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 8.1 (Berkeley) 06/07/93"; 11 #endif /* not lint */ 12 13 # include <sys/ioctl.h> 14 # include <sys/param.h> 15 # include <signal.h> 16 # include <pwd.h> 17 # include "sendmail.h" 18 # include "pathnames.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_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 = (getuid() != 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 ** GETRUID -- get real user id (V7) 329 */ 330 331 getruid() 332 { 333 if (OpMode == MD_DAEMON) 334 return (RealUid); 335 else 336 return (getuid()); 337 } 338 339 340 /* 341 ** GETRGID -- get real group id (V7). 342 */ 343 344 getrgid() 345 { 346 if (OpMode == MD_DAEMON) 347 return (RealGid); 348 else 349 return (getgid()); 350 } 351 /* 352 ** USERNAME -- return the user id of the logged in user. 353 ** 354 ** Parameters: 355 ** none. 356 ** 357 ** Returns: 358 ** The login name of the logged in user. 359 ** 360 ** Side Effects: 361 ** none. 362 ** 363 ** Notes: 364 ** The return value is statically allocated. 365 */ 366 367 char * 368 username() 369 { 370 static char *myname = NULL; 371 extern char *getlogin(); 372 register struct passwd *pw; 373 374 /* cache the result */ 375 if (myname == NULL) 376 { 377 myname = getlogin(); 378 if (myname == NULL || myname[0] == '\0') 379 { 380 pw = getpwuid(getruid()); 381 if (pw != NULL) 382 myname = newstr(pw->pw_name); 383 } 384 else 385 { 386 uid_t uid = getuid(); 387 388 myname = newstr(myname); 389 if ((pw = getpwnam(myname)) == NULL || 390 (uid != 0 && uid != pw->pw_uid)) 391 { 392 pw = getpwuid(uid); 393 if (pw != NULL) 394 myname = newstr(pw->pw_name); 395 } 396 } 397 if (myname == NULL || myname[0] == '\0') 398 { 399 syserr("554 Who are you?"); 400 myname = "postmaster"; 401 } 402 } 403 404 return (myname); 405 } 406 /* 407 ** TTYPATH -- Get the path of the user's tty 408 ** 409 ** Returns the pathname of the user's tty. Returns NULL if 410 ** the user is not logged in or if s/he has write permission 411 ** denied. 412 ** 413 ** Parameters: 414 ** none 415 ** 416 ** Returns: 417 ** pathname of the user's tty. 418 ** NULL if not logged in or write permission denied. 419 ** 420 ** Side Effects: 421 ** none. 422 ** 423 ** WARNING: 424 ** Return value is in a local buffer. 425 ** 426 ** Called By: 427 ** savemail 428 */ 429 430 char * 431 ttypath() 432 { 433 struct stat stbuf; 434 register char *pathn; 435 extern char *ttyname(); 436 extern char *getlogin(); 437 438 /* compute the pathname of the controlling tty */ 439 if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL && 440 (pathn = ttyname(0)) == NULL) 441 { 442 errno = 0; 443 return (NULL); 444 } 445 446 /* see if we have write permission */ 447 if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode)) 448 { 449 errno = 0; 450 return (NULL); 451 } 452 453 /* see if the user is logged in */ 454 if (getlogin() == NULL) 455 return (NULL); 456 457 /* looks good */ 458 return (pathn); 459 } 460 /* 461 ** CHECKCOMPAT -- check for From and To person compatible. 