nfs/mount/mount.c

	mount.c revision 92373f0acc32761c8c8b08610cc8ab5e006e96b9
/*
 * 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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*
 * nfs mount
 */

#define NFSCLIENT
#include <locale.h>
#include <stdio.h>
#include <string.h>
#include <memory.h>
#include <stdarg.h>
#include <unistd.h>
#include <ctype.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/param.h>
#include <rpc/rpc.h>
#include <errno.h>
#include <sys/stat.h>
#include <netdb.h>
#include <sys/mount.h>
#include <sys/mntent.h>
#include <sys/mnttab.h>
#include <nfs/nfs.h>
#include <nfs/mount.h>
#include <rpcsvc/mount.h>
#include <sys/pathconf.h>
#include <netdir.h>
#include <netconfig.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <syslog.h>
#include <fslib.h>
#include <deflt.h>
#include <sys/wait.h>
#include "replica.h"
#include <netinet/in.h>
#include <nfs/nfs_sec.h>
#include <rpcsvc/daemon_utils.h>
#include <priv.h>
#include <tsol/label.h>
#include "nfs_subr.h"
#include "webnfs.h"
#include <rpcsvc/nfs4_prot.h>

#ifndef NFS_VERSMAX
#define NFS_VERSMAX 4
#endif
#ifndef NFS_VERSMIN
#define NFS_VERSMIN 2
#endif

#define RET_OK      0
#define RET_RETRY   32
#define RET_ERR     33
#define RET_MNTERR  1000
#define ERR_PROTO_NONE      0
#define ERR_PROTO_INVALID   901
#define ERR_PROTO_UNSUPP    902
#define ERR_NETPATH     903
#define ERR_NOHOST      904
#define ERR_RPCERROR        905

typedef struct err_ret {
    int error_type;
    int error_value;
} err_ret_t;

#define SET_ERR_RET(errst, etype, eval) \
    if (errst) { \
        (errst)->error_type = etype; \
        (errst)->error_value = eval; \
    }

/* number of transports to try */
#define MNT_PREF_LISTLEN    2
#define FIRST_TRY       1
#define SECOND_TRY      2

#define BIGRETRY    10000

/* maximum length of RPC header for NFS messages */
#define NFS_RPC_HDR 432

#define NFS_ARGS_EXTB_secdata(args, secdata) \
    { (args)->nfs_args_ext = NFS_ARGS_EXTB, \
    (args)->nfs_ext_u.nfs_extB.secdata = secdata; }

extern int __clnt_bindresvport();
extern char *nfs_get_qop_name();
extern AUTH * nfs_create_ah();
extern enum snego_stat nfs_sec_nego();

static void usage(void);
static int retry(struct mnttab *, int);
static int set_args(int *, struct nfs_args *, char *, struct mnttab *);
static int get_fh_via_pub(struct nfs_args *, char *, char *, bool_t, bool_t,
    int *, struct netconfig **, ushort_t);
static int get_fh(struct nfs_args *, char *, char *, int *, bool_t,
    struct netconfig **, ushort_t);
static int make_secure(struct nfs_args *, char *, struct netconfig *,
    bool_t, rpcvers_t);
static int mount_nfs(struct mnttab *, int, err_ret_t *);
static int getaddr_nfs(struct nfs_args *, char *, struct netconfig **,
            bool_t, char *, ushort_t, err_ret_t *, bool_t);
static void pr_err(const char *fmt, ...);
static void usage(void);
static struct netbuf *get_addr(char *, rpcprog_t, rpcvers_t,
    struct netconfig **, char *, ushort_t, struct t_info *,
    caddr_t *, bool_t, char *, err_ret_t *);

static struct netbuf *get_the_addr(char *, rpcprog_t, rpcvers_t,
    struct netconfig *, ushort_t, struct t_info *, caddr_t *,
    bool_t, char *, err_ret_t *);

extern int self_check(char *);

static void read_default(void);

static char typename[64];

static int bg = 0;
static int backgrounded = 0;
static int posix = 0;
static int retries = BIGRETRY;
static ushort_t nfs_port = 0;
static char *nfs_proto = NULL;

static int mflg = 0;
static int Oflg = 0;    /* Overlay mounts */
static int qflg = 0;    /* quiet - don't print warnings on bad options */

static char *fstype = MNTTYPE_NFS;

static seconfig_t nfs_sec;
static int sec_opt = 0; /* any security option ? */
static bool_t snego_done;
static void sigusr1(int);

/*
 * list of support services needed
 */
static char *service_list[] = { STATD, LOCKD, NULL };
static char *service_list_v4[] = { STATD, LOCKD, NFS4CBD, NFSMAPID, NULL };

/*
 * These two variables control the NFS version number to be used.
 *
 * nfsvers defaults to 0 which means to use the highest number that
 * both the client and the server support.  It can also be set to
 * a particular value, either 2, 3, or 4 to indicate the version
 * number of choice.  If the server (or the client) do not support
 * the version indicated, then the mount attempt will be failed.
 *
 * nfsvers_to_use is the actual version number found to use.  It
 * is determined in get_fh by pinging the various versions of the
 * NFS service on the server to see which responds positively.
 *
 * nfsretry_vers is the version number set when we retry the mount
 * command with the version decremented from nfsvers_to_use.
 * nfsretry_vers is set from nfsvers_to_use when we retry the mount
 * for errors other than RPC errors; it helps un know why we are
 * retrying. It is an indication that the retry is due to
 * non-RPC errors.
 */
static rpcvers_t nfsvers = 0;
static rpcvers_t nfsvers_to_use = 0;
static rpcvers_t nfsretry_vers = 0;

/*
 * There are the defaults (range) for the client when determining
 * which NFS version to use when probing the server (see above).
 * These will only be used when the vers mount option is not used and
 * these may be reset if /etc/default/nfs is configured to do so.
 */
static rpcvers_t vers_max_default = NFS_VERSMAX_DEFAULT;
static rpcvers_t vers_min_default = NFS_VERSMIN_DEFAULT;

/*
 * This variable controls whether to try the public file handle.
 */
static bool_t public_opt;

int
main(int argc, char *argv[])
{
    struct mnttab mnt;
    extern char *optarg;
    extern int optind;
    char optbuf[MAX_MNTOPT_STR];
    int ro = 0;
    int r;
    int c;
    char *myname;
    err_ret_t retry_error;

    (void) setlocale(LC_ALL, "");
#if !defined(TEXT_DOMAIN)
#define TEXT_DOMAIN "SYS_TEST"
#endif
    (void) textdomain(TEXT_DOMAIN);

    myname = strrchr(argv[0], '/');
    myname = myname ? myname + 1 : argv[0];
    (void) snprintf(typename, sizeof (typename), "%s %s",
        MNTTYPE_NFS, myname);
    argv[0] = typename;

    mnt.mnt_mntopts = optbuf;
    (void) strcpy(optbuf, "rw");

    /*
     * Set options
     */
    while ((c = getopt(argc, argv, "ro:mOq")) != EOF) {
        switch (c) {
        case 'r':
            ro++;
            break;
        case 'o':
            if (strlen(optarg) >= MAX_MNTOPT_STR) {
                pr_err(gettext("option string too long"));
                return (RET_ERR);
            }
            (void) strcpy(mnt.mnt_mntopts, optarg);
#ifdef LATER                    /* XXX */
            if (strstr(optarg, MNTOPT_REMOUNT)) {
                /*
                 * If remount is specified, only rw is allowed.
                 */
                if ((strcmp(optarg, MNTOPT_REMOUNT) != 0) &&
                    (strcmp(optarg, "remount,rw") != 0) &&
                    (strcmp(optarg, "rw,remount") != 0)) {
                    pr_err(gettext("Invalid options\n"));
                    exit(RET_ERR);
                }
            }
#endif /* LATER */              /* XXX */
            break;
        case 'm':
            mflg++;
            break;
        case 'O':
            Oflg++;
            break;
        case 'q':
            qflg++;
            break;
        default:
            usage();
            exit(RET_ERR);
        }
    }
    if (argc - optind != 2) {
        usage();
        exit(RET_ERR);
    }

    mnt.mnt_special = argv[optind];
    mnt.mnt_mountp = argv[optind+1];

    if (!priv_ineffect(PRIV_SYS_MOUNT) ||
        !priv_ineffect(PRIV_NET_PRIVADDR)) {
        pr_err(gettext("insufficient privileges\n"));
        exit(RET_ERR);
    }

    /*
     * On a labeled system, allow read-down nfs mounts if privileged
     * (PRIV_NET_MAC_AWARE) to do so.  Otherwise, ignore the error
     * and "mount equal label only" behavior will result.
     */
    if (is_system_labeled())
        (void) setpflags(NET_MAC_AWARE, 1);

    /*
     * Read the defaults file to see if the min/max versions have
     * been set and therefore would override the encoded defaults.
     * Then check to make sure that if they were set that the
     * values are reasonable.
     */
    read_default();
    if (vers_min_default > vers_max_default ||
        vers_min_default < NFS_VERSMIN ||
        vers_max_default > NFS_VERSMAX) {
        pr_err("%s %s\n%s %s\n",
            gettext("Incorrect configuration of client\'s"),
            NFSADMIN,
            gettext("NFS_CLIENT_VERSMIN or NFS_CLIENT_VERSMAX"),
            gettext("is either out of range or overlaps."));
    }

