43BSDReno/usr.sbin/sendmail/src/conf.c - annotate

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Annotation of 43BSDReno/usr.sbin/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 provided
        !             7:  * that: (1) source distributions retain this entire copyright notice and
        !             8:  * comment, and (2) distributions including binaries display the following
        !             9:  * acknowledgement:  ``This product includes software developed by the
        !            10:  * University of California, Berkeley and its contributors'' in the
        !            11:  * documentation or other materials provided with the distribution and in
        !            12:  * all advertising materials mentioning features or use of this software.
        !            13:  * Neither the name of the University nor the names of its contributors may
        !            14:  * be used to endorse or promote products derived from this software without
        !            15:  * specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  */
        !            20: 
        !            21: #ifndef lint
        !            22: static char sccsid[] = "@(#)conf.c     5.26 (Berkeley) 6/1/90";
        !            23: #endif /* not lint */
        !            24: 
        !            25: # include <sys/ioctl.h>
        !            26: # include <sys/param.h>
        !            27: # include <pwd.h>
        !            28: # include "sendmail.h"
        !            29: # include "pathnames.h"
        !            30: 
        !            31: /*
        !            32: **  CONF.C -- Sendmail Configuration Tables.
        !            33: **
        !            34: **     Defines the configuration of this installation.
        !            35: **
        !            36: **     Compilation Flags:
        !            37: **             VMUNIX -- running on a Berkeley UNIX system.
        !            38: **
        !            39: **     Configuration Variables:
        !            40: **             HdrInfo -- a table describing well-known header fields.
        !            41: **                     Each entry has the field name and some flags,
        !            42: **                     which are described in sendmail.h.
        !            43: **
        !            44: **     Notes:
        !            45: **             I have tried to put almost all the reasonable
        !            46: **             configuration information into the configuration
        !            47: **             file read at runtime.  My intent is that anything
        !            48: **             here is a function of the version of UNIX you
        !            49: **             are running, or is really static -- for example
        !            50: **             the headers are a superset of widely used
        !            51: **             protocols.  If you find yourself playing with
        !            52: **             this file too much, you may be making a mistake!
        !            53: */
        !            54: 
        !            55: 
        !            56: 
        !            57: 
        !            58: /*
        !            59: **  Header info table
        !            60: **     Final (null) entry contains the flags used for any other field.
        !            61: **
        !            62: **     Not all of these are actually handled specially by sendmail
        !            63: **     at this time.  They are included as placeholders, to let
        !            64: **     you know that "someday" I intend to have sendmail do
        !            65: **     something with them.
        !            66: */
        !            67: 
        !            68: struct hdrinfo HdrInfo[] =
        !            69: {
        !            70:                /* originator fields, most to least significant  */
        !            71:        "resent-sender",        H_FROM|H_RESENT,
        !            72:        "resent-from",          H_FROM|H_RESENT,
        !            73:        "resent-reply-to",      H_FROM|H_RESENT,
        !            74:        "sender",               H_FROM,
        !            75:        "from",                 H_FROM,
        !            76:        "reply-to",             H_FROM,
        !            77:        "full-name",            H_ACHECK,
        !            78:        "return-receipt-to",    H_FROM,
        !            79:        "errors-to",            H_FROM,
        !            80:                /* destination fields */
        !            81:        "to",                   H_RCPT,
        !            82:        "resent-to",            H_RCPT|H_RESENT,
        !            83:        "cc",                   H_RCPT,
        !            84:        "resent-cc",            H_RCPT|H_RESENT,
        !            85:        "bcc",                  H_RCPT|H_ACHECK,
        !            86:        "resent-bcc",           H_RCPT|H_ACHECK|H_RESENT,
        !            87:                /* message identification and control */
        !            88:        "message-id",           0,
        !            89:        "resent-message-id",    H_RESENT,
        !            90:        "message",              H_EOH,
        !            91:        "text",                 H_EOH,
        !            92:                /* date fields */
        !            93:        "date",                 0,
        !            94:        "resent-date",          H_RESENT,
        !            95:                /* trace fields */
        !            96:        "received",             H_TRACE|H_FORCE,
        !            97:        "via",                  H_TRACE|H_FORCE,
        !            98:        "mail-from",            H_TRACE|H_FORCE,
        !            99: 
        !           100:        NULL,                   0,
        !           101: };
        !           102: 
        !           103: 
        !           104: /*
        !           105: **  ARPANET error message numbers.
