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

/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include "mt.h"
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <stropts.h>
#include <sys/stream.h>
#define _SUN_TPI_VERSION 2
#include <sys/tihdr.h>
#include <sys/timod.h>
#include <xti.h>
#include <syslog.h>
#include <assert.h>
#include "tx.h"

int
_tx_rcvuderr(int fd, struct t_uderr *uderr, int api_semantics)
{
        struct strbuf ctlbuf, databuf;
        int flg;
        int retval;
        union T_primitives *pptr;
        struct _ti_user *tiptr;
        int sv_errno;
        int didalloc;
        int use_lookbufs = 0;


        if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
                return (-1);
        sig_mutex_lock(&tiptr->ti_lock);

        if (tiptr->ti_servtype != T_CLTS) {
                t_errno = TNOTSUPPORT;
                sig_mutex_unlock(&tiptr->ti_lock);
                return (-1);
        }
        /*
         * is there a unitdata error indication in look buffer
         */
        if (tiptr->ti_lookcnt > 0) {
                ctlbuf.len = tiptr->ti_lookbufs.tl_lookclen;
                ctlbuf.buf = tiptr->ti_lookbufs.tl_lookcbuf;
                /* Note: cltbuf.maxlen not used in this case */

                /* LINTED pointer cast */
                assert(((union T_primitives *)ctlbuf.buf)->type
                        == T_UDERROR_IND);

                databuf.maxlen = 0;
                databuf.len = 0;
                databuf.buf = NULL;

                use_lookbufs = 1;

        } else {
                if ((retval = _t_look_locked(fd, tiptr, 0,
                    api_semantics)) < 0) {
                        sv_errno = errno;
                        sig_mutex_unlock(&tiptr->ti_lock);
                        errno = sv_errno;
                        return (-1);
                }
                if (retval != T_UDERR) {
                        t_errno = TNOUDERR;
                        sig_mutex_unlock(&tiptr->ti_lock);
                        return (-1);
                }

                /*
                 * Acquire ctlbuf for use in sending/receiving control part
                 * of the message.
                 */
                if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
                        sv_errno = errno;
                        sig_mutex_unlock(&tiptr->ti_lock);
                        errno = sv_errno;
                        return (-1);
                }

                databuf.maxlen = 0;
                databuf.len = 0;
                databuf.buf = NULL;

                flg = 0;

                /*
                 * Since we already verified that a unitdata error
                 * indication is pending, we assume that this getmsg()
                 * will not block indefinitely.
                 */
                if ((retval = getmsg(fd, &ctlbuf, &databuf, &flg)) < 0) {

                        t_errno = TSYSERR;
                        goto err_out;
                }
                /*
                 * did I get entire message?
                 */
                if (retval > 0) {
                        t_errno = TSYSERR;
                        errno = EIO;
                        goto err_out;
                }

        }

        /* LINTED pointer cast */
        pptr = (union T_primitives *)ctlbuf.buf;

        if ((ctlbuf.len < (int)sizeof (struct T_uderror_ind)) ||
            (pptr->type != T_UDERROR_IND)) {
                t_errno = TSYSERR;
                errno = EPROTO;
                goto err_out;
        }

        if (uderr) {
                if (_T_IS_TLI(api_semantics) || uderr->addr.maxlen > 0) {
                        if (TLEN_GT_NLEN(pptr->uderror_ind.DEST_length,
                            uderr->addr.maxlen)) {
                                t_errno = TBUFOVFLW;
                                goto err_out;
                        }
                        (void) memcpy(uderr->addr.buf, ctlbuf.buf +
                            pptr->uderror_ind.DEST_offset,
                            (size_t)pptr->uderror_ind.DEST_length);
                        uderr->addr.len =
                            (unsigned int)pptr->uderror_ind.DEST_length;
                }
                if (_T_IS_TLI(api_semantics) || uderr->addr.maxlen > 0) {
                        if (TLEN_GT_NLEN(pptr->uderror_ind.OPT_length,
                            uderr->opt.maxlen)) {
                                t_errno = TBUFOVFLW;
                                goto err_out;
                        }
                        (void) memcpy(uderr->opt.buf, ctlbuf.buf +
                            pptr->uderror_ind.OPT_offset,
                            (size_t)pptr->uderror_ind.OPT_length);
                        uderr->opt.len =
                            (unsigned int)pptr->uderror_ind.OPT_length;
                }
                uderr->error = pptr->uderror_ind.ERROR_type;
        }

        _T_TX_NEXTSTATE(T_RCVUDERR, tiptr,
                        "t_rcvuderr: invalid state event T_RCVUDERR");
        if (use_lookbufs)
                _t_free_looklist_head(tiptr);
        else {
                if (didalloc)
                        free(ctlbuf.buf);
                else
                        tiptr->ti_ctlbuf = ctlbuf.buf;
        }
        sig_mutex_unlock(&tiptr->ti_lock);
        return (0);

err_out:
        sv_errno = errno;

        if (use_lookbufs)
                _t_free_looklist_head(tiptr);
        else {
                if (didalloc)
                        free(ctlbuf.buf);
                else
                        tiptr->ti_ctlbuf = ctlbuf.buf;
        }
        sig_mutex_unlock(&tiptr->ti_lock);
        errno = sv_errno;
        return (-1);
}