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Annotation of 43BSD/usr.lib/sendmail/src/conf.c, revision 1.1

1.1     ! root        1: /*
        !             2: **  Sendmail
        !             3: **  Copyright (c) 1983  Eric P. Allman
        !             4: **  Berkeley, California
        !             5: **
        !             6: **  Copyright (c) 1983 Regents of the University of California.
        !             7: **  All rights reserved.  The Berkeley software License Agreement
        !             8: **  specifies the terms and conditions for redistribution.
        !             9: */
        !            10: 
        !            11: #ifndef lint
        !            12: static char    SccsId[] = "@(#)conf.c  5.14 (Berkeley) 1/10/86";
        !            13: #endif not lint
        !            14: 
        !            15: # include <pwd.h>
        !            16: # include <sys/ioctl.h>
        !            17: # ifdef sun
        !            18: # include <sys/param.h>
        !            19: # endif sun
        !            20: # include "sendmail.h"
        !            21: 
        !            22: /*
        !            23: **  CONF.C -- Sendmail Configuration Tables.
        !            24: **
        !            25: **     Defines the configuration of this installation.
        !            26: **
        !            27: **     Compilation Flags:
        !            28: **             V6 -- running on a version 6 system.  This determines
        !            29: **                     whether to define certain routines between
        !            30: **                     the two systems.  If you are running a funny
        !            31: **                     system, e.g., V6 with long tty names, this
        !            32: **                     should be checked carefully.
        !            33: **             VMUNIX -- running on a Berkeley UNIX system.
        !            34: **
        !            35: **     Configuration Variables:
        !            36: **             HdrInfo -- a table describing well-known header fields.
        !            37: **                     Each entry has the field name and some flags,
        !            38: **                     which are described in sendmail.h.
        !            39: **
        !            40: **     Notes:
        !            41: **             I have tried to put almost all the reasonable
        !            42: **             configuration information into the configuration
        !            43: **             file read at runtime.  My intent is that anything
        !            44: **             here is a function of the version of UNIX you
        !            45: **             are running, or is really static -- for example
        !            46: **             the headers are a superset of widely used
        !            47: **             protocols.  If you find yourself playing with
        !            48: **             this file too much, you may be making a mistake!
        !            49: */
        !            50: 
        !            51: 
        !            52: 
        !            53: 
        !            54: /*
        !            55: **  Header info table
        !            56: **     Final (null) entry contains the flags used for any other field.
        !            57: **
        !            58: **     Not all of these are actually handled specially by sendmail
        !            59: **     at this time.  They are included as placeholders, to let
        !            60: **     you know that "someday" I intend to have sendmail do
        !            61: **     something with them.
        !            62: */
        !            63: 
        !            64: struct hdrinfo HdrInfo[] =
        !            65: {
        !            66:                /* originator fields, most to least significant  */
        !            67:        "resent-sender",        H_FROM|H_RESENT,
        !            68:        "resent-from",          H_FROM|H_RESENT,
        !            69:        "resent-reply-to",      H_FROM|H_RESENT,
        !            70:        "sender",               H_FROM,
        !            71:        "from",                 H_FROM,
        !            72:        "reply-to",             H_FROM,
        !            73:        "full-name",            H_ACHECK,
        !            74:        "return-receipt-to",    H_FROM,
        !            75:        "errors-to",            H_FROM,
        !            76:                /* destination fields */
        !            77:        "to",                   H_RCPT,
        !            78:        "resent-to",            H_RCPT|H_RESENT,
        !            79:        "cc",                   H_RCPT,
        !            80:        "resent-cc",            H_RCPT|H_RESENT,
        !            81:        "bcc",                  H_RCPT|H_ACHECK,
        !            82:        "resent-bcc",           H_RCPT|H_ACHECK|H_RESENT,
        !            83:                /* message identification and control */
        !            84:        "message-id",           0,
        !            85:        "resent-message-id",    H_RESENT,
        !            86:        "message",              H_EOH,
        !            87:        "text",                 H_EOH,
        !            88:                /* date fields */
        !            89:        "date",                 0,
        !            90:        "resent-date",          H_RESENT,
        !            91:                /* trace fields */
        !            92:        "received",             H_TRACE|H_FORCE,
        !            93:        "via",                  H_TRACE|H_FORCE,
        !            94:        "mail-from",            H_TRACE|H_FORCE,
        !            95: 
        !            96:        NULL,                   0,
        !            97: };
        !            98: 
        !            99: 
        !           100: /*
        !           101: **  ARPANET error message numbers.
