usr/src/lib/libc/port/nsl/t_rcvudata.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 1.5 */
  32
  33 /*
  34  * t_rcvudata.c and t_rcvvudata.c are very similar and contain common code.
  35  * Any changes to either of them should be reviewed to see whether they
  36  * are applicable to the other file.
  37  */
  38 #include "mt.h"
  39 #include <string.h>
  40 #include <stdlib.h>
  41 #include <errno.h>
  42 #include <stropts.h>
  43 #include <sys/stream.h>
  44 #define _SUN_TPI_VERSION 2
  45 #include <sys/tihdr.h>
  46 #include <sys/timod.h>
  47 #include <xti.h>
  48 #include <syslog.h>
  49 #include "tx.h"
  50
  51
  52 int
  53 _tx_rcvudata(
  54         int fd,
  55         struct t_unitdata *unitdata,
  56         int *flags,
  57         int api_semantics
  58 )
  59 {
  60         struct strbuf ctlbuf;
  61         int retval;
  62         union T_primitives *pptr;
  63         struct _ti_user *tiptr;
  64         int sv_errno;
  65         int didalloc;
  66         int flg = 0;
  67
  68         if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
  69                 return (-1);
  70         sig_mutex_lock(&tiptr->ti_lock);
  71
  72         if (tiptr->ti_servtype != T_CLTS) {
  73                 t_errno = TNOTSUPPORT;
  74                 sig_mutex_unlock(&tiptr->ti_lock);
  75                 return (-1);
  76         }
  77
  78         if (_T_IS_XTI(api_semantics)) {
  79                 /*
  80                  * User level state verification only done for XTI
  81                  * because doing for TLI may break existing applications
  82                  */
  83                 if (tiptr->ti_state != T_IDLE) {
  84                         t_errno = TOUTSTATE;
  85                         sig_mutex_unlock(&tiptr->ti_lock);
  86                         return (-1);
  87                 }
  88         }
  89
  90
  91         /*
  92          * check if there is something in look buffer
  93          */
  94         if (tiptr->ti_lookcnt > 0) {
  95                 sig_mutex_unlock(&tiptr->ti_lock);
  96                 t_errno = TLOOK;
  97                 return (-1);
  98         }
  99
 100         /*
 101          * Acquire ctlbuf for use in sending/receiving control part
 102          * of the message.
 103          */
 104         if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
 105                 sv_errno = errno;
 106                 sig_mutex_unlock(&tiptr->ti_lock);
 107                 errno = sv_errno;
 108                 return (-1);
 109         }
 110
 111         *flags = 0;
 112
 113         /*
 114          * This is a call that may block indefinitely so we drop the
 115          * lock and allow signals in MT case here and reacquire it.
 116          * Error case should roll back state changes done above
 117          * (happens to be no state change here)
 118          */
 119         sig_mutex_unlock(&tiptr->ti_lock);
 120         if ((retval = getmsg(fd, &ctlbuf, (struct strbuf *)&unitdata->udata,
 121                                 &flg)) < 0) {
 122                 if (errno == EAGAIN)
 123                         t_errno = TNODATA;
 124                 else
 125                         t_errno = TSYSERR;
 126                 sv_errno = errno;
 127                 sig_mutex_lock(&tiptr->ti_lock);
 128                 errno = sv_errno;
 129                 goto err_out;
 130         }
 131         sig_mutex_lock(&tiptr->ti_lock);
 132
 133         if (((struct strbuf *)&unitdata->udata)->len == -1)
 134                 unitdata->udata.len = 0;
 135
 136         /*
 137          * is there control piece with data?