462 ** 463 ** This routine can be supplied on a per-installation basis 464 ** to determine whether a person is allowed to send a message. 465 ** This allows restriction of certain types of internet 466 ** forwarding or registration of users. 467 ** 468 ** If the hosts are found to be incompatible, an error 469 ** message should be given using "usrerr" and 0 should 470 ** be returned. 471 ** 472 ** 'NoReturn' can be set to suppress the return-to-sender 473 ** function; this should be done on huge messages. 474 ** 475 ** Parameters: 476 ** to -- the person being sent to. 477 ** 478 ** Returns: 479 ** an exit status 480 ** 481 ** Side Effects: 482 ** none (unless you include the usrerr stuff) 483 */ 484 485 checkcompat(to, e) 486 register ADDRESS *to; 487 register ENVELOPE *e; 488 { 489 # ifdef lint 490 if (to == NULL) 491 to++; 492 # endif lint 493 # ifdef EXAMPLE_CODE 494 /* this code is intended as an example only */ 495 register STAB *s; 496 497 s = stab("arpa", ST_MAILER, ST_FIND); 498 if (s != NULL && e->e_from.q_mailer != LocalMailer && 499 to->q_mailer == s->s_mailer) 500 { 501 usrerr("553 No ARPA mail through this machine: see your system administration"); 502 /* NoReturn = TRUE; to supress return copy */ 503 return (EX_UNAVAILABLE); 504 } 505 # endif /* EXAMPLE_CODE */ 506 return (EX_OK); 507 } 508 /* 509 ** HOLDSIGS -- arrange to hold all signals 510 ** 511 ** Parameters: 512 ** none. 513 ** 514 ** Returns: 515 ** none. 516 ** 517 ** Side Effects: 518 ** Arranges that signals are held. 519 */ 520 521 holdsigs() 522 { 523 } 524 /* 525 ** RLSESIGS -- arrange to release all signals 526 ** 527 ** This undoes the effect of holdsigs. 528 ** 529 ** Parameters: 530 ** none. 531 ** 532 ** Returns: 533 ** none. 534 ** 535 ** Side Effects: 536 ** Arranges that signals are released. 537 */ 538 539 rlsesigs() 540 { 541 } 542 /* 543 ** GETLA -- get the current load average 544 ** 545 ** This code stolen from la.c. 546 ** 547 ** Parameters: 548 ** none. 549 ** 550 ** Returns: 551 ** The current load average as an integer. 552 ** 553 ** Side Effects: 554 ** none. 555 */ 556 557 /* try to guess what style of load average we have */ 558 #define LA_ZERO 1 /* always return load average as zero */ 559 #define LA_INT 2 /* read kmem for avenrun; interpret as int */ 560 #define LA_FLOAT 3 /* read kmem for avenrun; interpret as float */ 561 #define LA_SUBR 4 /* call getloadavg */ 562 563 #ifndef LA_TYPE 564 # if defined(sun) && !defined(BSD) 565 # define LA_TYPE LA_INT 566 # endif 567 # if defined(mips) || defined(__alpha) 568 /* Ultrix or OSF/1 or RISC/os */ 569 # define LA_TYPE LA_INT 570 # define LA_AVENRUN "avenrun" 571 # endif 572 # if defined(__hpux) 573 # define LA_TYPE LA_FLOAT 574 # define LA_AVENRUN "avenrun" 575 # endif 576 577 /* now do the guesses based on general OS type */ 578 # ifndef LA_TYPE 579 # if defined(SYSTEM5) 580 # define LA_TYPE LA_INT 581 # define LA_AVENRUN "avenrun" 582 # else 583 # if defined(BSD) 584 # define LA_TYPE LA_SUBR 585 # else 586 # define LA_TYPE LA_ZERO 587 # endif 588 # endif 589 # endif 590 #endif 591 592 #if (LA_TYPE == LA_INT) || (LA_TYPE == LA_FLOAT) 593 594 #include <nlist.h> 595 596 #ifndef LA_AVENRUN 597 #define LA_AVENRUN "_avenrun" 598 #endif 599 600 /* _PATH_UNIX should be defined in <paths.h> */ 601 #ifndef _PATH_UNIX 602 # if defined(__hpux) 603 # define _PATH_UNIX "/hp-ux" 604 # endif 605 # if defined(mips) && !defined(ultrix) 606 /* powerful RISC/os */ 607 # define _PATH_UNIX "/unix" 608 # endif 609 # if defined(SYSTEM5) 610 # ifndef _PATH_UNIX 611 # define _PATH_UNIX "/unix" 612 # endif 613 # endif 614 # ifndef _PATH_UNIX 615 # define _PATH_UNIX "/vmunix" 616 # endif 617 #endif 618 619 struct nlist Nl[] = 620 { 621 { LA_AVENRUN }, 622 #define X_AVENRUN 0 623 { 0 }, 624 }; 625 626 #ifndef FSHIFT 627 # if defined(unixpc) 628 # define FSHIFT 5 629 # endif 630 631 # if defined(__alpha) 632 # define FSHIFT 10 633 # endif 634 635 # if (LA_TYPE == LA_INT) 636 # define FSHIFT 8 637 # endif 638 #endif 639 640 #if (LA_TYPE == LA_INT) && !defined(FSCALE) 641 # define FSCALE (1 << FSHIFT) 642 #endif 643 644 getla() 645 { 646 static int kmem = -1; 647 #if LA_TYPE == LA_INT 648 long avenrun[3]; 649 #else 650 double avenrun[3]; 651 #endif 652 extern off_t lseek(); 653 extern int errno; 654 655 if (kmem < 0) 656 { 657 kmem = open("/dev/kmem", 0, 0); 658 if (kmem < 0) 659 { 660 if (tTd(3, 1)) 661 printf("getla: open(/dev/kmem): %s\n", 662 errstring(errno)); 663 return (-1); 664 } 665 (void) fcntl(kmem, F_SETFD, 1); 666 if (nlist(_PATH_UNIX, Nl) < 0) 667 { 668 if (tTd(3, 1)) 669 printf("getla: nlist(%s): %s\n", _PATH_UNIX, 670 errstring(errno)); 671 return (-1); 672 } 673 if (Nl[X_AVENRUN].n_value == 0) 674 { 675 if (tTd(3, 1)) 676 printf("getla: nlist(%s, %s) ==> 0\n", 677 _PATH_UNIX, LA_AVENRUN); 678 return (-1); 679 } 680 } 681 if (tTd(3, 20)) 682 printf("getla: symbol address = %#x\n", Nl[X_AVENRUN].n_value); 683 if (lseek(kmem, (off_t) Nl[X_AVENRUN].n_value, 0) == -1 || 684 read(kmem, (char *) avenrun, sizeof(avenrun)) < sizeof(avenrun)) 685 { 686 /* thank you Ian */ 687 if (tTd(3, 1)) 688 printf("getla: lseek or read: %s\n", errstring(errno)); 689 return (-1); 690 } 691 #if LA_TYPE == LA_INT 692 if (tTd(3, 5)) 693 { 694 printf("getla: avenrun = %d", avenrun[0]); 695 if (tTd(3, 15)) 696 printf(", %d, %d", avenrun[1], avenrun[2]); 697 printf("\n"); 698 } 699 if (tTd(3, 1)) 700 printf("getla: %d\n", (int) (avenrun[0] + FSCALE/2) >> FSHIFT); 701 return ((int) (avenrun[0] + FSCALE/2) >> FSHIFT); 702 #else 703 if (tTd(3, 5)) 704 { 705 printf("getla: avenrun = %g", avenrun[0]); 706 if (tTd(3, 15)) 707 printf(", %g, %g", avenrun[1], avenrun[2]); 708 