1 /* 2 * Copyright (c) 1983 Eric P. Allman 3 * Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 # include "sendmail.h" 10 # include <pwd.h> 11 12 #ifndef lint 13 static char sccsid[] = "@(#)alias.c 8.16 (Berkeley) 09/25/93"; 14 #endif /* not lint */ 15 16 17 MAP *AliasDB[MAXALIASDB + 1]; /* actual database list */ 18 int NAliasDBs; /* number of alias databases */ 19 /* 20 ** ALIAS -- Compute aliases. 21 ** 22 ** Scans the alias file for an alias for the given address. 23 ** If found, it arranges to deliver to the alias list instead. 24 ** Uses libdbm database if -DDBM. 25 ** 26 ** Parameters: 27 ** a -- address to alias. 28 ** sendq -- a pointer to the head of the send queue 29 ** to put the aliases in. 30 ** e -- the current envelope. 31 ** 32 ** Returns: 33 ** none 34 ** 35 ** Side Effects: 36 ** Aliases found are expanded. 37 ** 38 ** Deficiencies: 39 ** It should complain about names that are aliased to 40 ** nothing. 41 */ 42 43 alias(a, sendq, e) 44 register ADDRESS *a; 45 ADDRESS **sendq; 46 register ENVELOPE *e; 47 { 48 register char *p; 49 int naliases; 50 char *owner; 51 char obuf[MAXNAME + 6]; 52 extern char *aliaslookup(); 53 54 if (tTd(27, 1)) 55 printf("alias(%s)\n", a->q_paddr); 56 57 /* don't realias already aliased names */ 58 if (bitset(QDONTSEND|QBADADDR|QVERIFIED, a->q_flags)) 59 return; 60 61 if (NoAlias) 62 return; 63 64 e->e_to = a->q_paddr; 65 66 /* 67 ** Look up this name 68 */ 69 70 p = aliaslookup(a->q_user, e); 71 if (p == NULL) 72 return; 73 74 /* 75 ** Match on Alias. 76 ** Deliver to the target list. 77 */ 78 79 if (tTd(27, 1)) 80 printf("%s (%s, %s) aliased to %s\n", 81 a->q_paddr, a->q_host, a->q_user, p); 82 if (bitset(EF_VRFYONLY, e->e_flags)) 83 { 84 a->q_flags |= QVERIFIED; 85 e->e_nrcpts++; 86 return; 87 } 88 message("aliased to %s", p); 89 #ifdef LOG 90 if (LogLevel > 9) 91 syslog(LOG_INFO, "%s: alias %s => %s", e->e_id, a->q_paddr, p); 92 #endif 93 a->q_flags &= ~QSELFREF; 94 AliasLevel++; 95 naliases = sendtolist(p, a, sendq, e); 96 AliasLevel--; 97 if (!bitset(QSELFREF, a->q_flags)) 98 { 99 if (tTd(27, 5)) 100 { 101 printf("alias: QDONTSEND "); 102 printaddr(a, FALSE); 103 } 104 a->q_flags |= QDONTSEND; 105 } 106 107 /* 108 ** Look for owner of alias 109 */ 110 111 (void) strcpy(obuf, "owner-"); 112 if (strncmp(a->q_user, "owner-", 6) == 0) 113 (void) strcat(obuf, "owner"); 114 else 115 (void) strcat(obuf, a->q_user); 116 if (!bitnset(M_USR_UPPER, a->q_mailer->m_flags)) 117 makelower(obuf); 118 owner = aliaslookup(obuf, e); 119 if (owner != NULL) 120 { 121 if (strchr(owner, ',') != NULL) 122 owner = obuf; 123 a->q_owner = newstr(owner); 124 } 125 } 126 /* 127 ** ALIASLOOKUP -- look up a name in the alias file. 128 ** 129 ** Parameters: 130 ** name -- the name to look up. 131 ** 132 ** Returns: 133 ** the value of name. 134 ** NULL if unknown. 135 ** 136 ** Side Effects: 137 ** none. 138 ** 139 ** Warnings: 140 ** The return value will be trashed across calls. 