        !           106: */
        !           107: 
        !           108: char   Arpa_Info[] =           "050";  /* arbitrary info */
        !           109: char   Arpa_TSyserr[] =        "451";  /* some (transient) system error */
        !           110: char   Arpa_PSyserr[] =        "554";  /* some (permanent) system error */
        !           111: char   Arpa_Usrerr[] =         "554";  /* some (fatal) user error */
        !           112: 
        !           113: 
        !           114: 
        !           115: /*
        !           116: **  Location of system files/databases/etc.
        !           117: */
        !           118: 
        !           119: char   *ConfFile =     _PATH_SENDMAILCF;       /* runtime configuration */
        !           120: char   *FreezeFile =   _PATH_SENDMAILFC;       /* frozen version of above */
        !           121: 
        !           122: 
        !           123: 
        !           124: /*
        !           125: **  Miscellaneous stuff.
        !           126: */
        !           127: 
        !           128: int    DtableSize =    50;             /* max open files; reset in 4.2bsd */
        !           129: extern int la;                         /* load average */
        !           130: /*
        !           131: **  SETDEFAULTS -- set default values
        !           132: **
        !           133: **     Because of the way freezing is done, these must be initialized
        !           134: **     using direct code.
        !           135: **
        !           136: **     Parameters:
        !           137: **             none.
        !           138: **
        !           139: **     Returns:
        !           140: **             none.
        !           141: **
        !           142: **     Side Effects:
        !           143: **             Initializes a bunch of global variables to their
        !           144: **             default values.
        !           145: */
        !           146: 
        !           147: setdefaults()
        !           148: {
        !           149:        QueueLA = 8;
        !           150:        QueueFactor = 10000;
        !           151:        RefuseLA = 12;
        !           152:        SpaceSub = ' ';
        !           153:        WkRecipFact = 1000;
        !           154:        WkClassFact = 1800;
        !           155:        WkTimeFact = 9000;
        !           156:        FileMode = 0644;
        !           157:        DefUid = 1;
        !           158:        DefGid = 1;
        !           159:        setdefuser();
        !           160: }
        !           161: 
        !           162: 
        !           163: /*
        !           164: **  SETDEFUSER -- set/reset DefUser using DefUid (for initgroups())
        !           165: */
        !           166: 
        !           167: setdefuser()
        !           168: {
        !           169:        struct passwd *defpwent;
        !           170: 
        !           171:        if (DefUser != NULL)
        !           172:                free(DefUser);
        !           173:        if ((defpwent = getpwuid(DefUid)) != NULL)
        !           174:                DefUser = newstr(defpwent->pw_name);
        !           175:        else
        !           176:                DefUser = newstr("nobody");
        !           177: }
        !           178: 
        !           179: 
        !           180: /*
        !           181: **  GETRUID -- get real user id (V7)
        !           182: */
        !           183: 
        !           184: getruid()
        !           185: {
        !           186:        if (OpMode == MD_DAEMON)
        !           187:                return (RealUid);
        !           188:        else
        !           189:                return (getuid());
        !           190: }
        !           191: 
        !           192: 
        !           193: /*
        !           194: **  GETRGID -- get real group id (V7).
        !           195: */
        !           196: 
        !           197: getrgid()
        !           198: {
        !           199:        if (OpMode == MD_DAEMON)
        !           200:                return (RealGid);
        !           201:        else
        !           202:                return (getgid());
        !           203: }
        !           204: 
        !           205: /*
        !           206: **  USERNAME -- return the user id of the logged in user.
        !           207: **
        !           208: **     Parameters:
        !           209: **             none.
