i386/sys/uadmin.c

	uadmin.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#pragma weak uadmin = _uadmin

/*
 * Wrapper function to implement reboot w/ arguments on x86
 * platforms. Extract reboot arguments and place them in
 * in a transient entry in /[stub]boot/grub/menu.lst
 * All other commands are passed through.
 */

#include "synonyms.h"
#include <fcntl.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/uadmin.h>
#include <unistd.h>
#include <string.h>

#define MAX_BOOTARG 256

static int
legal_arg(char *bargs)
{
    int i;

    for (i = 0; i < MAX_BOOTARG; i++, bargs++) {
        if (*bargs == 0 && i > 0)
            return (i);
        if (!isprint(*bargs))
            break;
    }
    return (-1);
}

static char quote[] = "\'";

int
uadmin(int cmd, int fcn, uintptr_t mdep)
{
    extern int __uadmin(int cmd, int fcn, uintptr_t mdep);
    char *bargs, cmdbuf[256];
    struct stat sbuf;
    char *altroot;

    bargs = (char *)mdep;
    if (geteuid() == 0 && (cmd == A_SHUTDOWN || cmd == A_REBOOT)) {
        switch (fcn) {
        case AD_IBOOT:
        case AD_SBOOT:
        case AD_SIBOOT:
            /*
             * These functions fabricate appropriate bootargs.
             * If bootargs are passed in, map these functions
             * to AD_BOOT.
             */
            if (bargs == 0) {
                switch (fcn) {
                case AD_IBOOT:
                    bargs = "-a";
                    break;
                case AD_SBOOT:
                    bargs = "-s";
                    break;
                case AD_SIBOOT:
                    bargs = "-sa";
                    break;
                }
            }
            /*FALLTHROUGH*/
        case AD_BOOT:
            if (bargs == 0)
                break;  /* no args */
            if (legal_arg(bargs) < 0)
                break;  /* bad args */

            /* check for /stubboot */
            if (stat("/stubboot/boot/grub/menu.lst", &sbuf) == 0) {
                altroot = "-R /stubboot ";
            } else {
                altroot = "";
            }

            /* are we rebooting to a GRUB menu entry? */
            if (isdigit(bargs[0])) {
                int entry = strtol(bargs, NULL, 10);
                (void) snprintf(cmdbuf, sizeof (cmdbuf),
                    "/sbin/bootadm set-menu %sdefault=%d",
                    altroot, entry);
            } else {
                (void) snprintf(cmdbuf, sizeof (cmdbuf),
                    "/sbin/bootadm -m update_temp %s"
                    "-o %s%s%s", altroot, quote, bargs, quote);
            }
            (void) system(cmdbuf);
        }
    }
    return (__uadmin(cmd, fcn, mdep));
}