        !           102: */
        !           103: 
        !           104: char   Arpa_Info[] =           "050";  /* arbitrary info */
        !           105: char   Arpa_TSyserr[] =        "451";  /* some (transient) system error */
        !           106: char   Arpa_PSyserr[] =        "554";  /* some (permanent) system error */
        !           107: char   Arpa_Usrerr[] =         "554";  /* some (fatal) user error */
        !           108: 
        !           109: 
        !           110: 
        !           111: /*
        !           112: **  Location of system files/databases/etc.
        !           113: */
        !           114: 
        !           115: char   *ConfFile =     "/usr/lib/sendmail.cf"; /* runtime configuration */
        !           116: char   *FreezeFile =   "/usr/lib/sendmail.fc"; /* frozen version of above */
        !           117: 
        !           118: 
        !           119: 
        !           120: /*
        !           121: **  Miscellaneous stuff.
        !           122: */
        !           123: 
        !           124: int    DtableSize =    50;             /* max open files; reset in 4.2bsd */
        !           125: /*
        !           126: **  SETDEFAULTS -- set default values
        !           127: **
        !           128: **     Because of the way freezing is done, these must be initialized
        !           129: **     using direct code.
        !           130: **
        !           131: **     Parameters:
        !           132: **             none.
        !           133: **
        !           134: **     Returns:
        !           135: **             none.
        !           136: **
        !           137: **     Side Effects:
        !           138: **             Initializes a bunch of global variables to their
        !           139: **             default values.
        !           140: */
        !           141: 
        !           142: setdefaults()
        !           143: {
        !           144:        QueueLA = 8;
        !           145:        QueueFactor = 10000;
        !           146:        RefuseLA = 12;
        !           147:        SpaceSub = ' ';
        !           148:        WkRecipFact = 1000;
        !           149:        WkClassFact = 1800;
        !           150:        WkTimeFact = 9000;
        !           151:        FileMode = 0644;
        !           152:        DefUid = 1;
        !           153:        DefGid = 1;
        !           154: }
        !           155: 
        !           156: # ifdef V6
        !           157: /*
        !           158: **  TTYNAME -- return name of terminal.
        !           159: **
        !           160: **     Parameters:
        !           161: **             fd -- file descriptor to check.
        !           162: **
        !           163: **     Returns:
        !           164: **             pointer to full path of tty.
        !           165: **             NULL if no tty.
        !           166: **
        !           167: **     Side Effects:
        !           168: **             none.
        !           169: */
        !           170: 
        !           171: char *
        !           172: ttyname(fd)
        !           173:        int fd;
        !           174: {
        !           175:        register char tn;
        !           176:        static char pathn[] = "/dev/ttyx";
        !           177: 
        !           178:        /* compute the pathname of the controlling tty */
        !           179:        if ((tn = ttyn(fd)) == NULL)
        !           180:        {
        !           181:                errno = 0;
        !           182:                return (NULL);
        !           183:        }
        !           184:        pathn[8] = tn;
        !           185:        return (pathn);
        !           186: }
        !           187: /*
        !           188: **  FDOPEN -- Open a stdio file given an open file descriptor.
        !           189: **
        !           190: **     This is included here because it is standard in v7, but we
        !           191: **     need it in v6.
        !           192: **
        !           193: **     Algorithm:
        !           194: **             Open /dev/null to create a descriptor.
        !           195: **             Close that descriptor.
        !           196: **             Copy the existing fd into the descriptor.
        !           197: **
        !           198: **     Parameters:
        !           199: **             fd -- the open file descriptor.
