libnsl/yp/yp_master.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 1989, 2011, Oracle and/or its affiliates. All rights reserved.
 */

/*  Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * Portions of this source code were derived from Berkeley
 * under license from the Regents of the University of
 * California.
 */

#include "mt.h"
#include <stdlib.h>
#include <unistd.h>
#include <rpc/rpc.h>
#include <sys/types.h>
#include <rpcsvc/yp_b.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#include <string.h>

static int domaster(char *, char *, struct dom_binding *, struct timeval,
    char **);
extern int __yp_master_rsvdport(char *, char *, char **);

/*
 * This checks parameters, and implements the outer "until binding success"
 * loop.
 */
int
yp_master(char *domain, char *map, char **master)
{
    size_t domlen;
    size_t maplen;
    int reason;
    struct dom_binding *pdomb;

    if ((map == NULL) || (domain == NULL))
        return (YPERR_BADARGS);

    domlen = strlen(domain);
    maplen = strlen(map);

    if ((domlen == 0) || (domlen > YPMAXDOMAIN) ||
        (maplen == 0) || (maplen > YPMAXMAP) ||
        (master == NULL))
        return (YPERR_BADARGS);

    for (;;) {

        if (reason = __yp_dobind(domain, &pdomb))
            return (reason);

        if (pdomb->dom_binding->ypbind_hi_vers >= YPVERS) {

            reason = domaster(domain, map, pdomb, _ypserv_timeout,
                master);

            __yp_rel_binding(pdomb);
            if (reason == YPERR_RPC) {
                yp_unbind(domain);
                (void) sleep(_ypsleeptime);
            } else {
                break;
            }
        } else {
            __yp_rel_binding(pdomb);
            return (YPERR_VERS);
        }
    }

    if (reason == YPERR_MAP && geteuid() == 0) {
        /*
         * Lookup could be for a secure map; fail over to retry
         * from a reserved port. Only useful to try this if we're
         * the super user.
         */
        int rsvdreason;
        rsvdreason = __yp_master_rsvdport(domain, map, master);
        if (rsvdreason == 0)
            reason = rsvdreason;
    }

    return (reason);
}


/*
 * This function is identical to 'yp_master' with the exception that it calls
 * '__yp_dobind_rsvdport' rather than '__yp_dobind'
 */
int
__yp_master_rsvdport(char *domain, char *map, char **master)
{
    size_t domlen;
    size_t maplen;
    int reason;
    struct dom_binding *pdomb;

    if ((map == NULL) || (domain == NULL))
        return (YPERR_BADARGS);

    domlen = strlen(domain);
    maplen = strlen(map);

    if ((domlen == 0) || (domlen > YPMAXDOMAIN) ||
        (maplen == 0) || (maplen > YPMAXMAP) ||
        (master == NULL))
        return (YPERR_BADARGS);

    for (;;) {

        if (reason = __yp_dobind_rsvdport(domain, &pdomb))
            return (reason);

        if (pdomb->dom_binding->ypbind_hi_vers >= YPVERS) {

            reason = domaster(domain, map, pdomb, _ypserv_timeout,
                master);

            /*
             * Have to free the binding since the reserved
             * port bindings are not cached.
             */
            __yp_rel_binding(pdomb);
            free_dom_binding(pdomb);
            if (reason == YPERR_RPC) {
                yp_unbind(domain);
                (void) sleep(_ypsleeptime);
            } else {
                break;
            }
        } else {
            /*
             * Have to free the binding since the reserved
             * port bindings are not cached.
             */
            __yp_rel_binding(pdomb);
            free_dom_binding(pdomb);
            return (YPERR_VERS);
        }
    }
    return (reason);
}

/*
 * This talks v2 to ypserv
 */
static int
domaster(char *domain, char *map, struct dom_binding *pdomb,
                    struct timeval timeout, char **master)
{
    struct ypreq_nokey req;
    struct ypresp_master resp;
    unsigned int retval = 0;

    req.domain = domain;
    req.map = map;
    (void) memset(&resp, 0, sizeof (struct ypresp_master));

    /*
     * Do the get_master request.  If the rpc call failed, return with
     * status from this point.
     */

    if (clnt_call(pdomb->dom_client,
        YPPROC_MASTER, (xdrproc_t)xdr_ypreq_nokey,
        (char *)&req, (xdrproc_t)xdr_ypresp_master, (char *)&resp,
        timeout) != RPC_SUCCESS)
        return (YPERR_RPC);

    /* See if the request succeeded */

    if (resp.status != YP_TRUE)
        retval = ypprot_err(resp.status);

    /* Get some memory which the user can get rid of as he likes */

    if (!retval && ((*master = malloc(strlen(resp.master) + 1)) == NULL))
        retval = YPERR_RESRC;

    if (!retval)
        (void) strcpy(*master, resp.master);

    CLNT_FREERES(pdomb->dom_client,
        (xdrproc_t)xdr_ypresp_master, (char *)&resp);
    return (retval);
}