 138          */
 139         if (ctlbuf.len > 0) {
 140                 if (ctlbuf.len < (int)sizeof (t_scalar_t)) {
 141                         unitdata->udata.len = 0;
 142                         t_errno = TSYSERR;
 143                         errno = EPROTO;
 144                         goto err_out;
 145                 }
 146
 147                 /* LINTED pointer cast */
 148                 pptr = (union T_primitives *)ctlbuf.buf;
 149
 150                 switch (pptr->type) {
 151
 152                 case T_UNITDATA_IND:
 153                         if ((ctlbuf.len <
 154                             (int)sizeof (struct T_unitdata_ind)) ||
 155                             (pptr->unitdata_ind.OPT_length &&
 156                             (ctlbuf.len < (int)(pptr->unitdata_ind.OPT_length
 157                             + pptr->unitdata_ind.OPT_offset)))) {
 158                                 t_errno = TSYSERR;
 159                                 unitdata->udata.len = 0;
 160                                 errno = EPROTO;
 161                                 goto err_out;
 162                         }
 163
 164                         if (_T_IS_TLI(api_semantics) ||
 165                             unitdata->addr.maxlen > 0) {
 166                                 if (TLEN_GT_NLEN(pptr->unitdata_ind.SRC_length,
 167                                     unitdata->addr.maxlen)) {
 168                                         t_errno = TBUFOVFLW;
 169                                         unitdata->udata.len = 0;
 170                                         goto err_out;
 171                                 }
 172                                 (void) memcpy(unitdata->addr.buf,
 173                                     ctlbuf.buf + pptr->unitdata_ind.SRC_offset,
 174                                     (size_t)pptr->unitdata_ind.SRC_length);
 175                                 unitdata->addr.len =
 176                                     pptr->unitdata_ind.SRC_length;
 177                         }
 178                         if (_T_IS_TLI(api_semantics) ||
 179                             unitdata->opt.maxlen > 0) {
 180                                 if (TLEN_GT_NLEN(pptr->unitdata_ind.OPT_length,
 181                                     unitdata->opt.maxlen)) {
 182                                         t_errno = TBUFOVFLW;
 183                                         unitdata->udata.len = 0;
 184                                         goto err_out;
 185                                 }
 186                                 (void) memcpy(unitdata->opt.buf, ctlbuf.buf +
 187                                     pptr->unitdata_ind.OPT_offset,
 188                                     (size_t)pptr->unitdata_ind.OPT_length);
 189                                 unitdata->opt.len =
 190                                         pptr->unitdata_ind.OPT_length;
 191                         }
 192                         if (retval & MOREDATA)
 193                                 *flags |= T_MORE;
 194                         /*
 195                          * No state changes happens on T_RCVUDATA
 196                          * event (NOOP). We do it only to log errors.
 197                          */
 198                         _T_TX_NEXTSTATE(T_RCVUDATA, tiptr,
 199                             "t_rcvudata: invalid state event T_RCVUDATA");
 200
 201                         if (didalloc)
 202                                 free(ctlbuf.buf);
 203                         else
 204                                 tiptr->ti_ctlbuf = ctlbuf.buf;
 205
 206                         sig_mutex_unlock(&tiptr->ti_lock);
 207                         return (0);
 208
 209                 case T_UDERROR_IND:
 210                         if (_t_register_lookevent(tiptr, 0, 0, ctlbuf.buf,
 211                                 ctlbuf.len) < 0) {
 212                                 t_errno = TSYSERR;
 213                                 errno = ENOMEM;
 214                                 goto err_out;
 215                         }
 216                         unitdata->udata.len = 0;
 217                         t_errno = TLOOK;
 218                         goto err_out;
 219
 220                 default:
 221                         break;
 222                 }
 223
 224                 t_errno = TSYSERR;
 225                 errno = EPROTO;
 226                 goto err_out;
 227
 228         } else {                /* else part of "if (ctlbuf.len > 0)" */
 229                 unitdata->addr.len = 0;
 230                 unitdata->opt.len = 0;
 231                 /*
 232                  * only data in message no control piece
 233                  */
 234                 if (retval & MOREDATA)
 235                         *flags = T_MORE;
 236                 /*
 237                  * No state transition occurs on
 238                  * event T_RCVUDATA. We do it only to
 239                  * log errors.
 240                  */
 241                 _T_TX_NEXTSTATE(T_RCVUDATA, tiptr,
 242                     "t_rcvudata: invalid state event T_RCVUDATA");
 243                 if (didalloc)
 244                         free(ctlbuf.buf);
 245                 else
 246                         tiptr->ti_ctlbuf = ctlbuf.buf;
 247                 sig_mutex_unlock(&tiptr->ti_lock);
 248                 return (0);
 249         }
 250         /* NOTREACHED */
 251 err_out:
 252         sv_errno = errno;
 253         if (didalloc)
 254                 free(ctlbuf.buf);
 255         else
 256                 tiptr->ti_ctlbuf = ctlbuf.buf;
 257         sig_mutex_unlock(&tiptr->ti_lock);
 258         errno = sv_errno;
 259         return (-1);
 260 }