141 */ 142 143 char * 144 aliaslookup(name, e) 145 char *name; 146 ENVELOPE *e; 147 { 148 register int dbno; 149 register MAP *map; 150 register char *p; 151 152 for (dbno = 0; dbno < NAliasDBs; dbno++) 153 { 154 auto int stat; 155 156 map = AliasDB[dbno]; 157 if (!bitset(MF_OPEN, map->map_mflags)) 158 continue; 159 p = (*map->map_class->map_lookup)(map, name, NULL, &stat); 160 if (p != NULL) 161 return p; 162 } 163 return NULL; 164 } 165 /* 166 ** SETALIAS -- set up an alias map 167 ** 168 ** Called when reading configuration file. 169 ** 170 ** Parameters: 171 ** spec -- the alias specification 172 ** 173 ** Returns: 174 ** none. 175 */ 176 177 setalias(spec) 178 char *spec; 179 { 180 register char *p; 181 register MAP *map; 182 char *class; 183 STAB *s; 184 185 if (tTd(27, 8)) 186 printf("setalias(%s)\n", spec); 187 188 for (p = spec; p != NULL; ) 189 { 190 char aname[50]; 191 192 while (isspace(*p)) 193 p++; 194 if (*p == '\0') 195 break; 196 spec = p; 197 198 if (NAliasDBs >= MAXALIASDB) 199 { 200 syserr("Too many alias databases defined, %d max", MAXALIASDB); 201 return; 202 } 203 (void) sprintf(aname, "Alias%d", NAliasDBs); 204 s = stab(aname, ST_MAP, ST_ENTER); 205 map = &s->s_map; 206 AliasDB[NAliasDBs] = map; 207 bzero(map, sizeof *map); 208 209 p = strpbrk(p, " ,/:"); 210 if (p != NULL && *p == ':') 211 { 212 /* map name */ 213 *p++ = '\0'; 214 class = spec; 215 spec = p; 216 } 217 else 218 { 219 class = "implicit"; 220 map->map_mflags = MF_OPTIONAL|MF_INCLNULL; 221 } 222 223 /* find end of spec */ 224 if (p != NULL) 225 p = strchr(p, ','); 226 if (p != NULL) 227 *p++ = '\0'; 228 229 /* look up class */ 230 s = stab(class, ST_MAPCLASS, ST_FIND); 231 if (s == NULL) 232 { 233 if (tTd(27, 1)) 234 printf("Unknown alias class %s\n", class); 235 } 236 else if (!bitset(MCF_ALIASOK, s->s_mapclass.map_cflags)) 237 { 238 syserr("setalias: map class %s can't handle aliases", 239 class); 240 } 241 else 242 { 243 map->map_class = &s->s_mapclass; 244 if (map->map_class->map_parse(map, spec)) 245 { 246 map->map_mflags |= MF_VALID|MF_ALIAS; 247 NAliasDBs++; 248 } 249 } 250 } 251 } 252 /* 253 ** ALIASWAIT -- wait for distinguished @:@ token to appear. 254 ** 255 ** This can decide to reopen or rebuild the alias file 256 */ 257 258 aliaswait(map, ext) 259 MAP *map; 260 char *ext; 261 { 262 int atcnt; 263 time_t mtime; 264 struct stat stb; 265 char buf[MAXNAME]; 266 267 if (tTd(27, 3)) 268 printf("aliaswait(%s:%s)\n", 269 map->map_class->map_cname, map->map_file); 270 if (bitset(MF_ALIASWAIT, map->map_mflags)) 271 return; 272 map->map_mflags |= MF_ALIASWAIT; 273 274 atcnt = SafeAlias * 2; 275 if (atcnt > 0) 276 { 277 auto int st; 278 279 while (atcnt-- >= 0 && 280 map->map_class->map_lookup(map, "@", NULL, &st) == NULL) 281 { 282 /* 283 ** Close and re-open the alias database in case 284 ** the one is mv'ed instead of cp'ed in. 285 */ 286 287 if (tTd(27, 2)) 288 printf("aliaswait: sleeping\n"); 289 290 map->map_class->map_close(map); 291 sleep(30); 292 map->map_class->map_open(map, O_RDONLY); 293 } 294 } 295 296 /* see if we need to go into auto-rebuild mode */ 297 if (!bitset(MCF_REBUILDABLE, map->map_class->map_cflags)) 298 { 299 if (tTd(27, 3)) 300 printf("aliaswait: not rebuildable\n"); 301 map->map_mflags &= ~MF_ALIASWAIT; 302 return; 303 } 304 if (stat(map->map_file, &stb) < 