sun_fc/common/Sun_fcAdapterCreateWWN.cc

/*
 * 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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */


#include <fstream>
#include "fcntl.h"
#include "Handle.h"
#include "Trace.h"
#include "Exceptions.h"
#include "sun_fc.h"


#ifdef  __cplusplus
extern "C" {
#endif

void get_random_bytes(HBA_UINT8 *ptr, size_t len) {
    int fd = open("/dev/urandom", O_RDONLY);
    size_t resid = len;
    ssize_t bytes;

    while (resid != 0) {
        bytes = read(fd, ptr, resid);
        ptr += bytes;
        resid -= bytes;
    }
    close (fd);
    return;
}

HBA_STATUS Sun_fcAdapterCreateWWN(HBA_HANDLE handle,
    HBA_UINT32 portindex, HBA_WWN *nwwn, HBA_WWN *pwwn,
    HBA_WWN *OUI, HBA_INT32 method) {
    HBA_UINT8   randombyte[5] = {0};
    HBA_WWN     randomwwn = {0};
    int     index = 0;

        Trace log("Sun_fcAdapterCreateWWN");

        if ((nwwn == NULL) || (pwwn == NULL)) {
                log.userError(
                    "NULL WWN pointer");
                return (HBA_STATUS_ERROR_ARG);
        }
    if (method == HBA_CREATE_WWN_FACTORY) {
        return (HBA_STATUS_ERROR_NOT_SUPPORTED);
    }

        try {
        /* create EUI-64 Mapped WWN */
        if (OUI == NULL) {
            /* if no OUI spec'd, used one of Sun's */
            randomwwn.wwn[index++] = 0x0;
            randomwwn.wwn[index++] = 0x0;
            randomwwn.wwn[index++] = 0x7D;
        } else {
            memcpy(randomwwn.wwn, OUI->wwn, sizeof(HBA_WWN));
            index += 3;
        }
        /*
         * for EUI-64 mapped, shift OUI first byte right two bits
         * then set top two bits to 11
         */
        randomwwn.wwn[0] = randomwwn.wwn[0] >> 2;
        randomwwn.wwn[0] = randomwwn.wwn[0] | 0xc0;

        /* now create and add 40 random bits */
        get_random_bytes(randombyte, 5);
        memcpy(randomwwn.wwn+index, randombyte, 5);

        memcpy(nwwn->wwn, randomwwn.wwn, sizeof(HBA_WWN));

        /* toggle lowest bit, to make NWWN and PWWN unique */
        randomwwn.wwn[7] = randomwwn.wwn[7] ^ 1;
        memcpy(pwwn->wwn, randomwwn.wwn, sizeof(HBA_WWN));

                return (HBA_STATUS_OK);
        } catch (HBAException &e) {
                return (e.getErrorCode());
        } catch (...) {
                log.internalError(
                    "Uncaught exception");
                return (HBA_STATUS_ERROR);
        }
}
#ifdef  __cplusplus
}
#endif