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 8.5 (Berkeley) 07/19/93"; 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 <signal.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 96 NULL, 0, 97 }; 98 99 100 101 /* 102 ** Location of system files/databases/etc. 103 */ 104 105 char *ConfFile = _PATH_SENDMAILCF; /* runtime configuration */ 106 char *FreezeFile = _PATH_SENDMAILFC; /* frozen version of above */ 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_RESTRMAILQ, 124 "authwarnings", PRIV_AUTHWARNINGS, 125 "goaway", PRIV_GOAWAY, 126 NULL, 0, 127 }; 128 129 130 131 /* 132 ** Miscellaneous stuff. 133 */ 134 135 int DtableSize = 50; /* max open files; reset in 4.2bsd */ 136 /* 137 ** SETDEFAULTS -- set default values 138 ** 139 ** Because of the way freezing is done, these must be initialized 140 ** using direct code. 141 ** 142 ** Parameters: 143 ** e -- the default envelope. 144 ** 145 ** Returns: 146 ** none. 147 ** 148 ** Side Effects: 149 ** Initializes a bunch of global variables to their 150 ** default values. 151 */ 152 153 #define DAYS * 24 * 60 * 60 154 155 setdefaults(e) 156 register ENVELOPE *e; 157 { 158 SpaceSub = ' '; /* option B */ 159 QueueLA = 8; /* option x */ 160 RefuseLA = 12; /* option X */ 161 WkRecipFact = 30000L; /* option y */ 162 WkClassFact = 1800L; /* option z */ 163 WkTimeFact = 90000L; /* option Z */ 164 QueueFactor = WkRecipFact * 20; /* option q */ 165 FileMode = (RealUid != geteuid()) ? 0644 : 0600; 166 /* option F */ 167 DefUid = 1; /* option u */ 168 DefGid = 1; /* option g */ 169 CheckpointInterval = 10; /* option C */ 170 MaxHopCount = 25; /* option h */ 171 e->e_sendmode = SM_FORK; /* option d */ 172 e->e_errormode = EM_PRINT; /* option e */ 173 SevenBit = FALSE; /* option 7 */ 174 MaxMciCache = 1; /* option k */ 175 MciCacheTimeout = 300; /* option K */ 176 LogLevel = 9; /* option L */ 177 settimeouts(NULL); /* option r */ 178 TimeOuts.to_q_return = 5 DAYS; /* option T */ 179 TimeOuts.to_q_warning = 0; /* option T */ 180 PrivacyFlags = 0; /* option p */ 181 setdefuser(); 182 setupmaps(); 183 setupmailers(); 184 } 185 186 187 /* 188 ** SETDEFUSER -- set/reset DefUser using DefUid (for initgroups()) 189 */ 190 191 setdefuser() 192 { 193 struct passwd *defpwent; 194 static char defuserbuf[40]; 195 196 DefUser = defuserbuf; 197 if ((defpwent = getpwuid(DefUid)) != NULL) 198 strcpy(defuserbuf, defpwent->pw_name); 199 else 200 strcpy(defuserbuf, "nobody"); 201 } 202 /* 203 ** HOST_MAP_INIT -- initialize host class structures 204 */ 205 206 bool 207 host_map_init(map, args) 208 MAP *map; 209 char *args; 210 { 211 register char *p = args; 212 213 for (;;) 214 { 215 while (isascii(*p) && isspace(*p)) 216 p++; 217 if (*p != '-') 218 break; 219 switch (*++p) 220 { 221 case 'a': 222 map->map_app = ++p; 223 break; 224 } 225 while (*p != '\0' && !(isascii(*p) && isspace(*p))) 226 p++; 227 if (*p != '\0') 228 *p++ = '\0'; 229 } 230 if (map->map_app != NULL) 231 map->map_app = newstr(map->map_app); 232 return TRUE; 233 } 234 /* 235 ** SETUPMAILERS -- initialize default mailers 236 */ 237 238 setupmailers() 239 { 240 char buf[100]; 241 242 strcpy(buf, "prog, P=/bin/sh, F=lsD, A=sh -c $u"); 243 makemailer(buf); 244 245 strcpy(buf, "*file*, P=/dev/null, F=lsDFMPEu, A=FILE"); 246 makemailer(buf); 247 248 strcpy(buf, "*include*, P=/dev/null, F=su, A=INCLUDE"); 249 makemailer(buf); 250 } 251 /* 252 ** SETUPMAPS -- set up map classes 253 */ 254 255 #define MAPDEF(name, ext, flags, parse, open, close, lookup, store) \ 256 { \ 257 extern bool parse __P((MAP *, char *)); \ 258 extern