/*
 * 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 <sys/param.h>
#include <sys/types.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 <signal.h>
#include <assert.h>
#include "tx.h"


/*
 * Snd_conn_req - send connect request message to transport provider.
 * All signals for the caller are blocked during the call to simplify design.
 * (This is OK for a bounded amount of time this routine is expected to
 * execute).  Also, assumes tiptr->ti_lock is held.
 */
int
_t_snd_conn_req(
        struct _ti_user *tiptr,
        const struct t_call *call,
        struct strbuf *ctlbufp)
{
        struct T_conn_req *creq;
        int size;
        int fd;

        assert(MUTEX_HELD(&tiptr->ti_lock));
        fd = tiptr->ti_fd;

        if (tiptr->ti_servtype == T_CLTS) {
                t_errno = TNOTSUPPORT;
                return (-1);
        }

        if (_t_is_event(fd, tiptr) < 0)
                return (-1);

        /* LINTED pointer cast */
        creq = (struct T_conn_req *)ctlbufp->buf;
        creq->PRIM_type = T_CONN_REQ;
        creq->DEST_length = call->addr.len;
        creq->DEST_offset = 0;
        creq->OPT_length = call->opt.len;
        creq->OPT_offset = 0;
        size = (int)sizeof (struct T_conn_req); /* size without any buffers */

        if (call->addr.len) {
                if (_t_aligned_copy(ctlbufp, call->addr.len, size,
                    call->addr.buf, &creq->DEST_offset) < 0) {
                        /*
                         * Aligned copy will overflow buffer allocated based
                         * based on transport maximum address size.
                         * return error.
                         */
                        t_errno = TBADADDR;
                        return (-1);
                }
                size = creq->DEST_offset + creq->DEST_length;
        }
        if (call->opt.len) {
                if (_t_aligned_copy(ctlbufp, call->opt.len, size,
                    call->opt.buf, &creq->OPT_offset) < 0) {
                        /*
                         * Aligned copy will overflow buffer allocated based
                         * on maximum option size in transport.
                         * return error.
                         */
                        t_errno = TBADOPT;
                        return (-1);
                }
                size = creq->OPT_offset + creq->OPT_length;
        }
        if (call->udata.len) {
                if ((tiptr->ti_cdatasize == T_INVALID /* -2 */) ||
                    ((tiptr->ti_cdatasize != T_INFINITE /* -1 */) &&
                        (call->udata.len > (uint32_t)tiptr->ti_cdatasize))) {
                        /*
                         * user data not valid with connect or it
                         * exceeds the limits specified by the transport
                         * provider.
                         */
                        t_errno = TBADDATA;
                        return (-1);
                }
        }

        ctlbufp->len = size;

        /*
         * Assumes signals are blocked so putmsg() will not block
         * indefinitely
         */
        if (putmsg(fd, ctlbufp,
            (struct strbuf *)(call->udata.len? &call->udata: NULL), 0) < 0) {
                t_errno = TSYSERR;
                return (-1);
        }

        if (_t_is_ok(fd, tiptr, T_CONN_REQ) < 0)
                return (-1);
        return (0);
}



/*
 * Rcv_conn_con - get connection confirmation off
 * of read queue
 * Note:
 *      - called holding the tiptr->ti_lock
 */
int
_t_rcv_conn_con(
        struct _ti_user *tiptr,
        struct t_call *call,
        struct strbuf *ctlbufp,
        int api_semantics)
{
        struct strbuf databuf;
        union T_primitives *pptr;
        int retval, fd, sv_errno;
        int didralloc;

        int flg = 0;

        fd = tiptr->ti_fd;

        if (tiptr->ti_servtype == T_CLTS) {
                t_errno = TNOTSUPPORT;
                return (-1);
        }

        /*
         * see if there is something in look buffer
         */
        if (tiptr->ti_lookcnt > 0) {
                t_errno = TLOOK;
                return (-1);
        }

        ctlbufp->len = 0;
        /*
         * Acquire databuf for use in sending/receiving data part
         */
        if (_t_acquire_databuf(tiptr, &databuf, &didralloc) < 0)
                return (-1);

