libnsl/rpc/clnt_generic.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
 * 4.3 BSD under license from the Regents of the University of
 * California.
 */

#include "mt.h"
#include "rpc_mt.h"
#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <rpc/rpc.h>
#include <rpc/nettype.h>
#include <netdir.h>
#include <string.h>
#include <syslog.h>

extern int __td_setnodelay(int);
extern bool_t __rpc_is_local_host(const char *);
extern bool_t __rpc_try_doors(const char *, bool_t *);
extern CLIENT *_clnt_vc_create_timed(int, struct netbuf *, rpcprog_t,
            rpcvers_t, uint_t, uint_t, const struct timeval *);

CLIENT *_clnt_tli_create_timed(int, const struct netconfig *, struct netbuf *,
        rpcprog_t, rpcvers_t, uint_t, uint_t, const struct timeval *);

#ifndef NETIDLEN
#define NETIDLEN 32
#endif

/*
 * Generic client creation with version checking the value of
 * vers_out is set to the highest server supported value
 * vers_low <= vers_out <= vers_high  AND an error results
 * if this can not be done.
 *
 * It calls clnt_create_vers_timed() with a NULL value for the timeout
 * pointer, which indicates that the default timeout should be used.
 */
CLIENT *
clnt_create_vers(const char *hostname, const rpcprog_t prog,
    rpcvers_t *vers_out, const rpcvers_t vers_low,
    const rpcvers_t vers_high, const char *nettype)
{
    return (clnt_create_vers_timed(hostname, prog, vers_out, vers_low,
                vers_high, nettype, NULL));
}

/*
 * This routine has the same definition as clnt_create_vers(),
 * except it takes an additional timeout parameter - a pointer to
 * a timeval structure.  A NULL value for the pointer indicates
 * that the default timeout value should be used.
 */
CLIENT *
clnt_create_vers_timed(const char *hostname, const rpcprog_t prog,
    rpcvers_t *vers_out, const rpcvers_t vers_low, const rpcvers_t vers_high,
    const char *nettype, const struct timeval *tp)
{
    CLIENT *clnt;
    struct timeval to;
    enum clnt_stat rpc_stat;
    struct rpc_err rpcerr;
    rpcvers_t v_low, v_high;

    clnt = clnt_create_timed(hostname, prog, vers_high, nettype, tp);
    if (clnt == NULL)
        return (NULL);
    if (tp == NULL) {
        to.tv_sec = 10;
        to.tv_usec = 0;
    } else
        to = *tp;

    rpc_stat = clnt_call(clnt, NULLPROC, (xdrproc_t)xdr_void,
            NULL, (xdrproc_t)xdr_void, NULL, to);
    if (rpc_stat == RPC_SUCCESS) {
        *vers_out = vers_high;
        return (clnt);
    }
    v_low = vers_low;
    v_high = vers_high;
    while (rpc_stat == RPC_PROGVERSMISMATCH && v_high > v_low) {
        unsigned int minvers, maxvers;

        clnt_geterr(clnt, &rpcerr);
        minvers = rpcerr.re_vers.low;
        maxvers = rpcerr.re_vers.high;
        if (maxvers < v_high)
            v_high = maxvers;
        else
            v_high--;
        if (minvers > v_low)
            v_low = minvers;
        if (v_low > v_high) {
            goto error;
        }
        CLNT_CONTROL(clnt, CLSET_VERS, (char *)&v_high);
        rpc_stat = clnt_call(clnt, NULLPROC, (xdrproc_t)xdr_void,
                NULL, (xdrproc_t)xdr_void,
                NULL, to);
        if (rpc_stat == RPC_SUCCESS) {
            *vers_out = v_high;
            return (clnt);
        }
    }
    clnt_geterr(clnt, &rpcerr);

error:
    rpc_createerr.cf_stat = rpc_stat;
    rpc_createerr.cf_error = rpcerr;
    clnt_destroy(clnt);
    return (NULL);
}

