xref: /illumos-gate/usr/src/lib/libnsl/rpc/clnt_raw.c (revision 2a6fb28d0877f35efb94c09cc03e8088426d0c30)
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 /*
24  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
25  * Use is subject to license terms.
26  */
27 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
28 /* All Rights Reserved */
29 /*
30  * Portions of this source code were derived from Berkeley
31  * 4.3 BSD under license from the Regents of the University of
32  * California.
33  */
34 
35 /*
36  * clnt_raw.c
37  *
38  * Memory based rpc for simple testing and timing.
39  * Interface to create an rpc client and server in the same process.
40  * This lets us simulate rpc and get round trip overhead, without
41  * any interference from the kernel.
42  */
43 #include "mt.h"
44 #include "rpc_mt.h"
45 #include <stdlib.h>
46 #include <rpc/rpc.h>
47 #include <syslog.h>
48 
49 extern mutex_t	clntraw_lock;
50 #define	MCALL_MSG_SIZE 24
51 
52 /*
53  * This is the "network" we will be moving stuff over.
54  */
55 static struct clnt_raw_private {
56 	CLIENT	client_object;
57 	struct netbuf	*raw_netbuf;
58 	char	mashl_callmsg[MCALL_MSG_SIZE];
59 	uint_t	mcnt;
60 } *clnt_raw_private;
61 
62 static struct clnt_ops *clnt_raw_ops();
63 
64 extern bool_t xdr_opaque_auth();
65 
66 /*
67  * This netbuf is shared with the raw server.
68  */
69 extern struct netbuf _rawcomnetbuf;
70 
71 /*
72  * Create a client handle for memory based rpc.
73  */
74 CLIENT *
clnt_raw_create(const rpcprog_t prog,const rpcvers_t vers)75 clnt_raw_create(const rpcprog_t prog, const rpcvers_t vers)
76 {
77 	struct clnt_raw_private *clp;
78 	struct rpc_msg call_msg;
79 	XDR xdrs;
80 	CLIENT *client;
81 	uint_t start;
82 
83 /* VARIABLES PROTECTED BY clntraw_lock: clp */
84 
85 	(void) mutex_lock(&clntraw_lock);
86 	clp = clnt_raw_private;
87 	if (clp != NULL) {
88 		(void) mutex_unlock(&clntraw_lock);
89 		return (&clp->client_object);
90 	}
91 
92 	clp = calloc(1, sizeof (*clp));
93 	if (clp == NULL) {
94 		(void) mutex_unlock(&clntraw_lock);
95 		return (NULL);
96 	}
97 
98 	clp->raw_netbuf = &_rawcomnetbuf;
99 
100 	/*
101 	 * pre-serialize the static part of the call msg and stash it away
102 	 */
103 	call_msg.rm_direction = CALL;
104 	call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
105 	call_msg.rm_call.cb_prog = prog;
106 	call_msg.rm_call.cb_vers = vers;
107 
108 	xdrmem_create(&xdrs, clp->mashl_callmsg, sizeof (clp->mashl_callmsg),
109 	    XDR_ENCODE);
110 	start = XDR_GETPOS(&xdrs);
111 	if (!xdr_callhdr(&xdrs, &call_msg)) {
112 		free(clp);
113 		(void) syslog(LOG_ERR,
114 		    "clnt_raw_create: Fatal header serialization error");
115 
116 		(void) mutex_unlock(&clntraw_lock);
117 		return (NULL);
118 	}
119 	clp->mcnt = XDR_GETPOS(&xdrs) - start;
120 	XDR_DESTROY(&xdrs);
121 
122 	/*
123 	 * create client handle
124 	 */
125 	client = &clp->client_object;
126 	client->cl_ops = clnt_raw_ops();
127 	client->cl_auth = authnone_create();
128 
129 	clnt_raw_private = clp;
130 
131 	(void) mutex_unlock(&clntraw_lock);
