xref: /illumos-gate/usr/src/lib/libnsl/nsl/t_getname.c (revision 1da57d551424de5a9d469760be7c4b4d4f10a755)
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 #include "mt.h"
32 #include <stdlib.h>
33 #include <errno.h>
34 #include <unistd.h>
35 #include <string.h>
36 #include <stropts.h>
37 #include <sys/stream.h>
38 #include <xti.h>
39 #define	_SUN_TPI_VERSION 2
40 #include <sys/tihdr.h>
41 #include <sys/timod.h>
42 #include <assert.h>
43 #include <signal.h>
44 #include "tx.h"
45 
46 static int __tx_tlitpi_getprotaddr_locked(struct _ti_user *tiptr,
47 	struct t_bind *boundaddr, struct t_bind *peer);
48 
49 
50 static int __tx_getname_locked(int fd, struct netbuf *name, int type);
51 
52 int
_tx_getname(int fd,struct netbuf * name,int type,int api_semantics)53 _tx_getname(int fd, struct netbuf *name, int type, int api_semantics)
54 {
55 	struct _ti_user *tiptr;
56 	int retval, sv_errno;
57 
58 	assert(_T_IS_TLI(api_semantics)); /* TLI only interface */
59 	if (!name || ((type != LOCALNAME) && (type != REMOTENAME))) {
60 		errno = EINVAL;
61 		return (-1);
62 	}
63 
64 	if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == 0)
65 		return (-1);
66 	sig_mutex_lock(&tiptr->ti_lock);
67 
68 	retval = __tx_getname_locked(fd, name, type);
69 
70 	if (retval < 0) {
71 		sv_errno = errno;
72 		sig_mutex_unlock(&tiptr->ti_lock);
73 		errno = sv_errno;
74 		return (-1);
75 	}
76 
77 	sig_mutex_unlock(&tiptr->ti_lock);
78 
79 	return (0);
80 }
81 
82 
83 static int
__tx_getname_locked(int fd,struct netbuf * name,int type)84 __tx_getname_locked(int fd, struct netbuf *name, int type)
85 {
86 	int retval;
87 
88 	do {
89 		retval = ioctl(fd,
90 		    (type == LOCALNAME) ? TI_GETMYNAME : TI_GETPEERNAME, name);
91 	} while (retval < 0 && errno == EINTR);
92 
93 	if (retval < 0) {
94 		t_errno = TSYSERR;
95 		return (-1);
96 	}
97 	return (0);
98 }
99 
100 
101 
102 int
_tx_getprotaddr(int fd,struct t_bind * boundaddr,struct t_bind * peeraddr,int api_semantics)103 _tx_getprotaddr(
104 	int fd,
105 	struct t_bind *boundaddr,
106 	struct t_bind *peeraddr,
107 	int api_semantics)
108 {
109 	struct _ti_user *tiptr;
110 	int retval, sv_errno;
111 	struct T_addr_req *addreqp;
112 	struct T_addr_ack *addrackp;
113 	int didalloc;
114 	struct strbuf ctlbuf;
115 	int retlen;
116 
117 	if ((tiptr = _t_checkfd(fd, 0, api_semantics)) == 0)
118 		return (-1);
119 
120 	sig_mutex_lock(&tiptr->ti_lock);
121 
122 	if ((tiptr->ti_prov_flag & XPG4_1) == 0) {
123 		/*
124 		 * Provider does not support XTI inspired TPI so we
125 		 * try to do operation assuming TLI inspired TPI
126 		 */
127 		retval = __tx_tlitpi_getprotaddr_locked(tiptr, boundaddr,
128 			peeraddr);
129 		sv_errno = errno;
130 		sig_mutex_unlock(&tiptr->ti_lock);
131 		errno = sv_errno;
132 		return (retval);
133 	}
134 
135 	/*
136 	 * Acquire buffer for use in sending/receiving the message.