/*
 * Top level client creation routine.
 * Generic client creation: takes (servers name, program-number, nettype) and
 * returns client handle. Default options are set, which the user can
 * change using the rpc equivalent of ioctl()'s.
 *
 * It tries for all the netids in that particular class of netid until
 * it succeeds.
 * XXX The error message in the case of failure will be the one
 * pertaining to the last create error.
 *
 * It calls clnt_create_timed() with the default timeout.
 */
CLIENT *
clnt_create(const char *hostname, const rpcprog_t prog, const rpcvers_t vers,
    const char *nettype)
{
    return (clnt_create_timed(hostname, prog, vers, nettype, NULL));
}

/*
 * This the routine has the same definition as clnt_create(),
 * except it takes an additional timeout parameter - a pointer to
 * a timeval structure.  A NULL value for the pointer indicates
 * that the default timeout value should be used.
 *
 * This function calls clnt_tp_create_timed().
 */
CLIENT *
clnt_create_timed(const char *hostname, const rpcprog_t prog,
    const rpcvers_t vers, const char *netclass, const struct timeval *tp)
{
    struct netconfig *nconf;
    CLIENT *clnt = NULL;
    void *handle;
    enum clnt_stat  save_cf_stat = RPC_SUCCESS;
    struct rpc_err  save_cf_error;
    char nettype_array[NETIDLEN];
    char *nettype = &nettype_array[0];
    bool_t try_others;

    if (netclass == NULL)
        nettype = NULL;
    else {
        size_t len = strlen(netclass);
        if (len >= sizeof (nettype_array)) {
            rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
            return (NULL);
        }
        (void) strcpy(nettype, netclass);
    }

    /*
     * Check to see if a rendezvous over doors should be attempted.
     */
    if (__rpc_try_doors(nettype, &try_others)) {
        /*
         * Make sure this is the local host.
         */
        if (__rpc_is_local_host(hostname)) {
            if ((clnt = clnt_door_create(prog, vers, 0)) != NULL)
                return (clnt);
            else {
                if (rpc_createerr.cf_stat == RPC_SYSTEMERROR)
                    return (NULL);
                save_cf_stat = rpc_createerr.cf_stat;
                save_cf_error = rpc_createerr.cf_error;
            }
        } else {
            save_cf_stat = rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        }
    }
    if (!try_others)
        return (NULL);

    if ((handle = __rpc_setconf((char *)nettype)) == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        return (NULL);
    }
    rpc_createerr.cf_stat = RPC_SUCCESS;
    while (clnt == NULL) {
        if ((nconf = __rpc_getconf(handle)) == NULL) {
            if (rpc_createerr.cf_stat == RPC_SUCCESS)
                rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
            break;
        }
        clnt = clnt_tp_create_timed(hostname, prog, vers, nconf, tp);
        if (clnt)
            break;
        else {
            /*
             *  Since we didn't get a name-to-address
             *  translation failure here, we remember
             *  this particular error.  The object of
             *  this is to enable us to return to the
             *  caller a more-specific error than the
             *  unhelpful ``Name to address translation
             *  failed'' which might well occur if we
             *  merely returned the last error (because
             *  the local loopbacks are typically the
             *  last ones in /etc/netconfig and the most
             *  likely to be unable to translate a host
             *  name).  We also check for a more
             *  meaningful error than ``unknown host
             *  name'' for the same reasons.
             */
            if (rpc_createerr.cf_stat == RPC_SYSTEMERROR) {
                syslog(LOG_ERR, "clnt_create_timed: "
                    "RPC_SYSTEMERROR.");
                break;
            }

            if (rpc_createerr.cf_stat != RPC_N2AXLATEFAILURE &&
                rpc_createerr.cf_stat != RPC_UNKNOWNHOST) {
                save_cf_stat = rpc_createerr.cf_stat;
                save_cf_error = rpc_createerr.cf_error;
            }
        }
    }

    /*
     *  Attempt to return an error more specific than ``Name to address
     *  translation failed'' or ``unknown host name''
     */
    if ((rpc_createerr.cf_stat == RPC_N2AXLATEFAILURE ||
                rpc_createerr.cf_stat == RPC_UNKNOWNHOST) &&
                    (save_cf_stat != RPC_SUCCESS)) {
        rpc_createerr.cf_stat = save_cf_stat;
        rpc_createerr.cf_error = save_cf_error;
    }
    __rpc_endconf(handle);
    return (clnt);
}

