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 #ifndef lint 10 static char sccsid[] = "@(#)conf.c 8.124 (Berkeley) 12/28/94"; 11 #endif /* not lint */ 12 13 # include "sendmail.h" 14 # include "pathnames.h" 15 # include <sys/ioctl.h> 16 # include <sys/param.h> 17 # include <netdb.h> 18 # include <pwd.h> 19 20 /* 21 ** CONF.C -- Sendmail Configuration Tables. 22 ** 23 ** Defines the configuration of this installation. 24 ** 25 ** Configuration Variables: 26 ** HdrInfo -- a table describing well-known header fields. 27 ** Each entry has the field name and some flags, 28 ** which are described in sendmail.h. 29 ** 30 ** Notes: 31 ** I have tried to put almost all the reasonable 32 ** configuration information into the configuration 33 ** file read at runtime. My intent is that anything 34 ** here is a function of the version of UNIX you 35 ** are running, or is really static -- for example 36 ** the headers are a superset of widely used 37 ** protocols. If you find yourself playing with 38 ** this file too much, you may be making a mistake! 39 */ 40 41 42 43 44 /* 45 ** Header info table 46 ** Final (null) entry contains the flags used for any other field. 47 ** 48 ** Not all of these are actually handled specially by sendmail 49 ** at this time. They are included as placeholders, to let 50 ** you know that "someday" I intend to have sendmail do 51 ** something with them. 52 */ 53 54 struct hdrinfo HdrInfo[] = 55 { 56 /* originator fields, most to least significant */ 57 "resent-sender", H_FROM|H_RESENT, 58 "resent-from", H_FROM|H_RESENT, 59 "resent-reply-to", H_FROM|H_RESENT, 60 "sender", H_FROM, 61 "from", H_FROM, 62 "reply-to", H_FROM, 63 "full-name", H_ACHECK, 64 "return-receipt-to", H_FROM|H_RECEIPTTO, 65 "errors-to", H_FROM|H_ERRORSTO, 66 67 /* destination fields */ 68 "to", H_RCPT, 69 "resent-to", H_RCPT|H_RESENT, 70 "cc", H_RCPT, 71 "resent-cc", H_RCPT|H_RESENT, 72 "bcc", H_RCPT|H_ACHECK, 73 "resent-bcc", H_RCPT|H_ACHECK|H_RESENT, 74 "apparently-to", H_RCPT, 75 76 /* message identification and control */ 77 "message-id", 0, 78 "resent-message-id", H_RESENT, 79 "message", H_EOH, 80 "text", H_EOH, 81 82 /* date fields */ 83 "date", 0, 84 "resent-date", H_RESENT, 85 86 /* trace fields */ 87 "received", H_TRACE|H_FORCE, 88 "x400-received", H_TRACE|H_FORCE, 89 "via", H_TRACE|H_FORCE, 90 "mail-from", H_TRACE|H_FORCE, 91 92 /* miscellaneous fields */ 93 "comments", H_FORCE, 94 "return-path", H_FORCE|H_ACHECK, 95 "content-transfer-encoding", H_CTE, 96 "content-type", H_CTYPE, 97 98 NULL, 0, 99 }; 100 101 102 103 /* 104 ** Location of system files/databases/etc. 105 */ 106 107 char *PidFile = _PATH_SENDMAILPID; /* stores daemon proc id */ 108 109 110 111 /* 112 ** Privacy values 113 */ 114 115 struct prival PrivacyValues[] = 116 { 117 "public", PRIV_PUBLIC, 118 "needmailhelo", PRIV_NEEDMAILHELO, 119 "needexpnhelo", PRIV_NEEDEXPNHELO, 120 "needvrfyhelo", PRIV_NEEDVRFYHELO, 121 "noexpn", PRIV_NOEXPN, 122 "novrfy", PRIV_NOVRFY, 123 "restrictmailq", PRIV_RESTRICTMAILQ, 124 "restrictqrun", PRIV_RESTRICTQRUN, 125 "authwarnings", PRIV_AUTHWARNINGS, 126 "noreceipts", PRIV_NORECEIPTS, 127 "goaway", PRIV_GOAWAY, 128 NULL, 0, 129 }; 130 131 132 133 /* 134 ** Miscellaneous stuff. 135 */ 136 137 int DtableSize = 50; /* max open files; reset in 4.2bsd */ 138 /* 139 ** SETDEFAULTS -- set default values 140 ** 141 ** Because of the way freezing is done, these must be initialized 142 ** using direct code. 143 ** 144 ** Parameters: 145 ** e -- the default envelope. 146 ** 147 ** Returns: 148 ** none. 149 ** 150 ** Side Effects: 151 ** Initializes a bunch of global variables to their 152 ** default values. 153 */ 154 155 #define DAYS * 24 * 60 * 60 156 157 setdefaults(e) 158 register ENVELOPE *e; 159 { 160 int i; 161 162 SpaceSub = ' '; /* option B */ 163 QueueLA = 8; /* option x */ 164 RefuseLA = 12; /* option X */ 165 WkRecipFact = 30000L; /* option y */ 166 WkClassFact = 1800L; /* option z */ 167 WkTimeFact = 90000L; /* option Z */ 168 QueueFactor = WkRecipFact * 20; /* option q */ 169 FileMode = (RealUid != geteuid()) ? 0644 : 0600; 170 /* option F */ 171 DefUid = 1; /* option u */ 172 DefGid = 1; /* option g */ 173 CheckpointInterval = 10; /* option C */ 174 MaxHopCount = 25; /* option h */ 175 e->e_sendmode = SM_FORK; /* option d */ 176 e->e_errormode = EM_PRINT; /* option e */ 177 SevenBitInput = FALSE; /* option 7 */ 178 MaxMciCache = 1; /* option k */ 179 MciCacheTimeout = 300; /* option K */ 180 LogLevel = 9; /* option L */ 181 inittimeouts(NULL); /* option r */ 182 PrivacyFlags = 0; /* option p */ 183 MimeMode = MM_CVTMIME|MM_PASS8BIT; /* option 8 */ 184 for (i = 0; i < MAXTOCLASS; i++) 185 { 186 TimeOuts.to_q_return[i] = 5 DAYS; /* option T */ 187 TimeOuts.to_q_warning[i] = 0; /* option T */ 188 } 189 ServiceSwitchFile = "/etc/service.switch"; 190 setdefuser(); 191 setupmaps(); 192 setupmailers(); 193 } 194 195 196 /* 197 ** SETDEFUSER -- set/reset DefUser using DefUid (for initgroups()) 198 */ 199 200 setdefuser() 201 { 202 struct passwd *defpwent; 203 static char defuserbuf[40]; 204 205 DefUser = defuserbuf; 206 if ((defpwent = getpwuid(DefUid)) != NULL) 207 strcpy(defuserbuf, defpwent->pw_name); 208 else 209 strcpy(defuserbuf, "nobody"); 210 } 211 /* 212 ** HOST_MAP_INIT -- initialize host class structures 213 */ 214 215 bool host_map_init __P((MAP *map, char *args)); 216 217 bool 218 host_map_init(map, args) 219 MAP *map; 220 char *args; 221 { 222 register char *p = args; 223 224 for (;;) 225 { 226 while (isascii(*p) && isspace(*p)) 227 p++; 228 if (*p != '-') 229 break; 230 switch (*++p) 231 { 232 case 'a': 233 map->map_app = ++p; 234 break; 235 } 236 while (*p != '\0' && !(isascii(*p) && isspace(*p))) 237 p++; 238 if (*p != '\0') 239 *p++ = '\0'; 240 } 241 if (map->map_app != NULL) 242 map->map_app = newstr(map->map_app); 243 return TRUE; 244 } 245 /* 246 ** SETUPMAILERS -- initialize default mailers 247 */ 248 249 setupmailers() 250 { 251 char buf[100]; 252 253 strcpy(buf, "prog, P=/bin/sh, F=lsoD, A=sh -c $u"); 254 makemailer(buf); 255 256 strcpy(buf, "*file*, P=/dev/null, F=lsDFMPEou, A=FILE"); 257 makemailer(buf); 258 259 strcpy(buf, "*include*, P=/dev/null, F=su, A=INCLUDE"); 260 makemailer(buf); 261 } 262 /* 263 ** SETUPMAPS -- set up map classes 264 */ 265 266 #define MAPDEF(name, ext, flags, parse, open, close, lookup, store) \ 267 { \ 268 extern bool parse __P((MAP *, char *)); \ 269 extern bool open __P((MAP *, int)); \ 270 extern void close __P((MAP *)); \ 271 extern char *lookup __P((MAP *, char *, char **, int *)); \ 272 extern void store __P((MAP *, char *, char *)); \ 273 s = stab(name, ST_MAPCLASS, ST_ENTER); \ 274 s->s_mapclass.map_cname = name; \ 275 s->s_mapclass.map_ext = ext; \ 276 s->s_mapclass.map_cflags = flags; \ 277 s->s_mapclass.map_parse = parse; \ 278 s->s_mapclass.map_open = open; \ 279 s->s_mapclass.map_close = close; \ 280 s->s_mapclass.map_lookup = lookup; \ 281 s->s_mapclass.map_store = store; \ 282 } 283 284 setupmaps() 285 { 286 register STAB *s; 287 288 #ifdef NEWDB 289 MAPDEF("hash", ".db", MCF_ALIASOK|MCF_REBUILDABLE, 290 map_parseargs, hash_map_open, db_map_close, 291 db_map_lookup, db_map_store); 292 293 MAPDEF("btree", ".db", MCF_ALIASOK|MCF_REBUILDABLE, 294 map_parseargs, bt_map_open, db_map_close, 295 db_map_lookup, db_map_store); 296 #endif 297 298 #ifdef NDBM 299 MAPDEF("dbm", ".dir", MCF_ALIASOK|MCF_REBUILDABLE, 300 map_parseargs, ndbm_map_open, ndbm_map_close, 301 ndbm_map_lookup, ndbm_map_store); 302 #endif 303 304 #ifdef NIS 305 MAPDEF("nis", NULL, MCF_ALIASOK, 306 map_parseargs, nis_map_open, null_map_close, 307 nis_map_lookup, null_map_store); 308 #endif 309 310 #ifdef NISPLUS 311 MAPDEF("nisplus", NULL, MCF_ALIASOK, 312 map_parseargs, nisplus_map_open, null_map_close, 313 nisplus_map_lookup, null_map_store); 314 #endif 315 316 #ifdef HESIOD 317 MAPDEF("hesiod", NULL, MCF_ALIASOK|MCF_ALIASONLY, 318 map_parseargs, null_map_open, null_map_close, 319 hesiod_map_lookup, null_map_store); 320 #endif 321 322 #ifdef NETINFO 323 MAPDEF("netinfo", NULL, MCF_ALIASOK, 324 map_parseargs, ni_map_open, null_map_close, 325 ni_map_lookup, null_map_store); 326 #endif 327 328 #if 0 329 MAPDEF("dns", NULL, 0, 330 dns_map_init, null_map_open, null_map_close, 331 dns_map_lookup, null_map_store); 332 #endif 333 334 MAPDEF("host", NULL, 0, 335 host_map_init, null_map_open, null_map_close, 336 host_map_lookup, null_map_store); 337 338 MAPDEF("text", NULL, MCF_ALIASOK, 339 map_parseargs, text_map_open, null_map_close, 340 text_map_lookup, null_map_store); 341 342 