printf("\n"); 709 } 710 if (tTd(3, 1)) 711 printf("getla: %d\n", (int) (avenrun[0] +0.5)); 712 return ((int) (avenrun[0] + 0.5)); 713 #endif 714 } 715 716 #else 717 #if LA_TYPE == LA_SUBR 718 719 getla() 720 { 721 double avenrun[3]; 722 723 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) < 0) 724 { 725 if (tTd(3, 1)) 726 perror("getla: getloadavg failed:"); 727 return (-1); 728 } 729 if (tTd(3, 1)) 730 printf("getla: %d\n", (int) (avenrun[0] +0.5)); 731 return ((int) (avenrun[0] + 0.5)); 732 } 733 734 #else 735 736 getla() 737 { 738 if (tTd(3, 1)) 739 printf("getla: ZERO\n"); 740 return (0); 741 } 742 743 #endif 744 #endif 745 /* 746 ** SHOULDQUEUE -- should this message be queued or sent? 747 ** 748 ** Compares the message cost to the load average to decide. 749 ** 750 ** Parameters: 751 ** pri -- the priority of the message in question. 752 ** ctime -- the message creation time. 753 ** 754 ** Returns: 755 ** TRUE -- if this message should be queued up for the 756 ** time being. 757 ** FALSE -- if the load is low enough to send this message. 758 ** 759 ** Side Effects: 760 ** none. 761 */ 762 763 bool 764 shouldqueue(pri, ctime) 765 long pri; 766 time_t ctime; 767 { 768 if (CurrentLA < QueueLA) 769 return (FALSE); 770 if (CurrentLA >= RefuseLA) 771 return (TRUE); 772 return (pri > (QueueFactor / (CurrentLA - QueueLA + 1))); 773 } 774 /* 775 ** REFUSECONNECTIONS -- decide if connections should be refused 776 ** 777 ** Parameters: 778 ** none. 779 ** 780 ** Returns: 781 ** TRUE if incoming SMTP connections should be refused 782 ** (for now). 783 ** FALSE if we should accept new work. 784 ** 785 ** Side Effects: 786 ** none. 787 */ 788 789 bool 790 refuseconnections() 791 { 792 #ifdef XLA 793 if (!xla_smtp_ok()) 794 return TRUE; 795 #endif 796 797 /* this is probably too simplistic */ 798 return (CurrentLA >= RefuseLA); 799 } 800 /* 801 ** SETPROCTITLE -- set process title for ps 802 ** 803 ** Parameters: 804 ** fmt -- a printf style format string. 805 ** a, b, c -- possible parameters to fmt. 806 ** 807 ** Returns: 808 ** none. 809 ** 810 ** Side Effects: 811 ** Clobbers argv of our main procedure so ps(1) will 812 ** display the title. 813 */ 814 815 #ifdef SETPROCTITLE 816 # ifdef __hpux 817 # include <sys/pstat.h> 818 # endif 819 # ifdef BSD4_4 820 # include <machine/vmparam.h> 821 # include <sys/exec.h> 822 # ifdef PS_STRINGS 823 # define SETPROC_STATIC static 824 # endif 825 # endif 826 # ifndef SETPROC_STATIC 827 # define SETPROC_STATIC 828 # endif 829 #endif 830 831 /*VARARGS1*/ 832 #ifdef __STDC__ 833 setproctitle(char *fmt, ...) 