usr/src/lib/libc/port/nsl/t_connect.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 2006 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 1.7 */
  32
  33 #include "mt.h"
  34 #include <stropts.h>
  35 #include <stdlib.h>
  36 #include <sys/timod.h>
  37 #define _SUN_TPI_VERSION 2
  38 #include <sys/tihdr.h>
  39 #include <xti.h>
  40 #include <fcntl.h>
  41 #include <signal.h>
  42 #include <errno.h>
  43 #include <syslog.h>
  44 #include "tx.h"
  45
  46 /*
  47  * If a system call fails with EINTR after T_CONN_REQ is sent out,
  48  * we change state for caller to continue with t_rcvconnect(). This
  49  * semantics is not documented for TLI but is the direction taken with
  50  * XTI so we adopt it. With this the call establishment is completed
  51  * by calling t_rcvconnect() even for synchronous endpoints.
  52  */
  53 int
  54 _tx_connect(
  55         int fd,
  56         const struct t_call *sndcall,
  57         struct t_call *rcvcall,
  58         int api_semantics
  59 )
  60 {
  61         int fctlflg;
  62         struct _ti_user *tiptr;
  63         sigset_t mask;
  64         struct strbuf ctlbuf;
  65         int sv_errno;
  66         int didalloc;
  67
  68         if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == NULL)
  69                 return (-1);
  70
  71         sig_mutex_lock(&tiptr->ti_lock);
  72         if (_T_IS_XTI(api_semantics)) {
  73                 /*
  74                  * User level state verification only done for XTI
  75                  * because doing for TLI may break existing applications
  76                  */
  77                 if (tiptr->ti_state != T_IDLE) {
  78                         t_errno = TOUTSTATE;
  79                         sig_mutex_unlock(&tiptr->ti_lock);
  80                         return (-1);
  81                 }
  82         }
  83
  84         /*
  85          * Acquire ctlbuf for use in sending/receiving control part
  86          * of the message.
  87          */
  88         if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
  89                 sv_errno = errno;
  90                 sig_mutex_unlock(&tiptr->ti_lock);
  91                 errno = sv_errno;
  92                 return (-1);
  93         }
  94         /*
  95          * Block all signals until T_CONN_REQ sent and
  96          * acked with T_OK_ACK/ERROR_ACK
  97          */
  98         (void) thr_sigsetmask(SIG_SETMASK, &fillset, &mask);
  99         if (_t_snd_conn_req(tiptr, sndcall, &ctlbuf) < 0) {
 100                 sv_errno = errno;
 101                 (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
 102                 errno = sv_errno;
 103                 /*
 104                  * At the TPI level, the error returned in a T_ERROR_ACK
 105                  * received in response to a T_CONN_REQ for an attempt to
 106                  * establish a duplicate conection has changed to a
 107                  * new t_errno code introduced with XTI (ADDRBUSY).
 108                  * We need to adjust TLI error code to be same as before.
 109                  */
 110                 if (_T_IS_TLI(api_semantics) && t_errno == TADDRBUSY)
 111                         /* TLI only */
 112                         t_errno = TBADADDR;
 113
 114                 goto err_out;
 115         }
 116         (void) thr_sigsetmask(SIG_SETMASK, &mask, NULL);
 117
 118         if ((fctlflg = fcntl(fd, F_GETFL, 0)) < 0) {
 119                 t_errno = TSYSERR;
 120                 goto err_out;
 121         }
 122
 123         if (fctlflg & (O_NDELAY | O_NONBLOCK)) {
 124                 _T_TX_NEXTSTATE(T_CONNECT2, tiptr,
 125                                 "t_connect: invalid state event T_CONNECT2");
 126                 t_errno = TNODATA;
 127                 goto err_out;
 128         }
 129
 130         /*
 131          * Note: The following call to _t_rcv_conn_con blocks awaiting
 132          * T_CONN_CON from remote client. Therefore it drops the
 133          * tiptr->lock during the call (and reacquires it)
 134          */
 135         if (_t_rcv_conn_con(tiptr, rcvcall, &ctlbuf, api_semantics) < 0) {
 136                 if ((t_errno == TSYSERR && errno == EINTR) ||
 137                     t_errno == TLOOK) {
 138                         _T_TX_NEXTSTATE(T_CONNECT2, tiptr,
 139                                 "t_connect: invalid state event T_CONNECT2");
 140                 } else if (t_errno == TBUFOVFLW) {
 141                         _T_TX_NEXTSTATE(T_CONNECT1, tiptr,
 142                                 "t_connect: invalid state event T_CONNECT1");
 143                 }
 144                 goto err_out;
 145         }
 146         _T_TX_NEXTSTATE(T_CONNECT1, tiptr,
 147                                 "t_connect: invalid state event T_CONNECT1");
 148         /*
 149          * Update attributes which may have been negotiated during
 150          * connection establishment for protocols where we suspect
 151          * such negotiation is likely (e.g. OSI). We do not do it for
 152          * all endpoints for performance reasons. Also, this code is
 153          * deliberately done after user level state changes so even
 154          * the (unlikely) failure case reflects a connected endpoint.
 155          */
 156         if (tiptr->ti_tsdusize != 0) {
 157                 if (_t_do_postconn_sync(fd, tiptr) < 0)
 158                     goto err_out;
 159         }
 160
 161
 162         if (didalloc)
 163                 free(ctlbuf.buf);
 164         else
 165                 tiptr->ti_ctlbuf = ctlbuf.buf;
 166         sig_mutex_unlock(&tiptr->ti_lock);
 167         return (0);
 168
 169 err_out:
 170         sv_errno = errno;
 171         if (didalloc)
 172                 free(ctlbuf.buf);
 173         else
 174                 tiptr->ti_ctlbuf = ctlbuf.buf;
 175         sig_mutex_unlock(&tiptr->ti_lock);
 176
 177         errno = sv_errno;
 178         return (-1);
 179 }