/*
 * 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.
 */

#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);
}