nfs/mountd/exportlist.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 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <string.h>
#include <syslog.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/time.h>
#include <errno.h>
#include <rpcsvc/mount.h>
#include <sys/pathconf.h>
#include <sys/systeminfo.h>
#include <sys/utsname.h>
#include <signal.h>
#include <locale.h>
#include <unistd.h>
#include <thread.h>
#include <sharefs/share.h>
#include <sharefs/sharetab.h>
#include "../lib/sharetab.h"
#include "mountd.h"

static void freeexports(struct exportnode *);
static struct groupnode **newgroup(char *, struct groupnode **);
static struct exportnode **newexport(char *, struct groupnode *,
                        struct exportnode **);

static char *optlist[] = {
#define OPT_RO      0
    SHOPT_RO,
#define OPT_RW      1
    SHOPT_RW,
    NULL
};

/*
 * Send current export list to a client
 */
void
export(struct svc_req *rqstp)
{
    SVCXPRT *transp;
    struct exportnode *exportlist;
    struct exportnode **tail;
    struct groupnode *groups;
    struct groupnode **grtail;
    struct share *sh;
    struct sh_list *shp;
    char *gr, *p, *opts, *val, *lasts;

    int export_to_everyone;

    transp = rqstp->rq_xprt;
    if (!svc_getargs(transp, xdr_void, NULL)) {
        svcerr_decode(transp);
        return;
    }

    check_sharetab();

    exportlist = NULL;
    tail = &exportlist;

    (void) rw_rdlock(&sharetab_lock);

    for (shp = share_list; shp; shp = shp->shl_next) {

        groups = NULL;
        grtail = &groups;

        sh = shp->shl_sh;

        /*
         * Check for "ro" or "rw" list without argument values.  This
         * indicates export to everyone.  Unfortunately, SunOS 4.x
         * automounter uses this, and it is indicated indirectly with
         * 'showmount -e'.
         *
         * If export_to_everyone is 1, then groups should be NULL to
         * indicate export to everyone.
         */

        opts = strdup(sh->sh_opts);
        p = opts;


        export_to_everyone = 0;
        while (*p) {
            switch (getsubopt(&p, optlist, &val)) {
            case OPT_RO:
            case OPT_RW:
                if (val == NULL)
                    export_to_everyone = 1;
                break;
            }
        }

        free(opts);

        if (export_to_everyone == 0) {

            opts = strdup(sh->sh_opts);
            p = opts;

            /*
             * Just concatenate all the hostnames/groups
             * from the "ro" and "rw" lists for each flavor.
             * This list is rather meaningless now, but
             * that's what the protocol demands.
             */
            while (*p) {
                switch (getsubopt(&p, optlist, &val)) {
                case OPT_RO:
                case OPT_RW:

                    while ((gr = strtok_r(val, ":", &lasts))
                        != NULL) {
                        val = NULL;
                        grtail = newgroup(gr, grtail);
                    }
                    break;
                }
            }

            free(opts);
        }
        tail = newexport(sh->sh_path, groups, tail);
    }

    (void) rw_unlock(&sharetab_lock);

    errno = 0;
    if (!svc_sendreply(transp, xdr_exports, (char *)&exportlist))
        log_cant_reply(transp);

    freeexports(exportlist);
}


static void
freeexports(struct exportnode *ex)
{
    struct groupnode *groups, *tmpgroups;
    struct exportnode *tmpex;

    while (ex) {
        groups = ex->ex_groups;
        while (groups) {
            tmpgroups = groups->gr_next;
            free(groups->gr_name);
            free(groups);
            groups = tmpgroups;
        }
        tmpex = ex->ex_next;
        free(ex->ex_dir);
        free(ex);
        ex = tmpex;
    }
}


static struct groupnode **
newgroup(char *grname, struct groupnode **tail)
{
    struct groupnode *new;
    char *newname;

    new = exmalloc(sizeof (*new));
    newname = exmalloc(strlen(grname) + 1);
    (void) strcpy(newname, grname);

    new->gr_name = newname;
    new->gr_next = NULL;
    *tail = new;
    return (&new->gr_next);
}


static struct exportnode **
newexport(char *grname, struct groupnode *grplist, struct exportnode **tail)
{
    struct exportnode *new;
    char *newname;

    new = exmalloc(sizeof (*new));
    newname = exmalloc(strlen(grname) + 1);
    (void) strcpy(newname, grname);

    new->ex_dir = newname;
    new->ex_groups = grplist;
    new->ex_next = NULL;
    *tail = new;
    return (&new->ex_next);
}