usr/src/lib/libc/port/nsl/t_rcvdis.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22
  23 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  24 /*        All Rights Reserved   */
  25
  26 /*
  27  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30
  31 #pragma ident   "%Z%%M% %I%     %E% SMI"        /* SVr4.0 1.10 */
  32
  33 #include "mt.h"
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <errno.h>
  37 #include <stropts.h>
  38 #include <sys/stream.h>
  39 #define _SUN_TPI_VERSION 2
  40 #include <sys/tihdr.h>
  41 #include <sys/timod.h>
  42 #include <xti.h>
  43 #include <signal.h>
  44 #include <syslog.h>
  45 #include "tx.h"
  46
  47 int
  48 _tx_rcvdis(int fd, struct t_discon *discon, int api_semantics)
  49 {
  50         struct strbuf ctlbuf;
  51         struct strbuf databuf;
  52         int retval;
  53         union T_primitives *pptr;
  54         struct _ti_user *tiptr;
  55         int sv_errno;
  56         int flg = 0;
  57         int didalloc, didralloc;
  58         int use_lookbufs = 0;
  59
  60         if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
  61                 return (-1);
  62
  63         /*
  64          * Acquire per thread lock.
  65          * Note: Lock is held across most of this routine
  66          * including the blocking getmsg() call. This is fine
  67          * because it is first verfied that an event is pending
  68          */
  69         sig_mutex_lock(&tiptr->ti_lock);
  70
  71         if (tiptr->ti_servtype == T_CLTS) {
  72                 t_errno = TNOTSUPPORT;
  73                 sig_mutex_unlock(&tiptr->ti_lock);
  74                 return (-1);
  75         }
  76
  77         if (_T_IS_XTI(api_semantics)) {
  78                 /*
  79                  * User level state verification only done for XTI
  80                  * because doing for TLI may break existing applications
  81                  */
  82                 if (!(tiptr->ti_state == T_DATAXFER ||
  83                     tiptr->ti_state == T_OUTCON ||
  84                     tiptr->ti_state == T_OUTREL ||
  85                     tiptr->ti_state == T_INREL ||
  86                     (tiptr->ti_state == T_INCON && tiptr->ti_ocnt > 0))) {
  87                         t_errno = TOUTSTATE;
  88                         sig_mutex_unlock(&tiptr->ti_lock);
  89                         return (-1);
  90                 }
  91         }
  92         /*
  93          * Handle likely scenario as special case:
  94          * Is there a discon in look buffer as the first
  95          * event in the lookbuffer, is so just get it.
  96          */
  97         if ((tiptr->ti_lookcnt > 0) &&
  98             /* LINTED pointer cast */
  99             (*((t_scalar_t *)tiptr->ti_lookbufs.tl_lookcbuf) == T_DISCON_IND)) {
 100                 /*
 101                  * The T_DISCON_IND is already in the look buffer
 102                  */
 103                 ctlbuf.len = tiptr->ti_lookbufs.tl_lookclen;
 104                 ctlbuf.buf = tiptr->ti_lookbufs.tl_lookcbuf;
 105                 /* Note: ctlbuf.maxlen not used in this case */
 106
 107                 databuf.len = tiptr->ti_lookbufs.tl_lookdlen;
 108                 databuf.buf = tiptr->ti_lookbufs.tl_lookdbuf;
 109                 /* Note databuf.maxlen not used in this case */
 110
 111                 use_lookbufs = 1;
 112
 113         } else {
 114
 115                 if ((retval = _t_look_locked(fd, tiptr, 0,
 116                     api_semantics)) < 0) {
 117                         sv_errno = errno;
 118                         sig_mutex_unlock(&tiptr->ti_lock);
 119                         errno = sv_errno;
 120                         return (-1);
 121                 }
 122
 123                 if (retval != T_DISCONNECT) {
 124                         t_errno = TNODIS;
 125                         sig_mutex_unlock(&tiptr->ti_lock);
 126                         return (-1);
 127                 }
 128
 129                 /*
 130                  * get disconnect off read queue.
 131                  * use ctl and rcv buffers
 132                  *
 133                  * Acquire ctlbuf for use in sending/receiving control part
 134                  * of the message.
