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Annotation of 42BSD/usr.lib/sendmail/src/conf.c, revision 1.1

1.1     ! root        1: # include <pwd.h>
        !             2: # include <sys/ioctl.h>
        !             3: # include "sendmail.h"
        !             4: 
        !             5: /*
        !             6: **  CONF.C -- Sendmail Configuration Tables.
        !             7: **
        !             8: **     Defines the configuration of this installation.
        !             9: **
        !            10: **     Compilation Flags:
        !            11: **             V6 -- running on a version 6 system.  This determines
        !            12: **                     whether to define certain routines between
        !            13: **                     the two systems.  If you are running a funny
        !            14: **                     system, e.g., V6 with long tty names, this
        !            15: **                     should be checked carefully.
        !            16: **             VMUNIX -- running on a Berkeley UNIX system.
        !            17: **
        !            18: **     Configuration Variables:
        !            19: **             HdrInfo -- a table describing well-known header fields.
        !            20: **                     Each entry has the field name and some flags,
        !            21: **                     which are described in sendmail.h.
        !            22: **
        !            23: **     Notes:
        !            24: **             I have tried to put almost all the reasonable
        !            25: **             configuration information into the configuration
        !            26: **             file read at runtime.  My intent is that anything
        !            27: **             here is a function of the version of UNIX you
        !            28: **             are running, or is really static -- for example
        !            29: **             the headers are a superset of widely used
        !            30: **             protocols.  If you find yourself playing with
        !            31: **             this file too much, you may be making a mistake!
        !            32: */
        !            33: 
        !            34: 
        !            35: 
        !            36: 
        !            37: SCCSID(@(#)conf.c      4.4             8/28/83);
        !            38: 
        !            39: 
        !            40: 
        !            41: /*
        !            42: **  Header info table
        !            43: **     Final (null) entry contains the flags used for any other field.
        !            44: **
        !            45: **     Not all of these are actually handled specially by sendmail
        !            46: **     at this time.  They are included as placeholders, to let
        !            47: **     you know that "someday" I intend to have sendmail do
        !            48: **     something with them.
        !            49: */
        !            50: 
        !            51: struct hdrinfo HdrInfo[] =
        !            52: {
        !            53:                /* originator fields, most to least significant  */
        !            54:        "resent-sender",        H_FROM|H_RESENT,
        !            55:        "resent-from",          H_FROM|H_RESENT,
        !            56:        "sender",               H_FROM,
        !            57:        "from",                 H_FROM,
        !            58:        "full-name",            H_ACHECK,
        !            59:        "return-receipt-to",    H_FROM,
        !            60:        "errors-to",            H_FROM,
        !            61:                /* destination fields */
        !            62:        "to",                   H_RCPT,
        !            63:        "resent-to",            H_RCPT|H_RESENT,
        !            64:        "cc",                   H_RCPT,
        !            65:        "resent-cc",            H_RCPT|H_RESENT,
        !            66:        "bcc",                  H_RCPT|H_ACHECK,
        !            67:        "resent-bcc",           H_RCPT|H_ACHECK|H_RESENT,
        !            68:                /* message identification and control */
        !            69:        "message-id",           0,
        !            70:        "resent-message-id",    H_RESENT,
        !            71:        "message",              H_EOH,
        !            72:        "text",                 H_EOH,
        !            73:                /* date fields */
        !            74:        "date",                 0,
        !            75:        "resent-date",          H_RESENT,
        !            76:                /* trace fields */
        !            77:        "received",             H_TRACE|H_FORCE,
        !            78:        "via",                  H_TRACE|H_FORCE,
        !            79:        "mail-from",            H_TRACE|H_FORCE,
        !            80: 
        !            81:        NULL,                   0,
        !            82: };
        !            83: 
        !            84: 
        !            85: /*
        !            86: **  ARPANET error message numbers.
        !            87: */
        !            88: 
        !            89: char   Arpa_Info[] =           "050";  /* arbitrary info */
        !            90: char   Arpa_TSyserr[] =        "451";  /* some (transient) system error */
        !            91: char   Arpa_PSyserr[] =        "554";  /* some (permanent) system error */
        !            92: char   Arpa_Usrerr[] =         "554";  /* some (fatal) user error */
        !            93: 
        !            94: 
        !            95: 
        !            96: /*
        !            97: **  Location of system files/databases/etc.