MAPDEF("stab", NULL, MCF_ALIASOK|MCF_ALIASONLY, 343 map_parseargs, stab_map_open, null_map_close, 344 stab_map_lookup, stab_map_store); 345 346 MAPDEF("implicit", NULL, MCF_ALIASOK|MCF_ALIASONLY|MCF_REBUILDABLE, 347 map_parseargs, impl_map_open, impl_map_close, 348 impl_map_lookup, impl_map_store); 349 350 /* access to system passwd file */ 351 MAPDEF("user", NULL, MCF_OPTFILE, 352 map_parseargs, user_map_open, null_map_close, 353 user_map_lookup, null_map_store); 354 355 /* dequote map */ 356 MAPDEF("dequote", NULL, 0, 357 dequote_init, null_map_open, null_map_close, 358 dequote_map, null_map_store); 359 360 #if 0 361 # ifdef USERDB 362 /* user database */ 363 MAPDEF("udb", ".db", 0, 364 udb_map_parse, null_map_open, null_map_close, 365 udb_map_lookup, null_map_store); 366 # endif 367 #endif 368 369 /* sequenced maps */ 370 MAPDEF("sequence", NULL, MCF_ALIASOK, 371 seq_map_parse, null_map_open, null_map_close, 372 seq_map_lookup, seq_map_store); 373 374 /* switched interface to sequenced maps */ 375 MAPDEF("switch", NULL, MCF_ALIASOK, 376 map_parseargs, switch_map_open, null_map_close, 377 seq_map_lookup, seq_map_store); 378 } 379 380 #undef MAPDEF 381 /* 382 ** INITHOSTMAPS -- initial host-dependent maps 383 ** 384 ** This should act as an interface to any local service switch 385 ** provided by the host operating system. 386 ** 387 ** Parameters: 388 ** none 389 ** 390 ** Returns: 391 ** none 392 ** 393 ** Side Effects: 394 ** Should define maps "host" and "users" as necessary 395 ** for this OS. If they are not defined, they will get 396 ** a default value later. It should check to make sure 397 ** they are not defined first, since it's possible that 398 ** the config file has provided an override. 399 */ 400 401 void 402 inithostmaps() 403 { 404 register int i; 405 int nmaps; 406 char *maptype[MAXMAPSTACK]; 407 short mapreturn[MAXMAPACTIONS]; 408 char buf[MAXLINE]; 409 410 /* 411 ** Make sure we have a host map. 412 */ 413 414 if (stab("host", ST_MAP, ST_FIND) == NULL) 415 { 416 /* user didn't initialize: set up host map */ 417 strcpy(buf, "host host"); 418 #if NAMED_BIND 419 if (ConfigLevel >= 2) 420 strcat(buf, " -a."); 421 #endif 422 makemapentry(buf); 423 } 424 425 /* 426 ** Set up default aliases maps 427 */ 428 429 nmaps = switch_map_find("aliases", maptype, mapreturn); 430 for (i = 0; i < nmaps; i++) 431 { 432 if (strcmp(maptype[i], "files") == 0 && 433 stab("aliases.files", ST_MAP, ST_FIND) == NULL) 434 { 435 strcpy(buf, "aliases.files implicit /etc/aliases"); 436 makemapentry(buf); 437 } 438 #ifdef NISPLUS 439 else if (strcmp(maptype[i], "nisplus") == 0 && 440 stab("aliases.nisplus", ST_MAP, ST_FIND) == NULL) 441 { 442 strcpy(buf, "aliases.nisplus nisplus -kalias -vexpansion -d mail_aliases.org_dir"); 443 makemapentry(buf); 444 } 445 #endif 446 #ifdef NIS 447 else if (strcmp(maptype[i], "nis") == 0 && 448 stab("aliases.nis", ST_MAP, ST_FIND) == NULL) 449 { 450 strcpy(buf, "aliases.nis nis -d mail.aliases"); 451 makemapentry(buf); 452 } 453 #endif 454 } 455 if (stab("aliases", ST_MAP, ST_FIND) == NULL) 456 { 457 strcpy(buf, "aliases switch aliases"); 458 makemapentry(buf); 459 } 460 strcpy(buf, "switch:aliases"); 461 setalias(buf); 462 463 #if 0 /* "user" map class is a better choice */ 464 /* 465 ** Set up default users maps. 466 */ 467 468 nmaps = switch_map_find("passwd", maptype, mapreturn); 469 for (i = 0; i < nmaps; i++) 470 { 471 if (strcmp(maptype[i], "files") == 0 && 472 stab("users.files", ST_MAP, ST_FIND) == NULL) 473 { 474 strcpy(buf, "users.files text -m -z: -k0 -v6 /etc/passwd"); 475 makemapentry(buf); 476 } 477 #ifdef NISPLUS 478 else if (strcmp(maptype[i], "nisplus") == 0 && 479 stab("users.nisplus", ST_MAP, ST_FIND) == NULL) 480 { 481 strcpy(buf, "users.nisplus nisplus -m -kname -vhome -d passwd.org_dir"); 482 makemapentry(buf); 483 } 484 #endif 485 #ifdef NIS 486 else if (strcmp(maptype[i], "nis") == 0 && 487 stab("users.nis", ST_MAP, ST_FIND) == NULL) 488 { 489 strcpy(buf, "users.nis nis -m -d passwd.byname"); 490 makemapentry(buf); 491 } 492 #endif 493 } 494 if (stab("users", ST_MAP, ST_FIND) == NULL) 495 { 496 strcpy(buf, "users switch -m passwd"); 497 makemapentry(buf); 498 } 499 #endif 500 } 501 /* 502 ** SWITCH_MAP_FIND -- find the list of types associated with a map 503 ** 504 ** This is the system-dependent interface to the service switch. 505 ** 506 ** Parameters: 507 ** service -- the name of the service of interest. 508 ** maptype -- an out-array of strings containing the types 509 ** of access to use for this service. There can 510 ** be at most MAXMAPSTACK types for a single service. 511 ** mapreturn -- an out-array of return information bitmaps 512 ** for the map. 513 ** 514 ** Returns: 515 ** The number of map types filled in, or -1 for failure. 516 */ 517 518 #ifdef SOLARIS 519 # include <nsswitch.h> 520 #endif 521 522 #if defined(ultrix) || defined(__osf__) 523 # include <sys/svcinfo.h> 524 #endif 525 526 int 527 switch_map_find(service, maptype, mapreturn) 528 char *service; 529 char *maptype[MAXMAPSTACK]; 530 short mapreturn[MAXMAPACTIONS]; 531 { 532 register FILE *fp; 533 int svcno; 534 static char buf[MAXLINE]; 535 536 #ifdef SOLARIS 537 struct __nsw_switchconfig *nsw_conf; 538 enum __nsw_parse_err pserr; 539 struct __nsw_lookup *lk; 540 int nsw_rc; 541 static struct __nsw_lookup lkp0 = 542 { "files", {1, 0, 0, 0}, NULL, NULL }; 543 static struct __nsw_switchconfig lkp_default = 544 { 0, "sendmail", 3, &lkp0 }; 545 546 if ((nsw_conf = __nsw_getconfig(service, &pserr)) == NULL) 547 lk = lkp_default.lookups; 548 else 549 lk = nsw_conf->lookups; 550 svcno = 0; 551 while (lk != NULL) 552 { 553 maptype[svcno] = lk->service_name; 554 if (lk->actions[__NSW_NOTFOUND] == __NSW_RETURN) 555 mapreturn[MA_NOTFOUND] |= 1 << svcno; 556 if (lk->actions[__NSW_TRYAGAIN] == __NSW_RETURN) 557 mapreturn[MA_TRYAGAIN] |= 1 << svcno; 558 if (lk->actions[__NSW_UNAVAIL] == __NSW_RETURN) 559 mapreturn[MA_TRYAGAIN] |= 1 << svcno; 560 svcno++; 561 lk = lk->next; 562 } 563 return svcno; 564 #endif 565 566 #if defined(ultrix) || defined(__osf__) 567 struct svcinfo *svcinfo; 568 int svc; 569 570 svcinfo = getsvc(); 571 if (svcinfo == NULL) 572 goto punt; 573 if (strcmp(service, "hosts") == 0) 574 svc = SVC_HOSTS; 575 else if (strcmp(service, "aliases") == 0) 576 svc = SVC_ALIASES; 577 else if (strcmp(service, "passwd") == 0) 578 svc = SVC_PASSWD; 579 else 580 return -1; 581 for (svcno = 0; svcno < SVC_PATHSIZE; svcno++) 582 { 583 switch (svcinfo->svcpath[svc][svcno]) 584 { 585 case SVC_LOCAL: 586 maptype[svcno] = "files"; 587 break; 588 589 case SVC_YP: 590 maptype[svcno] = "nis"; 591 break; 592 593 case SVC_BIND: 594 maptype[svcno] = "dns"; 595 break; 596 597 #ifdef SVC_HESIOD 598 case SVC_HESIOD: 599 maptype[svcno] = "hesiod"; 600 break; 601 #endif 602 603 case SVC_LAST: 604 return svcno; 605 } 606 } 607 return svcno; 608 #endif 609 610 #if !defined(SOLARIS) && !defined(ultrix) && !defined(__osf__) 611 /* 612 ** Fall-back mechanism. 613 */ 614 615 svcno = 0; 616 fp = fopen(ServiceSwitchFile, "r"); 617 if (fp != NULL) 618 { 619 while (fgets(buf, sizeof buf, fp) != NULL) 620 { 621 register char *p; 622 623 p = strpbrk(buf, "#\n"); 624 if (p != NULL) 625 *p = '\0'; 626 p = strpbrk(buf, " \t"); 627 if (p != NULL) 628 *p++ = '\0'; 629 if (strcmp(buf, service) != 0) 630 continue; 631 632 /* got the right service -- extract data */ 633 do 634 { 635 while (isspace(*p)) 636 p++; 637 if (*p == '\0') 638 break; 639 maptype[svcno++] = p; 640 p = strpbrk(p, " \t"); 641 if (p != NULL) 642 *p++ = '\0'; 643 } while (p != NULL); 644 break; 645 } 646 fclose(fp); 647 return svcno; 648 } 649 #endif 650 651 /* if the service file doesn't work, use an absolute fallback */ 652 punt: 653 if (strcmp(service, "aliases") == 0) 654 { 655 maptype[0] = "files"; 656 return 1; 657 } 658 if (strcmp(service, "hosts") == 0) 659 { 660 # if NAMED_BIND 661 maptype[svcno++] = "dns"; 662 # else 663 # if defined(sun) && !defined(BSD) && !defined(SOLARIS) 664 /* SunOS */ 665 maptype[svcno++] = "nis"; 666 # endif 667 # endif 668 maptype[svcno++] = "files"; 669 return svcno; 670 } 671 return -1; 672 } 673 /* 674 ** USERNAME -- return the user id of the logged in user. 675 ** 676 ** Parameters: 677 ** none. 678 ** 679 ** Returns: 680 ** The login name of the logged in user. 681 ** 682 ** Side Effects: 683 ** none. 684 ** 685 ** Notes: 686 ** The return value is statically allocated. 