bool open __P((MAP *, int)); \ 259 extern void close __P((MAP *)); \ 260 extern char *lookup __P((MAP *, char *, char **, int *)); \ 261 extern void store __P((MAP *, char *, char *)); \ 262 s = stab(name, ST_MAPCLASS, ST_ENTER); \ 263 s->s_mapclass.map_cname = name; \ 264 s->s_mapclass.map_ext = ext; \ 265 s->s_mapclass.map_cflags = flags; \ 266 s->s_mapclass.map_parse = parse; \ 267 s->s_mapclass.map_open = open; \ 268 s->s_mapclass.map_close = close; \ 269 s->s_mapclass.map_lookup = lookup; \ 270 s->s_mapclass.map_store = store; \ 271 } 272 273 setupmaps() 274 { 275 register STAB *s; 276 277 #ifdef NEWDB 278 MAPDEF("hash", ".db", MCF_ALIASOK|MCF_REBUILDABLE, 279 map_parseargs, hash_map_open, db_map_close, 280 db_map_lookup, db_map_store); 281 MAPDEF("btree", ".db", MCF_ALIASOK|MCF_REBUILDABLE, 282 map_parseargs, bt_map_open, db_map_close, 283 db_map_lookup, db_map_store); 284 #endif 285 286 #ifdef NDBM 287 MAPDEF("dbm", ".dir", MCF_ALIASOK|MCF_REBUILDABLE, 288 map_parseargs, ndbm_map_open, ndbm_map_close, 289 ndbm_map_lookup, ndbm_map_store); 290 #endif 291 292 #ifdef NIS 293 MAPDEF("nis", NULL, MCF_ALIASOK, 294 map_parseargs, nis_map_open, nis_map_close, 295 nis_map_lookup, nis_map_store); 296 #endif 297 298 MAPDEF("stab", NULL, MCF_ALIASOK|MCF_ALIASONLY, 299 map_parseargs, stab_map_open, stab_map_close, 300 stab_map_lookup, stab_map_store); 301 302 MAPDEF("implicit", NULL, MCF_ALIASOK|MCF_ALIASONLY|MCF_REBUILDABLE, 303 map_parseargs, impl_map_open, impl_map_close, 304 impl_map_lookup, impl_map_store); 305 306 /* host DNS lookup */ 307 MAPDEF("host", NULL, 0, 308 host_map_init, null_map_open, null_map_close, 309 host_map_lookup, null_map_store); 310 311 /* dequote map */ 312 MAPDEF("dequote", NULL, 0, 313 dequote_init, null_map_open, null_map_close, 314 dequote_map, null_map_store); 315 316 #if 0 317 # ifdef USERDB 318 /* user database */ 319 MAPDEF("udb", ".db", 0, 320 udb_map_parse, null_map_open, null_map_close, 321 udb_map_lookup, null_map_store); 322 # endif 323 #endif 324 } 325 326 #undef MAPDEF 327 /* 328 ** USERNAME -- return the user id of the logged in user. 329 ** 330 ** Parameters: 331 ** none. 332 ** 333 ** Returns: 334 ** The login name of the logged in user. 335 ** 336 ** Side Effects: 337 ** none. 338 ** 339 ** Notes: 340 ** The return value is statically allocated. 341 */ 342 343 char * 344 username() 345 { 346 static char *myname = NULL; 347 extern char *getlogin(); 348 register struct passwd *pw; 349 350 /* cache the result */ 351 if (myname == NULL) 352 { 353 myname = getlogin(); 354 if (myname == NULL || myname[0] == '\0') 355 { 356 pw = getpwuid(RealUid); 357 if (pw != NULL) 358 myname = newstr(pw->pw_name); 359 } 360 else 361 { 362 uid_t uid = RealUid; 363 364 myname = newstr(myname); 365 if ((pw = getpwnam(myname)) == NULL || 366 (uid != 0 && uid != pw->pw_uid)) 367 { 368 pw = getpwuid(uid); 369 if (pw != NULL) 370 myname = newstr(pw->pw_name); 371 } 372 } 373 if (myname == NULL || myname[0] == '\0') 374 { 375 syserr("554 Who are you?"); 376 myname = "postmaster"; 377 } 378 } 379 380 return (myname); 381 } 382 /* 383 ** TTYPATH -- Get the path of the user's tty 384 ** 385 ** Returns the pathname of the user's tty. Returns NULL if 386 ** the user is not logged in or if s/he has write permission 387 ** denied. 388 ** 389 ** Parameters: 390 ** none 391 ** 392 ** Returns: 393 ** pathname of the user's tty. 394 ** NULL if not logged in or write permission denied. 395 ** 396 ** Side Effects: 397 ** none. 398 ** 399 ** WARNING: 400 ** Return value is in a local buffer. 