usr/src/lib/libc/port/nsl/t_rcvuderr.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 #include "mt.h"
  34 #include <errno.h>
  35 #include <string.h>
  36 #include <stdlib.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 <syslog.h>
  44 #include <assert.h>
  45 #include "tx.h"
  46
  47 int
  48 _tx_rcvuderr(int fd, struct t_uderr *uderr, int api_semantics)
  49 {
  50         struct strbuf ctlbuf, databuf;
  51         int flg;
  52         int retval;
  53         union T_primitives *pptr;
  54         struct _ti_user *tiptr;
  55         int sv_errno;
  56         int didalloc;
  57         int use_lookbufs = 0;
  58
  59
  60         if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
  61                 return (-1);
  62         sig_mutex_lock(&tiptr->ti_lock);
  63
  64         if (tiptr->ti_servtype != T_CLTS) {
  65                 t_errno = TNOTSUPPORT;
  66                 sig_mutex_unlock(&tiptr->ti_lock);
  67                 return (-1);
  68         }
  69         /*
  70          * is there a unitdata error indication in look buffer
  71          */
  72         if (tiptr->ti_lookcnt > 0) {
  73                 ctlbuf.len = tiptr->ti_lookbufs.tl_lookclen;
  74                 ctlbuf.buf = tiptr->ti_lookbufs.tl_lookcbuf;
  75                 /* Note: cltbuf.maxlen not used in this case */
  76
  77                 /* LINTED pointer cast */
  78                 assert(((union T_primitives *)ctlbuf.buf)->type
  79                         == T_UDERROR_IND);
  80
  81                 databuf.maxlen = 0;
  82                 databuf.len = 0;
  83                 databuf.buf = NULL;
  84
  85                 use_lookbufs = 1;
  86
  87         } else {
  88                 if ((retval = _t_look_locked(fd, tiptr, 0,
  89                     api_semantics)) < 0) {
  90                         sv_errno = errno;
  91                         sig_mutex_unlock(&tiptr->ti_lock);
  92                         errno = sv_errno;
  93                         return (-1);
  94                 }
  95                 if (retval != T_UDERR) {
  96                         t_errno = TNOUDERR;
  97                         sig_mutex_unlock(&tiptr->ti_lock);
  98                         return (-1);
  99                 }
 100
 101                 /*
 102                  * Acquire ctlbuf for use in sending/receiving control part
 103                  * of the message.
 104                  */
 105                 if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
 106                         sv_errno = errno;
 107                         sig_mutex_unlock(&tiptr->ti_lock);
 108                         errno = sv_errno;
 109                         return (-1);
 110                 }
 111
 112                 databuf.maxlen = 0;
 113                 databuf.len = 0;
 114                 databuf.buf = NULL;
 115
 116                 flg = 0;
 117
 118                 /*
 119                  * Since we already verified that a unitdata error
 120                  * indication is pending, we assume that this getmsg()
 121                  * will not block indefinitely.
 122                  */
 123                 if ((retval = getmsg(fd, &ctlbuf, &databuf, &flg)) < 0) {
 124
 125                         t_errno = TSYSERR;
 126                         goto err_out;
 127                 }
 128                 /*
 129                  * did I get entire message?
 130                  */
 131                 if (retval > 0) {
 132                         t_errno = TSYSERR;
 133                         errno = EIO;
 134                         goto err_out;
 135                 }
 136
 137         }
 138
 139         /* LINTED pointer cast */
 140         pptr = (union T_primitives *)ctlbuf.buf;
 141
 142         if ((ctlbuf.len < (int)sizeof (struct T_uderror_ind)) ||
 143             (pptr->type != T_UDERROR_IND)) {
 144                 t_errno = TSYSERR;
 145                 errno = EPROTO;
 146                 goto err_out;
 147         }
 148
 149         if (uderr) {
 150                 if (_T_IS_TLI(api_semantics) || uderr->addr.maxlen > 0) {
 151                         if (TLEN_GT_NLEN(pptr->uderror_ind.DEST_length,
 152                             uderr->addr.maxlen)) {
 153                                 t_errno = TBUFOVFLW;
 154                                 goto err_out;
 155                         }
 156                         (void) memcpy(uderr->addr.buf, ctlbuf.buf +
 157                             pptr->uderror_ind.DEST_offset,
 158                             (size_t)pptr->uderror_ind.DEST_length);
 159                         uderr->addr.len =
 160                             (unsigned int)pptr->uderror_ind.DEST_length;
 161                 }
 162                 if (_T_IS_TLI(api_semantics) || uderr->addr.maxlen > 0) {
 163                         if (TLEN_GT_NLEN(pptr->uderror_ind.OPT_length,
 164                             uderr->opt.maxlen)) {
 165                                 t_errno = TBUFOVFLW;
 166                                 goto err_out;
 167                         }
 168                         (void) memcpy(uderr->opt.buf, ctlbuf.buf +
 169                             pptr->uderror_ind.OPT_offset,
 170                             (size_t)pptr->uderror_ind.OPT_length);
 171                         uderr->opt.len =
 172                             (unsigned int)pptr->uderror_ind.OPT_length;
 173                 }
 174                 uderr->error = pptr->uderror_ind.ERROR_type;
 175         }
 176
 177         _T_TX_NEXTSTATE(T_RCVUDERR, tiptr,
 178                         "t_rcvuderr: invalid state event T_RCVUDERR");
 179         if (use_lookbufs)
 180                 _t_free_looklist_head(tiptr);
 181         else {
 182                 if (didalloc)
 183                         free(ctlbuf.buf);
 184                 else
 185                         tiptr->ti_ctlbuf = ctlbuf.buf;
 186         }
 187         sig_mutex_unlock(&tiptr->ti_lock);
 188         return (0);
 189
 190 err_out:
 191         sv_errno = errno;
 192
 193         if (use_lookbufs)
 194                 _t_free_looklist_head(tiptr);
 195         else {
 196                 if (didalloc)
 197                         free(ctlbuf.buf);
 198                 else
 199                         tiptr->ti_ctlbuf = ctlbuf.buf;
 200         }
 201         sig_mutex_unlock(&tiptr->ti_lock);
 202         errno = sv_errno;
 203         return (-1);
 204 }