        !           210: **
        !           211: **     Returns:
        !           212: **             The login name of the logged in user.
        !           213: **
        !           214: **     Side Effects:
        !           215: **             none.
        !           216: **
        !           217: **     Notes:
        !           218: **             The return value is statically allocated.
        !           219: */
        !           220: 
        !           221: char *
        !           222: username()
        !           223: {
        !           224:        static char *myname = NULL;
        !           225:        extern char *getlogin();
        !           226:        register struct passwd *pw;
        !           227:        extern struct passwd *getpwuid();
        !           228: 
        !           229:        /* cache the result */
        !           230:        if (myname == NULL)
        !           231:        {
        !           232:                myname = getlogin();
        !           233:                if (myname == NULL || myname[0] == '\0')
        !           234:                {
        !           235: 
        !           236:                        pw = getpwuid(getruid());
        !           237:                        if (pw != NULL)
        !           238:                                myname = newstr(pw->pw_name);
        !           239:                }
        !           240:                else
        !           241:                {
        !           242: 
        !           243:                        myname = newstr(myname);
        !           244:                        if ((pw = getpwnam(myname)) == NULL ||
        !           245:                              getuid() != pw->pw_uid)
        !           246:                        {
        !           247:                                pw = getpwuid(getuid());
        !           248:                                if (pw != NULL)
        !           249:                                        myname = newstr(pw->pw_name);
        !           250:                        }
        !           251:                }
        !           252:                if (myname == NULL || myname[0] == '\0')
        !           253:                {
        !           254:                        syserr("Who are you?");
        !           255:                        myname = "postmaster";
        !           256:                }
        !           257:        }
        !           258: 
        !           259:        return (myname);
        !           260: }
        !           261: /*
        !           262: **  TTYPATH -- Get the path of the user's tty
        !           263: **
        !           264: **     Returns the pathname of the user's tty.  Returns NULL if
        !           265: **     the user is not logged in or if s/he has write permission
        !           266: **     denied.
        !           267: **
        !           268: **     Parameters:
        !           269: **             none
        !           270: **
        !           271: **     Returns:
        !           272: **             pathname of the user's tty.
        !           273: **             NULL if not logged in or write permission denied.
        !           274: **
        !           275: **     Side Effects:
        !           276: **             none.
        !           277: **
        !           278: **     WARNING:
        !           279: **             Return value is in a local buffer.
        !           280: **
        !           281: **     Called By:
        !           282: **             savemail
        !           283: */
        !           284: 
        !           285: # include <sys/stat.h>
        !           286: 
        !           287: char *
        !           288: ttypath()
        !           289: {
        !           290:        struct stat stbuf;
        !           291:        register char *pathn;
        !           292:        extern char *ttyname();
        !           293:        extern char *getlogin();
        !           294: 
        !           295:        /* compute the pathname of the controlling tty */
        !           296:        if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL &&
        !           297:            (pathn = ttyname(0)) == NULL)
        !           298:        {
        !           299:                errno = 0;
        !           300:                return (NULL);
        !           301:        }
        !           302: 
        !           303:        /* see if we have write permission */
        !           304:        if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode))
        !           305:        {
        !           306:                errno = 0;
        !           307:                return (NULL);
        !           308:        }
        !           309: 
        !           310:        /* see if the user is logged in */
        !           311:        if (getlogin() == NULL)
        !           312:                return (NULL);
        !           313: 
        !           314:        /* looks good */
        !           315:        return (pathn);
        !           316: }
        !           317: /*
        !           318: **  CHECKCOMPAT -- check for From and To person compatible.
        !           319: **
        !           320: **     This routine can be supplied on a per-installation basis
        !           321: **     to determine whether a person is allowed to send a message.
        !           322: **     This allows restriction of certain types of internet
        !           323: **     forwarding or registration of users.
        !           324: **
        !           325: **     If the hosts are found to be incompatible, an error
        !           326: **     message should be given using "usrerr" and FALSE should
        !           327: **     be returned.
        !           328: **
        !           329: **     'NoReturn' can be set to suppress the return-to-sender
        !           330: **     function; this should be done on huge messages.
