t_connect.c revision 1219:f89f56c2d9ac 
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 */
53int
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
169err_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}
180