0) 305 { 306 if (tTd(27, 3)) 307 printf("aliaswait: no source file\n"); 308 map->map_mflags &= ~MF_ALIASWAIT; 309 return; 310 } 311 mtime = stb.st_mtime; 312 (void) strcpy(buf, map->map_file); 313 if (ext != NULL) 314 (void) strcat(buf, ext); 315 if (stat(buf, &stb) < 0 || stb.st_mtime < mtime || atcnt < 0) 316 { 317 /* database is out of date */ 318 if (AutoRebuild && stb.st_ino != 0 && stb.st_uid == geteuid()) 319 { 320 message("auto-rebuilding alias database %s", buf); 321 rebuildaliases(map, TRUE); 322 } 323 else 324 { 325 #ifdef LOG 326 if (LogLevel > 3) 327 syslog(LOG_INFO, "alias database %s out of date", 328 buf); 329 #endif /* LOG */ 330 message("Warning: alias database %s out of date", buf); 331 } 332 } 333 map->map_mflags &= ~MF_ALIASWAIT; 334 } 335 /* 336 ** REBUILDALIASES -- rebuild the alias database. 337 ** 338 ** Parameters: 339 ** map -- the database to rebuild. 340 ** automatic -- set if this was automatically generated. 341 ** 342 ** Returns: 343 ** none. 344 ** 345 ** Side Effects: 346 ** Reads the text version of the database, builds the 347 ** DBM or DB version. 348 */ 349 350 rebuildaliases(map, automatic) 351 register MAP *map; 352 bool automatic; 353 { 354 FILE *af; 355 bool nolock = FALSE; 356 sigfunc_t oldsigint; 357 358 if (!bitset(MCF_REBUILDABLE, map->map_class->map_cflags)) 359 return; 360 361 /* try to lock the source file */ 362 if ((af = fopen(map->map_file, "r+")) == NULL) 363 { 364 if (errno != EACCES || automatic || 365 (af = fopen(map->map_file, "r")) == NULL) 366 { 367 int saveerr = errno; 368 369 if (tTd(27, 1)) 370 printf("Can't open %s: %s\n", 371 map->map_file, errstring(saveerr)); 372 if (!automatic) 373 message("newaliases: cannot open %s: %s", 374 map->map_file, errstring(saveerr)); 375 errno = 0; 376 return; 377 } 378 nolock = TRUE; 379 message("warning: cannot lock %s: %s", 380 map->map_file, errstring(errno)); 381 } 382 383 /* see if someone else is rebuilding the alias file */ 384 if (!nolock && 385 !lockfile(fileno(af), map->map_file, NULL, LOCK_EX|LOCK_NB)) 386 { 387 /* yes, they are -- wait until done */ 388 message("Alias file %s is already being rebuilt", 389 map->map_file); 390 if (OpMode != MD_INITALIAS) 391 { 392 /* wait for other rebuild to complete */ 393 (void) lockfile(fileno(af), map->map_file, NULL, 394 LOCK_EX); 395 } 396 (void) fclose(af); 397 errno = 0; 398 return; 399 } 400 401 oldsigint = setsignal(SIGINT, SIG_IGN); 402 403 if (map->map_class->map_open(map, O_RDWR)) 404 { 405 #ifdef LOG 406 if (LogLevel > 7) 407 { 408 syslog(LOG_NOTICE, "alias database %s %srebuilt by %s", 409 map->map_file, automatic ? "auto" : "", 410 username()); 411 } 412 #endif /* LOG */ 413 map->map_mflags |= MF_OPEN|MF_WRITABLE; 414 readaliases(map, af, automatic); 415 } 416 else 417 { 418 if (tTd(27, 1)) 419 printf("Can't create database for %s: %s\n", 420 map->map_file, errstring(errno)); 421 if (!automatic) 422 syserr("Cannot create database for alias file %s", 423 map->map_file); 424 } 425 426 /* close the file, thus releasing locks */ 427 fclose(af); 428 429 /* add distinguished entries and close the database */ 430 if (bitset(MF_OPEN, map->map_mflags)) 431 map->map_class->map_close(map); 432 433 /* restore the old signal */ 434 (void) setsignal(SIGINT, oldsigint); 435 } 436 /* 437 ** READALIASES -- read and process the alias file. 438 ** 439 ** This routine implements the part of initaliases that occurs 440 ** when we are not going to use the DBM stuff. 