    SET_ERR_RET(&retry_error, ERR_PROTO_NONE, 0);
    r = mount_nfs(&mnt, ro, &retry_error);
    if (r == RET_RETRY && retries) {
        /*
         * Check the error code from the last mount attempt if it was
         * an RPC error, then retry as is. Otherwise we retry with the
         * nfsretry_vers set. It is set by decrementing nfsvers_to_use.
         * If we are retrying with nfsretry_vers then we don't print any
         * retry messages, since we are not retrying due to an RPC
         * error.
         */
        if (retry_error.error_type) {
            if (retry_error.error_type != ERR_RPCERROR) {
                nfsretry_vers = nfsvers_to_use =
                    nfsvers_to_use - 1;
                if (nfsretry_vers < NFS_VERSMIN)
                    return (r);
            }
        }

        r = retry(&mnt, ro);
    }
    /*
     * exit(r);
     */
    return (r);
}

static void
pr_err(const char *fmt, ...)
{
    va_list ap;

    va_start(ap, fmt);
    if (backgrounded != 0) {
        (void) vsyslog(LOG_ERR, fmt, ap);
    } else {
        (void) fprintf(stderr, "%s: ", typename);
        (void) vfprintf(stderr, fmt, ap);
        (void) fflush(stderr);
    }
    va_end(ap);
}

static void
usage()
{
    (void) fprintf(stderr,
        gettext("Usage: nfs mount [-r] [-o opts] [server:]path dir\n"));
    exit(RET_ERR);
}

static int
mount_nfs(struct mnttab *mntp, int ro, err_ret_t *retry_error)
{
    struct nfs_args *args = NULL, *argp = NULL, *prev_argp = NULL;
    struct netconfig *nconf = NULL;
    struct replica *list = NULL;
    int mntflags = 0;
    int i, r, n;
    int oldvers = 0, vers = 0;
    int last_error = RET_OK;
    int replicated = 0;
    char *p;
    bool_t url;
    bool_t use_pubfh;
    char *special = NULL;
    char *oldpath = NULL;
    char *newpath = NULL;
    char *service;
    pid_t pi;
    struct flock f;
    char *saveopts = NULL;
    char **sl = NULL;

    mntp->mnt_fstype = MNTTYPE_NFS;

    if (ro) {
        mntflags |= MS_RDONLY;
        /* convert "rw"->"ro" */
        if (p = strstr(mntp->mnt_mntopts, "rw")) {
            if (*(p+2) == ',' || *(p+2) == '\0')
                *(p+1) = 'o';
        }
    }

    if (Oflg)
        mntflags |= MS_OVERLAY;

    list = parse_replica(mntp->mnt_special, &n);
    if (list == NULL) {
        if (n < 0)
            pr_err(gettext("nfs file system; use [host:]path\n"));
        else
            pr_err(gettext("no memory\n"));
        return (RET_ERR);
    }

    replicated = (n > 1);

    /*
     * There are some free() calls at the bottom of this loop, so be
     * careful about adding continue statements.
     */
    for (i = 0; i < n; i++) {
        char *path;
        char *host;
        ushort_t port;

        argp = (struct nfs_args *)malloc(sizeof (*argp));
        if (argp == NULL) {
            pr_err(gettext("no memory\n"));
            last_error = RET_ERR;
            goto out;
        }
        memset(argp, 0, sizeof (*argp));

        memset(&nfs_sec, 0, sizeof (nfs_sec));
        sec_opt = 0;
        use_pubfh = FALSE;
        url = FALSE;
        port = 0;
        snego_done = FALSE;

        /*
         * Looking for resources of the form
         *  nfs://server_host[:port_number]/path_name
         */
        if (strcmp(list[i].host, "nfs") == 0 && strncmp(list[i].path,
            "//", 2) == 0) {
            char *sport, *cb;
            url = TRUE;
            oldpath = strdup(list[i].path);
            if (oldpath == NULL) {
                pr_err(gettext("memory allocation failure\n"));
                last_error = RET_ERR;
                goto out;
            }
            host = list[i].path+2;
            path = strchr(host, '/');

            if (path == NULL) {
                pr_err(gettext(
                    "illegal nfs url syntax\n"));
                last_error = RET_ERR;
                goto out;
            }

            *path = '\0';
            if (*host == '[') {
                cb = strchr(host, ']');
                if (cb == NULL) {
                    pr_err(gettext(
                        "illegal nfs url syntax\n"));
                    last_error = RET_ERR;
                    goto out;
                } else {
                    *cb = '\0';
                    host++;
                    cb++;
                    if (*cb == ':')
                        port = htons((ushort_t)
                            atoi(cb+1));
                }
            } else {
                sport = strchr(host, ':');

                if (sport != NULL && sport < path) {
                    *sport = '\0';
                    port = htons((ushort_t)atoi(sport+1));
                }
            }

            path++;
            if (*path == '\0')
                path = ".";

        } else {
            host = list[i].host;
            path = list[i].path;
        }

        if (r = set_args(&mntflags, argp, host, mntp)) {
            last_error = r;
            goto out;
        }

        if (public_opt == TRUE)
            use_pubfh = TRUE;

        if (port == 0) {
            port = nfs_port;
        } else if (nfs_port != 0 && nfs_port != port) {
            pr_err(gettext(
                "port (%u) in nfs URL not the same"
                " as port (%u) in port option\n"),
                (unsigned int)ntohs(port),
                (unsigned int)ntohs(nfs_port));
            last_error = RET_ERR;
            goto out;
        }


        if (replicated && !(mntflags & MS_RDONLY)) {
            pr_err(gettext(
                "replicated mounts must be read-only\n"));
            last_error = RET_ERR;
            goto out;
        }

        if (replicated && (argp->flags & NFSMNT_SOFT)) {
            pr_err(gettext(
                "replicated mounts must not be soft\n"));
            last_error = RET_ERR;
            goto out;
        }

        oldvers = vers;
        nconf = NULL;

        r = RET_ERR;

        /*
         * If -o public was specified, and/or a URL was specified,
         * then try the public file handle method.
         */
        if ((use_pubfh == TRUE) || (url == TRUE)) {
            r = get_fh_via_pub(argp, host, path, url, use_pubfh,
                &vers, &nconf, port);

            if (r != RET_OK) {
                /*
                 * If -o public was specified, then return the
                 * error now.
                 */
                if (use_pubfh == TRUE) {
                    last_error = r;
                    goto out;
                }
            } else
                use_pubfh = TRUE;
            argp->flags |= NFSMNT_PUBLIC;
        }

        if ((r != RET_OK) || (vers == NFS_V4)) {
            bool_t loud_on_mnt_err;

            /*
             * This can happen if -o public is not specified,
             * special is a URL, and server doesn't support
             * public file handle.
             */
            if (url) {
                URLparse(path);
            }

            /*
             * If the path portion of the URL didn't have
             * a leading / then there is good possibility
             * that a mount without a leading slash will
             * fail.
             */
            if (url == TRUE && *path != '/')
                loud_on_mnt_err = FALSE;
            else
                loud_on_mnt_err = TRUE;

            r = get_fh(argp, host, path, &vers,
                loud_on_mnt_err, &nconf, port);

            if (r != RET_OK) {

                /*
                 * If there was no leading / and the path was
                 * derived from a URL, then try again
                 * with a leading /.
                 */
                if ((r == RET_MNTERR) &&
                    (loud_on_mnt_err == FALSE)) {

                    newpath = malloc(strlen(path)+2);

                    if (newpath == NULL) {
                        pr_err(gettext("memory "
                            "allocation failure\n"));
                        last_error = RET_ERR;
                        goto out;
                    }

                    strcpy(newpath, "/");
                    strcat(newpath, path);

                    r = get_fh(argp, host, newpath, &vers,
                        TRUE, &nconf, port);

                    if (r == RET_OK)
                        path = newpath;
                }

                /*
                 * map exit code back to RET_ERR.
                 */
                if (r == RET_MNTERR)
                    r = RET_ERR;

                if (r != RET_OK) {

                    if (replicated) {
                        if (argp->fh)
                            free(argp->fh);
                        if (argp->pathconf)
                            free(argp->pathconf);
                        free(argp);
                        goto cont;
                    }

                    last_error = r;
                    goto out;
                }
            }
        }

        if (oldvers && vers != oldvers) {
            pr_err(
                gettext("replicas must have the same version\n"));
            last_error = RET_ERR;
            goto out;
        }

        /*
         * decide whether to use remote host's
         * lockd or do local locking
         */
        if (!(argp->flags & NFSMNT_LLOCK) && vers == NFS_VERSION &&
            remote_lock(host, argp->fh)) {
            (void) fprintf(stderr, gettext(
                "WARNING: No network locking on %s:%s:"),
                host, path);
            (void) fprintf(stderr, gettext(
                " contact admin to install server change\n"));
                argp->flags |= NFSMNT_LLOCK;
        }

        if (self_check(host))
            argp->flags |= NFSMNT_LOOPBACK;

        if (use_pubfh == FALSE) {
            /*
             * Call to get_fh() above may have obtained the
             * netconfig info and NULL proc'd the server.
             * This would be the case with v4
             */
            if (!(argp->flags & NFSMNT_KNCONF)) {
                nconf = NULL;
                if (r = getaddr_nfs(argp, host, &nconf,
                    FALSE, path, port, retry_error,
                    TRUE)) {
                        last_error = r;
                        goto out;
                }
            }
        }

        if (make_secure(argp, host, nconf, use_pubfh, vers) < 0) {
            last_error = RET_ERR;
            goto out;
        }

        if ((url == TRUE) && (use_pubfh == FALSE)) {
            /*
             * Convert the special from
             *  nfs://host/path
             * to
             *  host:path
             */
            if (convert_special(&special, host, oldpath, path,
                mntp->mnt_special) == -1) {
                (void) fprintf(stderr, gettext(
                    "could not convert URL nfs:%s to %s:%s\n"),
                    oldpath, host, path);
                last_error = RET_ERR;
                goto out;
            } else {
                mntp->mnt_special = special;
            }
        }

        if (prev_argp == NULL)
            args = argp;
        else
            prev_argp->nfs_ext_u.nfs_extB.next = argp;
        prev_argp = argp;

cont:
        if (oldpath != NULL) {
            free(oldpath);
            oldpath = NULL;
        }

        if (newpath != NULL) {
            free(newpath);
            newpath = NULL;
        }
    }

    argp = NULL;

    if (args == NULL) {
        last_error = RET_RETRY;
        goto out;
    }

    /* Determine which services are appropriate for the NFS version */
    if (strcmp(fstype, MNTTYPE_NFS4) == 0)
        sl = service_list_v4;
    else
        sl = service_list;

