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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Eric P. Allman
        !             3:  * Copyright (c) 1988 Regents of the University of California.
        !             4:  * All rights reserved.
        !             5:  *
        !             6:  * Redistribution and use in source and binary forms are permitted
        !             7:  * provided that the above copyright notice and this paragraph are
        !             8:  * duplicated in all such forms and that any documentation,
        !             9:  * advertising materials, and other materials related to such
        !            10:  * distribution and use acknowledge that the software was developed
        !            11:  * by the University of California, Berkeley.  The name of the
        !            12:  * University may not be used to endorse or promote products derived
        !            13:  * from this software without specific prior written permission.
        !            14:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            15:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            16:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            17:  */
        !            18: 
        !            19: #ifndef lint
        !            20: static char sccsid[] = "@(#)conf.c     5.17 (Berkeley) 6/30/88";
        !            21: #endif /* not lint */
        !            22: 
        !            23: # include <pwd.h>
        !            24: # include <sys/ioctl.h>
        !            25: # ifdef sun
        !            26: # include <sys/param.h>
        !            27: # endif sun
        !            28: # include "sendmail.h"
        !            29: 
        !            30: /*
        !            31: **  CONF.C -- Sendmail Configuration Tables.
        !            32: **
        !            33: **     Defines the configuration of this installation.
        !            34: **
        !            35: **     Compilation Flags:
        !            36: **             VMUNIX -- running on a Berkeley UNIX system.
        !            37: **
        !            38: **     Configuration Variables:
        !            39: **             HdrInfo -- a table describing well-known header fields.
        !            40: **                     Each entry has the field name and some flags,
        !            41: **                     which are described in sendmail.h.
        !            42: **
        !            43: **     Notes:
        !            44: **             I have tried to put almost all the reasonable
        !            45: **             configuration information into the configuration
        !            46: **             file read at runtime.  My intent is that anything
        !            47: **             here is a function of the version of UNIX you
        !            48: **             are running, or is really static -- for example
        !            49: **             the headers are a superset of widely used
        !            50: **             protocols.  If you find yourself playing with
        !            51: **             this file too much, you may be making a mistake!
        !            52: */
        !            53: 
        !            54: 
        !            55: 
        !            56: 
        !            57: /*
        !            58: **  Header info table
        !            59: **     Final (null) entry contains the flags used for any other field.
        !            60: **
        !            61: **     Not all of these are actually handled specially by sendmail
        !            62: **     at this time.  They are included as placeholders, to let
        !            63: **     you know that "someday" I intend to have sendmail do
        !            64: **     something with them.
        !            65: */
        !            66: 
        !            67: struct hdrinfo HdrInfo[] =
        !            68: {
        !            69:                /* originator fields, most to least significant  */
        !            70:        "resent-sender",        H_FROM|H_RESENT,
        !            71:        "resent-from",          H_FROM|H_RESENT,
        !            72:        "resent-reply-to",      H_FROM|H_RESENT,
        !            73:        "sender",               H_FROM,
        !            74:        "from",                 H_FROM,
        !            75:        "reply-to",             H_FROM,
        !            76:        "full-name",            H_ACHECK,
        !            77:        "return-receipt-to",    H_FROM,
        !            78:        "errors-to",            H_FROM,
        !            79:                /* destination fields */
        !            80:        "to",                   H_RCPT,
        !            81:        "resent-to",            H_RCPT|H_RESENT,
        !            82:        "cc",                   H_RCPT,
        !            83:        "resent-cc",            H_RCPT|H_RESENT,
        !            84:        "bcc",                  H_RCPT|H_ACHECK,
        !            85:        "resent-bcc",           H_RCPT|H_ACHECK|H_RESENT,
        !            86:                /* message identification and control */
        !            87:        "message-id",           0,
        !            88:        "resent-message-id",    H_RESENT,
        !            89:        "message",              H_EOH,
        !            90:        "text",                 H_EOH,
        !            91:                /* date fields */
        !            92:        "date",                 0,
        !            93:        "resent-date",          H_RESENT,
        !            94:                /* trace fields */
        !            95:        "received",             H_TRACE|H_FORCE,
        !            96:        "via",                  H_TRACE|H_FORCE,
        !            97:        "mail-from",            H_TRACE|H_FORCE,
        !            98: 
        !            99:        NULL,                   0,
        !           100: };
        !           101: 
        !           102: 
        !           103: /*
        !           104: **  ARPANET error message numbers.