441 ** 442 ** Parameters: 443 ** map -- the alias database descriptor. 444 ** af -- file to read the aliases from. 445 ** automatic -- set if this was an automatic rebuild. 446 ** 447 ** Returns: 448 ** none. 449 ** 450 ** Side Effects: 451 ** Reads aliasfile into the symbol table. 452 ** Optionally, builds the .dir & .pag files. 453 */ 454 455 readaliases(map, af, automatic) 456 register MAP *map; 457 FILE *af; 458 int automatic; 459 { 460 register char *p; 461 char *rhs; 462 bool skipping; 463 long naliases, bytes, longest; 464 ADDRESS al, bl; 465 char line[BUFSIZ]; 466 467 /* 468 ** Read and interpret lines 469 */ 470 471 FileName = map->map_file; 472 LineNumber = 0; 473 naliases = bytes = longest = 0; 474 skipping = FALSE; 475 while (fgets(line, sizeof (line), af) != NULL) 476 { 477 int lhssize, rhssize; 478 479 LineNumber++; 480 p = strchr(line, '\n'); 481 if (p != NULL) 482 *p = '\0'; 483 switch (line[0]) 484 { 485 case '#': 486 case '\0': 487 skipping = FALSE; 488 continue; 489 490 case ' ': 491 case '\t': 492 if (!skipping) 493 syserr("554 Non-continuation line starts with space"); 494 skipping = TRUE; 495 continue; 496 } 497 skipping = FALSE; 498 499 /* 500 ** Process the LHS 501 ** Find the colon separator, and parse the address. 502 ** It should resolve to a local name -- this will 503 ** be checked later (we want to optionally do 504 ** parsing of the RHS first to maximize error 505 ** detection). 506 */ 507 508 for (p = line; *p != '\0' && *p != ':' && *p != '\n'; p++) 509 continue; 510 if (*p++ != ':') 511 { 512 syserr("554 missing colon"); 513 continue; 514 } 515 if (parseaddr(line, &al, RF_COPYALL, ':', NULL, CurEnv) == NULL) 516 { 517 syserr("554 %s... illegal alias name", al.q_paddr); 518 continue; 519 } 520 521 /* 522 ** Process the RHS. 523 ** 'al' is the internal form of the LHS address. 524 ** 'p' points to the text of the RHS. 525 */ 526 527 while (isascii(*p) && isspace(*p)) 528 p++; 529 rhs = p; 530 for (;;) 531 { 532 register char c; 533 register char *nlp; 534 535 nlp = &p[strlen(p)]; 536 if (nlp[-1] == '\n') 537 *--nlp = '\0'; 538 539 if (CheckAliases) 540 { 541 /* do parsing & compression of addresses */ 542 while (*p != '\0') 543 { 544 auto char *delimptr; 545 546 while ((isascii(*p) && isspace(*p)) || 547 *p == ',') 548 p++; 549 if (*p == '\0') 550 break; 551 if (parseaddr(p, &bl, RF_COPYNONE, ',', 552 &delimptr, CurEnv) == NULL) 553 usrerr("553 %s... bad address", p); 554 p = delimptr; 555 } 556 } 557 else 558 { 559 p = nlp; 560 } 561 562 /* see if there should be a continuation line */ 563 c = fgetc(af); 564 if (!feof(af)) 565 (void) ungetc(c, af); 566 if (c != ' ' && c != '\t') 567 break; 568 569 /* read continuation line */ 570 if (fgets(p, sizeof line - (p - line), af) == NULL) 571 break; 572 LineNumber++; 573 574 /* check