OpenSolaris_b135/lib/libnsl/nsl/t_rcvudata.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 */
/*
* t_rcvudata.c and t_rcvvudata.c are very similar and contain common code.
* Any changes to either of them should be reviewed to see whether they
* are applicable to the other file.
*/
#include "mt.h"
#include <string.h>
#include <stdlib.h>
#include <errno.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 "tx.h"
int
_tx_rcvudata(
int fd,
struct t_unitdata *unitdata,
int *flags,
int api_semantics
)
{
struct strbuf ctlbuf;
int retval;
union T_primitives *pptr;
struct _ti_user *tiptr;
int sv_errno;
int didalloc;
int flg = 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);
}
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);
}
}
/*
* check if there is something in look buffer
*/
if (tiptr->ti_lookcnt > 0) {
sig_mutex_unlock(&tiptr->ti_lock);
t_errno = TLOOK;
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);
}
*flags = 0;
/*
* 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, &ctlbuf, (struct strbuf *)&unitdata->udata,
&flg)) < 0) {
if (errno == EAGAIN)
t_errno = TNODATA;
else
t_errno = TSYSERR;
sv_errno = errno;
sig_mutex_lock(&tiptr->ti_lock);
errno = sv_errno;
goto err_out;
}
sig_mutex_lock(&tiptr->ti_lock);
if (((struct strbuf *)&unitdata->udata)->len == -1)
unitdata->udata.len = 0;
/*
* is there control piece with data?
*/
if (ctlbuf.len > 0) {
if (ctlbuf.len < (int)sizeof (t_scalar_t)) {
unitdata->udata.len = 0;
t_errno = TSYSERR;
errno = EPROTO;
goto err_out;
}
/* LINTED pointer cast */
pptr = (union T_primitives *)ctlbuf.buf;
switch (pptr->type) {
case T_UNITDATA_IND:
if ((ctlbuf.len <
(int)sizeof (struct T_unitdata_ind)) ||
(pptr->unitdata_ind.OPT_length &&
(ctlbuf.len < (int)(pptr->unitdata_ind.OPT_length
+ pptr->unitdata_ind.OPT_offset)))) {
t_errno = TSYSERR;
unitdata->udata.len = 0;
errno = EPROTO;
goto err_out;
}
if (_T_IS_TLI(api_semantics) ||
unitdata->addr.maxlen > 0) {
if (TLEN_GT_NLEN(pptr->unitdata_ind.SRC_length,
unitdata->addr.maxlen)) {
t_errno = TBUFOVFLW;
unitdata->udata.len = 0;
goto err_out;
}
(void) memcpy(unitdata->addr.buf,
ctlbuf.buf + pptr->unitdata_ind.SRC_offset,
(size_t)pptr->unitdata_ind.SRC_length);
unitdata->addr.len =
pptr->unitdata_ind.SRC_length;
}
if (_T_IS_TLI(api_semantics) ||
unitdata->opt.maxlen > 0) {
if (TLEN_GT_NLEN(pptr->unitdata_ind.OPT_length,
unitdata->opt.maxlen)) {
t_errno = TBUFOVFLW;
unitdata->udata.len = 0;
goto err_out;
}
(void) memcpy(unitdata->opt.buf, ctlbuf.buf +
pptr->unitdata_ind.OPT_offset,
(size_t)pptr->unitdata_ind.OPT_length);
unitdata->opt.len =
pptr->unitdata_ind.OPT_length;
}
if (retval & MOREDATA)
*flags |= T_MORE;
/*
* No state changes happens on T_RCVUDATA
* event (NOOP). We do it only to log errors.
*/
_T_TX_NEXTSTATE(T_RCVUDATA, tiptr,
"t_rcvudata: invalid state event T_RCVUDATA");
if (didalloc)
free(ctlbuf.buf);
else
tiptr->ti_ctlbuf = ctlbuf.buf;
sig_mutex_unlock(&tiptr->ti_lock);
return (0);
case T_UDERROR_IND:
if (_t_register_lookevent(tiptr, 0, 0, ctlbuf.buf,
ctlbuf.len) < 0) {
t_errno = TSYSERR;
errno = ENOMEM;
goto err_out;
}
unitdata->udata.len = 0;
t_errno = TLOOK;
goto err_out;
default:
break;
}
t_errno = TSYSERR;
errno = EPROTO;
goto err_out;
} else { /* else part of "if (ctlbuf.len > 0)" */
unitdata->addr.len = 0;
unitdata->opt.len = 0;
/*
* only data in message no control piece
*/
if (retval & MOREDATA)
*flags = T_MORE;
/*
* No state transition occurs on
* event T_RCVUDATA. We do it only to
* log errors.
*/
_T_TX_NEXTSTATE(T_RCVUDATA, tiptr,
"t_rcvudata: invalid state event T_RCVUDATA");
if (didalloc)
free(ctlbuf.buf);
else
tiptr->ti_ctlbuf = ctlbuf.buf;
sig_mutex_unlock(&tiptr->ti_lock);
return (0);
}
/* NOTREACHED */
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);
}