834 #else 835 setproctitle(fmt, va_alist) 836 char *fmt; 837 va_dcl 838 #endif 839 { 840 # ifdef SETPROCTITLE 841 register char *p; 842 register int i; 843 SETPROC_STATIC char buf[MAXLINE]; 844 VA_LOCAL_DECL 845 # ifdef __hpux 846 union pstun pst; 847 # endif 848 extern char **Argv; 849 extern char *LastArgv; 850 851 p = buf; 852 853 /* print sendmail: heading for grep */ 854 (void) strcpy(p, "sendmail: "); 855 p += strlen(p); 856 857 /* print the argument string */ 858 VA_START(fmt); 859 (void) vsprintf(p, fmt, ap); 860 VA_END; 861 862 i = strlen(buf); 863 864 # ifdef __hpux 865 pst.pst_command = buf; 866 pstat(PSTAT_SETCMD, pst, i, 0, 0); 867 # else 868 # ifdef PS_STRINGS 869 PS_STRINGS->ps_nargvstr = 1; 870 PS_STRINGS->ps_argvstr = buf; 871 # else 872 if (i > LastArgv - Argv[0] - 2) 873 { 874 i = LastArgv - Argv[0] - 2; 875 buf[i] = '\0'; 876 } 877 (void) strcpy(Argv[0], buf); 878 p = &Argv[0][i]; 879 while (p < LastArgv) 880 *p++ = ' '; 881 # endif 882 # endif 883 # endif /* SETPROCTITLE */ 884 } 885 /* 886 ** REAPCHILD -- pick up the body of my child, lest it become a zombie 887 ** 888 ** Parameters: 889 ** none. 890 ** 891 ** Returns: 892 ** none. 893 ** 894 ** Side Effects: 895 ** Picks up extant zombies. 896 */ 897 898 # include <sys/wait.h> 899 900 void 901 reapchild() 902 { 903 # ifdef WIFEXITED 904 auto int status; 905 int count; 906 int pid; 907 908 count = 0; 909 while ((pid = waitpid(-1, &status, WNOHANG)) > 0) 910 { 911 if (count++ > 1000) 912 { 913 syslog(LOG_ALERT, "reapchild: waitpid loop: pid=%d, status=%x", 914 pid, status); 915 break; 916 } 917 } 918 # else 919 # ifdef WNOHANG 920 union wait status; 921 922 while (wait3((int *)&status, WNOHANG, (struct rusage *) NULL) > 0) 923 continue; 924 # else /* WNOHANG */ 925 auto int status; 926 927 while (wait(&status) > 0) 928 continue; 929 # endif /* WNOHANG */ 930 # endif 931 # ifdef SYSTEM5 932 (void) signal(SIGCHLD, reapchild); 933 # endif 934 } 935 /* 936 ** UNSETENV -- remove a variable from the environment 937 ** 938 ** Not needed on newer systems. 939 ** 940 ** Parameters: 941 ** name -- the string name of the environment variable to be 942 ** deleted from the current environment. 943 ** 944 ** Returns: 945 ** none. 946 ** 947 ** Globals: 948 ** environ -- a pointer to the current environment. 949 ** 950 ** Side Effects: 951 ** Modifies environ. 952 */ 953 954 #ifdef UNSETENV 955 956 void 957 unsetenv(name) 958 char *name; 959 { 960 extern char **environ; 961 register char **pp; 962 int len = strlen(name); 963 964 for (pp = environ; *pp != NULL; pp++) 965 { 966 if (strncmp(name, *pp, len) == 0 && 967 ((*pp)[len] == '=' || (*pp)[len] == '\0')) 968 break; 969 } 970 971 for (; *pp != NULL; pp++) 972 *pp = pp[1]; 973 } 974 975 #endif /* UNSETENV */ 976 /* 977 ** GETDTABLESIZE -- return number of file descriptors 978 ** 979 ** Only on non-BSD systems 980 ** 981 ** Parameters: 982 ** none 983 ** 984 ** Returns: 985 ** size of file descriptor table 986 ** 987 ** Side Effects: 988 ** none 989 */ 990 991 #ifdef SYSTEM5 992 993 int 994 getdtablesize() 995 { 996 # ifdef _SC_OPEN_MAX 997 return sysconf(_SC_OPEN_MAX); 998 # else 999 return NOFILE; 1000 # endif 1001 } 1002 1003 #endif 1004 /* 1005 ** UNAME -- get the UUCP name of this system. 