687 */ 688 689 char * 690 username() 691 { 692 static char *myname = NULL; 693 extern char *getlogin(); 694 register struct passwd *pw; 695 696 /* cache the result */ 697 if (myname == NULL) 698 { 699 myname = getlogin(); 700 if (myname == NULL || myname[0] == '\0') 701 { 702 pw = getpwuid(RealUid); 703 if (pw != NULL) 704 myname = newstr(pw->pw_name); 705 } 706 else 707 { 708 uid_t uid = RealUid; 709 710 myname = newstr(myname); 711 if ((pw = getpwnam(myname)) == NULL || 712 (uid != 0 && uid != pw->pw_uid)) 713 { 714 pw = getpwuid(uid); 715 if (pw != NULL) 716 myname = newstr(pw->pw_name); 717 } 718 } 719 if (myname == NULL || myname[0] == '\0') 720 { 721 syserr("554 Who are you?"); 722 myname = "postmaster"; 723 } 724 } 725 726 return (myname); 727 } 728 /* 729 ** TTYPATH -- Get the path of the user's tty 730 ** 731 ** Returns the pathname of the user's tty. Returns NULL if 732 ** the user is not logged in or if s/he has write permission 733 ** denied. 734 ** 735 ** Parameters: 736 ** none 737 ** 738 ** Returns: 739 ** pathname of the user's tty. 740 ** NULL if not logged in or write permission denied. 741 ** 742 ** Side Effects: 743 ** none. 744 ** 745 ** WARNING: 746 ** Return value is in a local buffer. 747 ** 748 ** Called By: 749 ** savemail 750 */ 751 752 char * 753 ttypath() 754 { 755 struct stat stbuf; 756 register char *pathn; 757 extern char *ttyname(); 758 extern char *getlogin(); 759 760 /* compute the pathname of the controlling tty */ 761 if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL && 762 (pathn = ttyname(0)) == NULL) 763 { 764 errno = 0; 765 return (NULL); 766 } 767 768 /* see if we have write permission */ 769 if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode)) 770 { 771 errno = 0; 772 return (NULL); 773 } 774 775 /* see if the user is logged in */ 776 if (getlogin() == NULL) 777 return (NULL); 778 779 /* looks good */ 780 return (pathn); 781 } 782 /* 783 ** CHECKCOMPAT -- check for From and To person compatible. 784 ** 785 ** This routine can be supplied on a per-installation basis 786 ** to determine whether a person is allowed to send a message. 787 ** This allows restriction of certain types of internet 788 ** forwarding or registration of users. 789 ** 790 ** If the hosts are found to be incompatible, an error 791 ** message should be given using "usrerr" and 0 should 792 ** be returned. 793 ** 794 ** EF_NORETURN can be set in e->e_flags to suppress the return-to-sender 795 ** function; this should be done on huge messages. 796 ** 797 ** Parameters: 798 ** to -- the person being sent to. 799 ** 800 ** Returns: 801 ** an exit status 802 ** 803 ** Side Effects: 804 ** none (unless you include the usrerr stuff) 805 */ 806 807 checkcompat(to, e) 808 register ADDRESS *to; 809 register ENVELOPE *e; 810 { 811 # ifdef lint 812 if (to == NULL) 813 to++; 814 # endif /* lint */ 815 816 if (tTd(49, 1)) 817 printf("checkcompat(to=%s, from=%s)\n", 818 to->q_paddr, e->e_from.q_paddr); 819 820 # ifdef EXAMPLE_CODE 821 /* this code is intended as an example only */ 822 register STAB *s; 823 824 s = stab("arpa", ST_MAILER, ST_FIND); 825 if (s != NULL && strcmp(e->e_from.q_mailer->m_name, "local") != 0 && 826 to->q_mailer == s->s_mailer) 827 { 828 usrerr("553 No ARPA mail through this machine: see your system administration"); 829 /* e->e_flags |= EF_NORETURN; to supress return copy */ 830 return (EX_UNAVAILABLE); 831 } 832 # endif /* EXAMPLE_CODE */ 833 return (EX_OK); 834 } 835 /* 836 ** SETSIGNAL -- set a signal handler 837 ** 838 ** This is essentially old BSD "signal(3)". 839 */ 840 841 sigfunc_t 842 setsignal(sig, handler) 843 int sig; 844 sigfunc_t handler; 845 { 846 #if defined(SYS5SIGNALS) || defined(BSD4_3) || defined(_AUX_SOURCE) 847 return signal(sig, handler); 848 #else 849 struct sigaction n, o; 850 851 bzero(&n, sizeof n); 852 n.sa_handler = handler; 853 # ifdef SA_RESTART 854 n.sa_flags = SA_RESTART; 855 # endif 856 if (sigaction(sig, &n, &o) < 0) 857 return SIG_ERR; 858 return o.sa_handler; 859 #endif 860 } 861 /* 862 ** HOLDSIGS -- arrange to hold all signals 863 ** 864 ** Parameters: 865 ** none. 866 ** 867 ** Returns: 868 ** none. 869 ** 870 ** Side Effects: 871 ** Arranges that signals are held. 872 */ 873 874 holdsigs() 875 { 876 } 877 /* 878 ** RLSESIGS -- arrange to release all signals 879 ** 880 ** This undoes the effect of holdsigs. 881 ** 882 ** Parameters: 883 ** none. 884 ** 885 ** Returns: 886 ** none. 887 ** 888 ** Side Effects: 889 ** Arranges that signals are released. 890 */ 891 892 rlsesigs() 893 { 894 } 895 /* 896 ** INIT_MD -- do machine dependent initializations 897 ** 898 ** Systems that have global modes that should be set should do 899 ** them here rather than in main. 900 */ 901 902 #ifdef _AUX_SOURCE 903 # include <compat.h> 904 #endif 905 906 init_md(argc, argv) 907 int argc; 908 char **argv; 909 { 910 #ifdef _AUX_SOURCE 911 setcompat(getcompat() | COMPAT_BSDPROT); 912 #endif 913 914 #ifdef VENDOR_DEFAULT 915 VendorCode = VENDOR_DEFAULT; 916 #else 917 VendorCode = VENDOR_BERKELEY; 918 #endif 919 } 920 /* 921 ** GETLA -- get the current load average 922 ** 923 ** This code stolen from la.c. 924 ** 925 ** Parameters: 926 ** none. 927 ** 928 ** Returns: 929 ** The current load average as an integer. 930 ** 931 ** Side Effects: 932 ** none. 933 */ 934 935 /* try to guess what style of load average we have */ 936 #define LA_ZERO 1 /* always return load average as zero */ 937 #define LA_INT 2 /* read kmem for avenrun; interpret as long */ 938 #define LA_FLOAT 3 /* read kmem for avenrun; interpret as float */ 939 #define LA_SUBR 4 /* call getloadavg */ 940 #define LA_MACH 5 /* MACH load averages (as on NeXT boxes) */ 941 #define LA_SHORT 6 /* read kmem for avenrun; interpret as short */ 942 #define LA_PROCSTR 7 /* read string ("1.17") from /proc/loadavg */ 943 944 /* do guesses based on general OS type */ 945 #ifndef LA_TYPE 946 # define LA_TYPE LA_ZERO 947 #endif 948 949 #if (LA_TYPE == LA_INT) || (LA_TYPE == LA_FLOAT) || (LA_TYPE == LA_SHORT) 950 951 #include <nlist.h> 952 953 #ifdef IRIX64 954 # define nlist nlist64 955 #endif 956 957 #ifndef LA_AVENRUN 958 # ifdef SYSTEM5 959 # define LA_AVENRUN "avenrun" 960 # else 961 # define LA_AVENRUN "_avenrun" 962 # endif 963 #endif 964 965 /* _PATH_UNIX should be defined in <paths.h> */ 966 #ifndef _PATH_UNIX 967 # if defined(SYSTEM5) 968 # define _PATH_UNIX "/unix" 969 # else 970 # define _PATH_UNIX "/vmunix" 971 # endif 972 #endif 973 974 struct nlist Nl[] = 975 { 976 { LA_AVENRUN }, 977 #define X_AVENRUN 0 978 { 0 }, 979 }; 980 981 #ifndef FSHIFT 982 # if defined(unixpc) 983 # define FSHIFT 5 984 # endif 985 986 # if defined(__alpha) || defined(IRIX) 987 # define FSHIFT 10 988 # endif 989 #endif 990 991 #ifndef FSHIFT 992 # define FSHIFT 8 993 #endif 994 995 #ifndef FSCALE 996 # define FSCALE (1 << FSHIFT) 997 #endif 998 999 getla() 1000 { 1001 static int kmem = -1; 1002 #if LA_TYPE == LA_INT 1003 long avenrun[3]; 1004 #else 1005 # if LA_TYPE == LA_SHORT 1006 short avenrun[3]; 1007 # else 1008 double avenrun[3]; 1009 # endif 1010 #endif 1011 extern off_t lseek(); 1012 extern int errno; 1013 1014 if (kmem < 0) 1015 { 1016 kmem = open("/dev/kmem", 0, 0); 1017 if (kmem < 0) 1018 { 1019 if (tTd(3, 1)) 1020 printf("getla: open(/dev/kmem): %s\n", 1021 errstring(errno)); 1022 return (-1); 1023 } 1024 (void) fcntl(kmem, F_SETFD, 1); 1025 if (nlist(_PATH_UNIX, Nl) < 0) 1026 { 1027 if (tTd(3, 1)) 1028 printf("getla: nlist(%s): %s\n", _PATH_UNIX, 1029 errstring(errno)); 1030 return (-1); 1031 } 1032 if (Nl[X_AVENRUN].n_value == 0) 1033 { 1034 if (tTd(3, 1)) 1035 printf("getla: nlist(%s, %s) ==> 0\n", 1036 _PATH_UNIX, LA_AVENRUN); 1037 return (-1); 1038 } 1039 #ifdef NAMELISTMASK 1040 Nl[X_AVENRUN].n_value &= NAMELISTMASK; 1041 #endif 1042 } 1043 if (tTd(3, 20)) 1044 printf("getla: symbol address = %#x\n", Nl[X_AVENRUN].n_value); 1045 if (lseek(kmem, (off_t) Nl[X_AVENRUN].n_value, 0) == -1 || 1046 read(kmem, (char *) avenrun, sizeof(avenrun)) < sizeof(avenrun)) 1047 { 1048 /* thank you Ian */ 1049 if (tTd(3, 1)) 1050 printf("getla: lseek or read: %s\n", errstring(errno)); 1051 return (-1); 1052 } 1053 #if (LA_TYPE == LA_INT) || (LA_TYPE == LA_SHORT) 1054 if (tTd(3, 5)) 1055 { 1056 printf("getla: avenrun = %d", avenrun[0]); 1057 if (tTd(3, 15)) 1058 printf(", %d, %d", avenrun[1], avenrun[2]); 1059 printf("\n"); 1060 } 1061 if (tTd(3, 1)) 1062 printf("getla: %d\n", (int) (avenrun[0] + FSCALE/2) >> FSHIFT); 1063 return ((int) (avenrun[0] + FSCALE/2) >> FSHIFT); 1064 #else 1065 if (tTd(3, 5)) 1066 { 1067 printf("getla: avenrun = %g", avenrun[0]); 1068 if (tTd(3, 15)) 1069 printf(", %g, %g", avenrun[1], avenrun[2]); 1070 printf("\n"); 1071 } 1072 if (tTd(3, 1)) 1073 printf("getla: %d\n", (int) (avenrun[0] +0.5)); 1074 return ((int) (avenrun[0] + 0.5)); 1075 #endif 1076 } 1077 1078 #else 1079 #if LA_TYPE == LA_SUBR 1080 1081 #ifdef DGUX 1082 1083 #include <sys/dg_sys_info.h> 1084 1085 int getla() 1086 { 1087 struct dg_sys_info_load_info load_info; 1088 1089 dg_sys_info((long *)&load_info, 1090 DG_SYS_INFO_LOAD_INFO_TYPE, DG_SYS_INFO_LOAD_VERSION_0); 1091 1092 if (tTd(3, 1)) 1093 printf("getla: %d\n", (int) (load_info.one_minute + 0.5)); 1094 1095 return((int) (load_info.one_minute + 0.5)); 1096 } 1097 1098 #else 1099 1100 getla() 1101 { 1102 double avenrun[3]; 1103 1104 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) < 0) 1105 { 1106 if (tTd(3, 1)) 1107 perror("getla: getloadavg failed:"); 1108 return (-1); 1109 } 1110 if (tTd(3, 1)) 1111 printf("getla: %d\n", (int) (avenrun[0] +0.5)); 1112 return ((int) (avenrun[0] + 0.5)); 1113 } 1114 1115 #endif /* DGUX */ 1116 #else 1117 #if LA_TYPE == LA_MACH 1118 1119 /* 1120 ** This has been tested on NEXTSTEP release 2.1/3.X. 1121 */ 1122 1123 #if defined(NX_CURRENT_COMPILER_RELEASE) && NX_CURRENT_COMPILER_RELEASE > NX_COMPILER_RELEASE_3_0 1124 # include <mach/mach.h> 1125 #else 1126 # include <mach.h> 1127 #endif 1128 1129 getla() 1130 { 1131 processor_set_t default_set; 1132 kern_return_t error; 1133 unsigned int info_count; 1134 struct processor_set_basic_info info; 1135 host_t host; 1136 1137 error = processor_set_default(host_self(), &default_set); 1138 if (error != KERN_SUCCESS) 1139 return -1; 1140 info_count = PROCESSOR_SET_BASIC_INFO_COUNT; 1141 if (processor_set_info(default_set, PROCESSOR_SET_BASIC_INFO, 1142 &host, (processor_set_info_t)&info, 1143 &info_count) != KERN_SUCCESS) 1144 { 1145 return -1; 1146 } 1147 return (int) (info.load_average + (LOAD_SCALE / 2)) / LOAD_SCALE; 1148 } 1149 1150 1151 #else 1152 #if LA_TYPE == LA_PROCSTR 1153 1154 /* 1155 ** Read /proc/loadavg for the load average. This is assumed to be 1156 ** in a format like "0.15 0.12 0.06". 1157 ** 1158 ** Initially intended for Linux. This has been in the kernel 1159 ** since at least 0.99.15. 1160 */ 1161 1162 # ifndef _PATH_LOADAVG 1163 # define _PATH_LOADAVG "/proc/loadavg" 1164 # endif 1165 1166 int 1167 getla() 1168 { 1169 double avenrun; 1170 register int result; 1171 FILE *fp; 1172 1173 fp = fopen(_PATH_LOADAVG, "r"); 1174 if (fp == NULL) 1175 { 1176 if (tTd(3, 1)) 1177 printf("getla: fopen(%s): %s\n", 1178 _PATH_LOADAVG, errstring(errno)); 1179 return -1; 1180 } 1181 result = fscanf(fp, "%lf", &avenrun); 1182 fclose(fp); 1183 if (result != 1) 1184 { 1185 if (tTd(3, 1)) 1186 printf("getla: fscanf() = %d: %s\n", 1187 result, errstring(errno)); 1188 return -1; 1189 } 1190 1191 if (tTd(3, 1)) 1192 printf("getla(): %.2f\n", avenrun); 1193 1194 return ((int) (avenrun + 0.5)); 1195 } 1196 1197 #else 1198 1199 getla() 1200 { 1201 if (tTd(3, 1)) 1202 printf("getla: ZERO\n"); 1203 return (0); 1204 } 1205 1206 #endif 1207 #endif 1208 #endif 1209 #endif 1210 1211 1212 /* 1213 * Copyright 1989 Massachusetts Institute of Technology 1214 * 1215 * Permission to use, copy, modify, distribute, and sell this software and its 1216 * documentation for any purpose is hereby granted without fee, provided that 1217 * the above copyright notice appear in all copies and that both that 1218 * copyright notice and this permission notice appear in supporting 1219 * documentation, and that the name of M.I.T. not be used in advertising or 1220 * publicity pertaining to distribution of the software without specific, 1221 * written prior permission. M.I.T. makes no representations about the 1222 * suitability of this software for any purpose. It is provided "as is" 1223 * without express or implied warranty. 1224 * 1225 * M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL 1226 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T. 1227 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 1228 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 1229 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 1230 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 1231 * 1232 * Authors: Many and varied... 1233 */ 1234 1235 /* Non Apollo stuff removed by Don Lewis 11/15/93 */ 1236 #ifndef lint 1237 static char rcsid[] = "@(#)$Id: getloadavg.c,v 1.16 1991/06/21 12:51:15 paul Exp $"; 1238 #endif /* !lint */ 1239 1240 #ifdef apollo 1241 # undef volatile 1242 # include <apollo/base.h> 1243 1244 /* ARGSUSED */ 1245 int getloadavg( call_data ) 1246 caddr_t call_data; /* pointer to (double) return value */ 1247 { 1248 double *avenrun = (double *) call_data; 1249 int i; 1250 status_$t st; 1251 long loadav[3]; 1252 proc1_$get_loadav(loadav, &st); 1253 *avenrun = loadav[0] / (double) (1 << 16); 1254 return(0); 1255 } 1256 # endif /* apollo */ 1257 /* 1258 ** SHOULDQUEUE -- should this message be queued or sent? 1259 ** 1260 ** Compares the message cost to the load average to decide. 1261 ** 1262 ** Parameters: 1263 ** pri -- the priority of the message in question. 1264 ** ctime -- the message creation time. 1265 ** 1266 ** Returns: 1267 ** TRUE -- if this message should be queued up for the 1268 ** time being. 1269 ** FALSE -- if the load is low enough to send this message. 1270 ** 1271 ** Side Effects: 1272 ** none. 1273 */ 1274 1275 bool 1276 shouldqueue(pri, ctime) 1277 long pri; 1278 time_t ctime; 1279 { 1280 bool rval; 1281 1282 if (tTd(3, 30)) 1283 printf("shouldqueue: CurrentLA=%d, pri=%d: ", CurrentLA, pri); 1284 if (CurrentLA < QueueLA) 1285 { 1286 if (tTd(3, 30)) 1287 printf("FALSE (CurrentLA < QueueLA)\n"); 1288 return (FALSE); 1289 } 1290 if (CurrentLA >= RefuseLA) 1291 { 1292 if (tTd(3, 30)) 1293 printf("TRUE (CurrentLA >= RefuseLA)\n"); 1294 return (TRUE); 1295 } 1296 rval = pri > (QueueFactor / (CurrentLA - QueueLA + 1)); 1297 if (tTd(3, 30)) 1298 printf("%s (by calculation)\n", rval ? "TRUE" : "FALSE"); 1299 return rval; 1300 } 1301 /* 1302 ** REFUSECONNECTIONS -- decide if connections should be refused 1303 ** 1304 ** Parameters: 1305 ** none. 1306 ** 1307 ** Returns: 1308 ** TRUE if incoming SMTP connections should be refused 1309 ** (for now). 1310 ** FALSE if we should accept new work. 1311 ** 1312 ** Side Effects: 1313 ** none. 1314 */ 1315 1316 bool 1317 refuseconnections() 1318 { 1319 #ifdef XLA 1320 if (!xla_smtp_ok()) 1321 return TRUE; 1322 #endif 1323 1324 /* this is probably too simplistic */ 1325 return (CurrentLA >= RefuseLA); 1326 } 1327 /* 1328 ** SETPROCTITLE -- set process title for ps 1329 ** 1330 ** Parameters: 1331 ** fmt -- a printf style format string. 1332 ** a, b, c -- possible parameters to fmt. 1333 ** 1334 ** Returns: 1335 ** none. 1336 ** 1337 ** Side Effects: 1338 ** Clobbers argv of our main procedure so ps(1) will 1339 ** display the title. 1340 */ 1341 1342 #define SPT_NONE 0 /* don't use it at all */ 1343 #define SPT_REUSEARGV 1 /* cover argv with title information */ 1344 #define SPT_BUILTIN 2 /* use libc builtin */ 1345 #define SPT_PSTAT 3 /* use pstat(PSTAT_SETCMD, ...) */ 1346 #define SPT_PSSTRINGS 4 /* use PS_STRINGS->... */ 1347 #define SPT_WRITEUDOT 5 /* write u. area in kmem */ 1348 1349 #ifndef SPT_TYPE 1350 # define SPT_TYPE SPT_REUSEARGV 1351 #endif 1352 1353 #if SPT_TYPE != SPT_NONE && SPT_TYPE != SPT_BUILTIN 1354 1355 # if SPT_TYPE == SPT_PSTAT 1356 # include <sys/pstat.h> 1357 # endif 1358 # if SPT_TYPE == SPT_PSSTRINGS 1359 # include <machine/vmparam.h> 1360 # include <sys/exec.h> 1361 # ifndef PS_STRINGS /* hmmmm.... apparently not available after all */ 1362 # undef SPT_TYPE 1363 # define SPT_TYPE SPT_REUSEARGV 1364 # endif 1365 # endif 1366 1367 # if SPT_TYPE == SPT_PSSTRINGS 1368 # define SETPROC_STATIC static 1369 # else 1370 # define SETPROC_STATIC 1371 # endif 1372 1373 # ifndef SPT_PADCHAR 1374 # define SPT_PADCHAR ' ' 1375 # endif 1376 1377 #endif /* SPT_TYPE != SPT_NONE && SPT_TYPE != SPT_BUILTIN */ 1378 1379 #if SPT_TYPE != SPT_BUILTIN 1380 1381 /*VARARGS1*/ 1382 # ifdef __STDC__ 1383 setproctitle(char *fmt, ...) 