        !           331: **
        !           332: **     Parameters:
        !           333: **             to -- the person being sent to.
        !           334: **
        !           335: **     Returns:
        !           336: **             TRUE -- ok to send.
        !           337: **             FALSE -- not ok.
        !           338: **
        !           339: **     Side Effects:
        !           340: **             none (unless you include the usrerr stuff)
        !           341: */
        !           342: 
        !           343: bool
        !           344: checkcompat(to)
        !           345:        register ADDRESS *to;
        !           346: {
        !           347: # ifdef lint
        !           348:        if (to == NULL)
        !           349:                to++;
        !           350: # endif lint
        !           351: # ifdef EXAMPLE_CODE
        !           352:        /* this code is intended as an example only */
        !           353:        register STAB *s;
        !           354: 
        !           355:        s = stab("arpa", ST_MAILER, ST_FIND);
        !           356:        if (s != NULL && CurEnv->e_from.q_mailer != LocalMailer &&
        !           357:            to->q_mailer == s->s_mailer)
        !           358:        {
        !           359:                usrerr("No ARPA mail through this machine: see your system administration");
        !           360:                /* NoReturn = TRUE; to supress return copy */
        !           361:                return (FALSE);
        !           362:        }
        !           363: # endif EXAMPLE_CODE
        !           364:        return (TRUE);
        !           365: }
        !           366: /*
        !           367: **  HOLDSIGS -- arrange to hold all signals
        !           368: **
        !           369: **     Parameters:
        !           370: **             none.
        !           371: **
        !           372: **     Returns:
        !           373: **             none.
        !           374: **
        !           375: **     Side Effects:
        !           376: **             Arranges that signals are held.
        !           377: */
        !           378: 
        !           379: holdsigs()
        !           380: {
        !           381: }
        !           382: /*
        !           383: **  RLSESIGS -- arrange to release all signals
        !           384: **
        !           385: **     This undoes the effect of holdsigs.
        !           386: **
        !           387: **     Parameters:
        !           388: **             none.
        !           389: **
        !           390: **     Returns:
        !           391: **             none.
        !           392: **
        !           393: **     Side Effects:
        !           394: **             Arranges that signals are released.
        !           395: */
        !           396: 
        !           397: rlsesigs()
        !           398: {
        !           399: }
        !           400: /*
        !           401: **  GETLA -- get the current load average
        !           402: **
        !           403: **     This code stolen from la.c.
        !           404: **
        !           405: **     Parameters:
        !           406: **             none.
        !           407: **
        !           408: **     Returns:
        !           409: **             The current load average as an integer.
        !           410: **
        !           411: **     Side Effects:
        !           412: **             none.
        !           413: */
        !           414: 
        !           415: #ifndef sun
        !           416: 
        !           417: getla()
        !           418: {
        !           419:        double avenrun[3];
        !           420: 
        !           421:        if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) < 0)
        !           422:                return (0);
        !           423:        return ((int) (avenrun[0] + 0.5));
        !           424: }
        !           425: 
        !           426: #else /* sun */
        !           427: 
        !           428: #include <nlist.h>
        !           429: 
        !           430: struct nlist Nl[] =
        !           431: {
        !           432:        { "_avenrun" },
        !           433: #define        X_AVENRUN       0
        !           434:        { 0 },
        !           435: };
        !           436: 
        !           437: 
        !           438: extern int la;
        !           439: 
        !           440: getla()
        !           441: {
        !           442:        static int kmem = -1;
        !           443:        long avenrun[3];
        !           444:        extern off_t lseek();
        !           445: 
        !           446:        if (kmem < 0)
        !           447:        {
        !           448:                kmem = open("/dev/kmem", 0, 0);
        !           449:                if (kmem < 0)
        !           450:                        return (-1);
        !           451:                (void) ioctl(kmem, (int) FIOCLEX, (char *) 0);
        !           452:                nlist("/vmunix", Nl);
        !           453:                if (Nl[0].n_type == 0)
        !           454:                        return (-1);
        !           455:        }
        !           456:        if (lseek(kmem, (off_t) Nl[X_AVENRUN].n_value, 0) == -1 ||
        !           457:            read(kmem, (char *) avenrun, sizeof(avenrun)) < sizeof(avenrun))
        !           458:        {
        !           459:                /* thank you Ian */
        !           460:                return (-1);
        !           461:        }
        !           462:        return ((int) (avenrun[0] + FSCALE/2) >> FSHIFT);
        !           463: }
        !           464: 
        !           465: #endif /* sun */
        !           466: /*
        !           467: **  SHOULDQUEUE -- should this message be queued or sent?