401 ** 402 ** Called By: 403 ** savemail 404 */ 405 406 char * 407 ttypath() 408 { 409 struct stat stbuf; 410 register char *pathn; 411 extern char *ttyname(); 412 extern char *getlogin(); 413 414 /* compute the pathname of the controlling tty */ 415 if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL && 416 (pathn = ttyname(0)) == NULL) 417 { 418 errno = 0; 419 return (NULL); 420 } 421 422 /* see if we have write permission */ 423 if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode)) 424 { 425 errno = 0; 426 return (NULL); 427 } 428 429 /* see if the user is logged in */ 430 if (getlogin() == NULL) 431 return (NULL); 432 433 /* looks good */ 434 return (pathn); 435 } 436 /* 437 ** CHECKCOMPAT -- check for From and To person compatible. 438 ** 439 ** This routine can be supplied on a per-installation basis 440 ** to determine whether a person is allowed to send a message. 441 ** This allows restriction of certain types of internet 442 ** forwarding or registration of users. 443 ** 444 ** If the hosts are found to be incompatible, an error 445 ** message should be given using "usrerr" and 0 should 446 ** be returned. 447 ** 448 ** 'NoReturn' can be set to suppress the return-to-sender 449 ** function; this should be done on huge messages. 450 ** 451 ** Parameters: 452 ** to -- the person being sent to. 453 ** 454 ** Returns: 455 ** an exit status 456 ** 457 ** Side Effects: 458 ** none (unless you include the usrerr stuff) 459 */ 460 461 checkcompat(to, e) 462 register ADDRESS *to; 463 register ENVELOPE *e; 464 { 465 # ifdef lint 466 if (to == NULL) 467 to++; 468 # endif /* lint */ 469 # ifdef EXAMPLE_CODE 470 /* this code is intended as an example only */ 471 register STAB *s; 472 473 s = stab("arpa", ST_MAILER, ST_FIND); 474 if (s != NULL && e->e_from.q_mailer != LocalMailer && 475 to->q_mailer == s->s_mailer) 476 { 477 usrerr("553 No ARPA mail through this machine: see your system administration"); 478 /* NoReturn = TRUE; to supress return copy */ 479 return (EX_UNAVAILABLE); 480 } 481 # endif /* EXAMPLE_CODE */ 482 return (EX_OK); 483 } 484 /* 485 ** HOLDSIGS -- arrange to hold all signals 486 ** 487 ** Parameters: 488 ** none. 489 ** 490 ** Returns: 491 ** none. 492 ** 493 ** Side Effects: 494 ** Arranges that signals are held. 495 */ 496 497 holdsigs() 498 { 499 } 500 /* 501 ** RLSESIGS -- arrange to release all signals 502 ** 503 ** This undoes the effect of holdsigs. 504 ** 505 ** Parameters: 506 ** none. 507 ** 508 ** Returns: 509 ** none. 510 ** 511 ** Side Effects: 512 ** Arranges that signals are released. 513 */ 514 515 rlsesigs() 516 { 517 } 518 /* 519 ** GETLA -- get the current load average 520 ** 521 ** This code stolen from la.c. 522 ** 523 ** Parameters: 524 ** none. 525 ** 526 ** Returns: 527 ** The current load average as an integer. 528 ** 529 ** Side Effects: 530 ** none. 531 */ 532 533 /* try to guess what style of load average we have */ 534 #define LA_ZERO 1 /* always return load average as zero */ 535 #define LA_INT 2 /* read kmem for avenrun; interpret as int */ 536 #define LA_FLOAT 3 /* read kmem for avenrun; interpret as float */ 537 #define LA_SUBR 4 /* call getloadavg */ 538 539 #ifndef LA_TYPE 540 # if defined(sun) && !defined(BSD) 541 # define LA_TYPE LA_INT 542 # endif 543 # if defined(mips) || defined(__alpha) 544 /* Ultrix or OSF/1 or RISC/os */ 545 # define LA_TYPE LA_INT 546 # define LA_AVENRUN "avenrun" 547 # endif 548 # if defined(__hpux) 549 # define LA_TYPE LA_FLOAT 550 # define LA_AVENRUN "avenrun" 551 # endif 552 # if defined(__NeXT__) 553 # define LA_TYPE LA_ZERO 554 # endif 555 556 /* now