    /*
     * enable services as needed.
     */
    _check_services(sl);

    mntflags |= MS_DATA | MS_OPTIONSTR;

    if (mflg)
        mntflags |= MS_NOMNTTAB;

    if (!qflg)
        saveopts = strdup(mntp->mnt_mntopts);

    if (mount(mntp->mnt_special, mntp->mnt_mountp, mntflags, fstype, args,
        sizeof (*args), mntp->mnt_mntopts, MAX_MNTOPT_STR) < 0) {
        if (errno != ENOENT) {
            pr_err(gettext("mount: %s: %s\n"),
                mntp->mnt_mountp, strerror(errno));
        } else {
            struct stat sb;
            if (stat(mntp->mnt_mountp, &sb) < 0 && errno == ENOENT)
                pr_err(gettext("mount: %s: %s\n"),
                    mntp->mnt_mountp, strerror(ENOENT));
            else
                pr_err("%s: %s\n", mntp->mnt_special,
                    strerror(ENOENT));
        }

        last_error = RET_ERR;
        goto out;
    }

    if (!qflg && saveopts != NULL) {
        cmp_requested_to_actual_options(saveopts, mntp->mnt_mntopts,
            mntp->mnt_special, mntp->mnt_mountp);
    }

out:
    if (saveopts != NULL)
        free(saveopts);
    if (special != NULL)
        free(special);
    if (oldpath != NULL)
        free(oldpath);
    if (newpath != NULL)
        free(newpath);

    free_replica(list, n);

    if (argp != NULL) {
        /*
         * If we had a new entry which was not added to the
         * list yet, then add it now that it can be freed.
         */
        if (prev_argp == NULL)
            args = argp;
        else
            prev_argp->nfs_ext_u.nfs_extB.next = argp;
    }
    argp = args;
    while (argp != NULL) {
        if (argp->fh)
            free(argp->fh);
        if (argp->pathconf)
            free(argp->pathconf);
        if (argp->knconf)
            free(argp->knconf);
        if (argp->addr) {
            free(argp->addr->buf);
            free(argp->addr);
        }
        nfs_free_secdata(argp->nfs_ext_u.nfs_extB.secdata);
        if (argp->syncaddr) {
            free(argp->syncaddr->buf);
            free(argp->syncaddr);
        }
        if (argp->netname)
            free(argp->netname);
        prev_argp = argp;
        argp = argp->nfs_ext_u.nfs_extB.next;
        free(prev_argp);
    }

    return (last_error);
}

/*
 * These options are duplicated in uts/common/fs/nfs/nfs_dlinet.c
 * Changes must be made to both lists.
 */
static char *optlist[] = {
#define OPT_RO      0
    MNTOPT_RO,
#define OPT_RW      1
    MNTOPT_RW,
#define OPT_QUOTA   2
    MNTOPT_QUOTA,
#define OPT_NOQUOTA 3
    MNTOPT_NOQUOTA,
#define OPT_SOFT    4
    MNTOPT_SOFT,
#define OPT_HARD    5
    MNTOPT_HARD,
#define OPT_SUID    6
    MNTOPT_SUID,
#define OPT_NOSUID  7
    MNTOPT_NOSUID,
#define OPT_GRPID   8
    MNTOPT_GRPID,
#define OPT_REMOUNT 9
    MNTOPT_REMOUNT,
#define OPT_NOSUB   10
    MNTOPT_NOSUB,
#define OPT_INTR    11
    MNTOPT_INTR,
#define OPT_NOINTR  12
    MNTOPT_NOINTR,
#define OPT_PORT    13
    MNTOPT_PORT,
#define OPT_SECURE  14
    MNTOPT_SECURE,
#define OPT_RSIZE   15
    MNTOPT_RSIZE,
#define OPT_WSIZE   16
    MNTOPT_WSIZE,
#define OPT_TIMEO   17
    MNTOPT_TIMEO,
#define OPT_RETRANS 18
    MNTOPT_RETRANS,
#define OPT_ACTIMEO 19
    MNTOPT_ACTIMEO,
#define OPT_ACREGMIN    20
    MNTOPT_ACREGMIN,
#define OPT_ACREGMAX    21
    MNTOPT_ACREGMAX,
#define OPT_ACDIRMIN    22
    MNTOPT_ACDIRMIN,
#define OPT_ACDIRMAX    23
    MNTOPT_ACDIRMAX,
#define OPT_BG      24
    MNTOPT_BG,
#define OPT_FG      25
    MNTOPT_FG,
#define OPT_RETRY   26
    MNTOPT_RETRY,
#define OPT_NOAC    27
    MNTOPT_NOAC,
#define OPT_NOCTO   28
    MNTOPT_NOCTO,
#define OPT_LLOCK   29
    MNTOPT_LLOCK,
#define OPT_POSIX   30
    MNTOPT_POSIX,
#define OPT_VERS    31
    MNTOPT_VERS,
#define OPT_PROTO   32
    MNTOPT_PROTO,
#define OPT_SEMISOFT    33
    MNTOPT_SEMISOFT,
#define OPT_NOPRINT 34
    MNTOPT_NOPRINT,
#define OPT_SEC     35
    MNTOPT_SEC,
#define OPT_LARGEFILES  36
    MNTOPT_LARGEFILES,
#define OPT_NOLARGEFILES 37
    MNTOPT_NOLARGEFILES,
#define OPT_PUBLIC  38
    MNTOPT_PUBLIC,
#define OPT_DIRECTIO    39
    MNTOPT_FORCEDIRECTIO,
#define OPT_NODIRECTIO  40
    MNTOPT_NOFORCEDIRECTIO,
#define OPT_XATTR   41
    MNTOPT_XATTR,
#define OPT_NOXATTR 42
    MNTOPT_NOXATTR,
#define OPT_DEVICES 43
    MNTOPT_DEVICES,
#define OPT_NODEVICES   44
    MNTOPT_NODEVICES,
#define OPT_SETUID  45
    MNTOPT_SETUID,
#define OPT_NOSETUID    46
    MNTOPT_NOSETUID,
#define OPT_EXEC    47
    MNTOPT_EXEC,
#define OPT_NOEXEC  48
    MNTOPT_NOEXEC,
    NULL
};

#define bad(val) (val == NULL || !isdigit(*val))

static int
set_args(int *mntflags, struct nfs_args *args, char *fshost, struct mnttab *mnt)
{
    char *saveopt, *optstr, *opts, *newopts, *val;
    int largefiles = 0;
    int invalid = 0;
    int attrpref = 0;
    int optlen;

    args->flags = NFSMNT_INT;   /* default is "intr" */
    args->flags |= NFSMNT_HOSTNAME;
    args->flags |= NFSMNT_NEWARGS;  /* using extented nfs_args structure */
    args->hostname = fshost;

    optstr = opts = strdup(mnt->mnt_mntopts);
    /* sizeof (MNTOPT_XXX) includes one extra byte we may need for "," */
    optlen = strlen(mnt->mnt_mntopts) + sizeof (MNTOPT_XATTR) + 1;
    if (optlen > MAX_MNTOPT_STR) {
        pr_err(gettext("option string too long"));
        return (RET_ERR);
    }
    newopts = malloc(optlen);
    if (opts == NULL || newopts == NULL) {
        pr_err(gettext("no memory"));
        if (opts)
            free(opts);
        if (newopts)
            free(newopts);
        return (RET_ERR);
    }
    newopts[0] = '\0';

    while (*opts) {
        invalid = 0;
        saveopt = opts;
        switch (getsubopt(&opts, optlist, &val)) {
        case OPT_RO:
            *mntflags |= MS_RDONLY;
            break;
        case OPT_RW:
            *mntflags &= ~(MS_RDONLY);
            break;
        case OPT_QUOTA:
        case OPT_NOQUOTA:
            break;
        case OPT_SOFT:
            args->flags |= NFSMNT_SOFT;
            args->flags &= ~(NFSMNT_SEMISOFT);
            break;
        case OPT_SEMISOFT:
            args->flags |= NFSMNT_SOFT;
            args->flags |= NFSMNT_SEMISOFT;
            break;
        case OPT_HARD:
            args->flags &= ~(NFSMNT_SOFT);
            args->flags &= ~(NFSMNT_SEMISOFT);
            break;
        case OPT_SUID:
            *mntflags &= ~(MS_NOSUID);
            break;
        case OPT_NOSUID:
            *mntflags |= MS_NOSUID;
            break;
        case OPT_GRPID:
            args->flags |= NFSMNT_GRPID;
            break;
        case OPT_REMOUNT:
            *mntflags |= MS_REMOUNT;
            break;
        case OPT_INTR:
            args->flags |= NFSMNT_INT;
            break;
        case OPT_NOINTR:
            args->flags &= ~(NFSMNT_INT);
            break;
        case OPT_NOAC:
            args->flags |= NFSMNT_NOAC;
            break;
        case OPT_PORT:
            if (bad(val))
                goto badopt;
            nfs_port = htons((ushort_t)atoi(val));
            break;

