import less(1)

[unleashed/tickless.git] / usr / src / lib / libc / port / nsl / 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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/* 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);

                /* LINTED pointer cast */
                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) == 0)
                                /* LINTED pointer alignment */
                                ((struct sockaddr_in *)
                                    tbind->addr.buf)->sin_port = htons(port);
                        else if (strcmp(nconf->nc_protofmly, NC_INET6) == 0)
                                /* LINTED pointer alignment */
                                ((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:
        free(hostname);
        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);
                                        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;
                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) {
                        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) {
                                        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);
}