/*
 * Create a client handle for a well known service or a specific port on
 * host. This routine bypasses rpcbind and can be use to construct a client
 * handle to services that are not registered with rpcbind or where the remote
 * rpcbind is not available, e.g., the remote rpcbind port is blocked by a
 * firewall. We construct a client handle and then ping the service's NULL
 * proc to see that the service is really available. If the caller supplies
 * a non zero port number, the service name is ignored and the port will be
 * used. A non-zero port number limits the protocol family to inet or inet6.
 */

CLIENT *
clnt_create_service_timed(const char *host, const char *service,
            const rpcprog_t prog, const rpcvers_t vers,
            const ushort_t port, const char *netclass,
            const struct timeval *tmout)
{
    int fd;
    void *handle;
    CLIENT *clnt = NULL;
    struct netconfig *nconf;
    struct nd_hostserv hs;
    struct nd_addrlist *raddrs;
    struct t_bind *tbind = NULL;
    struct timeval to;
    char nettype_array[NETIDLEN];
    char *nettype = &nettype_array[0];
    char *hostname, *serv;
    bool_t try_others;

    /*
     * handle const of netclass
     */
    if (netclass == NULL)
        nettype = NULL;
    else {
        size_t len = strlen(netclass);
        if (len >= sizeof (nettype_array)) {
            rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
            return (NULL);
        }
        (void) strcpy(nettype, netclass);
    }

    if (tmout == NULL) {
        to.tv_sec = 10;
        to.tv_usec = 0;
    } else
        to = *tmout;

    if ((handle = __rpc_setconf(nettype)) == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        return (NULL);
    }

    /*
     * Sinct host, and service are const
     */
    if (host == NULL || (hostname = strdup(host)) == NULL) {
        rpc_createerr.cf_stat = RPC_SYSTEMERROR;
        rpc_createerr.cf_error.re_errno = (host ? errno : EINVAL);
        rpc_createerr.cf_error.re_terrno = 0;
        return (NULL);
    }

    if (service == NULL)
        serv = NULL;
    else if ((serv = strdup(service ? service : "")) == NULL) {
        free(hostname);
        rpc_createerr.cf_stat = RPC_SYSTEMERROR;
        rpc_createerr.cf_error.re_errno = errno;
        rpc_createerr.cf_error.re_terrno = 0;
        return (NULL);
    }

    hs.h_host = hostname;
    hs.h_serv = port ? NULL : serv;

    /*
     * Check to see if a rendezvous over doors should be attempted.
     */
    if (__rpc_try_doors(nettype, &try_others)) {
        /*
         * Make sure this is the local host.
         */
        if (__rpc_is_local_host(hostname)) {
            if ((clnt = clnt_door_create(prog, vers, 0)) != NULL)
                goto done;
            else if (rpc_createerr.cf_stat == RPC_SYSTEMERROR)
                goto done;
        } else {
            rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        }
    }
    if (!try_others)
        goto done;

    rpc_createerr.cf_stat = RPC_SUCCESS;
    while (clnt == NULL) {
        tbind = NULL;
        if ((nconf = __rpc_getconf(handle)) == NULL) {
            if (rpc_createerr.cf_stat == RPC_SUCCESS)
                rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
            break;
        }

        if (port) {
            if (strcmp(nconf->nc_protofmly, NC_INET) != 0 &&
                strcmp(nconf->nc_protofmly, NC_INET6) != 0)
                continue;
        }

        if ((fd = t_open(nconf->nc_device, O_RDWR, NULL)) < 0) {
            rpc_createerr.cf_stat = RPC_TLIERROR;
            rpc_createerr.cf_error.re_errno = errno;
            rpc_createerr.cf_error.re_terrno = t_errno;
            continue;
        }

        RPC_RAISEFD(fd);