1384 # else 1385 setproctitle(fmt, va_alist) 1386 char *fmt; 1387 va_dcl 1388 # endif 1389 { 1390 # if SPT_TYPE != SPT_NONE 1391 register char *p; 1392 register int i; 1393 SETPROC_STATIC char buf[MAXLINE]; 1394 VA_LOCAL_DECL 1395 # if SPT_TYPE == SPT_PSTAT 1396 union pstun pst; 1397 # endif 1398 extern char **Argv; 1399 extern char *LastArgv; 1400 1401 p = buf; 1402 1403 /* print sendmail: heading for grep */ 1404 (void) strcpy(p, "sendmail: "); 1405 p += strlen(p); 1406 1407 /* print the argument string */ 1408 VA_START(fmt); 1409 (void) vsprintf(p, fmt, ap); 1410 VA_END; 1411 1412 i = strlen(buf); 1413 1414 # if SPT_TYPE == SPT_PSTAT 1415 pst.pst_command = buf; 1416 pstat(PSTAT_SETCMD, pst, i, 0, 0); 1417 # else 1418 # if SPT_TYPE == SPT_PSSTRINGS 1419 PS_STRINGS->ps_nargvstr = 1; 1420 PS_STRINGS->ps_argvstr = buf; 1421 # else 1422 if (i > LastArgv - Argv[0] - 2) 1423 { 1424 i = LastArgv - Argv[0] - 2; 1425 buf[i] = '\0'; 1426 } 1427 (void) strcpy(Argv[0], buf); 1428 p = &Argv[0][i]; 1429 while (p < LastArgv) 1430 *p++ = SPT_PADCHAR; 1431 Argv[1] = NULL; 1432 # endif /* SPT_TYPE == SPT_PSSTRINGS */ 1433 # endif /* SPT_TYPE == SPT_PSTAT */ 1434 # endif /* SPT_TYPE != SPT_NONE */ 1435 } 1436 1437 #endif /* SPT_TYPE != SPT_BUILTIN */ 1438 /* 1439 ** REAPCHILD -- pick up the body of my child, lest it become a zombie 1440 ** 1441 ** Parameters: 1442 ** none. 1443 ** 1444 ** Returns: 1445 ** none. 1446 ** 1447 ** Side Effects: 1448 ** Picks up extant zombies. 1449 */ 1450 1451 void 1452 reapchild() 1453 { 1454 int olderrno = errno; 1455 # ifdef HASWAITPID 1456 auto int status; 1457 int count; 1458 int pid; 1459 1460 count = 0; 1461 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) 1462 { 1463 if (count++ > 1000) 1464 { 1465 #ifdef LOG 1466 syslog(LOG_ALERT, "reapchild: waitpid loop: pid=%d, status=%x", 1467 pid, status); 1468 #endif 1469 break; 1470 } 1471 } 1472 # else 1473 # ifdef WNOHANG 1474 union wait status; 1475 1476 while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0) 1477 continue; 1478 # else /* WNOHANG */ 1479 auto int status; 1480 1481 while (wait(&status) > 0) 1482 continue; 1483 # endif /* WNOHANG */ 1484 # endif 1485 # ifdef SYS5SIGNALS 1486 (void) setsignal(SIGCHLD, reapchild); 1487 # endif 1488 errno = olderrno; 1489 } 1490 /* 1491 ** UNSETENV -- remove a variable from the environment 1492 ** 1493 ** Not needed on newer systems. 1494 ** 1495 ** Parameters: 1496 ** name -- the string name of the environment variable to be 1497 ** deleted from the current environment. 1498 ** 1499 ** Returns: 1500 ** none. 1501 ** 1502 ** Globals: 1503 ** environ -- a pointer to the current environment. 1504 ** 1505 ** Side Effects: 1506 ** Modifies environ. 1507 */ 1508 1509 #ifndef HASUNSETENV 1510 1511 void 1512 unsetenv(name) 1513 char *name; 1514 { 1515 extern char **environ; 1516 register char **pp; 1517 int len = strlen(name); 1518 1519 for (pp = environ; *pp != NULL; pp++) 1520 { 1521 if (strncmp(name, *pp, len) == 0 && 1522 ((*pp)[len] == '=' || (*pp)[len] == '\0')) 1523 break; 1524 } 1525 1526 for (; *pp != NULL; pp++) 1527 *pp = pp[1]; 1528 } 1529 1530 #endif 1531 /* 1532 ** GETDTABLESIZE -- return number of file descriptors 1533 ** 1534 ** Only on non-BSD systems 1535 ** 1536 ** Parameters: 1537 ** none 1538 ** 1539 ** Returns: 1540 ** size of file descriptor table 1541 ** 1542 ** Side Effects: 1543 ** none 1544 */ 1545 1546 #ifdef SOLARIS 1547 # include <sys/resource.h> 1548 #endif 1549 1550 int 1551 getdtsize() 1552 { 1553 #ifdef RLIMIT_NOFILE 1554 struct rlimit rl; 1555 1556 if (getrlimit(RLIMIT_NOFILE, &rl) >= 0) 1557 return rl.rlim_cur; 1558 #endif 1559 1560 # ifdef HASGETDTABLESIZE 1561 return getdtablesize(); 1562 # else 1563 # ifdef _SC_OPEN_MAX 1564 return sysconf(_SC_OPEN_MAX); 1565 # else 1566 return NOFILE; 1567 # endif 1568 # endif 1569 } 1570 /* 1571 ** UNAME -- get the UUCP name of this system. 1572 */ 1573 1574 #ifndef HASUNAME 1575 1576 int 1577 uname(name) 1578 struct utsname *name; 1579 { 1580 FILE *file; 1581 char *n; 1582 1583 name->nodename[0] = '\0'; 1584 1585 /* try /etc/whoami -- one line with the node name */ 1586 if ((file = fopen("/etc/whoami", "r")) != NULL) 1587 { 1588 (void) fgets(name->nodename, NODE_LENGTH + 1, file); 1589 (void) fclose(file); 1590 n = strchr(name->nodename, '\n'); 1591 if (n != NULL) 1592 *n = '\0'; 1593 if (name->nodename[0] != '\0') 1594 return (0); 1595 } 1596 1597 /* try /usr/include/whoami.h -- has a #define somewhere */ 1598 if ((file = fopen("/usr/include/whoami.h", "r")) != NULL) 1599 { 1600 char buf[MAXLINE]; 1601 1602 while (fgets(buf, MAXLINE, file) != NULL) 1603 if (sscanf(buf, "#define sysname \"%*[^\"]\"", 1604 NODE_LENGTH, name->nodename) > 0) 1605 break; 1606 (void) fclose(file); 1607 if (name->nodename[0] != '\0') 1608 return (0); 1609 } 1610 1611 #ifdef TRUST_POPEN 1612 /* 1613 ** Popen is known to have security holes. 1614 */ 1615 1616 /* try uuname -l to return local name */ 1617 if ((file = popen("uuname -l", "r")) != NULL) 1618 { 1619 (void) fgets(name, NODE_LENGTH + 1, file); 1620 (void) pclose(file); 1621 n = strchr(name, '\n'); 1622 if (n != NULL) 1623 *n = '\0'; 1624 if (name->nodename[0] != '\0') 1625 return (0); 1626 } 1627 #endif 1628 1629 return (-1); 1630 } 1631 #endif /* HASUNAME */ 1632 /* 1633 ** INITGROUPS -- initialize groups 1634 ** 1635 ** Stub implementation for System V style systems 1636 */ 1637 1638 #ifndef HASINITGROUPS 1639 1640 initgroups(name, basegid) 1641 char *name; 1642 int basegid; 1643 { 1644 return 0; 1645 } 1646 1647 #endif 1648 /* 1649 ** SETSID -- set session id (for non-POSIX systems) 1650 */ 1651 1652 #ifndef HASSETSID 1653 1654 pid_t 1655 setsid __P ((void)) 1656 { 1657 #ifdef TIOCNOTTY 1658 int fd; 1659 1660 fd = open("/dev/tty", O_RDWR, 0); 1661 if (fd >= 0) 1662 { 1663 (void) ioctl(fd, (int) TIOCNOTTY, (char *) 0); 1664 (void) close(fd); 1665 } 1666 #endif /* TIOCNOTTY */ 1667 # ifdef SYS5SETPGRP 1668 return setpgrp(); 1669 # else 1670 return setpgid(0, getpid()); 1671 # endif 1672 } 1673 1674 #endif 1675 /* 1676 ** FSYNC -- dummy fsync 1677 */ 1678 1679 #ifdef NEEDFSYNC 1680 1681 fsync(fd) 1682 int fd; 1683 { 1684 # ifdef O_SYNC 1685 return fcntl(fd, F_SETFL, O_SYNC); 1686 # else 1687 /* nothing we can do */ 1688 return 0; 1689 # endif 1690 } 1691 1692 #endif 1693 /* 1694 ** DGUX_INET_ADDR -- inet_addr for DG/UX 1695 ** 1696 ** Data General DG/UX version of inet_addr returns a struct in_addr 1697 ** instead of a long. This patches things. Only needed on versions 1698 ** prior to 5.4.3. 1699 */ 1700 1701 #ifdef DGUX_5_4_2 1702 1703 #undef inet_addr 1704 1705 long 1706 dgux_inet_addr(host) 1707 char *host; 1708 { 1709 struct in_addr haddr; 1710 1711 haddr = inet_addr(host); 1712 return haddr.s_addr; 1713 } 1714 1715 #endif 1716 /* 1717 ** GETOPT -- for old systems or systems with bogus implementations 1718 */ 1719 1720 #ifdef NEEDGETOPT 1721 1722 /* 1723 * Copyright (c) 1985 Regents of the University of California. 1724 * All rights reserved. The Berkeley software License Agreement 1725 * specifies the terms and conditions for redistribution. 1726 */ 1727 1728 1729 /* 1730 ** this version hacked to add `atend' flag to allow state machine 1731 ** to reset if invoked by the program to scan args for a 2nd time 1732 */ 1733 1734 #if defined(LIBC_SCCS) && !defined(lint) 1735 static char sccsid[] = "@(#)getopt.c 4.3 (Berkeley) 3/9/86"; 1736 #endif /* LIBC_SCCS and not lint */ 1737 1738 #include <stdio.h> 1739 1740 /* 1741 * get option letter from argument vector 1742 */ 1743 #ifdef _CONVEX_SOURCE 1744 extern int optind, opterr; 1745 #else 1746 int opterr = 1; /* if error message should be printed */ 1747 int optind = 1; /* index into parent argv vector */ 1748 #endif 1749 int optopt; /* character checked for validity */ 1750 char *optarg; /* argument associated with option */ 1751 1752 #define BADCH (int)'?' 1753 #define EMSG "" 1754 #define tell(s) if (opterr) {fputs(*nargv,stderr);fputs(s,stderr); \ 1755 fputc(optopt,stderr);fputc('\n',stderr);return(BADCH);} 1756 1757 getopt(nargc,nargv,ostr) 1758 int nargc; 1759 char *const *nargv; 1760 const char *ostr; 1761 { 1762 static char *place = EMSG; /* option letter processing */ 1763 static char atend = 0; 1764 register char *oli; /* option letter list index */ 1765 1766 if (atend) { 1767 atend = 0; 1768 place = EMSG; 1769 } 1770 if(!*place) { /* update scanning pointer */ 1771 if (optind >= nargc || *(place = nargv[optind]) != '-' || !*++place) { 1772 atend++; 1773 return(EOF); 1774 } 1775 if (*place == '-') { /* found "--" */ 1776 ++optind; 1777 atend++; 1778 return(EOF); 1779 } 1780 } /* option letter okay? */ 1781 if ((optopt = (int)*place++) == (int)':' || !(oli = strchr(ostr,optopt))) { 1782 if (!*place) ++optind; 1783 tell(": illegal option -- "); 1784 } 1785 if (*++oli != ':') { /* don't need argument */ 1786 optarg = NULL; 1787 if (!