        case OPT_SECURE:
            if (nfs_getseconfig_byname("dh", &nfs_sec)) {
                pr_err(gettext("can not get \"dh\" from %s\n"),
                        NFSSEC_CONF);
                goto badopt;
            }
            sec_opt++;
            break;

        case OPT_NOCTO:
            args->flags |= NFSMNT_NOCTO;
            break;

        case OPT_RSIZE:
            args->flags |= NFSMNT_RSIZE;
            if (bad(val))
                goto badopt;
            args->rsize = atoi(val);
            break;
        case OPT_WSIZE:
            args->flags |= NFSMNT_WSIZE;
            if (bad(val))
                goto badopt;
            args->wsize = atoi(val);
            break;
        case OPT_TIMEO:
            args->flags |= NFSMNT_TIMEO;
            if (bad(val))
                goto badopt;
            args->timeo = atoi(val);
            break;
        case OPT_RETRANS:
            args->flags |= NFSMNT_RETRANS;
            if (bad(val))
                goto badopt;
            args->retrans = atoi(val);
            break;
        case OPT_ACTIMEO:
            args->flags |= NFSMNT_ACDIRMAX;
            args->flags |= NFSMNT_ACREGMAX;
            args->flags |= NFSMNT_ACDIRMIN;
            args->flags |= NFSMNT_ACREGMIN;
            if (bad(val))
                goto badopt;
            args->acdirmin = args->acregmin = args->acdirmax
                = args->acregmax = atoi(val);
            break;
        case OPT_ACREGMIN:
            args->flags |= NFSMNT_ACREGMIN;
            if (bad(val))
                goto badopt;
            args->acregmin = atoi(val);
            break;
        case OPT_ACREGMAX:
            args->flags |= NFSMNT_ACREGMAX;
            if (bad(val))
                goto badopt;
            args->acregmax = atoi(val);
            break;
        case OPT_ACDIRMIN:
            args->flags |= NFSMNT_ACDIRMIN;
            if (bad(val))
                goto badopt;
            args->acdirmin = atoi(val);
            break;
        case OPT_ACDIRMAX:
            args->flags |= NFSMNT_ACDIRMAX;
            if (bad(val))
                goto badopt;
            args->acdirmax = atoi(val);
            break;
        case OPT_BG:
            bg++;
            break;
        case OPT_FG:
            bg = 0;
            break;
        case OPT_RETRY:
            if (bad(val))
                goto badopt;
            retries = atoi(val);
            break;
        case OPT_LLOCK:
            args->flags |= NFSMNT_LLOCK;
            break;
        case OPT_POSIX:
            posix = 1;
            break;
        case OPT_VERS:
            if (bad(val))
                goto badopt;
            nfsvers = (rpcvers_t)atoi(val);
            break;
        case OPT_PROTO:
            if (val == NULL)
                goto badopt;

            nfs_proto = (char *)malloc(strlen(val)+1);
            if (!nfs_proto) {
                pr_err(gettext("no memory"));
                return (RET_ERR);
            }

            (void) strncpy(nfs_proto, val, strlen(val)+1);
            break;
        case OPT_NOPRINT:
            args->flags |= NFSMNT_NOPRINT;
            break;
        case OPT_LARGEFILES:
            largefiles = 1;
            break;
        case OPT_NOLARGEFILES:
            pr_err(gettext("NFS can't support \"nolargefiles\"\n"));
            free(optstr);
            return (RET_ERR);

        case OPT_SEC:
            if (nfs_getseconfig_byname(val, &nfs_sec)) {
                pr_err(gettext("can not get \"%s\" from %s\n"),
                        val, NFSSEC_CONF);
                return (RET_ERR);
            }
            sec_opt++;
            break;

        case OPT_PUBLIC:
            public_opt = TRUE;
            break;

        case OPT_DIRECTIO:
            args->flags |= NFSMNT_DIRECTIO;
            break;

        case OPT_NODIRECTIO:
            args->flags &= ~(NFSMNT_DIRECTIO);
            break;

        case OPT_XATTR:
        case OPT_NOXATTR:
            /*
             * VFS options; just need to get them into the
             * new mount option string and note we've seen them
             */
            attrpref = 1;
            break;
        default:
            /*
             * Note that this could be a valid OPT_* option so
             * we can't use "val" but need to use "saveopt".
             */
            if (fsisstdopt(saveopt))
                break;
            invalid = 1;
            if (!qflg)
                (void) fprintf(stderr, gettext(
                    "mount: %s on %s - WARNING unknown option"
                    " \"%s\"\n"), mnt->mnt_special,
                    mnt->mnt_mountp, saveopt);
            break;
        }
        if (!invalid) {
            if (newopts[0])
                strcat(newopts, ",");
            strcat(newopts, saveopt);
        }
    }
    /* Default is to turn extended attrs on */
    if (!attrpref) {
        if (newopts[0])
            strcat(newopts, ",");
        strcat(newopts, MNTOPT_XATTR);
    }
    strcpy(mnt->mnt_mntopts, newopts);
    free(newopts);
    free(optstr);

    /* ensure that only one secure mode is requested */
    if (sec_opt > 1) {
        pr_err(gettext("Security options conflict\n"));
        return (RET_ERR);
    }

    /* ensure that the user isn't trying to get large files over V2 */
    if (nfsvers == NFS_VERSION && largefiles) {
        pr_err(gettext("NFS V2 can't support \"largefiles\"\n"));
        return (RET_ERR);
    }

    if (nfsvers == NFS_V4 &&
        nfs_proto != NULL &&
        strncasecmp(nfs_proto, NC_UDP, strlen(NC_UDP)) == 0) {
        pr_err(gettext("NFS V4 does not support %s\n"), nfs_proto);
        return (RET_ERR);
    }

    return (RET_OK);

badopt:
    pr_err(gettext("invalid option: \"%s\"\n"), saveopt);
    free(optstr);
    return (RET_ERR);
}

static int
make_secure(struct nfs_args *args, char *hostname, struct netconfig *nconf,
    bool_t use_pubfh, rpcvers_t vers)
{
    sec_data_t *secdata;
    int flags;
    struct netbuf *syncaddr = NULL;
    struct nd_addrlist *retaddrs = NULL;
    char netname[MAXNETNAMELEN+1];

    /*
     * check to see if any secure mode is requested.
     * if not, use default security mode.
     */
    if (!snego_done && !sec_opt) {
        /*
         *  Get default security mode.
         *  AUTH_UNIX has been the default choice for a long time.
         *  The better NFS security service becomes, the better chance
         *  we will set stronger security service as the default NFS
         *  security mode.
         *
         */
        if (nfs_getseconfig_default(&nfs_sec)) {
        pr_err(gettext("error getting default security entry\n"));
        return (-1);
        }
        args->flags |= NFSMNT_SECDEFAULT;
    }

    /*
     * Get the network address for the time service on the server.
     * If an RPC based time service is not available then try the
     * IP time service.
     *
     * This is for AUTH_DH processing. We will also pass down syncaddr
     * and netname for NFS V4 even if AUTH_DH is not requested right now.
     * NFS V4 does security negotiation in the kernel via SECINFO.
     * These information might be needed later in the kernel.
     *
     * Eventurally, we want to move this code to nfs_clnt_secdata()
     * when autod_nfs.c and mount.c can share the same get_the_addr()
     * routine.
     */
    flags = 0;
    syncaddr = NULL;

    if (nfs_sec.sc_rpcnum == AUTH_DH || vers == NFS_V4) {
        /*
         * If using the public fh or nfsv4, we will not contact the
         * remote RPCBINDer, since it is possibly behind a firewall.
         */
        if (use_pubfh == FALSE && vers != NFS_V4) {
            syncaddr = get_the_addr(hostname, RPCBPROG, RPCBVERS,
                nconf, 0, NULL, NULL, FALSE, NULL, NULL);
        }

        if (syncaddr != NULL) {
            /* for flags in sec_data */
            flags |= AUTH_F_RPCTIMESYNC;
        } else {
            struct nd_hostserv hs;
            int error;

            hs.h_host = hostname;
            hs.h_serv = "timserver";

            error = netdir_getbyname(nconf, &hs, &retaddrs);

            if (error != ND_OK && (nfs_sec.sc_rpcnum == AUTH_DH)) {
                pr_err(gettext("%s: secure: no time service\n"),
                        hostname);
                return (-1);
            }

            if (error == ND_OK)
                syncaddr = retaddrs->n_addrs;

            /*
             * For NFS_V4 if AUTH_DH is negotiated later in the
             * kernel thru SECINFO, it will need syncaddr
             * and netname data.
             */
            if (vers == NFS_V4 && syncaddr &&
                    host2netname(netname, hostname, NULL)) {
                args->syncaddr = malloc(sizeof (struct netbuf));
                args->syncaddr->buf = malloc(syncaddr->len);
                (void) memcpy(args->syncaddr->buf, syncaddr->buf,
                            syncaddr->len);
                args->syncaddr->len = syncaddr->len;
                args->syncaddr->maxlen = syncaddr->maxlen;
                args->netname = strdup(netname);
                args->flags |= NFSMNT_SECURE;
            }
        }
    }

    /*
     * For the initial chosen flavor (any flavor defined in nfssec.conf),
     * the data will be stored in the sec_data structure via
     * nfs_clnt_secdata() and be passed to the kernel via nfs_args_*
     * extended data structure.
     */
    if (!(secdata = nfs_clnt_secdata(&nfs_sec, hostname, args->knconf,
                    syncaddr, flags))) {
        pr_err(gettext("errors constructing security related data\n"));
        if (flags & AUTH_F_RPCTIMESYNC) {
            free(syncaddr->buf);
            free(syncaddr);
        } else if (retaddrs)
            netdir_free((void *)retaddrs, ND_ADDRLIST);
        return (-1);
    }