1006 */ 1007 1008 #ifndef HASUNAME 1009 1010 int 1011 uname(name) 1012 struct utsname *name; 1013 { 1014 FILE *file; 1015 char *n; 1016 1017 name->nodename[0] = '\0'; 1018 1019 /* try /etc/whoami -- one line with the node name */ 1020 if ((file = fopen("/etc/whoami", "r")) != NULL) 1021 { 1022 (void) fgets(name->nodename, NODE_LENGTH + 1, file); 1023 (void) fclose(file); 1024 n = strchr(name->nodename, '\n'); 1025 if (n != NULL) 1026 *n = '\0'; 1027 if (name->nodename[0] != '\0') 1028 return (0); 1029 } 1030 1031 /* try /usr/include/whoami.h -- has a #define somewhere */ 1032 if ((file = fopen("/usr/include/whoami.h", "r")) != NULL) 1033 { 1034 char buf[MAXLINE]; 1035 1036 while (fgets(buf, MAXLINE, file) != NULL) 1037 if (sscanf(buf, "#define sysname \"%*[^\"]\"", 1038 NODE_LENGTH, name->nodename) > 0) 1039 break; 1040 (void) fclose(file); 1041 if (name->nodename[0] != '\0') 1042 return (0); 1043 } 1044 1045 #ifdef TRUST_POPEN 1046 /* 1047 ** Popen is known to have security holes. 1048 */ 1049 1050 /* try uuname -l to return local name */ 1051 if ((file = popen("uuname -l", "r")) != NULL) 1052 { 1053 (void) fgets(name, NODE_LENGTH + 1, file); 1054 (void) pclose(file); 1055 n = strchr(name, '\n'); 1056 if (n != NULL) 1057 *n = '\0'; 1058 if (name->nodename[0] != '\0') 1059 return (0); 1060 } 1061 #endif 1062 1063 return (-1); 1064 } 1065 #endif /* HASUNAME */ 1066 /* 1067 ** INITGROUPS -- initialize groups 1068 ** 1069 ** Stub implementation for System V style systems 1070 */ 1071 1072 #ifndef HASINITGROUPS 1073 # if !defined(SYSTEM5) || defined(__hpux) 1074 # define HASINITGROUPS 1075 # endif 1076 #endif 1077 1078 #ifndef HASINITGROUPS 1079 1080 initgroups(name, basegid) 1081 char *name; 1082 int basegid; 1083 { 1084 return 0; 1085 } 1086 1087 #endif 1088 /* 1089 ** SETSID -- set session id (for non-POSIX systems) 1090 */ 1091 1092 #ifndef HASSETSID 1093 1094 setsid() 1095 { 1096 # ifdef SYSTEM5 1097 setpgrp(); 1098 # endif 1099 } 1100 1101 #endif 1102 /* 1103 ** ENOUGHSPACE -- check to see if there is enough free space on the queue fs 1104 ** 1105 ** Only implemented if you have statfs. 1106 ** 1107 ** Parameters: 1108 ** msize -- the size to check against. If zero, we don't yet 1109 ** know how big the message will be, so just check for 1110 ** a "reasonable" amount. 1111 ** 1112 ** Returns: 1113 ** TRUE if there is enough space. 1114 ** FALSE otherwise. 1115 */ 1116 1117 #ifndef HASSTATFS 1118 # if defined(BSD4_4) || defined(__osf__) 1119 # define HASSTATFS 1120 # endif 1121 #endif 1122 1123 #ifdef HASSTATFS 1124 # undef HASUSTAT 1125 #endif 1126 1127 #if defined(HASUSTAT) 1128 # include <ustat.h> 1129 #endif 1130 1131 #ifdef HASSTATFS 1132 # if defined(sgi) || defined(apollo) 1133 # include <sys/statfs.h> 1134 # else 1135 # if (defined(sun) && !defined(BSD)) || defined(__hpux) 1136 # include <sys/vfs.h> 1137 # else 1138 # include <sys/mount.h> 1139 # endif 1140 # endif 1141 #endif 1142 1143 bool 1144 enoughspace(msize) 1145 long msize; 1146 { 1147 #if defined(HASSTATFS) || defined(HASUSTAT) 1148 # if defined(HASUSTAT) 1149 struct ustat fs; 1150 struct stat statbuf; 1151 # define FSBLOCKSIZE DEV_BSIZE 1152 # define f_bavail f_tfree 1153 # else 1154 # if defined(ultrix) 1155 struct fs_data fs; 1156 # define f_bavail fd_bfreen 1157 # define FSBLOCKSIZE fs.fd_bsize 1158 # else 1159 struct statfs fs; 1160 # define FSBLOCKSIZE fs.f_bsize 1161 # endif 1162 # endif 1163 extern int errno; 1164 1165 if (MinBlocksFree <= 0 && msize <= 0) 1166 { 1167 if (tTd(4, 80)) 1168 printf("enoughspace: no threshold\n"); 1169 return TRUE; 1170 } 1171 1172 # if defined(HASUSTAT) 1173 if (stat(QueueDir, &statbuf) == 0 && ustat(statbuf.st_dev, &fs) == 0) 1174 # else 1175 # if defined(sgi) || defined(apollo) 1176 if (statfs(QueueDir, &fs, sizeof fs, 0) == 0) 1177 # else 1178 # if defined(ultrix) 1179 if (statfs(QueueDir, &fs) > 0) 1180 # else 1181 if (statfs(QueueDir, &fs) == 0) 1182 # endif 1183 # endif 1184 # endif 1185 { 1186 if (tTd(4, 80)) 1187 printf("enoughspace: bavail=%ld, need=%ld\n", 1188 fs.f_bavail, msize); 1189 1190 /* convert msize to block count */ 1191 msize = msize / FSBLOCKSIZE + 1; 1192 if (MinBlocksFree >= 0) 1193 msize += MinBlocksFree; 1194 1195 if (fs.f_bavail < msize) 1196 { 1197 #ifdef LOG 1198 if (LogLevel > 0) 1199 syslog(LOG_ALERT, "%s: low on space (have %ld, need %ld)", 1200 QueueDir, fs.f_bavail, msize); 1201 #endif 1202 return FALSE; 1203 } 1204 } 1205 else if (tTd(4, 80)) 1206 printf("enoughspace failure: min=%ld, need=%ld: %s\n", 1207 MinBlocksFree, msize, errstring(errno)); 1208 #endif 1209 return TRUE; 1210 } 1211 /* 1212 ** TRANSIENTERROR -- tell if an error code indicates a transient failure 1213 ** 1214 ** This looks at an errno value and tells if this is likely to 1215 ** go away if retried later. 1216 ** 1217 ** Parameters: 1218 ** err -- the errno code to classify. 1219 ** 1220 ** Returns: 1221 ** TRUE if this is probably transient. 1222 ** FALSE otherwise. 1223 */ 1224 1225 bool 1226 transienterror(err) 1227 int err; 1228 { 1229 switch (err) 1230 { 1231 case EIO: /* I/O error */ 1232 case ENXIO: /* Device not configured */ 1233 case EAGAIN: /* Resource temporarily unavailable */ 1234 case ENOMEM: /* Cannot allocate memory */ 1235 case ENODEV: /* Operation not supported by device */ 1236 case ENFILE: /* Too many open files in system */ 1237 case EMFILE: /* Too many open files */ 1238 case ENOSPC: /* No space left on device */ 1239 #ifdef ETIMEDOUT 1240 case ETIMEDOUT: /* Connection timed out */ 1241 #endif 1242 #ifdef ESTALE 1243 case ESTALE: /* Stale NFS file handle */ 1244 #endif 1245 #ifdef ENETDOWN 1246 case ENETDOWN: /* Network is down */ 1247 #endif 1248 #ifdef ENETUNREACH 1249 case ENETUNREACH: /* Network is unreachable */ 1250 #endif 1251 #ifdef ENETRESET 