        /*
         * This is a call that may block indefinitely so we drop the
         * lock and allow signals in MT case here and reacquire it.
         * Error case should roll back state changes done above
         * (happens to be no state change here)
         */
        sig_mutex_unlock(&tiptr->ti_lock);
        if ((retval = getmsg(fd, ctlbufp, &databuf, &flg)) < 0) {
                sv_errno = errno;
                if (errno == EAGAIN)
                        t_errno = TNODATA;
                else
                        t_errno = TSYSERR;
                sig_mutex_lock(&tiptr->ti_lock);
                errno = sv_errno;
                goto err_out;
        }
        sig_mutex_lock(&tiptr->ti_lock);

        if (databuf.len == -1) databuf.len = 0;

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

        /*
         * is cntl part large enough to determine message type?
         */
        if (ctlbufp->len < (int)sizeof (t_scalar_t)) {
                t_errno = TSYSERR;
                errno = EPROTO;
                goto err_out;
        }

        /* LINTED pointer cast */
        pptr = (union T_primitives *)ctlbufp->buf;

        switch (pptr->type) {

        case T_CONN_CON:

                if ((ctlbufp->len < (int)sizeof (struct T_conn_con)) ||
                    (pptr->conn_con.OPT_length != 0 &&
                    (ctlbufp->len < (int)(pptr->conn_con.OPT_length +
                    pptr->conn_con.OPT_offset)))) {
                        t_errno = TSYSERR;
                        errno = EPROTO;
                        goto err_out;
                }

                if (call != NULL) {
                        /*
                         * Note: Buffer overflow is an error in XTI
                         * only if netbuf.maxlen > 0
                         */
                        if (_T_IS_TLI(api_semantics) || call->addr.maxlen > 0) {
                                if (TLEN_GT_NLEN(pptr->conn_con.RES_length,
                                    call->addr.maxlen)) {
                                        t_errno = TBUFOVFLW;
                                        goto err_out;
                                }
                                (void) memcpy(call->addr.buf,
                                    ctlbufp->buf + pptr->conn_con.RES_offset,
                                    (size_t)pptr->conn_con.RES_length);
                                call->addr.len = pptr->conn_con.RES_length;
                        }
                        if (_T_IS_TLI(api_semantics) || call->opt.maxlen > 0) {
                                if (TLEN_GT_NLEN(pptr->conn_con.OPT_length,
                                    call->opt.maxlen)) {
                                        t_errno = TBUFOVFLW;
                                        goto err_out;
                                }
                                (void) memcpy(call->opt.buf,
                                    ctlbufp->buf + pptr->conn_con.OPT_offset,
                                    (size_t)pptr->conn_con.OPT_length);
                                call->opt.len = pptr->conn_con.OPT_length;
                        }
                        if (_T_IS_TLI(api_semantics) ||
                            call->udata.maxlen > 0) {
                                if (databuf.len > (int)call->udata.maxlen) {
                                        t_errno = TBUFOVFLW;
                                        goto err_out;
                                }
                                (void) memcpy(call->udata.buf, databuf.buf,
                                    (size_t)databuf.len);
                                call->udata.len = databuf.len;
                        }
                        /*
                         * since a confirmation seq number
                         * is -1 by default
                         */
                        call->sequence = (int)-1;
                }
                if (didralloc)
                        free(databuf.buf);
                else
                        tiptr->ti_rcvbuf = databuf.buf;
                return (0);

        case T_DISCON_IND:

                /*
                 * if disconnect indication then append it to
                 * the "look bufffer" list.
                 * This may result in MT case for the process
                 * signal mask to be temporarily masked to
                 * ensure safe memory allocation.
                 */

                if (_t_register_lookevent(tiptr, databuf.buf, databuf.len,
                                        ctlbufp->buf, ctlbufp->len) < 0) {
                        t_errno = TSYSERR;
                        errno = ENOMEM;
                        goto err_out;
                }
                t_errno = TLOOK;
                goto err_out;

        default:
                break;
        }

        t_errno = TSYSERR;
        errno = EPROTO;
err_out:
        if (didralloc)
                free(databuf.buf);
        else
                tiptr->ti_rcvbuf = databuf.buf;
        return (-1);
}