        !           105: */
        !           106: 
        !           107: char   Arpa_Info[] =           "050";  /* arbitrary info */
        !           108: char   Arpa_TSyserr[] =        "451";  /* some (transient) system error */
        !           109: char   Arpa_PSyserr[] =        "554";  /* some (permanent) system error */
        !           110: char   Arpa_Usrerr[] =         "554";  /* some (fatal) user error */
        !           111: 
        !           112: 
        !           113: 
        !           114: /*
        !           115: **  Location of system files/databases/etc.
        !           116: */
        !           117: 
        !           118: char   *ConfFile =     "/usr/lib/sendmail.cf"; /* runtime configuration */
        !           119: char   *FreezeFile =   "/usr/lib/sendmail.fc"; /* frozen version of above */
        !           120: 
        !           121: 
        !           122: 
        !           123: /*
        !           124: **  Miscellaneous stuff.
        !           125: */
        !           126: 
        !           127: int    DtableSize =    50;             /* max open files; reset in 4.2bsd */
        !           128: /*
        !           129: **  SETDEFAULTS -- set default values
        !           130: **
        !           131: **     Because of the way freezing is done, these must be initialized
        !           132: **     using direct code.
        !           133: **
        !           134: **     Parameters:
        !           135: **             none.
        !           136: **
        !           137: **     Returns:
        !           138: **             none.
        !           139: **
        !           140: **     Side Effects:
        !           141: **             Initializes a bunch of global variables to their
        !           142: **             default values.
        !           143: */
        !           144: 
        !           145: setdefaults()
        !           146: {
        !           147:        QueueLA = 8;
        !           148:        QueueFactor = 10000;
        !           149:        RefuseLA = 12;
        !           150:        SpaceSub = ' ';
        !           151:        WkRecipFact = 1000;
        !           152:        WkClassFact = 1800;
        !           153:        WkTimeFact = 9000;
        !           154:        FileMode = 0644;
        !           155:        DefUid = 1;
        !           156:        DefGid = 1;
        !           157: }
        !           158: 
        !           159: /*
        !           160: **  GETRUID -- get real user id (V7)
        !           161: */
        !           162: 
        !           163: getruid()
        !           164: {
        !           165:        if (OpMode == MD_DAEMON)
        !           166:                return (RealUid);
        !           167:        else
        !           168:                return (getuid());
        !           169: }
        !           170: 
        !           171: 
        !           172: /*
        !           173: **  GETRGID -- get real group id (V7).
        !           174: */
        !           175: 
        !           176: getrgid()
        !           177: {
        !           178:        if (OpMode == MD_DAEMON)
        !           179:                return (RealGid);
        !           180:        else
        !           181:                return (getgid());
        !           182: }
        !           183: 
        !           184: /*
        !           185: **  USERNAME -- return the user id of the logged in user.
        !           186: **
        !           187: **     Parameters:
        !           188: **             none.
        !           189: **
        !           190: **     Returns:
        !           191: **             The login name of the logged in user.
        !           192: **
        !           193: **     Side Effects:
        !           194: **             none.
        !           195: **
        !           196: **     Notes:
        !           197: **             The return value is statically allocated.