1252 case ENETRESET: /* Network dropped connection on reset */ 1253 #endif 1254 #ifdef ECONNABORTED 1255 case ECONNABORTED: /* Software caused connection abort */ 1256 #endif 1257 #ifdef ECONNRESET 1258 case ECONNRESET: /* Connection reset by peer */ 1259 #endif 1260 #ifdef ENOBUFS 1261 case ENOBUFS: /* No buffer space available */ 1262 #endif 1263 #ifdef ESHUTDOWN 1264 case ESHUTDOWN: /* Can't send after socket shutdown */ 1265 #endif 1266 #ifdef ECONNREFUSED 1267 case ECONNREFUSED: /* Connection refused */ 1268 #endif 1269 #ifdef EHOSTDOWN 1270 case EHOSTDOWN: /* Host is down */ 1271 #endif 1272 #ifdef EHOSTUNREACH 1273 case EHOSTUNREACH: /* No route to host */ 1274 #endif 1275 #ifdef EDQUOT 1276 case EDQUOT: /* Disc quota exceeded */ 1277 #endif 1278 #ifdef EPROCLIM 1279 case EPROCLIM: /* Too many processes */ 1280 #endif 1281 #ifdef EUSERS 1282 case EUSERS: /* Too many users */ 1283 #endif 1284 #ifdef EDEADLK 1285 case EDEADLK: /* Resource deadlock avoided */ 1286 #endif 1287 #ifdef EISCONN 1288 case EISCONN: /* Socket already connected */ 1289 #endif 1290 #ifdef EINPROGRESS 1291 case EINPROGRESS: /* Operation now in progress */ 1292 #endif 1293 #ifdef EALREADY 1294 case EALREADY: /* Operation already in progress */ 1295 #endif 1296 #ifdef EADDRINUSE 1297 case EADDRINUSE: /* Address already in use */ 1298 #endif 1299 #ifdef EADDRNOTAVAIL 1300 case EADDRNOTAVAIL: /* Can't assign requested address */ 1301 #endif 1302 #ifdef ENOSR 1303 case ENOSR: /* Out of streams resources */ 1304 #endif 1305 return TRUE; 1306 } 1307 1308 /* nope, must be permanent */ 1309 return FALSE; 1310 } 1311 /* 1312 ** LOCKFILE -- lock a file using flock or (shudder) lockf 1313 ** 1314 ** Parameters: 1315 ** fd -- the file descriptor of the file. 1316 ** filename -- the file name (for error messages). 1317 ** type -- type of the lock. Bits can be: 1318 ** LOCK_EX -- exclusive lock. 1319 ** LOCK_NB -- non-blocking. 1320 ** 1321 ** Returns: 1322 ** TRUE if the lock was acquired. 1323 ** FALSE otherwise. 1324 */ 1325 1326 bool 1327 lockfile(fd, filename, type) 1328 int fd; 1329 char *filename; 1330 int type; 1331 { 1332 # ifdef LOCKF 1333 int action; 1334 struct flock lfd; 1335 1336 if (bitset(LOCK_UN, type)) 1337 lfd.l_type = F_UNLCK; 1338 else if (bitset(LOCK_EX, type)) 1339 lfd.l_type = F_WRLCK; 1340 else 1341 lfd.l_type = F_RDLCK; 1342 1343 if (bitset(LOCK_NB, type)) 1344 action = F_SETLK; 1345 else 1346 action = F_SETLKW; 1347 1348 lfd.l_whence = lfd.l_start = lfd.l_len = 0; 1349 1350 if (fcntl(fd, action, &lfd) >= 0) 1351 return TRUE; 1352 1353 if (!bitset(LOCK_NB, type) || (errno != EACCES && errno != EAGAIN)) 1354 syserr("cannot lockf(%s, %o)", filename, type); 1355 # else 1356 if (flock(fd, type) >= 0) 1357 return TRUE; 1358 1359 if (!bitset(LOCK_NB, type) || errno != EWOULDBLOCK) 1360 syserr("cannot flock(%s, %o)", filename, type); 1361 # endif 1362 return FALSE; 1363 } 1364