        __rpc_set_mac_options(fd, nconf, prog);

        if ((tbind = (struct t_bind *)t_alloc(fd, T_BIND, T_ADDR))
            == NULL) {
            (void) t_close(fd);
            rpc_createerr.cf_stat = RPC_TLIERROR;
            rpc_createerr.cf_error.re_errno = errno;
            rpc_createerr.cf_error.re_terrno = t_errno;
            continue;
        }

        if (netdir_getbyname(nconf, &hs, &raddrs) != ND_OK) {
            if (rpc_createerr.cf_stat == RPC_SUCCESS)
                rpc_createerr.cf_stat = RPC_UNKNOWNHOST;
            if (tbind)
                (void) t_free((char *)tbind, T_BIND);
            (void) t_close(fd);
            continue;
        }
        (void) memcpy(tbind->addr.buf, raddrs->n_addrs->buf,
            raddrs->n_addrs->len);
        tbind->addr.len = raddrs->n_addrs->len;
        netdir_free((void *)raddrs, ND_ADDRLIST);

        if (port) {
            if (strcmp(nconf->nc_protofmly, NC_INET) == NULL)
                ((struct sockaddr_in *)
                tbind->addr.buf)->sin_port = htons(port);
            else if (strcmp(nconf->nc_protofmly, NC_INET6) == NULL)
                ((struct sockaddr_in6 *)
                tbind->addr.buf)->sin6_port = htons(port);
        }

        clnt = _clnt_tli_create_timed(fd, nconf, &tbind->addr,
                        prog, vers, 0, 0, &to);

        if (clnt == NULL) {
            if (tbind)
                (void) t_free((char *)tbind, T_BIND);
            (void) t_close(fd);
            continue;
        }

        (void) CLNT_CONTROL(clnt, CLSET_FD_CLOSE, NULL);

        /*
         * Check if we can reach the server with this clnt handle
         * Other clnt_create calls do a ping by contacting the
         * remote rpcbind, here will just try to execute the service's
         * NULL proc.
         */

        rpc_createerr.cf_stat = clnt_call(clnt, NULLPROC,
                        xdr_void, 0, xdr_void, 0, to);

        rpc_createerr.cf_error.re_errno = rpc_callerr.re_status;
        rpc_createerr.cf_error.re_terrno = 0;

        if (rpc_createerr.cf_stat != RPC_SUCCESS) {
            clnt_destroy(clnt);
            clnt = NULL;
            if (tbind)
                (void) t_free((char *)tbind, T_BIND);
            continue;
        } else
            break;
    }

    __rpc_endconf(handle);
    if (tbind)
        (void) t_free((char *)tbind, T_BIND);

done:
    if (hostname)
        free(hostname);
    if (serv)
        free(serv);

    return (clnt);
}

/*
 * Generic client creation: takes (servers name, program-number, netconf) and
 * returns client handle. Default options are set, which the user can
 * change using the rpc equivalent of ioctl()'s : clnt_control()
 * It finds out the server address from rpcbind and calls clnt_tli_create().
 *
 * It calls clnt_tp_create_timed() with the default timeout.
 */
CLIENT *
clnt_tp_create(const char *hostname, const rpcprog_t prog, const rpcvers_t vers,
    const struct netconfig *nconf)
{
    return (clnt_tp_create_timed(hostname, prog, vers, nconf, NULL));
}

/*
 * This has the same definition as clnt_tp_create(), except it
 * takes an additional parameter - a pointer to a timeval structure.
 * A NULL value for the timeout pointer indicates that the default
 * value for the timeout should be used.
 */
CLIENT *
clnt_tp_create_timed(const char *hostname, const rpcprog_t prog,
    const rpcvers_t vers, const struct netconfig *nconf,
    const struct timeval *tp)
{
    struct netbuf *svcaddr;         /* servers address */
    CLIENT *cl = NULL;          /* client handle */
    extern struct netbuf *__rpcb_findaddr_timed(rpcprog_t, rpcvers_t,
        struct netconfig *, char *, CLIENT **, struct timeval *);

    if (nconf == NULL) {
        rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
        return (NULL);
    }