        !           198: */
        !           199: 
        !           200: char *
        !           201: username()
        !           202: {
        !           203:        static char *myname = NULL;
        !           204:        extern char *getlogin();
        !           205:        register struct passwd *pw;
        !           206:        extern struct passwd *getpwuid();
        !           207: 
        !           208:        /* cache the result */
        !           209:        if (myname == NULL)
        !           210:        {
        !           211:                myname = getlogin();
        !           212:                if (myname == NULL || myname[0] == '\0')
        !           213:                {
        !           214: 
        !           215:                        pw = getpwuid(getruid());
        !           216:                        if (pw != NULL)
        !           217:                                myname = pw->pw_name;
        !           218:                }
        !           219:                else
        !           220:                {
        !           221: 
        !           222:                        pw = getpwnam(myname);
        !           223:                        if(getuid() != pw->pw_uid)
        !           224:                        {
        !           225:                                pw = getpwuid(getuid());
        !           226:                                if (pw != NULL)
        !           227:                                        myname = pw->pw_name;
        !           228:                        }
        !           229:                }
        !           230:                if (myname == NULL || myname[0] == '\0')
        !           231:                {
        !           232:                        syserr("Who are you?");
        !           233:                        myname = "postmaster";
        !           234:                }
        !           235:        }
        !           236: 
        !           237:        return (myname);
        !           238: }
        !           239: /*
        !           240: **  TTYPATH -- Get the path of the user's tty
        !           241: **
        !           242: **     Returns the pathname of the user's tty.  Returns NULL if
        !           243: **     the user is not logged in or if s/he has write permission
        !           244: **     denied.
        !           245: **
        !           246: **     Parameters:
        !           247: **             none
        !           248: **
        !           249: **     Returns:
        !           250: **             pathname of the user's tty.
        !           251: **             NULL if not logged in or write permission denied.
        !           252: **
        !           253: **     Side Effects:
        !           254: **             none.
        !           255: **
        !           256: **     WARNING:
        !           257: **             Return value is in a local buffer.
        !           258: **
        !           259: **     Called By:
        !           260: **             savemail
        !           261: */
        !           262: 
        !           263: # include <sys/stat.h>
        !           264: 
        !           265: char *
        !           266: ttypath()
        !           267: {
        !           268:        struct stat stbuf;
        !           269:        register char *pathn;
        !           270:        extern char *ttyname();
        !           271:        extern char *getlogin();
        !           272: 
        !           273:        /* compute the pathname of the controlling tty */
        !           274:        if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL &&
        !           275:            (pathn = ttyname(0)) == NULL)
        !           276:        {
        !           277:                errno = 0;
        !           278:                return (NULL);
        !           279:        }
        !           280: 
        !           281:        /* see if we have write permission */
        !           282:        if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode))
        !           283:        {
        !           284:                errno = 0;
        !           285:                return (NULL);
        !           286:        }
        !           287: 
        !           288:        /* see if the user is logged in */
        !           289:        if (getlogin() == NULL)
        !           290:                return (NULL);
        !           291: 
        !           292:        /* looks good */
        !           293:        return (pathn);
        !           294: }
        !           295: /*
        !           296: **  CHECKCOMPAT -- check for From and To person compatible.
        !           297: **
        !           298: **     This routine can be supplied on a per-installation basis
        !           299: **     to determine whether a person is allowed to send a message.
        !           300: **     This allows restriction of certain types of internet
        !           301: **     forwarding or registration of users.
        !           302: **
        !           303: **     If the hosts are found to be incompatible, an error
        !           304: **     message should be given using "usrerr" and FALSE should
        !           305: **     be returned.
        !           306: **
        !           307: **     'NoReturn' can be set to suppress the return-to-sender
        !           308: **     function; this should be done on huge messages.
        !           309: **
        !           310: **     Parameters:
        !           311: **             to -- the person being sent to.
        !           312: **
        !           313: **     Returns:
        !           314: **             TRUE -- ok to send.
        !           315: **             FALSE -- not ok.