        !            98: */
        !            99: 
        !           100: char   *ConfFile =     "/usr/lib/sendmail.cf"; /* runtime configuration */
        !           101: char   *FreezeFile =   "/usr/lib/sendmail.fc"; /* frozen version of above */
        !           102: 
        !           103: 
        !           104: 
        !           105: /*
        !           106: **  Some other configuration....
        !           107: */
        !           108: 
        !           109: char   SpaceSub =      '.';    /* character to replace <lwsp> in addrs */
        !           110: int    QueueLA =       8;      /* load avg > QueueLA -> just queue */
        !           111: int    RefuseLA =      12;     /* load avg > RefuseLA -> refuse connections */
        !           112: 
        !           113: # ifdef V6
        !           114: /*
        !           115: **  TTYNAME -- return name of terminal.
        !           116: **
        !           117: **     Parameters:
        !           118: **             fd -- file descriptor to check.
        !           119: **
        !           120: **     Returns:
        !           121: **             pointer to full path of tty.
        !           122: **             NULL if no tty.
        !           123: **
        !           124: **     Side Effects:
        !           125: **             none.
        !           126: */
        !           127: 
        !           128: char *
        !           129: ttyname(fd)
        !           130:        int fd;
        !           131: {
        !           132:        register char tn;
        !           133:        static char pathn[] = "/dev/ttyx";
        !           134: 
        !           135:        /* compute the pathname of the controlling tty */
        !           136:        if ((tn = ttyn(fd)) == NULL)
        !           137:        {
        !           138:                errno = 0;
        !           139:                return (NULL);
        !           140:        }
        !           141:        pathn[8] = tn;
        !           142:        return (pathn);
        !           143: }
        !           144: /*
        !           145: **  FDOPEN -- Open a stdio file given an open file descriptor.
        !           146: **
        !           147: **     This is included here because it is standard in v7, but we
        !           148: **     need it in v6.
        !           149: **
        !           150: **     Algorithm:
        !           151: **             Open /dev/null to create a descriptor.
        !           152: **             Close that descriptor.
        !           153: **             Copy the existing fd into the descriptor.
        !           154: **
        !           155: **     Parameters:
        !           156: **             fd -- the open file descriptor.
        !           157: **             type -- "r", "w", or whatever.
        !           158: **
        !           159: **     Returns:
        !           160: **             The file descriptor it creates.
        !           161: **
        !           162: **     Side Effects:
        !           163: **             none
        !           164: **
        !           165: **     Called By:
        !           166: **             deliver
        !           167: **
        !           168: **     Notes:
        !           169: **             The mode of fd must match "type".
        !           170: */
        !           171: 
        !           172: FILE *
        !           173: fdopen(fd, type)
        !           174:        int fd;
        !           175:        char *type;
        !           176: {
        !           177:        register FILE *f;
        !           178: 
        !           179:        f = fopen("/dev/null", type);
        !           180:        (void) close(fileno(f));
        !           181:        fileno(f) = fd;
        !           182:        return (f);
        !           183: }
        !           184: /*
        !           185: **  INDEX -- Return pointer to character in string
        !           186: **
        !           187: **     For V7 compatibility.
        !           188: **
        !           189: **     Parameters:
        !           190: **             s -- a string to scan.
        !           191: **             c -- a character to look for.
        !           192: **
        !           193: **     Returns:
        !           194: **             If c is in s, returns the address of the first
        !           195: **                     instance of c in s.
        !           196: **             NULL if c is not in s.
        !           197: **
        !           198: **     Side Effects:
        !           199: **             none.
        !           200: */
        !           201: 
        !           202: char *
        !           203: index(s, c)
        !           204:        register char *s;
        !           205:        register char c;
        !           206: {
        !           207:        while (*s != '\0')
        !           208:        {
        !           209:                if (*s++ == c)
        !           210:                        return (--s);
        !           211:        }
        !           212:        return (NULL);
        !           213: }
        !           214: /*
        !           215: **  UMASK -- fake the umask system call.
        !           216: **
        !           217: **     Since V6 always acts like the umask is zero, we will just
        !           218: **     assume the same thing.
        !           219: */
        !           220: 
        !           221: /*ARGSUSED*/
        !           222: umask(nmask)
        !           223: {
        !           224:        return (0);
        !           225: }
        !           226: 
        !           227: 
        !           228: /*
        !           229: **  GETRUID -- get real user id.
        !           230: */
        !           231: 
        !           232: getruid()
        !           233: {
        !           234:        return (getuid() & 0377);
        !           235: }
        !           236: 
        !           237: 
        !           238: /*
        !           239: **  GETRGID -- get real group id.