*place) ++optind; 1788 } 1789 else { /* need an argument */ 1790 if (*place) optarg = place; /* no white space */ 1791 else if (nargc <= ++optind) { /* no arg */ 1792 place = EMSG; 1793 tell(": option requires an argument -- "); 1794 } 1795 else optarg = nargv[optind]; /* white space */ 1796 place = EMSG; 1797 ++optind; 1798 } 1799 return(optopt); /* dump back option letter */ 1800 } 1801 1802 #endif 1803 /* 1804 ** VFPRINTF, VSPRINTF -- for old 4.3 BSD systems missing a real version 1805 */ 1806 1807 #ifdef NEEDVPRINTF 1808 1809 #define MAXARG 16 1810 1811 vfprintf(fp, fmt, ap) 1812 FILE * fp; 1813 char * fmt; 1814 char ** ap; 1815 { 1816 char * bp[MAXARG]; 1817 int i = 0; 1818 1819 while (*ap && i < MAXARG) 1820 bp[i++] = *ap++; 1821 fprintf(fp, fmt, bp[0], bp[1], bp[2], bp[3], 1822 bp[4], bp[5], bp[6], bp[7], 1823 bp[8], bp[9], bp[10], bp[11], 1824 bp[12], bp[13], bp[14], bp[15]); 1825 } 1826 1827 vsprintf(s, fmt, ap) 1828 char * s; 1829 char * fmt; 1830 char ** ap; 1831 { 1832 char * bp[MAXARG]; 1833 int i = 0; 1834 1835 while (*ap && i < MAXARG) 1836 bp[i++] = *ap++; 1837 sprintf(s, fmt, bp[0], bp[1], bp[2], bp[3], 1838 bp[4], bp[5], bp[6], bp[7], 1839 bp[8], bp[9], bp[10], bp[11], 1840 bp[12], bp[13], bp[14], bp[15]); 1841 } 1842 1843 #endif 1844 /* 1845 ** USERSHELLOK -- tell if a user's shell is ok for unrestricted use 1846 ** 1847 ** Parameters: 1848 ** shell -- the user's shell from /etc/passwd 1849 ** 1850 ** Returns: 1851 ** TRUE -- if it is ok to use this for unrestricted access. 1852 ** FALSE -- if the shell is restricted. 1853 */ 1854 1855 #if !HASGETUSERSHELL 1856 1857 # ifndef _PATH_SHELLS 1858 # define _PATH_SHELLS "/etc/shells" 1859 # endif 1860 1861 char *DefaultUserShells[] = 1862 { 1863 "/bin/sh", 1864 "/usr/bin/sh", 1865 "/bin/csh", 1866 "/usr/bin/csh", 1867 #ifdef __hpux 1868 "/bin/rsh", 1869 "/bin/ksh", 1870 "/bin/rksh", 1871 "/bin/pam", 1872 "/usr/bin/keysh", 1873 "/bin/posix/sh", 1874 #endif 1875 NULL 1876 }; 1877 1878 #endif 1879 1880 #define WILDCARD_SHELL "/SENDMAIL/ANY/SHELL/" 1881 1882 bool 1883 usershellok(shell) 1884 char *shell; 1885 { 1886 #if HASGETUSERSHELL 1887 register char *p; 1888 extern char *getusershell(); 1889 1890 setusershell(); 1891 while ((p = getusershell()) != NULL) 1892 if (strcmp(p, shell) == 0 || strcmp(p, WILDCARD_SHELL) == 0) 1893 break; 1894 endusershell(); 1895 return p != NULL; 1896 #else 1897 register FILE *shellf; 1898 char buf[MAXLINE]; 1899 1900 shellf = fopen(_PATH_SHELLS, "r"); 1901 if (shellf == NULL) 1902 { 1903 /* no /etc/shells; see if it is one of the std shells */ 1904 char **d; 1905 1906 for (d = DefaultUserShells; *d != NULL; d++) 1907 { 1908 if (strcmp(shell, *d) == 0) 1909 return TRUE; 1910 } 1911 return FALSE; 1912 } 1913 1914 while (fgets(buf, sizeof buf, shellf) != NULL) 1915 { 1916 register char *p, *q; 1917 1918 p = buf; 1919 while (*p != '\0' && *p != '#' && *p != '/') 1920 p++; 1921 if (*p == '#' || *p == '\0') 1922 continue; 1923 q = p; 1924 while (*p != '\0' && *p != '#' && !isspace(*p)) 1925 p++; 1926 *p = '\0'; 1927 if (strcmp(shell, q) == 0 || strcmp(WILDCARD_SHELL, q) == 0) 1928 { 1929 fclose(shellf); 1930 return TRUE; 1931 } 1932 } 1933 fclose(shellf); 1934 return FALSE; 1935 #endif 1936 } 1937 /* 1938 ** FREESPACE -- see how much free space is on the queue filesystem 1939 ** 1940 ** Only implemented if you have statfs. 1941 ** 1942 ** Parameters: 1943 ** dir -- the directory in question. 1944 ** bsize -- a variable into which the filesystem 1945 ** block size is stored. 1946 ** 1947 ** Returns: 1948 ** The number of bytes free on the queue filesystem. 1949 ** -1 if the statfs call fails. 1950 ** 1951 ** Side effects: 1952 ** Puts the filesystem block size into bsize. 1953 */ 1954 1955 /* statfs types */ 1956 #define SFS_NONE 0 /* no statfs implementation */ 1957 #define SFS_USTAT 1 /* use ustat */ 1958 #define SFS_4ARGS 2 /* use four-argument statfs call */ 1959 #define SFS_VFS 3 /* use <sys/vfs.h> implementation */ 1960 #define SFS_MOUNT 4 /* use <sys/mount.h> implementation */ 1961 #define SFS_STATFS 5 /* use <sys/statfs.h> implementation */ 1962 #define SFS_STATVFS 6 /* use <sys/statvfs.h> implementation */ 1963 1964 #ifndef SFS_TYPE 1965 # define SFS_TYPE SFS_NONE 1966 #endif 1967 1968 #if SFS_TYPE == SFS_USTAT 1969 # include <ustat.h> 1970 #endif 1971 #if SFS_TYPE == SFS_4ARGS || SFS_TYPE == SFS_STATFS 1972 # include <sys/statfs.h> 1973 #endif 1974 #if SFS_TYPE == SFS_VFS 1975 # include <sys/vfs.h> 1976 #endif 1977 #if SFS_TYPE == SFS_MOUNT 1978 # include <sys/mount.h> 1979 #endif 1980 #if SFS_TYPE == SFS_STATVFS 1981 # include <sys/statvfs.h> 1982 #endif 1983 1984 long 1985 freespace(dir, bsize) 1986 char *dir; 1987 long *bsize; 1988 { 1989 #if SFS_TYPE != SFS_NONE 1990 # if SFS_TYPE == SFS_USTAT 1991 struct ustat fs; 1992 struct stat statbuf; 1993 # define FSBLOCKSIZE DEV_BSIZE 1994 # define f_bavail f_tfree 1995 # else 1996 # if defined(ultrix) 1997 struct fs_data fs; 1998 # define f_bavail fd_bfreen 1999 # define FSBLOCKSIZE 1024L 2000 # else 2001 # if SFS_TYPE == SFS_STATVFS 2002 struct statvfs fs; 2003 # define FSBLOCKSIZE fs.f_bsize 2004 # else 2005 struct statfs fs; 2006 # define FSBLOCKSIZE fs.f_bsize 2007 # if defined(_SCO_unix_) || defined(IRIX) || defined(apollo) || defined(ALTOS_SYS_V) || defined(_UTS) 2008 # define f_bavail f_bfree 2009 # endif 2010 # endif 2011 # endif 2012 # endif 2013 extern int errno; 2014 2015 # if SFS_TYPE == SFS_USTAT 2016 if (stat(dir, &statbuf) == 0 && ustat(statbuf.st_dev, &fs) == 0) 2017 # else 2018 # if SFS_TYPE == SFS_4ARGS 2019 if (statfs(dir, &fs, sizeof fs, 0) == 0) 2020 # else 2021 # if SFS_TYPE == SFS_STATVFS 2022 if (statvfs(dir, &fs) == 0) 2023 # else 2024 # if defined(ultrix) 2025 if (statfs(dir, &fs) > 0) 2026 # else 2027 if (statfs(dir, &fs) == 0) 2028 # endif 2029 # endif 2030 # endif 2031 # endif 2032 { 2033 if (bsize != NULL) 2034 *bsize = FSBLOCKSIZE; 2035 return (fs.f_bavail); 2036 } 2037 #endif 2038 return (-1); 2039 } 2040 /* 2041 ** ENOUGHSPACE -- check to see if there is enough free space on the queue fs 2042 ** 2043 ** Only implemented if you have statfs. 2044 ** 2045 ** Parameters: 2046 ** msize -- the size to check against. If zero, we don't yet 2047 ** know how big the message will be, so just check for 2048 ** a "reasonable" amount. 2049 ** 2050 ** Returns: 2051 ** TRUE if there is enough space. 2052 ** FALSE otherwise. 2053 */ 2054 2055 bool 2056 enoughspace(msize) 2057 long msize; 2058 { 2059 long bfree, bsize; 2060 2061 if (MinBlocksFree <= 0 && msize <= 0) 2062 { 2063 if (tTd(4, 80)) 2064 printf("enoughspace: no threshold\n"); 2065 return TRUE; 2066 } 2067 2068 if ((bfree = freespace(QueueDir, &bsize)) >= 0) 2069 { 2070 if (tTd(4, 80)) 2071 printf("enoughspace: bavail=%ld, need=%ld\n", 2072 bfree, msize); 2073 2074 /* convert msize to block count */ 2075 msize = msize / bsize + 1; 2076 if (MinBlocksFree >= 0) 2077 msize += MinBlocksFree; 2078 2079 if (bfree < msize) 2080 { 2081 #ifdef LOG 2082 if (LogLevel > 0) 2083 syslog(LOG_ALERT, 2084 "%s: low on space (have %ld, %s needs %ld in %s)", 2085 CurEnv->e_id, bfree, 2086 CurHostName, msize, QueueDir); 2087 #endif 2088 return FALSE; 2089 } 2090 } 2091 else if (tTd(4, 80)) 2092 printf("enoughspace failure: min=%ld, need=%ld: %s\n", 2093 MinBlocksFree, msize, errstring(errno)); 2094 return TRUE; 2095 } 2096 /* 2097 ** TRANSIENTERROR -- tell if an error code indicates a transient failure 2098 ** 2099 ** This looks at an errno value and tells if this is likely to 2100 ** go away if retried later. 2101 ** 2102 ** Parameters: 2103 ** err -- the errno code to classify. 2104 ** 2105 ** Returns: 2106 ** TRUE if this is probably transient. 2107 ** FALSE otherwise. 