libnsl/nsl/t_connect.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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"    /* SVr4.0 1.7 */

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

/*
 * If a system call fails with EINTR after T_CONN_REQ is sent out,
 * we change state for caller to continue with t_rcvconnect(). This
 * semantics is not documented for TLI but is the direction taken with
 * XTI so we adopt it. With this the call establishment is completed
 * by calling t_rcvconnect() even for synchronous endpoints.
 */
int
_tx_connect(
    int fd,
    const struct t_call *sndcall,
    struct t_call *rcvcall,
    int api_semantics
)
{
    int fctlflg;
    struct _ti_user *tiptr;
    sigset_t mask;
    struct strbuf ctlbuf;
    int sv_errno;
    int didalloc;

    if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
        return (-1);

    sig_mutex_lock(&tiptr->ti_lock);
    if (_T_IS_XTI(api_semantics)) {
        /*
         * User level state verification only done for XTI
         * because doing for TLI may break existing applications
         */
        if (tiptr->ti_state != T_IDLE) {
            t_errno = TOUTSTATE;
            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);
    }
    /*
     * Block all signals until T_CONN_REQ sent and
     * acked with T_OK_ACK/ERROR_ACK
     */
    (void) thr_sigsetmask(SIG_SETMASK, &fillset, &mask);
    if (_t_snd_conn_req(tiptr, sndcall, &ctlbuf) < 0) {
        sv_errno = errno;
        (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
        errno = sv_errno;
        /*
         * At the TPI level, the error returned in a T_ERROR_ACK
         * received in response to a T_CONN_REQ for an attempt to
         * establish a duplicate conection has changed to a
         * new t_errno code introduced with XTI (ADDRBUSY).
         * We need to adjust TLI error code to be same as before.
         */
        if (_T_IS_TLI(api_semantics) && t_errno == TADDRBUSY)
            /* TLI only */
            t_errno = TBADADDR;

        goto err_out;
    }
    (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);

    if ((fctlflg = fcntl(fd, F_GETFL, 0)) < 0) {
        t_errno = TSYSERR;
        goto err_out;
    }

    if (fctlflg & (O_NDELAY | O_NONBLOCK)) {
        _T_TX_NEXTSTATE(T_CONNECT2, tiptr,
                "t_connect: invalid state event T_CONNECT2");
        t_errno = TNODATA;
        goto err_out;
    }

    /*
     * Note: The following call to _t_rcv_conn_con blocks awaiting
     * T_CONN_CON from remote client. Therefore it drops the
     * tiptr->lock during the call (and reacquires it)
     */
    if (_t_rcv_conn_con(tiptr, rcvcall, &ctlbuf, api_semantics) < 0) {
        if ((t_errno == TSYSERR && errno == EINTR) ||
            t_errno == TLOOK) {
            _T_TX_NEXTSTATE(T_CONNECT2, tiptr,
                "t_connect: invalid state event T_CONNECT2");
        } else if (t_errno == TBUFOVFLW) {
            _T_TX_NEXTSTATE(T_CONNECT1, tiptr,
                "t_connect: invalid state event T_CONNECT1");
        }
        goto err_out;
    }
    _T_TX_NEXTSTATE(T_CONNECT1, tiptr,
                "t_connect: invalid state event T_CONNECT1");
    /*
     * Update attributes which may have been negotiated during
     * connection establishment for protocols where we suspect
     * such negotiation is likely (e.g. OSI). We do not do it for
     * all endpoints for performance reasons. Also, this code is
     * deliberately done after user level state changes so even
     * the (unlikely) failure case reflects a connected endpoint.
     */
    if (tiptr->ti_tsdusize != 0) {
        if (_t_do_postconn_sync(fd, tiptr) < 0)
            goto err_out;
    }


    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 (didalloc)
        free(ctlbuf.buf);
    else
        tiptr->ti_ctlbuf = ctlbuf.buf;
    sig_mutex_unlock(&tiptr->ti_lock);

    errno = sv_errno;
    return (-1);
}