        !           200: **             type -- "r", "w", or whatever.
        !           201: **
        !           202: **     Returns:
        !           203: **             The file descriptor it creates.
        !           204: **
        !           205: **     Side Effects:
        !           206: **             none
        !           207: **
        !           208: **     Called By:
        !           209: **             deliver
        !           210: **
        !           211: **     Notes:
        !           212: **             The mode of fd must match "type".
        !           213: */
        !           214: 
        !           215: FILE *
        !           216: fdopen(fd, type)
        !           217:        int fd;
        !           218:        char *type;
        !           219: {
        !           220:        register FILE *f;
        !           221: 
        !           222:        f = fopen("/dev/null", type);
        !           223:        (void) close(fileno(f));
        !           224:        fileno(f) = fd;
        !           225:        return (f);
        !           226: }
        !           227: /*
        !           228: **  INDEX -- Return pointer to character in string
        !           229: **
        !           230: **     For V7 compatibility.
        !           231: **
        !           232: **     Parameters:
        !           233: **             s -- a string to scan.
        !           234: **             c -- a character to look for.
        !           235: **
        !           236: **     Returns:
        !           237: **             If c is in s, returns the address of the first
        !           238: **                     instance of c in s.
        !           239: **             NULL if c is not in s.
        !           240: **
        !           241: **     Side Effects:
        !           242: **             none.
        !           243: */
        !           244: 
        !           245: char *
        !           246: index(s, c)
        !           247:        register char *s;
        !           248:        register char c;
        !           249: {
        !           250:        while (*s != '\0')
        !           251:        {
        !           252:                if (*s++ == c)
        !           253:                        return (--s);
        !           254:        }
        !           255:        return (NULL);
        !           256: }
        !           257: /*
        !           258: **  UMASK -- fake the umask system call.
        !           259: **
        !           260: **     Since V6 always acts like the umask is zero, we will just
        !           261: **     assume the same thing.
        !           262: */
        !           263: 
        !           264: /*ARGSUSED*/
        !           265: umask(nmask)
        !           266: {
        !           267:        return (0);
        !           268: }
        !           269: 
        !           270: 
        !           271: /*
        !           272: **  GETRUID -- get real user id.
        !           273: */
        !           274: 
        !           275: getruid()
        !           276: {
        !           277:        return (getuid() & 0377);
        !           278: }
        !           279: 
        !           280: 
        !           281: /*
        !           282: **  GETRGID -- get real group id.
        !           283: */
        !           284: 
        !           285: getrgid()
        !           286: {
        !           287:        return (getgid() & 0377);
        !           288: }
        !           289: 
        !           290: 
        !           291: /*
        !           292: **  GETEUID -- get effective user id.
        !           293: */
        !           294: 
        !           295: geteuid()
        !           296: {
        !           297:        return ((getuid() >> 8) & 0377);
        !           298: }
        !           299: 
        !           300: 
        !           301: /*
        !           302: **  GETEGID -- get effective group id.
        !           303: */
        !           304: 
        !           305: getegid()
        !           306: {
        !           307:        return ((getgid() >> 8) & 0377);
        !           308: }
        !           309: 
        !           310: # endif V6
        !           311: 
        !           312: # ifndef V6
        !           313: 
        !           314: /*
        !           315: **  GETRUID -- get real user id (V7)
        !           316: */
        !           317: 
        !           318: getruid()
        !           319: {
        !           320:        if (OpMode == MD_DAEMON)
        !           321:                return (RealUid);
        !           322:        else
        !           323:                return (getuid());
        !           324: }
        !           325: 
        !           326: 
        !           327: /*
        !           328: **  GETRGID -- get real group id (V7).
        !           329: */
        !           330: 
        !           331: getrgid()
        !           332: {
        !           333:        if (OpMode == MD_DAEMON)
        !           334:                return (RealGid);
        !           335:        else
        !           336:                return (getgid());
        !           337: }
        !           338: 
        !           339: # endif V6
        !           340: /*
        !           341: **  USERNAME -- return the user id of the logged in user.