do the guesses based on general OS type */ 557 # ifndef LA_TYPE 558 # if defined(SYSTEM5) 559 # define LA_TYPE LA_INT 560 # define LA_AVENRUN "avenrun" 561 # else 562 # if defined(BSD) 563 # define LA_TYPE LA_SUBR 564 # else 565 # define LA_TYPE LA_ZERO 566 # endif 567 # endif 568 # endif 569 #endif 570 571 #if (LA_TYPE == LA_INT) || (LA_TYPE == LA_FLOAT) 572 573 #include <nlist.h> 574 575 #ifndef LA_AVENRUN 576 #define LA_AVENRUN "_avenrun" 577 #endif 578 579 /* _PATH_UNIX should be defined in <paths.h> */ 580 #ifndef _PATH_UNIX 581 # if defined(__hpux) 582 # define _PATH_UNIX "/hp-ux" 583 # endif 584 # if defined(mips) && !defined(ultrix) 585 /* powerful RISC/os */ 586 # define _PATH_UNIX "/unix" 587 # endif 588 # if defined(Solaris2) 589 /* Solaris 2 */ 590 # define _PATH_UNIX "/kernel/unix" 591 # endif 592 # if defined(SYSTEM5) 593 # ifndef _PATH_UNIX 594 # define _PATH_UNIX "/unix" 595 # endif 596 # endif 597 # ifndef _PATH_UNIX 598 # define _PATH_UNIX "/vmunix" 599 # endif 600 #endif 601 602 struct nlist Nl[] = 603 { 604 { LA_AVENRUN }, 605 #define X_AVENRUN 0 606 { 0 }, 607 }; 608 609 #ifndef FSHIFT 610 # if defined(unixpc) 611 # define FSHIFT 5 612 # endif 613 614 # if defined(__alpha) 615 # define FSHIFT 10 616 # endif 617 618 # if (LA_TYPE == LA_INT) 619 # define FSHIFT 8 620 # endif 621 #endif 622 623 #if (LA_TYPE == LA_INT) && !defined(FSCALE) 624 # define FSCALE (1 << FSHIFT) 625 #endif 626 627 getla() 628 { 629 static int kmem = -1; 630 #if LA_TYPE == LA_INT 631 long avenrun[3]; 632 #else 633 double avenrun[3]; 634 #endif 635 extern off_t lseek(); 636 extern int errno; 637 638 if (kmem < 0) 639 { 640 kmem = open("/dev/kmem", 0, 0); 641 if (kmem < 0) 642 { 643 if (tTd(3, 1)) 644 printf("getla: open(/dev/kmem): %s\n", 645 errstring(errno)); 646 return (-1); 647 } 648 (void) fcntl(kmem, F_SETFD, 1); 649 if (nlist(_PATH_UNIX, Nl) < 0) 650 { 651 if (tTd(3, 1)) 652 printf("getla: nlist(%s): %s\n", _PATH_UNIX, 653 errstring(errno)); 654 return (-1); 655 } 656 if (Nl[X_AVENRUN].n_value == 0) 657 { 658 if (tTd(3, 1)) 659 printf("getla: nlist(%s, %s) ==> 0\n", 660 _PATH_UNIX, LA_AVENRUN); 661 return (-1); 662 } 663 } 664 if (tTd(3, 20)) 665 printf("getla: symbol address = %#x\n", Nl[X_AVENRUN].n_value); 666 if (lseek(kmem, (off_t) Nl[X_AVENRUN].n_value, 0) == -1 || 667 read(kmem, (char *) avenrun, sizeof(avenrun)) < sizeof(avenrun)) 668 { 669 /* thank you Ian */ 670 if (tTd(3, 1)) 671 printf("getla: lseek or read: %s\n", errstring(errno)); 672 return (-1); 673 } 674 #if LA_TYPE == LA_INT 675 if (tTd(3, 5)) 676 { 677 printf("getla: avenrun = %d", avenrun[0]); 678 if (tTd(3, 15)) 679 printf(", %d, %d", avenrun[1], avenrun[2]); 680 printf("\n"); 681 } 682 if (tTd(3, 1)) 683 printf("getla: %d\n", (int) (avenrun[0] + FSCALE/2) >> FSHIFT); 684 return ((int) (avenrun[0] + FSCALE/2) >> FSHIFT); 685 #else 686 if (tTd(3, 5)) 687 { 688 printf("getla: avenrun = %g", avenrun[0]); 689 if (tTd(3, 15)) 690 printf(", %g, %g", avenrun[1], avenrun[2]); 691 printf("\n"); 692 } 693 if (tTd(3, 1)) 694 printf("getla: %d\n", (int) (avenrun[0] +0.5)); 695 return ((int) (avenrun[0] + 0.5)); 696 #endif 697 } 698 699 #else 700 #if LA_TYPE == LA_SUBR 701 702 getla() 703 { 704 double avenrun[3]; 705 706 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) < 0) 707 { 708 if (tTd(3, 1)) 709 perror("getla: getloadavg failed:"); 710 return (-1); 711 } 712 if (tTd(3, 1)) 713 printf("getla: %d\n", (int) (avenrun[0] +0.5)); 714 return ((int) (avenrun[0] + 0.5)); 715 } 716 717 #else 718 719 getla() 720 { 721 if (tTd(3, 1)) 722 printf("getla: ZERO\n"); 723 return (0); 724 } 725 726 #endif 727 #endif 728 /* 729 ** SHOULDQUEUE -- should this message be queued or sent? 730 ** 731 ** Compares the message cost to the load average to decide. 