        !           316: **
        !           317: **     Side Effects:
        !           318: **             none (unless you include the usrerr stuff)
        !           319: */
        !           320: 
        !           321: bool
        !           322: checkcompat(to)
        !           323:        register ADDRESS *to;
        !           324: {
        !           325: # ifdef lint
        !           326:        if (to == NULL)
        !           327:                to++;
        !           328: # endif lint
        !           329: # ifdef EXAMPLE_CODE
        !           330:        /* this code is intended as an example only */
        !           331:        register STAB *s;
        !           332: 
        !           333:        s = stab("arpa", ST_MAILER, ST_FIND);
        !           334:        if (s != NULL && CurEnv->e_from.q_mailer != LocalMailer &&
        !           335:            to->q_mailer == s->s_mailer)
        !           336:        {
        !           337:                usrerr("No ARPA mail through this machine: see your system administration");
        !           338:                /* NoReturn = TRUE; to supress return copy */
        !           339:                return (FALSE);
        !           340:        }
        !           341: # endif EXAMPLE_CODE
        !           342:        return (TRUE);
        !           343: }
        !           344: /*
        !           345: **  HOLDSIGS -- arrange to hold all signals
        !           346: **
        !           347: **     Parameters:
        !           348: **             none.
        !           349: **
        !           350: **     Returns:
        !           351: **             none.
        !           352: **
        !           353: **     Side Effects:
        !           354: **             Arranges that signals are held.
        !           355: */
        !           356: 
        !           357: holdsigs()
        !           358: {
        !           359: }
        !           360: /*
        !           361: **  RLSESIGS -- arrange to release all signals
        !           362: **
        !           363: **     This undoes the effect of holdsigs.
        !           364: **
        !           365: **     Parameters:
        !           366: **             none.
        !           367: **
        !           368: **     Returns:
        !           369: **             none.
        !           370: **
        !           371: **     Side Effects:
        !           372: **             Arranges that signals are released.
        !           373: */
        !           374: 
        !           375: rlsesigs()
        !           376: {
        !           377: }
        !           378: /*
        !           379: **  GETLA -- get the current load average
        !           380: **
        !           381: **     This code stolen from la.c.
        !           382: **
        !           383: **     Parameters:
        !           384: **             none.
        !           385: **
        !           386: **     Returns:
        !           387: **             The current load average as an integer.
        !           388: **
        !           389: **     Side Effects:
        !           390: **             none.
        !           391: */
        !           392: 
        !           393: #ifdef VMUNIX
        !           394: 
        !           395: #include <nlist.h>
        !           396: 
        !           397: struct nlist Nl[] =
        !           398: {
        !           399:        { "_avenrun" },
        !           400: #define        X_AVENRUN       0
        !           401:        { 0 },
        !           402: };
        !           403: 
        !           404: getla()
        !           405: {
        !           406:        static int kmem = -1;
        !           407: # ifdef sun
        !           408:        long avenrun[3];
        !           409: # else
        !           410:        double avenrun[3];
        !           411: # endif
        !           412:        extern off_t lseek();
        !           413: 
        !           414:        if (kmem < 0)
        !           415:        {
        !           416:                kmem = open("/dev/kmem", 0, 0);
        !           417:                if (kmem < 0)
        !           418:                        return (-1);
        !           419:                (void) ioctl(kmem, (int) FIOCLEX, (char *) 0);
        !           420:                nlist("/vmunix", Nl);
        !           421:                if (Nl[0].n_type == 0)
        !           422:                        return (-1);
        !           423:        }
        !           424:        if (lseek(kmem, (off_t) Nl[X_AVENRUN].n_value, 0) == -1 ||
        !           425:            read(kmem, (char *) avenrun, sizeof(avenrun)) < sizeof(avenrun))
        !           426:        {
        !           427:                /* thank you Ian */
        !           428:                return (-1);
        !           429:        }
        !           430: # ifdef sun
        !           431:        return ((int) (avenrun[0] + FSCALE/2) >> FSHIFT);
        !           432: # else
        !           433:        return ((int) (avenrun[0] + 0.5));
        !           434: # endif
        !           435: }
        !           436: 
        !           437: #else VMUNIX
        !           438: 
        !           439: getla()
        !           440: {
        !           441:        return (0);
        !           442: }
        !           443: 
        !           444: #endif VMUNIX
        !           445: /*
        !           446: **  SHOULDQUEUE -- should this message be queued or sent?