    /*
     * Get the address of the server
     */
    if ((svcaddr = __rpcb_findaddr_timed(prog, vers,
            (struct netconfig *)nconf, (char *)hostname,
            &cl, (struct timeval *)tp)) == NULL) {
        /* appropriate error number is set by rpcbind libraries */
        return (NULL);
    }
    if (cl == NULL) {
        cl = _clnt_tli_create_timed(RPC_ANYFD, nconf, svcaddr,
                    prog, vers, 0, 0, tp);
    } else {
        /* Reuse the CLIENT handle and change the appropriate fields */
        if (CLNT_CONTROL(cl, CLSET_SVC_ADDR, (void *)svcaddr) == TRUE) {
            if (cl->cl_netid == NULL) {
                cl->cl_netid = strdup(nconf->nc_netid);
                if (cl->cl_netid == NULL) {
                    netdir_free((char *)svcaddr, ND_ADDR);
                    rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                    syslog(LOG_ERR,
                        "clnt_tp_create_timed: "
                        "strdup failed.");
                    return (NULL);
                }
            }
            if (cl->cl_tp == NULL) {
                cl->cl_tp = strdup(nconf->nc_device);
                if (cl->cl_tp == NULL) {
                    netdir_free((char *)svcaddr, ND_ADDR);
                    if (cl->cl_netid)
                        free(cl->cl_netid);
                    rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                    syslog(LOG_ERR,
                        "clnt_tp_create_timed: "
                        "strdup failed.");
                    return (NULL);
                }
            }
            (void) CLNT_CONTROL(cl, CLSET_PROG, (void *)&prog);
            (void) CLNT_CONTROL(cl, CLSET_VERS, (void *)&vers);
        } else {
            CLNT_DESTROY(cl);
            cl = _clnt_tli_create_timed(RPC_ANYFD, nconf, svcaddr,
                    prog, vers, 0, 0, tp);
        }
    }
    netdir_free((char *)svcaddr, ND_ADDR);
    return (cl);
}

/*
 * Generic client creation:  returns client handle.
 * Default options are set, which the user can
 * change using the rpc equivalent of ioctl()'s : clnt_control().
 * If fd is RPC_ANYFD, it will be opened using nconf.
 * It will be bound if not so.
 * If sizes are 0; appropriate defaults will be chosen.
 */
CLIENT *
clnt_tli_create(const int fd, const struct netconfig *nconf,
    struct netbuf *svcaddr, const rpcprog_t prog, const rpcvers_t vers,
    const uint_t sendsz, const uint_t recvsz)
{
    return (_clnt_tli_create_timed(fd, nconf, svcaddr, prog, vers, sendsz,
        recvsz, NULL));
}

/*
 * This has the same definition as clnt_tli_create(), except it
 * takes an additional parameter - a pointer to a timeval structure.
 *
 * Not a public interface. This is for clnt_create_timed,
 * clnt_create_vers_times, clnt_tp_create_timed to pass down  the
 * timeout value to COTS creation routine.
 * (for bug 4049792: clnt_create_timed does not time out)
 */
CLIENT *
_clnt_tli_create_timed(int fd, const struct netconfig *nconf,
    struct netbuf *svcaddr, rpcprog_t prog, rpcvers_t vers, uint_t sendsz,
    uint_t recvsz, const struct timeval *tp)
{
    CLIENT *cl;         /* client handle */
    struct t_info tinfo;        /* transport info */
    bool_t madefd;          /* whether fd opened here */
    t_scalar_t servtype;
    int retval;

    if (fd == RPC_ANYFD) {
        if (nconf == NULL) {
            rpc_createerr.cf_stat = RPC_UNKNOWNPROTO;
            return (NULL);
        }

        fd = t_open(nconf->nc_device, O_RDWR, NULL);
        if (fd == -1)
            goto err;
        RPC_RAISEFD(fd);
        madefd = TRUE;
        __rpc_set_mac_options(fd, nconf, prog);
        if (t_bind(fd, NULL, NULL) == -1)
            goto err;
        switch (nconf->nc_semantics) {
        case NC_TPI_CLTS:
            servtype = T_CLTS;
            break;
        case NC_TPI_COTS:
            servtype = T_COTS;
            break;
        case NC_TPI_COTS_ORD:
            servtype = T_COTS_ORD;
            break;
        default:
            if (t_getinfo(fd, &tinfo) == -1)
                goto err;
            servtype = tinfo.servtype;
            break;
        }
    } else {
        int state;      /* Current state of provider */