732 ** 733 ** Parameters: 734 ** pri -- the priority of the message in question. 735 ** ctime -- the message creation time. 736 ** 737 ** Returns: 738 ** TRUE -- if this message should be queued up for the 739 ** time being. 740 ** FALSE -- if the load is low enough to send this message. 741 ** 742 ** Side Effects: 743 ** none. 744 */ 745 746 bool 747 shouldqueue(pri, ctime) 748 long pri; 749 time_t ctime; 750 { 751 if (CurrentLA < QueueLA) 752 return (FALSE); 753 if (CurrentLA >= RefuseLA) 754 return (TRUE); 755 return (pri > (QueueFactor / (CurrentLA - QueueLA + 1))); 756 } 757 /* 758 ** REFUSECONNECTIONS -- decide if connections should be refused 759 ** 760 ** Parameters: 761 ** none. 762 ** 763 ** Returns: 764 ** TRUE if incoming SMTP connections should be refused 765 ** (for now). 766 ** FALSE if we should accept new work. 767 ** 768 ** Side Effects: 769 ** none. 770 */ 771 772 bool 773 refuseconnections() 774 { 775 #ifdef XLA 776 if (!xla_smtp_ok()) 777 return TRUE; 778 #endif 779 780 /* this is probably too simplistic */ 781 return (CurrentLA >= RefuseLA); 782 } 783 /* 784 ** SETPROCTITLE -- set process title for ps 785 ** 786 ** Parameters: 787 ** fmt -- a printf style format string. 788 ** a, b, c -- possible parameters to fmt. 789 ** 790 ** Returns: 791 ** none. 792 ** 793 ** Side Effects: 794 ** Clobbers argv of our main procedure so ps(1) will 795 ** display the title. 796 */ 797 798 #ifdef SETPROCTITLE 799 # ifdef __hpux 800 # include <sys/pstat.h> 801 # endif 802 # ifdef BSD4_4 803 # include <machine/vmparam.h> 804 # include <sys/exec.h> 805 # ifdef PS_STRINGS 806 # define SETPROC_STATIC static 807 # endif 808 # endif 809 # ifndef SETPROC_STATIC 810 # define SETPROC_STATIC 811 # endif 812 #endif 813 814 /*VARARGS1*/ 815 #ifdef __STDC__ 816 setproctitle(char *fmt, ...) 817 #else 818 setproctitle(fmt, va_alist) 819 char *fmt; 820 va_dcl 821 #endif 822 { 823 # ifdef SETPROCTITLE 824 register char *p; 825 register int i; 826 SETPROC_STATIC char buf[MAXLINE]; 827 VA_LOCAL_DECL 828 # ifdef __hpux 829 union pstun pst; 830 # endif 831 extern char **Argv; 832 extern char *LastArgv; 833 834 p = buf; 835 836 /* print sendmail: heading for grep */ 837 (void) strcpy(p, "sendmail: "); 838 p += strlen(p); 839 840 /* print the argument string */ 841 VA_START(fmt); 842 (void) vsprintf(p, fmt, ap); 843 VA_END; 844 845 i = strlen(buf); 846 847 # ifdef __hpux 848 pst.pst_command = buf; 849 pstat(PSTAT_SETCMD, pst, i, 0, 0); 850 # else 851 # ifdef PS_STRINGS 852 PS_STRINGS->ps_nargvstr = 1; 853 PS_STRINGS->ps_argvstr = buf; 854 # else 855 if (i > LastArgv - Argv[0] - 2) 856 { 857 i = LastArgv - Argv[0] - 2; 858 buf[i] = '\0'; 859 } 860 (void) strcpy(Argv[0], buf); 861 p = &Argv[0][i]; 862 while (p < LastArgv) 863 *p++ = ' '; 864 # endif 865 # endif 866 # endif /* SETPROCTITLE */ 867 } 868 /* 869 ** REAPCHILD -- pick up the body of my child, lest it become a zombie 870 ** 871 ** Parameters: 872 ** none. 873 ** 874 ** Returns: 875 ** none. 876 ** 877 ** Side Effects: 878 ** Picks up extant zombies. 