        !           342: **
        !           343: **     Parameters:
        !           344: **             none.
        !           345: **
        !           346: **     Returns:
        !           347: **             The login name of the logged in user.
        !           348: **
        !           349: **     Side Effects:
        !           350: **             none.
        !           351: **
        !           352: **     Notes:
        !           353: **             The return value is statically allocated.
        !           354: */
        !           355: 
        !           356: char *
        !           357: username()
        !           358: {
        !           359:        static char *myname = NULL;
        !           360:        extern char *getlogin();
        !           361:        register struct passwd *pw;
        !           362:        extern struct passwd *getpwuid();
        !           363: 
        !           364:        /* cache the result */
        !           365:        if (myname == NULL)
        !           366:        {
        !           367:                myname = getlogin();
        !           368:                if (myname == NULL || myname[0] == '\0')
        !           369:                {
        !           370: 
        !           371:                        pw = getpwuid(getruid());
        !           372:                        if (pw != NULL)
        !           373:                                myname = pw->pw_name;
        !           374:                }
        !           375:                else
        !           376:                {
        !           377: 
        !           378:                        pw = getpwnam(myname);
        !           379:                        if(getuid() != pw->pw_uid)
        !           380:                        {
        !           381:                                pw = getpwuid(getuid());
        !           382:                                if (pw != NULL)
        !           383:                                        myname = pw->pw_name;
        !           384:                        }
        !           385:                }
        !           386:                if (myname == NULL || myname[0] == '\0')
        !           387:                {
        !           388:                        syserr("Who are you?");
        !           389:                        myname = "postmaster";
        !           390:                }
        !           391:        }
        !           392: 
        !           393:        return (myname);
        !           394: }
        !           395: /*
        !           396: **  TTYPATH -- Get the path of the user's tty
        !           397: **
        !           398: **     Returns the pathname of the user's tty.  Returns NULL if
        !           399: **     the user is not logged in or if s/he has write permission
        !           400: **     denied.
        !           401: **
        !           402: **     Parameters:
        !           403: **             none
        !           404: **
        !           405: **     Returns:
        !           406: **             pathname of the user's tty.
        !           407: **             NULL if not logged in or write permission denied.
        !           408: **
        !           409: **     Side Effects:
        !           410: **             none.
        !           411: **
        !           412: **     WARNING:
        !           413: **             Return value is in a local buffer.
        !           414: **
        !           415: **     Called By:
        !           416: **             savemail
        !           417: */
        !           418: 
        !           419: # include <sys/stat.h>
        !           420: 
        !           421: char *
        !           422: ttypath()
        !           423: {
        !           424:        struct stat stbuf;
        !           425:        register char *pathn;
        !           426:        extern char *ttyname();
        !           427:        extern char *getlogin();
        !           428: 
        !           429:        /* compute the pathname of the controlling tty */
        !           430:        if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL &&
        !           431:            (pathn = ttyname(0)) == NULL)
        !           432:        {
        !           433:                errno = 0;
        !           434:                return (NULL);
        !           435:        }
        !           436: 
        !           437:        /* see if we have write permission */
        !           438:        if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode))
        !           439:        {
        !           440:                errno = 0;
        !           441:                return (NULL);
        !           442:        }
        !           443: 
        !           444:        /* see if the user is logged in */
        !           445:        if (getlogin() == NULL)
        !           446:                return (NULL);
        !           447: 
        !           448:        /* looks good */
        !           449:        return (pathn);
        !           450: }
        !           451: /*
        !           452: **  CHECKCOMPAT -- check for From and To person compatible.
        !           453: **
        !           454: **     This routine can be supplied on a per-installation basis
        !           455: **     to determine whether a person is allowed to send a message.
        !           456: **     This allows restriction of certain types of internet
        !           457: **     forwarding or registration of users.
        !           458: **
        !           459: **     If the hosts are found to be incompatible, an error
        !           460: **     message should be given using "usrerr" and FALSE should
        !           461: **     be returned.
        !           462: **
        !           463: **     'NoReturn' can be set to suppress the return-to-sender
        !           464: **     function; this should be done on huge messages.