        /*
         * Sync the opened fd.
         * Check whether bound or not, else bind it
         */
        if (((state = t_sync(fd)) == -1) ||
            ((state == T_UNBND) && (t_bind(fd, NULL, NULL) == -1)) ||
            (t_getinfo(fd, &tinfo) == -1))
            goto err;
        servtype = tinfo.servtype;
        madefd = FALSE;
    }

    switch (servtype) {
    case T_COTS:
        cl = _clnt_vc_create_timed(fd, svcaddr, prog, vers, sendsz,
                recvsz, tp);
        break;
    case T_COTS_ORD:
        if (nconf && ((strcmp(nconf->nc_protofmly, NC_INET) == 0) ||
            (strcmp(nconf->nc_protofmly, NC_INET6) == 0))) {
            retval =  __td_setnodelay(fd);
            if (retval == -1)
                goto err;
        }
        cl = _clnt_vc_create_timed(fd, svcaddr, prog, vers, sendsz,
            recvsz, tp);
        break;
    case T_CLTS:
        cl = clnt_dg_create(fd, svcaddr, prog, vers, sendsz, recvsz);
        break;
    default:
        goto err;
    }

    if (cl == NULL)
        goto err1; /* borrow errors from clnt_dg/vc creates */
    if (nconf) {
        cl->cl_netid = strdup(nconf->nc_netid);
        if (cl->cl_netid == NULL) {
            rpc_createerr.cf_stat = RPC_SYSTEMERROR;
            rpc_createerr.cf_error.re_errno = errno;
            rpc_createerr.cf_error.re_terrno = 0;
            syslog(LOG_ERR,
                "clnt_tli_create: strdup failed");
            goto err1;
        }
        cl->cl_tp = strdup(nconf->nc_device);
        if (cl->cl_tp == NULL) {
            if (cl->cl_netid)
                free(cl->cl_netid);
            rpc_createerr.cf_stat = RPC_SYSTEMERROR;
            rpc_createerr.cf_error.re_errno = errno;
            rpc_createerr.cf_error.re_terrno = 0;
            syslog(LOG_ERR,
                "clnt_tli_create: strdup failed");
            goto err1;
        }
    } else {
        struct netconfig *nc;

        if ((nc = __rpcfd_to_nconf(fd, servtype)) != NULL) {
            if (nc->nc_netid) {
                cl->cl_netid = strdup(nc->nc_netid);
                if (cl->cl_netid == NULL) {
                    rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                    rpc_createerr.cf_error.re_errno = errno;
                    rpc_createerr.cf_error.re_terrno = 0;
                    syslog(LOG_ERR,
                        "clnt_tli_create: "
                        "strdup failed");
                    goto err1;
                }
            }
            if (nc->nc_device) {
                cl->cl_tp = strdup(nc->nc_device);
                if (cl->cl_tp == NULL) {
                    if (cl->cl_netid)
                        free(cl->cl_netid);
                    rpc_createerr.cf_stat = RPC_SYSTEMERROR;
                    rpc_createerr.cf_error.re_errno = errno;
                    rpc_createerr.cf_error.re_terrno = 0;
                    syslog(LOG_ERR,
                        "clnt_tli_create: "
                        "strdup failed");
                    goto err1;
                }
            }
            freenetconfigent(nc);
        }
        if (cl->cl_netid == NULL)
            cl->cl_netid = "";
        if (cl->cl_tp == NULL)
            cl->cl_tp = "";
    }
    if (madefd) {
        (void) CLNT_CONTROL(cl, CLSET_FD_CLOSE, NULL);
/*      (void) CLNT_CONTROL(cl, CLSET_POP_TIMOD, NULL);  */
    };

    return (cl);

err:
    rpc_createerr.cf_stat = RPC_TLIERROR;
    rpc_createerr.cf_error.re_errno = errno;
    rpc_createerr.cf_error.re_terrno = t_errno;
err1:   if (madefd)
        (void) t_close(fd);
    return (NULL);
}

/*
 *  To avoid conflicts with the "magic" file descriptors (0, 1, and 2),
 *  we try to not use them.  The __rpc_raise_fd() routine will dup
 *  a descriptor to a higher value.  If we fail to do it, we continue
 *  to use the old one (and hope for the best).
 */
int
__rpc_raise_fd(int fd)
{
    int nfd;

    if ((nfd = fcntl(fd, F_DUPFD, RPC_MINFD)) == -1)
        return (fd);

    if (t_sync(nfd) == -1) {
        (void) close(nfd);
        return (fd);
    }

    if (t_close(fd) == -1) {
        /* this is okay, we will syslog an error, then use the new fd */
        (void) syslog(LOG_ERR,
            "could not t_close() fd %d; mem & fd leak", fd);
    }

    return (nfd);
}