    NFS_ARGS_EXTB_secdata(args, secdata);
    if (flags & AUTH_F_RPCTIMESYNC) {
        free(syncaddr->buf);
        free(syncaddr);
    } else if (retaddrs)
        netdir_free((void *)retaddrs, ND_ADDRLIST);
    return (0);
}

/*
 * Get the network address on "hostname" for program "prog"
 * with version "vers" by using the nconf configuration data
 * passed in.
 *
 * If the address of a netconfig pointer is null then
 * information is not sufficient and no netbuf will be returned.
 *
 * Finally, ping the null procedure of that service.
 *
 * A similar routine is also defined in ../../autofs/autod_nfs.c.
 * This is a potential routine to move to ../lib for common usage.
 */
static struct netbuf *
get_the_addr(char *hostname, ulong_t prog, ulong_t vers,
    struct netconfig *nconf, ushort_t port, struct t_info *tinfo,
    caddr_t *fhp, bool_t get_pubfh, char *fspath, err_ret_t *error)
{
    struct netbuf *nb = NULL;
    struct t_bind *tbind = NULL;
    CLIENT *cl = NULL;
    struct timeval tv;
    int fd = -1;
    AUTH *ah = NULL;
    AUTH *new_ah = NULL;
    struct snego_t snego;

    if (nconf == NULL)
        return (NULL);

    if ((fd = t_open(nconf->nc_device, O_RDWR, tinfo)) == -1)
            goto done;

    /* LINTED pointer alignment */
    if ((tbind = (struct t_bind *)t_alloc(fd, T_BIND, T_ADDR))
        == NULL)
        goto done;

    /*
     * In the case of public filehandle usage or NFSv4 we want to
     * avoid use of the rpcbind/portmap protocol
     */
    if ((get_pubfh == TRUE) || (vers == NFS_V4)) {
        struct nd_hostserv hs;
        struct nd_addrlist *retaddrs;
        int retval;
        hs.h_host = hostname;

        /* NFS where vers==4 does not support UDP */
        if (vers == NFS_V4 &&
            strncasecmp(nconf->nc_proto, NC_UDP,
                strlen(NC_UDP)) == 0) {
            SET_ERR_RET(error, ERR_PROTO_UNSUPP, 0);
            goto done;
        }

        if (port == 0)
            hs.h_serv = "nfs";
        else
            hs.h_serv = NULL;

        if ((retval = netdir_getbyname(nconf, &hs, &retaddrs))
            != ND_OK) {
            /*
             * Carefully set the error value here. Want to signify
             * that the error was an unknown host.
             */
            if (retval == ND_NOHOST) {
                SET_ERR_RET(error, ERR_NOHOST, retval);
            }

            goto done;
        }
        memcpy(tbind->addr.buf, retaddrs->n_addrs->buf,
            retaddrs->n_addrs->len);
        tbind->addr.len = retaddrs->n_addrs->len;
        netdir_free((void *)retaddrs, ND_ADDRLIST);
        (void) netdir_options(nconf, ND_SET_RESERVEDPORT, fd, NULL);

    } else {
        if (rpcb_getaddr(prog, vers, nconf, &tbind->addr,
            hostname) == FALSE) {
            goto done;
        }
    }

    if (port) {
        /* LINTED pointer alignment */
        if (strcmp(nconf->nc_protofmly, NC_INET) == 0)
            ((struct sockaddr_in *)tbind->addr.buf)->sin_port
                = port;
        else if (strcmp(nconf->nc_protofmly, NC_INET6) == 0)
            ((struct sockaddr_in6 *)tbind->addr.buf)->sin6_port
                = port;

    }

    cl = clnt_tli_create(fd, nconf, &tbind->addr, prog, vers, 0, 0);
    if (cl == NULL) {
        /*
         * clnt_tli_create() returns either RPC_SYSTEMERROR,
         * RPC_UNKNOWNPROTO or RPC_TLIERROR. The RPC_TLIERROR translates
         * to "Misc. TLI error". This is not too helpful. Most likely
         * the connection to the remote server timed out, so this
         * error is at least less perplexing.
         * See: usr/src/cmd/rpcinfo/rpcinfo.c
         */
        if (rpc_createerr.cf_stat == RPC_TLIERROR) {
            SET_ERR_RET(error, ERR_RPCERROR, RPC_PMAPFAILURE);
        } else {
            SET_ERR_RET(error, ERR_RPCERROR, rpc_createerr.cf_stat);
        }
        goto done;
    }

    ah = authsys_create_default();
    if (ah != NULL)
        cl->cl_auth = ah;

    tv.tv_sec = 5;
    tv.tv_usec = 0;

    (void) clnt_control(cl, CLSET_TIMEOUT, (char *)&tv);

    if ((get_pubfh == TRUE) && (vers != NFS_V4)) {
        enum snego_stat sec;

        if (!snego_done) {
        /*
         * negotiate sec flavor.
         */
        snego.cnt = 0;
        if ((sec = nfs_sec_nego(vers, cl, fspath, &snego)) ==
            SNEGO_SUCCESS) {
            int jj;

        /*
         * check if server supports the one
         * specified in the sec= option.
         */
            if (sec_opt) {
            for (jj = 0; jj < snego.cnt; jj++) {
                if (snego.array[jj] == nfs_sec.sc_nfsnum) {
                snego_done = TRUE;
                break;
                }
            }
            }

        /*
         * find a common sec flavor
         */
            if (!snego_done) {
            if (sec_opt) {
                pr_err(gettext(
                "Server does not support the security"
                " flavor specified.\n"));
            }
            for (jj = 0; jj < snego.cnt; jj++) {
                if (!nfs_getseconfig_bynumber(snego.array[jj],
                &nfs_sec)) {
                snego_done = TRUE;
                if (sec_opt) {
                    pr_err(gettext(
                    "Security flavor %d was negotiated and"
                    " will be used.\n"),
                    nfs_sec.sc_nfsnum);
                }
                break;
                }
            }
            }
            if (!snego_done)
            return (NULL);

        /*
         * Now that the flavor has been
         * negotiated, get the fh.
         *
         * First, create an auth handle using the negotiated
         * sec flavor in the next lookup to
         * fetch the filehandle.
         */
            new_ah = nfs_create_ah(cl, hostname, &nfs_sec);
            if (new_ah == NULL)
            goto done;
            cl->cl_auth = new_ah;
        } else if (sec == SNEGO_ARRAY_TOO_SMALL || sec ==
            SNEGO_FAILURE) {
            goto done;
        }
        /*
         * Note that if sec == SNEGO_DEF_VALID
         * default sec flavor is acceptable.
         * Use it to get the filehandle.
         */
        }

        if (vers == NFS_VERSION) {
        wnl_diropargs arg;
        wnl_diropres *res;

        memset((char *)&arg.dir, 0, sizeof (wnl_fh));
        arg.name = fspath;
        res = wnlproc_lookup_2(&arg, cl);

        if (res == NULL || res->status != NFS_OK)
            goto done;
        *fhp = malloc(sizeof (wnl_fh));

        if (*fhp == NULL) {
            pr_err(gettext("no memory\n"));
            goto done;
        }

        memcpy((char *)*fhp,
            (char *)&res->wnl_diropres_u.wnl_diropres.file,
            sizeof (wnl_fh));
        } else {
        WNL_LOOKUP3args arg;
        WNL_LOOKUP3res *res;
        nfs_fh3 *fh3p;

        memset((char *)&arg.what.dir, 0, sizeof (wnl_fh3));
        arg.what.name = fspath;
        res = wnlproc3_lookup_3(&arg, cl);

        if (res == NULL || res->status != NFS3_OK)
            goto done;

        fh3p = (nfs_fh3 *)malloc(sizeof (*fh3p));

        if (fh3p == NULL) {
            pr_err(gettext("no memory\n"));
            CLNT_FREERES(cl, xdr_WNL_LOOKUP3res, (char *)res);
            goto done;
        }

        fh3p->fh3_length =
            res->WNL_LOOKUP3res_u.res_ok.object.data.data_len;
        memcpy(fh3p->fh3_u.data,
            res->WNL_LOOKUP3res_u.res_ok.object.data.data_val,
            fh3p->fh3_length);

        *fhp = (caddr_t)fh3p;

        CLNT_FREERES(cl, xdr_WNL_LOOKUP3res, (char *)res);
        }
    } else {
        void *res;
        struct rpc_err r_err;

        if (vers == NFS_VERSION)
            res = wnlproc_null_2(NULL, cl);
        else if (vers == NFS_V3)
            res = wnlproc3_null_3(NULL, cl);
        else
            res = wnlproc4_null_4(NULL, cl);

        if (res == NULL) {
            clnt_geterr(cl, &r_err);
            if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
                switch (r_err.re_status) {
                case RPC_TLIERROR:
                case RPC_CANTRECV:
                case RPC_CANTSEND:
                    r_err.re_status = RPC_PROGVERSMISMATCH;
                }
            }
            SET_ERR_RET(error, ERR_RPCERROR, r_err.re_status);
            goto done;
        }
    }

    /*
     * Make a copy of the netbuf to return
     */
    nb = (struct netbuf *)malloc(sizeof (*nb));
    if (nb == NULL) {
        pr_err(gettext("no memory\n"));
        goto done;
    }
    *nb = tbind->addr;
    nb->buf = (char *)malloc(nb->maxlen);
    if (nb->buf == NULL) {
        pr_err(gettext("no memory\n"));
        free(nb);
        nb = NULL;
        goto done;
    }
    (void) memcpy(nb->buf, tbind->addr.buf, tbind->addr.len);

done:
    if (cl) {
        if (ah != NULL) {
        if (new_ah != NULL)
            AUTH_DESTROY(ah);
        AUTH_DESTROY(cl->cl_auth);
        cl->cl_auth = NULL;
        }
        clnt_destroy(cl);
        cl = NULL;
    }
    if (tbind) {
        t_free((char *)tbind, T_BIND);
        tbind = NULL;
    }
    if (fd >= 0)
        (void) t_close(fd);
    return (nb);
}