879 */ 880 881 # include <sys/wait.h> 882 883 void 884 reapchild() 885 { 886 # if defined(WIFEXITED) && !defined(__NeXT__) 887 auto int status; 888 int count; 889 int pid; 890 891 count = 0; 892 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) 893 { 894 if (count++ > 1000) 895 { 896 syslog(LOG_ALERT, "reapchild: waitpid loop: pid=%d, status=%x", 897 pid, status); 898 break; 899 } 900 } 901 # else 902 # ifdef WNOHANG 903 union wait status; 904 905 while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0) 906 continue; 907 # else /* WNOHANG */ 908 auto int status; 909 910 while (wait(&status) > 0) 911 continue; 912 # endif /* WNOHANG */ 913 # endif 914 # ifdef SYSTEM5 915 (void) signal(SIGCHLD, reapchild); 916 # endif 917 } 918 /* 919 ** UNSETENV -- remove a variable from the environment 920 ** 921 ** Not needed on newer systems. 922 ** 923 ** Parameters: 924 ** name -- the string name of the environment variable to be 925 ** deleted from the current environment. 926 ** 927 ** Returns: 928 ** none. 929 ** 930 ** Globals: 931 ** environ -- a pointer to the current environment. 932 ** 933 ** Side Effects: 934 ** Modifies environ. 935 */ 936 937 #ifdef UNSETENV 938 939 void 940 unsetenv(name) 941 char *name; 942 { 943 extern char **environ; 944 register char **pp; 945 int len = strlen(name); 946 947 for (pp = environ; *pp != NULL; pp++) 948 { 949 if (strncmp(name, *pp, len) == 0 && 950 ((*pp)[len] == '=' || (*pp)[len] == '\0')) 951 break; 952 } 953 954 for (; *pp != NULL; pp++) 955 *pp = pp[1]; 956 } 957 958 #endif /* UNSETENV */ 959 /* 960 ** GETDTABLESIZE -- return number of file descriptors 961 ** 962 ** Only on non-BSD systems 963 ** 964 ** Parameters: 965 ** none 966 ** 967 ** Returns: 968 ** size of file descriptor table 969 ** 970 ** Side Effects: 971 ** none 972 */ 973 974 #ifdef SOLARIS 975 # include <sys/resource.h> 976 #endif 977 978 int 979 getdtsize() 980 { 981 #ifdef RLIMIT_NOFILE 982 struct rlimit rl; 983 984 if (getrlimit(RLIMIT_NOFILE, &rl) >= 0) 985 return rl.rlim_cur; 986 #endif 987 988 # ifdef _SC_OPEN_MAX 989 return sysconf(_SC_OPEN_MAX); 990 # else 991 # ifdef HASGETDTABLESIZE 992 return getdtablesize(); 993 # else 994 return NOFILE; 995 # endif 996 # endif 997 } 998 /* 999 ** UNAME -- get the UUCP name of this system. 1000 */ 1001 1002 #ifndef HASUNAME 1003 1004 int 1005 uname(name) 1006 struct utsname *name; 1007 { 1008 FILE *file; 1009 char *n; 1010 1011 name->nodename[0] = '\0'; 1012 1013 /* try /etc/whoami -- one line with the node name */ 1014 if ((file = fopen("/etc/whoami", "r")) != NULL) 1015 { 1016 (void) fgets(name->nodename, NODE_LENGTH + 1, file); 1017 (void) fclose(file); 1018 n = strchr(name->nodename, '\n'); 1019 if (n != NULL) 1020 *n = '\0'; 1021 if (name->nodename[0] != '\0') 1022 return (0); 1023 } 1024 1025 /* try /usr/include/whoami.h -- has a #define somewhere */ 1026 if ((file = fopen("/usr/include/whoami.h", "r")) != NULL) 1027 { 1028 char buf[MAXLINE]; 1029 1030 while (fgets(buf, MAXLINE, file) != NULL) 1031 if (sscanf(buf, "#define sysname \"%*[^\"]\"", 1032 NODE_LENGTH, name->nodename) > 0) 1033 break; 1034 (void) fclose(file); 1035 if (name->nodename[0] != '\0') 1036 return (0); 1037 } 1038 1039 #ifdef TRUST_POPEN 1040 /* 1041 ** Popen is known to have security holes. 1042 */ 1043 1044 /* try uuname -l to return local name */ 1045 if ((file = popen("uuname -l", "r")) != NULL) 1046 { 1047 (void) fgets(name, NODE_LENGTH + 1, file); 1048 (void) pclose(file); 1049 n = strchr(name, '\n'); 1050 if (n != NULL) 1051 *n = '\0'; 1052 if (name->nodename[0] != '\0') 1053 return (0); 1054 } 1055 #endif 1056 1057 return (-1); 1058 } 1059 #endif /* HASUNAME */ 1060 /* 1061 ** INITGROUPS -- initialize groups 1062 ** 1063 ** Stub implementation for System V style systems 1064 */ 1065 1066 #ifndef HASINITGROUPS 1067 # if !defined(SYSTEM5) || defined(__hpux) 1068 # define HASINITGROUPS 1069 # endif 1070 #endif 1071 1072 #ifndef HASINITGROUPS 1073 1074 initgroups(name, basegid) 1075 char *name; 1076 int basegid; 1077 { 1078 return 0; 1079 } 1080 1081 #endif 1082 /* 1083 ** SETSID -- set session id (for non-POSIX systems) 1084 */ 1085 1086 #ifndef HASSETSID 1087 1088 pid_t 1089 setsid __P ((void)) 1090 { 1091 # ifdef SYSTEM5 1092 return setpgrp(); 1093 # else 1094 return 0; 1095 # endif 1096 } 1097 1098 #endif 1099 /* 1100 ** ENOUGHSPACE -- check to see if there is enough free space on the queue fs 1101 ** 1102 ** Only implemented if you have statfs. 1103 ** 1104 ** Parameters: 1105 ** msize -- the size to check against. If zero, we don't yet 1106 ** know how big the message will be, so just check for 1107 ** a "reasonable" amount. 1108 ** 1109 ** Returns: 1110 ** TRUE if there is enough space. 1111 ** FALSE otherwise. 1112 */ 1113 1114 #ifndef HASSTATFS 1115 # if defined(BSD4_4) || defined(__osf__) 1116 # define HASSTATFS 1117 # endif 1118 #endif 1119 1120 #ifdef HASSTATFS 1121 # undef HASUSTAT 1122 #endif 1123 1124 #if defined(HASUSTAT) 1125 # include <ustat.h> 1126 #endif 1127 1128 #ifdef HASSTATFS 1129 # if defined(sgi) || defined(apollo) 1130 # include <sys/statfs.h> 1131 # else 1132 # if (defined(sun) && !defined(BSD)) || defined(__hpux) 1133 # include <sys/vfs.h> 1134 # else 1135 # include <sys/mount.h> 1136 # endif 1137 # endif 1138 #endif 1139 1140 bool 1141 enoughspace(msize) 1142 long msize; 1143 { 1144 #if defined(HASSTATFS) || defined(HASUSTAT) 1145 # if defined(HASUSTAT) 1146 struct ustat fs; 1147 struct stat statbuf; 1148 # define FSBLOCKSIZE DEV_BSIZE 1149 # define f_bavail f_tfree 1150 # else 1151 # if defined(ultrix) 1152 struct fs_data fs; 1153 # define f_bavail fd_bfreen 1154 # define FSBLOCKSIZE fs.fd_bsize 1155 # else 1156 struct statfs fs; 1157 # define FSBLOCKSIZE fs.f_bsize 1158 # endif 1159 # endif 1160 extern int errno; 1161 1162 if (MinBlocksFree <= 0 && msize <= 0) 1163 { 1164 if (tTd(4, 80)) 1165 printf("enoughspace: no threshold\n"); 1166 return TRUE; 1167 } 1168 1169 # if defined(HASUSTAT) 1170 if (stat(QueueDir, &statbuf) == 0 && ustat(statbuf.st_dev, &fs) == 0) 1171 # else 1172 # if defined(sgi) || defined(apollo) 1173 if (statfs(QueueDir, &fs, sizeof fs, 0) == 0) 1174 # else 1175 # if defined(ultrix) 1176 if (statfs(QueueDir, &fs) > 0) 1177 # else 1178 if (statfs(QueueDir, &fs) == 0) 1179 # endif 1180 # endif 1181 # endif 1182 { 1183 if (tTd(4, 80)) 1184 printf("enoughspace: bavail=%ld, need=%ld\n", 1185 fs.f_bavail, msize); 1186 1187 /* convert msize to block count */ 1188 msize = msize / FSBLOCKSIZE + 1; 1189 if (MinBlocksFree >= 0) 1190 msize += MinBlocksFree; 1191 1192 if (fs.f_bavail < msize) 1193 { 1194 #ifdef LOG 1195 if (LogLevel > 0) 1196 syslog(LOG_ALERT, "%s: low on space (have %ld, need %ld)", 1197 QueueDir, fs.f_bavail, msize); 1198 #endif 1199 return FALSE; 1200 } 1201 } 1202 else if (tTd(4, 80)) 1203 printf("enoughspace failure: min=%ld, need=%ld: %s\n", 1204 MinBlocksFree, msize, errstring(errno)); 1205 #endif 1206 return TRUE; 1207 } 1208 /* 1209 ** TRANSIENTERROR -- tell if an error code indicates a transient failure 1210 ** 1211 ** This looks at an errno value and tells if this is likely to 1212 ** go away if retried later. 1213 ** 1214 ** Parameters: 1215 ** err -- the errno code to classify. 1216 ** 1217 ** Returns: 1218 ** TRUE if this is probably transient. 1219 ** FALSE otherwise. 