for line overflow */ 575 if (strchr(p, '\n') == NULL) 576 { 577 usrerr("554 alias too long"); 578 break; 579 } 580 } 581 if (al.q_mailer != LocalMailer) 582 { 583 syserr("554 %s... cannot alias non-local names", 584 al.q_paddr); 585 continue; 586 } 587 588 /* 589 ** Insert alias into symbol table or DBM file 590 */ 591 592 if (!bitnset(M_USR_UPPER, al.q_mailer->m_flags)) 593 makelower(al.q_user); 594 595 lhssize = strlen(al.q_user); 596 rhssize = strlen(rhs); 597 map->map_class->map_store(map, al.q_user, rhs); 598 599 if (al.q_paddr != NULL) 600 free(al.q_paddr); 601 if (al.q_host != NULL) 602 free(al.q_host); 603 if (al.q_user != NULL) 604 free(al.q_user); 605 606 /* statistics */ 607 naliases++; 608 bytes += lhssize + rhssize; 609 if (rhssize > longest) 610 longest = rhssize; 611 } 612 613 CurEnv->e_to = NULL; 614 FileName = NULL; 615 if (Verbose || !automatic) 616 message("%s: %d aliases, longest %d bytes, %d bytes total", 617 map->map_file, naliases, longest, bytes); 618 # ifdef LOG 619 if (LogLevel > 7) 620 syslog(LOG_INFO, "%s: %d aliases, longest %d bytes, %d bytes total", 621 map->map_file, naliases, longest, bytes); 622 # endif /* LOG */ 623 } 624 /* 625 ** FORWARD -- Try to forward mail 626 ** 627 ** This is similar but not identical to aliasing. 628 ** 629 ** Parameters: 630 ** user -- the name of the user who's mail we would like 631 ** to forward to. It must have been verified -- 632 ** i.e., the q_home field must have been filled 633 ** in. 634 ** sendq -- a pointer to the head of the send queue to 635 ** put this user's aliases in. 636 ** 637 ** Returns: 638 ** none. 639 ** 640 ** Side Effects: 641 ** New names are added to send queues. 642 */ 643 644 forward(user, sendq, e) 645 ADDRESS *user; 646 ADDRESS **sendq; 647 register ENVELOPE *e; 648 { 649 char *pp; 650 char *ep; 651 652 if (tTd(27, 1)) 653 printf("forward(%s)\n", user->q_paddr); 654 655 if (user->q_mailer != LocalMailer || bitset(QBADADDR, user->q_flags)) 656 return; 657 if (user->q_home == NULL) 658 { 659 syserr("554 forward: no home"); 660 user->q_home = "/nosuchdirectory"; 661 } 662 663 /* good address -- look for .forward file in home */ 664 define('z', user->q_home, e); 665 define('u', user->q_user, e); 666 define('h', user->q_host, e); 667 if (ForwardPath == NULL) 668 ForwardPath = newstr("\201z/.forward"); 669 670 for (pp = ForwardPath; pp != NULL; pp = ep) 671 { 672 int err; 673 char buf[MAXPATHLEN+1]; 674 675 ep = strchr(pp, ':'); 676 if (ep != NULL) 677 *ep = '\0'; 678 expand(pp, buf, &buf[sizeof buf - 1], e); 679 if (ep != NULL) 680 *ep++ = ':'; 681 if (tTd(27, 3)) 682 printf("forward: trying %s\n", buf); 683 684 err = include(buf, TRUE, user, sendq, e); 685 if (err == 0) 686 break; 687 else if (transienterror(err)) 688 { 689 /* we have to suspend this message */ 690 if (tTd(27, 2)) 691 printf("forward: transient error on %s\n", buf); 692 #ifdef LOG 693 if (LogLevel > 2) 694 syslog(LOG_ERR, "%s: forward %s: transient error: %s", 695 e->e_id, buf, errstring(err)); 696 #endif 697 message("%s: %s: message queued", buf, errstring(err)); 698 user->q_flags |= QQUEUEUP; 699 return; 700 } 701 } 702 } 703