132 	return (client);
133 }
134 
135 /*ARGSUSED*/
136 static enum clnt_stat
clnt_raw_call(CLIENT * h,rpcproc_t proc,xdrproc_t xargs,caddr_t argsp,xdrproc_t xresults,caddr_t resultsp,struct timeval timeout)137 clnt_raw_call(CLIENT *h, rpcproc_t proc, xdrproc_t xargs, caddr_t argsp,
138     xdrproc_t xresults, caddr_t resultsp, struct timeval timeout)
139 {
140 	struct clnt_raw_private *clp;
141 	XDR xdrs;
142 	struct rpc_msg msg;
143 	uint_t start;
144 
145 	rpc_callerr.re_errno = 0;
146 	rpc_callerr.re_terrno = 0;
147 
148 	(void) mutex_lock(&clntraw_lock);
149 	clp = clnt_raw_private;
150 	if (clp == NULL) {
151 		(void) mutex_unlock(&clntraw_lock);
152 		return (rpc_callerr.re_status = RPC_FAILED);
153 	}
154 	(void) mutex_unlock(&clntraw_lock);
155 
156 call_again:
157 	/*
158 	 * send request
159 	 */
160 	xdrmem_create(&xdrs, clp->raw_netbuf->buf, clp->raw_netbuf->maxlen,
161 	    XDR_ENCODE);
162 	start = XDR_GETPOS(&xdrs);
163 /* LINTED pointer alignment */
164 	((struct rpc_msg *)clp->mashl_callmsg)->rm_xid++;
165 	if ((!XDR_PUTBYTES(&xdrs, clp->mashl_callmsg, clp->mcnt)) ||
166 	    (!XDR_PUTINT32(&xdrs, (int32_t *)&proc)) ||
167 	    (!AUTH_MARSHALL(h->cl_auth, &xdrs)) ||
168 	    (!(*xargs)(&xdrs, argsp))) {
169 		XDR_DESTROY(&xdrs);
170 		return (rpc_callerr.re_status = RPC_CANTENCODEARGS);
171 	}
172 	clp->raw_netbuf->len = XDR_GETPOS(&xdrs) - start;
173 	XDR_DESTROY(&xdrs);
174 
175 	/*
176 	 * We have to call server input routine here because this is
177 	 * all going on in one process.
178 	 * By convention using FD_SETSIZE as the pseudo file descriptor.
179 	 */
180 	svc_getreq_common(FD_SETSIZE);
181 
182 	/*
183 	 * get results
184 	 */
185 	xdrmem_create(&xdrs, clp->raw_netbuf->buf, clp->raw_netbuf->len,
186 	    XDR_DECODE);
187 	msg.acpted_rply.ar_verf = _null_auth;
188 	msg.acpted_rply.ar_results.where = resultsp;
189 	msg.acpted_rply.ar_results.proc = xresults;
190 	if (!xdr_replymsg(&xdrs, &msg)) {
191 		XDR_DESTROY(&xdrs);
192 		return (rpc_callerr.re_status = RPC_CANTDECODERES);
193 	}
194 	XDR_DESTROY(&xdrs);
195 	if ((msg.rm_reply.rp_stat == MSG_ACCEPTED) &&
196 	    (msg.acpted_rply.ar_stat == SUCCESS))
197 		rpc_callerr.re_status = RPC_SUCCESS;
198 	else
199 		__seterr_reply(&msg, &rpc_callerr);
200 
201 	if (rpc_callerr.re_status == RPC_SUCCESS) {
202 		if (!AUTH_VALIDATE(h->cl_auth, &msg.acpted_rply.ar_verf)) {
203 			rpc_callerr.re_status = RPC_AUTHERROR;
204 			rpc_callerr.re_why = AUTH_INVALIDRESP;
205 		}
206 		if (msg.acpted_rply.ar_verf.oa_base != NULL) {
207 			xdr_free(xdr_opaque_auth,
208 			    (char *)&(msg.acpted_rply.ar_verf));
209 		}
210 		/* end successful completion */
211 	} else {
212 		if (AUTH_REFRESH(h->cl_auth, &msg))
213 			goto call_again;
214 		/* end of unsuccessful completion */
215 	}
216 
217 	return (rpc_callerr.re_status);
218 }
219 
220 /*ARGSUSED*/
221 static enum clnt_stat
clnt_raw_send(CLIENT * h,rpcproc_t proc,xdrproc_t xargs,caddr_t argsp)222 clnt_raw_send(CLIENT *h, rpcproc_t proc, xdrproc_t xargs, caddr_t argsp)