 135                  */
 136                 if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
 137                         sv_errno = errno;
 138                         sig_mutex_unlock(&tiptr->ti_lock);
 139                         errno = sv_errno;
 140                         return (-1);
 141                 }
 142
 143                 /*
 144                  * Acquire databuf for use in sending/receiving data part
 145                  */
 146                 if (_t_acquire_databuf(tiptr, &databuf, &didralloc) < 0) {
 147                         sv_errno = errno;
 148                         if (didalloc)
 149                                 free(ctlbuf.buf);
 150                         else
 151                                 tiptr->ti_ctlbuf = ctlbuf.buf;
 152                         sig_mutex_unlock(&tiptr->ti_lock);
 153                         errno = sv_errno;
 154                         return (-1);
 155                 }
 156
 157                 /*
 158                  * Since we already verified that a disconnect event
 159                  * is present, we assume that this getmsg() cannot
 160                  * block indefinitely
 161                  */
 162                 do {
 163                         retval = getmsg(fd, &ctlbuf, &databuf, &flg);
 164                 } while (retval < 0 && errno == EINTR);
 165
 166                 if (retval  < 0) {
 167                         t_errno = TSYSERR;
 168                         goto err_out;
 169                 }
 170                 if (databuf.len == -1) databuf.len = 0;
 171
 172                 /*
 173                  * did I get entire message?
 174                  */
 175                 if (retval > 0) {
 176                         t_errno = TSYSERR;
 177                         errno = EIO;
 178                         goto err_out;
 179                 }
 180         }
 181
 182
 183         /* LINTED pointer cast */
 184         pptr = (union T_primitives *)ctlbuf.buf;
 185
 186         if ((ctlbuf.len < (int)sizeof (struct T_discon_ind)) ||
 187             (pptr->type != T_DISCON_IND)) {
 188                 t_errno = TSYSERR;
 189                 errno = EPROTO;
 190                 goto err_out;
 191         }
 192
 193         /*
 194          * clear more and expedited flags
 195          */
 196         tiptr->ti_flags &= ~(MORE | EXPEDITED);
 197
 198         if (tiptr->ti_ocnt <= 0) {
 199                 _T_TX_NEXTSTATE(T_RCVDIS1, tiptr,
 200                                 "t_rcvdis: invalid state event T_RCVDIS1");
 201         } else {
 202                 if (tiptr->ti_ocnt == 1) {
 203                         _T_TX_NEXTSTATE(T_RCVDIS2, tiptr,
 204                                 "t_rcvdis: invalid state event T_RCVDIS2");
 205                 } else {
 206                         _T_TX_NEXTSTATE(T_RCVDIS3, tiptr,
 207                                 "t_rcvdis: invalid state event T_RCVDIS3");
 208                 }
 209                 tiptr->ti_ocnt--;
 210                 tiptr->ti_flags &= ~TX_TQFULL_NOTIFIED;
 211         }
 212
 213         if (discon != NULL) {
 214                 if (_T_IS_TLI(api_semantics) || discon->udata.maxlen > 0) {
 215                         if (databuf.len > (int)discon->udata.maxlen) {
 216                                 t_errno = TBUFOVFLW;
 217                                 goto err_out;
 218                         }
 219                         (void) memcpy(discon->udata.buf, databuf.buf,
 220                             (size_t)databuf.len);
 221                         discon->udata.len = databuf.len;
 222                 }
 223                 discon->reason = pptr->discon_ind.DISCON_reason;
 224                 discon->sequence = pptr->discon_ind.SEQ_number;
 225         }
 226         if (use_lookbufs)
 227                 _t_free_looklist_head(tiptr);
 228         else {
 229                 if (didalloc)
 230                         free(ctlbuf.buf);
 231                 else
 232                         tiptr->ti_ctlbuf = ctlbuf.buf;
 233                 if (didralloc)
 234                         free(databuf.buf);
 235                 else
 236                         tiptr->ti_rcvbuf = databuf.buf;
 237         }
 238         sig_mutex_unlock(&tiptr->ti_lock);
 239         return (0);
 240
 241 err_out:
 242         sv_errno = errno;
 243
 244         if (use_lookbufs)
 245                 _t_free_looklist_head(tiptr);
 246         else {
 247                 if (didalloc)
 248                         free(ctlbuf.buf);
 249                 else
 250                         tiptr->ti_ctlbuf = ctlbuf.buf;
 251                 if (didralloc)
 252                         free(databuf.buf);
 253                 else
 254                         tiptr->ti_rcvbuf = databuf.buf;
 255         }
 256         sig_mutex_unlock(&tiptr->ti_lock);
 257         errno = sv_errno;
 258         return (-1);
 259 }