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Annotation of 43BSDReno/kerberosIV/krb/get_krbhst.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * $Source: /usr/src/kerberosIV/krb/RCS/get_krbhst.c,v $
        !             3:  * $Author: kfall $
        !             4:  *
        !             5:  * Copyright 1985, 1986, 1987, 1988 by the Massachusetts Institute
        !             6:  * of Technology.
        !             7:  *
        !             8:  * For copying and distribution information, please see the file
        !             9:  * <mit-copyright.h>.
        !            10:  */
        !            11: 
        !            12: #ifndef lint
        !            13: static char *rcsid_get_krbhst_c =
        !            14: "$Header: /usr/src/kerberosIV/krb/RCS/get_krbhst.c,v 4.9 90/06/25 20:55:54 kfall Exp $";
        !            15: #endif /* lint */
        !            16: 
        !            17: #include <mit-copyright.h>
        !            18: #include <stdio.h>
        !            19: #include <des.h>
        !            20: #include <krb.h>
        !            21: #include <strings.h>
        !            22: 
        !            23: /*
        !            24:  * Given a Kerberos realm, find a host on which the Kerberos authenti-
        !            25:  * cation server can be found.
        !            26:  *
        !            27:  * krb_get_krbhst takes a pointer to be filled in, a pointer to the name
        !            28:  * of the realm for which a server is desired, and an integer, n, and
        !            29:  * returns (in h) the nth entry from the configuration file (KRB_CONF,
        !            30:  * defined in "krb.h") associated with the specified realm.
        !            31:  *
        !            32:  * On end-of-file, krb_get_krbhst returns KFAILURE.  If n=1 and the
        !            33:  * configuration file does not exist, krb_get_krbhst will return KRB_HOST
        !            34:  * (also defined in "krb.h").  If all goes well, the routine returnes
        !            35:  * KSUCCESS.
        !            36:  *
        !            37:  * The KRB_CONF file contains the name of the local realm in the first
        !            38:  * line (not used by this routine), followed by lines indicating realm/host
        !            39:  * entries.  The words "admin server" following the hostname indicate that 
        !            40:  * the host provides an administrative database server.
        !            41:  *
        !            42:  * For example:
        !            43:  *
        !            44:  *     ATHENA.MIT.EDU
        !            45:  *     ATHENA.MIT.EDU kerberos-1.mit.edu admin server
        !            46:  *     ATHENA.MIT.EDU kerberos-2.mit.edu
        !            47:  *     LCS.MIT.EDU kerberos.lcs.mit.edu admin server
        !            48:  *
        !            49:  * This is a temporary hack to allow us to find the nearest system running
        !            50:  * kerberos.  In the long run, this functionality will be provided by a
        !            51:  * nameserver.
        !            52:  */
        !            53: 
        !            54: krb_get_krbhst(h,r,n)
        !            55:     char *h;
        !            56:     char *r;
        !            57:     int n;
        !            58: {
        !            59:     FILE *cnffile;
        !            60:     char tr[REALM_SZ];
        !            61:     char linebuf[BUFSIZ];
        !            62:     register int i;
        !            63: 
        !            64:     if ((cnffile = fopen(KRB_CONF,"r")) == NULL) {
        !            65:         if (n==1) {
        !            66:             (void) strcpy(h,KRB_HOST);
        !            67:             return(KSUCCESS);
        !            68:         }
        !            69:         else
        !            70:             return(KFAILURE);
        !            71:     }
        !            72:     if (fscanf(cnffile,"%s",tr) == EOF)
        !            73:         return(KFAILURE);
        !            74:     /* run through the file, looking for the nth server for this realm */
        !            75:     for (i = 1; i <= n;) {
        !            76:        if (fgets(linebuf, BUFSIZ, cnffile) == NULL) {
        !            77:             (void) fclose(cnffile);
        !            78:             return(KFAILURE);
        !            79:         }
        !            80:        if (sscanf(linebuf, "%s %s", tr, h) != 2)
        !            81:            continue;
        !            82:         if (!strcmp(tr,r))
        !            83:             i++;
        !            84:     }
        !            85:     (void) fclose(cnffile);
        !            86:     return(KSUCCESS);
        !            87: }

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