/*
 * Get a network address on "hostname" for program "prog"
 * with version "vers".  If the port number is specified (non zero)
 * then try for a TCP/UDP transport and set the port number of the
 * resulting IP address.
 *
 * If the address of a netconfig pointer was passed and
 * if it's not null, use it as the netconfig otherwise
 * assign the address of the netconfig that was used to
 * establish contact with the service.
 *
 * A similar routine is also defined in ../../autofs/autod_nfs.c.
 * This is a potential routine to move to ../lib for common usage.
 *
 * "error" refers to a more descriptive term when get_addr fails
 * and returns NULL: ERR_PROTO_NONE if no error introduced by
 * -o proto option, ERR_NETPATH if error found in NETPATH
 * environment variable, ERR_PROTO_INVALID if an unrecognized
 * protocol is specified by user, and ERR_PROTO_UNSUPP for a
 * recognized but invalid protocol (eg. ticlts, ticots, etc.).
 * "error" is ignored if get_addr returns non-NULL result.
 *
 */
static struct netbuf *
get_addr(char *hostname, ulong_t prog, ulong_t vers, struct netconfig **nconfp,
    char *proto, ushort_t port, struct t_info *tinfo, caddr_t *fhp,
    bool_t get_pubfh, char *fspath, err_ret_t *error)
{
    struct netbuf *nb = NULL;
    struct netconfig *nconf = NULL;
    NCONF_HANDLE *nc = NULL;
    int nthtry = FIRST_TRY;
    err_ret_t errsave_nohost, errsave_rpcerr;

    SET_ERR_RET(&errsave_nohost, ERR_PROTO_NONE, 0);
    SET_ERR_RET(&errsave_rpcerr, ERR_PROTO_NONE, 0);

    SET_ERR_RET(error, ERR_PROTO_NONE, 0);

    if (nconfp && *nconfp)
        return (get_the_addr(hostname, prog, vers, *nconfp, port,
            tinfo, fhp, get_pubfh, fspath, error));
    /*
     * No nconf passed in.
     *
     * Try to get a nconf from /etc/netconfig filtered by
     * the NETPATH environment variable.
     * First search for COTS, second for CLTS unless proto
     * is specified.  When we retry, we reset the
     * netconfig list so that we would search the whole list
     * all over again.
     */

    if ((nc = setnetpath()) == NULL) {
        /* should only return an error if problems with NETPATH */
        /* In which case you are hosed */
        SET_ERR_RET(error, ERR_NETPATH, 0);
        goto done;
    }

    /*
     * If proto is specified, then only search for the match,
     * otherwise try COTS first, if failed, try CLTS.
     */
    if (proto) {
        /* no matching proto name */
        SET_ERR_RET(error, ERR_PROTO_INVALID, 0);

        while (nconf = getnetpath(nc)) {
            if (strcmp(nconf->nc_netid, proto))
                continue;

            /* may be unsupported */
            SET_ERR_RET(error, ERR_PROTO_UNSUPP, 0);

            if ((port != 0) &&
                ((strcmp(nconf->nc_protofmly, NC_INET) == 0 ||
                strcmp(nconf->nc_protofmly, NC_INET6) == 0) &&
                (strcmp(nconf->nc_proto, NC_TCP) != 0 &&
                strcmp(nconf->nc_proto, NC_UDP) != 0)))

                continue;

            else {
                nb = get_the_addr(hostname, prog,
                    vers, nconf, port, tinfo,
                        fhp, get_pubfh, fspath, error);

                if (nb != NULL)
                    break;

                /* nb is NULL - deal with errors */
                if (error) {
                    if (error->error_type == ERR_NOHOST)
                        SET_ERR_RET(&errsave_nohost,
                            error->error_type,
                            error->error_value);
                    if (error->error_type == ERR_RPCERROR)
                        SET_ERR_RET(&errsave_rpcerr,
                            error->error_type,
                            error->error_value);
                }
                /*
                 * continue with same protocol
                 * selection
                 */
                continue;
            }
        } /* end of while */

        if (nconf == NULL)
            goto done;

        if ((nb = get_the_addr(hostname, prog, vers, nconf, port,
                tinfo, fhp, get_pubfh, fspath, error)) == NULL)
            goto done;


    } else {
retry:
        SET_ERR_RET(error, ERR_NETPATH, 0);
        while (nconf = getnetpath(nc)) {
            SET_ERR_RET(error, ERR_PROTO_NONE, 0);
            if (nconf->nc_flag & NC_VISIBLE) {
                if (nthtry == FIRST_TRY) {
                    if ((nconf->nc_semantics ==
                        NC_TPI_COTS_ORD) ||
                        (nconf->nc_semantics ==
                        NC_TPI_COTS)) {

                        if (port == 0)
                            break;

                        if ((strcmp(nconf->nc_protofmly,
                            NC_INET) == 0 ||
                            strcmp(nconf->
                            nc_protofmly,
                            NC_INET6) == 0) &&
                            (strcmp(nconf->nc_proto,
                            NC_TCP) == 0))

                            break;
                    }
                }
                if (nthtry == SECOND_TRY) {
                    if (nconf->nc_semantics ==
                        NC_TPI_CLTS) {
                        if (port == 0)
                            break;
                        if ((strcmp(nconf->nc_protofmly,
                            NC_INET) == 0 ||
                            strcmp(nconf->
                            nc_protofmly, NC_INET6)
                            == 0) &&
                            (strcmp(
                            nconf->nc_proto,
                            NC_UDP) == 0))
                            break;
                    }
                }
            }
        } /* while */
        if (nconf == NULL) {
            if (++nthtry <= MNT_PREF_LISTLEN) {
                endnetpath(nc);
                if ((nc = setnetpath()) == NULL)
                    goto done;
                goto retry;
            } else
                goto done;
        } else {
            if ((nb = get_the_addr(hostname, prog, vers, nconf,
                port, tinfo, fhp, get_pubfh, fspath, error))
                == NULL) {
                /* nb is NULL - deal with errors */
                if (error) {
                    if (error->error_type == ERR_NOHOST)
                        SET_ERR_RET(&errsave_nohost,
                            error->error_type,
                            error->error_value);
                    if (error->error_type == ERR_RPCERROR)
                        SET_ERR_RET(&errsave_rpcerr,
                            error->error_type,
                            error->error_value);
                }
                /*
                 * Continue the same search path in the
                 * netconfig db until no more matched
                 * nconf (nconf == NULL).
                 */
                goto retry;
            }
        }
    }
    SET_ERR_RET(error, ERR_PROTO_NONE, 0);

    /*
     * Got nconf and nb.  Now dup the netconfig structure (nconf)
     * and return it thru nconfp.
     */
    *nconfp = getnetconfigent(nconf->nc_netid);
    if (*nconfp == NULL) {
        syslog(LOG_ERR, "no memory\n");
        free(nb);
        nb = NULL;
    }
done:
    if (nc)
        endnetpath(nc);

    if (nb == NULL) {
        /*
         * Check the saved errors. The RPC error has *
         * precedence over the no host error.
         */
        if (errsave_nohost.error_type != ERR_PROTO_NONE)
            SET_ERR_RET(error, errsave_nohost.error_type,
                    errsave_nohost.error_value);

        if (errsave_rpcerr.error_type != ERR_PROTO_NONE)
            SET_ERR_RET(error, errsave_rpcerr.error_type,
                    errsave_rpcerr.error_value);
    }

    return (nb);
}

/*
 * Get a file handle usinging multi-component lookup with the public
 * file handle.
 */
static int
get_fh_via_pub(struct nfs_args *args, char *fshost, char *fspath, bool_t url,
    bool_t loud, int *versp, struct netconfig **nconfp, ushort_t port)
{
    uint_t vers_min;
    uint_t vers_max;
    int r;
    char *path;

    if (nfsvers != 0) {
        vers_max = vers_min = nfsvers;
    } else {
        vers_max = vers_max_default;
        vers_min = vers_min_default;
    }

    if (url == FALSE) {
        path = malloc(strlen(fspath) + 2);
        if (path == NULL) {
            if (loud == TRUE)  {
                pr_err(gettext("no memory\n"));
            }
            return (RET_ERR);
        }

        path[0] = (char)WNL_NATIVEPATH;
        (void) strcpy(&path[1], fspath);

