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 /*
32 * t_rcvrel.c and t_rcvreldata.c are very similar and contain common code.
33 * Any changes to either of them should be reviewed to see whether they
34 * are applicable to the other file.
35 */
36 #include "mt.h"
37 #include <stdlib.h>
38 #include <errno.h>
39 #include <stropts.h>
40 #include <sys/stream.h>
41 #define _SUN_TPI_VERSION 2
42 #include <sys/tihdr.h>
43 #include <sys/timod.h>
44 #include <xti.h>
45 #include <signal.h>
46 #include <syslog.h>
47 #include "tx.h"
48
49 int
_tx_rcvrel(int fd,int api_semantics)50 _tx_rcvrel(int fd, int api_semantics)
51 {
52 struct strbuf ctlbuf;
53 struct strbuf databuf;
54 int retval;
55 union T_primitives *pptr;
56 struct _ti_user *tiptr;
57 int sv_errno;
58 int didalloc, didralloc;
59
60 int flg = 0;
61
62 if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == 0)
63 return (-1);
64 sig_mutex_lock(&tiptr->ti_lock);
65
66 if (tiptr->ti_servtype != T_COTS_ORD) {
67 t_errno = TNOTSUPPORT;
68 sig_mutex_unlock(&tiptr->ti_lock);
69 return (-1);
70 }
71
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_DATAXFER ||
78 tiptr->ti_state == T_OUTREL)) {
79 t_errno = TOUTSTATE;
80 sig_mutex_unlock(&tiptr->ti_lock);
81 return (-1);
82 }
83 }
84
85 if ((retval = _t_look_locked(fd, tiptr, 0, api_semantics)) < 0) {
86 sv_errno = errno;
87 sig_mutex_unlock(&tiptr->ti_lock);
88 errno = sv_errno;
89 return (-1);
90 }
91
92 if (retval == T_DISCONNECT) {
93 /*
94 * This ensures preference to T_DISCON_IND which is
95 * the design model for TPI
96 */
97 t_errno = TLOOK;
98 sig_mutex_unlock(&tiptr->ti_lock);
99 return (-1);
100 }
101
102 if ((tiptr->ti_lookcnt > 0) &&
103 /* LINTED pointer cast */
104 (*((t_scalar_t *)tiptr->ti_lookbufs.tl_lookcbuf) == T_ORDREL_IND)) {
105 /*
106 * Current look buffer event is T_ORDREL_IND.
107 * Remove it from look buffer event list.
108 */
109 _t_free_looklist_head(tiptr);
110 _T_TX_NEXTSTATE(T_RCVREL, tiptr,
111 "t_rcv: invalid state event T_RCVREL");
112 sig_mutex_unlock(&tiptr->ti_lock);
113 return (0);
114 } else {
115 if (retval != T_ORDREL) {
116 t_errno = TNOREL;
117 sig_mutex_unlock(&tiptr->ti_lock);
118 return (-1);
119 }
120 }
121
122 /*
123 * get ordrel off read queue.
124 * use ctl and rcv buffers
125 *
126 * Acquire ctlbuf for use in sending/receiving control part
127 * of the message.
128 */
129 if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
130 sv_errno = errno;
131 sig_mutex_unlock(&tiptr->ti_lock);
132 errno = sv_errno;
133 return (-1);
134 }
135
136 /*
137 * Acquire databuf for use in sending/receiving data part
138 */
139 if (_t_acquire_databuf(tiptr, &databuf, &didralloc) < 0) {
140 sv_errno = errno;
141 if (didalloc)
142 free(ctlbuf.buf);
143 else
144 tiptr->ti_ctlbuf = ctlbuf.buf;
145 sig_mutex_unlock(&tiptr->ti_lock);
146 errno = sv_errno;
147 return (-1);
148 }
149
150 /*
151 * Since we have verified above that an orderly release event
152 * is pending on this endpoint, we assume that this getmsg()
153 * cannot block forever.
154 */
155 do {
156 retval = getmsg(fd, &ctlbuf, &databuf, &flg);
157 } while (retval < 0 && errno == EINTR);
158
159 if (retval < 0) {
160 t_errno = TSYSERR;
161 goto err_out;
162 }
163
164 /*
165 * did I get entire message?
166 */
167 if (retval > 0) {
168 t_errno = TSYSERR;
169 errno = EIO;
170 goto err_out;
171 }
172 /* LINTED pointer cast */
173 pptr = (union T_primitives *)ctlbuf.buf;
174
175 if (ctlbuf.len < (int)sizeof (struct T_ordrel_ind)) {
176 t_errno = TSYSERR;
177 errno = EPROTO;
178 goto err_out;
179 }
180 if (pptr->type != T_ORDREL_IND) {
181 if (pptr->type == T_DISCON_IND) {
182 /*
183 * T_DISCON_IND gets priority following
184 * TPI design philosphy.
185 *
186 * Add it to the events in the "look buffer"
187 * list of events. This routine may defer signals.
188 */
189 if (_t_register_lookevent(tiptr, databuf.buf,
190 databuf.len, ctlbuf.buf,
191 ctlbuf.len) < 0) {
192 t_errno = TSYSERR;
193 errno = ENOMEM;
194 goto err_out;
195 }
196 t_errno = TLOOK;
197 goto err_out;
198 } else {
199 t_errno = TSYSERR;
200 errno = EPROTO;
201 goto err_out;
202 }
203 }
204
205 _T_TX_NEXTSTATE(T_RCVREL, tiptr,
206 "t_rcvrel: invalid state event T_RCVREL");
207
208 if (didalloc)
209 free(ctlbuf.buf);
210 else
211 tiptr->ti_ctlbuf = ctlbuf.buf;
212 if (didralloc)
213 free(databuf.buf);
214 else
215 tiptr->ti_rcvbuf = databuf.buf;
216 sig_mutex_unlock(&tiptr->ti_lock);
217 return (0);
218
219 err_out:
220 sv_errno = errno;
221
222 if (didalloc)
223 free(ctlbuf.buf);
224 else
225 tiptr->ti_ctlbuf = ctlbuf.buf;
226 if (didralloc)
227 free(databuf.buf);
228 else
229 tiptr->ti_rcvbuf = databuf.buf;
230 sig_mutex_unlock(&tiptr->ti_lock);
231 errno = sv_errno;
232 return (-1);
233 }
234