223 {
224 	struct clnt_raw_private *clp;
225 	XDR xdrs;
226 	uint_t start;
227 
228 	rpc_callerr.re_errno = 0;
229 	rpc_callerr.re_terrno = 0;
230 
231 	(void) mutex_lock(&clntraw_lock);
232 	clp = clnt_raw_private;
233 	if (clp == NULL) {
234 		(void) mutex_unlock(&clntraw_lock);
235 		return (rpc_callerr.re_status = RPC_FAILED);
236 	}
237 	(void) mutex_unlock(&clntraw_lock);
238 
239 	/*
240 	 * send request
241 	 */
242 	xdrmem_create(&xdrs, clp->raw_netbuf->buf, clp->raw_netbuf->maxlen,
243 	    XDR_ENCODE);
244 	start = XDR_GETPOS(&xdrs);
245 /* LINTED pointer alignment */
246 	((struct rpc_msg *)clp->mashl_callmsg)->rm_xid++;
247 	if ((!XDR_PUTBYTES(&xdrs, clp->mashl_callmsg, clp->mcnt)) ||
248 	    (!XDR_PUTINT32(&xdrs, (int32_t *)&proc)) ||
249 	    (!AUTH_MARSHALL(h->cl_auth, &xdrs)) ||
250 	    (!(*xargs)(&xdrs, argsp))) {
251 		XDR_DESTROY(&xdrs);
252 		return (rpc_callerr.re_status = RPC_CANTENCODEARGS);
253 	}
254 	clp->raw_netbuf->len = XDR_GETPOS(&xdrs) - start;
255 	XDR_DESTROY(&xdrs);
256 
257 	/*
258 	 * We have to call server input routine here because this is
259 	 * all going on in one process.
260 	 * By convention using FD_SETSIZE as the pseudo file descriptor.
261 	 */
262 	svc_getreq_common(FD_SETSIZE);
263 
264 	return (rpc_callerr.re_status = RPC_SUCCESS);
265 }
266 
267 /*ARGSUSED*/
268 static void
clnt_raw_geterr(CLIENT * cl,struct rpc_err * errp)269 clnt_raw_geterr(CLIENT *cl, struct rpc_err *errp)
270 {
271 	*errp = rpc_callerr;
272 }
273 
274 /*ARGSUSED*/
275 static bool_t
clnt_raw_freeres(CLIENT * cl,xdrproc_t xdr_res,caddr_t res_ptr)276 clnt_raw_freeres(CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr)
277 {
278 	struct clnt_raw_private *clp;
279 
280 	(void) mutex_lock(&clntraw_lock);
281 	clp = clnt_raw_private;
282 	if (clp == NULL) {
283 		(void) mutex_unlock(&clntraw_lock);
284 		return (FALSE);
285 	}
286 	(void) mutex_unlock(&clntraw_lock);
287 
288 	xdr_free(xdr_res, res_ptr);
289 
290 	return (TRUE);
291 }
292 
293 /*ARGSUSED*/
294 static void
clnt_raw_abort(CLIENT * cl,struct rpc_err * errp)295 clnt_raw_abort(CLIENT *cl, struct rpc_err *errp)
296 {
297 }
298 
299 /*ARGSUSED*/
300 static bool_t
clnt_raw_control(CLIENT * cl,int request,char * info)301 clnt_raw_control(CLIENT *cl, int request, char *info)
302 {
303 	return (FALSE);
304 }
305 
306 /*ARGSUSED*/
307 static void
clnt_raw_destroy(CLIENT * cl)308 clnt_raw_destroy(CLIENT *cl)
309 {
310 }
311 
312 static struct clnt_ops *
clnt_raw_ops(void)313 clnt_raw_ops(void)
314 {
315 	static struct clnt_ops ops;
316 	extern mutex_t	ops_lock;
317 
318 	/* VARIABLES PROTECTED BY ops_lock: ops */
319 
320 	(void) mutex_lock(&ops_lock);
321 	if (ops.cl_call == NULL) {
322 		ops.cl_call = clnt_raw_call;
323 		ops.cl_send = clnt_raw_send;
324 		ops.cl_abort = clnt_raw_abort;
325 		ops.cl_geterr = clnt_raw_geterr;
326 		ops.cl_freeres = clnt_raw_freeres;
327 		ops.cl_destroy = clnt_raw_destroy;
328 		ops.cl_control = clnt_raw_control;
329 	}
330 	(void) mutex_unlock(&ops_lock);
331 	return (&ops);
332 }
333