/*
 * 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.
 */

/*
 * consolelog.c: support for the scadm consolelog option (to display the
 * service processor console log)
 */

#include <libintl.h>
#include <stdio.h>
#include <string.h>
#include <time.h>  /* required by librsc.h */
#include <limits.h>

#include "librsc.h"
#include "adm.h"

/* #define DEBUG */

void
ADM_Process_console_log(int all)
{
        rscp_msg_t              Message;
        struct timespec         Timeout;
        dp_get_console_log_r_t  *rscReply;
        rsci64                  bytes_remaining, seqno;
        rsci16                  request_size, response_size;
        dp_get_console_log_t    rscCmd;

        ADM_Start();

        /*
         * Start by sending a zero-length request to ALOM, so that
         * we can learn the length of the console log.  We expect
         * ALOM to return the length of the entire log.  We get
         * a snapshot of the length of the log here - it may however
         * continue to grow as we're reading it.  We read only as
         * much of the log as we get in this snapshot.
         */
        rscCmd.start_seq = 0;
        rscCmd.length = 0;
        Message.type = DP_GET_CONSOLE_LOG;
        Message.len = sizeof (rscCmd);
        Message.data = (char *)&rscCmd;
        ADM_Send(&Message);

        Timeout.tv_nsec = 0;
        Timeout.tv_sec  = ADM_TIMEOUT;
        ADM_Recv(&Message, &Timeout,
            DP_GET_CONSOLE_LOG_R, sizeof (*rscReply));

        rscReply = (dp_get_console_log_r_t *)Message.data;

        /*
         * If we do not want the whole log, and the log is bigger than
         * the length limit, then fetch just the last ADM_DEFAULT_LOG_LENGTH
         * bytes from the log.  Else just get the whole thing.
         */
        if ((all == 0) && (rscReply->remaining_log_bytes >
            ADM_DEFAULT_LOG_LENGTH)) {
                bytes_remaining = ADM_DEFAULT_LOG_LENGTH;
                seqno = (rscReply->remaining_log_bytes +
                    rscReply->next_seq) - bytes_remaining;
        } else {
                bytes_remaining = rscReply->remaining_log_bytes;
                seqno = rscReply->next_seq;
        }
        request_size = sizeof (rscReply->buffer);
        ADM_Free(&Message);

        /*
         * Timeout for RSC response.
         */
        Timeout.tv_nsec = 0;
        Timeout.tv_sec  = ADM_TIMEOUT;

        /*
         * This loop runs as long as there is data in the log, or until
         * we hit the default limit (above).  It's possible that ALOM may
         * shrink the log - we need to account for this.  If ALOM returns
         * no data, we bail out.
         */
        while (bytes_remaining) {
                rscCmd.start_seq = seqno;
                rscCmd.length = (bytes_remaining < request_size) ?
                    bytes_remaining : request_size;
                Message.type = DP_GET_CONSOLE_LOG;
                Message.len = sizeof (rscCmd);
                Message.data = (char *)&rscCmd;
                ADM_Send(&Message);

                ADM_Recv(&Message, &Timeout,
                    DP_GET_CONSOLE_LOG_R, sizeof (*rscReply));

                rscReply = (dp_get_console_log_r_t *)Message.data;

                /* If ALOM returns zero bytes, we're done. */
                response_size = rscReply->length;
                if (response_size == 0) {
                        ADM_Free(&Message);
                        break;
                }
                bytes_remaining -= response_size;
                if (rscReply->remaining_log_bytes < bytes_remaining) {
                        bytes_remaining = rscReply->remaining_log_bytes;
                }

                /*
                 * If the byte at the original sequence number is no
                 * longer in the log, print a message.
                 */
                if (rscReply->next_seq > seqno + response_size) {
                        printf(gettext("\nscadm: lost %d bytes of log data\n"),
                            rscReply->next_seq - (seqno + response_size));
                }
                seqno = rscReply->next_seq;

                /* Print the console log */
                if (fwrite(rscReply->buffer, sizeof (char), response_size,
                    stdout) != response_size) {
                        perror(gettext("\ncouldn't write console log buffer"
                            " to stdout"));
                        ADM_Free(&Message);
                        break;
                }
                ADM_Free(&Message);
        }
        putchar('\n');
}