    } else  {
        path = fspath;
    }

    for (nfsvers_to_use = vers_max; nfsvers_to_use >= vers_min;
        nfsvers_to_use--) {
        /*
         * getaddr_nfs will also fill in the fh for us.
         */
        r = getaddr_nfs(args, fshost, nconfp,
                TRUE, path, port, NULL, FALSE);

        if (r == RET_OK) {
            /*
             * Since we are using the public fh, and NLM is
             * not firewall friendly, use local locking.
             * Not the case for v4.
             */
            *versp = nfsvers_to_use;
            switch (nfsvers_to_use) {
            case NFS_V4:
                fstype = MNTTYPE_NFS4;
                break;
            case NFS_V3:
                fstype = MNTTYPE_NFS3;
                /* fall through to pick up llock option */
            default:
                args->flags |= NFSMNT_LLOCK;
                break;
            }
            if (fspath != path)
                free(path);

            return (r);
        }
    }

    if (fspath != path) {
        free(path);
    }

    if (loud == TRUE) {
        pr_err(gettext("Could not use public filehandle in request to"
            " server %s\n"), fshost);
    }

    return (r);
}

/*
 * get fhandle of remote path from server's mountd
 */
static int
get_fh(struct nfs_args *args, char *fshost, char *fspath, int *versp,
    bool_t loud_on_mnt_err, struct netconfig **nconfp, ushort_t port)
{
    static struct fhstatus fhs;
    static struct mountres3 mountres3;
    static struct pathcnf p;
    nfs_fh3 *fh3p;
    struct timeval timeout = { 25, 0};
    CLIENT *cl;
    enum clnt_stat rpc_stat;
    rpcvers_t outvers = 0;
    rpcvers_t vers_to_try;
    rpcvers_t vers_min;
    static int printed = 0;
    int count, i, *auths;
    char *msg;

    switch (nfsvers) {
    case 2: /* version 2 specified try that only */
        vers_to_try = MOUNTVERS_POSIX;
        vers_min = MOUNTVERS;
        break;
    case 3: /* version 3 specified try that only */
        vers_to_try = MOUNTVERS3;
        vers_min = MOUNTVERS3;
        break;
    case 4: /* version 4 specified try that only */
        /*
         * This assignment is in the wrong version sequence.
         * The above are MOUNT program and this is NFS
         * program.  However, it happens to work out since the
         * two don't collide for NFSv4.
         */
        vers_to_try = NFS_V4;
        vers_min = NFS_V4;
        break;
    default: /* no version specified, start with default */
        /*
         * If the retry version is set, use that. This will
         * be set if the last mount attempt returned any other
         * besides an RPC error.
         */
        if (nfsretry_vers)
            vers_to_try = nfsretry_vers;
        else {
            vers_to_try = vers_max_default;
            vers_min = vers_min_default;
        }

        break;
    }

    /*
     * In the case of version 4, just NULL proc the server since
     * there is no MOUNT program.  If this fails, then decrease
     * vers_to_try and continue on with regular MOUNT program
     * processing.
     */
    if (vers_to_try == NFS_V4) {
        int savevers = nfsvers_to_use;
        err_ret_t error;
        int retval;
        SET_ERR_RET(&error, ERR_PROTO_NONE, 0);

        /* Let's hope for the best */
        nfsvers_to_use = NFS_V4;
        retval =
            getaddr_nfs(args, fshost, nconfp, FALSE,
                    fspath, port, &error, vers_min == NFS_V4);

        if (retval == RET_OK) {
            *versp = nfsvers_to_use = NFS_V4;
            fstype = MNTTYPE_NFS4;
            args->fh = strdup(fspath);
            if (args->fh == NULL) {
                pr_err(gettext("no memory\n"));
                *versp = nfsvers_to_use = savevers;
                return (RET_ERR);
            }
            return (RET_OK);
        }
        nfsvers_to_use = savevers;

        vers_to_try--;
        /* If no more versions to try, let the user know. */
        if (vers_to_try < vers_min) {
            return (retval);
        }

        /*
         * If we are here, there are more versions to try but
         * there has been an error of some sort.  If it is not
         * an RPC error (e.g. host unknown), we just stop and
         * return the error since the other versions would see
         * the same error as well.
         */
        if (retval == RET_ERR && error.error_type != ERR_RPCERROR)
            return (retval);
    }

    while ((cl = clnt_create_vers(fshost, MOUNTPROG, &outvers,
            vers_min, vers_to_try, "datagram_v")) == NULL) {
        if (rpc_createerr.cf_stat == RPC_UNKNOWNHOST) {
            pr_err(gettext("%s: %s\n"), fshost,
                clnt_spcreateerror(""));
            return (RET_ERR);
        }

        /*
         * We don't want to downgrade version on lost packets
         */
        if ((rpc_createerr.cf_stat == RPC_TIMEDOUT) ||
            (rpc_createerr.cf_stat == RPC_PMAPFAILURE)) {
            pr_err(gettext("%s: %s\n"), fshost,
                clnt_spcreateerror(""));
            return (RET_RETRY);
        }

        /*
         * back off and try the previous version - patch to the
         * problem of version numbers not being contigous and
         * clnt_create_vers failing (SunOS4.1 clients & SGI servers)
         * The problem happens with most non-Sun servers who
         * don't support mountd protocol #2. So, in case the
         * call fails, we re-try the call anyway.
         */
        vers_to_try--;
        if (vers_to_try < vers_min) {
            if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH) {
                if (nfsvers == 0) {
                    pr_err(gettext(
            "%s:%s: no applicable versions of NFS supported\n"),
                        fshost, fspath);
                } else {
                    pr_err(gettext(
            "%s:%s: NFS Version %d not supported\n"),
                        fshost, fspath, nfsvers);
                }
                return (RET_ERR);
            }
            if (!printed) {
                pr_err(gettext("%s: %s\n"), fshost,
                    clnt_spcreateerror(""));
                printed = 1;
            }
            return (RET_RETRY);
        }
    }
    if (posix && outvers < MOUNTVERS_POSIX) {
        pr_err(gettext("%s: %s: no pathconf info\n"),
            fshost, clnt_sperror(cl, ""));
        clnt_destroy(cl);
        return (RET_ERR);
    }

    if (__clnt_bindresvport(cl) < 0) {
        pr_err(gettext("Couldn't bind to reserved port\n"));
        clnt_destroy(cl);
        return (RET_RETRY);
    }

    if ((cl->cl_auth = authsys_create_default()) == NULL) {
        pr_err(
            gettext("Couldn't create default authentication handle\n"));
        clnt_destroy(cl);
        return (RET_RETRY);
    }

    switch (outvers) {
    case MOUNTVERS:
    case MOUNTVERS_POSIX:
        *versp = nfsvers_to_use = NFS_VERSION;
        rpc_stat = clnt_call(cl, MOUNTPROC_MNT, xdr_dirpath,
            (caddr_t)&fspath, xdr_fhstatus, (caddr_t)&fhs, timeout);
        if (rpc_stat != RPC_SUCCESS) {
            pr_err(gettext("%s:%s: server not responding %s\n"),
                fshost, fspath, clnt_sperror(cl, ""));
            clnt_destroy(cl);
            return (RET_RETRY);
        }

        if ((errno = fhs.fhs_status) != MNT_OK) {
            if (loud_on_mnt_err) {
                if (errno == EACCES) {
                pr_err(gettext("%s:%s: access denied\n"),
                    fshost, fspath);
                } else {
                pr_err(gettext("%s:%s: %s\n"), fshost, fspath,
                    strerror(errno));
                }
            }
            clnt_destroy(cl);
            return (RET_MNTERR);
        }
        args->fh = malloc(sizeof (fhs.fhstatus_u.fhs_fhandle));
        if (args->fh == NULL) {
            pr_err(gettext("no memory\n"));
            return (RET_ERR);
        }
        memcpy((caddr_t)args->fh, (caddr_t)&fhs.fhstatus_u.fhs_fhandle,
            sizeof (fhs.fhstatus_u.fhs_fhandle));
        if (!errno && posix) {
            rpc_stat = clnt_call(cl, MOUNTPROC_PATHCONF,
                xdr_dirpath, (caddr_t)&fspath, xdr_ppathcnf,
                (caddr_t)&p, timeout);
            if (rpc_stat != RPC_SUCCESS) {
                pr_err(gettext(
                    "%s:%s: server not responding %s\n"),
                    fshost, fspath, clnt_sperror(cl, ""));
                free(args->fh);
                clnt_destroy(cl);
                return (RET_RETRY);
            }
            if (_PC_ISSET(_PC_ERROR, p.pc_mask)) {
                pr_err(gettext(
                    "%s:%s: no pathconf info\n"),
                    fshost, fspath);
                free(args->fh);
                clnt_destroy(cl);
                return (RET_ERR);
            }
            args->flags |= NFSMNT_POSIX;
            args->pathconf = malloc(sizeof (p));
            if (args->pathconf == NULL) {
                pr_err(gettext("no memory\n"));
                free(args->fh);
                clnt_destroy(cl);
                return (RET_ERR);
            }
            memcpy((caddr_t)args->pathconf, (caddr_t)&p,
                sizeof (p));
        }
        break;

    case MOUNTVERS3:
        *versp = nfsvers_to_use = NFS_V3;
        rpc_stat = clnt_call(cl, MOUNTPROC_MNT, xdr_dirpath,
                (caddr_t)&fspath,
                xdr_mountres3, (caddr_t)&mountres3, timeout);
        if (rpc_stat != RPC_SUCCESS) {
            pr_err(gettext("%s:%s: server not responding %s\n"),
                fshost, fspath, clnt_sperror(cl, ""));
            clnt_destroy(cl);
            return (RET_RETRY);
        }

        /*
         * Assume here that most of the MNT3ERR_*
         * codes map into E* errors.
         */
        if ((errno = mountres3.fhs_status) != MNT_OK) {
            if (loud_on_mnt_err) {
            switch (errno) {
            case MNT3ERR_NAMETOOLONG:
                msg = "path name is too long";
                break;
            case MNT3ERR_NOTSUPP:
                msg = "operation not supported";
                break;
            case MNT3ERR_SERVERFAULT:
                msg = "server fault";
                break;
            default:
                msg = strerror(errno);
                break;
            }
            pr_err(gettext("%s:%s: %s\n"), fshost, fspath, msg);
            }
            clnt_destroy(cl);
            return (RET_MNTERR);
        }

        fh3p = (nfs_fh3 *)malloc(sizeof (*fh3p));
        if (fh3p == NULL) {
            pr_err(gettext("no memory\n"));
            return (RET_ERR);
        }
        fh3p->fh3_length =
            mountres3.mountres3_u.mountinfo.fhandle.fhandle3_len;
        (void) memcpy(fh3p->fh3_u.data,
            mountres3.mountres3_u.mountinfo.fhandle.fhandle3_val,
            fh3p->fh3_length);
        args->fh = (caddr_t)fh3p;
        fstype = MNTTYPE_NFS3;