2108 */ 2109 2110 bool 2111 transienterror(err) 2112 int err; 2113 { 2114 switch (err) 2115 { 2116 case EIO: /* I/O error */ 2117 case ENXIO: /* Device not configured */ 2118 case EAGAIN: /* Resource temporarily unavailable */ 2119 case ENOMEM: /* Cannot allocate memory */ 2120 case ENODEV: /* Operation not supported by device */ 2121 case ENFILE: /* Too many open files in system */ 2122 case EMFILE: /* Too many open files */ 2123 case ENOSPC: /* No space left on device */ 2124 #ifdef ETIMEDOUT 2125 case ETIMEDOUT: /* Connection timed out */ 2126 #endif 2127 #ifdef ESTALE 2128 case ESTALE: /* Stale NFS file handle */ 2129 #endif 2130 #ifdef ENETDOWN 2131 case ENETDOWN: /* Network is down */ 2132 #endif 2133 #ifdef ENETUNREACH 2134 case ENETUNREACH: /* Network is unreachable */ 2135 #endif 2136 #ifdef ENETRESET 2137 case ENETRESET: /* Network dropped connection on reset */ 2138 #endif 2139 #ifdef ECONNABORTED 2140 case ECONNABORTED: /* Software caused connection abort */ 2141 #endif 2142 #ifdef ECONNRESET 2143 case ECONNRESET: /* Connection reset by peer */ 2144 #endif 2145 #ifdef ENOBUFS 2146 case ENOBUFS: /* No buffer space available */ 2147 #endif 2148 #ifdef ESHUTDOWN 2149 case ESHUTDOWN: /* Can't send after socket shutdown */ 2150 #endif 2151 #ifdef ECONNREFUSED 2152 case ECONNREFUSED: /* Connection refused */ 2153 #endif 2154 #ifdef EHOSTDOWN 2155 case EHOSTDOWN: /* Host is down */ 2156 #endif 2157 #ifdef EHOSTUNREACH 2158 case EHOSTUNREACH: /* No route to host */ 2159 #endif 2160 #ifdef EDQUOT 2161 case EDQUOT: /* Disc quota exceeded */ 2162 #endif 2163 #ifdef EPROCLIM 2164 case EPROCLIM: /* Too many processes */ 2165 #endif 2166 #ifdef EUSERS 2167 case EUSERS: /* Too many users */ 2168 #endif 2169 #ifdef EDEADLK 2170 case EDEADLK: /* Resource deadlock avoided */ 2171 #endif 2172 #ifdef EISCONN 2173 case EISCONN: /* Socket already connected */ 2174 #endif 2175 #ifdef EINPROGRESS 2176 case EINPROGRESS: /* Operation now in progress */ 2177 #endif 2178 #ifdef EALREADY 2179 case EALREADY: /* Operation already in progress */ 2180 #endif 2181 #ifdef EADDRINUSE 2182 case EADDRINUSE: /* Address already in use */ 2183 #endif 2184 #ifdef EADDRNOTAVAIL 2185 case EADDRNOTAVAIL: /* Can't assign requested address */ 2186 #endif 2187 #ifdef ETXTBSY 2188 case ETXTBSY: /* (Apollo) file locked */ 2189 #endif 2190 #if defined(ENOSR) && (!defined(ENOBUFS) || (ENOBUFS != ENOSR)) 2191 case ENOSR: /* Out of streams resources */ 2192 #endif 2193 return TRUE; 2194 } 2195 2196 /* nope, must be permanent */ 2197 return FALSE; 2198 } 2199 /* 2200 ** LOCKFILE -- lock a file using flock or (shudder) fcntl locking 2201 ** 2202 ** Parameters: 2203 ** fd -- the file descriptor of the file. 2204 ** filename -- the file name (for error messages). 2205 ** ext -- the filename extension. 2206 ** type -- type of the lock. Bits can be: 2207 ** LOCK_EX -- exclusive lock. 2208 ** LOCK_NB -- non-blocking. 2209 ** 2210 ** Returns: 2211 ** TRUE if the lock was acquired. 2212 ** FALSE otherwise. 2213 */ 2214 2215 bool 2216 lockfile(fd, filename, ext, type) 2217 int fd; 2218 char *filename; 2219 char *ext; 2220 int type; 2221 { 2222 # if !HASFLOCK 2223 int action; 2224 struct flock lfd; 2225 2226 if (ext == NULL) 2227 ext = ""; 2228 2229 bzero(&lfd, sizeof lfd); 2230 if (bitset(LOCK_UN, type)) 2231 lfd.l_type = F_UNLCK; 2232 else if (bitset(LOCK_EX, type)) 2233 lfd.l_type = F_WRLCK; 2234 else 2235 lfd.l_type = F_RDLCK; 2236 2237 if (bitset(LOCK_NB, type)) 2238 action = F_SETLK; 2239 else 2240 action = F_SETLKW; 2241 2242 if (tTd(55, 60)) 2243 printf("lockfile(%s%s, action=%d, type=%d): ", 2244 filename, ext, action, lfd.l_type); 2245 2246 if (fcntl(fd, action, &lfd) >= 0) 2247 { 2248 if (tTd(55, 60)) 2249 printf("SUCCESS\n"); 2250 return TRUE; 2251 } 2252 2253 if (tTd(55, 60)) 2254 printf("(%s) ", errstring(errno)); 2255 2256 /* 2257 ** On SunOS, if you are testing using -oQ/tmp/mqueue or 2258 ** -oA/tmp/aliases or anything like that, and /tmp is mounted 2259 ** as type "tmp" (that is, served from swap space), the 2260 ** previous fcntl will fail with "Invalid argument" errors. 2261 ** Since this is fairly common during testing, we will assume 2262 ** that this indicates that the lock is successfully grabbed. 2263 */ 2264 2265 if (errno == EINVAL) 2266 { 2267 if (tTd(55, 60)) 2268 printf("SUCCESS\n"); 2269 return TRUE; 2270 } 2271 2272 if (!bitset(LOCK_NB, type) || (errno != EACCES && errno != EAGAIN)) 2273 { 2274 int omode = -1; 2275 # ifdef F_GETFL 2276 int oerrno = errno; 2277 2278 (void) fcntl(fd, F_GETFL, &omode); 2279 errno = oerrno; 2280 # endif 2281 syserr("cannot lockf(%s%s, fd=%d, type=%o, omode=%o, euid=%d)", 2282 filename, ext, fd, type, omode, geteuid()); 2283 } 2284 # else 2285 if (ext == NULL) 2286 ext = ""; 2287 2288 if (tTd(55, 60)) 2289 printf("lockfile(%s%s, type=%o): ", filename, ext, type); 2290 2291 if (flock(fd, type) >= 0) 2292 { 2293 if (tTd(55, 60)) 2294 printf("SUCCESS\n"); 2295 return TRUE; 2296 } 2297 2298 if (tTd(55, 60)) 2299 printf("(%s) ", errstring(errno)); 2300 2301 if (!bitset(LOCK_NB, type) || errno != EWOULDBLOCK) 2302 { 2303 int omode = -1; 2304 # ifdef F_GETFL 2305 int oerrno = errno; 2306 2307 (void) fcntl(fd, F_GETFL, &omode); 2308 errno = oerrno; 2309 # endif 2310 syserr("cannot flock(%s%s, fd=%d, type=%o, omode=%o, euid=%d)", 2311 filename, ext, fd, type, omode, geteuid()); 2312 } 2313 # endif 2314 if (tTd(55, 60)) 2315 printf("FAIL\n"); 2316 return FALSE; 2317 } 2318 /* 2319 ** CHOWNSAFE -- tell if chown is "safe" (executable only by root) 2320 ** 2321 ** Parameters: 2322 ** fd -- the file descriptor to check. 2323 ** 2324 ** Returns: 2325 ** TRUE -- if only root can chown the file to an arbitrary 2326 ** user. 2327 ** FALSE -- if an arbitrary user can give away a file. 2328 */ 2329 2330 bool 2331 chownsafe(fd) 2332 int fd; 2333 { 2334 #ifdef __hpux 2335 char *s; 2336 int tfd; 2337 uid_t o_uid, o_euid; 2338 gid_t o_gid, o_egid; 2339 bool rval; 2340 struct stat stbuf; 2341 2342 o_uid = getuid(); 2343 o_euid = geteuid(); 2344 o_gid = getgid(); 2345 o_egid = getegid(); 2346 fstat(fd, &stbuf); 2347 setresuid(stbuf.st_uid, stbuf.st_uid, -1); 2348 setresgid(stbuf.st_gid, stbuf.st_gid, -1); 2349 s = tmpnam(NULL); 2350 tfd = open(s, O_RDONLY|O_CREAT, 0600); 2351 rval = fchown(tfd, DefUid, DefGid) != 0; 2352 close(tfd); 2353 unlink(s); 2354 setreuid(o_uid, o_euid); 2355 setresgid(o_gid, o_egid, -1); 2356 return rval; 2357 #else 2358 # ifdef _POSIX_CHOWN_RESTRICTED 2359 # if _POSIX_CHOWN_RESTRICTED == -1 2360 return FALSE; 2361 # else 2362 return TRUE; 2363 # endif 2364 # else 2365 # ifdef _PC_CHOWN_RESTRICTED 2366 int rval; 2367 2368 /* 2369 ** Some systems (e.g., SunOS) seem to have the call and the 2370 ** #define _PC_CHOWN_RESTRICTED, but don't actually implement 2371 ** the call. This heuristic checks for that. 2372 */ 2373 2374 errno = 0; 2375 rval = fpathconf(fd, _PC_CHOWN_RESTRICTED); 2376 if (errno == 0) 2377 return rval > 0; 2378 # endif 2379 # ifdef BSD 2380 return TRUE; 2381 # else 2382 return FALSE; 2383 # endif 2384 # endif 2385 #endif 2386 } 2387 /* 2388 ** RESETLIMITS -- reset system controlled resource limits 2389 ** 2390 ** This is to avoid denial-of-service attacks 2391 ** 2392 ** Parameters: 2393 ** none 2394 ** 2395 ** Returns: 2396 ** none 2397 */ 2398 2399 #if HASSETRLIMIT 2400 # include <sys/resource.h> 2401 #endif 2402 2403 resetlimits() 2404 { 2405 #if HASSETRLIMIT 2406 struct rlimit lim; 2407 2408 lim.rlim_cur = lim.rlim_max = RLIM_INFINITY; 2409 (void) setrlimit(RLIMIT_CPU, &lim); 2410 (void) setrlimit(RLIMIT_FSIZE, &lim); 2411 #else 2412 # if HASULIMIT 2413 (void) ulimit(2, 0x3fffff); 2414 # endif 2415 #endif 2416 } 2417 /* 2418 ** GETCFNAME -- return the name of the .cf file. 2419 ** 2420 ** Some systems (e.g., NeXT) determine this dynamically. 2421 */ 2422 2423 char * 2424 getcfname() 2425 { 2426 if (ConfFile != NULL) 2427 return ConfFile; 2428 #ifdef NETINFO 2429 { 2430 extern char *ni_propval(); 2431 char *cflocation; 2432 2433 cflocation = ni_propval("/locations", NULL, "sendmail", 2434 "sendmail.cf", '\0'); 2435 if (cflocation != NULL) 2436 return cflocation; 2437 } 2438 #endif 2439 return _PATH_SENDMAILCF; 2440 } 2441 /* 2442 ** SETVENDOR -- process vendor code from V configuration line 2443 ** 2444 ** Parameters: 2445 ** vendor -- string representation of vendor. 2446 ** 2447 ** Returns: 2448 ** TRUE -- if ok. 2449 ** FALSE -- if vendor code could not be processed. 2450 ** 2451 ** Side Effects: 2452 ** It is reasonable to set mode flags here to tweak 2453 ** processing in other parts of the code if necessary. 2454 ** For example, if you are a vendor that uses $%y to 2455 ** indicate YP lookups, you could enable that here. 2456 */ 2457 2458 bool 2459 setvendor(vendor) 2460 char *vendor; 2461 { 2462 if (strcasecmp(vendor, "Berkeley") == 0) 2463 { 2464 VendorCode = VENDOR_BERKELEY; 2465 return TRUE; 2466 } 2467 2468 /* add vendor extensions here */ 2469 2470 #ifdef SUN_EXTENSIONS 2471 if (strcasecmp(vendor, "Sun") == 0) 2472 { 2473 VendorCode = VENDOR_SUN; 2474 return TRUE; 2475 } 2476 #endif 2477 2478 return FALSE; 2479 } 2480 /* 2481 ** STRTOL -- convert string to long integer 2482 ** 2483 ** For systems that don't have it in the C library. 2484 ** 2485 ** This is taken verbatim from the 4.4-Lite C library. 2486 */ 2487 2488 #ifdef NEEDSTRTOL 2489 2490 #if defined(LIBC_SCCS) && !defined(lint) 2491 static char sccsid[] = "@(#)strtol.c 8.1 (Berkeley) 6/4/93"; 2492 #endif /* LIBC_SCCS and not lint */ 2493 2494 #include <limits.h> 2495 2496 /* 2497 * Convert a string to a long integer. 2498 * 2499 * Ignores `locale' stuff. Assumes that the upper and lower case 2500 * alphabets and digits are each contiguous. 