        !           447: **
        !           448: **     Compares the message cost to the load average to decide.
        !           449: **
        !           450: **     Parameters:
        !           451: **             pri -- the priority of the message in question.
        !           452: **
        !           453: **     Returns:
        !           454: **             TRUE -- if this message should be queued up for the
        !           455: **                     time being.
        !           456: **             FALSE -- if the load is low enough to send this message.
        !           457: **
        !           458: **     Side Effects:
        !           459: **             none.
        !           460: */
        !           461: 
        !           462: bool
        !           463: shouldqueue(pri)
        !           464:        long pri;
        !           465: {
        !           466:        int la;
        !           467: 
        !           468:        la = getla();
        !           469:        if (la < QueueLA)
        !           470:                return (FALSE);
        !           471:        return (pri > (QueueFactor / (la - QueueLA + 1)));
        !           472: }
        !           473: /*
        !           474: **  SETPROCTITLE -- set process title for ps
        !           475: **
        !           476: **     Parameters:
        !           477: **             fmt -- a printf style format string.
        !           478: **             a, b, c -- possible parameters to fmt.
        !           479: **
        !           480: **     Returns:
        !           481: **             none.
        !           482: **
        !           483: **     Side Effects:
        !           484: **             Clobbers argv of our main procedure so ps(1) will
        !           485: **             display the title.
        !           486: */
        !           487: 
        !           488: /*VARARGS1*/
        !           489: setproctitle(fmt, a, b, c)
        !           490:        char *fmt;
        !           491: {
        !           492: # ifdef SETPROCTITLE
        !           493:        register char *p;
        !           494:        register int i;
        !           495:        extern char **Argv;
        !           496:        extern char *LastArgv;
        !           497:        char buf[MAXLINE];
        !           498: 
        !           499:        (void) sprintf(buf, fmt, a, b, c);
        !           500: 
        !           501:        /* make ps print "(sendmail)" */
        !           502:        p = Argv[0];
        !           503:        *p++ = '-';
        !           504: 
        !           505:        i = strlen(buf);
        !           506:        if (i > LastArgv - p - 2)
        !           507:        {
        !           508:                i = LastArgv - p - 2;
        !           509:                buf[i] = '\0';
        !           510:        }
        !           511:        (void) strcpy(p, buf);
        !           512:        p += i;
        !           513:        while (p < LastArgv)
        !           514:                *p++ = ' ';
        !           515: # endif SETPROCTITLE
        !           516: }
        !           517: /*
        !           518: **  REAPCHILD -- pick up the body of my child, lest it become a zombie
        !           519: **
        !           520: **     Parameters:
        !           521: **             none.
        !           522: **
        !           523: **     Returns:
        !           524: **             none.
        !           525: **
        !           526: **     Side Effects:
        !           527: **             Picks up extant zombies.
        !           528: */
        !           529: 
        !           530: # ifdef VMUNIX
        !           531: # include <sys/wait.h>
        !           532: # endif VMUNIX
        !           533: 
        !           534: reapchild()
        !           535: {
        !           536: # ifdef WNOHANG
        !           537:        union wait status;
        !           538: 
        !           539:        while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0)
        !           540:                continue;
        !           541: # else WNOHANG
        !           542:        auto int status;
        !           543: 
        !           544:        while (wait(&status) > 0)
        !           545:                continue;
        !           546: # endif WNOHANG
        !           547: }

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