libnsl/nsl/t_rcvuderr.c

/*
 * 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.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"    /* SVr4.0 1.5 */

#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);
}