137 	 * Note: assumes (correctly) that ti_ctlsize is large enough
138 	 * to hold sizeof (struct T_addr_req/ack)
139 	 */
140 	if (_t_acquire_ctlbuf(tiptr, &ctlbuf, &didalloc) < 0) {
141 		sv_errno = errno;
142 		sig_mutex_unlock(&tiptr->ti_lock);
143 		errno = sv_errno;
144 		return (-1);
145 	}
146 
147 	/* LINTED pointer cast */
148 	addreqp = (struct T_addr_req *)ctlbuf.buf;
149 	addreqp->PRIM_type = T_ADDR_REQ;
150 
151 	do {
152 		retval = _t_do_ioctl(fd, ctlbuf.buf,
153 			(int)sizeof (struct T_addr_req), TI_GETADDRS, &retlen);
154 	} while (retval < 0 && errno == EINTR);
155 
156 	/* retval can now be either 0 or -1 */
157 	if (retval < 0) {
158 		sv_errno = errno;
159 		sig_mutex_unlock(&tiptr->ti_lock);
160 		errno = sv_errno;
161 		goto err_out;
162 	}
163 	sig_mutex_unlock(&tiptr->ti_lock);
164 
165 	if (retlen < (int)sizeof (struct T_addr_ack)) {
166 		t_errno = TSYSERR;
167 		errno = EIO;
168 		retval = -1;
169 		goto err_out;
170 	}
171 
172 	/* LINTED pointer cast */
173 	addrackp = (struct T_addr_ack *)ctlbuf.buf;
174 
175 	/*
176 	 * We assume null parameters are OK and not errors
177 	 */
178 	if (boundaddr != NULL && boundaddr->addr.maxlen > 0) {
179 		if (TLEN_GT_NLEN(addrackp->LOCADDR_length,
180 		    boundaddr->addr.maxlen)) {
181 			t_errno = TBUFOVFLW;
182 			retval = -1;
183 			goto err_out;
184 		}
185 		boundaddr->addr.len = addrackp->LOCADDR_length;
186 		(void) memcpy(boundaddr->addr.buf,
187 		    ctlbuf.buf + addrackp->LOCADDR_offset,
188 		    (size_t)addrackp->LOCADDR_length);
189 	}
190 
191 	/*
192 	 * Note: In states where there is no remote end of the connection
193 	 * the T_ADDR_REQ primitive does not return a remote address. However,
194 	 * in protcols such as TCP, the transport connection is established
195 	 * before the TLI/XTI level association is established. Therefore,
196 	 * in state T_OUTCON, the transport may return a remote address where
197 	 * TLI/XTI level thinks there is no remote end and therefore
198 	 * no remote address should be returned. We therefore do not look at
199 	 * address returned by transport provider in T_OUTCON state.
200 	 * Tested by XTI test suite.
201 	 */
202 	if (tiptr->ti_state != T_OUTCON &&
203 	    peeraddr != NULL && peeraddr->addr.maxlen > 0) {
204 		if (TLEN_GT_NLEN(addrackp->REMADDR_length,
205 		    peeraddr->addr.maxlen)) {
206 			t_errno = TBUFOVFLW;
207 			retval = -1;
208 			goto err_out;
209 		}
210 		peeraddr->addr.len = addrackp->REMADDR_length;
211 		(void) memcpy(peeraddr->addr.buf,
212 		    ctlbuf.buf + addrackp->REMADDR_offset,
213 		    (size_t)addrackp->REMADDR_length);
214 	}
215 
216 err_out:
217 	if (didalloc)
218 		free(ctlbuf.buf);
219 	else
220 		tiptr->ti_ctlbuf = ctlbuf.buf;
221 	return (retval);
222 }
223 
224 static int
__tx_tlitpi_getprotaddr_locked(struct _ti_user * tiptr,struct t_bind * boundaddr,struct t_bind * peeraddr)225 __tx_tlitpi_getprotaddr_locked(
226 	struct _ti_user *tiptr,
227 	struct t_bind *boundaddr,
228 	struct t_bind *peeraddr)
229 {
230 	if (boundaddr) {
231 		boundaddr->addr.len = 0;
232 		if (tiptr->ti_state >= TS_IDLE) {
233 			/*
234 			 * assume bound endpoint .
235 			 * Note: TI_GETMYNAME can return
236 			 * a finite length all zeroes address for unbound
237 			 * endpoint so we avoid relying on it for bound
238 			 * endpoints for XTI t_getprotaddr() semantics.
239 			 */
240 			if (__tx_getname_locked(tiptr->ti_fd, &boundaddr->addr,
241 			    LOCALNAME) < 0)
242 				return (-1);
243 
244 		}
245 	}
246 	if (peeraddr) {
247 
248 		peeraddr->addr.len = 0;
249 
250 		if (tiptr->ti_state >= TS_DATA_XFER) {
251 			/*
252 			 * assume connected endpoint.
253 			 * The TI_GETPEERNAME call can fail with error
254 			 * if endpoint is not connected so we don't call it
255 			 * for XTI t_getprotaddr() semantics
256 			 */
257 			if (__tx_getname_locked(tiptr->ti_fd, &peeraddr->addr,
258 			    REMOTENAME) < 0)
259 				return (-1);
260 		}
261 	}
262 	return (0);
263 }
264