
1376 **
1377 **      Returns:
1378 **              0 -- success
1379 **              -1 -- failure
1380 */
1381
1382 static int
1383 mci_generate_persistent_path(host, path, pathlen, createflag)
1384         const char *host;
1385         char *path;
1386         int pathlen;
1387         bool createflag;
1388 {
1389         char *elem, *p, *x, ch;
1390         int ret = 0;
1391         int len;
1392         char t_host[MAXHOSTNAMELEN];
1393 #if NETINET6
1394         struct in6_addr in6_addr;
1395 #endif /* NETINET6 */
1396
1397         /*
1398         **  Rationality check the arguments.
1399         */
1400
1401         if (host == NULL)
1402         {
1403                 syserr("mci_generate_persistent_path: null host");
1404                 return -1;
1405         }
1406         if (path == NULL)
1407         {
1408                 syserr("mci_generate_persistent_path: null path");
1409                 return -1;
1410         }
1411
1412         if (tTd(56, 80))
1413                 sm_dprintf("mci_generate_persistent_path(%s): ", host);
1414
1415         if (*host == '\0' || *host == '.')
1416                 return -1;
1417
1418         /* make certain this is not a bracketed host number */
1419         if (strlen(host) > sizeof t_host - 1)
1420                 return -1;
1421         if (host[0] == '[')
1422                 (void) sm_strlcpy(t_host, host + 1, sizeof t_host);
1423         else
1424                 (void) sm_strlcpy(t_host, host, sizeof t_host);
1425
1426         /*
1427         **  Delete any trailing dots from the hostname.
1428         **  Leave 'elem' pointing at the \0.
1429         */
1430
1431         elem = t_host + strlen(t_host);
1432         while (elem > t_host &&
1433                (elem[-1] == '.' || (host[0] == '[' && elem[-1] == ']')))
1434                 *--elem = '\0';
1435
1436         /* check for bogus bracketed address */
1437         if (host[0] == '[')
1438         {
1439                 bool good = false;
1440 # if NETINET6
1441                 if (anynet_pton(AF_INET6, t_host, &in6_addr) == 1)
1442                         good = true;
1443 # endif /* NETINET6 */
1444 # if NETINET
1445                 if (inet_addr(t_host) != INADDR_NONE)
1446                         good = true;
1447 # endif /* NETINET */
1448                 if (!good)
1449                         return -1;
1450         }
1451
1452         /* check for what will be the final length of the path */
1453         len = strlen(HostStatDir) + 2;
1454         for (p = (char *) t_host; *p != '\0'; p++)
1455         {
1456                 if (*p == '.')
1457                         len++;
1458                 len++;
1459                 if (p[0] == '.' && p[1] == '.')
1460                         return -1;
1461         }
1462         if (len > pathlen || len < 1)
1463                 return -1;
1464         (void) sm_strlcpy(path, HostStatDir, pathlen);
1465         p = path + strlen(path);
1466         while (elem > t_host)
1467         {
1468                 if (!path_is_dir(path, createflag))
1469                 {
1470                         ret = -1;
1471                         break;
1472                 }
1473                 elem--;
1474                 while (elem >= t_host && *elem != '.')
1475                         elem--;
1476                 *p++ = '/';
1477                 x = elem + 1;
1478                 while ((ch = *x++) != '\0' && ch != '.')
1479                 {
1480                         if (isascii(ch) && isupper(ch))
1481                                 ch = tolower(ch);
1482                         if (ch == '/')
1483                                 ch = ':';       /* / -> : */
1484                         *p++ = ch;
1485                 }
1486                 if (elem >= t_host)
1487                         *p++ = '.';
1488                 *p = '\0';
1489         }
1490         if (tTd(56, 80))
1491         {
1492                 if (ret < 0)
1493                         sm_dprintf("FAILURE %d\n", ret);
1494                 else
1495                         sm_dprintf("SUCCESS %s\n", path);
1496         }
1497         return ret;
1498 }