2501 */ 2502 2503 long 2504 strtol(nptr, endptr, base) 2505 const char *nptr; 2506 char **endptr; 2507 register int base; 2508 { 2509 register const char *s = nptr; 2510 register unsigned long acc; 2511 register int c; 2512 register unsigned long cutoff; 2513 register int neg = 0, any, cutlim; 2514 2515 /* 2516 * Skip white space and pick up leading +/- sign if any. 2517 * If base is 0, allow 0x for hex and 0 for octal, else 2518 * assume decimal; if base is already 16, allow 0x. 2519 */ 2520 do { 2521 c = *s++; 2522 } while (isspace(c)); 2523 if (c == '-') { 2524 neg = 1; 2525 c = *s++; 2526 } else if (c == '+') 2527 c = *s++; 2528 if ((base == 0 || base == 16) && 2529 c == '0' && (*s == 'x' || *s == 'X')) { 2530 c = s[1]; 2531 s += 2; 2532 base = 16; 2533 } 2534 if (base == 0) 2535 base = c == '0' ? 8 : 10; 2536 2537 /* 2538 * Compute the cutoff value between legal numbers and illegal 2539 * numbers. That is the largest legal value, divided by the 2540 * base. An input number that is greater than this value, if 2541 * followed by a legal input character, is too big. One that 2542 * is equal to this value may be valid or not; the limit 2543 * between valid and invalid numbers is then based on the last 2544 * digit. For instance, if the range for longs is 2545 * [-2147483648..2147483647] and the input base is 10, 2546 * cutoff will be set to 214748364 and cutlim to either 2547 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated 2548 * a value > 214748364, or equal but the next digit is > 7 (or 8), 2549 * the number is too big, and we will return a range error. 2550 * 2551 * Set any if any `digits' consumed; make it negative to indicate 2552 * overflow. 2553 */ 2554 cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX; 2555 cutlim = cutoff % (unsigned long)base; 2556 cutoff /= (unsigned long)base; 2557 for (acc = 0, any = 0;; c = *s++) { 2558 if (isdigit(c)) 2559 c -= '0'; 2560 else if (isalpha(c)) 2561 c -= isupper(c) ? 'A' - 10 : 'a' - 10; 2562 else 2563 break; 2564 if (c >= base) 2565 break; 2566 if (any < 0 || acc > cutoff || acc == cutoff && c > cutlim) 2567 any = -1; 2568 else { 2569 any = 1; 2570 acc *= base; 2571 acc += c; 2572 } 2573 } 2574 if (any < 0) { 2575 acc = neg ? LONG_MIN : LONG_MAX; 2576 errno = ERANGE; 2577 } else if (neg) 2578 acc = -acc; 2579 if (endptr != 0) 2580 *endptr = (char *)(any ? s - 1 : nptr); 2581 return (acc); 2582 } 2583 2584 #endif 2585 /* 2586 ** SOLARIS_GETHOSTBY{NAME,ADDR} -- compatibility routines for gethostbyXXX 2587 ** 2588 ** Solaris versions at least through 2.3 don't properly deliver a 2589 ** canonical h_name field. This tries to work around it. 2590 */ 2591 2592 #ifdef SOLARIS 2593 2594 extern int h_errno; 2595 2596 struct hostent * 2597 solaris_gethostbyname(name) 2598 const char *name; 2599 { 2600 # ifdef SOLARIS_2_3 2601 static struct hostent hp; 2602 static char buf[1000]; 2603 extern struct hostent *_switch_gethostbyname_r(); 2604 2605 return _switch_gethostbyname_r(name, &hp, buf, sizeof(buf), &h_errno); 2606 # else 2607 extern struct hostent *__switch_gethostbyname(); 2608 2609 return __switch_gethostbyname(name); 2610 # endif 2611 } 2612 2613 struct hostent * 2614 solaris_gethostbyaddr(addr, len, type) 2615 const char *addr; 2616 int len; 2617 int type; 2618 { 2619 # ifdef SOLARIS_2_3 2620 static struct hostent hp; 2621 static char buf[1000]; 2622 extern struct hostent *_switch_gethostbyaddr_r(); 2623 2624 return _switch_gethostbyaddr_r(addr, len, type, &hp, buf, sizeof(buf), &h_errno); 2625 # else 2626 extern struct hostent *__switch_gethostbyaddr(); 2627 2628 return __switch_gethostbyaddr(addr, len, type); 2629 # endif 2630 } 2631 2632 #endif 2633 /* 2634 ** NI_PROPVAL -- netinfo property value lookup routine 2635 ** 2636 ** Parameters: 2637 ** keydir -- the Netinfo directory name in which to search 2638 ** for the key. 2639 ** keyprop -- the name of the property in which to find the 2640 ** property we are interested. Defaults to "name". 2641 ** keyval -- the value for which we are really searching. 2642 ** valprop -- the property name for the value in which we 2643 ** are interested. 2644 ** sepchar -- if non-nil, this can be multiple-valued, and 2645 ** we should return a string separated by this 2646 ** character. 2647 ** 2648 ** Returns: 2649 ** NULL -- if: 2650 ** 1. the directory is not found 2651 ** 2. the property name is not found 2652 ** 3. the property contains multiple values 2653 ** 4. some error occured 2654 ** else -- the location of the config file. 2655 ** 2656 ** Example: 2657 ** To search for an alias value, use: 2658 ** ni_propval("/aliases", "name", aliasname, "members", ',') 2659 ** 2660 ** Notes: 2661 ** Caller should free the return value of ni_proval 2662 */ 2663 2664 #ifdef NETINFO 2665 2666 # include <netinfo/ni.h> 2667 2668 # define LOCAL_NETINFO_DOMAIN "." 2669 # define PARENT_NETINFO_DOMAIN ".." 2670 # define MAX_NI_LEVELS 256 2671 2672 char * 2673 ni_propval(keydir, keyprop, keyval, valprop, sepchar) 2674 char *keydir; 2675 char *keyprop; 2676 char *keyval; 2677 char *valprop; 2678 char sepchar; 2679 { 2680 char *propval = NULL; 2681 int i; 2682 int j, alen; 2683 void *ni = NULL; 2684 void *lastni = NULL; 2685 ni_status nis; 2686 ni_id nid; 2687 ni_namelist ninl; 2688 register char *p; 2689 char keybuf[1024]; 2690 2691 /* 2692 ** Create the full key from the two parts. 2693 ** 2694 ** Note that directory can end with, e.g., "name=" to specify 2695 ** an alternate search property. 2696 */ 2697 2698 i = strlen(keydir) + strlen(keyval) + 2; 2699 if (keyprop != NULL) 2700 i += strlen(keyprop) + 1; 2701 if (i > sizeof keybuf) 2702 return NULL; 2703 strcpy(keybuf, keydir); 2704 strcat(keybuf, "/"); 2705 if (keyprop != NULL) 2706 { 2707 strcat(keybuf, keyprop); 2708 strcat(keybuf, "="); 2709 } 2710 strcat(keybuf, keyval); 2711 2712 /* 2713 ** If the passed directory and property name are found 2714 ** in one of netinfo domains we need to search (starting 2715 ** from the local domain moving all the way back to the 2716 ** root domain) set propval to the property's value 2717 ** and return it. 2718 */ 2719 2720 for (i = 0; i < MAX_NI_LEVELS; ++i) 2721 { 2722 if (i == 0) 2723 { 2724 nis = ni_open(NULL, LOCAL_NETINFO_DOMAIN, &ni); 2725 } 2726 else 2727 { 2728 if (lastni != NULL) 2729 ni_free(lastni); 2730 lastni = ni; 2731 nis = ni_open(lastni, PARENT_NETINFO_DOMAIN, &ni); 2732 } 2733 2734 /* 2735 ** Don't bother if we didn't get a handle on a 2736 ** proper domain. This is not necessarily an error. 2737 ** We would get a positive ni_status if, for instance 2738 ** we never found the directory or property and tried 2739 ** to open the parent of the root domain! 2740 */ 2741 2742 if (nis != 0) 2743 break; 2744 2745 /* 2746 ** Find the path to the server information. 2747 */ 2748 2749 if (ni_pathsearch(ni, &nid, keybuf) != 0) 2750 continue; 2751 2752 /* 2753 ** Find associated value information. 2754 */ 2755 2756 if (ni_lookupprop(ni, &nid, valprop, &ninl) != 0) 2757 continue; 2758 2759 /* 2760 ** See if we have an acceptable number of values. 2761 */ 2762 2763 if (ninl.ni_namelist_len <= 0) 2764 continue; 2765 2766 if (sepchar == '\0' && ninl.ni_namelist_len > 1) 2767 { 2768 ni_namelist_free(&ninl); 2769 continue; 2770 } 2771 2772 /* 2773 ** Calculate number of bytes needed and build result 2774 */ 2775 2776 alen = 1; 2777 for (j = 0; j < ninl.ni_namelist_len; j++) 2778 alen += strlen(ninl.ni_namelist_val[j]) + 1; 2779 propval = p = xalloc(alen); 2780 for (j = 0; j < ninl.ni_namelist_len; j++) 2781 { 2782 strcpy(p, ninl.ni_namelist_val[j]); 2783 p += strlen(p); 2784 *p++ = sepchar; 2785 } 2786 *--p = '\0'; 2787 2788 ni_namelist_free(&ninl); 2789 } 2790 2791 /* 2792 ** Clean up. 2793 */ 2794 2795 if (ni != NULL) 2796 ni_free(ni); 2797 if (lastni != NULL && ni != lastni) 2798 ni_free(lastni); 2799 2800 return propval; 2801 } 2802 2803 #endif /* NETINFO */ 2804 /* 2805 ** HARD_SYSLOG -- call syslog repeatedly until it works 2806 ** 2807 ** Needed on HP-UX, which apparently doesn't guarantee that 2808 ** syslog succeeds during interrupt handlers. 2809 */ 2810 2811 #ifdef __hpux 2812 2813 # define MAXSYSLOGTRIES 100 2814 # undef syslog 2815 2816 # ifdef __STDC__ 2817 hard_syslog(int pri, char *msg, ...) 2818 # else 2819 hard_syslog(pri, msg, va_alist) 2820 int pri; 2821 char *msg; 2822 va_dcl 2823 # endif 2824 { 2825 int i; 2826 char buf[SYSLOG_BUFSIZE * 2]; 2827 VA_LOCAL_DECL; 2828 2829 VA_START(msg); 2830 vsprintf(buf, msg, ap); 2831 VA_END; 2832 2833 for (i = MAXSYSLOGTRIES; --i >= 0 && syslog(pri, "%s", buf) < 0; ) 2834 continue; 2835 } 2836 2837 #endif 2838