1220 */ 1221 1222 bool 1223 transienterror(err) 1224 int err; 1225 { 1226 switch (err) 1227 { 1228 case EIO: /* I/O error */ 1229 case ENXIO: /* Device not configured */ 1230 case EAGAIN: /* Resource temporarily unavailable */ 1231 case ENOMEM: /* Cannot allocate memory */ 1232 case ENODEV: /* Operation not supported by device */ 1233 case ENFILE: /* Too many open files in system */ 1234 case EMFILE: /* Too many open files */ 1235 case ENOSPC: /* No space left on device */ 1236 #ifdef ETIMEDOUT 1237 case ETIMEDOUT: /* Connection timed out */ 1238 #endif 1239 #ifdef ESTALE 1240 case ESTALE: /* Stale NFS file handle */ 1241 #endif 1242 #ifdef ENETDOWN 1243 case ENETDOWN: /* Network is down */ 1244 #endif 1245 #ifdef ENETUNREACH 1246 case ENETUNREACH: /* Network is unreachable */ 1247 #endif 1248 #ifdef ENETRESET 1249 case ENETRESET: /* Network dropped connection on reset */ 1250 #endif 1251 #ifdef ECONNABORTED 1252 case ECONNABORTED: /* Software caused connection abort */ 1253 #endif 1254 #ifdef ECONNRESET 1255 case ECONNRESET: /* Connection reset by peer */ 1256 #endif 1257 #ifdef ENOBUFS 1258 case ENOBUFS: /* No buffer space available */ 1259 #endif 1260 #ifdef ESHUTDOWN 1261 case ESHUTDOWN: /* Can't send after socket shutdown */ 1262 #endif 1263 #ifdef ECONNREFUSED 1264 case ECONNREFUSED: /* Connection refused */ 1265 #endif 1266 #ifdef EHOSTDOWN 1267 case EHOSTDOWN: /* Host is down */ 1268 #endif 1269 #ifdef EHOSTUNREACH 1270 case EHOSTUNREACH: /* No route to host */ 1271 #endif 1272 #ifdef EDQUOT 1273 case EDQUOT: /* Disc quota exceeded */ 1274 #endif 1275 #ifdef EPROCLIM 1276 case EPROCLIM: /* Too many processes */ 1277 #endif 1278 #ifdef EUSERS 1279 case EUSERS: /* Too many users */ 1280 #endif 1281 #ifdef EDEADLK 1282 case EDEADLK: /* Resource deadlock avoided */ 1283 #endif 1284 #ifdef EISCONN 1285 case EISCONN: /* Socket already connected */ 1286 #endif 1287 #ifdef EINPROGRESS 1288 case EINPROGRESS: /* Operation now in progress */ 1289 #endif 1290 #ifdef EALREADY 1291 case EALREADY: /* Operation already in progress */ 1292 #endif 1293 #ifdef EADDRINUSE 1294 case EADDRINUSE: /* Address already in use */ 1295 #endif 1296 #ifdef EADDRNOTAVAIL 1297 case EADDRNOTAVAIL: /* Can't assign requested address */ 1298 #endif 1299 #if defined(ENOSR) && (!defined(ENOBUFS) || (ENOBUFS != ENOSR)) 1300 case ENOSR: /* Out of streams resources */ 1301 #endif 1302 return TRUE; 1303 } 1304 1305 /* nope, must be permanent */ 1306 return FALSE; 1307 } 1308 /* 1309 ** LOCKFILE -- lock a file using flock or (shudder) lockf 1310 ** 1311 ** Parameters: 1312 ** fd -- the file descriptor of the file. 1313 ** filename -- the file name (for error messages). 1314 ** type -- type of the lock. Bits can be: 1315 ** LOCK_EX -- exclusive lock. 1316 ** LOCK_NB -- non-blocking. 1317 ** 1318 ** Returns: 1319 ** TRUE if the lock was acquired. 1320 ** FALSE otherwise. 1321 */ 1322 1323 bool 1324 lockfile(fd, filename, type) 1325 int fd; 1326 char *filename; 1327 int type; 1328 { 1329 # ifdef LOCKF 1330 int action; 1331 struct flock lfd; 1332 1333 if (bitset(LOCK_UN, type)) 1334 lfd.l_type = F_UNLCK; 1335 else if (bitset(LOCK_EX, type)) 1336 lfd.l_type = F_WRLCK; 1337 else 1338 lfd.l_type = F_RDLCK; 1339 1340 if (bitset(LOCK_NB, type)) 1341 action = F_SETLK; 1342 else 1343 action = F_SETLKW; 1344 1345 lfd.l_whence = lfd.l_start = lfd.l_len = 0; 1346 1347 if (fcntl(fd, action, &lfd) >= 0) 1348 return TRUE; 1349 1350 if (!bitset(LOCK_NB, type) || (errno != EACCES && errno != EAGAIN)) 1351 syserr("cannot lockf(%s, %o)", filename, type); 1352 # else 1353 if (flock(fd, type) >= 0) 1354 return TRUE; 1355 1356 if (!bitset(LOCK_NB, type) || errno != EWOULDBLOCK) 1357 syserr("cannot flock(%s, %o)", filename, type); 1358 # endif 1359 return FALSE; 1360 } 1361