        !           240: */
        !           241: 
        !           242: getrgid()
        !           243: {
        !           244:        return (getgid() & 0377);
        !           245: }
        !           246: 
        !           247: 
        !           248: /*
        !           249: **  GETEUID -- get effective user id.
        !           250: */
        !           251: 
        !           252: geteuid()
        !           253: {
        !           254:        return ((getuid() >> 8) & 0377);
        !           255: }
        !           256: 
        !           257: 
        !           258: /*
        !           259: **  GETEGID -- get effective group id.
        !           260: */
        !           261: 
        !           262: getegid()
        !           263: {
        !           264:        return ((getgid() >> 8) & 0377);
        !           265: }
        !           266: 
        !           267: # endif V6
        !           268: 
        !           269: # ifndef V6
        !           270: 
        !           271: /*
        !           272: **  GETRUID -- get real user id (V7)
        !           273: */
        !           274: 
        !           275: getruid()
        !           276: {
        !           277:        if (OpMode == MD_DAEMON)
        !           278:                return (RealUid);
        !           279:        else
        !           280:                return (getuid());
        !           281: }
        !           282: 
        !           283: 
        !           284: /*
        !           285: **  GETRGID -- get real group id (V7).
        !           286: */
        !           287: 
        !           288: getrgid()
        !           289: {
        !           290:        if (OpMode == MD_DAEMON)
        !           291:                return (RealGid);
        !           292:        else
        !           293:                return (getgid());
        !           294: }
        !           295: 
        !           296: # endif V6
        !           297: /*
        !           298: **  USERNAME -- return the user id of the logged in user.
        !           299: **
        !           300: **     Parameters:
        !           301: **             none.
        !           302: **
        !           303: **     Returns:
        !           304: **             The login name of the logged in user.
        !           305: **
        !           306: **     Side Effects:
        !           307: **             none.
        !           308: **
        !           309: **     Notes:
        !           310: **             The return value is statically allocated.
        !           311: */
        !           312: 
        !           313: char *
        !           314: username()
        !           315: {
        !           316:        extern char *getlogin();
        !           317: 
        !           318:        return (getlogin());
        !           319: }
        !           320: /*
        !           321: **  TTYPATH -- Get the path of the user's tty
        !           322: **
        !           323: **     Returns the pathname of the user's tty.  Returns NULL if
        !           324: **     the user is not logged in or if s/he has write permission
        !           325: **     denied.
        !           326: **
        !           327: **     Parameters:
        !           328: **             none
        !           329: **
        !           330: **     Returns:
        !           331: **             pathname of the user's tty.
        !           332: **             NULL if not logged in or write permission denied.
        !           333: **
        !           334: **     Side Effects:
        !           335: **             none.
        !           336: **
        !           337: **     WARNING:
        !           338: **             Return value is in a local buffer.
        !           339: **
        !           340: **     Called By:
        !           341: **             savemail
        !           342: */
        !           343: 
        !           344: # include <sys/stat.h>
        !           345: 
        !           346: char *
        !           347: ttypath()
        !           348: {
        !           349:        struct stat stbuf;
        !           350:        register char *pathn;
        !           351:        extern char *ttyname();
        !           352:        extern char *getlogin();
        !           353: 
        !           354:        /* compute the pathname of the controlling tty */
        !           355:        if ((pathn = ttyname(2)) == NULL && (pathn = ttyname(1)) == NULL &&
        !           356:            (pathn = ttyname(0)) == NULL)
        !           357:        {
        !           358:                errno = 0;
        !           359:                return (NULL);
        !           360:        }
        !           361: 
        !           362:        /* see if we have write permission */
        !           363:        if (stat(pathn, &stbuf) < 0 || !bitset(02, stbuf.st_mode))
        !           364:        {
        !           365:                errno = 0;
        !           366:                return (NULL);
        !           367:        }
        !           368: 
        !           369:        /* see if the user is logged in */
        !           370:        if (getlogin() == NULL)
        !           371:                return (NULL);
        !           372: 
        !           373:        /* looks good */
        !           374:        return (pathn);
        !           375: }
        !           376: /*
        !           377: **  CHECKCOMPAT -- check for From and To person compatible.
        !           378: **
        !           379: **     This routine can be supplied on a per-installation basis
        !           380: **     to determine whether a person is allowed to send a message.