        /*
         * Check the security flavor to be used.
         *
         * If "secure" or "sec=flavor" is a mount
         * option, check if the server supports the "flavor".
         * If the server does not support the flavor, return
         * error.
         *
         * If no mount option is given then use the first supported
         * security flavor (by the client) in the auth list returned
         * from the server.
         *
         */
        auths =
        mountres3.mountres3_u.mountinfo.auth_flavors.auth_flavors_val;
        count =
        mountres3.mountres3_u.mountinfo.auth_flavors.auth_flavors_len;

        if (sec_opt) {
            for (i = 0; i < count; i++) {
                if (auths[i] == nfs_sec.sc_nfsnum)
                    break;
            }
            if (i >= count) {
                goto autherr;
            }
        } else {
            if (count > 0) {
            for (i = 0; i < count; i++) {
                if (!nfs_getseconfig_bynumber(auths[i], &nfs_sec)) {
                sec_opt++;
                break;
                }
            }
            if (i >= count) {
                goto autherr;
            }
            }
        }
        break;
    default:
        pr_err(gettext("%s:%s: Unknown MOUNT version %d\n"),
            fshost, fspath, outvers);
        clnt_destroy(cl);
        return (RET_ERR);
    }

    clnt_destroy(cl);
    return (RET_OK);

autherr:
    pr_err(gettext(
        "security mode does not match the server exporting %s:%s\n"),
        fshost, fspath);
    clnt_destroy(cl);
    return (RET_ERR);
}

/*
 * Fill in the address for the server's NFS service and
 * fill in a knetconfig structure for the transport that
 * the service is available on.
 */
static int
getaddr_nfs(struct nfs_args *args, char *fshost, struct netconfig **nconfp,
        bool_t get_pubfh, char *fspath, ushort_t port, err_ret_t *error,
        bool_t print_rpcerror)
{
    struct stat sb;
    struct netconfig *nconf;
    struct knetconfig *knconfp;
    static int printed = 0;
    struct t_info tinfo;
    err_ret_t addr_error;

    SET_ERR_RET(error, ERR_PROTO_NONE, 0);
    SET_ERR_RET(&addr_error, ERR_PROTO_NONE, 0);

    if (nfs_proto) {
        /*
         * If a proto is specified and its rdma try this. The kernel
         * will later do the reachablity test and fail form there
         * if rdma transport is not available to kernel rpc
         */
        if (strcmp(nfs_proto, "rdma") == 0) {
            args->addr = get_addr(fshost, NFS_PROGRAM,
                nfsvers_to_use, nconfp, NULL, port, &tinfo,
                &args->fh, get_pubfh, fspath, &addr_error);

            args->flags |= NFSMNT_DORDMA;
        } else {
            args->addr = get_addr(fshost, NFS_PROGRAM,
                nfsvers_to_use, nconfp, nfs_proto, port, &tinfo,
                &args->fh, get_pubfh, fspath, &addr_error);
        }
    } else {
        args->addr = get_addr(fshost, NFS_PROGRAM, nfsvers_to_use,
            nconfp, nfs_proto, port, &tinfo, &args->fh, get_pubfh,
            fspath, &addr_error);
        /*
         * If no proto is specified set this flag.
         * Kernel mount code will try to use RDMA if its on the
         * system, otherwise it will keep on using the protocol
         * selected here, through the above get_addr call.
         */
        if (nfs_proto == NULL)
            args->flags |= NFSMNT_TRYRDMA;
    }

    if (args->addr == NULL) {
        /*
         * We could have failed because the server had no public
         * file handle support. So don't print a message and don't
         * retry.
         */
        if (get_pubfh == TRUE)
            return (RET_ERR);

        if (!printed) {
            switch (addr_error.error_type) {
            case 0:
                printed = 1;
                break;
            case ERR_RPCERROR:
                if (!print_rpcerror)
                    /* no error print at this time */
                    break;
                pr_err(gettext("%s NFS service not"
                        " available %s\n"), fshost,
                    clnt_sperrno(addr_error.error_value));
                printed = 1;
                break;
            case ERR_NETPATH:
                pr_err(gettext("%s: Error in NETPATH.\n"),
                    fshost);
                printed = 1;
                break;
            case ERR_PROTO_INVALID:
                pr_err(gettext("%s: NFS service does not"
                    " recognize protocol: %s.\n"), fshost,
                    nfs_proto);
                printed = 1;
                break;
            case ERR_PROTO_UNSUPP:
                if (nfsvers || nfsvers_to_use == NFS_VERSMIN) {
                    /*
                     * Don't set "printed" here. Since we
                     * have to keep checking here till we
                     * exhaust transport errors on all vers.
                     *
                     * Print this message if:
                     * 1. After we have tried all versions
                     *    of NFS and none support the asked
                     *    transport.
                     *
                     * 2. If a version is specified and it
                     *    does'nt support the asked
                     *    transport.
                     *
                     * Otherwise we decrement the version
                     * and retry below.
                     */
                    pr_err(gettext("%s: NFS service does"
                        " not support protocol: %s.\n"),
                        fshost, nfs_proto);
                }
                break;
            case ERR_NOHOST:
                pr_err("%s: %s\n", fshost, "Unknown host");
                printed = 1;
                break;
            default:
                /* case ERR_PROTO_NONE falls through */
                pr_err(gettext("%s: NFS service not responding"
                    "\n"), fshost);
                printed = 1;
                break;
            }
        }
        SET_ERR_RET(error,
            addr_error.error_type, addr_error.error_value);
        if (addr_error.error_type == ERR_PROTO_NONE)
            return (RET_RETRY);
        else if (addr_error.error_type == ERR_RPCERROR &&
            ! IS_UNRECOVERABLE_RPC(addr_error.error_value)) {
            return (RET_RETRY);
        } else if (nfsvers == 0 && addr_error.error_type ==
            ERR_PROTO_UNSUPP && nfsvers_to_use != NFS_VERSMIN) {
            /*
             * If no version is specified, and the error is due
             * to an unsupported transport, then decrement the
             * version and retry.
             */
            return (RET_RETRY);
        } else
            return (RET_ERR);
    }
    nconf = *nconfp;

    if (stat(nconf->nc_device, &sb) < 0) {
        pr_err(gettext("getaddr_nfs: couldn't stat: %s: %s\n"),
            nconf->nc_device, strerror(errno));
        return (RET_ERR);
    }

    knconfp = (struct knetconfig *)malloc(sizeof (*knconfp));
    if (!knconfp) {
        pr_err(gettext("no memory\n"));
        return (RET_ERR);
    }
    knconfp->knc_semantics = nconf->nc_semantics;
    knconfp->knc_protofmly = nconf->nc_protofmly;
    knconfp->knc_proto = nconf->nc_proto;
    knconfp->knc_rdev = sb.st_rdev;

    /* make sure we don't overload the transport */
    if (tinfo.tsdu > 0 && tinfo.tsdu < NFS_MAXDATA + NFS_RPC_HDR) {
        args->flags |= (NFSMNT_RSIZE | NFSMNT_WSIZE);
        if (args->rsize == 0 || args->rsize > tinfo.tsdu - NFS_RPC_HDR)
            args->rsize = tinfo.tsdu - NFS_RPC_HDR;
        if (args->wsize == 0 || args->wsize > tinfo.tsdu - NFS_RPC_HDR)
            args->wsize = tinfo.tsdu - NFS_RPC_HDR;
    }

    args->flags |= NFSMNT_KNCONF;
    args->knconf = knconfp;
    return (RET_OK);
}

static int
retry(struct mnttab *mntp, int ro)
{
    int delay = 5;
    int count = retries;
    int r;

    /*
     * Please see comments on nfsretry_vers in the beginning of this file
     * and in main() routine.
     */

    if (bg) {
        if (fork() > 0)
            return (RET_OK);
        pr_err(gettext("backgrounding: %s\n"), mntp->mnt_mountp);
        backgrounded = 1;
    } else {
        if (!nfsretry_vers)
            pr_err(gettext("retrying: %s\n"), mntp->mnt_mountp);
    }

    while (count--) {
        if ((r = mount_nfs(mntp, ro, NULL)) == RET_OK) {
            pr_err(gettext("%s: mounted OK\n"), mntp->mnt_mountp);
            return (RET_OK);
        }
        if (r != RET_RETRY)
            break;

        if (count > 0) {
            (void) sleep(delay);
            delay *= 2;
            if (delay > 120)
                delay = 120;
        }
    }

    if (!nfsretry_vers)
        pr_err(gettext("giving up on: %s\n"), mntp->mnt_mountp);

    return (RET_ERR);
}

/*
 * Read the /etc/default/nfs configuration file to determine if the
 * client has been configured for a new min/max for the NFS version to
 * use.
 */
static void
read_default(void)
{
    char *defval;
    int errno;
    int tmp;

    /* Fail silently if error in opening the default nfs config file */
    if ((defopen(NFSADMIN)) == 0) {
        if ((defval = defread("NFS_CLIENT_VERSMIN=")) != NULL) {
            errno = 0;
            tmp = strtol(defval, (char **)NULL, 10);
            if (errno == 0) {
                vers_min_default = tmp;
            }
        }
        if ((defval = defread("NFS_CLIENT_VERSMAX=")) != NULL) {
            errno = 0;
            tmp = strtol(defval, (char **)NULL, 10);
            if (errno == 0) {
                vers_max_default = tmp;
            }
        }
        /* close defaults file */
        defopen(NULL);
    }
}

static void
sigusr1(int s)
{
}