        !           465: **
        !           466: **     Parameters:
        !           467: **             to -- the person being sent to.
        !           468: **
        !           469: **     Returns:
        !           470: **             TRUE -- ok to send.
        !           471: **             FALSE -- not ok.
        !           472: **
        !           473: **     Side Effects:
        !           474: **             none (unless you include the usrerr stuff)
        !           475: */
        !           476: 
        !           477: bool
        !           478: checkcompat(to)
        !           479:        register ADDRESS *to;
        !           480: {
        !           481: # ifdef lint
        !           482:        if (to == NULL)
        !           483:                to++;
        !           484: # endif lint
        !           485: # ifdef EXAMPLE_CODE
        !           486:        /* this code is intended as an example only */
        !           487:        register STAB *s;
        !           488: 
        !           489:        s = stab("arpa", ST_MAILER, ST_FIND);
        !           490:        if (s != NULL && CurEnv->e_from.q_mailer != LocalMailer &&
        !           491:            to->q_mailer == s->s_mailer)
        !           492:        {
        !           493:                usrerr("No ARPA mail through this machine: see your system administration");
        !           494:                /* NoReturn = TRUE; to supress return copy */
        !           495:                return (FALSE);
        !           496:        }
        !           497: # endif EXAMPLE_CODE
        !           498:        return (TRUE);
        !           499: }
        !           500: /*
        !           501: **  HOLDSIGS -- arrange to hold all signals
        !           502: **
        !           503: **     Parameters:
        !           504: **             none.
        !           505: **
        !           506: **     Returns:
        !           507: **             none.
        !           508: **
        !           509: **     Side Effects:
        !           510: **             Arranges that signals are held.
        !           511: */
        !           512: 
        !           513: holdsigs()
        !           514: {
        !           515: }
        !           516: /*
        !           517: **  RLSESIGS -- arrange to release all signals
        !           518: **
        !           519: **     This undoes the effect of holdsigs.
        !           520: **
        !           521: **     Parameters:
        !           522: **             none.
        !           523: **
        !           524: **     Returns:
        !           525: **             none.
        !           526: **
        !           527: **     Side Effects:
        !           528: **             Arranges that signals are released.
        !           529: */
        !           530: 
        !           531: rlsesigs()
        !           532: {
        !           533: }
        !           534: /*
        !           535: **  GETLA -- get the current load average
        !           536: **
        !           537: **     This code stolen from la.c.
        !           538: **
        !           539: **     Parameters:
        !           540: **             none.
        !           541: **
        !           542: **     Returns:
        !           543: **             The current load average as an integer.
        !           544: **
        !           545: **     Side Effects:
        !           546: **             none.
        !           547: */
        !           548: 
        !           549: #ifdef VMUNIX
        !           550: 
        !           551: #include <nlist.h>
        !           552: 
        !           553: struct nlist Nl[] =
        !           554: {
        !           555:        { "_avenrun" },
        !           556: #define        X_AVENRUN       0
        !           557:        { 0 },
        !           558: };
        !           559: 
        !           560: getla()
        !           561: {
        !           562:        static int kmem = -1;
        !           563: # ifdef sun
        !           564:        long avenrun[3];
        !           565: # else
        !           566:        double avenrun[3];
        !           567: # endif
        !           568:        extern off_t lseek();
        !           569: 
        !           570:        if (kmem < 0)
        !           571:        {
        !           572:                kmem = open("/dev/kmem", 0, 0);
        !           573:                if (kmem < 0)
        !           574:                        return (-1);
        !           575:                (void) ioctl(kmem, (int) FIOCLEX, (char *) 0);
        !           576:                nlist("/vmunix", Nl);
        !           577:                if (Nl[0].n_type == 0)
        !           578:                        return (-1);
        !           579:        }
        !           580:        if (lseek(kmem, (off_t) Nl[X_AVENRUN].n_value, 0) == -1 ||
        !           581:            read(kmem, (char *) avenrun, sizeof(avenrun)) < sizeof(avenrun))
        !           582:        {
        !           583:                /* thank you Ian */
        !           584:                return (-1);
        !           585:        }
        !           586: # ifdef sun
        !           587:        return ((int) (avenrun[0] + FSCALE/2) >> FSHIFT);
        !           588: # else
        !           589:        return ((int) (avenrun[0] + 0.5));
        !           590: # endif
        !           591: }
        !           592: 
        !           593: #else VMUNIX
        !           594: 
        !           595: getla()
        !           596: {
        !           597:        return (0);
        !           598: }
        !           599: 
        !           600: #endif VMUNIX
        !           601: /*
        !           602: **  SHOULDQUEUE -- should this message be queued or sent?