        !           381: **     This allows restriction of certain types of internet
        !           382: **     forwarding or registration of users.
        !           383: **
        !           384: **     If the hosts are found to be incompatible, an error
        !           385: **     message should be given using "usrerr" and FALSE should
        !           386: **     be returned.
        !           387: **
        !           388: **     'NoReturn' can be set to suppress the return-to-sender
        !           389: **     function; this should be done on huge messages.
        !           390: **
        !           391: **     Parameters:
        !           392: **             to -- the person being sent to.
        !           393: **
        !           394: **     Returns:
        !           395: **             TRUE -- ok to send.
        !           396: **             FALSE -- not ok.
        !           397: **
        !           398: **     Side Effects:
        !           399: **             none (unless you include the usrerr stuff)
        !           400: */
        !           401: 
        !           402: bool
        !           403: checkcompat(to)
        !           404:        register ADDRESS *to;
        !           405: {
        !           406: # ifdef lint
        !           407:        if (to == NULL)
        !           408:                to++;
        !           409: # endif lint
        !           410: # ifdef EXAMPLE_CODE
        !           411:        /* this code is intended as an example only */
        !           412:        register STAB *s;
        !           413: 
        !           414:        s = stab("arpa", ST_MAILER, ST_FIND);
        !           415:        if (s != NULL && CurEnv->e_from.q_mailer != LocalMailer &&
        !           416:            to->q_mailer == s->s_mailer)
        !           417:        {
        !           418:                usrerr("No ARPA mail through this machine: see your system administration");
        !           419:                /* NoReturn = TRUE; to supress return copy */
        !           420:                return (FALSE);
        !           421:        }
        !           422: # endif EXAMPLE_CODE
        !           423:        return (TRUE);
        !           424: }
        !           425: /*
        !           426: **  HOLDSIGS -- arrange to hold all signals
        !           427: **
        !           428: **     Parameters:
        !           429: **             none.
        !           430: **
        !           431: **     Returns:
        !           432: **             none.
        !           433: **
        !           434: **     Side Effects:
        !           435: **             Arranges that signals are held.
        !           436: */
        !           437: 
        !           438: holdsigs()
        !           439: {
        !           440: }
        !           441: /*
        !           442: **  RLSESIGS -- arrange to release all signals
        !           443: **
        !           444: **     This undoes the effect of holdsigs.
        !           445: **
        !           446: **     Parameters:
        !           447: **             none.
        !           448: **
        !           449: **     Returns:
        !           450: **             none.
        !           451: **
        !           452: **     Side Effects:
        !           453: **             Arranges that signals are released.
        !           454: */
        !           455: 
        !           456: rlsesigs()
        !           457: {
        !           458: }
        !           459: /*
        !           460: **  GETLA -- get the current load average
        !           461: **
        !           462: **     This code stolen from la.c.
        !           463: **
        !           464: **     Parameters:
        !           465: **             none.
        !           466: **
        !           467: **     Returns:
        !           468: **             The current load average as an integer.
        !           469: **
        !           470: **     Side Effects:
        !           471: **             none.
        !           472: */
        !           473: 
        !           474: #ifdef VMUNIX
        !           475: 
        !           476: #include <nlist.h>
        !           477: 
        !           478: struct nlist Nl[] =
        !           479: {
        !           480:        { "_avenrun" },
        !           481: #define        X_AVENRUN       0
        !           482:        { 0 },
        !           483: };
        !           484: 
        !           485: getla()
        !           486: {
        !           487:        static int kmem = -1;
        !           488:        double avenrun[3];
        !           489: 
        !           490:        if (kmem < 0)
        !           491:        {
        !           492:                kmem = open("/dev/kmem", 0);
        !           493:                if (kmem < 0)
        !           494:                        return (-1);
        !           495:                (void) ioctl(kmem, FIOCLEX, 0);
        !           496:                nlist("/vmunix", Nl);
        !           497:                if (Nl[0].n_type == 0)
        !           498:                        return (-1);
        !           499:        }
        !           500:        (void) lseek(kmem, (long) Nl[X_AVENRUN].n_value, 0);
        !           501:        (void) read(kmem, avenrun, sizeof(avenrun));
        !           502:        return ((int) (avenrun[0] + 0.5));
        !           503: }
        !           504: 
        !           505: #else VMUNIX
        !           506: 
        !           507: getla()
        !           508: {
        !           509:        return (0);
        !           510: }
        !           511: 
        !           512: #endif VMUNIX

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