        !           468: **
        !           469: **     Compares the message cost to the load average to decide.
        !           470: **
        !           471: **     Parameters:
        !           472: **             pri -- the priority of the message in question.
        !           473: **
        !           474: **     Returns:
        !           475: **             TRUE -- if this message should be queued up for the
        !           476: **                     time being.
        !           477: **             FALSE -- if the load is low enough to send this message.
        !           478: **
        !           479: **     Side Effects:
        !           480: **             none.
        !           481: */
        !           482: 
        !           483: bool
        !           484: shouldqueue(pri)
        !           485:        long pri;
        !           486: {
        !           487:        if (la < QueueLA)
        !           488:                return (FALSE);
        !           489:        return (pri > (QueueFactor / (la - QueueLA + 1)));
        !           490: }
        !           491: /*
        !           492: **  SETPROCTITLE -- set process title for ps
        !           493: **
        !           494: **     Parameters:
        !           495: **             fmt -- a printf style format string.
        !           496: **             a, b, c -- possible parameters to fmt.
        !           497: **
        !           498: **     Returns:
        !           499: **             none.
        !           500: **
        !           501: **     Side Effects:
        !           502: **             Clobbers argv of our main procedure so ps(1) will
        !           503: **             display the title.
        !           504: */
        !           505: 
        !           506: /*VARARGS1*/
        !           507: setproctitle(fmt, a, b, c)
        !           508:        char *fmt;
        !           509: {
        !           510: # ifdef SETPROCTITLE
        !           511:        register char *p;
        !           512:        register int i;
        !           513:        extern char **Argv;
        !           514:        extern char *LastArgv;
        !           515:        char buf[MAXLINE];
        !           516: 
        !           517:        (void) sprintf(buf, fmt, a, b, c);
        !           518: 
        !           519:        /* make ps print "(sendmail)" */
        !           520:        p = Argv[0];
        !           521:        *p++ = '-';
        !           522: 
        !           523:        i = strlen(buf);
        !           524:        if (i > LastArgv - p - 2)
        !           525:        {
        !           526:                i = LastArgv - p - 2;
        !           527:                buf[i] = '\0';
        !           528:        }
        !           529:        (void) strcpy(p, buf);
        !           530:        p += i;
        !           531:        while (p < LastArgv)
        !           532:                *p++ = ' ';
        !           533: # endif SETPROCTITLE
        !           534: }
        !           535: /*
        !           536: **  REAPCHILD -- pick up the body of my child, lest it become a zombie
        !           537: **
        !           538: **     Parameters:
        !           539: **             none.
        !           540: **
        !           541: **     Returns:
        !           542: **             none.
        !           543: **
        !           544: **     Side Effects:
        !           545: **             Picks up extant zombies.
        !           546: */
        !           547: 
        !           548: # ifdef VMUNIX
        !           549: # include <sys/wait.h>
        !           550: # endif VMUNIX
        !           551: 
        !           552: reapchild()
        !           553: {
        !           554: # ifdef WNOHANG
        !           555:        union wait status;
        !           556: 
        !           557:        while (wait3(&status, WNOHANG, (struct rusage *) NULL) > 0)
        !           558:                continue;
        !           559: # else WNOHANG
        !           560:        auto int status;
        !           561: 
        !           562:        while (wait(&status) > 0)
        !           563:                continue;
        !           564: # endif WNOHANG
        !           565: }
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