        !           603: **
        !           604: **     Compares the message cost to the load average to decide.
        !           605: **
        !           606: **     Parameters:
        !           607: **             pri -- the priority of the message in question.
        !           608: **
        !           609: **     Returns:
        !           610: **             TRUE -- if this message should be queued up for the
        !           611: **                     time being.
        !           612: **             FALSE -- if the load is low enough to send this message.
        !           613: **
        !           614: **     Side Effects:
        !           615: **             none.
        !           616: */
        !           617: 
        !           618: bool
        !           619: shouldqueue(pri)
        !           620:        long pri;
        !           621: {
        !           622:        int la;
        !           623: 
        !           624:        la = getla();
        !           625:        if (la < QueueLA)
        !           626:                return (FALSE);
        !           627:        return (pri > (QueueFactor / (la - QueueLA + 1)));
        !           628: }
        !           629: /*
        !           630: **  SETPROCTITLE -- set process title for ps
        !           631: **
        !           632: **     Parameters:
        !           633: **             fmt -- a printf style format string.
        !           634: **             a, b, c -- possible parameters to fmt.
        !           635: **
        !           636: **     Returns:
        !           637: **             none.
        !           638: **
        !           639: **     Side Effects:
        !           640: **             Clobbers argv of our main procedure so ps(1) will
        !           641: **             display the title.
        !           642: */
        !           643: 
        !           644: /*VARARGS1*/
        !           645: setproctitle(fmt, a, b, c)
        !           646:        char *fmt;
        !           647: {
        !           648: # ifdef SETPROCTITLE
        !           649:        register char *p;
        !           650:        register int i;
        !           651:        extern char **Argv;
        !           652:        extern char *LastArgv;
        !           653:        char buf[MAXLINE];
        !           654: 
        !           655:        (void) sprintf(buf, fmt, a, b, c);
        !           656: 
        !           657:        /* make ps print "(sendmail)" */
        !           658:        p = Argv[0];
        !           659:        *p++ = '-';
        !           660: 
        !           661:        i = strlen(buf);
        !           662:        if (i > LastArgv - p - 2)
        !           663:        {
        !           664:                i = LastArgv - p - 2;
        !           665:                buf[i] = '\0';
        !           666:        }
        !           667:        (void) strcpy(p, buf);
        !           668:        p += i;
        !           669:        while (p < LastArgv)
        !           670:                *p++ = ' ';
        !           671: # endif SETPROCTITLE
        !           672: }
        !           673: /*
        !           674: **  REAPCHILD -- pick up the body of my child, lest it become a zombie
        !           675: **
        !           676: **     Parameters:
        !           677: **             none.
        !           678: **
        !           679: **     Returns:
        !           680: **             none.
        !           681: **
        !           682: **     Side Effects:
        !           683: **             Picks up extant zombies.
        !           684: */
        !           685: 
        !           686: # ifdef VMUNIX
        !           687: # include <sys/wait.h>
        !           688: # endif VMUNIX
        !           689: 
        !           690: reapchild()
        !           691: {
        !           692: # ifdef WNOHANG
        !           693:        union wait status;
        !           694: 
        !           695:        while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0)
        !           696:                continue;
        !           697: # else WNOHANG
        !           698:        auto int status;
        !           699: 
        !           700:        while (wait(&status) > 0)
        !           701:                continue;
        !           702: # endif WNOHANG
        !           703: }

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